高压物理学报

Primary Research of Electrical Property of Pyrolyzed Polypyrrolone Film under Low Temperature and High Pressure

LIU Zhen-Xing, ZHANG Dian-Lin, PIAO Ming-Jun, WAN Mei-Xiang, LU Feng-Cai

1997, 11(1): 1-7 . doi: 10.11858/gywlxb.1997.01.001

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Abstract:
The temperature dependence of conductivity of polypyrrolone (PMDA-DAB) film pyrolyzed at different pyrolytic temperatures was measured as a function of the applied pressure. The obtained results indicate that the room temperature conductivity increases with the increase of the applied pressure and p...

Thermal Relaxation at Thin-Layer Interfaces: Its Significance to Shock Temperature Study

ZHOU Xian-Ming, JING Fu-Qian, HUANG Jian-Bin

1997, 11(1): 8-12 . doi: 10.11858/gywlxb.1997.01.002

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Abstract:
The thermal conduction problem of two interfaces for a sample/thin-layer/window configuration is solved for different initial temperature distribution, material thermal properties and different boundary conditions. Results reveal that the interface temperature history decreases sharply at first then...

H-Derivative of the Function and the Fractal Dynamics

DONG Lian-Ke, WANG Xiao-Wei

1997, 11(1): 13-20 . doi: 10.11858/gywlxb.1997.01.003

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Abstract:
In this paper, Hausdorff measure of the function f(x) and H-derivative of the function f(x) under Hausdorff measure are given as follows: HD[f(x)]= supn{nj=1|f(xj)-f(xj-1)|D} and f(1)H(x,0)=limx0[|f(x0+ x)-f(x0+ x)|D]/(2x)D=|f(x0)|D. The system of evolution equation of fractal dynamics is u(1)Ht=k(x...

Studies of 23 mm Electrothermal Chemical Launcher

ZHOU Zhi-Kui, CHEN Su-Nian, HAN Jun-Yu, LI Hong-Tao, SUN Chen-Wei, LI Chang-Qing, HUANG Yue

1997, 11(1): 21-26 . doi: 10.11858/gywlxb.1997.01.004

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Abstract:
The system of 23 mm electrothermal chemical launcher is described in this paper. It involves the power supply, control system, launching device and measuring technology. It is analyzed that the concentration of the hydrogen peroxide influences the launching property in the mixture of hydrogen peroxi...

Effects of the Shock Temperature and Its Effect on Phase Transition of Anatase TiO2

XU Kang, HE Hong-Liang, TAN Hua, LIU Jian-Jun

1997, 11(1): 27-31 . doi: 10.11858/gywlxb.1997.01.005

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Abstract:
A simple method was introduced to reduce the shock temperature of porous solid sample under shock wave loading by filling the sample with liquid paraffin. Anatase TiO2 was used as an example, results were compared for samples not filled and filled with liquid paraffin. In the former case, rutile is ...

Theoretical Research on Temperature Dependence of the Specific Heat at Constant Volume for Liquid Metals

TANG Wen-Hui

1997, 11(1): 32-38 . doi: 10.11858/gywlxb.1997.01.006

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Abstract:
Based on the experimental results, Grover[1] presented an approximation formula for the specific heat at constant volume of liquid metals versus temperature: cV3R-RT/Tm, where T is the temperature, Tm is the melting temperature, R is the gas constant, is an empirical constant, with value of 0.11~0.2...

A High Sensitive Transient Optic Pyrometer

LUO Jiao-Ming

1997, 11(1): 39-45 . doi: 10.11858/gywlxb.1997.01.007

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Abstract:
A new pyrometer has been developed, which uses: (a) dichroic splitters as pyrometer beamsplitters which increases the splitter efficient from about 25% (for a half-transmit half-reflect beamsplitter) to about 85%; (b) 50 dB amplifiers with an input electrical resistance less than 100 and response ti...

Electrical Properties and Phase Transitions in -BaB2O4 at High Pressure

BAO Zhong-Xing, LIU Cui-Xia, HUANG Chao-En, LIU You-Chen, CHEN Hong, WU Fei

1997, 11(1): 46-49 . doi: 10.11858/gywlxb.1997.01.008

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Abstract:
The capacitance, resistance-pressure relationships for the low temperature phase of barium metaborate (-BaB2O4) have been studied at room temperature at pressure up to 16 GPa in a diamond anvil cell using capacitance and resistance measurements. Experimental results indicate that anomalous changes i...

Experimental Study on Measuring Sound Velocities of Jilin Aerolite at High Pressure

YU Quan-You, WANG Gui-Chao, JIN Xiao-Gang, TIAN Jian-Hua, Lü Xiu-Sheng, HE Li-Hua

1997, 11(1): 50-55 . doi: 10.11858/gywlxb.1997.01.009

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Abstract:
The theory, technology and results of measuring sound velocity of Jilin aerolite at high pressure by using radiometry and using transparent material as the window in the pressure range from 42.2 to 113.2 GPa are described in this paper. According to the relation between sound velocity of Jilin aerol...

Study on Stress in Chemical Vapor Deposite (CVD) Diamond Films

TANG Bi-Yu, Jin Jiu-Cheng, LI Shao-Lü, ZHOU Ling-Ping, CHEN Zong-Zhang

1997, 11(1): 56-60 . doi: 10.11858/gywlxb.1997.01.010

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Abstract:
The stress in diamond films by the hot filament assisted chemical vapor deposition process was studied by X-ray diffraction technique. The investigation shows that the thermal stress is compressive in the temperature range studied and the intrinsic stress is tensile. The influence of various experim...

The Effects of Thickness and Back Surface of Diamond Film on Thermal Conductivity

GU Chang-Zhi, JIN Zeng-Sun, Lü Xian-Yi, ZOU Guang-Tian, ZHANG Ji-Fa, FANG Rong-Chuan

1997, 11(1): 61-65 . doi: 10.11858/gywlxb.1997.01.011

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Abstract:
In this paper, we described the effects of the thickness and back surface of diamond film on thermal conductivity. Diamond films with different thicknesses were synthesized by MWPCVD method. The results show that high thermal conductivity diamond film can be acquired with thickened film and removed ...

Theoretical Studies on Hugoniot Curves of Graphite

YANG Xiang-Dong, ZHANG Hong, ZENG Yong, WU Bao-Jian, CHENG Xin-Lu, HU Dong, JING Fu-Qian

1997, 11(1): 66-69 . doi: 10.11858/gywlxb.1997.01.012

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Abstract:
In this paper we have studied equation of state of graphite and diamond under high pressure with a unified scaling model. Simple additivity of the energy terms is assumed and the cold pressure curve is a modified Birch form. The lattice thermal effects can be computed by the Einstein model while the...

Study on the Effect of the Phase Transition of Pyrophyllite on the Resistance of the Heating Graphite Tube in High Pressure Reaction Cell

LUO Xiang-Jie, LUO Bo-Cheng, LIU Qiang, DING Li-Ye

1997, 11(1): 70-74 . doi: 10.11858/gywlxb.1997.01.013

PDF (607)

Abstract:
Under high temperature and high pressure (HTHP), we find that the process of the phase transition of pyrophyllite causes abnormal change of the resistance of the graphite tube indirectly heating the reaction cell. Several laws of the phenomenon and the interior relations between the laws and the pha...

Research of Modification on Shocked Aluminium Nitride Powder through X-Ray Diffraction

HAN Wei, LU Fang-Yun

1997, 11(1): 75-80 . doi: 10.11858/gywlxb.1997.01.014

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Abstract:
The changes of microstrain and dislocation density caused by shock wave on aluminum nitride ceramic powder have been researched, by X-ray diffraction method the relationship between the microstrain and the size of the crystallite is obtained. According to Warren-Averbch analysis, this means that the...

1997 Vol. 11, No. 1

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