基于网管系统的分布式入侵检测模型研究

随着基于网络的服务的迅速增长,入侵检测系统的检测性能已变的越来越重要。为了提高入侵检测系统的检测率和降低其误报率,本文通过将网管系统和入侵检测系统相结合,提出了一种用于分布式入侵检测系统的层次化协作模型,提供集成化的检测、报告和响应功能。在检测引擎的实现上,使用了信息管理库(MIB)作为数据源,可有效检测流量为基础的攻击模式。应用结果表明,该模型可有效增强网络管理的安全性能,提高入侵检测系统的效率。     

基于DSP交流伺服位置控制系统的研究

提出一种基于数字信号处理器(DSP)的交流位置伺服控制系统。DSP具有的强大高速运算能力,片内集成了丰富的电机控制外围部件和电路,简化了控制电路的硬件设计,提高了系统的可靠性,并且利用DSP具有极强的数字计算能力,使很多新型的控制算法可以被用于伺服控制器中,实现了“软件化”的全数字伺服驱动器。实验结果表明了该系统具有良好的动态和静态控制特性和一定的实用性。     

基于Pro/E的ATC用平面槽凸轮自动化设计

基于逆向思维,以选定的从动件运动规律为设计目标,通过推导得出槽凸轮相关参数的关系式,并以此为依据结合Pro/E的参数化功能编写出槽凸轮摆杆滚子的中心轨迹程序,最终实现平面槽凸轮的自动化设计。     

夹心节能复合墙体破坏形态试验研究

夹心墙节能效果优越,整体性和稳定性较差,制作三组不同形式的夹心墙测试试件,通过对三组墙片进行推拉反复荷载试验,通过观察分析墙片测试完成之后的破坏形态,提出了夹心节能复合墙体前三阶段的破坏形态理论。     

铝衬套不处理胶辊的应用探讨

从铝衬套胶辊的套制和使用方面给出有借鉴意义的建议和注意事项,对使用好铝衬套不处理胶辊具有重要参考价值。     

A novel nano-sized MoS2 decorated Bi2O3 heterojunction with enhanced photocatalytic performance for methylene blue and tetracycline degradation

In this paper, MoS₂ was used as a band-suitable semiconductor to construct the Bi₂O₃/MoS₂ heterostructured photocatalysts for the first time via a deposition-hydrothermal method. The XRD, SEM and HRTEM analysis indicated that the surface of Bi₂O₃ was decorated with MoS₂ nanoparticles and Bi₂O₃/MoS₂ heterojunctions were formed. The performances on photocatalytic degradation of methylene blue (MB) and tetracycline (TC) were evaluated under visible light irradiation. The results demonstrated that the Bi₂O₃/MoS₂ heterojunctions displayed remarkably improved photocatalytic activity for both MB and TC degradation, compared to the base material (Bi₂O₃). Specifically, as the molar ratio of MoS₂ was 23.81%, the obtained Bi₂O₃/MoS₂-23.81 heterojunctions exhibited promising photocatalytic activities, and approximately 100% MB and 97% TC were degraded within 100 min, respectively. The superior photocatalytic activity was mainly attributed to its large surface area, high visible-light harvesting and the efficient separation of photogenerated electrons and holes caused by the unique heterojunction architecture. Notably, the Bi₂O₃/MoS₂ heterojunctions showed remarkable stability in recycling photocatatlytic experiments. The active species trapping and terephthalic acid (TA) fluorescence experiments indicated that the •OH was the major reactive oxidizing species for MB degradation. Furthermore, the intermediates were detected by UPLC-MS spectrometry and the possible degradation pathways for MB and TC were proposed. Finally, a possible reaction mechanism of Bi₂O₃/MoS₂ heterojunctions for the photodegradation MB was also proposed. This interesting interfacial architecture strategy will provide useful insights for designing and fabricating new class of binary heterojunctions with high-efficient photocatalytic activity towards practical application.     

荧光光谱法研究橙皮素与牛血清白蛋白的相互作用

采用荧光光谱技术研究了橙皮素与牛血清白蛋白(BSA)的相互作用.研究发现橙皮素对BSA的荧光猝灭属于静态猝灭过程,由热力学参数焓变△rHm=-60.543 kJ·mol<'-1>,熵变△rSm-114.121J-mol<'-1>均小于零,判断橙皮素与BSA之间主要靠氧键和范德华力相结合,生成自由能变(△rGm)为负值,...     

三卤化硼分子中的离域键对其性质的影响

从杂化轨道理论出发,探讨了三卤化硼分子（BX3,X=F,Cl,Br,I）中的σ共价键和离域大π键的形成,并用离域大π键解释了缺电子化合物三卤化硼的稳定性。用卤素的电负性及其三卤化硼的离域大π键这两个因素讨论了三卤化硼的Lewis酸性强弱顺序、水解及形成配合物的难易程度。     

MnZn铁氧体磁心烧结裂纹成因浅探

MnZn铁氧体磁心生产过程较复杂,裂纹是导致质量问题的重要因素。笔者针对导致烧结裂纹的各种原因进行了分析,并根据生产实践经验提出了一些解决办法。     

干压琉璃瓦的研制

介绍了利用当地原料生产干压琉璃瓦的生产工艺,并对原料的性能、釉料配方进行了研究,并在生产线上生产出合格的干压琉璃瓦产品。