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Recent progress on photoactive nonprecious transition-metal complexes

Science China Chemistry 2025年第1期 46-95页

作者： Zhong-Liang Gong Hong-Jie Zhang Yan Cheng Jianxun Liu Yuhan Ai Yaqin Li Zhihui Feng Qiong Zhang Shaolong Gong Yong Chen Chang-Jiang Yao Yuan-Yuan Zhu Liang-Jin xu Yu-Wu Zhong CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences State Key Laboratory of Structural Cemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences School of Chemistry and Chemical Engineering Anhui Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of Technology State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical Engineering Beijing Institute of Technology College of Chemistry and Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Wuhan University School of Chemistry and Chemical Engineering Anhui University Key Laboratory of Photochemical Conversion and Optoelectronic Materials & CAS-HKU Joint Laboratory on New Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences

Photoactive complexes of nonprecious transition metals, mainly including those in the first-row and partially the second-row of the Periodic table of elements, have received increasing attention in view of their low cost and long-term sustainability. They are recognized as promising alternatives to noble transition metal complex congeners that have been extensively studied in optoelectronic devices, artificial photosynthesis, photocatalysis, biodiagnostics, and therapeutics, etc. This review is devoted to a comprehensive summary on the classical and recent advances on photoactive nonprecious transition metal complexes, including photoactive Zr, V, Cr, Mo, and W complexes, Mn complexes and hybrids, Fe, Co, Ni, and Cu complexes, and Zn and Cd complexes and hybrids. A particular focus is given on the molecular design, modulation of photophysical and photochemical properties, and applications of the representative and lately-developed nonprecious metal complexes. In addition, a perspective on the future development in this field is provided at the end of this review.

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Particle size effect on ammonium perchlorate decomposition kinetics

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航空动力学报 2012年第5期27卷 1179-1184页

作者： Abdel-Wareth W xu xu School of Astronautics Beijing University of Aeronautics and AstonauticeBeijing 100191China

The decomposition kinetic parameters of ammonium perchlorate(AP) having different grain size(10-390 μ m) were investigated through simultaneous DSC / TGA(differential scanning calorimetry / thermal gravimetric analysis) analyzer in a dynamic nitrogen atmosphere under heating rate of 40K / *** kinetic parameters such as activation energy and pre-exponential factor were determined by the modified isoconversional *** Brurzauer-Emmett-Teller(BET)-method was applied to measure AP specific surface *** results show that the higher the AP particle size the lower the determined kinetic parameters and are matched with some important literatures.

关键词： ammonium perchlorate particle size specific surface area thermal decomposition thermogravimetry

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Orbitronics for energy-efficient magnetization switching

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Science China(Information Sciences) 2025年第1期 398-399页

作者： Yuxuan YAO Daoqian ZHU Qingtao XIA Jianing LIANG Yuhao JIANG Zhiyang PENG Jiaxu LI Chen XIAO Renyou xu Wenwen WANG Xiantao SHANG Shiyang LU Dapeng ZHU Hong-Xi LIU Kaihua CAO Weisheng ZHAO Fert Beijing Institute School of Integrated Circuit Science and Engineering Beihang University National Key Lab of Spintronics Institute of International Innovation Beihang University Qingdao Research Institute Beihang University Truth Memory Corporation

Spin-orbit torque （SOT）,as a promising writing method for magnetic random-access memory （MRAM）,has garnered widespread interest for over a decade [1].Heavy metals,such as β-W,have been broadly adopted as spin current sources,but suffer from phase change at a limited thickness,resulting in a dramatic reduction of the charge-tospin conversion efficiency θSH[2].The thickness limitation leads to stringent etching conditions and large distribution among devices,posing challenges for simultaneously satisfying SOT efficiency,etching-stop margins,and back-end-ofline （BEOL） compatibility.

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Experimental investigation on a novel liquid cooling device for a prismatic Li-ion battery module operating at high ambient temperature

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Science China(Technological Sciences) 2020年第10期63卷 2147-2153页

作者： xu JiaWei ZHOU TianShu xu XinHai School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China

A novel liquid cooling device for a prismatic LiFePO4 battery module was proposed and manufactured in this study in order to improve the thermal management performance of the battery module operating at high ambient temperature.A testing system was set up to experimentally measure temperatures in different locations of the battery module consisting of seven 60 Ah *** were conducted to investigate both the passive and active cooling performances of the proposed system at different ambient temperatures and discharging rates in regarding with the maximum temperature and difference between the maximum and minimum *** results clearly show that both the ambient temperature and discharging rate play important role on the maximum temperature of the battery *** cooling cannot meet the cooling requirement of the battery module particularly at high ambient temperature of 40℃.In contrary,liquid cooling can successfully reduce the maximum temperature to the required temperature range of the battery module even in high temperature environment and relatively high discharging *** effect of water inlet temperature on the cooling performance was also experimentally *** the inlet temperature of 28℃,the active cooling device can reduce the maximum temperature of the battery module to about 34.8℃after discharging at 0.6℃for 1000 *** temperature difference of only 3.8℃was also achieved which suggests a great uniform distribution of temperature in the battery module.

关键词： liquid cooling maximum temperature temperature difference Li-ion battery cold plate thermal management

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糖尿病性白内障患者术后黄斑水肿的影响因素分析

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国际眼科杂志 2025年第1期25卷 140-143页

作者：李明徐方许之娟胶州中心医院眼科山东省青岛市266300

目的:探讨糖尿病性白内障患者手术治疗后发生黄斑水肿的危险因素,为术后防治提供参考依据。方法:选取青岛市胶州中心医院眼科2022-01/2024-01实施超声乳化手术治疗后且发生黄斑水肿的糖尿病性白内障患者55例55眼作为水肿组,另外年龄与... 详细信息

目的:探讨糖尿病性白内障患者手术治疗后发生黄斑水肿的危险因素,为术后防治提供参考依据。方法:选取青岛市胶州中心医院眼科2022-01/2024-01实施超声乳化手术治疗后且发生黄斑水肿的糖尿病性白内障患者55例55眼作为水肿组,另外年龄与性别基本匹配的接受相同手术治疗但未发生黄斑水肿的糖尿病性白内障患者59例59眼作为对照组,分析房水中干扰素诱导蛋白-10(IP-10)、巨噬细胞趋化蛋白-1(MCP-1)、血管内皮生长因子(VEGF)与患者术后黄斑水肿的关系。结果:水肿组的年龄、糖尿病病程、最佳矫正视力(BCVA)、糖化血红蛋白(HbA1c)、肌酐测定值、房水中IP-10、MCP-1、VEGF水平均大于对照组(均P<0.05);糖尿病病程延长、BCVA、HbA1c升高、肌酐升高及房水中IP-10升高、MCP-1升高、VEGF升高是糖尿病性白内障患者手术后发生黄斑水肿的危险因素(均P<0.05)。结论:糖尿病性白内障患者手术治疗后发生黄斑水肿与糖尿病病程延长、BCVA、HbA1c升高、肌酐升高及房水中IP-10升高、MCP-1升高、VEGF升高有关,临床应该针对性地提前给予干预措施。

关键词：糖尿病性白内障超声乳化手术白内障黄斑水肿危险因素

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Displaced orbits generated by solar sails for the hyperbolic and degenerated cases

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Acta Mechanica Sinica 2012年第1期28卷 211-220页

作者： Ming xu Shi-Jie xu Department of Aerospace Engineering School of AstronauticsBeihang University100191 BeijingChina

Displaced non-Keplerian orbits above planetary bodies can be achieved by orientating the solar sail normal to the sun line. The dynamical systems techniques are employed to analyze the nonlinear dynamics of a displaced orbit and different topologies of equilibria are yielded from the basic configurations of Hill＇s region, which have a saddlenode bifurcation point at the degenerated case. The solar sail near hyperbolic or degenerated equilibrium is quite unstable. Therefore, a controller preserving Hamiltonian structure is presented to stabilize the solar sail near hyperbolic or degenerated equilibrium, and to generate the stable Lissajous orbits that stay stable inside the stabilizing region of the controller. The main contribution of this paper is that the controller preserving Hamiltonian structure not only changes the instability of the equilibrium, but also makes the modified elliptic equilibrium become unique for the controlled system. The allocation law of the controller on the sail＇s attitude and lightness number is obtained, which verifies that the controller is realizable.

关键词： Solar sail Displaced orbit Stable Lissajous orbits Hyperbolic equilibrium Degenerated equilibrium

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Laboratory evaluation of high-friction thin overlays for pavement preservation

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 936-948页

作者： Ouming xu Rentao xu Lintong JIN School of Highway Chang’an UniversityXi’an 710064China School of Materials Science and Engineering Chang’an UniversityXi’an 710061China

Traditional asphalt concrete(AC)and stone matrix asphalt(SMA),which are used as thin asphalt overlays,are common maintenance strategies to enhancing ride quality,skid resistance,and ***,several studies have used a novel asphalt mixture known as a high-friction thin overlay(HFTO)to improve surface ***,it remains uncertain whether the laboratory properties of HFTO differ significantly from those of conventional *** study aims to evaluate the laboratory properties of HFTO mixtures and compare them with those of AC and *** mixtures with nominal maximum size of 9.5 mm were produced in the laboratory,and performance tests were conducted,including wheel tracking test,low temperature flexural creep test,moisture susceptibility test,Cantabro Abrasion Test,Marshall Test,sand patch test,British pendulum test,and indoor tire-rollingdown *** results showed that the HFTO exhibited a lower tire/pavement noise than the AC and ***,HFTO had superior high-temperature stability,larger macro texture,and higher skid resistance in comparison to those of AC,but lower than those of ***,HFTO mixtures may be considered a suitable replacement for traditional AC mixtures in regions where skid resistance and noise reduction are concerns.

关键词： road engineering pavement maintenance high friction thin overlay performance skid resistance tire/pavement noise

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Single Image Enhancement in Sandstorm Weather via Tensor Least Square

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IEEE/CAA Journal of Automatica Sinica 2020年第6期7卷 1649-1661页

作者： Guanlei xu Xiaotong Wang Xiaogang xu College of Computer and Information Engineering Zhejiang Gongshang UniversityHangzhou 310018China

In this paper,we present a tensor least square based model for sand/sandstorm removal in *** main contributions of this paper are as ***,an important intrinsic natural feature of outdoor scenes free of sand/sandstorm is found that the outlines in RGB channels are somewise similar,which discloses the physical validation using the tensor instead of the ***,a tensor least square optimization model is presented for the decomposition of edge-preserving base layers and *** model not only decomposes the color image(taken as an inseparable indivisibility)in X,Y directions,but also in Z direction,which meets the statistical feature of natural scenes and can physically disclose the intrinsic color *** model’s advantages are twofold:one is the decomposition of edgepreserving base layers and details that can be employed for contrast enhancement without artificial halos,and the other one is the color driving ability that makes the enhanced images as close to natural images as possible via the inherent color ***,the tensor least square optimization model based image enhancement scheme is discussed for the sandstorm weather ***,the experiments and comparisons with the stateof-the-art methods on real degraded images under sandstorm weather are shown to verify our method’s efficiency.

关键词： Image enhancement least square sandstorm weather tensor

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A high-entropy spinel ceramic oxide as the cathode for proton-conducting solid oxide fuel cells

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Journal of Advanced Ceramics 2022年第5期11卷 794-804页

作者： Yangsen xu Xi xu Lei BI School of Resource Environment and Safety Engineering University of South ChinaHengyang 421001China Department of Materials Imperial College London SW72BPUK

A high-entropy ceramic oxide is used as the cathode for the first time for proton-conducting solid oxide fuel cells(H-SOFCs).The Fe_(0.6)Mn_(0.6)Co_(0.6)Ni_(0.6)Cr_(0.6)O_(4)(FMCNC)high-entropy spinel oxide has been successfully prepared,and the in situ chemical stability test demonstrates that the FMCNC material has good stability against CO_(2).The first-principles calculation indicates that the high-entropy structure enhances the properties of the FMCNC material that surpasses their individual components,leading to lower O_(2)adsorption energy for FMCNC than that for the individual *** HSOFC using the FMCNC cathode reaches an encouraging peak power density(PPD)of 1052 mW·cm^(-2)at 700℃,which is higher than those of the H-SOFCs reported *** comparison was made between the high-entropy FMCNC cathode and the traditional Mn_(1.6)Cu_(1.4)O_(4)(MCO)spinel cathode without the high-entropy structure,revealing that the formation of the high-entropy material allows the enhanced protonation ability as well as the movement of the O p-band center closer to the Fermi level,thus improving the cathode catalytic *** a result,the high-entropy FMCNC has a much-decreased polarization resistance of 0.057Ω·cm^(2)at 700℃,which is half of that for the traditional MCO spinel cathode without the high-entropy *** excellent performance of the FMCNC cell indicates that the high-entropy design makes a new life for the spinel oxide as the cathode for HSOFCs,offering a novel and promising route for the development of high-performance materials for H-SOFCs.

关键词： proton-conducting oxides high-entropy oxides cathode solid oxide fuel cells(SOFCs)

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An Efficient Three-Factor Privacy-Preserving Authentication and Key Agreement Protocol for Vehicular Ad-Hoc Network

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China Communications 2021年第12期18卷 315-331页

作者： Tao xu Cheng xu Zisang xu School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China Key Laboratory for Embedded and Network Computing of Hunan Province Changsha 410082China

As an indispensable part of the Intelli-gent Transportation System(ITS),the vehicular ad-hoc network(VANET)has attracted widespread atten-tion from academia and *** order to ensure the security of VANET,vehicles need to be authen-ticated before accessing the *** existing authentication protocols in VANET adopt the Trusted Authority(TA)with centralized structure which is re-sponsible for the authentication tasks of all ***,the large-scale network consume a lot of computing resources,which leads to unacceptable de-lay in message transmission in *** reducing the computational cost of TA,an efficient three-factor privacy-preserving authentication and key agreement protocol was proposed in our *** from before,the RoadSide Unit(RSU)no longer acts as an intermediate node but is responsible for assisting user authentication,which lead to the computational cost of TA is very *** formal and informal analysis,our protocol demonstrates excellent ***-pared with previous studies,our work emerges advan-tages and superiorities in the following aspects:com-putational cost,communication cost,security proper-ties and functions,message loss ratio,and message *** data and evidence indicate that our protocol is an ideal choice for large-scale VANET.

关键词： authentication vehicular ad-hoc network security three-factor

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