查询词典 theoretical research

To overcome the drawbacks in the weight and cost of the antenna with the corrugated soft surface, a new patch antenna with patch rings is designed. Its weight is about 1/4 less than the antenna with the corrugated soft surface and it is inexpensive. Good experimental results are obtained. The radiation pattern of the antenna is more rotationally symmetric, and a more reduction on the sidelobe levels of the antenna is achieved as compared to the antenna with the corrugated soft surface. In conclusion, in the present thesis both theoretical and experimental research works have been carried out intensively on patch antennas based on photonic-bandgap structures.

为了克服皱褶软表面天线份量重，加工费用贵等缺点，我们对空气介质的皱褶圆环结构软表面天线进行了改进，将周期分布的皱褶圆环平面化，并保持结构的软表面特性，设计出了一种新的平面圆环结构的软表面天线并进行了实验研究，加工的平面圆环结构天线比皱褶圆环结构天线重量减轻了约1/4，加工费用大大降低，所取得的实验结果显示，该平面圆环结构软表面天线的方向图的轴对称性得到了改善，在俯仰角从0°～-90°的范围内天线H面的波束与E面重合，与皱褶圆环结构相比，天线的旁瓣和背瓣受到了更大的抑制，E面方向图上+120°方向的旁瓣被明显削弱。

It is shown that the contact interaction enables bottom drillstring to whirl backward, and then an alternate bending stress with higher frequency is produced. So the drillstring fatigue failure could be accelerated. At the same time, a quite strong wallop force of high frequency is produced on the contacting point, and the contacting zone is next to the screw coupling of drill collars. It will easily result in the failure of screw couplings. The research results provide theoretical basis for the prevention of drillstring failure.

研究表明，下部钻柱与井壁的碰摩作用使下部钻柱反向涡动，产生高频的交变弯曲应力，会加速下部钻柱疲劳破坏；下部钻柱与井壁接触点处存在较大的高频冲击力，并且接触区域靠近钻铤螺纹联结处，更容易诱发螺纹联结处失效，该研究成果可为预防钻柱失效提供理论依据。

The results of the research will provide theoretical basis and practical guidance for the question of childrens school readiness in China, which had the important theory value and the realistic significance.

本研究的结果为国内有关儿童入学准备问题的探讨提供了有力的理论依据和实践指导，具有重要的理论价值和现实意义。

On the basis of the status quo about Rice Rope Direct Sowing Technology research comprehensive analysis, paper had an theoretical analysis and experimental study to key equipment of the overall structure and parts of the machine of Rice Rope Seeding.

本文在全面分析种绳直播技术研究现状的基础上，对其关键设备水稻种绳直播机整体结构和各个零部件进行了理论分析与试验研究。

The research of this chapter, on one hand, sets a solid foundation for the following chapter three and chapter four, and on the other hand, provides the theoretical frame for setting up yield curve of zero-coupon bond of China.

本章的研究一方面为论文第三章第四章的研究打下了基础，另一方面为第五章中国零息票债券收益率曲线的构建提供了理论框架。

It includes three parts: theoretical derivations, empirical research and conclusion.

全文研究主要包括三个部分：理论推导、实证研究、结论。

Currently, research on principles of spatio-temporal data modeling is still in its infancy of theoretical explorations and experiments.

国际上，时空数据建模原理的研究目前主要处在一个广泛的理论和方法探索的实验阶段。

Theoretical and experimental research on removing characteristics of ultraprecise bonnet polishing methods are made to get an ultra-smooth surface for optical elements.

为得到空间光学元件超光滑表面，对超精密气囊抛光方法的去除特性进行了理论和实验研究。

Study in the primary field represents a student's major theoretical, practical and research concerns in his or her doctoral program.

在小学领域的研究代表了学生的专业理论性，实践性和他或她的博士课程研究的问题。

Studies in this thesis are explorative. Theoretical illuminations and partly experimental verifications have shown the availability of research results.

本文内容具有较强的探索性，理论上的阐述和实验的部分验证表明了论文研究思路的合理性。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。