|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Lagrange系统的形式不变性(英文)显示文摘研究Lagrange系统的形式不变性 .用Lagrange方程在无限小变换下的形式不变性 ,给出形式不变性的定义和判据 .建立形式不变性与Noether对称性之间的关系 . | 梅凤翔 | 2000 | Journal of Beijing Institute of Technology2000，9，2： | 56 |
| 2 | 在布鲁日欧洲学院的演讲——中华人民共和国主席 习近平 2014年4月1日 布鲁日显示文摘尊敬的菲利普国王夫妇,尊敬的范龙佩主席,尊敬的迪吕波首相,尊敬的德维戈主席、莫纳尔院长,尊敬的各位使节,老师们,同学们,女士们,先生们,朋友们:大家好!很高兴来到欧洲学院同大家见面。首先,我向学院的老师们、同学们,向各位关心和支持中国发展的欧洲朋友们,致以诚挚的问候和良好的祝愿! | 习近平 | 2014 | Beijing Review2014，57，17： | 32 |
| 3 | 在德国科尔伯基金会的演讲显示文摘尊敬的魏茨洋克前总统,尊敬的施密特前总理,尊敬的施迈尔副主席,女士们,先生们,朋友们:古腾塔克!大家好!我很高兴应魏茨泽克前总统和科尔伯基金会的邀请,与大家见面。首先,我谨对科尔伯基金会在促进中欧相互了解和理解方面作出的努力和贡献,表示诚挚的谢意! | 习近平 | 2014 | Beijing Review2014，57，27： | 34 |
| 4 | Effects of low temperature on properties of structural steels显示文摘The experiments were carried out to measure the mechanical properties of three grades of structural steels (Q235A, 16Mn and Q390E steel ) at low temperature. It was shown that the strength of the steels increases while the plasticity and toughness decrease as temperature drops. In the transitional area the toughness drops rapidly with temperature. Among the three structural steels,Q390E steel has the best toughness and the lowest sensitivity. | YanminWu YuanqingWang YongjiuShi JianjingJiang | 2004 | Journal of University of Science and Technology Beijing2004，11，5： | 29 |
| 5 | Stability of Ultra-fine Microstructures during Tempering显示文摘The stability of ultra-fine microstructure during tempering at 650℃ was investigated on a Nb-containing steel. The steel had undergone 5 passes controlled rolling, then was relaxed (air cooled) to 730 ℃ and cooled in water The evolution of microstructure was that, in early stage of tempering, no obvious change was detected by means of optical microscopy while dislocation cells were formed inside bainitic laths. With further tempering, bainitic laths started to coalesce in some regions. Finally, polygonal ferrite was formed while hardness decreased dramatically. Some samples taken from the same primary plate were reheated at 930 ℃for 0.5 h followed by quenching into water before tempering. Despite their lower original hardness, the reheated samples softened faster during tempering. Ferrite was quickly formed in the reheated samples. These results indicate that the evolution of microstructures towards equilibrium during tempering of the steel is mainly determined by whether dislocations are pinned rather than the dislocation density. | Shanwu Yang, Chengjia Shang,Xinlai He, Xuemin Wang, Yi Yuan (Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) | 2001 | Journal of University of Science and Technology Beijing2001，8，2： | 25 |
| 6 | Relaxation of Deformed Austenite and Refinement of Bainite in a Nb-Containing Microalloyed Steel显示文摘By means of stress relaxation and strain-induced precipitation in deformed austenite, bainite with micron sheaves size was ob-tained in Nb-containing steel. Microstructures of deformed samples isothermally relaxed for various time followed by cooling in water were examined. Stress relaxation test and transmission electron microscopy (TEM) were employed to detect precipitation of microalloy elements, such as Nb, Ti, during isothermal holding after deformation. All the samples were constituted by lath-like bainite along with acicular ferrite, but the size of bainitic sheaves and the amount of acicular ferrite were changed with relaxation time. To achieve optimum refinement, relaxation should be confined in the stage when the precipitates have sufficiently grown and started to coarsen. The sample having not undergone relaxation does not exhibit obvious refinement despite of its higher dislocation density. These results indicate that relaxation promotes bainite to refine, which is because deformed austenitic grains are divided by dislocation walls formed during rela-xation and acicular ferrite formed before bainitic transformation. | Shanwu Yang, Xuemin Wang, Chengjia Shang, Xinlai He, Yi Yuan Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China | 2001 | Journal of University of Science and Technology Beijing2001，8，3： | 24 |
| 7 | Method of Improving the Navigation Accuracy of SINS by Continuous Rotation显示文摘A method of improving the navigation accuracy of strapdown inertial navigation system (SINS) is studied. The particular technique discussed involves the continuous rotation of gyros and accelerometers cluster about the vertical axis of the vehicle. Then the errors of these sensors will have periodic variation corresponding to components along the body frame. Under this condition, the modulated sensor errors produce reduced system errors. Theoretical analysis based on a new coordinate system defined as sensing frame and test results are presented, and they indicate the method attenuates the navigation errors brought by the gyros’ random constant drift and the accelerometer’s bias and their white noise compared to the conventional method. | 杨勇 缪玲娟 沈军 | 2005 | Journal of Beijing Institute of Technology2005，14，1： | 22 |
| 8 | 积极树立亚洲安全观 共创安全合作新局面:在亚洲相互协作与信任措施会议第四次峰会上的讲话显示文摘2014年5月21日 上海 各位来宾,各位同事,女士们,先生们,朋友们:感谢土耳其总统特别代表达乌特奥卢外长刚才的发言。值此中方担任亚信主席国之际,我谨对各方特别是亚信倡议国哈萨克斯坦和前任主席国土耳其给予中方的信任和支持,表示衷心的感谢!现在,我代表中华人民共和国发言。 | 习近平 | 2014 | Beijing Review2014，57，26： | 22 |
| 9 | 共建“一带一路”倡议:进展、贡献与展望(下)显示文摘(四)绿色之路共建“一带一路”倡议践行绿色发展理念,倡导绿色、低碳、循环、可持续的生产生活方式,致力于加强生态环保合作,防范生态环境风险,增进沿线各国政府、企业和公众的绿色共识及相互理解与支持,共同实现2030年可持续发展目标。 | 推进“一带一路”建设工作领导小组办公室 | 2019 | Beijing Review2019，62，20： | 23 |
| 10 | 在华盛顿州当地政府和美国友好团体联合欢迎宴会上的演讲显示文摘尊敬的基辛格博士,尊敬的英斯利州长、普利茨克部长、默里市长,尊敬的希尔斯主席、菲尔茨主席,女士们,先生们,朋友们:人家好!谢谢基辛格博士的介绍。基辛格博士总能说出一些新颖的观点,他的介绍让我对自己也有了一个新的认识角度。 | 习近平 | 2015 | Beijing Review2015，58，41： | 21 |
| 11 | A Special TMCP Used to Develop a 800MPa Grade HSLA Steel显示文摘The effect of relaxation after finished rolling on structures and properties of four microalloyed steel with different content of Nb and Ti was investigated. By alloy designing and control rolling + relaxation-precipitation-control phase transformation (RPC) process, a new 800 MPa grade HSLA plate steel could be obtained, the microstructure is composite ultra- fine lath bainite/martensite. The tempering process and mechanical properties of this kind of HSLA steel were investigated. The yield strength can achieve 800 MPa, and the ductility and impact toughness is satisfied. | Chengjia Shang,Xuemin Wang, Xinlai He, Shanwu Yang, Yi Yuan Material Science and Engineering School, University of Science and Technology Beijing, Beijing, 100083, China | 2001 | Journal of University of Science and Technology Beijing2001，8，3： | 20 |
| 12 | Multi-constrained model predictive control for autonomous ground vehicle trajectory tracking显示文摘A multi-constrained model predictive control(MPC)algorithm for trajectory tracking of an autonomous ground vehicle is proposed and tested in this paper.First,to simplify the computation,an active steering linear error model is applied in the MPC controller.Then,a control increment constraint and a relaxing factor are taken into account in the objective function to ensure the smoothness of the trajectory,using a softening constraints technique.In addition,the controller can obtain optimal control sequences which satisfy both the actual kinematic constraints and the actuator constraints.The circular trajectory tracking performance of the proposed method is compared with that of another MPC controller.To verify the trajectory tracking capabilities of the designed controller at different desired speed,the simulation experiments are carried out at the speed of 3m/s,5m/s and 10m/s.The results demonstrate the MPC controller has a good speed adaptability. | 龚建伟 徐威 姜岩 刘凯 郭红芬 孙银健 | 2015 | Journal of Beijing Institute of Technology2015，24，4： | 19 |
| 13 | Orthogonal analysis of water model study on the optimization of flow control devices in a six-strand tundish显示文摘Improper flow control devices in a multi-strand tundish can cause some problems, for example, liquid steel cannot reach every nozzle at the same time and the liquid steel in nozzles far away from the entry zone has a lower temperature. The water model experiment of a six-strand tundish of Tianjin Iron & Steel Co. Ltd. was performed, a new 'U' type baffle was obtained, and its parameters were defined by perpendicular analysis. The 'U' baffle can not only improve those imperfections, but also prolong the residence time of nonmetallic inclusions, which is good for their flotation and separation. | Zhengyan Wei Yanping Bao Jianhua Liu Wenxu Gong Baoming Wang | 2007 | Journal of University of Science and Technology Beijing2007，14，2： | 18 |
| 14 | 深化合作伙伴关系共建亚洲美好家园-在新加坡国立大学的演讲显示文摘尊敬的李显龙总理,
尊敬的张志贤副总理,
尊敬的陈祝全校长,
尊敬的王庚武所长,
老师们,同学们,女士们,先生们:
大家好!很高兴来到新加坡国立大学,并利用“新加坡讲座”这个平台,同各位同学和各界朋友见面。今年是中新建交25周年,我很荣幸应陈庆炎总统邀请,对有着“花园国家”美誉的新加坡进行国事访问。 | 习近平 | 2015 | Beijing Review2015，58，48： | 18 |
| 15 | 车辆运动状态下SINS的初始对准技术(英文)显示文摘对车辆运动状态下捷联惯导系统的初始对准技术进行研究 .以里程计作为外部传感器 ,建立了运动状态下初始对准的数学模型 ,分析了系统状态的可观测性 ,并进行了仿真研究 .结果表明 ,捷联惯导系统只要求短时间内(几秒钟 )车辆处于静止状态 ,以进行解析式粗对准 ,之后车辆就可以向预定地点行驶 ,1 0min内即可在运动状态下完成精对准 。 | 缪玲娟 沈军 刘伟 杨勇 | 2002 | Journal of Beijing Institute of Technology2002，11，3： | 17 |
| 16 | Effects of gradient structure on the microstructures and properties of coated cemented carbides显示文摘The effects of gradient structure on the microstructure and properties of coated cemented carbides were researched with optical microscopy (OM), scanning electron microscopy (SEM), strength measurements, and cutting tests. It shows that vacuum sintering of WC-Ti(C, N)-TaC-Co cemented carbides results in the formation of a surface ductile zone. The ductile zone prevents crack propagation and leads to the increase of transverse rupture strength of the substrate. The impact resistance of coated gradient inserts was obviously improved on the basis of maintaining resistance to abrasion and the forming mechanism of the gradient structure was also analyzed. | Li Chen Enxi Wu Fei Yin Jia Li | 2006 | Journal of University of Science and Technology Beijing2006，13，4： | 17 |
| 17 | Dynamic analysis of fault rockburst based on gradient-dependent plasticity and energy criterion显示文摘Fault rockburst is treated as a strain localization problem under dynamic loading condition considering strain gradient and strain rate. As a kind of dynamic fracture phenomena, rockburst has characteristics of strain localization, which is considered as a one-dimensional shear problem subjected to normal compressive stress and tangential shear stress. The constitutive relation of rock material is bilinear (elastic and strain softening) and sensitive to shear strain rate. The solutions proposed based on gradientdependent plasticity show that intense plastic strain is concentrated in fault band and the thickness of the band depends on the characteristic length of rock material. The post-peak stiffness of the fault band was determined according to the constitutive parameters of rock material and shear strain rate. Fault band undergoing strain softening and elastic rock mass outside the band constitute a system and the instability criterion of the system was proposed based on energy theory. The criterion depends on the constitutive relation of rock material, the structural size and the strain rate. The static result regardless of the strain rate is the special case of the present analytical solution. High strain rate can lead to instability of the system. | XuebinWang XiaobinYang ZhihuiZhang YishanPan | 2004 | Journal of University of Science and Technology Beijing2004，11，1： | 17 |
| 18 | Digital Image Scrambling Technology Based on the Symmetry of Arnold Transform显示文摘An improved digital image scrambling method based on Arnold transform is proposed. The method can be used for the rectangle image by splitting rectangle image into several square images. Furthermore,a pretreatment is added to speeding up the process and enhancing the scrambling effect. The recovering of the scrambled image depends on the reverse Arnold transform that has the same cycle times with the Arnold transform. The recovering is lossless and need not calculating the period of the Arnold transform. Finally, experimental results show the robustness of the method. | 杨雅丽 蔡娜 倪国强 | 2006 | Journal of Beijing Institute of Technology2006，15，2： | 16 |
| 19 | 光纤陀螺漂移的数据分析及建模(英文)显示文摘设计了应用于陆用捷联惯导系统中的干涉式光纤陀螺 (IFOG)的数据采集系统 ,对IFOG进行了测试 ,给出了测试曲线 .采用Allan方差法对IFOG的测试数据进行了分析 ,辨识出了各项随机误差系数 .此外 ,采用时间序列分析方法 ,建立了IFOG的随机漂移误差模型 .所得结论为改进IFOG设计及实际应用中对IFOG的误差补偿奠定了基础 . | 缪玲娟 张方生 沈军 刘伟 | 2002 | Journal of Beijing Institute of Technology2002，11，1： | 16 |
| 20 | 捷联惯导误差分析与误差补偿(英文)显示文摘通过误差分析 ,讨论了各种误差源对捷联惯导系统的影响 .根据惯导系统精度要求 ,确定了惯性测量元件最大允许误差 ,从而为选择合理的传感器确定了理论依据 .这些传感器组成的惯性测量元件需要经过标定实验来确定系统误差补偿模型中的系数 .误差补偿后 ,通过均匀设计法得到系统精度 ,满足了精度要求 . | 刘勤 刘莉 祁载康 | 2002 | Journal of Beijing Institute of Technology2002，11，2： | 16 |
您所在的机构暂未开通此部分的功能，请联系管理员