锅炉过热器/再热器管道热流密度的评估方法

通过建立数值模型进行编程计算,分析了锅炉过热器/再热器管道在不同的管道几何尺寸、烟气温度、蒸汽流量和温度下,各个界面热流密度的变化情况。通过回归分析得到了热流密度与管道内壁侧氧化层厚度和运行时间的关系表达式,即热流密度的评估关系式。     

从媒体控制探讨媒体工作者的性观念与性道德

从媒体控制考察媒体工作者的性观念与性道德,围绕媒体工作者的双重身份——普通大众与媒体人,对媒体工作者进行实证调查,分析得出媒体工作者的性观念与性道德总体上趋于保守和规范,但仍存在偏离现象。     

云南综合类高校教学质量调查与分析——基于学生视角的教学质量现状分析

通过文献检索、问卷调查等方式,将在校生对学校教学环境的满意度、对学校和专业的认同感、对学校教学活动的认同感、参与学校管理的意识、见习状况、教学成效等因素的满意度作为高校教学质量评估体系构成的主要内容,对云南省4所综合类高校的教学质量进行调查研究,探讨云南省综合类高校教学质量存在的问题,并在此基础上提出相应对策。     

协合型增稠剂的流变性及其应用性能的研究

本文采用Brookfield RVT型旋转粘度计进行粘度测定,研究协合协增稠剂的流变性,将粘度数据进行计算机处理,回归出Casson方程,获得屈服值和无穷大剪切粘度,以描述增稠体系的遮盖力、稳定性、流平和流挂、沉降等性质,并对耐电解质性和后增稠进行了测试。本方法通过对粘度的测定,提供了一种对增稠剂的应用性能进行综合评价的途径。     

一类非光滑非凸分式半无限规划的最优性

在一致Fb-凸函数，一致Fb-伪凸和一致Fb-拟凸等广义凸性函数的基础上，研究了一类分式半无限规划问题，得到了涉及这些广义凸性函数的一类非光滑分式半无限规划的一些最优条件。     

Consecutively spin-assembled layered nanoarchitectures of poly(sodium 4-styrene sulfonate) and poly(allylamine hydrochloride)

The recently established spin-coating electrostatic self-assembly (SCESA) technique has been shown to facilitate not only the rapid fabrication of polyelectrolyte multilayer assemblies, but also allow each layer to be easily controlled on a monomolecular scale by minimizing the film thickness across a substrate surface. In this paper, the influence of polyelectrolyte concentration on the amount and thickness of spin-deposited polymer films has been examined for a multilayer system of poly(allyamine hydrochloride) (PAH) and poly(sodium 4-styrenesulfonate) (PSS), when the washing steps employed for removing weakly bound polyelectrolytes on a resultant film on a substrate are excluded from the standard fabrication procedure of the SCESA method. The thickness of the spin-deposited PAH/PSS bilayer increased linearly for the PSS concentrations in the range from 1 to 10 mM with PAH constant at 1 mM, which demonstrates the uniform deposition of each layer material onto the thin film. The thickness of PAH/PSS bilayers increased from 1.43 ± 0.06 to 3.37 ± 0.08 nm as the PSS concentration increased from 1 to 10 mM, while the PAH concentration was kept constant at 1 mM. The multilayer films were found to be stable in a good solvent (H₂O) for at least 30 h, without any noticeable loss of the adsorbed layer component of the polyelectrolyte. This improvement to the SCESA method (exclusion of washing steps) provides a convenient way to create multilayer heterostructures with the thickness of each layer being easily adjusted.     

超高压并联电抗器的结构特点和运行情况综述

综述了国内外超高压并联电抗器的设计制造和运行情况；重点介绍了国内外不同厂家生产的电抗器的结构特点,以及针对并联电抗器的漏磁发热、振动噪音、损耗等问题所采取的特殊结构措施；分析了我国超高压电网中运行的并联电抗器存在的主要问题,提出了高压并联电抗器的运行监督维护建议。     

Preparation of a sensor substrate using functionalized mesoporous silica on a gold film for surface plasmon resonance (SPR) spectroscopy

The use of surface plasmon resonance (SPR) spectroscopy has been applied to a wide variety of fields such as biosensors and surface analysis instruments. In general, a SPR substrate is prepared using self-assembled monolayer (SAM) method of organic molecules as receptor for the target on a layer of gold or silver. However, mesoporous inorganic materials such as SBA-15 have benefits as sensor substrate for SPR. Mesoporous silica has a large surface area which receptor molecule can be attached and has a rigid body which has an excellent stability in the extreme condition compared to organic sensing layer. We prepared an organic modified mesoporous silica and successfully immobilized it on a gold surface, in an attempt to use as a substrate for SPR spectroscopy. For the comparison of sensitivity of prepared substrate, Pt²⁺ detection was selected as a model system. Substrate prepared in this study exhibited the capability of selective sensing for Pt²⁺ ions.     

Preparation of SnO2 whiskers via the decomposition of tin oxalate

A new method for preparing SnO₂ whiskers by the decomposition of SnC₂O₄ is suggested. A Whisker-like morphology of a SnC₂O₄ precipitate was attained via the gradual addition of an oxalic acid solution to a hot SnCl₂ aqueous solution (T > 50^∘C). In comparison, when the solution temperature was either lower than 50^∘C or when ethanol was used as the solvent, the SnC₂O₄ precipitate showed an angular and relatively isotropic morphology. The morphology of the SnC₂O₄ precipitate remained even after its thermal decomposition into SnO₂ at 400^∘C indicating that SnC₂O₄ precipitation is a key step in preparing the whiskers. The formation mechanism of SnO₂ whiskers was explained by the supersaturation during the precipitation of SnC₂O₄.     

民营二级学院数学教学探微

对现阶段我国民营二级学院数学课程的设置进行了介绍,讨论了民营二级学院数学课程的新定位、内涵以及应该予以重视的几个问题.