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721.
YANG Baohua WANG Yang HUANG Yuanhe 《科学通报(英文版)》2006,51(1):25-30
Discovery of carbon nanotubes (CNTs) has attracted considerable attention in the scientific community due to their unique structures and properties. Chemical doping can further modify the electrical properties of CNT. The empty space inside CNT provides t… 相似文献
722.
WANG Danghui YANG Yixin YANG Yiqin ZHAO Tiancheng WU Xing WANG Shaokang HOU Yao CHEN Weizong 《科学通报(英文版)》2006,51(7):785-790
Abstract The 2-acetyl-benzimidazoledehyde-glycine Schiff-base ligand and the corresponding Pr(Ⅲ) complex Pr2L3(NO3)3· 2CH3OH (L=C11H10N3O2) were synthesized in methanol and characterized by a series of methods, including chemical analysis, elemental analysis, TOF-MS, ^1H NMR, UV-, IR-, Raman spectra, thermal analysis, and the three-dimension fluorescence excitation and emission spectra. The Pr(Ⅲ) complex exhibits extraordinary water-solubility and the Pr(Ⅲ) hydroxide appears at pH≥13. The complex also possesses specific fluorescent properties. Thus, at the excitation wavelengths 200.0-280.0 and 260-350 nm the fluorescence bands were observed at 290.0 and 400.0 nm, respectively. 相似文献
723.
724.
RAO Wenbo YANG Jiedong CHEN Jun LI Gaojun 《科学通报(英文版)》2006,51(12):1404-1412
Strontium (Sr) is a divalent alkaline earth element. Its ionic radius (0.113 nm) is slightly larger than that of calcium (0.099 nm), and Sr thus substitutes isomor- phously for Ca in many minerals. Neodymium (Nd) is a rare earth element. Its chemical prop… 相似文献
725.
LIU Yongqin YAO Tandong KANG Shichang JIAO Nianzhi ZENG Yonghui SHI Yang LUO Tingwei JING Zhefang HUANG Shijun 《科学通报(英文版)》2006,51(12):1476-1486
Mt. Everest, the zenith of the world, plays an impor- tant role in the global climate change. During the lastdecade, some studies on glacier and snow have been undertaken in this region. The climate and environment changes in the past hundred years have b… 相似文献
726.
CHANG Qihai YANG Guotao SONG Juan GONG Shunsheng 《科学通报(英文版)》2006,51(21):2657-2661
The stability of the middle atmosphere ranging from 30 km to 60 km over Wuhan is elementarily studied, according to the observational data obtained in about one year through the WlPM Rayleigh lidar. The stability parameter (buoyancy frequency squared), which was obtained through the temperature field, shows that the middle atmosphere over Wuhan is stable all the year round, but the stability appears variable because the stability of summer and winter is lower, and that of spring and autumn is higher. 相似文献
727.
CHEN Zhen YANG Juekuan ZHUANG Ping CHEN Minhua ZHU Jian CHEN Yunfei 《科学通报(英文版)》2006,51(23):2931-2936
The thermal conductivities of InGaAs/ InGaAsP superlattices with different period lengths were measured from 100 to 320 K using 3ω method. In this temperature range, the thermal conductivities were found to decrease with an increase in temperature. For the period length-dependant thermal conductivity, the minimum value does exist at a certain period length, which demonstrates that at a short period length, superlattice thermal conductivity increases with a decrease in the period length. When the period is longer than a certain period length, the interface thermal resistance dominates in phonon transport. The experimental and theoretical results confirmed the previous predictions from the lattice dynamics analysis, i.e. with the increase in period length, the dominant mechanisms of phonon transport in superlattices will shift from wave mode to particle mode. This is crucial for the cutoff of the phonons and lays a sound foundation for the design of superlattice structures. 相似文献
728.
Growth ages of ferromanganese crusts from the western and central Pacific: Comparison between nannofossil analysis and ^10Be dating 总被引:3,自引:0,他引:3
CHENG Zhenbo SHI Xuefa WU Yonghua SU Xin LI Xiaoyan WANG Kunshan YANG Yongliang GE Shulan JU Xiaohua SHI Fengdeng M. Hiroyuki 《科学通报(英文版)》2006,51(24):3035-3040
Based on results of nannofossil analysis and 10Be dating in ferromanganese crusts M1-1 and A1-1 (no nannofossils were found in it),from the western and central Pacific respectively,it is found that the crust growth ages from nannofossil biostrati-graphy agree well with those based on 10Be isotope analysis. Both crusts have three growth layers,and the oldest layer was deposited in Miocene at about 12.80 Ma. The maximum,minimum,and average growth rates of crust A1-1 (from the central Pacific) are 8.11,1.92 and 3.47 mm/Ma,and those of crust M1-1 (from the western Pacific) are 2.93,0.47,and 0.94 mm/Ma. 相似文献
729.
本书是施普林格出版社2005年出版的一本关于螺旋压缩机的新著。螺旋式压缩机是一种最常见的用于压缩气体的机器,由于其构造简单、工作效率高而受到人们的关注。本书系统阐述了螺旋压缩机的种类、几何参数转子的设计工作原理和螺旋压缩机的计算。 相似文献
730.
B.布沙 《国外科技新书评介》2006,(7):10-10
“纳米材料”是指在纳米尺度(0.1~100nm范围,1nm=10^-9m)上研究物质的特征和相互作用,以及利用纳米尺度的特征开发新产品的一门科学和技术。纳米科技包含纳米材料、纳米器件和对它们的检测与表征等应用性很强的研究和技术领域。通常说的纳米检测和表征是指在纳米尺度上分析纳米结构材料和器件的组成、构造,并且进一步探索新现象,作为发展新的器件和功能材料的手段。 相似文献