10,921 research outputs found
Stability of a quadratic Jensen type functional equation in the spaces of generalized functions
AbstractMaking use of the fundamental solution of the heat equation we find the solution and prove the stability theorem of the quadratic Jensen type functional equation9f(x+y+z3)+f(x)+f(y)+f(z)=4[f(x+y2)+f(y+z2)+f(z+x2)] in the spaces of Schwartz tempered distributions and Fourier hyperfunctions
In-medium modification of P-wave charmonia from QCD sum rules
We investigate the changes of the masses and widths of and
in hot gluonic matter near and in nuclear medium using QCD
sum rules. As in the previous works for the and , in-medium
effects are incorporated through the changes of gluon condensates. Twist-2
terms for the and are also included
for the first time. The results show that larger mass shifts and width
broadenings take place as compared to the -wave states. As the critical
change take place near , related measurements can reveal critical
phenomenon in QCD.Comment: 7 pages, 6 figures, to be published in Phys.Rev.
Solar and supernova neutrino physics with future NaI(Tl) dark matter search detectors
We investigate the prospects for measuring the coherent elastic
neutrino-nucleus scattering of solar and supernova neutrinos in future NaI(Tl)
dark matter detection experiments. Considering the reduced background and
improved light yield of the recently developed NaI(Tl) crystals, more than
3 observation sensitivities of the supernova neutrino within the Milky
Way are demonstrated. In the case of the solar neutrino, approximately 3
observations are marginal with a 1 ton NaI(Tl) experiment assuming an order of
magnitude reduced background, five photoelectron thresholds, and 5-year data
exposure
Rubisco activity and gene expression of tropical tree species under light stress
Tropical rain forests contain an ecologically and physiologically diverse range of vegetation and habitats. Sun-acclimated plants can be divided into two groups, shade-tolerant and shade-intolerant, according to the plant’s physiological and genetic responses. Some tropical species have potential capacity for light damage in a shaded environment as well as shade-tolerance to compensate for the impaired light harvesting complex. In particular, ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco) is regulated by the Calvin cycle, which participated in protein synthesis. Rubisco plays a role in CO2 fixation, which helps supply the energy to regulate Rubisco for ribulose 1,5-bisphosphate (RuBP) reduction. Light intensity is associated with the photosynthetic rate and genetic response to moderate growth environments.Keywords: Gene expression, growth, light intensity, Rubisco activityAfrican Journal of Biotechnology Vol. 12(20), pp. 2764-276
Ballistic Transport in Carbon Nanotubes from First-Principles Molecular Dynamics Simulations
We determined the Landauer ballistic conductance of pristine nanotubes at finite temperature via a novel scheme that combines ab-initio molecular dynamics, maximally-localized Wannier functions, and a tight-binding formulation of electronic transport in nanostructures. Large-scale ab-initio molecular dynamics simulations are used to obtain efficiently accurate trajectories in phase space. The extended Bloch orbitals for states along these trajectories are converted into maximally-localized orbitals, providing an exact mapping of the ground-state electronic structure onto a short-ranged Hamiltonian. Green's functions, self-energies, and ballistic conductance can then be obtained for any given configuration, and averaged over the appropriate statistical ensemble.Singapore-MIT Alliance (SMA
A new palladium alloy with near-ideal hydrogen storage performance
Hydrogen-based fuels demand high-density storage that can operate under
ambient temperatures. Pd and its alloys are the most investigated metal
hydrides for hydrogen fuel cell applications. This study presented an
alternative Pd alloy for hydrogen storage that can store and release hydrogen
at room temperature. The surface of the most studied Pd (110) was modified with
Au and Rh so that the hydrogen adsorption energy was 0.49 eV and the release
temperature was 365 K. Both values are quite near to the optimum values for the
adsorption energy and release temperature of a hydrogen fuel cell in real-world
usage
- …