Preparation of vanadium-nitrogen alloy at low temperature by a coupled electric and thermal field

Vacuum ◽  
2022 ◽  
Vol 195 ◽  
pp. 110644
Author(s):  
Jianming Zhu ◽  
Peng Zhao ◽  
Minghai Jing ◽  
Hangjin Wu ◽  
Jiangjiang Li
Keyword(s):  
Low Temperature ◽  
Thermal Field ◽  
Nitrogen Alloy

scholarly journals An Analysis, Numerical Modeling and Experimental Verification of Low-Temperature Thermofoil Heaters

Eng ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 249-264
Author(s):  
Borislav Dimitrov
Keyword(s):  
Numerical Modeling ◽  
Low Temperature ◽  
Experimental Verification ◽  
Thermal Field ◽  
Simulation Experiment ◽  
3D Models ◽  
Modeling And Simulations ◽  
Multiphysics Simulations ◽  
Satisfactory Precision ◽  
Geometry Analysis

In this paper, an analysis of the geometry, numerical modeling, and experimental verification of thermofoil heaters for low-temperature applications is presented. The research suggests a calculation procedure of the thermofoil traces’ geometry, comprising the necessary electrical and thermal parameters in order for the characteristics of the heater to be fully defined according to the stipulated conditions required. The derived heaters’ geometry analysis procedure is depicted with two case studies, giving the sequence of the necessary calculations and their applications as part of a design task. Its continuation, the design approach, is developed with numerical modeling, based on Finite Element Methods (FEM) used for multiphysics simulations, including the thermal and electrical heaters parameters. The realized 3D models are used to depict the uniformity of the thermal field in the system heatsink-thermofoil heater. The results from analysis, modeling, and simulations are tested experimentally. The suggested geometry analysis and modeling approach are experimentally verified. The final results demonstrate satisfactory precision with a simulation–experiment mismatch in a range of 5–7%. As a vital product of experimental research, the maximum power density for the studied thermofoil heaters is derived for a range of temperatures and material characteristics.

RESEARCH ON CALCULATION METHOD OF THERMAL FIELD OF LARGE LNG-FSRU UNDER ULTRA-LOW TEMPERATURE

2015 ◽  
Vol 33 (3) ◽  
pp. 67-72
Author(s):  
Chong Wang ◽  
Hongde Qin ◽  
Zhenqiang Shi ◽  
Jinxin Li
Keyword(s):  
Low Temperature ◽  
Calculation Method ◽  
Thermal Field

scholarly journals Medley in finite-temperature field theory

1993 ◽  
Vol 71 (5-6) ◽  
pp. 280-284 ◽  
Author(s):  
Robert D. Pisarski
Keyword(s):  
Field Theory ◽  
Temperature Field ◽  
Low Temperature ◽  
Thermal Field Theory ◽  
Finite Temperature ◽  
Thermal Field ◽  
Gauge Theories ◽  
Kubo Formula ◽  
Finite Temperature Field Theory ◽  
Singularity Structure

Three subjects in thermal field theory are discussed; why in SU(N) gauge theories the Z(N) symmetry is broken at high (instead of low) temperature, the possible singularity structure of gauge-variant propagators, and the problem of how to compute the viscosity from the Kubo formula.

scholarly journals Thermal Field Stabilization of the Threshold Voltage of the Field Transistors of the Submicron Technology of the LSI

2018 ◽  
Vol 19 (4) ◽  
pp. 352-357
Author(s):  
S.P. Novosyadliy ◽  
V.M. Gryga ◽  
I.I. Kurysh ◽  
M.I. Melnyk
Keyword(s):  
Low Temperature ◽  
Interphase Boundary ◽  
Threshold Voltage ◽  
Thermal Field ◽  
Negative Charge ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Technological Method ◽  
Oxidizing Atmosphere ◽  
Gate System

On the basis of the analysis of the volume correspondence of the phases in the active gate system Si-SiO2, the possibility of obtaining a negative charge in the shutter system of submicron LSI is shown. Such a technological method has been experimentally verified at low temperature oxidation of silicon, which is patented. Studies have established that the magnitude of charge at the interphase boundary can be significantly influenced by introducing into the oxidizing atmosphere of halogen-containing compounds.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

Low temperature x-ray microanalysis of frozen-hydrated tobacco leaves

1984 ◽  
Vol 42 ◽  
pp. 284-285
Author(s):  
S. Edith Taylor ◽  
Patrick Echlin ◽  
May McKoon ◽  
Thomas L. Hayes
Keyword(s):  
Low Temperature ◽  
Lemna Minor ◽  
Root Tips ◽  
Tobacco Leaves ◽  
X Ray ◽  
Whole Cells ◽  
Carbon Coated ◽  
The Right ◽  
Beam Currents ◽  
The University

Low temperature x-ray microanalysis (LTXM) of solid biological materials has been documented for Lemna minor L. root tips. This discussion will be limited to a demonstration of LTXM for measuring relative elemental distributions of P,S,Cl and K species within whole cells of tobacco leaves.Mature Wisconsin-38 tobacco was grown in the greenhouse at the University of California, Berkeley and picked daily from the mid-stalk position (leaf #9). The tissue was excised from the right of the mid rib and rapidly frozen in liquid nitrogen slush. It was then placed into an Amray biochamber and maintained at 103K. Fracture faces of the tissue were prepared and carbon-coated in the biochamber. The prepared sample was transferred from the biochamber to the Amray 1000A SEM equipped with a cold stage to maintain low temperatures at 103K. Analyses were performed using a tungsten source with accelerating voltages of 17.5 to 20 KV and beam currents from 1-2nA.

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