Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Particle Scattering"”.
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Fast algorithms for small particle scattering problems
In scattering problems, commonly used techniques are surface and volume integral equations. Discrete dipole approximation (DDA) is an alternate and useful discretization technique to solve these problems where the continuum scatterer is replaced by a set of polarizable dipoles. It is an alternative …
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Alpha-Alpha Particle Scattering at 21.8 and 22.9 Mev
Made available in DSpace on 2015-05-12T17:11:46Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0007832.PDF: 4503619 bytes, checksum: b9ba91d167c76c8b3925f8883b81c2fd (MD5) Previous issue date: 1954
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Proton-Alpha-Particle Scattering at a Proton Energy of 5.8 Mev
Made available in DSpace on 2015-05-12T17:11:48Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0009031.PDF: 3323305 bytes, checksum: d9e2afc1c8b181cc5a6408297274a470 (MD5) Previous issue date: 1952
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Nuclear mass distributions and the optical model for Alpha particle scattering.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1972. Ph.D.
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Automating methods to improve precision in Monte-Carlo event generation for particle colliders
… for a theoretical description of high energy particle scattering experiments. It focuses on fixed order perturbative calculations, i.e. on matrix elements and scattering cross sections at leading and next-to-leading order. For the leading order a number of algorithms for the matrix element …
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Evaluation of triple-frequency radar retrieval of snowfall properties using coincident airborne in-situ observations during olympex
Particle scattering models have shown that aggregates and spherical particles occupy distinct regions of the Ku-Ka-W-band Dual-Frequency Ratio (DFR) plane. Furthermore, ground-based observations suggest that particle bulk density and characteristic size can be retrieved from the DFR plane. This is …
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Physical and Chemical Properties of Laboratory and Ambient Aerosols Related to Climate Change
… agreement between measured and predicted total scattering coefficients (sigmasp) at RH = 80% from 35% to 11%. The closure experiment revealed the importance of keeping the nephelometry system isothermal when measuring particle scattering coefficients as a function of RH or as particles exist in …
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The Structure of Baryon Resonances
… provides a bridge between the infinite-volume scattering data of ex- periment, and finite-volume energy spectra from lattice QCD. By discretising a Hamilto- nian which has been constrained to experimental scattering data, solving the eigenvalue equation for the Hamiltonian provides a …
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Nanoscale Thermal Fluctuation Spectroscopy
… coefficients, attributed to increased electron scattering at the surface, were so dominant that further data was collected through straight-forward resistance measurements. The resistance data confirmed the thermal noise measurements thus lending considerable evidence to the presence of thin …
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Characterisation of Microphysical and Optical Properties of Atmospheric Aerosols in a High Arctic environment: Villum Research Station, NE Greenland
Atmospheric aerosols are solid or liquid phase particles which are suspended in ambient air. These particles have an impact on the climate through direct and indirect radiative forcing, and their measurement presents challenges in high latitude environments where concentrations may fall under the …
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Numerical simulations of the forward problem and compressive digital holographic reconstruction of weak scatterers on a planar substrate
… the electric field from a sparse distribution of particle scattering; compressive sensing retrieves a clean signal from the original measured signal corrupted by shot noise and other system noise with a sparsity prior and auto-parameter tuning based on signal characteristics. Strong denoising …
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SOLAR MODULATION OF GALACTIC COSMIC RAYS: TECHNIQUES & APPLICATIONS (SHOCK ACCELERATION, ANTIPROTONS)
… illustrated this method, using enhanced particle scattering regions. This model accounted for at least three key sets of observations: the cosmic-ray radial intensity gradients; the decrease in cosmic-ray intensity over the solar cycle; and the hysteresis between low and high-energy …
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Temporal variability of fluorescent dissolved organic matter at a brackish, tidal marsh-estuary interface
… Corrections for attenuation by particle scattering and absorbance were developed for this sensor and site, and evaluated. We assessed the capability of retrieving DOC concentrations (a biogeochemical variable) based on <em>in situ </em>F<sub>DOM </sub>and additional water quality …
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COHERENT DETECTION OF SCATTERED LIGHT BY SUBMICROMETER AEROSOLS.
A particle counting instrument, the Coherent Optical Particle Spectrometer (COPS) has been developed for measuring particles in aerosol systems. It optically counts and sizes single particles one at a time as they pass through an optically defined inspection region so particle size distributions …
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Development Of A Two-Color Optical Diagnostic For The Determination Of Engine In-Cylinder Soot Temperature And Volume Fraction Evolution With A Flame-Calibrated Emissivity Model
… diagnostic techniques such as -- Rayleigh scattering, filtered Raman scattering (Doppler), Raman scattering, coherent anti-stokes Raman spectroscopy (CARS), vibrational thermally-assisted fluorescence, two-line atomic fluorescence, two-line molecular fluorescence, chemiluminescence …
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Pressure Tuned Magnetism in d- and f-Electron Materials
… phase transition. A sharp increase in the quasi-particle scattering cross-section as well as the residual resistivity accompany a departure from the quadratic temperature dependence of the resistivity. This possible deviation from Fermi liquid behaviour is stable over a significant range of …
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Charged-Particle Transport in Turbulent Magnetic Fields
… of the transport of high-energy charged particles both parallel and perpendicular to the average magnetic field in such a system is of considerable interest. It is recognized that the turbulent magnetic field has important effects on the transport of charged particles and that the …
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Nanostructures and alloys : multiple scattering and nonlinearities in phonon transport
… and dielectrics. Effective field theories and scattering theory have been combined to model alloys and systems with embedded nanostructures. The simplest of such effective field theories, the Virtual Crystal approximation, fails to capture short-length scale information due to the inherent …
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Non-equilibrium dynamics of ultracold atoms in optical lattices
… at high lattice depths with a short-range, two-particle scattering model without free parameters, despite an apparent violation of the Mott-Ioffe-Regel bound. Our results may have implications for models of unusual transport phenomena in materials with strong interactions, such as heavy fermion …
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Improving active remote sensing retrievals of snowfall at microwave wavelengths: an emphasis on the global precipitation measurement mission’s dual-frequency precipitation radar
… measurements of both rain and snow and their particle size distributions allowed for the assessment of the main microphysical assumption of the GPM-DPR retrieval, which assumes that all hydrometeors obey the same empirical relationship between the precipitation rate (R) and the mass-weighted …
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