枪支弹头痕迹自动对比方法研究

建立了枪支弹头痕迹的自动识别模型.解决了细微信息提取,误差校正,特征位置选取等问题.以11只枪,22颗子弹的三维数据作为测试数据,模型的最高识别率达到77%.     

酰胺和酰亚胺改性聚乙烯的热分解行为

聚乙烯 (ＰＥ)的化学改性已得到广泛应用 ,它能使ＰＥ获得新的物理化学或功能特性 ,如改进其表面粘合、亲水及吸湿、染色和印刷性质等 ,尤其在增加它与其它聚合物的相容性 ,制备共混材料时常常是必不可少的[1 ,2 ] .目前最方便和有效的方法是通过马来化聚乙烯用不同基团接枝来实现化学改性 ,由于改性后的ＰＥ需经熔融加工成制品 ,化学改性基团必须在加工温度 ( 1 70～2 0 0℃ )和时间内具有足够的热稳定性 ,因此观察它们在热加工条件下的热稳定性和热分解行为显得十分重要 .通常这种化学改性的程度 (改性基团含量 )很小 ,并且在加工温度下所…     

Microarray of DNA probes on carboxylate functional beads surface

The microarray of DNA probes with 5' -NH2 and 5' -Tex/3' -NH2 modified terminus on 10 um carboxylate functional beads surface in the presence of 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC) is characterized in the preseni paper. it was found that the microarray capacity of DNA probes on the beads surface depends on the pH of the aqueous solution, the concentra-tion of DNA probe and the total surface area of the beads. On optimal conditions, the minimum distance of 20 mer single-stranded DNA probe microarrayed on beads surface is about 14 nm, while that of 20 mer double-stranded DNA probes is about 27 nm. If the probe length increases from 20 mer to 35 mer, its microarray density decreases correspondingly. Mechanism study shows that the binding mode of DNA probes on the beads surface is nearly parallel to the beads surface.     

Synthesis of N-t-Butyl-N'-Aminocarbonyl-N-(Substituted) Benzoylhydrazine Containing a -Aminoalkylphosphonate Groups

A variety of novel N-t-butyl-N'-aminocarbonyl-N-(substituted)benzoylhydrazines containing a -aminoalkylphosphonate groups were synthesized by the addition of N-t-butyl-N-(substituted)benzoylhydrazines to a -isocyanatoalkylphosphonates, which were synthesized by the reaction of a -aminoalkylphosphonates with triphosgene in good yields. The structures of products including by-products were confirmed by 1H NMR, 31P NMR, IR, mass spectroscopy, and elemental analysis.     

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…     

Studies on Chem icalCom position ofIron-m olybdenum Cofactor fromNitrogenase by Fluorescence Analysis

ＩｎｔｒｏｄｕｃｔｉｏｎＮｉｔｒｏｇｅｎａｓｅｆｒｏｍａｖａｒｉｅｔｙｏｆＮ２－ｆｉｘｉｎｇｏｒｇａｎｉｓｍｓｉｓｃｏｍｐｏｓｅｄｏｆｔｗｏ－ｃｏｍｐｏｎｅｎｔｐｒｏｔｅｉｎ，ＭｏＦｅ－ｐｒｏｔｅｉｎａｎｄＦｅ－ｐｒｏｔｅｉｎ．Ｆｅ－ｐｒｏｔｅｉｎｃｏｎｔａｉｎｓａｓｉｎｇｌｅＦｅ４Ｓ４－ｃｌｕｓｔｅｒ，ｗｈｉｃｈｈａｓｔｈｅｆｕｎｃｔｉｏｎｏｆｔｒａｎｓｆｅｒｉｎｇｅｌｅｃｔｒｏｎｓｆｒｏｍｄｏｎｏｒｔｏＭｏＦｅ－ｐｒｏｔｅｉｎ．ＭｏＦｅ－ｐｒｏｔｅｉｎｃｏｎｔａｉｎｓＰ－ｃｌｕｓｔｅｒｐａｉ…     

Crystal Structure of 2-[(P,P-Diphenoxy)phosphono(p-methyl)benzyl]-1, 2-benzisoselenazol-3(2H)-one

The crystal structure of the title compound 2-[(P, P-Diphenoxy)phosphono(p-methyl)benzyl]-1, 2-benzisoselenazol-3(2H)-one, C27H22NO4PSe, was determined by single crystal X-ray diffraction. It crystallizes in the triclinic system, space group P(No. 2) with Mr=534.41, a=9.761(2), b=10.304(2), c=13.396(3), α=110.97(3), β=107.70(3). γ=90.02(3)°, V=1190(1) 3, Z=2, Dx=1.492 g/cm3, λ=0.71073, μ=1.6596 mm-1 and F(000)=544. The structure was solved by direct methods. The final R factor is 0.068 and Rw is 0.074 for 2500 unique observed reflections [I≥3σ(I)]. The results presented herein indicate that the selenium-containing bicyclic moiety is a coplanar structure and that two adjacent molecules are symmetrically linked to each other forming a dimer through the Se(1c)...O=P(1) bonding interaction with an intermolecular Se(1c)...O distance of 2.797 .     

一种适合工程实用的捷联航姿算法

从工程实用的角度出发，针对惯性元件输出中存在干扰这一问题对四元数的三子样旋转矢量算法和四阶龙格－库塔法进行了分析和比较，指出四阶龙格－库塔法是一种具有工程实用价值的捷联航姿算法，并给出了在理想情况和有干扰的情况下算法的仿真结果。     

团队生产中的博弈模型与道德风险研究

首先根据团队生产在产出函数的特点,建立了由二人组成的团队生产模型;接着,在分析了团队生产的博弈过程后,求得团队成员努力投入的N ash均衡;最后,着重研究了两种证实团队生产中存在道德风险的方法.