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geometrically constrained isogeometric parameterizedlevel-set based topology optimization via trimmed elements

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Frontiers of Mechanical Engineering 2016年第4期11卷 328-343页

作者： Yingjun WANg David j. benson School of Mechanical and Automotive Engineering South China University of Technology Guangzhou 510641 China Department ofMechanical Engineering McGill University Montreal H3AOC3 Canada Department of Structural Engineering University of California SanDiego 92093 USA

In this paper, an approach based on the fast point-in-polygon (PIP) algorithm and trimmed elements is proposed for isogeometric topology optimization (TO) with arbitrary geometric constraints. The isogeometric parameterized level-set-based TO method, which directly uses the non-uniform rational basis splines (NURBS) for both level set function (LSF) parameterization and objective function calculation, provides higher accuracy and efficiency than previous methods. The integration of trimmed elements is completed by the efficient quadrature rule that can design the quadrature points and weights for arbitrary geometric shape. Numerical examples demonstrate the efficiency and flexibility of the method.

关键词： isogeometric analysis topology optimization level set method arbitrary geometric constraint trimmed element

Introduction to the Special Issue on Recent Developments of Isogeometric Analysis and Its Applications in Structural Optimization

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Computer Modeling in Engineering & Sciences 2020年第9期124卷 783-785页

作者： Yingjun Wang Zhenpei Wang Xiaowei Deng David j.benson Damiano Pasini Shuting Wang School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou510641China Institute of High Performance Computing(IHPC) Agency for ScienceTechnology and Research(A*STAR)138632Singapore Department of Civil Engineering The University of Hong KongHong Kong999077China Department of Structural Engineering University of CaliforniaSan DiegoLa JollaCA92093USA Department of Mechanical Engineering McGill UniversityMontrealQCH3A0C3Canada School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan430074China

Isogeometric analysis(IgA),which aims at integrating CAD and CAE models,is one of the most active research topics in both computational mechanics and computer-aided geometric *** rapidly growing interests in IgA has led to profound developments of relevant theories and applications,one of which being structural *** the rapid growth of researches in IgA,this special issue contributes to highlight recent developments,challenges and opportunities of IgA and IgA-based structural design optimization,with focuses on theory development,numerical implementations and potential applications.

关键词： optimization computer geometric

Current and Future Treatment of Hepatocellular Carcinoma:An Updated Comprehensive Review

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journal of Clinical and Translational Hepatology 2018年第1期6卷 69-78页

作者： Saleh Daher Muhammad Massarwa Ariel A. benson Tawfik Khoury gastroenterology and Liver Units Department of MedicineHadassah-Hebrew University Medical CenterJerusalemIsrael

Hepatocellular carcinoma(HCC)is among the leading causes of cancer-related *** principal treatment is surgical resection or liver transplantation,depending on whether the patient is a suitable transplant ***,in most patients with HCC the diagnosis is often late,thereby excluding the patients from definitive surgical *** treatment includes sorafenib,which is the most commonly used systemic therapy;although,it has been shown to only minimally impact patient survival by several *** and radiotherapy are generally *** to the poor prognosis of patients with HCC,newer treatments are needed with several being in development,either in preclinical or clinical *** this review article,we provide an update on the current and future medical and surgical management of HCC.

关键词： HCC Treatments Sorafenib Mortality

Controllable Fabrication of Spider-Web-Like Structured Anaphe Panda Regenerated Silk Nanofibers / Nets via Electrospinning / Netting

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journal of Donghua University(English Edition) 2014年第4期31卷 497-502页

作者： DULO benson 王娜李彦 OYONDI Erick MADARA S Diana 丁彬 College of Textiles Donghua University Department of Manufacturing Industrial and Textile EngineeringMoi University State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University

An Anaphe panda silk nanofibers / nets( NFN) membrane with attractive structures consisting of common electrospun nanofibers and two-dimensional( 2D) spider-web-like structured nano-nets were successfully fabricated via electrospinning / netting technology. The unique structures of NFN membranes such as extremely small diameter( gh porosity,large specific surface area. and biocompatibility make this Anaphe panda silk NFN membrane a promising candidate for biomedical applications. In the present study, field emission scanning electron microscopy( FESEM) was used to investigate the influence of polymer solution and humidity on nano-nets coverage and morphology. The FE-SEM images revealed that nano-net coverage area increased with increase in concentration of solution while lowering the humidity increased the nano-nets formation. Moreover,the mechanical properties of the membrane were also tested and the result showed that the silk NFN membrane displayed a breaking stress of 3. 7 MPa and breaking strain of 13. 8%. For further structural elucidation, Fourier transform infrared spectroscopy( FT-IR) was used to analyze the structural conformation changes from random coil to β-sheet in the NFN membrane which was an important factor effecting the usability of membrane. Thus,the results above confirmed the feasibility of Anaphe panda NFN structures applicability in cell tissue culture and other biomedical applications.

关键词： Anaphe panda silk electrospinning / netting nanofibers / nets(NFN) biocompatibility

Spatiotemporal modeling of mid-infrared photoluminescence from terbium(Ⅲ) ion doped chalcogenide-selenide multimode fibers

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journal of Rare Earths 2019年第11期37卷 1157-1163页

作者： Slawomir Sujecki Lukasz Sojka Zhuoqi Tang Dinuka jayasuriya David Furniss Emma Barney Trevor benson Angela Seddon Telecommunications and Teleinformatics Department Wroclaw University of Science and TechnologyWroclawPoland Mid-Infrared Photonics group George Green Institute for Electromagnetics ResearchFaculty of EngineeringThe University of NottinghamNottinghamUK

A numerical model was developed to study the time dynamics of photo luminescence emitted by Tb^3+doped multimode chalcogenide-selenide glass fibers pumped by laser light at approximately 2μ*** model consists of a set of partial differential equations(PDEs),which describe the temporal and spatial evolution of the photon density and level populations within the *** order to solve numerically the PDEs a method of lines was *** modeling parameters were extracted from measurements and from data available in the *** numerical results obtained support experimental *** particular,the developed model reproduces the discrepancies that are observed between the photoluminescence decay curves obtained from different points along the *** numerical analysis was also used to explain the source of these discrepancies.

关键词： Chalcogenide glass fiber Numerical modeling Photoluminescence Mid-infrared light Rare earths

Multi-Material ALE with AMR for Modeling Hot Plasmas and Cold Fragmenting Materials

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Plasma Science and Technology 2015年第2期17卷 117-128页

作者： Alice KONIgES Nathan MASTERS Aaron FISHER David EDER Wangyi LIU Robert ANDERSON David benson Andrea BERTOZZI Lawrence Berkeley National Laboratory Lawrence Livermore National Laboratory jacobs School of Engineering 9500 Gilman Dr.UCSDLa JollaCA 92093USA Department of Mathematics 520 Portola PlazaUCLALos AngelesCA 90095USA

We have developed a new 3D multi-physics multi-material code, ALE-AMR, which combines Arbitrary Lagrangian Eulerian （ALE） hydrodynamics with Adaptive Mesh Refinement （AMR） to connect the continuum to the microstructural regimes. The code is unique in its ability to model hot radiating plasmas and cold fragmenting solids. New numerical techniques were developed for many of the physics packages to work efficiently on a dynamically moving and adapting mesh. We use interface reconstruction based on volume fractions of the material components within mixed zones and reconstruct interfaces as needed. This interface reconstruction model is also used for void coalescence and fragmentation. A flexible strength/failure framework allows for pluggable material models, which may require material history arrays to determine the level of accumulated damage or the evolving yield stress in j2 plasticity models. For some applications laser rays are propagating through a virtual composite mesh consisting of the finest resolution representation of the modeled space. A new 2nd order accurate diffusion solver has been implemented for the thermal conduction and radiation transport packages. One application area is the modeling of laser/target effects including debris/shrapnel generation. Other application areas include warm dense matter, EUV lithography, and material wall interactions for fusion devices.

关键词： multi-physics simulations arbitrary lagrangian eulerian hydrodynamics,adaptive mesh refinement fragmentation laser ray tracing NIF

A generalized synthesis method for freestanding multiferroic twodimensional layered supercell oxide films via a sacrificial buffer layer

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Nano Research 2023年第7期16卷 10559-10566页

作者： jianan Shen benson Kunhung Tsai Ke Xu Anyu Shang james PBarnard Yizhi Zhang Rahul Tripathi Zhihong Chen Xinghang Zhang Haiyan Wang School of Materials Engineering Purdue UniversityWest LafayetteIndiana 47907USA Elmore Family School of Electrical and Computer Engineering Purdue UniversityWest LafayetteIndiana 47907USA Birck Nanotechnology Center Purdue UniversityWest LafayetteIndiana 47907USA

Multiferroics are an intriguing family of materials due to the simultaneous presence of two ferroic orderings,namely,ferroelectricity and *** are scientifically and technologically important and have numerous potential applications,such as four-state logic memories and multiferroic tunneling ***,the growth of epitaxial singlephase multiferroic thin films typically requires single crystalline oxide substrates,which hinders their future integration with Sibased *** this study,we report a generalized synthesis method that uses the polydimethylsiloxane(PDMS)-assisted wetetching method with an Sr_(3)Al_(2)O_(6)(SAO)sacrificial layer to transfer freestanding single-phase multiferroic Bi_(2)NiMnO_(6)(BNMO)films from conventional SrTiO_(3)(STO)substrates onto a Si *** structures and properties of the films have been characterized before and after the *** transferred films possess good multiferroic properties on Si wafers,indicating full compatibility with modern Si *** method can be generally applicable to other Bi-based multiferroic materials as ***,the original STO substrates after the transfer process have been recycled for preparing new batches of freestanding BNMO films,indicating a low-cost and sustainable method for manufacturing large-volume freestanding complex oxide thin films.

关键词： multiferroics freestanding films wet-transfer SAO sacrificial layer recyclable substrates sustainable

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现场条件下猪的麻醉

中国畜牧兽医 1982年第1期 61-62页

作者：全炳昭 benson,g.j.

在现场条件下对猪施行手术,需要使用可靠而经济的麻醉药物和技术,却不能要求使用昂贵而笨重的设备.为有效地完成手术,麻醉剂应能起到充分松弛肌肉、麻醉和镇痛作用.由于在农场进行的手术过程多半都较短,故适于使用注射药剂.由于猪的生... 详细信息

在现场条件下对猪施行手术,需要使用可靠而经济的麻醉药物和技术,却不能要求使用昂贵而笨重的设备.为有效地完成手术,麻醉剂应能起到充分松弛肌肉、麻醉和镇痛作用.由于在农场进行的手术过程多半都较短,故适于使用注射药剂.由于猪的生理特征和体温缘故致使其诱导全身麻醉往往较为困难.猪只

关键词：麻醉药物肌肉注射肌内注射氯胺酮解热镇痛药芬太尼肌肉松弛呼吸抑制巴比妥酸盐戊巴比妥颠茄碱阿托品昔罗卡因抗心律失常药利多卡因肌注前驱麻醉外科手术镇静药巴比妥类总剂量

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非相干变频转换实现室温下红外单光子源

红外与激光工程 2014年第11期43卷 3709-3712页

作者：江萍郭蒙蒙 Tim Schroeder Oliver benson 中国石油大学(华东)理学院山东青岛266580 Institute for Physics Humboldt-Universitat Zu BerlinBerlin Germany 10245

纳米金刚石中的NV-center(Nitrogen-Vacancy center)是目前室温下具有高发射率和稳定性的可见光波段单光子源,而如何实现及优化红外单光子源则是未来实现量子信息和量子通信应用的一大挑战。介绍了一种近期提出的实现红外单光子源的新... 详细信息

纳米金刚石中的NV-center(Nitrogen-Vacancy center)是目前室温下具有高发射率和稳定性的可见光波段单光子源,而如何实现及优化红外单光子源则是未来实现量子信息和量子通信应用的一大挑战。介绍了一种近期提出的实现红外单光子源的新型机制。该方法以金刚石中的NV-center作为可见光波段的单光子源,利用非相干变频转换实现室温下近红外波段稳定、无闪烁的单光子源。具体的实施方案为在中空芯光子晶体光纤中选择性地填充含有量子点的溶液,以可见光波段的单光子源作为激励源,选择合适的量子点即可得到红外波段的单光子源。中空芯光子晶体光纤保证了较高的单光子吸收效率以及荧光收集效率。该方案的实施在理论上可以达到26%的转换效率,而初步的实验得到了0.1%的转换效率。进一步分析了一些影响转换效率的因素,并提出了一些解决方案。

关键词：单光子源红外中空芯光子晶体光纤