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Brillouin Klein space and half-turn space in three-dimensional acoustic crystals

Science Bulletin 2024年第13期69卷 2050-2058页

作者： Zhenxiao Zhu Linyun Yang jien wu Yan Meng Xiang Xi Bei Yan Jingming Chen Jiuyang Lu Xueqin Huang Weiyin Deng Ce Shang Perry Ping Shum Yihao Yang Hongsheng Chen Kexin Xiang Gui-Geng Liu Zhengyou Liu Zhen Gao State Key Laboratory of Optical Fiber and Cable Manufacture Technology Department of Electronic and Electrical EngineeringSouthern University of Science and TechnologyShenzhen 518055China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China Key Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology Wuhan UniversityWuhan 430072China King Abdullah University of Science and Technology(KAUST) Physical Science and Engineering Division(PSE)Thuwal 23955-6900Saudi Arabia Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationZJU-Hangzhou Global Science and Technology Innovation CenterCollege of Information Science and Electronic EngineeringZJU-UIUC InstituteZhejiang UniversityHangzhou 310027China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore Institute for Advanced Studies Wuhan UniversityWuhan 430072China

The Bloch band theory and Brillouin zone(BZ)that characterize wave-like behaviors in periodic mediums are two cornerstones of contemporary physics,ranging from condensed matter to topological *** theoretical breakthrough revealed that,under the projective symmetry algebra enforced by artificial gauge fields,the usual two-dimensional(2D)BZ(orientable Brillouin two-torus)can be fundamentally modified to a non-orientable Brillouin Klein bottle with radically distinct manifold ***,the physical consequence of artificial gauge fields on the more general three-dimensional(3D)BZ(orientable Brillouin three-torus)was so far ***,we theoretically discovered and experimentally observed that the fundamental domain and topology of the usual 3D BZ can be reduced to a non-orientable Brillouin Klein space or an orientable Brillouin half-turn space in a 3D acoustic crystal with artificial gauge *** experimentally identify peculiar 3D momentum-space non-symmorphic screw rotation and glide reflection symmetries in the measured band ***,we experimentally demonstrate a novel stacked weak Klein bottle insulator featuring a nonzero Z2 topological invariant and self-collimated topological surface states at two opposite surfaces related by a nonlocal twist,radically distinct from all previous 3D topological *** discovery not only fundamentally modifies the fundamental domain and topology of 3D BZ,but also opens the door towards a wealth of previously overlooked momentum-space multidimensional manifold topologies and novel gaugesymmetry-enriched topological physics and robust acoustic wave manipulations beyond the existing paradigms.

关键词： Momentum-space non-symmorphic symmetry Brillouin Klein space and half-turn space Acoustic Klein bottle insulator Self-collimated topological surface states

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浅谈微型车白车身门盖匹配及问题解决

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时代汽车 2020年第14期 169-173页

作者：武继恩陈世坤上汽通用五菱汽车股份有限公司青岛分公司山东省青岛市266555

车身外部匹配问题主要涉及前脸、尾部和侧面(门与门、门与侧围)的匹配,本文主要讨论微型车五门一盖的外部配合问题,微型车的五门一盖通常指左右前门、左右后侧门、尾门和发动机盖板;常见的匹配问题有间隙小干涉、左右差异、段差及特征... 详细信息

车身外部匹配问题主要涉及前脸、尾部和侧面(门与门、门与侧围)的匹配,本文主要讨论微型车五门一盖的外部配合问题,微型车的五门一盖通常指左右前门、左右后侧门、尾门和发动机盖板;常见的匹配问题有间隙小干涉、左右差异、段差及特征线相互位置差异(腰线不齐)等,本文简要说明了五门一盖的位置关系、新产品匹配的注意事项及案例分析。

关键词：五门一盖间隙段差特征线相互位置

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压电声子晶体能带结构的有限元方法模拟

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吉首大学学报（自然科学版） 2018年第3期39卷 31-34页

作者：吴吉恩胡瑞霞邓科吉首大学物理与机电工程学院湖南吉首416000

基于有限元软件COMSOL Multiphysics详细介绍了压电声子晶体能带结构的计算方法,讨论了压电材料中不同分流电路对压电声子晶体能带结构的影响,分析了在能带计算过程中容易出现的几种错误,并给出相应的解决方法.

关键词：压电声子晶体分流电路能带结构 COMSOL Multiphysics

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凉山州15种主要经济树种的防火性能

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应用生态学报 2024年第1期35卷 203-211页

作者：黎书会吴艳孙志东陈继恩嬴登宇黄跃跃晋一棠李志超凉山彝族自治州林业草原科学研究院四川西昌615000

凉山州属四川省三大重点林区之一,也是林火发生的三大重灾区之一。本研究选取当地15种主要经济树种为对象,测定各树种不同器官(叶、枝)的理化性质与燃烧性能,分析不同树种的生物生态学特性、造林学特性及价值特性,研究不同树种的防火性... 详细信息

凉山州属四川省三大重点林区之一,也是林火发生的三大重灾区之一。本研究选取当地15种主要经济树种为对象,测定各树种不同器官(叶、枝)的理化性质与燃烧性能,分析不同树种的生物生态学特性、造林学特性及价值特性,研究不同树种的防火性能,旨在筛选适宜凉山州经济林发展的防火树种,有效提升该区域生物防火能力。结果表明:15个树种之间的7种理化性质和燃烧性能指标均呈显著差异,除粗灰分和木质素外,树叶的含水率、热值、燃点、粗脂肪、粗纤维指标权重均高于树枝,树叶的粗纤维指标(9.6%)和树枝的粗灰分指标(9.9%)分别为2种器官中最高权重指标。基于不同树种的防火性能,可将15种树种分为3类:Ⅰ类为优良防火树种,有胡桃、桑;Ⅱ类为较好防火树种,有乌桕、杧果、余甘子、枇杷、女贞、栗、石榴;Ⅲ类为较差防火树种,有华山松、野八角、杨梅、无患子、木樨榄、油茶。胡桃和桑的防火性能较强,可作为凉山州地区防火经济林的优选树种,建议防火隔离林带营建采用Ⅰ~Ⅱ类防火树种,而Ⅲ类树种大面积栽植后应注意防火。

关键词：燃烧性能经济树种胡桃桑

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Colonization of Penicillium oxalicum SL2 in Pb-contaminated paddy soil and its immobilization effect on soil Pb

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Journal of Environmental Sciences 2022年第10期34卷 53-62页

作者： Yu Gao Xiaohan Jiang Hanxin wu Jianhao Tong Xinyue Ren Jiayu Ren Qianhua wu jien Ye Chunhui Li Jiyan Shi Department of Environmental Engineering College of Environmental and Resource ScienceZhejiang UniversityHangzhou 310058China MOE Key Laboratory of Environmental Remediation and Ecological Health College of Environmental and Resource ScienceZhejiang UniversityHangzhou 310058China

Penicillium oxalicum SL2(SL2) is a previously screened Pb-tolerant fungus that can promote crops growth. The relationship between SL2 colonization and Pb immobilization was studied to provide a theoretical basis for microbial remediation of Pb-contaminated paddy *** this study, green fluorescent protein(GFP) labeled SL2 was inoculated into different Pbcontaminated paddy soils(S1-S6). The Pb extracted from the soil by HNO, EDTA and CaClwere used to characterize the available Pb. The results showed that the colonization of SL2was divided into lag phase(0-7 days), growth phase(7-30 days), and mortality phase(30-90days). SL2 colonized well in sandy soils rich in clay and total phosphorus with initial p H of 4.5-7.0. In addition, SL2 increased soil p H and decreased soil Eh, which was beneficial to immobilize Pb. In different soils, the highest percentages of CaCl-Pb, EDTA-Pb, and HNO3-Pb immobilized by SL2 were 34.34%-40.53%, 17.05%-20.11%, and 7.39%-15.62%, *** correlation analysis showed that the percentages of CaCl-Pb and EDTA-Pb immobilized by SL2 were significantly positively correlated with the number of SL2 during the growth phase. SL2 mainly immobilized Pb in the growth phase and a higher peak number of SL2 was beneficial to the immobilization of Pb.

关键词： Penicillium oxalicum SL2 Colonization Lead Availability Green fluorescent protein

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Resistive Switching Properties and Failure Behaviors of(Pt, Cu)/Amorphous ZrO_(2)/Pt Sandwich Structures

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Journal of Materials Science & Technology 2016年第7期32卷 676-680页

作者： Haifa Zhai Jizhou Kong jien Yang Jing Xu Qingran Xu Hongchen Sun Aidong Li Di wu Henan Province Key Laboratory of Photovoltaic Materials College of Physics and Electronic Engineering Henan Normal University National Laboratory of Solid State Microstructures Department of Materials Science and Engineering College of Engineering and Applied SciencesNanjing University State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

The effect of Pt and Cu electrodes on the resistive switching properties and failure behaviors of amor- phous ZrO2 films were investigated. Compared with Cu/ZrO2/Pt structures, the Pt/ZrO2/Pt structures exhibit better resistive switching properties such as the higher resistance ratio of OFF/ON states, the longer switch- ing cycles and narrow distribution of OFF state resistance （Roff）. The switching mechanism in the Pt/ZrO2/ Pt structure can be attributed to the formation and rupture of oxygen vacancy filaments; while in the Cu/ZrO2/Pt structure, there exist both oxygen vacancy filaments and Cu filaments. The formation of Cu filaments is related to the redox reaction of Cu electrode under the applied voltage. The inhomoge- neous dispersive injection of Cu ions results in the dispersive Ro~ and significant decrease of operate voltage, Schematic diagrams of the formation of conductive filaments and the failure mechanism in the Cu/ZrO2/ Pt structures are also proposed.

关键词： ZrO2 Thin films Sol-gel method Failure

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Stress-controlled fatigue of HfNbTaTiZr high-entropy alloy and associated deformation and fracture mechanisms

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Journal of Materials Science & Technology 2022年第19期114卷 191-205页

作者： Shuying Chen Weidong Li Ling Wang Tao Yuan Yang Tong Ko-Kai Tseng jien-Wei Yeh Qingang Xiong Zhenggang wu Fan Zhang Tingkun Liu Kun Li Peter KLiaw Institute for Advanced Studies in Precision Materials Yantai UniversityYantai 264005China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA Department of Industrial and Systems Engineering Ohio UniversityAthensOH 45701USA Department of Materials Science and Engineering High Entropy Materials CenterNational Tsing Hua UniversityHsinchu30013TaiwanChina State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China School of Light Industry and Engineering South China University of TechnologyGuangzhou 510640China College of Materials Science and Engineering Hunan UniversityChangsha 410082China WPI Advanced Institute for Materials Research Tohoku UniversitySendai 980-8577Japan State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China

The stress-controlled fatigue tests are carried out at a stress ratio of 0.1 and a frequency of 10 Hz,and span both low-cycle and high-cycle regimes by varying the applied stress *** high-cycle fa-tigue regime gives a fatigue strength of 497 MPa and a fatigue ratio of *** equivalent conditions,the alloy’s fatigue strength is greater than all other high-entropy alloys(HEAs)with reported high-cycle fatigue data,dilute body-centered cubic alloys,and many structural alloys such as steels,titanium al-loys,and aluminum *** in-depth analyses of crack-propagation trajectories,fracture-surface morphologies and deformation plasticity by means of various microstructural analysis techniques and theoretical frameworks,the alloy’s remarkable fatigue resistance is attributed to delayed crack initiation in the high-cycle regime,which is achieved by retarding the formation of localized persistent slip bands,and its good resistance to crack propagation in the low-cycle regime,which is accomplished by intrin-sic toughening backed up by extrinsic ***,the stochastic nature of the fatigue data is neatly captured with a 2-parameter Weibull model.

关键词： Fatigue mechanisms Intrinsic toughening Extrinsic toughening Probabilistic modeling

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Nuclear TIGAR mediates an epigenetic and metabolic autoregulatory loop via NRF2 in cancer therapeutic resistance

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Acta Pharmaceutica Sinica B 2022年第4期12卷 1871-1884页

作者： Hong Wang Qianqian Wang Guodi Cai Zhijian Duan Zoann Nugent Jie Huang Jianwei Zheng Alexander D.Borowsky Jian Jian Li Peiqing Liu Hsing-jien Kung Leigh Murphy Hong-wu Chen Junjian Wang School of Pharmaceutical Sciences Sun Yat-sen UniversityGuangzhou 510006China Department of Biochemistry and Molecular Medicine University of CaliforniaDavisSacramentoCA 95817USA Research Institute in Oncology and Hematology University of Manitoba and CancerCare ManitobaWinnipeg R3E 0V9Canada Guangdong Lung Cancer Institute Guangdong Provincial Key Laboratory of Translational Medicine in Lung CancerGuangdong Provincial People’s Hospital and Guangdong Academy of Medical SciencesGuangzhou 510080China Department of Pathology and Laboratory Medicine University of CaliforniaDavisSacramentoCA 95817USA Department of Radiation Oncology University of CaliforniaDavisSacramentoCA 95817USA National-Local Joint Engineering Laboratory of Druggability and New Drugs Evaluation Guangdong Provincial Key Laboratory of New Drug Design and EvaluationSun Yat-sen UniversityGuangzhou 510006China UC Davis Comprehensive Cancer Center School of MedicineUniversity of CaliforniaDavisSacramentoCA 95817USA

Metabolic and epigenetic reprogramming play important roles in cancer therapeutic ***,their interplays are poorly *** report here that elevated TIGAR(TP53-induced glycolysis and apoptosis regulator),an antioxidant and glucose metabolic regulator and a target of oncogenic histone methyltransferase NSD2(nuclear receptor binding SET domain protein 2),is mainly localized in the nucleus of therapeutic resistant tumor cells where it stimulates NSD2 expression and elevates global H3K36me2 ***,TIGAR directly interacts with the antioxidant master regulator NRF2 and facilitates chromatin recruitment of NRF2,H3K4me3 methylase MLL1 and elongating Pol-II to stimulate the expression of both new(NSD2)and established(NQO1/2,PRDX1 and GSTM4)targets of NRF2,independent of its enzymatic *** TIGAR confers cancer cell resistance to chemotherapy and hormonal therapy in vitro and in tumors through effective maintenance of redox *** addition,nuclear accumulation of TIGAR is positively associated with NSD2 expression in clinical tumors and strongly correlated with poor *** findings define a nuclear TIGAR-mediated epigenetic autoregulatory loop in redox rebalance for tumor therapeutic resistance.

关键词： TIGAR NSD2 NRF2 Metabolism Oxidative stress Epigenetic reprogramming Therapeutic resistance Redox homeostasis

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Message from Editors

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CES Transactions on Electrical Machines and Systems 2022年第4期6卷 341-342页

作者： Lijian wu Kai Wang Dawei Li Cungang Hu Junquan Chen Xiao Liu Shi Jin Wei Wang Feng Niu Hui Yang Xiaoqin Zheng jien Ma Zhejiang University-Shanghai Electric Wind Power Research Center Zhejiang University-Jiaxipera Electric Motor and Control Research Center Nanjing University of Aeronautics and Astronautics China Huazhong University of Science and Technology China Anhui University China Naval University of Engineering China Hunan University China Shenyang University of Technology China Southeast University China Hebei University of Technology China Qingdao University China Zhejiang University China

CONTROLLING carbon emissions to achieve green and sustainable development has become a global consensus and general *** established“30.60”decarbonization goal for carbon peak and carbon neutrality in *** electromechanical energy conversion devices,the electrical machines and systems play important roles in both renewable energy harvesting,such as wind,tidal,ocean current energy。

关键词： tidal ocean trend

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单克隆抗体亲和层析法纯化重组溶葡萄球菌酶

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生物工程学报 2009年第1期25卷 147-151页

作者：黄晋江吴宏宇张继恩黄青山上海高科联合生物技术研发有限公司上海201206 复旦大学生命科学学院遗传学研究所遗传工程国家重点实验室上海200433

溶葡萄球菌酶能够特异性杀灭金黄色葡萄球菌且不易产生耐药性,有望成为治疗葡萄球菌属细菌引发感染的特效药物。为获得高纯度的重组溶葡萄球菌酶以达到药用标准,本研究构建了一种以重组溶葡萄球菌酶单克隆抗体为配体的亲和层析纯化方法... 详细信息

溶葡萄球菌酶能够特异性杀灭金黄色葡萄球菌且不易产生耐药性,有望成为治疗葡萄球菌属细菌引发感染的特效药物。为获得高纯度的重组溶葡萄球菌酶以达到药用标准,本研究构建了一种以重组溶葡萄球菌酶单克隆抗体为配体的亲和层析纯化方法。纯化后的重组溶葡萄球菌酶纯度大于95%,得率大于90%,即使重复使用30多次,纯化效率不变。且经比色法鉴定纯化后的重组溶葡萄球菌酶仍具有良好的活性。该方法步骤简单,纯化效果好,为生产高纯度重组溶葡萄球菌酶奠定了基础。

关键词：溶葡萄球菌酶单克隆抗体亲和层析

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