5,508 research outputs found
Transition magnetic moment of Majorana neutrinos in the SSM
The nonzero vacuum expectative values of sneutrinos induce spontaneously
R-parity and lepton number violation, and generate three tiny Majorana neutrino
masses through the seesaw mechanism in the SSM, which is one of
Supersymmetric extensions beyond Standard Model. Applying effective Lagrangian
method, we study the transition magnetic moment of Majorana neutrinos in the
model here. Under the constraints from neutrino oscillations, we consider the
two possibilities on the neutrino mass spectrum with normal or inverted
ordering.Comment: 20 pages, 2 figures, accepted for publication in JHEP. arXiv admin
note: text overlap with arXiv:1305.4352, arXiv:1304.624
Structured Domain Adaptation with Online Relation Regularization for Unsupervised Person Re-ID
Unsupervised domain adaptation (UDA) aims at adapting the model trained on a
labeled source-domain dataset to an unlabeled target-domain dataset. The task
of UDA on open-set person re-identification (re-ID) is even more challenging as
the identities (classes) do not overlap between the two domains. One major
research direction was based on domain translation, which, however, has fallen
out of favor in recent years due to inferior performance compared to
pseudo-label-based methods. We argue that translation-based methods have great
potential on exploiting the valuable source-domain data but they did not
provide proper regularization on the translation process. Specifically, these
methods only focus on maintaining the identities of the translated images while
ignoring the inter-sample relation during translation. To tackle the challenge,
we propose an end-to-end structured domain adaptation framework with an online
relation-consistency regularization term. During training, the person feature
encoder is optimized to model inter-sample relations on-the-fly for supervising
relation-consistency domain translation, which in turn, improves the encoder
with informative translated images. An improved pseudo-label-based encoder can
therefore be obtained by jointly training the source-to-target translated
images with ground-truth identities and target-domain images with pseudo
identities. In the experiments, our proposed framework is shown to outperform
state-of-the-art methods on multiple UDA tasks of person re-ID. Code is
available at https://github.com/yxgeee/SDA
Aqua(2,9-dimethyl-1,10-phenanthroline-κ2 N,N′)bis(2-hydroxybenzoato-κO)manganese(II) 2,9-dimethyl-1,10-phenanthroline hemisolvate
In the asymmetric unit of the title complex, [Mn(C7H5O3)2(C14H12N2)(H2O)]·0.5C14H12N2, the MnII ion is coordinated by a bidentate 2,9-dimethyl-1,10-phenanthroline (dmphen) molecule, one water molecule and two monodentate 2-hydroxybenzoate anions in a distorted trigonal-bipyramidal geometry. The OH group of the 2-hydroxybenzoate anion is disordered over two positions with site-occupancy factors of 0.5. The asymmetric unit is completed with by an uncoordinated half-molecule of dmphen, disordered about a crystallographic twofold axis. In the crystal structure, molecules are linked into a two-dimensional framework by O—H⋯N, O—H⋯O and C—H⋯O hydrogen bonds. The packing of the structure is further stabilized by π–π stacking interactions involving dmphen molecules, with centroid–centroid separations of 3.8027 (3) and 3.6319 (3) Å
W boson mass in the NP models with extra gauge group
The precise measurement of the W boson mass is closely related to the
contributions of new physics (NP), which can significantly constrain the
parameter space of NP models, particularly those with an additional
local gauge group. The inclusion of a new gauge boson and gauge couplings
in these models can contribute to the oblique parameters , , and W
boson mass at tree level. Taking into account the effects of kinetic mixing, we
calculate and analyze the oblique parameters , , and W boson mass in
such NP models in this study. It is found that the kinetic mixing effects can
make significant contributions to the W boson mass, which can satisfy the
recently measured W boson mass at CDF II or ATLAS by choosing appropriate
values of gauge coupling constants and extra group charges of leptons or
scalar doublets. In addition, if the leptonic Yukawa couplings are invariant
under the extra local gauge group, these contributions can be eliminated
by redefining the gauge boson fields through eliminating the neutral currents
involving charged leptons, even with nonzero kinetic mixing effects.Comment: 11 pages, 2 figure
Aggregate Interference Modeling in Cognitive Radio Networks with Power and Contention Control
In this paper, we present an interference model for cognitive radio (CR)
networks employing power control, contention control or hybrid power/contention
control schemes. For the first case, a power control scheme is proposed to
govern the transmission power of a CR node. For the second one, a contention
control scheme at the media access control (MAC) layer, based on carrier sense
multiple access with collision avoidance (CSMA/CA), is proposed to coordinate
the operation of CR nodes with transmission requests. The probability density
functions of the interference received at a primary receiver from a CR network
are first derived numerically for these two cases. For the hybrid case, where
power and contention controls are jointly adopted by a CR node to govern its
transmission, the interference is analyzed and compared with that of the first
two schemes by simulations. Then, the interference distributions under the
first two control schemes are fitted by log-normal distributions with greatly
reduced complexity. Moreover, the effect of a hidden primary receiver on the
interference experienced at the receiver is investigated. It is demonstrated
that both power and contention controls are effective approaches to alleviate
the interference caused by CR networks. Some in-depth analysis of the impact of
key parameters on the interference of CR networks is given via numerical
studies as well.Comment: 24 pages, 8 figures, submitted to IEEE Trans. Communications in July
201
Influences of planetary gear parameters on the dynamic characteristics – a review
Planetary gear trains (PGTs) are widely used in the field of mechanical transmission. PGTs significantly differ from fixed-axis gear trains and exhibit unique dynamic behavior. Dynamic characteristics of PGTs are popular research topic, particularly when attempting to solve the problem of vibration noise. Moreover, the effects of the planetary gear parameters on the dynamic characteristics are paramount important. And significant researches have been conducted in this field. However, few reviews regarding these studies have been published. In this paper, the effects of certain parameters, which include mesh phase difference, geometric errors (tooth profile error, eccentricity error and misalignment), tooth profile modification, mesh stiffness, and etc., on the dynamic characteristics of PGTs are summarized. Several conclusions obtained can be used for the PGTs design and dynamic characteristics analysis. Finally, the potential research trends are pointed out
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