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To analyze the pseudo phenomena caused by migration velocity error, the paper firstly studied the depth error between post-stack migration and prestack migration caused by same velocity error, and found the depth error was only relative to velocity error and had no direct matter with methods of depth migration (post-stack migration or prestack migration). Then the paper did numerical simulation of a complex lenticular body model with wave-equation modeling and migration, and found that the velocity error could not only induce depth error, but also could change the modality of construction and the event of subjacent layers. Furthermore, it could change the frequency of reflective event. They are the pseudo phenomena caused by migration.

从分析偏移速度误差带来的各种假象出发,本文首先对比分析了速度误差对叠后深度偏移和叠前深度偏移的影响,发现偏移剖面的深度误差仅与速度模型的误差有关系,与具体的偏移方法没有直接的关系;然后对一个复杂的透镜体模型进行了波动方程叠后正演和偏移计算,详细地讨论了不同的速度误差带来的各种假象,发现速度误差不仅会带来深度误差,而且会造成构造体的形态变化,下覆地层同向轴的扭曲,还可能引起地层同向轴的频率发生变化,给资料解释带来一定的假象。

Rewinding: The process of winding the film from the take-up reel to the supply reel so that the head end, or start of the reel, is on the outside.

倒片:把胶片从卷片轴倒到放片轴上,使胶片前面或者说卷轴的开始部分在外圈。

At first in the preliminary design this paper computes the linear damping coefficient of the viscous damper employed in this project using Composite Response Spectra approach, meantime, this paper proves that reducing the exponent of velocity of the piston can increase the magnitude of the dissipative energy, because of the viscous damper employed in the practical project character nonlinear behavior; next this chapter performs analysis and comparison between the building without and with the viscous dampers aforementioned when the building suffers from various Time Domain Response, from the angle of displacement, interstroy drift, velocity, interstory velocity, acceleration, energy, maximum axial force of the dampers and of the column etc., in order to prove that the incorporating the viscous dampers into the buildings has great superiority on enhancing its aseismic performance ; furthermore, this chapter also expatiates on diverse assembly form of the viscous dampers that results in the adverse impact on the internal force of the structural member in this building, on the ground of which this segment bring about the preference of the assembly form of the viscous damper; finally this chapter points out the sphere of application of the analysis and computation using Composite Response Spectra approach in design: it is available in well-proportioned stiffness structures and isn抰 available in the structures that contain weak story. It is recommendable, particularly, to incorporate the fluid viscous dampers into this structure that contain weak story to refrain earthquake and reinforce, such as the Central Hall of Shanghai Exhibition Hall.

首先使用了反应谱分析法设计出欲附设的粘滞阻尼器的线性阻尼系数,由于实际工程所用的粘滞阻尼器具有非线性的特性,故而笔者又证明了降低速度指数对提高粘滞阻尼器的耗能量的优势所在;接着分别从位移、层间位移、速度、层间速度、加速度、能量、最大阻尼出力和柱轴力等不同的角度对结构在附设粘滞阻尼器前后的时程反应进行了分析对比,籍此在实际工程中证明了附设粘滞阻尼器对于提高结构的抗震性能的优越性;再者,笔者还阐述了采用不同的粘滞阻尼器布置方式对结构中构件内力特别是柱轴力和基座竖向反力产生的不利影响,并在此基础上提出了布置方式的优选;最后,指出了反应谱法在设计中的适用范围:对于均匀结构反应谱法能够使用,而对于含有薄弱层的结构反应谱法并不适用;对于类似于上海展览馆中央大厅的含薄弱层的结构尤其值得使用粘滞阻尼器的方法进行抗震加固。

Trunnion of large size steel water pitcher can not wrought with rolled steel because the mechanical performance of the molten trunnion can not reach operating requirements and can only be forged with steel billet.

本文介绍了从钢锭的加热、锻造、锻后热处理3个方面提高大型耳轴的力学性能的方法,从而获得性能优良的耳轴。

The distribution of gear's contact stress, root stress, and contact engagement line in the engagement situation of gear pairs, were obtained on the base of explicit integration method. 3. Adopting the method of system matrix, the torsional vibration differential equation of general shafting was gained. The simple harmonic forms of excitation torque under the normal combustion or piston flameout of in-line engine and v-type engine were analysed. The decoupled algorithm of free vibration and forced vibration and the solution to the vibration damper's energy of resistance and the off-resonance calculation were studied. The sensitivity formulations of the natural frequency and vibration mode to physical parameters of system were derived by solving the eigenvalue problem. These sensitivity formulations provided the theoretical base for the dynamic modification of structure.

运用系统矩阵法建立了轴系的扭振微分方程,并对直列和V型发动机在正常发火和气缸熄火工况下的激振力矩进行了详细的简谐分析;基于精确方法推导了自由振动和强迫振动的解耦算法,给出了能量法计算中的减振器阻尼功求解和非共振计算方法;并研究了曲轴系扭振非线性分析中的变惯量问题,得到了单缸转动惯量的精确求解公式以及变惯量和固有频率的关系式;最后,从特征方程和振型正交性出发,推导了固有频率和振型对轴系转动惯量和刚度等物理参数的灵敏度,为扭振系统的结构动力学修改提供了理论基础。

The stepping-motor-driven warp let-off unit is applied to 1515-PJR flexible rapier loom. The warp tension is measured by using IBM-PC and CRAS software package. A new measuring index of warp tension for comparing the performance of warp let-off motion is given. The statistical analysis on the warp tension in the weaving process from full warp beam to empty is conducted. Also, the spectrum of the dynamic warp tension is analyzed, and the influences of the warp let-off motion' timing on warp tension are discussed.

本文研制的步进电机驱动送经装置在1515-PJR挠性剑杆织机上进行了实际织造运行,用IBM-PC微机和CRAS软件包对经纱张力进行了现场测试,提出了一项新的衡量送经装置性能好坏的经纱张力测量指标,对从满织轴到空轴织造过程中的经纱张力水平进行了统计分析,对经纱动态张力信号进行了频谱分析,并研究了送经运动的时间安排对经纱张力的影响。

Line'.''(measured counterclockwise from the positive half of the x-axis).

x轴和一条直线所形成的角(从x轴的正方向按逆时针方向测量)。

An integral ampule (50) is fillable by manipulation of a thrust rod/shaft which extends longitudinally through the device and is able to be grasped by a user.

通过操作一推杆/杆轴,可对一整体安瓿(50)进行充注,其中的杆轴在纵向上从装置中伸出,并可被用户夹持住。

Lundborg G. Structure and function of the intraneural microvessels as related to trauma, edema formation, and nerve function.

Dahlin等[5]从病理和生化方面的研究发现,神经压迫产生轴索内正向和逆向的轴浆运输障碍及细胞体的破坏,从而导致神经功能的异常。

We initiated a genetic screen for Drosophila olfactory genes by means of SG18.1-Gal4/UAS system: The result validates our screen as an rapid, effective approach for recovering genes controlling glomerular map patterning; From a misexpression screen of 1,515 P{GS} lines, we identified 23 genes that, when forcibly expressed in the olfactory receptor neurons, disrupted the stereotyped anatomy of the Drosophila antennal lobes; These genes, which have not been shown previously to control olfactory map development, encode novel proteins as well as proteins with known roles in axonal outgrowth and cytoskeletal remodeling.

本文首次利用SG18.1-Gal4/UAS基因筛选系统对果蝇嗅觉基因进行了筛选和鉴定:结果表明,所采用的方法可以快速、有效地分离到果蝇嗅觉相关基因;从1515株果蝇P{GS}品系分离到86株突变体,其中40株有明显表型,从中鉴定了23个基因,这些基因在ORN强迫表达时可以损坏果蝇嗅叶的固有结构;在筛选中发现的一些调节嗅觉图谱发育的基因可以编码新蛋白或编码参与轴突生长和细胞骨架重塑的蛋白;为了便于研究,根据基因的功能和所编码蛋白的特点,我们对分离到的基因进行了分类,即参与轴突引导和突触产生、调节转录、调节细胞骨架和功能未确定或未知的基因;并通过对嗅觉感觉器的检测发现,除了调节转录的基因外,其他基因对触觉器的数量和分布影响不明显。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。