scholarly journals Poética de lo transitorio: una revisión de Inert Gas Series/Helium, Neon, Argon, Krypton, Xenon/ From a Measured Volume to Indefinite Expansion, de Robert Barry (1969)

Author(s):  
Sandra Elisa Molina Franjola

Este estudio busca indagar la poética de la transitoriedad desplegada de Inert Gas Series/Helium, Neon, Argon, Krypton, Xenon/From a Measured Volume to Indefinite Expansion (Serie de gases inertes / Helio, neón, argón, criptón, xenón / De un volumen medido a una expansión indefinida), de Robert Barry (1969). Esta obra consistió en la liberación de gases desde sus contenedores a la atmósfera en diversos lugares de California, la cual fue anunciada por medio de un cartel blanco en el que se publicaron los datos de una dirección de correos y un número de teléfono, al que respondía una máquina contestadora con la grabación de su descripción. Con lo anterior, se pone en obra una dimensión temporal que se debate entre la fugacidad del gesto performático y la infinitud de lo que implica conceptualmente, que problematiza la inmaterialidad y que desplaza los valores plásticos a valores implícitos en la idea de obra como un ejercicio conceptual. Pero ¿qué implica la desmaterialización total del soporte de obra?, ¿qué es lo que intenta mostrar Serie de gases inertes mediante la alusión al tiempo? y ¿qué importancia tiene el arte, en tanto conceptual, para articular una idea de magnitud en la obra? Esta investigación busca responder a tales cuestionamientos desde la premisa de que la obra de Barry, como propuesta inmaterial, temporal y conceptual, logra presentar una serie de paradojas en torno al arte que articulan una poética de la transitoriedad, la cual es puesta a prueba mediante la comparación con otros ejemplos de obra (Rachel Whiteread, Oscar Muñoz y Olafur Eliasson). Finalmente, la poética de la transitoriedad exhibe la imposibilidad de retener el transcurso temporal mediante dispositivos plásticos que se proponen como un flujo, esto es, representan el cambio espacial/material en el tiempo.

1969 ◽  
Vol 47 (17) ◽  
pp. 1819-1827 ◽  
Author(s):  
E. P. Gordeyev ◽  
E. E. Nikitin ◽  
M. Ya. Ovchinnikova

Optical pumping experiments have yielded very large disorientation cross sections (40–100 Å2) for collisions between oriented 2P1/2 atoms of potassium, rubidium, cesium and thalium, and helium, neon, argon, krypton, and xenon atoms in their ground states, in contrast to the extraordinarily small cross section (< 10−5 Å2) for the depolarization of 2S1/2 atoms, as found by Gallagher and by Anderson and Ramsey. Franz, Leutert, and Shuey pointed out that, within the adiabatic model, the transition ψ(j = 1/2, m = 1/2) → ψ(j = 1/2, m = −1/2) is strongly forbidden in conformity with Kramer's theorem according to which it is impossible to split the two components ψ(j = 1/2, m = ± 1/2) in an electric field. In the present investigation it has been shown that the inclusion of an angular nonadiabatic operator (i.e. the operator responsible for Coriolis mixing of adiabatic electronic molecular states) makes possible such transitions. Calculations are presented of cross sections for the resulting depolarization induced in collisions between potassium, rubidium, and cesium, and inert gas atoms.


2012 ◽  
Vol 721 ◽  
pp. 211-215
Author(s):  
Tomoaki Hino ◽  
Yuji Yamauchi ◽  
Kiyohiko Nishimura ◽  
Yoshio Ueda

In-vessel tritium inventory in fusion reactors has to be reduced from a view point of safety in fusion reactors. It is required to evaluate the amount of tritium retained in tungsten plasma facing walls. The plasma discharge with hydrogen isotope (deuterium) was conducted to evaluate the tritium retention in tungsten. The glow discharges using helium, neon and argon were performed after the deuterium discharge to reduce the deuterium retention. The use of inert gas discharge little reduced the deuterium retention. Namely, the inert gas glow discharge is not useful to reduce the tritium inventory. The deuterium glow discharge significantly replaced the hydrogen in the tungsten wall into the deuterium. Thus, the deuterium glow discharge is quite useful to reduce the tritium inventory through the hydrogen isotope exchange. The use of neon or argon glow discharge followed by deuterium discharge can more reduce the tritium inventory. In addition, the tritium inventory can be easily reduced if the wall baking with a temperature of 700-800K is conducted.


2017 ◽  
Vol 487 ◽  
pp. 128-134 ◽  
Author(s):  
Xiang-Shan Kong ◽  
Jie Hou ◽  
Xiang-Yan Li ◽  
Xuebang Wu ◽  
C.S. Liu ◽  
...  

2021 ◽  
Vol 143 (6) ◽  
Author(s):  
Moulay Ahmed Janan ◽  
Mohamed Taqi ◽  
Hamid Chakir

Abstract In this work, we demonstrate the improvement of thermal performances of a heat pipe parabolic trough solar collector by optimizing the annulus space, between the evaporator and the glass envelope, and using an appropriate filling gas. We compared the system thermal effectiveness for nine filling gases (hydrogen, air, helium, neon, oxygen, nitrogen, argon, krypton, and xenon). The results showed that using xenon or krypton leads to the best thermal yield (70%). While krypton arises to be the most energetically efficient filling gas, argon, with a thermal yield of 62%, presents a best compromise as the cheapest inert gas. In addition, we showed that the annular space size should be less than a critical value to minimize heat losses and to reduce the material cost during manufacturing.


Author(s):  
O. M. Katz

The swelling of irradiated UO2 has been attributed to the migration and agglomeration of fission gas bubbles in a thermal gradient. High temperatures and thermal gradients obtained by electron beam heating simulate reactor behavior and lead to the postulation of swelling mechanisms. Although electron microscopy studies have been reported on UO2, two experimental procedures have limited application of the results: irradiation was achieved either with a stream of inert gas ions without fission or at depletions less than 2 x 1020 fissions/cm3 (∼3/4 at % burnup). This study was not limited either of these conditions and reports on the bubble characteristics observed by transmission and fractographic electron microscopy in high density (96% theoretical) UO2 irradiated between 3.5 and 31.3 x 1020 fissions/cm3 at temperatures below l600°F. Preliminary results from replicas of the as-polished and etched surfaces of these samples were published.


1978 ◽  
Vol 125 (6) ◽  
pp. 331-349 ◽  
Author(s):  
Boris M. Smirnov
Keyword(s):  

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