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Structure and properties of indium-doped ZnO films prepared by RF magnetron sputtering under different pressures

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Rare Metals 2022年第9期41卷 3239-3243页

作者： Li-Ping Peng A-Ling He Liang Fang Xiao-fei yang Research Center of Laser Fusion Chinese Academy of Engineering PhysicsMianyang621900China Department of Applied Physics Chongqing UniversityChongqing400030China Science and Technology Information Center Chinese Academy of Engineering PhysicsMianyang621900China

High conductive and transparent In-doped ZnO thin films were deposited on glass substrates by radio-frequency(RF)magnetron sputtering at 250℃.Argon gas was used as the sputtering gas,and its pressure varies from 0.1 to 4.0 *** influences of deposition pressure on the structural,electrical and optical properties of the films were investigated by means of X-ray diffraction(XRD),scanning electron microscope(SEM)and Hall and transmittance *** optical constant of the films was estimated from transmittance data using a nonlinear programming *** is found that the deposition pressure affects the properties of the films *** film deposited at 2.0 Pa shows the optimal crystal quality with a high transmittance of 85%in the visible range and a low resistivity of 2.4×10^(−3)Ω·cm and can thus be used as a transparent electrode.

关键词： ZnO thin films Transparent conductive oxide Optical constant Magnetron sputtering

Control of topological phase transitions in Dirac semimetal films by exchange fields

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Chinese Physics B 2017年第1期26卷 386-390页

作者： fei yang Hai-Long Wang Hui Pan Department of Physics Beihang University Belting 100191 China

The exchange field effects on topological Dirac semimetal（DSM） films are discussed in this article. A topological phase transition can be controlled by tuning the exchange field together with the quantum confinement effects. What is more interesting is that the system can transit into the quantum anomalous Hall（QAH） state from the topologically trivial state（Z2 = 0） or from the topologically nontrivial state（Z2 = 1）, depending on the thickness of the DSM films. This provides a useful mechanism to realize the QAH state from the DSM.

关键词： exchange field Dirac semimetal quantum anomalous Hall state quantum spin Hall state

Mapping Soil Texture Based on Field Soil Moisture Observations at a High Temporal Resolution in an Oasis Agricultural Area

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Pedosphere 2016年第5期26卷 699-708页

作者： yang Renmin LIU Feng ZHANG Ganlin ZHAO Yuguo LI Decheng yang Jinling yang fei yang Fan State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008(China) University of Chinese Academy of Sciences Beijing 100049(China)

Due to the almost homogeneous topography in low relief areas, it is usually difficult to make accurate predictions of soil properties using topographic covariates. In this study, we examined how time series of field soil moisture observations can be used to estimate soil texture in an oasis agricultural area with low relief in the semi-arid region of northwest China. Time series of field-observed soil moisture variations were recorded for 132 h beginning at the end of an irrigation event during which the surface soil was *** correlation between two time-adjacent soil moisture conditions was used to select the factors for fuzzy c-means clustering. In each of the ten generated clusters, soil texture of the soil sample with the maximum fuzzy membership value was taken as the cluster centroid. Finally, a linearly weighted average was used to predict soil texture from the centroids. The results showed that soil moisture increased with the increase of clay and silt contents, but decreased with the increase of sand content. The spatial patterns of soil moisture changed during the entire soil drying phase. We assumed that these changes were mainly caused by spatial heterogeneity of soil texture. A total of 64 independent samples were used to evaluate the prediction accuracy. The root mean square error(RMSE)values of clay, silt and sand were 1.63, 2.81 and 3.71, respectively. The mean relative error(RE) values were 9.57% for clay, 3.77% for silt and 12.83% for sand. It could be concluded that the method used in this study was effective for soil texture mapping in the low-relief oasis agricultural area and could be applicable in other similar irrigation agricultural areas.

关键词： digital soil mapping fuzzy c-means clustering low relief particle-size distribution semi-arid region water content

Theory and reality of antivirals against SARS-CoV-2

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World Journal of Clinical Cases 2021年第23期9卷 6663-6673页

作者： Bo Zhao Teng-fei yang Rui Zheng Department of Pulmonary and Critical Care Medicine Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina Department of Health Management and Family Medicine Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

At present,over 180 million people have been infected with severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)worldwide and there have been more than 3.8 million deaths due to the ***,specific effective antiviral treatment for this infectious disease is *** the beginning of the epidemic,relevant cellular and animal experiments of antiviral treatment for SARS-CoV-2 were conducted based on the prior studies of SARS-CoV and Middle East respiratory syndrome *** antivirals were preliminarily validated to be potentially effective in the clinical *** as the epidemic continued and more studies were carried out,the efficacy of these antiviral drugs became *** paper reviews the pharmacology and application of interferon,lopinavir/ritonavir,ribavirin,chloroquine,arbidol,favipiravir,remdesivir,and thymosinα1 in coronavirus disease *** actual effect of these drugs remains ***,the efficacy and safety of these drugs for patients with coronavirus disease 2019 still need to be explored.

关键词： SARS-CoV-2 Antivirals Efficacy Safety Middle East respiratory syndrome coronavirus

铀对α-Al_(2)O_(3)中氢与本征点缺陷相互作用的影响

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原子与分子物理学报 2025年第5期42卷 123-129页

作者：杨飞龙向鑫胡立张桂凯陈长安中国工程物理研究院材料研究所江油621908

在长期高温服役过程中,铀床的氚渗透泄露问题是聚变堆涉氚系统中需要关注的焦点之一,而一种行之有效的解决思路是在内壁制备阻氚涂层.然而,服役过程中通过热扩散渗入涂层内部的铀可能在阻氚涂层氢行为中起作用,进而影响其服役可靠性.基... 详细信息

在长期高温服役过程中,铀床的氚渗透泄露问题是聚变堆涉氚系统中需要关注的焦点之一,而一种行之有效的解决思路是在内壁制备阻氚涂层.然而,服役过程中通过热扩散渗入涂层内部的铀可能在阻氚涂层氢行为中起作用,进而影响其服役可靠性.基于此,采用第一性原理计算方法,研究了铀对α-Al_(2)O_(3)中氢与本征点缺陷相互作用的影响.结果发现,铀对α-Al_(2)O_(3)中空位型本征点缺陷及氢相关缺陷的存在形式、电荷态及相对稳定性有重要影响.从形成能观点来看,铀对α-Al_(2)O_(3)中空位型本征点缺陷及氢相关缺陷的形成有利,且α-Al_(2)O_(3)中空位型点缺陷对氢的捕陷能力因铀的引入显著增加.研究结果对α-Al_(2)O_(3)基内壁阻氚涂层在氚工艺系统铀床中应用的可靠性评估具有重要的指导意义.

关键词：铀本征点缺陷氢相关缺陷相互作用 α-Al_(2)O_(3)

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Rolling reduction-dependent deformation mechanisms and tensile properties in aβtitanium alloy

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Journal of Materials Science & Technology 2022年第9期104卷 183-193页

作者： Zhaoxin Du Qiwei He Ruirun Chen fei Liu Jingyong Zhang fei yang Xueping Zhao Xiaoming Cui Jun Cheng School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering China University of Mining and TechnologyXuzhou 221008China Waikato Centre for Advance Materials and Manufacturing School of EngineeringUniversity of WaikatoHamilton 3240New Zealand State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

This work investigated the dependence of deformation mechanisms and mechanical properties on cold rolling reductions of the metastable TB8 titanium *** shown that the crystal orientation of the matrix changes with the increasing level of reduction,leading to the activation of complex deformation mechanisms in the *** the rolling reduction is 10%,the deformation mechanisms are dominated by dislocations and{332}deformation *** the reductions increase to 20%-50%,the secondary deformation twinning(SDT)is triggered in primary deformation twins besides the primary kink band is ***,the secondary kink bands and{332}twins have be observed in the primary kink *** the reduction reaches to 60%,the deformation mechanisms are dominated by dislocations and deformation ***,the matrix refined by crisscrossing among the twins,kink bands and other deformation mechanisms during cold rolling,which shortens the dislocation mean free path and then affects the strength and shape of the *** dynamic Hall-Petch effect and the interaction between multi-scale deformed structures control the work hardening behavior of the alloy.

关键词： TB8 titanium alloy Deformation mechanisms Kink band variants Twinning Mechanical properties

Three-dimensional weighting reconstruction algorithm for circular cone-beam CT under large scan angles

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Nuclear Science and Techniques 2017年第8期28卷 75-82页

作者： Ya-fei yang Ding-Hua Zhang Kui-Dong Huang Fu-Qiang yang Zong-Zhao Gao Key Lab of Contemporary Design and Integrated Manufacturing Technology (Northwestern Polytechnical University) Ministry of Education Xi'an 710072 China

Improving imaging quality of cone-beam CT under large cone angle scan has been an important area of CT imaging research. Considering the idea of conjugate rays and making up missing data, we propose a three-dimensional(3D) weighting reconstruction algorithm for cone-beam CT. The 3D weighting function is added in the back-projection process to reduce the axial density drop and improve the accuracy of FDK algorithm. Having a simple structure, the algorithm can be implemented easily without rebinning the native cone-beam data into coneparallel beam data. Performance of the algorithm is evaluated using two computer simulations and a real industrial component, and the results show that the algorithm achieves better performance in reduction of axial intensity drop artifacts and has a wide range of application.

关键词：重建算法锥束CT 三维角度扫描加权性能评价轴向强度 FDK算法

Sedimentology of reefal buildups of the Xiannüdong Formation(Cambrian Series 2),SW China

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Journal of Palaeogeography 2019年第2期8卷 170-180页

作者： Hao Tang Stephen Kershaw Xiu-Cheng Tan Hong Liu fei Li Cheng Shen fei-Fan Lu Xue-fei yang Division of Key Laboratory of Carbonate Reservoir of CNPC Southwest Petroleum University Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Mineral Shandong University of Science and Technology Department of Life Sciences Brunel University

The reefs in the Xiannüdong Formation(Cambrian Series 2) are the oldest archaeocyathan–microbial bioconstructions in China,but the details of their microbial structures have not been previously ***,a new section at Tangjiahe site,northern Sichuan Province,contains very well-preserved microbial fabrics that provide these details,and is described in this *** Tangjiahe section contains three levels of reefal buildups that were constructed by a consortium of archaeocyaths and calcimicrobes in varying *** lowest(oldest) reefal buildup is a calcimicrobial biostrome,possibly in the form of a wide mound with a low relief(unconfirmed due to outcrop limitation),which was formed by Epiphyton with rare small archaeocyaths,and is sandwiched by flat-pebble *** middle reefal buildup is a high-relief calcimicrobial mound,enclosed by oolites,that was built by intergrown Renalcis and *** fossils are uncommon,and were bound into the framework by microbial *** uppermost(youngest) reefal buildup is a low-relief archaeocyathan mound lacking calcimicrobes but partly having microbially-clotted textures attached on *** built or aided archaeocyaths to form the framework of Tangjiahe *** three buildups formed in low-energy lagoons behind ooid shoals,and the environment was nutrient-rich due to terrigenous influx from adjacent *** reefs thus resemble most Early Cambrian reefs,in settings consistent with eutrophic,calm environments,and are characterized by the domination or aid of calcimicrobial components in framework construction.

关键词： Microbialites Archaeocyaths Reefs Cambrian Series 2 Southwest China

Transport Coefficients of High Temperature SF6 in Local Thermodynamic Equilibrium Using a Phenomenological Approach

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Chinese Physics Letters 2014年第3期31卷 99-102页

作者： WANG Wei-Zong RONG Ming-Zhe yang fei WU Yi State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 Qian Xuesen Laboratory of Space Technology China Academy of Space Technology Beijing 100094

The transport coefficients of high temperature sulfur hexafluoride （SF6） plasmas in local thermodynamic equilibrium are calculated using collision integrals derived in a phenomenological approach which could be a valuable tool in the calculation of complete data sets for complex mixtures, including interactions hardly handled in the accurate multipotential methods. A systematic comparison with transport coefficients obtained using an old data set and experimental test is performed to check the reliability of the proposed approach in evaluating transport cross sections.

关键词： SULFUR hexafluoride RESEARCH PLASMA (Ionized gases) -- Research THERMODYNAMICS -- Research PHENOMENOLOGY PHYSICS research