Sökning: "absorption cross section"

Visar resultat 1 - 5 av 38 avhandlingar innehållade orden absorption cross section.

1. 1. Light Propagation and Gas Absorption Studies in Turbid Media Using Tunable Diode Llaser Techniques

   Författare :Liang Mei; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; gas in scattering media absorption spectroscopy; tunable diode laser absorption spectroscopy; frequency modulated light scattering interferometry; light propagation; Absorption spectroscopy; turbid media; diode laser; gas monitoring; porous media; ceramics; food packaging; Fysicumarkivet A:2014:Mei;

   Sammanfattning : Optical absorption spectroscopy is a widely used analytical tool for constituent analysis in many applications. According to the Beer-Lambert law, the transmitted light intensity through a homogeneous medium is an exponential function of the product of the concentration, the total pathlength, and the absorption cross-section of the absorbing substance. LÄS MER

3. 2. Moment Method Analysis of Antennas in Reverberation Chambers and Cylindrical Structures

   Författare :Ulf Carlberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cavity; spectral domain method; cylindrical structure; Ewald summation; Green s function; absorption cross section; moment method; reverberation chamber; antenna;

   Sammanfattning : This thesis is a collection of papers using the method of moments for numerical analysis. The papers can be divided into two main groups; a study of antennas in reverberationchambers, and a study of antennas in cylindrical structures.The reverberation chamber is a metal cavity for measuring antennas and other devices. LÄS MER

4. 3. Moment Method Analysis of Antennas in Reverberation Chambers and Cylindrical Structures

   Författare :Ulf Carlberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; antenna; spectral domain method; reverberation chamber; Ewald summation; moment method; cavity; cylindrical structure; Green s function; absorption cross section;

   Sammanfattning : This thesis is a collection of papers using the method of moments for numerical analysis. The papers can be divided into two main groups; a study of antennas in reverberation chambers and a study of antennas in cylindrical structures.The reverberation chamber is a metal cavity for measuring antennas and other devices. LÄS MER

5. 4. Theoretical Studies on Electronic and Vibrationally Resolved Multi-Photon Absorption and Dichroism

   Författare :Na Lin; Yi Luo; Marcel Nooijen; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Multi-photon absorption and dichroism; Vibronically resolved spectroscopy; Quantum chemistry; Kvantkemi;

   Sammanfattning : This thesis presents time-dependent density functional theory studies on electronic and vibronically resolved linear and nonlinear optical absorption and dichroism spectra of organic molecules. Special attention has been paid to the influence of solvent environment and molecular vibrations on one-, two- and three-photon absorption and one- and two-photon circular dichroism. LÄS MER

7. 5. High-resolution measurement of the ¹⁶O(γ,pn) reaction

   Författare :Lennart Isaksson; Lunds universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; pn ; E_gamma = 67-76 MeV; resolved states; cross-sections; Nuclear physics; Kärnfysik; Fysicumarkivet A:1996:Isaksson; 16O gamma; Photonuclear reaction;

   Sammanfattning : The 16O(gamma,pn) reaction has been measured with a resolution high enough to resolve individual low-lying states in the residual 14N nucleus. The relative population of the states provides detailed information about the quantum numbers of the proton-neutron pairs on which photons are absorbed. LÄS MER