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A Study on Chinese Ancient String Bowed Instrument with Cylindrical Tube Resonator: The Change of It s Form

在长期的历史发展中，它的形制与功用均体现出浓厚的文化色彩，集多种功能于一身。

The third section studies the cause of evolution process and development characteristic of the String bowed instrument with cylindrical tube resonator,based on the above two section.

认为使用的便捷、社会和文化的影响、对人声的模仿均是圆筒类拉弦乐器形制发展的主要原因。

In global mode, annular omnidirectional images are captured by using skip subsampling mode to guarantee high frame rate, and then unwrapped to cylindrical panoramic images containing global scene information of 360 degrees. In local mode, the location and size of sampling window of image sensor are reconfigured according to the position of interested region, thereby only a corresponding rectangle region of omnidirectional images is captured by using pixel-by-pixel mode, and then unwrapped to a high- definition local perspective image of the corresponding view angle. Finally, a hardware design based on DSP+FPGA is presented.

在全局模式下，为保证采集帧速率，使用行列跳跃模式采集完整的环状全向图，并将其展开为包含360°全局信息的柱面全景图像；在局部模式下，根据感兴趣区域的空间位置设置采样窗口大小及位置，以逐像素采样模式只采集全向图中相应的一块矩形区域，并将其展开为对应视线方向上高清晰度的局部透视图；最后给出了DSP+FPGA结构的系统硬件设计方案。

At last, experimental research on stiffened cylindrical shell with internal substructure is done.

针对不同的子结构几何、材料特性参数，本文讨论了子结构的存在对壳体振动和声辐射特性的产生的影响。

Plants monoecious. Male inflorescence a globose to shortly cylindrical, pedunculate, many-flowered, head, grouped in terminal or subterminal, compound racemes or panicles; each flower with 1–4 basal bracts.

雌雄同株；雄花序一球状对短圆筒状，有花序梗，多花的，头状花序，在顶生或近顶生，复合总状花序或圆锥花序内归类；每花具1-4基部的苞片。

At rotary vane pump cavity eccentricity to install a rotor, rotor cylindrical surface tangent and the pump cavity, equipped with the rotor shafts of the two rotary vane spring.

在旋片泵的腔内偏心地安装一个转子，转子外圆与泵腔内表面相切，转子槽内装有带弹簧的二个旋片。

Rotary vane pump in the eccentricity of the cavity to install a rotor, rotor cylindrical surface tangent to the pump cavity, the rotor slot with a spring with two rotary vane.

在旋片泵的腔内偏心地安装一个转子，转子外圆与泵腔内表面相切，转子槽内装有带弹簧的二个旋片。

Firstly, the developing principles of the cylindrical internal helical gear are proposed through analyzing the movement and geometry requirements, which provides continuous contact between the mating gear surfaces. The tooth surface of the internal helical gear in the new gearing can be imagined as being generated by the normal section of the conjugated surface of the ball-tooth, moving along the radial projection of helix line of the tooth-root circle. Also, the proposed surface can be approximate tangent to the conjugated surface of the ball-tooth along a spacial curve.

首先，通过分析保证行星轮作螺环运动时与内斜齿轮实现连续啮合传动的运动和几何条件，提出了圆柱内斜齿轮齿面的两种形成原理：即由球齿运动包络曲面的法截面沿其齿根圆螺旋线在径向的投影进行拓展所形成的内齿面，以及与球齿运动包络曲面呈近似相切接触的等螺距齿面构成的内齿面。

In this paper, the fundamental problems of the dynamic buckling in cylindrical shells are axial impact, torsion impact and coupling impact. The dual variables in symplectic space are gotten from energy function, and the Hamiltonian system is established.

本文针对弹性圆柱壳在轴向冲击、扭转冲击、轴扭耦合冲击及径向均布压力和轴向冲击载荷耦合作用下的动态屈曲问题，借助于系统的能量构造出问题的原变量和对偶变量，建立了系统的哈密顿体系。

When the Hamiltonian system is introduced into the research of dynamic buckling in cylindrical shells, the problem uses dual variables in Symplectic space instead of variables in traditional Euclidean space. The symplectic eigenfunction expansion method gives out an exact solution space. So many problems are solved, which can not find the solution in traditional methods.

将哈密顿体系引入结构的动态屈曲研究中，其意义在于将结构的动态屈曲研究从传统的欧几里得几何空间进入到由原变量和对偶变量组成的辛几何空间之中，从而使辛本征函数展开的直接解析法得以实施，这样就可以求解许多以往半逆凑合法无法求解的问题，并且所得到的解空间是完备的。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。