The Twin Domination Numb er of Strong Pro duct of Digraphs

Let γ*(D) denote the twin domination number of digraph D and let D_1  D_2 denote the strong product of D_1 and D_2. In this paper, we obtain that the twin domination number of strong product of two directed cycles of length at least 2.Furthermore, we give a lower bound of the twin domination number of strong product of two digraphs, and prove that the twin domination number of strong product of the complete digraph and any digraph D equals the twin domination number of D.     

超长定向含铁多壁碳纳米管阵列的制备

采用无模板化学气相沉积法,以二茂铁为催化剂,二甲苯为碳源,利用单温炉加热装置制备了定向碳纳米管阵列。运用扫描电子显微镜、透射电子显微镜、拉曼光谱和X射线衍射仪等对定向碳纳米管阵列的形貌、成分和物相进行细致的分析和表征。结果表明:制得的碳纳米管阵列具有良好的定向性和多壁管状结构,并且石墨化程度高;碳纳米管中除碳元素外,管中包含有少量以纳米颗粒和纳米线形式存在的铁及其化合物,主要成分是铁和碳化铁。结合碳纳米管的制备和透射电子显微镜分析表征结果,认为超长碳纳米管阵列的生长模式为底部生长方式,即经历催化剂分解、催化、成核、长大、中毒、凝聚成粒和连接成线的循环过程,正是由于碳源和催化剂的连续供应促成了碳纳米管阵列的快速定向生长。     

Some class 1 graphs on <Emphasis Type="Italic">g</Emphasis><Subscript><Emphasis Type="Italic">c</Emphasis></Subscript>-colorings

An edge-coloring of a graph G is an assignment of colors to all the edges of G. A g _c -coloring of a graph G is an edge-coloring of G such that each color appears at each vertex at least g(v) times. The maximum integer k such that G has a g _c -coloring with k colors is called the g _c -chromatic index of G and denoted by \(\chi\prime_{g_{c}}\)(G). In this paper, we extend a result on edge-covering coloring of Zhang and Liu in 2011, and give a new sufficient condition for a simple graph G to satisfy \(\chi\prime_{g_{c}}\)(G) = δ _g (G), where \(\delta_{g}\left(G\right) = min_{v\epsilon V (G)}\left\{\lfloor\frac{d\left(v\right)}{g\left(v\right)}\rfloor\right\}\).     

气垫导轨的计算机辅助数据采集系统的设计

研制了基于USB接口的新型光电门,结合虚拟软件Audition 1.5与计算机声卡设计了一套计算机辅助数据采集系统,用于研究气垫导轨上滑块的运动规律.     

S波段低温低噪声放大器

中介绍了S波段低温低噪声放大器的研制.在15K左右的环境温度下,300MHz带宽内,实测放大器的等效噪声温度≤4.6K,增益≥35dB,增益平坦度≤1.0clB,输入、输出回波损耗≤-20dB.它已经成功运用于射电天文等领域.     

(Zr,V)N复合膜的结构、力学性能及摩擦性能研究

通过非平衡磁控溅射的方法制备了不同V含量的(Zr,V)N复合薄膜, 采用EDS, XRD, XPS, 纳米压痕仪和摩擦磨损仪等对薄膜的化学成分、微结构、力学性能及摩擦性能进行了研究. 结果表明, V的加入虽未改变ZrN的fcc晶体结构, 但使薄膜的择优取向由ZrN的(200)面转变为(Zr,V)N的(111)面. 随着V含量增加, (Zr,V)N复合膜的硬度略有升高后缓慢降低, 并在含25.8 at.%V后迅速降低. 与此同时, 薄膜的常温摩擦系数亦有小幅降低. 高温摩擦研究表明, (Zr,V)N薄膜在300 ℃时出现V₂O₃, V₂O₅ 在500 ℃后形成, 其含量也随温度的提高而增加. 薄膜的摩擦系数因V₂O₅ 的形成而得到显著降低. 关键词： (Zr,V)N 薄膜 微结构 力学性能 摩擦性能     

Faithful Transfer Arbitrary Pure States with Mixed Resources

In this paper, we show that some special mixed quantum resource experience the same property of pure entanglement such as Bell state for quantum teleportation. It is shown that one mixed state and three bits of classical communication cost can be used to teleport one unknown qubit compared with two bits via pure resources. The schemes are easily implement with model physical techniques. Moreover, these resources are also optimal and typical for faithfully remotely prepare an arbitrary qubit, two-qubit and three-qubit states with mixed quantum resources. Our schemes are completed as same as those with pure quantum entanglement resources except only 1 bit additional classical communication cost required. The success probability is independent of the form of the mixed resources.     

Stochastic calculus for Markov processes associated with non-symmetric Dirichlet forms

Nakao’s stochastic integrals for continuous additive functionals of zero energy are extended from the symmetric Dirichlet forms setting to the non-symmetric Dirichlet forms setting.It? ’s formula in terms of the extended stochastic integrals is obtained.     

新试剂N—壬基—N‘—（氨基对苯磺酸钠）硫脲（NPT）与钯（Ⅱ）显色？…

研究新合成的水溶性光度试剂Ｎ－壬基－Ｎ‘－（氨基对苯磺酸钠）硫脲与钯的显色反应。结果表明，在ｐＨ５．８－６．６的ＨＡｃ－ＮａＡｃ缓冲体系中，Ｐｄ＾２＋与ＮＴＰ形成１：４的黄色水溶性配合后物，ＣＴＭＡＢ对反应有明显的增敏作用，配合物的最大吸收波长位于２９７．６ｎｍ，表面摩尔吸光系数ε２９７．６＝１．２７×１０＾５Ｌ．ｍｏｌ＾－１ｃｍ＾－１，钯含量在２－１１．２μｇ／２５ｍＬ范围内服从比尔定律，５０种     

(p,n)和(p,2n)反应激发函数的系统学研究

从普朗克(Planck)黑体辐射公式和实验测量数据出发,采用唯象的方法提出了包含两个可调参量,入射质子能量从阈能到150MeV,靶核质量数在44相似文献