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< Page ,Total 215 >
RESTRAINING POPULATION-GROWTH IN 3 CHINESE VILLAGES, 1988-93 SSCI
期刊论文 | 1994 , 20 (2) , 365-395 | POPULATION AND DEVELOPMENT REVIEW
WoS CC Cited Count: 47
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Abstract :

The latest nationwide survey of Chinese fertility suggests that, after rising during the mid-1980s, fertility has fallen steadily since the late 1980s, reaching replacement level in 1992. Through a re-study of three villages in the northwestern province of Shaanxi, this article explores the politics and economics of this striking demographic development in a locality well known to the authors from previous research. Between 1988 and mid-1993, they find, village fertility fell to new lows due to increased emphasis on birth planning by leaders at all levels and, to a lesser extent, economic advance that reduced already very low childbearing aspirations. This microstudy of three ordinary Chinese villages provides dramatic testimony to the changes that can be wrought at the bottom of the administrative hierarchy when the top leadership decides that rapid population growth must be controlled.

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GB/T 7714 GREENHALGH, S , ZHU, CZ , LI, N . RESTRAINING POPULATION-GROWTH IN 3 CHINESE VILLAGES, 1988-93 [J]. | POPULATION AND DEVELOPMENT REVIEW , 1994 , 20 (2) : 365-395 .
MLA GREENHALGH, S 等. "RESTRAINING POPULATION-GROWTH IN 3 CHINESE VILLAGES, 1988-93" . | POPULATION AND DEVELOPMENT REVIEW 20 . 2 (1994) : 365-395 .
APA GREENHALGH, S , ZHU, CZ , LI, N . RESTRAINING POPULATION-GROWTH IN 3 CHINESE VILLAGES, 1988-93 . | POPULATION AND DEVELOPMENT REVIEW , 1994 , 20 (2) , 365-395 .
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DEVELOPMENT OF A HIGH-EFFICIENCY DOMESTIC REFRIGERATOR USING CFC SUBSTITUTES EI SCIE Scopus
期刊论文 | 1994 , 17 (3) , 205-208 | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
WoS CC Cited Count: 1
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Abstract :

Besides the values of the ozone depletion and global warming potentials, energy consumption is another important index to be considered in developing a refrigeration system using CFC substitutes. Many investigators have indicated that unless the original refrigeration system is correspondingly adjusted when using CFC substitutes, the energy efficiency ratio (EER) of the system will decrease. In this paper, the reasons for a decrease in EER are analysed theoretically, and some proposals for increasing EER are put forward. These proposals are used to develop a domestic refrigerator charged with a non-azeotropic mixture of HCFC22/HFC152a as the substitute for the original working fluid, CFC 1 2. The results show that the EER value of the refrigerator charged with this refrigerant mixture is increased by 6.5% compared with that of the same refrigerator charged with CFC12.

Keyword :

HOUSEHOLD REFRIGERATOR MIXTURE R12 REFRIGERATING MACHINE CFC EFFICIENCY R152A R22 SUBSTITUTE

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GB/T 7714 WU, Y , XIE, G , LI, XZ . DEVELOPMENT OF A HIGH-EFFICIENCY DOMESTIC REFRIGERATOR USING CFC SUBSTITUTES [J]. | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 1994 , 17 (3) : 205-208 .
MLA WU, Y 等. "DEVELOPMENT OF A HIGH-EFFICIENCY DOMESTIC REFRIGERATOR USING CFC SUBSTITUTES" . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 17 . 3 (1994) : 205-208 .
APA WU, Y , XIE, G , LI, XZ . DEVELOPMENT OF A HIGH-EFFICIENCY DOMESTIC REFRIGERATOR USING CFC SUBSTITUTES . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 1994 , 17 (3) , 205-208 .
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THE TRANSMISSION PROPERTIES OF STRATIFIED CHIROFERRITE MEDIA WITH OBLIQUELY INCIDENT PLANE-WAVE SCIE
期刊论文 | 1994 , 15 (3) , 593-603 | INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES
WoS CC Cited Count: 1
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Abstract :

A parameter study of electromagnetic wave propagating through the air-chiroferrite interface and through a chiroferrite slab is presented, and such bianisotropic medium can be made from chiral and gyrotropic ferrite materials artifically. The partial differential equations of the fourth order defining the field components E(y) and H(y) in chiroferrite are derived. The influence of different constitutive parameters on the transmission coefficients and refraction angles of transmitted fields are demonstrated. The results show that chirality causes strong effect of energy conversion between mode 1 and 2.

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GB/T 7714 YIN, WY , WANG, WB . THE TRANSMISSION PROPERTIES OF STRATIFIED CHIROFERRITE MEDIA WITH OBLIQUELY INCIDENT PLANE-WAVE [J]. | INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES , 1994 , 15 (3) : 593-603 .
MLA YIN, WY 等. "THE TRANSMISSION PROPERTIES OF STRATIFIED CHIROFERRITE MEDIA WITH OBLIQUELY INCIDENT PLANE-WAVE" . | INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES 15 . 3 (1994) : 593-603 .
APA YIN, WY , WANG, WB . THE TRANSMISSION PROPERTIES OF STRATIFIED CHIROFERRITE MEDIA WITH OBLIQUELY INCIDENT PLANE-WAVE . | INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES , 1994 , 15 (3) , 593-603 .
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SELECTIVE STIMULATION OF SMALLER FIBERS IN A COMPOUND NERVE TRUNK WITH SINGLE CATHODE BY RECTANGULAR CURRENT PULSES EI SCIE Scopus
期刊论文 | 1994 , 41 (3) , 286-291 | IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
WoS CC Cited Count: 33
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Abstract :

Electrical stimulation of unmyelinated nerve fibers is analyzed, using point sources in a simple volume conductor model and a dynamic Hodgkin-Huxley model of nerve fiber. The excitation and blocking threshold of single cathode stimulation with an indifference anode at infinity are calculated by solving difference equations with axons of different diameters. The relation between the blocking threshold and the pulsewidth of single cathode stimulation is also calculated. The results suggest a method of selectively stimulating the smaller fibers in a compound nerve trunk. Two kinds of stimulation electrodes are designed to test this method. Both of them are proven to yield results in accordance with our model by the animal experiments on a toad's sciatic nerve trunk. It is possible to excite the smaller fibers without exciting the larger ones in a compound nerve trunk by properly controlling the stimulus intensity. The method is likely to be used in both physiological experiments and neural prostheses.

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GB/T 7714 TAI, CF , JIANG, DZ . SELECTIVE STIMULATION OF SMALLER FIBERS IN A COMPOUND NERVE TRUNK WITH SINGLE CATHODE BY RECTANGULAR CURRENT PULSES [J]. | IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING , 1994 , 41 (3) : 286-291 .
MLA TAI, CF 等. "SELECTIVE STIMULATION OF SMALLER FIBERS IN A COMPOUND NERVE TRUNK WITH SINGLE CATHODE BY RECTANGULAR CURRENT PULSES" . | IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING 41 . 3 (1994) : 286-291 .
APA TAI, CF , JIANG, DZ . SELECTIVE STIMULATION OF SMALLER FIBERS IN A COMPOUND NERVE TRUNK WITH SINGLE CATHODE BY RECTANGULAR CURRENT PULSES . | IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING , 1994 , 41 (3) , 286-291 .
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STRESSES, DEFORMATIONS AND POROSITIES IN STANDARD FRACTURE SPECIMENS EI SCIE Scopus
期刊论文 | 1994 , 42 (2) , 497-507 | ACTA METALLURGICA ET MATERIALIA
WoS CC Cited Count: 9
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Abstract :

The stresses, deformations and porosities in vicinity of a blunting crack in different specimens were studied by a large-deformation finite element method. The presence and subsequent growth of smaller-scale voids were taken into account by using a modified Gurson model to describe the constitutive behavior of the material. The dependence of the stresses, deformations and porosities on specimen configurations was associated with the crack-tip constraint. The results showed that the constraint of different specimens was lower than that of the HRR singularity. The interaction between a crack and a hole in CT specimen was analyzed, and the results showed that the critical COD (crack tip opening displacement) was larger than that obtained in SSY model. The complete loss of the total carrying capacity in a ligament between the crack-tip and the hole was recommended as a crack initiation criterion.

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GB/T 7714 MA, FS , KUANG, ZB . STRESSES, DEFORMATIONS AND POROSITIES IN STANDARD FRACTURE SPECIMENS [J]. | ACTA METALLURGICA ET MATERIALIA , 1994 , 42 (2) : 497-507 .
MLA MA, FS 等. "STRESSES, DEFORMATIONS AND POROSITIES IN STANDARD FRACTURE SPECIMENS" . | ACTA METALLURGICA ET MATERIALIA 42 . 2 (1994) : 497-507 .
APA MA, FS , KUANG, ZB . STRESSES, DEFORMATIONS AND POROSITIES IN STANDARD FRACTURE SPECIMENS . | ACTA METALLURGICA ET MATERIALIA , 1994 , 42 (2) , 497-507 .
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TASK DECOMPOSITION AND ALLOCATION PROBLEMS AND DISCRETE-EVENT SYSTEMS SCIE Scopus
期刊论文 | 1994 , 30 (2) , 203-216 | AUTOMATICA
WoS CC Cited Count: 8
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Abstract :

The decomposition of tasks and the problems of allocating them to humans and machines in complex systems is discussed from three perspectives: systems engineering as manifested in the design of flexible manufacturing systems, organization design as applied to decision-making teams that monitor and control engineering systems, and cognitive ergonomics. The limitations of fixed task allocations are discussed and the case is made for integrated experimental and theoretical investigations that address the dynamic aspects of task allocation.

Keyword :

ERGONOMICS, HUMAN MACHINE SYSTEMS PETRI NETS TASK ALLOCATION DISCRETE EVENT SYSTEMS FLEXIBLE MANUFACTURING SYSTEMS

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GB/T 7714 LEVIS, AH , MORAY, N , HU, BS . TASK DECOMPOSITION AND ALLOCATION PROBLEMS AND DISCRETE-EVENT SYSTEMS [J]. | AUTOMATICA , 1994 , 30 (2) : 203-216 .
MLA LEVIS, AH 等. "TASK DECOMPOSITION AND ALLOCATION PROBLEMS AND DISCRETE-EVENT SYSTEMS" . | AUTOMATICA 30 . 2 (1994) : 203-216 .
APA LEVIS, AH , MORAY, N , HU, BS . TASK DECOMPOSITION AND ALLOCATION PROBLEMS AND DISCRETE-EVENT SYSTEMS . | AUTOMATICA , 1994 , 30 (2) , 203-216 .
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IMPROVED CRACK-TIP OPENING DISPLACEMENT FRACTURE-TOUGHNESS PARAMETERS DELTA(DC) AND DELTA(MC) FOR ENGINEERING MATERIALS AND ASSOCIATED CRITERIA FOR DUCTILE FRACTURE SCIE
期刊论文 | 1994 , 65 (3) , R49-R52 | INTERNATIONAL JOURNAL OF FRACTURE
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GB/T 7714 WANG, TJ , FENG, GM . IMPROVED CRACK-TIP OPENING DISPLACEMENT FRACTURE-TOUGHNESS PARAMETERS DELTA(DC) AND DELTA(MC) FOR ENGINEERING MATERIALS AND ASSOCIATED CRITERIA FOR DUCTILE FRACTURE [J]. | INTERNATIONAL JOURNAL OF FRACTURE , 1994 , 65 (3) : R49-R52 .
MLA WANG, TJ 等. "IMPROVED CRACK-TIP OPENING DISPLACEMENT FRACTURE-TOUGHNESS PARAMETERS DELTA(DC) AND DELTA(MC) FOR ENGINEERING MATERIALS AND ASSOCIATED CRITERIA FOR DUCTILE FRACTURE" . | INTERNATIONAL JOURNAL OF FRACTURE 65 . 3 (1994) : R49-R52 .
APA WANG, TJ , FENG, GM . IMPROVED CRACK-TIP OPENING DISPLACEMENT FRACTURE-TOUGHNESS PARAMETERS DELTA(DC) AND DELTA(MC) FOR ENGINEERING MATERIALS AND ASSOCIATED CRITERIA FOR DUCTILE FRACTURE . | INTERNATIONAL JOURNAL OF FRACTURE , 1994 , 65 (3) , R49-R52 .
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GAUGE TRANSFORMATION APPROACH TO THE EXACT SOLUTION OF A GENERALIZED HARMONIC-OSCILLATOR SCIE
期刊论文 | 1994 , 27 (3) , 985-992 | JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
WoS CC Cited Count: 43
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Abstract :

The exact solution and the invariant operator of a generalized harmonic oscillator are obtained by performing three consecutive gauge transformations on the time-dependent Schrodinger equation. In contrast to previous results, they depend only on solutions of a linear differential equation for the associated classical harmonic oscillator. Non-adiabatic and adiabatic Berry phases for the system are calculated on the basis of the exact solution.

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GB/T 7714 LI, FL , WANG, SJ , WEIGUNY, A et al. GAUGE TRANSFORMATION APPROACH TO THE EXACT SOLUTION OF A GENERALIZED HARMONIC-OSCILLATOR [J]. | JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL , 1994 , 27 (3) : 985-992 .
MLA LI, FL et al. "GAUGE TRANSFORMATION APPROACH TO THE EXACT SOLUTION OF A GENERALIZED HARMONIC-OSCILLATOR" . | JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL 27 . 3 (1994) : 985-992 .
APA LI, FL , WANG, SJ , WEIGUNY, A , LIN, DL . GAUGE TRANSFORMATION APPROACH TO THE EXACT SOLUTION OF A GENERALIZED HARMONIC-OSCILLATOR . | JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL , 1994 , 27 (3) , 985-992 .
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DISCHARGE MECHANISM OF THE KYOTO-UNIVERSITY-TYPE MICROWAVE PLASMA CATHODE OR MICROWAVE ION-SOURCE SCIE Scopus
会议论文 | 1994 , 65 (4) , 1127-1128 | 5th International Conference on Ion Sources
WoS CC Cited Count: 1
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Abstract :

In this paper the discharge mechanism of the Kyoto University-type microwave plasma cathode is studied. The relationship between the electron-absorbed power p(e) and electron impact frequency gamma(c) is obtained. When B = 875 G, p(e) decreases with the increment of gamma(c). At the same time when gamma(c) --> 0 or gamma(c) much less than omega, electron cyclotron resonance (ECR) discharge will be set up. When B > 875 G and gamma(c) = 10(7)-10(-8) s-1, the off-resonance discharge exists. With gamma(c) increased up to a certain limit, it follows that when omega(z)/gamma=omega = (2 x 3(-1/2))1/2omega, a new type of discharge, the so-called double resonance (DR) discharge, occurs. For the Kyoto University-type MPC or MIS, the off-resonance discharge and DR discharge can be satisfied and it is verified by experiment.

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GB/T 7714 RAO, YS , WU, JN , YAN, YH et al. DISCHARGE MECHANISM OF THE KYOTO-UNIVERSITY-TYPE MICROWAVE PLASMA CATHODE OR MICROWAVE ION-SOURCE [C] . 1994 : 1127-1128 .
MLA RAO, YS et al. "DISCHARGE MECHANISM OF THE KYOTO-UNIVERSITY-TYPE MICROWAVE PLASMA CATHODE OR MICROWAVE ION-SOURCE" . (1994) : 1127-1128 .
APA RAO, YS , WU, JN , YAN, YH , ZHANG, Y , QI, L . DISCHARGE MECHANISM OF THE KYOTO-UNIVERSITY-TYPE MICROWAVE PLASMA CATHODE OR MICROWAVE ION-SOURCE . (1994) : 1127-1128 .
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RADIATION CHARACTERISTICS OF DIPOLE ANTENNA IN A GROUNDED COMPOSITE MAGNETIZED SEMICONDUCTOR PLASMA SCIE Scopus
期刊论文 | 1994 , 15 (2) , 465-472 | INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES
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The radiation characteristics of dipole antenna in a grounded nonreciprocal semiconductor plasma are examined using the spectral domain-exponential matrix technique, and such solid plasma is taken as GaAs material. The effects of constitutive and geometrical parameters of the semiconductor plasma on the radiation patterns are demonstrated in detail, and the results show that the far-field behaviour of dipole antenna can be changed hy adjusting both the operating frequency and the applied magnetic field, et al.

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GB/T 7714 YIN, WY , WANG, WB . RADIATION CHARACTERISTICS OF DIPOLE ANTENNA IN A GROUNDED COMPOSITE MAGNETIZED SEMICONDUCTOR PLASMA [J]. | INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES , 1994 , 15 (2) : 465-472 .
MLA YIN, WY et al. "RADIATION CHARACTERISTICS OF DIPOLE ANTENNA IN A GROUNDED COMPOSITE MAGNETIZED SEMICONDUCTOR PLASMA" . | INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES 15 . 2 (1994) : 465-472 .
APA YIN, WY , WANG, WB . RADIATION CHARACTERISTICS OF DIPOLE ANTENNA IN A GROUNDED COMPOSITE MAGNETIZED SEMICONDUCTOR PLASMA . | INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES , 1994 , 15 (2) , 465-472 .
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