直流场致发光电视的灰度控制

1.前言 为了实现墙壁电视,很多单位正在研制用矩阵屏显示电视图象的装置,同时正在研究主要问题之一——灰度级的显示方法。 虽然矩阵屏的亮度控制有模拟信号法和数字信号法,但从装置的毫无调整、工作稳定和集成化(小形、低功耗)等方面看,数字方法是适当的。作者们以前试验了用加权的数个亮度控制脉冲来控制电视图象显示器的亮度~1)、~2),这方面,别人也发表了几个实例~3)、~4)~5)。但是因为作成实际的显示装置时要求电路结构简单,所以灰度级不能过多,因此必须探讨不只是灰度级多,而     

江苏省常州市城市地价动态监测信息系统设计与实现

以常州市为例,介绍地价监测点的设立过程,并对城市地价动态监测信息系统的总体设计思路作具体阐述．系统运用迭代增量法,采用GIS控件MapX进行开发．该系统已在常州市国土资源局局域网上日常运行,并利用地价监测点资料自动编制常州市地价指数,用以分析、预测常州市地价变化的基本趋势,为科学管理和合理利用城市土地资源提供科学依据．     

New type of spherical pore Al alloy foam with low porosity and high strength

The Ultra Light Metal Structure with variouskinds of pores (open, close) realizes the lightness andmultifunction of structural material. The functionsinclude lightness (ρ < 1), high specific strength, highenergy absorption, sound insulation, heat insulationand electromagnetism shield. It is one of the hotspotsin material research nowadays[1— . The requirements 6]of high speed movement and high technology make Alalloy foam, which has higher specific st…     

Synthesis and Crystal Structure of 1,2,4,6-Tetraphenyl-2-hydroxy-8-azabicycle[3,2,1]octane

1 INTRODUCTIONAtrope alkaloids, which exist in eggplant plants, such as atrope and scopolamine, are used as a series of important drugs in medical science [1,2]. The typical character of atrope alkaloid is that these compounds contain the main skeleton of 8-azabicycle[3,2,1]octane , which results in the very complicated synthetic routine[3]. During our research for the reaction of 1,3,5,7-tetraphenyl-4- nitro-1,7-heptadione with low-valent titanium reagent, we easily synthesized the title …     

鳕鱼皮水解蛋白亚铁修饰产物(Fe-FPH)结构及营养分析

以鳕鱼皮为原料,通过双酶水解法对制取蛋白铁肽功能食品进行了研究。结果表明:(1)最佳水解工艺为木瓜蛋白酶(2000000IU/g)和风味酶(400000IU/g)复配比为1:1,水解温度为45℃,料液比为1:2,pH为6.5,水解时间为4.5h,实际水解度DH为6.5%;(2)最佳螯合条件为DH6.5%、pH7.0、温度20℃、螯合时间15min,螯合效果:螯合率CR93.5%,铁含量4.3%,蛋白质含量85.0%;(3)最佳喷雾干燥工艺为进料温度50~60℃,进风温度205℃,出风温度90~95℃。同时对产品进行了氨基酸组成分析,结构分析、以及食品安全检测,得出结论:产品符合食品安全要求,且含有较高的营养价值,并能满足人体补铁需要。     

Site-specifically Hydrolytic Cleavage of Oxidized Insulin B Chain With Cu(II) Ion

Selectively chemical cleavage of peptides and proteins is one of the most important reactions in both chemical and biochemical processes. Over the past decade, the interaction of palladium(II) complexes with methionine, cysteine and histidine-containing peptides and proteins and the hydrolytic cleavage of the corresponding amide bond by Pd(II) complexes have been extensively studied1-13. However, reports concerning the directly selective hydrolysis of peptides and proteins with other simple …     

A New ent-Kaurane Diterpenoid from Isodon enanderianus

Isodon enanderianus (Hand. -Mazz.) H. W. Li, has been used in folk medicine as anti-inflammatory and detoxified agent1. The Isodon genus is known to be rich in ent-kaurane diterpenoids, a series of new ent-kaurane diterpenoids have been isolated from the dried leaves of I. enanderianus2-4. In order to find more biologically active substances, we have carefully investigated the chemical constituents of I. enanderianus collected in Shiping county of Yunnan province, and as a result, enanderi…     

Retention Behaviors of Uronic Acid-containing Polysaccharides and Neutral Polysaccharides in HPGPC

The determination of molecular weights (Mw) of polysaccharides has served as an important process since the physical properties of the polysaccharides are closely related to their Mw and/or molecular weights distribution (MWD). For Mw and MWD determinations, high performance gel permeation chromatography (HPGPC) has gained wide acceptance as a preferred method due to its high sensitivity, speed and reproducibility. In chromatography, it is well known that the molecular weights are determ…     

Synthesis and Structure of E-2-(2,4,6-tri tert butylphenylphosphinyl)-2-〔N-(tert-butyldimethylsilyl)-N-(p-chrolophenyl)〕amino-1-(2,4,6-tri tert-butyl-phenyl)phosphacthylene

1　INTRODUCTIONItwaswellknown thatelementsofthesecondary and higherrow are in generaldifficulty to form multiplebondsin which apπ hybridized stateisinvolved〔1〕.Thus,simple compounds containing multiple phosphorus carbon bonds,such as methyl dynephosphine( HC≡P) 〔2 - 3〕 and methylenephosphine( H2 C=PH〔4〕,are notstableat room temperature.Three methods to stabilize compounds containing double ormultiple bond involving phosphorusatom in the pπ hybridized state are often used.The f…     

β-二酮双核铜(I)配合物的合成、结构与性质

室温下,通过还原反应合成了双核铜(I)配合物[Cu(dppm)(ttfac)]2·(C4H8O)2(1),dppm=双二苯基膦甲烷,ttfac=2噻吩甲酰三氟丙酮,研究了配合物的物理化学和光谱性质,并经X射线单晶结构分析,确定了配合物(1)的分子结构,晶体属单斜晶系,空间群P2n,a=1.3000(3),b=1.3730(4),c=2.0372(9)nm,β=94.46(3)°,Dc=1.224gcm3,Z=2,V=3.625nm3,R=0.04493,中心铜离子分别由来自两个不同dppm的P原子和ttfac的两个氧原子形成四面体配位结构。