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RISS 인기검색어
- 검색키워드
- 저자 : Nasari, Masoud M. (검색결과 2 건)
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Nasari, Masoud M.,Szyszkowicz, Mieczysław,Chen, Hong,Crouse, Daniel,Turner, Michelle C.,Jerrett, Michael,Pope III, C. Arden,Hubbell, Bryan,Fann, Neal,Cohen, Aaron,Gapstur, Susan M.,Diver, W. Ryan,Stie Springer Netherlands 2016 AIR QUALITY ATMOSPHERE AND HEALTH Vol.9 No.8
<P>The effectiveness of regulatory actions designed to improve air quality is often assessed by predicting changes in public health resulting from their implementation. Risk of premature mortality from long-term exposure to ambient air pollution is the single most important contributor to such assessments and is estimated from observational studies generally assuming a log-linear, no-threshold association between ambient concentrations and death. There has been only limited assessment of this assumption in part because of a lack of methods to estimate the shape of the exposure-response function in very large study populations. In this paper, we propose a new class of variable coefficient risk functions capable of capturing a variety of potentially non-linear associations which are suitable for health impact assessment. We construct the class by defining transformations of concentration as the product of either a linear or log-linear function of concentration multiplied by a logistic weighting function. These risk functions can be estimated using hazard regression survival models with currently available computer software and can accommodate large population-based cohorts which are increasingly being used for this purpose. We illustrate our modeling approach with two large cohort studies of long-term concentrations of ambient air pollution and mortality: the American Cancer Society Cancer Prevention Study II (CPS II) cohort and the Canadian Census Health and Environment Cohort (CanCHEC). We then estimate the number of deaths attributable to changes in fine particulate matter concentrations over the 2000 to 2010 time period in both Canada and the USA using both linear and non-linear hazard function models.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1007/s11869-016-0398-z) contains supplementary material, which is available to authorized users.</P>
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Active Focusing of Light in Plasmonic Lens via Kerr Effect
Hadiseh Nasari,Mohammad Sadegh Abrishamian 한국광학회 2012 Current Optics and Photonics Vol.16 No.3
We numerically demonstrate the performance of a plasmonic lens composed of an array of nanoslits perforated on thin metallic film with slanted cuts on the output surface. Embedding Kerr nonlinear material in nanoslits is employed to modulate the output beam. A two dimensional nonlinear-dispersive finitedifference time-domain (2D N-D-FDTD) method is utilized. The performance parameters of the proposed lens such as focal length, full-width half-maximum, depth of focus and the efficiency of focusing are investigated. The structure is illuminated by a TM-polarized plane wave and a Gaussian beam. The effect of the beam waist of the Gaussian beam and the incident light intensity on the focusing effect is explored. An exact formula is proposed to derive electric field E from electric flux density D in a Kerr-Dispersive medium. Surface plasmon (SPs) modes and Fabry-Perot (F-P) resonances are used to explain the physical origin of the light focusing phenomenon. Focused ion beam milling can be implemented to fabricate the proposed lens. It can find valuable potential applications in integrated optics and for tuning purposes.
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