硅钼蓝光度法测定碳化硅中二氧化硅的含量

采用氯化钠-盐酸-氢氟酸溶解碳化硅样品,加钼酸铵使硅酸离子形成硅钼杂多酸,然后用1-氨基-2-萘酚-4-磺酸还原剂将其还原成硅钼蓝,在700nm波长处测定其吸光度,从而测得碳化硅中的二氧化硅含量。考察了称样量、水浴温度、水浴加热时间、样品储存容器、显色反应时间等因素对测定结果的影响,优化了测试条件。二氧化硅的质量浓度在0．25-12．5mg／（100mL）的范围内与吸光度呈良好的线性关系,线性相关系数r=0．99986。加标回收率为99．2％～100．9％,测定结果的相对标准偏差为0．76％（n=6）。     

光谱重置法在非局域空间光孤子研究中的应用

利用光谱重置法在数值上求解非局域非线性薛定谔方程,快速准确地计算出非局域非线性介质中空间光孤子的波形,并得到在不同非局域程度下形成孤子的临界功率和临界束宽的关系.研究结果表明,在任意非局域程度条件下都可以形成稳定的空间光孤子.在响应函数不同时分别与解析解进行对比,发现数值解和解析解只有在强非局域和弱非局域这两种极限条件下是一致的,并给出了对应解析解的有效范围.     

Modification of the spontaneous emission of quantum dots near the surface of a three-dimensional colloidal photonic crystal

This paper demonstrates experimentally and numerically that a significant modification of spontaneous emission rate can be achieved near the surface of a three-dimensional photonic crystal.In experiments,semiconductor core-shell quantum dots are intentionally confined in a thin polymer film on which a three-dimensional colloidal photonic crystal is fabricated.The spontaneous emission rate of quantum dots is characterised by conventional and time-resolved photoluminescence (PL) measurements.The modification of the spontaneous emission rate,which is reflected in the change of spectral shape and PL lifetime,is clearly observed.While an obvious increase in the PL lifetime is found at most wavelengths in the band gap,a significant reduction in the PL lifetime by one order of magnitude is observed at the short-wavelength band edge.Numerical simulation reveals a periodic modulation of spontaneous emission rate with decreasing modulation strength when an emitter is moved away from the surface of the photonic crystal.It is supported by the fact that the modification of spontaneous emission rate is not pronounced for quantum dots distributed in a thick polymer film where both enhancement and suppression are present simultaneously.This finding provides a simple and effective way for improving the performance of light emitting devices.     

新药阿德福韦酯的核磁共振研究

采用2D NMR技术对阿德福韦酯的氢谱和碳谱进行了全归属。对其结构进行确定，用于质量标准研究。     

粗煤泥回收工艺改造的研究与实践

东城洗煤厂利用现有的条件，将原来的末精筛下水和离心液的粗煤泥闭路回收系统，用旋流器和高频筛改为开路和闭路相结合的回收系统。在降低末精灰分，提高整体精煤质量和对产品结构调整起到了显作用，而且取得了较好的经济效益。     

提高计算机语言类课程教学质量探讨

本文就职业教育的课程设置、教学过程、实训方法、校企合作几个方面对提高计算机语言类课程教学质量进行了探讨。     

Non-coplanar multi-beam interference produced by one triangular pyramid for fabricating photonic crystals

A method for fabricating three-dimensional (3D) photonic crystals (PhCs) easily and simply, by using a visible light (- 532 nm) to pass one triangular pyramid to form non-coplanar multi-beam interference, named laser interference etching technique, is reported. In the experiment, we exposed a 9-μm-thick photoresist on the silicon substrate with exposure intensities of 150, 180, and 220 mJ/cm2, and produced the periodical nanostructures. Through varying a common angle in the triangular pyramid, other interference patterns can be obtained to fabricate various PhCs.     

2,5-二羟基对苯二甲酸结构与性能表征

针对目前国内外关于2,5-二羟基对苯二甲酸(DHTA)的研究报道较少,结构性能表征信息分散等现状,自制DHTA,并通过UV、FT-IR、MS、1H-NMR、13C-NMR和STA-FTIR等方法对其进行了较全面的结构与热性能表征技术研究.     

基于WEB的高校实验教学管理系统的设计与应用

教学实验是实践教学的重要组成部分,并在高等教育教学改革中受到了高度关注。阐述了高校实验教学综合管理系统开发的背景和实际意义,通过对机械类专业本科生实验教学过程的研究和分析,提出了一种适用于工科专业的基于WEB技术的的解决方案,并具体介绍了系统的结构及主要功能模块,以及系统在实际教学过程中的应用效果。     

面向应用型人才培养的理论力学改革与实践

针对理论力学课程的问题以及高层次应用型人才培养的特点,探讨了理论力学课程教学改革的必要性、可行性,然后结合教学实践,提出了一些关于理论力学课程体系、教学手段、考核方法等方面改革的思路,并在浙江科技学院2005级机械设计制造及自动化专业、材料与控制工程专业的理论力学教学中进行改革试点。