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Search Results: 1 - 10 of 247592 matches for " Yang G. "
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An Upper Bound on the Critical Value β Involved in the Blasius Problem
G. C. Yang
Journal of Inequalities and Applications , 2010, DOI: 10.1155/2010/960365
Abstract: Utilizing the Schauder fixed point theorem to study existence on positive solutions of an integral equation, we obtain an upper bound of the critical value β involved in the Blasius problem, in particular, β < 18733/105= 0.18733. Previous results only presented a lower bound β ≥ 1/2 and numerical investigations β 0.3541.
Adiabatic Cooling with Non-Abelian Anyons
G. Gervais,Kun Yang
Physics , 2010, DOI: 10.1103/PhysRevLett.105.086801
Abstract: We show in this Letter that the ground state degeneracy associated with the presence of non-Abelian anyons can be probed by using an adiabatic cooling process based on the non-Abelian entropy. In particular, we show that when the number of such anyons is increased adiabatically at sufficiently low temperatures, the non-Abelian liquid undergoes cooling, whereas heating occurs in the Abelian case. Estimates are provided for the cooling power produced by the non-Abelian anyon refrigerator, and its implementation in non-Abelian fractional quantum Hall liquids is discussed.
Magnetic Fields and Passive Scalars in Polyakov's Conformal Turbulence
G. Ferretti,Z. Yang
Physics , 1992, DOI: 10.1209/0295-5075/22/9/001
Abstract: Polyakov has suggested that two dimensional turbulence might be described by a minimal model of conformal field theory. However, there are many minimal models satisfying the same physical inputs as Polyakov's solution (p,q)=(2,21). Dynamical magnetic fields and passive scalars pose different physical requirements. For large magnetic Reynolds number other minimal models arise. The simplest one, (p,q)=(2,13) makes reasonable predictions that may be tested in the astrophysical context. In particular, the equipartition theorem between magnetic and kinetic energies does not hold: the magnetic one dominates at larger distances.
Anomalous differential conductance of In-Bi2Te3 contact
R. Yang,G. Yu
Physics , 2011,
Abstract: The differential conductance of In/Bi2Te3 contact under cryogenic temperature is investigated. Anomalous zero/finite bias differential conductance has been observed. The dependence of the observed anomalous differential conductance on magnetic field and temperature is studied. Data analysis indicates that the anomalous differential conductance is caused by the peculiar transport properties of the superconducting Indium/Bi2Te3 interface where Andreev reflection plays a key role.
Optimal asymptotic cloning machines
G. Chiribella,Y. Yang
Physics , 2014, DOI: 10.1088/1367-2630/16/6/063005
Abstract: We pose the question whether the asymptotic equivalence between quantum cloning and quantum state estimation, valid at the single-clone level, still holds when all clones are examined globally. We conjecture that the answer is affirmative and present a large amount of evidence supporting our conjecture, developing techniques to derive optimal asymptotic cloners and proving their equivalence with estimation in virtually all scenarios considered in the literature. Our analysis covers the case of arbitrary finite sets of states, arbitrary families of coherent states, arbitrary phase- and multiphase-covariant sets of states, and two-qubit maximally entangled states. In all these examples we observe that the optimal asymptotic fidelity enjoys a universality property, as its scaling does not depend on the specific details of the set of input states, but only on the number of parameters needed to specify them.
Stability of Nonlinear Regime-switching Jump Diffusions
Zhixin Yang,G. Yin
Mathematics , 2014, DOI: 10.1016/j.na.2012.02.007
Abstract: Motivated by networked systems, stochastic control, optimization, and a wide variety of applications, this work is devoted to systems of switching jump diffusions. Treating such nonlinear systems, we focus on stability issues. First asymptotic stability in the large is obtained. Then the study on exponential p-stability is carried out. Connection between almost surely exponential stability and exponential p-stability is exploited. Also presented are smooth-dependence on the initial data. Using the smooth-dependence, necessary conditions for exponential p-stability are derived. Then criteria for asymptotic stability in distribution are provided. A couple of examples are given to illustrate our results.
Analysis for Pull-In Voltage of a Multilayered Micro-Bridge Driven by Electrostatic Force  [PDF]
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.21007
Abstract: A trial solution for bending deflection of a multilayered micro-bridge subject to a voltage induced load is presented. The relation between the applied voltage and the displacements of the micro-bridge in the pull-in state is analyzed by energy method. Furthermore, two analytical expressions about normalized displacement and pull-in voltage are carried out. It’s proved that the value of normalized displacement is not influenced by residual stress if axial and shear deformation is ignored. Finally, the theoretical results are compared with that of FEM, and they show good agreement.
Net Nitrogen Mineralization in Natural Ecosystems across the Conterminous US  [PDF]
LeeAnna Y. Chapman, Steven G. McNulty, Ge Sun, Yang Zhang
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.49125

Nitrogen is the primary nutrient limiting ecosystem productivity over most of the US. Although soil nitrogen content is important, knowledge about its spatial extent at the continental scale is limited. The objective of this study was to estimate net nitrogen mineralization for the conterminous US (CONUS) using an empirical modeling approach by scaling up site level measurements. Net nitrogen mineralization and total soil nitrogen data across the CONUS were obtained from three different ecosystems: low elevation forests, high elevation forests, and grasslands. Equations to predict net nitrogen mineralization were developed through stepwise linear regression using total Kjeldahl nitrogen, air temperature, precipitation, and nitrogen deposition as predictor variables for four categories: low elevation high temperature forests (coefficient of determination, R2 = 0.83), low elevation low temperature forests (R2 = 0.74), high elevation forests (R2 = 0.80), and grasslands (R2 = 0.88). A map of net nitrogen mineralization was developed in GIS using these equations and national-scale databases for the CONUS. The result shows that net nitrogen mineralization varies widely across the US. Grasslands were predicted to have the lowest net nitrogen mineralization, while low elevation forests in the east had the highest. Mean values were 14.3 kg·ha-1

Electrical Tree Simulation Based on the Self-Organization Criticality  [PDF]
H. M. Hu, Y. Yang, W. Lu, G. P. Zhao
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B241

So far much effort has been made to understand the development of electrical treeing. For the simulation based study of electrical treeing, the most common method is to apply DBM stochastic model to simulate the growing of electrical treeing patterns. Previous simulation results showed that this stochastic model is capable of simulating the real electrical treeing patterns in a point-to-plane electrode system. However, this model only allows the tree channels to propagate on equipotential lines proportional to local electrical field. Therefore, it is necessary to develop a novel stochastic model to simulate the electrical patterns in order to get a good agreement with experimental results.

Determination of Exposure to Medical and Industrial Toxic Chemicals from Beijing by Human Hair, Nail and Blood Analysis  [PDF]
G. Yang, D. Kechkeche, H. Belhadj-Tahar, N. Sadeg
Forensic Medicine and Anatomy Research (FMAR) , 2015, DOI: 10.4236/fmar.2015.31006
Abstract: The aim of the present work was to investigate the exposure to the medical and industrial toxic chemicals. The research was carried out on hair, nail and blood samples in a panel of 40 healthy volunteers aged 7 to 77 with an average of 45 ± 19 years (18 women (45%) and 22 men (55%)). All of these individuals had not received medication for at least 1 year, including antibiotics and psychotropic. This study was realized from July 2013 to March 2014 in Beijing, China. The method for an accurate and reliable screening of medical and an industrial toxic chemical was based on detection and assay by ultra-high performance liquid chromatography with UV detection type of diode arrays. Also more than 10,000 toxic molecules commonly found in western industrial countries were screened by coupling gas chromatography and mass spectrometry. The main results indicate that the molecules analyzed are mainly antibiotic (Gentamycine and Tobramycine), antidepressant (Amitriptylin and its metabolites), narcotic (MDMA and Clonitazene), ingredient in cosmetics (Benzenediol and Benzoic acid), insecticide (Carbamate derivative), ketamine, chlorhexidine and phthalate derivatives. There are no detailed documented baseline data of the analysis of medical and Industrial toxic pollutants in hair, nail and blood samples in Beijing; however, this study should be completed on samples from other provinces of China. This study is the first of its kind. Therefore, further studies should be conducted in other cities and provinces of China to be compared with each other.
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