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Tailoring d-band center over electron traversing effect of Ni M@C-CoP(M=Zn,Mo,Ni,Co)for high-performance electrocatalysis hydrogen evolution

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Journal of Materials Science & Technology 2023年第35期166卷 164-172页

作者： Hao Luo xudong Zhang Hui Zhu Kexin Zhang Fan Yang kewei xu Sen Yu Dagang Guo State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an710049China Center for High Performance Computing Network Information CenterXi’an Jiaotong UniversityXi’an710049China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an710049China Shaanxi Key Laboratory of Biomedical Metal Materials Northwest Institute for Non-ferrous Metal ResearchXi’an710016China

Attaining a highly efficient and inexpensive electrocatalyst is significant for the hydrogen evolution reaction(HER)but still challenging *** transition-metal phosphides(TMPs)catalysts with platinum-like electronic structures are a potential candidate for the HER,but those are prone to be strongly bound with hydrogen intermediates(H∗),resulting in sluggish HER *** we report a unique hybrid structure of CoP anchored on graphene nanoscrolls@carbon nano tubes(CNTs)scaffold(Ni M@C-CoP)encapsulating various Ni M(M=Zn,Mo,Ni,Co)bimetal nanoalloy via chemical vapor deposi-tion(CVD)growth of CNT on graphene nanoscrolls followed by the impregnation of cobalt precursors and phosphorization for efficiently electrocatalytic hydrogen *** nanoparticles mainly scattered at the tip of CNT branches which exhibited the analogical“Three-layer core-shell”*** and density functional theory(DFT)calculations consistently disclose that the encapsulated various NiMs can offer different numbers of electrons to weaken the interactions of outmost CoP with H∗and push the downshift of the d-band center to different degrees as well as stabilize the outmost CoP nanopar-ticles to gain catalytic stability via the electron traversing *** electrocatalytic HER activity can be maximumly enhanced with low overpotentials of 78 mV(alkaline)and 89 mV(acidic)at a current density of 10 mA/cm^(2) and sustained at least 24 h especially for NiZn@C-CoP *** novel system is distinct from conventional three-layer heterostructure,providing a specially thought of d-band center control engineering strategy for the design of heterogeneous catalysts and expanding to other electrocat-alysts,energy storage,sensing,and other applications.

关键词： Electron traversing effect 3D graphene/CNT CoP nanoparticle d-band center Hydrogen evolution

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智能控压控温软镜系统联合超脉冲光纤铥激光在上尿路结石治疗中的应用

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中华泌尿外科杂志 2024年第7期45卷 527-531页

作者：吴至楷刘成杨江华李卓航赖聪于浩许可慰中山大学孙逸仙纪念医院泌尿外科广州510120

目的评价智能控压控温软镜系统联合超脉冲光纤激光用于上尿路结石治疗的有效性和安全性。方法回顾性分析2024年2一4月于中山大学孙逸仙纪念医院行智能控压控温软镜系统联合超脉冲光纤激光碎石术的13例上尿路结石患者的临床资料。男7例,... 详细信息

目的评价智能控压控温软镜系统联合超脉冲光纤激光用于上尿路结石治疗的有效性和安全性。方法回顾性分析2024年2一4月于中山大学孙逸仙纪念医院行智能控压控温软镜系统联合超脉冲光纤激光碎石术的13例上尿路结石患者的临床资料。男7例,女6例;年龄(46±10)岁;结石累积直径(25.8±13.3)mm;肾下盏结石7例(53.8%),合并输尿管结石3例(23.1%)。术前尿培养阳性者4例(30.8%),尿常规白细胞>100个/μl者6例(46.2%)。对术前合并感染的患者根据药敏试验结果选用敏感抗菌药物治疗。智能控压控温软镜系统联合超脉冲光纤激光碎石术中参数设置:激光功率设置为45W(1.5J×30Hz,0.3J×150Hz),肾盂内压力阈值设置为30 mmHg(1mmHg=0.133kPa),温度阈值为43℃。术后留置双J管2~4周。结果13例均顺利完成手术,手术中位时间30(25,90)min。13例术中平均肾盂内压力范围为8~24mmHg,平均肾孟内温度25~34℃。1例患者术后出现发热(38℃),2例因术后疼痛需镇痛治疗,无其他术中、术后并发症。术后住院时间为(1.5±0.8)d。术后1个月评估结石清除率为84.6%(11/13)。结论智能控压控温软镜系统联合超脉冲光纤激光可有效控制肾盂内压及温度,结石清除率高,并发症发生率较低,是治疗上尿路结石安全、有效的方法。

关键词：尿路结石输尿管软镜肾盂内压力肾盂内温度光纤铥激光

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HCRVD: A Vulnerability Detection System Based on CST-PDG Hierarchical Code Representation Learning

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Computers, Materials & Continua 2024年第6期79卷 4573-4601页

作者： Zhihui Song Jinchen xu kewei Li Zheng Shan School of Cyberspace Security Information Engineering UniversityZhengzhou450001China

Prior studies have demonstrated that deep learning-based approaches can enhance the performance of source code vulnerability detection by training neural networks to learn vulnerability patterns in code ***,due to limitations in code representation and neural network design,the validity and practicality of the model still need to be ***,due to differences in programming languages,most methods lack cross-language detection *** address these issues,in this paper,we analyze the shortcomings of previous code representations and neural *** propose a novel hierarchical code representation that combines Concrete Syntax Trees(CST)with Program Dependence Graphs(PDG).Furthermore,we introduce a Tree-Graph-Gated-Attention(TGGA)network based on gated recurrent units and attention mechanisms to build a Hierarchical Code Representation learning-based Vulnerability Detection(HCRVD)*** system enables cross-language vulnerability detection at the *** experiments show that HCRVD surpasses many competitors in vulnerability detection *** benefits from the hierarchical code representation learning method,and outperforms baseline in cross-language vulnerability detection by 9.772%and 11.819%in the C/C++and Java datasets,***,HCRVD has certain ability to detect vulnerabilities in unknown programming languages and is useful in real open-source *** shows good validity,generality and practicality.

关键词： Vulnerability detection deep learning CST-PDG code representation tree-graph-gated-attention network cross-language

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Design and construction of ultra-thin MoSe2 nanosheet-based heterojunction for high-speed and low-noise photodetection

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Nano Research 2016年第9期9卷 2641-2651页

作者： Xiangshun Geng Yongqiang Yu Xiaoli Zhou Chunde Wang kewei xu Yan Zhang Chunyan Wu Li Wang Yang Jiang Qing Yang School of Electrical Science and Applied Physics Hefei University of TechnologyHefei 230009China Hefei National Laboratory for Physical Sciences at Microscale Department of ChemistryLaboratory of Nanomaterials for Energy Conversion and Synergetic Innovation Center of Quantum Information & Quantum PhysicsUniversity of Science and Technology of China(USTC)Hefei 230026China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China

Advances in the photocurrent conversion of two-dimensional (2D) transition metal dichalcogenides have enabled the realization and application of ultrasensitive and broad-spectral photodetectors. The requirements of previous devices constantly drive for complex technological implementation, resulting in limits in scale and complexity. Furthermore, the development of large-area and low-cost photodetectors would be beneficial for applications. Therefore, we demonstrate a novel design of a heterojunction photodetector based on solution-processed ultrathin MoSe2 nanosheets to satisfy the requirements of its application. The photodetector exhibits a high sensitivity to visible–near infrared light, with a linear dynamic range over 124 decibels (dB), a detectivity of ~1.2 × 1012Jones, and noise current approaching 0.1 pA·Hz–1/2at zero bias. Significantly, the device shows an ultra-high response speed up to 30 ns with a 3-dB predicted bandwidth over 32 MHz, which is far better than that of most of the 2D nanostructured and solution-processable photodetectors reported thus far and is comparable to that of commercial Si photodetectors. Combining our results with material-preparation methods, together with the methodology of device fabrication presented herein, can provide a pathway for the large-area integration of low-cost, high-speed photodetectors. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： molybdenum diselenide layer transition metal dichalcogenide (TMD) urtrathin nanosheet heterojunction ultrafast photoresponse

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Characterization of the arrangement feature of copper interconnects by Moir inversion method

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Theoretical & Applied Mechanics Letters 2012年第2期2卷 37-40页

作者： Qinghua Wang Satoshi Kishimoto Huimin Xie kewei xu Jianfeng Wang National Institute for Materials Science TsukubaIbaraki 305-0047Japan AML Department of Engineering MechanicsTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Xi'an Jiaotong UniversityXi'an 710049China

This paper explores the planar arrangement feature of the copper interconnects in a view field of several millimeters by the focused ion-beam （FIB） Moire inversion method quantitatively. The curved FIB Moire patterns indicate that the copper interconnects are a series of curves with continuous variations instead of beelines. The control equation set of the copper interconnects central lines is attained through the Moire inversion method. This work can be extended to inspect the structural defects and provide a reliable support for the interconnects structure fabrication.

关键词： copper interconnects arrangement Moire inversion method focused ion-beam

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Effect of coordination structure of aluminum on its activation from minerals and Oxisols during their acidification

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Pedosphere 2024年第5期34卷 916-928页

作者： kewei LI Yangxiaoxiao SHI Jackson Nkoh NKOH Jun JIANG Renkou xu State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences University of Chinese Academy of Sciences

The types and contents of phyllosilicate minerals in soils play an important role in soil acidification,as soil acid buffering capacity varies with the composition of the phyllosilicate *** addition to aluminum-oxygen （Al-O） octahedrons,a certain number of Al-O tetrahedrons exist in phyllosilicate minerals due to the isomorphic substitution of silicon ion (Si4+) by aluminum ion (Al3+) in Si-O tetrahedrons of ***,the effect of the two coordination structures of Al on the release of Al during mineral acidification has not yet been ***,the differences in Al activation in phyllosilicate minerals and soils with different Al coordination structures were investigated through constant-p H experiments and27Al magic-angle spinning nuclear magnetic resonance （MAS-NMR） *** results of27Al MAS-NMR spectra showed that kaolinite contained Al-O octahedrons,phlogopite and illite contained Al-O tetrahedrons,and vermiculite composite contained both octahedral and tetrahedral *** p Hvermiculite composite>phlogopite>kaolinite,which was consistent with the orders of cation exchange capacity and content of tetrahedral Al of the *** to the rate constants,the Al release rates were in the order of phlogopite>illite>vermiculite composite>kaolinite at p H *** for phlogopite,the Al release rates in these minerals increased with decreasing suspension p ***,the Al release contents and rates were greater in phlogopite,illite,and vermiculite composite containing Al-O tetrahedrons than in kaolinite containing only Al-O *** Oxisols derived from basalt with different ages were selected for similar ***27Al MAS-NMR spectra of the Oxisols showed that the 0.01-million-year （Ma） Oxisol contained both octahedral and tetrahedral Al,while the 1.33-Ma Oxisol contained only Al-O *** contents of b

关键词： Al-O octahedrons Al-O tetrahedrons aluminum release exchangeable Al phyllosilicate minerals soil acidification

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Structural and electronic properties of atomic oxygen adsorption on Cu(111) surface:A first-principles investigation

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Science China Chemistry 2013年第3期56卷 573-580页

作者： MA LiangCai ZHANG JianMin xu kewei College of Physics and Information Technology Shaanxi Normal University School of Physics and Electrical Information Engineering Ningxia University State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University

By using the first-principles calculations,we have systematically investigated the adsorption of atomic oxygen on Cu(111) surface for a wide range of coverages Θ(from 0.11 to 1.00 ML) and adsorption *** found that the fcc-hollow site is the most stable site for oxygen *** adsorption energy decreases with increasing oxygen coverage due to the increasing repulsive interaction in the overlayer O *** for coverage of 1.00 ML,the oxygen-induced lateral relaxations and bucklings are found in the outermost three Cu layers,and the hillock-like as well as ridge-like bucklings are also found for Θ=0.25 ML and Θ=0.75 ML as well as Θ=0.50 ML,*** an increasing oxygen coverage,the work function increases and the surface dipole moment *** transfer from the first layer Cu atoms to O adatoms indicates the O-Cu bond having some degree of ionic character,while the hybridization between O 2p and Cu 3d orbitals implies that it also has some degree of covalence ***,with the increasing oxygen coverage,more Cu 3d and O 2p states are empty thus weakening the binding of O/Cu(111) system,but increase in the PDOS at the Fermi *** implies an enhancement in the metallic character of the O/Cu(111) system.

关键词： adsorption oxygen relaxation electronic structures first-principles calculation

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投资者情绪与期货市场功能——基于沪深300股指期货的研究

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系统工程理论与实践 2020年第9期40卷 2252-2268页

作者：熊熊许克维沈德华天津大学管理与经济学部天津300072 中国社会计算研究中心天津300072

本文以2015年股指期货市场实行交易限制措施事件作为自然实验样本,研究了不同市场环境下投资者情绪对沪深300股指期货风险管理功能和价格发现功能的影响及其差异.研究结果表明,在无交易限制的市场环境下,投资者情绪对沪深300股指期货的... 详细信息

本文以2015年股指期货市场实行交易限制措施事件作为自然实验样本,研究了不同市场环境下投资者情绪对沪深300股指期货风险管理功能和价格发现功能的影响及其差异.研究结果表明,在无交易限制的市场环境下,投资者情绪对沪深300股指期货的风险管理能力和短期动态价格发现能力有显著的负面影响;而在有交易限制的市场环境下,投资者情绪对沪深300股指期货市场风险管理能力的影响出现反转,但其对股指期货市场价格发现能力的负面影响却进一步加剧,本文分析这一现象是由于交易限制规则实施后股指期货市场流动性和市场深度极度匮乏、逆向选择效应增强所致.与现有研究相比,本研究可以更有效地从市场微观结构角度揭示投资者情绪对金融市场的影响存在差异的原因.此外,本研究结果在以双重差分模型和以互联网搜索指数作为投资者情绪代理变量的检验中同样稳健.

关键词：股指期货投资者情绪风险管理价格发现

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A novel dual serotonin transporter and M-channel inhibitor D01 for antidepression and cognitive improvement

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Acta Pharmaceutica Sinica B 2024年第3期14卷 1457-1466页

作者： Yaqin Wei Xiangqing xu Qiang Guo Song Zhao Yinli Qiu Dongli Wang Wenwen Yu Yani Liu kewei Wang School of Pharmacy Xuzhou Medical UniversityXuzhou 221004China Institute of Pharmaceutical Research Jiangsu Nhwa Pharmaceutical Co.Ltd.&Jiangsu Key Laboratory of Central Nervous System Drug Research and DevelopmentXuzhou 221116China Department of Pharmacology School of PharmacyQingdao University Medical CollegeQingdao 266073China Institute of Innovative Drug Qingdao UniversityQingdao 266021China Center for Brain Science and Brain-Inspired Intelligence Guangdong-Hong Kong-Macao Greater Bay AreaGuangzhou 510515China

Cognitive dysfunction is a core symptom common in psychiatric disorders including depression that is primarily managed by antidepressants lacking efficacy in improving *** this study,we report a novel dual serotonin transporter and voltage-gated potassium Kv7/KCNQ/M-channel inhibitor D01(a 2-methyl-3-aryloxy-3-heteroarylpropylamines derivative)that exhibits both anti-depression effects and improvements in cognition.D01 inhibits serotonin transporters(K_(i)=30.1±6.9 nmol/L)and M channels(IC_(50)=10.1±2.4μmol/L).D01 also reduces the immobility duration in the mouse FST and TST assays in a dose-dependent manner without a stimulatory effect on *** administrations of D01(20 and 40 mg/kg)can significantly shorten the immobility time in a mouse model of chronic restraint stress(CRS)-induced depression-like ***,D01 dose-dependently improves the cognitive deficit induced by CRS in Morris water maze test and increases the exploration time with novel objects in normal or scopolamine-induced cognitive deficits in mice,but not ***,D01 reverses the long-term potentiation(LTP)inhibition induced by *** together,our findings demonstrate that D01,a dual-target serotonin reuptake and M channel inhibitor,is highly effective in the treatment-resistant depression and cognitive deficits,thus holding potential for development as therapy of depression with cognitive deficits.

关键词： SERT 5-HT Kv7/KCNQ/M current D01 Depression Cognition

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Demonstration of acousto-optical modulation based on a thin-film AlScN photonic platform

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Photonics Research 2024年第6期12卷 1138-1149页

作者： kewei BIAN ZHENYU LI YUSHUAI LIU SUMEI xu XINGYAN ZHAO YANG QIU YUAN DONG QIZE ZHONG TAO WU SHAONAN ZHENG TING HU School of Microelectronics Shanghai UniversityShanghai 201800China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China

Acousto-optic(AO)modulation technology holds significant promise for applications in microwave and optical signal ***-film scandium-doped aluminum nitride(AlScN),with excellent piezoelectric properties and a wide transparency window,is a promising candidate for achieving on-chip AO modulation with a fabri-cation process compatible with complementary metal-oxide-semiconductor(CMOS)*** study presents,to the best of our knowledge,the first demonstration of AO modulators with surface acoustic wave generation and photonic waveguides monolithically integrated on a 400-nm-thick film of AlScN on an *** intramodal AO modulation is realized based on an AlScN straight waveguide,and the modulation efficiency is significantly enhanced by 12.3 dB through the extension of the AO interaction length and the utilization of bidirectional acoustic *** intermodal AO modulation and non-reciprocity are further demonstrated based on a multi-mode spiral waveguide,achieving a high non-reciprocal contrast(>10 dB)across an optical bandwidth of 0.48 *** research marks a significant stride forward,representing an advancement in the realization of microwave photonic filters,magnet-free isolators,and circulators based on the thin-film AlScN photonic platform.

关键词： waveguide film microwave

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