中国邮路问题的0-1规划解法

在用“奇偶点图上作业法”求解“中国邮路问题”时,需检查图中的每一个回路.当图中回路较多时,检查不便且易出错.针对此,本文建立了求解“中国邮路问题”的0-1规划模型,并给出了算例。     

LAS和5种洗衣粉对水蚤的毒性试验

采用多刺裸腹蚤对ＬＡＳ（十二烷基苯磺酸钠）和５种洗衣粉的毒性作用进行了研究。结果表明，这些物质能够抑制多刺裸腹蚤的运动，并且造成蚤类的大量死亡。４８ｈ所测得的半数致死浓度ＬＣ５０值，ＬＡＳ为７．１ｍｇ／ｇ；白猫、碧浪、汰渍、奥妙、芳草等的ＬＣ５０值分别为６６ｍｇ／ｇ，５１ｍｇ／ｇ，３５．５ｍｇ／ｇ，４２ｍｇ／ｇ，５５ｍｇ／ｇ。     

山西锦生润票号衰败考论

锦生润票号诞生在光绪二十九年,恰逢山西票号鼎盛时代,然而,也是山西票号危机四伏、衰败初露端倪的时期.锦生润票号于民国六年冬月主动收歇,自有特别的个案的原因:锦生润不是完全意义上的山西票号,与经营了百年之久的其它票号不能简单地相提并论,仅仅是晚清山西商人开设账局的发展和延续,或者是账局与专业化汇兑的票号的有机结合的蓝本,属于一种新类型的票号.锦生润票号的衰败及其原因,也是票号发展历史阶段的一个极其重要的组成部分.     

广西农业科研院所科技开发现状、问题和对策研究

全面系统总结分析了广西农业科研院所科技开发现状，归纳出五大主要技术开发类型和目前科技开发存在的７个主要问题；提出了广西农业科研院所科技开发的十大措施与对策．     

Synthesis and photo-responsive behaviors of hollow polyazobenzene micro-spheres

By means of distillation precipitation polymerization, the silica-hybrid particles with polyazobenzene shell (PAzo@SiO₂) micro-spheres were prepared with 6-(4-methoxy-4′-oxy-azobenzene) hexyl methacrylate (Azo-M) as monomer, divinylbenzene (DVB) as cross-linker, and ~250 nm vinylated sol-gel silica particles as template. Hollow polyazobenzene microspheres were further developed after selective removal of the silica cores with HF solution. When the content of DVB related to Azo-M is 20 wt%, the acetonitrile is 200 mL, and the polymerization time is 4.5 h, the hollow PAzo microspheres with about 20 nm shell are successfully fabricated. These hollow PAzo microspheres have excellent reversible photoisomerization, and their first-order rate constant of trans-cis isomerization only decreases 11.8% compared with homopolymer of azobenzene (Homo-PAzo).     

浅谈声乐教育中的心理因素

本文认为,心理在声乐教学中的地位非常重要,在声乐教育中应该注意对学生心理情感的培养.     

基于C~#+SQL SERVER的网站通用注册模块的实现方法

登录注册页几乎是各个正规网站的访问起始页,这是出于网站安全考虑,也是各公司企业为方便管理众多客户所必需。本文以C#+SQL Server为基础设计了一个通用的注册模块,此模块可方便实现在页间传递参数或数据,具有较高实用性。     

Theoretical analysis of reactive solid-liquid interfacial energies

The characterization of reactive solid-liquid interfacial energies and solid surface energies is a pressing problem in materials science and surface science. Based on the concept that unbalanced forces doing work, a mathematical formulation between surface energies and interfacial energies for reactive wetting is presented. The resulting formalism has significant generality in which the equilibrium Young’s equation for solid-liquid interfacial energies is just a special case. It is shown that a solid-liquid interfacial energy at non-equilibrium is always higher than that at equilibrium, and that the transformation of reactive interfaces to equilib-rium interfaces is an inevitable, spontaneous process. The numerical range of solid-liquid interfacial energies γsl for a limited, solid-liquid interfacial wetting system was calculated to be 0 ≤γsl ≤γsg. The calculation methods for reactive solid-liquid interfacial energies and solid surface energies are presented. They are significant for composite materials and weld, powder sinter, package of electronic devices, and other surface and interfacial issues in metallurgy.     

钠桥联的一维链状钴(Ⅱ)配合物的合成、结构与光谱性质

以水杨醛肟为原料,经钠汞齐还原得到2-氨甲基-苯酚,再与水杨醛反应合成了配体L(L=bis(2-hydroxybenzyl)-amine).使用L配体和Co(NO3)·6H2O在水-甲醇溶液中制备了钠桥联的1维链状Co(Ⅱ)配合物[Na(methoxide)CoL2]n,解析了其晶体结构,应用元素分析、红外光谱等技术对配合物进行了表征.