缺少

The integral on infinite interval is an indispensable part of the theory of integral.

中文摘要：无穷区间上积分的讨论是积分理论中不可缺少的一部分。

A series of theoretical and experimental studies on the microstrip patch antennas with dielectric superstrates is carried out systematically. Firstly, a comprehensive survey of the microstrip antenna technology and its theories are presented. Then, two analysis techniques, named as the spectral domain Green's function method and the spectral domain integral equation method are developed. The SDGF method is a simplified analysis technique, which takes advantage of the spectral domain immittance approach to find the dyadic Green's function for the stratified media, and obtains the complete closed-form formulas for radiation patterns, directivity, efficiency, gain etc. Some interesting calculated results are presented. The SDIE method is capable of determining resonant frequency, radiation characteristics, input impedance etc, for the covered microstrip patch antennas. Comparing with other full-wave analyses it reduced computation and mathematical labour remarkably. The singularities near the pole location of the surface-wave modes and the difficulty of the integral computation over infinite range of oscillating integrands are dealt with actively and documented well. Results predicted by the SDIE method agree extremely well with our experimental results for resonant frequencies of various superstrates. The superstrate effects on impedance and radiation characteristics also have been investigated experimentally so that the gap due to lack of measured data and computed results for multi-layered superstrate has been filled to some degrees and two useful observations have been achieved for weakening the resonant frequency shift and optimizing the microstrip antenna gain. As a meaningful application, the design and analysis of a 4×4 patch array are introduced.

实用微带天线普遍加介质覆盖层来防护热，物理损伤和环境影响，也可能在飞行或严酷气候条件下自然形成覆盖层本论文对带介质覆盖层的微带贴片天线系统地作了一系列理论和实验研究首先，对微带天线技术和理论作了全面的综述然后，发展了两种分析方法，称为谱域格林函数法和谱域积分方程法SDGF法是一种简化的分析技术，它利用谱域导抗法来求得分层媒质的并矢格林函数，并得出方向图、方向性系数、增益等参数的完整的闭式公式，给出了一些令人感兴趣的计算结果SDIE法能确定介质覆盖微带天线的谐振频率、辐射特性和输入阻抗等与其它全波分析方法相比，它明显减小了计算量和数学工作量已有效地处理了表面波模极点附近的奇异性和对振荡的被积函数的无限区间积分计算的困难对于不同覆盖层情况下的谐振频率，由SDIE法所预示的结果与我们的实验结果吻合得很好对于覆盖层对阻抗和辐射特性的影响也已作了实验研究这在某种程度上填补了缺少实验数据和计算结果之间的间隙，并得出了缓解谐振频率偏移和优化天线增益的两点有用的结论作为有意义的应用，介绍了一个4×4元矩形贴片天线阵的设计和分析。

"In Japan, the weakness of peer reiew and professional discipline structures, the lack of mandatory hospital accreditation and the absence of objectie, hospital-by-hospital statistics on outcomes of medical treatment -- not to mention the relatie infrequency of ciil malpractice litigation -- enhances the social importance of criminal law as a way of increasing transparency in the medical world," Leflar said.

Leflar说："在日本，舆论和专业纪律结构软弱，缺少强制医院鉴定，缺乏目标。医院与医院间在医疗收入上统计比较，并不论及相关的罕见的民事医疗失误诉讼。提高法律的社会重要性已成为医疗界增加透明度的一种手段。"

The lack of investment inhibited the development of small companies .

缺少投资制约了小公司的发展。

Inositol is a kind of biological enzyme, an indispensable ingredient in organism.

肌醇是一种生物酵素，是生物体中不可缺少的成分。

Sometimes insatiability cannot be used to explain this anguished mind caused by the watery and passionless life.

对人类这这种因生命的平淡和缺少激情而苦恼的心态，有时是不能用不知足来解释的。

One can hardly attribute this mentality, arising from life's monotony and lack of passion, to insatiability on the part of humans.

对人类这种因生命的平淡和缺少激情而苦恼的心态，有时是不能用不知足来解释的。

However, ritual as an inseparable element of teaching and learning in class has been neglected in people's horizon, not to mention the analysis of its function, structure and operation.

仪式，作为课堂中教师教学和学生学习不可缺少的因素之一，一直处于人们的视野之外，并没有得到人们的重视和注意，更谈不上对其自身的功能、结构和进程进行深刻地分析，因此，笔者希望通过对课堂教学仪式及其具体实践的研究，从一个全新的角度对课堂教学本身进行探讨，以期能够得到进一步地展示和呈现。

The author argues that while the UMT network is coming into shape, the rail station is not only a building but also an inseparable element of the city life.

指出在轨道交通网络化的今天，车站已不仅仅是一个建筑物，而是城市生活中不可缺少的一个重要元素。

It always is an inseparable part of the research and development cycle.

它总是研究和开发周期中的一个不可缺少的部分。

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。