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Hexagonal warping effect on Majorana zero modes at the ends of superconducting vortex lines in doped strong 3D topological insulators

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Science China(Physics,Mechanics & Astronomy) 2019年第11期62卷 125-134页

作者： Chuang Li lun-hui hu Fu-Chun Zhang Department of Physics Zhejiang UniversityHangzhou 310027China Kavli Institute for Theoretical Sciences University of Chinese Academy of SciencesBeijing 100190China Department of Physics University of CaliforniaSan Diego CA 92093USA CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

In a superconducting topological insulator, a superconducting vortex line can trap a one-dimensional topological band with localized Majorana zero modes at the ends. Here, we study the effect of hexagonal warping and its corresponding symmetry-breaking effect on vortex phase transition. We perform both analytical calculations based on a semiclassical formula and numerical calculations based on full quantum mechanics using the Bogoliubov-de Gennes equation. We find that the hexagonal warping term extends the topological region of the vortex line as the chemical potential changes and leads to MZMs, even in the absence of topological surface states.

关键词： topological insulator topological superconductor vortex phase transition Majorana zero modes hexagonal warping

SYNTHESIS OF DIAZA CROWN ETHER CHIRAL LIQUID CRYSTAL

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Chinese Chemical Letters 1992年第10期3卷 775-778页

作者： Ming Gui XIE Jun QIN Zi lun hu hua Ming ZHAO Department of Chemistry Sichuan UniversityChengdu 610064.

A chiral liquid crystal crown ether containing diaza-18-crown-6 was synthesized with the help of CPK atomic model and in the meantime a nonchiral liquid crystal crown ether of alike structure was also synthesized for comparison, indicating that only the former was asymmetric. The present work represents the first attempt of the investigation in chiral liquid crystal crown ether, thus providing basis for further research into problems as such.

关键词： KBr IR CDC SH ppm SYNTHESIS OF DIAZA CROWN ETHER CHIRAL LIQUID CRYSTAL

Photoinduced transposed Paternò-Büchi reaction for effective synthesis of high-performance jet fuel

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Chinese Journal of Chemical Engineering 2024年第3期67卷 39-48页

作者： Jinxiu hu Xianlong Liu Yi Liu Kang Xue Chengxiang Shi Xiangwen Zhang Li Wang Ji-Jun Zou lun Pan Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Zhejiang Institute of Tianjin University Ningbo 315201China Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China

High-energy-density fuels are important for volume-limited aerospace vehicles,but the increase in fuel energy density always leads to poor cryogenic ***,we investigated the transposed Paternò-Büchi reaction of biomass cyclic ketone and cyclic alkene to synthesize a new kind of alkyl-substituted polycyclic hydrocarbon fuel with high energy density and good cryogenic *** triplet-energy-quenching results and phosphorescent emission spectra reveal the sensitization mechanism of the reaction,including photosensitizer excitation,triplettriplet energy transfer,cyclization,and relaxation,and the possible reaction path was revealed by the density functional theory(DFT)*** reaction conditions of photosensitizer type and addition,molar ratio of substrates,reaction temperature,and incident light intensity were optimized,with the target product yield achieving 65.5%.Moreover,the reaction dynamics of the reaction rate versus the light intensity are *** the hydrogenation-deoxygenation reaction,three fuels with a high density of 0.864-0.938 g·ml^(-1) and a low freezing point of<-55℃ are *** work provides a benign and effective approach to synthesize high-performance fuels.

关键词： High-energy-density fuel Transposed Patern-oeBüchi reaction Kinetics Bioenergy Photochemistry

开绕组BLDCM直接转矩控制电压矢量特性研究

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微特电机 2024年第4期52卷 8-15页

作者：华文韬杨建飞邱鑫陈秋仲刘业胡伦周锴刘畅陈洪生南京师范大学电气与自动化工程学院江苏省三维打印装备与制造重点实验室南京210023

基于直接转矩控制(DTC)的开绕组无刷直流电机(BLDCM)具有运行效率高、电压矢量多样、控制结构简单等优点,适用于工业领域。根据共直流母线开绕组BLDCM控制拓扑搭建了相应的数学模型,对该拓扑下电压矢量的特性进行理论分析及分类,并将电... 详细信息

基于直接转矩控制(DTC)的开绕组无刷直流电机(BLDCM)具有运行效率高、电压矢量多样、控制结构简单等优点,适用于工业领域。根据共直流母线开绕组BLDCM控制拓扑搭建了相应的数学模型,对该拓扑下电压矢量的特性进行理论分析及分类,并将电压幅值不为零的电压矢量分为大、中、小三类。分析结果表明:在相同的运行条件下,大矢量作用下转矩变化率最大,小矢量作用下转矩变化率最小,中矢量居于两者之间。仿真结果验证了理论分析的正确性和控制方法的可行性。

关键词：无刷直流电机开绕组直接转矩控制两相导通电压矢量

Enhancement of T Follicular Helper Cell-Mediated humoral Immunity Reponses During Development of Experimental Autoimmune Myasthenia Gravis

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Neuroscience Bulletin 2019年第3期35卷 507-518页

作者： Ying-Zhe Cui Si-Ying Qu Lu-Lu Chang Jia-Rui Zhao Lili Mu Bo Sun hu-lun Li Tong-Shuai Zhang Guang-You Wang Qing-Fei Kong Department of Neurobiology Heilongjiang Provincial Key Laboratory of Neurobiology Harbin Medical University

Myasthenia gravis(MG) is a prototypical antibody-mediated neurological autoimmune disease with the involvement of humoral immune responses in its pathogenesis. T follicular helper(Tfh) cells have been implicated in many autoimmune diseases. However, whether and how Tfh cells are involved in MG remain ***, we established and studied a widely-used and approved animal model of human MG, the rat model with acetylcholine receptor alpha(AChRa) subunit(RAChR97–116)-induced experimental autoimmune myasthenia gravis(EAMG). This model presented mild bodyweight loss 10 days after the first immunization(representing the early stage of disease) and more obvious clinical manifestations and body-weight loss 7 days after the second immunization(representing the late stage of disease). AChR-specific pre-Tfh cells and mature Tfh cells were detected in these two stages, respectively. In cocultures of Tfh cells and B cells, the number of IgG2 bsecreting B cells and the level of anti-AChR antibodies in the supernatant were higher in the cultures containing EAMG-derived Tfh cells. In immunohistochemistry and immunofluorescence assays, a substantial number of CD4^+/Bcl-6^+ T cells and a greater number of larger germinal centers were observed in lymph node tissues resected from EAMG rats. Based on these results, wehypothesize that an AChR-specific Tfh cell-mediated humoral immune response contributes to the development of EAMG.

关键词： Follicular helper T cells Experimental autoimmune myasthenia gravis Acetylcholine receptor Germinal center

Limit cycle oscillation suppression of 2-DOF airfoil using nonlinear energy sink

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Applied Mathematics and Mechanics(English Edition) 2013年第10期34卷 1277-1290页

作者：郭虎伦陈予恕杨天智 School of Mechanical Engineering Tianjin University Tianjin Key Laboratory of Nonlinear Dynamics and Chaos Control School of Astronautics Harbin Institute of Technology Department of Engineering Mechanics Shenyang Aerospace University

This paper presents a novel mechanical attachment, i.e., nonlinear energy sink （NES）, for suppressing the limit cycle oscillation （LCO） of an airfoil. The dynamic responses of a two-degree-of-freedom （2-DOF） airfoil coupled with an NES are studied with the harmonic balance method. Different structure parameters of the NES, i.e., mass ratio between the NES and airfoil, NES offset, NES damping, and nonlinear stiffness in the NES, are chosen for studying the effect of the LCO suppression on an aeroelastic system with a supercritical Hopf bifurcation or subcritical Hopf bifurcation, respectively. The results show that the structural parameters of the NES have different influence on the supercritical Hopf bifurcation system and the subcritical Hopf bifurcation system.

关键词： two-degree-of-freedom (2-DOF) airfoil flutter limit cycle oscillation (LCO)suppression nonlinear energy sink (NES)

Studies on Rare Earth Metal-Hydroboron Componuds(Ⅰ) Syntheses and Properties of Benzoylhydrazine Chelates of Rare Earth Metal (Ⅲ) Dodecahydrododecaborates

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Chemical Journal of Chinese Universities 1985年第1期 1-6页

作者： Zhang lun,hu Peizhi,Qian Chunhua and Zhang Guomin (Department of Chemistry,Wuhan University,Wuhan)

In this paper,the bcnzoylhydrazine chelates of rare earth metal (Ⅱ) dodecahydro-dodccaboratcs have been synthesized and eaxmined by elemental analysis,IR spectra and *** *** have the following formulae [Ln(BH)4]2 (U12H12)3(Ln=La,Pr,Nd,Sm,Eu,Gd,Tb,Ho,Er,Tm,Yb;BH=Benzoylhy-drazint).DTA results point out that these chelalrs are thermally stable.

关键词： Dodecahydrododecaborates Syntheses and Properties of Benzoylhydrazine Chelates of Rare Earth Metal

干旱风险冲击下节水灌溉技术采用的减贫效应——以甘肃省张掖市为例

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资源科学 2018年第2期40卷 417-426页

作者：胡伦陆迁西北农林科技大学经济管理学院杨凌712100

推广节水灌溉技术已成为西部干旱半干旱地区政府干预贫困的主要手段,其减贫效果如何有待进一步检验。文章利用甘肃省张掖市540份农户微观数据,运用二元Logistic模型实证分析干旱风险冲击下农户节水灌溉技术采用对贫困发生率和贫困脆弱... 详细信息

推广节水灌溉技术已成为西部干旱半干旱地区政府干预贫困的主要手段,其减贫效果如何有待进一步检验。文章利用甘肃省张掖市540份农户微观数据,运用二元Logistic模型实证分析干旱风险冲击下农户节水灌溉技术采用对贫困发生率和贫困脆弱性的影响。结果发现:(1)干旱冲击是农户致贫的关键因素,农业干旱损失每提高1元,会使农户贫困发生率和未来发生贫困的可能性提高16.6%和4.0%;(2)节水灌溉技术显著降低农户贫困发生率和贫困脆弱性,减贫效应显著。灌溉技术采用意愿每提高1个档次,会使农户当前贫困发生和未来贫困发生的概率分别下降10.5%和2.6%;(3)节水灌溉技术采用具有降低农业干旱风险冲击对农户贫困发生率的负向影响的功能,但对减缓风险冲击的贫困脆弱性效应并不显著。

关键词：干旱风险冲击节水灌溉技术采用减贫效应工具变量农户甘肃省张掖市

Design,synthesis,and biological evaluation of 1,2,4-triazole derivatives as potent antitubercular agents

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Chinese Chemical Letters 2024年第3期35卷 326-331页

作者： Yu Wen Shichun lun Yuxue Jiao Wei Zhang Tianyu hu Ting Liu Fan Yang Jie Tang Bing Zhang William R.Bishai Li-Fang Yu Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Center for Tuberculosis Research Department of MedicineDivision of Infectious DiseaseJohns Hopkins School of MedicineBaltimoreMD21231-1044United States Shanghai Institute for Advanced Immunochemical Studies and School of Life Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Key Laboratory of Green Chemistry and Chemical Process School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China

Inhibition of mycobacterial membrane protein large 3(MmpL3)thereby affecting the mycolic acid biosynthetic pathway has been proven to be an effective strategy for developing antitubercular *** on the X-ray crystal structure of MmpL3 inhibitor complexes,a series of novel 1,2,4-triazole derivatives were designed,synthesized and evaluated antitubercular activity against Mtb strain *** structure–activity relationship exploration resulted in the identification of compounds 21 and 28,which possess potent antitubercular activity against Mtb strain H37Rv[minimum inhibitory concentration(MIC)=0.03–0.13μg/mL]and the clinical isolates of multidrug resistance(MDR)and extensive drug resistance(XDR)tuberculosis(MIC=0.06–1.0μg/mL).Moreover,compounds 21 and 28 showed neglectable cytotoxicity(IC_(50)≥32μg/mL)to the mammalian Vero cells and favorable physicochemical and pharmacokinetic properties according to the in silico absorption,distribution,metabolism and excretion(ADME)***,the potential target of representative 1,2,4-triazole 28 was identified to be MmpL3 using a microscale thermophoresis(MST)assay.

关键词： Tuberculosis MDR and XDR-TB MmpL3 inhibitor 1 2 4-Triazole Structure-based drug design