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非碳纳米管研究的新进展 总被引:4,自引:0,他引:4
文章系统地论述了非碳纳米管的制备,较详尽地介绍了多种非碳纳米管制备最新的进展,包括硫化物、氮化物、氧化物等等,特别重点地总结了非碳纳米管前沿材料,例如WS2,Bi2S,,ZnS,GaN,BN,AlN,InP,Eu2O3,,V2O3等.最后对非碳纳米管的研究趋势作了展望. 相似文献
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人到老年,经常回忆起往事,岁月流逝,世事纷繁,绝大部分经历过的事情都已逐渐淡去,甚至烟消云散了,只留下一些对自己来说印象最深、影响最大的人和事,我从大学毕业以后,一直从事科研工作.工作单位虽然变化不多,却遇到了不少老师、同事和朋友,得到了他们的很多鼓励、指点和帮助,对此我都记忆犹新,往事历历在目,我一直从内心深处感谢他们。在他们当中,于敏同志是对我帮助最大、影响最深的人之一,是我的良师益友.大学毕业后,刚走向社会,我就认识了于敏同志,随后我们又长期为了一个共同目标,有了相当频繁的交往,一起讨论工作,这是我一生中有幸碰到的“机遇”之一。 相似文献
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人类处在天地之间,每日目睹昼夜更替,每年经历寒暑变迁。"日居月诸,照临下土"。人类在阳光下生活、生存,与生具备的亘古不变的好奇心,也一直激励人们关心周围的自然现象,"日月安属?列星何陈?"几千年来,人类历经世代更迭,观念更新,从以地球为中心的地心说到以太阳为中心的日心说,直至1609年伽利略开始使用望远镜观测太阳黑子,人类对太阳逐渐有了正确的科学了解。到国际天文学联合会(IAU)成立的1919年为止,人们已经发现了太阳光谱中的大量谱线(Fraunhofer,1814);发现了太阳黑子的蝴蝶图分布及其11年活动周期(Schwabe,1843);发现了剧烈的太阳耀斑活动(Carrington,1859);通过日食期间的太阳光谱观测,发现了一种新元素:氦(Secchi,1868),次年又发现了一条与众不同的谱线,它与当时所有已知元素的谱线都不吻合,以为是发现了另一种新元素;此外,还发现了太阳黑子具有强磁场(Hale,1908),这是人类首次在地球以外的天体上发现磁场。这些工作为太阳物理以及天体物理的发展奠定了重要基础。 相似文献
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提出了一种用于高功率微波武器的等离子体通道天线(PCA),计算了该天线的辐射方向图。推导出了一般性天线的辐射方向函数;建立了PCA的近似电磁模型;给出了圆坐标系下PCA和周围空气中的电磁场,利用边界条件得出了PCA的色散方程,求出PCA的表面波波矢。重点讨论了PCA的辐射场随等离子体密度、天线长度、半径的变化,证实了PCA方向图的可控性。 相似文献
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提出了一种用于高功率微波武器的等离子体通道天线(PCA),计算了该天线的辐射方向图。推导出了一般性天线的辐射方向函数;建立了PCA的近似电磁模型;给出了圆坐标系下PCA和周围空气中的电磁场,利用边界条件得出了PCA的色散方程,求出PCA的表面波波矢。重点讨论了PCA的辐射场随等离子体密度、天线长度、半径的变化,证实了PCA方向图的可控性。 相似文献
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Yoshiaki Hattori Shinobu Mukasa Hiromichi Toyota Shinfuku Nomura 《Current Applied Physics》2013,13(6):1050-1054
The electrical breakdown of microwave plasma in water was investigated between 1 and 30 kPa. The dependency of the ignition power for generating plasma on the size of coaxial electrode was measured. The ignition power decreases with a decrease of the diameter of the inner electrode. The behavior of microwave plasma in water was observed using a high-speed camera. The plasma ignites in a bubble generated by microwave heating. The model for calculating the electric field was created on the basis of the captured images of the bubble just before plasma ignition. The method presented can be used to visualize the electrical field distribution in the bubble. The electric field breakdown was calculated using the measured ignition power. The electric field breakdown of plasma in water is of the same order as gas phase plasma. 相似文献
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M. I. Ryazanov A. A. Tishchenko 《Journal of Experimental and Theoretical Physics》2006,103(4):539-545
The dielectric properties of a quasi-two-dimensional molecular monolayer are analyzed. The dielectric function of the monolayer is expressed in terms of molecular polarizability and monolayer characteristics. The expression is analogous to the well-known Clausius-Mossotti equation for three-dimensional systems. The response of the monolayer to an external field is calculated. The case of a planar array of nanoparticles is also considered. The solution is obtained in the framework of a local-field theory. 相似文献
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Antonio Zecca 《International Journal of Theoretical Physics》2000,39(2):377-387
The massless field equations for arbitrary spin in curved space-time arereconsidered. The general solution of the field equation in Robertson-Walkerspace-time that was previously determined is briefly discussed after explicitlyshowing that the Weyl spinor vanishes. The case of the Lemaître-Tolman-Bondispace-time is studied in detail. The general expression of the corresponding Weylspinor is obtained and some particular situations exploited. The spin-3/2 andspin-2 massless field equations are solved explicitly. The solutions are simplifiedby the existence of nontrivial algebraic constraints. The angular part of theequations is separated by the usual separation method and integrated directly.The other equations that are not separated in the radial and time dependence arereduced to a simple form. The results obtained are extended, as a consequenceof previous results, to the case of arbitrary spin. The solution of the general caseessentially reduces to the treatment of spin 3/2 and spin 2. 相似文献
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The mathematical model for a racetrack microtron with an output energy of 50 MeV is described. The number of orbits is five.
The increment of energy beam increase is 10 MeV per turn. The frequency rate of acceleration is four. One feature of the accelerator
is injection directly into the acceleration section with a rather low kinetic energy beam of 0.8–1 MeV. The parameters that
affect the capture region in the acceleration mode are determined. The region of capture is calculated. The basic properties
of the focusing system are studied. The conditions for the optimum passage of the beam are substantiated for all orbits. 相似文献
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不同季节的虎杖根茎中8种矿质元素的光谱测定 总被引:4,自引:2,他引:2
采用空气-乙炔火焰原子吸收法,测定虎杖根茎的K,Ca,Na,Mg,Fe,zn,Mn,Cu等8种矿质元素的含量。对测定条件进行了实验,选择了最佳电离抑制剂和酸性介质。实验以氯化铯为电离抑制剂,盐酸浓度控制在2%以内,用氯化锶消除磷对Ca的干扰,使吸光值稳定,用标准曲线法进行测定,获得了满意效果。该方法简单、快速、准确,加标回收率为90.5%~108.2%,相对偏差为0.3%~0.7%,适合于植物矿质元素的分析。实验结果表明:虎杖根茎中含有丰富的矿质元素,其中以K,Ca元素含量最高。这与虎杖的药用效果相符。同时,每种元素含量随季节变化而变化,与其生长发育密切相关。 相似文献