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Dielectric Function of Silicon Nanoclusters: Role of Hydrogen

Chinese Physics Letters 2011年第9期28卷 241-244页

作者： SIB KRISHNA Ghoshal M.R.Sahar M.S.rohani Advanced Optical Material Research Group Department of PhysicsFaculty of ScienceUniversiti Teknologi Malaysia81310 UTM SkudaiJohorMalaysia

Electronic and optical properties of small silicon quantum dots having 3 to 44 atoms per dot with and without surface passivation are investigated by computer simulation using the pseudo-potential *** empirical pseudo-potential Hamiltonian,a plane-wave basis expansion and a basic tetrahedral structure with undistorted local bonding configurations are *** structures of the quantum dots are relaxed and optimized before and after hydrogen *** is found that the gap increases more for a hydrogenated surface than the unpassivated ***,both quantum confinement and surface passivation determine the optical and electronic properties of Si quantum *** luminescence is probably due to the radiative recombination of electrons and holes in the quantum-confined *** effect of passivation of the surface dangling bonds by hydrogen atoms and the role of surface states on the gap energy is also *** results for the density of states,the dielectric function,the frequency dependent optical absorption cross section,the extinction coefficient and the static dielectric constants of the size are *** importance of the confinement and the role of surface passivation on the optical effects are discussed.

关键词： quantum dielectric extinction

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Progress in rubella control initiated through measles elimination strategies:the Malaysian experience

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Asian Pacific journal of Tropical Medicine 2009年第6期2卷 28-32页

作者： Saraswathy TS Az-Ulhusna A Nor Zahrin H Nurhasmimi Hassan Zainah S rohani.j Institute for Medical Research Jalan Pahang50588 Kuala Lumpur Surveillance Unit Disease Control DivisionMinistry of HealthMalaysia National Public Health Laboratory Sg BulohSelangor

Objective:To analyse the laboratory surveillance data from 2004 till 2008 to examine the changing trend of rubella cases in ***:Samples for this study were either received through the measles case based surveillance program or were hospital cases received for sero-diagnosis of congenital rubella syndrome(CRS). Specific rubella IgM antibody test was carried out on all samples that were negative for measles IgM antibody and for sero-diagnosis of ***:Through the surveillance program for measles,the samples received for rubella had increased five fold from 365 in 2004 to 1 522 in *** rubella cases detected had also increased from 4.1%in 2004 to 33.2%in *** age group 11 to 20 years accounted for 73.6%of rubella cases confirmed in 2008,with a higher incidence among males than *** rubella IgM was detected in 25 CRS cases during the 6 year period between january 2003 and December ***:The measles elimination program had contributed to significant progress in the control of rubella,with the majority of rubella cases detected through this *** rubella is not notifiable in Malaysia,this integrated measles and rubella surveillance should be ***,to enhance the progress,specific targets should also be established in the national program to eliminate rubella and CRS.

关键词： Rubella Congenital rubella syndrome Mump-measles-rubella(MMR) vaccination Surveillance

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Numerical Simulation of Behaviour of Granular Material During Shearing

Numerical Simulation of Behaviour of Granular Material Durin...

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第五届国际粉体检测与控制学术会议

作者： j.C.ROTH S.Y.rohani L.P.M.M.-I.S.G.M.E-URA CNRS 1215 University de Metz Ile du Sauley 57045 METZ Cedex 01

*** The design of grain or particulate materials storage structures requires,above all,the calculation of normal pressures on silo walls,in general,the stored grain material is considered as a continuous *** methods o...

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