7,376 research outputs found
Ethnic Issues in China's Northwest Frontier Regions and Its Solutions
The Northwestern Frontier of China is different from the Northwestern China in that it is only a part of the Northwestern China that is close to the border of the country. The geographic space of the northwestern frontier in different periods of Chinese history has changed with the effective governance of the Chinese central government. The ethnic issues in the northwestern frontier have their basic historical background and time and space. The types of ethnic issues in China’s northwest frontier areas are not the same, but they are basically manifested in internal socio-economic and cultural development issues and external ethnic interaction issues, as well as transnational (border) ethnic issues and ethnic religious issues, such as ethnic separatism and extreme religion. Doctrine and violent terrorism are only part of it, not all of it. To this end, it is necessary to "prescribe the right medicine" for different types of ethnic problems and formulate different effective "prescriptions" to solve ethnic problems in order to realize the "Chinese dream" of harmonious socialist ethnic relations in China
TransNFCM: Translation-Based Neural Fashion Compatibility Modeling
Identifying mix-and-match relationships between fashion items is an urgent
task in a fashion e-commerce recommender system. It will significantly enhance
user experience and satisfaction. However, due to the challenges of inferring
the rich yet complicated set of compatibility patterns in a large e-commerce
corpus of fashion items, this task is still underexplored. Inspired by the
recent advances in multi-relational knowledge representation learning and deep
neural networks, this paper proposes a novel Translation-based Neural Fashion
Compatibility Modeling (TransNFCM) framework, which jointly optimizes fashion
item embeddings and category-specific complementary relations in a unified
space via an end-to-end learning manner. TransNFCM places items in a unified
embedding space where a category-specific relation (category-comp-category) is
modeled as a vector translation operating on the embeddings of compatible items
from the corresponding categories. By this way, we not only capture the
specific notion of compatibility conditioned on a specific pair of
complementary categories, but also preserve the global notion of compatibility.
We also design a deep fashion item encoder which exploits the complementary
characteristic of visual and textual features to represent the fashion
products. To the best of our knowledge, this is the first work that uses
category-specific complementary relations to model the category-aware
compatibility between items in a translation-based embedding space. Extensive
experiments demonstrate the effectiveness of TransNFCM over the
state-of-the-arts on two real-world datasets.Comment: Accepted in AAAI 2019 conferenc
Bottom partner B' and Zb production at the LHC
Some new physics models, such as "beautiful mirrors" scenario, predict the
existence of the bottom partner . Considering the constraints from the data
for the branching ratio and the asymmetry
on the relevant free parameters, we calculate the contributions of
to the cross section and the polarization asymmetry
for production at the . We find that the bottom partner
can generate significant corrections to and , which might
be detected in near future.Comment: 15 pages, 5 figures. Version published in Phys. Lett.
Dirac fermions with plaquette interactions. III. SU(N) phase diagram with Gross-Neveu criticality and first-order phase transition
Inspired by our recent works[1, 2] of SU(2) and SU(4) Dirac fermions
subjected to plaquette interactions on square lattice, here we extend the
large-scale quantum Monte Carlo investigations to the phase digram of
correlated Dirac fermions with SU(6) and SU(8) symmetries subjected to the
plaquette interaction on the same lattice. From SU(2) to SU(8), the rich phase
diagram exhibits a plethora of emerging quantum phases such as the Dirac
semimetal, the antiferromagnetic Mott insulator, valence bond solid (VBS) and
the Dirac spin liquid and phase transitions including the Gross-Neveu chiral
transitions with emergent continuous symmetry, the deconfined quantum
criticality and the first order transition between interaction-driven columnar
VBS and plaquette VBS. These rich phenomena coming from the simple-looking
lattice models, firmly convey the message that the interplay between the
Dirac fermions -- with enhanced internal symmetries -- and extended
plaquette interactions -- beyond the on-site Hubbard type -- is the new
playground to synthesise novel highly entangled quantum matter both at the
model level and with experimental feasibilities.Comment: 9 pages, 7 figure
Caution on Gross-Neveu criticality with a single Dirac cone: Violation of locality and its consequence of unexpected finite-temperature transition
Lately there are many SLAC fermion investigations on the (2+1)D Gross-Neveu
criticality of a single Dirac cone [1,2]. While the SLAC fermion construction
indeed gives rise to the linear energy-momentum relation for all lattice
momenta at the non-interacting limit, the long-range hopping and its consequent
violation of locality on the Gross-Neveu quantum critical point (GN-QCP) --
which a priori requires short-range interaction -- has not been verified. Here
we show, by means of large-scale quantum Monte Carlo simulations, that the
interaction-driven antiferromagnetic insulator in this case is fundamentally
different from that on a purely local -flux Hubbard model on the square
lattice. In particular, we find the antiferromagnetic long-range order in the
SLAC fermion model has a finite temperature continuous phase transition, which
violates the Mermin-Wagner theorem, and smoothly connects to the previously
determined GN-QCP. The magnetic excitations inside the antiferromagnetic
insulator are gapped without Goldstone mode, even though the state
spontaneously breaks continuous symmetry. These unusual results
proclaim caution on the interpretation of the quantum phase transition in SLAC
fermion model as that of GN-QCP with short-range interaction
Dirac fermions with plaquette interactions. I. SU(2) phase diagram with Gross-Neveu and deconfined quantum criticalities
We investigate the ground state phase diagram of an extended Hubbard model
with -flux hopping term at half-filling on a square lattice, with unbiased
large-scale auxiliary-field quantum Monte Carlo simulations. As a function of
interaction strength, there emerges an intermediate phase which realizes two
interaction-driven quantum critical points, with the first between the Dirac
semimetal and an insulating phase of weak valence bond solid (VBS) order, and
the second separating the VBS order and an antiferromagnetic insulating phase.
These intriguing quantum critical points are respectively bestowed with
Gross-Neveu and deconfined quantum criticalities, and the critical exponents
and at deconfined quantum
critical point satisfy the CFT Bootstrap bound. We also investigate the
dynamical properties of the spin excitation and find the spin gap open near the
first transition and close at the second. The relevance of our findings in
realizing deconfined quantum criticality in fermion systems and the implication
to lattice models with further extended interactions such as those in quantum
Moir\'e systems, are discussed.Comment: 6+2 pages, 5+2 figure
Topology Optimization Method Research on Hollow Wide-chord Fan Blade of a High-bypass Turbofan Engine
AbstractIn order to realize lightweight design of a high-bypass turbofan engine, topology optimization of vacuum structure on a wide-chord fan blade was carried out regarding mixed loading conditions as static strength, vibration and bird-strike. Without changing the leaf shape, relationship of performance indices on vacuum structure was analyzed with simplified mechanical model of loading conditions. Topology optimization designs were carried out according to the highly sensitive conditions. Vacuum structure layout of fan blade was constructed integrating the major load transfer paths in each design proposal. Performance indices of different fan blade structures were compared. Result shown that optimized fan blade can realize lightweight as well as meeting the strength design requirement
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