scholarly journals The treatment technique of dynamic analysis of highway slope diseases under complicated geological conditions of high temperature and rainy area

2017 ◽  
Author(s):  
Haiping Li ◽  
Rongxiang Shani
Keyword(s):  
High Temperature ◽  
Dynamic Analysis ◽  
Treatment Technique ◽  
Geological Conditions

Dynamic Analysis and Diagnostics of a High Temperature PEM Fuel Cell Stack

2013 ◽  
Vol 50 (2) ◽  
pp. 745-751
Author(s):  
Y. Zhu ◽  
W. H. Zhu ◽  
B. J. Tatarchuk
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
Dynamic Analysis ◽  
Pem Fuel Cell ◽  
Fuel Cell Stack ◽  
High Temperature Pem

Tunnel Collapse Treatment Technique Research in Xinjiang Tianshan High-Altitude, Low-Temperature Mountain

2014 ◽  
Vol 580-583 ◽  
pp. 1161-1167 ◽  
Author(s):  
Chun Sheng Zhu ◽  
Xiao Hua Yang
Keyword(s):  
Low Temperature ◽  
High Altitude ◽  
Deformation Rate ◽  
Tianshan Mountains ◽  
Stress And Strain ◽  
Outlet Section ◽  
Treatment Technique ◽  
Technical Effect ◽  
Geological Conditions ◽  
Tunnel Collapse

Based on YuXiMoLeGai tunnel in G217 Cholma to the Nalati highway, aiming at the outlet section of K723+911~K723+919 collapse, through model experiment and numerical calculation combined with on-site measurement, the article studies tunnel collapse treatment technique and technical effect in xinjiang tianshan mountains in the geological conditions of high altitude, low temperature, crushing of rock mass and rock rich in water. The results show that after the CRD method, expanding the scope of the grouting construction, increasing the number of small duct grouting lock foot, strengthening methods of supporting parameters are adopted, vault subsidence deformation rate is 0.4-1.5 mm/d, peripheral convergence deformation rate is 0.5-2.2 mm/d, stress the most unfavorable right hance monthly increase in stress and strain amplitude is 3.97% and 2.35% respectively.The treatment controls the land slide body deformation and stress well.

Dynamic Analysis of Transformers With Second-Generation High-Temperature Superconductors

2016 ◽  
Vol 26 (4) ◽  
pp. 1-5 ◽  
Author(s):  
Hongwei Liu ◽  
Ming Qiu ◽  
Jiahui Zhu ◽  
Junjie Liu ◽  
Shanshan Fu ◽  
...  
Keyword(s):  
High Temperature ◽  
Dynamic Analysis ◽  
Second Generation ◽  
High Temperature Superconductors

Synthesis and characterization of NaAlSi2O6 jadeite doped with different metallic oxides under high pressure and high temperature

2019 ◽  
Vol 33 (34) ◽  
pp. 1950427
Author(s):  
Liang Zhao ◽  
Hongan Ma ◽  
Chao Fang ◽  
Luyao Ding ◽  
Baomin Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
High Temperature ◽  
Raw Materials ◽  
Experimental Studies ◽  
Molar Ratio ◽  
Molecular Vibration ◽  
Fine Grained ◽  
Composition Formula ◽  
Geological Conditions

According to the mineral composition [Formula: see text] of jadeite, [Formula: see text] and [Formula: see text] with a molar ratio of 1:1 were selected as raw materials. One sample was undoped, and five samples were mixed with 0.4 wt.% [Formula: see text], MnO, CoO, [Formula: see text] and [Formula: see text], respectively. The experimental studies were executed under the synthetic condition of 5 GPa pressure and [Formula: see text] temperature using China-type large volume cubic high-pressure apparatus (CHPA) (SPD-6X1200). After the experiment, compositions of the synthetic jadeites were characterized by X-ray diffraction, microstructures characterized by field emission scanning electron microscopy (FESEM) and the high-resolution transmission electron microscopy (HRTEM), molecular vibration types investigated by Raman spectra. The color-causing ion of the synthetic jadeites was investigated by UV–Vis Spectra. The results show that the synthetic jadeites have excellent crystallinity and fine-grained texture and similar structural behavior with natural jadeite. UV–Vis Spectra indicated that different colors of samples have different ion absorption peaks, thus showing different colors. This experiment explored the geological conditions of synthetic jadeite by means of high pressure and high temperature (HPHT) to give a favorable experimental basis for synthetic jadeite and analyze the coloration mechanism of jadeite by way of ion-doping.

Quadrivalent praseodymium in planetary materials

2020 ◽  
Vol 105 (12) ◽  
pp. 1802-1811
Author(s):  
Michael Anenburg ◽  
Antony D. Burnham ◽  
Jessica L. Hamilton
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Rare Earth Element ◽  
Earth Element ◽  
Atacama Desert ◽  
Light Rare Earth ◽  
Ionic Radii ◽  
Natural Systems ◽  
Geological Conditions ◽  
Almost All

Abstract Praseodymium is capable of existing as Pr3+ and Pr4+. Although the former is dominant across almost all geological conditions, the observation of Pr4+ by XANES and Pr anomalies (both positive and negative) in multiple light rare earth element minerals from Nolans Bore, Australia, and Stetind, Norway, indicates that quadrivalent Pr can occur under oxidizing hydrothermal and supergene conditions. High-temperature REE partitioning experiments at oxygen fugacities up to more than 12 log units more oxidizing than the fayalite-magnetite-quartz buffer show negligible evidence for Pr4+ in zircon, indicating that Pr likely remains as Pr3+ under all magmatic conditions. Synthetic Pr4+-bearing zircons in the pigment industry form under unique conditions, which are not attained in natural systems. Quadrivalent Pr in solutions has an extremely short lifetime, but may be sufficient to cause anomalous Pr in solids. Because the same conditions that favor Pr4+ also stabilize Ce4+ to a greater extent, these two cations have similar ionic radii, and Ce is more than six times as abundant as Pr, it seems that Pr-dominant minerals must be exceptionally rare if they occur at all. We identify cold, alkaline, and oxidizing environments such as oxyhalide-rich regions at the Atacama Desert or on Mars as candidates for the existence of Pr-dominant minerals.

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