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Search Results: 1 - 10 of 48199 matches for " Bin Zhou "
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Measuring the Entropy and Testing the Second Law of Thermodynamics
Bin Zhou
Physics , 2002,
Abstract: Evidence implies that basic laws of thermodynamics must be tested by experiments. In this paper, an experiment is designed to measure the entropy of a system with at least one known (measurable) equation of state, especially the gas systems. Since the entropy can be measured now, the formulae related to the second law of thermodynamics can be examined by other experiments.
How and in What Sense Can the Entropy Be Measured?
Bin Zhou
Physics , 2002,
Abstract: In this paper, a method of measuring the entropy is presented. Problems related to the entropy and the heat are also discussed.
Global Structure of Certain Static Spacetimes (I)
Bin Zhou
Physics , 2001,
Abstract: In this paper, static spacetimes with a topological structure of R^2 \times N is studied, where N is an arbitrary manifold. Well known Schwarzschild spacetime and Reissner-Nordstrom spacetime are special cases. It is shown that the existence of a constant and positive surface gravity $\kappa$ ensures the existence of the Killing horizon, with the cross section homeomorphic to N.
The first boundary value problem for Abreu's equation
Bin Zhou
Mathematics , 2010,
Abstract: In this paper we prove the existence and regularity of solutions to the first boundary value problem for Abreu's equation, which is a fourth order nonlinear partial differential equation closely related to the Monge-Ampere equation. The first boundary value problem can be formulated as a variational problem for the energy functional. The existence and uniqueness of maximizers can be obtained by the concavity of the functional. The main ingredients of the paper are the a priori estimates and an approximation result, which enable us to prove that the maximizer is smooth in dimension 2.
Stability Analysis of Nonlinear Time-Varying Systems by Lyapunov Functions with Indefinite Derivatives
Bin Zhou
Mathematics , 2015,
Abstract: This paper is concerned with stability analysis of nonlinear time-varying systems by using Lyapunov function based approach. The classical Lyapunov stability theorems are generalized in the sense that the time-derivative of the Lyapunov functions are allowed to be indefinite. The stability analysis is accomplished with the help of the scalar stable functions introduced in our previous study. Both asymptotic stability and input-to-state stability are considered. Particularly, for asymptotic stability, several concepts such as uniform and non-uniform asymptotic stability, and uniform and non-uniform exponential stability are studied. The effectiveness of the proposed theorems is illustrated by several numerical examples.
On Stability of the Linearized Spacecraft Attitude Control System
Bin Zhou
Mathematics , 2015,
Abstract: This note is concerned with the stability and stabilization of the linearized spacecraft attitude control system. Necessary and sufficient conditions are respectively provided to guarantee that the considered systems are polynomially stable and stable in the Lyapunov sense. These two classes of conditions guarantee that the linearized spacecraft attitude control system can be respectively stabilized semi-globally and globally by saturated linear state feedback.
Analysis of Intervention Strategies for Inhalation Exposure to Polycyclic Aromatic Hydrocarbons and Associated Lung Cancer Risk Based on a Monte Carlo Population Exposure Assessment Model
Bin Zhou, Bin Zhao
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0085676
Abstract: It is difficult to evaluate and compare interventions for reducing exposure to air pollutants, including polycyclic aromatic hydrocarbons (PAHs), a widely found air pollutant in both indoor and outdoor air. This study presents the first application of the Monte Carlo population exposure assessment model to quantify the effects of different intervention strategies on inhalation exposure to PAHs and the associated lung cancer risk. The method was applied to the population in Beijing, China, in the year 2006. Several intervention strategies were designed and studied, including atmospheric cleaning, smoking prohibition indoors, use of clean fuel for cooking, enhancing ventilation while cooking and use of indoor cleaners. Their performances were quantified by population attributable fraction (PAF) and potential impact fraction (PIF) of lung cancer risk, and the changes in indoor PAH concentrations and annual inhalation doses were also calculated and compared. The results showed that atmospheric cleaning and use of indoor cleaners were the two most effective interventions. The sensitivity analysis showed that several input parameters had major influence on the modeled PAH inhalation exposure and the rankings of different interventions. The ranking was reasonably robust for the remaining majority of parameters. The method itself can be extended to other pollutants and in different places. It enables the quantitative comparison of different intervention strategies and would benefit intervention design and relevant policy making.
Signal Classification Method Based on Support Vector Machine and High-Order Cumulants  [PDF]
Xin ZHOU, Ying WU, Bin YANG
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.21007
Abstract: In this paper, a classification method based on Support Vector Machine (SVM) is given in the digital modulation signal classification. The second, fourth and sixth order cumulants of the received signals are used as classification vectors firstly, then the kernel thought is used to map the feature vector to the high dimensional feature space and the optimum separating hyperplane is constructed in space to realize signal recognition. In order to build an effective and robust SVM classifier, the radial basis kernel function is selected, one against one or one against rest of multi-class classifier is designed, and method of parameter selection using cross- validation grid is adopted. Through the experiments it can be concluded that the classifier based on SVM has high performance and is more robust.
Study on brain protection of mild hypothermia in cardiopulmonary resuscitation
J BingWen, Zhou Bin
Critical Care , 1997, DOI: 10.1186/cc10
Abstract: (i) The SOD levels in blood and CSF after resuscitation were lower than those before CA (P < 0.01), the LPO and LA levels in blood and CSF were significantly higher than those before CA (P < 0.01). (ii) The SOD level in CSF in mild hypothermia group was higher than that in normothermia group (P < 0.05), the LPO level in CSF was significantly lower than that in normothermia (P < 0.01). But the LA level in CSF and the SOD, LPO and LA levels in blood were not significantly different between these two groups, (iii) The total brain histopathologic damage scores in mild hypothermia group were lower than those in normothermia group (P < 0.01).(i) The OFR and LA have some important effect in postischemic-anoxic encephalopathy. (ii) Mild hypothermia induced immediately with reperfusion after CA may improve cerebral outcome. (iii) The mechanism of this beneficial effect may be to reduce the generation of OFR and to mitigate the lipid peroxidation induced by OFR.
Specific genetic modifications of domestic animals by gene targeting and animal cloning
Bin Wang, Jiangfeng Zhou
Reproductive Biology and Endocrinology , 2003, DOI: 10.1186/1477-7827-1-103
Abstract: Discovery of the functions of genes is a remarkably important aspect of biological research. Precise genetic modifications of animals are a powerful methodology to study physiological mechanisms at the molecular level. Gene knock-in and knock-out through gene targeting mediated by DNA homologous recombination paved the way towards the era of mammalian functional genomics. Following the first report of mouse embryonic stem (ES) cells in 1981 [1,2] and the successful alteration of the hypoxanthine phosphoribosyl transferase (HPRT) gene locus through homologous recombination in mouse ES cells in 1989 [3,4], numerous mouse mutants generated through gene targeting have been reported. By the year 2000, an estimated 5000 genes had been inactivated in the mouse [5]. It has become routine in many laboratories around the world to produce mice with specific genetic modifications including gene disruption, gene replacement, and even engineered chromosomal translocation. However, it has been extremely difficult to alter genes in mammals, other than the mouse, by homologous recombination. Although several ES cell lines have been established, primarily from the 129/SvJ mouse strain, and are now commercially available, cloning of ES cells from other mammalian species has made only limited progress. Embryo-derived pluripotent cell lines have been reported in pigs [6] and cattle [7], but successful germ-line chimeric offspring have not yet been reported. The failure to development of ES cell lines has hampered many applications of gene targeting technologies in domestic animals.The breakthrough in animal cloning using somatic cells [8] implies that targeted genetic manipulations of domestic animals could be achieved by combining gene targeting in somatic cells and cloning. In this review, the strategy and potential challenges of gene targeting manipulation in the domestic animal are discussed. Some of the applications of gene targeting in domestic animals for bio-medicine and agricul
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