Hydrogen impurity check on sodium coolant through thermal dissociation of the hydride

1968 ◽  
Vol 24 (3) ◽  
pp. 274-278 ◽  
Author(s):  
M. N. Ivanovskii ◽  
G. D. Pavlova ◽  
B. A. Shmatko ◽  
A. V. Milovidova ◽  
�. E. Konovalov ◽  
...  
Keyword(s):  
Thermal Dissociation ◽  
Sodium Coolant ◽  
Hydrogen Impurity

Hydrogen in Compound Semiconductors

1992 ◽  
Vol 262 ◽  
Author(s):  
N. M. Johnson
Keyword(s):  
Deep Level ◽  
Thermal Dissociation ◽  
Experimental Studies ◽  
Compound Semiconductors ◽  
Hydrogen Impurity ◽  
Charged Species ◽  
Hydrogen Migration ◽  
Dissociation Energies ◽  
Layer Technique ◽  
Formation Of Complexes

ABSTRACTPhenomena associated with hydrogen in compound semiconductors include the formation of complexes with both dopant impurities and deep-level defects, the generation of hydrogen-related deep-level defects, and the migration of isolated hydrogen as a charged species. In addition to reviewing these phenomena, this paper describes the depletion-layer technique for determining thermal dissociation energies of hydrogen-impurity complexes and presents an updated tabulation of the parameters that have thus far been obtained from experimental studies to quantitatively describe hydrogen-dopant complexes and hydrogen migration in GaAs.

Thermal dissociation in the psychrophilic yeastCandida curiosa

1980 ◽  
Vol 20 (7) ◽  
pp. 471-474 ◽  
Author(s):  
M. Vidal-Leiria ◽  
N. Van Uden
Keyword(s):  
Thermal Dissociation

Kinetic studies on the thermal dissociation of β-cyclodextrin—benzyl alcohol inclusion complex

1994 ◽  
Vol 235 (1) ◽  
pp. 105-116 ◽  
Author(s):  
Ning Zhang ◽  
Jing-Hua Li ◽  
Qing-Tang Cheng ◽  
Ming-Wei Zhu
Keyword(s):  
Inclusion Complex ◽  
Benzyl Alcohol ◽  
Thermal Dissociation ◽  
Kinetic Studies

THE THERMAL DISSOCIATION OF CALCIUM HYDRIDE

1931 ◽  
Vol 53 (5) ◽  
pp. 1681-1689 ◽  
Author(s):  
Charles B. Hurd ◽  
Kenneth E. Walker
Keyword(s):  
Thermal Dissociation ◽  
Calcium Hydride

Dissociation and Subsidence of Hydrated Sediment: Coupled Models

2009 ◽  
Vol 27 (2) ◽  
pp. 105-131 ◽  
Author(s):  
Mohamed Iqbal Pallipurath
Keyword(s):  
Thermal Dissociation ◽  
Hydrate Formation ◽  
Coupled Models ◽  
Two Phase ◽  
Strength Deterioration ◽  
Intrinsic Kinetics ◽  
Radial Heat Flow ◽  
Radial Heat ◽  
Definition Of ◽  
Pressure Changes

Thermal dissociation of hydrated sediment by a pumped hot fluid is modeled. A radial heat flow from the hot pipe is assumed. The coordinate system is cylindrical. Three components (hydrate, methane and water) and three phases (hydrate, gas, and aqueous-phase) are considered in the simulator. The intrinsic kinetics of hydrate formation or dissociation is considered using the Kim-Bishnoi model. Mass transport, including two-phase flow, molecular diffusions and heat transfer involved in formation or dissociation of hydrates are included in the governing equations, which are discretized with finite volume difference method and are solved in an explicit manner. The strength deterioration of the hydrate bed as a result of dissociation is investigated with a geo-mechanical model. The way in which dissociation affects the bed strength is determined by plugging in the porosity and saturation change as a result of dissociation into the sediment collapse equations. A mechanism to measure the pore pressure changes occurring due to dissociation is developed. The rate of collapse as dissociation proceeds is determined and the model thus enables the definition of a safety envelope for gas hydrate drilling.

Sequence of phase equilibrium states in the Dy-Mn-O system during thermal dissociation of the DyMn2O5 compound

2006 ◽  
Vol 32 (2) ◽  
pp. 234-237
Author(s):  
L. B. Vedmid’ ◽  
V. F. Balakirev ◽  
A. M. Yankin ◽  
Yu. V. Golikov
Keyword(s):  
Phase Equilibrium ◽  
Thermal Dissociation ◽  
Equilibrium States

Experimental Study on Jet Breakup Behavior With Surface Solidification

2010 ◽  
Author(s):  
Takashi Wada ◽  
Yutaka Abe ◽  
Akiko Kaneko ◽  
Yuta Uchiyama ◽  
Hideki Nariai ◽  
...  
Keyword(s):  
Size Distribution ◽  
Reactor Vessel ◽  
Image Processing Technique ◽  
Core Material ◽  
Dominant Factor ◽  
Sodium Coolant ◽  
Molten Material ◽  
Breakup Length ◽  
Jet Breakup ◽  
Median Diameter

For the safety design of the Fast Breeder Reactor (FBR), the Post Accident Heat Removal (PAHR) is required when a hypothetical Core Disruptive Accident (CDA) occurs. In the PAHR, it is strongly required that the molten core material can be cooled down and solidified by the sodium coolant in the reactor vessel. There is high possibility for molten material to be ejected as a liquid jet into sodium coolant in the reactor vessel. In order to estimate whether the molten material jet is completely solidified by sodium coolant or not, it is necessary to understand the interaction between molten core material and coolant such as jet breakup and fragmentation behavior in coolant. The jet breakup behavior is the phenomenon that the front of molten material breaks up in coolant. To clarify the mechanism of jet breakup and fragmentation during the CDA for the FBR, it is necessary to understand the correlation between jet breakup lengths and size distribution of fragments when molten material jet interacting with coolant. The objective of the present study is to clarify the dominant factor of the jet breakup length and the size distribution of fragments experimentally. Molten jet of U-alloy 138 is injected into water as simulated core material and coolant by free-fall. The density ratio of core material and coolant is almost same as that of the real FBR system. The jet breakup behavior as interaction of molten material with coolant is observed with high speed video camera. Front velocity of the molten material jet is estimated by using the image processing technique. It suddenly decreases when the jet fall into the coolant. The jet breakup length estimated from observed images is compared with the breakup theories to understand the effect of experimental parameters for the jet breakup length. The solidified fragments are gathered and classified in size, and the mass in each size is measured. Median diameter is obtained from the mass distribution of the fragments. In comparison with interfacial instabilities, the median diameter of fragments shows the independent of relative velocity. The jet breakup lengths and median diameters compared with existing theories is discussed.

Thermal Dissociation of Hydrogen

1964 ◽  
Vol 40 (9) ◽  
pp. 2639-2652 ◽  
Author(s):  
George E. Moore ◽  
F. C. Unterwald
Keyword(s):  
Thermal Dissociation
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