电力变压器温升与冷却装置改造的技术经济分析

通过分析电力变压器对散热和温升的控制要求,结合一台变压器的冷却装置更换改造实例,对新旧冷却装置降低电力变压器温升,提高负载能力,节约电能损耗等进行技术经济的对比分析。     

一种基于神经网络和系统调用的异常入侵检测方法

提出了一种利用多层BP神经网络建立进程正常运行轮廓的思想,基于1998年DARPA入侵检测系统评估的审计数据源,通过与K近邻分类、带(频率)门限的Stide(TStide)算法的性能比较表明,所提出的算法具有较高的检测率,同时维持了一个较低的误警率。     

紧支撑二维小波多尺度融合图像效果评价

针对图像融合的效果评价标准以及小波函数选择等热点研究问题,丈中采用了紧支撑二维小波db3对图像进行了多尺度分解及重构的融合研究,并且通过亮度参数、细节参数和光谱信息参数等对融合尺度不同的图像进行了客观质量评价。实验证明,经过该方法融合后的图像能把源图像各自具有的信息融合在一起,亮度适中、信息熵增加、清晰度提高。理论分析结果、融合图像的视觉效果与所采用的客观质量评价标准的数值分析结果是相一致的,表明了该方法客观而有效。     

Green Synthesis,Characterization, and Properties of Acyl Lysine,Serine, Threonine,and Methionine Derived from Three Types of Natural Oils

The development of environmentally benign products has been the subject of growing interest in the field of surfactant chemistry. Acyl amino acid surfactants bearing lysine, serine, threonine, and methionine residues were synthesized using natural oils extracted from coconut, palm kernel, and soybean as acyl donors. The chemical structures were confirmed by high-performance liquid chromatography (HPLC/MS) and infrared (IR) spectra. Their surface activities, ion-specific effects, detergency, and foam properties were studied systematically. The critical micelle concentration (CMC) values depend significantly on amino acid and oil types and follow the orders: (i) Lys > Thr ≈ Ser > Met and (ii) Coconut ≈ Palm kernel > Soybean oil. Interestingly, the ion-specific effects showing that the γ_CMC value decreases with increasing counterion size and hydrophobicity were observed, and the results were consistent with the famous Hofmeister series. The detergency ability of acyl amino acid surfactants is better than multiple traditional surfactants in distilled water. Although the detergency ability of our products for oil-soiled swatches decreased significantly in hard water, this problem was solved by the C-Lys-Na/AES mixed system showing excellent synergistic effects. Excellent foamability and foam stability were achieved for acyl threonine and serine bearing hydroxyl groups on their headgroups, suggesting that the packing of these surfactants at the air–water interface was assisted by hydrogen bonding.     

基于数据结构化的三维动画压缩方法研究

在三维动画应用日益广泛的背景下,研究三维动画数据压缩方法对其数据的存储、传播和渲染技术至关重要.基于图像数据的结构化特征,计算机视觉领域提出了一系列高效图像压缩技术.鉴于三维动画数据与图像数据结构的差异,探讨三维动画数据结构化方法,进而探索改进图像算法以实现一种新的三维动画数据压缩方法.具体而言,首先研究对三维模型顶点...     

干燥方法对木薯淀粉基碳气凝胶制备和吸附性能的影响

为研究干燥方法对淀粉基碳气凝胶的结构及吸附能力的影响,以木薯淀粉为碳源,采用常压干燥和冷冻干燥制备气凝胶,再将其高温碳化制备相应的碳气凝胶。利用红外光谱仪、X射线衍射仪、扫描电镜和全自动物理/化学吸附仪对所制备的淀粉基气凝胶和碳气凝胶进行表征,并考察了淀粉基碳气凝胶对阳离子染料的吸附能力。研究结果表明,2种干燥方法制备的淀粉基气凝胶化学结构与晶体结构基本相同,但采用冷冻干燥制备的淀粉基气凝胶（SA-FD）成孔数量更多,所对应的淀粉基碳气凝胶（SCA-FD）具有更大的比较面积（887.4 m2/g）、孔容积（0.444 cm3/g）和更强的阳离子染料吸附能力,与常压干燥法相比更具优势。     

顶空固相微萃取气质联用分析泡椒凤爪的香气成分

采用顶空固相微萃取结合气质联用分析了泡椒凤爪的挥发性香气成分,共检出21种香气成分,其中酚类6种、酸类5种、酯类4种、醛类3种、其他3种。检测到的含量较高的化合物有对丙烯基苯甲醚、乙基麦芽酚、4-乙基-愈创木酚、苯甲醛、4-乙基苯酚,水杨酸甲酯,乙酸,己醛,苯甲酸乙酯。     

辣椒红色素的分离及光稳定性研究

利用硅胶柱层析法分离辣椒红色素，得到黄色素酯和辣椒红素二酯，比较它们的光稳定性。结果表明，在光照条件下，辣椒红素二酯稳定性较高，4d后仍有50％未被降解；避光存放3个月，辣椒红素二酯最稳定，降解率不到0．5％，而混合色素的稳定性降低。     

水蒸汽蒸馏法提取橙皮精油的研究

针对影响水蒸汽蒸镏法提取橙皮精油的各重要因素,即提取时加入NaCI的浓度、提取时间、料液比(溶剂量),首先设计各因素单因素实验,然后设计正交实验进行了综合探究.结果表明:加入NaCl浓度4%,提取时间2.5h,料液比为1:2(即加水量为橙皮量的2倍)的组合是最佳工艺组合.