共轴的

First we prove that all points on the imaginary axis except for zero belong to the resolvent set of the operator corresponding to the model, second prove that 0 is an eigenvalue of the operator and its adjoint operator with geometric multiplicity and algebraic multiplicity one,last by using theabove results we obtain that the time-dependent solution of the model str.

首先证明在虚轴上除了0以外其他所有点都属于该算子的豫解集，其次证明0是对应于该系统的主算子及其共轭算子的几何与代数重数为1的特征值，由此推出该系统的时间依赖解当时刻趋向于无穷时强收敛于系统的稳态解。

The Cardo structure could increase the solubility and thermal stability of the resultant polyimide.

通过在聚酰亚胺的主链中引入庞大侧基（9，9-二苯基芴）形成轴状聚酰亚胺，同时提高聚酰亚胺的溶解性和热稳定性；庞大的侧基又能阻止链的堆砌，避免生色团荧光链间淬灭；通过加入第二种二酐单体合成三元缩聚型聚酰亚胺，调控荧光性二酐在聚酰亚胺中的含量，降低生色团在聚酰亚胺中的浓度，来避免生色团荧光浓度淬灭，增加聚酰亚胺的固态荧光量子效率；通过使用热稳定性好的稠环生色团苝和吖啶来避免共轭类生色团（如含双键或三键的生色团）在高温下热交联及氧和水的破坏。

Common Reflection Surface stack is a brand-new and special ZO imaging method, the theory of CRS stack stems from paraxial ray theory, the biggest difference between CRS stack and conventional ZO imaging method is that it consider a reflector R as a circular reflector segment Cr placed in the vinicity of reflector R, Cr can be seen as the second order approximation of the reflector. The CRS traveltime surface is the multi-coverage reflection response of the reflector mirror assigned to R.

共反射面元（CommonReflection Surface=CRS）叠加技术是一种全新的、特殊的零偏移距剖面成像方法，CRS迭加理论源于傍轴射线理论，它与普通的零偏移距剖面成像方法的最大区别是它认为地下反射层是由许多个小反射弧段互相叠合组成的，认为来自某反射点附近的一个邻域内的反射信息都可以对该反射点的成像作出贡献，因此对该反射点进行零偏移距成像时就应该聚焦更多的能量参与迭加。

Especially, in some cases, where the required conditions that the connecting-line of the two pupils parallel to the reference plane and the projecting and imaging axes must be horizontal can not be met, the new method offers a flexible way to obtain the reliable height distribution of a measured object.

本文所提出的方法为在难以实现双瞳与参考面平行或难以使双轴共面的特殊环境下的测量提供了获得可靠测量结果的途径，同时也为傅里叶变换轮廓术进入实用领域打下了坚实的基础。

Several models are advanced in this dissertation, such as precision model with Kepler orbit and approximate models with conditions in the proper order of small orbital noncoplanarity, small eccentricity, short distance, short running time and equal orbital semimajor axis.

采用逐步递进的方式，推导了一系列对应Kepler轨道的精确表达式和对应小轨道非共面度、小轨道偏心率、近距离、短时间、相等的轨道半长轴等条件的近似表达式，以适合各种情形下对航天器相对轨道运动的描述。

objective: to evaluate the clinical application of helical ct for the location or treatment of maxilla embedded tooth in the dental orthopaedics.method: 18 cases with embedded tooth of maxilla were made with clinical examination, dentomaxillary pantomography, submaxilla lateral projection and helical ct.the operation be done for supernumerary tooth,distorted teeth,inverted tooth.three embedded tooth of non-inverted tooth were done by orthopaedics.result: among the 18 embedded tooth ,there were 11 palatally and 6 labially presented teeth,1 the 18 patients is mediately with completely inverted supernumerary tooth.all preoperative assessment are one and all in operative or orthopaedics and primary wound healing.

四川大学华西口腔医学院正畸科，四川成都 610041摘要：目的：正畸治疗中对上颌埋伏牙如何定性，定位，并要对此是采取手术拔除［1］或者是正畸治疗进行探讨。方法：对18例（其中1例为2颗多生牙，1颗多生牙已长出，另一颗为完全倒置的多生牙），上颌前部埋伏牙采用临床检查以及拍摄全景片、头侧位片螺旋ct轴位和表面成像等检查［2～4］对埋伏的多生牙、畸形牙和倒置牙共15例采用了相应的手术进路拔除，对形态正常且不倒置的3颗埋伏牙采用了正畸治疗。

To protect the interests of customers, products factory implementation Three Guarantees, where I purchased the plant roller Liu Bingxie customers can enjoy at the end of Liang aluminum, frame, Juan Zhi round of fracture within a year if full compensation for the replacement, vamps Some three months warranty service, I adhere to the after-sale maintenance plant services, supply of spare parts for the commitment of "quality first, customers first, service first" purpose, with the vast number of old and new customers to join hands in creating the brilliant Chinese Track Industry .

为保障广大客户利益，本厂实行产品三包，凡购买我厂滚轴溜冰鞋的客户，均可享受铝合金底墚、支架、聚胺脂轮一年内如有断裂全部赔偿更换，鞋面部分三个月保修的服务，我厂坚持售后检修服务，零配件优惠供应的承诺，&质量第一，客户第一，服务第一&的宗旨，与广大新旧客户携手共创中国轮滑产业的辉煌。

Single-mode fiber-optical confocal scanning laser microscopy is a new scanning microscopic imaging system, which is based on the modern optics technology and electronics technology. The characteristic of point source and point detector removes the out-of-focus light that makes the image become blur. Therefore, it has excellent resolution in axial directions, and can achieve 3-D imaging of microorganism.

单模光纤激光共焦扫描显微镜是现代光电技术结合的新型扫描显微成像系统，其独特的点照明与点探测机理排除了离焦光线对图像造成的模糊和斑点影响，因而具有出众的轴向分辨率，能够实现对微小物体的三维成像。

Laser confocal scanning microscopy is a new technology combining modern optics and electronics. The unique feature of point light source and point detecting eliminates out-of-focus blur and spots. Therefore, the axial and lateral resolution of the system is superior and 3-D imaging can be realized by scanning point by point of the object profile. Because of its advantages, confocal measurement technology is widely applied in many fields, such as medical treatment, biology, configuration of substances and micro-electronics.

激光共焦扫描显微术是结合了现代光电技术的新型扫描显微成像方法，其独特的点照明与点探测机理排除了离焦光线对图像造成的模糊和斑点影响，因而具有出众的轴向分辨率和横向分辨率；采用扫描技术在样品表面的各点逐点扫描，能够实现对微小物体的三维成像，因此在医疗、生物、物质结构、微电子等领域均具有广泛的应用。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。