一种对等网络的通信分析与实时应用

讨论了ＮｏｖｅｌＤｏｓ７点对点对等网络的特点，对网络中各站点通信速率进行了估算，结果表明Ｎｏｖ－ｅｌＤｏｓ７特别适合中、小型实时局域网系统．介绍了该对等网络的一个实时应用——县级中、小型电网调度自动化系统，该系统的设计和开发兼顾了低成本和满足用户基本需求这两个基本因素，使系统具有良好的性能价格比，具有工作可靠、配置灵活、使用方便等特点．     

乳状液膜法直接生产单质金的研究

以磷酸三丁酯(TBP)为流动载体,硫酸肼为内水相还原反萃剂,采用乳状液膜法从含金的盐酸溶液中直接生产黑色粉末单质金,同时对影响金迁移率和内水相还原率的各种因素进行了研究.通过正交实验确定了最佳操作条件,金的迁移率为98.9%.     

Cohen-Grossberg神经网络的指数稳定性

研究了Cohen-Grossberg神经网络模型的指数稳定性．运用非线性测度方法证明了神经网络平衡点的存在性和惟一性，接着通过构造一个新颖的Lyapunov泛函，得到了神经网络指数稳定的全新充分条件，并给出了解的指数衰减的精确估计．与已有文献相比，文中给出的条件更为宽松且易于验证．     

Efficient structures for wideband digital receiver

1 .INTRODUCTIONWith the development of high perfor mance ana-logue-to-digital converters ( ADC) , applicationspecific integrated circuit ( ASIC) devices anddigital signal processing ( DSP) technology , dig-ital receiver has increasingly become popular inrecent years[1 ~7]. The digital receiver is a typi-cal application of software radio in radar . Itsmain purpose is to move the digital conversionprocess closer to the antenna and execute mainfunctions on general hardware . But the sign…     

肿瘤热疗用Fe3O4磁性纳米粒子的生物相容性研究

研究用于肿瘤热疗的自制Fe3O4磁性纳米粒子的生物相容性.采用MTT试验评价其浸提液体外细胞毒性;溶血试验评价其有无溶血作用;小鼠腹腔注射Fe3O4磁性纳米粒子无菌生理盐水混悬液以测定其LD50;微核试验评价其有无致畸、致突变作用等.MTT结果显示该材料对L-929细胞毒性为0~1级,均属对细胞无毒性范畴;溶血试验中Fe3O4磁性纳米粒子的溶血率为0.514%,远小于5%,表明实验用Fe3O4磁性纳米粒子无溶血作用;昆明小鼠腹腔注射该材料混悬液,其LD50为7.57g/kg体重,其95%的可信区间为6.18~9.27g/kg体重,属实际无毒范畴,且具有较广的安全值范围.微核试验结果表明该材料对小鼠骨髓微核形成率与阴性对照组相比无显著差异,而与阳性对照CTX组相比有显著差异,可以认为该材料无致畸或致突变作用.从实验目前的研究结果来看,自制的Fe3O4磁性纳米粒子具有良好的生物相容性,在肿瘤磁流体热疗方面具有良好的应用前景.     

航空运输可持续发展理论的分析和应用

针对航空运输的可持续发展问题进行了分析 ,讨论了航空运输发展的可持续现象 ,强调建设可持续发展的航空运输必须转变思想 ,平衡航空资源、社会需求和航空运输经济利益的关系 ,避免短期行为 ;经营上保持创新的活力 ,以有限的资源支持更大的航空运输需求。     

Liquidity dynamics around intraday price jumps in Chinese stock market

Using 4128 single jumps detected from high frequency data of 220 individual stocks in SZ300P index, this paper investigates the liquidity dynamics around price jumps in Chinese market. Some interesting empirical results are obtained and the corresponding explanations are given. The frequency of positive jumps is quite higher than that of negative jumps. The trading volumes and average trade sizes are all in a high level around positive jumps. The relatively low liquidities around negative jumps show that negative jumps may be generated and enlarged by poor liquidity provision. The price reversal after price jumps is significant, and price reversal lasts longer after positive jumps. Moreover, the size and direction of jumps are significantly correlated with the returns and trades in the post-jump trading time. These findings are believed to be associated with the high proportion of retail investors and their herding behavior for price trend chasing.     

High-performance flexural fatigue of carbon nanotube yarns

Carbon nanotube yarns （CNTY） possess good specific strength and specific conductivity. As such, their potential for commercial applications is significant. Fatigue performance is a significant consideration in yarn/wire applications. In this study, the flexural fatigue performance of CNTY spun from super-aligned carbon nanotube arrays was investigated using a reversed bending test. The results showed that CNTY exhibited excellent resistance to pure flexural fatigue, significantly outperforming stainless steel wire; CNTY failed where a combination of flexural fatigue and tension-tension fatigue had special hollow fracture morphology, and CNTY resistance remained fundamentally unchanged in the combination fatigue process.     

基于动态阈值的混凝土裂缝高抗噪提取及识别方法

针对表面布有蜂窝麻面等复杂噪声的混凝土裂缝,提出了一种基于动态阈值的混凝土裂缝高抗噪提取方法.首先,通过灰度变换、高斯滤波、信息增强等技术弱化、去除噪声,增强图像中裂缝的亮度,提高裂缝与背景的对比度;然后,采用OTSU阈值分割算法去除伪裂缝,基于裂缝与干扰噪声面积的差异,引入动态阈值,实现各类型裂缝的提取;最后,基于边缘检测和裂缝骨架细化处理,计算裂缝的长度、宽度和面积3项特征参数.基于室内实验和室外实际桥梁拍摄的4组裂缝图像结果表明,4组裂缝的平均宽度分别为2.01、1.07、1.34、0.97 mm,说明该方法适用于不同背景下各类型裂缝的提取,具有较强的鲁棒性.     

高效数字化测图方法——拼音简码法

拼音简码法是编码测图的一个分支，是在外业采集细部点时，采用点名拼音简码形式快速记录点位的信息属性，单位时间测绘效率是全野外采点绘制草图法的1．5倍。介绍了拼音简码法的操作方法，并与传统誊集方法做了比较。