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< Page ,Total 242 >
HIGH SEX-RATIOS IN CHINA FUTURE SSCI SCIE
期刊论文 | 1995 , 267 (5199) , 874-876 | SCIENCE
WoS CC Cited Count: 78
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Abstract :

In China in recent years, male live births have exceeded those of females by amounts far greater than those that occur naturally in human populations, a trend with significant demographic consequences. The resulting imbalance in the first-marriage market is estimated to be about 1 million males per year after 2010. These ''excess'' males were not easily accommodated in models with substantial changes in first-marriage patterns, The current sex ratio at birth has little effect on a couple's probability of having at least one son, so future increases in the sex ratio may well occur, especially given increasing access to sex-selective abortion.

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GB/T 7714 TULJAPURKAR, S , LI, N , FELDMAN, MW . HIGH SEX-RATIOS IN CHINA FUTURE [J]. | SCIENCE , 1995 , 267 (5199) : 874-876 .
MLA TULJAPURKAR, S 等. "HIGH SEX-RATIOS IN CHINA FUTURE" . | SCIENCE 267 . 5199 (1995) : 874-876 .
APA TULJAPURKAR, S , LI, N , FELDMAN, MW . HIGH SEX-RATIOS IN CHINA FUTURE . | SCIENCE , 1995 , 267 (5199) , 874-876 .
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ELIMINATION OF THE EFFECTS OF GEOMETRY ON FRACTURE-TOUGHNESS BY CONTINUOUS DAMAGE SCIE
期刊论文 | 1995 , 14 (3) , 473-490 | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
WoS CC Cited Count: 1
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Abstract :

Detailed crack tip stress and strain fields are generated for different plane strain fracture specimens. These fields are matched approximately by a tri-parameter characterization of (J, Q, k) in the microstructurally significant region of ductile material. Continuous damage mechanics and the crack tip field of (J, Q, a) are used to quantify constraints in different fracture speciemens and the effect of specimen configuration on the onset of crack growth. The relationships between the theoretical fracture toughness J(c)(HRR) (critical J integral value in HRR field) and the integral values of J in actual specimens are established by an assumption that fracture initiation occurs at the same damage values in both specimens and HRR field. An application to experimental data is explored in this paper.

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GB/T 7714 MA, F , KUANG, ZB . ELIMINATION OF THE EFFECTS OF GEOMETRY ON FRACTURE-TOUGHNESS BY CONTINUOUS DAMAGE [J]. | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS , 1995 , 14 (3) : 473-490 .
MLA MA, F 等. "ELIMINATION OF THE EFFECTS OF GEOMETRY ON FRACTURE-TOUGHNESS BY CONTINUOUS DAMAGE" . | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS 14 . 3 (1995) : 473-490 .
APA MA, F , KUANG, ZB . ELIMINATION OF THE EFFECTS OF GEOMETRY ON FRACTURE-TOUGHNESS BY CONTINUOUS DAMAGE . | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS , 1995 , 14 (3) , 473-490 .
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A NEW METHOD TO DEAGGLOMERATION OF PBTIO3 ULTRAFINE POWDERS SCIE Scopus
期刊论文 | 1995 , 19 (3-4) , 95-100 | FERROELECTRICS LETTERS SECTION
WoS CC Cited Count: 1
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Abstract :

An innovative method for deagglomeration of ultrafine powders was developed in this paper. The method was based on electrohydraulic forces produced by electric breakdown discharge between two electrodes submerged in liquid. By controlling the process parameters (voltage, electrode separation and reaction time), PbTiO3 ultrafine powders with spherical, tabular and aciculate shape were successfully deagglomerated. Two ways based on centrifugal sedimentation and laserlight scattering were used to determine the particle size distribution. Scanning electron microscope (SEM) images showed that the agglomeration of PT powders was greatly reduced.

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GB/T 7714 WANG, SS , LIU, HL , ZHANG, LY et al. A NEW METHOD TO DEAGGLOMERATION OF PBTIO3 ULTRAFINE POWDERS [J]. | FERROELECTRICS LETTERS SECTION , 1995 , 19 (3-4) : 95-100 .
MLA WANG, SS et al. "A NEW METHOD TO DEAGGLOMERATION OF PBTIO3 ULTRAFINE POWDERS" . | FERROELECTRICS LETTERS SECTION 19 . 3-4 (1995) : 95-100 .
APA WANG, SS , LIU, HL , ZHANG, LY , YAO, X . A NEW METHOD TO DEAGGLOMERATION OF PBTIO3 ULTRAFINE POWDERS . | FERROELECTRICS LETTERS SECTION , 1995 , 19 (3-4) , 95-100 .
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CHARACTERIZATION OF PBTIO3 CRYSTALLITES IN-SITU CONFINED GROWN IN AMORPHORS SILICA SCIE
期刊论文 | 1995 , 19 (3-4) , 113-117 | FERROELECTRICS LETTERS SECTION
WoS CC Cited Count: 3
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Abstract :

PbO-TiO2-SiO2 glass-ceramic with PT crystallites in-situ confined grown from silica matrix has been synthesized by sol-gel method. Crystallization process of PT crystallites is studied by XRD and DTA. From XRD data it has been found that the c axis length and cia ratio of PT tetragonal structure decrease obviously with increase of silica content. The phase transition temperature of PbTiO3 nanocrystallites from tetragonal to cubic and the transition latent heat all decrease dramatically. The strain and crystal size of the confined grown PT crystallites are calculated by the method of Wilson and Scherrer respectively. The special confined environment where crystal grains grow and the size effect are thought to be the reason of the feature of the PbTiO3 in silica.

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GB/T 7714 YAO, K , ZHANG, LY , YAO, X . CHARACTERIZATION OF PBTIO3 CRYSTALLITES IN-SITU CONFINED GROWN IN AMORPHORS SILICA [J]. | FERROELECTRICS LETTERS SECTION , 1995 , 19 (3-4) : 113-117 .
MLA YAO, K et al. "CHARACTERIZATION OF PBTIO3 CRYSTALLITES IN-SITU CONFINED GROWN IN AMORPHORS SILICA" . | FERROELECTRICS LETTERS SECTION 19 . 3-4 (1995) : 113-117 .
APA YAO, K , ZHANG, LY , YAO, X . CHARACTERIZATION OF PBTIO3 CRYSTALLITES IN-SITU CONFINED GROWN IN AMORPHORS SILICA . | FERROELECTRICS LETTERS SECTION , 1995 , 19 (3-4) , 113-117 .
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PORE-SIZE CONTROL OF POROUS SILICA BY SOL-GEL PROCESS EI SCIE Scopus
期刊论文 | 1995 , 19 (3-4) , 89-94 | FERROELECTRICS LETTERS SECTION
WoS CC Cited Count: 7
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Abstract :

Porous silica glass was prepared by sol-gel process from tetraethoxysilane (TEOS). The effects of solvents (water, ethanol), drying condition, heat treatment temperature on specific surface area and pore size distribution of porous silica were investigated. Gelation process accelerates with an increase of H2O content, while retards with the increase of ethanol amount. Structure changes during heat treatment were studied by means of DTA, XRD. TEM micrographs show that the gel particles shrink after heated at 500 degrees C, thus the average pore size decreases.

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GB/T 7714 WANG, SS , LIU, HL , ZHANG, LY et al. PORE-SIZE CONTROL OF POROUS SILICA BY SOL-GEL PROCESS [J]. | FERROELECTRICS LETTERS SECTION , 1995 , 19 (3-4) : 89-94 .
MLA WANG, SS et al. "PORE-SIZE CONTROL OF POROUS SILICA BY SOL-GEL PROCESS" . | FERROELECTRICS LETTERS SECTION 19 . 3-4 (1995) : 89-94 .
APA WANG, SS , LIU, HL , ZHANG, LY , YAO, X . PORE-SIZE CONTROL OF POROUS SILICA BY SOL-GEL PROCESS . | FERROELECTRICS LETTERS SECTION , 1995 , 19 (3-4) , 89-94 .
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THE PROGNOSIS OF VIBRATION CONDITION FOR A 200-MW TURBOGENERATOR SET USING ARTIFICIAL NEURAL-NETWORK SCIE
期刊论文 | 1995 , 37 (1) , 21-24 | INSIGHT
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Abstract :

The prognosis of vibration condition for a turbo-generator set using artificial neural networks is introduced in this paper. Its effectiveness is compared with the traditional prediction method using auto-regressive (AR) model. Moreover, a synthetical prediction method based on multi-factor inputs is presented. The results indicate that the accuracy of prognosis using neural networks in higher and more effective.

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GB/T 7714 PEI, SY , LI, X , QU, LS . THE PROGNOSIS OF VIBRATION CONDITION FOR A 200-MW TURBOGENERATOR SET USING ARTIFICIAL NEURAL-NETWORK [J]. | INSIGHT , 1995 , 37 (1) : 21-24 .
MLA PEI, SY et al. "THE PROGNOSIS OF VIBRATION CONDITION FOR A 200-MW TURBOGENERATOR SET USING ARTIFICIAL NEURAL-NETWORK" . | INSIGHT 37 . 1 (1995) : 21-24 .
APA PEI, SY , LI, X , QU, LS . THE PROGNOSIS OF VIBRATION CONDITION FOR A 200-MW TURBOGENERATOR SET USING ARTIFICIAL NEURAL-NETWORK . | INSIGHT , 1995 , 37 (1) , 21-24 .
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PYROELECTRIC PROPERTIES OF PLT THIN-FILMS EI SCIE Scopus
期刊论文 | 1995 , 19 (3-4) , 107-112 | FERROELECTRICS LETTERS SECTION
WoS CC Cited Count: 2
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Abstract :

Pyroelectric properties of PLT thin films prepared by MOD method are characterized. Dynamic pyroelectric responses of the films measured with Chynoweth method are presented. Pyroelectric responses of point and quadruple pyroelectric detectors using PLT20 thin films are measured. One-dimensional heat conduction model is used to analyze the properties of the detectors. requirements to the PLT films used for pyroelectric detectors are proposed.

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GB/T 7714 LIU, WG , LIU, Y , ZHANG, LY et al. PYROELECTRIC PROPERTIES OF PLT THIN-FILMS [J]. | FERROELECTRICS LETTERS SECTION , 1995 , 19 (3-4) : 107-112 .
MLA LIU, WG et al. "PYROELECTRIC PROPERTIES OF PLT THIN-FILMS" . | FERROELECTRICS LETTERS SECTION 19 . 3-4 (1995) : 107-112 .
APA LIU, WG , LIU, Y , ZHANG, LY , YAO, X . PYROELECTRIC PROPERTIES OF PLT THIN-FILMS . | FERROELECTRICS LETTERS SECTION , 1995 , 19 (3-4) , 107-112 .
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Macrocrack interacting with microcrack on the interface SCIE Scopus
期刊论文 | 1995 , 73 (4) , R71-R77 | INTERNATIONAL JOURNAL OF FRACTURE
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GB/T 7714 Gao, S , Wang, XM , Shen, YP . Macrocrack interacting with microcrack on the interface [J]. | INTERNATIONAL JOURNAL OF FRACTURE , 1995 , 73 (4) : R71-R77 .
MLA Gao, S et al. "Macrocrack interacting with microcrack on the interface" . | INTERNATIONAL JOURNAL OF FRACTURE 73 . 4 (1995) : R71-R77 .
APA Gao, S , Wang, XM , Shen, YP . Macrocrack interacting with microcrack on the interface . | INTERNATIONAL JOURNAL OF FRACTURE , 1995 , 73 (4) , R71-R77 .
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STUDY OF BAND-GAP NARROWING EFFECT AND NONRADIATIVE RECOMBINATION CENTERS FOR HEAVILY C-DOPED GAAS BY PHOTOLUMINESCENCE SPECTROSCOPY SCIE Scopus
期刊论文 | 1995 , 77 (9) , 4822-4824 | JOURNAL OF APPLIED PHYSICS
WoS CC Cited Count: 7
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GB/T 7714 YAN, BP , LUO, JS , ZHANG, QL . STUDY OF BAND-GAP NARROWING EFFECT AND NONRADIATIVE RECOMBINATION CENTERS FOR HEAVILY C-DOPED GAAS BY PHOTOLUMINESCENCE SPECTROSCOPY [J]. | JOURNAL OF APPLIED PHYSICS , 1995 , 77 (9) : 4822-4824 .
MLA YAN, BP et al. "STUDY OF BAND-GAP NARROWING EFFECT AND NONRADIATIVE RECOMBINATION CENTERS FOR HEAVILY C-DOPED GAAS BY PHOTOLUMINESCENCE SPECTROSCOPY" . | JOURNAL OF APPLIED PHYSICS 77 . 9 (1995) : 4822-4824 .
APA YAN, BP , LUO, JS , ZHANG, QL . STUDY OF BAND-GAP NARROWING EFFECT AND NONRADIATIVE RECOMBINATION CENTERS FOR HEAVILY C-DOPED GAAS BY PHOTOLUMINESCENCE SPECTROSCOPY . | JOURNAL OF APPLIED PHYSICS , 1995 , 77 (9) , 4822-4824 .
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NONLINEAR APPROXIMATION METHOD IN LAGRANGIAN RELAXATION-BASED ALGORITHMS FOR HYDROTHERMAL SCHEDULING SCIE
会议论文 | 1995 , 10 (2) , 772-778 | 1994 IEEE/PES Summer Meeting
WoS CC Cited Count: 78
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Abstract :

When the Lagrangian relaxation technique is used to solve hydrothermal scheduling problems, many subproblems have linear stage-wise cost functions. A well recognized difficulty is that the solutions to these subproblems may oscillate between maximum and minimum generations with slight changes of the multipliers. Furthermore, the subproblem solutions may become singular, i.e., they are un-determined when the linear coefficients become zero. This may result in large differences between subproblem solutions and the optimal primal schedule. In this paper, a nonlinear approximation method is presented which utilizes nonlinear functions, quadratic in this case, to approximate relevant linear cost functions. The analysis shows that the difficulty associated with solution oscillation is reduced, and singularity is avoided. Extensive testing based on Northeast Utilities data indicates that the method consistently generates better schedules than the standard Lagrangian relaxation method.

Keyword :

HYDROTHERMAL COORDINATION POWER SYSTEM SCHEDULING UNIT COMMITMENT LAGRANGIAN RELAXATION

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GB/T 7714 GUAN, XH , LUH, PB , ZHANG, L . NONLINEAR APPROXIMATION METHOD IN LAGRANGIAN RELAXATION-BASED ALGORITHMS FOR HYDROTHERMAL SCHEDULING [C] . 1995 : 772-778 .
MLA GUAN, XH et al. "NONLINEAR APPROXIMATION METHOD IN LAGRANGIAN RELAXATION-BASED ALGORITHMS FOR HYDROTHERMAL SCHEDULING" . (1995) : 772-778 .
APA GUAN, XH , LUH, PB , ZHANG, L . NONLINEAR APPROXIMATION METHOD IN LAGRANGIAN RELAXATION-BASED ALGORITHMS FOR HYDROTHERMAL SCHEDULING . (1995) : 772-778 .
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