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Journal of Materials Science & Technology 2016年第10期32卷 996-1002页

作者： Yujun Jia Hejun li lu li Qiangang Fu Kezhi li State Key Laboratory of Solidification Processing Northwestern Polytechnical University

Ablation resistance of monolithic LaB-doped ZrC coating for SiC-coated carbon/carbon composites by supersonic atmospheric plasma spray was investigated under an oxyacetylene torch with a heat flux of 4.18 MW/m~2. Result shows that ZrC coating with 10 vol.% LaBhas a good ablation resistance compared with pure ZrC, ZrC with 20 vol.% LaBand SiC-doped ZrC coating. After ablation for 15 s, the weight is increased by 1.12 mg/s. The good ablation resistance is ascribed to the formation of a stabilized scale which consists of protective LaZrO-containing molten phase and ZrOparticles keeping the integrity of the coating.

关键词： Ceramic coating C/C composites Ablation performance

Novel load balancing DHT scheme for the heterogeneous system

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Journal of Systems Engineering and Electronics 2008年第4期19卷 835-842页

作者： li Yujun lu Xianliang Hou Mengshu School of Computer Science and Engineering Univ. of Electronics Science and Technology of China Chengdu 610054 P. R. China

The capacities of the nodes in the peer-to-peer system are strongly heterogeneous, hence one can benefit from distributing the load, based on the capacity of the nodes. At first a model is discussed to evaluate the load balancing of the heterogeneous system, and then a novel load balancing scheme is proposed based on the concept of logical servers and the randomized binary tree, and theoretical guarantees are given. Finally, the feasibility of the scheme using extensive simulations is proven.

关键词： distributed hash table heterogeneity randomized binary tree load balancing

Quantum Approach to Fast Protein-Folding Time

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Chinese Physics Letters 2019年第8期36卷 23-35页

作者： li-Hua lu You-Quan li Zhejiang Province Key Laboratory of Quantum Technology&Device and Department of PhysicsZhejiang UniversityHangzhou 310027 Collaborative Innovation Center of Advanced Microstructure Nanjing UniversityNanjing 210008

In the traditional random-conformational-search model,various hypotheses with a series of meta-stable intermediate states were proposed to resolve the Levinthal paradox in protein-folding *** we introduce a quantum strategy to formulate protein folding as a quantum walk on a definite graph, which provides us a g’eneral framework without making *** it by the mean of first passage time,we find that the folding time via our quantum approach is much shorter than the one obtained *** random *** idea is expected to evoke more insights for future studies.

关键词： Quantum Fast Protein-Folding Time

DEM simulation of particle mixing in a sheared granular flow

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Particuology 2008年第6期6卷 445-454页

作者： li-Shin lu Shu-San Hsiau Department of Mechanical Engineering Technology and Science Institute of Northern Taiwan Department of Mechanical Engineering National Central University

Mixing behaviors of particles are simulated in a sheared granular flow using differently colored but otherwise identical glass spheres, with five different bottom wall velocities. By DEM simulation, the solid fractions, velocities, velocity fluctuations and granular temperatures are measured. The mixing layer thicknesses are compared with the calculations from a simple diffusion equation using the data of apparent self-diffusion coefficients obtained from the current simulation measurements. The calculations and simulation results showed good agreements, demonstrating that the mixing process of granular materials occurred through the diffusion mechanism.

关键词： DEM Particle mixing Sheared granular flow Diffusion

A quadratic programming method for optimal degree reduction of Bézier curves with G^1-continuity

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第10期8卷 1657-1662页

作者： lu li-zheng WANG Guo-zhao Institute of Computer Graphics and lmage Processing Department of Mathematics Zhejiang University Hangzhou 310027 China

This paper presents a quadratic programming method for optimal multi-degree reduction of B6zier curves with G^1-continuity. The L2 and I2 measures of distances between the two curves are used as the objective functions. The two additional parameters, available from the coincidence of the oriented tangents, are constrained to be positive so as to satisfy the solvability condition. Finally, degree reduction is changed to solve a quadratic problem of two parameters with linear constraints. Applications of degree reduction of Bezier curves with their parameterizations close to arc-length parameterizations are also discussed.

关键词： Degree reduction Bezier curves Optimal approximation G^1-continuity Quadratic programming

Removal of chloride from simulated acidic wastewater in the zinc production

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Chinese Journal of Chemical Engineering 2019年第5期27卷 1037-1043页

作者： Weizao liu li lu Yao lu Xiaowei Hu Bin liang College of Chemical Engineering Sichuan UniversityChengdu 610065China China Tin Group Co. Ltd.Liuzhou 545000China

The removal of chloride from the zinc electrolyte produced during hydrometallurgical zinc production is challenging. The ion-exchange method is a promising way to remove chloride if the resin washing wastewater can be recycled. This paper focuses on chloride removal from resin washing wastewater to enable its reuse. Various processing factors including the oxygen gas velocity, temperature, and reaction time were investigated systematically. The results show that the optimal conditions for dechlorination are an oxygen gas velocity of 0.5 L-min^-1, a reaction temperature of 80 ℃, and a reaction time of 30 min. A dechlorination efficiency of 80% with a residual chloride ion concentration less than 200 mg-L^-1 was achieved, which meets the requirements for the recycling of wastewater. The presence of manganese accelerates the dechlorination by forming a Mn^2+- MnO^2-MnO4^-Mn^2+ redox cycle. In this process, about 15 kg of the MnO2 and all of the zinc can be recovered from 100 m^3 wastewater, and the wastewater can be reused, which makes the ion-exchange method a promising technique for chloride removal.

关键词： Ion-exchange Dechlorination Ozone Zinc production Oxidation

Paths of algebraic hyperbolic curves

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第6期9卷 816-821页

作者： Ya-juan li li-zheng lu Guo-zhao WANG School of Science Hangzhou Dianzi University Hangzhou 310018 China Department of Mathematics Zhejiang University Hangzhou 310027 China

Cubic algebraic hyperbolic （AH） Bezier curves and AH spline curves are defined with a positive parameter a in the space spanned by {1, t, sinht, cosht}. Modifying the value of a yields a family ofAH Bezier or spline curves with the family parameter α. For a fixed point on the original curve, it will move on a defined curve called ＂path of AH curve＂（AH Bezier and AH spline curves） when a changes. We describe the geometric effects of the paths and give a method to specify a curve passing through a given point.

关键词： Algebraic hyperbolic (AH) Bezier curve AH spline curve Path Shape modification

Transient Behaviors of Thermo-Hydraulic and Thermal Stratification in the Pressurizer Surgeline for the Nuclear Power Plant

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Journal of Thermal Science 2022年第2期31卷 344-358页

作者： YU Huajie li lu TANG Qionghui PENG Yue li Yinshi State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Shenzhen 518172China Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China

In pressurized water reactor(PWR)system,the surgeline plays an important role in bonding the pressurizer and the primary *** considerable problems,including the thermo-hydraulics,the thermal stratification and the accompanying thermal stress under transient conditions,pose risks to the surgeline ***,a fully-coupled flow-heat-thermo-elasticity model was developed to investigate the transient behavior of thermo-hydraulic parameters and the thermal stratification phenomenon in *** evaluate the nonuniformity of the stratified flow,a stratification degree indicatorζis *** is found that during the outsurge flow,the increase of temperature variation will enlarge the temperature gradient on the wall,corresponding to a more serious *** the cases of positive temperature variation,the higher temperature variation causes higher stratification degreeζ,and vice *** mass flow rate m and the stratification degree are in negative *** local deformation can reach 1.802 cm under a 50 K temperature variation,while its location varies from case to *** attention should be paid to the regulation between the highest deformation location and the surgeline thermo-hydraulic parameters.

关键词： pressurized water reactor surgeline transient thermo-hydraulic thermal stratification thermal stress-strain

The Connection Between the Metric and Generalized Projection Operators in Banach Spaces

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Acta Mathematica Sinica,English Series 2007年第6期23卷 1109-1120页

作者： Yakov ALBER Jin lu li Department of Mathematics Technion Israel Institute of Technology 32000 Haifa Israel Department of Mathematical Sciences Shawnee State University Portsmouth Ohio 45662 USA

In this paper we study the connection between the metric projection operator PK ： B →K, where B is a reflexive Banach space with dual space B^＊ and K is a non-empty closed convex subset of B, and the generalized projection operators ∏K ： B → K and πK ： B^＊ → K. We also present some results in non-reflexive Banach spaces.

关键词： Banach spaces normalized duality mappings metric and generalized projection operators,variational inequalities minimization problems closed and convex subsets and cones

Explicit G2-constrained Merging of a Pair of Bezier Curves by Control Point Optimization

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自动化学报 2014年第7期40卷 1505-1508页

作者： lu li-Zheng QIU Yu-Yang School of Statistics and Mathematics Zhejiang Gongshang University Hangzhou 310018 China

This paper presents a simple and explicit method for G~2-constrained merging of a pair of Bezier curves by minimizing the l_2 distance defined in terms of control points. After expressing the l_2 distance as a quadratic function of two parameters, the optimally merged curve can be explicitly obtained, which is achieved by control point optimization such that the l_2 distance is minimized. The existence of the unique solution is shown by proving that the l_2 distance is convex. The proposed method is explicit and efficient since it is non-iterative and expressed by known control points. Numerical examples demonstrate the effectiveness of the new method.

关键词：贝塞尔曲线控制点合并 G2 优化二次函数距离最小化