824 research outputs found
Enhanced Gas-Flow-Induced Voltage in Graphene
We show by systemically experimental investigation that gas-flow-induced
voltage in monolayer graphene is more than twenty times of that in bulk
graphite. Examination over samples with sheet resistances ranging from 307 to
1600 {\Omega}/sq shows that the induced voltage increase with the resistance
and can be further improved by controlling the quality and doping level of
graphene. The induced voltage is nearly independent of the substrate materials
and can be well explained by the interplay of Bernoulli's principle and the
carrier density dependent Seebeck coefficient. The results demonstrate that
graphene has great potential for flow sensors and energy conversion devices
Residue theorem and summing over Kaluza-Klein excitations
Applying the equations of motion together with corresponding boundary
conditions of bulk profiles at infrared and ultraviolet branes, we verify some
lemmas on the eigenvalues of Kaluze-Klein modes in framework of warped extra
dimension with the custodial symmetry . Using the lemmas and performing properly
analytic extensions of bulk profiles, we present the sufficient condition for a
convergent series of Kaluze-Klein excitations and sum over the series through
the residue theorem. The method can also be applied to sum over the infinite
series of Kaluze-Klein excitations in unified extra dimension. Additional, we
analyze the possible connection between the propagators in five dimensional
full theory and the product of bulk profiles with corresponding propagators of
exciting Kaluze-Klein modes in four dimensional effective theory, and recover
some relations presented in literature for warped and unified extra dimensions
respectively. As an example, we demonstrate that the corrections from neutral
Higgs to the Wilson coefficients of relevant operators for contain the suppression factor comparing
with that from other sectors, thus can be neglected safely.Comment: 44 pages, no figur
Recommended from our members
Sub-Doppler Molecular-Iodine Transitions near the Dissociation Limit (523–498 nm)
A widely tunable and high-resolution spectrometer based on a frequency-doubled Ti:sapphire laser was used to explore sub-Doppler transitions of iodine molecules in the wavelength range 523–498 nm. The wavelength dependence of the hyperfine transition linewidth of iodine was mapped out in this region, and the narrowest linewidth was ∼4 kHz near 508 nm. The hyperfine-resolved patterns were found to be largely modified toward the dissociation limit. The observed excellent signal-to-noise ratio should lead to high-quality optical frequency standards that are better than those of the popular 532-nm system
JefiGPU: Jefimenko's Equations on GPU
We have implemented a GPU version of the Jefimenko's equations -- JefiGPU.
Given the proper distributions of the source terms (charge density) and
(current density) in the source volume, the algorithm gives the
electromagnetic fields in the observational region (not necessarily overlaps
the vicinity of the sources). To verify the accuracy of the GPU implementation,
we have compared the obtained results with that of the theoretical ones. Our
results show that the deviations of the GPU results from the theoretical ones
are around 5\%. Meanwhile, we have also compared the performance of the GPU
implementation with a CPU version. The simulation results indicate that the GPU
code is significantly faster than the CPU version. Finally, we have studied the
parameter dependence of the execution time and memory consumption on one NVIDIA
Tesla V100 card. Our code can be consistently coupled to RBG (Relativistic
Boltzmann equations on GPUs) and many other GPU-based algorithms in physics.Comment: 21 pages, 8 figures, 4 table
Recommended from our members
NCP activates chloroplast transcription by controlling phytochrome-dependent dual nuclear and plastidial switches.
Phytochromes initiate chloroplast biogenesis by activating genes encoding the photosynthetic apparatus, including photosynthesis-associated plastid-encoded genes (PhAPGs). PhAPGs are transcribed by a bacterial-type RNA polymerase (PEP), but how phytochromes in the nucleus activate chloroplast gene expression remains enigmatic. We report here a forward genetic screen in Arabidopsis that identified NUCLEAR CONTROL OF PEP ACTIVITY (NCP) as a necessary component of phytochrome signaling for PhAPG activation. NCP is dual-targeted to plastids and the nucleus. While nuclear NCP mediates the degradation of two repressors of chloroplast biogenesis, PIF1 and PIF3, NCP in plastids promotes the assembly of the PEP complex for PhAPG transcription. NCP and its paralog RCB are non-catalytic thioredoxin-like proteins that diverged in seed plants to adopt nonredundant functions in phytochrome signaling. These results support a model in which phytochromes control PhAPG expression through light-dependent double nuclear and plastidial switches that are linked by evolutionarily conserved and dual-localized regulatory proteins
mixing in supersymmetry with gauged baryon and lepton numbers
We perform an analysis on mixing in the extension of
the minimal supersymmetric standard model where baryon and lepton numbers are
local gauge symmetries (BLMSSM) by using the effective Hamiltonian method. And
the constraint of a 125 GeV Higgs to the parameter space has also been
consid-ered. The numerical results indicate that the contributions of the extra
particles can be sizeable in mixing. For certain
parameter sets, the theoretical prediction of mass differences
agrees with the current experimental result. Furthermore, mixing in the BLMSSM can preliminarily constrain the parameter space.
With the development of more precise theoretical analysis and experimental
determina-tions, the mixing in the BLMSSM will have a
clearer picture and the parameter space in this model will also be further
constrained.Comment: 31 pages, 7 figures, 4 table
Post-activation Performance Enhancement after a Bout of Accentuated Eccentric Loading in Collegiate Male Volleyball Players
The purpose of this study was to investigate the benefit of post-activation performance enhancement (PAPE) after accentuated eccentric loading (AEL) compared to traditional resistance loading (TR). Sixteen male volleyball athletes were divided in AEL and TR group. AEL group performed 3 sets of 4 repetitions (eccentric: 105% of concentric 1RM, concentric: 80% of concentric 1RM) of half squat, and TR group performed 3 sets of 5 repetitions (eccentric & concentric: 85% of 1RM). Countermovement jump (CMJ), spike jump (SPJ), isometric mid-thigh pull (IMTP), and muscle soreness test were administered before (Pre) exercise, and 10 min (10-min), 24 h (24-h), and 48 h (48-h) after exercise. A two-way repeated measures analysis of variance was used to analyze the data. Peak force and rate of development (RFD) of IMTP in AEL group were significantly greater (p 0.05) groups x time. AEL seemed capable to maintain force production in IMTP, but not in CMJ and SPJ. It is recommended the use of accentuated eccentric loading protocols to overcome the fatigue
- …