雷击气象风塔时浪涌电流和电压分布规律的分析

针对雷击气象风塔造成气象仪器损害的问题,根据传输线的传输理论考虑到雷电流在雷击通道、气象风塔与大地间的反射,分析了气象风塔中浪涌电流和电压的分布规律,通过实例计算雷击气象风塔雷击电流的分布及浪涌电压响应,总结出雷击通道中浪涌电压和电流的变化规律,提出了气象风塔越高其顶部浪涌电压响应越高,而气象风塔阻抗越小,风塔中入射电流越小,相应地影响了安装在气象风塔上气象设备的正常运行。

雷达在物位测量中的应用

对雷达式传感器的测量原理及运用特点进行了说明，

Radar Cross Section Prediction and Reduction for Naval Ships

Radar cross section（RCS） is the measurement of the reflective strength of a target.Reducing the RCS of a naval ship enables its late detection,which is useful for capitalizing on elements of surprise and initiative.Thus,the RCS of a naval ship has become a very important design factor for achieving surprise,initiative,and survivability.Consequently,accurate RCS determination and RCS reduction are of extreme importance for a naval ship.The purpose of this paper is to provide an understanding of the theoretical background and engineering approach to deal with RCS prediction and reduction for naval ships.The importance of RCS,radar fundamentals,RCS basics,RCS prediction methods,and RCS reduction methods for naval ships is also discussed.

Reflectivity/Impulsivity as an Important Individual Factor and Effectiveness of Awareness Raising Activities

This paper is a summary of the studies done on the importance of the cognitive styles especially reflectivity/impulsivity on the process of language acquisition. It discusses the importance of this cognitive style as an important factor on the effectiveness of awareness raising activities. In the previous studies, the importance of awareness raising has been found as an effective and facilitating factor in the process of the L2 （second language） acquisition, but the effect of different individual factors on its being usefulness has not been focused on; therefore, this study is an attempt to review and explore the importance of one of the individual factors, i.e., being reflective/impulsive cognitive style on the effectiveness of awareness raising activities. It is gathered that learners with different cognitive styles （being reflective/impulsive） react differently to the awareness giving activities, and the study tries to emphasize the importance of this factor on the usefulness of awareness raising and emphasizes the fact that in the field of awareness giving this factor should be attached impotence and accounted for as an effective factor.

The Microwave Synthesis of 2,6-Pyridine Dicarboxylic Hydrazine

Under microwave irradiation, with dimethypyridine-2,6-dicarboxylate and hydrazine hydrate as raw materials, 2,6-pyridine dicarboxylic hydrazine was produced. At the same time, the influence factors of production rate, such as microwave radiation time, reaction power, the amount of dimethypyridine-2,6-dicarboxylate and hydrazine hydrate was further explored. Through the orthogonal experiments, better technology conditions were found which make the synthetic process turn from the new type of microwave technology.

预防手术体位不当所致并发症的体会

手术治疗中,不同的手术要求不同体位。手术体位安置不当,可造成生理性和解剖性两类并发症。生理性则由重力因素和反射因素引起,表现为呼吸循环的改变。解剖性则由压迫、牵拉和过度限制而引起,表现在周围神经或软组织的损伤。本文根据20年来临床工作中无1例并发症发生,将预防手术体位不当所致并发症的体会报告如下。

A tasseled cap transformation for CBERS-02B CCD data

The tasseled cap transformation of remote sensing data has been widely used in agriculture,forest,ecology,and landscape.In this paper,tasseled cap transformation coefficients appropriate for data from a new sensor(China & Brazil Earth Resource Satellite(CBERS-02B)) are presented.The first three components after transformation captured 98% of the four-band variance,and represent the physical characteristics of brightness(coefficients:0.509,0.431,0.330,and 0.668),greenness(coefficients:0.494,0.318,0.324,and 0.741),and blueness(coefficients:0.581,0.070,0.811,and 0.003),respectively.We hope these results will enhance the application of CBERS-02B charge-coupled device(CCD) data in the areas of agriculture,forest,ecology,and landscape.