Browsing Physics and Astronomy by Title
Now showing items 1332 of 398

Benchmark measurements and simulations of dose perturbations due to metallic spheres in proton beams
(2013)Monte Carlo simulations are increasingly used for dose calculations in proton therapy due to its inherent accuracy. However, dosimetric deviations have been found using Monte Carlo code when high density materials are ... 
Biomolecular dynamics: order–disorder transitions and energy landscapes
(2012)While the energy landscape theory of protein folding is now a widely accepted view for understanding how relativelyweak molecular interactions lead to rapid and cooperative protein folding, such a framework must be extended ... 
BoseEinstein Condensation of 84Sr
(20091109)We report BoseEinstein condensation of Sr84 in an optical dipole trap. Efficient laser cooling on the narrow intercombination line and an ideal swave scattering length allow the creation of large condensates (N0∼3×105) ... 
BoseEinstein condensation of 88Sr through sympathetic cooling with 87Sr
(20100505)We report BoseEinstein condensation of Sr88, which has a small, negative swave scattering length (a88=−2a0). We overcome the poor evaporative cooling characteristics of this isotope by sympathetic cooling with Sr87 atoms. ... 
BoseEinstein condensation of lithium
(1997)BoseEinstein condensation of 7Li has been studied in a magnetically trapped gas. Because of the effectively attractive interactions between 7Li atoms, manybody quantum theory predicts that the occupation number of the ... 
BoseEinstein Condensation of Lithium: Observation of Limited Condensate Number
(1997)BoseEinstein condensation of 7Li has been studied in a magnetically trapped gas. Because of the effectively attractive interactions between 7Li atoms, manybody quantum theory predicts that the occupation number of the ... 
Bridging quantum and classical plasmonics with a quantumcorrected model
(2012)Electromagnetic coupling between plasmonic resonances in metallic nanoparticles allows for engineering of the optical response and generation of strong localized nearfields. Classical electrodynamics fails to describe ... 
Bright matter wave solitons in Bose–Einstein condensates
(2003)We review recent experimental and theoretical work on the creation of bright matter wave solitons in Bose–Einstein condensates. In two recent experiments, solitons are formed from Bose–Einstein condensates of 7Li by ... 
Bright Soliton Trains of Trapped BoseEinstein Condensates
(2002)We variationally determine the dynamics of bright soliton trains composed of harmonically trapped BoseEinstein condensates with attractive interatomic interactions. In particular, we obtain the interaction potential between ... 
BROADBAND SPECTRAL INVESTIGATIONS OF SGR J1550−5418 BURSTS
(2012)We present the results of our broadband spectral analysis of 42 SGR J1550−5418 bursts simultaneously detected with the Swift/Xray Telescope (XRT) and the Fermi/Gammaray Burst Monitor (GBM), during the 2009 January active ... 
Broadband, PolarizationSensitive Photodetector Based on OpticallyThick Films of Macroscopically Long, Dense, and Aligned Carbon Nanotubes
(2013)Increasing performance demands on photodetectors and solar cells require the development of entirely new materials and technological approaches.Wereport on the fabrication and optoelectronic characterization of a ... 
Can Gap Tuning Schemes of LongRange Corrected Hybrid Functionals Improve the Description of Hyperpolarizabilities?
(20140902)Longrange corrected hybrid density functionals (LCDFT), with range separation parameters optimally tuned to obey Koopmans' theorem, are used to calculate the firstorder hyperpolarizabilities of prototypical chargetransfer ... 
Can Short and MiddleRange Hybrids Describe the Hyperpolarizabilities of LongRange ChargeTransfer Compounds?
(2014)The hyperpolarizabilities of five prototypical and four recently synthesized longrange chargetransfer (CT) organic compounds are calculated using short and middlerange (SR and MR) hybrid functionals. These results are ... 
Capturing static and dynamic correlations by a combination of projected HartreeFock and density functional theories
(2013)This paper explores the possibility of combining projected HartreeFock and density functional theories for treating static and dynamic correlations in molecular systems with meanfield computational cost. The combination ... 
Cellspecific transmembrane injection of molecular cargo with gold nanoparticlegenerated transient plasmonic nanobubbles
(2012)Optimal cell therapies require efficient, selective and rapid delivery of molecular cargo into target cells without compromising their viability. Achieving these goals exﾠvivo in bulk heterogeneous multicell systems such ... 
Chaotic ionization of a stationary electron state via a phase space turnstile
(2013)The ionization of a highly excited Rydberg atom subjected to a periodic sequence of electric field impulses, or “kicks,” is chaotic. We focus on the dynamics of a single kicking period in order to isolate the ionization ... 
Characterizing highn quasionedimensional strontium Rydberg atoms
(2014)The production of highn, n ∼ 300, quasionedimensional (quasi1D) strontium Rydberg atoms through twophoton excitation of selected extreme Stark states in the presence of a weak dc field is examined using a crossed ... 
Charged nanograins in the Enceladus plume
(2012)There have been three Cassini encounters with the southpole eruptive plume of Enceladus for which the Cassini Plasma Spectrometer (CAPS) had viewing in the spacecraft ram direction. In each case, CAPS detected a cold ... 
Chemical tuning of electrical transport in Ti1−xPtxSe2−y
(20150120)The structural and transport properties of polycrystalline Ti1−xPtxSe2−y(x≤0.13,y≤0.2) are studied, revealing highly tunable electrical properties, spanning nearly ten orders of magnitude in scaled resistivity. Using xray ...