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Cross-sectional distortion behaviors of thin-walled rectangular tube in rotary-draw bending process 认领 引用 被引量：14
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作者 赵刚要 刘郁丽 +1 位作者 杨合 卢彩红 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第3期484-489,共6页
The cross-sectional distortion usually appears during rotary-draw bending process of thin-walled rectangular tube with small bending radius.To study the cross-sectional distortion of the tube,a three-dimensional finit... The cross-sectional distortion usually appears during rotary-draw bending process of thin-walled rectangular tube with small bending radius.To study the cross-sectional distortion of the tube,a three-dimensional finite-element model of the process was developed based on ABAQUS/Explicit code and its reliability was validated by experiment.Then,the cross-sectional distortion behaviors of the tube were investigated.The results show that a zone of larger circumferential stress appears on the tube when bending angle reaches 30°.And in the larger circumferential stress zone,the sagging phenomenon is produced obviously.The maximum cross-sectional distortion is located in the larger circumferential stress zone and the angle between the plane of maximum cross-sectional distortion and the bending reference plane is about 50°.The position of the maximum cross-sectional distortion keeps almost unchanged with the variation of the clearances between dies and tube. 展开更多
关键词 thin-walled rectangular tube aluminum alloy 3A21 rotary-draw bending cross-sectional distortion die clearance
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Cross-sectional deformation of H96 brass double-ridged rectangular tube in rotary draw bending process with different yield criteria 认领 引用 被引量：4
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作者 Yangyang XIA Yuli LIU Mengmeng LIU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第6期1788-1798,共11页
Different yield criterion has great difference in predicting the deformation of tube with different material.In order to improve the prediction accuracy of the cross-sectional deformation of the double-ridged rectangu... Different yield criterion has great difference in predicting the deformation of tube with different material.In order to improve the prediction accuracy of the cross-sectional deformation of the double-ridged rectangular tube(DRRT)during rotary draw bending(RDB)process,Mises isotropic yield criterion,Hill’48 and Barlat/Lian anisotropic yield criteria commonly used in practical engineering are introduced to simulate RDB of DRRT.The inverse method combining uniaxial tensile test of whole tube and response surface methodology was proposed to identify the parameters of Hill’48 and Barlat/Lian yield criteria of small-sized H96 brass extrusion DRRT as well.Then based on ABAQUS/Explicit platform,the FE models of RDB process of DRRT considering Mises,Hill’48 and Barlat/Lian yield criteria were built.The results show that:The variation trend of cross-sectional deformation ratio is same when using different yield criteria.The cross-sectional deformation ratio by using Mises yield criterion is close to that by using Hill’48 yield criterion.However,there is a quite difference between by using Barlat/Lian yield criterion and by using Mises or Hill’48 yield criteria.The prediction values of cross-sectional height deformation by using three yield criteria all underestimate the experiment ones,and the prediction values of cross-sectional width deformation overestimate the experiment ones.By comparing the simulation results of cross-sectional deformation of the DRRT with different yield criteria and experiment ones,Barlat/Lian yield criterion is found to be suitable for describing the RDB process of DRRT. 展开更多
关键词 Anisotropy yield criterion Cross-sectional deformation H96 double-ridged rectangular tube H-type rotary draw bending Inverse method
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Cross-sectional deformation behavior of double-ridged rectangular tube with fillers in different stages of H-typed bending 认领 引用 被引量：7
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作者 Chunmei LIU Yuli LIU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第6期1799-1811,共13页
The bent double-ridged rectangular tube(DRRT)with high forming quality is helpful to improve the microwave transmission accuracy.For reducing the cross-sectional deformation in the H-typed bending process,in addition ... The bent double-ridged rectangular tube(DRRT)with high forming quality is helpful to improve the microwave transmission accuracy.For reducing the cross-sectional deformation in the H-typed bending process,in addition to using rigid mandrel to support the inside of tube,ridge groove fillers are also added to restrict the deformation of ridge grooves.Because of the change of stress and strain state of bent tube in bending,rigid mandrel retracting and specially twicespringback stages,and the springback of fillers,the cross-sectional deformation of tube in each stage may be different.Therefore,based on the ABAQUS platform,the finite element models(FEM)for H-typed bending,mandrel retracting and twice-springback stages of H96 DRRT with fillers were established and validated.It is found that,for the height and width deformation of tube and spacing deformation of ridge grooves,retraction of mandrel can make the distribution of these deformations more uniform along the bending direction.The first springback can reduce these deformations significantly,which should be emphasized.But the second springback only increases them by less amount,which can be ignored.The smaller height deformation of ridge groove and filler can be neglected. 展开更多
关键词 Cross-sectional deformation FE simulation H96 double-ridged rectangular tube H-typed rotary draw bending Ridge groove fillers Twice-springback stage
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Saint-Venant torsion analysis of bars with rectangular cross-section and effective coating layers 认领 引用
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作者 H.TEIMOORI R.T.FAAL R.DAS 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2016年第2期237-252,共16页
This paper investigates the torsion analysis of coated bars with a rectangular cross-section. Two opposite faces of a bar are coated by two isotropie layers with different materials of the original substrate that are ... This paper investigates the torsion analysis of coated bars with a rectangular cross-section. Two opposite faces of a bar are coated by two isotropie layers with different materials of the original substrate that are perfectly bonded to the bar. With the Saint- Venant torsion theory, the governing equation of the problem in terms of the warping function is established and solved using the finite Fourier cosine transform. The state of stress on the cross-section, warping of the cross-section, and torsional rigidity of the bar are evaluated. Effects of thickness of the coating layers and material properties on these quantities are investigated. A set of graphs are provided that can be used to determine the coating thicknesses and material properties so as to keep the maximum von Mises stress on the cross-section below an allowable value for effective use of the coating layer. 展开更多
关键词 Saint-Venant torsion rectangular cross-section coating layer torsional rigidity
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PLASTIC POST-BUCKLING OF A SIMPLY SUPPORTED COLUMN WITH A SOLID RECTANGULAR CROSS-SECTION 认领 引用
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作者 程尧舜 卢文达 方红 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1995年第8期713-722,共10页
The plastic post-buckling of a simply supported column with a solid rectangularcross-section is analysed by a new approach. High order terms in the asymptotic post-buckling expansions are carried out. In some aspects,... The plastic post-buckling of a simply supported column with a solid rectangularcross-section is analysed by a new approach. High order terms in the asymptotic post-buckling expansions are carried out. In some aspects, the method proposed in thispaper is similar io Hutchinson's. However, the computation is simple since theintroduction is avoided of stretched coordinates. The method can be used to analyseinitial post-bifurcation of plates and shells in the plastic range. 展开更多
关键词 plastic post-buckling perturbation columns of rectangular cross-section
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Overview of the Rectangular Wire Windings AC Electrical Machine 认领 引用 被引量：10
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作者 Yu Zhao Dawei Li +1 位作者 Tonghao Pei Ronghai Qu 《CES Transactions on Electrical Machines and Systems》 CSCD 2019年第2期160-169,共10页
The rectangular wire winding AC electrical machine has drawn extensive attention due to their high slot fill factor,good heat dissipation,strong rigidity and short end-windings,which can be potential candidates for so... The rectangular wire winding AC electrical machine has drawn extensive attention due to their high slot fill factor,good heat dissipation,strong rigidity and short end-windings,which can be potential candidates for some traction application so as to enhance torque density,improve efficiency,decrease vibration and weaken noise,etc.In this paper,based on the complex process craft and the electromagnetic performance,a comprehensive and systematical overview on the rectangular wire windings AC electrical machine is introduced.According to the process craft,the different type of the rectangular wire windings,the different inserting direction of the rectangular wire windings and the insulation structure have been compared and analyzed.Furthermore,the detailed rectangular wire windings connection is researched and the general design guideline has been concluded.Especially,the performance of rectangular wire windings AC machine has been presented,with emphasis on the measure of improving the bigger AC copper losses at the high speed condition due to the distinguished proximity and skin effects.Finally,the future trend of the rectangular wire windings AC electrical machine is prospected. 展开更多
关键词 AC copper losses the rectangular wire winding AC electrical machine process craft winding connection.
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Measurement and Correlation of Pressure Drop for Gas-Liquid Two-phase Flow in Rectangular Microchannels 认领 引用 被引量：16
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作者 MA Youguang JI Xiyan +2 位作者 WANG Dongji FU Taotao ZHU Chunying 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2010年第6期940-947,共8页
The pressure drop of gas-liquid two-phase flow in microchannel is of fundamental importance in heat and mass transfer processes.In this work,the pressure drop of gas-liquid two-phase flow in horizontal rectangular cro... The pressure drop of gas-liquid two-phase flow in microchannel is of fundamental importance in heat and mass transfer processes.In this work,the pressure drop of gas-liquid two-phase flow in horizontal rectangular cross-section microchannels was measured by a pressure differential transducer system.Water,ethanol and n-propanol were used as liquid phase to study the effects of capillary number on pressure drop;air was used as the gas phase.Four microchannels with various dimensions of 100μm×200μm,100μm×400μm,100μm×800μm and 100μm×2000μm(depth×width)were used for determining the influence of configuration on the pressure drop.Experimental results showed that in micro-scale,the capillary number also affected the pressure drop remarkably,and in spite of only one-fold difference in aspect ratio,the variation of pressure drop reached up to near three times under the same experimental conditions.Taking the effects of aspect ratio and surface tension into account,a modi-fied correlation for Chisholm parameter C in the Chisholm model was proposed for predicting the frictional multi-plier,and the predicted values by the proposed correlation showed a satisfactory agreement with experimental data. 展开更多
关键词 pressure drop rectangular cross-section microchannel surface tension configuration influence Chis-holm parameter C
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An exact analytical solution for convective heat transfer in rectangular ducts 认领 引用 被引量：3
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作者 Mohammad Mohsen SHAHMARDAN Mahmood NOROUZI +1 位作者 Mohammad Hassan KAYHANI Amin AMIRI DELOUEI 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2012年第10期768-781,共14页
An exact analytical solution is obtained for convective heat transfer in straight ducts with rectangular cross-sections for the first time.This solution is valid for both H1 and H2 boundary conditions,which are relate... An exact analytical solution is obtained for convective heat transfer in straight ducts with rectangular cross-sections for the first time.This solution is valid for both H1 and H2 boundary conditions,which are related to fully developed convective heat transfer under constant heat flux at the duct walls.The separation of variables method and various other mathematical techniques are used to find the closed form of the temperature distribution.The local and mean Nusselt numbers are also obtained as functions of the aspect ratio.A new physical constraint is presented to solve the Neumann problem in non-dimensional analysis for the H2 boundary conditions.This is one of the major innovations of the current study.The analytical results indicate a singularity occurs at a critical aspect ratio of 2.4912 when calculating the local and mean Nusselt numbers. 展开更多
关键词 Exact analytical solution Convective heat transfer Straight duct Rectangular cross-section Constant heat flux
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Binding Energy and Photoionization of Hydrogenic Impurities in GaAs/Ga1-xAl_xAs Quantum Well Wires 认领 引用 被引量：3
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作者 刘建军 苏会 +1 位作者 关荣华 杨国琛 《Journal of Semiconductors》 CAS 北大核心 2003年第6期561-566,共6页
The binding energy and the photon energy dependence of the photoionization cross-section are calculated for a hydrogenic impurity in GaAs/Ga 1-xAl xAs quantum well wires.The correlation between confined and non-confin... The binding energy and the photon energy dependence of the photoionization cross-section are calculated for a hydrogenic impurity in GaAs/Ga 1-xAl xAs quantum well wires.The correlation between confined and non-confined direction of the wire in the variational wave function is taken into account.The results show that the photoionization cross-sections are affected by the width of the wire and that their magnitudes are larger than those in infinite potential quantum well wires.In comparison with previous's results,the variational wave function improves the binding energy and decreases the value of photoionization cross-sections of the hydrogenic impurities,which makes the results more reasonable. 展开更多
关键词 photoionization cross-section binding energy hydrogenic impurity quantum well wire
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Interface-Optical-Phonon Modes in Quasi-one-dimensional Wurtzite Rectangular Quantum Wires 认领 引用 被引量：1
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作者 ZHANG Li 《Communications in Theoretical Physics》 SCIE CAS 2006年第6X期1109-1112,共4页
By employing the dielectric continuum model and Loudon＇s uniaxial crystal model, the interface optical （IO） phonon modes in a freestanding quasi-one-dimensional （Q1D） wurtzite rectangular quantum wire are derived... By employing the dielectric continuum model and Loudon＇s uniaxial crystal model, the interface optical （IO） phonon modes in a freestanding quasi-one-dimensional （Q1D） wurtzite rectangular quantum wire are derived and analyzed. Numerical calculation on a freestanding wurtzite GaN quantum wire is performed. The resulte reveal that the dispersion frequencies of IO modes sensitively depend on the geometric structures of the Q1D wurtzite rectangular quantum wires, the free wave-number kz in z-direction and the dielectric constant of the nonpolar matrix. The degenerating behavior of the IO modes in Q1D wurtzite rectangular quantum wire has been clearly observed in the case of small wave-number kz and Iarge ratio of length to width of the rectangular crossing profile. The limited frequency behaviors of IO modes have been analyzed deeply, and detailed comparisons with those in wurtzite planar quantum wells and cylindrical quantum wires are also done. The present theories can be looked on as a generalization of that in isotropic rectangular quantum wires, and it can naturally reduce to the case of Q1D isotropic quantum wires once the anisotropy of the wurtzite material is ignored. 展开更多
关键词 interface phonon modes polarization eigenvectors rectangular quantum wire
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SiC DC/DC变换器电磁辐射干扰预测方法 认领 引用
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作者 羊岳彬 《电工技术》 2025年第21期69-73,共5页
碳化硅(SiC)开关器件在DC/DC变换器中会产生强烈的电磁辐射干扰,为优化换流器内部结构,实现更高的功率密度,提出一种SiC DC/DC变换器电磁辐射干扰的预测方法。该方法将变流器内部导线分为竖直导体和平面矩形导线,建立两种导电体在空间... 碳化硅(SiC)开关器件在DC/DC变换器中会产生强烈的电磁辐射干扰,为优化换流器内部结构,实现更高的功率密度,提出一种SiC DC/DC变换器电磁辐射干扰的预测方法。该方法将变流器内部导线分为竖直导体和平面矩形导线,建立两种导电体在空间中引起的电磁辐射干扰数学模型。以SiC开关器件的SPICE模型为基础建立了DC/DC变换器电路级仿真,求得变换器中各支路电流频谱作为电磁辐射干扰模型的激励源。最后,通过Maxwell软件进行三维有限元仿真,仿真结果与所建模型结果基本吻合,证明了提出方法的正确性。 展开更多
关键词 碳化硅 电磁辐射干扰 SPICE模型 竖直导体模型 矩形导线模型
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矩形截面导线绕制的干式空心电抗器优化设计方法 认领 引用 被引量：8
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作者 陈锋 巴灿 +1 位作者 徐玉东 马西奎 《电工技术学报》 EI CSCD 北大核心 2019年第24期5115-5125,共11页
根据矩形截面导线绕制的干式空心电抗器结构特点,该文建立以层等电阻电压,包封等温升和包封等高为约束条件的电抗器优化模型,针对该模型提出等式约束规划问题降维算法,将有等式约束优化问题转换成降维的无等式约束优化问题,使得优化设... 根据矩形截面导线绕制的干式空心电抗器结构特点,该文建立以层等电阻电压,包封等温升和包封等高为约束条件的电抗器优化模型,针对该模型提出等式约束规划问题降维算法,将有等式约束优化问题转换成降维的无等式约束优化问题,使得优化设计变量由原来的2m+n+2个减少到5个。此外,综合分析电抗器原材料成本最小化和运行成本最小化这两个相互冲突的目标函数,提出干式空心电抗器多目标Pareto最优算法。结果表明,优化设计的矩形截面导线绕制电抗器具有结构紧凑、无环流、损耗小及散热效率高等优点。 展开更多
关键词 干式空心电抗器 优化设计 降维算法 矩形截面导线
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A new absolute nodal coordinate formulation beam element with multilayer circular cross section 认领 引用 被引量：8
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作者 Peng Lan Qinglong Tian Zuqing Yu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2020年第1期82-96,共15页
A systematic numerical integration method is applied to the absolute nodal coordinate formulation(ANCF)fully parameterized beam element with smooth varying and continuous cross section.Moreover,the formulation for the... A systematic numerical integration method is applied to the absolute nodal coordinate formulation(ANCF)fully parameterized beam element with smooth varying and continuous cross section.Moreover,the formulation for the integration points and weight coefficients are given in the method which is used to model the multilayer beam with a circular cross section.To negate the effect of the bending stiffness for the element used to model the high-voltage electrical wire,the general continuum mechanical approach is adjusted.Additionally,the insulation cover for some particular types of the wire is described by the nearly incompressible Mooney-Rivlin material model.Finally,a static problem is presented to prove the accuracy and convergence properties of the element,and a dynamic problem of a flexible pendulum is simulated whereby the balance of the energy can be ensured.An experiment is carried out in which a wire is released as a pendulum and falls on a steel rod.The configurations of the wire are captured by a high-speed camera and compared with the simulation results.The feasibility of the wire model can therefore be demonstrated. 展开更多
关键词 Circular cross-section beam Absolute nodal coordinate formulation Electrical wire modeling Contact
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软岩巷道锚网喷支护技术研究 认领 引用 被引量：9
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作者 杨锡祥 韩悦 +3 位作者 刘宁 周发陆 王少勇 张小刚 《矿业研究与开发》 CAS 北大核心 2018年第6期11-15,共5页
为解决T型钢拱架+圆木杆支护返修率高、维护费用高、影响正常生产运输等问题,进行了锚网喷新型支护工艺的现场探索试验。在16中段试验段取两个断面、邻近原支护段取一个断面,分别在巷道顶板和两帮安装焊接测钩的管缝锚杆,用收敛计每3d... 为解决T型钢拱架+圆木杆支护返修率高、维护费用高、影响正常生产运输等问题,进行了锚网喷新型支护工艺的现场探索试验。在16中段试验段取两个断面、邻近原支护段取一个断面,分别在巷道顶板和两帮安装焊接测钩的管缝锚杆,用收敛计每3d测量各测点距离,求巷道收敛变形量。经过1个月的变形监测,锚网喷新支护方案断面1各测点收敛变形量比原支护方案分别减小2.476,9.880和8.370cm;断面2分别减小3.637,12.770和12.179cm。试验结果表明:锚网喷新型支护方式能够明显降低巷道收敛变形,达到良好的支护效果,对改进现有支护方式、降低维护费用具有重要的现实意义。 展开更多
关键词 软岩 锚网喷支护 矩形巷道 收敛变形监测
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无线充电系统实际Litz线绕平面线圈高频电阻分析与计算 认领 引用 被引量：5
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作者 薄强 王丽芳 +2 位作者 张玉旺 郭彦杰 张云 《电工电能新技术》 CSCD 北大核心 2022年第4期1-8,共8页
线圈高频电阻的计算对无线充电系统线圈的优化设计至关重要。实际工程一般采用Litz线来绕制线圈以减小趋肤和邻近损耗,但由于扭绞工艺的影响,实际Litz线的电阻值介于理想Litz线和平行束导线之间。本文首先详细分析Litz线电阻的组成与影... 线圈高频电阻的计算对无线充电系统线圈的优化设计至关重要。实际工程一般采用Litz线来绕制线圈以减小趋肤和邻近损耗,但由于扭绞工艺的影响,实际Litz线的电阻值介于理想Litz线和平行束导线之间。本文首先详细分析Litz线电阻的组成与影响因素;其次,提出采用理想Litz线和平行束导线的电阻来拟合实际Litz线电阻的计算方法,该方法同时考虑了线圈自身结构和不同线圈之间电磁场的相互耦合作用对电阻的影响;最后,采用两类Litz线搭建平面矩形线圈和DD线圈进行实验验证。实验表明,在不同的频率范围内,所提计算方法得出的平面矩形线圈和DD线圈的电阻值与实际测量结果一致,验证了该计算方法的准确性和有效性。 展开更多
关键词 无线充电系统 Litz线 平面矩形线圈 DD线圈 高频电阻 电磁耦合
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矩形钢丝成形有限元模拟及工艺参数优化 认领 引用 被引量：3
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作者 武大鹏 陈文琳 +1 位作者 张文超 程颖 《金属制品》 CAS 2010年第1期36-41,共6页
矩形钢丝截面由直边与圆角组成,模拉时直边与圆角处的磨损不均匀,模具寿命很低。提出组合法矩形钢丝成形工艺,建立组合法矩形钢丝成形过程的有限元模型,采用古布金公式验证有限元模型的正确性。利用正交试验法对工作锥角、定径带长度、... 矩形钢丝截面由直边与圆角组成,模拉时直边与圆角处的磨损不均匀,模具寿命很低。提出组合法矩形钢丝成形工艺,建立组合法矩形钢丝成形过程的有限元模型,采用古布金公式验证有限元模型的正确性。利用正交试验法对工作锥角、定径带长度、圆角半径、摩擦因数和拉拔速度等工艺参数进行优化,得到直径4.2 mm的Q195钢丝,用组合法拉拔成截面为2.3 mm×4.8 mm的矩形钢丝最优工艺参数组合:工作锥角为14,°定径带长度为3.2 mm,圆角半径为0.7 mm,摩擦因数为0.12,拉拔速度为1.2 m/s。 展开更多
关键词 矩形钢丝 有限元模拟 正交试验 工艺参数
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铜扁线连续挤压生产实践 认领 引用 被引量：3
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作者 赵大军 陈明坤 魏鑫 《铜业工程》 CAS 2012年第3期1-4,共4页
连续挤压技术是一种新型高效加工技术,由于工艺流程短、生产成本低、制品性能优越而在铜加工领域得到日益广泛的应用。中铝昆明铜业有限公司引进的TLJ系列连续挤压铜扁线生产线已成功开发出不同规格的高精度、高质量铜扁线产品。生产实... 连续挤压技术是一种新型高效加工技术,由于工艺流程短、生产成本低、制品性能优越而在铜加工领域得到日益广泛的应用。中铝昆明铜业有限公司引进的TLJ系列连续挤压铜扁线生产线已成功开发出不同规格的高精度、高质量铜扁线产品。生产实践表明,合理的生产工艺是铜扁线连续挤压顺行的关键;表面气泡、夹杂、充不满等缺陷是影响铜扁线质量的常见问题;通过挤压间隙的合理控制、选择合理的挤压速度和选用合理的扩展比等手段,可有效控制制品缺陷,提高连续挤压铜扁线的成材率。 展开更多
关键词 铜扁线 连续挤压 短流程 缺陷 工艺
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三元混晶矩形量子阱线的表面和界面光学声子模 认领 引用 被引量：1
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作者 包锦 闫祖威 《内蒙古大学学报（自然科学版）》 CAS 北大核心 2020年第3期244-252,共9页
运用改进的无规元素等位移模型和玻恩-黄近似,结合介电连续模型,研究了含三元混晶的矩形量子阱线的表面和界面光学声子模。以GaAs/AlxGa1-xAs和ZnxCd1-xSe/ZnSe为例,获得了表面和界面光学声子模的色散关系以及表面和界面光学声子模的频... 运用改进的无规元素等位移模型和玻恩-黄近似,结合介电连续模型,研究了含三元混晶的矩形量子阱线的表面和界面光学声子模。以GaAs/AlxGa1-xAs和ZnxCd1-xSe/ZnSe为例,获得了表面和界面光学声子模的色散关系以及表面和界面光学声子模的频率随混晶组分和量子阱线结构的变化关系。结果表明:与二元晶体量子阱线和三元混晶单量子线不同,在GaAs/AlxGa1-xAs和ZnxCd1-xSe/ZnSe量子阱线中分别存在十支和八支表面和界面光学声子模,这些表面和界面光学声子模的频率曲线分别位于二元晶体和三元混晶的体纵、横光学声子之间的频率区间内,且其能量随混晶组分和量子阱线结构的变化呈非线性变化,三元混晶的"单模"和"双模"性也在色散曲线中体现了出来。 展开更多
关键词 表面和界面光学声子模 三元混晶 矩形量子阱线
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磁场下InAs/InP应变矩形量子线能级结构 认领 引用 被引量：1
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作者 王广新 段秀芝 +1 位作者 钟寿仙 张鹏 《内蒙古师范大学学报（自然科学汉文版）》 2010年第4期367-371,共5页
利用微扰理论在有效质量近似下研究了磁场下截面长度固定的矩形量子线中电子和空穴的基态、第一激发态能量,在计算过程中考虑了形成量子线的两种材料的晶格常数不同带来的形变势、电子和空穴在材料中的质量失配以及空穴有效质量的各向... 利用微扰理论在有效质量近似下研究了磁场下截面长度固定的矩形量子线中电子和空穴的基态、第一激发态能量,在计算过程中考虑了形成量子线的两种材料的晶格常数不同带来的形变势、电子和空穴在材料中的质量失配以及空穴有效质量的各向异性等因素.结果表明:当磁场增大时,不同尺寸量子线中电子基态能量的差值增大的速度明显减小,而空穴的相应情况不明显;不同尺寸量子线中粒子的第一激发态能量差值随着磁场的增大而增大,并且差值较小. 展开更多
关键词 矩形量子线 磁场 电子 空穴 能级结构
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磁场下InAs/InP矩形量子线中的电子结构 认领 引用
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作者 段秀芝 王广新 +1 位作者 刘德 苟秉屏 《河北师范大学学报（自然科学版）》 CAS 北大核心 2009年第6期749-754,共6页
在有效质量近似下,利用微扰理论研究了矩形量子线中电子和空穴的基态能量.考虑形成量子线的2种材料晶格常数不同带来的形变势、电子和空穴在材料中的质量失配以及空穴有效质量的各向异性等因素,在矩形长度不变时,计算了电子和空穴的基... 在有效质量近似下,利用微扰理论研究了矩形量子线中电子和空穴的基态能量.考虑形成量子线的2种材料晶格常数不同带来的形变势、电子和空穴在材料中的质量失配以及空穴有效质量的各向异性等因素,在矩形长度不变时,计算了电子和空穴的基态能量随磁场以及矩形宽度的变化情况.结果表明,粒子的基态能量随着磁场的增大而增大,随着矩形宽度的增大而减小;磁场增大时,不同尺寸量子线中电子的基态能量随磁场的变化曲线间距减小的趋势比空穴明显得多;在较高磁场下,电子的基态能量随量子线尺寸增大下降的趋势比低磁场时明显,而空穴的这种特征不明显. 展开更多
关键词 矩形量子线 磁场 电子 空穴 基态能量
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