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Distributed version control | projects run automated test suite every pull request using continuous integration tool travis ci reviewer checks new code appropriate test coverage.history first opensource dvcs systems included arch monotone darcs.however open source dvcss never popular release git mercurial.bitkeeper used development linux kernel .development git worlds popular version control system prompted decision company made bitkeeper rescind free license linus torvalds linux kernel developers previously taken advantage of.see also references external links essay various revision control systems especially section centralized vs. decentralized scmintroduction distributed version control systems ibm developer works article |
Vehicle emissions control | types emissions emissions many air pollutants shown variety negative effects public health natural environment.emissions principal pollutants concern includehydrocarbons hc – class burned partially burned fuel hydrocarbons toxins.hydrocarbons major contributor smog major problem urban areas.prolonged exposure hydrocarbons contributes asthma liver disease lung disease cancer.regulations governing hydrocarbons vary according type engine jurisdiction cases nonmethane hydrocarbons regulated cases total hydrocarbons regulated. |
Vehicle emissions control | technology one application meet nonmethane hydrocarbon standard may suitable use application meet total hydrocarbon standard.methane directly toxic difficult break fuel vent lines charcoal canister meant collect contain fuel vapors route either back fuel tank engine started warmed air intake burned engine.carbon monoxide co – product incomplete combustion inhaled carbon monoxide reduces bloods ability carry oxygen overexposure carbon monoxide poisoning may fatal.carbon monoxide persistently binds hemoglobin oxygencarrying chemical red blood cells oxygen would temporarily bind.bonding co excludes also reduces ability hemoglobin release alreadybound oxygen counts rendering red blood cells ineffective.recovery slow release bound co bodys production new hemoglobin – healing process – full recovery moderate severe nonfatal co poisoning takes hours days. |
Vehicle emissions control | removing person copoisoned atmosphere fresh air stops injury yield prompt recovery unlike case person removed asphyxiating atmosphere i.e.one deficient oxygen.toxic effects delayed days also common.nox – generated nitrogen air reacts oxygen high temperature pressure inside engine.nox precursor smog acid rain.nox sum no. |
Vehicle emissions control | extremely reactive.nox production increased engine runs efficient i.e.hottest operating point tends natural tradeoff efficiency control nox emissions.expected reduced drastically use emulsion fuels.particulate matter – soot smoke made particles micrometre size range particulate matter causes negative health effects including limited respiratory disease cancer.fine particulate matter linked cardiovascular disease.sulfur oxide sox – general term oxides sulfur emitted motor vehicles burning fuel containing sulfur. |
Vehicle emissions control | reducing level fuel sulfur reduces level sulfur oxide emitted tailpipe.volatile organic compounds vocs – organic compounds typically boiling point less equal °c example chlorofluorocarbons cfcs formaldehyde.volatile organic compounds subsection hydrocarbons mentioned separately dangers public health.history throughout various federal state local governments united states conducted studies numerous sources air pollution.studies ultimately attributed significant portion air pollution automobile concluded air pollution bounded local political boundaries.time minimal emission control regulations existed u.s. promulgated municipal occasionally state level. |
Vehicle emissions control | ineffective local regulations gradually supplanted comprehensive state federal regulations.state california created california air resources board federal united states environmental protection agency epa established.agencies well state agencies create enforce emission regulations automobiles united states.similar agencies regulations contemporaneously developed implemented canada western europe australia japan.the first effort controlling pollution automobiles pcv positive crankcase ventilation system.draws crankcase fumes heavy unburned hydrocarbons – precursor photochemical smog – engines intake tract burned rather released unburned crankcase atmosphere. |
Vehicle emissions control | positive crankcase ventilation first installed widespread basis law new model cars first sold california.following year new york required it.new cars sold u.s. equipped pcv quickly became standard equipment vehicles worldwide.the first legislated exhaust tailpipe emission standards promulgated state california model year cars sold state followed united states whole model year .also first emission test cycle enacted state california measuring tailpipe emissions ppm parts per million.standards progressively tightened year year mandated epa.by model year emission standards tightened detuning techniques used meet seriously reducing engine efficiency thus increasing fuel usage. |
Vehicle emissions control | new emission standards model year well increase fuel usage forced invention catalytic converter aftertreatment exhaust gas.possible existing leaded gasoline lead residue contaminated platinum catalyst.general motors proposed american petroleum institute elimination leaded fuels later model year cars.production distribution unleaded fuel major challenge completed successfully time model year cars.modern cars equipped catalytic converters leaded fuel longer sold filling stations first world countries. |
Vehicle emissions control | leaded racing fuel available small quantities suppliers legal offroad use only.regulatory agencies agencies charged implementing exhaust emission standards vary jurisdiction jurisdiction even country.example united states overall responsibility belongs epa due special requirements state california emissions california regulated air resources board.texas texas railroad commission responsible regulating emissions lpgfueled rich burn engines gasolinefueled rich burn engines.north america california air resources board – california united states sourcesenvironment canada – canada sourcesenvironmental protection agency – united states sourcestexas railroad commission – texas united states lpgfueled engines onlytransport canada – canada trains ships japan ministry land infrastructure transport tourism road transport bureau environmental policy division europe european union control regulation emissions eu member states however many member states government bodies enforce implement regulations respective countries. |
Vehicle emissions control | short eu forms policy setting limits european emission standard member states decide best implement country.united kingdom united kingdom matters concerning environmental policy known devolved powers means constituent countries deals separately government bodies set deal environmental issues respective countryenvironment agency – england walesscottish environment protection agency sepa – scotlanddepartment environment – northern irelandhowever many ukwide policies handled department environment food rural affairs defra still subject eu regulations.emissions tests diesel cars carried mots northern ireland years despite legally required.emissions control engine efficiency steadily improved improved engine design precise ignition timing electronic ignition precise fuel metering computerized engine management.advances engine vehicle technology continually reduce toxicity exhaust leaving engine alone generally proved insufficient meet emissions goals.therefore technologies detoxify exhaust essential part emissions control.air injection one firstdeveloped exhaust emission control systems secondary air injection. |
Vehicle emissions control | originally system used inject air engines exhaust ports provide oxygen unburned partially burned hydrocarbons exhaust would finish burning.air injection used support catalytic converters oxidation reaction reduce emissions engine started cold.cold start engine needs airfuel mixture richer needs operating temperature catalytic converter function efficiently reached operating temperature.air injected upstream converter supports combustion exhaust headpipe speeds catalyst warmup reduces amount unburned hydrocarbon emitted tailpipe.exhaust gas recirculation united states canada many engines newer vehicles newer california system routes metered amount exhaust intake tract particular operating conditions. |
Vehicle emissions control | exhaust neither burns supports combustion dilutes airfuel charge reduce peak combustion chamber temperatures.turn reduces formation nox.catalytic converter catalytic converter device placed exhaust pipe converts hydrocarbons carbon monoxide nox less harmful gases using combination platinum palladium rhodium catalysts.there two types catalytic converter twoway threeway converter.twoway converters common threeway converters replaced automobile engines.see catalytic converter article details. |
Vehicle emissions control | evaporative emissions control evaporative emissions result gasoline vapors escaping vehicles fuel system.since u.s. vehicles fully sealed fuel systems vent directly atmosphere mandates systems type appeared contemporaneously jurisdictions.typical system vapors fuel tank carburetor bowl vent carbureted vehicles ducted canisters containing activated carbon.vapors adsorbed within canister certain engine operational modes fresh air drawn canister pulling vapor engine burns.remote sensing emission testing us states also using technology uses infrared ultraviolet light detect emissions vehicles pass public roads thus eliminating need owners go test center. |
Vehicle emissions control | invisible light flash detection exhaust gases commonly used metropolitan areas becoming broadly known europe.use emission test data emission test results individual vehicles many cases compiled evaluate emissions performance various classes vehicles efficacy testing program various emissionrelated regulations changes fuel formulations model effects auto emissions public health environment.alternative fuel vehicles pollution simply reduced making use clean vehicle propulsion.popular modes include hybrid pure electric propulsion.china far largest electric car market world. |
Vehicle emissions control | december china largest stock highway legal plugin passenger cars .million units global fleet use.experiments also conducted use solar powered vehicles almost ready near future photovoltaics technology improves.time viable solar cell alternatives cars prius sunroof covered cells would capable operating ventilation fan active sunshine.ref. |
Job control (Unix) | lets go solar see also ap compilation air pollutant emission factorsemission standardslow carbon economymotor vehicle emissionsonboard diagnosticsobdionboard refueling vapor recoveryontarios drive cleanportable emissions measurement systemroadway air dispersion modelingunited states emission standardseuropean emission standardsvehicle inspectionphaseout fossil fuel vehicles references external links manufacturers emission controls association mecadiesel information hubassociation emissions control catalyst aeccemission control systems familycar.comnational vehicle fuel emissions laboratory united states environmental protection agencyvehicle emissions testingbasic job control features suspending resuming terminating processes jobprocess group advanced features performed sending signals job.job control particular interest unix due multiprocessing distinguished job control generally frequently applied sequential execution batch processing.overview using unix unixlike operating systems via terminal terminal emulator user initially single process running login shell.tasks directory listing editing files etc.easily accomplished letting program take control terminal returning control shell program exits – formally attaching standard input standard output shell reads writes terminal catching signals sent keyboard like termination signal resulting pressing controlc.however sometimes user wish carry task using terminal another purpose. |
Job control (Unix) | task running receiving input terminal said running background single task receiving input terminal foreground.job control facility developed make possible allowing user start processes background send already running processes background bring background processes foreground suspend terminate processes.the concept job maps shell concept single shell command operating system concept possibly many processes command entails.multiprocess tasks come processes may create additional child processes single shell command may consist pipeline multiple communicating processes.example command select lines containing text title sort alphabetically display result pager.this creates least three processes one grep one sort one less.job control allows shell control related processes one entity user issues appropriate key combination usually controlz entire group processes gets suspended.jobs managed operating system single process group job shells internal representation group. |
Job control (Unix) | defined posix asa set processes comprising shell pipeline processes descended process group.a job referred handle called job control job id simply job id used shell builtins refer job.job ids begin character n identifies job n identifies current job.job ids specified posix.informal usage number may referred job number job id bash documentation refers prefixed job id jobspec.job control job ids typically used interactive use simplify referring process groups scripting pgids used instead precise robust indeed job control disabled default bash scripts.history job control first implemented c shell jim kulp iiasa austria making use features .bsd kernel.the kornshell developed bell labs adopted later incorporated svr version bourne shell exists modern unix shells. |
Job control (Unix) | commands posix standard specifies two commands resuming suspended jobs background foreground respectively bg fg.modeled korn shell job control commands.implementation typically shell keeps list jobs job table.recall job corresponds process group consists members pipeline descendants.jobs command list background jobs existing job table along job number job state stopped running. |
Job control (Unix) | session ends user logs exits shell terminates session leader process shell process sends sighup jobs waits process groups end terminating itself.the disown command used remove jobs job table session ends child process groups sent sighup shell wait terminate.thus become orphan processes may terminated operating system though often used processes adopted init kernel sets parent process init continue executing daemons.alternatives prevent jobs terminated include nohup using terminal multiplexer.a job running foreground stopped typing suspend character ctrlz.sends terminal stop signal sigtstp process group.default sigtstp causes processes receiving stop control returned shell. |
Job control (Unix) | however process register signal handler ignore sigtstp.process also paused stop signal sigstop cannot caught ignored.a job running foreground interrupted typing interruption character ctrlc.sends interrupt signal sigint defaults terminating process though overridden.a stopped job resumed background job bg builtin foreground job fg.either case shell redirects io appropriately sends sigcont signal process causes operating system resume execution.bash program started background job appending ampersand command line output directed terminal potentially interleaved programs output cannot read terminal input.a background process attempts read write controlling terminal sent sigttin input sigttou output signal. |
Job control (Unix) | signals stop process default may also handled ways.shells often override default stop action sigttou background processes deliver output controlling terminal default.in bashcompatible shells kill builtin binkill signal jobs job id well process group id – sending signal job sends whole process group jobs specified job id killed prefixing .kill send signal job however intent rid system processes signals sigkill sigterm default probably applicable.see also c shell notes references reading marshall kirk mckusick george v. nevilleneil .freebsd process management process groups sessions. |
Board of Control for Cricket in India | design implementation freebsd operating system.addison wesley.isbn .external links job control bash reference manualreached number uk albums chart – bands biggest hit lp – nominated q magazine one top albums .included single always last know reached number uk singles chart entered top us hot .track listing songs written justin currie except sometimes say name curie iain harviebe downfall – like man currie iain harvie – young – surface moon – wont take blame – first rule love – ones love lead nowhere – always last know – last lifetime – soon tide comes – behind fool – sometimes say name – personnel justin currie – vocals bass guitarsiain harvie – guitarsdavid cummings – guitarsandy alston – keyboardsbrian mcdermott – drumsnick clark – bass young wont take blame sometimes say name references external links official del amitri homepagedel amitri always last know youtubeautonomous organisation come national sports federation india.board formed december society registered tamil nadu societies registration act.bcci autonomous body review grants fundings sports ministry india.consortium state cricket associations state associations select representatives turn elect bcci chief.headquarters located wankhede stadium mumbai maharashtra. |
Board of Control for Cricket in India | grant govan first president anthony de mello first secretary.bcci three international cricket teams represent india international cricket india mens national cricket team india womens national cricket team india national cricket team.board organize matches scheduling teams.bcci richest cricket board world part big three international cricket along cricket australia england wales cricket board.history early years allindia cricket team visited england first time sponsored captained maharaja patiala.two representatives calcutta cricket club travelled london attend meetings imperial cricket conference predecessor current international cricket council.although technically official representative indian cricket allowed attend lord harris chairman conference. |
Board of Control for Cricket in India | outcome meeting mccs decision send team india led arthur gilligan captained england ashes.in meeting maharaja patiala others gilligan promised press inclusion icc promoters game land came together establish single controlling body.assurance given meeting held delhi november attended delegates patiala delhi united provinces rajputana alwar bhopal gwalior baroda kathiawar central provinces sindh punjab.consensus reached create board control cricket india december unanimous decision form provisional board control taken.december bcci formed.r e grant govan elected first president anthony de mello secretary. |
Board of Control for Cricket in India | indian cricket team toured england .world cup victory indias first world cup victory bcci bid world cup successfully organized showed organisational capabilities board.bccis logo derived star india.according information commissioner sridhar acharyulu bccis logo designed british raj .similar star india sign.reforms committee administrators surge cricket india bcci criticised monopolistic practices suffered corruption allegations. |
Board of Control for Cricket in India | supreme court january nominated fourmember panel committee administrators vinod rai ramachandra guha vikaram limaye diana edulji look administration bcci order implement lodha committee reforms.vinod rai excag india heads four members panel look administrative duties board fresh elections called.presently sourav ganguly president bcci.on august bcci agreed adhere antidoping mechanisms governed national antidoping agency.sunil joshi former indian cricket team spinner named chairman national selection panel cricket advisory committee cac bcci replacing m. s. k. prasad role.domestic cricket domestic competitions bcci organises following domestic cricket competitions mens domestic cricket bcci corporate trophy womens domestic cricket male junior level tournaments col. c. k. nayudu trophy mens one day trophy cooch behar trophy vinoo mankad trophy vijay merchant trophy .finances television production bcci established production unit. |
Board of Control for Cricket in India | bccis broadcast service production work indian cricket teams international matches home well leading domestic championships ipl .till company holds media rights used production work exchange money bcci.previously nimbus sports production board years.bccis production house holds production rights indian cricket.indian premier league bccis worlds lucrative richest cricket league indian premier league abbreviated ipl. |
Board of Control for Cricket in India | matches ipl begins late afternoon time evening.one biggest sports league world.clout worlds richest board financial clout bcci depend government india finances hence private entity.in us million us million india share icc ftp income disbursed test playing nations england wales cricket board received us million second highest earner.in revive financial health boards global economic decline significantly reduced income boards due covid pandemic icc rejig ftp schedule bilateral matches nations india.influence icc bcci regarded crickets big economic player.icc mainly governed board directors nominated member board. |
Board of Control for Cricket in India | every member board needs bilateral matches bcci high media rights value.boards go along bcci get good number bilateral matches leading high income bilateral series.generally work icc consultation bcci.icc bcci disagreement wada whereabouts clause.income total annual income fy – total annual income bcci estimated inr crore us million including inr crore us million ipl inr crore us million bilateral cricket nations inr crore us million per year total us million years indias share icc revenue. |
Board of Control for Cricket in India | revenue streams icc income share per present eightyear future tours program ftp india receives total us million icc contrasted us million england wales cricket board us million cricket australia cricket south africa pakistan cricket board new zealand cricket sri lanka cricket cricket west indies bangladesh cricket board us million zimbabwe.media rights star india bccis exclusive media rights period year .star india rights broadcast indian cricket teams matches tv channels star sports hd star sports hd etc.rights broadcast digital platform .crore rupees.on average star sports pays . |
Board of Control for Cricket in India | crore rupees per match board.deal also include rights broadcast mens domestic tournaments vijay hazare trophy ranji trophy irani cup duleep trophy mushtaq ali trophy womens international cricket matches india star sport channel disney plus hotstar.from global media rights ipl awarded star india ₹.crore us.billion.in media rights neutral venue oneday matches played next years awarded zee telefilms .million. |
Board of Control for Cricket in India | sponsorship rights star india official broadcaster bcci mpl kit sponsor byjus team sponsor paytm title sponsor bilateral series take place india domestic championships ranji trophy vijay hazare trophy sayyed mushtaq ali trophy irani trophy duleep trophy deodhar trophy.paytm title sponsorship rights .crore rupees –.dream ambuja hyundai official partners.expenditure cricketing infrastructure development september bcci announced spend ₹ crore subsequent one year upgrade cricket stadiums around country.donations march bcci president sourav ganguly donated ₹ crore pm cares fund combat covid pandemic india. |
Board of Control for Cricket in India | bcci donate litre oxygen concentrators help india fight covid.encouragement sports announced reward medal winners country tokyo olympics.players contracts welfare contracts – bcci created four grades contracted players b c. players grade get crores rupees year.players grade get crore b grades players gets crores c grades players receive crore rupees one year.pension schemes – bcci give pension former domestic international players played country.december bcci decided give rupees pension players played international test match nation.board gives rupees pension players played ranji trophy season. |
Board of Control for Cricket in India | bcci gave one time benefits domestic players played first class matches.womens cricketers board give rupees per month pension players played tests country rupees per month played tests.insurance – board provides five lakh rupees insurance players played board.taxation payments total amount tax ₹ .crore outstanding april cleared along interest september department revenue issued notice tax evasion bcci.department revenue asked bcci pay another outstanding income tax worth ₹ crore according details submitted finance ministry parliament february .earlier – although income tax department withdrew exemption bcci paid tax amounting ₹. |
Board of Control for Cricket in India | crore us.million tax liability ₹ crore us million – financial yearin bcci avoided taxes income claiming exemption charitable organisation.organisation president current president sourav ganguly former captain indian cricket team.anticorruption unit bcci special anticorruption unit responsibility stop malpractice cricket nation.unit investigate unlawful activities betting spotfixing matchfixing corrupt approaches players. |
Board of Control for Cricket in India | national selectors national mens cricket teams selector former india player chetan sharma incumbent chief selector mens cricket team.affiliated domestic member boards following state boards regional bodies affiliated bcci.category aandhra cricket associationassam cricket associationcricket association mizoramcricket association pondicherrydelhi district cricket associationgoa cricket associationgujarat cricket associationhimachal pradesh cricket associationkerala cricket associationmanipur cricket associationmeghalaya cricket associationnagaland cricket associationpunjab cricket associationsikkim cricket associationtripura cricket associationjammu kashmir cricket associationbaroda cricket associationvidarbha cricket associationcategory bhyderabad cricket associationtamil nadu cricket associationbihar cricket associationcricket association bengaluttar pradesh cricket associationmumbai cricket associationodisha cricket associationsaurashtra cricket associationmaharashtra cricket associationrajasthan cricket associationjharkhand state cricket associationarunachal pradesh cricket associationchhattisgarh cricket associationmadhya pradesh cricket associationkarnataka state cricket association allocation matches state boards bccis former president n. srinivasan criticised biased behaviour towards state boards giving odi test matches regime.bcci decides venues international series rotation policy.legal status according bcci receive grants fundings indian government.autonomous body. |
Board of Control for Cricket in India | supreme court india boards lawyers said indian cricket team play “the official team bcci official team india.” lawyers also claimed bcci “not even fly national flag” board never “use national emblem activities board.” sends players name prestigious awards arjuna award technically board national sports federation.bcci registered society tamil nadu state societies registration act denies coming article indian constitution.foundation bcci get sanctioned government india started governing body cricket india well representative india.bcci alleged use british raj emblem without prior permission government india offence emblem names prevention improper use act .see also cricket indiaindia national cricket teamindia cricket teambcci awards references external links official website |
Software quality assurance | – may include ensuring conformance standards models isoiec superseded iso spice cmmi.it includes standards procedures managers administrators even developers may use review audit software products activities verify software meets quality criteria link standards.according automotive spice based isoiec software quality assurance supporting process sup.provides independent assurance work products activities processes comply predefined plans quality strategies.sqa encompasses entire software development process including requirements engineering software design coding code reviews source code control software configuration management testing release management software integration.organized goals commitments abilities activities measurements verification validation.purpose sqa involves threeprong approachorganizationwide policies procedures standardsprojectspecific policies procedures standardscompliance appropriate proceduresguidelines application iso computer software described isoiecieee . |
Software quality assurance | external entities contracted part process assessments verify projects standardcompliant.specifically case software isoiec superseded iso considered applied software quality.activities quality assurance activities take place phase development.analysts use application technology techniques achieve highquality specifications designs modeldriven design.engineers technicians find bugs problems related software quality testing activities. |
Software quality assurance | standards process deviations identified addressed throughout development project managers quality managers also ensure changes functionality performance features architecture component general changes product service scope made appropriate review e.g.part change control boards.see also dodstdquality designsoftware assurancesoftware quality analystsoftware quality managementsoftware testing references external links ieee standard software quality assurance processes.doi.ieeestd... isbn .april alain .software quality assurance. |
Software quality assurance | wileyieee.isbn .chemuturi murali .software quality assurance best practices tools techniques software developers.j.ross publishing.isbn .software quality requirements. |
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Arms control | isbn .arms control typically exercised use diplomacy seeks impose limitations upon consenting participants international treaties agreements although may also comprise efforts nation group nations enforce limitations upon nonconsenting country.enactment arms control treaties agreements often seen way avoid costly arms races could prove counterproductive national aims future peace.used ways stop spread certain military technologies nuclear weaponry missile technology return assurances potential developers victims technologies.additionally arms control agreements entered limit damage done warfare especially civilians environment seen bad participants regardless wins war.while arms control treaties seen many peace proponents key tool war participants often seen simply ways limit high costs development building weapons even reduce costs associated war itself.arms control even way maintaining viability military action limiting weapons would make war costly destructive make longer viable tool national policy. |
Arms control | enforcement enforcement arms control agreements proven difficult time.agreements rely continued desire participants abide terms remain effective.usually nation longer desires abide terms usually seek either covertly circumvent terms end participation treaty.seen washington naval treaty subsequent london naval treaty participants sought work around limitations legitimately others.united states developed better technology get better performance ships still working within weight limits united kingdom exploited loophole terms italians misrepresented weight vessels limits japan left treaty. |
Arms control | nations violated terms treaty suffer great consequences actions.within little decade treaty abandoned.geneva protocol lasted longer successful respected still nations violated felt need.enforcement haphazard measures matter politics adherence terms.meant sanctions measures tended advocated violators primarily natural political enemies violations ignored given token measures political allies.more recent arms control treaties included stringent terms enforcement violations well verification. |
Arms control | last major obstacle effective enforcement violators often attempt covertly circumvent terms agreements.verification process determining whether nation complying terms agreement involves combination release information participants well way allow participants examine verify information.often involves much negotiation limits cases questions verification led breakdown treaty negotiations example verification cited major concern opponents comprehensive test ban treaty ultimately ratified united states.states may remain treaty seeking break limits treaty opposed withdrawing it.two major reasons.openly defy agreement even one withdraws often seen bad light politically carry diplomatic repercussions. |
Arms control | additionally one remains agreement competitors also participatory may held limitations terms withdrawal releases opponents make developments making limiting advantage development.theory arms control scholars practitioners john steinbruner jonathan dean stuart croft worked extensively theoretical backing arms control.arms control meant break security dilemma.aims mutual security partners overall stability crisis situation grand strategy stability put end arms race.stability arms control comes cost reduction damage limitation. |
Arms control | different disarmament since maintenance stability might allow mutually controlled armament take peacewithoutweaponsstance.nevertheless arms control defensive strategy principle since transparency equality stability fit offensive strategy.according study american political science review arms control rare successful arms control agreements involve difficult tradeoff transparency security.arms control agreements effective needs way thoroughly verify state following agreement intrusive inspections.however states often reluctant submit inspections reasons fear inspectors use inspections gather information capabilities state could used future conflict.history preth century one first recorded attempts arms control set rules laid ancient greece amphictyonic leagues. |
Arms control | rulings specified war could waged breaches could punished fines war.there recorded attempts control arms period rise roman catholic church.th th centuries ad swords chain mail armor manufactured frankish empire highly sought quality charlemagne r. – made sale export foreigners illegal punishable forfeiture property even death.attempt limit possession use equipment franks enemies including moors vikings slavs.the church used position transnational organization limit means warfare.peace god extended ruling protected noncombatants agrarian economic facilities property church war.truce god also tried prevent violence christians. |
Arms control | second lateran council prohibited use crossbows christians although prevent use nonchristians.the development firearms led increase devastation war.brutality wars period led efforts formalize rules war humane treatment prisoners war wounded well rules protect noncombatants pillaging property.however period beginning th century formal arms control agreements recorded except theoretical proposals imposed defeated armies.one treaty concluded strasbourg agreement .first international agreement limiting use chemical weapons case poison bullets.treaty signed france holy roman empire th century rush–bagot treaty united states united kingdom first arms control treaty considered modern industrial era leading demilitarization great lakes lake champlain region north america. |
Arms control | followed treaty washington led total demilitarization.the industrial revolution led increasing mechanization warfare well rapid advances development firearms increased potential devastation later seen battlefields world war led tsar nicholas ii russia calling together leaders nations first hague conference .conference led signing hague convention led rules declaring conducting warfare well use modern weaponry also led setting permanent court arbitration.second hague conference called leading additions amendments original agreement.third hague conference called abandoned due first world war.after world war league nations set attempted limit reduce arms.however enforcement policy effective. |
Arms control | various naval conferences washington naval conference held period first second world wars limit number size major warships five great naval powers.the geneva conference led banning chemical weapons toxic gases war part geneva protocol.kelloggbriand pact whilst ineffective attempted providing renunciation war instrument national policy.since world war ii united nations set body promote maintain international peace security.united states proposed baruch plan way impose stringent international control nuclear fuel cycle thereby avert global nuclear arms race soviet union rejected proposal negotiations failed.following president eisenhowers atoms peace speech un general assembly international atomic energy agency set promote peaceful uses nuclear technology apply safeguards diversion nuclear material peaceful uses nuclear weapons. |
Arms control | auspices united nations partial test ban treaty aimed end nuclear weapons testing atmosphere underwater outerspace established .nuclear nonproliferation treaty npt signed prevent spread nuclear weapons technology countries outside five already possessed united states soviet union united kingdom france china.three main goals establishing nonproliferation inspections nuclear arms reduction right use nuclear energy peacefully treaty initially met reluctance countries developing nuclear programs brazil argentina south africa.still countries exception india israel pakistan south sudan decided sign ratify document.the strategic arms limitation talks salt united states soviet union late searly led weapons control agreements.salt talks led antiballistic missile treaty interim strategic arms limitation agreement see salt . |
Arms control | salt ii talks started leading agreement .due soviet unions invasion afghanistan united states never ratified treaty agreement honoured sides.the intermediaterange nuclear forces treaty signed united states soviet union ratified leading agreement destroy missiles ranges kilometers.the chemical weapons convention signed banning manufacture use chemical weapons.the strategic arms reduction treaties signed start start ii us soviet union restricting weapons.moved treaty strategic offensive reductions turn superseded new start treaty.the comprehensive test ban treaty signed banning nuclear explosions environments military civilian purposes entered force due nonratification eight specific states.in united nations founded united nations office disarmament affairs unoda.goal promote nuclear disarmament nonproliferation strengthening disarmament regimes respect weapons mass destruction chemical biological weapons.also promotes disarmament efforts area conventional weapons especially landmines small arms often weapons choice contemporary conflicts.in addition treaties focused primarily stopping proliferation nuclear weapons recent movement regulate sale trading conventional weapons. |
Arms control | december united nations preparing entry force arms trade treaty ratified nations.however currently missing ratification key arms producers russia china united states signed treaty yet ratified it.treaty regulates international trade almost categories conventional weapons small arms battle tanks combat aircraft warships.ammunition well parts components also covered.recently united nations announced adoption treaty prohibition nuclear weapons following th ratification accession member states. |
Arms control | list treaties conventions related arms control important international arms control agreements followtreaty versailles – limited size germanys military world war iwashington naval treaty – part naval conferences – set limitations construction battleships battlecruisers aircraft carriers well tonnage quotas cruisers destroyers submarines united states united kingdom japan france italy.geneva protocol – prohibited use biological chemical weapons combatantarctic treaty signed entered force – prohibited military conflict antarcticapartial test ban treaty signed entered force – prohibited nuclear weapons testing atmosphereouter space treaty signed entered force – prohibited deployment weapons mass destruction including nuclear weapons spacenuclear nonproliferation treaty signed entered force – prohibited countries without nuclear weapons acquiring committing nucleararmed states eventual disarmamentseabed arms control treaty signed entered force – prohibited underwater nuclear testsstrategic arms limitation treaty salt signed ratified force – – limited introduction new intercontinental ballistic missile launchers submarinelaunched ballistic missilesantiballistic missile treaty signed entered force terminated following u.s. withdrawal – restricted antiballistic missilesbiological weapons convention signed entered force – prohibited production biological weaponsthreshold test ban treaty signed entered force – limited nuclear weapons tests kilotonssalt ii signed never entered force – limited production longrange intercontinental ballistic missilesenvironmental modification convention signed entered force – prohibited military use environmental modification techniquesconvention certain conventional weapons signed entered force – restricted certain conventional weapons landmines incendiary weapons laser weapons well requiring clearance unexploded ordnances.moon treaty signed entered force – prohibits militarization moonintermediaterange nuclear forces treaty inf treaty signed entered force united states russia announced withdrawal – limited shortrange intermediaterange ballistic missilestreaty conventional armed forces europe cfe treaty signed entered force – established limits deployment conventional military forces europe nato warsaw pactvienna document adopted updated – european agreement confidence securitybuilding measures prior notification military force activities inspections military activitiesstrategic arms reduction treaty start signed entered force expired start successor expired salt agreements.– provided limitations strategic offensive armschemical weapons convention signed entered force – prohibited production stockpiling chemical weaponsstart ii signed ratified united states russia terminated following russian withdrawal – prohibited intercontinental ballistic missiles multiple independently targetable reentry vehiclesopen skies treaty signed entered force – allowed unarmed reconnaissance flights nato russiacomprehensive nucleartestban treaty signed entered force.– prohibited nuclear weapons testingottawa treaty antipersonnel landmines signed entered force strategic offensive reductions treaty sort signed entered force expires – limited nuclear warheadsinternational code conduct ballistic missile proliferation signed – limited proliferation ballistic missilesconvention cluster munitions signed entered force – prohibits deployment production stockpiling cluster bombsnew start treaty signed russia united states april entered force february – reduced strategic nuclear missiles halfarms trade treaty concluded entered force december – regulates trade conventional weaponstreaty prohibition nuclear weapons signed entered force january – prohibits nuclear weapons nuclear weaponfree zone treaties treaty tlatelolco latin america caribbean signed entered force treaty rarotonga south pacific signed entered force treaty bangkok southeast asia signed entered force treaty pelindaba africa signed entered force treaty semipalatinsk central asia signed entered force treaties also envision creation nwfz among objectives.followingantarctic treaty signed entered force outer space treaty signed entered force seabed arms control treaty signed entered force treaties entered force comprehensive test ban treaty signed – prohibits nuclear weapons testing proposed treaties fissile material cutoff treaty – would prohibit production fissile materialnuclear weapons convention – would prohibit nuclear weaponsspace preservation treaty – would prohibit militarization spacefinal document framework united nations conference illicit trade small arms – would regulate small arms trade export control regimes zangger committee since nuclear suppliers group nsg since australia group since missile technology control regime mtcr since wassenaar arrangement since nonbinding declarations ayacucho declaration arms control organizations intergovernmental organizations arms control followinginternational atomic energy agency iaeaorganisation prohibition chemical weapons opcworganization security cooperation europe osce functions besides arms controlpreparatory commission comprehensive nucleartestban treaty organization ctbto prepcomconference disarmament cdunited nations office disarmament affairs unodaunited nations institute disarmament research unidirthe disbanded united nations monitoring verification inspection commission unmovic successor united nations special commission unscomfailed proposal organisation prohibition biological weaponsthere also numerous nongovernmental organizations promote global reduction nuclear arms offer research analysis u.s. nuclear weapons policy.preeminent among organizations arms control association founded promote public understanding support arms control. |
Arms control | others includefederation american scientists fas founded federation atomic scientists veterans manhattan project.campaign nuclear disarmament—a leading disarmament organization united kingdom founded .peace action—formerly sane committee sane nuclear policy founded physicians social responsibility psr founded bernard lown .council livable world—founded physicist leó szilárd scientists believed nuclear weapons controlled eventually eliminated.stockholm international peace research institute sipri founded union concerned scientists ucs founded faculty students massachusetts institute technology.arms control association—founded .center arms control nonproliferation—founded sister organization council livable world.international physicians prevention nuclear war ippnw founded alliance nuclear accountability—a national network organizations working address issues nuclear weapons production waste cleanup founded military production network.global zero—founded .see also references reading adelman kenneth l. .arms control human rights.world affairs.–. |
Arms control | jstor .amnesty international .arms control human rights.amnesty.org.amnesty international.boni giuseppe gaglianomaurizio.sicurezza internazionale e controllo degli armamenti. |
Arms control | new press coe andrew j. jane waynman..arms control rare.american political science review.croft stuart.strategies arms control history typology manchester university press .eloranta jari. |
Arms control | league nations fail.cliometrica .–.online league nationsforsberg randall ed.arms control reporter . |
Arms control | cambridge mit press –.glynn patrick.closing pandoras box arms races arms control history cold war onlinelarsen jeffrey a. historical dictionary arms control disarmament onlinemutschlerm max m. arms control space exploring conditions preventive arms control palgrave macmillan .smith james m. gwendolyn hall eds.milestones strategic arms control united states air force roles outcomes onlinethompson kenneth w. ed.presidents arms control process procedures problems university press america .u.s.arms control disarmament agency. |
Arms control | arms control disarmament agreements texts histories negotiations isbn wheelerbennett sir john disarmament security since locarno political technical background general disarmament conference .new york howard fertig .external links online books arms controlarms control nonproliferation catalog treaties agreements congressional research service may .the arms trade treaty glance.armscontrol.org.arms control association. |
Arms control | july .national counterproliferation center office director national intelligenceun disarmament affairscenter arms control nonproliferationcouncil livable worlddisarmament insight initiativestockholm international peace research institutes research arms control nonproliferationlecture masahiko asada entitled nuclear weapons international law lecture series united nations audiovisual library international lawarms control typically exercised use diplomacy seeks impose limitations upon consenting participants international treaties agreements although may also comprise efforts nation group nations enforce limitations upon nonconsenting country.enactment arms control treaties agreements often seen way avoid costly arms races could prove counterproductive national aims future peace.used ways stop spread certain military technologies nuclear weaponry missile technology return assurances potential developers victims technologies.additionally arms control agreements entered limit damage done warfare especially civilians environment seen bad participants regardless wins war.while arms control treaties seen many peace proponents key tool war participants often seen simply ways limit high costs development building weapons even reduce costs associated war itself.arms control even way maintaining viability military action limiting weapons would make war costly destructive make longer viable tool national policy. |
Arms control | enforcement enforcement arms control agreements proven difficult time.agreements rely continued desire participants abide terms remain effective.usually nation longer desires abide terms usually seek either covertly circumvent terms end participation treaty.seen washington naval treaty subsequent london naval treaty participants sought work around limitations legitimately others.united states developed better technology get better performance ships still working within weight limits united kingdom exploited loophole terms italians misrepresented weight vessels limits japan left treaty. |
Arms control | nations violated terms treaty suffer great consequences actions.within little decade treaty abandoned.geneva protocol lasted longer successful respected still nations violated felt need.enforcement haphazard measures matter politics adherence terms.meant sanctions measures tended advocated violators primarily natural political enemies violations ignored given token measures political allies.more recent arms control treaties included stringent terms enforcement violations well verification. |
Arms control | last major obstacle effective enforcement violators often attempt covertly circumvent terms agreements.verification process determining whether nation complying terms agreement involves combination release information participants well way allow participants examine verify information.often involves much negotiation limits cases questions verification led breakdown treaty negotiations example verification cited major concern opponents comprehensive test ban treaty ultimately ratified united states.states may remain treaty seeking break limits treaty opposed withdrawing it.two major reasons.openly defy agreement even one withdraws often seen bad light politically carry diplomatic repercussions. |
Arms control | additionally one remains agreement competitors also participatory may held limitations terms withdrawal releases opponents make developments making limiting advantage development.theory arms control scholars practitioners john steinbruner jonathan dean stuart croft worked extensively theoretical backing arms control.arms control meant break security dilemma.aims mutual security partners overall stability crisis situation grand strategy stability put end arms race.stability arms control comes cost reduction damage limitation. |
Arms control | different disarmament since maintenance stability might allow mutually controlled armament take peacewithoutweaponsstance.nevertheless arms control defensive strategy principle since transparency equality stability fit offensive strategy.according study american political science review arms control rare successful arms control agreements involve difficult tradeoff transparency security.arms control agreements effective needs way thoroughly verify state following agreement intrusive inspections.however states often reluctant submit inspections reasons fear inspectors use inspections gather information capabilities state could used future conflict.history preth century one first recorded attempts arms control set rules laid ancient greece amphictyonic leagues. |
Arms control | rulings specified war could waged breaches could punished fines war.there recorded attempts control arms period rise roman catholic church.th th centuries ad swords chain mail armor manufactured frankish empire highly sought quality charlemagne r. – made sale export foreigners illegal punishable forfeiture property even death.attempt limit possession use equipment franks enemies including moors vikings slavs.the church used position transnational organization limit means warfare.peace god extended ruling protected noncombatants agrarian economic facilities property church war.truce god also tried prevent violence christians. |
Arms control | second lateran council prohibited use crossbows christians although prevent use nonchristians.the development firearms led increase devastation war.brutality wars period led efforts formalize rules war humane treatment prisoners war wounded well rules protect noncombatants pillaging property.however period beginning th century formal arms control agreements recorded except theoretical proposals imposed defeated armies.one treaty concluded strasbourg agreement .first international agreement limiting use chemical weapons case poison bullets.treaty signed france holy roman empire th century rush–bagot treaty united states united kingdom first arms control treaty considered modern industrial era leading demilitarization great lakes lake champlain region north america. |
Arms control | followed treaty washington led total demilitarization.the industrial revolution led increasing mechanization warfare well rapid advances development firearms increased potential devastation later seen battlefields world war led tsar nicholas ii russia calling together leaders nations first hague conference .conference led signing hague convention led rules declaring conducting warfare well use modern weaponry also led setting permanent court arbitration.second hague conference called leading additions amendments original agreement.third hague conference called abandoned due first world war.after world war league nations set attempted limit reduce arms.however enforcement policy effective. |
Arms control | various naval conferences washington naval conference held period first second world wars limit number size major warships five great naval powers.the geneva conference led banning chemical weapons toxic gases war part geneva protocol.kelloggbriand pact whilst ineffective attempted providing renunciation war instrument national policy.since world war ii united nations set body promote maintain international peace security.united states proposed baruch plan way impose stringent international control nuclear fuel cycle thereby avert global nuclear arms race soviet union rejected proposal negotiations failed.following president eisenhowers atoms peace speech un general assembly international atomic energy agency set promote peaceful uses nuclear technology apply safeguards diversion nuclear material peaceful uses nuclear weapons. |
Arms control | auspices united nations partial test ban treaty aimed end nuclear weapons testing atmosphere underwater outerspace established .nuclear nonproliferation treaty npt signed prevent spread nuclear weapons technology countries outside five already possessed united states soviet union united kingdom france china.three main goals establishing nonproliferation inspections nuclear arms reduction right use nuclear energy peacefully treaty initially met reluctance countries developing nuclear programs brazil argentina south africa.still countries exception india israel pakistan south sudan decided sign ratify document.the strategic arms limitation talks salt united states soviet union late searly led weapons control agreements.salt talks led antiballistic missile treaty interim strategic arms limitation agreement see salt . |
Arms control | salt ii talks started leading agreement .due soviet unions invasion afghanistan united states never ratified treaty agreement honoured sides.the intermediaterange nuclear forces treaty signed united states soviet union ratified leading agreement destroy missiles ranges kilometers.the chemical weapons convention signed banning manufacture use chemical weapons.the strategic arms reduction treaties signed start start ii us soviet union restricting weapons.moved treaty strategic offensive reductions turn superseded new start treaty.the comprehensive test ban treaty signed banning nuclear explosions environments military civilian purposes entered force due nonratification eight specific states.in united nations founded united nations office disarmament affairs unoda.goal promote nuclear disarmament nonproliferation strengthening disarmament regimes respect weapons mass destruction chemical biological weapons.also promotes disarmament efforts area conventional weapons especially landmines small arms often weapons choice contemporary conflicts.in addition treaties focused primarily stopping proliferation nuclear weapons recent movement regulate sale trading conventional weapons. |
Arms control | december united nations preparing entry force arms trade treaty ratified nations.however currently missing ratification key arms producers russia china united states signed treaty yet ratified it.treaty regulates international trade almost categories conventional weapons small arms battle tanks combat aircraft warships.ammunition well parts components also covered.recently united nations announced adoption treaty prohibition nuclear weapons following th ratification accession member states. |
Arms control | list treaties conventions related arms control important international arms control agreements followtreaty versailles – limited size germanys military world war iwashington naval treaty – part naval conferences – set limitations construction battleships battlecruisers aircraft carriers well tonnage quotas cruisers destroyers submarines united states united kingdom japan france italy.geneva protocol – prohibited use biological chemical weapons combatantarctic treaty signed entered force – prohibited military conflict antarcticapartial test ban treaty signed entered force – prohibited nuclear weapons testing atmosphereouter space treaty signed entered force – prohibited deployment weapons mass destruction including nuclear weapons spacenuclear nonproliferation treaty signed entered force – prohibited countries without nuclear weapons acquiring committing nucleararmed states eventual disarmamentseabed arms control treaty signed entered force – prohibited underwater nuclear testsstrategic arms limitation treaty salt signed ratified force – – limited introduction new intercontinental ballistic missile launchers submarinelaunched ballistic missilesantiballistic missile treaty signed entered force terminated following u.s. withdrawal – restricted antiballistic missilesbiological weapons convention signed entered force – prohibited production biological weaponsthreshold test ban treaty signed entered force – limited nuclear weapons tests kilotonssalt ii signed never entered force – limited production longrange intercontinental ballistic missilesenvironmental modification convention signed entered force – prohibited military use environmental modification techniquesconvention certain conventional weapons signed entered force – restricted certain conventional weapons landmines incendiary weapons laser weapons well requiring clearance unexploded ordnances.moon treaty signed entered force – prohibits militarization moonintermediaterange nuclear forces treaty inf treaty signed entered force united states russia announced withdrawal – limited shortrange intermediaterange ballistic missilestreaty conventional armed forces europe cfe treaty signed entered force – established limits deployment conventional military forces europe nato warsaw pactvienna document adopted updated – european agreement confidence securitybuilding measures prior notification military force activities inspections military activitiesstrategic arms reduction treaty start signed entered force expired start successor expired salt agreements.– provided limitations strategic offensive armschemical weapons convention signed entered force – prohibited production stockpiling chemical weaponsstart ii signed ratified united states russia terminated following russian withdrawal – prohibited intercontinental ballistic missiles multiple independently targetable reentry vehiclesopen skies treaty signed entered force – allowed unarmed reconnaissance flights nato russiacomprehensive nucleartestban treaty signed entered force.– prohibited nuclear weapons testingottawa treaty antipersonnel landmines signed entered force strategic offensive reductions treaty sort signed entered force expires – limited nuclear warheadsinternational code conduct ballistic missile proliferation signed – limited proliferation ballistic missilesconvention cluster munitions signed entered force – prohibits deployment production stockpiling cluster bombsnew start treaty signed russia united states april entered force february – reduced strategic nuclear missiles halfarms trade treaty concluded entered force december – regulates trade conventional weaponstreaty prohibition nuclear weapons signed entered force january – prohibits nuclear weapons nuclear weaponfree zone treaties treaty tlatelolco latin america caribbean signed entered force treaty rarotonga south pacific signed entered force treaty bangkok southeast asia signed entered force treaty pelindaba africa signed entered force treaty semipalatinsk central asia signed entered force treaties also envision creation nwfz among objectives.followingantarctic treaty signed entered force outer space treaty signed entered force seabed arms control treaty signed entered force treaties entered force comprehensive test ban treaty signed – prohibits nuclear weapons testing proposed treaties fissile material cutoff treaty – would prohibit production fissile materialnuclear weapons convention – would prohibit nuclear weaponsspace preservation treaty – would prohibit militarization spacefinal document framework united nations conference illicit trade small arms – would regulate small arms trade export control regimes zangger committee since nuclear suppliers group nsg since australia group since missile technology control regime mtcr since wassenaar arrangement since nonbinding declarations ayacucho declaration arms control organizations intergovernmental organizations arms control followinginternational atomic energy agency iaeaorganisation prohibition chemical weapons opcworganization security cooperation europe osce functions besides arms controlpreparatory commission comprehensive nucleartestban treaty organization ctbto prepcomconference disarmament cdunited nations office disarmament affairs unodaunited nations institute disarmament research unidirthe disbanded united nations monitoring verification inspection commission unmovic successor united nations special commission unscomfailed proposal organisation prohibition biological weaponsthere also numerous nongovernmental organizations promote global reduction nuclear arms offer research analysis u.s. nuclear weapons policy.preeminent among organizations arms control association founded promote public understanding support arms control. |
Arms control | others includefederation american scientists fas founded federation atomic scientists veterans manhattan project.campaign nuclear disarmament—a leading disarmament organization united kingdom founded .peace action—formerly sane committee sane nuclear policy founded physicians social responsibility psr founded bernard lown .council livable world—founded physicist leó szilárd scientists believed nuclear weapons controlled eventually eliminated.stockholm international peace research institute sipri founded union concerned scientists ucs founded faculty students massachusetts institute technology.arms control association—founded .center arms control nonproliferation—founded sister organization council livable world.international physicians prevention nuclear war ippnw founded alliance nuclear accountability—a national network organizations working address issues nuclear weapons production waste cleanup founded military production network.global zero—founded .see also references reading adelman kenneth l. .arms control human rights.world affairs.–. |
Arms control | jstor .amnesty international .arms control human rights.amnesty.org.amnesty international.boni giuseppe gaglianomaurizio.sicurezza internazionale e controllo degli armamenti. |
Arms control | new press coe andrew j. jane waynman..arms control rare.american political science review.croft stuart.strategies arms control history typology manchester university press .eloranta jari. |
Arms control | league nations fail.cliometrica .–.online league nationsforsberg randall ed.arms control reporter . |
Arms control | cambridge mit press –.glynn patrick.closing pandoras box arms races arms control history cold war onlinelarsen jeffrey a. historical dictionary arms control disarmament onlinemutschlerm max m. arms control space exploring conditions preventive arms control palgrave macmillan .smith james m. gwendolyn hall eds.milestones strategic arms control united states air force roles outcomes onlinethompson kenneth w. ed.presidents arms control process procedures problems university press america .u.s.arms control disarmament agency. |
Arms control | arms control disarmament agreements texts histories negotiations isbn wheelerbennett sir john disarmament security since locarno political technical background general disarmament conference .new york howard fertig .external links online books arms controlarms control nonproliferation catalog treaties agreements congressional research service may .the arms trade treaty glance.armscontrol.org.arms control association. |
Process control | july .national counterproliferation center office director national intelligenceun disarmament affairscenter arms control nonproliferationcouncil livable worlddisarmament insight initiativestockholm international peace research institutes research arms control nonproliferationlecture masahiko asada entitled nuclear weapons international law lecture series united nations audiovisual library international lawimplemented widely industries automotive mining dredging oil refining pulp paper manufacturing chemical processing power generating plants.there wide range size type complexity enables small number operators manage complex processes high degree consistency.development large industrial process control systems instrumental enabling design large high volume complex processes could otherwise economically safely operated.the applications range controlling temperature level single process vessel complete chemical processing plant several thousand control loops.history early process control breakthroughs came frequently form water control devices.ktesibios alexandria credited inventing float valves regulate water level water clocks rd century bc.st century ad heron alexandria invented water valve similar fill valve used modern toilets.later process controls inventions involved basic physics principles. |
Process control | cornlis drebbel invented bimetallic thermostat controlling temperature furnace.denis papin discovered pressure inside vessel could regulated placing weights top vessel lid.edmund lee created fantail improve windmill efficiency fantail smaller windmill placed ° larger fans keep face windmill pointed directly oncoming wind.with dawn industrial revolution process controls inventions aimed replace human operators mechanized processes.oliver evans created waterpowered flourmill operated using buckets screw conveyors.henry ford applied theory assembly line created decrease human intervention automobile production process.for continuously variable process control formal control law call pid control threeterm control first developed using theoretical analysis russian american engineer nicolas minorsky. |
Process control | minorsky researching designing automatic ship steering us navy based analysis observations helmsman.noted helmsman steered ship based current course error also past error well current rate change given mathematical treatment minorsky.his goal stability general control simplified problem significantly.proportional control provided stability small disturbances insufficient dealing steady disturbance notably stiff gale due steadystate error required adding integral term.finally derivative term added improve stability control.development modern process control operations process control large industrial plants evolved many stages. |
Process control | initially control would panels local process plant.however required large manpower resource attend dispersed panels overall view process.next logical development transmission plant measurements permanentlymanned central control room.effectively centralisation localised panels advantages lower manning levels easier overview process.often controllers behind control room panels automatic manual control outputs transmitted back plant. |
Process control | however whilst providing central control focus arrangement inflexible control loop controller hardware continual operator movement within control room required view different parts process.with coming electronic processors graphic displays became possible replace discrete controllers computerbased algorithms hosted network inputoutput racks control processors.could distributed around plant communicate graphic display control room rooms.distributed control system born.the introduction dcss allowed easy interconnection reconfiguration plant controls cascaded loops interlocks easy interfacing production computer systems.enabled sophisticated alarm handling introduced automatic event logging removed need physical records chart recorders allowed control racks networked thereby located locally plant reduce cabling runs provided high level overviews plant status production levels.hierarchy accompanying diagram general model shows functional manufacturing levels large process using processor computerbased control.referring diagram level contains field devices flow temperature sensors process value readings pv final control elements fce control valves level contains industrialised inputoutput io modules associated distributed electronic processors level contains supervisory computers collate information processor nodes system provide operator control screens level production control level directly control process concerned monitoring production monitoring targets level production scheduling level. |
Process control | control model determine fundamental model process inputs outputs system defined differently chemical processes.balance equations defined control inputs outputs rather material inputs.control model set equations used predict behavior system help determine response change be.state variable x measurable variable good indicator state system temperature energy balance volume mass balance concentration component balance.input variable u specified variable commonly include flow rates. |
Process control | important note entering exiting flows considered control inputs.control input classified manipulated disturbance unmonitored variable.parameters p usually physical limitation something fixed system vessel volume viscosity material.output metric used determine behavior system.control output classified measured unmeasured unmonitored. |
Process control | types processes characterized batch continuous hybrid.batch applications require specific quantities raw materials combined specific ways particular duration produce intermediate end result.one example production adhesives glues normally require mixing raw materials heated vessel period time form quantity end product.important examples production food beverages medicine.batch processes generally used produce relatively low intermediate quantity product per year pounds millions pounds.a continuous physical system represented variables smooth uninterrupted time. |
Process control | control water temperature heating jacket example example continuous process control.important continuous processes production fuels chemicals plastics.continuous processes manufacturing used produce large quantities product per year millions billions pounds.controls use feedback pid controller pid controller includes proportional integrating derivative controller functions.applications elements batch continuous process control often called hybrid applications. |
Process control | control loops fundamental building block industrial control system control loop controls one process variable.example shown accompanying diagram flow rate pipe controlled pid controller assisted effectively cascaded loop form valve servocontroller ensure correct valve positioning.some large systems may several hundreds thousands control loops.complex processes loops interactive operation one loop may affect operation another.system diagram representing control loops piping instrumentation diagram.commonly used control systems include programmable logic controller plc distributed control system dcs scada.a example shown.control valve used hold level tank level controller would compare equivalent reading level sensor level setpoint determine whether less valve opening necessary keep level constant. |
Process control | cascaded flow controller could calculate change valve position.economic advantages economic nature many products manufactured batch continuous processes require highly efficient operation due thin margins.competing factor process control products must meet certain specifications order satisfactory.specifications come two forms minimum maximum property material product range within property must be.loops susceptible disturbances therefore buffer must used process set points ensure disturbances cause material product go specifications. |
Process control | buffer comes economic cost i.e.additional processing maintaining elevated depressed process conditions etc..process efficiency enhanced reducing margins necessary ensure product specifications met.done improving control process minimize effect disturbances process.efficiency improved two step method narrowing variance shifting target.margins narrowed various process upgrades i.e. |
Process control | equipment upgrades enhanced control methods etc.. margins narrowed economic analysis done process determine set point target shifted.less conservative process set points lead increased economic efficiency.effective process control strategies increase competitive advantage manufacturers employ them.see also references reading walker mark john .programmable logic controller prehistory emergence application pdf phd thesis. |
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