|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Molecular dynamics simulation of mechanical properties of TATB/fluorine-polymer PBXs along different surfaces显示文摘The mechanical properties of PBXs composed of the well-known insensitive explo-sive TATB (1,3,5-Triamino-2,4,6-trinitrobenzene) crystal and four kinds of typical fluo-rine-polymers, i.e. poly (vinylidene difluoride) (PVDF), polychlorotrifluoroethylene (PCTFE), fluo-rine rubber (F2311) and fluorine resin (F2314) individually, have been simulated by molecular dy-namics (MD) method. The results show that the mechanical properties of TATB can be effectively improved by blending with a small amount of fluorine-polymers. Different mechanical properties of PBXs are obtained by putting fluorine-polymer binders parallel to different crystalline surfaces. The whole effect of improving mechanical properties is found to be (010)?(100)>(001). | XIAO Jijun1, HUANG Yucheng1, HU Yingjie1,2 & XIAO Heming1 1. Department of Chemistry, Nanjing University of Science and Technology, Nanjing 210094, China 2. Department of Chemistry, Nanjing Xiaozhuang College, Nanjing 210017, China Correspondence should be addressed to Xiao Heming (email: xiao@mail.njust.edu.cn) | 2005 | Science China Chemistry2005，48，6： | 19 |
| 2 | Calculation of band structure in (101)-biaxially strained Si显示文摘The structure model used for calculation was defined according to Vegard's rule and Hooke's law. Calculations were performed on the electronic structures of(101)-biaxially strained Si on relaxed Si1-X GeX alloy with Ge fraction ranging from X = 0 to 0.4 in steps of 0.1 by CASTEP approach. It was found that [±100] and [00±1] valleys(-4) splitting from the [0±10] valley(-2) constitute the conduction b0and(CB) edge,that valence band(VB) edge degeneracy is partially lifted and that the electron mass is un-altered under strain while the hole mass decreases in the [100] and [010] directions. In addition,the fitted dependences of CB splitting energy,VB splitting energy and indirect bandgap on X are all linear. | SONG JianJun ZHANG HeMing HU HuiYong FU Qiang | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，4： | 12 |
| 3 | Valence band structure of strained Si/(111)Si_(1-x)Ge_x显示文摘The strained Si techique has been widely adopted in the high-speed and high-performance devices and circuits. Based on the valence band E-k relations of strained Si/(111)Si1-xGex, the valence band and hole effective mass along the [111] and [-110] directions were obtained in this work. In comparison with the relaxed Si, the valence band edge degeneracy was partially lifted, and the significant change was observed band structures along the [111] and [-110] directions, as well as in its corresponding hole effective masses with the increasing Ge fraction. The results obtained can provide valuable references to the investigation concerning the Si-based strained devices enhancement and the conduction channel design related to stress and orientation. | SONG JianJun, ZHANG HeMing, HU HuiYong, DAI XianYing & XUAN RongXi Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi’an 710071, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，3： | 9 |
| 4 | Longitudinal,transverse,density-of-states,and conductivity masses of electrons in(001),(101) and(111) biaxiallystrained-Si and strained-Si_(1-x)Ge_x显示文摘In this study,the electron effective masses,including longitudinal,transverse,density-of-states and conductivity effective masses,have been systematically investigated in(001),(101) and(111) biaxially strained Si and Si1-xGex.It is found that the effect of strain on the longitudinal and transverse masses can be neglected,that the density-of-states masses in(001) and(110) biaxially strained Si and Si1-xGex materials decrease significantly with increasing Ge fraction(x),and that the conductivity masses along typical orientations in(001) and(110) strained Si and Si1-xGex.are obviously different from those in relaxed Si.The quantitative results obtained from this work may provide valuable theoretical references to understanding strained materials physics and studying conduction channel design related to stress and orientations in the strained devices. | SONG JianJun YANG Chao ZHANG HeMing HU HuiYong ZHOU ChunYu WANG Bin | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，11： | 5 |
| 5 | Preparation,crystal structure and quantum chemical investigation of[Li(NTO) (H_2O)_2]显示文摘[Li(NTO)(H2O2]was prepared by mixing the aqueous solution of 3-nitro-1,2,4-triazol-5-one (NTO) and lithium hydroxide. The crystal structure of [Li(NTO)(H2O)2] was determined by single crystal diffraction analysis. The crystal is monoclinic, space group P21/n with crystal parameters of α =0.7420(2) nm, b=0.344 9(1) nm, c=2.490 6(3) nm,β=94.89(1)°, Z=4, Dc=1.799 g.cm-3, V=0.635 nm3,μ= 1.591 cm-1, F(000) = 392. The final R is 0.051. The MNDO MO calculation shows that the coordinate bonds of title compound possess certain extent of covalent character. O2 atom of NTO anion is bonded to Li atom; the nitro group will be lost first when NTO is decomposed. | SONG Jirong , CHEN Zhaoxu , XIAO Heming , HU Rongzu and LI Fuping Department of Chemical Engineering, Northwest University, Xi’ an 710069, China Department of Chemistry, Nanjing University of Science and Technology, Nanjing 210094, China Xi’an Modern Chemistry Research Institute, Xi’ an 710065, China | 1999 | Chinese Science Bulletin1999，44，3： | 5 |
| 6 | Hole mobility enhancement of Si by rhombohedral strain显示文摘The strain technology is an effective way to improve hole mobility and CMOS device performance. Tetragonal strain leading to hole mobility enhancement in strained Si (001) has been verified by two aspects of theories and experiments. In this paper, we aim to study rhombohedral strain effect on the hole mobility of Si, which results from growing on the (111) oriented relaxed Si1 xGex substrate. It is found that structure transformation of Si from cubic to trigonal system occurs under the biaxial tensile stress imposed by the (111) substrate and that its corresponding averaged hole mobility increases about one time at most in comparison with one of unstrained Si. The results can provide valuable reference to the understanding of the strained Si material physics and its design. | SONG JianJun ZHANG HeMing HU HuiYong WANG XiaoYan WANG GuanYu | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，8： | 4 |
| 7 | Penetration depth at various Raman excitation wavelengths and stress model for Raman spectrum in biaxially-strained Si显示文摘The carrier mobility of Si material can be enhanced under strain,and the stress magnitude can be measured by the Raman spectrum.In this paper,we aim to study the penetration depths into biaxially-strained Si materials at various Raman excitation wavelengths and the stress model corresponding to Raman spectrum in biaxially-strained Si.The experimental results show that it is best to use 325 nm excitation to measure the material stress in the top strained Si layer,and that one must pay attention to the distortion of the buffer layers on measuring results while 514 nm excitation is also measurable.Moreover,we established the stress model for Raman spectrum of biaxially-strained Si based on the Secular equation.One can obtain the stress magnitude in biaxially-strained Si by the model,as long as the results of the Raman spectrum are given.Our quantitative results can provide valuable references for stress analysis on strained materials. | SONG JianJun YANG Chao HU HuiYong DAI XianYing WANG Cheng ZHANG HeMing | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，11： | 3 |
| 8 | Recognition and localization of strawberries from 3D binocular cameras for a strawberry picking robot using coupled YOLO/Mask R-CNN显示文摘To solve the problem of high labour costs in the strawberry picking process,the approach of a strawberry picking robot to identify and find strawberries is suggested in this study.First,1000 images including mature,immature,single,multiple,and occluded strawberries were collected,and a two-stage detection Mask R-CNN instance segmentation network and a one-stage detection YOLOv3 target detection network were used to train a strawberry identification model which classified strawberries into two categories:mature and immature.The accuracy ratings for YOLOv3 and Mask R-CNN were 93.4%and 94.5%,respectively.Second,the ZED stereo camera,triangulation,and a neural network were used to locate the strawberry in three dimensions.YOLOv3 identification accuracy was 3.1 mm,compared to Mask R-CNN of 3.9 mm.The strawberry detection and positioning method proposed in this study may effectively be used to supply the picking robot with a precise location of the ripe strawberry. | Heming Hu Yutaka Kaizu Hongduo Zhang Yongwei Xu Kenji Imou Ming Li Jingjing Huang Sihui Dai | 2022 | International Journal of Agricultural and Biological Engineering2022，15，6： | 1 |
| 9 | Computer Simulation of Turbulent Flow through a Hydraulic Turbine Draft Tube显示文摘Based on the Navier-Stokes equations and the standard k-ε turbulence model, this paper presents the derivation of the governing equations for the turbulent flow field in a draft tube. The mathematical model for the turbulent flow through a draft tube is set up when the boundary conditions, including the inlet boundary conditions, the outlet boundary conditions and the wall boundary conditions, have been implemented. The governing equations are formulated in a discrete form on a staggered grid system by the finite volume method. The second-order central difference approximation and hybrid scheme are used for discretization. The computation and analysis on internal flow through a draft tube have been carried out by using the simplec algorithm and cfx-tasc flow software so as to obtain the simulated flow fields. The calculation results at the design operating condition for the draft tube are presented in this paper. Thereby, an effective method for simulating the internal flow field in a draft tube has been explored. | HU Ying CHENG Heming WANG Quanlong YU Zhikun | 2006 | Wuhan University Journal of Natural Sciences2006，11，3： | 1 |
| 10 | Growth of strained Si1-xGex layer by UV/UHV/CVD 显示文摘 | Hu Huiyong Zhang Heming Dai Xianying | 2005 | Chinese Journal of Semiconductors2005，26，4： | 1 |
| 11 | Study on Si-SiGe three-dimension CMOS integrant circuits 显示文摘 | Hu Huiyong Zhang Heming Jia Xinzhang | 2007 | Chinese Journal of Semiconductors2007，28，5： | 1 |
| 12 | Study on Si-SiGe three-dimension CMOS integrant circuits显示文摘 | Hu Huiyong Zhang Heming Jia Xinzhang | 2007 | Chinese Journal of Semiconductors2007，28，5： | 1 |
| 13 | Study on Si-SiGe three-dimensional CMOS integrated circuits显示文摘 | Hu Huiyong Zhang Heming Jia Xinzhang | 2007 | Chinese Journal of Semiconductors2007，28，5： | 1 |
| 14 | Transport current model of SiGe HBT显示文摘 | Hu Huiyong Zhang Heming Dai Xianying | 2006 | Chinese Journal of Semiconductors2006，27，6： | 1 |
| 15 | Effects of Macroparticle Sizes on Two-phase Mixture Discharge Under DC Voltage显示文摘随着放电等离子体在各个领域应用的不断扩大,两相体放电问题越来越重要,需要解决的基础问题之一即是两相体中放电发生、发展的特点和规律及影响因素。采用21种不同的介质材料研究直流电压下两相体放电的效应,由实验结果可知介质的介电常数对放电路径基本无影响,而介质颗粒的粒径大小对两相体放电路径的选择起决定作用,即粒径效应。此外,对颗粒介电常数、电场畸变、光电离作用和颗粒荷电等几个方面进行研究,可知两相体放电的粒径效应与颗粒粒径大小紧密相关。 | YAO Wenjun HE Zhenghao DENG Heming WANG Guoli ZHANG Man MA Jun LI Jin YE Qizheng HU Hui | 2012 | 中国电机工程学报2012，32，13： | 1 |
| 16 | Method for C/N ratio estimation using Mask R-CNN and a depth camera for organic fraction of municipal solid wastes显示文摘Fast assessment of the initial carbon to nitrogen ratio(C/N)of organic fraction of municipal solid waste(OFMSW)is an important prerequisite for automatic composting control to improve efficiency and stability of the bioconversion process.In this study,a novel approach was proposed to estimate the C/N of OFMSW,where an instance segmentation model was applied to predict the masks for the waste images.Then,by combining the instance segmentation model with the depth-camera-based volume calculation algorithm,the volumes occupied by each type of waste were obtained,therefore the C/N could be estimated based on the properties of each type of waste.First,an instance segmentation dataset including three common classes of OFMSW was built to train mask region-based convolutional neural networks(Mask R-CNN)model.Second,a volume measurement algorithm was proposed,where the measurement result of the object was derived by accumulating the volumes of small rectangular cuboids whose bottom area was calculated with the projection property.Then the calculated volume was corrected with linear regression models.The results showed that the trained instance segmentation model performed well with average precision scores AP_(50)=82.9,AP_(75)=72.5,and mask intersection over unit(Mask IoU)=45.1.A high correlation was found between the estimated C/N and the ground truth with a coefficient of determination R2=0.97 and root mean square error RMSE=0.10.The relative average error was 0.42%and the maximum error was only 1.71%,which indicated this approach has potential for practical applications. | Jingjing Huang Hongduo Zhang Xu Xiao Jingqi Huang Jingxin Xie Liang Zhang Heming Hu Sihui Dai Ming Li Yongwei Xu | 2021 | International Journal of Agricultural and Biological Engineering2021，14，5： | 0 |
| 17 | Design and performance test of a novel UAV air-assisted electrostatic centrifugal spraying system显示文摘In order to improve the deposition and uniformity of the pesticide sprayed by the agricultural spraying drone,this study designed a novel spraying system,combining air-assisted spraying system with electrostatic technology.First,an air-assisted electrostatic centrifugal spray system was designed for agricultural spraying drones,including a shell,a diversion shell,and an electrostatic ring.Then,experiments were conducted to optimize the setting of the main parameters that affect the charge-to-mass ratio,and outdoor spraying experiments were carried out on the spraying effect of the air-assisted electrostatic centrifugal spray system.The results showed the optimum parameters were that the centrifugal rotation speed was 10000 r/min,the spray pressure was 0.3 MPa,the fan rotation speed was 14000 r/min,and the electrostatic generator voltage was 9 kV;The optimum charge-to-mass ratio of the spray system was 2.59 mC/kg.The average deposition density of droplets on the collecting platform was 366.1 particles/cm^(2) on the upper layer,345.1 particles/cm^(2) on the middle layer,and 322.5 particles/cm^(2) on the lower layer.Compared to the results of uncharged droplets on the upper,middle,and lower layers,the average deposition density was increased by 34.9%,30.4%,and 30.2%,respectively,and the uniformity of the distribution of the droplets at different collection points was better. | Heming Hu Yutaka Kaizu Jingjing Huang Kenichi Furuhashi Hongduo Zhang Xu Xiao Ming Li Kenji Imou | 2022 | International Journal of Agricultural and Biological Engineering2022，15，5： | 0 |
| 18 | Numerical Simulation of Unsteady Turbulent Flow through a Francis Turbine显示文摘This paper introduces the 3D numerical simulation of unsteady turbulent flow in the entire flow passage of a Francis turbine with computational fluid dynamics (CFD) technology. The boundary conditions have been implemented based on the 3D averaged Navier-Stokes equations. The governing equations are discreted on space by the finite volume method and on time step by the finite difference method. The 3D unsteady turbulent flow in an entire Francis turbine model is calculated successfully using the CFX-TASCflow software and RNG k-ε turbulence model. Transient flow fields are simulated in the spiral case, the distributor, the runner, and the draft tube for the optimum operating condition. Meanwhile, the velocity and pressure at any points in the flow fields can be obtained so as to provide the great value on the performance prediction. By means of the numerical simulation in a flow field, it is verified that every component in a Francis turbine model is designed reasonably. The basis for the further researches on hydraulic turbines is also built. | HU Ying CHENG Heming HU Ji LI Xirong | 2011 | Wuhan University Journal of Natural Sciences2011，16，2： | 0 |
| 19 | Electrical transport properties of focused ion beam lithography Au contacts on PbTiO_(3)nanorods显示文摘PbTiO_(3)nanorods with tetragonal phase were synthesized by hydrothermal method and heat treatment,and temperature-dependent electrical transport properties of individual PbTiO_(3)nanorod were investigated.The results show that the conductivities of PbTiO_(3)nanorods are gradually enhanced with temperature increasing from 77.4 to 295 K,and exhibit the typical nonlinear Ⅰ–Ⅴ char-acteristics.The barrier height between Au electrode and nanorod is reduced from 0.137 to 0.088 eV with increasing bias from 0.2 to 1 V.The corresponding values of thermal activation energies are 0.172 and 0.06 eV below the conduction band for 180–295 and 77.4–180 K,respectively.This semiconductor-like behavior may result from the larger number of surface defects or localized states in the amorphorized PbTiO_(3). | Jian Wang Bin Chen Heming Deng Xiaojun Zhang Xiaoguang Li Yuancheng Cao Yongming Hu | 2019 | Journal of Advanced Dielectrics2019，9，4： | 0 |
| 20 | A novel conceptual design of a biomimetic oral implant and its biomechanical effect on the repairment of a large mandibular defect显示文摘This study aimed to propose a novel biomimetic design strategy of an oral implant and to numerically examine its biomechanical effect according to clinical interests.The designed implant conceptually mimicked the morphology and elastic modulus of the mandibular bone.Basing on a CT-image-based patient-specific reconstruction of the tumor-excised mandible,the biomechanical effects of the implants with three materials(PEEK/n-HA/CF,PEEK/HA and Ti6Al4V),two surgical conditions(removed and retained muscles),and two postoperative stages(early and late)were fully investigated by a static finite element analysis.Moreover,according to clinical interests(e.g.failure and stability of the implant and rivets),maximum von Mises stresses and strains of the implant and rivets,maximum implant-bone gap in the early postoperative stage,and maximum von Mises stress of the mandible were mainly analyzed.The results showed that the implant composed of Ti6Al4V material was suitable for the current design strategy with respect to the other two PEEK-based materials.Although the implants in the muscle-retained surgical condition had relative greater indices compared to the muscle-removed surgical condition,the index difference between the two conditions was slight.The biomechanical indices indicating the failure and loosening risks of implant and rivets were much reduced in the late postoperative stage with respect to the early postoperative stage due to the osteointegration at the implant-bone interface.Generally,the proposed novel design strategy could be useful to guide the design of the oral implant addressing different implant materials and surgical conditions,and further made proper suggestion to clinicians and patients. | Yongheng Li Yuanbin Hu Heming Chen Xiangfeng Meng Du Chen Hongcheng Gu Qiang Chen Zhongde Mu Zhiyong Li | 2022 | Medicine in Novel Technology and Devices2022，，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员