一种新体制雷达合成宽带可行性分析

本文分析阐述了利用脉内调频、脉间跳频技术获取距离高分辨一维成像的可行性,导出了静止目标和运动目标的回波表达式.根据线性调频子脉冲的回波表达式,详细分析了运动目标回波对信号处理器采样位置的要求.     

Two New Monoterpene Diglycosides from Winchia calophylla A. DC

Two new monoterpene diglycosides, wincaloside A (1) and wincaloside B (2), along with loganin (3) were isolated from the stem barks of Winchia calophylla A. DC. The structures of 1 and 2 were established by spectroscopic and chemical methods.     

显示器色度测量仪器及测量方法

论述了与显示器相关的色度测量仪器、显示器的色度测量原理及测量方法。     

Synthesis of a new complex Chromium (Ⅲ) 2-mercaptonicotinate

Chromium is an essential trace element for mammals[1-3].Diabetes is a chronic disease with major health consequence. Studies show that the occurrence of diabetes have great thing to do with the chromium deficient. Almost 40 years after the first report of glucose tolerance factor(GTF)[4]no conclusive evidence for an isolable ,biologically active form of chromium exited. Three materials have been proposed to be the biologically active form of chromium: "glucose tolerance factor", chromium Picolinate and low-molecular-weight chromium-binding substance (LWMCr)[5]So there is potential for the design of new chromium drugs[6].Chromium compounds have been used in medicine for centuries and there is potential for the design of new chromium drugs.2-Mercaptonicotinic acid(MN) displays the interesting biological activity. Chromium( Ⅲ )2-mercaptonicotinate is a common and effective biologically active form of Chromium. The test of biological activity indicated that may be useful in treating of diabetes. In this paper, we reported the The synthesis route is as follow:The structure of the complex has been characterized by IR, elemental analysis, MS,atomic absorption spectroscopy, X-ray powder diffraction and TG-DTA analysis.They indicate that the structure of Chromium 2-mercaptonicotinate.HPLC is used for determination of the purity. Studies show that the complex has a good biological activity for supplement tiny dietary chromium,lowering blood glucose levels, lowering serum lipid levels and increasing lean body mass.     

低温氮化硅薄膜的介电性能研究

研究了微波电子回旋共振等离子体化学汽相沉积低温氮化硅薄膜在5—10⁶Hz频率范围内的介电性能．由于低温氮化硅薄膜为具有分形结构的纳米非晶薄膜，致使氮化硅薄膜的介电谱、损耗谱在低频区和高频区具有两种不同的分布规律．在低频区介电谱具有ε′∝ω^n－1₁的关系，ｎ₁在0.82—0.88之间，是电子跳跃导电的结果；在高频区介电谱具有ε′∝ω^n-1₂的关系，n₂在0 关键词：     

1 V低功耗套筒式CMOS运算放大器的设计

介绍了一种用于低电压CMOS模拟集成电路设计的阈值调节思想。利用该思想,在0.35μm标准CMOS工艺条件下,设计出电源电压仅为1 V的套筒结构集成运算放大器(Tele-scopic OPA)。HSPICE仿真表明,与传统结构相比,新型结构在保证增益、带宽等放大器重要指标的基础上,功耗有了显著的降低。     

Problems on Two-dimensional Bandwidth under Distance of L_∞-norm

The two-dimensional bandwidth problem is to determine an embedding of graph G in a grid graph in the plane such that the longest edges are as short as possible. In this paper we study the problem under the distance of L∞-norm.     

Steinhause棋盘问题的一个推广

In the present paper, a generalization of Steinhaus' chessboard problem of 8 × 8 and that of m×n are given and its solution is proved. Then, Steinhaus' chessboard problem is directly solved as a corollary, and the m>n case is solved immediately.     

高温超导Ni-W基带的织构研究

涂层超导是目前国际超导界的研究热点和重点,所采用的韧性金属基带多为Ni和Ni-W合金.本文采用粉末冶金方法制备了Ni-3 at.%W和Ni-5 at.%W合金.利用轧制辅助双轴织构基带(RABiTS)技术制备了Ni-W合金基带,系统研究了Ni-W合金形变和再结晶织构转变规律.研究表明:通过大变形量的冷轧和高温再结晶退火,可以得到强立方织构的Ni-W合金基带.     

酞菁钴吡啶轴向配合物的合成及表征

从4-硝基邻苯二腈出发，首先合成了酞菁钴的衍生物——对称的四取代烷基苯氧基酞菁钴，并以此为基础，采用溶剂热的方法合成了与吡啶形成的无取代轴向配合物，对相关化合物进行了红外、紫外、质谱的表征．初步尝试了由溶剂热的方法制备金属酞菁轴向配合物．