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Hyperbolic metamaterial using chiral molecules

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Science China(Physics,Mechanics & Astronomy) 2020年第6期63卷 13-21页

作者： JieXing Zhao JingJing Cheng YingQi Chu yanxiang wang FuGuo Deng Qing Ai Department of Physics Applied Optics Beijing Area Major LaboratoryBeijing Normal UniversityBeijing 100875China NAAM-Research Group Department of MathematicsFaculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

We theoretically investigate the intra-band transitions in Mobius *** to the weak magnetic response,the relative permittivity is significantly modified by the presence of the medium while the relative permeability is *** show that there is hyperbolic dispersion relation induced by the intra-band transitions because one of the eigen-values of permittivity possesses a different sign from the other two,while all three eigen-values of permeability are *** further demonstrate that the bandwidth of negative refraction is 0.165 eV for the H-polarized incident light,which is broader than the ones for inter-band transitions by 3 orders of ***,the frequency domain has been shifted from ultra-violet to visible *** there is negative refraction for the E-polarized incident light,the bandwidth is much narrower and depends on the incident angle.

关键词： negative refraction hyperbolic dispersion Mobius molecules visible light broad bandwidth

Current status of applying microwave-associated catalysis for the degradation of organics in aqueous phase – A review

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Journal of Environmental Sciences 2019年第7期31卷 119-135页

作者： Chao Xue Yanpeng Mao Wenlong wang Zhanlong Song Xiqiang Zhao Jing Sun yanxiang wang School of Energy and Power Engineering Shandong University School of Material Science & Engineering Shandong University

Interactions between microwaves and certain catalysts can lead to efficient, energy-directed convergence of a relatively dispersed microwave field onto the reactive sites of the catalyst,which produces thermal or discharge effects around the catalyst. These interactions form"high-energy sites"(HeS) that promote energy efficient utilization and enhanced in situ degradation of organic pollutants. This article focuses on the processes occurring between microwaves and absorbing catalysts, and presents a critical review of microwave-absorbing mechanisms. This article also discusses aqueous phase applications of relevant catalysts(ironbased, carbon-based, soft magnetic, rare earth, and other types) and microwaves, special effects caused by the dimensions and structures of catalytic materials, and the optimization and design of relevant reactors for microwave-assisted catalysis of wastewater. The results of this study demonstrate that microwave-assisted catalysis can effectively enhance the degradation rate of organic compounds in an aqueous phase and has potential applications to a variety of engineering fields such as microwave-assisted pyrolysis, pollutant removal,material synthesis, and water treatment.

关键词： Microwaves Catalysts High energy sites Organics degradation Aqueous phase

Synthesis and biological evaluation of new 13-n-nonylprotoberberine derivatives as antitubercular agents

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Acta Pharmaceutica Sinica B 2013年第1期3卷 38-45页

作者： Yinghong Li Yanxin Liu yanxiang wang Sheng Tang Danqing Song Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100050China

Tuberculosis is a serious threat to public health throughout the world.A series of new l3-n-nonylprotoberberine derivatives was designed,synthesized and evaluated for anti-mycobacterial activity against Mycobacterium tuberculosis strain H_(37)*** compounds(2,11a-c,11g,13d,15c)exhibited excellent anti-tubercular activity with an MIC below 1.0μg/***,compound 13d showed potential antibacterial effect against both drug-susceptible and multidrug-resistant(MDR)*** with MIC ranges of 0.0625-1.0μg/*** results suggest a mode of action different from that of the current anti-mycobacterial drugs rifampicin and ***,compound 13d is an attractive lead compound for the development of new antitubercular agents.

关键词： 13-n-nonylberberine Antitubercular Structure-activity rela-tionship MIC Drug-resistant

Synthesis of LiMn2O4 Nano-wires via Flux Method and Their Usage as Cathode Material for Lithium Ion Batteries

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Chemical Research in Chinese Universities 2015年第5期31卷 820-824页

作者： MENG Yujia LIU Xiaoyang LIU Li LI Benxian ZHAO Xudong FENG Likun wang yanxiang wang Xiaofeng State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin University Changchun 130012 P. R. China Department of Chemistry Northeast Normal University Changehun 130024 P. R. China

LiMn2O4 nano-wires with ideal size distribution were readily synthesized by flux method. Samples prepared conventionally were used as the comparison references to investigate the effect of flux. The structural, morphological and electrochemical properties of nano-sized materials were examined by powder X-ray diffraction（XRD） analysis, scanning electron microscopy（SEM） and charge-discharge cycling analysis. Results from galvanostatic charge-discharge analysis show that the samples prepared at 700 ℃ via flux method（FM-700） afford the highest initial discharge capacity of 125.5 mA·h/g between 3.0 to 4.3 V at a rate of 0.2 C. After 50 cycles, a cycling retention of 89.6% is evident. Overall, the LiMn2O4 nano-wires developed in this work seem to be promising cathode materials for lithium ion batteries suitable to different energy-saving settings.

关键词： Flux method LiMn2O4 nano-wire Lithium ion battery

Synthesis and biological evaluation of novel tricyclic matrinic derivatives as potential anti-filovirus agents

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Acta Pharmaceutica Sinica B 2018年第4期8卷 629-638页

作者： Xin Zhang Qiang Liu Qianqian Li Yinghong Li Zhandong Liu Hongbin Deng Sheng Tang yanxiang wang Youchun wang Danqing Song Beijing Key Laboratory of Antimicrobial Agents Institute of Medicinal BiotechnologyChinese Academy of Medical Science & Peking Union Medical College Division of HIV/AIDS and Sex-transmitted Virus Vaccines National Institutes for Food and Drug Control Department of Neurology Beijing Friendship HospitalCapital Medical University

Twenty-six novel tricyclic sophoridinic and matrinic derivatives containing a common chlorinated benzene fragment were designed, synthesized and evaluated for their anti-ebolavirus(EBOV)activities. Structure–activity relationship analysis indicated:(i) 12 N-dichlorobenzyl motif was beneficial for the activity;(ii) the chiral configuration at C5 atom might not affect the activity much. Among the target compounds, compound 7d exhibited the most potent potency against EBOV with an IC_(50) value of 5.29 μmol/L and an SI value of over 37.8. Further in vivo anti-EBOV assay of 7d identified its high effectiveness, and in vivo anti-MARV assay of 7d suggested its inspiring broad-spectrum anti-filovirus activity. The results provided powerful information on further strategic optimization and development of this kind of compounds against filoviruses.

关键词： Sophoridinic Matrinic Structure-activity relationship EBOV Filovirus

Riding to Northeast Guangdong

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China Book International 2024年第5期 98-99页

作者： wang yanxiang China Writers Association

I knew that one day,I would return *** see the endless green landscapes,to witness the rapid development like rushing rivers,and to feel the cool breeze over the water and the bright moon between the mountains.I wante... 详细信息

关键词： mountains Northeast return

The impact of nanoporous SiN_x interlayer growth position on high-quality GaN epitaxial films

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Chinese Science Bulletin 2011年第25期56卷 2739-2743页

作者： MA ZiGuang XING ZhiGang wang XiaoLi CHEN Yao XU PeiQiang CUI yanxiang wang Lu JIANG Yang JIA HaiQiang CHEN Hong Beijing National Laboratory of Condensed Matter Institute of Physics Chinese Academy of Sciences Beijing 100190 China

The impact of nanoporous SiN x interlayer growth position on high-quality GaN epitaxial film was elucidated from the behavior of dislocations. The best quality GaN film was achieved when a nanoporous SiN x interlayer was grown on a rough layer, with the high-resolution X-ray diffraction rocking curve full width at half maximum for ( 1102 ) reflection decreasing to 223 arcs, and the total dislocation density reduced to less than 1.0×10 8 cm 2 . GaN films were grown on sapphire substrates by metal organic chemical vapor deposition. The quality of these films was investigated with high-resolution X-ray diffraction, atomic force microscopy, and cross-sectional transmission electron microscopy. A preference for the formation of half-loops to reduce threading dislocations was observed when an SiN x interlayer was grown on a rough layer. A growth mechanism is proposed to explain this preference.

关键词：氮化硅外延片多孔层间氮化镓 GaN薄膜化学气相沉积法透射电子显微镜

Simultaneously enhancing the electronic and ionic conductivities of Li_(2)ZnTi_(3)O_(8)via modification with polyacrylonitrile-derived carbon for high-performance anodes

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ChemPhysMater 2023年第1期2卷 43-51页

作者： Yujun Bai Jiali Qin Jiaxuan Cai Huiling Zhu Tao Li yanxiang wang Yongxin Qi Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250061China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Polyacrylonitrile(PAN)with C≡N bonds can be converted to nitrogen-doped carbon during carbonization,which enhances electronic conductivity by compensating for the deficiency of the Li_(2)ZnTi_(3)O_(8)(LZTO)*** this study,LZTO was modified by carbonizing a homogeneous PAN/LZTO powder mixture at approximately 800℃for 5 h in nitrogen stream to uniformly coat nitrogen-doped carbon around the LZTO particles and to yield nitrogen-doped ***-60 exhibited a capacity retention of 74.8%as the current density increased from 0.1 to 1.6 A g−1,and had charge/discharge capacities of 250.1/250.8 mAh g−1 even after 1100 cycles at 0.5 A g−*** and compositional analysis along with electrochemical tests showed that the uniform nitrogen-doped carbon coating and the nitrogen-doped LZTO favor electron transfer,while the defects induced by nitrogen-doping in LZTO promote Li-ion *** enhanced electronic and ionic conductivities are favorable to alleviate the polarization during cycling,and thus are responsible for the optimized performance.

关键词： Conductivity Polyacrylonitrile Li_(2)ZnTi_(3)O_(8) Carbon coating N-doping

阴道分娩后尿失禁患者疾病应对方式及其相关影响因素分析

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广州医药 2025年第2期56卷 211-215页

作者：张德兰王燕香郭秋霞高闽清徐华丽厦门市第三医院妇产科福建厦门361100 厦门市第三医院综合内科福建厦门361100 厦门市第三医院麻醉科福建厦门361100

目的探讨阴道分娩后尿失禁患者疾病应对方式的影响因素。方法选取2022年1月—2023年1月医院收治的阴道分娩后尿失禁患者78例,评估所有患者的应对方式,根据结果分为积极应对组与消极应对组,设计基线资料调查表,详细统计两组患者的基线资... 详细信息

目的探讨阴道分娩后尿失禁患者疾病应对方式的影响因素。方法选取2022年1月—2023年1月医院收治的阴道分娩后尿失禁患者78例,评估所有患者的应对方式,根据结果分为积极应对组与消极应对组,设计基线资料调查表,详细统计两组患者的基线资料并比较,重点分析阴道分娩后尿失禁患者疾病应对方式的影响因素。结果经评估,78例阴道分娩后尿失禁患者疾病消极应对有40例,占比51.28%;积极应对组与消极应对组患者的产次(χ^(2)=4.110,P=0.043)、文化水平(Z=2.094,P=0.036)、家庭关怀度(Z=2.069,P=0.040)与自我效能(Z=2.249,P=0.025)比较差异有统计学意义,组间年龄(t=0.096,P=0.924)、孕次(t=1.257,P=0.212)、体质指数(BMI)(t=0.125,P=0.901)、工作(χ^(2)=0.778,P=0.378)、家庭月人均收入(χ^(2)=0.044,P=0.834)、漏尿(χ^(2)=0.040,P=0.842)比较差异无统计学意义;经回归分析发现,家庭关怀度低(OR=1.799,P=0.041)、自我效能低(OR=1.942,P=0.026)、经产妇(OR=2.554,P=0.045)及文化水平低(OR=1.837,P=0.038)均是阴道分娩后尿失禁患者疾病应对方式的影响因素。结论阴道分娩后尿失禁患者疾病消极应对风险高,可能与产次、文化水平、家庭关怀度及自我效能有关。

关键词：阴道分娩尿失禁应对方式影响因素