Compared with other instrument , the apparatus has many advantages , such as compact space , simple structure , low power waste , and anti - shake 与其它近红外仪器相比，本课题研制的仪器具有体积小、结构简单、低功耗、抗震动等特点。
The antenna can provide high isolation and low return loss in a compact space with simple fabrication , no needing complex feed network 整个两端口天线结构在满足回波损耗小和高隔离度的同时，还具有紧凑、不需要复杂馈电网络、制作简单的特点。
In this paper we establish some general theorems of internal characterizations of closed images and some sequence - covering l - images of paracompact local - spaces , which generalizes a few conclusions on the images of paracompact locally compact spaces and so on 本文建立了仿紧局部空间的闭映象、某些序列覆盖l映象的内在特征的一般性定理，推广了仿紧局部紧空间映象等的若干结论。
This paper contains three chapters . we discuss the pinching problems on the length of the second fundamental form of compact space - like submanifolds mn with unit parallel mean curvature vector in the de sitter space spn + p . in particular , a sufficient condition for mn with constant scalar curvature to be totally umbilical is given 讨论desitter空间s _ p ~ ( n + p )中具有平行的单位平均曲率向量的紧致类空子流形m ~ n的第二基本形式长度拼挤问题，给出了具有常数量曲率的这种子流形是全脐球面的一个充分条件。
