Raman scattering and photoluminescence investigation of YBO3:Eu3+ under high temperature and high pressure

2015 ◽  
Vol 3 (10) ◽  
pp. 2405-2412 ◽  
Author(s):  
W. S. Song ◽  
G. X. Y. Huang ◽  
R. C. Dai ◽  
Z. P. Wang ◽  
Z. M. Zhang
Keyword(s):  
High Pressure ◽  
Optical Properties ◽  
High Temperature ◽  
Raman Scattering ◽  
Dynamic Method ◽  
Effect Of Temperature ◽  
Temperature And Pressure

The effect of temperature and pressure on structure of YBO3:Eu was characterized by Raman scattering and on optical properties was analyzed by luminescent dynamic method.

Influence of Processing Parameters and Different Content of Tib2 Ceramics on the Properties of Composites Sintered by High Pressure -High Temperature (HP-HT) Method

2014 ◽  
Vol 59 (1) ◽  
pp. 205-209 ◽  
Author(s):  
I. Sulima ◽  
L. Jaworska ◽  
P. Figiel
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Processing Parameters ◽  
Structure Changes ◽  
High Pressure High Temperature ◽  
Mechanical And Physical Properties ◽  
Temperature And Pressure ◽  
Different Content ◽  
Scanning Electron ◽  
Properties Of Composites

Abstract In this paper the properties of the austenitic stainless steel reinforced with various volume fractions of TiB2 ceramics have been studied. The high pressure- high temperature (HP-HT) method of sintering was applied to the formation of composites. Samples were sintered at pressure of 5 and 7 ±0.2 GPa and temperatures of 1273 K and 1573 K. For the tested materials, the relative density, Young’s modulus and hardness were measured. In order to investigate the structure changes, the scanning electron microscope was used. The obtained results show that the temperature and pressure influence on the mechanical and physical properties of the investigated composites.

High Temperature and High Pressure ESP Performance Testing System Design

2013 ◽  
Vol 457-458 ◽  
pp. 423-427
Author(s):  
Xiao Qing Li ◽  
Xiao Yan Liu
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Heat Exchange ◽  
Liquid State ◽  
Constant Pressure ◽  
Hot Water ◽  
Testing System ◽  
Friction Resistance ◽  
High Temperature And Pressure ◽  
Temperature And Pressure

With the development of oilfield exploration, the performance of electric submersible pump (ESP) has been enhanced very fast. It requires testing techniques develop at the same time. The most outstanding question is the testing of high temperature and pressure ESP. A testing well was drilled in Daqing in 1992. It keeps the water liquid state on 150 centigrade by high pressure. This system can simulate operational mode 3000 meters under the ground. But many new ESPs have been produced these years. The quondam testing system couldnt meet the testing requirement. A new testing system is desiderated eagerly. This paper developed a high temperature and pressure ESP testing experimentation system. Hydraulic/thermodynamic analysis calculation has been carried on. Friction resistance from constant pressure point to the suction inlet of hot water pump and the ESP in heating-forced cycle and experimentation primary cycle are calculated respectively. Keeping the water liquid state on 180 centigrade, constant pressure value was fixed on 2.5 MPa. The heat load is calculated including the heat that the water in the system and the equipment need and the heat loss. In order to protect ESP from emanating too much heat to keep the temperature and pressure of the system steady, heat exchange system has been designed. Cold load and heat exchange square have been calculated. Friction resistance and the size of the cold water cistern have been calculated. These provide necessary academic foundation for the testing experimentation of high temperature and pressure ESP.

The Optical Properties of Liquid Chalcogens at High Temperature and Pressure

1994 ◽  
Vol 63 (4) ◽  
pp. 1611-1621 ◽  
Author(s):  
Hiroyuki Ikemoto ◽  
Itsuro Yamamoto ◽  
Makoto Yao ◽  
Hirohisa Endo
Keyword(s):  
Optical Properties ◽  
High Temperature ◽  
High Temperature And Pressure ◽  
Temperature And Pressure

scholarly journals Lightning-induced high temperature and pressure microstructures in surface and subsurface fulgurites

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Li-Wei Kuo ◽  
Steven A. F. Smith ◽  
Chien-Chih Chen ◽  
Ching-Shun Ku ◽  
Ching-Yu Chiang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Reference Sample ◽  
Near Surface ◽  
Landing Point ◽  
High Pressure Metamorphism ◽  
High Temperature And Pressure ◽  
Cloud To Ground Lightning ◽  
Temperature And Pressure ◽  
First Time

AbstractCloud-to-ground lightning causes both high-temperature and high-pressure metamorphism of rocks, forming rock fulgurite. We demonstrate that a range of microstructural features indicative of high temperatures and pressures can form in fulgurites at the surface and in fractures up to several meters below the surface. In comparison to a granite reference sample collected from a borehole at a depth of 138 m, microstructures in both the surface and fracture fulgurite are characterized by: (i) the presence of glass, (ii) a phase transformation in K-feldspar with the presence of exsolution lamellae of plagioclase, and (iii) high residual stresses up to 1.5 GPa. Since this is the first time that fracture-related fulgurite has been described, we also carried out a 1-D numerical model to investigate the processes by which these can form. The model shows that the electric current density in fractures up to 40 m from the landing point can be as high as that on the surface, providing an explanation for the occurrence of fracture-related fulgurites. Our work broadens the near-surface environments in which rock fulgurite has been reported, and provides a detailed description of microstructures that can be compared to those formed during other types of extreme metamorphic events.

Operation of Silicon Carbide Integrated Circuits under High Temperature and Pressure

2017 ◽  
Vol 2017 (1) ◽  
pp. 000526-000530
Author(s):  
M. Barlow ◽  
A. M. Francis ◽  
J. Holmes
Keyword(s):  
Silicon Carbide ◽  
High Pressure ◽  
High Temperature ◽  
Integrated Circuits ◽  
Integrated Circuit ◽  
Leading Edge ◽  
Limited Information ◽  
High Temperature And Pressure ◽  
Temperature And Pressure

Abstract Silicon carbide integrated circuits have demonstrated the ability to function at temperatures as high as 600 °C for extended periods of time. Many environments where high temperature in-situ electronics are desired also have large pressures as well. While some validation has been done for high pressure environments, limited information on the parametric impact of pressure on SiC integrated circuits is available. This paper takes two leading-edge SiC integrated circuit processes using two different classes of devices (JFET and CMOS), and measures the performance through temperature and pressure variation. Circuit functionality was verified at high temperature (475 °C) as well as high pressure (1700 psig).

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