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巷道火灾烟流滚退距离的理论研究

湘潭矿业学院学报 2003年第4期18卷 22-24页

作者：周福宝王德明中国矿业大学能源科学与工程学院江苏徐州221008

从因次分析的角度出发,获得反映巷道火灾时期烟流滚退距离变化规律的通用无因次表达式,该表达式包含火源热释放速率、巷道风速、巷道倾角等参数与无因次滚退距离之间的函数关系.分析了该表达式中各个参数与无因次滚退距离之间单调性,结... 详细信息

从因次分析的角度出发,获得反映巷道火灾时期烟流滚退距离变化规律的通用无因次表达式,该表达式包含火源热释放速率、巷道风速、巷道倾角等参数与无因次滚退距离之间的函数关系.分析了该表达式中各个参数与无因次滚退距离之间单调性,结果表明En与l呈单调递增关系,fu与l和θ呈单调递减关系.研究结果为巷道火灾烟流滚退的模拟实验奠定了基础.图2,表1,参9.

关键词：巷道火灾烟流滚退因次分析巷道倾角巷道风速

Coupling for Markovian switching jump-diffusions

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Applied Mathematics(A Journal of Chinese Universities) 2013年第2期28卷 204-216页

作者： XI fu-bao School of Mathematics Beijing Institute of Technology

This work is concerned with coupling for a class of Markovian switching jump-diffusion *** processes under consideration can be regarded as a number of jump-diffusion processes modulated by a Markovian switching *** t... 详细信息

关键词： Jump-diffusion Markovian switching successful coupling order-preserving coupling.

An approach for shape optimization of stratosphere airships based on multidisciplinary design optimization

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第11期10卷 1609-1616页

作者： Ouan-bao wang Ji-an CHEN Gong-yi fu Deng-ping DUAN Institute of Aerospace Science & Technology Shanghai Jiao Tong University Shanghai 200240 China

Airship shape is crucial to the design of stratosphere airships. In this paper, multidisciplinary design optimization (MDO) technology is introduced into the design of airship shape. We devise a composite objective function, based on this technology, which takes account of various factors which influence airship performance, including aerodynamics, structures, energy and weight to determine the optimal airship shape. A shape generation algorithm is proposed and appropriate mathematical models are constructed. Simulation results show that the optimized shape gives an improvement in the value of the composite objective function compared with a reference shape.

关键词： Airship shape Multidisciplinary design optimization (MDO) Adaptive simulation annealing Stratosphere airship

Invariant Measure for the Markov Process Corresponding to a PDE System

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Acta Mathematica Sinica,English Series 2005年第3期21卷 457-464页

作者： fu bao XI Department of Mathematics Beijing Institute of Technology Beijing 100081 P. R. China

In this paper, we consider the Markov process （X^∈（t）, Z^∈（t）） corresponding to a weakly coupled elliptic PDE system with a small parameter ∈ 〉 0. We first prove that （X^∈（t）, Z^∈（t）） has the Feller continuity by the coupling method, and then prove that （X^∈（t）, Z^∈（t）） has an invariant measure μ^∈（·） by the Foster-Lyapunov inequality. Finally, we establish a large deviations principle for μ^∈（·） as the small parameter e tends to zero.

关键词： Feller continuity Coupling Invariant measure Foster-Lyapunov inequality Large deviations

DLA+: A Light Aggregation Network for Object Classification and Detection

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International Journal of Automation and computing 2021年第6期18卷 963-972页

作者： fu-Tian wang Li Yang Jin Tang Si-bao Chen Xin wang School of Computer Science and Technology Anhui UniversityHefei 230601China Shenzhen Raixun Information Technology Co. Ltd.Shenzhen 518000China Peking University Shenzhen Institute Shenzhen 518000China

An efficient convolution neural network(CNN) plays a crucial role in various visual tasks like object classification or detection, etc. The most common way to construct a CNN is stacking the same convolution block or complex connection. These approaches may be efficient but the parameter size and computation(Comp) have explosive growth. So we present a novel architecture called"DLA+", which could obtain the feature from the different stages, and by the newly designed convolution block, could achieve better accuracy, while also dropping the computation six times compared to the baseline. We design some experiments about classification and object detection. On the CIFAR10 and VOC data-sets, we get better precision and faster speed than other architecture. The lightweight network even allows us to deploy to some low-performance device like drone, laptop, etc.

关键词： Light weight image classification channel attention efficient convolution object detection

GENERALIZED RECIPROCAL THEOREMS AND THEIR APPLICATIONS

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Applied Mathematics and Mechanics(English Edition) 2002年第2期23卷 203-210页

作者： fu bao-lian(付宝连) Department of Civil Engineering and Mechanics Yanshan UniversityQinhuangdao066004 P R China

Generalized reciprocal theorems of non-coupled and coupled systems, which are valid for two deformed bodies with different constitutive relations are established by generalizing the idea of Betti's reciprocal theorem. When the constitutive relations of the two deformed bodies are all alike and linear elastic the generalized reciprocal theorem of non-coupled systems just becomes Betti's. Meanwhile the generalized reciprocal theorems are applied to simulate calculations in elasticity.

关键词： reciprocal theorem generalized reciprocal theorem non-coupled system coupled system

A Li_(3)P nanoparticle dispersion strengthened ultrathin Li metal electrode for high energy density rechargeable batteries

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Nano Research 2024年第5期17卷 4031-4038页

作者： Lin fu Xiancheng wang bao Zhang Zihe Chen Yuanjian Li Yongming Sun Provincial Guizhou Key Laboratory of Green Chemical and Clean Energy Technology School of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Institute of Materials Research and Engineering Agency for Science Technology and Research(A*STAR)Singapore 138634Singapore

Achievement of lithium(Li)metal anode with thin thickness(e.g.,≤30µm)is highly desirable for rechargeable high energy density ***,the fabrication and application of such thin Li metal foil electrode remain challenging due to the poor mechanical processibility and inferior electrochemical performance of metallic ***,mechanico-chemical synthesis of robust ultrathin Li/Li_(3)P(LLP)composite foils(~15µm)is demonstrated by employing repeated mechanical rolling/stacking operations using red P and metallic Li as raw *** in-situ formed Li+-conductive Li_(3)P nanoparticles in metallic Li matrix and their tight bonding strengthen the mechanical durability and enable the successful fabrication of free-standing ultrathin Li metal composite ***,it also reduces the electrochemical Li nucleation barrier and homogenizes Li plating/stripping *** matching to high-voltage LiCoO_(2),the full cell with a low negative/positive(N/P)capacity ratio of~1.5 offers a high energy density of~522 W·h·kg^(-1) at 0.5 C based on the mass of cathode and *** into account its facile manufacturing,potentially low cost,and good electrochemical performance,we believe that such an ultrathin composite Li metal foil design with nanoparticle-dispersion-strengthened mechanism may boost the development of high energy density Li metal batteries.

关键词： lithium metal anode high energy density battery mechanico-chemical synthesis ultrathin Li/Li_(3)P composite foil low negative/positive capacity ratio

New model of linkage evolution for the transtensional fault systems in the Nanpu Sag of Bohai Bay Basin:Insight from seismic interpretation and analogue modelling

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Petroleum Science 2024年第4期21卷 2287-2310页

作者： Yu-Heng wang fu-Sheng Yu bao-Yin Zhao Ling-Jian Meng College of Geosciences China University of Petroleum(Beijing)Beijing102249China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China Jidong Oilfield Company PetroChina Limited CompanyTangshan063004HebeiChina

The evolution of faults within the same stress field is frequently influenced by numerous factors,involving the reactivation of pre-existing structures,stress transmission through ductile detachment layers,and the growth,interaction,as well as linkage of new fault *** study analyses a complex multi-phase oblique extension fault system in the Nanpu Sag(NPS)of the Bohai Bay Basin(BBB),***-resolution three-dimensional(3D)seismic data and analogue modelling indicate that the oblique extensional reactivation of pre-existing structures governs the sequential arrangement of fault segments in the caprock,and they dip synthetically to the reactivated fault at *** the NW-SE extension in the Eocene,the predominant movement of the pre-existing fault is ***,during the N-S extension since the Oligocene,inclined at *** the pre-existing fault,forming splay fault segments and ultimately creating large en-echelon arcuate faults linked by relay *** fault throw-distance(T-D)and laser scanning,we reconstructed the fault evolution model of oblique extension reactivation in the presence of a ductile detachment *** study illustrates that the arcuate faults can be categorized into linear master fault segments controlled by pre-existing structures,bending splay faults in the termination zone,and normal fault segments responding to the regional stress *** interaction between faults occurs among normal faults and strike-slip faults,and the kinematic unification of the two fault systems is accomplished in the intersection *** the faults continue to evolve,the new fault segments tend to relinquish the control of pre-existing structures and concentrate more on the development of planar and continuous major *** ductile detachment layer significantly contributes to the uniform distribution of strain,resulting in narrow shear zones and discontinuous normal faults in its absence.

关键词： Analogue modelling Transtensional deformation Fault linkage Fault intersection zone Nanpu Sag of Bohai Bay basin

Effects of Lu^(3+ )Doping on Optical Properties and Laser Performances of NYAB Crystal

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Chinese Physics Letters 1996年第8期13卷 602-605页

作者： PAN Heng-fu wang Pu FAN Xiao-feng wang Rui-hua LU bao-sheng Institute of Crystal Materials Shandong University Jinan 250100

Volume compensation(VC)achieved in(Lu,Nd):YAl_(3)(BO_(3))_(4)(YAB)crystal codoped with Lu^(3+)and Nd^(3+)ions is *** lattice parameters,spectral properties and laser performances of the VC(Lu,Nd):YAB and single-doped Nd:YAB(NYAB)crystals are measured and *** results indicate that the laser performances of NYAB crystal can be greatly improved by the VC doping.

关键词： NYAB Nd laser