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131.
LI Wenwen KONG Hao GAO Chao YAN Deyue 《科学通报(英文版)》2005,50(20):2276-2280
Poly(2-diethylaminoethyl methacrylate) (PDEAEMA)-coated multiwalled carbon nanotubes (MWNT-PDEAEMA) were successfully prepared by MWNT-surface initiated atom transfer radical polymerization (ATRP). The obtained MWNT-PDEAEMA nanocylinders have a core of MWNT and a shell of PDEAEMA and this core-shell structure was confirmed by TEM observations. The UV-Vis and AFM measurements showed that the MWNT-PDEAEMA exhibited obvious pH sensitivity. The solubility of PDEAEMA-coated MWNT dramatically decreased when pH increased to ca. 7.0. Because of the giant molecular weight of the molecular hybrids and local high density of polymeric grafts linked onto MWNTs, the resulting MWNT-PDEAEMA nanocomposites are easier to aggregate, or more sensitive to pH, as compared with the neat PDEAEMA. 相似文献
132.
133.
金属电磁带隙波导特性分析 总被引:2,自引:0,他引:2
利用有限差分(FDTD)法分析了两维金属电磁带隙(EBG)波导带隙、耦合频率和模场分布,确定了EBG结构参数和对应的频率范围;利用HFSS建立了金属电磁带隙结构分析模型,设计了带有矩形波导转换的EBG波导.基于HFSS分析该波导,得到了这两种结构的传输谱线,对比说明矩形波导接口适用于窄带应用,而圆形波导接口适用于宽带应用.实验测试结果与数值分析符合较好. 相似文献
134.
135.
滞回恢复力模型中求折点的一种方法 总被引:3,自引:0,他引:3
对于在循环往复荷载作用下,结构具有滞回特性的力学与变形关系曲线的简化折线型恢复力模型提出了一种求刚度突变点,即折点的处理方法。推导出应用Wilson-θ法及Newmark-β法求解结构动力反应时折线型恢复力模型中的加载点和卸霸占为这两类折点的计算公式。该公式以结构动力方程为基础,计算折点时刻仅涉及结构的t时刻的动力特性,位移,速度及加速度反应,折点处结构位移值等已知量,计算中避免迭代,能得出较准确的折点出现时刻,且公式形式统一,便于计算机编程。 相似文献
136.
An ammonia leaching process was utilized to extract Co, Ni and Cu from oceanic polymetallic nodules, whereas an acid leaching
process was utilized to extract Co, Ni, Cu, Zn and Mn from cobalt-rich crusts. Both processes produced nanometer materials—ammonia
leaching residue and acid leaching residue. A systematic study was conducted on the phase, composition and physicochemistry
properties of these residues. The result shows that both residues contain a large amount of nanometer minerals. Ammonia l
eaching residue mainly consists of rhodochrosite, with the average grain diameter of 17.9 nm; whereas the acid leaching residue
mainly consists of well-developed bassanite, with the average grain deameter of 9.5 nm. The bassanite also has a microporous
structure, the volume of the pore space is 1.23 × 10−2 mL/g. Both the ammonia and acid leaching residues have a large specific surface area, and they display a strong adsorption
capacity to saturate sodium chloride vapour, N2 and SO2. Both residues have high contents of rare earth elements, and most of these elements exist in the state of ionic adsorption.
The content of σ FeO is high. The P2O5 enrichment is observable in acid leaching residues. The unique composition and nanometer solid properties of the leaching
residues displayed their potential value and promised a bright future for their application in the field of environmental
protection and materials. 相似文献
137.
Generally, the non-equilibrium plasma is produced at low pressure by a glow discharge (1.33 Pa—1.33 kPa) including the radio frequency (13.56 MHz), microwave (2450 MHz), AC or DC high voltage discharges. As a method to directly apply energy to a reaction system, some successful applications have been obtained in the fields such as chemical synthesis and decomposition at plasma, sputtering and filming, deposition at the gas state, polymerization, modification on the material surface, etching, ashing at low temperature and so on. For example, in 1999, Zhang et al.[1] got a high conversion rate of 98.2% for CH4 synthesis by a glow discharge at the condition of 850℃ with the catalyst of Ni/a-Al2O3. In 1990, Matsumoto et al.[2] reduced the concentration of CO2 from 10% to 8% by DC corona torch discharge with Ar catalyst at 0.08 kPa. In 1988, Boenig et al.[3] synthesized rare N2H4 and H2O2 with a glow discharge, in which N2H4 is a kind of pureness fuel and propellant of rocket. Tanaka et al.[4] investigated the synthesis of ammonia from nitrogen-hydrogen plasmas in radiofrequency and microwave discharges with catalysts of iron and molybdenum wires of 100 pieces at 620 K and 650 Pa. After 2-h synthesis, the amounts of synthesized NH3 and N2H4 were only 1.5 mmol/g and 2.5 mol/g, respectively. Because it is only at low pressure that electrons can obtain enough energy to carry out chemical reaction, the vacuum system is necessary, which results in the complicated technology and low production efficiency....... 相似文献
138.
The present investigation showed that the additions of Ca to the alloy AZ91 were mainly dissolved into the Mg17Al12 phase and increased its melting point and thermal stability, which would have great effects on the high- temperature properties of AZ91 alloy. The empirical electron theory (EET) of solid and molecules was used to calculate the valence electron structures (VES) of Mg17Al12 intermetallic compound with and without Ca addition. The results showed that Ca dissolving in Mg17Al12 phase increased the strength of bonds that control the thermal stability of Mg17Al12 phase. Additions of Ca also made the distribution of the valence electrons on the dominant bond network more uniform in the whole unit cell of Mg17Al12. The theoretical conclusions well account for the experimental results. 相似文献
139.
Peng Wu Guojun Deng Sailong Xu Qinghua Fan Lijun Wan Chen Wang Chunli Bai 《科学通报(英文版)》2002,47(18):1514-1517
The self-assemblies of 4-hexadecyloxybenzoic acid and 3,4,5-trihexadecyloxybenzoic acid have been studied by using scanning tunneling microscopy (STM). The well-ordered assemblies with different arrangement have been investigated. The structural change is attributed to the different number of substituted alkyl chains on periphery. 相似文献
140.
利用分式线性概率母函数的特性 ,借助对偶过程及其函数变换 ,在作了一些适当的特殊假设的情况下 ,探讨了随机环境分枝过程 BPRE的灭绝概率的具体表示形式 ;并通过两个举例 ,构作了两类独立同分布随机环境分枝过程灭绝概率的积分表示。从而在特殊情况下 ,可通过简单的积分计算求得随机环境分枝过程的灭绝概率。 相似文献