The stabilization problem of a nonuniform Timoshenko beam system with controllers at the beam's right tip with rotor inertia is studied.
研究了具有线性耗散边界控制的Timoshenko梁的边界反馈镇定问题。
Based on the solution to the deflection of a cantilever beam subjected to tip force and dynamic characteristics of a viaduct with a single-column pier, the influences of element shape, number of integration points and the Hourglass modes to the CPU time and accuracy are studied during collapse analysis.(5) It costs long CPU time to perform simulation with Explicit Time Integration, and some technical methods are studied to improve the analysis efficiency with little loss of accuracy, which include gathering mass, defining of rigid body and contact rationally.
结合推倒分析结果，实现了考虑倒塌的钢筋混凝土桥梁地震反应全过程仿真分析，并将仿真分析结果与其他数值分析方法及实验结果、实际震害进行了比较验证；(3)通过比选现有动力非线性有限元分析软件，采用了商用软件LS-DYNA进行仿真分析，采用CANNY进行弹塑性推倒分析；(4)通过对悬臂梁端部集中力作用下挠度的计算和对一座独柱式桥墩的高架桥动力特性计算，研究了倒塌分析中单元形状选取、单元积分点数、积分算法、是否考虑沙漏等因素对计算速度和精度的影响等几个算法问题；(5)基于显式积分技术的仿真分析的特点是计算量非常大，因此改善计算效率是解决问题的关键。
Introducing the tip-tilt and piston error as the parameter and defining the aperture function of the tiled-grating, far-field property was analyzed with Gaussian beam incidence using the theory of Fourier angular spectrum.
引入角度偏差、位移偏差作为拼接光栅系统的物理参数，定义了拼接光栅的孔径函数，利用傅里叶角谱理论研究了高斯脉冲入射拼接光栅压缩器后的远场分布特性。
In this paper, the history and developmental actuality of focused ion beam and liquid metalion source are introduced firstly. Secondly, emitting theory of liquid metal ion source is introduced. Thirdly, we introduce the design of source parts, the eroding technology of emitting needle, thetechnology of wetted needle well with liquid Ga metal and the design of analysis system of DL-01liquid metal ion source designed by ourselves, heating electrical source and high-voltage source. Then the I-V emitting curve and other performance of the source are measured. The curves showthat the test results conform to the requirement of the design. At the same time, the reasons thatinfluence the performance of the source are analyzed. Finally, the characteristics of the source aresimulated and the conclusion that the characteristics of LMIS intimately related to the shape andsize of the emitter tip is drawn. Thus, the revelation to design the emitting system of LMISeffectively is offered.
本论文首先介绍了聚焦离子束和液态金属离子源的发展历史及现状；其次介绍了液态金属离子源的发射机理；然后对自主开发研制的DL-01型液态金属离子源的源组件结构的设计、发射针尖的腐蚀工艺、挂金属镓工艺、测试系统的设计以及加热电源、离子加速高压电源的设计作了介绍；接下来对该离子源的I-V特性、角电流密度、稳定性以及寿命等性能进行了测试，测试结果表明该源的各项指标均达到了设计要求，并对影响源性能的因素进行了分析；最后对该离子源的发射特性进行了模拟仿真，得出液态金属离子源的发射特性主要由发射针尖顶端的形状和大小决定，而与引出极孔径、发射极和引出极的距离关系不大的结论，从而为合理有效地设计液态金属离子源的发射系统提供了启示。
The invention relates to a tobacco filter tip and relative preparation, wherein it is formed by spinning the lactic acid polymer resin, drawing, coiling and shaping, while the line density is 2-6dtex, the beam density is 3-6ktex, the coil number is 15-30n/25mm.
本发明涉及一种香烟过滤嘴丝束及其制备方法。该香烟过滤嘴丝束，是由乳酸类聚合物树脂经熔体纺丝和后续的牵伸、卷曲和热定型而成，单丝线密度2～6dtex，丝束线密度3～6ktex，卷曲数15～30个/25mm。
Radio energy travels from and to the mainframe through waveguide, a rectangular hollow pipe. RF energy from the transmitter fans out from the waveguide tip and bounces off of the parabolic reflector, focusing into a narrow beam. Echo energy is focused on the waveguide end by the reflector, traveling back down to the radar mainframe.
无线电能量经由一根方形中空的波导管从主机传到桅上的抛物面天线汇聚成狭窄的波束发射出去；天线再将返回的波束汇聚到波导管末端的主机上。
The micro-fabrication processes of photo-lithography were employed to fabricate the piezoelectric cantilevers. Among those, the dry etching methods (ion beam etching and reactive ion beam etching) were used to shape the layers of the cantilevers, and the wet etching was used to form a sharp tip and to remove the buck Si material beneath the cantilever.
用半导体微加工工艺制作了压电微悬臂梁，其中干法刻蚀（离子束刻蚀和活性离子束刻蚀）被用于各层薄膜的形状制作，湿法刻蚀用于形成针尖和除去探针下面的Si体材料以形成悬臂梁。
To investigate the mechanism and parameter influence of the blade tip impact to fuselage for shipboard articulate helicopter, the moderate deflection beam model and the nonlinear quasi-steady aerodynamic model were adopted. Finite rotation was used to simulate the motions of hinges.
为了研究舰面铰接式旋翼桨叶桨尖与机体相碰的原因及参数影响，本文采用中等变形梁模型处理桨叶弹性变形，用有限转角模拟桨叶绕铰刚性运动和非线性准定常气动模型处理气动力。
Calculating Analysis for the Warpage and Stress of Deck Pavement at Tip Position of Assembly Simple Beam Bridge
简支梁桥梁端处桥面连续铺装层结构计算分析
Simulations of the single tip with coaxial focusing electrode are also carried out, and the ef - fects of various geometric and electric parameters on beam focusing are analyzed.
对带有同轴聚焦电极的单个SPINDT微尖也进行了模拟，并且分析了影响电子束聚焦的各种几何和电参数。
This paper discusses the mechanism of the propagation of elastic surface wave, presented a method that use the tip of atomic force microscopy and beam deflexion method to on line detect the nanometer vibration of the particle in the surface wave.
本文探讨了表面弹性波传播的机制，提出了一种利用原子力显微镜微探针与光束偏转法检测纳米振动的新方法，并利用这种方法对表面波质点的纳米振动进行了实时检测。
For a Gaussian beam wave, both the tip-tilt and the phase fluctuation curvature of the propagation path contribute to the amplitude fluctuation, and both the tip-tilt and curvature of the adaptive optics conjugation phase at the transmitter contribute to the general amplitude fluctuation.
对于高斯光束，折射率不均匀媒质相位起伏的倾斜项和曲率项共同对幅度起伏有贡献，发射端的自适应光学共轭相位的倾斜项和曲率项共同作用于总体的幅度起伏。
The utility model relates to prestressed pipe pile, especially a gunite type pile tip for prestressed pipe pile comprising a circle shape end plate and a beam plate distributing in crisscross.
本实用新型属于预应力管桩，特别是涉及一种预应力管桩喷浆式桩尖。
Related to the dynamic failure of structural members struck by projectiles, this paper studies the possibility of the shear failure of a cantilever beam with an attached mass block at the tip under impulsive loading.
以飞射物撞击构件引起破坏为工程背景，研究端头带有质量块的悬臂梁受到冲击载荷作用后发生剪切失效的可能性。
In this paper, a high-speed framing camera is used to seize the transient process of crack propagation. Under impact load, dynamic energy release rates of the running crack tip of a three-point-bend beam with initial crack are studied by means of dynamic caustics.
借助高速摄影捕捉裂纹瞬态扩展过程，利用动态焦散线研究了含有裂纹的三点弯曲梁在冲击载荷作用下扩展裂纹尖端的动态能量释放率分布规律；
It is observed that a travelling plastic segment moves from the tip towards the base in a very short time after impact and, after the largest deformation arose, the beam wiped in the reverse direction.
实验中观察到梁在撞击后程短时间内有塑性区段从端部附近移向根部，梁变形达最大后有明显的反向甩动。
Low energy N + ion beam Implantation on some rice varieties mitotic of root tip cells could promote the mitotic index of Ml generation root tip cells increased.
低能氮离子注入对某些水稻品种根尖细胞的有丝分裂具有促进作用，M1代根尖细胞有丝分裂指数升高。
Then by using the multiplier method, it was proved that the closed loop system was exponentially stable if two boundary feedback controls were applied simultaneously to the beam's tip where the load was carried.
然后利用乘子法证明了，当两个边界反馈控制同时作用于梁的负载端时，闭环系统是指数稳定的。
The relations between the tip deflection of the beam and the thickness (or elastic modulus) of the interlayer are analyzed by the numerical calculation while the external force (or applied voltage) is changed.
通过数值计算分析了外力或电压变化时，复合压电双晶片输出位移与夹层厚度、夹层弹性模量的关系。
According to the application requirements and environment of tip clearance sensor, we have designed a differential optical fiber displacement sensor to measure tip clearance. This sensor adopted single - bundle fiber transmitters for laser beam delivery and double - bundle fibers for collecting the diffusely scattered light.
根据叶尖间隙传感器的使用要求和应用环境，设计了差动式光纤位移传感器进行间隙测量，它采用单光纤传光，两组光纤束接收散射光的结构形式。