نتایج جستجو برای: extinction coefficient

تعداد نتایج: 194873  

Journal: :Journal of the Air Pollution Control Association 1985

Journal: :Journal of Chemical Education 1983

Journal: :The Journal of Physical Chemistry C 2015

Journal: :The journal of physical chemistry. C, Nanomaterials and interfaces 2015
Helena de Puig Justina O Tam Chun-Wan Yen Lee Gehrke Kimberly Hamad-Schifferli

Gold nanostars (NStars) are highly attractive for biological applications due to their surface chemistry, facile synthesis and optical properties. Here, we synthesize NStars in HEPES buffer at different HEPES/Au ratios, producing NStars of different sizes and shapes, and therefore varying optical properties. We measure the extinction coefficient of the synthesized NStars at their maximum surfac...

2011
Xiaopeng Fang Yimin Xuan Qiang Li

A novel spectral transmittance approach for measuring the extinction coefficient of magnetic fluids is proposed. The measuring principle and accuracy of the approach are analysed. Experiments are conducted to measure the extinction coefficient of magnetic fluids with different particle volume fractions. The relative uncertainty of experimental data is less than 1.8%. The experimental results in...

Journal: :Optics letters 1993
O Yavas N Do A C Tam P T Leung W P Leung H K Park C P Grigoropoulos J Boneberg P Leiderer

The temperature dependence of the optical properties for amorphous silicon is studied at wavelengths of 632.8 and 752 nm. Both the refractive index and extinction coefficient increase linearly with temperature for 752 nm, while the refractive index decreases and the extinction coefficient increases for 632.8 nm. The rate of increase of the extinction coefficient at 632.8 nm is twice as much as ...

2016
Zefeng. Zhang Yan. Shen Yanwei. Li

The relationship between relative humidity (RH) and extinction properties is of widespread 10 concern. In this study, a hygroscopic parameter (κ) and the volume fraction of elemental carbon (EC) were used to characterize the chemical characteristics of particles, and a core-shell model was built based on these characteristics. The number distribution, chemical compositions and RH were measured ...

Journal: :Remote Sensing 2010
Pak Wai Chan

Backscattered power data from the Doppler LIght Detection And Ranging (LIDAR) systems at the Hong Kong International Airport (HKIA) could be used to obtain the extinction coefficient of the troposphere by combining with the meteorological optical range (MOR) data from the nearby forward scatter sensor. The Range-height Indicator (RHI) scan of the LIDAR is then utilized to derive the vertical pr...

2013
B.Sudharshan Reddy

Lidars have been employed in the investigation of instantaneous vertical structure of atmospheric particulate. Remote measurements of particle backscattering and aerosol extinction coefficient provide the altitude distribution of particles existence in the atmosphere. This paper describes the technology of micro pulse lidar employed for computation of altitude profiles of particle backscatterin...

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