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Search Results: 1 - 10 of 150090 matches for " Dong-Sheng Wang "
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Quantum Phase Space, Quantization Hierarchy, and Eclectic Quantum Many-Body System
Dong-Sheng Wang
Physics , 2014, DOI: 10.1016/j.optcom.2014.04.002
Abstract: An operator-valued quantum phase space formula is constructed. The phase space formula of Quantum Mechanics provides a natural link between first and second quantization, thus contributing to the understanding of quantization problem. By the combination of quantization and hamiltonization of dynamics, a quantization hierarchy is introduced, beyond the framework of first and second quantization and generalizing the standard quantum theory. We apply our quantization method to quantum many-body system and propose an eclectic model, in which the dimension of Hilbert space does not scale exponentially with the number of particles due to the locality of interaction, and the evolution is a constrained Hamiltonian dynamics.
Spinless Quantum Field Theory and Interpretation
Dong-Sheng Wang
Physics , 2013,
Abstract: Quantum field theory is mostly known as the most advanced and well-developed theory in physics, which combines quantum mechanics and special relativity consistently. In this work, we study the spinless quantum field theory, namely the Klein-Gordon equation, and we find that there exists a Dirac form of this equation which predicts the existence of spinless fermion. For its understanding, we start from the interpretation of quantum field based on the concept of quantum scope, we also extract new meanings of wave-particle duality and quantum statistics. The existence of spinless fermion is consistent with spin-statistics theorem and also supersymmetry, and it leads to several new kinds of interactions among elementary particles. Our work contributes to the study of spinless quantum field theory and could have implications for the case of higher spin.
Convex decomposition of dimension-altering quantum channels
Dong-Sheng Wang
Physics , 2015,
Abstract: Quantum channels, which are completely positive and trace preserving mappings, can alter the dimension of a system; e.g., a quantum channel from a qubit to a qutrit. We study the convex set properties of dimension-altering quantum channels, and particularly the channel decomposition problem in terms of convex sum of extreme channels. We provide various quantum circuit representations of extreme and generalized extreme channels, which can be employed in an optimization to approximately decompose an arbitrary channel. Numerical simulations of low-dimensional channels are performed to demonstrate our channel decomposition scheme.
Relation between Fresh Groundwater Evolution and Some Diseases Caused by Drinking Water

WANG Dong-sheng,

地球学报 , 1998,
Abstract: The fresh underground water (FUW) is the rare natural resource of hydrosphere in earth and the sensitive weak key element of environment.The changes of FUW have always been the context for human life.The most gravein in the FUW changes is the increasing N content in fresh groundwater,and shallow ground water is turned into the N-reservoir in the continent. A lot of diseases caused by environment are attributed to drinking water. Distribution of the diseases caused by drinking water (DCDW) is under the control of the hydrogeochemical zone. The DCDW with poor iodine may occur in the oxidizing(intake) area, and the DCDW with rich fluorine may occur in reducing (discharge) area, and the Keshan disease of DCDW may occur in a damp area where the FUW is rich in H 2S gas and organic matter.
Basis for the Use of Nitrogen Isotopes to Identify Nitrogen Contamination of Groundwater

WANG Dong-sheng,

地球学报 , 1997,
Abstract: 华北地下水中硝态氮浓度和δ^15N值如下:在自然状态下为4.4≤+5,来自下水道粪便污染者为20-70和+10-+20,受化肥污染者为30-60和-2-+5。因此,氮同位素可用来识别氮污染来源和氮的迁移。

WANG Dong-sheng,

地球学报 , 1990,
Abstract: <正> 处于盆地外带的地下水是循环水。内带卤水主要是沉积-变质水。侏罗系黄卤盐分的增长主要是蒸发浓缩过程引起的。Aa亚区上三叠系黄卤的盐分来自古大气降水对下伏岩盐的溶滤。三叠系(T_2l1—T_2j3)黑卤起源于溶滤岩盐的结晶水与析盐后的残余海水的混合。
Energy Structure of Two-Dimensional Graphene-Semiconductor Quantum Dot  [PDF]
Jin Tong Wang, Guang-Lin Zhao, Diola Bagayoko, Dong-Sheng Guo, Jincan Chen, Zhiwei Sun
World Journal of Condensed Matter Physics (WJCMP) , 2013, DOI: 10.4236/wjcmp.2013.33023

Graphene is a newly discovered material that possesses unique electronic properties. It is a two-dimensional singlelayered sheet in which the electrons are free and quasi-relativistic. These properties may open a door for many new electronic applications. In this paper we proposed a flat 2-dimensional circular graphene-semiconductor quantum dot. We have carried out theoretical studies including deriving the Dirac equation for the electrons inside the graphene-semiconductor quantum dot and solving the equation. We have established the energy structure as a function of the rotational quantum number and the size (radius) of the dot. The energy gap between the energy levels can be tuned with the radius of the quantum dot. It could be useful for quantum computation and single electron device application.

Numerical Simulation of Solitary Wave Induced Flow Motion around a Permeable Submerged Breakwater
Jisheng Zhang,Jinhai Zheng,Dong-Sheng Jeng,Gang Wang
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/508754
Abstract: This paper presents a numerical model for the simulation of solitary wave transformation around a permeable submerged breakwater. The wave-structure interaction is obtained by solving the Volume-Averaged Reynolds-Averaged Navier-Stokes governing equations (VARANS) and volume of fluid (VOF) theory. This model is applied to understand the effects of porosity, equivalent mean diameter of porous media, structure height, and structure width on the propagation of a solitary wave in the vicinity of a permeable submerged structure. The results show that solitary wave propagation around a permeable breakwater is essentially different from that around impermeable one. It is also found that the structure porosity has more impact than equivalent mean diameter on the wave transformation and flow structure. After interacting with the higher structure, the wave has smaller wave height behind the structure with a lower travelling speed. When the wave propagates over the breakwater with longer width, the wave travelling speed is obviously reduced with more wave energy dissipated inside porous structure.
Photon counting statistics in single multi-level quantum system

Wang Dong-Sheng,Zheng Yu-Jun,

中国物理 B , 2010,
Abstract: We theoretically study the statistics of photon emission of a single multi-level quantum system by employing the generating functions approach developed recently. The generalized decay constants are included in a single multi-level quantum system with quasi-degenerated levels in this work although they are normally neglected in the absence of (quasi-)degeneracies in a multi-level quantum system within the rotating wave approximation. The quantum beats, the line shapes and the Mandel's Q parameters, etc. are studied.
Nanosized AsO/FeO complexes combined with magnetic fluid hyperthermia selectively target liver cancer cells
Zi-Yu Wang, Jian Song, Dong-Sheng Zhang
World Journal of Gastroenterology , 2009,
Abstract: AIM: To study the methods of preparing the magnetic nano-microspheres of Fe2O3 and As2O3/Fe2O3 complexes and their therapeutic effects with magnetic fluid hyperthermia (MFH).METHODS: Nanospheres were prepared by chemical co-precipitation and their shape and diameter were observed. Hemolysis, micronucleus, cell viability, and LD50 along with other in vivo tests were performed to evaluate the Fe2O3 microsphere biocompatibility. The inhibition ratio of tumors after Fe2O3 and As2O3/Fe2O3 injections combined with induced hyperthermia in xenograft human hepatocarcinoma was calculated.RESULTS: Fe2O3 and As2O3/Fe2O3 particles were round with an average diameter of 20 nm and 100 nm as observed under transmission electron microscope. Upon exposure to an alternating magnetic field (AMF), the temperature of the suspension of magnetic particles increased to 41-51°C, depending on different particle concentrations, and remained stable thereafter. Nanosized Fe2O3 microspheres are a new kind of biomaterial without cytotoxic effects. The LD50 of both Fe2O3 and As2O3/Fe2O3 in mice was higher than 5 g/kg. One to four weeks after Fe2O3 and As2O3/Fe2O3 complex injections into healthy pig livers, no significant differences were found in serum AST, ALT, BUN and Cr levels among the pigs of all groups (P > 0.05), and no obvious pathological alterations were observed. After exposure to alternating magnetic fields, the inhibition ratio of the tumors was significantly different from controls in the Fe2O3 and As2O3/Fe2O3 groups (68.74% and 82.79%, respectively; P < 0.01). Tumors of mice in treatment groups showed obvious necrosis, while normal tissues adjoining the tumor and internal organs did not.CONCLUSION: Fe2O3 and As2O3/Fe2O3 complexes exerted radiofrequency-induced hyperthermia and drug toxicity on tumors without any liver or kidney damage. Therefore, nanospheres are ideal carriers for tumor-targeted therapy.
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