Browsing by Issue Date, starting with "1991-11-01"

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STATISTICAL LINEARIZATION FOR MULTIINPUT MULTIOUTPUT NONLINEARITIES
(1991-11-01)
LIN, CA
;
CHENG, VHL
;
電控工程研究所
;
Institute of Electrical and Control Engineering
STATISTICAL LINEARIZATION FOR MULTIINPUT MULTIOUTPUT NONLINEARITIES
(1991-11-01)
LIN, CA
;
CHENG, VHL
;
電控工程研究所
;
Institute of Electrical and Control Engineering
INTERACTING-BOSON-FERMION-APPROXIMATION DESCRIPTION OF NEGATIVE-PARITY STATES IN EVEN-ODD YB ISOTOPES
(1991-11-01)
HSIEH, ST
;
CHUU, DS
;
電子物理學系
;
Department of Electrophysics
The negative-parity energy levels of the even-odd Yb isotopes, 163Yb, 165Yb, Yb-169, Yb-171, and Yb-173, are studied systematically within the framework of the extended interacting-boson-fermion-approximation (IBFA) model in which one odd fermion is couplied with a boson core. The boson core is described with the IBA model but allowing one boson to break into a quasifermion pair. The odd fermion is assumed to be in one of the f7/2 and p3/2 single-particle orbitals while the fermion pair is allowed to occupy the single-particle orbit i13/2. It was found that the negative-parity energy levels of these even-odd Yb isotopes and the values of transition quadrupole moments for the ground-state rotational band of Yb-173 can be reproduced in fairly good agreement with the observed data.
PRECISE DETERMINATION OF ALUMINUM CONTENT IN ALGAAS
(1991-11-01)
CHANG, KH
;
LEE, CP
;
WU, JS
;
LIU, DG
;
LIOU, DC
The Al composition of AlGaAs has been determined by four methods: high-resolution transmission electron microscopy (HRTEM), reflection high-energy electron diffraction (RHEED), photoluminescence (PL), and double-crystal x-ray diffraction (DCXRD). HRTEM is direct and the most accurate method because it does not involve any formula or extrapolation. Using the result obtained from HRTEM as a standard, we have calibrated the results from other methods. RHEED intensity oscillation is found to be accurate and reliable, if the growth conditions are correctly chosen. Comparing the PL results with those determined from HRTEM and RHEED, we suggest three formulas to determine the Al contents at different temperatures. We also proposed a polynomial to determine the Al concentration using the DCXRD measurement.
BEAM PROPAGATION METHOD ANALYSIS OF TRANSVERSE-ELECTRIC WAVES PROPAGATING IN A NONLINEAR TAPERED PLANAR WAVE-GUIDE
(1991-11-01)
SHI, TT
;
CHI, S
;
光電工程學系
;
電信研究中心
;
Department of Photonics
The propagation of TE-polarized guided waves in a nonlinear tapered waveguide is studied. The incident fields are chosen from the stable branches of the nonlinear dispersion curve in its uniform section. The propagations of the field in both directions are calculated by the beam-propagation method. Wave propagation in the tapered waveguide is discussed in terms of the nonlinear dispersion curves of the waveguide. Depending on the intensity, the field can radiate as a spatial soliton or it can have an abrupt transition between the guided mode and the surface polariton. The wave propagation of an incident field that is composed of a dominant TE0 wave and a small TE1 wave is investigated. Finally, using a property of this wave propagation, we present a new device for continuous signal routing.
FAULT-TOLERANT DECENTRALIZED COMMIT PROTOCOLS
(1991-11-01)
YUAN, SM
;
AGRAWALA, AK
;
資訊工程學系
;
Department of Computer Science
PHASE-SEPARATION IN AN FE-23.0MN-10.6AL-6.4 NI ORDERED ALLOY
(1991-11-01)
LIN, YL
;
CHOU, CP
;
交大名義發表
;
機械工程學系
;
National Chiao Tung University
DIRECT EVIDENCE OF GATE OXIDE THICKNESS INCREASE IN TUNGSTEN POLYCIDE PROCESSES
(1991-11-01)
HSU, SL
;
LIU, LM
;
LIN, MS
;
CHANG, CY
;
電子工程學系及電子研究所
The increase of the "effective" gate oxide thickness for W-polycide processes is studied. The samples with as-deposited and annealed W polycide are analyzed by secondary ion mass spectrometry, transmission electron microscopy (TEM), and high-frequency CV measurements. The TEM cross section shows that the gate oxide thicknesses are approximately 244 and approximately 285 angstrom for as-deposited and 1000-degrees-C annealed samples, respectively. The TEM results agree with that from CV measurements. The TEM analyses provide a direct physical evidence of an additional oxide thickness (approximately 41 angstrom) during the W-polycide annealing.
EXISTENCE AND MULTIPLICITY OF POSITIVE RADIAL SOLUTIONS FOR SEMILINEAR ELLIPTIC-EQUATIONS IN ANNULAR DOMAINS
(1991-11-01)
LIN, SS
;
PAI, FM
;
應用數學系
;
Department of Applied Mathematics
The existence and multiplicity of positive radial solutions of equation DELTA-u + f(u) = 0 is studied in annular domains in R(n), n greater-than-or-equal-to 2. It is proven that if f(0) greater-than-or-equal-to 0,f is somewhere negative in (0, infinity) and superlinear at infinity, then there is a large positive radial solutions on all annuli. If f(0) < 0 and satisfies certain conditions, then the equation has no solution if the annuli are too wide. Multiplicity results are also obtained when f has many humps with positive areas.
STYRENE MALEIC-ANHYDRIDE AND STYRENE GLYCIDYL METHACRYLATE COPOLYMERS AS INSITU REACTIVE COMPATIBILIZERS OF POLYSTYRENE NYLON-6,6 BLENDS
(1991-11-01)
CHANG, FC
;
HWU, YC
;
交大名義發表
;
應用化學系
;
National Chiao Tung University
The reactive type copolymers styrene maleic anhydride (SMA) and styrene glycidyl methacrylate (SG) are used as in situ compatibilizers in polyblends of polystyrene (PS) and nylon 6, 6 (N66). Both copolymers can react with N66 to form copolymers as effective compatibilizers to reduce interfacial tension and increase phase adhesion. However, the toughness of the compatibilized blends is significantly lower than of the corresponding noncompatibilized blends. Only a small fraction of SMA is actually reacted in a typical melt blending, and SG copolymer seems to be more reactive than SMA. The unreacted copolymers are expected to be distributed mostly in the PS phase because of their structural similarity. The reacted copolymers are not exclusively distributed along the interface; some may distribute in both matrices. SMA is known as a very brittle polymer, and the way it is distributed can greatly influence the toughness of the resulting blends. PS is also very brittle relative to N66, and moreover a high amount of SMA in the N66 phase is detrimental since N66 is responsible for the toughness of PS/N66 blends. The better compatibilized blends have the tendency to bring more SMA and reacted SMA into the N66 phase. The relative detrimental effect on the inherent toughness of N66 is much more severe than in case of PS, if they contain the same amount of SMA. This study demonstrates that polyblends with good compatibilizers do not guarantee toughness improvement. The way the compatibilizers affect the inherent properties of the matrix needs also to be taken into consideration.
FAULT-TOLERANT DECENTRALIZED COMMIT PROTOCOLS
(1991-11-01)
YUAN, SM
;
AGRAWALA, AK
;
資訊工程學系
;
Department of Computer Science
TIME-DEPENDENT TUNNEL CONVERGENCE .1. FORMULATION OF THE MODEL
(1991-11-01)
PAN, YW
;
DONG, JJ
;
交大名義發表
;
土木工程學系
;
National Chiao Tung University
The understanding of the mechanism of tunnel convergence is essential for designing the required support of a tunnel. To take various time effects on the convergence-confinement relation into account, it is possible to correlate different factors with time, then to deal with their collective effects. As a result, the time-dependent tunnel deformation problem can be modelled as a viscoelastic problem. The solutions of various visocoelastic models can be obtained from the corresponding elastic solution based on a standard procedure. In this paper, a hierarchical approach, which considers: (1) the rheological properties of a rock mass; (2) the advancement of the tunnel; and (3) the tunnel-support interaction is proposed to model the excavation/construction process during the tunnelling in a rock mass with rheological properties. The time-dependent factors considered in the proposed model are discussed. Subsequently, the theoretical formulation of this model is developed.
EXISTENCE AND MULTIPLICITY OF POSITIVE RADIAL SOLUTIONS FOR SEMILINEAR ELLIPTIC-EQUATIONS IN ANNULAR DOMAINS
(1991-11-01)
LIN, SS
;
PAI, FM
;
交大名義發表
;
應用數學系
;
National Chiao Tung University
The existence and multiplicity of positive radial solutions of equation DELTA-u + f(u) = 0 is studied in annular domains in R(n), n greater-than-or-equal-to 2. It is proven that if f(0) greater-than-or-equal-to 0,f is somewhere negative in (0, infinity) and superlinear at infinity, then there is a large positive radial solutions on all annuli. If f(0) < 0 and satisfies certain conditions, then the equation has no solution if the annuli are too wide. Multiplicity results are also obtained when f has many humps with positive areas.
TIME-DEPENDENT TUNNEL CONVERGENCE .2. ADVANCE RATE AND TUNNEL SUPPORT INTERACTION
(1991-11-01)
PAN, YW
;
DONG, JJ
;
交大名義發表
;
土木工程學系
;
National Chiao Tung University
A time-dependent model of tunnel convergence for tunnelling in a viscoelastic rock mass is proposed in the accompanying paper (this issue, pp. 469-475) to model the excavation-construction process during tunnelling in a rock mass with rheological properties. In this paper, a parametric study based on this model is presented to investigate the effects of the tunnelling advancing and support installation, respectively, on the tunnel convergence and on the support-pressure. Furthermore, a non-linear optimization procedure is suggested to calibrate the required model parameters from the in situ measured tunnel-convergence data. Discussion on the proper application of the proposed model and the optimization calibration are also included.
TRIANGULAR PHASE-MODULATION APPROACH TO AN OPEN-LOOP FIBEROPTIC GYROSCOPE
(1991-11-01)
CHIEN, PY
;
PAN, CL
;
CHANG, LW
;
光電工程學系
;
Department of Photonics
A new approach to an open-loop, all-fiber gyroscope with a wide dynamic range and a linear scale factor is described. For signal processing, the Sagnac phase shift is converted into a phase shift in the low-frequency electrical signal by using a triangular phase-modulation waveform followed by gate switching. The basic principle of this technique and experimental results are reported.
ANSATZ AND CONSISTENCY
(1991-11-01)
KAO, WF
;
交大名義發表
;
電子物理學系
;
National Chiao Tung University
;
Department of Electrophysics
We study the consistency conditions and the implications that come along with an operational definition of an Ansatz. The consistency checks are applied to justify skyrmion and monopole Ansatze. The Friedman-Robertson-Walker metric is discussed. We also comment on Coleman's conjecture and the importance of the spherically symmetric Ansatz.
MODEL-REFERENCE DEADBEAT CONTROL
(1991-11-01)
LEE, BK
;
CHEN, BS
;
LIN, YP
;
電子工程學系及電子研究所
;
電控工程研究所
The performance of deadbeat control systems is addressed. Analysis of conventional deadbeat control (CDC) reveals that, in addition to deadbeat tracking performance, other system properties, such as robustness and noise immunity, may need improvement. A model reference deadbeat control (MRDC) is proposed to remedy such deficiencies of CDC systems. Several examples are given to show that the MRDC scheme is better than the CDC scheme in attaining good transient response, noise immunity and robustness if a suitable reference model is selected.
2-WAVELENGTH LASER INTERFEROMETER BASED ON THE FREQUENCY-DIVISION-MODULATED LASER DIODE SOURCES
(1991-11-01)
CHIEN, PY
;
交大名義發表
;
光電工程學系
;
National Chiao Tung University
;
Department of Photonics
A two-wavelength interferometer based on the frequency-division-modulated laser diodes has been demonstrated. By employing this technique, the frequency difference between two laser diodes has been stabilized to less than 3.0 x 10(-9) and the synthetic heterodyne signal is also generated for measuring the optical phase shift absolutely.
ON THE EFFECT OF CENTRALIZATION ON EXPECTED COSTS IN A MULTILOCATION NEWSBOY PROBLEM
(1991-11-01)
CHANG, PL
;
LIN, CT
;
管理科學系
;
Department of Management Science
This paper deals with a single-period, single-product inventory model with several individual sources of demand. It is a multi-location problem with an opportunity for centralization. Two types of inventory system are considered in this paper: the decentralized system and the centralized system. The aim of this paper is to extend Eppen's model by adding the consideration of transportation cost to constitute a new inventory model. With this new inventory model we prove three theorems that include the results of Eppen's model.
PHASE-SEPARATION IN AN FE-23.0MN-10.6AL-6.4 NI ORDERED ALLOY
(1991-11-01)
LIN, YL
;
CHOU, CP
;
機械工程學系
;
Department of Mechanical Engineering