Effects of power line voltage variations on different types of 400-W high-pressure sodium ballasts

1997 ◽  
Vol 33 (2) ◽  
pp. 472-476 ◽  
Author(s):  
D.S. Dorr ◽  
A. Mansoor ◽  
A.G. Morinec ◽  
J.C. Worley
Keyword(s):  
High Pressure ◽  
Power Line ◽  
Line Voltage ◽  
Different Types

scholarly journals Enzyme-catalyzed reactions in different types of high-pressure enzymatic reactors

2006 ◽  
Vol 12 (3) ◽  
pp. 159-163
Author(s):  
Mateja Primozic ◽  
Maja Habulin ◽  
Muzafera Paljevac ◽  
Zeljko Knez
Keyword(s):  
High Pressure ◽  
Atmospheric Pressure ◽  
Ceramic Membranes ◽  
Stirred Tank ◽  
Optimal Temperature ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Humicola Insolens ◽  
Different Types ◽  
Hydrolysis Of

The enzyme-catalyzed hydrolysis of carboxy-methyl cellulose (CMC) was performed in three different types of reactors; in a batch stirred-tank reactor (BSTR) operating at atmospheric pressure, in a high-pressure batch stirred-tank reactor (HP BSTR) and in a high-pressure continuous tubular-membrane reactor (HP CTMR). In the high-pressure reactors aqueous SC CO2 was used as the reaction medium. The aim of our research was optimization of the reaction parameters for reaction performance. All the reactions were catalyzed by cellulase from Humicola insolens. Glucose production in the high-pressure batch stirred-tank reactor was faster than in the BSTR at atmospheric pressure. The optimal temperature for the reaction performed in the BSTR at atmospheric pressure was 30?C, while the optimal temperature for the reaction performed in SC CO2 was 32?C. The influence of the application of tubular ceramic membranes in the high-pressure reaction system was studied on the model reaction of CMC hydrolysis at atmospheric pressure and in SC CO2. The reaction was catalyzed by cellulase from Humicola insolens covalently linked to the surface of the ceramic membrane. The hydrolysis of CMC in SC CO2 and at atmospheric pressure was performed for a long time period. The reaction carried out in SC CO2 was more productive than the reaction performed at atmospheric pressure.

Prediction of the failure probability of the overhead power line exposed to large-scale jet fires induced by high-pressure gas leakage

2021 ◽  
Vol 46 (2) ◽  
pp. 2413-2431
Author(s):  
Zhenhua Wang ◽  
Kai Shui ◽  
Fei You ◽  
Anne Simone Dederichs ◽  
Frank Markert ◽  
...  
Keyword(s):  
High Pressure ◽  
Failure Probability ◽  
Large Scale ◽  
Power Line ◽  
Gas Leakage ◽  
Overhead Power Line

Performance of different types of detectors in a high-pressure X-ray study of phase transition

1996 ◽  
Vol 14 (4-6) ◽  
pp. 287-294 ◽  
Author(s):  
N. Hamaya ◽  
N. Okabe ◽  
M. Yamakata ◽  
T. Yagi ◽  
O. Shimomura
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
X Ray ◽  
Different Types

Tecnología del almidón resistente / Technology of resistant starch

1997 ◽  
Vol 3 (3) ◽  
pp. 149-161 ◽  
Author(s):  
A. Escarpa ◽  
M.C. González
Keyword(s):  
High Pressure ◽  
Resistant Starch ◽  
Point Of View ◽  
Heating And Cooling ◽  
Technological Control ◽  
Different Types ◽  
Retrograded Starch ◽  
Fresh Foods ◽  
Resistant Starches ◽  
Starch Fraction

In recent years the discovery of the starch fraction called resistant starch (RS) has lead to numerous investigations. The nature of this fraction is very heterogeneous, and it comprises different types of resistant starches. From a technological point of view, RS type III or retrograded starch is the most important fraction. This resistant starch is formed after heating and cooling processes which therefore may occur in numerous fresh foods and foodstuffs. This brief review describes the gela tinization and retrogradation, which occur during heating and cooling, involved in the formation of resistant starch. The influence on RS formation of technological processes used in the manu facture of cereals has been studied as well as the influence of certain treatments used in legumes. In addition, the interactions between starch and nutrients such as proteins, lipids and sugars have also been studied. Recently, a high pressure autoclave has been used in a gelatinization system, which allows a better technological control and an increase in RS yields in comparison to conven tional systems.

scholarly journals REVIEW OF PROPERTIES, COMPOSITION AND DEFECTS OF DIFFERENT GLASSES WITH POTENTIAL USE FOR GAS HYDROGEN STORAGE SYSTEMS

2021 ◽  
Vol 6 (3) ◽  
pp. 142-147
Author(s):  
Andrei RĂȚOI ◽  
Corneliu MUNTEANU ◽  
Bogdan ISTRATE ◽  
Dan ELIEZER
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Tensile Strength ◽  
Hydrogen Storage ◽  
Storage Systems ◽  
Different Types ◽  
Research Findings ◽  
The Impact ◽  
Potential Use

The article reviews the research findings available on different types of glasses that presents potential use for high pressure gas hydrogen storage systems. An overview of the mechanical properties of different glasses, the influence of main constituents and the impact of defects to the strength of glass was presented. As part of this research, it can be concluded that the glass gets a significant improvement of tensile strength by reducing its dimensions to fibre sizes or capillaries due to reduced probability of defects presence.

scholarly journals Electronegativity under Confinement

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 6924
Author(s):  
Andrés Robles-Navarro ◽  
Carlos Cárdenas ◽  
Patricio Fuentealba
Keyword(s):  
High Pressure ◽  
Density Functional ◽  
Electronic Configuration ◽  
Chemical Bonds ◽  
Functional Theory ◽  
First Order ◽  
Hartree Fock ◽  
Confining Potential ◽  
Different Types ◽  
First Order Perturbation

The electronegativity concept was first formulated by Pauling in the first half of the 20th century to explain quantitatively the properties of chemical bonds between different types of atoms. Today, it is widely known that, in high-pressure regimes, the reactivity properties of atoms can change, and, thus, the bond patterns in molecules and solids are affected. In this work, we studied the effects of high pressure modeled by a confining potential on different definitions of electronegativity and, additionally, tested the accuracy of first-order perturbation theory in the context of density functional theory for confined atoms of the second row at the Hartree–Fock level. As expected, the electronegativity of atoms at high confinement is very different than that of their free counterparts since it depends on the electronic configuration of the atom, and, thus, its periodicity is modified at higher pressures.

Comparison between the Thermodynamical Behaviour of PdTe2 and PtTe2, while Subjected Isothermally to High Pressure

2007 ◽  
Vol 553 ◽  
pp. 63-68
Author(s):  
Veneta Grigorova ◽  
Dimitar Roussev ◽  
Stephane Jobic
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Entropy Generation ◽  
Direct Consequence ◽  
Structure Type ◽  
Different Types ◽  
The Difference ◽  
Thermodynamical Functions ◽  
Transformation Processes ◽  
Lubrication Properties

In the present paper we studied the thermodynamical behaviour under high pressure of two MTe2-type compounds (M = Pd, Pt) by applying the thermodynamical method, which we elaborated in previous studies [1,2]. The two discussed compounds are representatives of the CdI2 structure type, which is bi-dimensional and as such is atypical for the big family of lamellar MQ2- type dichalcogenides (Q=S, Se, Te). Specific of lamellar structure is the strong ionicity of the bonds. Its direct consequence is cleavage obtaining, lubrication properties, anisotropic physic properties. One of the most interesting points stands on the possibility for realising interactions between the layers of different types of ions. That could be done under high pressure by any of the following transformation processes: (i) a phase transition to the typical pyrite structure; (ii) a phase rearrangements changing the parameters of the crystal cell but keeping the 2D-type structure. The computation of the volumetric thermodynamical functions showed that both PdTe2 and PtTe2 do not undergo any classical phase transition [1]. But we observed a curious difference in their stability: PtTe2 loosed its stability quite fast and PdTe2 was quite stable. Aiming to clarify if the difference in the volumetric entropy generation was due to different phase rearrangements, we calculated the longitudinal thermodynamical functions. In such a way we detected that both PdTe2 and PtTe2 undergo a phase rearrangement. The change along one of the space axis in both compounds was compensated by the reverse change along the other space axis. Like this no changes at the volumetric level were observed. The longitudinal calculations gave an explanation for the differences in entropy generation at volumetric level: beyond the rearrangement point PdTe2 decreases its entropy generation, i.e. its new arrangement is somehow stable under increasing pressure. While, beyond its rearrangement point PtTe2 increases its entropy generation, i.e. even in the new arrangement it loses stability under increasing pressure. We conclude that both PdTe2 and PtTe2 do not undergo a classical phase transition at volumetric level. At longitudinal level both compounds undergo phase rearrangement. A difference between PdTe2 and PtTe2 is observed in their entropy generation beyond the rearrangement point.

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