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Sample records for bionakoplenie tyazhelykh metallov

  1. Preparative Radiation Chemistry of Transition Metal Complexes; Radiosynthese de complexes de metaux de transition; Radiatsionno-khimicheskij sintez kompleksnykh soedinenij perekhodnykh metallov; Radiosintesis de complejos de los metales de transicion

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    Gustorf, E. Koerner Von; Jun, M. -J.; Koller, H.; Schenck, G. O. [Max-Planck-Institut fuer Kohlenforschung, Abteilung Strahlenchemie, Muelheim-Ruhr, Federal Republic of Germany (Germany)

    1963-11-15

    halogenes et de methacrylate de methyie-fer tetracarbonyle, d'acetate de vinyle-fer tetracarbonyle, etc. 3. Radiosynthese de complexes {pi} et de composes carbonyles de metaux de transition. Exemple: exposition aux rayons gamma du cobalt-60 de [(C{sub 5}H{sub 5}){sub 2}Fe], [(C{sub 5}H{sub 5})2Ni], CH{sub 3}C{sub 5}H{sub 4}Mn(CO){sub 3}, (C{sub 5}H{sub 5}){sub 2}TiCl{sub 2}, Fe(CO){sub 5} et Ni(CO){sub 4} dans des hydrocarbures halogenes. (author) [Spanish] Los complejos {pi} y los compuestos carbonilo de los metales de transicion han adquirido cierta importancia tecnica en virtud de su reactividad especial y de su actividad catalitica. El autor ha llevado a cabo las siguientes investigaciones: 1. Radiointesis de complejos {pi} de metales de transicion. Como ejemplos, puede citarse la preparacion de los complejos anhidrido maleico-hierro tetracarbonilo; fumarato de dimetilo-hierro tetracarbonilo; metacrilato de metilo-hierro tetracarbonilo; acetato de vinilo-hierro tetracarbonilo, etc., por exposicion del Fe(CO){sub 5} y de los compuestos no saturados correspondientes a los rayos gamma del {sup 60}Co. 2. Reacciones quimicas con complejos {pi} formados por via radioquimica. Ejemplos: la polimerizacion de compuestos vinilicos a temperatura ambiente por accion de los compuestos organicos halogenados sobre complejos tales como el metacrilato de metilo-hierro tetracarbonilo, el acetato de vinilo-hierro tetracarbonilo, etc. 3. Radiosintesis de complejos {pi} y compuestos carbonilo de los metales de transicion. Como ejemplos, puede mencionarse la exposicion [(C{sub 5}H{sub 5}){sub 2}Fe], [(C{sub 5}H{sub 5}){sub 2}Ni], CH{sub 3}C{sub 5}H{sub 4}Mn(CO){sub 3}, (C{sub 5}H{sub 5}){sub 2}TiCl{sub 2}, Fe(CO){sub 5}, Ni(CO){sub 4} disueltos en hidrocarburos halogenados, a los rayos gamma del {sup 60}Co. (author) [Russian] {pi}-kompleksy i karbonil'nye' soedineniya perekhodnykh metallov imeyut bol'shoe znachenie v tekhnike iz-za ikh vysokoj reaktsionnoj sposobnosti i kataliticheskoj

  2. Structure of deformed metals. Struktura deformirovannykh metallov

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    Bernshtein, M L

    1977-01-01

    A teaching aid for students at metallurgical and machine-building institutions of higher learning. It can also be used by engineering-technical personnel and scientists. A presentation is made of physical concepts on the mechanism of plastic deformation and its effect on fine structure, structure and properties of metals and alloys. An examination is made of the processes of recovery, polygonization and recrystallization during the heating of cold-deformed metals. The influence of thermal deformation is described to account for the interaction between admixture atoms and dislocations, phase and structural transformations. An examination is made of the phenomenon of superplasticity. Special attention is given to the process of hot deformation. An analysis is made of phenomena at the basis of hardening steel as a result of thermo-mechanical processing, including controlled rolling.

  3. Theoretical Aspects of Phonon Dispersion Curves for Metals; Aspects Theoriques des Courbes de Dispersion des Phonons pour les Metaux; Teoreticheskie aspekty fononnykh dispersionnykh krivykh dlya metallov; Aspectos Teoricos de las Curvas de Dispersion Fononica en Metales

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    Cochran, W. [Department of Natural Philosophy, University of Edinburgh, Scotland (United Kingdom)

    1965-04-15

    predstavljajut rezul'taty po svincu: okazalos' nevozmozhnym podognat' ih na osnove modeli konstanty sily, odnako dispersionnye krivye dlja volnovyh vektorov v simmetrichnyh napravlenijah, esli analizirovat' ih s tochki zrenija konstant sily mezhdu ploskostjami atomov, pokazyvajut nalichie kolebatel'nogo mezhatomnogo potenciala, prostirajushhegosja na rasstojanija, prevyshavshie 20A. Nastojashhij obzor posvjashhen poslednim teoreticheskim rabotam, imejushhim otnoshenie k raschetu fononnyh dispersionnyh krivyh dlja metallov i ob'jasneniju dal'nego dejstvija mezhatomnogo potenciala. V nastojashhee vremja naibolee obnadezhivajushhim metodom obshhej traktovki vzaimodejstvija atomov v metallah predstavljaetsja ''metod nejtral'nyh psevdoatomov'', kotoryj byl nedavno opisan Zimanom. Kratko izlozhena jeta priblizhennaja teorija i rassmotren vopros o ee spravedlivosti dlja anomalij Kona v fononnyh dispersionnyh krivyh. Jeksperimental'nye dannye po natriju soglasujutsja s teoriej, i mezhatomnyj potencial v natrii periodicheski menjaetsja na rasstojanii {pi}/k{sub F}(gde hk{sub F} - moment Fermi), kak bylo uzhe dokazano inym putem Kenigom. Bolee tochnye raschety po natriju proizveli Tojja i Sham. Rassmatrivaetsja svjaz' mezhdu razlichnymi metodami i drugimi rabotami bolee obshhego haraktera, naprimer, rabotoj Harrisona. (author)

  4. The use of radioactive inserts in the study of metal deformation during tube-making processes; Emploi de fils metalliques radioactifs pour l'etude des deformations des metaux pendant la fabrication de tubes; Ispol'zovanie radioaktivnykh vtulok dlya izucheniya deformatsii metallov pri protsesse izgotovleniya trub; Empleo de insertos radiactivos en el estudio de la deformacion de los metales durante la fabricacion de tubos

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    Davison, W H.T. [Tube Investments Research Laboratories, Cambridge (United Kingdom)

    1962-01-15

    experimental, que es aplicable a los estudios sobre deformacion de los metales en general. En este metodo es preciso localizar el inserto radiactivo con un error no mayor de un milimetro, lo que exige un poder de resolucion superior al que requieren normalmente las tecnicas de exploracion medica. Se examinan los problemas correspondientes en terminos de energia gamma, diseno del colimador y discriminacion de energias. (author) [Russian] V nastoyashchej rabote rassmatrivaetsya vopros ob ispol'zovanii radio- aktivnykh vtulok pri izuchenii deformatsii stali v pirsing-protsesse s pomoshch'yu goryachego rotatsionnogo metoda. ZHeleznaya ili stal'naya provoloka aktiviruetsya v reaktore, pomeshchaetsya v truby, pro- sverlennye v zheleznykh ili stal'nykh zagotovkakh, kotorye zatem podvergayutsya obrabotke v normal'nykh proizvodstvennykh usloviyakh. Tshchatel'noe nablyudenie pokazyvaet, chto radiatsionnoe obluchenie i zagryazneniya ustanovki sovershenno neznachitel'ny. Posle okhlazhdeniya zagotovki podvergayutsya analizu v laboratorii putem primeneniya kollimirovannogo stsintillyatsionnogo schetchika, raspolozhennogo perpendikulyarno k poverkhnosti prosverlennoj zagotovki; krivye izodoz pokazyvayut formu deformiro- vannoj radioaktivnoj vtulki, raspolozhennoj pod pryamym uglom k poverkhnosti truby. Drugoj grafik poluchaetsya ot podobnogo roda razvertki uchastka, nakhodyashchegosya pod pryamym uglom k osi truby; pri pomoshchi dvukh poluchennykh grafikov poluchaetsya kartina v trekh izmereniyakh. V dokumente privodyatsya nekotorye rezul'taty, no osnovnoe vnimanie v nem udelyaetsya metodam provedeniya ehksperimentov, kotorye shiroko ispol'zuyutsya pri izuchenii defor- matsii metallov. Vtulki dolzhny byt' raspolozheny na rasstoyanii millimetra ili okolo ehtogo, dlya chego trebuetsya bolee vysokaya razreshayushchaya sposobnost' po sravneniyu s normal'nymi metodami issledovaniya, primenyaemymi v meditsine. Problemy dostizheniya ehtogo ras- smatrivayutsya v nastoyashchem doklade v zavisimosti

  5. Metals distribution in Kumkol deposit petroleum; Raspredelenie metallov v nefti Kumkol`skogo mestorozhdeniya

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    Musaeva, Z G; Nadirov, A N; Ajdarbaev, A S

    1997-11-04

    Metals content in samples of Kumkol deposit petroleum is determined by the method of X-ray diffraction and neutron activation analysis. Specific consideration was devoted to nickel and vanadium. It is possible, that sources of these metals are various petroleum formation as well as both the absorbed or the got in stratum microelements. (author) 10 refs., 1 tab. Suppl. Neft` i gaz Kazakhstana

  6. Physical nature of the fracture of metals. Fizicheskaia priroda razrusheniia metallov

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    Vladimirov, V I

    1984-01-01

    The physical concepts of fracture, which is treated as a kinetic, statistical, multistage, and multiscale process, are presented. Microscopic models for crack nucleation and growth based on the physics of defects (dislocations, disclinations, and vacancies) are examined, and the principal stages of the fracture process are discussed. In particular, attention is given to the generation of local superstresses, nucleation and growth of microcracks, nucleation of macrocracks, the structure of the plastic zone at the tip of a macrocrack, and unstable crack growth. Particular cases involving changes in loading conditions, lattice type, or dislocation structure are examined. 177 references.

  7. Redox reactions in rare earth chloride molten electrolytes; Okislitel'no-vosstanovitel'nye reaktsii v rasplavlennykh ehlektrolitakh, soderzhashchikh khloridy redkozemel'nykh metallov

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    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.

  8. On an aspect of kinetics both defects accumulation and gas absorption in an irradiated metals oxides; K voprosu o kinetike nakopleniya defektov i adsorbtsii gazov v obluchennykh oksidakh metallov

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    Tuseev, T [Mekhdunarodnyj Kazakhsko-Turetskij Univ. im. Kh.A. Yasavi, Turkestan (Kazakhstan); Polyakov, A I; Bitenbaev, M I [Fiziko-Tekhnicheskij Inst., Almaty (Kazakhstan)

    2001-07-01

    In the work an analysis of experimental data during study both gases adsorption processes and radiation defects accumulation in irradiated (ultraviolet, gamma-, neutron-, alpha-particle- and proton radiation) in the oxides (SiO{sub 2}, Al{sub 2}O{sub 3}, BeO, Se{sub 2}O{sub 3}, Dy{sub 2}O{sub 3}, La{sub 2}O{sub 3}, Er{sub 2}O{sub 3}) is carried out. It is determined, that these processes are correlating with each other and equivalent kinetic equations for its description are proposed.

  9. Saturated vapor pressure over molten mixtures of GaCl{sub 3} and alkali metal chlorides; Davlenie nasyshchennykh parov rasplavlennykh smesej CaCl{sub 3} s khloridami shchelochnykh metallov

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    Salyulev, A B; Smolenskij, V V; Moskalenko, N I [UrO RAN, Inst. Vysokotemperaturnoj Ehlektrokhimii, Elaterinburg (Russian Federation)

    2004-07-01

    Volatilities of GaCl{sub 3} and alkali metal chlorides over diluted (up to 3 mol %) solutions of GaCl{sub 3} in LiCl, NaCl, KCl, RbCl, and CsCl were measured at 1100 K by dynamic and indirect static methods. Chemical composition of saturated vapor over the mixed melts was determined. Partial pressures of the components were calculated. Their values depend essentially on specific alkali metal cation and on concentration of GaCl{sub 3}; their variation permits altering parameters of GaCl{sub 3} distillation from the salt melt in a wide range.

  10. Interaction of phosphorus pentachloride with trichlorides of metals of the second half of lanthanide series and scandium subgroup; Vzaimodejstvie pentakhlorida fosfora s trikhloridami metallov vtoroj poloviny semejstva lantanidov i podgruppy skandiya

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    Salyulev, A B; Vovkotrub, Eh G; Strekalovskij, V N [Inst. Vysokotemperaturnoj Ehlektrokhimii UrO RAN, Ekaterinburg (Russian Federation)

    1999-02-01

    With the use of Raman laser spectroscopy a study is made into interactions of molten TbCl{sub 3}, ErCl{sub 3}, YbCl{sub 3}, YCl{sub 3} and ScCl{sub 3} with phosphorus pentachloride vapors at elevated pressure (up to 30-35 atm) as well as solid REM trichlorides with molten PCl{sub 5}. It is revealed for first time that the interaction can be accompanied by reactions resulting in formation of complex chloride cations [PCl{sub 4}]{sup +} and anions [MCl{sub 6}]{sup 3-} of trivalent metals. The prediction is made about the possibility of chemical interaction of phosphorus pentachloride with trichlorides of all yttrium subgroup lanthanides under similar conditions.

  11. Study of reactions of metals with sulphur and phosphorus compounds by pulsed temperatures; Etude des reactions entre metaux et composes du soufre et du phosphore au moyen de brusques hausses de temperature; Issledovanie reaktsii metallov s soedineniyami sery i fosfora pri regulyarnykh izmeneniyakh temperatury; Estudio de reacciones entre metales y compuestos de azufre y de fosforo empleando impulsos de temperatura

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    Campbell, R B; Grunberg, L [National Engineering Laboratory, East Kilbride, Glasgow (United Kingdom)

    1962-01-15

    The anti-wear action of sulphur and phosphorus compounds which are usually added to gear-oils depends on chemical reactions with the metallic surfaces of the gears. These reactions occur both at the bulk oil temperature (approx. 100 Degree-Sign C) and during high temperatures (approx. 600 Degree-Sign C) of short duration when the gearteeth come into contact under lead. The temperature flashes were simulated in an apparatus in which short pulses of electric current were used to heat metal wires immersed in mineral oil containing S{sup 35} and P{sup 32} labelled compounds in solution. The radioactivity acquired by the wires was measured. The extent of the reactions was determined as a function of temperature and time and the results were interpreted in terms of conventional kinetic laws. The modification of the reaction rates by the presence of other compounds in the solution was studied. The effect of pre-formed surface films containing sulphur phosphorus, chlorine and/or oxygen was also determined. In explaining the results, the structure of the materials used and the diffusion processes whereby the reactions occur beyond the initial stages were considered. (author) [French] Les composes du soufre et du phosphore que l'on ajoute souvent aux huiles de graissage offrent une protection contre l'usure, mais cette protection depend des reactions chimiques avec les surfaces metalliques des engrenages. Ces reactions ont lieu aussi bien a la temperature de la masse de l'huile (environ 100 Degree-Sign C) qu'au moment des brusques hausses de temperature (environ 600 Degree-Sign C) qui se produisent lorsque les dents d'engrenage viennent en contact avec pression. Les chocs thermiques ont ete simules dans un appareil a l'interieur duquel on a produit de breves impulsions de courant electrique pour chauffer des fils metalliques immerges dans une huile minerale contenant des composes marques au soufre-35 et au phosphore-32 en solution. Les auteurs ont mesure la radioactivite acquise par les fils, determine l'ampleur des reactions en fonction de la temperature et du temps, et interprete les resultats d'apres les lois de la cinetique classique. Ils ont etudie comment les vitesses de reaction etaient modifiees par la presence d'autres composes dans la solution. Les auteurs du memoire ont egalement determine l'effet de pellicules superficielles preformees renfermant du soufre, du phosphore, du chlore et/ou de l'oxygene. Pour expliquer les resultats obtenus, ils ont tenu compte de la structure des matieres employees ainsi que des phenomenes de diffusion par suite desquels les reactions se prolongent au-dela des stades initiaux. (author) [Spanish] El efecto de proteccion contra el desgaste ejercido por los compuestos de azufre y de fosforo que generalmente se anaden a los aceites para engranajes se produce en virtud de reacciones quimicas con las superficies metalicas de los engranajes. Estas reacciones tienen lugar tanto a, la temperatura media del aceite (aproximadamente 100 Degree-Sign C) como a las temperaturas elevadas (del orden de 600 Degree-Sign C) que se alcanzan durante periodos cortos cuando los dientes de los engranajes entran en contacto en estado de carga. Los autores han simulado los impulsos de temperatura en un aparato en el que se calientan, mediant o breves impulsos electricos, unos alambres metalicos sumergidos en un aceite mineral en el que se han disuelto compuestos marcados con azufre-35 y con fosforo-32. A continuacion midieron la radiactividad adquirida por los alambres. Determinaron el grado de la reaccion en funcion de la temperatura y del tiempo e interpretaron los resultados desde el punto de vista de las leyes de la cinetica clasica. Los autores estudiaron las modificaciones de la velocidad de reaccion debidas a la presencia de otros compuestos en la solucion. Tambien determinaron el efecto que ejercen peliculas superficiales preformadas que contienen azufre, fosforo, cloro y/u oxigeno. Para explicar los resultados, 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)

  12. Effect of electrolyte sorbed by nonion-exchange mechanism on the state and diffusive mobility of water and alkali metal ions in perfluorinated sulfocationic membranes from NMR data. Vliyanie neionoobmenno sorbirovannogo ehlektrorlita na sostoyanie i diffuzionnuyu podvizhnost' vody i ionov shchelochnykh metallov v perftorirovannykh sul'fokationitovykh membranakh po dannym YaMR

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    Volkov, V I; Sidorenkova, E A; Korochkova, S A; Novikov, N A; Sokol' skaya, I B; Timashev, S F [Nauchno-Issledovatel' skij Fiziko-Khimicheskij Inst., Moscow (Russian Federation)

    1994-03-01

    On the basis of data of high-resolution NMR on [sup 1]H nuclei of water, [sup 23]Na and [sup 133]Cs, of counterions Na[sup +] and Ca[sup +] the influence of nonionexchange sorved alkalis and metal chlorides on the state and diffusive mobility of the counterions was studied. It is shown that the type of co-ion can affect considerably the translational diffusion of metal ions.

  13. Glucocorticosteroid-induced osteoporosis: pathogenesis, prevention, treatment

    Directory of Open Access Journals (Sweden)

    I A Baranova

    2008-01-01

    Full Text Available Glyukokortikoidindutsirovannyy osteoporoz (GIO - odno iz naibolee tyazhelykh oslozhneniy dlitel'noy (bolee 3 mes sistemnoy terapii glyukokortikoidami (SGK. On razvivaetsya u bol'nykh lyubogo vozrasta i pola i yavlyaetsya naibolee chastoy sistemnoy formoy vtorichnogo osteoporoza (OP. Bystraya poterya kostnoy massy proiskhodit uzhe v pervye mesyatsy lecheniya SGK. Perelomy ot minimal'noy travmy voznikayut pri bolee vysokikh pokazatelyakh mineral'noy plotnosti kosti, chem u bol'nykh pervichnym OP. Dazhe ispol'zovanie malykh doz SGK privodit k povysheniyu riska perelomov, s uvelicheniem sutochnoy dozy risk perelomov vozrastaet. U patsientov, primenyayushchikh vysokie dozy ingalyatsionnykh GK (IGK, uvelichenie riska OP i perelomov v bol'shey stepeni obuslovleno tyazhest'yu respiratornogo zabolevaniya, chem terapiey IGK. Predstavleny sovremennye printsipy profilaktiki i lecheniya GIO.

  14. Sulfur in Earth's Mantle and Its Behavior During Core Formation

    Science.gov (United States)

    Chabot, Nancy L.; Righter,Kevin

    2006-01-01

    The density of Earth's outer core requires that about 5-10% of the outer core be composed of elements lighter than Fe-Ni; proposed choices for the "light element" component of Earth's core include H, C, O, Si, S, and combinations of these elements [e.g. 1]. Though samples of Earth's core are not available, mantle samples contain elemental signatures left behind from the formation of Earth's core. The abundances of siderophile (metal-loving) elements in Earth's mantle have been used to gain insight into the early accretion and differentiation history of Earth, the process by which the core and mantle formed, and the composition of the core [e.g. 2-4]. Similarly, the abundance of potential light elements in Earth's mantle could also provide constraints on Earth's evolution and core composition. The S abundance in Earth's mantle is 250 ( 50) ppm [5]. It has been suggested that 250 ppm S is too high to be due to equilibrium core formation in a high pressure, high temperature magma ocean on early Earth and that the addition of S to the mantle from the subsequent accretion of a late veneer is consequently required [6]. However, this earlier work of Li and Agee [6] did not parameterize the metalsilicate partitioning behavior of S as a function of thermodynamic variables, limiting the different pressure and temperature conditions during core formation that could be explored. Here, the question of explaining the mantle abundance of S is revisited, through parameterizing existing metal-silicate partitioning data for S and applying the parameterization to core formation in Earth.

  15. Rare-Earth-Rich Alloys; Alliages a Teneur Elevee en Terres Rares; Splavy, obogashchennye redkozemel'nymi ehlementami; Aleaciones Ricas en Tierras Raras

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    Copeland, M.; Kato, H. [Albany Metallurgy Research Center, Bureau of Mines, United States Department of the Interior, Albany, OR (United States)

    1964-06-15

    solubilidad solida del metal aleado con la tierra rara y estudiaron la oxidacion y la corrosion. Los autores no observaron ningun aumento de la resistencia a la oxidacion en la atmosfera que pudiera atribuirse a la aleacion; es mas, la mayor parte de las adiciones ejercieron efectos nocivos. El aluminio mejoro notablemente la resistencia a la corrosion en agua caliente de las tierras raras sometidas a ensayo; la adicion de otros metales no pertenecientes al grupo de las tierras raras tambien aumento esa resistencia, pero en menor grado. (author) [Russian] Redkozemel'nye metally s vysokim secheniem zahvata teplovyh nejtronov predstavljajut interes dlja upravlenija reaktorami, proizvodjashhimi jelektrojenergiju; odnako oni podverzheny korrozii. I s hodja iz toj predposylki, chto neredkozemel'nye metally mogut byt' splavleny s disproziem, orbiem, gadoliniem i samariem i mogut uluchshit' ih svojstva, izucheny vlijanija redkozemel'nyh metallov opredelennyh dobavok ih na splavy. Izuchena rastvorimost' n e redkozemel'nyh metallov cirkonija, vanadija, hroma, zheleza, nikelja, medi, aljuminija i kremnija v disprozii, jerbii, gadolinii i samarii, a takzhe ih vlijanie na tochki plavlenija, preobrazovanie v tverdoe telo i korrozijnye svojstva. Podgotovleny diagrammy faz vplot' do pervyh soedinenij, obogashhennyh redkozemel'nymi jelementami ili jevtetik, kotorye voznikli vpervye. Po zavershenii jetoj chasti raboty byli sozdany splavy, obrabotany pri vysokoj temperature s cel'ju poluchenija maksimal'noj rastvorimosti tverdyh neredkozemel'nyh jelementov, dobavljaemyh dlja splava, i byli provedeny ispytanija na okislenie i korroziju. Pri splavlenii ne nabljudalos' uluchshenija redkozemel'nyh metallov v otnoshenii stojkosti k okisleniju na vozduhe, i fakticheski v bol'shinstve dobavki okazalis' vrednymi. Aljuminij v znachitel'noj stepeni uluchshil soprotivljaemost' k korrozii ot gorjachej vody v aprobirovannyh redkozemel'nyh jelementah; drugie neredkozemel'nye metally pri dobavkah uluchshili

  16. New Instruments and Principles for the Dimensional Measurement and Measurement of Spacing of Reactor Components; Nouveaux Instruments et Procedes de Mesure des Dimensions et de l'Espacement des Elements d'un Reacteur; Novye pribory i printsipy izmereniya razmerov i raspolozheniya komponentov reaktora; Nuevos Instrumentos y Principios para Medir las Dimensiones y la Separacion Entre Componentes de Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Mueller, P. [Institut Dr. Foerster, Reutlingen, Federal Republic of Germany (Germany)

    1965-09-15

    la practica. Se examina la medicion de recubrimientos no magneticos aplicados sobre materiales magneticos, se explican los principios de la medicion (metodos de campo magnetico con corriente continua y alterna) y se describen instrumentos para medir recubrimientos no magneticos de espesor comprendido entre 3 {mu}m y 20 mm. Se analiza el problema especial de medir depositos de estelita sobre paredes ferrnicas de recipientes de reactor. Se estudia la medicion de recubrimientos no conductores, aplicados sobre metales no ferrosos. Se explica el principio de medicion (corrientes de Foucault), se describe un instrumento destinado a este fin y se dan ejemplos tfpicos de. mediciones. El autor examina tambien la medicion de dimensiones ffsicas de los componentes metalicos de reactores, sin elementos en contacto con los mismos y describe diversos metodos aplicables a metales ferrosos y no ferrosos (metodo del campo magnetico con corriente continua y alterna, metodo de corrientes de Foucault), Se describen instrumentos y se dan ejemplos de mediciones a distancia del diametro, ovalidad, distorsion, etc., de componentes de reactor. Se exponen metodos para medir la separacion entre tales componentes, en la zona radiactiva del reactor. Se describe un instrumento para registrar perfiles de superficies y para indicacion directa de valores de aspereza ('Rauhtiefe', 'Glaettungstiefe', valor promedio y valor cuadratico medio). Se analizan ejemplos tfpicos del empleo de este instrumento para componentes de reactor. Se presta especial atencion a la posibilidad de usar un captador pequeno y de aplicaciones multiples mediante manipuladores en zonas y en materiales radiactivos. Se analiza el aumento de la aspereza superficial en funcion de la dosis de irradiacion. (author) [Russian] Full text: Rassmatrivaetsja izmerenie tolshhiny listov i tolshhiny stenok trub i kontejnerov iz austenitnyh i cvetnyh metallov. Obsuzhdajutsja dva metoda beskontaktnogo izmerenija tolshhiny stenok: a) metod

  17. Chondritic Mn/Na ratio and limited post-nebular volatile loss of the Earth

    Science.gov (United States)

    Siebert, Julien; Sossi, Paolo A.; Blanchard, Ingrid; Mahan, Brandon; Badro, James; Moynier, Frédéric

    2018-03-01

    The depletion pattern of volatile elements on Earth and other differentiated terrestrial bodies provides a unique insight as to the nature and origin of planetary building blocks. The processes responsible for the depletion of volatile elements range from the early incomplete condensation in the solar nebula to the late de-volatilization induced by heating and impacting during planetary accretion after the dispersion of the H2-rich nebular gas. Furthermore, as many volatile elements are also siderophile (metal-loving), it is often difficult to deconvolve the effect of volatility from core formation. With the notable exception of the Earth, all the differentiated terrestrial bodies for which we have samples have non-chondritic Mn/Na ratios, taken as a signature of post-nebular volatilization. The bulk silicate Earth (BSE) is unique in that its Mn/Na ratio is chondritic, which points to a nebular origin for the depletion; unless the Mn/Na in the BSE is not that of the bulk Earth (BE), and has been affected by core formation through the partitioning of Mn in Earth's core. Here we quantify the metal-silicate partitioning behavior of Mn at deep magma ocean pressure and temperature conditions directly applicable to core formation. The experiments show that Mn becomes more siderophile with increasing pressure and temperature. Modeling the partitioning of Mn during core formation by combining our results with previous data at lower P-T conditions, we show that the core likely contains a significant fraction (20 to 35%) of Earth's Mn budget. However, we show that the derived Mn/Na value of the bulk Earth still lies on the volatile-depleted end of a trend defined by chondritic meteorites in a Mn/Na vs Mn/Mg plot, which tend to higher Mn/Na with increasing volatile depletion. This suggests that the material that formed the Earth recorded similar chemical fractionation processes for moderately volatile elements as chondrites in the solar nebula, and experienced limited post

  18. Lattice Dynamics of Transition Metals; Dynamique de Reseau des Metaux de Transition

    Energy Technology Data Exchange (ETDEWEB)

    Woods, A. D.B. [Chalk River Nuclear Laboratories, Chalk River, ON (Canada)

    1965-04-15

    {sup 12} c/s para {zeta} = 1.0. Si estas y otras particularidades observadas son anomalias de Kohn, sus posiciones son compatibles con las dimensiones de la superficie de Fermi propuesta por Lomer para los metales de la columna V. Se formula la hipotesis de que las sorprendentes diferencias existentes entre la relacion de dispersion del niobio y la del molibdeno (metales que, segun se cree, poseen estructuras de banda muy semejantes) reflejan diferencias en las energias de Fermi y, por tanto, en las superficies de Fermi de estos materiales. (author) [Russian] Dispersionnoe sootnoshenie chastota/volnovoj vektor v(q) dlja obychnyh vidov kolebanij nekotoryh ob{sup e}mno-centrirovannyh kubicheskih kristallov perehodnyh metallov bylo nedavno izmereno pri komnatnoj temperature. Krivye dispersii dlja niobija, izmerennye Nakagovoj i Vudsom, projavili nekotorye ochen' neobychnye cherty, i rezul'taty mozhno bylo privesti v sootvetstvie tol'ko s pomoshh'ju modeli Born fon Karmana, esli vkljuchit' vzaimodejstvija s ochen' otdalennymi chlenami rjada dal'she vos'mogo. Posledujushhie izmerenija Vudsom tantala dali ochen' pohozhie rezul'taty. Jeto ne udivitel'no, poskol'ku niobij i tantal nahodjatsja v V gruppe periodicheskoj tablicy i mnogie iz ih jelektronnyh svojstv odinakovy. Izmerenija krivyh dispersij molibdena Vudsom i Chenom i vol'frama Chenom i Brok- hauzom pokazali, chto, hotja u jetih metallov, kotorye nahodjatsja v gruppe VI periodicheskoj tablicy, dispersionnye sootnoshenija javljajutsja analogichnymi, jeti dispersionnye sootnoshenija sil'no otlichajutsja ot dispersionnyh sootnoshenij dlja niobija i tantala, nahodjashhihsja v gruppe V. Osnovnye cherty u(q) dlja molibdena i vol'frama ochen' blizko opisyvajutsja tret'im chlenom rjada simmetrichnoj po osjam silovoj modeli Born-fon Karmana, hotja nekotorye vazhnye cherty ne vosproizvodjatsja jetoj model'ju. Odnoj iz takih chert javljaetsja razitel'naja anomalija v prodol'noj [{zeta}{zeta}{zeta}] vetvi (L) dlja molibdena, gde

  19. New Methods and Facilities for the Measurement of Physical Properties of Reactor Components and Irradiated Materials; Nouveaux Procedes et Instruments de Mesure des Proprietes Physiques des Elements de Reacteur et des Matieres Irradiees; Novye metody i sredstva izmereniya fizicheskikh s vojstv komponentov reaktora i obluchennykh materialov; Nuevos Metodos y Equipos para Medir Propiedades Fisicas de Componentes de Reactor y de Materiales Irradiados

    Energy Technology Data Exchange (ETDEWEB)

    Foerster, F.; Mueller, P. [Institut Dr. Foerster, Reutlingen, Federal Republic of Germany (Germany)

    1965-09-15

    kolebanija ili putem izmerenija polushiriny rezonansnoj krivoj. Privodjatsja primery izmerenij vosstanovlenija posle radiacionnogo.povrezhdenija i posle plasticheskoj deformacii, a takzhe primery stepeni gra- fitizacii. Opisyvajutsja obnaruzhenie defektov i kolebanija plotnosti grafitovyh blokov. Krome togo ob{sup j}asnjaetsja metod issledovanija zakreplenija tabletok iz UO{sub 2} v tonkostennyh austenitnyh trubkah. Opisyvaetsja special'naja pech' dlja izuchenija uprugogo i neuprugogo povedenija ''gorjachih'' obrazcov pri temperaturah ot 20 do 1000 Degree-Sign C. Obsuzhdaetsja kontrol' kachestva cvetnyh metallov putem izmerenija jelektroprovodnosti s pomoshh'ju vihrevyh tokov. Opisyvaetsja pribor dlja beskontaktnogo izmerenija jelektroprovodnosti cvetnyh metallov. Ob'jasnjaetsja sootnoshenie mezhdu jelektroprovodnost'ju i deformaciej pod naprjazheniem cvetnyh metallov i splavov. Osoboe vnimanie obrashhaetsja na izmerenie nebol'shih po razmeru obrazcov. Opisyvaetsja ustrojstvo dlja distancionnyh prjamyh izmerenij v ''gorjachej'' zone reaktora. Rassmatrivaetsja zavisimost' jelektroprovodnosti ot doz obluchenija. Opisyvaetsja pribor dlja izmerenija pronicaemosti, ostatochnoj magnitnoj indukcii i kojercitivnoj sily kak funkcii mehanicheskogo naprjazhenija, uprugoj i plasticheskoj deformacii i doz obluchenija. Opisyvajutsja izmerenija izmenenij magnitnyh svojstv kak funkcii uprugogo naprjazhenija i plasticheskoj deformacii. Rassmatrivaetsja vlijanie obluchenija na pronicaemost' i kojercitivnuju silu. Opisyvaetsja pribor dlja bystrogo izmerenija i neposredstvennogo opredelenija pronicaemosti komponentov iz nerzhavejushhej stali. Ob'jasnjaetsja sootnoshenie mezhdu pronicaemost'ju i soderzhaniem D ferrita. Rassmatrivajutsja rezul'taty izmerenij procentnogo soderzhanija D ferrita v svarnyh shvah trubok iz nerzhavejushhej stali i izmerenij osazhdenija D ferrita kak funkcii plasticheskoj deformacii (svobodnaja kovka toplivnyh jelementov reaktora). (author)

  20. Measurement of resonance parameters of cross-sections affecting fast-neutron propagation in various media; Mesure des parametres de resonance de sections efficaces lies a la propagation des neutrons dans differents milieux; Izmerenie parametrov rezonansnoj struktury sechenij, vliyayushchikh na rasprostranenie bystrykh nejtronov v sredakh; Medicion de los parametros de resonancia de las secciones eficaces que afectan a la propagacion de los neutrones rapidos en distintos medios

    Energy Technology Data Exchange (ETDEWEB)

    Nikolaev, M N; Filippov, V V; Bondarenko, I I [Academy of Sciences, Moscow, Union of Soviet Socialist Republics (Russian Federation)

    1962-03-15

    , prostiraetsya vplot' do neskol'kikh desyatkov kehv dlya tyazhelykh yader i do neskol'kikh Mehv dlya yader srednego vesa. Dlya ucheta rezonansnykh ehffektov pri vychislenii gruppovykh parametrov neobkhodimo znat' ne tol'ko srednie secheniya vzaimodejstviya nejtronov s veshchestvami, no i takie velichiny, kak (1/{Sigma}{sub t}), (1/{Sigma}{sub t}{sup 2}) i drugie - skobki oznachayut usrednenie po ehnergeticheskoj gruppe. Imeyushchiesya v nastoyashchee vremya svedeniya o rezonansnykh parametrakh v oblasti bystrykh nejtronov nedostatochny dlya togo, chtoby ukazannye velichiny mogli byt' vychisleny s neobkhodimoj tochnost'yu. V svyazi s ehtim predstavlyaet interes neposredstvenno e izmerenie velichin (1/{Sigma}{sub t}), (1/{Sigma}{sub t}{sup 2}) i drugikh analogichnykh kharakteristik. V doklade privodyatsya rezul'taty izmerenij ryada parametrov takikh kak ({Sigma}{sub t}), ({Sigma}{sub t}{sup 2}), (1/{Sigma}{sub t}), (1/{Sigma}{sub t}{sup 2}), (1/{Sigma}{sub t}{sup 3}) i drugie, kharakterizuyushchi kh strukturu sechenij ryada yader srednego vesa v oblasti ot 300 kehv do 3 Mehv. Ukazannye velichiny byli polucheny putem analiza krivykh propuskaniya, snyatykh v khoroshej geometrii vplot' do propuskanij {approx}10{sup -2}. Poluchennye dannye ukazyvayut na sil'noe vliyanie rezonansnykh ehffektov na diffuzionnye kharakteristiki veshchestva. (author)

  1. The Application of Oxygen Concentration Cells with the Solid Electrolyte ZrO{sub 2} * CaO to Thermodynamic Research; Emploi des Cellules a Concentration d'Oxygene avec Electrolyte Soude de ZrO{sub 2} * CaO, Dans les Recherches en Thermodynamique; Primenenie kislorodnykh kontsentratsionnykh kamer s tverdym ehlektrolitom ZrO{sub 2} * CaO dlya issledovanij po termodinamike; Aplicacion de las Celdas de Concentracion de Oxigeno con Electrolito Solido de ZrO{sub 2} * CaO a las Investigaciones Termodinamicas

    Energy Technology Data Exchange (ETDEWEB)

    Matsushita, Y.; Goto, K. [University of Tokyo (Japan)

    1966-01-15

    este metodo podria utilizarse para determinar el contenido de oxigeno en hierro liquido a 1500 Degree-Sign - 1600 Degree-Sign C. Ademas, se sugieren posibilidades de aplicar las celdas de concentracion de oxigeno al estudio basico de procesos metalurgicos, y se analizan diversas aplicaciones industriales. (author) [Russian] Obsuzhdajutsja shest' jeksperimental'nyh issledovatel'skih rabot, svjazannyh s primeneniem kislorodnyh koncent- racionnyh kamer jelektrolita ZrO{sub 2} * CaO (kotoryj obespechivaet chistuju anionnuju provo- dimost' v vide migracii kislorodnyh defektov) dlja provedenija, osnovnyh issledovanij po tehnologii metallov: 1) Standartnye svobodnye jenergii obrazovanija FeO, Fe{sub 3}O{sub 4}, SnO, PbO, Cu{sub 2}O, CuO i Ta{sub 2}O{sub 5} byli izmereny i vyrazheny v vide funkcij temperatury v diapazone 500 - 1300 Degree-Sign C. 2) Davlenie kisloroda v zhidkom rastvore PbO - SiO{sub 2}, nahodjashhemsja v ravnovesii s zhid- kim svincom, izmerjalos' pri temperature 1100 Degree-Sign C. Byli rasschitany himicheskie aktivnosti Pb i SiO{sub 2} i termodinamicheskie svojstva rastvora PbO - SiO{sub 2}. 3) Odin iz avtorov, izmeril himicheskuju aktivnost' olova v zhidkom binarnom rastvo- re Pb - Sn pri temperaturah ot 700 do 900 Degree-Sign C. Byli vychisleny takzhe termodinamicheskie svojstva splavov Pb - Sn. 4) Jetot avtor takzhe razrabotal manometr dlja izmerenija parcial'nogo davlenija kisloro- da v vysokotemperaturnyh gazah v diapazone P(O{sub 2}) = 10{sup -1} - 10{sup -20} atm i pri temperature 500 Degree-Sign - 1300 Degree-Sign C. Byli polucheny samosoglasovannye i vosproizvodimye je.d.s. po razlichnomu sostavu smesej gazov. 5) Skorost' reakcij okislenija ili vosstanovlenija chistogo zheleza i okislov zheleza gazovoj smes'ju CO - CO{sub 2} rasschityvalis' na osnovanii rezul'tatov, poluchennyh s pomoshh'ju manometra pri temperature 900 Degree-Sign - 1000 Degree-Sign C. 6) Davlenie kisloroda v zhidkom zheleze, soderzhashhem razlichnye kolichestva uglero- da vplot

  2. Non-Destructive Examination of the Heat-Affected Zone of Welded Zr-Nb Alloy; Controle Non Destructif de la Zone d'Un Alliage Zr-Nb Affectee par la Chaleur Lors du Soudage; Nedestruktivnoe ispytanie zony svarnogo shva iz tsirkonij-niobij splava, kotoryj podverzhen teplovomu vliyaniyu; Examen No Destructivo de la Zona de Soldadura Afectada por el Calor en las Aleaciones de Circonio y Niobio

    Energy Technology Data Exchange (ETDEWEB)

    Hanstock, R. F.; Walker, D. C.B. [U.K.A.E.A. Reactor Materials Laboratory, Culcheth (United Kingdom)

    1965-10-15

    sencilla modificacion, para examinar las soldaduras en las aleaciones de circonio y niobio. Se da un ejemplo de las variaciones en la respuesta de la sonda en las distintas partes de una soldadura afectadas por el calor, y se las compara con los resultados del estudio de la corrosion efectuado en autoclave. (author) [Russian] Ispol'zovanie splava iz cir- konija i 2,5% niobija dlja obolochki vysokogo davlenija v reaktorah s vodnym zamedlitelem imeet rjad preimushhestv, svjazannyh s prochnost'ju je t ogo splava blagodarja termoobrabotke. Termoobrabotka takzhe chuvstvitel'no vlijaet na korrozionnuju stojkost' splava v uslovijah raboty reaktora, i v zonah svarki plavleniem, kotorye podverzheny teplovomu vlijaniju, mogut pojavit'sja zony nizkoj korrozionnoj stojkosti. Zony, podverzhennye korrozii, mozhno usta- novit' putem obrabotki v avtoklave. Odnako je tot metod javljaetsja neudobnym v teh slucha- jah, kogda putem svarki sobirajutsja krupnogabaritnye kontury vysokogo davlenija. Prishli k vyvodu, chto zony teplovogo vozdejstvija, chuvstvitel'nye k korrozii, mozhno obnaruzhit' putem izmerenija termojelektricheskogo potenciala mezhdu nagretym metallicheskim tochech- nym zondom, kontaktirujushhimsja s opredelennymi oblastjami svarnogo shva, i primykajushhim k nemu metallom. Termojelektricheskij zond izgotavlivaetsja tak zhe, kak zond, kotoryj soz - dan Britanskoj associaciej po issledovanijam cvetnyh metallov dlja izmerenija tolshhiny pokrytija metallicheskih substratov. Imejushhijsja v prodazhe pribor, kotoryj vkljuchaet takoj zond s neznachitel'nymi vidoizmenenijami, mozhno ispol'zovat' dlja ispytanija svarnyh soedinenij iz cirkonij-niobij splavov. Privoditsja primer izmenenija zondovoj chuvstvitel'- nosti po zonam svarnogo shva, podverzhennym teplovomu vozdejstviju, i jet ot primer srav- nivaetsja s provedennym v avtoklave ispytaniem na korroziju. (author)

  3. Radioisotope Power Sources; Sources d'energie utilisant les radiobotopes; Radioizotopnye istochniki ehnergii; Fuentes radio isotopicas de energia

    Energy Technology Data Exchange (ETDEWEB)

    Culwell, J. P. [USAEC, Washington, D.C (United States)

    1963-11-15

    realizando investigaciones con generadores alimentados por mezclas de productos de fision. Estas seran menos costosas que los radioisotopos puros, pues se suprimen los gastos de separacion y purificacion de isotopos. En la actualidad funcionan o estan a punto de funcionar generadores termoelectricos prototipo, alimentados con estroncio-90 y cesio-137, en estaciones meteorologicas, dispositivos auxiliares de navegacion y aparatos de vigilancia de las profundidades del mar. En el espacio funcionan generadores termoelectricos de plutonio-238 como fuentes de energia electrica del satelite TRANSIT de la Marina de los Estados Unidos. Se estan construyendo asimismo generadores para los proyectos espaciales de la National Aeronautics and Space Administration de dicho pais. La elevada radiactividad inherente a las fuentes radioisotopicas de energia exige que se preste especial atencion a la seguridad de las mismas. Se han establecido rigurosas normas de proteccion y se han ejecutado ensayos muy avanzados para poder emplear estos dispositivos sin originar riesgos inaceptables. (author) [Russian] Programma ispol'zovaniya radioaktivnykh izotopov v kachestve ehnergeticheskogo syr'ya, razrabotannaya Komissiej po atomnoj ehnergii SSHA, privela k sozdaniyu sovershenno novoj tekhnologii primeneniya radioizotopov v kachestve istochnikov ehnergii v generatorakh ehlektroehnergii. Sistema radioizotopnykh ehnergeticheskikh stantsij osobenno nuzhna tam, gde vvidu krajnej otdalennosti trebuyutsya dolgovechnye, nadezhnye i malogabaritnye silovye ustanovki. Sposobnye udovletvoritel'no funktsionirovat' v tyazhelykh usloviyakh, naprimer pri dejstvii temperatur, solnechnogo sveta i ehlektromagnitnogo izlucheniya, takie ''atomnye batarei'' yavlyayutsya zamanchivymi istochnikami ehnergii dlya ustanovok, sobirayushchikh informatsiyu na rasstoyanii, dlya upravlyayushchikh sistem, dlya iskustvennykh sputnikov i drugikh kosmicheskikh ob{sup e}ktov. Radioizotopy, primenyayushchiesya v kachestve goryuchego

  4. Thermodynamic Calculation of the Distribution Coefficient Between the Liquid and Solid Phases of an Element in Dilute Solution in a Metal: Application to the Purification of Beryllium; Calcul Thermodynamique du Coefficient de Distribution Entre Phases Liquide et Solide d'un Element en Presence d'Autres Constituants en Solution Diluee dans un Metal: Application a la Purification du Beryllium

    Energy Technology Data Exchange (ETDEWEB)

    Desre, P. [Ecole Nationale Superieure d' Electrochimie et d' Electrometallurgie (France); Schaub, B. [Centre d' Etudes Nucleaires de Grenoble (France); Bonnier, I. E. [Ecole Nationale Superieure d' Electrochimie et d' Electrometallurgie, Grenoble (France)

    1966-01-15

    }{sup {infinity}}{sub ij} siendo {gamma}{sup {infinity}}{sub i(M)}, {gamma}{sup {infinity}}{sub j(M)} y {gamma}{sup {infinity}}{sub ij} los coeficientes de actividad limite de los elementos i y j en los sistemas liquidos (i, M), (j, M) y (i, j). Resulta facil deducir una aplicacion de cuanto antecede a la purificacion de los metales, en particular mediante el metodo llamado de la zona fundida. En efecto, la condicion expuesta permite elegir un elemento j a fin de anadirlo deliberadamente a un metal para facilitar la eliminacion de un elemento i, quedando entendido que resulta facil eliminar subsiguientemente ese elemento j. De esta forma, los autores han comprobado que la adicion de aluminio al berilio facilita la eliminacion del hierro en el proceso de purificacion-del berilio por la tecnica de la zona fundida; en ese caso, el aluminio desempena el papel de portador. (author) [Russian] Avtory rasschityvajut kojefficient raspredelenija Greek-Capital-Letter-Gamma {sub i} mezhdu zhidkoj i tverdoj fazami jelementa i pri nalichii drugih jelementov j v rastvoritele M ( Greek-Capital-Letter-Gamma {sub i} = x'{sub i}/x{sub i}, gDe x'{sub i} and x{sub i} javljajutsja sootvetstvenno atomnymi chastjami i v zhidkoj i tverdoj fazah) na osnove termodinamicheskih svojstv binarnyh sistem tipa: (i ,M); (j, M); (i, j). Avtory pokazyvajut, chto vzaimodejstvija vseh prisutstvujushhih jelementov mogut pri opredelennyh uslovijah okazyvat' sil'noe vlijanie na velichinu kojefficienta Ti . Jeto vlijanie stanet zametnym pri proverke sledujushhego uslovija: {gamma}{sup {infinity}}{sub i(M)}, {gamma}{sup {infinity}}{sub j(M)} > {gamma}{sup {infinity}}{sub ij} gde {gamma}{sup {infinity}}{sub i(M)}, {gamma}{sup {infinity}}{sub j(M)}, {gamma}{sup {infinity}}{sub ij} javljajutsja kojefficientami predel'noj aktivnosti sostavnyh i i j v sistemah, nahodjashhihsja v zhidkom sostojanii: (i, M); (j, M) i (i, j). Iz jetogo legko sdelat' vyvod o primenenii k ochistke metallov, v chastnosti metodom tak nazyvaemoj

  5. The use of radioactive tracers in lubrication and wear research; Emploi des indicateurs radioactifs dans les recherches sur la lubrification et l'usure; Ispol'zovanie mechenykh atomov pri issledovanii voprosov smazki i iznosa; Utilizacion de los indicadores radiactivos en los estudios sobre la lubricacion y el desgaste

    Energy Technology Data Exchange (ETDEWEB)

    Campbell, R B; Grunberg, L; Milne, A A; Wright, K H.R. [Lubrication, Wear and Mechanical Engineering Aspects of Corrosion Division, National Engineering Laboratory, Thorntonhall, Glasgow (United Kingdom)

    1962-01-15

    chastitsy okisi zheleza ispol'zuyutsya dlya izucheniya ikh roli v protsesse iznosa. Reaktivnost' poverkh- nosti zakalennykh metallov izuchalas' s pomoshch'yu mechennoj uglerodom-14 stearinovoj kisloty i rastvora sery-35. Skorost' reaktsii v primesi masla dlya shesteren analizirovalas' putem propuskaniya korotkikh impul'sov ehlektrotoka po metallicheskim provodam, opushchennym v rastvory soedinenij, mechennykh seroj-35 i fosforom-32. Sozdanie stojkikh k istiraniyu plenok na poverkhnosti zub'ev shesterenok izuchalos' kak funktsiya nagruzki, skorosti i vremeni raboty. Vopros, vstrechayushchijsya vo mnogikh iz vidov ehtogo primeneniya, sostoit v prevrashchenii izmeryaemoj aktivnosti v absolyutnye kolichestva materialov, prisutstvuyushchikh na poverkhnosti plenok ili v produktakh iznosa. Dlya ehtoj zhe tseli ispol'zovalis' metody kalibrovaniya. (author)

  6. The Role of Diffusion Measurements in the Study of Crystal Lattice Defects; Role des Mesures de la Diffusion dans l'Etude des Defauts des Reseaux Cristallins; Rol' diffuzionnykh izmerenij v izuchenii defektov kristallicheskikh reshetok.rol' diffuzionnykh izmerenij v izuchenii defektov kristallicheskikh reshetok; Las Mediciones de la Difusion en el Estudio de Defectos de los Reticulados Cristalinos

    Energy Technology Data Exchange (ETDEWEB)

    Kidson, G. V. [Chalk River Nuclear Laboratories, ON (Canada)

    1966-02-15

    aluminiopuros, y el mecanismo de difusion se interpreta en terminos de la estructura del reticulado compuesto. Los resultados indican que el ZrAl{sub 3} forma un reticulado con defectos, lo que conduce a la migracion relativamente rapida de los atomos de aluminio. (author) [Russian] Izmerenie podvizhnosti atomov v tverdyh telah chasto predstavljaet neposredst- vennyj interes dlja lic, zanimajushhihsja konstruirovaniem, razrabotkoj i ispol'zovaniem materialov v tehnike. Odnako v nastojashhee vremja vse bol'shee vnimanie udeljaetsja izucheniju takih svojstv s uchetom nalichija i haraktera tochechnyh i linejnyh defektov v kristallah. Rassmatrivajutsja nekotorye poslednie issledovanija diffuzii, provedennye v Jadernyh labora- torijah Chok-River, kotorye ne tol'ko dajut dannye, predstavljajushhie interes dlja jader- noj tehnologii, no i pozvoljajut bolee fundamental'no ponjat' harakter defektov reshetok, vstrechajushhihsja v materialah. Rassmatrivaemymi sistemami javljajutsja: 1) samodiffuzija v vysokotemperaturnoj faze chistogo cirkonija; 2) diffuzija rastvorennogo veshhestva v svin- ce i 3) vzaimnaja diffuzija aljuminija i cirkonija. Kratko rassmatrivajutsja neobychnye i v nastojashhee vremja ne polnost'ju ponjatye rezul'taty, soderzhashhiesja v punkte 1). Privodjatsja dannye, kotorye dajut osnovanie predpolagat', chto diffuzija proishodit ili cherez plot- nuju sistemu dislokacii, obrazovavshujusja v rezul'tate transformacii martensitovoj fazy, ili cherez izbytochnye vakansii v kristalle, svjazannye s primesjami. Vo vtorom punk- te budet obsuzhdat'sja vopros o chrezvychajno bystroj diffuzii rastvorennyh blagorodnyh metallov v monokristallah svinca vysokoj chistoty s tochki zrenija sostojanija atomov rastvo- rennogo veshhestva. Pokazano, chto ih diffuzionnoe povedenie mozhet byt' ponjato, esli predpolozhit', chto frakcija f{sub i} atomov rastvorennogo veshhestva zanimaet mezhdouzlija. Izmerennyj kojefficient diffuzii Ot s v jazans kojefficientom mezhdouzlovoj diffuzii otno- sheniem

  7. Some Applications of Short-Lived Radioisotopes in the Study of Metals; Applications Diverses des Radioelements de Courte Periode dans l'Etude des Metaux; РАЗЛИЧНЫЕ ПРИМЕНЕНИЯ КОРОТКОЖИВУЩИХ РАДИОЭЛЕМЕНТОВ ПРИ ИССЛЕДОВАНИЯХ МЕТАЛЛОВ; Aplicaciones de los Radioelementos de Periodo Corto en el Estudio de los Metales

    Energy Technology Data Exchange (ETDEWEB)

    Kohn, A. [Institut de Recherches de la Siderurgie, Saint-Germain-en-Laye (France)

    1963-03-15

    despues de la colada. En muchos de estos lingotes, se registraron corrientes de conveccion de intensidad suficiente para distribuir el oro por gran parte del volumen del lingote una hora despues de terminada la colada. (author) [Russian] V jetom doklade izlagaetsja nekotorye tipichnye vidy primenenija korotkozhivushhih radiojelementov pri issledovanii metallov. Razrabotan prostoj metod aktivacionnogo analiza dlja opredelenija soderhanija lantana v razlichnyh markah stali, k kotoroj vo vremja plavki dobavljaetsja neznachitel'noe kolichestvo neochishhennoj smesi redkozemel'nyh jelementov. Issledovalos' povedenie mysh'jaka v period okislenija zheleza s cel'ju izuchit', kak vedut sebja neznachitel'nye kolichestva soderzhashhegosja v zheleze mysh'jaka v jetot period. S pomoshh'ju avtoradiografii bylo ustanovleno prezhde vsego znachitel'noe obogashhenie mysh'jakom poverhnosti razdela metall-okis'. V rezul'tate primenenija metoda, zakljuchajushhegosja v aktivirovanii okislennyh obrazcov v jader- nom reaktore i rastvorenii obrazujushhihsja sloev tolshhinoj v neskol'ko mikron, predstavilos' vozmozhnym izuchit' dannoe javlenie v kachestvennom otnoshenii. Udalos' proverit', chto mysh'jak koncentriruetsja v metalle rjadom s poverhnost'ju razdela, gde ego koncentracija mozhet v 30 - 40 raz prevyshat' pervonachal'noe soderzhanie primesi. S pomoshh'ju avtoradiografii issledovalsja prirost metallicheskih kristallov, s uchetom togo, chto tverdoe telo bolee bedno legirujushhimi jelementami po sravneniju s rasplavom, iz kotorogo ono obrazuetsja. Jeto issledovanie kasalos' medlenno ohlazhdaemyh splavov alljuminija i medi, kotorye zatem poluchali zakalku v processe zatverdenija. Issledovanie pozvolilo vyjavit' konfiguraciju metallicheskih kristallov na razlichnyh stadijah ih prirosta i ustanovit' zavisimost' processa zatverdenija ot izmenenija temperatury splava, izmerjaemoj s pomoshh'ju termopary. Izuchenie konvektivnyh tokov v bol'shih slitkah dlja pokovki imelo cel'ju podtverdit' nalichie

  8. Radioactive Metrology Methods in the USSR; Methodes de metrologie de la radioactivite en URSS; Metody metrologii radioaktivnosti v SSSR; Metodos de Metrologia de la Radiactividad Aplicados en la Union de Republicas Socialistas Sovieticas

    Energy Technology Data Exchange (ETDEWEB)

    Aglintsev, K K; Bochkarev, V V; Grablevskij, V N; Karavaev, F M

    1960-06-15

    }-istochniki prigotovlyayuts ya iz radionuklidov , vybrannykh takim obrazom, chtoby obespechit' diapazon ehnergij ot 0,018 mehv do 2,3 mehv. Kontrol'nye {beta}-istochniki prigotovlyayuts ya libo iz strontsiya-90 plyus ittrij-90, libo iz talliya-204, libo iz prometiya-147. EHti istochniki okhvatyvayut shirokij diapazon aktivnosti ot 20 do 10{sup 9} raspadov v minutu. Model'nye {gamma}-istochniki prigotovlyayuts ya libo iz radiya, libo iz kobal'ta-60, libo iz tseziya-137. diapazon aktivnostej ehtikh ehtalonov okhvatyvaet velichiny ot 10-{sup 11} do 5 grammov-ehkvivalento v radiya. Kontrol'nye u-istochniki prigotovlyayuts ya iz vysheukazanny kh radionuklidov. Aktivnosti okhvatyvayut ochen' shirokij diapazon, poskol'ku istochniki imeyut ves'ma razlichnuyu formu i razmery. Nakonets, model'nye istochniki nejtronov byvayut dvukh vidov: radija-{alpha}-berillij (soderzhashchij ot 1 do 1000 mg radiya) i plutonij-{alpha}-berilli j (soderzhashchij ot 0,01 do 15 grammov plutoniya). Istochniki radij-{alpha}-berilli j prigotovlyayutsya iz pressovannoj smesi RaBr{sub 2} i poroshkovogo berilliya s vesovym sootnosheniem Ra/Be = 1/6. Istochniki plutonij-a-berilli j obrazuyutsya iz splava (PuBe{sub 13}) ehtikh dvukh metallov. (author)

  9. Comparative Studies of Chemical Effects following Nuclear Reactions and Transformations on Metal Organic Phenyl Compounds; Etudes Comparatives des Effets Chimiques Induits par les Reactions et les Transformations Nucleaires sur des Composes Phenylmetalliques; 0421 0420 0410 0414 ; Estudios Comparativos de los Efectos Quimicos de las Reacciones y Transformaciones Nucleares en Compuestos Fenil-Organometalicos

    Energy Technology Data Exchange (ETDEWEB)

    Merz, E.; Riedel, H. J. [Kernforschungsanlage, Juelich, Federal Republic of Germany (Germany)

    1965-04-15

    retroceso secundarios (interacciones elasticas e inelasticas), entre ellas la influencia peculiar del oxigeno. (author) [Russian] Izuchenie himicheskih jeffektov, sozdavaemyh v processe jadernyh reakcij atomami otdachi bol'shoj jenergii v tverdyh telah i zhidkostjah, provodilos' na osnovanii shirokogo sopostavlenija produktov, obrazovannyh reakcijami (p,{gamma}) i (p, 2p) v soedinenijah fenila s metallami , kak to: germaniem, olovom, svincom, mysh'jakom i sur'moj. V dopolnenie k jetomu radioaktivnye produkty otdachi, obrazovannye posle K-zahvata na tetrafenile germanija-68, sravnivajutsja s rezul'tatami reakcii (p,7) na trifenile gallija i reakcii (p, {gamma}) na tetrafenile germanija. Nakonec, jeto issledovanie rasprostranilos' na {beta}{sup -}-perehod tetrafenila germanija-77 v mysh'jak-77. S pomoshh'ju razlichnyh metodov otdelenija, naprimer, hromatografii adsorbcii na glinozeme, ionnogo obmena i jelektroforeza byli otdeleny razlichnye radioaktivnye produkty otdachi i opredeleny vyhody kazhdogo iz nih. Ustanovleno, chto v jadernyh reakcijah soedinenij vysheupomjanutyh metallov, imejushhih odinakovuju strukturu svjazej, obrazujutsja pochti te zhe kategorii produktov otdachi. Odnako raspredelenie vyhodov obnaruzhivaet harakternye rashozhdenija mezhdu reakcijami (p,{gamma}) i reakcijami (p, 2p). Obnaruzhivaetsja tol'ko neznachitel'noe vlijanie obluchenija na vyhody pri vozdejstvii ego sootvetstvenno na zhidkosti i rastvory. Porazhajut znachitel'nye rashozhdenija, obnaruzhivaemye dlja novyh soedinenij, poluchennyh v rezul'tate jadernyh prevrashhenij; jeti rashozhdenija kasajutsja ne tol'ko vida tipichnyh produktov, no takzhe i procentnoj doli ih vyhoda. Tak, naprimer, rjad produktov otdachi germanija i gallija metalloorganicheskogo haraktera byli obnaruzheny v jadernyh reakcijah na tetrafenile germanija-77, chego vovse ne nabljudalos' pri processah K-zahvata na tetrafenile germanija-68. {beta}{sup -}-raspad na tetrafenile germanija-77 vedet k obrazovaniju pochti takih zhe

  10. Strain Dependence of the Frequencies and the Thermal Expansion of the Hexagonal Close-Packed Lattice; Variations, en Fonction de la Deformation, des Frequences et de la Dilatation Thermique du Reseau a Structure Hexagonale Compacte; Zavisimost' chastot i teplovogo rasshireniya geksagonal'noj reshetki s plotnoj upakovkoj ot napryazheniya; Variacion de las Frecuencias y de la Dilatacion Termica de la Red Hexagonal Compacta en Funcion de la Deformacion

    Energy Technology Data Exchange (ETDEWEB)

    Srinivasan, R.; Ramji Rao, R. [Physics Department, Indian Institute of Technology, Madras (India)

    1965-04-15

    {gamma}'' Para tres pares de valores de m y n. Se ha comprobado que {gamma}' = {gamma}'' y que el limite superior de temperatura {gamma}{sub {infinity}} mayor en 0,3, aproximadamente, que el limite inferior de temperatura{sup .} Esta diferencia cuya magnitud parece ser independiente de los valores de m y n, disminuira probablemente al tener en cuenta la interaccion de atomos vecinos mas alejados. Los datos teoricos se comparan con los resultados experimentales obtenidos en el caso del magnesio. (author) [Russian] Nedavno bylo izmereno anizotropnoe teplo voe rasshirenie nekotoryh geksagonal'nyh metallov. Dlja razrabotki teorii anizotropnogo teplovogo rasshirenija geksagonal'noj reshetki s plotnoj upakovkoj neobhodimo issledovat' zavisimost' chastot geksagonal'noj reshetki s plotnoj upakovkoj ot naprjazhenija. Rassmatrivalas' geksagonal'naja reshetka s plotnoj upakovkoj s central'nym vzaimodejstviem s bli- a b zhajshim sosednim atomom v vide Empty-Set = -a/{gamma}{sup m} + b/{gamma}{sup n} Ispol'zuemymi naprjazhenijami javljajutsja 1) prodol'noe rasshirenie #Greek Lunate Epsilon Symbol#' vdol' osi z; i 2) ravnomernoe vozdushnoe rasshirenie {zeta} vdol' osnovnoj ploskosti. Oni javljajutsja sootvetstvujushhimi naprjazhenijami v teorii teplovogo rasshirenija,i ih preimushhestvom javljaetsja to, chto oni ne vyzyvajut smeshhenij mezhdu reshetkami. Byli razrabotany parametry Grjunajzena {gamma}'{sub i} = - Partial-Differential log{omega}{sub i}/ Partial-Differential #Greek Lunate Epsilon Symbol#' and {gamma}'{sub i}' = - Partial-Differential log{omega}{sub i}/ Partial-Differential {zeta} Dlja volnovyh vekto- J rov, idushhih vdol' opredelennyh simmetrichnyh napravlenij. Bylo ustanovleno, chto jeti parametry dlja akusticheskih vetvej sil'no zavisjat ot napravlenija i sil'no kolebljutsja. Odna iz poperechnyh akusticheskih vetvej v osnovnoj ploskosti imeet otricatel'noe znachenie {gamma}' dlja ljubyh znachenij ship. Byla opredelena zavisimost' momentov {mu}{sub 2}, {mu}{sub 4} i {mu

  11. Comparison of Alkali Plasma Loss Rates in a Stellarator and in a Toroidal Device with Minimum Mean-B Properties; Comparaison des Taux de Perte d'un Plasma Alcalin dans un Stellarator et dans un Appareil Toroidal Ayant des Proprietes de B Moyen Minimum; Comparaison des Taux de Perte d'un Plasma Alcalin dans un Stellarator et dans un Appareil Toroidal Ayant des Proprietes de B Moyen Minimum; СРАВНЕНИЕ СКОРОСТЕЙ ПОТЕРЬ ЩЕЛОЧНОЙ ПЛАЗМЫ В СТЕЛЛАРАТОРЕ И В ТОРОИДАЛЬНОЙ УСТАНОВКЕ С МИНИМУМОМ СРЕДНЕГО В; Comparacion de las Velocidades de Perdida de Plasmas Alcalinos en un Stellarator y en un Aparato Toroidal con Propiedades de B Medio Minimo

    Energy Technology Data Exchange (ETDEWEB)

    Eckhartt, D.; Von Gierke, G.; Grieger, G. [Max-Planck-Institut fuer Physik und Astrophysik, Munich, Federal Republic of Germany (Germany)

    1966-04-15

    vintovymi obmotkami issledovalos' uderzhanie plazmy s nizkim znacheniem Je pri otsutstvii omicheskih tokov. V rezul'tate jetih jeksperimentov polucheny dokazatel'stva togo, chto poverhnosti postojannogo davlenija skoree sovpadajut s poverhnostjami postojannogo V, chem s magnitnymi poverhnostjami, chto obychno ozhidalos' by dlja stellaratora v magnitogidrodinamicheskom ravnovesii. My postavili takzhe jeksperimenty na stellaratore s dvuhzahodnymi obmotkami, kotorye obespechivajut postojannoe vrashhatel'noe preobrazovanie vseh silovyh linij uderzhivajushhego magnitnogo polja. Dlja obespechenija ravnovesija v stellaratore, v kotorom uderzhivajushhee pole imeet glavnym obrazom azimutal'noe napravlenie, neobhodimy vtorichnye toki, a takzhe makroskopicheskie dvizhenija massy vdol' silovyh linij. Odnako v toroidal'noj ustanovke s azimutal'noj simmetriej s chisto meridional'nym magnitnym polem ravnovesija mozhno dostignut' bez kakih-libo tokov ili makroskopicheskih dvizhenij vdol' V. Krome togo, ustojchivost' otnositel'no zhelobkovyh vozmushhenij na poverhnosti plazmy mozhno obespechit' dlja plazmy s nizkim znacheniem {beta}, ecm {nabla} Contour-Integral d Script-Small-L /B napravleno parallel {nabla}p. My postroili ustanovku s vysheukazannymi svojstvami. Ona sostoit glavnym obrazom iz chetyreh tokonesushhih kol'cevyh provodnikov, pogruzhennyh v plazmu (analogichno sisteme Okava i d r . ) . Provodniki pitajutsja postojannymi tokami s tem, chtoby izbezhat' obrazovanija azimutal'no napravlennyh jelektricheskih polej v plazme. Izuchaetsja uderzhanie plazmy v jetoj ustanovke s pomoshh'ju termicheskoj plazmy shhelochnyh metallov, kotoraja poluchaetsja v rezul'tate kontaktnoj ionizacii. Mozhno vybrat' takie rabochie uslovija, pri kotoryh poteri v plazme v rezul'tate ''klassicheskih'' mehanizmov (stolknovitel'naja diffuzija na stenki i kol'cevye provodniki, poteri chastic na derzhateljah, ob{sup e}mnaja rekombinacija it.d. ) stanovjatsja neznachitel'nymi po sravneniju s bol

  12. Use of Short-Lived Radioisotopes to Determine Impurities in Aluminium, Iron and Zirconium of Very High Purity; Dosages d'Elements par leurs Radioisotopes de Periodes Courtes Dans l'Analyse de Valuminium, du Fer et du Zirconium de Tres Hautes Puretes; ДОЗИРОВКА ЭЛЕМЕНТОВ С ПОМОЩЬЮ КОРОТКОЖИВУЩИХ РАДИОИЗОТОПОВ ПРИ АНАЛИЗЕ АЛХМИНИЯ, ЖЕЛЕЗА И ЦИРКОНИЯ ОЧЕНЬ ВЫСОКОЙ ЧИСТОТЫ; Determinacion Cuantitativa de Radioisotopos de Periodo Corto en los Analisis de Aluminio, Hierro y Circonio de Alta Pureza

    Energy Technology Data Exchange (ETDEWEB)

    Albert, Ph.; Deyris, M.; Deschamps, N.; Fournet, L. [Centre d' Etudes de Chimie Metallurgique, Vitry (France)

    1963-03-15

    que siguen a la irradiacion (caso del aluminio). Los autores hacen notar que sin separacion previa han logrado determinar por espectrometria {gamma} concentraciones de 0,6 * 10{sup -6}de vanadio y 2 * 10{sup -6} de aluminio en el hierro o el circonio puros irradiados durante 30 s con un flujo de 5 * 10{sup 1{sup 2}}n/cm{sup 2}s. Las separaciones antes de la irradiacion son necesarias para alcanzar sensibilidades mayores y tambien en el caso de los metales de menor pureza. En la memoria se pone de relieve la importante contribucion que aportan las determinaciones cuantitativas con ayuda de radioisotopos de periodo corto (2,4 min a 4,6 h) al conocimiento del grado de pureza de las muestras. (author) [Russian] V laboratorii professora Shodroka i Vitri my oznakomilis' s sistematicheskim analizom putem 'radioaktivacii' takih metallov ochen' vysokoj chistoty, kak Aljuminij, zhelezo, cirkonij i med', ochishhennyh pri pomoshhi metoda 'zonnoj plavki', a takzhe metallov promyshlennogo naznachenija vysokoj chistoty. K poslednim otnosjatsja ochishhennyj dvojnym jelektrolizom aljuminij, ochishhennaja jelektrolizom med', poluchennyj metodom termicheskoj dissociacii iodida cirkonij i vydelennoe v chistom vide iz karbonilovogo soedinenija zhelezo. Dlja provedenija jetih analizov my ispol'zovali obluchenie nejtronami, dejtronami, protonami i {gamma}- tonami jenergiej 30 Mjev v celjah dozirovki kisloroda, ugleroda i azota. Sistematicheskij analiz posle obluchenija nejtronami ogranichen pjat'judesjat'ju jelementami. Dejstvitel'no, nekotorye izotopy javljajutsja slishkom korotkozhivushhimi, naprimer vanadij-52 (3,7 min), hlorke (37,5 min), Jod-128 (25 min), aljuminiJ-28 (2,4 min), magnij-27 (9,5 min), titan-51 (5,8 min). V otnoshenii drugih jelementov ne predstavljaetsja vozmozhnym s dostatochnoj chuvstvitel'nost'ju i v ramkah sistematicheskogo analiza predusmotret' ih vydelenie i dozimetriju. Imenno tak obstoit delo v sluchae s kremnem-28 pri ego periode v 2,8 chasa (slaboe jeffektivnoe

  13. Determination of the Uranium Content of Aluminium Alloys; Determination de la Teneur en Uranium dans les Alliages a Base d'Aluminium; Opredelenie soderzhaniya urana v splavakh na osnove alyuminiya; Determinacion del Contenido de Uranio en las Aleaciones a Base de Aluminio

    Energy Technology Data Exchange (ETDEWEB)

    Gerard, J.; Van Hove, L. [S.A. Metallurgie et Mecanique Nucleaires Dessel (Belgium)

    1965-09-15

    determinacion de su contenido exacto de uranio-235 se efectua mediante analisis quimicos e isotopicos. El control, cuando las operaciones se reaUzan a una cadencia industrial, se hace midiendo la densidad de la aleacion o contando los rayos gamma emitidos por el uranio-235. Ambos metodos permiten obtener resultados de una precision relativa comparable ({+-} 0,5%). Desde el punto de vista economico, se puede recomendar la determinacion del contenido por recuento de la emision gamma, siempre que sea necesario llevar a cabo muchos examenes de piezas de una forma determinada. (author) [Russian] Vo mnogih reaktorah dlja ispytanija materialov splav aljuminija i obogashhennogo urana ispol'zuetsja v kachestve topliva. Kolichestvo urana-235 v kazhdom toplivnom jelemente dolzhno byt' tochno izvestno. Ispol'zovannye dlja jetogo opredelenija metody prosty v principe i k tomu zhe raznoobrazny. Privodjatsja sledujushhie metody: izmerenie plotnosti splava, otschet gamma-izluchenija urana-235, himicheskij analiz, opredelenie izotopnogo soderzhanija i ocenka potemnenija radiograficheskogo snimka. K sozhaleniju, kazhdyj iz jetih metodov stradaet bolee ili menee ser'eznymi nedostatkami na praktike, kogda jeto kasaetsja kontrolja vazhnoj produkcii. Izmerenie plotnosti splava metodom Arhimeda daet dostatochno tochnye rezul'taty, esli jetot metod primenjaetsja ostorozhno i esli tochno izvestna plotnost' sostavnyh metallov. Vmeste s tem, na praktike jetot metod javljaetsja ochen' medlennym. Krome togo, nado ochen' tochno znat' izotopnoe soderzhanie, chtoby opredelit' kolichestvo urana-235. Registracija gamma-aktivnosti urana-235 pozvoljaet neposredstvenno davat' ocenku jetomu izotopu. Odnako mnogie parametry odnokanal'nogo spektrometra obuslovlivajut primenenie horosho izvestnyh jetalonov i sozdanija iskljuchitel'noj ustojchivosti registracii. I vse zhe, po nashemu mneniju, jetot metod javljaetsja naibolee celesoobraznym dlja analizov v promyshlennom masshtabe. S drugoj storony, vybor jetalonov