Loading...
Home
Journal
Editorial Board
Instruction
Subscription
Solicit
Contact Us
中文
Table of Content
31 March 1990, Volume 8 Issue 1
Previous Issue
Next Issue
Articles
RADIATION DAMAGE AND ANNEALING BEHAVIOR OF As
2
+
IMPLANTED SILICON
LIN, FANG ZIWEI, XING KUNSHAN, NI BUSHAN, ZOU SHICHANG
1990, 8(1): 1-5.
Asbtract
(
366
)
PDF
(1333KB) (
104
)
Related Articles
|
Metrics
The radiation damage and annealing behavior of <100> Si implanted with 500 keV As
2
+
and 250 keV As
+
have been investigated. Experimental results show that the damage created by As
2
+
implantation is greater than that created by As
+
implantation. After rapid thermal annealing, the complete recovery from crystal damage, high substitution and electrical activation of implanted atoms can be obtained for both the As
2
+
and As
+
implantations. The carrier concentration profiles are different for the As
2
+
and As
+
Implanted samples, which can be explained by the rapid diffusion of impurities resulting from the serious damage enhancement induced by As
2
+
implantation.
A STUDY ON THE ELECTRICAL PROPERTIES OF RUBIDIUM ACID PHTHALATE (RAP) CRYSTALS
LIANG GUIJING, SHI ZIKANG, WANG LIQING, LIN YIDE, YANG TONGQIN, ZHENG XIUQIN
1990, 8(1): 6-12.
Asbtract
(
352
)
PDF
(474KB) (
84
)
Related Articles
|
Metrics
Rubidium acid phthalate (EAP) is an ionic organic polar crystal. In this paper, its dielectric property, DC-conductivities, P-E curve, as well as light transmission have been comprehensively studied and some qualitative explanations have been conducted thereupon in accordance with the characteristics of its crystal structure.
DISCONTINUITIES OF E-PLANE STRIP WITH PARTIAL HEIGHT AND THEIR APPLICATION TO MILLIMETER WAVE FILTERS
RONG AOSHENG
1990, 8(1): 13-18.
Asbtract
(
270
)
PDF
(386KB) (
74
)
Related Articles
|
Metrics
An efficient technique for analyzing the discontinuities of the partial height E-plane strip is presented. The curves for the equivalent circuit parameters of the discontinuities are obtained, which are of great value to engineering. A Ka-band bandpass filter composed of E-plane strips with partial height, for the first time, is fabricated. The experimental results show that this configuration has good bandstop performance.
AN EFFECTIVE METHOD FOR PARAMETER OPTIMIZATION OF GP MODEL
HAO YUE
1990, 8(1): 19-24.
Asbtract
(
499
)
PDF
(383KB) (
70
)
Related Articles
|
Metrics
An effective method for optimal parameter extraction of GP models in bipolar integrated circuits is suggested, Emphasis is placed on processing the iterative equations of GP models, The purpose is to reduce the requirements of the algorithm for initial model parameters and node voltages, And the iterative procedures of solving nonlinear equations for determining intrinsic junction voltages are replaced by an improved method, The method that box constraints are transformed simply is analyzed, A watchdog algorithm is used to find the solution of the constraint problem, Experiments show that the method is very effective for optimal parameters of GP models.
THE PROPERTIES OF MAXIMAL PREFIX CODES AND ENUMERATION
YANG YUECHI, QIU WEIDE
1990, 8(1): 25-30.
Asbtract
(
427
)
PDF
(384KB) (
98
)
Related Articles
|
Metrics
The properties of maximal prefix codes are established in this paper. We prove that tho family of maximal prefix codes forms a free monoid under the language concatenation, operation.
A recurrence formula for tho number of finite maximal prefix codes is given as follows:
Let
G
m
denote the number of maximal prefix codes in which the length of words is equal to
m
or less than it, we have then
G
m
=1+
G
m
-1
n
Where
n
is the number of letters of alphabet
X
.
ON THE ESTIMATION OF THE DYNAMICAL ROTARY TORQUE OF MECHANISMS WITH AN ELASTIC BAR
WU HONGZE
1990, 8(1): 31-35.
Asbtract
(
381
)
PDF
(355KB) (
72
)
Related Articles
|
Metrics
According to the Lagrangian equation, this paper introduces the dynamical equation for the mechanisms with, an elastic bar. It 19 known that Hooke's law 59 tenable only for the static condition and the dynamical equation is a special case when both angular velocity and angular acceleration are always zero. Up-to-date, torque meters both in China and in other countries are based on Hooke's law, and they can not measure the dynamical rotary torque.
This paper based on the dynamical equation describes the way to measure the dynamical rotary torque. The trouble in practice is how to determine the equivalent moment of inertia J and the viscous damping k. We use the technique of parameter estimation to solve this problem. Two computing approaches are discussed. The kernel of the whole matter is the least square method. At last, the optimal estimation of the dynamical rotary torque is given by computation.
A PLANARITY TESTING ALGORITHM OF HAMILTONIAN GRAPH
HU MEICHKNG
1990, 8(1): 36-40.
Asbtract
(
644
)
PDF
(342KB) (
91
)
Related Articles
|
Metrics
Planarity testing algorithm of graphs is a quite complex process. In this paper, we give a much simpler testing algorithm of the Hamiltonian graph. For the algorithms to test graphs for planarity, refer to the references.
THE INVESTIGATION OF ALGORITHM FOR THE SMALLEST WEIGHT SPANNING TREE IN LSI ROUTING
XIE GUOPING, YAO LINSHENG
1990, 8(1): 41-46.
Asbtract
(
383
)
PDF
(339KB) (
65
)
Related Articles
|
Metrics
In this paper, the smallest weight spanning tree in the non-oriented complete graph, which is usually encountered in IC's routing, is discussed. An algorithm for finding the smallest weight spanning tree is presented. It is called the upper-triangular-matrix algorithm (briefly as M-algorithm). The data structure that supports the algorithm is described. For the complete graph G(n, e), the complexities in computing and in storage of the M-algorithm are 0(n
3
) and 0(n
2
), respectively. For the same storage requirements, the M-algorithm is superior to Kruskal's algorithm in computing.
AN INVESTIGATION ON NEW HIGH SPEED CMOS LOGIC SERIES 74AC
XU KANG, LIU YUANHUA, ZHU YONGJIN, ZHOU XINXIANG, ZENG YIANGSHOU, XU YUANSEN
1990, 8(1): 47-54.
Asbtract
(
594
)
PDF
(1434KB) (
70
)
Related Articles
|
Metrics
The latest CMOS VLSI technologies have resulted in a new generation high speed logic circuit——2
μ
m advanced silicon gate CMOS logic series 74 AC, with the operating speed, max. frequency as, well as load capacity equal to or even better than those of the advanced 3rd generation bipolar TTL 74 ALS, while still retaining the basic advantages of the CMOS IC. In this paper, the design, fabrication and main AC/DC characteristics of this new high spead logic 74AG are presented, emphasis being put on analyzing and discussing its performance as compared, to other logic series, particularly to 74ALS. The perspective of its further development is also given. Using this new high speed logic series 74AC to replace the 74ALS will not only greatly reduce the total power dissipation of a high speed electronic system, but will also develop a new application field which is impossible to realize with the present 74 ALS, LS or 74HC. Its potential of further development seems to be quite great.
X-RAY DIFFRACTION STUDY ON THE RELATIONSHIP BETWEEN THE DEHYDRATION TEMPERATURE OF GOETHITE AND THE STRUCTURAL CHANGES OF HEMATITE
CHEN JIZHOU, JIANG SHICHENG, WANG JIALIN, WANG JUNQIAO
1990, 8(1): 55-60.
Asbtract
(
575
)
PDF
(1421KB) (
90
)
Related Articles
|
Metrics
In the X-ray powder diffraction patterns of hematite, formed by the dehydration of goethite, there are two markedly different groups of diffraction lines. One is comparatively sharp, whilst the other is rather diffuse. For the former, the line broadening effect is mainly dependent on the rearrangement of the oxygen Ions during phase change. For the latter, broadening of the line is related to the migration and rearrangement of the ferric ions. The present paper discusses in detail the
β
cos
θ
/λ~sin
θ
/λ curves of these two groups of diffraction lines, the mean crystallite size
D
, and the lattice deformation|(
Δd
)/
d
|.In the data treatment, two formulae are proposed to replace Jones' corrected curves for the facilitation of computerisation.
Furthermore, on the surface of the dehydration product at 250℃, S-shaped fractures are observed by the electron microscope. The origin of this phenomenon is discussed from the structural view of goethite.
A MÖSSBAUER SPECTROSCOPY STUDY OF Ni-Fe-Mo ELECTRODEPOSITED ALLOYS WITH HIGH PERMEABILITY
MENG QINGGANG, CHANG RUQIN, JIN HUIJUAN, XU GUIQIN, FENG LIQUN
1990, 8(1): 61-66.
Asbtract
(
338
)
PDF
(388KB) (
68
)
Related Articles
|
Metrics
Soft magnetic alloys of Ni-Fe-Mo are electrodeposited from ammoniacal baths containing complexing agents of sodium citrate and sodium pyrophosphate. Mössbauer spectroscopy has been used to study the magnetic texture of the electrodeposited alloys. An experiment and a calculation method of determining the preferential orientation of Fe atom magnetic moment on condition that there is the lower internal magnetic field are given. It is found that sodium citrate has a significant effect on the orientation of the Fe atom moment. The influence of the magnetic texture in the electrodeposited alloys on the magnetic properties is also discussed.
SIMULTANEOUS THERMAL ANALYSES OF
γ
-Fe
2
O
3
MAGNETIC POWDER IN HEAT TREATMENT PROCESS
CUI BAOYI, YANG ZHIJUN, YAO KANYI
1990, 8(1): 67-75.
Asbtract
(
347
)
PDF
(3566KB) (
84
)
Related Articles
|
Metrics
The most common process for making acicuiar particles of
γ
-Fe
2
O
3
from hydrated ferric oxide
α
(FeO) OH involves three steps dehydration → reduction → oxidation. Mechanisms of the porefilling and the densification in the process of dehydration and conditions of phase transformation in reduction and oxidation periods have Loon investigated by means of simultaneous thermogravimetric and differential thermal analyses from the energy point of view on purpose to obtain the ideal technologicas process of heat treatment. The dense product of
γ
-Fe
2
O
3
and coating with fewer porel and superior magnetic properties were obtained by the technological process which is better than the traditional one.
Research Notes
STUDIES IN CONTROLLING THE LENGTH OF
α
-FeOOH Effect of dispersers on the formation of
α
-FeOOH
GUAN YOUSHENG, JIN XIN, ZHU YUNYIN, WANG GUANG, QU JIANYING, HUAO LI, MA SIYUAN
1990, 8(1): 76-80.
Asbtract
(
468
)
PDF
(2239KB) (
86
)
Related Articles
|
Metrics
Sodium oxyalate and sodium hexametaphosphate were used as dispersing agents in the preparation of geothite (
α
-FeOOH). The experimental results showed that the dispersers had the effect of shortening the reaction time, promoting the geothite particle uniformity, preventing the denlrites in the geothitae growth process, and controlling the length of geothite.
CALCULATION OF MODE FIELD RADIUS AND SPLICE LOSSES IN BOW-TIE FIBER WITH ELLIPTICAL GAUSSIAN FIELD APPROXIMATION
HE ZHIJIAN
1990, 8(1): 81-84.
Asbtract
(
405
)
PDF
(224KB) (
70
)
Related Articles
|
Metrics
In this paper, a scalar variation analysis based on elliptical Gaussian field approximation of the fundamental mode of bow-tie fiber is presented. The mode field radii with, various structures are obtained. And also, the relations between the mode field radius and various splice losses of bow-tie fiber are shown in this paper.
OPTICAL FIBER TEMPERATURE SENSOR FOR MEDICAL USE TEMPERATURE MEASUREMENT SYSTEM IN GANGER TREATMENT BY MICROWAVE RADIATION
SHEN ZHONGYAO, ZENG XIAODONG, GUO YIJI
1990, 8(1): 85-87.
Asbtract
(
377
)
PDF
(191KB) (
96
)
Related Articles
|
Metrics
We have developed a new optical fiber temperature sensor for biomedical application, especially for temperature measurement in cancer treatment by microwave radiation. The experiments and clinical practice have shown that the optical fiber temperature measurement system is almost unaffected by the microwave radiation field. It can measure the temperature of the tissue which is heated by microwave radiation and it has come up to the requirements of clinical practice.
PRINCIPLE AND APPLICATION OF SMOOTH SPLINE METHOD USING SECTION-COORDINATE ROTATION
WANG SHAOPING, JIANG PEIZHENG, GU CHUANGANG, MIAO YONGMIAO
1990, 8(1): 88-90.
Asbtract
(
420
)
PDF
(200KB) (
79
)
Related Articles
|
Metrics
A new method for solving the large deflection curve by using the section-coordinate rotation approach is presented in this paper. The present method in suitable for derivation, interpolation and integration of enclosed curves and unenclosed curves with both
y
'>>1 and
y
'<<-1.
The method has been applied to the design of three-dimensional impellers and the smooth treatment of the indicator diagram of the internal combustion engine. Results show that the present method is satisfactory.
OPTIMAL DESIGN AND MANUFACTURE ANALYSIS OF HIGH-VOLTAGE PLANAR DEVICES
DENG BEI, BAO ZONGMING
1990, 8(1): 91-94.
Asbtract
(
259
)
PDF
(281KB) (
54
)
Related Articles
|
Metrics
This paper presents a numerical analysis of high-voltage planar silicon devices having field limiting rings. The two-dimensional Poisson equation is solved by using the finite difference method. The effects of surface charges, substrate impurity concentration and junction depth are described. Methods of overcomingthese influ ences in optimal design are put forward. Strict control of junction depth in manufacture is a very important key for guaranteeing the high-voltage capability.
Office Online
Authors Login
Peer Review
Editorial Work
Editor-in-Chief
Office Work
Journal
Just Accepted
Current Issue
Archive
Advanced Search
Volumn Content
Most Read
Most Download
E-mail Alert
RSS
Download
>
Links
>
JAS E-mail
CNKI-check
SHU
Information
Bimonthly, Founded in 1983
Editor-in-Chief:Wang Tingyun
ISSN 0255-8297
CN 31-1404/N
