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Support-free interior carving for 3D printing

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Visual Informatics 2017年第1期1卷 9-15页

作者： yue xie Xiang Chen State Key Lab of CAD&CG Zhejiang UniversityHangzhou 310058China

Recent interior carving methods for functional design necessitate a cumbersome cut-and-glue process in *** a method to generate interior voids which not only satisfy the functional purposes but are also support-free during the 3D printing *** introduce a support-free unit structure for voxelization and derive the wall thicknesses parametrization for continuous *** design a discrete dithering algorithm to ensure the printability of ghost *** interior voids are iteratively carved by alternating the optimization and *** apply our method to optimize the static and rotational stability,and print various results to evaluate the efficacy.

关键词： Interior carving Support-free Voxels dithering Shape optimization 3D printing

Hinge Majorana flat band in type-Ⅱ Dirac semimetals

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Science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 127-132页

作者： yue xie Xianxin Wu Zhong Fang Zhijun Wang Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing100190China

Type-Ⅱ Dirac semimetals exhibit a unique Fermi surface topology,which allows them to host novel topological superconductivity(TSC).We reveal a novel inter-orbital superconducting state,corresponding to the B_(1u) and B_(2u) pairings under the D_(4h) point ***,we find that both first-and second-order TSC coexist in this novel *** is induced by a dominant inter-orbital attraction and possesses surface helical Majorana cones and hinge Majorana flat bands,spanning the entire z-directed hinge Brillouin *** investigation uncovers that these higher-order hinge modes are robust against the C_(4z) symmetry-breaking perturbation.

关键词： topological superconductivity Majorana fermions higher-order topology type-II Dirac semimetals

Continuous optimization of interior carving in 3D fabrication

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Frontiers of Computer Science 2017年第2期11卷 332-346页

作者： yue xie Ye YUAN Xiang CHE Changxi ZHENG Kun ZHOU State Key Lab of CAD&CG Zhejiang University Hangzhou 310058 China Columbia University New York NY 10027 USA

In this paper we propose an optimization frame- work for interior carving of 3D fabricated shapes. Interior carving is an important technique widely used in industrial and artistic designs to achieve functional purposes by hollow- ing interior shapes in objects. We formulate such functional purpose as the objective function of an optimization prob- lem whose solution indicates the optimal interior shape. In contrast to previous volumetric methods, we directly repre- sent the boundary of the interior shape as a triangular mesh. We use Eulerian semiderivative to relate the time derivative of the object function to a virtual velocity field and iteratively evolve the interior shape guided by the velocity field with sur- face tracking. In each iteration, we compute the velocity field guaranteeing the decrease of objective function by solving a linear programming problem. We demonstrate this general framework in a novel application of designing objects float- hag in fluid and two previously investigated applications, and print various optimized objects to verify its effectiveness.

关键词： computer graphics 3D printing interior carving shape optimization Eulerian semiderivative

Particle Shape Dependence of Rheological Behavior for Colloid-polymer Mixtures

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Chinese Journal of Polymer Science 2014年第11期32卷 1515-1523页

作者： Lei Ye yue xie 邱东 Ying Kan 张正东 Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics and ChemistryInstitute of ChemistryChinese Academy of Sciences National Institute of Metrology

The effect of particle shape on the rheological behavior of small particle-large polymer chain mixture solutions has been investigated with two model colloidal silica dispersions, one of which is ellipsoidal（BINDZIL20/440） and the other is spherical（TM40）. It was found that BINDZIL20/440 series showed shear-thickening at lower shear rates and had a lower upper limit in PEO concentration to demonstrate shear-thickening phenomena. The particle shape was identified as the major factor accounting for these differences. This work enables one to control the rheological behavior of colloid-polymer mixture through simply changing particle geometry instead of performing surface modifications, which could be especially useful in cases where only certain chemicals are allowed, for example in vivo applications.

关键词： Silica colloid Rheology Nanoparticle PEO.

Preparation of Zn-doped TiO_2 nanotubes electrode and its application in pentachlorophenol photoelectrocatalytic degradation

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Chinese Science Bulletin 2007年第11期52卷 1456-1461页

作者： ZHAO HuiMin CHEN yue QUAN xie RUAN XiuLi Key Laboratory of Industrial Ecology and Environmental Engineering Ministry of Education School of Environmental and BiologicalScience and Technology Dalian University of Technology Dalian 116024 China

Zn-doped titanium oxide (TiO2) nanotubes electrode was prepared on a titanium plate by direct anodic oxidation and immersing method in sequence. Field emission scanning electron microscopy (FESEM) showed that the Zn-doped TiO2 nanotubes were well aligned and organized into high density uniform arrays with diameter ranging from 50 to 90 nm. The length and the thickness were about 200 and 15 nm respectively. TiO2 anatase phase was identified by X-ray diffraction (XRD). X-ray photoelectronspec-troscopy (XPS) indicated that Zn ions were mainly located on the surface of TiO2 nanotubes in form of ZnO clusters. Compared with TiO2 nanotubes electrode,about 20 nm red shift in the spectrum of UV-vis absorption was observed. The degradation of pentachlorophenol (PCP) in aqueous solution under the same condition (initial concentration of PCP: 20 mg/L; concentration of Na2SO4: 0.01 mol/L and pH: 7.03) was carried out using Zn-doped TiO2 nanotubes electrode and TiO2 nanotubes electrode. The degradation rates of PCP using Zn-doped TiO2 nanotubes electrode were found to be twice and 5.8 times as high as that using TiO2 nanotubes electrode by UV radiation (400 μw/cm2) and visible light radiation (4500 μw/cm2),respectively. 73.5% of PCP was removed using Zn-doped TiO2 nanotubes electrode against 48.5% removed using TiO2 nanotubes electrode in 120 min under UV radiation. While under visible light radiation,the degradation efficiency of PCP was 18.4% using Zn-doped TiO2 nano-tubes electrode against 3.2% using TiO2 nanotubes electrode in 120 min. The optimum concentration of Zn doping was found to be 0.909%. The PCP degradation efficiencies of the 10 repeated experiments by Zn-doped TiO2 nanotubes electrode were rather stable with the deviation within 3.0%.

关键词： TiO2 电极杂质锌光电接触五氯苯酚

Extended activated sludge model no. 1 (ASM1) for simulating biodegradation process using bacterial technology

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Water Science and Engineering 2012年第3期5卷 278-290页

作者： Ya-jing SONG yue-bo xie Doddi YUDIANTO College of Hydrology and Water Resources Hohai University Nanjing 210098 P. R. China Civil Engineering Department Parahyangan Catholic University West Java 112548 Indonesia

Phosphorus is one of the most important nutrients required to support various kinds of biodegradation processes. As this particular nutrient is not included in the activated sludge model no. 1 （ASM1）, this study extended this model in order to determine the fate of phosphorus during the biodegradation processes. When some of the kinetics parameters are modified using observed data from the restoration project of the Xuxi River in Wuxi City, China, from August 25 to 31 in 2009, the extended model shows excellent results. In order to obtain optimum values of coefficients of nitrogen and phosphorus, the mass fraction method was used to ensure that the final results were reasonable and practically relevant. The temporal distribution of the data calculated with the extended ASM1 approximates that of the observed data.

关键词： stream restoration," bacterial technology," extended activated sludge model no. 1(ASM1) mass fraction," Xuxi River

Experimental study on anti-penetration mechanism of bolted composite protective structure with limited span under impact of low-velocity projectile

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Defence Technology（防务技术） 2022年第6期18卷 995-1005页

作者： Yu-jia Liu Dian Li Hai-liang Hou Zhu-jie Zhao yue xie College of Naval Architecture and Ocean Engineering Naval University of EngineeringWuhan430033China

In order to study the influence of the bolt joint mode on low-velocity projectiles penetrating the composite protective structure,two bolt joint models which connect the composite target to the fixed frame were designed,the ballistic test of the bolted composite protective structure with limited span was carried out,and the bearing and failure characteristics of the bolted region,as well as the energy dissipation of each part of the structure,were *** results show that in the condition of lowvelocity impact,there are three failure modes for the bolted composite protective structure subjected to projectile penetration,including failure of the impact point of the composite target,failure of protective structure connecting components and failure of the holes in the bolted region of the composite target;the failure mode of bolt holes in the bolted region has a great influence on the protection performance,and the allowable value of the bearing capacity of the bolted region depends on the sum of the minimum failure load in the failure modes and the friction force;shear-out failure occurring in the bolt holes in the bolted region exerts the greatest effect on ballistic performance,which should be avoided;When simultaneous failure occurs in the bolted region and the free deformation region of the composite protective structure,the energy absorption per unit surface density of the composite protective structure reaches the maximum,which can give full play to its anti-penetration efficiency.

关键词： Impact dynamics Composite protective structure Bolt joint Ballistic test Failure modes

New Technique:Sketch-based rotation editing

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第11期12卷 867-872页

作者： yue xie Wei-wei XU Yi-zhou YU Yan-lin WENG School of Computer Science and Technology Zhejiang University Hangzhou 310027 China Internet Graphics Group Microsoft Research Asia Beijing 100190 China Department of Computer Science University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA

We present a sketch-based rotation editing mations. Given a set of keyframe orientations of a rigid system for enriching rotational motion in keyframe ani- object, the user first edits its angular velocity trajectory by sketching curves, and then the system computes the altered rotational motion by solving a variational curve fitting problem. The solved rotational motion not only satisfies the orientation constraints at the keyframes, but also fits well the user-specified angular velocity trajectory. Our system is simple and easy to use. We demonstrate its usefulness by adding interesting and realistic rotational details to several keyframe animations.

关键词： Quaternions Keyframe interpolation Animation editing

Dynamic ageing research of cross‐linked polyethylene cable insulation based on temporal‐spatial dimension under combined electro‐thermal effect

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High Voltage 2023年第5期8卷 1067-1081页

作者： Yifeng Zhao yue xie Yu Zhao Jiasheng Huang Xinghui Fan Yangyang Nie Gang Liu School of Electric Power Engineering South China University of TechnologyGuangzhouChina School of Automation Guangdong Polytechnic Normal UniversityGuangzhouChina State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment ShenzhenChina Transmission Management Office Guangzhou Power Supply BureauGuangzhouChina

Dynamic ageing process of cross‐linked polyethylene(XLPE)cable insulation under combined electro‐thermal effect is investigated by the construction of theoretical analysis model and the practice of operation‐simulated ageing ***,theoretical analysis model is constructed from time and spatial *** the time dimension,in the light of the impeding trend of internal stress to external stress,the XLPE ageing process of Steady state‐Transition state‐Steady state(STS)is proposed to illustrate the dynamic ageing process of *** the spatial dimension,the insulation is divided into three scales to quantify the ***,to practice the theoretical analysis model,an operation‐simulated ageing test was conducted on two high voltage alternating current cables with service years of 15 and 30 for 540 ***,relevant diagnostic measurements were applied to analyse the influence of physicochemical characteristics on the dielectric and heat transfer performances of the *** results show that the degradation of the actual operating cable is an extremely slow *** the one hand,the response in physical changes of morphology counterbalances the external stress,maintaining the *** the other hand,once the chemical changes occur,negative feedback mechanism tends to impede the occurrence of further degradation by regulating fields distribution.

关键词： dimension insulation effect