R上分段单调和分段加倍的加倍权

该文研究了R上几类权函数为加倍权的条件.首先给出了R上单调权函数为加倍权的充要条件;其次刻画了R上分段单调权函数为加倍权的条件;最后讨论了R上分段加倍权函数为加倍权的条件.     

功能性马丙共聚物树脂富集-分光光度法测定痕量铁(Ⅲ)

建立了功能性马来酸酐、丙烯酰胺共聚物树脂P(MA-AM)富集-分光光度法测定痕量Fe(Ⅲ)的新方法。考察了树脂对痕量Fe(Ⅲ)的吸附、洗脱行为。结果表明,在pH=3.5时,P(MA-AM)能富集Fe(Ⅲ),吸附30min时,最大吸附率达98.7%;以3.0mol/L的HCl作为洗脱液,Fe(Ⅲ)的回收率为96.2%;富集倍数可达20倍。该方法的检出限为0.02mg/L,相对标准偏差为3.0%,回收率范围为93.3%～97.6%。方法可应用于实际样品中痕量Fe(Ⅲ)的测定。     

稀土元素的摩擦学研究发展概况

本文对稀土元素的摩擦学研究发展概况作了综述与讨论,主要涉及的是稀土金属及稀土无机化合物和稀土配合物作为润滑油、脂及润滑涂层的添加剂的摩擦学特性,并对稀土无机化合物的高温润滑特性、稀土金属及其化合物在高温涂层中的应用作了简要讨论,最后还提出了稀土的摩擦学研究中当前值得注意的几个重要课题。     

视频文字信息检查工具的设计与实现

针对某些特定视频中,画面文字信息经常包含较为敏感文字信息,导致信息泄露,设计实现了一种视频画面中的文字的检测识别系统,对视频画面中的文字标语、文字条幅,新闻画面中的文字导语等信息进行识别与比对。采用基于双阈值的视频镜头分割算法,根据颜色直方图信息提取关键帧,采用最大稳定极值区域算法提取图像中稳定区域,通过聚类和级联分类器实现文字区域提取,最后将文字区域分割后进行OCR识别,实验表明,设计的系统针对复杂背景中的文字能够达到较高的检测识别率。     

碳酸钙固定化猪胰脂肪酶的制备及活性研究

本文利用市售普通碳酸钙(general calcium carbonate,GCC)作为猪胰脂肪酶(PPL)固定化的载体材料,研究了不同固定化条件对所制备的固定化酶活性的影响.结果显示PPL固定化于GCC上的最佳制备工艺为:将20 mL酶液与1.50 g GCC放入置于摇床内的三角瓶中,摇床温度设为40℃,摇床转速设为...     

例说建构递归关系证明不等式的模式

众所周知 ,因题而异证明不等式的方法甚多 ,本文旨在介绍一种证明不等式的新方法———建构递归关系法 .为简明见 ,本文举三个例题说明三种典型的建构递归关系证明不等式的模式 .1　建构递归关系模式Ⅰ例 1　在△ＡＢＣ中 ,试证 : ｓｉｎＡ≤332 .(其中和号 关于Ａ ,Ｂ ,Ｃ轮换 ,下同 )证　先证 ｓｉｎＡ≤ ｓｉｎπ -Ａ2 .事实上ｓｉｎＡ ｓｉｎＢ =2ｓｉｎＡ Ｂ2 ｃｏｓＡ -Ｂ2≤ 2ｓｉｎＡ Ｂ2=2ｓｉｎπ -Ｃ2 (1)同理 :ｓｉｎＢ ｓｉｎＣ≤ 2ｓｉｎπ -Ａ2 (2 )ｓｉｎＣ ｓｉｎＡ≤ 2ｓｉｎπ -Ｂ2 (3)由 (1) (2 ) (3)整理得 …     

完全图分拆为带两条弦的6-长圈

In this paper, we discuss the G-decomposition of λKv into 6-circuits with two chords. We construct some holey G-designs using sharply 2-transitive group, and present the recursive structure by PBD. We also give a unified method to construct G-designs when the index equals the edge number of the discussed graph. Finally, the existence of G-GDλ（v） is given.     

A scheme of optical interconnection for super high speed parallel computer

An optical cross connection network which adopts coarse wavelength division multiplexing (CWDM) and data packet is introduced. It can be used to realize communication between multi-CPU and multi-MEM in parallel computing system. It provides an effective way to upgrade the capability of parallel computer by combining optical wavelength division multiplexing (WDM) and data packet switching technology. CWDM used in network construction, optical cross connection (OXC) based on optical switch arrays, and data packet format used in network construction were analyzed. We have also done the optimizing analysis of the number of optical switches needed in different scales of network in this paper. The architecture of the optical interconnection for 8 wavelength channels and 128 bits parallel transmission has been researched. Finally, a parallel transmission system with 4 nodes, 8 channels per node, has been designed.     

O～3岁儿童微量元素检测及纠正150例观察与体会

对西安地区150例0～3岁儿童进行了六种微量元素：钙、锌、铜、铁、镁、硒的检测，发现微量元素缺乏可导致急慢性感染、免疫力低下、小儿营养不良、贫血、发育迟缓等症状。并对小儿营养不良、喂养不当进行矫正。其中铁、钙、锌同时缺乏占50％。     

Self-assembly of Carboxyl Functionalized Polystyrene Nanospheres into Close-packed Monolayers via Chemical Adsorption

The polyacrylic acid functionalized polystyrene nanospheres were synthesized and self-assembled into irregular, densely packed monolayers in non-aqueous media. The polymer nanoparticles were chemically adhered to substrates. The morphologies of the resulting films were investigated. The impact of the volume fraction of alcohol in the mixed solvents on the particle adsorption and fabrication of nanosphere assembled films was examined.