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30 September 1990, Volume 8 Issue 3
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Articles
IMPROVED STAIRCASE APPROXIMATION ANALYSIS OF RADIALLY INHOMOGENEOUS FIBERS
XU SHANJIA, MA ZHEWANG
1990, 8(3): 189-196.
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In this paper, an improved staircase approximation method for analysing radially inhomogeneous fibers is advanced. This method combines the concept of the transmission line network with the rigorous mode matching procedure, and a new solving formula is obtained. Thus the procedure of the classical staircase approxi-mation is tremendously simplified. The analyses and computations of the dispersion, the Poynting flux distribution, the group velocity and the differential group delay for several representative radially inhomogeneous fibers of practical interest show that the present method is more succinct, more accurate and more rapidly convergent than the previous staircase approximation method.
APPLICATION OF THE HIGH TECHNOLOGY OF ULTRA-TRACE DETECTION BY RIS-TOFMS IN GEOLOGICAL PROSPECTING
CHEN DIEYAN
1990, 8(3): 197-206.
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A combination of Resonance lonization Spectroscopy and Time-of-Flight Mass Spectroscopy (RIS-TOFMS) is the newest and most sensitive method in modern ultra-trace detection. This paper first presents a short account ef the basic principles of RIS-TOFMS and its current applications. Then the application of RIS-TOFMS to geological prospecting of underground concealed ores of precious metals is discussed in detail, followed by a description of the progress of our laboratory work.
From the achievement and development of our work in recent years, we believe its prospect of practical development is bright. It will
(1) Develop new instrument and equipment f or prospecting and surveying underground concealed ores of rare and noble metals and rare-earth metals;
(2) Develop effective ship-born instrument and equipment for prospecting undersea mineral deposits;
(3) Develop into a high-tech research method in materials science (including super-conduction), thin film science, environmental science, biology, medicine, etc.
INVESTIGATION OF DEFECTS INDUCED BY HIGH FREQUENCY IN PECVD PASSIVATION FILM
LI DANZI, ZHAO LENGCHU, LAO FENGYING
1990, 8(3): 207-212.
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On the basis of experiments and theoretical analysis, the paper presents two kinds of defect as induced by high frequency in the PEOVD passivation films by using the parallel plate mode plasma equipment. One is the positively charged centre. It arises from the break of Si-O and Si-Si bands. The other one is the negatively charged centre which arises from the existence of ionogens, mainly (Si-H)N
x
. Both of them can be eliminated by annealing at some proper conditions.
AN EXTRACTION METHOD OF PARASITIC SOURCE/DRAIN RESISTANCE AND EFFECTIVE CHANNEL LENGTH
SUN XINGCHU
1990, 8(3): 213-217.
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Presented here is an accurate extraction method of parasitic source/drain resistance and effective channel length for MOSFET. The determination of these parameters is important to device modeling and analysis, and the fabrication process control. A special group of test devices was designed and a computer program was used for the parameter extraction procedure. The drain current characteristics of the devices were calculated by using the extracted parameters and compared with the measured data. The results showed a good agreement.
AN INFINITE TRIANGULAR CRACK UNDER MODE Ⅱ AND MODE Ⅲ LOADINGS
XU LINLIN, OUYANG CHANG
1990, 8(3): 218-222.
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This paper is the continuation of the study of an infinite triangular crack In an infinite elastic solid, in which the singular stresses for mode Ⅱ and mode HI crack problems are obtained. It is shown that they have the same singularities as mode I crack problems:they have the
r
-1/2
singularities along the straight border of the crack, and at the corner of the crack, the singularities become weak when the corner of the crack is convex and strong when concave.
PLASTICITY OF PERFECT FULL CROSS SHEAR COLD ROLLING AND O. HOFFMAN'S FORMULA
ZHIAO ZHENGCHEG, SONG MEIJUN, WANG MUQI
1990, 8(3): 223-231.
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New formulas for calculating the pressure per unit surface, mean pressure per unit surface and total compression load for perfect cross shear cold rolling are proposed:
p
x
=2
K
-
q
h
+(
q
h
-
q
H
)(ln
h
x
/
h
)/(ln
H
/
h
)
p
x
=2
K
-
q
H
+(
q
h
-
q
H
)(ln
h
x
/
h
)/(ln
H
/
h
)
The new formulas, compared with O. Hoffman's formula, have higher accuracy. Based on these new formulas, a new theory of friction-free hill in crass shear cold rolling is proposed.
ESTIMATION OF NONLINEAR PARAMETERS OF HYDRAULIC SERVO SYSTEM BY USING KÄLMAN FILTER
JIA LIANFENG, CHEN XUERUI, HU CHUNHUAI, KYOJIRO HAKOMORI
1990, 8(3): 232-240.
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For the high accuracy action of a hydraulic servo system, a linear dynamic model of the system including nonlinear elements is derived by using the Kälman filtering technique. Based upon the model derived, the flow gains to the displacement of the spool and to the load pressure of the servo valve, and the external torque are estimated.
ELECTRON MICROSCOPE ANALYSIS FOR MIXED NITROGEN GETTER
SHAO LIWEI, LU GUN, LIU JIEMEI, HU SIAN, KUANG SHIZHONG
1990, 8(3): 241-246.
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We analyzed the imported carbonyl nickcl powder, the home-made carbonyl nickel powder, and the surface shape and components of every position of the getter after vaporization, using the scanning electron microscope (SEM) and the transmission electron microscope (TEM). Important data for quality contrast between the carbonyl nickel powders was got and the cause of the "arch" problem was interpretated according to physical mechanisms.
We also made an XPS analysis of the vaporized body for the mixed nitrogen getter, which further proved and substantiated the interpretation of the physical mechanisms for the quality problem.
THE MODIFICATION OF n-CdTe PHOTOELECTRODE USING FeCl
3
SOLUTION
FAN QINBAI, YANG JUN, DENG XUNNAN
1990, 8(3): 247-251.
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The photoelectric conversion efficiency is enhanced about 20% by using FeCl
3
solution to modify the n-CdTe photoanode. By the aid of X-ray photoelectron spectroscopy and Auger electron spectroscopy,the variations of chemical compositions and surface structures after FeCl
3
modification are detected. The photoelectrochemical and electrochemical behaviors of the modified electrodes are examined by the spectral response, capacitance-potential, and electrochemical impedance measurements. The Fermi level pinning at the n-CdTe/solution interface is observed. Furthermore, a preliminary explanation for the modification action of FeCl
3
is given.
INVESTIGATION OF ILLUMINATIVE AND THERMAL DEGRADATION OF Cu
2
S/CdS SOLAR CELLS
XIAO YINONG, WANG SHOUCHEN, DONG DIANHONG, WANG FUSHAN, CHANG JUNLING, SHI ENDONG, LI HONGWEI
1990, 8(3): 252-256.
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The stability results for Cu
2
S/CdS solar cells tinder various illuminations and temperatures are presented. Data on cold-thermal circulation and simulation of atmosphere condition are given. The results are discussed. A new point of view on thermal degradation for Cu
2
S/CdS solar cells is suggested.
STRUCTURE CHARACTERISTICS AND FORMATION MECHANISMS OF CRYSTALS OF HYDRATED SILICATES
DUAN XUE, WANG ZUOXIN, YAO XIANG
1990, 8(3): 257-263.
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The crystals of hydrated silicates which were formed with pressure-steam were studied by using the scanning electron microscope, X-ray diffractometer, Fourier transformation infrared spectrometer and thermoanalyzer. According to the measurements, their structure characteristics were investigated, and the mechanisms for the formation were discussed in detail.
It was found from experiments that under the pressure-steam condition, the amorphous quartz and the crystalline quartz reacting with Ca(OH)
2
would mainly come to be Xonotlite and Tobermorite respectively. These reactions were able to explain the mechanism of hydrated crystals and the diffusing mechanism through the lattice, respectively. If he amorphous quartz and crystalline quartz existed together, the former reacted with Ca(OH)
2
at a higher rate than the latter, and the product was mainly Xonotlite.
Research Notes
STUDY ON THE IMPROVEMENT OF Li-CuO CELL PERFORMANC——INFLUENCE OF HEATED OuO ON CATHODE PERFORMANCE
LI CHENGPANG, YANG BIAO
1990, 8(3): 264-267.
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We find that after heat treatment, the utilization ratio of CuO increases. When the heating temperature is 700℃, the ratio is about 38% higher than that of the unheated CuO. The result shows that heated CuO is able to improve the electrochemical performance of the Li-CuO cells. Experiments with X-ray diffraction, differential thermal analysis and electronic scanning microscopy etc. reveal that after the 700℃ treatment, no new phases take place, but the grains become a little bit smaller and their shape changes slightly.
STUDIES OF EPITAXIAL GROWTH OF SILICON ON YTTRIA-STABILIZED ZIRCONIA
CHEN QINGGUI, SHI RIHUA
1990, 8(3): 268-270.
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Using the prolysis of SiH
4
, the epitaxial growth of silicon films on yttria-stabilized, cubic zirconia substrate has been investigated. The results indicate that high temperature annealing prior to epitaxial growth is necessary ior obtaining single crystalline silicon films. The annealing temperature of predeposition is above 1250℃ for 120 min. Using TEM and AES to analyze the films, it is shown that the single crystalline silicon films are good and have high resistivity.
A NEW Cr(VI)-ION SENSITIVE SEMICONDUCTOR DEVICE OF PVC MATRIX MEMBRANE
FANG PEISHENG, HUANG JIANG, FENG DAMING
1990, 8(3): 271-274.
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This paper presents an integrated circuit technique with the aid of Si
3
N
4
/SiO
2
as the insulator film, and PVC matrix membrane. The Cr
6+
-ISFET is developed. The test result has shown that Cr
6+
-ISFET exhibits a linear response to Cr ions within the concentration range of 1×10
-2
~1×10
-5
M
. The calibration plots have a slope of 56 mV/PCr
3
F at 25℃. The lower concentration limit of the linear response to Cr (Ⅵ) ions may be 1×10
-5
M
in HF solution.
A STUDY OF CO ADSORPTION ON GRAPHITE (0001) SURFACE
QU YIZHI, ZHANG KAIMING, LU DONG
1990, 8(3): 275-277.
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The EHT method and cluster models have been used to determine the configuration of carbon monoxide molecules adsorbed on graphite (0001) surface by minimizing the total energy of the system.
NEW CORRELATION FOR ESTIMATION OF CRITICAL COMPRESSIBILITY FACTOR OF NON-HYDROCARBONS
WANG NAIXU, CHANG BAOYI
1990, 8(3): 278-282.
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Substituting the average value of correlations for predicting
T
c
of non-hydrocarbons and the correlations for predicting
P
c
and
V
c
into the critical compressibility factor definition equation,
Z
c
=(
P
c
V
c
)/(
RT
c
) leads to the following correlation for estimating
Z
c
as
Z
c
=0.259+40/(
R
(
MN
)
0.5
(1.27660+92.76/(
T
b
)))
By combining the experimental values of 133 non-hydrocarbons' critical compressibility factors and the method of least square regression, we obtain the correlation for predicting
Z
c
as follows:
Z
c
=0.2772-0.533/((
MN
)
0.5
(1.27660+92.76/(
T
b
)))
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Bimonthly, Founded in 1983
Editor-in-Chief:Wang Tingyun
ISSN 0255-8297
CN 31-1404/N
