Sample records for titana soderzhashchikh vyazkuyu
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Energy Technology Data Exchange (ETDEWEB)
Khokhlov, V A; Novoselova, A V; Nikolaeva, E V; Tkacheva, O Yu; Salyulev, A B [Inst. Vysokotemperaturnoj Ehlektrokhimii UrO RAN, Ekaterinburg (Russian Federation)
2007-08-15
Rare earth (REM, Ln) solutions in chloride melts including MCI+LnCl{sub 3} mixtures, where M - alkali metals, were investigated by potentiometry, voltammetry, conductometry in wide concentration and temperature intervals. Findings present complete and trusty information on the valent state of rare earths, structure and composition of complex ions affecting essentially on properties of electrolytes. It is demonstrated that the coexistence of rare earth ions with different oxidation level formed as a result of possible redox reactions: 2Ln{sup 3+} + Ln {r_reversible}3Ln{sup 2+}, Ln{sup 2+} + Ln{r_reversible}2Ln{sup +} and nM{sup +} + Ln{r_reversible}nM + Ln{sup n+} appears sharply in thermodynamic and transport properties of molten Ln-LnCl{sub 3} and Ln-LnCl{sub 3}-MCl systems.
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Faleev, N G; Ruvinov, S B; Saporovskaya, M B; Belikov, V M; Zakomyrdina, L N; Sakharova, I S; Torchinskij, Yu M [AN SSSR, Moscow (USSR). Inst. Ehlementoorganicheskikh Soedinenij AN SSSR, Moscow (USSR). Inst. Molekulyarnoj Biologii AN SSSR, Moscow (USSR)
1989-10-01
Method for preparation of a series of {alpha}-deuterated L-amino acids of high optical purity with quantitative chemica yield, suing stereospecific isotopic exchange in D{sub 2}O under the effect of E.coli cells with high tryptophanase activity was developed.
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Lloyd, H. [Atomic Energy Research Establishment, Harwell (United Kingdom)
1963-11-15
de nucleos de cermets constituidos por placas con las particulas uniformemente distribuidas en la matriz de acero inoxidable, asi como procedimientos para unir las placas de combustible por laminacion en caliente. Se ha estudiado la laminacion a temperaturas de hasta 1300{sup o}C, utilizando deformaciones totales del orden del 40 al 90%, para determinar las condiciones optimas de produccion de nucleos de elevada densidad y obtener una union satisfactocia entre los componentes de las placas, con fragmentacion y estiraje minimos de las particulas de UO{sub 2} . Tambien se describe la fabricacion de grandes placas de combustible utilizando materiales polinucleares que se unen por laminacion en caliente. Se facilitan datos sobre las propiedades mecanicas de cermets de UO{sub 2} y acero inoxidable de 30, 40 y 50% en volumen, elaborados como se ha indicado y ensayados tal como quedan despues de laminarlos, y despues de someterlos a recocido a diversas temperaturas que alcanzaron hasta 700{sup o}C, utilizando probetas tomadas transversal y longitudinalmente con respecto a la direccion de laminado. Se examina la influencia del tamaflo y uniformidad de la distribucion de las esferas de UO{sub 2} en la estabilidad de las propiedades mecanicas. Tambien se evalua la solidez de la union entre el nucleo y el revestimiento de cermets del mismo tipo, en identico intervalo de temperaturas. Asimismo, se incluyen los resultados de los ensayos de ciclado termico efectuados entre 50 y 800{sup o}C con objeto de estudiar los efectos en la estructura del cermet y en la estabilidad de la union, despues de 100, 500 y 1000 ciclos. (author) [Russian] Daetsya opisanie protsessov izgotovleniya toplivnykh ehlementov plastinchatogo tipa iz UO{sub 2} i nerzhaveyushchej stali, soderzhashchikh do 50 ob% UO{sub 2}. Opisyvaetsya izgotovlenie ochen' plotnykh spekshikhsya sharoobraznykh chastits iz UO{sub 2} v intervale razmerov ot 100 do 500, a takzhe pressovanie i spekanie kermetnykh plastinchatykh
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Goh, Gregory Kia Liang [Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology, and Research), 3 Research Link, 117602 Singapore (Singapore); Le, Hong Quang, E-mail: lehq@imre.a-star.edu.sg [Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology, and Research), 3 Research Link, 117602 Singapore (Singapore); Huang, Tang Jiao; Hui, Benjamin Tan Tiong [Department of Materials Science and Engineering (DMSE), Faculty of Engineering National University of Singapore (NUS) BLK E3A, #04-10, 7 Engineering Drive 1, Singapore 117574 (Singapore)
2014-06-01
High aspect ratio ZnO nanorod arrays were synthesized on fluorine-doped tin oxide glasses via a low temperature solution method. By adjusting the growth condition and adding polyethylenimine, ZnO nanorod arrays with tunable length were successfully achieved. The ZnO@TiO{sub 2} core shells structures were realized by a fast growth method of immersion into a (NH{sub 4}){sub 2}·TiF{sub 6} solution. Transmission electron microscopy, X-ray Diffraction and energy dispersive X-ray measurements all confirmed the existence of a titania shell uniformly covering the ZnO nanorod's surface. Results of solar cell testing showed that addition of a TiO{sub 2} shell to the ZnO nanorod significantly increased short circuit current (from 4.2 to 5.2 mA/cm{sup 2}), open circuit voltage (from 0.6 V to 0.8 V) and fill factor (from 42.8% to 73.02%). The overall cell efficiency jumped from 1.1% for bare ZnO nanorod to 3.03% for a ZnO@TiO{sub 2} core shell structured solar cell with a 18–22 nm shell thickness, a nearly threefold increase. - Graphical abstract: The synthesis process of coating TiO{sub 2} shell onto ZnO nanorod core is shown schematically. A thin, uniform, and conformal shell had been grown on the surface of the ZnO core after immersing in the (NH{sub 4}){sub 2}·TiF{sub 6} solution for 5–15 min. - Highlights: • ZnO@TiO{sub 2} core shell nanorod has been grown on FTO substrate using low temperature solution method. • TEM, XRD, EDX results confirmed the existing of titana shell, uniformly covered rod's surface. • TiO{sub 2} shell suppressed recombination, demonstrated significant enhancement in cell's efficiency. • Core shell DSSC's efficiency achieved as high as 3.03%, 3 times higher than that of ZnO nanorods.
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Changes of vitamin C content in celery and parsley herb after processing
Directory of Open Access Journals (Sweden)
Magdaléna Valšíková
2016-12-01
Full Text Available Humans and other primates have lost the ability to synthesize vitamin C and therefore the only source is diet. Vitamin C or ascorbic acid has labile nature, it is removed or destroyed in specific degree immediately after harvest, but storage and post - harvest processing also contribute to its degradation. The aim of work was to determine the vitamin C content in the herb of selected celery and parsley varieties in dependence on chosen postharvest processing and to compare it with fresh herb. There were chosen five bulb forms varieties of celery (Apium graveolens - Makara, Ilonaa, Hegy Köi, Talar and Diamant. In case of parsley (Petroselinum crispum there were evaluated one variety of curly parsley, one variety of herb parsley - Petra, and five varieties of root parsley - Lenka, Eagle, Ginate D´Italia, Titana and Arat. Every variety was harvested in three terms, followed by vitamin C content estimation in fresh herb, after drying and after freezing. The content of vitamin C was estimated by HPLC method by the help of liquid chromatograph with UV detector. There was found the significant difference in content of vitamin C in parsley as well as in celery when comparing the fresh herb with herbs after post - harvest processes - drying (by air circulation in laboratory hall and freezing. After processing of herbs in both observed species the vitamin C content decreased, in case of freezing it was about 65% (celery and 61% (parsley, after drying about 86% (celery and 82% (parsley in comparison with fresh herb. The effect of processing played more important role in influencing of vitamin C content than variety in case of both selected species. For using of celery and parsley not only as culinary herb, but as a notable source of ascorbic acid it is the most important fresh herb intake. Normal 0 21 false false false EN-GB X-NONE X-NONE
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Taskaev, E [Kombinat Atomna Energetika, Kozloduj (Bulgaria); Penev, I; Taskaeva, M [Bylgarska Akademiya na Naukite, Sofia (Bulgaria). Inst. za Yadrena Izsledvaniya i Yadrena Energetika; Aleksieva, L [Sofia Univ. (Bulgaria); Tsokov, P [Kombinat Atomna Energetika, Kozloduj (Bulgaria)
1996-12-31
An analysis of reactor steel composition has been carried out in 1989 in order to determine metal embrittlement. The samples consist of shavings taken at 3-4 mm depth from the 4-th welded joint of Unit 1 of the Kozloduy NPP. The shavings have been gradually dissolved in a mixture of acids and the solution evaporated. Quantitative analysis has been carried out by spectrophotometry and by ICP emission spectroscopy. The following element concentrations have been found: P - from 0.0462 to 0.052% by weight; Ni - 0.25 - 0.26% (passport data 0.29%); Cr - 1.47 - 1.54 (passport 1.58%); V - 0.1% (passport 0.15%); Cu - 0.11-0.13% (passport 0.12); Ti - 0.002. The data have been used to calculate metal embrittlement. 4 refs., 8 tabs.
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Bokshtejn, S Z; Gubareva, M A; Kishkin, S T; Moroz, L M
1962-01-15
rekristallizatsii, a takzhe posle polimorfnogo {alpha} {r_reversible} {gamma} prevrascheniya, atomy granits iskhodnykh zeren ne smeshchayutsya na znachitel'nye rasstoyaniya. Analogichno, atomy primesi (radioaktivnyj uglerod), raspolozhennye na granitsakh iskhodnogo zerna, ne perekhodyat na granitsy novykh zeren rekristallizovannogo metalla. V otlichie ot ehtogo plasticheskaya deformatsiya soprovozhdaetsya znachitel'nym peremeshcheniem atomov, raspolozhennykh na granitse zerna. Poluchennye dannye pokazyvayut, chto peremeshchenie granits zeren pri rekristallizatsii i pri posleduyushchem roste zeren svyazano s nekotorym spetsificheskim mekhanizmom, otlichnym ot obychnogo diffuzionnogo. Pokazano, chto strukturnye izmeneniya, protekayushchie v splavakh pri vysokikh temperaturakh, mogut izmenyat' skorost' protsessov samodiffuzii i geterodiffuzii. V rezul'tate issledovaniya diffuzionnykh protsessov v titane i ego splavakh v zavisimosti ot polimorfnogo sostoyaniya ustanovleno, chto skorost' protsessa v razlichnykh kristallicheskikh modifikatsiyakh titana sil'no otlichaetsya. EHtim snimaetsya sushchestvovavshee protivorechie mezhdu vysokoj temperaturoj plavleniya titana i otnositel'no nizkoj ehnergiej aktivatsii protsessa diffuzii v titane. (author)
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Campbell, R B; Grunberg, L [National Engineering Laboratory, East Kilbride, Glasgow (United Kingdom)
1962-01-15
, los autores han tenido en cuenta la estructura de los materiales empleados y los procesos de difusion a los que se debe el progreso de la reaccion una vez iniciada esta. (author) [Russian] Protivoiznosnoe dejstvie sernykh i fosfornykh soedinenij, kotorye obychno dobavlyayutsya k mashinnym maslam, zavisit ot khimicheskikh reaktsij s metallicheskimi poverkhnostyami shesterenok. EHti reaktsii imeyut mesto kak pri osnovnoj temperature masel (primerno 100 Degree-Sign C), tak i pri vysokikh temperaturakh (priblizitel'no 600 Degree-Sign C) v techenie nebol'shogo promezhutka vremeni, kogda zubtsy shesterenok vstupayut vo vzai-modejstvie pod nagruzkoj. Temperaturnye izmeneniya sozdavalis' v apparate, v kotorom korotkie impul'sy ehlektrotoka ispol'zovalis' dlya nagrevaniya metallicheskikh provodov, pogruzhennykh v mineral'noe maslo, soderzhashchee v rastvore mechenye soedineniya sery-35 i fosfora-32. Zameryalas' voznikavshaya v provodakh radioaktivnost'. Stepen' reaktsii opredelyalas' kak funktsiya temperatury i vremeni. Rezul'taty reaktsii vyrazhalis' posredstvom osnovnykh zakonov kinetiki. Izucheniyu podverglis' voprosy izmeneniya skorosti reaktsii v zavisimosti ot nalichiya drugikh sostavov v rastvore. Bylo takzhe opredeleno vliyanie predvaritel'no obrazovannykh pokrytij poverkhnosti, soderzhashchikh seru, fosfor, khlor i/ili kislorod. Dlya ob{sup y}asneniya rezul'tatov raboty ispol'zuyutsya dannye o strukture materialov, a takzhe rassmatrivayutsya protsessy diffuzij tam, gde reaktsii vykhodili za svoi nachal'nye stadii. (author)
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Kudahl, J N; Fremlin, J H; Hardwick, J L [Department of Physics, University of Birmingham (United Kingdom)
1962-01-15
des matieres organiques peuvent etre reduites en cendres en toute securite si des ions de calcium ou de magnesium sont presents. La precision de la methode ne depend pas de la concentration du fluorure jusqu'a concurrence de valeurs representant une fraction d'une ppm. (author) [Spanish] El vidrio adsorbe los iones fluoruro de las soluciones acidas, y si estas soluciones contienen menos de 100 ppm de fluor, la cantidad adsorbida varia muy regularmente en funcion de la concentracion. El metodo empleado por los autores consiste en anadir a cada uno de los integrantes ele una serie de soluciones acidas, que pueden contener unos miligramos, o menos, de fluoruro, un cierto volumen de una solucion del isotopo inestable {sup 18}F libre de portador. Si estas soluciones se aplican a un area determinada de vidrio, parte del {sup 18}F es adsorbida y puede ser fijada elevando el pH una vez alcanzado el equilibrio. La radiactividad del vidrio constituye una medida de la cantidad total de fluoruro presente sobre el vidrio, y puede utilizarse para trazar una isotermia de adsorcion de la cual se puede deducir el contenido en fluor de una solucion desconocida de la serie. Luego de estudiar los efectos del pH de la presencia de iones calcio y fosfato, los autores ban comprobado que las sustancias organicas pueden ser calcinadas sin peligro alguno siempre que se encuentreu presentes iones calcio o magnesio. La precision del metodo no depende de la concentracion de fluoruro siempre que esta sea inferior a 1 ppm. (author) [Russian] Ion ftora iz kislotnogo rastvora adsorbiruetsya na steklo, i dlya rastvorov, soderzhashchikh menee 100 chastej ftora na million, adsorbiruemoe kolichestvo izmenyaetsya ochen' regulyarno v zavisimosti ot kontsentratsii. K kazhdomu iz kislotnykh rastvorov ftora v dannoj serii, ne prevyshayushchikh po vesu neskol'kikh milligrammov, a to i men'she, dobavlyaetsya nekotoryj ob{sup e}m svobodnogo ot nositelej rastvora neustojchivogo izotopa F{sup 18}. Esli rastvory
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Forte, M; Konsta, A; Maranzana, C [European Atomic Energy Community, CCR, ISPRA (Italy)
1962-04-15
hasta impulsos debiles, de unas cuantas decenas de fotoelectrones, y la discriminacion de fragmentos emitidos por captura neutronica en liquidos conteniendo boro. Algunas de estas redes fueron capaces de operar con impulsos de la misma polaridad emitidos por dos de los ultimos dinodos, incluso con la salida de un solo electrodo. Ello puede ser util cuando conviene emplear el anodo independientemente, por ejemplo, para sincronizacion. (author) [Russian] Kak uzhe soobshchalos' ran'she, forma stsintillyatsionnogo impul'sa, kharakterizuyushchaya tip vozbuzhdayushchej chastitsy (ehlektron, proton, al'fa i t.d.), mozhet byt' prevrashchena v nezavisimyj ot amplitudy impul'sa parametr. EHto pozvolyaet vyyavit' posredstvom mnogokanal'nogo analizatora sostav vozbuzhdayushchego stsintillyator puchka so smeshannymi chastitsami. EHtot metod byl uspeshno primenen k neskol'kim stsintillyatoram kak organicheskogo, tak i neorganicheskogo tipa. Privodyatsya detali ehlektronnykh metodik, ispol'zovannykh dlya preobrazovaniya formy impul'sov. Dlya bolee prostykh sluchaev diskriminatsii tol'ko mezhdu dvumya vidami impul'sov (naprimer, diskriminatsiya nejtronov ot gamma-izluchenij) rassmatrivalas' takzhe vozmozhnost' ispol'zovaniya passivnykh skhem, predstavlyayushchikhsya perspektivnymi dlya dal'nejshikh usovershenstvovanij i uproshchenij. Bylo isprobovano neskol'ko skhem, glavnym rezul'tatom chego bylo to, chto pri nalichii fona gamma-izlucheniya udalos' rasprostranit' diskriminatsiyu protonov otdachi v zhidkikh stsintillyatorakh na malye impul'sy vsego lish' v neskol'ko desyatkov fotoehlektronov, a takzhe dobit'sya diskriminatsii oskolkov zakhvata nejtronov v soderzhashchikh bor zhidkostyakh. Nekotorye iz ehtikh skhem byli prednaznacheny dlya raboty s impul'sami odinakovoj polyarnosti, podavaemymi dvumya poslednimi ehlektrodami umnozhitelya, ili dazhe s vykhodnymi impul'sami odnogo lish' ehlektroda. EHto mozhet okazat'sya poleznym pri nezavisimom ispol'zovanii anoda, naprimer, dlya
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Energy Technology Data Exchange (ETDEWEB)
Kuzminsky, A S; Nikitina, T S; Oksentevich, L A [Rubber Research Institute, Moscow, Union of Soviet Socialist Republics (Russian Federation)
1960-07-15
temperaturas (150{sup o}, 200{sup o} y 250{sup o}). La irradiacion permite disminuir la temperatura de vulcanizacion y prescindir de un almacenamiento prolongado a temperatura regulada, que de otro modo es necesario despues de la vulcanizacion. El negro de humo puede utilizarse como material de carga para el caucho vulcanizado con arreglo al nuevo metodo. Los autores llegan a la conclusion de que el empleo de las radiaciones ionizantes se traduce en una simplificacion de la tecnologia de la vulcanizacion del caucho de siliconas y en un mejoramiento de las propiedades de los productos obtenidos. (author) [Russian] Osnovnaya tsel' raboty - podrobnoe izuchenie svojstv materialov, poluchaemykh v rezul'tate oblucheniya smesej polidimetil-siloksanovogo kauchuka s razlichnymi napolnitelyami (spetsial'naya kremnekislota, dvuokis' titana, kanal'naya, pechnaya i lampovaya sazha). Obluchenie provodilos' na moshchnoj rentgenovskoj ustanovke i na istochnike {gamma}-izlucheniya So{sup 60} aktivnost'yu 20 000 g-ehkv. radiya. Otsenena otnositel'naya skorost' obrazovaniya prostranstvennoj setki vulkanizatov (po velichine ravnovesnogo modulya i maksimal'noj stepeni nabukhaniya v benzole). Rassmotreno izmenenie soprotivleniya razryvu i otnositel'nogo udlineniya v protsesse oblucheniya. Vybrany optimal'nye rezhimy vulkanizatsii i opredeleny osnovnye fiziko-mekhanicheskie pokazateli vulkanizatov. Issledovano izmenenie svojstv radiatsionnykh vulkanizatov v protsesse teplovogo stareniya pri razlichnykh temperaturakh (150, 200 i 250{sup o}). Radiatsionnaya vulkanizatsiya isklyuchaet neobkhodimost ' provedeniya protsessa pri vysokikh temperaturakh i dlitel'noe termostatirovanie posle vulkanizatsii . Novyj sposob vulkanizatsii pozvolyaet primenyat' v kachestve napolnitelej uglerodnye sazhi. Ispol'zovanie ioniziruyushchikh izluchenij pozvolyaet uprostit' tekhnologiyu vulkanizatsii silikonovogo kauchuka i uluchshit' svojstva vulkanizatov. (author)
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Grimes, W R; Shaffer, J H; Strehlow, R A; Ward, W T; Watson, G M [Oak Ridge National Laboratory, Oak Ridge, TN (United States)
1962-03-15
produce un aumento de la concentracion de radioisotopos en la solucion, de conformidad con la ley de accion de masas. Cuando se enfrian ciertas mezclas de LiF y BeF{sub 2} fundidas que contengan CeF{sub 3} y fluoruros de las tierras raras, la fase primaria consiste en una solucion solida de los trifluoruros. Los autores han evaluado los equilibrios entre la solucion fundida y la solucion solida, para diversos pares de fluoruros. No han observado ninguna desviacion notable respecto de la ley de accion de masas. Los autores logran la separacion de diversas especies por precipitacion selectiva de los oxidos a partir de soluciones de fluoruros fundidos. (author) [Russian] Putem ispol'zovaniya sootvetstvuyushchikh radioizotopov i standartnykh metodov otscheta byli izucheny khimicheskie reaktsii, kotorye mogut okazat'sya poleznymi dlya udaleniya nekotorykh sostavnykh chastej iz rasplavlennykh ftoristykh rastvorov. Byli izucheny sleduyushchie kategorii reaktsij: 1) izotopnyj obmen mezhdu rastvorennym indikatorom i nerastvorimymi slozhnymi veshchestvami; 2) raspredelenie rastvorennogo indikatora mezhdu rasplavom i rastvorom analogichnogo slozhnogo veshchestva v tverdom sostoyanii i 3) osazhdenie radioizotopa v kachestve nerastvorimogo slozhnogo veshchestva. V tipichnykh ehksperimentakh nablyudalos', chto radioaktivnyj indikator LaF{sub 3} v rasplavakh LiF-NaF bystro obmenivaetsya na neaktivnyj La{sub 2}O{sub 3}. V ehtom rastvoritele analogichnyj bystryj obmen proiskhodit mezhdu radioaktivnym indikatorom CeF{sub 3} i neaktivnym CeO{sub 2}; trebuemoe v poslednem sluchae perenesenie ehlektrona ochevidno ne prepyatstvuet ehtoj reaktsii. V sootvetstvii s printsipom massovogo dejstviya dobavlenie k kazhdoj iz ehtikh sistem neaktivnogo CeF{sub 3} uvelichivalo soderzhanie radioaktivnogo indikatora v rastvore. Pri okhlazhdenii nekotorykh rasplavov ZiF-BeF{sub 2}, soderzhashchikh CeF{sub 3}, i redkikh zemel' v kachestve pervichnoj fazy obrazuetsya tverdyj rastvor triftoristykh soedinenij
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Energy Technology Data Exchange (ETDEWEB)
Gal, D [Central Isotope Laboratory, University of Szeged (Hungary); Guczi, L [Department of Radiology, Elelmiszeripari Kutato Intezet, Budapest (Hungary)
1962-03-15
comparacion de esos resultados con otros datos cineticos, se puede demostrar que la autooxidacion del acido mercaptoacetico en fase liquida constituye una reaccion en cadena ramificada, una de cuyas ramas principales es la formacion de Na{sub 2}S y su oxidacion subsiguiente. Los autores tambien comprobaron que el sulfato que aparece durante la reaccion, procede exclusivamente del sulfuro inorganico. El hierro cataliza la formacion de disulfuro organico y, por lo tanto, ejerce tambien influencia sobre la formacion del sulfuro. (author) [Russian] Mnogie issledovateli izuchali protsessy samookisleniya slozhnykh veshchestv, soderzhashchikh merkaptonovuyu gruppu, s pomoshch'yu molekulyarnogo kisloroda v zhidkoj faze. Ukazyvalos', chto vo vremya reaktsii obrazuetsya sul'fid, no do sikh por ne udavalos' opredelit' tochnogo mekhanizma ehtogo protsessa. Bylo provedeno issledovanie okisleniya merkaptouksusnoj kisloty pri 50{sup o} i pri pH = 8 kak v prisutstvii kompleksona IV, tak i v prisutstvii zheleza. V sistemu byl vveden Na{sub 2}S, mechennyj S{sup 35}, i bylo ustanovleno, chto Na{sub 2}S znachitel'no uvelichivaet skorost' zakhvata kisloroda kak pri protsesse katalizirovannym zhelezom, tak i v protsesse, svobodnom ot ionov zheleza. Vo vremya reaktsii byli izmereny kontsentratsiya sul'fida, ego udel'naya aktivnost' i obshchaya aktivnost'. Na osnovanii ehtikh dannykh i blagodarya vyrabotannomu Nejmanom i ego sotrudnikami kineticheskomu metodu izotopov, predstavilos' vozmozhnym podschitat' temp obrazovaniya sul'fida i ego dal'nejshego okisleniya. Sopostavlenie ehtikh dannykh s drugimi kineticheskimi dannymi pokazalo, chto okislenie merkaptouksusnoj kisloty v zhidkoj faze yavlyaetsya tsepnoj reaktsiej odna iz glavnykh tsepej v ehtoj reaktsii obrazuetsya posredstvom obrazovaniya Na{sub 2}S i ego dal'nejshego okisleniya. Krome togo, bylo ustanovleno, chto vo vremya reaktsii obrazuetsya sul'fat, no tol'ko cherez posredstvo neorganicheskogo sul'fida. Zhelezo katalizirovalo obrazovanie
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Energy Technology Data Exchange (ETDEWEB)
Grimes, W R; Watson, G M; DeVan, J H; Evans, R B [Oak Ridge National Laboratory, Oak Ridge, TN (United States)
1962-03-15
segundo se utilizo para hacer circular una mezcla fundida quo contenia FeF{sub 2} y medir la eliminacion del cromo de la aleacion. Los resultados obtenidos concuerdan satisfactoriamente con los que se calculan con ayuda de los coeficientes de difusion determinados experimentalmente; esta concordancia indica que el coeficiente de autodifusion del Cr no es afectado por las variaciones de la concentracion de cromo en la aleacion Inor-8. (author) [Russian] Kogda ''inkonel'' ili ''inor-8'' podvergayutsya dejstviyu rasplavlennykh ftoristykh smesej, soderzhashchikh vosstanavlivayushchie veshchestva, khrom izbiratel'no okislyaetsya i udalyaetsya iz splava. S pomoshch'yu radioaktivnogo indikatora Cr{sup 51} byli ustanovleny koehffitsienty samodiffuzii khroma v ''inkonsle'' i ''inore-8'', a takzhe byla izuchena primenimost' znachenij ehtikh koehffitsientov k splavam v korrozijnykh usloviyakh. Summarnye koehffitsienty byli polucheny putem sleduyushchikh zamerov: 1) obedneniya v Cr{sup 51} (zagruzhennogo v vide CrF{sub 2}) nekorrozijnykh ftoristykh rasplavov v legirovannykh kapsulakh i 2) sootnosheniya mezhdu izmerimoj obshchej radioaktivnost'yu obrabotannykh sol'yu obraztsov splava i radioaktivnost'yu soli, dejstviyu kotoroj obraztsy byli podvergnuty. Pomimo ehtogo, koehffitsienty byli polucheny putem zamera grafika kontsentratsii indikatora pri posledovatel'noj ehlektropolirovke obraztsov. Summarnye koehffitsienty, a takzhe koehffitsienty, poluchennye opytami ehlektropolirovki, ochen' blizko sovpadayut dlya ''inkonelya'' pri vysokikh temperaturakh i dlya ''inora-8'' pri vsekh temperaturakh. Dlya temperatur nizhe 750{sup o} C koehffitsienty, poluchetshe pri pomoshchi ehlektropolirovki obraztsov ''sinkonelya'' prevyshayut znacheniya summarnykh koehffitsientov; v ehtom sluchae protsess diffuzii v masse ne odnoobrazen. Vo vsekh sluchayakh nablyudalos' khoroshee sovladenie mezhdu summarnymi koehffitsientami diffuzii i koehffitsientami, poluchennymi putem ehkstrapolyatsii dannykh
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Energy Technology Data Exchange (ETDEWEB)
Zimakov, P. V.; Kulichenko, V. V.; Duhovich, F. S.; Salamatmn, B. A.
1963-02-15
steklovidnyh blokov, kak pravilo, vozrastaet posle ih progreva svyshe 400 Degree-Sign C. Otsjuda nezhelatel'no dopuskat' obrazovanija slishkom vysokih temperatur v mogil'nikah. Vysokaja plotnost' radiacii vysokoradioaktivnyh blokov takzhe-sil'no vlijaet na izmenenie struktury blokov, a sledovatel'no i prochnosti lokalizacii v nih oskolochnyh izotopov. Izmenenija takzhe idut v pervuju ochered' s poverhnosti pri kontakte s vneshnej sredoj (vozduh, voda). Vyshela- chivaemost' izotopov iz obluchaemyh blokov, kak pravilo, uvelichivaetsja. Jeksperimental'no ustanovlen povyshennyj vyhod radioaktivnyh izotopov s poverhnosti v gazovuju fazu dlja radioaktivnyh blokov. - Uchityvaja sovokupnost faktorov, dejstvujushhih na steklovidnye bloki v techenie dlitel'nogo vremeni, nuzhno putem special'nogo podbora ih himicheskogo sostava (fljusa) i''uslovij prigotovlenija,' obespechit' nadezhnuju lokalizaciju radioaktivnyh izotopov v zahoronennyh blokah; Osobyj interes v jetom otnoshenii predstavljaet primenenie dlja fljusovanija soedinenij titana. (author)
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Energy Technology Data Exchange (ETDEWEB)
Albert, Ph.; Deyris, M.; Deschamps, N.; Fournet, L. [Centre d' Etudes de Chimie Metallurgique, Vitry (France)
1963-03-15
sechenie zahvata i tol'ko {beta}-ijeluchenie). Odnako znanie koncentracii jetih jelementov v nashih metallah neobhodimo, tak kak v opredelennyh sluchajah oni predstavljajut soboj osnovnye primesi v metalle promyshlennogo naznachenija, kotoryj napravlen dlja ochishhenija. V inyh sluchajah mozhno stolknut'sja s bolee vysokim soderzhaniem primesej otdel'nyh iz jetih jelementov v ochishhennom metalle, nezheli v ishodnom. My otmetim, naprimer, znachenie dozirovki vanadija v aljuminii. Soderzhanie metalla v oblasti 'rasplavlennoj zony' byvaet poroj bolee vysokim, chem v metalle promyshlennogo naznachenija, i mozhet dostigat' do 30% obshej koncentracii dozirovannyh primesej. My opishem metody, issledovannye dlja provedenija kolichestvennyh analizov v razlichnyh sluchajah, s kotorymi my stolknulis'. Nashe izlozhenie kosnetsja v osnovnom opisanija analiza kremnija, hlora, broma i joda, provedennogo po obychnomu metodu radiohimicheskogo vydelenija posle obluchenija nejtronami. Kremnij byl podvergnut distilljacii v Si F{sub e}H{sub 2}. Hlor, brom i jod byli dozirovany na odnu probu dlja analiza. Pri obrabotke smesi galoidnyh solej azotnoj kislotoj jod i brom zameshhajutsja, i oba jelementa propuskajutsja s pomoshh'ju sil'noj vozdushnoj strui cherez neskol'ko poglotitelej: brom fiksiruetsja v rastvore sul'fita natrija, a jod poglashhaetsja v rastvore natrija. Hlor, kotoryj ne vytesnjaetsja iz azotnokislogo rastvora, vypadaet v sostave hloristogo serebra. Takim putem nami byla provedena dozimetrija hlora v jelektrolitnom zheleze i joda - v cirkonii 'Van Arkel'. S drugoj storony, my opishem takzhe metody, kotorye my izuchili dlja provedenija kolichestvennyh analizov na prisutstvie aljuminija, vanadija, magnija i titana v aljuminii, zheleze i cirkonii. jetih analizah sledy izyskivaemogo jelementa vydelilis' do obluchenija 'na neizotopnom nositele'; v nekotoryh sluchajah bystroe radiohimicheskoe ochishhenie proizvodilos' posle obluchenija. Predstavljaetsja vozmozhnym dozirovat' vanadij