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30 June 1989, Volume 7 Issue 2
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Articles
THE SATURATION PHENOMENA AND FOLDOVER EFFECTS OF THE FERROMAGNETIC RESONANCE IN YIG SINGLE CRYSTAL FILMS AT HIGH POWERLEVELS
ZHANG YOUTING
1989, 7(2): 95-100.
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This paper further investigated the characters of the pulsed microwave power ferromagnetic resonance (FMR) absorption in YIG single crystal films under per-pendicular pumping. The single crystal YIG film samples (5.1
μ
m thick and 500
μ
m in diameter) were prepared by the liquid phase epitaxy on gadolinium gallium garnet substrates and photolithographic etching procedures. The pulsed microwave power FMR absorption curves were measured for three different configuration pum-pings at a frequency of 9.18GHz under room temperature. The experimental results show that the main character of the FMR profiles under pulsed microwave powers with low duty cycles is a linewidth broadening effect due to the spin-wave instability processes, and the up-sweep and down-sweep FMR profiles are basically identical. However, the foldover effects of the FMR profiles occur at the high power levels.
THE CALCULATION OF STEADY TEMPERATURE FIELD AND ENERGY DISSIPATION OF ROLLING TIRE
C. OUYANG, XH ZHENGYI
1989, 7(2): 101-107.
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Using the thermal method, the inner temperature field and energy dissipation of a thermal-steady weighted rolling tire are calculated with a FORTRAN program, the outer boundary temperature and thermal constant of the material being treated as known values. The calculated result is in agreement with that of the experiment.
INVESTIGATION OF INDUCTIVE SEPTA WINDOW DISCONTINUITIES
RONG AOSHENG, LI SIFAN
1989, 7(2): 108-114.
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This paper presents a new type of waveguide discontinuities-inductive septa windows deposited on a dielectric substrate. A formulation for the equivalent circuit parameters of the discontinuities with superior convergency is derived by the transverse resonance method with the singular integral equation technique. As an example, an inductive bilateral septa window is computed. When the configuration is degenerated into an inductive all metal window with zero thickness, the numerical results are in good agreement with the available data in Literature[1].
ON THE CHARACTERISTICS OF DIELECTRIC COVERED WAVEGUIDE SLOTS
XIA KEJIN, YANG QIJI
1989, 7(2): 115-123.
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A mixed domain theory is developed to analyze the characteristics of the dielectric covered longitudinal waveguide slots. Using the methods of asymptotic term and singularity separations and the method of differentiation shifting, the quantity of computation is greatly reduced. The comparison of the computed results with the experimental results is given, and the reason for the non-resonance phenomenon of the large deviated slot on the flat waveguide is shown.
THE PHASE TRANSITION AND ELECTRICAL PROPERTIES OF In-Sb ALLOY FILMS
WANY HAO, GAN FUXI
1989, 7(2): 124-128.
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We investigated the dynamic processes of the phase transition of In
x
Sb
1-
x
(
x
=0.27~0.46) alloy films. The changes of the electrical properties due to the phase transition were studied. The relationships between the electrical properties of In-Sb films and their structures were discussed.
SOME STUDIES ON THE MODELING AND SIMULATION OF OPTICAL LITHOGRAPHY FOR VLSI
FENG XIANGMING, RUAN GANG
1989, 7(2): 129-136.
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In this article, some physical models related to the optical lithography simulation are discussed. A program, FUPLIS, which is used to simulate the VLSI lithography process has been developed. Some simulated results given by FUPLIS are presented. And it is shown that the simulated results play an important role in the understanding and guidance of the lithography process.
THE SIMULATION OF HOT CARRIER EFFECT IN SMALL GEOMETRY MOSFET
WEI TONGLI, HO YIE
1989, 7(2): 137-142.
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For practical use, a simulation method of hot carrier effect in the small geometry MOSFET is proposed by the direct solution of the Poisson equation and a corresponding software is developed in this paper. The result of the simulation is close to that calculated using an accurate two dimensional MOST analysis program and is in reasonable agreement with the experimental data. Also, the CPU time is one to two orders lower than that of the 2-D simulation.
THE EXPRESSIONS OF TRANSMISIVITY IN THE METHODOF LIGHT CUT-OFF AND THE RELATION BETWEEN COMPOSITION OF Hg
1-
x
Cd
x
Te AND TRANSMISIVITY
DAI XIANXI, WANG XINDE
1989, 7(2): 143-147.
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The expressions of transmisivity in the method of light cut-off (for short and long wave-length oases respectively) were dirived:
f
(
ν
c
)=1+15/(π
4
){
x
c
3
ln(1-e
-
x
c
)-3∑
n
=0
∞
e
-(
n
+1)
x
c
[2/((
n
+1)
4
)+(2
x
c
)/((
n
+1)
3
)+(
x
c
2
)/((
n
+1)
2
)]} (
x
c
=(
hν
c
)/
kT
≥ 2)
f
(
ν
c
)=15/(π
4
)
x
c
3
[1/(3)-(
x
c
)/8+(
x
c
2
)/60-0.0001984
x
c
4
+0.0000037
x
c
6
-7.5156325×10
-8
x
c
8
+1.6059044×10
-9
x
c
10
-……] (
x
c
≤ 2)
These expressions were used in the experimental measurements. It was proved that the expressions were useful in improving the accuracy and measuring speed. According to these expressions a table (with 3000 data and an accuracy of 10
-5
) and a useful expression (with a calculating accuracy of 2×10
-4
) of
x
(the composition of Hg
1-
x
Cd
x
Te versus F (transmisivity) were obtained:
x
=0.1334+0.8240
F
-2.140
F
2
+4.840
F
3
-5.450
F
4
+2.550
F
5
(0.17 <
x
< 0.443)
A CONTROL SYSTEM BASED AN MICROCOMPUTER FOR MOCVD
ZHAI QIGANG, XU LINMUU, CHEN WEIMIN, YU GUANGYI
1989, 7(2): 148-152.
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This paper describes a control system for MOCVD by the use of a microcomputer. The MOCVD is a metal-organic chemical vapor deposition (MOCVD) system specifically designed for developing epitaxial layers of gallium-arsenide and other Ⅲ-Ⅴ/Ⅱ-Ⅵ semiconductor compound materials. It is also useful for the investigation of super-lattice.
The control system consists of a microcomputer interface, a mass flow control for each gas, a temperature control for the baths for each metal-organic source, a temperature control for RF-heated susceptor, a gas switching manifold, a gas panel and so on.
The accuracy of the temperature control for the RF-heated susceptor is 0.05%, The error of the temperature control for metal-organic baths is about-15±0.01℃.
The fully automated process control is achieved in a safe, accurate manner by the use of the control system based on a microcomputer under any adverse circumstance.
THE HYPERPLANE RECOGNITION MODEL FOR THE PROCESSES OF RESTRICTED RESPONSE——THE APPLICATION OP HANDLING THEEESULTS OF EXPEKIMENTAL PLAN
XU CAN, ZHANG WEIMING, CHEN NIANYI, LIAN YOUSHEN, HE SHEQIAN
1989, 7(2): 159-164.
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This paper, based on the pattern recognition point of view, deals with the problems of restricted response within the narrow upper and lower control criteria by combining the eigenvalue decomposition method with the experimental design technique. The plane distributive structure in the experimental design space is determined by decomposing the covariance matrix of the specified pattern class. This method is used to analyze the relationship between the alloy composition and the alloy expansion coefficient. A quasilinear hyperplane is obtained in this design space. The stable design level is shown by the two-dimension display.
MEASURING SEA ICE THICKNESS WITH 10-CM MICROWAVE RADIOMETER
JIN HUIQIN, YANG GUANGLIN, CHEN DINGREN
1989, 7(2): 165-168.
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This paper describes the performance of the 10-cm microwave radiometer developed in our laboratory, as well as the principle and the method for the measurement of ice thickness. This equipment was used to conduct experiments during the flight test in Liaodong Bay in 1986.The characteristics of the brightness temperature changes with the ice thickness and the distribution of the ice types on the flight-path have been obtained. The results of the test show that the radiometer is very effective for the measurement of ice thickness.
THE INFLUENCE FACTORS AND PROPERTIES OF THE RADIATION SYNTHESIS HYDROGEL MATERIAL
YANG YUEQI, LIU YUMING
1989, 7(2): 169-173.
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This paper reports the results of the study on the influence factors and properties of the electron beam synthesis hydrogel material.
1 High quality hydrogel matericl can be obtained by the electron beam of high doge rate at the normal temperature.
2. In the range of l-10×l0Gy/s and l~2×l0Gy, the dose rate and the dose have no evident influence on the properties of soft contact lens.
3. When a moderate amount of water is added to the compounding, the elongation can be increased.
4. When the compounding includes the water-hating monomer such as butyl acrylate, the tensile strength of soft lens is increased and the water absorption is decreased.
5. The hydrogel material accords completely with the demands of biology.
COMPLEX RAY PARAXIAL APPROXIMATION:PRINCIPLE AND APPLICATIONS
RUAN YINGZHENG, LEOPOLD B. FELSEN
1989, 7(2): 174-178.
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Complex ray tracing provides an efficient approach to dealing with the propagation and scattering of HF Gaussian-like beams, but the search for the ray path from source to observer is the most time-consuming part in the numerical implementation of the complex ray scheme. Based on the complex ray theory and the perturbation principle, an approximation method for the evaluation of beam fields in the paraxial region is developed, which simplifies the computation substantially, The theory and procedure of the method are presented and some application examples and numerical results are given.
INTRINSIC GETTERING EFFECTIVENESS IN HEAVILY ARSENIC-DOPED SILICON
TAN SONGSHENG, ZHU DEGUANG, WANG ZIYUN
1989, 7(2): 179-181.
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The intrinsic gettering effectiveness in heavily arsenic-doped silicon has been investigated. It has been shown that the quality of epitaxial layers is improved by the intrinsic gettering process. The generation lifetime has increased by more than 15 times, and the diode reverse leakage current has been improved by two to three orders of magnitude.
Furthermore,the results indicate that the intrinsic gettering effect can perform in a longer distance than the extrinsic gettering effect by heavy boron diffusion.
AN ACCURATE SEMICONDUCTORIC TEMPERATURE TRANSDUCER
FANG PEISHENG
1989, 7(2): 182-184.
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A new semiconductor IC temperature transducer is described. This transducer has the difference
V
be
in the pair transistor base-emitter voltages, which is proportional to the absolute temperature. The test results show:the device has high accuracy of ±0.5℃ from -50℃ to 150℃, easy calibration ann low power dissipation.
MICROWAVE CHARACTERISTICS OF A FERROFLUID
XU PEIYING, LU HUAIXIAN, DU YOUWEI, WANG TINGXIANG
1989, 7(2): 185-188.
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The microwave tranamission characteristics of a ferrofluid (the carrier liquid being hydrocarbon and the magnetic particles being magnetite) magnetized with the biasing field H, have been measured. The phenomenon of ferro-magnetic resonance absorption in the ferrofluid has been observed. When the ferrofluid is biased far from the resonance field, low-loss transmission and non-reciprocal transmission, i.e., non-reciprocal attenuation and shift in the waveguide have been obtained respectively.
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Bimonthly, Founded in 1983
Editor-in-Chief:Wang Tingyun
ISSN 0255-8297
CN 31-1404/N
