Sample records for vozbuzhdennykh sostoyanij 217at

  1. Studies of α-spectra in 221Fr, 217At, 213Bi and 213Po decays

    International Nuclear Information System (INIS)

    Chumin, V.G.; Fominykh, V.I.; Furyaev, T.A.; Gromov, K.Ya.; Jabber, J.K.; Kalyapkin, K.V.; Kudrya, S.A.; Tsupko-Sitnikov, V.V.


    The alpha-recoil phenomenon is used to gain data on the weak components of the α-spectra of the nuclides from the 225 Ac equilibrium chain. It is established that there is no experimental basis for introducing the 450 keV level of 213 Bi in the 217 At decay and the 868 keV level of 209 Tl in the 213 Bi decay. Excitation of the 759 keV level in the 217 At decay is confirmed. The intensities of the 221 Fr, 217 At and 213 Bi β - -decay are measured

  2. Decay analysis of compound nuclei formed in reactions with exotic neutron-rich 9Li projectile and the synthesis of 217At* within the dynamical cluster-decay model (United States)

    Kaur, Arshdeep; Kaushal, Pooja; Hemdeep; Gupta, Raj K.


    The decay of various compound nuclei formed via exotic neutron-rich 9Li projectile is studied within the dynamical cluster-decay model (DCM). Following the earlier work of one of us (RKG) and collaborators (M. Kaur et al. (2015) [1]), for an empirically fixed neck-length parameter ΔRemp, the only parameter in the DCM, at a given incident laboratory energy ELab, we are able to fit almost exactly the (total) fusion cross section σfus =∑x=16σxn for 9Li projectile on 208Pb and other targets, with σfus depending strongly on the target mass of the most abundant isotope and its (magic) shell structure. This result shows the predictable nature of the DCM. The neck-length parameter ΔRemp is fixed empirically for the decay of 217At* formed in 9Li + 208Pb reaction at a fixed laboratory energy ELab, and then the total fusion cross section σfus calculated for all other reactions using 9Li as a projectile on different targets. Apparently, this procedure could be used to predict σfus for 9Li-induced reactions where experimental data are not available. Furthermore, optimum choice of "cold" target-projectile combinations, forming "hot" compact configurations, are predicted for the synthesis of compound nucleus 217At* with 8Li + 209Pb as one of the target-projectile combination, or another (t , p) combination 48Ca + 169Tb, with a doubly magic 48Ca, as the best possibility.

  3. Design and characteristics of beta-excited X-ray sources; Caracteristiques des sources de rayons X excitees par des particules beta; Konstruktsiya i kharakteristiki beta-vozbuzhdennykh istochnikov rentgenovskikh luchej; Diseno y caracteristicas de las fuentes de rayos X excitadas por particulas beta

    Energy Technology Data Exchange (ETDEWEB)

    Filosofo, I; Reiffel, L; Stone, C A; Voyvodic, L [Physics Division, Armour Research Foundation, Chicago, IL (United States)


    The paper reports on recent work on beta-excited X-ray sources. Results of detailed experimental investigation on the X-rays produced by the fission products Pm{sup 147}, Kr{sup 85} and Sr{sup 90} are described. X-ray yields and spectral distributions have been studied for target materials ranging from copper to uranium and in a variety of source-target geometries (transmission target, reflection target, sandwich target, intimate source-target mixtures). To interpret the experimental results, an analytical treatment of the processes involved in X-ray production by beta particles has been developed and is outlined. By taking into account bremsstrahlung, K-shell ionization, and fluorescent X-ray excitation, a convenient mathematical formulation may be derived for photon spectra and yields as functions of maximum {beta}-energy, target thickness and source configuration. The agreement between calculated and experimentally determined yields is excellent and confirms the merit of the analysis. It thus becomes possible to optimize the design of isotopic X-ray sources for specific applications. Kr{sup 85} and Pm{sup 147} prototype sources have been designed and 'their performance in thickness and composition-analysis measurements is discussed. A high level Pm{sup 147} source for industrial radiography has also been designed and its performance, along with the utility of image intensifiers to extend its applicability, is considered. Finally, a general review of potentialities, advantages and limitations of isotopic X-ray sources is given. (author) [French] Le memoire rend compte des recents travaux sur les sources de rayons X excitees par des particules beta. Il donne les resultats d'une etude experimentale detaillee sur les rayons X emis par les produits de fission {sup 147}Pm, {sup 85}Kr et {sup 90}Sr. Les auteurs ont etudie l'emission et la distribution spectrale des rayons X pour des cibles allant du cuivre a l'uranium, et ce dans plusieurs geometries source-cible differentes, a savoir : etude en transmission, en retrodiffusion, en , et enfin avec source et cible intimemement liees. Pour interpreter les resultats des experiences, les auteurs ont mis au point une analyse des processus qui interviennent dans la production des rayons X par les particules beta; ils en font l'expose. En tenant compte du rayonnement de freinage, de l'ionisation de la couche K et de fluorescence provoquee par les rayons X, il est possible de degager une formule mathematique commode pour les spectres et les nombres de photons emis, en fonction de l'energie beta maximum, de l'epaisseur de la cible et de la configuration de la source. En ce qui concerne les nombres de photons emis, les resultats de l'experience concordent parfaitement avec ceux des calculs theoriques, ce qui confirme la valeur de l'analyse. Il devient ainsi possible de mettre au point des sources de rayons X isotopiques repondant aux exigences des applications auxquelles elles sont destinees. On a construit des sources prototypes de {sup 85}Kr et de {sup 147}Pm; les auteurs en etudient l'efficacite pour les mesures d'epaisseur et les analyses de composition. Ils examinent aussi le comportement d'une source de {sup 147}Pm de grande intensite, mise au point pour Le memoire rend compte des recents travaux sur les sources de rayons X excitees par des particules beta. Il donne les resultats d'une etude experimentale detaillee sur les rayons X emis par les produits de fission {sup 147}Pm, {sup 85}Kr et {sup 90}Sr. Les auteurs ont etudie l'emission et la distribution spectrale des rayons X pour des cibles allant du cuivre a l'uranium, et ce dans plusieurs geometries source-cible differentes, a savoir : etude en transmission, en retrodiffusion, en , et enfin avec source et cible intimemement liees. Pour interpreter les resultats des experiences, les auteurs ont mis au point une analyse des processus qui interviennent dans la production des rayons X par les particules beta; ils en font l'expose. En tenant compte du rayonnement de freinage, de l'ionisation de la couche K et de fluorescence provoquee par les rayons X, il est possible de degager une formule mathematique commode pour les spectres et les nombres de photons emis, en fonction de l'energie beta maximum, de l'epaisseur de la cible et de la configuration de la source. En ce qui concerne les nombres de photons emis, les resultats de l'experience concordent parfaitement avec ceux des calculs theoriques, ce qui confirme la valeur de l'analyse. Il devient ainsi possible de mettre au point des sources de rayons X isotopiques repondant aux exigences des applications auxquelles elles sont destinees. On a construit des sources prototypes de {sup 85}Kr et de {sup 147}Pm; les auteurs en etudient l'efficacite pour les mesures d'epaisseur et les analyses de composition. Ils examinent aussi le comportement d'une source de {sup 147}Pm de grande intensite, mise au point pour la radiographie industrielle, ainsi que l'utilite des renforcateurs d'images, qui permettraient d'en etendre le champ d'application. Enfin, les auteurs passent en revue les possibilites, avantages et limites des sources de rayons X isotopiques. [Spanish] La memoria trata de trabajos realizados recientemente acerca de fuentes de rayos X excitadas por particulas beta. Describe los resultados de una minuciosa investigacion experimental sobre los rayos X generados por los productos de fision {sup 147}Pm, {sup 85}Kr y {sup 90}Sr. Los autores han estudiado los rendimientos en rayos X y las distribuciones espectrales correspondientes a materiales de blanco que abarcan del cobre al uranio, para diversas geometrias fuente-blanco (blancos de transmision, blancos de reflexion, blancos ''sandwich'' y mezclas intimas de la fuente y el blanco). Para interpretar los resultados experimentales, los autores idearon un metodo de analisis de los procesos que intervienen en la produccion de rayos X por excitacion mediante particulas beta; dicho metodo se describe en la memoria. Si se tienen en cuenta la radiacion de frenado (Bremsstrahlung), la ionizacion de la capa K y la fluorescencia provocada por los rayos X, puede lograrse una formulacion matematica satisfactoria para calcular los rendimientos y los espectros fotonicos en funcion de la energia {beta} maxima, del espesor del blanco y de la configuracion de la fuente. Los rendimientos calculados concuerdan perfectamente con los determinados por via experimental, lo que confirma la validez del metodo analitico. De esta forma, resulta posible disenar fuentes isotopicas de rayos X que responden optimamente a las exigencias de las aplicaciones a las que van destinadas. Los autores disenaron prototipos de fuentes de {sup 85}Kr y de {sup 147}Pm, y la memoria analiza su eficacia en las mediciones de espesores y el analisis de sustancias compuestas. Tambien disenaron una fuente de {sup 147}Pm de elevada intensidad destinada a la radiografia industrial; la memoria examina su funcionamiento, asi como la utilidad de los intensificadores de imagen que permiten ampliar el campo de aplicaciones de dicha fuente. Los autores terminan su memoria con un examen general de las posibilidades, ventajas y limitaciones de las fuentes isotopicas de rayos X. (author) [Russian] V dokumente izlagayutsya novejshie rezul'taty rabot nad beta-vozbuzhdennymi istochnikami rentgenovskikh luchej. Opisyvayutsya rezul'taty podrobnogo ehksperimental'nogo issledovaniya rentgenovskikh luchej, proizvodimykh produktami deleniya Rt-147, Kg-85 i Sr-90. Vykhod rentgenovskikh luchej i spektral'noe raspredelenie byli izucheny dlya mishenej, postroennykh iz materialov, idushchikh ot medi do urana, a takzhe dlya raznoobraznogo vzaimnogo raspolozheniya istochnika i mishenej: (propuskayushchaya mishen', otrazhayushchaya mishen', 'sloenaya'' mishen', tesnoperemeshannye istochniki i mishen'). Osobenno podrobno byla izuchena smes' iz prometiya-147 s okis'yu samariya dlya vyyasneniya perspektiv ispol'zovaniya istochnika vysokogo urovnya, v kotorom sam prometij-147 yavlyaetsya glavnoj mishen'yu rentgenovskikh luchej. Detektirovanie rentgenovskikh luchej proizvodilos' pri pomoshchi stsintillyatsionnykh i proportsional'nykh schetchikov sovmestno s 256-kanal'nym amplitudnym analizatorom impul'sov. Dlya istolkovaniya ehksperimental'nykh dannykh bylo vyrabotano i opisano analiticheskoe vyrazhenie protsessov obrazovaniya rentgenovskikh luchej beta-chastitsami. Esli uchest' tormoznoe izluchenie, obolochechnuyu K-ionizatsiyu i flyuorestsiruyushchee vozbuzhdenie rentgenovskikh luchej, to mozhno vyvesti podkhodyashchuyu matematicheskuyu formulu dlya opredeleniya spektra i vykhoda fotonov v funktsii ot maksimal'noj beta-ehnergii, tolshchiny misheni i konfiguratsii istochnika. Poluchaetsya otlichnoe sovpadenie raschetnykh rezul'tatov s ehksperimental'no poluchennymi vykhodami, chto podtverzhadaet tsennost' ehtogo sposoba analiza. Takim obrazom otkryvaetsya vozmozhnost' dlya optimizatsii konstruktsii izotopnykh istochnikov rentgenovskikh luchej v otnoshenii tekh ili inykh primenenij. Byli skonstruirovany prototipnye istochniki kriptona-85 i prometiya-147 i obsuzhdayutsya poluchennye s nimi rezul'taty izmerenij tolshchiny i analiza sostava. Byl takzhe skonstruirovan istochnik prometiya-147 vysokogo urovnya dlya promyshlennoj radiografii i obsuzhdayutsya rezul'taty ispol'zovaniya ehtogo istochnika, a takzhe tselesoobraznost' primeneniya usilitelej izobrazheniya, chto dolzhno eshche bol'she rasshirit' oblast' primeneniya ehtogo metoda. Nakonets, daetsya obshchij obzor vozmozhnostej, preimushchestv i ogranichenij izotopnykh istochnikov rentgenovskikh luchej. (author)

  4. Reactions of Hot Hydrogen Atoms with Ethylene. The Role of Excited Ethyl Radicals as Intermediate Products; Reactions des Atomes Chauds d'Hydrogene avec l'Ethylene. Le Role des Radicaux Ethyle Excites Comme Produits Intermediaires; Reaktsiya goryachikh atomov vodoroda s ehtilenom. Rol' vozbuzhdennykh ehtil'nykh radikalov kak promezhutochnykh produktov; Reacciones de Atomos Calientes de Hidrogeno con Etileno Papel de los Radicales Etilicos Excitados como Productos Intermedios

    Energy Technology Data Exchange (ETDEWEB)

    Dzantiev, B. G.; Shvedchikov, A. P. [Institut Himicheskoj Fiziki AN SSSR, SSSR (Russian Federation)


    It is well known that the nuclear reactions Li{sup 6}(n, {alpha})T and He{sup 3}(n, p) T result in the formation of hot atoms of radioactive hydrogen. The characteristics of the chemical consequences of nuclear transformations are largely determined by the high chemical activity of such atoms. However, hydrogen atoms can play an essential role not only in nuclear chemistry but also in other branches of high-energy chemistry, such as radiolysis and photolysis. In the present research we attempted to make a comparative study of the behaviour of hot hydrogen atoms obtained in various ways: by the Li{sup 6} (n, {alpha})T reaction (recoil energy = 2.7 MeV); by radiolysis (E{approx} a few eV); by photolysis (E{approx} 1 - 1,5 eV; hot hydrogen is obtained from HI by photolysis at {lambda} = 2537A). In order to obtain tritium atoms, we used crystals and films of Li{sub 2}Co{sub 3}, Li{sup 6}F, Li{sup 6}OH, Li{sup 6}BO{sub 2} * 8H{sub 2} as targets. Gaseous ethylene (P = 5-10 atm) and its mixtures with ammonia, helium and inhibitors, were subjected to radiation. Radiation was carried out on an IRT-1000 reactor with a thermal neutron flux of 10{sup 11} - 10{sup 12} a/cm{sup 2} * s. Tritium-labelled compounds and products of radiation chemistry reactions were identified by gas chromatography involving the use of two monitoring units connected in series (a katharometer and a G-M flow counter). It is shown that the spectrum of labelled and unlabelled products in irradiated ethylene is very distinct. The main labelled products are C{sub 2}H{sub 2}, C{sub 2}H{sub 6}, C{sub 4}H{sub 10} and hydrocarbons > C{sub 4}; the H{sub 2} yield is small. The main unlabelled products are HT, C{sub 2}H{sub 3}T and C{sub 4}H{sub 9}T; the yield of C{sub 2}H{sub 5}T and especially of C{sub 2}HT is insignificant. The labelled-compound yields are dependent on the introduction of additives (ammonia, helium, iodine) into the ethylene, on the type of lithium-containing compound and on the structure of the target. Lowering the temperature from 50 Degree-Sign C to -78 Degree-Sign C has little effect on the distribution of labelled products; however, in the transition to heavy ethylene (-196 Degree-Sign C) a phase effect is observed; the HT and C{sub 4}H{sub 9}T yield decreases and the activity of the parent compound C{sub 2}H{sub 3}T increases, In the radiolysis of C{sub 2}H{sub 4} and its mixtures with ammonia the ratio C{sub 2}H{sub 6}/C{sub 4}H{sub 10} is equal to 1.0 {+-} 0.3, which does not agree with the standard scheme for disproportionation and recombination reactions of thermal ethylene radicals (C{sub 2}H{sub 6}/C{sub 4}H{sub 10} = 0.2 {+-} 0.1). On the basis of data on the effect of helium addition and temperature on C{sub 2}H{sub 6} and C{sub 4}H{sub 10}, yield in the radiolysis of C{sub 2}H{sub 4}, and in the photolysis of mixtures of C{sub 2}H{sub 4} and HI, we were able to get an idea of the formation of excited ethylene radicals of C2H* These are obtained as a result of the addition of hot hydrogen atoms (generated radiolytically or photolytically) to ethylene: H* + C{sub 2}H{sub 4} = C{sub 2}H*{sub 5}. It is shown that the C{sub 2}H*{sub 5} radical easily enters into the stripping reaction C{sub 2}H*{sub 5} + RH = C{sub 2}H{sub 6} + R, which accounts for the ''excess'' quantity of ethane formed in the radiolysis of ethylene [French] On sait qu'a la suite des reactions nucleaires Li{sup 6}(n, {alpha})T et He{sup 3}(n, p) T se forment des atomes chauds de tritium. La forte reactivite chimique de ces atomes determine a maints egards les particularites chimiques des effets dus aux transformations nucleaires. Or, les atomes chauds de tritium peuvent jouer un role important, non seulement en chimie nucleaire, mais aussi dans d'autres domaines de la chimie des hautes energies, notamment dans la radiolyse, la photolyse, etc. Dans le memoire, on essaie de comparer le comportement des atomes chauds de tritium obtenus par les moyens suivants: reaction Li{sup 6} (n, {alpha})T (E{sub sep} = 2,7 MeV); radiolyse (E Tilde-Operator plusieurs eV); photolyse (E Tilde-Operator 1 a 1,5 eV; le tritium se forme par photolyse a partir de H1 pour {lambda} = 2537A). Pour obtenir des atomes de tritium, on a utilise comme cibles des cristaux et des films de Li{sub 2}Co{sub 3}, Li{sup 6}F, Li{sup 6}OH, Li{sup 6}BO{sub 2} * 8H{sub 2}. On a irradie de l'ethylene en phase gazeuse (sous une pression p de 5 a 10 atm) et des melanges de ce corps avec l'ammoniac, l'helium et des inhibiteurs. L'irradiation a eu lieu a l'interieur d'un reacteur du type IRT-1000 dans un flux de neutrons thermiques de 10{sup 11} a 101{sup 12} n/cm{sup 2} * s. Les composes marques au tritium et les produits des reactions radiochimiques ont ete determines par voie de chromatographie gazeuse a l'aide de deux detecteurs montes en serie (un ' catharometre' et un compteur Geiger a balayage continu). Les auteurs montrent que dans l'ethylene irradie, la gamme des produits marques se distingue sensiblement de celle des produits non marques, Les principaux produits non marques sont; C{sub 2}H{sub 2}, C{sub 2}H{sub 6}, C{sub 4}H{sub 10} et des carbures a plus de quatre atomes d'hydrogene, le rendement en H2 etant faible. Les principaux produits marques sont; HT, C{sub 2}H{sub 3}T et C{sub 4}H{sub 9}T, le rendement en C{sub 2}H{sub 5}T et surtout en C{sub 2}HT etant negligeable. Le rendement en composes marques depend des substances ajoutees a l'ethylene (ammoniac, helium, iode), du compose contenant du lithium et de la structure de la cible. En ramenant la temperature de 50 Degree-Sign C to -78 Degree-Sign C, on ne modifie que faiblement la repartition des produits marques; cependant, lors du passage de l'ethylene a l'etat solide (-196 Degree-Sign C), on observe un effet de phase; la production de HT et C{sub 4}H{sub 9}T diminue, alors que l'activite de l'ethylene C{sub 2}H{sub 3}T augmente. Les auteurs montrent que lors de la radiolyse de C{sub 2}H{sub 4} et des melanges de ce carbure et d'ammoniac, le rapport C{sub 2}H{sub 6}/C{sub 4}H{sub 10} est egal a 1,0 {+-} 0,3, ce qui ne concorde pas avec le schema classique des reactions de dismutation et de recombinaison des radicaux ethyle thermiques (C{sub 2}H{sub 6}/C{sub 4}H{sub 10} = 0.2 {+-} 0.1). En se fondant sur les donnees relatives aux effets que les additions d'helium et la temperature exercent sur le rendement en C{sub 2}H{sub 6} et C{sub 4}H{sub 10} lors de la radiolyse de C{sub 2}H{sub 4} et de la photolyse des melanges C{sub 2}H{sub 4}-HI; les auteurs ont etabli une theorie expliquant l'apparition de radicaux d'ethyle excites C{sub 2}H*{sub 5} Ces derniers se forment lorsque des atomes chauds d'hydrogene (produits par la radiolyse ou la photolyse) se fixent sur l'ethylene suivant la formule: H* + C{sub 2}H{sub 4} = C{sub 2}H*{sub 5}. On montre que le radical C{sub 2}H*{sub 5} subit facilement la reaction C{sub 2}H*{sub 5} + RH = C{sub 2}H{sub 6} + R, ce qui explique pourquoi la radiolyse de l'ethylene donne lieu a la production d'un 'excedent' d'ethane. (author) [Spanish] Como resultado de las reacciones nucleares Li{sup 6}(n, {alpha})T y He{sup 3}(n, p)T se forman atomos calientes de tritio. La elevada actividad quimica de dichos atomos deteimina en gran parte las caracteristicas de los efectos quimicos de las transformaciones nucleares asociadas. Sin embargo, los atomos calientes de tritio pueden desempenar un papel esencial no solo en la quimica nuclear, sino tambien en otras esferas de la quimica de las altas energias: radiolisis, fotolisis, etc. En la presente memoria se compara el comportamiento de los atomos calientes de tritio, obtenidos de diversos modos: por la reaccion Li{sup 6} (n, {alpha})T (E = 2,7 MeV); por radiolisis (E Tilde-Operator algunos eV); por fotolisis (E Tilde-Operator 1 a 1,5 eV ; el hidrogeno caliente se obtiene a partir del HI por fotolisis, siendo {lambda} = 2 537 A). Como blancos para obtener atomos de tritio los autores utilizaron cristales y peliculas de Li{sub 2}Co{sub 3}, Li{sup 6}F, Li{sup 6}OH, Li{sup 6}BO{sub 2} * 8H{sub 2}. Irradiaron etileno gaseoso (P = 5 a 10 atm) y sus mezclas con amoniaco, helio e inhibidores. La irradiacion se efectuo en un reactor del tipo 1RT-1000, con un flujo de 10{sup 11} a 10{sup 12} neutrones termicos/cm{sup 2} * s. Los compuestos tritiados y los productos de las reacciones inducidas por radiaciones se determinaron por cromatografia de gases con ayuda de dos detectores montados en serie: un catarometro y un contador Geiger de corriente gaseosa. Los autores demuestran que el espectro de los productos marcados y sin marcar en el etileno irradiado presenta considerables diferencias. Los principales productos no marcados son el C{sub 2}H{sub 2}, C{sub 2}H{sub 6}, C{sub 4}H{sub 10} e hidrocarburos > C{sub 4}; el rendimiento de H{sub 2} es pequeno. Los principales productos marcados son el HT, C{sub 2}H{sub 3}T y C{sub 4}H{sub 9}T, el rendimiento de C{sub 2}H{sub 5}T y en especial de C{sub 2}HT es insignificante. Los rendimientos de los compuestos marcados dependen de la introduccion de aditivos (amoniaco, helio, yodo) en el etileno del tipo del compuesto que contiene litio y de la estructura del blanco. La disminucion de la temperatura desde 50 Degree-Sign C to -78 Degree-Sign C influye escasamente en la distribucion de los productos marcados; sin embargo, al pasar al etileno solido, a -196 Degree-Sign C, se observa un efecto de fases: disminuye el rendimiento de HT y de C{sub 4}H{sub 9}T y aumenta la actividad del compuesto original C{sub H3}T. Los autores demuestran que en la radiolisis del C{sub 2}H{sub 4} y de sus mezclas con amoniaco, la relacion C{sub 2}H{sub 6}/C{sub 4}H{sub 10} es igual a 1,0 {+-} 0,3, lo que no concuerda con el esquema clasico relativo a las reacciones de dismutacion y recombinacion termica de los radicales etileno (C{sub 2}H{sub 6}/C{sub 4}H{sub 10} = 0,2 {+-} 0,1). Basandose en los datos relativos a la influencia ejercida al anadir helio y al aumentar la temperatura sobre el rendimiento de C{sub 2}H{sub 6} y C{sub 4}H{sub 10} por radiolisis del C{sub 2}H{sub 4} y fotolisis de mezclas de C{sub 2}H{sub 4} -HI, los autores establecen una hipotesis sobre la formacion de radicales etilicos excitados (C{sub 2}H*{sub 5}). Estos ultimos se obtienen como resultado de la combinacion de atomos de hidrogeno calientes generados por radiolisis o por fotolisis, con el etileno: J* + C{sub 2}H{sub 4} = C{sub 2}H*{sub 5}. Demuestran que el radical C2Hf interviene facilmente en la reaccion C{sub 2}H*{sub 5} + RH = C{sub 2}H{sub 6} + R, que explica el 'exceso' de etano formado durante la radiolisis del etileno. (author) [Russian] Izvestno, chto v rezul'tate jadernyh reakcij Li{sup 6}(n, {alpha})T i He{sup 3}(n, p) T obrazujutsja gorjachie atomy radioaktivnogo vodoroda. Vysokaja himicheskaja aktivnost' takih atomov vo mnogom opredeljaet osobennosti himicheskih posledstvij jadernyh prevrashhenij. Odnako gorjachie atomy vodoroda mogut igrat' sushhestvennuju rol' ne tol'ko v jadernoj himii, no i v drugih oblastjah himii vysokih jenergij: pri radiolize, fotolize i t.d. V nastojashhej rabote sdelana popytka sopostavit' povedenie gorjachih atomov vodoroda, poluchaemyh razlichnym putem: pri reakcii i{sup 6}(n, {alpha})T (E{sub otd} = 2,7 Mjev), radioliticheski (E Tilde-Operator neskol'koojev), fotoliticheski (E Tilde-Operator 1 - 1,5 jev; gorjachij vodorod poluchaetsja iz HJ pri fotolize s {lambda}2537A). V kachestve mishenej dlja poluchenija atomov tritija ispol'zovalis' kristally i plenki Li{sub 2}Co{sub 3}, Li{sup 6}F, Li{sup 6}OH, Li{sup 6}BO{sub 2} * 8H{sub 2}. Oblucheniju podvergali gazoobraznyj jetilen (R = 5-10 atm.) i ego smesi s ammiakom, geliem i ingibitorami. Obluchenie provodilos' na rjoaktore tipa IRT-1000 pri potoke teplovyh nejtronov 10{sup 11} - 10{sup 12} n/cm{sup 2}sek. Mechennye po tritiju soedinenija i produkty radiacionno-himicheskih reakcij opredeljali gazohromatograficheski s pomoshh'ju dvuh posledovatel'no soedinennyh.datchikov (katarometr) i protochnyj schetchik Gejgera). Pokazano, chto spektr mechenyh i nemechenyh produktov v obluchaemom jetilene znachitel'no otlichaetsja. Osnovnymi nemechenymi produktami javljajutsja C{sub 2}H{sub 2}, C{sub 2}H{sub 6}, C{sub 4}H{sub 10} i uglevodorody >C{sub 4}; vyhod H{sub 2} mal. Osnovnymi nemechenymi produktami javljajutsja HT, C{sub 2}H{sub 3}T i. C{sub 4}H{sub 9}T, vyhod C{sub 2}H5T i osobenno C{sub 2}HT neznachitelen. Vyhody mechenyh soedinenij zavisjat ot vvedenija dobavok v jetilen (ammiak, gelij, jod), vida litijsoderzhashhego soedinenija, struktury misheni. Ponizhenie temperatury s 50 do -78 Degree-Sign malo vlijaet na raspredelenie mechenyh produktov, odnako, pri perehode k tverdomu jetilenu (-196 Degree-Sign C) nabljudaetsja fazovyj jeffekt: umen'shaetsja vyhod HT i C{sub 4}H{sub 9}T i uvelichivaetsja aktivnost' materinskogo soedinenija C{sub 2}H{sub 3}T. Pokazano, chto pri radiolize C{sub 9}H{sub 4} i ego smesej s ammiakom otnoshenie C{sub 2}H{sub 6}/C{sub 4}H{sub 10} ravno 1,0 {+-} 0,3, chto ne soglasuetsja s kanonicheskoj shemoj dlja reakcij disproporcionirovanija i rekombinacii teplovyh jetil'nyh radikalov (C{sub 2}H{sub 6}/C{sub 4}H{sub 10} = 0,2 {+-} 0,1). Na osnovanii dannyh po vlijaniju dobavok gelija i temperatury na vyhod C{sub 2}H{sub 6} i C{sub 4} Nju pri radiolize C{sub 2}H{sub 4} i pri fotolize smesej C{sub 2}H{sub 4} -HJ sformulirovano predstavlenie ob obrazovanii vozbuzhdennyh jetil'nyh radikalov C{sub 2}H{sub 5}*. Poslednie poluchajutsja za schet prisoedinenija gorjachih atomov vodoroda (generiruemyh radioliticheski ili fotoliticheski) k jetilenu: H* + C{sub 2}H{sub 4} = C{sub 2}H{sub 5}*. Pokazano, chto C{sub 2}H{sub 5}*-radikal legko vstupaet v reakciju otryva C{sub 2}H*{sub 5} + RH = C{sub 2}H{sub 6} + R, chto ob'jasnjaet ''izbytochnoe'' kolichestvo jetana, obrazujushhegosja pri radiolize jetilena. (author)

  5. Radiation Polymerization in the Solid Phase; Polymerisation radiochimique en phase solide; Radiatsionnaya polimerizatsiya v tverdoj faze; Radiopolimerizacion en fase solida

    Energy Technology Data Exchange (ETDEWEB)

    Barkalov, I. M.; Gol' danskij, V. I.; Enikolopov, N. S.; Terekhova, S. F.; Trofimova, G. M.


    EHPR pokazalo, chto spetsificheskaya radiatsionnaya reaktsiya v khode oblucheniya igraet sushchestvennuyu rol'. Posle okonchaniya oblucheniya protsessa polimerizatsii akrilonitrila (ot -196{sup o} do -140{sup o}C) i vinilatsetata (ot -196{sup o} do -100{sup o}C) prekrashchaetsya nesmotrya kak na sokhranenie formy i intensivnosti signala EHPR, tak i na bol'shoe vremya zhizni sozdavaemykh oblucheniem ionov. Rezul'taty ehtikh opytov svidetel'stvuyut o vozmozhnoj bol'shoj roli korotkozhivushchikh vozbuzhdennykh sostoyanij v radiatsionnoj tverdofaznoj polimerizatsii ryada monomerov. Takaya polimerizatsiya ''pod puchkom'' proiskhodit prakticheski bez ehnergii aktivatsii - v otlichie ot medlennoj postpolimerizatsii, idushchej s toj zhe ehnergiej aktivatsii, chto i zhidkofaznyj protsess. (author)

  6. Recent Developments in the Theory of Mechanisms in Radiation Chemical Processes; Developpements recents dans la theorie des mecanismes des reactions radiochimiques; Poslednie dostizheniya v teorii mekhanizmov radiatsionno-khimicheski kh protsessov; Adelantos recientes en la interpretacion teorica del mecanismo de los procesos radioquimicos

    Energy Technology Data Exchange (ETDEWEB)

    Roberts, R. [U.K.A.E.A., Wantage Research Laboratory, Berks (United Kingdom)


    importancia de los procesos ion-molecula, atendiendo particularmente a la radioquimica del metano. Deduce que se verifican en este sistema reacciones de moleculas excitadas, ademas de los procesos ionicos. Demuestra que los hidrocarburos no saturados desempenan un papel destacado en la radiolisis del metano. Pasa revista a los perfeccionamientos de la polimerizacion ionica, asi como de la polimerizacion en condiciones heterogeneas. Se refiere a la importancia de la pureza de los reactivos y a la limpieza de los recipientes. Examina brevemente el efecto de la aplicacion de un potencial extemo en la polimerizacion en fase solida. Senala la importancia radioquimica de los procesos basados en radicales libres, en relacion con el proceso Dow para la produccion del bromuro de etilo. (author) [Russian] Rassmatrivayutsya poslednie dostizheniya v teorii mekhanizmov khimicheskikh reaktsij, initsiirovannykh oblucheniem. Rassmatrivaetsya rol' iono-yolekulyarnykh protsessov, pri ehtom obrashchaetsya osoboe vnimanie na radiatsionnukh khimiyu metana. Sdelan vyvod, chto v ehtoj sisteme naryadu s ionnymi protsessami proiskhodyat reaktsii vozbuzhdennykh molekul. Pokazano, chto pri radiolize metana nenasyshchennye uglevodorody igravt znachitel'nuyu rol' v mekhanizme reaktsii. Rassmatrivayutsya dostizheniya v oblasti ionnoj polimerizatsii i polimerizatsii pri geterogennykh usloviyakh. Obsuzhdaetsya znachenie stepeni ochistki reagenta i chistoty reaktsionnogo sosuda. Kratko rassmatrivaetsya vozdejstvie prilozhennogo vneshnego potentsiala na polimerizatsiyu tverdykh tel. Znachenie protsessov svobodnykh radikalov v radiatsionnoj khimii rassmatrivaetsya v svete protsessa Dou dlya proizvodstva bromistogo ehtila. (author)

  7. High thermoelectric figure of merit in nanocrystalline polyaniline at low temperatures

    Energy Technology Data Exchange (ETDEWEB)

    Nath, Chandrani; Kumar, Ashok, E-mail:, E-mail: [Materials Research Laboratory, Department of Physics, Tezpur University, Tezpur 784 028 (India); Kuo, Yung-Kang [Department of Physics, National Dong-Hwa University, Hualien 974, Taiwan (China); Okram, Gunadhor Singh, E-mail:, E-mail: [Electrical Transport Laboratory, UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452 017 (India)


    Thermoelectric coolers with figure of merit (ZT) close to unity at low temperatures are the need of the hour with new advances in high temperature superconductors, superconducting microelectronic circuits, quantum computers, and photonics. Here, we demonstrate that the conducting polymer polyaniline (Pani) doped with camphor sulfonic acid synthesized in semi-crystalline nanostructures, possesses a giant Seebeck effect at low temperatures. The resulting enormously large Seebeck coefficient (up to 0.6 V/K) combined with an intrinsically low electrical conductivity and thermal conductivity give rise to a ZT = 0.77 at 45 K and ZT = 2.17 at 17 K.

  8. Resonance absorption of nuclear gamma radiation; Absorption par resonance des rayons gamma; Rezonansnaya absorbtsiya i rasseyanie yadernogo gamma-izlucheniya; Absorcion por resonancia de las radiaciones gamma en los nucleos

    Energy Technology Data Exchange (ETDEWEB)

    Hanna, S S; Perlow, G J [Argonne National Laboratory, Argonne, IL (United States)


    radiacion do resonancia con y sin polarizacion. Estos estudios les han conducido a una interpretacion de la estructura hiperfina en funcion de las propiedades de los estados nucleares y de la interaccion hiperfina en el hierro. Tambien han investigado los efectos de un campo magnetico externo sobre la estructura hiperfina. Por otra parte, la absorcion por resonancia en el {sup 57}Fe permitio estudiar la relacion entre la cronologia de la desintegracion de im estado nuclear y el espectro de la radiacion observada. Se realizaron observaciones detalladas sobre el espectro de las radiaciones de resonancia filtradas, en funcion del tiempo, en condiciones muy diversas. (author) [Russian] Kak pokazal Messbauehr, ispuskanie i pogloshchenie yadernogo izlucheniya bez otdachi yadra obespechivaet prostoj metod izucheniya vzaimodejstviya yader s ehlektromagnitnym izlucheniem i, chto ochen' vazhno, yavlyaetsya chrezvychajno chuvstvitel'nym sredstvom issledovaniya bol'shogo kolichestva fizicheskikh zadach. V sluchae yader zheleza-57 sozdaetsya ves'ma blagopriyatnoe polozhenie, tak kak v ehtom sluchae rezonansnoe pogloshchenie mozhet ispol'zovat'sya v kachestve ochen' chuvstvitel'nogo detektora izmeneniya chastoty ehlektromagnitnogo izlucheniya. Detal'no izuchalos' rezonansnoe pogloshchenie v zheleze-57. Intensivnost' pogloshcheniya, forma i liniya sdviga nablyudalis' v zavisimosti ot temperatury. Polyarizatsiya radioaktivnogo izlucheniya nablyudalas' posredstvom ehksperimentov s namagnichennymi istochnikami i poglotitelyami. Sverkhtonkij spektr rezonansnoj radiatsii analizirovalsya s polyarizatsiej i bez nee. EHti issledovaniya priveli k tolkovaniyu sverkhtonkoj struktury v otnoshenii svojstv yadernykh sostoyanij i sverkhtonkogo vzaimodejstviya v zheleze. Bylo rassmotreno takzhe vliyanie vneshnego magnitnogo polya na sverkhtonkuyu strukturu. Rezonansnoe pogloshchenie v zheleze-57 bylo ispol'zovano dlya izucheniya svyazi mezhdu razvitiem raspada yadernogo sostoyaniya vo vremeni i spektrom

  9. Beta-Excited Sources of Electromagnetic Radiation; Sources de rayonnements electromagnetiques excites par des particules beta; Vozbuzhdennye beta-chastitsami istochniki ehlektromagnitnogo izlucheniya; Fuentes de radiacion electromagnetica excitadas por particulas beta

    Energy Technology Data Exchange (ETDEWEB)

    Cameron, J F; Rhodes, J R [Physics Group, Isotope Research Division, (AERE), Wantage Research Laboratory, Wantage, Berks (United Kingdom)


    incluyen cuadros que permiten escoger la fuente optima para absorbentes de distintos espesores. (author) [Russian] Avtory dayut opisanie vozbuzhdennykh beta-chastitsami istochnikov ehlektromagnitnogo izlucheniya v ehnergeticheskom rajone ot 1 do 200 kehv i prigodnykh dlya promyshlennogo ispol'zovaniya. V kachestve istochnikov beta-chastits byli vzyaty tritij, prometij-147, kripton-85, tallij-204 i strontsij-90+ ittrij-90, poskol'ku oni imeyut prodolzhitel'nyj period poluraspada, nebol'shuyu stoimost', vysokuyu udel'nuyu aktivnost' i legkost' ikh polucheniya. Dlya izgotovleniya vozbuzhdennykh beta-chastitsami istochnikov staralis' dostignut' kompromissa mezhdu prakticheskimi trebovaniyami konstruktsii i nailuchshej teoreticheskoj ehffektivnost'yu v dannoj ehnergeticheskoj zone. V dannoj annotatsii avtory raz{sup y}asnyayut putem podscheta kolichestva protonov, izluchaemykh beta-chastitsami, i predusmatrivayut vnesenie izmenenij v ehti podschety dlya samoabsorbtsii rentgenovskogo izlucheniya. EHti podschety uchityvayut v to zhe samoe vremya tormoznoe izluchenie i kharakteristicheskie flyuorestsentnye luchi, maksimal'nyj vykhod kharakteristicheskikh luchej, dostigaemyj dlya mishenej Z ot 40 do 60. Nakonets, oni utverzhdayut, chto v zhelaemoj ehnergeticheskoj zone poluchayut kak luchshij vykhod fotonnogo izlucheniya so ''sloenymi'' mishenyami, sloj polovinnogo oslableniya kotorogo sootvetstvuet dline probega 1-2 beta. Alyuminij, serebro i zoloto s proizvodstvennoj tochki zreniya yavlyayutsya podkhodyashchimi ehlementami dlya pokrytiya istochnikov. Oni takzhe dayut udovletvoritel'nye vykhody tormoznogo izlucheniya i rentgenovskogo izlucheniya i raspredelenie po razlichnym ehnergeticheskim zonam v radiuse ot 0 do 200 kehv pri pravil'nom ob{sup e}dinenii s vysheukazannymi beta-izluchatelyami. Dayutsya nekotorye ehnergeticheskie spektry i privodyatsya krivye pogloshcheniya v alyuminii i zheleze dlya nailuchshikh kombinatsij istochnikov mishenej. Byla obnaruzhena neznachitel

  10. Learning cardiopulmonary resuscitation theory with face-to-face versus audiovisual instruction for secondary school students: a randomized controlled trial. (United States)

    Cerezo Espinosa, Cristina; Nieto Caballero, Sergio; Juguera Rodríguez, Laura; Castejón-Mochón, José Francisco; Segura Melgarejo, Francisca; Sánchez Martínez, Carmen María; López López, Carmen Amalia; Pardo Ríos, Manuel


    To compare secondary students' learning of basic life support (BLS) theory and the use of an automatic external defibrillator (AED) through face-to-face classroom instruction versus educational video instruction. A total of 2225 secondary students from 15 schools were randomly assigned to one of the following 5 instructional groups: 1) face-to-face instruction with no audiovisual support, 2) face-to-face instruction with audiovisual support, 3) audiovisual instruction without face-to-face instruction, 4) audiovisual instruction with face-to-face instruction, and 5) a control group that received no instruction. The students took a test of BLS and AED theory before instruction, immediately after instruction, and 2 months later. The median (interquartile range) scores overall were 2.33 (2.17) at baseline, 5.33 (4.66) immediately after instruction (Paudiovisual instruction for learning BLS and AED theory were found in secondary school students either immediately after instruction or 2 months later.

  11. Research Applications of Beta-Particle Techniques: Back-Scattering and X-Ray Excitation; Applications de l'irradiation beta dans la recherche: retrodiffusion et excitation de rayons X; Primenenie metodov beta-chastits v issledovatel'skoj rabote: obratnoe rasseyanie i vozbuzhdenie rentgenovskikh luchej; Aplicacion de la irradiacion beta en la investigacion: retrodispersion y excitacion de rayos X

    Energy Technology Data Exchange (ETDEWEB)

    Mueller, R H [Los Alamos Scientific Laboratory, University of California, Los Alamos, NM (United States)


    tecnicas confirman la opinion de que los radioisotopos encierran enormes promesas en el terreno cientifico y tecnico. Por lo que se refiere a las fuentes de rayos X, puede decirse que todo cuanto se realiza en el terreno de la tecnologia de los rayos X, salvo la determinacion de la estructura de los cristales, puede hacerse con mayor sencillez recurriendo a los medios citados. Es mas, si se emplearan fuentes de muchos curies, puede que incluso llegue a ser posible efectuar esas determinaciones. (author) [Russian] Prozvedennye v ehtoj laboratorii za poslednie sem', let issledovaniya ustanovili tochnye usloviya obratnogo rasseyaniya beta-chastits, i ehti metody byli dopolneny metodami ispol'zovaniya vozbuzhdennykh izotopami rentgenovskikh luchej. Vozbuzhdennye takim sposobom rentgenovskie luchi privlekli .shirokoe vnimanie vo vsem svete i vo mnogikh sluchayakh oni revolyutsionizirovali metody promyshlennoj kalibrovki. V nastoyashchem doklade razbirayutsya primeneniya k tochnoj abzorbtsiometrii, izmereniyu tolshchiny plenok, opoznovaniyu i kolichestvennomu opredeleniyu veshchestv putem izmereniya absorbtsii po krayam, a takzhe k bumazhnoj khromatografii. V poslednem sluchae, khromato grammy mogut izuchat'sya posredstvom beta-absorbtsii, absorbtsii rentgenovskimi luchami ili vozbuzhdeniem rentgenovskikh luchej v razlichnykh zonakh bombardirovkoj beta-luchami. Sravnivayutsya i otsenivayutsya ehti razlichnye podkhody. Byl izuchen tselyj ryad mikrokhimicheskikh metodov i libo posredstvom beta-absorbtsii, libo posredstvom vozbuzhdeniya rentgenovskikh luchej beta-chastitsami mogut byt' opoznany i opredeleny nebol'shie kolichestva veshchestv. Nizshie predely detektsii ne tak:maly, kak ehto dostizhimo metodom radioaktivnykh indikatorov, no imeetsya ryad drugikh preimushchestv, glavnoe iz kotorykh zaklyuchaetsya v tom, chto operatsii proizvodyatsya s zadelannymi istochnikami, chto pochti sovershenno isklyuchaet vozmozhnost' radioaktivnogo zarazheniya. Na osnovanii ehtikh dannykh byli

  12. Digital Breast Tomosynthesis versus Supplemental Diagnostic Mammographic Views for Evaluation of Noncalcified Breast Lesions (United States)

    Bandos, Andriy I.; Ganott, Marie A.; Sumkin, Jules H.; Kelly, Amy E.; Catullo, Victor J.; Rathfon, Grace Y.; Lu, Amy H.; Gur, David


    Purpose: To compare the diagnostic performance of breast tomosynthesis versus supplemental mammography views in classification of masses, distortions, and asymmetries. Materials and Methods: Eight radiologists who specialized in breast imaging retrospectively reviewed 217 consecutively accrued lesions by using protocols that were HIPAA compliant and institutional review board approved in 182 patients aged 31–60 years (mean, 50 years) who underwent diagnostic mammography and tomosynthesis. The lesions in the cohort included 33% (72 of 217) cancers and 67% (145 of 217) benign lesions. Eighty-four percent (182 of 217) of the lesions were masses, 11% (25 of 217) were asymmetries, and 5% (10 of 217) were distortions that were initially detected at clinical examination in 8% (17 of 217), at mammography in 80% (173 of 217), at ultrasonography (US) in 11% (25 of 217), or at magnetic resonance imaging in 1% (2 of 217). Histopathologic examination established truth in 191 lesions, US revealed a cyst in 12 lesions, and 14 lesions had a normal follow-up. Each lesion was interpreted once with tomosynthesis and once with supplemental mammographic views; both modes included the mediolateral oblique and craniocaudal views in a fully crossed and balanced design by using a five-category Breast Imaging Reporting and Data System (BI-RADS) assessment and a probability-of-malignancy score. Differences between modes were analyzed with a generalized linear mixed model for BI-RADS–based sensitivity and specificity and with modified Obuchowski-Rockette approach for probability-of-malignancy–based area under the receiver operating characteristic (ROC) curve. Results: Average probability-of-malignancy–based area under the ROC curve was 0.87 for tomosynthesis versus 0.83 for supplemental views (P tomosynthesis, the false-positive rate decreased from 85% (989 of 1160) to 74% (864 of 1160) (P tomosynthesis, more cancers were classified as BI-RADS category 5 (39% [226 of 576] vs 33% [188

  13. Analyses of antibacterial activity and cell compatibility of titanium coated with a Zr-C-N film.

    Directory of Open Access Journals (Sweden)

    Yin-Yu Chang

    Full Text Available The purpose of this study was to verify the antibacterial performance and cell proliferation activity of zirconium (Zr-carbon (C-nitride (N coatings on commercially pure titanium (Ti with different C contents.Reactive nitrogen gas (N(2 with and without acetylene (C(2H(2 was activated by Zr plasma in a cathodic-arc evaporation system to deposit either a zirconium nitride (ZrN or a Zr-C-N coating onto Ti plates. The bacterial activity of the coatings was evaluated against Staphylococcus aureus with the aid of SYTO9 nucleic acid staining and scanning electron microscopy (SEM. Cell compatibility, mRNA expression, and morphology related to human gingival fibroblasts (HGFs on the coated samples were also determined by using the MTT assay, reverse transcriptase-polymerase chain reaction, and SEM.The Zr-C-N coating with the highest C content (21.7 at% exhibited the lowest bacterial preservation (P<0.001. Biological responses including proliferation, gene expression, and attachment of HGF cells to ZrN and Zr-C-N coatings were comparable to those of the uncoated Ti plate.High-C-content Zr-C-N coatings not only provide short-term antibacterial activity against S. aureus but are also biocompatible with HGF cells.

  14. Simultaneous determination of radionuclides separable into natural decay series by use of time-interval analysis

    International Nuclear Information System (INIS)

    Hashimoto, Tetsuo; Sanada, Yukihisa; Uezu, Yasuhiro


    A delayed coincidence method, time-interval analysis (TIA), has been applied to successive α-α decay events on the millisecond time-scale. Such decay events are part of the 220 Rn→ 216 Po (T 1/2 145 ms) (Th-series) and 219 Rn→ 215 Po (T 1/2 1.78 ms) (Ac-series). By using TIA in addition to measurement of 226 Ra (U-series) from α-spectrometry by liquid scintillation counting (LSC), two natural decay series could be identified and separated. The TIA detection efficiency was improved by using the pulse-shape discrimination technique (PSD) to reject β-pulses, by solvent extraction of Ra combined with simple chemical separation, and by purging the scintillation solution with dry N 2 gas. The U- and Th-series together with the Ac-series were determined, respectively, from alpha spectra and TIA carried out immediately after Ra-extraction. Using the 221 Fr→ 217 At (T 1/2 32.3 ms) decay process as a tracer, overall yields were estimated from application of TIA to the 225 Ra (Np-decay series) at the time of maximum growth. The present method has proven useful for simultaneous determination of three radioactive decay series in environmental samples. (orig.)

  15. Radioisotope space power generator annual report, July 1, 1974--June 30, 1975

    International Nuclear Information System (INIS)

    Elsner, N.B.; Chin, J.; Staley, H.G.


    The Isotec Technology Program for FY-75 concentrated on materials development efforts in two areas: TPM-217 P-type material and SiGe technology. TPM-217 P-type material is a 3M proprietary thermoelectric material whose principal components are Cu, Ag, and Se. The usefulness of TPM-217 P-type selenide in thermoelectric converters depends on its dimensional, electrical, and thermal stability at high temperature and its compatibility with other converter component materials in a low-pressure environment. Experimental efforts were directed toward determining (1) the vapor species above TPM-217 from 700 0 to 1100 0 C, (2) the weight loss rate for TPM-217 at 900 0 C in vacuo, and (3) the stability of TPM-217 material in contact with Mo, Fe, 316 stainless steel, and pyrocarbon. The Si-Ge program is a continuation of the experimental work performed during FY-74. The development of coatings to suppress the vaporization of SiMo and SiGe continued. Techniques for applying ion-plated and chemical-vapor-deposited coatings of Si 3 N 4 and (Si,Al)N alloys on SiMo were examined. Methods of controlling morphology and the chemical composition of these coatings were developed. Rates of vaporization for coated samples at 1100 0 C were measured

  16. Some properties of low-vapor-pressure braze alloys for thermionic converters (United States)

    Bair, V. L.


    Density, dc electrical resistivity, thermal conductivity, and linear thermal expansion are measured for arc-melted rod-shaped samples of binary eutectics of Zr, Hf, Ru, Nb, Ir, Mo, Ta, Os, Re, and W selected as very-low-pressure braze fillers for thermionic converters. The first two properties are measured at 296 K for Zr-21.7 at% Ru, Zr-13 wt% W, Zr-19 wt% W, Zr-22.3 at% Nb, Nb-66.9 at% Ru, Hf-25.3 wt% Re, Zr-25.7 at% Ta, Hf-22.5 at% W, and Nb-35 wt% Mo. The last property is measured from 293 K to 2/3 melting point for specified alloys of different compositions. Resistivities of 0.000055 to 0.000181 ohm-cm are observed with the alloys having resistivities about ten times that of the less resistive constituent metal and about three times that of the more resistive constituent metal, except for Zr-19 wt% W and Nb-35 wt% Mo (greater resistivities). Thermal expansion coefficients vary from 0.000006 to 0.0000105/K. All brazes exhibit linear thermal expansion near that of their constituent metals.

  17. Optimal thermionic energy conversion with established electrodes for high-temperature topping and process heating. [coal combustion product environments (United States)

    Morris, J. F.


    Applied research-and-technology (ART) work reveals that optimal thermionic energy conversion (TEC) with approximately 1000 K to approximately 1100 K collectors is possible using well established tungsten electrodes. Such TEC with 1800 K emitters could approach 26.6% efficiency at 27.4 W/sq cm with approximately 1000 K collectors and 21.7% at 22.6 W/sq cm with approximately 1100 K collectors. These performances require 1.5 and 1.7 eV collector work functions (not the 1 eV ultimate) with nearly negligible interelectrode losses. Such collectors correspond to tungsten electrode systems in approximately 0.9 to approximately 6 torr cesium pressures with 1600 K to 1900 K emitters. Because higher heat-rejection temperatures for TEC allow greater collector work functions, interelectrode loss reduction becomes an increasingly important target for applications aimed at elevated temperatures. Studies of intragap modifications and new electrodes that will allow better electron emission and collection with lower cesium pressures are among the TEC-ART approaches to reduced interelectrode losses. These solutions will provide very effective TEC to serve directly in coal-combustion products for high-temperature topping and process heating. In turn this will help to use coal and to use it well.

  18. Clinical and structural remission rates increased annually and radiographic progression was continuously inhibited during a 3-year administration of tocilizumab in patients with rheumatoid arthritis: A multi-center, prospective cohort study by the Michinoku Tocilizumab Study Group. (United States)

    Hirabayashi, Yasuhiko; Munakata, Yasuhiko; Miyata, Masayuki; Urata, Yukitomo; Saito, Koichi; Okuno, Hiroshi; Yoshida, Masaaki; Kodera, Takao; Watanabe, Ryu; Miyamoto, Seiya; Ishii, Tomonori; Nakazawa, Shigeshi; Takemori, Hiromitsu; Ando, Takanobu; Kanno, Takashi; Komagamine, Masataka; Kato, Ichiro; Takahashi, Yuichi; Komatsuda, Atsushi; Endo, Kojiro; Murai, Chihiro; Takakubo, Yuya; Miura, Takao; Sato, Yukio; Ichikawa, Kazunobu; Konta, Tsuneo; Chiba, Noriyuki; Muryoi, Tai; Kobayashi, Hiroko; Fujii, Hiroshi; Sekiguchi, Yukio; Hatakeyama, Akira; Ogura, Ken; Sakuraba, Hirotake; Asano, Tomoyuki; Kanazawa, Hiroshi; Suzuki, Eiji; Takasaki, Satoshi; Asakura, Kenichi; Sugisaki, Kota; Suzuki, Yoko; Takagi, Michiaki; Nakayama, Takahiro; Watanabe, Hiroshi; Miura, Keiki; Mori, Yu


    To evaluate the clinical and structural efficacy of tocilizumab (TCZ) during its long-term administration in patients with rheumatoid arthritis (RA). In total, 693 patients with RA who started TCZ therapy were followed for 3 years. Clinical efficacy was evaluated by DAS28-ESR and Boolean remission rates in 544 patients. Joint damage was assessed by calculating the modified total Sharp score (mTSS) in 50 patients. When the reason for discontinuation was limited to inadequate response or adverse events, the 1-, 2-, and 3-year continuation rates were 84.0%, 76.8%, and 72.2%, respectively. The mean DAS28-ESR was initially 5.1 and decreased to 2.5 at 6 months and to 2.2 at 36 months. The Boolean remission rate was initially 0.9% and increased to 21.7% at 6 months and to 32.2% at 36 months. The structural remission rates (ΔmTSS/year ≤ 0.5) were 68.8%, 78.6%, and 88.9% within the first, second, and third years, respectively. The structural remission rate at 3 years (ΔmTSS ≤ 1.5) was 66.0%, and earlier achievement of swollen joint count (SJC) of 1 or less resulted in better outcomes. TCZ was highly efficacious, and bone destruction was strongly prevented. SJC was an easy-to-use indicator of joint destruction.

  19. Orthodontic treatment need of 9, 12 and 15 year-old children according to the Index of Orthodontic Treatment Need and the Dental Aesthetic Index. (United States)

    Boronat-Catalá, Montserrat; Bellot-Arcís, Carlos; Montiel-Company, José María; Catalá-Pizarro, Montserrat; Almerich-Silla, José Manuel


    To assess the differences in occlusal features in three cohorts at 9, 12 and 15 years of age, and compare orthodontic treatment need measured by the Dental Aesthetic Index (DAI) and Index of Orthodontic Treatment Need (IOTN). Cross-sectional study. School of Dentistry, University of Valencia. A total of 1086 children: 321 aged 9, 397 aged 12 and 368 aged 15. Children were examined to measure their orthodontic treatment need according to IOTN and DAI. The main outcome measure was orthodontic treatment need according to the DAI and IOTN indices. Overbite and inter-incisal diastema were the occlusal features that presented significant differences between the three groups, diminishing with age. Treatment need according to the IOTN was 15.4% at 9 years, 20.9% at 12 years and 12.8% at 15 years. Treatment need according to DAI was 44.8% at 9 years, 21.7% at 12 years and 14.1% at 15 years. The diagnostic agreement between the two indices on the treatment need by age group was very low at 9 years (Kappa 0.18) and moderate at 12 and 15 years (Kappa 0.451 and 0.405, respectively). Orthodontic treatment need is greater in the mixed dentition and falls slightly as the child grows. The greatest variation in results between 9 and 15 years were found in relation to the DAI, which is consequently not recommended for use in the mixed dentition.

  20. The stability of DOTA-chelated radiopharmaceuticals within 225Ac decay pathway studied with density functional theory. (United States)

    Karolak, Aleksandra; Khabibullin, Artem; Budzevich, Mikalai; Martinez, M.; Doliganski, Michael; McLaughlin, Mark; Woods, Lilia; Morse, David

    Ligand structures encapsulating metal ions play a central role as contrast agents in Magnetic Resonance Imaging (MRI) or as agents delivering toxic cargo directly to tumor cells in targeted cancer therapy. The structural stability and interaction with solutions of such complexes are the key elements in understanding the foundation of delivery process. We present a comparative study for the 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) chelated to radioactive isotopes of 225Ac, 221Fr, 217At, 213Bi and a control 68Gd. Using density functional theory methods we investigate the structural stability of complexes for cancer therapy including binding energies, charge transfer, electron densities. The van der Waals interactions are included in the simulations to take into account weak dispersion forces present in such structures. Our results reveal that Ac-DOTA, Bi-DOTA and Gd-DOTA are the most stable complexes in the group. We also show that the water environment is a key ingredient for the structural coordination of the DOTA structures. Support from the US Department of Energy under Grant No. DE-FG02-06ER46297 is acknowledged.

  1. Edge effects enhance selfing and seed harvesting efforts in the insect-pollinated Neotropical tree Copaifera langsdorffii (Fabaceae). (United States)

    Tarazi, R; Sebbenn, A M; Kageyama, P Y; Vencovsky, R


    Edge effects may affect the mating system of tropical tree species and reduce the genetic diversity and variance effective size of collected seeds at the boundaries of forest fragments because of a reduction in the density of reproductive trees, neighbour size and changes in the behaviour of pollinators. Here, edge effects on the genetic diversity, mating system and pollen pool of the insect-pollinated Neotropical tree Copaifera langsdorffii were investigated using eight microsatellite loci. Open-pollinated seeds were collected from 17 seed trees within continuous savannah woodland (SW) and were compared with seeds from 11 seed trees at the edge of the savannah remnant. Seeds collected from the SW had significantly higher heterozygosity levels (Ho=0.780; He=0.831) than seeds from the edge (Ho=0.702; He=0.800). The multilocus outcrossing rate was significantly higher in the SW (tm=0.859) than in the edge (tm=0.759). Pollen pool differentiation was significant, however, it did not differ between the SW (=0.105) and the edge (=0.135). The variance effective size within the progenies was significantly higher in the SW (Ne=2.65) than at the edge (Ne=2.30). The number of seed trees to retain the reference variance effective size of 500 was 189 at the SW and 217 at the edge. Therefore, it is preferable that seed harvesting for conservation and environmental restoration strategies be conducted in the SW, where genetic diversity and variance effective size within progenies are higher.

  2. Cross-sectional survey of treatment practices for urethritis at pharmacies, private clinics and government health facilities in coastal Kenya: many missed opportunities for HIV prevention. (United States)

    Mugo, Peter M; Duncan, Sarah; Mwaniki, Samuel W; Thiong'o, Alexander N; Gichuru, Evanson; Okuku, Haile Selassie; van der Elst, Elise M; Smith, Adrian D; Graham, Susan M; Sanders, Eduard J


    While bacterial sexually transmitted infections (STIs) are important cofactors for HIV transmission, STI control has received little attention in recent years. The aim of this study was to assess STI treatment and HIV testing referral practices among health providers in Kenya. In 2011 we assessed quality of case management for male urethritis at pharmacies, private clinics and government health facilities in coastal Kenya using simulated visits at pharmacies and interviews at pharmacies and health facilities. Quality was assessed using Ministry of Health guidelines. Twenty (77%) of 26 pharmacies, 20 (91%) of 22 private clinics and all four government facilities in the study area took part. The median (IQR) number of adult urethritis cases per week was 5 (2-10) at pharmacies, 3 (1-3) at private clinics and 5 (2-17) at government facilities. During simulated visits, 10% of pharmacies prescribed recommended antibiotics at recommended dosages and durations and, during interviews, 28% of pharmacies and 27% of health facilities prescribed recommended antibiotics at recommended dosages and durations. Most regimens were quinolone-based. HIV testing was recommended during 10% of simulated visits, 20% of pharmacy interviews and 25% of health facility interviews. In an area of high STI burden, most men with urethritis seek care at pharmacies and private clinics. Most providers do not comply with national guidelines and very few recommend HIV testing. In order to reduce the STI burden and mitigate HIV transmission, there is an urgent need for innovative dissemination of up-to-date guidelines and inclusion of all health providers in HIV/STI programmes.

  3. [Spectral analysis of polyphenol oxidase (PPO) and lipoxygenase (LOX) treated by pulsed electric field]. (United States)

    Luo, Wei; Zhang, Ruo-Bing; Chen, Jie; Wang, Li-Ming; Guan, Zhi-Cheng; Jia, Zhi-Dong


    Inactivation effect of pulsed electric field (PEF) on polyphenol oxidase (PPO) and lipoxygenase (LOX) was investigated using a laboratory PEF system with a coaxial treatment chamber. Circular dichroism (CD) and fluorescence analysis were used to study the conformation change of the protein. The experimental results show that PPO and LOX can be effectively inactivated by the PEF treatment. Inactivation effect of PPO and LOX increases with the increase in the applied electric strength and the treatment time. Activity of PPO and LOX can be reduced by 60.3% and 21.7% at 20 kV x cm(-1) after being treated for 320 micros respectively. The decrease of the negative peaks (208 and 215 nm in PPO spectra, 208 nm and 218 nm in LOX spectra) in CD spectra of PPO and LOX shows that PEF treatment caused a loss of alpha-helix and increase in beta-sheet content, indicating that conformation changes occur in the secondary structure of PPO and LOX enzyme. This effect was strengthened as the applied electric field increased: alpha-helical content of PPO and LOX was 56% and 29% after being treated at 8 kV x cm(-1), however, when the electric field was increased up to 20 kV x cm(-1), alpha-helical content of PPO and LOX decreased to 21% and 16% respectively. The decrease rate of alpha-helix and increase rate of beta-sheet in PPO are higher than LOX, indicating that the second conformation of PPO is less resistant to PEF treatment than LOX. The fluorescence intensity of LOX increases after PEF treatment. At the same time, increasing the applied pulsed electric field increases the fluorescence intensity emitted. Fluorescence measurements confirm that tertiary conformation changes occur in the local structure of LOX. However the possible mechanism of the conformation change induced by the PEF treatment is beyond the scope of the present investigation.

  4. Enzyme architecture: deconstruction of the enzyme-activating phosphodianion interactions of orotidine 5'-monophosphate decarboxylase. (United States)

    Goldman, Lawrence M; Amyes, Tina L; Goryanova, Bogdana; Gerlt, John A; Richard, John P


    The mechanism for activation of orotidine 5'-monophosphate decarboxylase (OMPDC) by interactions of side chains from Gln215 and Try217 at a gripper loop and R235, adjacent to this loop, with the phosphodianion of OMP was probed by determining the kinetic parameters k(cat) and K(m) for all combinations of single, double, and triple Q215A, Y217F, and R235A mutations. The 12 kcal/mol intrinsic binding energy of the phosphodianion is shown to be equal to the sum of the binding energies of the side chains of R235 (6 kcal/mol), Q215 (2 kcal/mol), Y217 (2 kcal/mol), and hydrogen bonds to the G234 and R235 backbone amides (2 kcal/mol). Analysis of a triple mutant cube shows small (ca. 1 kcal/mol) interactions between phosphodianion gripper side chains, which are consistent with steric crowding of the side chains around the phosphodianion at wild-type OMPDC. These mutations result in the same change in the activation barrier to the OMPDC-catalyzed reactions of the whole substrate OMP and the substrate pieces (1-β-D-erythrofuranosyl)orotic acid (EO) and phosphite dianion. This shows that the transition states for these reactions are stabilized by similar interactions with the protein catalyst. The 12 kcal/mol intrinsic phosphodianion binding energy of OMP is divided between the 8 kcal/mol of binding energy, which is utilized to drive a thermodynamically unfavorable conformational change of the free enzyme, resulting in an increase in (k(cat))(obs) for OMPDC-catalyzed decarboxylation of OMP, and the 4 kcal/mol of binding energy, which is utilized to stabilize the Michaelis complex, resulting in a decrease in (K(m))(obs).


    International Nuclear Information System (INIS)

    Damen, M.; Franx, M.; Taylor, E. N.; Labbe, I.; Van Dokkum, P. G.; Muzzin, A.; Brandt, W. N.; Dickinson, M.; Gawiser, E.; Illingworth, G. D.; Kriek, M.; Marchesini, D.; Papovich, C.; Rix, H.-W.


    We present the Spitzer IRAC/MUSYC Public Legacy Survey in the Extended CDF-South (SIMPLE), which consists of deep IRAC observations covering the ∼1600 arcmin 2 area surrounding GOODS-S. The limiting magnitudes of the SIMPLE IRAC mosaics typically are 23.8, 23.6, 21.9, and 21.7, at 3.6 μm, 4.5 μm, 5.8 μm, and 8.0 μm, respectively (5σ total point source magnitudes in AB). The SIMPLE IRAC images are combined with the 10' x 15' GOODS IRAC mosaics in the center. We give detailed descriptions of the observations, data reduction, and properties of the final images, as well as the detection and photometry methods used to build a catalog. Using published optical and near-infrared data from the Multiwavelength Survey by Yale-Chile (MUSYC), we construct an IRAC-selected catalog, containing photometry in UBVRIz'JHK, [3.6 μm], [4.5 μm], [5.8 μm], and [8.0 μm]. The catalog contains 43,782 sources with S/N >5 at 3.6 μm, 19,993 of which have 13-band photometry. We compare this catalog to the publicly available MUSYC and FIREWORKS catalogs and discuss the differences. Using a high signal-to-noise sub-sample of 3391 sources with ([3.6] + [4.5])/2 * >10 11 M sun ) are passively evolving, in agreement with earlier results from surveys covering less area.

  6. Effect of postprocedural full-dose infusion of bivalirudin on acute stent thrombosis in patients with ST-elevation myocardial infarction undergoing primary percutaneous coronary intervention: Outcomes in a large real-world population. (United States)

    Wang, Heyang; Liang, Zhenyang; Li, Yi; Li, Bin; Liu, Junming; Hong, Xueyi; Lu, Xin; Wu, Jiansheng; Zhao, Wei; Liu, Qiang; An, Jian; Li, Linfeng; Pu, Fanli; Ming, Qiang; Han, Yaling


    This study aimed to evaluate the effect of prolonged full-dose bivalirudin infusion in real-world population with ST-elevation myocardial infarction (STEMI). Subgroup data as well as meta-analysis from randomized clinical trials have shown the potency of postprocedural full-dose infusion (1.75 mg/kg/h) of bivalirudin on attenuating acute stent thrombosis (ST) after primary percutaneous coronary intervention (PCI). In this multicenter retrospective observational study, 2047 consecutive STEMI patients treated with bivalirudin during primary PCI were enrolled in 65 Chinese centers between July 2013 and May 2016. The primary outcome was acute ST defined as ARC definite/probable within 24 hours after the index procedure, and the secondary endpoints included total ST, major adverse cardiac or cerebral events (MACCE, defined as death, reinfarction, stroke, and target vessel revascularization), and any bleeding at 30 days. Among 2047 STEMI patients, 1123 (54.9%) were treated with postprocedural bivalirudin full-dose infusion (median 120 minutes) while the other 924 (45.1%) received low-dose (0.25 mg/kg/h) or null postprocedural infusion. A total of three acute ST (0.3%) occurred in STEMI patients with none or low-dose prolonged infusion of bivalirudin, but none was observed in those treated with post-PCI full-dose infusion (0.3% vs 0.0%, P=.092). Outcomes on MACCE (2.1% vs 2.7%, P=.402) and total bleeding (2.1% vs 1.4%, P=.217) at 30 days showed no significant difference between the two groups, and no subacute ST was observed. Post-PCI full-dose bivalirudin infusion is safe and has a trend to protect against acute ST in STEMI patients undergoing primary PCI in real-world settings. © 2017 John Wiley & Sons Ltd.

  7. The Role of Free-Radicals in the Radiation Vulcanizing of Elastomers; Role des radicaux libres dans la vulcanisation radiochimique des elastomeres; O roli svobodnykh radikalov v protsesse radiatsionnoj vulkanizatsii ehlastomerov; Papel de los radicales libres en la radiovulcanizacion de los elastomeros

    Energy Technology Data Exchange (ETDEWEB)

    Kuz' minskij, A. S.; Fedoseeva, T. E.; Chertkova, V. F.


    izlucheniya v poslednee vremya ispol'zuetsya dlya sozdaniya promyshlennykh protsessov vulkanizatsii rezinovykh izdelij. Issledovateli udelyayut dostatochno bol'shoe vnimanie voprosam mekhanizma obrazovaniya trekhmernoj setki pod dejstviem izlucheniya; odnako do sikh por nedostatochno izucheny nachal'nye i promezhutochnye stadii radiatsionno-khimicheskikh reaktsij, vedushchikh k zashivaniyu molekulyarnykh tsepej, kotorye svyazany s obrazovaniem i gibel'yu svobodnykh radikalov, ion-radikalov i vozbuzhdennykh molekul. Izuchenie struktury i svojstv ehtikh chastits stalo vozmozhnym tol'ko s razrabotkoj i shirokim ispol'zovaniem metoda ehlektronnogo paramagnitnogo rezonansa (EHPR), pozvolyayushchego poluchit' neposredstvennuyu informatsiyu o strukture i svojstvakh paramagnitnykh chastits. Issledovanie protsessov rekombinatsii svobodnykh radikalov v linejnykh polimerakh daet vozmozhnost' podojti neposredstvenno k mekhanizmu radiatsionnoj vulkanizatsii. V poslednee vremya poyavilas' tendentsiya ispol'zovat' ioniziruyushchee izluchenie dlya vulkanizatsii sernykh vulkanizatov, tak kak sochetanie sernykh i uglerodnykh poperechnykh svyazej daet maksimal'noe uluchshenie fiziko-mekhanicheskikh svojstv izdelij. V svyaz'i s ehtoj novoj problemoj predstavlyalo interes izuchenie kineticheskikh svojstv svobodnykh radikalov v polimerakh s razvitoj prostranstvennoj strukturoj. Podrobno isledovalis' protsessy rekombinatsii svobodnykh radikalov, poluchennykh u-oblucheniem, v svyazi so strukturnymi osobennostyami linejnykh i sshitykh polimerov, a imenno - orientatsiej i vnutrennej podvizhnost'yu molekulyarnykh tsepej. V vysokoehlasticheskikh polimerakh tipa kauchukov, kharakterizukhshchikhsya bol'shoj vnutrennej podvizhnost'yu tsepej i maloj ehnergiej mezhmolekulyarnykh svyazej, pri temperaturakh vyshe T akty rekombinatsii svobodnykh radikalov osushchestvlyayutsya s ochen' bol'shimi skorostyami. Kontsentratsiya radikalov v obraztsakh kauchukov, obluchennykh v zhidkom azote, umen'shaetsya pri

  8. Wind tunel tests of Risoe-B1-18 and Risoe-B1-24

    Energy Technology Data Exchange (ETDEWEB)

    Fuglsang, P.; Bak, C.; Gaunaa, M.; Antoniou, I.


    This report contains 2D measurements of the Risoe-B1-18 and Risoe-B1-24 airfoils. The aerodynamic properties were derived from pressure measurements on the airfoil surface and in the wake. The measurements were conducted in the VELUX open jet wind tunnel, which has a background turbulence intensity of 1%, and an inlet flow velocity of 42 m/s. The airfoil sections had a chord of 0.600 m giving a Reynolds number of 1.6Oe106. The span was 1.9 m and end plates were used to minimize 3D flow effects. The measurements comprised both static and dynamic inflow. Static inflow covered angles of attack from 5o to 30 deg. Dynamic inflow was obtained by pitching the airfoil in a harmonic motion around various mean angles of attack. The test matrix involved smooth flow, various kinds of leading edge roughness, stall strips, vortex generators and Gurney flaps in different combinations. The quality of the measurements was good and the agreement between measurements and numerical CFD predictions with EllipSys2D was good. For both airfoils predictions with turbulent flow captured very well the shapes of lift and drag curves as well as the magnitude of maximum lift. Measurements of Risoe-B1-18 showed that the maximum lift coefficient was 1.64 at an angle of attack of approximately 13 deg. The airfoil was not very sensitive to leading edge roughness despite its high maximum lift. Measurements with stall strips showed that stall strips could control the level of maximum lift. The Risoe-B1-24 measurements showed that the maximum lift coefficient was 1.62 at an angle of attack of approximately 14 deg. The airfoil was only little sensitive to leading edge roughness despite its high relative thickness and high maximum lift. Measurements with delta wing shaped vortex generators increased the maximum lift coefficient to 2.02 and measurements with Gurney flaps increased the maximum lift coefficient to 1.85. Measurements with combination of vortex generators and Gurney flaps showed a maximum increase in the maximum lift coefficient to 2.17. At the design Reynolds number of 6Oe10{sup 6} numerical predictions showed that there was a clear increase in the maximum lift coefficient of 0.22 for Risoe-B1-18 and 0.21 for Risoe-B1-24. (au)

  9. Table of radionuclides (Vol. 5 - A = 22 to 244)

    International Nuclear Information System (INIS)

    Be, M.M.; Chiste, V.; Dulieu, C.; Mougeot, X.; Browne, E.; Chechev, V.; Kuzmenko, N.; Kondev, F.; Luca, A.; Galan, M.; Arinc, A.; Huang, X.


    methodologies to be used and the CD-ROM included with this monograph contains the evaluators' comments for each radionuclide in addition to the data tables included in the monograph. This volume includes the evaluation of the following radionuclides: 22 Na, 40 K, 75 Se, 124 Sb, 207 Bi, 211 Bi, 217 At, 222 Ra, 225 Ac, 228 Ra, 231 Th, 232 Th, 233 Th, 233 Pa, 234 Th, 235 U, 237 U, 238 Pu, 240 Pu, 241 Am, 242 Pu, 242 Am, 243 Am, 244 Am, 244 Am m . Primary recommended data comprise half-lives, decay modes, X-rays, gamma-rays, electron emissions, alpha -and beta- particle transitions and emissions, and their uncertainties

  10. Inoculation methods and virulence of Beauveria bassiana (Bals. Vuill. to Cosmopolites sordidus (Germar (Coleoptera:Curculionidae in laboratory / Métodos de inoculação e virulência de Beauveria bassiana (Bals. Vuill. a Cosmopolites sordidus (Germar (Coleoptera:Curculionidae em laboratório

    Directory of Open Access Journals (Sweden)

    Marilene Francelli


    Full Text Available The research aimed to assess different inoculation methods of Beauveria bassiana (Bals. Vuill. on Cosmopolites sordidus (Germar adults, in laboratory conditions on an isolates selection bioassay. Conidial suspensions of UEL151 strain were applied on insects through the following methods: spray, immersion, dorsal and ventral topical. Low mortalities were achieved for all inoculation methods, with a higher value for immersion (21.7% at 37 days after application (DAA, as the rest of methods were significantly lower. The evaluation must be extended to a maximum of 22 DAA because the sporulation rate (confirmed mortality / total mortality decreased with time in all methods, with values of 95.8 and 75.3%, at 22 and 37 DAA, respectively, on the immersion method. Dorsal and ventral topical methods caused not significant C. sordidus virulence, so new tests are necessary with different fungus concentrations.A pesquisa teve o objetivo de avaliar distintos métodos de inoculação de Beauveria bassiana (Bals. Vuill. em adultos de Cosmopolites sordidus (Germar em condições de laboratório para utilização em bioensaios de seleção de isolados. Suspensões de conídios do isolado UEL151 foram aplicadas nos insetos através dos seguintes métodos: pulverização, imersão, tópica dorsal e tópica ventral. Em todos os métodos de inoculação obtiveram-se baixos valores de mortalidade total e confirmada, com valor máximo para a imersão dos insetos (21,7% aos 37 dias após a aplicação (DAA, o qual foi significativamente maior ao resto dos métodos. Verificou-se que a avaliação deve ser de no máximo 22 DAA nas condições deste experimento, já que a taxa de esporulação (mortalidade confirmada/mortalidade total diminuiu com o tempo em todos os métodos, com valores de 95,8 e 75,3%, aos 22 e 37 daa, respectivamente no caso da imersão. Os métodos de inoculação tópica dorsal e ventral não causaram virulência significativa de C. sordidus com B. bassiana, pelo que se precisam pesquisar os mesmos, com diferentes concentrações do fungo as usadas neste ensaio.

  11. Hypertension Treatment in Patients with Metabolic Syndrome and/or Type 2 Diabetes Mellitus: Analysis of the Therapy Effectivity and the Therapeutic Inertia in Outpatient Study. (United States)

    Farský, Štefan; Strišková, Andrea; Borčin, Marián


    We have analysed the database of 1,595 consecutive patients visiting our department of cardiology and internal medicine clinic in 2005-2014. The analysis included 13,990 visit records, and the average number of visits per patient was 8.5 ± 7.0. Our goals were to evaluate the effectivity of hypertension treatment as for drug choice, decrease of sBP and dBP associated with a certain drug, a drug combination, and therapeutic inertia in patients with metabolic syndrome and/or diabetes mellitus. The final number of patients for analysis who fulfilled the inclusion criteria for interpenetration of both diagnostic circles was 570. Results . 15% of patients were treated using hypertension monotherapy, 70% of patients were treated using 2- to 4-drug combination therapy, and 15% of patients were treated using 5- to 6-drug combination. The drugs used most frequently were perindopril (perin), nitrendipine (nitre), amlodipine (amlo), telmisartan (telmi), hydrochlorothiazide (hydro), rilmenidine, and nebivolol (used in >100 patients). The most significant decrease of sBP was associated with treatment by nitre, hydro, telmi, and urapidil (>19 mmHg). The most significant decrease of dBP was associated with treatment by nitre, hydro, telmi, and verapamil (>10 mmHg). The most significant decrease of both sBP and dBP was associated with treatment using 3-drug combination of telmi + hydro + spironolactone (41 and 16 mmHg, resp.), telmi + hydro + nitre (34 and 15 mmHg, resp.), and telmi + hydro + urapidil (34 and 15 mmHg, resp.). At the last visit, 281 out of 413 patients at the first visit had sBP >140 mmHg (68%); that is, sBP control was 32%. At the last visit, 76 patients out of 217 at the first visit had dBP >90 mmHg (35%); that is, dBP control was 65%. Therapeutic inertia was calculated by evaluating the proportion of visits at which sBP was above the target for eligible visits minus the proportion of visits where the change was made in

  12. Effects of Ionizing Radiation on Murine Gene Expression in Skin and Bone (United States)

    Terada, Masahiro; Schreurs, Ann-Sofie; Shirazi-Fard, Yasaman; Alwood, Joshua; Tahimic, Candice; Sowa, Marianne B.; Globus, Ruth K.


    Long duration spaceflight causes a negative calcium balance and reduces bone density in astronauts. The potential for exposure to space radiation to contribute to lasting decrements in bone mass is not yet understood. Sustained changes to bone mass have a relatively long latency for development, however skin is a radiation sensitive organ and changes in skin gene expression may serve as an early radiation biomarker of exposures and may correlate with adverse effects on skeletal tissue. Previous studies have shown that FGF18 gene expression levels of hair follicles collected from astronauts on the ISS rose over time. In the hair follicle, FGF18 signaling mediates radioresistance in the telogen by arresting the cell cycle, and FGF18 has the potential to function as a radioprotector. In bone, FGF18 appears to regulate cell proliferation and differentiation positively during osteogenesis and negatively during chondrogenesis. Cellular defense responses to radiation are shared by a variety of organs, hence in this study, we examined whether radiation induced gene expression changes in skin may be predictive of the responses of skeletal tissue to radiation exposure. We have examined oxidative stress and growth arrest pathways in mouse skin and long bones by measuring gene expression levels via quantitative polymerase chain reaction (qPCR) after exposure to total body irradiation (TBI). To investigate the effects of irradiation on gene expression, we used skin and femora (cortical shaft) from the following treatment groups: control (normally loaded, sham-irradiated), and TBI (0.5 Gy Fe-56 600 MeV/n and 0.5 Gy H-1 150 MeV/n). Animals were euthanized one and 11 days post-IR. Statistical analysis was performed via a Student's ttest. In skin samples one day after IR, skin expression of FGF18 was significantly greater (3.8X) than sham-irradiated controls (3.8X), but did not differ 11 days post TBI. Expression levels of other radiation related genes (Nfe2l2, Trp53, Cdkn1a, FoxO3, Gadd45g, SOD1), was not different due to TBI at either time point. In bone (femora) TBI significantly increased (3.8X) expression of the pro-bone resorption cytokine, MCP-1, one day after TBI. FGF18 expression in skin and MCP- 1 expression in bone were found to be positively correlated (P less than 0.002, r=0.8779). Further, microcomputed tomography analysis of tibae from these animals showed reduced fractional cancellous bone volume (-21.7%) at 11 days post exposure. These results suggest that early radiation induced changes in FGF18 gene expression in skin may have value for predicting subsequent loss of cancellous bone mass.

  13. Velocidade de estabelecimento de acessos de amendoim forrageiro na Amazônia Ocidental Speed of establishment of accessions of forage peanut in the Western Amazon

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    Judson Ferreira Valentim


    Full Text Available O objetivo deste estudo foi avaliar a velocidade de estabelecimento de acessos de amendoim forrageiro (Arachis repens e Arachis pintoi, visando selecionar materiais adaptados aos sistemas intensivos de produção pecuária do Acre. O delineamento experimental utilizado foi de blocos casualizados, com quatro repetições. Os tratamentos consistiram de dois acessos de A. repens, sete acessos e duas cultivares de Arachis pintoi identificados como promissores para as condições ambientais de Rio Branco, Acre. Foi adotado como testemunha A. pintoi cv. Amarillo. Os acessos Ap 65, Ap 39 e Ar 10, com desempenho semelhante às cultivares Amarillo e Belmonte, destacaram-se por apresentar excelente velocidade de estabelecimento, com índice de sobrevivência das mudas e cobertura do solo superiores a 80% e comprimento dos estolões acima de 85 cm, respectivamente, aos 50, 70 e 120 dias após o plantio. Estes genótipos apresentaram produtividade de matéria seca (MS superior a 2.300 kg/ha, taxas de acúmulo de MS iguais ou superiores a 20 kg/ha/dia e teor de proteína bruta variando entre 17,9 e 21,7%, no final do período de estabelecimento. Entre os quatro grupos heteróticos, o formado pelo acesso Ap 39 destacou-se dos demais, por apresentar valores médios a altos para todas as características avaliadas, de acordo com a análise de agrupamento realizada pelo Método de Otimização de Tocher, com base na distância generalizada de Mahalanobis. Para que os materiais promissores possam ser recomendados para uso nos sistemas intensivos de produção de bovinos no Acre, devem ser desenvolvidos estudos adicionais com relação à: 1 produtividade e qualidade de MS nos períodos chuvoso e seco; 2 ocorrência de pragas e doenças; 3 produção de sementes; 4 adaptação a solos de baixa permeabilidade; 5 compatibilidade com gramíneas forrageiras e espécies arbóreas e arbustivas perenes; 6 produção animal e persistência sob pastejo.The objective of this study was to evaluate the speed of establishment of accessions of Arachis repens and Arachis pintoi with the purpose of selecting materials capable of producing adequate quantities of high quality forage, according to the requirements of the intensive cattle production systems of Acre. The experimental design was a randomized block with four replications. The treatments consisted of two accessions of Arachis repen, seven accession and two cultivars of Arachis pintoi, identified as promising for the environmental conditions of Rio Branco, Acre. The control treatment was A. pintoi cv. Amarillo. The accessions Ap 65, Ap 39 and Ar 10, with performance similar to the cultivars Amarillo and Belmonte, were selected because of their excellent speed of establishment with index of survival of stolon and rhizome plantings and ground cover higher than 80% and length of stolons above 85 cm, respectively, 50, 70 and 120 days after planting. These genotypes showed DM yields above 2,300 kg/ha, DM accumulation rates equal or superior to 20 kg/ha/day and crude protein content ranging from 17.9 to 21.7%, at the end of the establishment period. Among the four heterotic groups, the one consisting of accession Ap 39 outranked the others by presenting high mean values for all the characteristics evaluated according to the cluster analysis by the Tocher Optimization Method, based on the generalized Mahalanobis. For the recommendation of the promising accessions for use in the intensive cattle production systems in Acre, additional studies should be conducted in relation to: 1 dry matter yield and quality during the rainy and dry seasons; 2 occurrence of pests and diseases; 3 seed production; 4 adaptation to low permability soils; 5 compatibility with grasses and shrub and tree species; 6 animal production and persistence under grazing.