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Multi-objective process parameter optimization for energy saving in injection molding process

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第5期13卷 382-394页

作者： Ning-yun lu Gui-xia GONG Yi YANG Jian-hua lu College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Department of Control Engineering and Science Zhejiang University Hangzhou 310027 China School of Computer Science and Engineering Southeast University Nanjing 210096 China

This paper deals with a multi-objective parameter optimization framework for energy saving in injection molding *** combines an experimental design by Taguchi's method,a process analysis by analysis of variance(ANOVA),a process modeling algorithm by artificial neural network(ANN),and a multi-objective parameter optimization algorithm by genetic algorithm(GA)-based lexicographic *** and global Pareto analyses show the trade-off between product quality and energy *** implementation of the proposed framework can reduce the energy consumption significantly in laboratory scale tests,and at the same time,the product quality can meet the pre-determined requirements.

关键词： Injection molding process Energy saving Multi-objective optimization Genetic algorithm Lexicographic method

Solvothermal Synthesis, Structural Characterization and Properties of Two New Layered Lanthanide Sulfates

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Chemical Research in Chinese Universities 2013年第5期29卷 831-836页

作者： lu yun ZHANG Deng XU Yan State Key Laboratory of Materials-oriented Chemical Engineering College of Chemistry and Chemical Engineering Nanjing University of Technology Nanjing 210009 P. R. China

Two new layered lanthanide sulfates, [C10H10N2][Pr2（SO4）4（H2O）2]（1） and [H5O2][Sm（SO4）2（H2O）3]（2） were synthesized via solvothermal reaction and structurally characterized by single-crystal X-ray diffraction（XRD）, infrared（IR） spectroscopy, thermal analysis, fluorescent spectra and inductively coupled plasma（ICP）. Crystal data for compound 1, triclinic, Pi space group, a=0.8052（4） nm, b=0.9438（4） nm, c=1.4990（7） nm, α=79.450（5）°, β= 83.703（5）°, γ=74.048（5）°, V=1.0746（9） nm3, Z=2; for compound 2, monoclinie, P21/c space group, a=0.6599（11） nm, b=1.8940（3） nm, c=0.8765（14） nm, β=96.596（2）°, V=1.0883（3） nm3, Z=4. Structure analysis indicates that both the compounds exhibit a 2D corrugated layer structure, with protonated 4,4＇-bipyridine cations and water dimmers （H5O2）＋ located between the inorganic layers of compounds pounds 1 and 2 were further investigated. 1 and 2, respectively. luminescent properties of com-

关键词： Solvothermal synthesis Open-framework Lanthanide sulfate Layered structure luminescence

Phase transformation and thermal analysis during combustion synthesis of Mg_(17)Al_(12) alloy

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Rare Metals 2014年第1期33卷 37-40页

作者： Yu-Li Zhou yun lu yun-Feng Zhu Li-Quan Li College of Materials Science and Engineering Nanjing University of Technology

The Mg-A1 hydrogen storage alloy was suc- cessfully prepared by combustion synthesis （CS） method. The formation of alloy phases during the CS process was studied using X-ray diffraction （XRD）, scanning electron microscope （SEM）, and differential scanning calorimetry （DSC）. When the time increases from 0, 0.5, 1.0 to 2.0 h at 733 K, the products are Mg and A1; Mg2A13, Mg and A1; Mgl7All2, Mg2A13; and Mg; and eventually only MgI7A112, respectively. Combined with three peaks in the DSC traces, it is concluded that the formation of MglyAll2 during the CS includes three processes, namely, the formation of MgzA13 first; then the unsaturated solid solution, MglvAla2; and finally the complete MglvA112 alloy. The formation of MgzA13 prior to MglvA112 in this work is different from those prepared by mechanical alloying. This is thought to be related to the instant high temperature during the ther- mal explosion of CS.

关键词： Mg-A1 alloy Combustion synthesis Phasetransformation Thermal analysis

A numerical study of fluid injection and mixing under near-critical conditions

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Acta Mechanica Sinica 2012年第3期28卷 559-571页

作者： Hua-Guang Li Xi-yun lu Vigor Yang Department of Modern Mechanics University of Science and Technology of China230026 HefeiChina School of Aerospace Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

Nitrogen injection under conditions close vicinity of the liquid-gas critical point is studied numerically. The fluid thermodynamic and transport properties vary drasti- cally and exhibit anomalies in the near-critical regime. These anomalies can cause distinctive effects on heat-transfer and fluid-flow characteristics. To focus on the influence of ther- modynamics on the flow field, a relatively low injection Reynolds number of 1 750 is adopted. For comparisons, a reference case with the same configuration and Reynolds number is simulated in the ideal gas regime. The model accommodates full conservation laws, real-fluid thermody- namic and transport phenomena. Results reveal that the flow features of the near-critical fluid jet are significantly differ- ent from their counterpart. The near-critical fluid jet spreads faster and mixes more efficiently with the ambient fluid along with a more rapidly development of the vortex pairing pro- cess. Detailed analysis at different streamwise locations in- cluding both the flat shear-layer region and fully developed vortex region reveals the important effect of volume dilata- tion and baroclinic torque in the near-critical fluid case. The former disturbs the shear layer and makes it more unstable. The volume dilatation and baroclinic effects strengthen the vorticity and stimulate the vortex rolling up and pairing pro- cess

关键词： Liquid-gas critical point Real-fluid Fluid in-jection Shear layer instability Vortical dynamics

Spike protein homology between the SARS-associated virus and murine hepatitis virus implies existence of a putative receptor-binding region

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Chinese Science Bulletin 2003年第11期48卷 1115-1117页

作者： lu yun CHEN Yinghua Laboratory of Immunology Department of BiologyProtein Science Laboratory of Ministry of Education Tsinghua University Beijing 100084 China

Coronavirus has been determined to be the cause of the recent outbreak of severe acute respiratory syndrome (SARS). Human coronavirus 229E had been studied well and its receptor-binding domain was restricted to aa417—547 of S protein. However, this region has no homology with the newly separated SARS-associated virus (Hong Kong isolate CUHK-W1). Then we analyzed the phylogenesis of S1 subunit of the coronavirus spike protein (SARS-associated virus, Hong Kong isolate CUHK-W1). Interestingly, the highest homology between murine hepatitis virus (MHV) and SARS-associated coronavirus was found. And the important sites (aa62—65 and aa214—216) on the spike protein of MHV with receptor-binding capacity were highly conservative in comparison with the newly separated SARS-asso- ciated virus (the corresponding sites are aa51—54 and aa195—197). These results from bioinformatics analysis might help us to study the receptor-binding sites of SARS-associ- ated virus and the mechanism of the virus entry into the target cell, and design antiviral drugs and potent vaccines.

关键词：非典型性肺炎冠状病毒鼠类肝炎病毒 SARS 蛋白质抗过滤性病源体药物疫苗异体同形

Nonalcoholic fatty liver disease and cardiovascular disease

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World Journal of Gastroenterology 2014年第26期20卷 8407-8415页

作者： Hong Liu Hong-yun lu Department of Endocrinology and Metabolism the Fifth Affiliated Hospital of Sun Yat-sen University

Nonalcoholic fatty liver disease(NAFLD)and cardiovascular disease(CVD)are two diseases that are common in the general *** date,many studies have been conducted and demonstrate a direct link between NAFLD and CVD,but the exact mechanisms for this complex relationship are not well established.A systematic search of the PubMed database revealed that several common mechanisms are involved in many of the local and systemic manifestations of NAFLD and lead to an increased cardiovascular *** possible mechanisms linking NAFLD and CVD include inflammation,oxidative stress,insulin resistance,ectopic adipose tissue distribution,dyslipidemia,endothelial dysfunction,and adiponectin,among *** clinical implication is that patients with NAFLD are at an increased risk of CVD and should undergo periodic cardiovascular risk assessment.

关键词： Nonalcoholic fatty liver disease Cardiovascular disease Metabolic syndrome Risk assessment

The Effect of Mach Number on Turbulence Behaviors in Compressible Boundary Layers

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Chinese Physics Letters 2011年第6期28卷 190-193页

作者： WANG Li lu Xi-yun Department of Modern Mechanics University of Science and Technology of ChinaHefei 230026

The effects of Mach number on turbulence behaviors are investigated by means of direct numerical simulation of compressible turbulent boundary layers with the free-stream Mach numbers 2,4 and *** typical turbulent quantities,including the velocity and vorticity fluctuations,intermittency,sweep and ejection events and turbulent kinetic energy budget,are *** turbulence intensities are significantly decreased with the increasing Mach *** onset of intrinsic intermittency occurs nearer the wall for a higher Mach *** ejection event is more frequent and the sweep event becomes less ***,the magnitudes of turbulent kinetic energy production,diffusion and transport terms are increased and the solenoidal dissipation is slightly decreased as the Mach number is increased.

关键词： turbulent turbulence quantities

Statistical Analysis of Coherent Vortical Structures in a Supersonic Turbulent Boundary Layer

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Chinese Physics Letters 2011年第3期28卷 124-127页

作者： WANG Li lu Xi-yun Department of Modern Mechanics University of Science and Technology of ChinaHefei 230026

Characteristics of coherent vortical structures in a compressible turbulent boundary layer are statistically analyzed by means or airect numerical simulation of the compressible Navier-Stokes equations for Mach number M=2and Reynolds number Reθ≈1000 based on the inlet momentum *** is found that a large variety of hairpin-like and cane-like vortical structures exist in the boundary layer and the most popular structure is the cane-like *** injection and sweep events contribute a major proportion of the total Reynolds *** study indicates structural similarities with the incompressible ***,the length scales of coherent structures in the streamwise and spanwise directions increase with the distance from the *** inclination angle of vortical structures with respect to the streamwise direction increases from the suboayer to the buffer layer and then decreases from the buffer layer to the wake region.

关键词： coherent Reynolds boundary

Study on the Constitutive Model of Marble Based on the Conventional Triaxial Compression Test

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上海交通大学学报 2004年第Z2期38卷 8-13页

作者： Tian Sheng-li lu yun-de Ge Xiu-run School of Civil Engineering and Mechanics Shanghai Jiaotong University Shanghai200240China School of Civil Engineering and Mechanics Shanghai Jiaotong University Shanghai200240China School of Civil Engineering and Mechanics Shanghai Jiaotong University Shanghai200240China Institute of Rock and Soil Mechanics The Chinese Academy of Sciences Wuhan430071 China

The RMB-150B rock mechanics test system was employed to obtain the complete stress-strain test curves under confining pressures of 0-30MPa for marble samples from Ya'an ,Sichuan province. On the basis of former study and the convention triaxial pressure test results ,the complete procedures curves which described the relationships between yielding strength、 peak strength、 residual strength and confining pressure was obtained. Taking the strain softening of rock into account, the bilinear elastic-linear softening-residual perfect plasticity four-linear model was put forward in this paper on the basis of the test results and theory of plasticity. This model was adopted to describe the behaviors of marble in different phases under triaxial compression with the constitutive equation of strain softening phase as focus. The results indicated that the theoretic model fitted in well with the test results.

关键词： theory of plasticity conventional triaxial compression test constitutive model control equation linear softening bilinear elastic