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Search Results: 1 - 10 of 39394 matches for " He Bo "
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Nonperturbative contribution to the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi and Gribov-Levin-Ryskin equation
Bo He
Physics , 1999,
Abstract: By studying the nonperturbative contribution to the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi and Gribov-Levin-Ryskin equation, it is found that (i) the nonperturbative contribution suppresses the evolution rate at the low $Q^2$, small-x region; (ii) the nonperturbative contribution weakens the shadowing effect. The method in this paper suggests a smooth transition from the low $Q^2$ ("soft"), where nonperturbative contribution dominates, to the large $Q^2$ ("hard") region, where the perturbative contribution dominates and the nonperturbative contribution can be neglected. PACS numbers:12.38.Aw, 13.60.Hb
On Diophantine quintuple Conjecture
Wenquan Wu,Bo He
Mathematics , 2014, DOI: 10.3792/pjaa.90.84
Abstract: In this note, we prove that if $\{a,b,c,d,e\}$ with $a
Atmospheric Environmental Quality Assessment RBF Model Based on the MATLAB  [PDF]
Zhonghua Fei, Dinggui Luo, Zhefei He, Bo Li
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.37081
Abstract: A new method-RBF model is found to assess the atmospheric quality by use of the PREMNMX function in MATLAB to pretreat the original data and the RAND function to construct enough training samples, checking samples and outputs of their targets through linear interpolation between grades of the atmospheric quality evaluation standard. A favorable assessment result is achieved by applying this method to assess atmospheric environmental quality in a city, which shows this new method is meaningful in improving the precision and scientificity of atmospheric environmental quality assessment.
The Research on Land-Use Change and Ecological Environment Effect of Urban Landscape in China  [PDF]
Dengfei Li, Youyou Huang, Bo Qiao, Xianchun Yan, Wei He
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.77072
Abstract: The rapid expansion of urban construction land has become the major characteristic of urban land-use change in China today. Meanwhile, the rapid urbanization process has led to the great changes of urban landscape in China, and it also has had certain impacts on environmental factors such as climate, soil, hydrology, biodiversity, etc., then it has made the overall ecological environment deteriorated. This study is based on the summary and analysis of research on land-usechange and ecological environment effect of urban landscape in recent 20 years in China, and it aims at providing scientific bases and theoretical supports for the planning and construction of urban landscape, the sustainable land-use of city and the protection of ecological environment in China.
Solving SAT by Algorithm Transform of Wu''s Method
Solving SAT by Algorithm Transform of Wu s Method

HE Simin,ZHANG Bo,
HE Simin
,ZHANG Bo

计算机科学技术学报 , 1999,
Abstract: Recently algorithms for solving propositional satisfiability problem,or SAT, have aroused great illterest, and more attention has been paid to trans-formation problem solving. The commonly used transformation is representationtransform, but since its ifltermediate computing procedure is a black box from theviewpoint of the original problem, this aPproach has many limitations. In this paper, a new approach called algorithm transform is proposed and applied to solvingSAT by Wu's method, a general algorithm for solving polynomial equations. By es-tablishing the correspondellce between the primitive operation in Wu's method andclause resolution in SAT, it is shown that Wu's method, when used for solving SAT,is primarily a restricted clause resolution procedure. While Wu's method illtroduceselltirely new concepts, e.g. characteristic set of clauses, to resolution procedure, thecomplexity result of resolution procedure suggests an exponential lower bound toWu's method for solving general polynomial equations. Moreover, this algorithmtransform can help achieve a more efficiellt imp1ementation of Wu's method since itcan avoid the complex manipulation of polynomials and can make the best use ofdomain specific knowledge.
Extraordinary Light Total Reflection Angle Formula of Positive Uniaxial Crystal for Optical Axis in Incidence Plane
光轴在入射面内的正单轴晶体e光全反射角公式

HE Bo,
何波

红外 , 2006,
Abstract: 用惠更斯作图法推导光轴在入射面内的正单轴晶体e光全反射角公式:i=arcsin(1/n)((n_e~2-n_o~2)sin~2α n_o~2)~(1/2),它与光轴在入射面内的负单轴晶体e光全反射角公式形式完全相同;所以光轴在入射面内的单轴晶体e光全反射角公式为i= arcsin(1/n)((n_e~2-n_o~2)cos~2α n_e~2)~(1/2)=arcsin(1/n)(n_e~2-n_o~2)sin~2α n_o~2)~(1/2)(简称“何波公式”)。
On the degrees of freedom of lattice electrodynamics
Bo He,F. L. Teixeira
Physics , 2004, DOI: 10.1016/j.physleta.2005.01.001
Abstract: Using Euler's formula for a network of polygons for 2D case (or polyhedra for 3D case), we show that the number of dynamic\textit{\}degrees of freedom of the electric field equals the number of dynamic degrees of freedom of the magnetic field for electrodynamics formulated on a lattice. Instrumental to this identity is the use (at least implicitly) of a dual lattice and of a (spatial) geometric discretization scheme based on discrete differential forms. As a by-product, this analysis also unveils a physical interpretation for Euler's formula and a geometric interpretation for the Hodge decomposition.
Geometric Finite Element Discretization of Maxwell Equations in Primal and Dual Spaces
Bo He,F. L. Teixeira
Physics , 2005, DOI: 10.1016/j.physleta.2005.09.002
Abstract: Based on a geometric discretization scheme for Maxwell equations, we unveil a mathematical\textit{\}transformation between the electric field intensity $E$ and the magnetic field intensity $H$, denoted as Galerkin duality. Using Galerkin duality and discrete Hodge operators, we construct two system matrices, $[ X_{E}] $ (primal formulation) and $[ X_{H} % ] $ (dual formulation) respectively, that discretize the second-order vector wave equations. We show that the primal formulation recovers the conventional (edge-element) finite element method (FEM) and suggests a geometric foundation for it. On the other hand, the dual formulation suggests a new (dual) type of FEM. Although both formulations give identical dynamical physical solutions, the dimensions of the null spaces are different.
HSR: L1/2 Regularized Sparse Representation for Fast Face Recognition using Hierarchical Feature Selection
Bo Han,Bo He,Tingting Sun,Mengmeng Ma,Amaury Lendasse
Computer Science , 2014,
Abstract: In this paper, we propose a novel method for fast face recognition called L1/2 Regularized Sparse Representation using Hierarchical Feature Selection (HSR). By employing hierarchical feature selection, we can compress the scale and dimension of global dictionary, which directly contributes to the decrease of computational cost in sparse representation that our approach is strongly rooted in. It consists of Gabor wavelets and Extreme Learning Machine Auto-Encoder (ELM-AE) hierarchically. For Gabor wavelets part, local features can be extracted at multiple scales and orientations to form Gabor-feature based image, which in turn improves the recognition rate. Besides, in the presence of occluded face image, the scale of Gabor-feature based global dictionary can be compressed accordingly because redundancies exist in Gabor-feature based occlusion dictionary. For ELM-AE part, the dimension of Gabor-feature based global dictionary can be compressed because high-dimensional face images can be rapidly represented by low-dimensional feature. By introducing L1/2 regularization, our approach can produce sparser and more robust representation compared to regularized Sparse Representation based Classification (SRC), which also contributes to the decrease of the computational cost in sparse representation. In comparison with related work such as SRC and Gabor-feature based SRC (GSRC), experimental results on a variety of face databases demonstrate the great advantage of our method for computational cost. Moreover, we also achieve approximate or even better recognition rate.
THE NONLINEAR QCD DYNAMICAL EQUATIONS WITH HIGHER ORDER EFFECTIVE COUPLING

He Bo,Zhu Wu-ming,

中国物理 B , 2000,
Abstract: Through studying the nonlinear QCD dynamical equations with higher order effective coupling, we find that shadowing effect is substantially weaker than that neglecting higher order effective coupling. This conclusion is very important for explaining the data from DESY ep collider HERA.
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