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Because of the absorption of ozonosphere existing in higher level atmosphere,the sun-blind-region ultraviolet radiation (200～280nm) of solar spectrum could hardly reach the surface of the earth. Therefore, the communication system using this spectral coverage could hardly be disturbed.

由于地球大气上层臭氧的吸收作用，阳光中的日盲区(200～280nm)辐射几乎无法到达地球表面，因此，采用这个波段的光学通信系统几乎不会受到太阳光的干扰。

The melting point, optical rotation and infrared absorption spectrum of product wereidentical with the control product of CpHPG.

所制备的产物熔点、旋光性和红外光谱等与标准品一致。

Based on lots of experiments,this paper analyzes the ingredients of mixed substances through the optical rotational activity spectrum and presents a new way of measuring.

在大量实验的基础上，提出了一种用旋光光谱对混合旋光物质成份进行分析测定的方法。

Gamma ray bursts are high-energy transients in the gamma ray portion of the elctromagnetic spectrum that seem to be isotropically distributd in the sky.

珈玛射线爆发是一种在天空中呈现等向分布之电磁波中珈玛射线部分的高能瞬变。

Mitral valve insufficiency ; Field Ⅱ ultrasound simulation ; Blood flow imaging ; RF signals spectrum analysis

二尖瓣闭锁不全； Field Ⅱ超声模拟；血流成像； RF信号谱分析

According to the observation of the number concentration spectrum and the mass concentration of atmospheric aerosol, TSP and its particle size distribution,micrometeorology,and the solar spectroscopic radiation,even the neutron activation treatment of sand dust samples in Helan Mountainous area, the formation law of sandstrom, dust and sand blowing weather and the characteristics of climatic variation in this area and the influence of Helan Mountain are counted and analysed.

利用贺兰山地区沙尘暴历史资料和综合观测资料，对大气背景、浮尘、扬沙和沙尘暴发生期间的大气气溶胶数浓度谱、质量谱、大气总悬浮颗粒及粒径分布、微气象、分光日射观测以及沙尘样品进行中子活化处理，分析了该地区浮尘、扬沙和沙尘暴形成规律，气候变化特征和贺兰山的影响。

The primary amine of DETA is closed by ethyl methyl ketone to reduce the reactivity of –NCO group and –NH2 group and smooth the reaction process. The mole ratio value of –NH2/-NCO should be 2.2 to make sure that –NCO group is completely closed in by –NH2 group and amine terminate compound is prepared. The reaction temperature, reaction time and the way of adding raw materials to vessel are discussed. Structure and performance of the resin are analyzed with infrared ray spectrum.

用甲乙酮封闭DETA分子中的伯胺基团，降低-NCO与-NH2的反应活性，使反应平稳进行；研究投料比和投料方式对反应的影响；为确保生成以氨基封端的聚氨酯树脂，并将游离的异氰酸酯反应完全，最佳原料投料比控制在-NH2/-NCO=2.2；确定合理的合成条件如反应温度、时间等；利用红外光谱分析端氨基聚氨酯树脂的结构与性能。

On the opposite end of the career spectrum are lumberjacks .

名列职业排行榜另一端的是伐木工人。

When increasing the diameter of central defect medium pillar, the center frequency of the transmitted spectrum reduced.

当改变中心介质柱直径时，透射电磁波的中心频率随缺陷介质柱直径的增大而减小。

Moreover, this study could provide insight into developing the analysis models which are with higher precision and can be applied on secondary planet remote sensing.The major contents in this study and main results are the following:(1)In-situ spectrum measurement and laboratory absorption measurement.

通过本文研究，除了可以获取典型研究区水体悬浮物的固有光学性质特性外，还将了解其时空变异幅度和变化规律，从微观和宏观两个角度初步分析其影响因素，为发展出准确程度更高的、能够应用于卫星遥感的分析模型打下基础。

Objective:To explore the feasibility of laparoscopy in diagnosing and treating of abdominal diseases.

目的：探讨腹腔镜用以诊断腹部外科疾病及选择治疗方案的可行性。

The lifetime of nylon 1010 and nylon 1010/POSS composites decreased with increasing temperature.

热重-红外联用分析表明尼龙1010在氮气气氛下的降解产物主要为小分子的低聚物，POSS并不改变尼龙1010降解产物的组成。