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An automatic optimization method for minimizing supporting structures in additive manufacturing

Advances in Manufacturing 2020年第1期8卷 49-58页

作者： xiao-jun Chen jun-Lei Hu Qing-Long Zhou Constantinus Politis Yi Sun Institute of Biomedical Manufacturing and Life Quality Engineering State Key Laboratory of Mechanical System and VibrationSchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240P.R.China OMFS-IMPATH Research Group Department of Imaging and PathologyFaculty of MedicineKatholieke Universiteit LeuvenLeuvenBelgium Department of Oral and Maxillofacial Surgery University Hospitals LeuvenLeuvenBelgium

The amount of supporting structure usage has been a major research topic in layer-based additive manufacturing(AM)over the past years as it leads to increased fabrication time and decreased surface *** studies focused on deformation and topology optimization to eliminate the number of support ***,during the actual fabrication process,the properties of shape and topology are ***,they should not be modified *** this study,we present an optimizer that reduces the number of supporting structures by identifying the prime printing *** rotation,models are projected in each direction in space,and the basis units involved in the generation of support structures are ***,the area of the supporting structures is ***,the prime printing direction with minimal supporting area is obtained through pattern-searching *** results of the experiment demonstrated that the printing area was reduced by up to 60%for some cases,and the surface quality was also improved ***,both the material consumption and fabrication time were decreased in most *** future work,additional factors will be considered,such as the height of the supporting S xiao-jun Chen xiaojunchen@*** 1 Institute of Biomedical Manufacturing and Life Quality Engineering,State Key Laboratory of Mechanical System and Vibration,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,*** 2 OMFS-IMPATH Research Group,Department of Imaging and Pathology,Faculty of Medicine,Katholieke Universiteit Leuven,Leuven,Belgium 3 Department of Oral and Maxillofacial Surgery,University Hospitals Leuven,Leuven,Belgium structures and the adhesion locations to improve the efficiency of this optimizer.

关键词： Printing direction Optimization Supporting structures

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Systematic study of the synthesis of heavy and superheavy nuclei in 48Ca-induced fusion-evaporation reactions

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Nuclear Science and Techniques 2024年第7期35卷 157-172页

作者： Shi-Hao Zhu Tian-Liang Zhao xiao-jun Bao Department of Physics Collaborative Innovation Center for Quantum EffectsKey Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of EducationHunan Normal UniversityChangsha410081China School of Nuclear Science and Technology Lanzhou UniversityLanzhou730000China School of Physics Xi’an Jiaotong UniversityXi’an710049China

We systematically studied the evaporation residue cross sections of ^(48)Ca-induced reactions on lanthanide and actinide target nuclei under the Dinuclear System(DNS)model framework to check the reliability and applicability of the *** produce new proton-rich Fl and Lv isotopes through hot fusion reactions in the superheavy element region with Z≥104,we utilized the reactions ^(48)Ca+^(236,238,239) Pu and ^(48)Ca+^(242,243,244,250) ***,owing to the detection limit of available equipment(0.1 pb),only 283Fl and 287−289Lv,which have the maximum evaporation residue cross section values of 0.149,0.130,9.522,and 0.309 pb,respectively,can be ***,to produce neutron-deficient isotopes of actinides near the proton drip line with Z=93−100,we attempted to generate the new isotopes(224−227Pu,228−232,237Cm)using the reactions ^(48)Ca+180,182,183 W and ^(48)Ca+^(184,186,187,192) *** maximum evaporation residue cross section values are 0.07,0.06,0.26,and 0.30 nb for the former set of reactions,and 1.96 pb,5.73 pb,12.16 pb,19.39 pb,54.79 pb,and 6.45 nb for the latter,*** results are expected to provide new information for the future synthesis of unknown neutron-deficient isotopes.

关键词： Dinuclear system(DNS)model Evaporation residue cross section Neutron-deficient isotopes

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Effect of detrapping on up-conversion charging in LaMgGa_(11)O_(19):Pr^(3+) persistent phosphor

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Journal of Rare Earths 2021年第12期39卷 1492-1496,I0002页

作者： Xiyu Zhao Chenlin Li Feng Liu xiao-jun Wang Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education Northeast Normal UniversityChangchun 130024China Department of Physics Georgia Southern UniversityStatesboroGA30460USA

Up-conversion charging(UCC)is a promising approach for charging storage phosphors using low-energy excitation light *** further understanding the UCC,research on the competition between trapping and detrapping during illumination is essentially *** we demonstrate the effect of detrapping on UCC dynamics by a rate equation ***,taking LaMgGa_(11)O_(19):Pr^(^(3+))phosphor as an example,we experimentally verified the dependence of illumination dose and duration on the thermoluminescence intensities using 450 nm laser *** present model and experimental approach appear to be transferable to other phosphors,Thus,many existing persistent phosphors can now be revisited,paving the way toward advancing the understanding of UCC.

关键词： Up-conversion charging Pr^(3+)ion Detrapping Rate equation Thermolumineseence Rare earths

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The two-body hadronic decays of B_c meson in the perturbative QCD approach:a short review

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Chinese Science Bulletin 2014年第29期59卷 3748-3759页

作者： Zhen-jun xiao Xin Liu Department of Physics and Institute of Theoretical Physics Nanjing Normal University Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University School of Physics and Electronic Engineering Jiangsu Normal University

Along with the running of Large Hadron Collider(LHC)located at CERN in November 2009,a large number of data samples of Bc meson have been collected and some hadronic Bc decay modes have been measured by the LHC *** view of the special and important roles of Bc meson decays playing in the heavy flavor sector,we here give a short review on the status of two body hadronic decays Bc!M1M2at both experimental and theoretical *** the theoretical progresses,specifically,we will show lots of theoretical studies on two body hadronic Bcdecays involving pseudoscalar,vector,scalar,axial-vector,even tensor meson(s)in the final states by employing the perturbative QCD(pQCD)factorization *** will present a general analysis about the twobody hadronic decays of the heavy Bc meson and also provide some expectations for the future developments.

关键词：微扰QCD 强子衰变介子评论欧洲核子研究中心大型强子对撞机实验测量衰减模式

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Task mapper and application-aware virtual machine scheduler oriented for parallel computing

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第3期13卷 155-177页

作者： Jing ZHANG xiao-jun CHEN jun-huai LI Xiang LI School of Computer Science and Engmeering Xi'an University of TechnologyXi'an 710048China State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong UniversityXi'an 710048China

We design a task mapper TPCM for assigning tasks to virtual machines, and an application-aware virtual machine scheduler TPCS oriented for parallel computing to achieve a high performance in virtual computing systems. To solve the problem of mapping tasks to virtual machines, a virtual machine mapping algorithm (VMMA) in TPCM is presented to achieve load balance in a cluster. Based on such mapping results, TPCS is constructed including three components: a middleware supporting an application-driven scheduling, a device driver in the guest OS kernel, and a virtual machine scheduling algorithm. These components are implemented in the user space, guest OS, and the CPU virtualization subsystem of the Xen hypervisor, respectively. In TPCS, the progress statuses of tasks are transmitted to the underlying kernel from the user space, thus enabling virtual machine scheduling policy to schedule based on the progress of tasks. This policy aims to exchange completion time of tasks for resource utilization. Experimental results show that TPCM can mine the parallelism among tasks to implement the mapping from tasks to virtual machines based on the relations among subtasks. The TPCS scheduler can complete the tasks in a shorter time than can Credit and other schedulers, because it uses task progress to ensure that the tasks in virtual machines complete simultaneously, thereby reducing the time spent in pending, synchronization, communication, and switching. Therefore, parallel tasks can collaborate with each other to achieve higher resource utilization and lower overheads. We conclude that the TPCS scheduler can overcome the shortcomings of present algorithms in perceiving the progress of tasks, making it better than schedulers currently used in parallel computing.

关键词： Virtual machine Virtualization Application-aware Parallel computing Virtual machine mapping Credit algorithm Virtual machine scheduling

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Oscillation in the KMnO₄-NH₂CH₂COOH CSTR System

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Chinese Chemical Letters 1996年第10期7卷 928-930页

作者： Li, He Xing Huang, xiao jun Department of Chemistty Shanghai Normal University Shanghai 200234

The chemical oscillating reactions in KMnO4-NH2CH2COOH-H3PO CSTR system in the presence and absence of Ag+ have been *** reaction conditions and phase diagrams have been determined. Some effects on the oscillation have then studied. The stabilization of colloidal particles of MnO2 by PO43-has been investigated. The roles of Ag+ in the above reactions have also been studied.

关键词： CH NH Oscillation in the KMnO4-NH2CH2COOH CSTR System CSTR

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Investigation on Transmission Properties of Terahertz Wave Through Semiconductor Aperture

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Communications in Theoretical Physics 2008年第2期49卷 485-488页

作者： HE xiao-Yong CAO jun-Cheng State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology the Chinese Academy of Sciences Shanghai 200050 China

The transmission properties of terahertz （THz） wave passing through semiconductor aperture have been investigated. The dispersion relationship for surface plasmon polariton （SPP） at different temperatures has been numerically calculated. The results show that the dispersion relationship increases with the increasing of frequency and the decreasing of temperature, the thickness of slab has to be taken into consideration because of the large skin depth for semiconductor slab. In addition, the propagation constant increases with the increasing of frequency and the decreasing of temperature.

关键词： terahertz surface plasmon propagation constant

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A novel block encryption scheme based on chaos and an S-box for wireless sensor networks

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Chinese Physics B 2012年第2期21卷 163-174页

作者： Tong xiao-jun Wang Zhu Zuo Ke School of Computer Science and Technology Harbin Institute of TechnologyWeihai 264209China School of Information Technology and Engineering Harbin Institute of TechnologyWeihai 264209China

The wireless sensor network （WSN） has been widely used in various fields, but it still remains in the preliminary discovery and research phase with a lack of various related mature technologies. Traditional encryption schemes are not suitable for wireless sensor networks due to intrinsic features of the nodes such as low energy, limited computation capability, and lack of storage resources. In this paper, we present a novel block encryption scheme based on the integer discretization of a chaotic map, the Feistel network structure, and an S-box. The novel scheme is fast, secure, has low resource consumption and is suitable for wireless sensor network node encryption schemes. The experimental tests are carried out with detailed analysis, showing that the novel block algorithm has a large key space, very good diffusion and disruptive performances, a strict avalanche effect, excellent statistical balance, and fast encryption speed. These features enable the encryption scheme to pass the SP800-22 test. Meanwhile, the analysis and the testing of speed, time, and storage space on the simulator platform show that this new encryption scheme is well able to hide data information in wireless sensor networks.

关键词： wireless sensor networks chaos encryption discretization of chaotic equations S-box

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APPLICATION OF WEIGHTED NONOSCILLATORY AND NON-FREE-PARAMETER DISSIPATION DIFFERENCE SCHEME IN CALCULATING THE FLOW OF VIBRATING FLAT CASCADE

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Chinese Journal of Mechanical Engineering 2007年第6期20卷 69-73页

作者： xiao jun GU Chuangang SHU Xinwei Key Laboratory for Power Machinery and Engineering Ministry of Education Shanghai Jiaotong University Shanghai 200030 China

A dual-time method is introduced to calculate the unsteady flow in a certain vibrating flat cascade. An implicit lower-upper symmetric-gauss-seidel scheme（LU-SGS） is applied for time stepping in pseudo time domains, and the convection items are discretized with the spatial three-order weighted non-oscillatory and non-free-parameter dissipation difference （WNND） scheme. The turbulence model adopts q-co low-Reynolds-number model. The frequency specmuns of lift coefficients and the unsteady pressure-difference coefficients at different spanwise heights as well as the entropy contours at blade tips on different vibrating instants, are obtained. By the analysis of frequency specmuns of lift coefficients at three spanwise heights, it is considered that there exist obvious non-linear perturbations in the flow induced by the vibrating, and the perturbation frequencies are higher than the basic frequency. The entropy contours at blade tips at different times display an intensively unsteady attribute of the flow under large amplitudes.

关键词： Vibrating cascade Weighted non-oscillatory and non-free-parameter dissipation difference scheme Frequency spectrum of lift coefficient Unsteady pressure-difference coefficient

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Drying and preheating processes of iron ore pellets in a traveling grate

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International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 535-540页

作者： jun-xiao Feng Yu Zhang Hai-wei Zheng xiao-yan Xie Cai Zhang School of Mechanical Engineering University of Science and Technology B~ijing Beijing 100083 China

A mathematical model of drying and preheating processes in a traveling grate was presented based on the laws of mass, momen- tum, heat transfer, and drying semiempirical relations. A field test was systematically carried out in a traveling grate. The effects of pellet diameter, moisture, grate velocity, and inlet gas temperature on the pellet bed temperature were studied. The average relative error between actual measurements and simulations is less than 7.97%, indicating the validity of the model.

关键词： iron ores pelletizing drying preheating numerical methods field test

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