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CAMAC specifications

Description: No Description Available.
Date: December 1, 1972
Creator: Kirsten, F.A.
Partner: UNT Libraries Government Documents Department

Stress-induced deformation of metals during fast-neutron irradiation

Description: From European conference on irradiation embrittlement and creep in fuel cladding and core components; London, UK (9 Nov Theoretical models for the deformation of metals subjected simultaneously to external loads and fast-neutron irradiation are discussed. The following models have been analyzed in detail: dislocation climb; climb controlled glide; and nucleation, growth, and unfaulting of dislocation loops. It is shown that the strains produced only by the climb of dislocations are equal to the isotropic swelling strains plus the thermal creep strains due to climb of dislocations. No irradiation-induced creep results from the climb of dislocations or growth of loops. The climb controlled glide of dislocations is a viable irradiation creep mechanism for low fluences at all temperatures or for all fluences at high temperatures. At low temperatures the hardening occurs by the elastic interaction of loops and dislocations. It is shown that the climb controlled glide of dislocations through the loop structure can explain the transient irradiation creep behavior. Steady-state creep, however, at low temperatures is explained by the stressaffected nucleation of dislocation loops. Comparison of the theoretical prediction with the experimental results suggests that stress not only influences the orientation of the loop nuclei but also enhances the interstitial loop nucleation and reduces the vacancy- loop nucleation. In addition, various mechanisms are discussed briefly for the effects of stress on the irradiationinduced swelling of metals. Since irradiation creep and swelling both occur by partial segregation of vacancies and interstitials it was concluded that the two phenomena are closely related. (auth)
Date: January 1, 1972
Creator: Wolfer, W.G. & Boltax, A.
Partner: UNT Libraries Government Documents Department

Physiological Studies on Vitreoscilla stercoraria

Description: In this article, Vitreoscilla stercoraria ATCC 15218 was studied to elucidate some of its physiological characteristics.
Date: December 1972
Creator: Mayfield, D. C. & Kester, A. S.
Partner: UNT College of Arts and Sciences

Cysts of Azotobacter vinelandii with Double Coats

Description: Article on members of the genus Azotobacter, which are characterized by their ability to form cysts.
Date: October 1972
Creator: Cagle, Gerald D. & Vela, G. Roland, 1927-
Partner: UNT College of Arts and Sciences

Effect of Peptone on Azotobacter Morphology

Description: Article on pleomorphism in cultures of Azotobacter vinelandii, induced by the addition of Difco peptone to the growth medium.
Date: July 1972
Creator: Vela, G. Roland, 1927- & Rosenthal, R. S.
Partner: UNT College of Arts and Sciences

Spent fuel shipping, reprocessing, and recycle fabrication in the HTGR fuel cycle

Description: From joint power generation conference; New Orleans, Louasiana, USA (16 Sep 1973). The High Temperature Gas Cooled Reactor (HTGR) fuel recycle operation is described. The description includes the HTGR spent fuel shipping system and the proposed method of reprocessing the spent fuel to recover the bred /sup 233/U and /sup 235/U. The process for refabricating the recovered fuel into recycle fuel is also discussed. (auth)
Date: December 15, 1972
Creator: Brooks, L.H.; Davis, C.R.; Peterman, D.D. & Spaeth, M.E.
Partner: UNT Libraries Government Documents Department

CP violation, neutral currents, and weak equivalence

Description: Within the past few months two excellent summaries sup{(1,2)} of the state of our knowledge of the weak interactions have been presented. Correspondingly, we will not attempt a comprehensive review but instead concentrate this discussion on the status of CP violation; the question of the neutral currents, and the weak equivalence principle.
Date: March 23, 1972
Creator: Fitch, V.L.
Partner: UNT Libraries Government Documents Department

Biological effects of daily inhalation of radon and its short-lived daughters in experimental animals

Description: From symposium on noble gases; Las Vegas, Nevada, USA (24 Sep 1973). Exposures of rats, mice, and hamsters for 90 hours per week to radon daughters nanging from 2000 to 8500 WL, with and without 18 mu g per liter uranium ore dust, caused marked lifeshortening in all three species. Marked reduction in body weights occurred in all three species, with weight losses of 30 to 50% of control animal values in all species after 31/2 months of exposures. Mice exposed to radon daughters and ore dust were particularly susceptible in terms of mortality, although the lungs of these animals showed very little pathological change. Classical radiation pneumonitis with alveolar septal fibrosis and occasional bronchiolar epithelial hyperplasia were the predominant deep lung lesions seen in all species. In contrast to hamsters exposed 30 hours per week to 1200 WL of radon daughters and uranium ore dust, proportionately more of the pathology was seen in the upper respiratory tracts of the hamsters in the present study. The contrast between markedly affected trachea and major bronchi vs. relatively little effects in deep lung was most evident in rats. Findings of severe suppurative laryngitis and bronchitis were frequent in rats, and may have been an important contributing factor to their death. These findings dictate further studies involving sacrifice and radioactivity analyses of tracheal and lung tissues to determine relative absorbed radiation doses at these sites for correlation with developing degenerative and proliferation changes of the respiratory tract in each species. (auth)
Date: January 1, 1972
Creator: Palmer, R.F.; Stuart, B.O. & Filipy, R.E.
Partner: UNT Libraries Government Documents Department