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Petroleum Science 2018年第4期15卷 709-721页

作者： Yu-Ying Zhang Zhi-Liang He Shu jiang Shuang-Fang Lu Dian-Shi Xiao Guo-Hui Chen jian-hua zhao School of Geosciences China University of Petroleum (East China) Petroleum Exploration and Production Research Institute SINOPEC Energy and Geoscience Institute University of Utah

Control of various factors, including mineral components, primary productivity and redox level, on the total organic carbon(TOC) in the lower Cambrian black shale from southeastern margin of Upper Yangtze(Taozichong, Longbizui and Yanbei areas) is discussed in detail in this article. Mineral components in the study strata are dominated by quartz and clay minerals. Quartz in the Niutitang Formation is mainly of biogenic origin, and the content is in positive correlation with TOC, while the content of clay minerals is negatively correlated with TOC. Primary productivity, represented by the content of Mobio(biogenic molybdenum), Babio(biogenic barium) and phosphorus, is positively correlated with TOC. The main alkanes in studied samples are nCC, and odd–even priority values are closed to 1(0.73–1.13), which suggest the organic matter source was marine plankton. Element content ratios of U/Th and Ni/Co and compound ratio Pr/Ph indicate dysoxic–anoxic bottom water, with weak positive relative with TOC. In total, three main points can be drawn to explain the relationship between data and the factors affecting organic accumulation:(1) quartz-rich and clay-mineral-poor deep shelf–slope–basin environment was favorable for living organisms;(2) high productivity provided the material foundation for organic generation;(3) the redox conditions impact slightly on the content of organic matter under high productivity and dysoxic–anoxic condition.

关键词： Upper Yangtze Lower Cambrian Black shale Total organic carbon

ON THE DIVISION OF NORTH BOUNDARY OF SUBTROPICALZONE ACCORDING TO THE COMPOSITIONS AND PROPERTIES OF SOIL HUMUS

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Chinese Geographical Science 2002年第2期12卷 171-175页

作者： MA jian hua, zhao Qing liang, HAN Jin xian(College of Environment &Planning, Henan University, Kaifeng 475001, P.R. China) College of Environment & Planning Henan University Kaifeng P. R. China

In this paper predecessors′achievements about the division between subtropical zone and warm temperate zone on the south slope of Funiu Mountain are firstly summarized, and the cause why these viewpoints about the division are different also has been presented. Seven soil profiles at different heights above sea level are dug along the south slope of Funiu Mountain. Many compositions and properties of soil humus have been analyzed in laboratory. A comprehensive study has been made about the division according to the compositions and properties of soil humus with mathematical method. During the analysis process eight indexes have been used, such as altitude, organic carbon, humic acid (HA), fulvic acid (FA), the ratio of humic acid and fulvic acid (HA/FA), two extinction coefficients (E4,E6), and their ratio (E4/E6).The result indicates that the boundary is at about 1000 meters above sea level.

关键词： funiu mountain north boundary of subtropical zone soil humus

Host-Induced Gene Silencing of the Target Gene in Fungal Cells Confers Effective Resistance to the Cotton Wilt Disease Pathogen Verticillium dahliae

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Molecular Plant 2016年第6期9卷 939-942页

作者： Tao Zhang Yun Jin jian-hua zhao Feng Gao Bang-Jun Zhou Yuan-Yuan Fang Hui-Shan Guo State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing) Institute of Microbiology Beijing 100101 China University of the Chinese Academy of Sciencesl Beijing 1000491 China lhe Key Laboratory of Prevention and Control for Oasis Crop Disease Shihezi University Shihezi 832000 Xinjiang China Present address: Plant Science Innovation Center and Plant Pathology Department University of Nebraska Lincoln NE 68583 USA

Dear Editor Verticillium wilt, caused by the soil-borne fungus Verticillium dahliae, poses a major threat to a broad host range of more than 400 plant species, including economically important cotton （Bell, 1992）. V. dahliae is especially difficult to control because it persists in soil as resting structures, called microsclerotia, for several years in the absence of a host plant. The dormant microsclerotia are the primary infectious propagules and germinate when they are stimulated by root exudates. Infection of cotton roots by V. dahliae in soi~ naturally leads to the colonization of vascular tissues, from the parasitic to saprophytic phase, when mycelia and melanized dormancy microsclerotia are produced in the infected cotton, resulting in vessel blockage and cotton wilt disease （Gerik and Huisman, 1988）.

关键词： Gene silencing Verticillium wilt of cotton Verticillium dahliae

Epitaxial Growth and Magnetic Properties of NiMnAs Films on GaAs Substrates

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Chinese Physics Letters 2019年第1期36卷 65-69页

作者： Jia-Lin Ma Hai-Long Wang Xing-Min Zhang Shuai Yan Wen-Sheng Yan jian-hua zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Shanghai Synchrotron Radiation Facility Institute of Applied Physics Chinese Academy of Sciences National Synchrotron Radiation Laboratory University of Science and Technology of China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences

Single-phase Ni_(0.92)Mn_(1.08) As films with strained C_(1b) symmetry are grown on GaAs(001) substrates. In addition,a preferred epitaxial configuration of(110)-orientated Ni_(0.92)Mn_(1.08) As on(001)-orientated GaAs is revealed by synchrotron radiation measurement. The magnetic properties of the films are found to be significantly influenced by the growth temperature and the optimized growth temperature is determined to be ~370℃. According to the results of x-ray absorption spectroscopy, these phenomena can be attributed to the variation of the local electronic structure of the Mn atoms. Our work provides useful information for the further investigations of NiMnAs, which is a theoretically predicted half-metal.

关键词： Epitaxial Growth Magnetic Properties GaAs Substrates

Unusual Anomalous Hall Effect in a Co2MnSi/MnGa/Pt Trilayer

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Chinese Physics Letters 2020年第7期37卷 96-99页

作者： Shan Li Jun Lu Lian-Jun Wen Dong Pan Hai-Long Wang Da-Hai Wei jian-hua zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering&CAS Center of Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Beijing Academy of Quantum Information Science Beijing 100193China

An ultra-thin Co2MnSi(0.5 nm)/Mn Ga(1.5 nm) bilayer capped with Pt(5 nm) has been successfully grown by molecular-beam *** is a potential candidate of synthetic antiferromagnets due to antiferromagnetic coupling between Co2MnSi and MnGa,which is a promising skyrmion-racetrack-memory medium without skyrmion Hall effect after capping with a Pt *** humps in transverse Hall resistance loops are clearly observed in the temperature range from 260 to 400 *** anomaly is generally attributed to topological Hall effect,but other than that,we prove that non-uniform rotation of magnetic moments in the bilayer with magnetic field sweeping is also a possible mechanism contributed to the unusual hump.

关键词： layer. usual MnGa

Tunable Perpendicular Magnetic Anisotropy in Off-Stoichiometric Full-Heusler Alloy Co_2MnAl

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Chinese Physics Letters 2019年第6期36卷 79-82页

作者： Zhi-Feng Yu Jun Lu Hai-Long Wang Xu-Peng zhao Da-Hai Wei Jia-Lin Ma Si-Wei Mao jian-hua zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing Academy of Quantum Information Sciences

Off-stoichiometric full-Heusler alloy Co_2 MnAl thin films with different thicknesses are epitaxially grown on GaAs(001) substrates by molecular-beam epitaxy. The composition of the films, close to Co_(1.65)Mn_(1.35)Al(CMA),is determined by x-ray photoelectron spectroscopy and energy dispersive spectroscopy. Tunable perpendicular magnetic anisotropy(PMA) from 3.41 Merg/cm^3 to 1.88 Merg/cm^3 with the thickness increasing from 10 nm to 30 nm is found,attributed to the relaxation of residual compressive strain. Moreover, comparing with the ultrathin CoFeB/MgO used in the conventional perpendicular magnetic tunnel junction, the CMA electrode has a higher magnetic thermal stability with more volume involved. The PMA in CMA films is sustainable up to 300℃,compatible with semiconductor techniques. This work provides a possibility for the development of perpendicular magnetized full-Heusler compounds with high thermal stability and spin polarization.

关键词： Tunable Perpendicular Magnetic Anisotropy Full-Heusler Alloy Co2MnAl different thicknesses

Microstructures and mechanical properties of AZ91D/0Cr19Ni9 bimetal composite prepared by liquid-solid compound casting

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Transactions of Nonferrous Metals Society of China 2019年第1期29卷 51-58页

作者： jian-hua zhao Wen-qun zhao Shen QU Yan-qing ZHANG State Key Laboratory of Mechanical Transmission Chongqing University Chongqing 400044 China College of Materials Science and Engineering Chongqing University Chongqing 400044 China

The liquid-solid compound casting technology was used to produce the AZ91D/0Cr19Ni9 bimetal composite without and with hot dipping aluminium, respectively. The influences of Al coating on microstructures and mechanical properties of AZ91D/0Cr19Ni9 interface were investigated. The results showed that the mechanical bonding was obtained between AZ91D and bare steel 0Cr19Ni9 where a gap existed at the interface; the metallurgical bonding was formed between AZ91D and Al-coated 0Cr19Ni9, which could be divided into two different intermetallic layers: layer Ⅰ was mainly composed of α-Mg+β-Mg17Al12 eutectic structure and a small amount of MgAl2O4, and layer Ⅱ mainly comprised of Fe2Al5 intermetallic compound. Furthermore, the hardness value of interface was obviously higher than that of AZ91D matrix, and the average hardness values of layers Ⅰ and Ⅱ were HV 158 and HV 493, respectively. The shear strength of AZ91D/Al-coated 0Cr19Ni9 interface was higher than that of AZ91D/bare 0Cr19Ni9 interface, which confirmed that Al coating could improve the adhesive strength between AZ91D and 0Cr19Ni9 during liquid-solid compound casting process.

关键词： AZ91D 0Cr19Ni9 liquid-solid compound casting interface bonding shear strength

Ultrafast Magnetization Precession in Perpendicularly Magnetized L10-MnAl Thin Films with Co2 MnSi Buffer Layers

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Chinese Physics Letters 2020年第5期37卷 110-114页

作者： Si-Wei Mao Jun Lu Long Yang Xue-Zhong Ruan Hai-Long Wang Da-Hai Wei Yong-Bing Xu jian-hua zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083 Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100190 Beijing Academy of Quantum Information Science Beijing 100193 jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Collaborative Innovation Center of Advanced MicrostructuresSchool of Electronic Science and EngineeringNanjing UniversityNanjing 210093

Perpendicularly magnetized L10-MnAl thin films with Co2 MnSi bufer layers were prepared on GaAs(001)substrates by molecular-beam epitaxy(MBE).The samples with high crystalline quality show a maximum uniaxial perpendicular magnetic anisotropy constant of 1.4×10^7 erg/cm^*** spin dynamics with a magnetization precession frequency up to 200 GHz was investigated by using time-resolved magneto-optical Kerr effect(TRMOKE)measurements,from which the Gilbert damping constantαof epitaxial L10-MnAl thin films is evaluated to be less than *** work provides an important reference for analyzing the current-induced magnetization switching process in MnAl-based spintronic devices.

关键词： magnetization Gilbert anisotropy

Microstructures and mechanical properties of TC4/AZ91D bimetal prepared by solid-liquid compound casting combined with Zn/Al composite interlayer

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Transactions of Nonferrous Metals Society of China 2022年第4期32卷 1144-1158页

作者： jian-hua zhao Jing-jing SHANGGUAN Cheng GU Bing-yan JIN Yu SHI College of Materials Science and Engineering Chongqing UniversityChongqing 400044China State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China

To achieve Ti/Mg bimetallic composite with high strength and metallurgical bonding interface,Al interlayer and Zn/Al composite interlayer were used to prepare TC4/AZ91D bimetal composite with metallurgical bonding interface by solid-liquid compound casting,*** interlayer was prepared on the surface of TC4 alloy by hot dipping,and Zn/Al composite interlayer was prepared by electroplating *** results suggested that the phases across the interface were Al Ti andα(Al)+Mg_(21)(Al,Zn)_(17)when Zn/Al composite interlayer was *** Al interlayer was used as interlayer,Al Mg Ti ternary structure and Al_(12)Mg_(17)+δ-Mg eutectic structure were the main phases at the *** shear strength of TC4/AZ91D bimetal with Zn/Al composite interlayer was much higher than that with pure Al interlayer,and the value of the shear strength was increased from 48.5 to 67.4 *** models based on different compositions of the interface were established to explain the microstructure evolution of the interfacial zone.

关键词： Ti/Mg bimetal composite solid-liquid compound casting thermodynamic analysis microstructure mechanical properties

基于k-近邻域中心偏移的鲁棒性异常检测算法

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北京邮电大学学报 2017年第4期40卷 54-59页

作者：赵建龙曲桦赵季红西安交通大学软件学院西安710049 西安交通大学电子与信息工程学院西安710049 西安邮电大学通信与信息工程学院西安710061

针对大多数基于距离和密度的异常检测算法敏感于近邻参数k的问题,提出了一种鲁棒性异常检测标准——k-近邻域中心偏移异常因子(COOF).数据结点的k-近邻域中心位置会随着近邻参数k的变化而发生迁移,鉴于异常结点要比正常结点对k-近邻域... 详细信息

针对大多数基于距离和密度的异常检测算法敏感于近邻参数k的问题,提出了一种鲁棒性异常检测标准——k-近邻域中心偏移异常因子(COOF).数据结点的k-近邻域中心位置会随着近邻参数k的变化而发生迁移,鉴于异常结点要比正常结点对k-近邻域中心位置偏移量的影响更大,通过累加因递增k而产生的偏移量来表征数据结点的异常程度,并在COOF基础上实现了鲁棒性的异常检测算法.通过综合数据和真实数据的实验仿真可知,COOF不仅对近邻参数k具有鲁棒性,而且相比基于距离的k最近邻算法、基于局部距离的异常因子和基于密度的局部异常因子具有更稳定且更准确的异常检测性能.

关键词：异常检测 k最近邻局部异常因子中心偏移异常因子