谐振子的辛欧拉分析方法

针对理想简谐振子力学模型,研究了其守恒律,并利用辛欧拉格式分析简谐振子振动过程.首先给出了谐振子系统的平方守恒律、周期守恒律和相差守恒律.构造了谐振子的普通欧拉格式和辛欧拉格式,研究了两种格式下三种守恒律各自的保持情况.模拟结果显示:辛欧拉格式能够精确保持时域守恒律(平方守恒律),但无法保持频域守恒律(周期守恒律和相差守恒律).如要克服辛欧拉格式的不足,需按邢誉峰教授提出的方法进行校正.     

基于EAserver的多层分布式Web技术的企业MIS系统解决方案

针对传统C／S模式中存在的缺点，提出了采用基于数据窗口技术和Jaguar组件技术的多层分式Web技术来构建现代企业之间安全、高效的信息管理平台的方案。该技术为企业开发基于中间件的分布式Web应用奠定了坚实的基础。     

基于圆形窗口的简单多边形裁剪算法

提出了一种新颖而实用的圆形窗口Ｖ对多边形Ｐ的裁剪算法。它将多边形Ｐ的边视为有向线段，通过引入多边形顶点的入边和出边交点的概念，深入研究了Ｐ被Ｖ裁剪后的区域确定问题，给出了作出Ｐ在Ｖ内部分的定理     

圆与多边形重叠区域的判定算法

本文提出了一种实用的圆与多边形重叠区域的判定算法，它集判断与确定功能于一体。该算法将多边形的边视为有向线段，通过引入多边形顶点的入边，出边交点的概念，研究了圆与多边形重叠区域的确定问题，并给出了作出其重叠区域的定理。     

Release properties of cinnamaldehyde loaded by montmorillonite in chitosan-based antibacterial food packaging

This work aimed to prepare a controlled-release antibacterial food packaging film by solvent volatilisation using chitosan (CS) and acidified modified montmorillonite (MMt) loaded with CIN (acid-MMt-CIN). MMt was successfully acidified and CIN was successfully loaded into acid-MMt, which had been confirmed by X-ray diffraction. The coordination of acid-MMt-CIN significantly increased the barrier properties of CS film to water vapour, as well as the rigidity and ductility of the film. Furthermore, the CS/acid-MMt-CIN film could significantly improve their UV resistance. It was found that the CIN release time of CS/acid-MMt-CIN film in isooctane (simulated fatty food) could reach 168 h, which was 72 h longer than that of CS/CIN film. The addition of acid-MMt-CIN had a significant inhibitory effect on Staphylococcus aureus and Escherichia coli. In short, CS/acid-MMt-CIN film could potentially be used as an antibacterial active food packaging film.     

镍基高温合金GH202高温氧化后的微观组织演变

研究了镍基高温合金GH202在800~1100 ℃高温氧化后晶粒、碳化物和强化相的演变过程。采用透射电子显微镜、扫描电子显微镜和电子背散射衍射对其微观结构进行了表征。结果表明：镍基高温合金的硬度随氧化温度的升高而降低,1100 ℃氧化100 h后,硬度降低了43.5%。800和900 ℃氧化后晶粒生长速度较慢,而经900 ℃氧化后晶界碳化物析出显著增加。在1000和1100 ℃氧化后,晶粒尺寸明显增大。氧化过程中晶界迁移是由晶界两侧自由能差决定,温度越高,晶界向曲率中心迁移越快,大量细小晶粒被吞并形成了大晶粒。大块状碳化物（MC）分解成大量的碳原子,与Cr原子结合形成少量的富Cr颗粒状M₂₃C₆。在900 ℃氧化150 h后,M₂₃C₆演化为富Ti的M₆C。随着氧化温度的升高,碳化物在γ相中回熔。在800、900和1000 ℃氧化后,γ′相逐渐长大,在1100 ℃氧化100 h后,完全溶解于γ相。     

超支化季铵盐诱导制备树枝状纳米纤维膜及其性能

为开发具有高效过滤性能的膜材料,以超支化季铵盐(HBP-HTC)为枝化促进剂,利用静电纺丝技术一步法制备了聚偏氟乙烯(PVDF)树枝状纳米纤维膜,探讨了纺丝工艺对纤维膜成形结构的影响,分析了树枝状纳米纤维膜的力学性能及其空气过滤性能。结果表明：由于HBP-HTC表面丰富的季铵基团具有对电荷的稳定富集作用,可获得比用小分子季铵盐制成膜更多的树枝状纳米纤维结构,当PVDF质量分数为12%,季铵基团添加量为0.10 mol/L,纺丝电压为25 kV时,制得的纤维膜树枝状覆盖率高达78.32%,且具有较好的力学性能;所制备的纳米纤维膜厚度为40μm时,其过滤效率高达99.995%,而压降为122.4 Pa。     

Synthesis of an amino-terminated hyperbranched polymer and its application in reactive dyeing on cotton as a salt-free dyeing auxiliary

A water-soluble amino-terminated hyperbranched polymer was synthesised from methyl acrylate and diethylene triamine by melt polycondensation. Its molecular weight and possible structure were characterised by gel permeation chromatography, Fourier transform infrared spectrophotometry and nuclear magnetic resonance spectroscopy. The zeta potential of cotton fabrics treated with the aqueous solution of the amino-terminated hyperbranched polymer (6 g dm⁻³) in the presence of citric acid (2 g dm⁻³) and sodium hypophosphite (3 g dm⁻³) of the liquid phase is positive at pHs lower than 7.5. Dyed with reactive dyes, the treated cotton fabric displayed a markedly enhanced colour strength, even when dyeing had been carried out in the absence of the electrolyte. The washing fastness, rubbing fastness and levelling properties of the dyed, treated cotton fabrics were also good compared with that obtained by conventional dyeing. The dyeing behaviour of Reactive Brilliant Yellow A-4GLN on treated cotton fabric was examined and found to follow a Langmuir-type adsorption curve. It is concluded that the amino-terminated hyperbranched polymer can be used as a salt-free auxiliary in reactive dyeing on cotton.     

多氨基化合物(RSD)接枝改性竹浆纤维的性能研究

利用实验室自制的多氨基化合物(RSD)对竹浆纤维进行接枝改性,测试分析了改性前后竹浆纤维的染色、抗菌、抗紫外性能的变化.结果表明:RSD改性竹浆纤维无盐染色与未改性竹浆纤维常规染色相比,K/S值、染料上染性均提高,可以实现无盐染色,并对染料具有广泛的适用性;当RSD质量浓度达到4 g/L时,改性后竹浆纤维具有较好的抗菌及抗菌耐洗性,抑菌率均达到88%以上.此外,织物UPF值由8.53上升到19.28,抗紫外性能明显提高.     

采用经济型数控机床加工车轮

针对车辆制造厂家需要小批量、技术要求高的车轮的实际情况，提出了在经济型数控机床上加工车轮的设想，设计了新的、合理的加工工艺流程及专用工装夹具和刀具，并编制NC加工控制程序，加工出了符合图纸技术要求的合格车轮。