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< Page ,Total 178 >
EFFICIENT ANALYSIS OF A DIELECTRIC POST IN A RECTANGULAR WAVE-GUIDE BASED ON THE 2-DIMENSIONAL FD-TD METHOD SCIE
期刊论文 | 1993 , 6 (7) , 407-410 | MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
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Abstract :

A modified two-dimensional FD-TD method is used for the analysis of an H-plane waveguide loaded with a dielectric post of arbitrary shape, size, number, and location, and the dielectric post resonances and the application of measurement of permittivity constant are discussed. The numerical results are in good agreement with data available in the literature, and the versatility of this approach is given.

Keyword :

H-PLANE WAVE-GUIDE FD-TD DISCONTINUITY DIELECTRIC POST ELECTROMAGNETIC WAVE

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GB/T 7714 ZHANG, F , FU, JM . EFFICIENT ANALYSIS OF A DIELECTRIC POST IN A RECTANGULAR WAVE-GUIDE BASED ON THE 2-DIMENSIONAL FD-TD METHOD [J]. | MICROWAVE AND OPTICAL TECHNOLOGY LETTERS , 1993 , 6 (7) : 407-410 .
MLA ZHANG, F 等. "EFFICIENT ANALYSIS OF A DIELECTRIC POST IN A RECTANGULAR WAVE-GUIDE BASED ON THE 2-DIMENSIONAL FD-TD METHOD" . | MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 6 . 7 (1993) : 407-410 .
APA ZHANG, F , FU, JM . EFFICIENT ANALYSIS OF A DIELECTRIC POST IN A RECTANGULAR WAVE-GUIDE BASED ON THE 2-DIMENSIONAL FD-TD METHOD . | MICROWAVE AND OPTICAL TECHNOLOGY LETTERS , 1993 , 6 (7) , 407-410 .
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PULSED ELECTROACOUSTIC METHOD FOR MEASUREMENT OF SPACE-CHARGE DISTRIBUTION IN POWER-CABLES UNDER BOTH DC AND AC ELECTRIC-FIELDS SCIE Scopus
期刊论文 | 1993 , 26 (6) , 986-993 | JOURNAL OF PHYSICS D-APPLIED PHYSICS
WoS CC Cited Count: 76
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Abstract :

A modification of an earlier technique, to measure the distribution of space charge in the insulation of a coaxial cable, under both DC and AC electric fields, is described. The mathematical analysis is developed on the basis of acoustic waves propagating in media with cylindrical geometry. In order to measure the charge distribution in AC electric fields at any phase angle, a phase shift technique has been employed. The method of calibration of charge density is given, and the charge distribution in the insulation (2 mm in thickness) of XLPE cable has been measured under DC voltages (+/-40 kV, at room temperature) and AC voltage (17 kV peak, at 24-degrees-C and 105-degrees-C).

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GB/T 7714 LIU, RS , TAKADA, T , TAKASU, N . PULSED ELECTROACOUSTIC METHOD FOR MEASUREMENT OF SPACE-CHARGE DISTRIBUTION IN POWER-CABLES UNDER BOTH DC AND AC ELECTRIC-FIELDS [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 1993 , 26 (6) : 986-993 .
MLA LIU, RS 等. "PULSED ELECTROACOUSTIC METHOD FOR MEASUREMENT OF SPACE-CHARGE DISTRIBUTION IN POWER-CABLES UNDER BOTH DC AND AC ELECTRIC-FIELDS" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 26 . 6 (1993) : 986-993 .
APA LIU, RS , TAKADA, T , TAKASU, N . PULSED ELECTROACOUSTIC METHOD FOR MEASUREMENT OF SPACE-CHARGE DISTRIBUTION IN POWER-CABLES UNDER BOTH DC AND AC ELECTRIC-FIELDS . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 1993 , 26 (6) , 986-993 .
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NUMERICAL-ANALYSIS OF DOUBLE-INLET PULSE TUBE REFRIGERATOR EI SCIE Scopus
期刊论文 | 1993 , 33 (5) , 526-530 | CRYOGENICS
WoS CC Cited Count: 13
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Abstract :

A numerical model of a double-inlet pulse tube refrigerator (DPT) has been developed and the equations of continuity, momentum and energy (for both gas and solid) are solved numerically. The mass flow through the bypass valve depends on the pressure difference between either side of it. The results of numerical analysis reveal the internal process occurring in the DPT. Predictions show that the DPT can obtain higher refrigeration power with lower P-V work than does the conventional orifice version; the bypass valve in the DPT has a significant effect on the phase and amplitude of the dynamic parameters.

Keyword :

DOUBLE-INLET PRINCIPLE REFRIGERATION PULSE TUBE REFRIGERATORS

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GB/T 7714 WANG, C , WU, PY , CHEN, ZQ . NUMERICAL-ANALYSIS OF DOUBLE-INLET PULSE TUBE REFRIGERATOR [J]. | CRYOGENICS , 1993 , 33 (5) : 526-530 .
MLA WANG, C 等. "NUMERICAL-ANALYSIS OF DOUBLE-INLET PULSE TUBE REFRIGERATOR" . | CRYOGENICS 33 . 5 (1993) : 526-530 .
APA WANG, C , WU, PY , CHEN, ZQ . NUMERICAL-ANALYSIS OF DOUBLE-INLET PULSE TUBE REFRIGERATOR . | CRYOGENICS , 1993 , 33 (5) , 526-530 .
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ELECTRICAL NONUNIFORMITY OF GRAIN-BOUNDARIES WITHIN ZNO VARISTORS SCIE Scopus
期刊论文 | 1993 , 76 (5) , 1150-1155 | JOURNAL OF THE AMERICAN CERAMIC SOCIETY
WoS CC Cited Count: 39
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Abstract :

ZnO varistors with and without ZnO crystalline seeds have been prepared through conventional ceramic processing. Their electrical nonuniformity has been carefully examined using microcontact measurements of single grain boundaries, current-voltage (I-V) characteristics, and dielectric temperature spectra of bulk samples. Three types of grain boundaries with barrier heights of 0.2, 0.5, and 0.6 eV are identified in a ZnO varistor with the seeds, while only one with 0.4 eV barrier height has been found in a varistor without the seeds. Using a computerized electric circuit simulation, the influence of boundary thickness and grain size on I-V characteristics of varistor is investigated extensively. The simulated results show that currents passing across various grain boundaries are quite different. For a model varistor (1 x 1 x 1 mm3) with different grain size, a good agreement between measured data and simulated curves can be achieved.

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GB/T 7714 SUN, HT , ZHANG, LY , YAO, X . ELECTRICAL NONUNIFORMITY OF GRAIN-BOUNDARIES WITHIN ZNO VARISTORS [J]. | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 1993 , 76 (5) : 1150-1155 .
MLA SUN, HT 等. "ELECTRICAL NONUNIFORMITY OF GRAIN-BOUNDARIES WITHIN ZNO VARISTORS" . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY 76 . 5 (1993) : 1150-1155 .
APA SUN, HT , ZHANG, LY , YAO, X . ELECTRICAL NONUNIFORMITY OF GRAIN-BOUNDARIES WITHIN ZNO VARISTORS . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 1993 , 76 (5) , 1150-1155 .
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CRITICAL-ASSESSMENT OF THE LOCAL CLEAVAGE STRESS SIGMA-ASTERISK-F IN NOTCH SPECIMENS OF C-MN STEEL SCIE Scopus
期刊论文 | 1993 , 24 (6) , 1381-1389 | METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
WoS CC Cited Count: 37 SCOPUS Cited Count: 35
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Abstract :

An elastic-plastic finite element method (FEM) was used to calculate the stress and strain distributions ahead of notches with various root radii in a bending specimen of C-Mn steel with grain sizes of 10 and 30 mum. By accurately measuring the distance of the cleavage initiation site from the root of the notch, the local cleavage stress sigma(f)* was measured. When the notch radius increased from 0.25 to 1.0 mm, the distribution of high stress had a definite variation but the sigma(f)* remained relatively constant. In notch specimens with different root radii, the critical fracture event is identical, i.e., propagation of a ferrite grain-sized crack into the neighboring matrix. Therefore, the sigma(f)* is mainly determined by the length of the critical microcrack, here, the size of ferrite grain instead of the high stress volume for finding an eligible brittle particle. The critical strain for initiating a crack was about 1 pct. The cleavage site ahead of a notch was related to the relative distributions of stress and strain and the random distribution of the weakest grains. The higher fracture load of the fine-grain material can be attributed to its higher value of sigma(f)*/sigma0 as compared with the coarse-grain. The sigma(f)*/sigma0 is a potential engineering parameter for toughness assessment in notch specimens.

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GB/T 7714 YAN, C , CHEN, JH , SUN, J et al. CRITICAL-ASSESSMENT OF THE LOCAL CLEAVAGE STRESS SIGMA-ASTERISK-F IN NOTCH SPECIMENS OF C-MN STEEL [J]. | METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE , 1993 , 24 (6) : 1381-1389 .
MLA YAN, C et al. "CRITICAL-ASSESSMENT OF THE LOCAL CLEAVAGE STRESS SIGMA-ASTERISK-F IN NOTCH SPECIMENS OF C-MN STEEL" . | METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 24 . 6 (1993) : 1381-1389 .
APA YAN, C , CHEN, JH , SUN, J , WANG, Z . CRITICAL-ASSESSMENT OF THE LOCAL CLEAVAGE STRESS SIGMA-ASTERISK-F IN NOTCH SPECIMENS OF C-MN STEEL . | METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE , 1993 , 24 (6) , 1381-1389 .
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THEORETICAL-STUDY OF FATIGUE LIMIT FOR CRACK SCIE Scopus
期刊论文 | 1993 , 36 (5) , 602-611 | SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY
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The material parameter rho* - 4c/sigma3(-1) is put forward, which represents the crack tip radius independent of crack length under the action of the fatigue limit stress. According to the fatigue notch factor of the crack propagation, K(f) = K(t)2/3+n = (4d/rho*)1/3, the fatigue limits of sharp notch, long crack and short crack are calculated, which are very close to the measurements. The calculated results make it clear that for surface crack the transition point from long crack to short crack is a*=(DELTAK(th)3/12.8c)2, the range of physical short crack (a(s)) is P*14, less-than-or-equal-to a(s) less-than-or-equal-to a*, the threshold of the fatigue crack initiation is DELTAK(th)(i) = 0.66 DELTAsigma-1 (pirho*/4)1/2, the material parameter that indicates the fatigue crack sensitivity is rho*/a*, which represents the blunting condition of crack tip under the action of the fatigue limit stress.

Keyword :

INITIATING THRESHOLD SHORT CRACK FATIGUE NOTCH FACTOR FATIGUE LIMIT

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GB/T 7714 HU, ZZ , CAO, SZ . THEORETICAL-STUDY OF FATIGUE LIMIT FOR CRACK [J]. | SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY , 1993 , 36 (5) : 602-611 .
MLA HU, ZZ et al. "THEORETICAL-STUDY OF FATIGUE LIMIT FOR CRACK" . | SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY 36 . 5 (1993) : 602-611 .
APA HU, ZZ , CAO, SZ . THEORETICAL-STUDY OF FATIGUE LIMIT FOR CRACK . | SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY , 1993 , 36 (5) , 602-611 .
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THE VIRTUAL CONTACT LOADING METHOD FOR ELASTIC CONTACT PROBLEMS SCIE Scopus
期刊论文 | 1993 , 9 (6) , 455-461 | COMMUNICATIONS IN NUMERICAL METHODS IN ENGINEERING
WoS CC Cited Count: 6 SCOPUS Cited Count: 8
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Abstract :

The virtual contact loading method (VCLM), a highly efficient numerical method to solve elastic contact problems, is proposed in this paper. Having applied virtual loads on the possible contact region (PCR) of a structure system, we carried out the usual finite-element calculations only once and made a local iteration analysis in PCR then the contact region (shape and size), contact state (stick, slide or mixed), contact normal and shear stress distributions, and the stress and displacement fields in contact bodies were all obtained simultaneously. This method is very simple and easy to use. The elastic contact problems for cylinder-cylinder are solved in this paper and the results agree well with those in previous work.

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GB/T 7714 ZHAO, H , LI, ZH , KUANG, ZB . THE VIRTUAL CONTACT LOADING METHOD FOR ELASTIC CONTACT PROBLEMS [J]. | COMMUNICATIONS IN NUMERICAL METHODS IN ENGINEERING , 1993 , 9 (6) : 455-461 .
MLA ZHAO, H et al. "THE VIRTUAL CONTACT LOADING METHOD FOR ELASTIC CONTACT PROBLEMS" . | COMMUNICATIONS IN NUMERICAL METHODS IN ENGINEERING 9 . 6 (1993) : 455-461 .
APA ZHAO, H , LI, ZH , KUANG, ZB . THE VIRTUAL CONTACT LOADING METHOD FOR ELASTIC CONTACT PROBLEMS . | COMMUNICATIONS IN NUMERICAL METHODS IN ENGINEERING , 1993 , 9 (6) , 455-461 .
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A SPLITTING ITERATION METHOD FOR A SIMPLE CORANK-2 BIFURCATION PROBLEM SCIE CSCD
期刊论文 | 1993 , 11 (3) , 261-275 | JOURNAL OF COMPUTATIONAL MATHEMATICS
WoS CC Cited Count: 1
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A splitting iteration method is introduced to approximate a simple corank-2 bifurcation point of a nonlinear equation with small extended systems. This iteration method converges linearly with an adjustable speed and needs little extra computational work.

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GB/T 7714 LI, KT , MEI, Z . A SPLITTING ITERATION METHOD FOR A SIMPLE CORANK-2 BIFURCATION PROBLEM [J]. | JOURNAL OF COMPUTATIONAL MATHEMATICS , 1993 , 11 (3) : 261-275 .
MLA LI, KT et al. "A SPLITTING ITERATION METHOD FOR A SIMPLE CORANK-2 BIFURCATION PROBLEM" . | JOURNAL OF COMPUTATIONAL MATHEMATICS 11 . 3 (1993) : 261-275 .
APA LI, KT , MEI, Z . A SPLITTING ITERATION METHOD FOR A SIMPLE CORANK-2 BIFURCATION PROBLEM . | JOURNAL OF COMPUTATIONAL MATHEMATICS , 1993 , 11 (3) , 261-275 .
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NEW FRACTURE-TOUGHNESS PARAMETERS [J(DC) AND J(MC)] FOR ENGINEERING MATERIALS SCIE Scopus
期刊论文 | 1993 , 61 (4) , R63-R67 | INTERNATIONAL JOURNAL OF FRACTURE
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GB/T 7714 WANG, TJ . NEW FRACTURE-TOUGHNESS PARAMETERS [J(DC) AND J(MC)] FOR ENGINEERING MATERIALS [J]. | INTERNATIONAL JOURNAL OF FRACTURE , 1993 , 61 (4) : R63-R67 .
MLA WANG, TJ . "NEW FRACTURE-TOUGHNESS PARAMETERS [J(DC) AND J(MC)] FOR ENGINEERING MATERIALS" . | INTERNATIONAL JOURNAL OF FRACTURE 61 . 4 (1993) : R63-R67 .
APA WANG, TJ . NEW FRACTURE-TOUGHNESS PARAMETERS [J(DC) AND J(MC)] FOR ENGINEERING MATERIALS . | INTERNATIONAL JOURNAL OF FRACTURE , 1993 , 61 (4) , R63-R67 .
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CURVATURE CATERING - A NEW APPROACH IN MANUFACTURE OF SCULPTURED SURFACES .1. THEOREM SCIE Scopus
期刊论文 | 1993 , 38 (1-2) , 159-175 | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
WoS CC Cited Count: 21
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Abstract :

In this paper an innovative method for machining sculptured surfaces is presented. By using a disc cutter with a concave end instead of traditional ball-ended or drum-shaped tools, and by adjusting the cutter axis to move relatively to the component being machined according to some special rules during the cutter's passage through the surface, the envelope formed by the trace of the tool-nose in each step and the required surface have the same derivatives up to the third order in the plane normal to the feeding direction. As a result, the steps needed in the machining process can be greatly reduced as the same accuracy is ensured. A series of strict proofs of the theoretical foundation of the new method is presented in this first part of the paper, whilst some essential algorithms are to be discussed in the second part.

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GB/T 7714 WANG, XC , GHOSH, SK , LI, YB et al. CURVATURE CATERING - A NEW APPROACH IN MANUFACTURE OF SCULPTURED SURFACES .1. THEOREM [J]. | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 1993 , 38 (1-2) : 159-175 .
MLA WANG, XC et al. "CURVATURE CATERING - A NEW APPROACH IN MANUFACTURE OF SCULPTURED SURFACES .1. THEOREM" . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 38 . 1-2 (1993) : 159-175 .
APA WANG, XC , GHOSH, SK , LI, YB , WU, XT . CURVATURE CATERING - A NEW APPROACH IN MANUFACTURE OF SCULPTURED SURFACES .1. THEOREM . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 1993 , 38 (1-2) , 159-175 .
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