集中在...上

Many researchers have devoted their work to the development of modal analysis extraction techniques in order to obtain more reliable identification of the modal parameters. There are many damping identification methods, but each one has different merit and defect. In order to find which one is the most reliable method with respect to certain characteristics, this thesis focus on how to identify structure's damping in time domain. The following works have been done in this thesis: 1. Investigate four modal analysis methods——the LSCE Method, the Ibrahim Time Domain Method, the Time Domain Collectivity Modal Parameter Method, the Rational Fraction Polynomial Method and improve on the ITD Method in arithmetic.

本文主要做了如下工作： 1、集中研究了四种常用的模态识别方法，即最小二乘复指数法、Ibrahim时域法、时域总体模态参数辨识法及有理分式多项式法，并对ITD法在算法上进行了一定的改进； 2、建立结构动力模型，利用这四种方法在具体条件下识别结构的阻尼，并绘制相应的图； 3、讨论不同的情况下，不同的识别方法对阻尼识别精确性的影响； 4、基于业已明确的阻尼识别的精确性，根据研究的需要，指出在实际的识别过程中，如何选择最佳的识别方法以及识别过程中需要注意的问题； 5、选择最为精确的阻尼识别方法，以导师李书进教授在日本京都大学防灾研究所强震反应实验室所做的一足尺木制结构房屋的动力测试实验为实测模型，识别其阻尼； 6、在本文的最后，尽作者所知，提出了一些需要改进的地方，并对未来的研究方向给出了作者的建议。

In order to ensure sensitivity and precision of transducer of spring beam,according to "stress concentration" design philosophy,based on reasonable choice of transducer,its strain and strength are calculated using FEM,the paster place of spring beam should be ascertained in reason,and the transducer's maximum strain orientation and measuring range are determined theoretically.

采用弹性梁对旧式液压万能材料试验机下横梁进行改造，为确保弹性梁传感器的灵敏度和精度，根据应用"应力集中"的设计原则，在合理选择传感器结构基础上，采用有限元法对其应变和强度进行计算，合理确定弹性梁的贴片部位，从理论上确定传感器的最大应变方位及传感器的量程。

Basing on a variety of source material and research achievement home and aboard,this paper attempts to describe the origins of the catholic survivalism and growth through the rooted culture and faith system during the late Middle Age,inadequate colonization policies, uninterrupted contest and economic policics.It is an inflection of the economic and political interations between the edge areaand the core area and outbreak in the form of religion.

本文主要以原始档案为基础，同时借鉴其它国内外已有的研究成果，通过考察爱尔兰天主教问题的历史渊源、嬗变、勃兴和爱尔兰天主教激进化转型的历史过程，认为爱尔兰天主教能够在大英帝国得以生存并发展壮大，根源于爱尔兰中世纪后期根深蒂固的文化信仰体系、新教不完全征服政策、外部势力有力支持、天主教徒长期反抗和经济上的不平衡政策，这实质上是不列颠空间整合过程中，边缘地区与核心地区之间的经济政治互动以宗教形式的集中爆发。

There are three copies of R fragment in the S mt-genome, and each copy contains two closely adjacent open reading frames: orf355 and orf77. Among these three copies two BamHI fragments were cloned, and the sequence analysis showed that cox1 and cox2 gene lies upstream of the R region in each fragment, respectively. However, they locate in different strands and head to head with R. In this study, we found that:(1) The expression of cox1 and cox2 is not affected by the transcription of R region;(2) The two copies of R region transcribe in large amount in the microspores, and produce transcripts of 1.6kb and 2.8kb, respectively, in the sterile microspores; However, the abundance of these two transcripts is reduced in the fertility restored microspores, realized through the mRNA decay, and this reduction occurs at the uninucleate microspore stage;(3) In the sterile microspores, the 5 terminus of the 1.6kb transcript contains a palindrome region that can fold into a stem-loop.

本研究发现：(1) cox1和cox2的转录没有受到R区转录的影响；(2)两个拷贝的R区在在不育花粉中高丰度表达，其转录本大小分别为1.6kb和2.8kb；而在育性恢复的花粉中，这两个转录本的丰度被大大降低，进一步分析表明这一结果是通过mRNA分子的降解途径来实现的，此降解过程发生在单核花粉期；(3)在不育花粉中，1.6kb转录本的5′末端具有一段可形成茎环结构的迴文对称序列，而在可育花粉中，其5′末端短缺了9个碱基；(4)在不育花粉和育性恢复的花粉中，R区转录本的加尾位点都集中位于一个3′茎环结构之后；(5)不管是在不育花粉还是育性恢复的花粉中，orf77区域内均在第52位和100位核苷酸处发生了不同频率的C向U的编辑，从而形成UGA终止密码；(6)不管是orf55-orf77的成熟转录本还是转录前体分子，都已被加上了Poly尾巴，表明已进入降解途径；在以上实验结果的基础上，本研究对S型CMS花粉育性的恢复机理进行了如下推测：在不育花粉和育性恢复的花粉中，orf77区域内均发生了终止编辑，即由RNA编辑产生了提前终止密码子。

On the basis of previously research, this paper re-probe into the mechanism of electro-chemist mechanical manufacturing process, making the rational technological parameter, and developing the manufacturing equipment. Through a lot of technology tests, get a lot of labratory data, accordingly, researched the surface feature of the electro-chemist manufacturing process, and deeply discussed its influence on the work piece feature. The last result is that: the electro-chemist mechanical manufacturing process can reduce the low-frequency component significantly, but on high-frequency component, it has little influence, having obviously positive pole flat effect. After manufacture, the tip parts on the surface of the work piece is cut off, there is micro "high land" shape, the parameter for surface roughness is reduced a lot, the surface outline of the work piece is negative, the bearing length rate is cliffy. Also the surface quality of the work piece is improved. This can help to avoid changing the shape, improve the feature of rub, gear and reduce the time to suit. This would also ensure the precision and result in a longer work piece life.

在以前研究的基础上，本论文重新探讨了电化学机械复合光整加工工艺的机理，确定了较合理的工艺参数，对电化学机械复合光整加工设备进行了改进，通过工艺实验广泛地搜集了大量实验数据，依据实验数据，多角度地研究了电化学机械复合光整加工的表面形貌特点，并且从理论上深入讨论了电化学机械复合光整加工表面形貌对工件工作性能的影响，最后得出的结论为：电化学机械复合光整加工对工件原始表面的低频成分有较大程度的降低，而对高频成分影响较小，有明显的阳极整平作用，被加工工件表面的尖峰状凸起被去除，工件表面呈现出微观&高原型&，表面轮廓不平度高度特性参数大幅度降低，工件表面轮廓分布集中，且呈负偏态，轮廓偏斜度为负值，轮廓支承长度率曲线陡峭，工件的表面质量得到综合改善，这对提高零件的抗接触变形能力、改善摩擦、磨损性能、降低工件的磨合时间、提高工件的精度保持性、延长工件的寿命均有利。

Based on the sedimentary system types, the characteristics of the favorable reservoir of Silurian in Tahe area are analyzed. It is considered that the vertical distribution of reservoir is controlled by tectonic movement and eustatic sea level change. The vertical distribution of reservoir is predicted. The favorable reservoirs converge in lower and upper Kepingtage Fomation and Tata' ai' ertage Formation

在识别出沉积体系类型的基础上，分析了塔河地区志留系有利储层特征，认为其储层纵向分布受构造运动及海平面升降变化控制，并预测其有利储层集中于柯坪塔格组下段、上段及塔塔埃尔塔格组。

In order to prvoide the new clue for the later tapping oil potential of maturing oilfiled, especially for the stratagem adjustment of high water-cut inefficient exploitation reservoir, and prolongate the realm and orientation of tapping oil potential, the waterflooding characteristics and the law of remaining oil distribution were studied.

结果表明，该块油层水淹程度仅80%左右，剩余油在平面上分布于区块的绝大部分区域，且与构造高低无明显关系，纵向上主要集中于层段的上部，尤其是位于该块西北区构造低部位的北断层区潜力单元，是与目前老油田潜力区主要局限于正向型微构造区所不同的新类型与新领域。

On the other hand, T -type twin and α〓 laths were preferentially formed at these nonequilibrium interfaces. The lath formation process involves complex transformations of the interfacial dislocation core and can be activated preferentially under concentrated stress fields at these interlamellar interfaces.

其二，热形变Ti-45Al-8Nb合金片层结构中，由于偏离严格取向关系的α〓/γ，γ/γ〓片层片层界面上具有较大的应力集中，外应力将优先在这些α〓/γ片层界面上诱导形成T型孪生位错，从而形成横过γ片层的T型孪晶。

At present, the studies of Nav1.8 focus on animal models, especially on spinal nerve injury and inflammatory pain. And there is a little in the studies about Nav1 .8 in trigeminal nerve systerm and the relationship between Nav1.8 and clinical pain diseases.

目前针对Na_v1.8的研究主要集中于动物模型特别是有关脊神经损伤性和炎症性疼痛模型上，而关于Na_v1.8在三叉神经系统中的研究以及Na_v1.8与临床上常见疼痛的相关性研究很少。

Valletta's320 monuments, all within an area of55 ha, make it one of the most concentrated historic areas in the world.

在方圆55公顷的土地上耸立的320出历史遗迹使瓦莱塔成为世界上古迹最集中的历史文化区。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。