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171.
M.?Wessendorf C.?Wiemann M.?BauerEmail author M.?Aeschlimann M.A.?Schneider H.?Brune K.?Kern 《Applied Physics A: Materials Science & Processing》2004,78(2):183-188
We investigated the electronic structure of epitaxially grown silver films on Cu(111) with and without adsorption of cesium by means of scanning tunneling spectroscopy and two-photon photoemission. This system has been chosen as a model system to engineer and measure the dynamics of charge-transfer processes between an adsorbate and a heterogeneous substrate. Special emphasis has been laid on the investigation of the energy shift of the Shockley-type surface state and an excited cesium resonance as a function of Ag film thickness. For the cesium resonance we observe an increase in line width with increasing layer thickness. PACS 68.37.Ef; 68.43.-h; 68.55.Jk; 73.20.-r 相似文献
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173.
An undergraduate laboratory exercise to be used in an undergraduate instrumental methods course is presented for the electrochemical characterization of oxidation products of adrenaline. An objective of this experiment is to use information obtained through cyclic voltammetry and simulation software to develop a qualitative understanding of the oxidation mechanism of adrenaline. 相似文献
174.
Magnetic hyperfine fields (mhf) acting on Ta at the Ti and Zr sites have been measured in Heusler alloys Co2TiAl(Ga,Sn) and Co2ZrAl(Sn) by the TDPAC technique utilizing the 133–482 keV gamma cascade in181Hf. Curie temperatures of all the alloys have also been measured using a vibrating sample magnetometer. Present data together with the existing results on the Co2HfAl(Ga,Sn) are discussed and compared with the mhf systematics in Heusler alloys.work partially supported by CNEN and CNPq 相似文献
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176.
F.C. Dillon A. OMahony F.A. Deeney I.M. Povey M. Bardosova M.E. Pemble 《Photonics and Nanostructures》2007,5(2-3):91-95
We demonstrate that mesoporous silica particles capable of acting as receptacles for functional nanoparticles may be readily synthesized and then assembled into photonic crystal thin films displaying well-defined Bragg diffraction features in the visible region. We show that it is possible to tailor not only the particle diameter, but also the pore diameters within the particles. As an example of the possible application of such particles in photonic crystal fabrication we show that it is possible to deposit Fe2O3 nanoparticles on the exterior of and inside the pores of hexagonal phase mesoporous silica spheres. 相似文献
177.
In this article, we analyze the decisional power index, the so called Hoede-Bakker index. This index takes the preferences of the players into account, as well as the social structure in which players may influence each other. We investigate the properties of the Hoede-Bakker index. We adapt some postulates for power indices and voting power paradoxes for the Hoede-Bakker set up. We investigate whether this decisional power index displays the adapted voting power paradoxes and whether it satisfies the adapted postulates for power indices. 相似文献
178.
用真空电弧熔炼法制备了Ce2 Co17-xMx(M =Ga ,Al和Si)化合物。通过X射线衍射和磁性测量手段 ,研究了非磁性替代原子Ga,Al和Si的加入对Ce2 Co17化合物的居里温度和饱和磁化强度的影响 ,其中Si在Ce2 Co17化合物中的固溶度最小 ,并使居里温度和饱和磁化强度下降幅度最大。 相似文献
179.
Haris A. Alevras P. Mohammadpour M. Theodossiades S. O’ Mahony M. 《Nonlinear dynamics》2020,100(1):33-49
Nonlinear Dynamics - Recent developments in propulsion systems to improve energy efficiency and reduce hazardous emissions often lead to severe torsional oscillations and aggravated noise.... 相似文献
180.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option. 相似文献