铝的阳极氧化和电解着色——Ⅳ.铝表面交流电解着古铜色的研究

本文研究铝表面上交流电解着古铜色的着色过程,试验和分析了溶液成份、着色时间、添加剂、着色温度、溶液pH值和杂质离子对着色过程的影响,确定了能够得到均匀的、重复性较好的古铜色膜的工艺条件。测试结果表明:该着色膜的耐蚀和耐热性能良好。     

氧化焰烧成氧化物着色电瓷棕红釉的研究

以石灰一碱釉为基础釉，Fe2O3、Cr2O3、MnO2为着色剂，研制一种适合于氧化焰烧成电瓷的棕红色釉。实验结果表明，当烧成温度为1260℃、着色氧化物的引入总量为7％～8％、Fe2O3：Cr2O2：MnO2=3：1．5：3(wt)时，釉料呈现稳定的棕红色，且与坯体的适应性良好，完全能够满足氧化焰烧成电瓷的要求。用XRD、色度仪等对釉的组成、结构及色泽之间的关系进行了探讨。     

Technology of black coloring for stainless steel by electrochemical method

The technology of black coloring for stainless steel by electrochemical method was studied. The optimum bath compositions and operating conditions were obtained as follows. 40 - 50 g/L K2Cr2O7, 15 - 20 g/L MnSO4, 15 -20 g/L （NH4）2SO4, 20 -40 g/L H3BO3, 20 -30 g/L additive A, 2 g/L （NH4）6Mo7O24 ; time 9 -20 min; temperature 15 - 30 ℃ ; potential 3 V and current density 1 - 2 mA/cm^2. The effects of the compositions of the bath on the quality of black colored film were discussed. The influences of passivation process on the black coloring velocity and performances of black colored film layer were investigated. The results show that the passivation process can improve the corrosion resistance and the stability to bear color-change; （NH4）2 SO4 can control the black coloring velocity and prolong black coloring bath life remarkably; and additive A can improve the evenness and compactness of black colored film layer. The results of scanning electron microscopy and energy dispersive spectra show that the microstructure is of cylindrical lump, the filling process can decrease the crackles, and the main elements of black colored film are Fe, Cr, Mn and Ni.     

整数距离图G（Dm，3）的点线性荫度

整数距离图G（D）以全体整数为顶点集，顶点u，v相邻当且仅当│u-v│∈D，其中D是一个正整数集．对于m〉3，设Dm，3={1，2，…，m│＼│3}，本文得到了G（Dm,3）的点线性荫度的上界和下界并决定出了它在某些较小的m上的确切值．     

宁夏马莲台发电厂#2机中压内缸制造缺陷的检验及分析处理

详细叙述了宁夏马莲台发电厂#2汽轮机中压内缸制造过程中重大缺陷的检验和处理过程。给出了具体的检验方法、检验结果、分析处理依据及具体的焊补工艺。     

2-树的点边列表染色

证明了 2 -树 ,当△ ( G)≥ 4时 ,点边选择数等于图的最大度加 1     

Total Coloring of G×P_n and G×C_n

1 IntroductionGraph treated in this paper are finite, undirected, loopless and without multiple edges. For a graph G, we use V(G) (resp.E(G)) to denote its set of vertices (resp.edges).The n colors are labled by 0,1,(, n-1, respectively.A total coloring of a graph G is a map , f, from the set E(G)∪V(G) to the set of colors C such that no two incident nor adjacent element of E(G)∪V(G) are painted by the same color. If |C | = k, then G is said to be k-colorable.The total chromatic numb…     

关于图的局部调和着色

通过引入图的局部调和着色的概念,给出了任意图的局部调和着色的不可改进的上、下界;同时讨论了图的局部调和着色的一些性质,以及一些特殊图的局部调和着色数.     

A Five-Phase Reservation Protocol (FPRP) for Mobile Ad Hoc Networks

A new single channel, time division multiple access (TDMA)-based broadcast scheduling protocol, termed the Five-Phase Reservation Protocol (FPRP), is presented for mobile ad hoc networks. The protocol jointly and simultaneously performs the tasks of channel access and node broadcast scheduling. The protocol allows nodes to make reservations within TDMA broadcast schedules. It employs a contention-based mechanism with which nodes compete with each other to acquire TDMA slots. The FPRP is free of the hidden terminal problem, and is designed such that reservations can be made quickly and efficiently with negligible probability of conflict. It is fully-distributed and parallel (a reservation is made through a localized conversation between nodes in a 2-hop neighborhood), and is thus scalable. A multihop ALOHA policy is developed to support the FPRP. This policy uses a multihop, pseudo-Bayesian algorithm to calculate contention probabilities and enable faster convergence of the reservation procedure. The performance of the protocol, measured in terms of scheduling quality, scheduling overhead and robustness in the presence of nodal mobility, has been studied via simulations. The results showed that the protocol works very well in all three aspects. Some future work and applications are also discussed.