14,110 research outputs found
Dirac nodal line metal for topological antiferromagnetic spintronics
Topological antiferromagnetic (AFM) spintronics is an emerging field of
research, which exploits the N\'eel vector to control the topological
electronic states and the associated spin-dependent transport properties. A
recently discovered N\'eel spin-orbit torque has been proposed to electrically
manipulate Dirac band crossings in antiferromagnets; however, a reliable AFM
material to realize these properties in practice is missing. Here, we predict
that room temperature AFM metal MnPd allows the electrical control of the
Dirac nodal line by the N\'eel spin-orbit torque. Based on first-principles
density functional theory calculations, we show that reorientation of the
N\'eel vector leads to switching between the symmetry-protected degenerate
state and the gapped state associated with the dispersive Dirac nodal line at
the Fermi energy. The calculated spin Hall conductivity strongly depends on the
N\'eel vector orientation and can be used to experimentally detect the
predicted effect using a proposed spin-orbit torque device. Our results
indicate that AFM Dirac nodal line metal MnPd represents a promising
material for topological AFM spintronics
First principles calculation of lithium-phosphorus co-doped diamond
We calculate the density of states (DOS) and the Mulliken population of the
diamond and the co-doped diamonds with different concentrations of lithium (Li)
and phosphorus (P) by the method of the density functional theory, and analyze
the bonding situations of the Li-P co-doped diamond thin films and the impacts
of the Li-P co-doping on the diamond conductivities. The results show that the
Li-P atoms can promote the split of the diamond energy band near the Fermi
level, and improve the electron conductivities of the Li-P co-doped diamond
thin films, or even make the Li-P co-doped diamond from semiconductor to
conductor. The effect of Li-P co-doping concentration on the orbital charge
distributions, bond lengths and bond populations is analyzed. The Li atom may
promote the split of the energy band near the Fermi level as well as may
favorably regulate the diamond lattice distortion and expansion caused by the P
atom.Comment: 14 pages, 11 figure
Identification of a novel TSC2 c.3610G > A, p.G1204R mutation contribute to aberrant splicing in a patient with classical tuberous sclerosis complex: a case report
Background: Tuberous sclerosis complex (TSC) is an autosomal dominant disorder characterized by hamartomas in
any organ systems. Mutations in the TSC1 or TSC2 gene lead to the dysfunction of hamartin or tuberin proteins,
which cause tuberous sclerosis complex.
Case presentation: We describe the clinical characteristics of patients from a Chinese family with tuberous sclerosis
complex and analyze the functional consequences of their causal genetic mutations. A novel heterozygous mutation
(c.3610G > A) at the last nucleotide of exon 29 in TSC2 was identified. On the protein level, this variant was presumed
to be a missense mutation (p.Gly1204Arg). However, the splicing assay revealed that this mutation also leads to the
whole TSC2 exon 29 skipping, besides the wild-type transcript. The mutated transcript results in an in-frame deletion of
71 amino acids (p.Gly1133_Thr1203del) and its ratio with the normal splice product is of about 44:56.
Conclusions: The novel c.3610G > A TSC2 mutation was identified in association with tuberous sclerosis complex. And
it was proven to code both for a missense-carrying transcript (56%), and for an isoform lacking exon 29 (44%)
Multiquadrics collocation method for transient eddy current problems
This paper presents the multiquadrics collocation method (MQCM) for transient eddy current problems. Both the implicit scheme and Crank-Nicolson time matching scheme are used here for time discretization. An example on analyzing transient eddy current of a square metal column is illustrated to prove the accuracy and affectivity of the proposed method. © 2006, IEEE. All rights reserved
Repetitive Activity Counting by Sight and Sound
This paper strives for repetitive activity counting in videos. Different from
existing works, which all analyze the visual video content only, we incorporate
for the first time the corresponding sound into the repetition counting
process. This benefits accuracy in challenging vision conditions such as
occlusion, dramatic camera view changes, low resolution, etc. We propose a
model that starts with analyzing the sight and sound streams separately. Then
an audiovisual temporal stride decision module and a reliability estimation
module are introduced to exploit cross-modal temporal interaction. For learning
and evaluation, an existing dataset is repurposed and reorganized to allow for
repetition counting with sight and sound. We also introduce a variant of this
dataset for repetition counting under challenging vision conditions.
Experiments demonstrate the benefit of sound, as well as the other introduced
modules, for repetition counting. Our sight-only model already outperforms the
state-of-the-art by itself, when we add sound, results improve notably,
especially under harsh vision conditions
Numerical Study on Indoor Wideband Channel Characteristics with Different Internal Wall
Effects of material and configuration of the internal wall on the performance of wideband channel are investigated by using the Finite Difference Time-Domain (FDTD) method. The indoor wideband channel characteristics, such as the path-loss, Root-Mean-Square (RMS) delay spread and number of the multipath components (MPCs), are presented. The simulated results demonstrate that the path-loss and MPCs are affected by the permittivity, dielectric loss tangent and thickness of the internal wall, while the RMS delay spread is almost not relevant with the dielectric permittivity. Furthermore, the comparison of simulated result with the measured one in a simple scenario has validated the simulation study
Massive charged particle's tunneling from spherical charged black hole
We generalize the Parikh-Wilczek scheme to the tunneling of a massive charged
particle from a general spherical charged black hole. We obtain that the
tunneling probability depends on the energy, the mass and the charge of the
particle. In particular, the modified Hawking temperature is related to the
charge. Only at the leading order approximation can the standard Hawking
temperature be reproduced. We take the Reissner-Nordstr\"{o}m black hole as an
example to clarify our points of view, and find that the accumulation of
Hawking radiation makes it approach an extreme black hole.Comment: 10 pages, no figures; v2: a minor typo corrected; v3: 11 pages,
clarification and reference added, final version to be published in EPL; v4:
minor modifications to match the published versio
The potential of the human immune system to develop broadly neutralizing HIV-1 antibodies: implications for vaccine development
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