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| 1 | 评价注聚效果的Hall导数曲线法显示文摘目前用于矿场注聚效果评价的Hall曲线是一条累积曲线,对注聚动态不敏感,据此难以及时准确地进行注聚效果早期评价。提出了Hall导数曲线法。Hall导数与吸水指数互为倒数。实例应用表明,Hall导数曲线法是一种更具敏感性的注聚效果评价方法,保留了Hall曲线法的功能,弥补了Hall曲线法的不足。 | 康晓东 冯国智 张贤松 孙福街 | 2007 | 中国海上油气(工程)2007，19，3： | 15 |
| 2 | Rule-based Fault Diagnosis of Hall Sensors and Fault-tolerant Control of PMSM显示文摘Hall sensor is widely used for estimating rotor phase of permanent magnet synchronous motor(PMSM). And rotor position is an essential parameter of PMSM control algorithm, hence it is very dangerous if Hall senor faults occur. But there is scarcely any research focusing on fault diagnosis and fault-tolerant control of Hall sensor used in PMSM. From this standpoint, the Hall sensor faults which may occur during the PMSM operating are theoretically analyzed. According to the analysis results, the fault diagnosis algorithm of Hall sensor, which is based on three rules, is proposed to classify the fault phenomena accurately. The rotor phase estimation algorithms, based on one or two Hall sensor(s), are initialized to engender the fault-tolerant control algorithm. The fault diagnosis algorithm can detect 60 Hall fault phenomena in total as well as all detections can be fulfilled in 1/138 rotor rotation period. The fault-tolerant control algorithm can achieve a smooth torque production which means the same control effect as normal control mode (with three Hall sensors). Finally, the PMSM bench test verifies the accuracy and rapidity of fault diagnosis and fault-tolerant control strategies. The fault diagnosis algorithm can detect all Hall sensor faults promptly and fault-tolerant control algorithm allows the PMSM to face failure conditions of one or two Hall sensor(s). In addition, the transitions between health-control and fault-tolerant control conditions are smooth without any additional noise and harshness. Proposed algorithms can deal with the Hall sensor faults of PMSM in real applications, and can be provided to realize the fault diagnosis and fault-tolerant control of PMSM. | SONG Ziyou LI Jianqiu OUYANG Minggao GU Jing FENG Xuning LU Dongbin | 2013 | Chinese Journal of Mechanical Engineering2013，26，4： | 12 |
| 3 | 关于有限群的s-半正规子群I(英文)显示文摘分类了含有非平凡的s 半正规子群的有限单群 :G是含有非平凡s 半正规子群H的单群当且仅当G是下 4型群之一 :(1)G =Ap,H Ap-1,p为素数 ;(2 )G =PSL(n ,q)且H是一条直线或一个超平面的稳定子群 ,|G H| =(qn- 1) / (q- 1) =pa,其中p和n均为素数 ;(3)G =PSL(2 ,11) ,H A5;(4 )G =M2 2 ,H M2 1或G =M11,H M10 .还得到了一个Schur Zassenhaus型的定理 :假设有限群G含有一个s 半正规的Hallπ′ 子群 ,则 :(1)G ∈Cπ;(2 )进而如果G没有截段同构于PSL(2 ,q) ,其中q是一个Mersenne素数 ,则G ∈Dπ. | 王坤仁 | 2003 | 四川师范大学学报(自然科学版)2003，26，6： | 10 |
| 4 | 基于开关式Hall传感器的飞轮低速控制显示文摘研究了基于TMS320LF2407A的飞轮用无刷直流电动机的数字化速度控制方案。为提高飞轮系统的可靠性,通常在电机定子上安装开关式Hall器件来检测转子的位置。但由于Hall所能提供的位置脉冲有限,在低速时,仅利用Hall提供的位置信息,很难得到精确的速度估计。为此,文中提出改善基于Hall的无刷直流电机速度估计性能的两种方法:一是增加Hall数量,二是标定Hall安装偏差。不同条件下的实验结果表明,本文所提的方法是有效的。 | 郝敬然 王舒雁 | 2006 | 航天控制2006，24，1： | 8 |
| 5 | DUCTILEBRITTLETRANSITION OF POLYCRYSTALLINE Ni_3Al WITH VARYING GRAIN SIZE显示文摘It is known that in B (un)doped Ni 3Al polycrystals, the dependence of yield strength on grain size follows the Hall Petch relationship: σ y= σ 0+ K y d -1/2 , and the slope K y can be reduced by B doping owing to the lowering of grain boundary resistance to slip transmission. If the intergranular cracking in polycrystalline Ni 3Al occurs from the microcavity along the grain boundaries, the effective external tensile stress for the propagation of the crack like microcavity along the grain boundaries can be deduced as: σ f= σ i+ K u d -1/2 , where K u reflects the effects of such factors as environment, strain rate, boron doping and the orientation of the grain boundary on the trend of intergranular cracking. For loaded polycrystalline Ni 3Al, it should be competitive between the intergranular cracking and slip transmission across the grain boundary. Therefore, comparing the varieties of both σ y and σ f with grain size, the dependence of ductile brittle transition on grain size, and the effects of the above factors on ductile brittle transition can be expected. The model also predicts that there exists a critical grain size for the ductile brittle transition of polycrystalline Ni 3Al alloys, and B doping can increase the critical grain size due to the reduction of the slope K y and the increase of K u. The reported experimental results verified the above model. | G. W. Han, D. Feng and C. S. Lee Central Iron & Steel Research Institute, Beijing 100081, China Dept. Physical & Mater. Sci., City University of Hong Kong Hong Kong, China | 1999 | 中国有色金属学会会刊:英文版1999，9，S1： | 7 |
| 6 | 儿童龋齿管理Hall技术的研究进展显示文摘2006年苏格兰萨瑟兰郡的牙医Hall和卡洛斯蒂地区的牙医Innes等人,对1988—2001年期间使用了乳磨牙金属预成冠的259例儿童进行了回顾性分析,13年间这些儿童共使用978个乳磨牙金属预成冠,这些乳磨牙金属预成冠的使用与传统的乳磨牙金属预成冠不同,在粘接这些金属预成冠之前没有进行局麻、去龋、牙体预备等处理,但成功率却与其他治疗方法相近,因此Hall在此基础上提出了Hall技术。 | 安钰 | 2016 | 广东医学2016，37，15： | 6 |
| 7 | Monty Hall Dilemma的困难原因探讨显示文摘采用Monty Hall Dilemma的经典研究范式,探讨了大学生被试在不同提示条件下对MHD问题的解决情况,结果发现只有在条件关系提示下,MHD的作业成绩才得到了明显的改善,但是正确率也只有35.7%。这表明MHD问题困难的原因很可能是多方面的,如认为主持人的行为完全是随机事件,很难意识到参与者的最初选择与主持人打开特定盒子间的三种条件关系;多数被试作出选择的理由是非理性的,如“坚持第一选择,相信自己的直觉”;不能正确判断MHD问题的内在概率关系以及缺乏认真思考的动力等。 | 邱江 张庆林 | 2006 | 心理科学2006，29，1： | 5 |
| 8 | Roles of initial current carrier in the distribution of field-aligned current in 3-D Hall MHD simulations显示文摘A three-dimensional (3-D) Hall MHD simulation is carried out to study the roles of initial current carrier in the topology of magnetic field, the generation and distribu- tion of field aligned currents (FACs), and the appearance of Alfvén waves. Consid- ering the contribution of ions to the initial current, the topology of the obtained magnetic field turns to be more complex. In some cases, it is found that not only the traditional By quadrupole structure but also a reversal By quadrupole structure appears in the simulation box. This can explain the observational features near the diffusion region, which are inconsistent with the Hall MHD theory with the total ini- tial current carried by electrons. Several other interesting features are also emerged. First, motions of electrons and ions are decoupled from each other in the small plasma region (Hall effect region) with a scale less than or comparable with the ion inertial length or ion skin depth di=c/ωp. In the non-Hall effect region, the global magnetic structure is shifted in +y direction under the influence of ions with initial y directional motion. However, in the Hall effect region, magnetic field lines are bent in ?y direction, mainly controlled by the motion of electrons, then By is generated. Second, FACs emerge as a result of the appearance of By. Compared with the prior Hall MHD simulation results, the generated FACs shift in +y direction, and hence the dawn-dusk symmetry is broken. Third, the Walén relation in our simulations is consistent with the Walén relation in Hall plasma, thus the presence of Alfvén wave is confirmed. | ZHANG XianGuo PU ZuYin MA ZhiWei ZHOU XuZhi | 2008 | Science China(Technological Sciences)2008，51，3： | 4 |
| 9 | 永磁同步电机多开关HALL的微步进标定方法及其矢量控制系统显示文摘使用大减速比减速器的卫星天线指向机构难以从传动链末端反推获得电机的精确位置信息。将永磁同步电机(PMSM)定子安装开关HALL用于细分电角度空间,构成一种位置传感器是较好的解决方案。本文提出一种基于微步进控制理论的开关HALL输出信号与电机磁极位置定标方法。该方法无需借用外部设备即可完成多开关HALL与电机控制用磁极位置电角度信号之间的对应关系。实验结果表明,依照该方法建立的基于多开关HALL的PMSM矢量控制系统动态响应快、转速稳定度高,在存在较大摩擦转矩情况下转速精度达±2%,具有驱动效率高,易于数字实现、稳定可靠等优点。 | 刘建章 刘刚 李光军 | 2009 | 微电机2009，42，10： | 4 |
| 10 | Structural stability improvement, Williamson Hall analysis and band-gap tailoring through A-site Sr doping in rare earth based double perovskite La2NiMnO6显示文摘The structural,morphological and optical properties of single-phase polycrystalline La2-xSrxNiMnO6(x=0,0.3 and 0.5),synthesized by solid state reaction were investigated.The samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)/energy dispersive analysis of X-rays(EDAX),Raman spectroscopy and diffuse reflectance spectroscopy(DRS)to elucidate the role of A-site Sr-doping in double perovskite La2 NiMnO6.Rietveld analysis of XRD patterns revealed that all the samples have monoclinic structure with space group P21/n.Positive gradient in the Williamson Hall plots revealed the presence of tensile strain in all the samples.The morphological studies revealed that average grain size increases along with appreciable decrease in porosity with Sr doping.The Ni/Mn antisite disorder was introduced in the La2 NiMnO6 by Sr-doping confirmed by an increase in the full width at half maximum(FWHM)and decrease in intensity of the Raman modes at around 540 and 665 cm-1 which correspond to the antisymmetric stretching and symmetric stretching modes,respectively.DRS results reveal that the band gap in La2 NiMnO6 can be tuned down by Sr-doping to a value of1.37 eV(very close to 1.40 eV,considered as optimum value for better efficiency of a solar cell).Thus,Sr-doped La2 NiMnO6 may be of prime importance for applications in solar cells. | Shah Aarif Ul Islam Mohd Ikram | 2019 | Rare Metals2019，38，9： | 4 |
| 11 | Prediction of large-gap quantum spin hall insulator and Rashba-Dresselhaus effect in two-dimensional g-TIA (A = N, P, As, and Sb) monolayer films显示文摘A new family of two-dimensional (2D) topological insulators (TIs) comprising g-TIA (A = N, P, As, and Sb) monolayers constructed by T1 and group-V elements is predicted by first-principles calculations and molecular-dynamics (MD) simulations. The geometric stability, band inversion, nontrivial edge states, and electric polarity are investigated to predict the large-gap quantum spin Hall insulator and Rashba-Dresselhaus effects. The MD results reveal that the g-T1A monolayers remain stable even at room temperature. The g-T1A (A = As, Sb) monolayers become TIs under the influence of strong spin-orbit couplings with large bulk bandgaps of 131 and 268 meV, respectively. A single band inversion is observed in each g-T1A (A = As, Sb) monolayer, indicating a nontrivial topological nature. Furthermore, the topological edge states are described by introducing a sufficiently wide zigzag-nanoribbon. A Dirac point in the middle of the bulk gap connects the valence- and conduction-band edges. The Fermi velocity near the Dirac point with a linear band dispersion is -0.51 × 106 m/s, which is comparable to that of many other 2D nanomaterials. More importantly, owing to the broken inversion symmetry normal to the plane of the g-T1A films, a promising Rashba-Dresselhaus effect with the parameter up to 0.85 eV-A is observed in the g-T1A (A = As, Sb) monolayers. Our findings regarding 2D topological g-T1A monolayers with room-temperature bandgaps, intriguing topological edge states, and a promising Rashba-Dresselhaus effect are of fundamental value and suggest potential applications in nanoelectronic devices. | Xinru Li Ying Dai Yandong Ma Wei Wei Lin Yu Baibiao Huang | 2015 | Nano Research2015，8，9： | 3 |
| 12 | Inverse spin Hall effect in ITO/YIG exited by spin pumping and spin Seebeck experiments显示文摘Spin currents, which are excited in indium tin oxide(ITO)/yttrium iron garnet(YIG) by the methods of spin pumping and spin Seebeck effect, are investigated through the inverse spin Hall effect(ISHE). It is demonstrated that the ISHE voltage can be generated in ITO by spin pumping under both in-plane and out-of-plane magnetization configurations.Moreover, it is observed that the enhancement of spin Hall angle and interfacial spin mixing conductance can be achieved by an appropriate annealing process. However, the ISHE voltage is hardly seen in the presence of a longitudinal temperature gradient. The absence of the longitudinal spin Seebeck effect can be ascribed to the almost equal thermal conductivity of ITO and YIG and specific interface structure, or to the large negative temperature dependent spin mixing conductance. | 朱科建 林伟坚 苏仰涛 石海滨 孟洋 赵宏武 | 2019 | Chinese Physics B2019，28，1： | 3 |
| 13 | Photonic spin Hall effect in PT symmetric metamaterials显示文摘We proposed and demonstrated that PT symmetric metamaterials could be used to achieve enhanced spin Hall effect(SHE)of light.We find that when laser mode is excited in PT symmetric system,the enhanced SHE could be obtained in both transmitted and reflected beams.In addition,as exceptional points(EPs)of PT symmetric system can happen for both p-and s-polarizations,the enhanced SHE of reflected light can function for both horizontally and vertically polarized incident beams.Particularly,these EPs can lead to unidirectional reflectionlessness,asymmetric SHE with maximum contrast ratio of 48 is obtained by launching light beams near EPs.Our work opens up a new path to obtain enhanced transverse displacement for both reflected and transmitted light and enables more opportunities in manipulating photonic SHE. | Yang-Yang Fu Yue Fei Da-Xing Dong You-Wen Liu | 2019 | Frontiers of physics2019，14，6： | 3 |
| 14 | 共蒸发制备GaSb多晶薄膜的研究显示文摘GaSb的禁带宽度为0.72eV,是热光伏电池的理想材料。采用共蒸发的方法,在普通玻璃衬底上生长GaSb多晶薄膜。通过XRD谱、Hall及透射反射谱测试,研究了Ga、Sb源的蒸发温度、衬底温度以及薄膜厚度对薄膜的结构特性和光电特性的影响。研究表明,随衬底温度的升高、薄膜厚度的增加,晶粒尺寸逐渐增大;随衬底温度的升高、Ga源温度的降低以及厚度的增加,迁移率逐渐上升,迁移率最高可达172cm2/(V.s);随衬底温度的降低、Ga源温度的提高以及厚度的增加,载流子浓度逐渐增加。 | 阮建明 隋妍萍 李涛 何炜瑜 蔡宏琨 张德贤 | 2012 | 功能材料2012，43，4： | 3 |
| 15 | The E×B drift instability in Hall thruster using 1D PIC/MCC simulation显示文摘The E×B drift instability is studied in Hall thruster using one-dimensional particle in cell(PIC)simulation method.By using the dispersion relation,it is found that unstable modes occur only in discrete bands in k space at cyclotron harmonics.The results indicate that the number of unstable modes increases by increasing the external electric field and decreases by increasing the radial magnetic field.The ion mass does not affect the instability wavelength.Furthermore,the results confirm that there is an instability with short wavelength and high frequency.Finally,it is shown that the electron and ion distribution functions deviate from the initial state and eventually the instability is saturated by ion trapping in the azimuthal direction.Also for light mass ion,the frequency and phase velocity are very high that could lead to high electron mobility in the axial direction. | Zahra Asadi Mehdi Sharifian Mojtaba Hashemzadeh Mahmood Borhani Zarandi Hamidreza Ghomi Marzdashti | 2020 | Chinese Physics B2020，29，2： | 2 |
| 16 | 具有不同等离子体β值的Hall MHD重联中的低频波研究显示文摘数值研究具有不同等离子体β值(等离子体热压与磁压之比)的Hall MHD重联过程.对于β值在0.5≤β≤6.5的算例,稳态重联率(?)A/(?)t|st为0.15≥(?)A/(?)t|st≥0.095.本文研究β值在上述范围内的Hall MHD重联中的波动.通过快速傅里叶变换(FFT),将平面外磁场By分量和xz平面内的速度分量vx,vz位于给定点的时间序列转换为功率谱.结果表明,By,vx,vz功率谱的频率范围为Ωci<ω<8Ωci,其中Ωci为离子回旋频率.随着β值增大,功率谱峰值能量降低,并且朝着低频端移动.对于电场E采用最小方差分析法(MVA)可以确定波的传播方向k,波矢k与局地磁场B之间的夹角α随β值增大而增大.对于β值最大的算例3(β=6.5),α<28°.上述结果表明,k准平行于B.为了研究波的偏振特征,在垂直于k的平面内画出E的矢端图.三个算例的矢端图均表明,波动具有右旋偏振特征,在算例1(β=0.5)中矢端图为右旋椭圆偏振,而在算例2(β=2.5)和算例3(β=6.5)中矢端图变成复杂的右旋偏振图形,这些均为哨声波的典型特征.本文的研究为快速磁重联与哨声波之间提供了一种可能的联系. | 李奕 金曙平 杨红昂 刘绍亮 | 2007 | 空间科学学报2007，27，2： | 2 |
| 17 | Quantum transport in topological semimetals under magnetic fields (Ⅱ)显示文摘We review our recent works on the quantum transport, mainly in topological semimetals and also in topological insulators, organized according to the strength of the magnetic field. At weak magnetic fields, we explain the negative magnetoresistance in topological semimetals and topological insulators by using the semiclassical equations of motion with the nontrivial Berry curvature. We show that the negative magnetoresistance can exist without the chiral anomaly. At strong magnetic fields, we establish theories for the quantum oscillations in topological Weyl, Dirac, and nodal-line semimetals. We propose a new mechanism of 3D quantum Hall effect, via the 'wormhole' tunneling through the Weyl orbit formed by the Fermi arcs and Weyl nodes in topological semimetals. In the quantum limit at extremely strong magnetic fields, we find that an unexpected Hall resistance reversal can be understood in terms of the Weyl fermion annihilation. Additionally, in parallel magnetic fields, longitudinal resistance dips in the quantum limit can serve as signatures for topological insulators. | Hai-Peng Sun Hai-Zhou Lu | 2019 | Frontiers of physics2019，14，3： | 2 |
| 18 | Semiclassical dynamics and nonlinear charge current显示文摘Electron conductivity is an important material property that can provide a wealth of information about the underlying system. Especially, the response of the conductivity with respect to electromagnetic fields corresponds to various nonlinear charge currents, which have distinct symmetry requirements and hence can be used as efficient probes of different systems. To help the band-structure engineering of such nonlinear currents, a universal treatment of electron dynamics up to second order expressed in the basis of the unperturbed states are highly useful. In this work, we review the general semiclassical framework of the nonlinear charge currents. | Yang Gao | 2019 | Frontiers of physics2019，14，3： | 2 |
| 19 | Tubular algebras and affine Kac-Moody algebras显示文摘The purpose of this paper is to construct quotient algebras L(A)1C/I(A) of complex degenerate composition Lie algebras L(A)1C by some ideals, where L(A)1C is defined via Hall algebras of tubular algebras A, and to prove that the quotient algebras L(A)1C/I(A) are isomorphic to the corresponding affine Kac-Moody algebras. Moreover, it is shown that the Lie algebra Lre(A)1C generated by A-modules with a real root coincides with the degenerate composition Lie algebra L(A)1C generated by simple A-modules. | Zheng-xin CHEN & Ya-nan LIN School of Mathematics and Computer Science, Pujian Normal University, Fuzhou 350007, China School of Mathematical Sciences, Xiamen University, Xiamen 361005, China | 2007 | Science China Mathematics2007，50，4： | 2 |
| 20 | A general and simple method for evaluating the electrical transport performance of graphene by the van der Pauw–Hall measurement显示文摘Expected for many promising applications in the field of electronics and optoelectronics, a reliable method for the characterization of graphene electrical transport properties is desired to predict its device performance or provide feedback for its synthesis.However, the commonly used methods of extracting carrier mobility from graphene field effect transistor or Hall-bar is time consuming, expensive, and significantly affected by the device fabrication process other than graphene itself.Here we reported a general and simple method to evaluate the electrical transport performance of graphene by the van der Pauw–Hall measurement.By annealing graphene in vacuum to remove the adsorbed dopants and then exposing it in ambient surroundings, carrier mobility as a function of density can be measured with the increase of carrier density due to the dopant re-adsorption from the surroundings.Further, the relationship between the carrier mobility and density can be simply fitted with a power equation to the first level approximation, with which any pair of measured carrier mobility and density can be normalized to an arbitrary carrier density for comparison.We experimentally demonstrated the reliability of the method, which is much simpler than making devices and may promote the standard making for graphene characterization. | Fangzhu Qing Yang Shu Linsen Qing Yuting Niu He Guo Shuyi Zhang Chunlin Liu Changqing Shen Wanli Zhang Samuel S.Mao Wenjuan Zhu Xuesong Li | 2018 | Science Bulletin2018，63，22： | 2 |
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