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Rice-hull bagwall construction is a system of building , [ 1 ] with results aesthetically similar to the use of earthbag or cob construction. [ 2 ] Woven polypropylene bags (or tubes) are tightly filled with raw rice hulls , and these are stacked up, layer upon layer, with strands of four-pronged barbed wire between. ... | https://en.wikipedia.org/wiki/Rice-hull_bagwall_construction |
The Rice University Department of Electrical and Computer Engineering is one of nine academic departments at the George R. Brown School of Engineering at Rice University . Ashutosh Sabharwal is the Department Chair. Originally the Rice Department of Electrical Engineering , it was renamed in 1984 to Electrical and Comp... | https://en.wikipedia.org/wiki/Rice_University_Electrical_and_Computer_Engineering |
In computability theory , the Rice–Shapiro theorem is a generalization of Rice's theorem , named after Henry Gordon Rice and Norman Shapiro . It states that when a semi-decidable property of partial computable functions is true on a certain partial function, one can extract a finite subfunction such that the property i... | https://en.wikipedia.org/wiki/Rice–Shapiro_theorem |
In logic , Richard's paradox is a semantical antinomy of set theory and natural language first described by the French mathematician Jules Richard in 1905. The paradox is ordinarily used to motivate the importance of distinguishing carefully between mathematics and metamathematics .
Kurt Gödel specifically cites Richa... | https://en.wikipedia.org/wiki/Richard's_paradox |
Richard "Dick" A. Andersen (November 16, 1942 – June 16, 2019) [ 4 ] was a professor of chemistry at the University of California, Berkeley , and faculty senior scientist at the chemical sciences division of Lawrence Berkeley National Laboratory . [ 5 ]
Born in Oklahoma in 1942, Richard Allan Andersen was raised and e... | https://en.wikipedia.org/wiki/Richard_A._Andersen_(chemist) |
Richard B. Wells (born 1953) was a Professor Emeritus at the University of Idaho in Moscow, Idaho . From 2006 until his retirement in 2013, he held concurrent appointments as Professor of Electrical and Computer Engineering, Professor of Neuroscience, Adjunct Professor of Philosophy, and Adjunct Professor of Materials... | https://en.wikipedia.org/wiki/Richard_B._Wells |
Richard F. W. Bader FRSC FCIC (October 15, 1931 – January 15, 2012) was a Canadian quantum chemist , noted for his work on the atoms in molecules theory. This theory attempts to establish a physical basis for many of the working concepts of chemistry , such as atoms in molecules and bonding, in terms of the topology o... | https://en.wikipedia.org/wiki/Richard_Bader |
Richard C. Willson is a professor of chemical and biomolecular engineering at the University of Houston noted for his work on the development of purification, detection, and measurement technologies for applications in pharmaceutical manufacturing, process control, and medical diagnostics. [ 1 ]
Willson received B.S. ... | https://en.wikipedia.org/wiki/Richard_C._Willson |
Julius Wilhelm Richard Dedekind ( / ˈ d eɪ d ɪ k ɪ n d / ; [ 1 ] German: [ˈdeːdəˌkɪnt] ; 6 October 1831 – 12 February 1916) was a German mathematician who made important contributions to number theory , abstract algebra (particularly ring theory ), and the axiomatic foundations of arithmetic . His best known contributi... | https://en.wikipedia.org/wiki/Richard_Dedekind |
Richard Dronskowski (born 11 November 1961, in Brilon ) is a German chemist and physicist. He is a full professor at the RWTH Aachen University .
Dronskowski studied chemistry and physics at the University of Münster from 1981 to 1986. [ 1 ] He completed his chemistry diploma with Bernt Krebs and Arndt Simon in 1987. ... | https://en.wikipedia.org/wiki/Richard_Dronskowski |
Richard Alexander Gibbs , AC , is an Australian geneticist. He is currently the Wofford Cain Chair and Professor of Molecular and Human Genetics at Baylor College of Medicine in Houston, Texas. [ 1 ]
In 1996, he founded the Human Genome Sequencing Center at BCM, which was one of five worldwide sites selected to comple... | https://en.wikipedia.org/wiki/Richard_Gibbs_(biologist) |
Richard K. Wilson (born March 23, 1959) is a molecular geneticist. He is the founding Executive Director of the Institute for Genomic Medicine at Nationwide Children’s Hospital and Professor of Pediatrics at the Ohio State University College of Medicine .
He received his A.B. degree (Microbiology) from Miami Universit... | https://en.wikipedia.org/wiki/Richard_K._Wilson |
Richard B. Kaner is an American synthetic inorganic chemist. He is a distinguished professor and the Dr. Myung Ki Hong Endowed Chair in Materials Innovation [ 1 ] at the University of California, Los Angeles , where he holds a joint appointment in the Department of Chemistry and Biochemistry and the Department of Mater... | https://en.wikipedia.org/wiki/Richard_Kaner |
Fellow National Academy of Sciences
Richard Lawrence "Larry" Edwards is an American geochemist and Distinguished McKnight University Professor and Regents Professor at the University of Minnesota . [ 1 ] He is one of the most cited and respected geochemists in the world, [ 2 ] and is well-known for his contributions t... | https://en.wikipedia.org/wiki/Richard_Lawrence_Edwards |
Richard Michael Durbin FRS [ 17 ] (born 1960) [ 15 ] is a British computational biologist [ 18 ] [ 19 ] [ 2 ] and Al-Kindi Professor of Genetics at the University of Cambridge . [ 20 ] [ 21 ] [ 22 ] [ 23 ] He also serves as an associate faculty member at the Wellcome Sanger Institute where he was previously a senior gr... | https://en.wikipedia.org/wiki/Richard_M._Durbin |
Richard M. Murray is a synthetic biologist and Thomas E. and Doris Everhart Professor of Control & Dynamical Systems and Bioengineering at Caltech , California. [ 1 ] [ 2 ] He was elected to the National Academy of Engineering in 2013 for "contributions in control theory and networked control systems with applications ... | https://en.wikipedia.org/wiki/Richard_M._Murray |
Richard M. Myers (born March 24, 1954) is an American geneticist and biochemist known for his work on the Human Genome Project (HGP) . The National Human Genome Research Institute says the HGP “[gave] the world a resource of detailed information about the structure, organization and function of the complete set of huma... | https://en.wikipedia.org/wiki/Richard_M._Myers |
Richard Muther (November 20, 1913 – October 15, 2014) was an American consulting engineer, faculty member at MIT, and author. He developed fundamental techniques used in plant layout, material handling, and other aspects of industrial engineering . [ 1 ] He was also known as "Mister Systematic". [ 2 ]
Muther was born ... | https://en.wikipedia.org/wiki/Richard_Muther_(industrial_engineer) |
Richard P. Simmons (born May 3, 1931) is an American metallurgist.
Simmons was born on May 3, 1931. He attended Massachusetts Institute of Technology (MIT) in 1949. He became a metallurgist at the Allegheny Ludlum Steel corporation in Pittsburgh . [ 1 ] He then worked for other steel companies before returning to bec... | https://en.wikipedia.org/wiki/Richard_P._Simmons |
Richard Robert Ernst (14 August 1933 – 4 June 2021) was a Swiss physical chemist and Nobel laureate. [ 2 ]
Ernst was awarded the Nobel Prize in Chemistry in 1991 for his contributions towards the development of Fourier transform nuclear magnetic resonance (NMR) spectroscopy [ 3 ] while at Varian Associates and ETH Zur... | https://en.wikipedia.org/wiki/Richard_R._Ernst |
Richard S. Potember is an American scientist and inventor. He is currently a principal systems engineer at MITRE . Prior to this he was a program manager in the Tactical Technology Office at the Defense Advanced Research Projects Agency ( DARPA ). He has been an instructor at the Whiting School of Engineering at the Jo... | https://en.wikipedia.org/wiki/Richard_S._Potember |
Richard Griffith Seed (May 22, 1928 – November 17, 2013) was an American physicist and businessman best known for forcing a national debate on human cloning in the late 1990s. [ 1 ]
Seed was born in Chicago, Illinois on May 22, 1928. He graduated from Oak Park and River Forest High School in Illinois before attending ... | https://en.wikipedia.org/wiki/Richard_Seed |
Richard Tenguerian ( Armenian : Տիգրան Թընկըրեան ; born, August 3, 1955) is an architectural model maker of Armenian descent. Some of his notable physical models include the Kingdom Center in Riyadh (1998), Yankee Stadium in New York (2006), The Sail @ Marina Bay in Singapore (2007), and Comcast Center in Philadelphia ... | https://en.wikipedia.org/wiki/Richard_Tenguerian |
Richard Vyškovský (13 July 1929 – 1 August 2019) [ 1 ] [ 2 ] was a Czech architect and creator of paper models.
In 1960s Vyškovský worked for the State institute for reconstruction of historic towns and monuments (SÚRPMO) in Prague . After a discussion with colleagues, complaining about the limited availability of die... | https://en.wikipedia.org/wiki/Richard_Vyškovský |
Richard Zach is a Canadian logician , philosopher of mathematics , and historian of logic and analytic philosophy . He is currently Professor of Philosophy at the University of Calgary .
Zach's research interests include the development of formal logic and historical figures ( Hilbert , Gödel , and Carnap ) associated... | https://en.wikipedia.org/wiki/Richard_Zach |
Richards' theorem is a mathematical result due to Paul I. Richards in 1947. The theorem states that for,
if Z ( s ) {\displaystyle Z(s)} is a positive-real function (PRF) then R ( s ) {\displaystyle R(s)} is a PRF for all real, positive values of k {\displaystyle k} . [ 1 ]
The theorem has applications in electrical... | https://en.wikipedia.org/wiki/Richards'_theorem |
The Richards equation represents the movement of water in unsaturated soils, and is attributed to Lorenzo A. Richards who published the equation in 1931. [ 1 ] It is a quasilinear partial differential equation ; its analytical solution is often limited to specific initial and boundary conditions. [ 2 ] Proof of the exi... | https://en.wikipedia.org/wiki/Richards_equation |
In mathematics , Richardson's theorem establishes the undecidability of the equality of real numbers defined by expressions involving integers , π , ln 2 , and exponential and sine functions. It was proved in 1968 by the mathematician and computer scientist Daniel Richardson of the University of Bath .
Specifically, t... | https://en.wikipedia.org/wiki/Richardson's_theorem |
The Richardson number ( Ri ) is named after Lewis Fry Richardson (1881–1953). [ 1 ] It is the dimensionless number that expresses the ratio of the buoyancy term to the flow shear term: [ 2 ]
where g {\displaystyle g} is gravity , ρ {\displaystyle \rho } is density, u {\displaystyle u} is a representative flow speed, a... | https://en.wikipedia.org/wiki/Richardson_number |
Richmann's law , [ 1 ] [ 2 ] sometimes referred to as Richmann's rule , [ 3 ] Richmann's mixing rule , [ 4 ] Richmann's rule of mixture [ 5 ] or Richmann's law of mixture , [ 6 ] is a physical law for calculating the mixing temperature when pooling multiple bodies. [ 5 ] It is named after the Baltic German physicist Ge... | https://en.wikipedia.org/wiki/Richmann's_law |
The Richtmyer–Meshkov instability (RMI) occurs when two fluids of different density are impulsively accelerated. Normally this is by the passage of a shock wave . The development of the instability begins with small amplitude perturbations which initially grow linearly with time. This is followed by a nonlinear regi... | https://en.wikipedia.org/wiki/Richtmyer–Meshkov_instability |
Ride height or ground clearance is the amount of space between the base of an automobile tire and the lowest point of the automobile, typically the bottom exterior of the differential housing (even though the lower shock mounting point may be lower); or, more properly, to the shortest distance between a flat, level sur... | https://en.wikipedia.org/wiki/Ride_height |
Ridge-post framing is an old type of timber framing .
The ridge board of their roof is not carried by king posts based on tie beams, but the ridge posts are based on the ground work. The German term for this construction is Firstständerhaus . The free-standing posts in the interior of the house and the posts in the gab... | https://en.wikipedia.org/wiki/Ridge-post_framing |
Ridges ( r egions of i ncrease d g ene e xpression) are domains of the genome with a high gene expression ; the opposite of ridges are antiridges . The term was first used by Caron et al. in 2001. [ 1 ] Characteristics of ridges are: [ 1 ]
Clustering of genes in prokaryotes was known for a long time. Their genes are g... | https://en.wikipedia.org/wiki/Ridge_(biology) |
In image processing , ridge detection is the attempt, via software, to locate ridges in an image , defined as curves whose points are local maxima of the function, akin to geographical ridges .
For a function of N variables, its ridges are a set of curves whose points are local maxima in N − 1 dimensions. In this res... | https://en.wikipedia.org/wiki/Ridge_detection |
In atomic physics, a ridged mirror (or ridged atomic mirror , or Fresnel diffraction mirror ) is a kind of atomic mirror , designed for the specular reflection of neutral particles ( atoms ) coming at a grazing incidence angle . In order to reduce the mean attraction of particles to the surface and increase the reflect... | https://en.wikipedia.org/wiki/Ridged_mirror |
In solid state physics the Ridley–Watkins–Hilsum theory ( RWH ) explains the mechanism by which differential negative resistance is developed in a bulk solid state semiconductor material when a voltage is applied to the terminals of the sample. [ 1 ] It is the theory behind the operation of the Gunn diode as well as se... | https://en.wikipedia.org/wiki/Ridley–Watkins–Hilsum_theory |
Rieche formylation is a type of formylation reaction . The substrates are electron rich aromatic compounds , such as mesitylene [ 1 ] or phenols , [ 2 ] with dichloromethyl methyl ether acting as the formyl source. The catalyst is titanium tetrachloride and the workup is acidic. The reaction is named after Alfred Riech... | https://en.wikipedia.org/wiki/Rieche_formylation |
A Rieke metal is a highly reactive metal powder generated by reduction of a metal salt with an alkali metal. These materials are named after Reuben D. Rieke, who first described along with an associate in 1972 the recipes for their preparation. [ 1 ] In 1974 he told about Rieke-magnesium. [ 2 ] A 1989 paper by Rieke li... | https://en.wikipedia.org/wiki/Rieke_metal |
Riemann invariants are mathematical transformations made on a system of conservation equations to make them more easily solvable. Riemann invariants are constant along the characteristic curves of the partial differential equations where they obtain the name invariant . They were first obtained by Bernhard Riemann in h... | https://en.wikipedia.org/wiki/Riemann_invariant |
A Riemann problem , named after Bernhard Riemann , is a specific initial value problem composed of a conservation equation together with piecewise constant initial data which has a single discontinuity in the domain of interest. The Riemann problem is very useful for the understanding of equations like Euler conservati... | https://en.wikipedia.org/wiki/Riemann_problem |
In mathematics , the Riemann series theorem , also called the Riemann rearrangement theorem , named after 19th-century German mathematician Bernhard Riemann , says that if an infinite series of real numbers is conditionally convergent , then its terms can be arranged in a permutation so that the new series converges to... | https://en.wikipedia.org/wiki/Riemann_series_theorem |
A Riemann solver is a numerical method used to solve a Riemann problem . They are heavily used in computational fluid dynamics and computational magnetohydrodynamics .
Generally speaking, Riemann solvers are specific methods for computing the numerical flux across a discontinuity in the Riemann problem. [ 1 ] They for... | https://en.wikipedia.org/wiki/Riemann_solver |
In mathematics , a Riemann sum is a certain kind of approximation of an integral by a finite sum. It is named after nineteenth century German mathematician Bernhard Riemann . One very common application is in numerical integration , i.e., approximating the area of functions or lines on a graph, where it is also known a... | https://en.wikipedia.org/wiki/Riemann_sum |
In mathematical general relativity , the Penrose inequality , first conjectured by Sir Roger Penrose , estimates the mass of a spacetime in terms of the total area of its black holes and is a generalization of the positive mass theorem . The Riemannian Penrose inequality is an important special case. Specifically, if... | https://en.wikipedia.org/wiki/Riemannian_Penrose_inequality |
Computational anatomy (CA) is the study of shape and form in medical imaging . The study of deformable shapes in CA rely on high-dimensional diffeomorphism groups Diff V {\displaystyle \operatorname {Diff} _{V}} which generate orbits of the form M ≐ { φ ⋅ m ∣ φ ∈ Diff V } {\displaystyle {\mathcal {M}}\doteq \{\varphi \... | https://en.wikipedia.org/wiki/Riemannian_metric_and_Lie_bracket_in_computational_anatomy |
In mathematics, the term Riemann–Hilbert correspondence refers to the correspondence between regular singular flat connections on algebraic vector bundles and representations of the fundamental group, and more generally to one of several generalizations of this.
The original setting appearing in Hilbert's twenty-first... | https://en.wikipedia.org/wiki/Riemann–Hilbert_correspondence |
In mathematics , Riemann–Hilbert problems , named after Bernhard Riemann and David Hilbert , are a class of problems that arise in the study of differential equations in the complex plane . Several existence theorems for Riemann–Hilbert problems have been produced by Mark Krein , Israel Gohberg and others. [ 1 ]
Suppo... | https://en.wikipedia.org/wiki/Riemann–Hilbert_problem |
In mathematics , the Riemann–Lebesgue lemma , named after Bernhard Riemann and Henri Lebesgue , states that the Fourier transform or Laplace transform of an L 1 function vanishes at infinity . It is of importance in harmonic analysis and asymptotic analysis .
Let f ∈ L 1 ( R n ) {\displaystyle f\in L^{1}(\mathbb {R} ^... | https://en.wikipedia.org/wiki/Riemann–Lebesgue_lemma |
In mathematics , the Riemann–Liouville integral associates with a real function f : R → R {\displaystyle f:\mathbb {R} \rightarrow \mathbb {R} } another function I α f of the same kind for each value of the parameter α > 0 . The integral is a manner of generalization of the repeated antiderivative of f in the sense tha... | https://en.wikipedia.org/wiki/Riemann–Liouville_integral |
The Riemschneider thiocarbamate synthesis converts alkyl or aryl thiocyanates to thiocarbamates under acidic conditions, followed by hydrolysis with ice water. [ 1 ] The reaction was discovered by the German chemist Randolph Riemschneider [ de ] in 1951 as a more efficient method to produce thiocarbamates. [ 2 ] Some r... | https://en.wikipedia.org/wiki/Riemschneider_thiocarbamate_synthesis |
Rien John Schuurhuis (born 12 August 1982) is a Dutch -born Vatican road cyclist and industrial design engineer who competed for the Vatican City in the 2022 , 2023 and 2024 UCI Road World Championships . He was the first cyclist and athlete who represented the Vatican City as a regular scoring competitor. [ 2 ]
Schuu... | https://en.wikipedia.org/wiki/Rien_Schuurhuis |
In mathematics , the Riesz potential is a potential named after its discoverer, the Hungarian mathematician Marcel Riesz . In a sense, the Riesz potential defines an inverse for a power of the Laplace operator on Euclidean space. They generalize to several variables the Riemann–Liouville integrals of one variable.
I... | https://en.wikipedia.org/wiki/Riesz_potential |
In mathematics , the Riesz rearrangement inequality , sometimes called Riesz–Sobolev inequality, states that any three non-negative functions f : R n → R + {\displaystyle f:\mathbb {R} ^{n}\to \mathbb {R} ^{+}} , g : R n → R + {\displaystyle g:\mathbb {R} ^{n}\to \mathbb {R} ^{+}} and h : R n → R + {\displaystyle h:\ma... | https://en.wikipedia.org/wiki/Riesz_rearrangement_inequality |
The Riesz representation theorem , sometimes called the Riesz–Fréchet representation theorem after Frigyes Riesz and Maurice René Fréchet , establishes an important connection between a Hilbert space and its continuous dual space . If the underlying field is the real numbers , the two are isometrically isomorphic ; if ... | https://en.wikipedia.org/wiki/Riesz_representation_theorem |
In mathematics, the Riesz–Markov–Kakutani representation theorem relates linear functionals on spaces of continuous functions on a locally compact space to measures in measure theory. The theorem is named for Frigyes Riesz ( 1909 ) who introduced it for continuous functions on the unit interval , Andrey Markov ( 1938 ... | https://en.wikipedia.org/wiki/Riesz–Markov–Kakutani_representation_theorem |
Rietveld refinement is a technique described by Hugo Rietveld for use in the characterisation of crystalline materials. The neutron and X-ray diffraction of powder samples results in a pattern characterised by reflections (peaks in intensity) at certain positions. The height, width and position of these reflections can... | https://en.wikipedia.org/wiki/Rietveld_refinement |
A riffle is a shallow landform in a flowing channel. [ 1 ] Colloquially, it is a shallow place in a river where water flows quickly past rocks. [ 2 ] However, in geology a riffle has specific characteristics.
Riffles are almost always found to have a very low discharge compared to the flow that fills the channel [ 3 ]... | https://en.wikipedia.org/wiki/Riffle |
Riftia pachyptila , commonly known as the giant tube worm and less commonly known as the giant beardworm , is a marine invertebrate in the phylum Annelida [ 1 ] (formerly grouped in phylum Pogonophora and Vestimentifera ) related to tube worms commonly found in the intertidal and pelagic zones . R. pachyptila lives on ... | https://en.wikipedia.org/wiki/Riftia |
Rig Expert Ukraine Ltd is a manufacturer of ham and PMR Two-way radio RF antenna analysis [ 1 ] and antenna tuning [ 2 ] equipment. The company was founded in 2003 and is headquartered in Kyiv , Ukraine .
The AA-30, AA-54 & AA-170 are almost the same product except for the frequency range. Similarly, the AA-600, AA-10... | https://en.wikipedia.org/wiki/RigExpert |
In mathematics and physics , the right-hand rule is a convention and a mnemonic , utilized to define the orientation of axes in three-dimensional space and to determine the direction of the cross product of two vectors , as well as to establish the direction of the force on a current-carrying conductor in a magnetic fi... | https://en.wikipedia.org/wiki/Right-hand_rule |
Right To Know is a non profit support project for those who discover via genealogical genetic testing that their lineage is not what they had supposed it to be due to family secrets and misattributed parentage, thus raising existential issues of adoption , race , ethnicity , culture , rape , etc. [ 1 ] [ 2 ] [ 3 ] [ 4... | https://en.wikipedia.org/wiki/Right_To_Know |
Right Interior Exterior
Adjacent Vertical Complementary Supplementary
Dihedral
In geometry and trigonometry , a right angle is an angle of exactly 90 degrees or π {\displaystyle \pi } / 2 radians [ 1 ] corresponding to a quarter turn . [ 2 ] If a ray is placed so that its endpoint is on a line and the adjacent a... | https://en.wikipedia.org/wiki/Right_angle |
Right ascension (abbreviated RA ; symbol α ) is the angular distance of a particular point measured eastward along the celestial equator from the Sun at the March equinox to the ( hour circle of the) point in question above the Earth. [ 1 ] When paired with declination , these astronomical coordinates specify the locat... | https://en.wikipedia.org/wiki/Right_ascension |
A right circular cylinder is a cylinder whose generatrices are perpendicular to the bases. Thus, in a right circular cylinder, the generatrix and the height have the same measurements. [ 1 ] It is also less often called a cylinder of revolution, because it can be obtained by rotating a rectangle of sides r {\displaysty... | https://en.wikipedia.org/wiki/Right_circular_cylinder |
In geometry , a right conoid is a ruled surface generated by a family of straight lines that all intersect perpendicularly to a fixed straight line, called the axis of the right conoid .
Using a Cartesian coordinate system in three-dimensional space , if we take the z -axis to be the axis of a right conoid, then the r... | https://en.wikipedia.org/wiki/Right_conoid |
The right of reply or right of correction generally means the right to defend oneself against public criticism in the same venue where it was published. In some countries, such as Brazil , [ 1 ] it is a legal right or even a constitutional right . In other countries, it is not a legal right as such, but a right which c... | https://en.wikipedia.org/wiki/Right_of_reply |
Right to know is a human right enshrined in law in several countries. UNESCO defines it as the right for people to "participate in an informed way in decisions that affect them, while also holding governments and others accountable". [ 1 ] It pursues universal access to information as essential foundation of inclusive... | https://en.wikipedia.org/wiki/Right_to_know |
Right to repair is a legal right for owners of devices and equipment to freely modify and repair products such as automobiles, electronics, and farm equipment. Right to repair may also refer to the social movement of citizens putting pressure on their governments to enact laws protecting a right to repair. [ 1 ]
Commo... | https://en.wikipedia.org/wiki/Right_to_repair |
A right triangle or right-angled triangle , sometimes called an orthogonal triangle or rectangular triangle , is a triangle in which two sides are perpendicular , forming a right angle ( 1 ⁄ 4 turn or 90 degrees ).
The side opposite to the right angle is called the hypotenuse (side c {\displaystyle c} in the figure). ... | https://en.wikipedia.org/wiki/Right_triangle |
With the adoption of a new constitution in 2008 under president Rafael Correa , Ecuador became the first country in the world to enshrine a set of codified Rights of Nature and to inform a more clarified content to those rights. Articles 10 and Chapter 7, Articles 71–74 of the Ecuadorian Constitution recognize the inal... | https://en.wikipedia.org/wiki/Rights_of_nature_in_Ecuador |
In structural engineering , a rigid frame is the load-resisting skeleton constructed with straight or curved members interconnected by predominantly rigid connections, which resist movements induced at the joints of members. Its members can resist bending moment, shear , and axial loads.
The two common assumptions as ... | https://en.wikipedia.org/wiki/Rigid_frame |
In rotordynamics , the rigid rotor is a mechanical model of rotating systems. An arbitrary rigid rotor is a 3-dimensional rigid object , such as a top . To orient such an object in space requires three angles, known as Euler angles . A special rigid rotor is the linear rotor requiring only two angles to describe, for e... | https://en.wikipedia.org/wiki/Rigid_rotor |
Rigid unit modes ( RUMs ) represent a class of lattice vibrations or phonons that exist in network materials such as quartz , cristobalite or zirconium tungstate . Network materials can be described as three-dimensional networks of polyhedral groups of atoms such as SiO 4 tetrahedra or TiO 6 octahedra. A RUM is a latti... | https://en.wikipedia.org/wiki/Rigid_unit_modes |
Rigidity theory , or topological constraint theory, is a tool for predicting properties of complex networks (such as glasses ) based on their composition. It was introduced by James Charles Phillips in 1979 [ 1 ] and 1981, [ 2 ] and refined by Michael Thorpe in 1983. [ 3 ] Inspired by the study of the stability of mech... | https://en.wikipedia.org/wiki/Rigidity_theory_(physics) |
Rigour ( British English ) or rigor ( American English ; see spelling differences ) describes a condition of stiffness or strictness. [ 1 ] These constraints may be environmentally imposed, such as "the rigours of famine "; logically imposed, such as mathematical proofs which must maintain consistent answers; or social... | https://en.wikipedia.org/wiki/Rigour |
The Riley oxidation is a selenium dioxide -mediated oxidation of methylene groups adjacent to carbonyls . It was first reported by Harry Lister Riley and co-workers in 1932. [ 1 ] In the decade that ensued, selenium -mediated oxidation rapidly expanded in use, and in 1939, Andre Guillemonat and co-workers disclosed the... | https://en.wikipedia.org/wiki/Riley_oxidation |
Rimose is an adjective used to describe a surface that is cracked or fissured. [ 1 ]
The term is often used in describing crustose lichens . [ 1 ] A rimose surface of a lichen is sometimes contrasted to the surface being areolate . [ 1 ] Areolate is an extreme form of being rimose, where the cracks or fissures are so ... | https://en.wikipedia.org/wiki/Rimose |
Rindler coordinates are a coordinate system used in the context of special relativity to describe the hyperbolic acceleration of a uniformly accelerating reference frame in flat spacetime. In relativistic physics the coordinates of a hyperbolically accelerated reference frame [ H 1 ] [ 1 ] constitute an important and u... | https://en.wikipedia.org/wiki/Rindler_coordinates |
Ring-closing metathesis ( RCM ) is a widely used variation of olefin metathesis in organic chemistry for the synthesis of various unsaturated rings via the intramolecular metathesis of two terminal alkenes , which forms the cycloalkene as the E- or Z- isomers and volatile ethylene . [ 1 ] [ 2 ]
The most commonly synth... | https://en.wikipedia.org/wiki/Ring-closing_metathesis |
RingGo is a pay by phone parking service, based in the UK owned by EasyPark Group .
The system is used by local authorities for on-street parking and public car parks. [ 1 ] [ 2 ] In 2023 RingGo had 10 million yearly customers, revenue of £30m and operating profit of £6m. [ 3 ]
It has been suggested that councils tha... | https://en.wikipedia.org/wiki/RingGo |
In chemistry , a ring is an ambiguous term referring either to a simple cycle of atoms and bonds in a molecule or to a connected set of atoms and bonds in which every atom and bond is a member of a cycle (also called a ring system ). A ring system that is a simple cycle is called a monocycle or simple ring , and one th... | https://en.wikipedia.org/wiki/Ring_(chemistry) |
Ring and Ball Apparatus is used to determine the softening point of bitumen , waxes, LDPE , HDPE /PP blend granules, rosin and solid hydrocarbon resins. [ 1 ] The apparatus was first designed in the 1910s while ASTM adopted a test method in 1916. This instrument is ideally used for materials having softening point in t... | https://en.wikipedia.org/wiki/Ring_and_Ball_Apparatus |
In organic chemistry , a ring flip (also known as a ring inversion or ring reversal ) is the interconversion of cyclic conformers that have equivalent ring shapes (e.g., from a chair conformer to another chair conformer) that results in the exchange of nonequivalent substituent positions. [ 1 ] The overall process gene... | https://en.wikipedia.org/wiki/Ring_flip |
A ring forming reaction or ring-closing reaction in organic chemistry is an umbrella term for a variety of reactions that introduce one or more rings into a molecule. A heterocycle forming reaction is a reaction that introduces a new heterocycle . [ 1 ] [ 2 ] Important classes of ring forming reactions include annulati... | https://en.wikipedia.org/wiki/Ring_forming_reaction |
In the geometry of circle packings in the Euclidean plane , the ring lemma gives a lower bound on the sizes of adjacent circles in a circle packing. [ 1 ]
The lemma states: Let n {\displaystyle n} be any integer greater than or equal to three. Suppose that the unit circle is surrounded by a ring of n {\displaystyle n}... | https://en.wikipedia.org/wiki/Ring_lemma |
In an electrical power distribution system, a ring main unit ( RMU ) is a factory assembled, metal enclosed set of switchgear used at the load connection points of a ring-type distribution network. It includes in one unit two switches that can connect the load to either or both main conductors, and a fusible switch or... | https://en.wikipedia.org/wiki/Ring_main_unit |
The Xbox 360 video game console was subject to a number of technical problems and failures, some as a result of design flaws. Some issues could be identified by a pattern of red lights on the front face of the console; these colloquially became known as the " Red Ring of Death " or the " RRoD ". [ 1 ] [ 2 ] There were ... | https://en.wikipedia.org/wiki/Ring_of_Death |
In mathematics, the ring of modular forms associated to a subgroup Γ of the special linear group SL(2, Z ) is the graded ring generated by the modular forms of Γ . The study of rings of modular forms describes the algebraic structure of the space of modular forms.
Let Γ be a subgroup of SL(2, Z ) that is of finite ind... | https://en.wikipedia.org/wiki/Ring_of_modular_forms |
In algebra and in particular in algebraic combinatorics , the ring of symmetric functions is a specific limit of the rings of symmetric polynomials in n indeterminates, as n goes to infinity. This ring serves as universal structure in which relations between symmetric polynomials can be expressed in a way independent o... | https://en.wikipedia.org/wiki/Ring_of_symmetric_functions |
In biology , a ring species is a connected series of neighbouring populations, each of which interbreeds with closely sited related populations, but for which there exist at least two "end populations" in the series, which are too distantly related to interbreed, though there is a potential gene flow between each "link... | https://en.wikipedia.org/wiki/Ring_species |
In organic chemistry , ring strain is a type of instability that exists when bonds in a molecule form angles that are abnormal. Strain is most commonly discussed for small rings such as cyclopropanes and cyclobutanes , whose internal angles are substantially smaller than the idealized value of approximately 109°. Bec... | https://en.wikipedia.org/wiki/Ring_strain |
A ring system is a disc or torus orbiting an astronomical object that is composed of solid material such as dust , meteoroids , planetoids , moonlets , or stellar objects.
Ring systems are best known as planetary rings, common components of satellite systems around giant planets such as the rings of Saturn , or circum... | https://en.wikipedia.org/wiki/Ring_system |
Ring vaccination is a strategy to inhibit the spread of a disease by vaccinating those who are most likely to be infected. [ 1 ]
This strategy vaccinates the contacts of confirmed patients, and people who are in close contact with those contacts. This way, everyone who has been, or could have been, exposed to a patien... | https://en.wikipedia.org/wiki/Ring_vaccination |
In telecommunications , the term ringaround has the following meanings:
This article related to telecommunications is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Ringaround |
In mathematics, a Ringel–Hall algebra is a generalization of the Hall algebra , studied by Claus Michael Ringel ( 1990 ). It has a basis of equivalence classes of objects of an abelian category , and the structure constants for this basis are related to the numbers of extensions of objects in the category. | https://en.wikipedia.org/wiki/Ringel–Hall_algebra |
Ringing out is a process in audio engineering technique used to prevent audio feedback between on-stage microphones and loudspeakers, and to maximize gain before feedback . Depending on the acoustics of a venue, certain frequencies may be resonant and thus will be more prone to feedback.
To ring out a room, a sound te... | https://en.wikipedia.org/wiki/Ringing_out |
The rings of Chariklo are a set of two narrow rings around the minor planet 10199 Chariklo . Chariklo, with a diameter of about 250 kilometres (160 mi), is the second-smallest celestial object with confirmed rings (with 2060 Chiron being the smallest [ 1 ] ) and the fifth ringed celestial object discovered in the Solar... | https://en.wikipedia.org/wiki/Rings_of_Chariklo |
The rings of Earth are a proposed set of planetary rings that may have at one point been present around Earth during the Ordovician period. These rings may have formed during the Ordovician impact spike approximately 466 million years ago. [ 1 ] [ 2 ] [ 3 ] They were first formally proposed by a team of scientists work... | https://en.wikipedia.org/wiki/Rings_of_Earth |
Rhea , the second-largest moon of Saturn , may have a tenuous ring system consisting of three narrow, relatively dense bands within a particulate disk. This would be the first discovery of rings around a moon . The potential discovery was announced in the journal Science on March 6, 2008. [ 2 ]
In November 2005 the Ca... | https://en.wikipedia.org/wiki/Rings_of_Rhea |
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