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%.     

高Tc超导薄膜红外（光）探测器的研究

系统地报道了近年来关于高Ｔｃ超导薄膜红外（光）探测器的研究成果，先后进行了单元分立器件、２×２、２×４集成式阵列器件以及约瑟夫逊结型红外（光）探测器的研究。器件经过１０多次的液氮温度至室温的冷热循环，并在室温下保存两年以上，所得测量结果基本不变。采用具有约瑟夫逊效应的高Ｔｃ超导双晶晶界结的光探测器具有量子效应，其响应速度快于６．３５×１０－７ｓ。     

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。     

Stratigraphic implications of Sinian-Early Cambrian volcanic ash beds on the Yangtze Platform

Volcanic ash beds from shallow- to deep-water facies strata of the Sinian-Early Cambrian (Meishucunian) on the Yangtze Platform consist of bentonites and tuffites which are readily recognized in the field by their physical features and confirmed by geochemical analyses.Geochemistry suggests that the volcanic ash beds in Meishucunian time are rhyolite and rhyodacite while those in the Qiongzhusian and Sinian are andesite and trachyandesite.The ash beds in the time-equivalent strata, even in different areas display rather similar geochemical features, whereas the ash beds in different strata even in the same areas show large chemical difference.The results suggest that these ash beds can be used for intra- and extra-basinal correlations of the Sinian-Early Cambrian interval on the Yangtze Platform.Additionally, these ash beds suggest high potentials for further U-Pb dating strategies.     

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.     

基于FY-3的海南岛橡胶NDVI时空变化规律研究

为了研究海南橡胶的生长态势,分析橡胶的归一化植被指数的变化规律,选取海南岛2008—2011年的FY-3A MERSI遥感进行去噪处理,运用风云三号遥感系统和ENVI得到相关数据,将遥感数据结合最大合成法分析橡胶的空间分布特征、年内及年际变化规律,得到海南岛橡胶年生长周期及变化规律.结论表明在2009—2012年四年间海南岛90%以上的橡胶NDVI值均保持在0.6以上,平均值呈现日益增加的趋势,每年2月和8月为极小值和极大值,2—8月为增长趋势,8—10月为下降趋势,10—11月有小幅度的增长,11月至次年2月呈下降趋势.     

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.