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| 1 | Dynamic tensile behaviour and crack propagation of coal under coupled static-dynamic loading显示文摘The fracture behaviour and crack propagation features of coal under coupled static-dynamic loading conditions are important when evaluating the dynamic failure of coal.In this study,coupled static-dynamic loading tests are conducted on Brazilian disc(BD)coal specimens using a modified split Hopkinson pressure bar(SHPB).The effects of the static axial pre-stress and loading rate on the dynamic tensile strength and crack propagation characteristics of BD coal specimens are studied.The average dynamic indirect tensile strength of coal specimens increases first and then decreases with the static axial pre-stress increasing.When no static axial pre-stress is applied,or the static axial pre-stress is 30%of the static tensile strength,the dynamic indirect tensile strength of coal specimens shows an increase trend as the loading rate increases.When the static axial pre-stress is 60%of the static tensile strength,the dynamic indirect tensile strength shows a fluctuant trend as the loading rate increases.According to the crack propagation process of coal specimens recorded by high-speed camera,the impact velocity influences the mode of crack propagation,while the static axial pre-stress influences the direction of crack propagation.The failure of coal specimens is a coupled tensile-shear failure under high impact velocity.When there is no static axial pre-stress,tensile cracks occur in the vertical loading direction.When the static axial pre-stress is applied,the number of cracks perpendicular to the loading direction decreases,and more cracks occur in the parallel loading direction. | Xianjie Hao Weisheng Du Yixin Zhao Zhuowen Sun Qian Zhang Shaohua Wang Haiqing Qiao | 2020 | International Journal of Mining Science and Technology2020，30，5： | 8 |
| 2 | Synthesis of pennogenin utilizing the intact skeleton of diosgenin显示文摘The first synthesis of pennogenin, an aglycone of bioactive components of Chinese traditional medicine named Chonglou(Paris), starting from diosgenin, has been reported, which displays a new strategy of utilizing the resource compounds. According to this new strategy, the full and rational utilization of the intact skeleton and functional groups of starting material has been realized in the conversion of diosgenin to pennogenin. The key step for synthesis of pen-nogenin is the regioselective transformation of cholest-5-en-16,22-dion-3,26-diol to cholest- 5,16-dien-22-on-3,26-diol, which can be used to synthesize other bioactive steroids such as cephalostatin and OSW-1. | TIAN Weisheng XU Qihai CHEN Ling ZHAO Chunfeng | 2004 | Science China Chemistry2004，47，2： | 7 |
| 3 | Recent progress of integrated circuits and optoelectronic chips显示文摘Integrated circuits(ICs)and optoelectronic chips are the foundation stones of the modern information society.The IC industry has been driven by the so-called'Moore's law'in the past 60 years,and now has entered the post Moore's law era.In this paper,we review the recent progress of ICs and optoelectronic chips.The research status,technical challenges and development trend of devices,chips and integrated technologies of typical IC and optoelectronic chips are focused on.The main contents include the development law of IC and optoelectronic chip technology,the IC design and processing technology,emerging memory and chip architecture,brain-like chip structure and its mechanism,heterogeneous integration,quantum chip technology,silicon photonics chip technology,integrated microwave photonic chip,and optoelectronic hybrid integrated chip. | Yue HAO Shuiying XIANG Genquan HAN Jincheng ZHANG Xiaohua MA Zhangming ZHU Xingxing GUO Yahui ZHANG Yanan HAN Ziwei SONG Yan LIU Ling YANG Hong ZHOU Jiangyi SHI Wei ZHANG Min XU Weisheng ZHAO Biao PAN Yangqi HUANG Qi LIU Yimao CAI Jian ZHU Xin OU Tiangui YOU Huaqiang WU Bin GAO Zhiyong ZHANG Guoping GUO Yonghua CHEN Yong LIU Xiangfei CHEN Chunlai XUE Xingjun WANG Lixia ZHAO Xihua ZOU Lianshan YAN Ming LI | 2021 | Science China(Information Sciences)2021，64，10： | 7 |
| 4 | Magnetic resonance imaging with three-dimensional fast imaging employing steady-state acquisition with phase-cycled and short T1 inversion recovery pulse sequence for evaluating brachial plexus injury显示文摘There is a large amount of fat in the postganglionic segment of the brachial plexus nerve.The use of short T1 inversion recovery pulse sequence may improve signal strength of the brachial plexus postganglionic segment.The present study revealed that the combination of three-dimensional fast imaging employing steady-state acquisition with phase-cycled and short T1 inversion recovery pulse sequence clearly displayed the anatomical morphology and structure of the brachial plexus nerve,together with maximum intensity projection,volume rendering and other three-dimensional reconstruction techniques.Our results suggested that this method is also suitable for providing accurate assessment and diagnosis of the site,severity and scope of brachial plexus injury. | Dianxiu Ning Meiyu Sun Bo Sun Li Zhao Weisheng Zhang Lijun Wang Shaowu Wang Ailian Liu Jianlin Wu Zhijin Lang Di Ning Guanfu Liu Xiaochen Ji Xiufeng Wang | 2011 | Neural Regeneration Research2011，6，14： | 7 |
| 5 | Regional wind power forecasting model with NWP grid dataoptimized显示文摘Unlike the traditional fossil energy, wind, asthe clean renewable energy, can reduce the emission of thegreenhouse gas. To take full advantage of the environ-mental benefits of wind energy, wind power forecastinghas to be studied to overcome the troubles brought by thevariable nature of wind. Power forecasting for regionalwind farm groups is the problem that many power systemoperators care about. The high-dimensional feature setswith redundant information are frequently encounteredwhen dealing with this problem. In this paper, two kinds offeature set construction methods are proposed which canachieve the proper feature set either by selecting thesubsets or by transforming the original variables withspecific combinations. The former method selects thesubset according to the criterion of minimal-redundancy-maximal-relevance (mRMR), while the latter does sobased on the method of principal component analysis(PCA). A locally weighted learning method is alsoproposed to utilize the processed feature set to producethe power forecast results. The proposed model is simpleand easy to use with parameters optimized automatically.Finally, a case study of 28 wind farms in East China isprovided to verify the effectiveness of the proposedmethod. | Zhao WANG Weisheng WANG Bo WANG | 2017 | Frontiers in Energy2017，11，2： | 6 |
| 6 | Generation and manipulation of chiral terahertz waves in the three-dimensional topological insulator Bi2Te3显示文摘Arbitrary manipulation of broadband terahertz waves with flexible polarization shaping at the source has great potential in expanding numerous applications,such as imaging,information encryption,and all-optical coherent control of terahertz nonlinear phenomena.Topological insulators featuring unique spinmomentum-locked surface state have already exhibited very promising prospects in terahertz emission,detection,and modulation,which may lay a foundation for future on-chip topological insulator-based terahertz systems.However,polarization-shaped terahertz emitters based on topological insulators with an arbitrarily manipulated temporal evolution of the amplitude and the electric-field vector direction have not yet been explored.We systematically investigated the terahertz radiation from topological insulator Bi2Te3 nanofilms driven by femtosecond laser pulses and successfully realized the generation of efficient chiral terahertz waves with controllable chirality,ellipticity,and principal axis.The convenient engineering of the chiral terahertz waves was interpreted by a photogalvanic effect(PGE)-induced photocurrent,while the linearly polarized terahertz waves originated from linear PGE-induced shift currents.Our work not only provides further understanding of femtosecond coherent control of ultrafast spin currents but also describes an effective way to generate spin-polarized terahertz waves at the source. | Haihui Zhao Xinhou Chen Chen Ouyang Hangtian Wang Deyin Kong Peidi Yang Baolong Zhang Chun Wang Gaoshuai Wei Tianxiao Nie Weisheng Zhao Jungang Miao Yutong Li Li Wang Xiaojun Wu | 2020 | Advanced Photonics2020，2，6： | 6 |
| 7 | Intelligent identification of two-dimensional nanostructures by machine-learning optical microscopy显示文摘Two-dimensional (2D)materials and their heterostructures,with wafer-scale synthesis methods and fascinating properties,have attracted significant interest and triggered revolutions in corresponding device applications.However,facile methods to realize accurate,intelligent,and large-area characterizations of these 2D nanostructures are still highly desired.Herein,we report the successful application of machine-learning strategy in the optical identification of 2D nanostructures.The machine-leaming optical identification (MOI)method endows optical microscopy with intelligent insight into the characteristic color information of 2D nanostructures in the optical photograph.The experimental results indicate that the MOI method enables accurate,intelligent,and large-area characterizations of graphene,molybdenum disulfide,and their heterostructures, including identifications of the thickness,existence of impurities,and even stacking order.With the convergence of artificial intelligence and nanoscience,this intelligent identification method can certainly promote fundamental research and wafer-scale device applications of 2D nanostructures. | Xiaoyang Lin Zhizhong Si Wenzhi Fu Jianlei Yang Side Guo Yuan Cao Jin Zhang Xinhe Wang Peng Liu Kaili Jiang Weisheng Zhao | 2018 | Nano Research2018，11，12： | 5 |
| 8 | Effect of homogenization annealing on internal residual stress distribution and texture in ME21 magnesium alloy extruded plates显示文摘The distribution of residual stresses through thickness of 5 mm-thick ME21 magnesium alloy extruded plates was analyzed non-destructively using short-wavelength X-ray diffraction(SWXRD),and the effect of homogenization annealing before extrusion on the residual stress was discussed.The classic d 0 method with an annealed stress-free reference specimen was employed to determine the residual stress of the extruded plates.The residual stress results showed that the gradient of residual stress in the transverse direction was larger than that of the extrusion direction.The homogenization process prior to extrusion weaken the formed sample’s texture.The maximum residual stress of the as-extruded plate was reduced,and the residual stress distribution was homogenized. | Yong Lian Pengfei Ji Jin Zhang Xiaomin Yuan Weisheng Xu Yongle Zhao Jiahao Mo Lin Zheng Shitao Dou | 2019 | Journal of Magnesium and Alloys2019，7，1： | 3 |
| 9 | Integration of high-performance spin-orbit torque MRAM devices by 200-mm-wafer manufacturing platform显示文摘We demonstrate in-plane field-free-switching spin-orbit torque(SOT)magnetic tunnel junction(MTJ)devices that are capable of low switching current density,fast speed,high reliability,and,most importantly,manufactured uniformly by the 200-mm-wafer platform.The performance of the devices is systematically studied,including their magnetic properties,switch-ing behaviors,endurance and data retention.The successful integration of SOT devices within the 200-mm-wafer manufactur-ing platform provides a feasible way to industrialize SOT MRAMs.It is expected to obtain excellent performance of the devices by further optimizing the MTJ film stacks and the corresponding fabrication processes in the future. | Hongchao Zhang Xiangyue Ma Chuanpeng Jiang Jialiang Yin Shuqin Lyu Shiyang Lu Xiantao Shang Bowen Man Cong Zhang Dandan Li Shuhui Li Wenjing Chen Hongxi Liu Gefei Wang Kaihua Cao Zhaohao Wang Weisheng Zhao | 2022 | Journal of Semiconductors2022，43，10： | 2 |
| 10 | Research progress of residual stress determination in magnesium alloys显示文摘With the research development of the magnesium alloys,the deformation or stress corrosion induced by residual stress(RS)attracted extensive interests in industry and research efforts extensive.However,there are relatively few studies on the RS of magnesium alloys in the world.The generation cause of RS in magnesium alloys was analyzed at first.Several methods of determinate the RS,including destructive methods(drilling hole,crack compliance,layer exfoliation etc.)and non-destructive methods(X-ray Diffraction,Neutron Diffraction,Short Wavelength X-ray Diffraction)were summarized.The factors that influence the measuring accuracy of XRD method were emphasized.The research trends of RS in magnesium alloys were put forward. | Xiaomin Yuan Jin Zhang Yong Lian Chang Du Weisheng Xu Yongle Zhao Jiahao Mo | 2018 | Journal of Magnesium and Alloys2018，6，3： | 2 |
| 11 | Method for measuring velocity of shallow water flow for soil erosion with an electrolyte tracer 显示文摘 | Lei Tingwu Xia Weisheng Zhao Jun | 2005 | Journal of Hydrology2005，301，： | 1 |
| 12 | Novel weighted least squares support vector regression for thrust estimation on performance deterioration of aeroengine 显示文摘 | SU Weisheng ZHAO Yongping SUN Jianguo | 2012 | Transactions of Nanjing University of Aeronautics & Astmnanties2012，29，1： | 1 |
| 13 | Molecular cloning, characterization and expression of a novel jasmonate-dependent defensin gene from Ginkgo biloba显示文摘 | Guoan Shen Yongzhen Pang Weisheng Wu Zhiqi Miao Hongmei Qian Lingxia Zhao Xiaofen Sun Kexuan Tang | 2005 | Journal of Plant Physiology2005，，10： | 1 |
| 14 | Method for measuring velocity of shallow water flow for soil erosion with anelectrolyte tracer显示文摘 | Lei Tingwu Xia Weisheng Zhao Jun | 2005 | Journal of Hydrology2005，301，1： | 1 |
| 15 | Method for measuring velocity of shallow water flow for soil erosion with an electrolyte tracer显示文摘 | Lei Tingwu Xia Weisheng Zhao Jun | 2005 | Journal of Hydrology2005，301，14： | 1 |
| 16 | Wind and Photovoltaic Power Time Series Data Aggregation Method Based on an Ensemble Clustering and Markov Chain显示文摘Reducing the input wind and photovoltaic power time series data can improve the efficiency of time sequential simulations.In this paper,a wind and photovoltaic power time series data aggregation method based on an ensemble clustering and Markov chain(ECMC)is proposed.The ECMC method can effectively reduce redundant information in the data.First,the wind and photovoltaic power time series data were divided into scenarios,and ensemble clustering was used to cluster the divided scenarios.At the same time,the Davies-Bouldin Index(DBI)is adopted to select the optimal number of clusters.Then,according to the temporal correlation between wind and photovoltaic scenarios,the wind and photovoltaic clustering results are merged and reduced to form a set of combined typical day scenarios that can reflect the characteristics of historical data within the calculation period.Finally,based on the Markov Chain,the state transition probability matrix of various combined typical day scenarios is constructed,and the aggregation state sequence of random length is generated,and then,the combined typical day scenarios of wind and photovoltaic were sampled in a sequential one-way sequence according to the state sequence and then are built into a representative wind and photovoltaic power time series aggregation sequence.A provincial power grid was chosen as an example to compare the multiple evaluation indexes of different aggregation methods.The results show that the ECMC aggregation method improves the accuracy and efficiency of time sequential simulations. | Jingxin Jin Lin Ye Jiachen Li Yongning Zhao Peng Lu Weisheng Wang Xuebin Wang | 2022 | CSEE Journal of Power and Energy Systems2022，8，3： | 1 |
| 17 | High voltage-controlled magnetic anisotropy and interface magnetoelectric effect in sputtered multilayers annealed at high temperatures显示文摘Voltage control of magnetism promises great energy efficiency in writing magnetic memory. Here, using Cr/Mo/CoFeB/MgO multilayers stable under high annealing temperatures up to 590°C, we significantly enhance the interfacial crystallinity, thereby the interface-originated perpendicular magnetic anisotropy(PMA), voltage-controlled magnetic anisotropy(VCMA), and interface magnetoelectric(ME) effect. High interfacial PMA of 1.35 mJ/m^2, VCMA coefficient of-138 fJ/(V m), and interface ME coefficient, which is 2-3 orders of magnitude larger than ab initio calculation results are simultaneously achieved after annealing at 500°C. These promising results enabled by the industry-applicable sputtering process will pave the way for highdensity voltage-controlled spintronic devices. | LeZhi Wang Xiang Li Taisuke Sasaki Kin Wong GuoQiang Yu ShouZhong Peng Chao Zhao Tadakatsu Ohkubo Kazuhiro Hono WeiSheng Zhao KangLong Wang | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，7： | 1 |
| 18 | Stateful implication logic based on perpendicular magnetic tunnel junctions显示文摘As the conventional von Neumann architecture meets critical limitations of data transfer bandwidth and energy consumption,perpendicular magnetic anisotropy magnetic tunnel junction based processing-in-memory paradigm attracts extensive attention as a promising substitute thanks to its nonvolatility,low-power switching,fast access and infinite endurance.In this work,we propose and experimentally demonstrate a new spintronic implication logic gate that consists of two parallel perpendicular magnetic anisotropy magnetic tunnel junctions with different diameters.Material implication and furthermore NAND logic functions are implemented by all electrically-controlled operations.The reliability of this structure is verified,especially in sub-20 nm node,which shows great potential for large-density processing-in-memory applications. | Wenlong CAI Mengxing WANG Kaihua CAO Huaiwen YANG Shouzhong PENG Huisong LI Weisheng ZHAO | 2022 | Science China(Information Sciences)2022，65，2： | 1 |
| 19 | Perpendicular magnetic anisotropy based spintronics devices in Pt/Co stacks under different hard and flexible substrates显示文摘The magnetic properties in substrate/Pt/Co multilayers, such as perpendicular magnetic anisotropy(PMA), are of particular interest for spintronic devices. In particular, it is important to obtain a strong PMA on the flexible substrate in the field of wearable devices and structural health monitoring.However, the different stacks deposition and regulation conditions on the magnetic properties of the films lack systematic research. Here, we investigate the magnetic properties in Pt/Co structures with different hard and flexible substrates, layer thicknesses, and the different deposition temperatures of the buffer layer.We found that the coercive field and magnetodynamic behavior of the films change with these factors. Moreover, depositing the buffer layer under high temperature can effectively adjust the crystalline state of the films, thus affecting the performance of the films. After depositing the buffer layer at 800℃, our films can obtain a better crystalline state and PMA. The measurement results of the magneto-optical Kerr microscope show that the magnetic domain wall motion of the films can be controlled by different substrate and buffer layer conditions. It was expected that ultra-fast magnetic moment switching can be achieved by optimizing the conditions to reduce the power consumption of the device. The experimental results also show that the optimized film conditions can also obtain strong PMA on the flexible substrate. These findings help to understand magnetic properties in these structures and show the promising prospect for wearable devices and other spintronic devices. | Sylvain EIMER Houyi CHENG Jinji LI Xueying ZHANG Chao ZHAO Weisheng ZHAO | 2023 | Science China(Information Sciences)2023，66，2： | 1 |
| 20 | Antiferromagnetic spintronics: An overview and outlook显示文摘Over the pas few decades,the diversified development of antiferomagnetic spintronics has made antiferomagnets(AFMs)interesting and very useful.After tough challenges,the applications of AFMs in electronic devices have transitioned from focusing on the interface coupling features to achieving the manipulation and detection of AFMs.As AFMs are internally magnetic,taking full use of AFMs for information storage has been the main target of research.In this paper,we provide a comprehensive description of AFM spintronics applications from the interface coupling,read-out operations,and writing manipulations perspective.We examine the early use of AFMs in magnetic recordings and conventional magnetoresistive random-access memory(MRAM),and review the latest mechanisms of the manipulation and detection of AFMs.Finally,based on exchange bias(EB)manipulation,a high-performance EB-MRAM is introduced as the next generation of AFM-based memories,which provides an effective method for read-out and writing of AFMs and opens a new era for AFM spintronics. | Danrong Xionga Yuhao Jiang Kewen Shi Ao Du Yuxuan Yao Zongxia Guo Daoqian Zhu Kaihua Cao Shouzhong Peng Wenlong Cai Dapeng Zhu Weisheng Zhao | 2022 | Fundamental Research2022，2，4： | 1 |
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