نتایج جستجو برای: defect mode

تعداد نتایج: 316268  

Journal: :Journal of The Optical Society of America B-optical Physics 2022

Photonic crystals based on graphene plasmons (GPs) are highly tunable and can accurately control photonic transmission at the nanoscales. In this work, transfer matrix method (TMM) is introduced to study plasmonic crystal (GPC) with periodic surface conductivity in case of normal incidence. The introduction TMM after considering abnormal phase scattering abrupt interface gives an idea manipulat...

Journal: :Buildings 2022

Regarding the effect of initial geometric defect (IGD) on static stability single-layer reticulated shells, its distribution pattern and magnitude are main concerns to researchers. However, suitable selection (IGDM) is still a controversial topic. Therefore, it intended study determination proper IGDM based structure force state (SFS) coefficient. In order find out qualified IGDM, more than 520...

Journal: :The Journal of chemical physics 2006
Tracey M Clarke Keith C Gordon David L Officer Daina K Grant

The structures and vibrational properties of a series of styryl-substituted sexithiophenes and their charged species have been examined using resonance Raman spectroscopy in conjunction with density functional theory calculations. The calculated geometries of the radical cations and dications indicate that the quinoidal charged defects are more strongly localized in the center of the thiophene ...

Journal: :the journal of tehran university heart center 0
bagher nikyar gorgan congenital malformations research center, golestan university of medical sciences, gorgan, iran. maliheh sedehi gorgan congenital malformations research center, golestan university of medical sciences, gorgan, iran. mostafa qorbani department of public health, alborz university of medical sciences, karaj, iran and non-communicable diseases research center, endocrinology and metabolism research insti- tute, tehran university of medical sciences, tehran, iran. arash nikyar cranfield university, london, england. mohammadjafar golalipour gorgan congenital malformations research center, golestan university of medical sciences, gorgan, iran.

background: congenital heart disease (chd) is the most common congenital anomaly in newborns. this study was performed to determine the live birth incidence of chd by ethnicity and sex in gorgan, northern iran. methods: in this longitudinal, hospital-based study, 18162 live births in dezyani hospital in gorgan, north of iran, were screened for chd, from 2007 through 2009. clinical examination, ...

2014
Jun-long Kou Hyuck Choo

We propose a novel approach to confine light in a silica microfiber (MF) cavity using a lattice-constant-varying nanohole array. The MF cavity integrated with an optimally designed nanohole array produces Q-factors ~ 7×10 in the near infrared region while its mode volume remains ~ (λe). Our MF cavity of enhanced performance will find potential applications in fiber lasers, nonlinear fiber optic...

Objective(s): Use of a positron emission tomography (PET)/single-photonemission computed tomography (SPECT) system facilitates the simultaneousacquisition of images with fluorine-18 fluorodeoxyglucose (18F-FDG) andtechnetium (99mTc)-tetrofosmin. However, 18F has a short half-life, and 511keV Compton-scattered photons are detected in the 99mTc energy window.Therefore, in this study, we aimed to ...

2013
Sanjeev K. Srivastava Maitreyi Upadhyay Suneet K. Awasthi S. P. Ojha

We show theoretically that range of reflection bands and defect modes inside the band gap can be tuned by using a one-dimensional tilted photonic crystal (TPC) structure. A TPC structure is similar to the conventional PC structure with the only difference that in this case alternate layers are inclined at certain angle in the direction of periodicity of the structure. In order to obtain the ref...

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