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6d3424d308c446b0f33edf6d12d71febc82e99ec | emmett reid dunn (november 21, 1894 – february | emmett reid dunn (november 21, 1894 – february 13, 1956) was an american herpetologist and educator noted for his work in panama and for studies of salamanders in the eastern united states. | wikipedia |
fd90914de7a30518676015813eb19b9a66b98dfb | helen h. fielding is a professor of physical | helen h. fielding is a professor of physical chemistry at university college london (ucl). she focuses on ultrafast transient spectroscopy of protein chromophores and molecules. she was the first woman to win the royal society of chemistry (rsc) harrison-meldola memorial prize (1996) and marlow award (2001). | wikipedia |
607c3c6a68373db2b6232e39b02b15b6e69d57bb | she has worked extensively on ultrafast chemical biology | she has worked extensively on ultrafast chemical biology in the gas phase. fielding developed time-resolved photoelectron spectroscopy to study the relaxation dynamics of photoexcited molecules. she has investigated the intramolecular dynamics of vibrationally and electronically excited benzene, and demonstrated new el... | wikipedia |
d9b44c1dc6b3c93ff1c25bfee264d2bcd3cd62ed | fielding was made an epsrc advanced research fellow | fielding was made an epsrc advanced research fellow in 2001, and was the first woman to be awarded the royal society of chemistry marlow medal. in 2003 fielding moved to university college london, where she leads a large laser laboratory. her recent research has focussed on the dynamics of excited states formed during ... | wikipedia |
e2490cdaee84d77fad2f4f94724a2881961cfb7c | she made the first observation of a wave | she made the first observation of a wave packet in a rydberg molecule in 2000. this observation made her interested in coherent control, looking to exploit the phase of a rotating rydberg molecule to manipulate the dynamics of chemical systems. she explored the decay pathways of the rydberg molecule no. fielding used t... | wikipedia |
3da3808ddd7112de757e063d7f9a3352f36fe7d6 | fielding was appointed a lecturer at king's college | fielding was appointed a lecturer at king's college london in 1994 after only 18 months of postdoctoral work. she was the first woman to be awarded the harrison-meldola memorial prize in 1996. she is interested in how to excite electron functions coherently, generating a wave packets with a localised probability distri... | wikipedia |
b3f95d22b60737ceb8b22e715426f2baa580553b | fielding was a scientist at the national physical | fielding was a scientist at the national physical laboratory from 1992 to 1993. in 1993 she joined the university of amsterdam as a postdoctoral fellow, working with ben van linden van den heuvell. here she worked on rydberg wave packets in coulombic and magnetic fields. | wikipedia |
b877e543402d60bc30f93edb233fd33f84e43c56 | fielding studied the natural sciences tripos at the | fielding studied the natural sciences tripos at the university of cambridge. she began her phd at the university of cambridge, working with timothy softley, but moved with him to the university of oxford where they studied excited quantum states using photoelectron spectroscopy. she was awarded her doctor of philosophy... | wikipedia |
717162e2e891d9479d433f5bfea8bd4e07545d58 | helen h. fielding frsc finstp cphys cchem is | helen h. fielding frsc finstp cphys cchem is a professor of physical chemistry at university college london (ucl). she focuses on ultrafast transient spectroscopy of protein chromophores and molecules. she was the first woman to win the royal society of chemistry (rsc) harrison-meldola memorial prize (1996) and marlow ... | wikipedia |
33aedf3b7eeb7b4484768d7944d17306068cb7e7 | sara josephine baker was an american physician notable | sara josephine baker was an american physician notable for making contributions to public health, especially in the immigrant communities of new york city. her fight against the damage that widespread urban poverty and ignorance caused to children, especially newborns, is perhaps her most lasting legacy. in 1917, she n... | wikipedia |
c627229a83e4e815ae2b849bde7d015c11297396 | in 1923, baker retired, but she did not | in 1923, baker retired, but she did not stop working. she became the first woman to be a professional representative to the league of nations when she served on the health committee for the united states from 1922 to 1924. she was also active in many groups and societies including over twenty-five medical societies and... | wikipedia |
32c99393b98f07cbbe16dc1f10a8a0719bd657fc | baker spent much of the later part of | baker spent much of the later part of her life with ida alexa ross wylie, a novelist, essayist, and hollywood scriptwriter from australia who identified as a "woman-oriented woman". when baker retired in 1923, she started to run their household while writing her autobiography, fighting for life. in 1935 and four years ... | wikipedia |
fbdb38d942cc2bc07ac92eba7ae75eae47c714cc | after the united states entered world war i, | after the united states entered world war i, baker became even better known. most of this publicity was generated from her comment to a new york times reporter. she told him that it was "six times safer to be soldier in the trenches of france than to be a baby born in the united states." she was able to start a lunch p... | wikipedia |
0571e9019fc4a4ddbc4fadfdbbbbc816d17b1678 | josephine baker was becoming famous, so much so | josephine baker was becoming famous, so much so that new york university medical school asked her to lecture there on children's health, or "child hygiene", as it was known at the time. baker said she would if she could also enroll in the school. the school initially turned her down, but eventually acquiesced after loo... | wikipedia |
8843b1f115206750f251151dfaff1448c616f64c | early in her career, baker had twice helped | early in her career, baker had twice helped to catch mary mallon, also known as "typhoid mary". mallon was the first known healthy carrier of typhoid, who instigated several separate outbreaks of the disease and is known to have infected more than 50 people through her job as a cook. at least three of the people she in... | wikipedia |
315b0ab7d557e08efe62da0a6ee925d34a045e50 | while baker was campaigning to license midwives, treat | while baker was campaigning to license midwives, treat blindness, encourage breastfeeding, provide safe pasteurized milk, and educate mothers, older children were still getting sick and malnourished. baker worked to make sure each school had its own doctor and nurse, and that the children were routinely checked for inf... | wikipedia |
1ff78a2a12ff93890a8adda98a4ccf23d1ee55e8 | through josephine baker's efforts, infants were much safer | through josephine baker's efforts, infants were much safer than they had been the previous year; blindness decreased from 300 babies per year to 3 per year. but there was still one area where infancy was dangerous: at birth. babies were often delivered by midwives, who were excluded from the formal training available t... | wikipedia |
e5a8c53a7c59216471efc6175655e0bd5b1f5b9c | baker aided in the prevention of infant blindness, | baker aided in the prevention of infant blindness, a scourge caused by gonorrhea bacteria transmitted during birth. to prevent blindness, babies were given drops of silver nitrate in their eyes. before baker arrived, the bottles in which the silver nitrate was kept would often become unsanitary or would contain doses t... | wikipedia |
24f06a901504948066e1cd250947b2752767bd7c | baker and a group of nurses started to | baker and a group of nurses started to train mothers in how to care for their babies: how to clothe infants to keep them from getting too hot, how to feed them a good diet, how to keep them from suffocating in their sleep, and how to keep them clean. she set up a milk station where clean milk was given out. commercial ... | wikipedia |
ddd9ae93f2bfe1c2e5de5ab716dbb945429e6ac0 | after working diligently in the school system, baker | after working diligently in the school system, baker was offered an opportunity to help lower the mortality rate in hell's kitchen. it was considered the worst slum in new york at the turn of the century, with as many as 4,500 people dying every week. baker decided to focus on the infant mortality rate in particular, a... | wikipedia |
75906af87c8e7fd027be9a08330f431d1d399bd2 | the way to keep people from dying from | the way to keep people from dying from disease, it struck me suddenly, was to keep them from falling ill. healthy people don't die. it sounds like a completely witless remark, but at that time it was a startling idea. preventative medicine had hardly been born yet and had no promotion in public health work. | wikipedia |
7dae60c04e982fb5d2bdf837cc1acc86cc24e281 | baker began practicing as a private physician in | baker began practicing as a private physician in new york city following her internship. in 1901, baker passed the civil service exam and qualified to be a medical inspector at the department of health, and worked as a part-time inspector in 1902. known as "dr. joe," she wore masculine-tailored suits and joked that col... | wikipedia |
8d16c6886874707379e3cb594d94e8e44e743248 | after studying chemistry and biology at home, she | after studying chemistry and biology at home, she enrolled in the new york infirmary medical college, a medical school for women, founded by the sisters and physicians elizabeth blackwell and emily blackwell. the only class she failed—"the normal child", taught by anne daniel —led to her fascination with the future rec... | wikipedia |
b56584dbf51d978cfe68d6ec77535240dde5ba82 | baker was born in poughkeepsie, new york, in | baker was born in poughkeepsie, new york, in 1873 to a wealthy quaker family. after her father and brother died of typhoid, baker felt pressure to support her mother and sister financially. so, at the age of 16, baker decided on a career in medicine. | wikipedia |
30f2bb8da8de4966d6fe986f4fb0ae47a0248df4 | sara josephine baker (november 15, 1873 – february | sara josephine baker (november 15, 1873 – february 22, 1945) was an american physician notable for making contributions to public health, especially in the immigrant communities of new york city. her fight against the damage that widespread urban poverty and ignorance caused to children, especially newborns, is perhaps... | wikipedia |
86e722918dc2a8f26bdaee3f1a184c370210eca5 | gerhard wilhelm goetze was a german-born ph.d. researcher | gerhard wilhelm goetze was a german-born ph.d. researcher and inventor in atomic physics. he was primarily known for his work on the moon-to-earth apollo tv camera making live broadcast in both brilliant sunlight and pitch darkness possible. goetze discovered the secondary electron conduction (sec) effect which amplifi... | wikipedia |
c9a62d7a8a72ad5d89b4f063a42f4f15e4ae7e84 | the sec tube was used on the orbiting | the sec tube was used on the orbiting astronomical observatory as the main sensor, on apollo 9, 10, 11, 12, and 13, in the atm satellites as well as the oso-h and sas-d space projects. | wikipedia |
2d37d24ec7ab320b5178a3d4bd003b7d798bb912 | the sec tube was used to build a | the sec tube was used to build a camera to transmit live images from the moon to earth on apollo 11. the tube was also employed in science in electron microscope biological tissue study; ground-based astronomy, material testing and inspection of integral circuits in industry, and security and police. | wikipedia |
1a59feefc8089f989e945f4b0a9bc2acf835d9c3 | the sec tube had dod highly top secret | the sec tube had dod highly top secret security classification but was the only device that could meet the apollo camera mission requirements to operate in both lunar day and night. the dod was asked to allow westinghouse the use of the sec tube for the apollo tv camera program. the task to develop this unique sec tube... | wikipedia |
4aeb6a3853b1969b23ab740d9e147ab26d8d4f75 | in the early 1960s in the pittsburgh research | in the early 1960s in the pittsburgh research laboratories the sec (secondary electron conduction) effect was discovered by goetze. this was developed for the department of defense (dod) for night vision in vietnam. it had the capability to produce clear images in motion at low light levels without motion distortion. | wikipedia |
f35f6d1b8df3a4710713041bba261f76c81c737f | in october 1960 at the fifth international congress | in october 1960 at the fifth international congress on high speed photography, a. anderson, manager of the applied physics department of westinghouse research laboratories stated that, "a new electronic tube, so sensitive it can 'see' individual particles of light, has enabled westinghouse scientists to photograph the ... | wikipedia |
318b51296535bf3ab2c76a767bf89b914311a69a | he continued his joy for flying his entire | he continued his joy for flying his entire life. his last aircraft, a 1960 single engine cessna 182 skylane was flown in 2007 after his death by his two sons, frank, senior pilot for fedex and thomas, mechanical engineer, across the atlantic ocean over 10 days and 40 flight hours from kassel airport, germany to beaver ... | wikipedia |
765ba61cc0395f1b83ed698529f2acddec106429 | while living in elmira, new york, goetze spent | while living in elmira, new york, goetze spent many weekends with his family at the harris hill soaring club pursuing his hobby as a sailplane pilot. in 1969 goetze traveled to pikes peak near colorado springs, colorado for the final qualifying test for the prestigious 3 diamond badge in gliding from the fai gliding co... | wikipedia |
cdb2269a40ba8269a313c54cf251b56df56651d2 | goetze's passion in life was for gliding. he | goetze's passion in life was for gliding. he began his interest at the blaue kuppe in the countryside of the werra-meißner area. goetze was one of the early members (1964) of the eschwege luftsportverrein (local glider soaring club). | wikipedia |
5a0f3168115ae98171fce81e626bcb6da115e5cb | in 1981 goetze headed fanal elektric, an electronic | in 1981 goetze headed fanal elektric, an electronic components manufacturer in germany, who sold 95% of its stock shares to westinghouse to secure the american market. in 1989, goetze along with other investors, purchased fanal elektric from westinghouse and grew fanal with 3 other firms; hundt & weber, maihak aktienge... | wikipedia |
9234aa113c26850b80a979a97facec340b9adf0d | in 1964, he moved with his wife and | in 1964, he moved with his wife and five children to elmira, new york, to continue his work at the westinghouse cathode ray tube facility in nearby horseheads, new york. as operations manager, goetze grew the department from a team of six to more than 170 scientists and staff. his work through westinghouse was an integ... | wikipedia |
d06de0740c718994342f28f21f61edba923ffbb1 | in the summer of 1959 the family moved | in the summer of 1959 the family moved to monroeville, pennsylvania, where goetze worked for the westinghouse electric corporation research and development laboratories in pittsburgh. his early research on night vision was initially classified for the department of defense. it was later declassified by the federal gove... | wikipedia |
84651a697718cd6bbeb73a91f3871deb83139071 | goetze traveled from germany to new york in | goetze traveled from germany to new york in january 1959 with his pregnant wife and two children under the sponsorship of the united states department of the army in the national interest. they lived for several months in the alamac hotel on broadway and west 71st street in new york city until employment was found. | wikipedia |
9fe37847c463f60c11232d59f683dd7e1a4ad2ff | in 1954, gerhard married lisa herta kohlus of | in 1954, gerhard married lisa herta kohlus of eschwege. they had five children, two born in the convent of vincent de paul in eschwege, germany; regina karin and martin gerhard and three children born in wilkinsburg, pennsylvania, us; frank walter, arleen susan and thomas wilhelm. their marriage ended in divorce. | wikipedia |
22871416d9f37f3fb11baaa2fec60aec087943b5 | his concentration in nuclear physics led to his | his concentration in nuclear physics led to his doctoral thesis in zerfallsschema und beta-spektrum des msth1 (ra228) (disintegration schematic and beta spectrum of mesothorium) (isotopes of radium). goetze later found electrons to be more interesting and continued his work in atomic physics. | wikipedia |
21d7de8ab5653487cfe11b445e7921738cbb3461 | from 1949 to 1958 goetze studied and taught | from 1949 to 1958 goetze studied and taught physics at the university of marburg. in 1951, he became a member of one of the oldest academic fraternities, the german student corps, saxonia, founded in 1886, with the motto in treue fest or "in loyalty firm". | wikipedia |
6b7d9e3afb777f6842540ec2fbe9a68af0ed40ea | goetze, along with his mother and baby sister, | goetze, along with his mother and baby sister, fled bartenstein, now named bartoszyce, on the last train on january 22, 1945, during the evacuation of east prussia. they made their way back to the family home in niederdünzebach. gerhard attended the gymnasium or college preparatory school, the friedrich-wilhelm schule ... | wikipedia |
25709901ce32f83ffa746224229b8956408a674c | gerhard w. goetze was born in niederdünzebach near | gerhard w. goetze was born in niederdünzebach near eschwege, hessen, germany on june 19, 1930, to walter kurt götze, a businessman, and anna katherine sieland. he attended the local primary school until his father was transferred to bartenstein, near königsberg, east prussia, germany to work at the local volksschule (p... | wikipedia |
250756d503104595a477dbdf376f882d5da7aced | in 1973 goetze received a franklin institute award, | in 1973 goetze received a franklin institute award, the longstreth medal established in 1890, for the conception and development of the sec tube, which played an important role in television, night surveillance and ultraviolet astronomical observations. | wikipedia |
ddc168804aff55b99066778f22a39e088d0bfb99 | gerhard wilhelm goetze (june 19, 1930 – january | gerhard wilhelm goetze (june 19, 1930 – january 17, 2007) was a german-born ph.d. researcher and inventor in atomic physics. he was primarily known for his work on the moon-to-earth apollo tv camera making live broadcast in both brilliant sunlight and pitch darkness possible. goetze discovered the secondary electron co... | wikipedia |
521deafbe37828019a17905af732692822a3d87b | rada went on to dukla prague in 2007, | rada went on to dukla prague in 2007, keeping three clean sheets in the first part of the 2007–08 czech 2. liga. rada played for dukla in the second division for four years before the club celebrated promotion to the top-flight gambrinus liga in 2011. rada was responsible for two of the visiting team's goals in august ... | wikipedia |
f1203dab8db0d19a6930bf63cf0fc15ad6350143 | rada started his footballing career at sparta prague, | rada started his footballing career at sparta prague, going out on loan in his younger years. he joined bohemians 1905 in the bohemian football league on a year-long loan in 2005, keeping a clean sheet in his first ever match in the czech third tier. however rada played just four league matches before moving on loan to... | wikipedia |
8d88b5582ee50f640fa86bbc8b077c23659de2e9 | baek jong-bum is a south korean professional footballer | baek jong-bum is a south korean professional footballer who plays as a goalkeeper for k league 1 club fc seoul. born in daejeon, he attended osan middle and high school, where he underwent training through fc seoul's development system. baek signed with the club in 2018 and made his debut professional appearance in the... | wikipedia |
73959a83b8c685613e69d8844e6031b51dd256c8 | baek made his debut professional appearance in the | baek made his debut professional appearance in the sixth round of the 2022 k league 1 season amid an outbreak of covid-19 among his team's squad, which faced off against jeju united fc on march 19. in the second half of the game, as defender jeong woo-jae was shooting, baek collided with the player's knee, resulting in... | wikipedia |
a4255df67e2df31ba1d533011a452999c7f943e7 | in a pool of 134 footballers, baek was | in a pool of 134 footballers, baek was one of 15 selected to advance directly into the k league 1 in 2018. he, along with four others, signed a 5-year contract with fc seoul, becoming the first of its players to have undergone the club's development system at both osan middle and high school. | wikipedia |
d926ae72105471a09134fb0908c83a242d1ede1b | baek was admitted to osan middle school and | baek was admitted to osan middle school and played for the fc seoul u-15 team at the 33rd seoul football association president's cup in 2014. during the penalty shoot-out at the finals, he blocked seil middle school's final goal attempt, leading his team to a 5–4 victory. the team won its first championship in its seco... | wikipedia |
05a3f2052c7a8544faf504d2be4af13b71e80e12 | baek jong-bum was born on january 21, 2001, | baek jong-bum was born on january 21, 2001, in daejeon, south korea. he attended daejeon jungang elementary school and played in its football team. it competed in the 2012 hwarang daegi national youth soccer tournament and advanced into the finals; baek received the gk (goalkeeper) award for his performance in the comp... | wikipedia |
3986790ab8f65678aac6cd7dc99f957dd27dad1c | baek jong-bum (korean: 백종범; born january 21, 2001) | baek jong-bum (korean: 백종범; born january 21, 2001) is a south korean professional footballer who plays as a goalkeeper for k league 1 club fc seoul. born in daejeon, he attended osan middle and high school, where he underwent training through fc seoul's development system. baek signed with the club in 2018 and made his... | wikipedia |
89e26a31cb7a333576ca0a9bc62891ac730e3741 | philip james devries is a tropical biologist whose | philip james devries is a tropical biologist whose research focuses on insect ecology and evolution, especially butterflies. his best-known work includes symbioses between caterpillars, ants and plants, and community level biodiversity of rainforest butterflies. devries is professor emeritus at the university of new or... | wikipedia |
4a241bcbb42b64b9961877a62da1951b762404ef | for decades, devries was involved with natural history | for decades, devries was involved with natural history documentary films as a writer, scientific advisor and on-camera presenter for production companies such as national geographic, partridge films, oxford scientific films, and granada. fifteen of these documentaries have been televised globally by national geographic... | wikipedia |
d05f488364525abb90841ae1d4b50593f60993c7 | devries discovered the substrate-borne calls produced by caterpillars | devries discovered the substrate-borne calls produced by caterpillars that form symbioses with ants in the butterfly families riodinidae and lycaenidae. in these symbioses, ants provide protection against arthropod predators in exchange for food secretions. devries demonstrated experimentally that the calls produced by... | wikipedia |
e590109d80185e72f99c2f611e55e25848929708 | recent honors include: in 2010, devries was elected | recent honors include: in 2010, devries was elected one of 125 extraordinary university of texas ex-graduates for the university's 125th anniversary; in 2012, the main-belt minor planet 89131 phildevries was named in devries' honor by astronomer bill yeung. | wikipedia |
a3e751bb7911f99f210d2e0e2c3353e58d41cfbb | he is presently a professor at the university | he is presently a professor at the university of new orleans in louisiana, along with his wife and close colleague carla penz. devries continues to study long-term butterfly community diversity, and speciation. his butterfly trapping methods are used widely in tropical diversity studies and conservation efforts. he als... | wikipedia |
8fb5f7593b38a6b60d2337bc44f3f6b8c4f60032 | devries was an assistant professor at the university | devries was an assistant professor at the university of oregon (1994–2000), where he developed trapping methods to accrue long-term data sets on tropical butterfly communities. work with his colleague russell lande produced some of the first rigorous insights into the spatial and temporal dynamics of diverse rainforest... | wikipedia |
81694ff411166534f9a41ad6169f6d24a30f8741 | he was a pre-doctoral (1985–1986) and post-doctoral fellow | he was a pre-doctoral (1985–1986) and post-doctoral fellow (1987–1988) at the smithsonian tropical research institute, panama, a visiting scholar at the university of oxford, uk (1990–1991), an associate of the center for conservation biology at stanford university (1990–1992), and a geraldine r. dodge foundation fello... | wikipedia |
8b7bd92f1c293e86617711feaed037cdf902669f | in 1988, devries received a macarthur fellowship that | in 1988, devries received a macarthur fellowship that allowed him to travel broadly in pursuit of tropical biology in costa rica, panama, ecuador, and argentina. through the macarthur fellows program, he became close friends with the artists lee friedlander, steve lacy, john t. scott, brad leithauser, and the historian... | wikipedia |
d8275fb32a0853436c308489f498ec9da857070d | devries attended the university of texas at austin | devries attended the university of texas at austin from 1980 to 1987, where he earned a phd in zoology. his doctoral work focused on the widespread symbioses between butterfly caterpillars, ants and plants, which he popularized under the nickname " singing caterpillars ". in 1982, devries received a fellowship from the... | wikipedia |
a1689fbc71fcda276efb9c38b60c19dbf5614df8 | from 1975 to 1980, he was a curator | from 1975 to 1980, he was a curator of lepidoptera at the museo nacional de costa rica as a peace corps volunteer where he built the country's first major butterfly collection. devries traveled widely in costa rica, collecting and making observations on butterflies. this eventually provided a large body of information ... | wikipedia |
8aeb0ff6b68f780cd4a9137520d41d6055b92b1a | devries was born in detroit, michigan to henry | devries was born in detroit, michigan to henry william devries and helen mary devries (née brnabic). his early interest in biology was nourished by close contact with nature during his childhood in rural michigan. as an undergraduate student at the university of michigan, ann arbor, devries was mentored in botany by pr... | wikipedia |
dee51fb3e44e9dc7e954d1a5006089d2e950a0e6 | philip james devries (born march 7, 1952) is | philip james devries (born march 7, 1952) is a tropical biologist whose research focuses on insect ecology and evolution, especially butterflies. his best-known work includes symbioses between caterpillars, ants and plants, and community level biodiversity of rainforest butterflies. devries is professor emeritus at the... | wikipedia |
1ff1cf0d0d8316d9b9ac6559fe74bccbfd33c084 | polyacetylene usually refers to an organic polymer with | polyacetylene usually refers to an organic polymer with the repeating unit [c2h2]n. the name refers to its conceptual construction from polymerization of acetylene to give a chain with repeating olefin groups. this compound is conceptually important, as the discovery of polyacetylene and its high conductivity upon dopi... | wikipedia |
6c413b363178d4bb67fc8890c36e3d04a109c6ff | polyacetylene has no commercial applications, although the discovery | polyacetylene has no commercial applications, although the discovery of polyacetylene as a conductive organic polymer led to many developments in materials science. conducting polymers are of interest for solution-processing for film-forming conductive polymers. therefore, attention has shifted to other conductive poly... | wikipedia |
fe3ebd4486fdf4ad675a84956bd6ed09bf1b9a7a | for applications, polyacetylenes suffer from many drawbacks. they | for applications, polyacetylenes suffer from many drawbacks. they are insoluble in solvents, making it essentially impossible to process the material. while both cis and trans -polyacetylene show high thermal stability, exposure to air causes a large decrease in the flexibility and conductivity. when polyacetylene is e... | wikipedia |
e2521777022e503d80644ec56b0e1414d8f9bc48 | the synthesis and processing of polyacetylene films affects | the synthesis and processing of polyacetylene films affects the properties. increasing the catalyst ratio creates thicker films with a greater draw ratio, allowing them to be stretched further. lower catalyst loadings leads to the formation of dark red gels, which can be converted to films by cutting and pressing betwe... | wikipedia |
d2394b9de00666e64b147257ec2b7311853d405c | the structure of polyacetylene films have been examined | the structure of polyacetylene films have been examined by both infrared spectroscopy and raman spectroscopy, and found that the structure depends on synthetic conditions. when the synthesis is performed below −78 °c, the cis form predominates, while above 150 °c the trans form is favored. at room temperature, the poly... | wikipedia |
70634be9217f70e88eb1c23379a9f07b5f58ab8c | the conductivity of polyacetylene depends on structure and | the conductivity of polyacetylene depends on structure and doping. undoped trans -polyacetylene films have a conductivity of 4.4×10 Ω cm, while cis -polyacetylene has a lower conductivity of 1.7×10 Ω cm. doping with bromine causes an increase in conductivity to 0.5 Ω cm, while a higher conductivity of 38 Ω cm is obtain... | wikipedia |
c3d841801d7def1a116089eeb6f644261c851f58 | electron-donating (n-type) dopants can also be used to | electron-donating (n-type) dopants can also be used to create conductive polyacetylene. n-type dopants for polyacetylene include lithium, sodium, and potassium. as with p-type dopants, charge-transfer complexes are created, where the polymer backbone is anionic and the donor is cationic. the increase in conductivity up... | wikipedia |
d6d0eb8135bdc7b1dc729c045a7172c7b0fa3fb5 | when polyacetylene films are exposed to vapors of | when polyacetylene films are exposed to vapors of electron-accepting compounds (p-type dopants), the electrical conductivity of the material increases by orders of magnitude over the undoped material. p-type dopants include br, i, cl, and asf. these dopants act by abstracting an electron from the polymer chain. the con... | wikipedia |
b82d7a05ffcbd74d23bfa403fab1483221114473 | more efficient methos for synthesizing long polyacetylene chains | more efficient methos for synthesizing long polyacetylene chains exist and include the durham precursor route in which precusor polymers are prepared by ring-opening metathesis polymerization, and a subsequent heat-induced reverse diels–alder reaction yields the final polymer, as well as volatile side products. | wikipedia |
9d846d6d2defb493a9e822fa592b77008be3bbc1 | polyacetylene can also be synthesized from other polymers. | polyacetylene can also be synthesized from other polymers. this method enables modification and processing of the polymer before conversion into the highly insoluble polyacetylene. short, irregular segments of polyacetylene can be obtained by dehydrohalogenation of poly(vinyl chloride): | wikipedia |
bdc53872c61adf7abb21d976e86a21c49f8325d5 | polyacetylene can be synthesized by ring-opening metathesis polymerisation | polyacetylene can be synthesized by ring-opening metathesis polymerisation (romp) from cyclooctatetraene, a material easier to handle than the acetylene monomer. this synthetic route also provides a facile method for adding solubilizing groups to the polymer while maintaining the conjugation. robert grubbs and coworker... | wikipedia |
62dbf9efc63f22b4ad13205a8d711d471d9f6eff | polyacetylene can also be produced by radiation polymerization | polyacetylene can also be produced by radiation polymerization of acetylene. glow-discharge radiation, gamma radiation, and ultraviolet irradiation have been used. these methods avoid the use of catalysts and solvent, but require low temperatures to produce regular polymers. gas-phase polymerization typically produces ... | wikipedia |
63bbbdb9fd18e84d6fe15165e3b654cfaebe83d8 | by varying the apparatus and catalyst loading, shirakawa | by varying the apparatus and catalyst loading, shirakawa and coworkers were able to synthesize polyacetylene as thin films, rather than insoluble black powders. they obtained these films by coating the walls of a reaction flask under inert conditions with a solution of the ziegler–natta catalyst and adding gaseous acet... | wikipedia |
7e5ded58114be10d8ab352a05f0e8937a0d7fea9 | a variety of methods have been developed to | a variety of methods have been developed to synthesize polyacetylene. one of the most common methods is via passing acetylene gas over a ziegler–natta catalyst, such as ti(o i pr) / al(c h). this method allows control over the structure and properties of the final polymer by varying temperature and catalyst loading. me... | wikipedia |
2b585a81bf74923c2bd4ae66ae6ede96c378cad1 | to account for such an increase in conductivity | to account for such an increase in conductivity in polyacetylene, j. r. schrieffer and heeger considered the existence of topologically protected solitonic defects, their model is now known as the su–schrieffer–heeger model, which has served as model in other contexts to understand topological insulators. | wikipedia |
cb97987742cf92be1e3d54e346c3c0193b2dd617 | upon doping polyacetylene with i, the conductivity increased | upon doping polyacetylene with i, the conductivity increased seven orders of magnitude. similar results were achieved using cl and br. these materials exhibited the largest room temperature conductivity observed for a covalent organic polymer, and this seminal report was key in furthering the development of organic con... | wikipedia |
68380c9207eda67f3dc19ddb5e0bb27a90fa5ef6 | the next major development of polyacetylene polymerization was | the next major development of polyacetylene polymerization was made by hideki shirakawa ’s group who were able to prepare silvery films of polyacetylene. they discovered that the polymerization of polyacetylene could be achieved at the surface of a concentrated solution of the catalyst system of et al and ti(obu) in an... | wikipedia |
f64e69f9a1e4c1df6a46c933db2dfe9b2be4c5ee | one of the earliest reported acetylene polymers was | one of the earliest reported acetylene polymers was named cuprene. its highly cross-linked nature led to no further studies in the field for quite some time. linear polyacetylene was first prepared by giulio natta in 1958. the resulting polyacetylene was linear, of high molecular weight, displayed high crystallinity, a... | wikipedia |
a0263e3494ddab4308bad92b02309dc8f94c63dc | polyacetylene consists of a long chain of carbon | polyacetylene consists of a long chain of carbon atoms with alternating single and double bonds between them, each with one hydrogen atom. the double bonds can have either cis or trans geometry. the controlled synthesis of each isomer of the polymer, cis -polyacetylene or trans -polyacetylene, can be achieved by changi... | wikipedia |
76966560fd0cafd95413c9b327854b674c0d4acb | compounds called polyacetylenes also occur in nature, although | compounds called polyacetylenes also occur in nature, although in this context the term refers to polyynes, compounds containing multiple acetylene groups ("poly" meaning many), rather than to chains of olefin groups ("poly" meaning polymerization of). | wikipedia |
59b52e5dc286d1def75c7aabdb1ab831fd8e768b | polyacetylene (iupac name: polyethyne) usually refers to an | polyacetylene (iupac name: polyethyne) usually refers to an organic polymer with the repeating unit. the name refers to its conceptual construction from polymerization of acetylene to give a chain with repeating olefin groups. this compound is conceptually important, as the discovery of polyacetylene and its high condu... | wikipedia |
146e5816f4833a340ad806b7948903ee5ca8eb2e | houman owhadi is a professor of applied and | houman owhadi is a professor of applied and computational mathematics and control and dynamical systems in the computing and mathematical sciences department at the california institute of technology. he is known for his work in statistical numerical approximation, kernel learning, and uncertainty quantification. | wikipedia |
ecf9468ad24ddfca632adc78bd1333a335fd402b | owhadi won the epfl doctorate award for his | owhadi won the epfl doctorate award for his thesis in 2001. he was an invited lecturer at the siam conference on computational science and engineering in 2015 and a plenary speaker at the xvi international conference on hyperbolic problems. in 2019, he received the siam germund dahlquist prize. he was elected a siam fe... | wikipedia |
9f2a8d6b63a82ae1779a318951a48c0649362eda | owhadi studied at the École polytechnique where he | owhadi studied at the École polytechnique where he received a m.s. in mathematics and physics in 1994 and was a civil servant in the corps des ponts in 1997. he received his ph.d. in mathematics from the École polytechnique fédérale de lausanne in 2001, studying under gérard ben arous. he was a cnrs research fellow bet... | wikipedia |
146e5816f4833a340ad806b7948903ee5ca8eb2e | houman owhadi is a professor of applied and | houman owhadi is a professor of applied and computational mathematics and control and dynamical systems in the computing and mathematical sciences department at the california institute of technology. he is known for his work in statistical numerical approximation, kernel learning, and uncertainty quantification. | wikipedia |
5534aa3ba8226b1079e9d9f41d9a06ed2d3d982f | buellia stellulata, an epilithic lichen, thrives on siliceous | buellia stellulata, an epilithic lichen, thrives on siliceous rock surfaces (typically hcl-) and is commonly found in coastal regions. however, its habitat is not restricted solely to seashore environments. | wikipedia |
06008b192b089d11940882c6f2211f1d0d7c5c13 | the lichen contains the secondary metabolites atranorin, 2'-o-methylperlatolic | the lichen contains the secondary metabolites atranorin, 2'-o-methylperlatolic acid, and confluentic acid. spot tests are k+ yellow (sometimes weak), p- or + faintly yellow, c-, kc-, and ck-. uv fluorescence is -(dark). | wikipedia |
7a71a9d6e680e32117fbc54386b1f668a5663557 | the asci are clavate, bacidia -type, and 8-spored. | the asci are clavate, bacidia -type, and 8-spored. the ascospores soon become brown, 1-septate, oblong to ellipsoid, usually not constricted, with obtuse ends, and not curved, measuring (8-)8.7--11.1(-13) x (4.5-)4.8--6.1(-7) μm. the proper septum is narrow and does not thicken during spore ontogeny (buellia-type). the... | wikipedia |
c179b7aa348f49e2bceb2c34023f810708f86b62 | the apothecia exhibit a lecideine structure, with a | the apothecia exhibit a lecideine structure, with a diameter ranging from (0.2-)0.3-0.4(-0.5) mm. they are typically immersed to adnate, occasionally found in a sessile form. the margin may appear black or masked by grayish remnants of necrotic thalline material, forming a thin and usually persistent boundary, occasion... | wikipedia |
18c7a5bd84952599629db9a1c19a29b094db16fb | the thallus is crustose, areolate, and thin to | the thallus is crustose, areolate, and thin to moderately thickened, often forming a continuous layer. the prothallus is conspicuous and black, strongly developed in most specimens, growing between the areoles to form a hypothallus. the thallus surface is usually white to whitish gray, rarely dark gray, and can be dull... | wikipedia |
6d7909a80ff101ddb7409c34890dfd11c6a73c9a | verstraete and verstraeten are dutch language toponymic surnames. | verstraete and verstraeten are dutch language toponymic surnames. the names are contractions of van der straate(n), meaning "from the street". "verstraete is mostly limited to west flanders while "verstraeten" is mostly limited to east flanders. notable people with the surname include: birger verstraete, belgian footba... | wikipedia |
25e87fc05a6d5c7ba4b5ddd35bd109decae5e4f1 | verstraete and verstraeten are dutch language toponymic surnames. | verstraete and verstraeten are dutch language toponymic surnames. the names are contractions of van der straate(n), meaning "from the street". "verstraete (6,633 people in belgium in 2007) is mostly limited to west flanders while "verstraeten" (5,511 people) is mostly limited to east flanders. notable people with the s... | wikipedia |
7ab9606758c232fa82a37e812c241f013e765c16 | eugene daniel berce was an american basketball player. | eugene daniel berce was an american basketball player. he played collegiately for the cornell big red and what are now the marquette golden eagles. he was selected by the new york knicks in the 1948 baa draft. he played for the tri-cities blackhawks (1949–50) in the nba for 3 games. he was the first marquette player to... | wikipedia |
4959f64c248aa6f265e99573a282d72fcd179811 | he was selected by the new york knicks | he was selected by the new york knicks in the 1948 baa draft. he played for the tri-cities blackhawks (1949–50) in the nba for 3 games. he was the first marquette player to score 1,000 career points, and is in the marquette hall of fame. | wikipedia |
bb64fb5723c4871d1904eb3cfb3c092aea81992e | eugene daniel berce (november 22, 1926 – november | eugene daniel berce (november 22, 1926 – november 17, 2018) was an american basketball player. he played collegiately for the cornell big red and what are now the marquette golden eagles. | wikipedia |
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