144 Result(s)

Article

The influence of a net charge on the critical mass of a neutron star

We derived the set of equations determining the structure of a spherically symmetric charged star within the framework of general relativity (modified Oppenhiemer-Volkoff equations). The equations have been so...

J. L. Zhang, W. Y. Chau, T. Y. Deng in Astrophysics and Space Science (1982)

Article

Static structure of general-relativistic degenerate configurations: Effects of a core

Models of spherically-symmetric static systems made up of self-gravitating, completely degenerate neutral fermions containing a core are constructed within the framework of general relativity and the effects o...

J. L. Zhang, W. Y. Chau, Kayll Lake, J. Stone in Astrophysics and Space Science (1983)

Article

Profiles of spectral lines of an accretion ring around a Kerr black hole

Profiles of spectral lines emitted from an accretion ring around an object with strong gravitational field should be affected by Doppler shift, gravitational redshift, and deflection of light. Taking these eff...

J. L. Zhang, S. P. **ang, J. F. Lu in Astrophysics and Space Science (1985)

Article

Electrical conduction in sintered Cd₂Sb₂O₇ pyrochlore

B. R. Li, J. L. Zhang in Journal of Materials Science Letters (1990)

Article

Important factors affecting J _c in bulk YBa₂Cu₃O₇ − δ

The relationship between the transport J _c and the microstructure of the bulk YBa₂Cu₃O_7−03B4; samples prepared in various sintering conditions has been studied. The results show that the oxygen atmosphere during ...

H. S. Wang, C. G. Cui, S. L. Li, J. L. Zhang, Y. Lu… in Journal of Materials Science (1991)

Article

Important factors affectingJ _c in bulk YBa₂Cu₃O₇ − δ

The relationship between the transportJ _c and the microstructure of the bulk YBa₂Cu₃O_7−03B4; samples prepared in various sintering conditions has been studied. The results show that the oxygen atmosphere during s...

H. S. Wang, C. G. Cui, S. L. Li, J. L. Zhang, Y. Lu… in Journal of Materials Science (1991)

Article

Electrical conduction of Ba_0.5Sr_0.5TiO₃ ceramics under d.c. voltage

J. L. Zhang in Journal of Materials Science Letters (1992)

Article

Obliquity and magnetic dipole radiation from collapsing, rotating, magnetized stars

We consider in this paper the evolution of a collapsing (or exploding), uniformly rotating, uniformly magnetized spheroidal star with non-aligned rotational and magnetic axes. Analytical expressions were obtai...

W. Y. Chau, J. L. Zhang in Astrophysics and Space Science (1992)

Article

An improvement on the digital redesign method based on the block-pulse function approximation

This paper proposes an effective method to improve the digital redesign method via the block-pulse function approach. The coefficients of the block-pulse function expansion are exactly evaluated such that the ...

J. S. H. Tsai, L. S. Shieh, J. L. Zhang in Circuits, Systems and Signal Processing (1993)

Article

BaZrO₃ and BaHfO₃: preparation, properties and compatibility with YBa₂Cu₃O_7-x

Single-phase BaZrO₃ and BaHfO₃ polycrystalline powders were prepared by solid-state reaction and by spray-drying methods. BaHfO₃ ceramic was fabricated at 1300°C for 24 h after pre-sintering HfO₂ and BaCO₃ powder...

J. L. Zhang, J. E. Evetts in Journal of Materials Science (1994)

Article

Superconducting behavior of high-T _c YBa₂Cu₃O₇ thin films with BaO impurity produced by pulsed laser deposition

We have investigated the superconducting behavior of high-T _c YBa₂Cu₃O₇ (YBCO) thin films containing BaO impure phase produced by pulsed laser deposition. The thin films were characterized by the standard four-pr...

S. F. Xu, Y. J. Tian, H. B. Lu, Z. H. Chen, D. F. Cui… in Journal of Superconductivity (1994)

Chapter and Conference Paper

Phase Transition in Rotating Hybrid Stars

Spin down of an isolated pulsar might cause a phase transition of quark deconfinement in its core, and which leads to drastic decrease of the stellar moment of inertia, and even results in an era of spin-up of...

Y. F. Yuan, K. S. Cheng, J. L. Zhang in Stellar Astrophysics — A Tribute to Helmut A. Abt (2003)

Article

Bioremediation of Organophosphate Pollutants by a Genetically-Engineered Enzyme

Ch.-L. Qiao, J. Huang, X. Li, B.-Ch. Shen… in Bulletin of Environmental Contamination an… (2003)

Article

Sequential Penalty Algorithm for Nonlinear Constrained Optimization

In this paper, a new sequential penalty algorithm, based on the L_infin exact penalty function, is proposed for a general nonlinear constrained optimization problem. The algorithm has the following characteristics...

J.L. Zhang, X.S. Zhang in Journal of Optimization Theory and Applications (2003)

Article

Photosynthetic Characteristics, Dark Respiration, and Leaf Mass Per Unit Area in Seedlings of Four Tropical Tree Species Grown Under Three Irradiances

We investigated the effect of growth irradiance (I) on photon-saturated photosynthetic rate (P _max), dark respiration rate (R _D), carboxylation efficiency (CE), and leaf mass per unit area (LMA) in seedlings of t...

Y.-L. Feng, K.-F. Cao, J.-L. Zhang in Photosynthetica (2004)

Article

Impact of Douglas-fir and Scots pine seedlings on plagioclase weathering under acidic conditions

The weathering of soil minerals in forest ecosystems increases nutrient availability for the trees. The rate of such weathering and its relative contribution to forest tree nutrition, is a major issue when eva...

M. R. Bakker, E. George, M. -P. Turpault, J. L. Zhang, B. Zeller in Plant and Soil (2005)

Article

Diagnosis of OH Radical by Optical Emission Spectroscopy in Atmospheric Pressure Unsaturated Humid Air Corona Discharge and its Implication to Desulphurization of Flue Gas

OH radical in the corona discharge with pipe–nozzle–plate electrode has been diagnosed by optical emission spectroscopy. Spatial variations of OH radical emission in discharge gap have been measured. Relative ...

M. Sun, Y. Wu, J. Li, N. H. Wang, J. Wu… in Plasma Chemistry and Plasma Processing (2005)

Article

Effect of ethanol on the aggregation properties of cetyltrimethylammonium bromide surfactant

Surfactant aggregation properties in aqueous and mixed organic/aqueous solutions have attracted considerable interests especially for the applications to the template synthesis of nanoporous inorganic material...

W. Li, Y.-C. Han, J.-L. Zhang, B.-G. Wang in Colloid Journal (2005)

Article

Human hepatitis B virus X protein promotes cell proliferation and inhibits cell apoptosis through interacting with a serine protease Hepsin

The X protein of human hepatitis B virus (HBV) acts as an indirect transcriptional transactivator to regulate the expression of many viral and cellular genes as well as playing a critical role in the developme...

J.-L. Zhang, W.-G. Zhao, K.-L. Wu, K. Wang, X. Zhang, C.-F. Gu… in Archives of Virology (2005)

Article

Superlinearly Convergent Trust-Region Method without the Assumption of Positive-Definite Hessian

In this paper, we reinvestigate the trust-region method by reformulating its subproblem: the trust-region radius is guided by gradient information at the current iteration and is self-adaptively adjusted. A tr...

J. L. Zhang, Y. Wang PhD Candidate… in Journal of Optimization Theory and Applica… (2006)