Browsing by Issue Date, starting with "1974-03"

Now showing 1 - 20 of 94937

Effect of Band Structure on Longitudinal Magnetoresistance in Semimetals and Semiconductors
(交大學刊編輯委員會, 1974-03)
吳啟宗
;
蔡健三
;
Chhi-Chong Wu
;
Jensan Tsai
The effect of the Cohen nonellipsoidal nonparabolic (NENP) band structure on the propagation of ultrasound in a semimetal such as bismuth in the presence of a dc magnetic field is investigated by using a quantum-mechanical treatment which is valid at high frequencies and in strong magnetic fields. It is found that the longitudinal magnetoresistance oscillates with the dc magnetic field. This dependence on the dc magnetic field arises from the nonlinear effect of the energy bands owing to the NENP model for the energy band structure of bismuth. We compare these results with those of the ellipsoidal parabolic (EP) band structure of bismuth. We also present numerical results for the nondegenerate and degenerate semiconductors like n-type InSb. It is found that the longitudinal magnetoresistance in the nondehenerate case changes with the dc magnetic field only for the nonparabolic band structure. In the degenerate case, however, the longitudinal magnetoresistance for the parabolic and nonparabolic band structures will oscillate with the dc magnetic field. These oscillations are interpreted as the so-called "giant quantum oscillations " which occur in a degenerate electron gas.
On the Modeling of Paging Algorithm by Finite Automata
(交大學刊編輯委員會, 1974-03)
楊超植
;
C.C.Yang
Two finite automata are devised for modeling two classes of demand paging algorithms. The first one of one input and three outputs models the class of algorithms each with a constant amount of allocated space. The second one of one input and six outputs models the class of algorithms each with a variable amount of allocated space. Some evaluation techniques are developed following each model. The memory states of the first class algorithm with the LRU, FIFO or FILO replacement policy or of the second class algorithm like the working set model or the page-turning rate algorithm are recursively defined by strings of the loaded pages. The adopted replacement policy and the state string updating procedure are imbedded in the recursive definition of a memory state. The operations like loading, tagging,reutilizing, etc. are reflected and differentiated by different outputs. Properties of some algorithms are developed. Sime such properties confirm with previous results and some others are updated to fit the finiteness assumtion of a reference string.
The Correlation Between CO2-N2-He Discharge and CO2 Laser
(交大學刊編輯委員會, 1974-03)
黃廣志
;
林緒德
;
祁甡
;
K.C.Huang
;
S.D.Lin
A self-made CO2 laser system is used to investigate the influence of additive gases on a CO2 laser and the effect of lasing action on a CO2-N2-He discharge. The optimum condition for maximum laser power output is found to be a function of gas mixing ratio, gas flow rate, total pressure, and discharge voltage. When the CO2 laser is lasing, both the discharge current and the electron temperature will decrease due to the fact that the lasing action makes the collisional cross-sections of N2 , CO and CO2 molecules with electrons increase.
A Note on the Solution of a Difference Equation with Three Indices
(交大學刊編輯委員會, 1974-03)
郭南宏
;
王樂羣
;
Nan-Hung Kuo
;
Leh-Chyun Wang
The generating-function technique for the solution of a linear three-index difference equation with constant coefficients is proposed. In addition, the algorithm for the proposed technique is presented.
A Self-biased Replacement Algorithm using the Characteristics of Markovean Program Model
(交大學刊編輯委員會, 1974-03)
鄭武皇
;
許濬
;
Wu-Haung Cheng
;
Jiunn Hsu
In this paper a self-biased replacement algorithm is developed. The algorithm is mostly suited for allocating system programs and library programs under multiprogramming and/or time-sharing environment. With biasing, the system performance is improved. It is also proved that the algorithm is optimal on macroscopic viewpoint. Since each reference string behaves a static referencing pattern, so it is feasible that the algorithm makes the optimal choice in selecting the candidate for replacement by using the characteristics of Markovean program model. And since in the present time and in the future time , system programs and library programs constitute dorminant part of software system, so it is worthy to develop a replacement algorithm using the characteristics of Markovean program model, although pre-runnings of programs are required.
Nullator's Stability Criterion for Linear, Time-Invariant Passive Networks
(交大學刊編輯委員會, 1974-03)
呂福釗
;
劉瑞文
;
Fu-Chao Lu
;
Ruey-Wen Liu
In this paper a new method of determining stability of the linear, time-invariant, passive, portless RLC network is presented. The theory of this method is based on Lasalle theorem, an extension of Liapunov's stability theorem . In order to simplify a complicated network, and to apply the stability theorem, an ideal element, called nullator, is introduced. The nullator is a one-port network element defined by υ=0 and i =0, this means that it is simultaneously an open circuit and a short circuit. (In system theory , nullator may be defined as an ideal component with zero input and zero output for all time). Some theorems that can be used for testing stability of the network are developed, and they are in terms of network graphs. With these network graph theorems, some of the network can be easily checked by inspection. If the network is more complicated, the simplification rules developed by nullator can be applied, and then it will not be difficult to find all eigenvalues of the state equation written from the simplified network. The step- by -step testing procedures will be described in section 4.
Optimal Singular Control Computation by Epsilon Technique
(交大學刊編輯委員會, 1974-03)
李茂全
;
唐明月
;
M.C.Lee
;
M.Y.Tarng
This paper extends the ε-technique which was proposed by A.V. Balakrishnan in 1968 to optimal singular control problems and shows that the extended technique can solve the singular control problem in a straight- forward way. A set of necessary conditions for optimality by using ε-technique for singular optimal control problems is derived and a computational algorithm is presented.
Some Fundamental Problems in the Theory of Queues
(交大學刊編輯委員會, 1974-03)
陳華燦
;
Wah-Chun Chan
The purpose of this article is an attempt to introduce some fundamental ideas and problems to the young engineers and scientists and to draw their attention to the queuing problems which they may encounter in every day life. It is with the hope that the references may provide a minimum guide for one to get into the field of queuing theory. When the population of a city is getting larger, it is natural to expect that the congestion phenomena in many aspects would become more severe. For the study of various types of queuing problems it is the theory of queues to serve as the most valuable means for such investigations.
FORTRAN中文輸入輸出程式
(交大學刊編輯委員會, 1974-03)
戚樹紅
本篇主要介紹的是一個以Fortran 語言來設計中文字根合成中文字的程式，此程式是綜合參考資料(1)、(2)、(3)所得之結果。中文字根是用relative line segment的方法表示的。
On Chiao Tung University's Laser Holographic System
(交大學刊編輯委員會, 1974-03)
黃廣志
;
吳國誠
;
K.C.Huang
;
K.C.Wu
The first laser holographic system in our country has been set up at the National Chiao Tung University. The main objective of this research notes is two folds: one is to show that we are able to make all kinds of holograms such as Leith-Upatniek hologram, and volumu hologram only by means of a simple set-up. he other is to present some technique information which could not be easily found in the journals. It can be sure that this information wold be very useful to the people who are interested in engaging in works of this field.
The Aluminum P-Silicon Schottky Barrier—Its Barrier Height and Spectral Response under Low Irradiance
(交大學刊編輯委員會, 1974-03)
馮德昭
;
胡定華
;
Der-Jau Fung
;
Ding-Hua Hu
Schottky barriers are formed by deposition of thin aluminum film onto p-silicon wafer with a very thin interfacial layer of natural oxide. The barrier height has been measured to be arrouud 0.80v, which is substautially greater than the formerly reported value by other investigators. This is believed due to the thin interfacial layer of oxide saturates the dangling bonds on the semiconductor surface and results in a less density of surface states. The spectral response of the shallow surface barrier under low irradiance is studied with a monochromatic light source from wavelength 0.4μto 0.9μ. The measued result, which is quite different from that of a conventional p-n junction photovoltaic cell, shows no diminution in the infrared region, and a quantum efficiency higher than 75% is obtained.
The Migrating Energy for Dislocation kink
(交大學刊編輯委員會, 1974-03)
謝正雄
;
J.S.Shie
The kink migration energy is evaluated by modifying the line tension model of dislocation. A sinusoidal variation of Pierels potential is used for dislocation, which gives a neglible migration energy for kink motions for typical metals. This confirms the general expectation that kinks can move freely along dislocation lines with no necessity of activation.
A FORTRAN Program for Calculating the Mean Square Values of the Electron Momenta in N-Electron Atoms He-Kr
(交大學刊編輯委員會, 1974-03)
李維銘
;
Lee Wei Ming
The one-electron part of the total mean square values of electron momenta in N-elevtron atoms can be expressed as <Ψ|Σ1 to N P|Ψ>. The total wave function Ψis a linear combination of spin-orbitals ø. Ø is expanded in terms of Slater type orbital (STO) . In this paper, a Fortran program was designed to solve this lengthy calculation.
A Study on Measures on Nonmeasurable Subsets
(交大學刊編輯委員會, 1974-03)
林妙英
;
Maiow-Ing Lin
Lower Bounds of Inner Products
(交大學刊編輯委員會, 1974-03)
鄧清政
;
Teng Ching Chen
In this paper, we shall discuss the lower bounds for real positive difinite inner products in vector spaces V or R. The inner product of two vectors v and w in Vis denoted by . The upper bound of this inner product is given by the famous Schwarz inequality which reads ||≦||v|| ||w|| for all v, w in V. Here, we intend to reverse the Schwarz inequality. Consequently,we have a lower bound of this inner product which gives a useful application to the approximation of the evaluation of integrations.
Study of the Blocking Effect of a Langmuir Probe in Medium Pressure Plasma Measurement
(交大學刊編輯委員會, 1974-03)
鄭信力
;
Jen-shih Chang
;
Sin-Li Chen
The blocking effect of a probe in plasma measurement has been studied theoretically for the cylindrical type probe of finite length and the disk type probe with finite thickness. For a disk probe, the blocking effect increases with increasing probe thickness. In obtaining the electron density Ne, if the probe thickness is not taken into account, the determined Ne will be smaller than its true value. A maximum percentage error of 85% may result with a disk probe if zero thickness is assumed. For a cylindrical probe, the blocking effect increases with increasing probe length. Zakharova's theory assuming an infinite length is not valid at d(=t/rν)≦3,where 2t=L, L is the probe length and rνis the probe radius. This theory is also applicable for obtaining Ne using a large cylinder type sampling probe. Some experiments are presented and discussed.
Minimum Test Sets for Fan-Out Free Networks and Two-Level Networks
(交大學刊編輯委員會, 1974-03)
李新滿
;
Shin-Maan Lee
;
Charles A. Harlow
Algorithms are preaented for generating minimum multiple-fault detection test lets for fan-out free networks and nonredundant two-level networks. A test set is minimum in the sense that there is no set with a smaller number of test patterns that detects all the faults in the network.
Stability of Nonlinear Systems with Characteristic Equations Having Complex Coefficients
(交大學刊編輯委員會, 1974-03)
蔡義從
;
韓光渭
;
Y.T.Tsay
;
K.W.Han
Stability criteria for nonlinear systems with linearized characteristic equations having complex coefficients are presented. The presented criteria are more general and the proofs are more complete than that in the current literature.
An On-Line Circuit Design System
(交大學刊編輯委員會, 1974-03)
郭南宏
;
鍾乾癸
;
黃炎松
;
Nan-Hung Kuo
;
Chyan Goei Chung
The purpose of this paper is two folds: (1)To introduce an on-line computer system for circuit analysis and design, which will be set up in Chiao-Tung University (2) To outline the basic method employed by us for developing an entire software system from system design to mask preparation.
白月
(1974-03-24)
管管