A5079482016- Atomic and Molecular Physics
- Nuclear physics research studies
- Advanced Chemical Physics Studies
- Quantum Chromodynamics and Particle Interactions
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- X-ray Spectroscopy and Fluorescence Analysis
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Food Quality and Safety Studies
- Shape Memory Alloy Transformations
- High-Energy Particle Collisions Research
- Radiation Effects and Dosimetry
- Topology Optimization in Engineering
- Meat and Animal Product Quality
- Medical Image Segmentation Techniques
- Physics of Superconductivity and Magnetism
- Advanced Vision and Imaging
- Particle Accelerators and Free-Electron Lasers
- Composite Structure Analysis and Optimization
- Quantum and Classical Electrodynamics
- Erosion and Abrasive Machining
- Surface and Thin Film Phenomena
University of Technology Sydney
2024
North Carolina Agricultural and Technical State University
2019-2020
University of Regina
2017
North Carolina Central University
2012
University of Arkansas at Fayetteville
2010
Tyson Foods (United States)
2006-2010
Iowa State University
2010
North Carolina State University
1980-2007
Dartmouth College
2007
University of North Carolina at Chapel Hill
2005
A new procedure is suggested to improve the convergence of complex-rotation method. Calculations are carried out for $\mathrm{He}2s2s^{1}S$ and $2s2p^{1}P$ resonances. With a relatively small simple wave function, one obtains width which stable six digits over wide range rotational angles nonlinear parameters. The results compared with those most accurate theoretical calculations experiments. feasibility applying this method more complicated systems as well multichannel problems also discussed.
Fragmentation and splitting of the Gamow-Teller (GT) strength has been observed in a systematic study ${(}^{3}$He,t) charge-exchange reaction at E${(}^{3}$He)=200 MeV over entire range stable Sn isotopes. Triton energy spectra were with high-resolution magnetic spectrometer angles near \ensuremath{\theta}=0\ifmmode^\circ\else\textdegree\fi{} where \ensuremath{\Delta}L=0 transitions are enhanced. Excitation energies, widths, 0\ifmmode^\circ\else\textdegree\fi{} cross sections, strengths B(GT)...
A pedagogic experimental and theoretical study of the motion simple pendulum, which considers corrections to approximation harmonic motion, is presented. The period calculated with use both elliptic integrals perturbation theory Kryloff Bogoliuboff. Measurements pendulum taken a stopwatch are compared calculations. errors made in measurements analyzed.
We used the $^{16}\mathrm{O}$${(}^{3}$He,n${)}^{18}$Ne, $^{12}\mathrm{C}$${(}^{12}$C${,}^{6}$He${)}^{18}$Ne, and $^{20}\mathrm{Ne}$(p,t${)}^{18}$Ne reactions to study $^{18}\mathrm{Ne}$ states up an excitation energy of 10 MeV, with emphasis on levels corresponding $^{14}\mathrm{O}$(\ensuremath{\alpha},p${)}^{17}$F $^{17}\mathrm{F}$(p,\ensuremath{\gamma}${)}^{18}$Ne resonances that could strongly affect these reaction rates in hot stellar environments. Excitation energies, widths, absolute...
The isoscalar giant dipole resonance (ISGDR) in ${}^{208}\mathrm{Pb}$ has been investigated using inelastic scattering of 200 MeV $\ensuremath{\alpha}$ particles at and near 0\ifmmode^\circ\else\textdegree\fi{} where the angular distribution ISGDR can be clearly differentiated from those other modes. ``difference spectra'' technique was employed to separate high-energy octupole (HEOR). These data provide clearest evidence yet for adjacent HEOR. With these results, all expected...
The effect of irradiation on thiobarbituric acid reactive substances (TBARS) and volatile compounds in raw cooked nonirradiated irradiated chicken breast meat infused with green tea grape seed extracts was investigated. Chicken vacuum extract (3,000 ppm), or their combination (at a total 6,000 an electron beam, stored at 5 degrees C for 12 d. targeted dosage 3.0 kGy the average absorbed 3.12 kGy. Values TBARS compound contents were determined during 12-d storage period. Thiobarbituric values...
The saddle-point technique is applied to the helium atom below ionization threshold and for $^{1}P$ $^{3}P$ resonances in elastic-, inelastic-scattering energy region. results generally support assertion that method gives best square-integrable approximation within inner-shell vacancy picture excited or autoionizing states. For resonance where Feshbach shift negative, essentially same result as of $\mathrm{QHQ}$ approximation. However, with a large positive shift, new are substantially...
This paper presents a method for large deformation exemplar template estimation. generates representative anatomical from an arbitrary number of topologically similar images using minimum mean squared error image registration. The that we generate is the requires least amount energy to be transformed into every input image. We show this also useful In particular, it provides means inverse consistent computationally practical; computation time grows linearly with images. Template estimation...
The saddle-point complex-rotation method in the intermediate LSJ-coupling scheme is used with Breit-Pauli spin-dependent perturbation operators to compute spin-induced autoionization rates of lithiumlike 1s2s2p $^{4}P_{J}^{o}$ states from Z=3 18. radiative transition J=(1/2 and (3/2 levels are also calculated scheme. combined result yields lifetimes for these which compared existing experimental theoretical data literature.
The autoionization widths of the lower $^{2}\mathrm{S}$, ${}^{2}$${P}^{o}$, and $^{2}\mathrm{D}$ Feshbach resonances in Li i, Be ii, B iii are calculated with saddle-point complex-rotation method. For ii radiation also computed. Relativistic mass polarization corrections to resonance energy included. width results for [1s(2s2p)${}^{3}$P]${}^{2}$${P}^{o}$ (1s2p2p)${}^{2}$D states compared other theoretical recently published experimental i ii. Transition wavelengths involving these...
High-resolution measurements of oxygen K Auger electrons have been performed using multiply charged 10-MeV ${\mathrm{O}}^{\mathrm{n}+}$ (n=2, 3, and 4) projectiles in collisions with He. Line-broadening effects are strongly reduced so that high-resolution spectroscopy is possible for ejected from fast projectiles. The spectra obtained ${\mathrm{O}}^{4+}$ ${\mathrm{O}}^{3+}$ impact show relatively simple structures dominated by lines arising three-electron (Li-like) four-electron (Be-like)...
The saddle-point complex-rotation method is tested for a three-electron system by calculating the ${(1s2s2s)}^{2}S$ resonance in ${\mathrm{He}}^{\ensuremath{-}}$, Li I, Be II, and B III. energy position width obtained this are well converged wide range of rotation angles nonlinear parameters all atomic systems considered. To obtain higher accuracy, relativistic mass polarization corrections also calculated. results compared with those most accurate theoretical calculations experiments. For...
The energies and wavefunctions of thirteen doubly-excited nine triply-excited resonances Be+ are calculated using the saddle point technique. These results used to make identifications in Auger spectra observed by Rodbro et al. (1979). For all within experimental uncertainty quoted. resonances, fourteen lines identified. compared with those found for lithium. strong similarities between these systems provides supporting evidence that both probably correct.
We report the first complex-rotation calculation which incorporates spin-dependent perturbations. By using intermediate $\mathrm{LSJ}$ coupling scheme, lifetimes due to spin-induced autoionization of lithiumlike metastable $(1s2s2p)^{4}P_{\frac{5}{2}}$ state are determined along isoelectronic series for $Z=2\ensuremath{-}10$ and $Z=16\ensuremath{-}18$. The results compared with experimental measurements other theoretical results.
The Spin Asymmetries of the Nucleon Experiment measured two double spin asymmetries using a polarized proton target and electron beam at energies, 4.7 5.9 GeV. A large-acceptance open-configuration detector package identified scattered electrons 40\ifmmode^\circ\else\textdegree\fi{} covered wide range in Bjorken $x$ ($0.3<x<0.8$). Proportional to an average color Lorentz force, twist-3 matrix element, ${\stackrel{\texttildelow{}}{d}}_{2}^{p}$, was extracted from ${Q}^{2}$ values ranging 2.0...
Twenty-four quartet states of ${\mathrm{Be}}^{+}$ are calculated using configuration-interaction wave functions. Relativistic and mass polarization corrections included. The relativistic considered correction to the kinetic energy, Darwin term, retardation effect. fine structure is spin-orbit, spin-other-orbit, spin-spin operators. transition wavelengths in this work improve agreement between theory experiment most cases. lifetimes computed present generally agree with those experiment....
The Rayleigh-Ritz variational method is used with a multiconfiguration-interaction function to obtain the nonrelativistic energies and wave functions of triply excited 2${\mathit{p}}^{2}$np $^{4}$S\ifmmode^\circ\else\textdegree\fi{} (n=2,3,4) 2${\mathit{p}}^{2}$3p $^{2}$S\ifmmode^\circ\else\textdegree\fi{} states also doubly 1s2pmp $^{4}$P (m=2,3,4), 1s2${\mathit{p}}^{2}$ $^{2}$P, [(1s2p${)}^{3}$P,3p${]}^{2}$P, [(1s2p${)}^{1}$P,3p${]}^{2}$P for atomic systems nuclear charges from Z=3 10....
The saddle-point complex-rotation method in the intermediate LSJ coupling scheme is used with Pauli-Breit spin-dependent perturbation operators to compute spin-induced autoionization rates of lithiumlike 1s2p2p ${\mathrm{}}^{4}$${P}_{J}$ states from Z=3 Z=10. radiative transition these levels are also calculated scheme. combined result yields lifetimes which compared existing experimental and theoretical data literature.
It is well known that including the coordinate ${r}_{12}$ in wave function essential obtaining highly accurate results for low-lying bound states of two-electron systems. In this work we calculate energy, function, oscillator strength, radial expectation values, and mass-polarization effect helium by using simple configuration-interaction basis functions. Our show advantage lost quickly going from $S$ to $D$ states. most cases, give substantial improvement over previous calculations where...
Seventeen bound and core-excited states of ${\mathrm{Be}}^{+}$ are calculated using configuration-interaction wave functions. Relativistic mass-polarization corrections included. The relativistic considered correction to the kinetic energy, Darwin term, contact terms, retardation effect. fine structure is by spin-orbit spin-other-orbit operators. wavelengths computed for transitions from improve agreement between theory experiment. lifetimes these also calculated. Our transition structures...
ABSTRACT Boneless, skinless chicken breasts were infused with grape seed extract (GSE), green tea (GTE), tertiary butylhydroxyquinone and a combination of GTE GSE. Samples irradiated their physicochemical properties assessed over 9 months frozen storage (−20C). Irradiation did not affect pH or water-holding capacity. The effect irradiation on the lightness value, L*, varied depending time infusion treatment. increased redness (P < 0.05) except for samples (3,000 ppm). maximum shear force,...
A photofission experiment was performed on targets of ${}^{235}$U, ${}^{238}$U, ${}^{239}$Pu, and ${}^{232}$Th using nearly 100$%$ linearly polarized, high-intensity ($\ensuremath{\sim}$10${}^{7}$ $\ensuremath{\gamma}/$s), monoenergetic $\ensuremath{\gamma}$-ray beams having energies between 5.6 7.3 MeV at the High Intensity Source (HI$\ensuremath{\gamma}$S). An array 18 liquid scintillator detectors used to measure prompt fission neutron polarization asymmetries. asymmetry close zero found...
The ratio of the electric and magnetic form factor proton, $\mu_p G_E^p/G_M^p$, has been measured for elastic electron-proton scattering with polarized beam target up to four-momentum transfer squared, $Q^2=5.66$ (GeV/c)$^2$ using double spin asymmetry orientation aligned nearly perpendicular momentum direction. This measurement G_E^p/G_M^p$ agrees $Q^2$ dependence previous recoil polarization data reconfirms discrepancy at high between Rosenbluth polarization-transfer method a different...
The saddle-point complex-rotation method is used to compute the energies and autoionization widths of 1s3s3p $^{4}$P\ifmmode^\circ\else\textdegree\fi{} 1s3p3p $^{4}$P Feshbach resonances for lithiumlike ions with nuclear charges from Z=2 6. These doubly core-excited quartet states rapidly autoionize, emitting low-energy electrons via continua associated 1s2s $^{3}$S 1s2p $^{3}$P\ifmmode^\circ\else\textdegree\fi{} residual ion. radiative decay rates these initial are shown be small relative...
An experimental and numerical investigation into the static dynamic responses of shape memory alloy hybrid composite (SMAHC) beams is performed to provide quantitative validation a recently commercialized analysis/design tool for SMAHC structures. The beam specimens consist matrix with embedded pre-strained SMA actuators, which act against mechanical boundaries structure when thermally activated adaptively stiffen structure. Numerical results are produced from model as implemented commercial...