413 research outputs found
Panel. Faulkner and Contemporary Black Writers
Tortured and Embodied Nationalisms in Faulkner\u27s Flags in the Dust and Danticat\u27s The Dew Breaker / Natalie Aikens, University of Mississippi It Was Enough That the Name Was Written : Ledger Narratives in Edward P. Jones\u27s The Known World and Faulkner\u27s Go Down, Moses / Matthew Dischinger, Louisiana State University Census or Ledgers: A Rhetorical Strategy of Verisimilitude in Faulkner\u27s and Jones\u27s Southern Narratives / Dao Xioli, Chongqing University of Posts and Telecommunication
Cluster Contrast for Unsupervised Person Re-Identification
State-of-the-art unsupervised re-ID methods train the neural networks using a
memory-based non-parametric softmax loss. Instance feature vectors stored in
memory are assigned pseudo-labels by clustering and updated at instance level.
However, the varying cluster sizes leads to inconsistency in the updating
progress of each cluster. To solve this problem, we present Cluster Contrast
which stores feature vectors and computes contrast loss at the cluster level.
Our approach employs a unique cluster representation to describe each cluster,
resulting in a cluster-level memory dictionary. In this way, the consistency of
clustering can be effectively maintained throughout the pipline and the GPU
memory consumption can be significantly reduced. Thus, our method can solve the
problem of cluster inconsistency and be applicable to larger data sets. In
addition, we adopt different clustering algorithms to demonstrate the
robustness and generalization of our framework. The application of Cluster
Contrast to a standard unsupervised re-ID pipeline achieves considerable
improvements of 9.9%, 8.3%, 12.1% compared to state-of-the-art purely
unsupervised re-ID methods and 5.5%, 4.8%, 4.4% mAP compared to the
state-of-the-art unsupervised domain adaptation re-ID methods on the Market,
Duke, and MSMT17 datasets. Code is available at
https://github.com/alibaba/cluster-contrast
KAgF3: quasi-one-dimensional magnetism in three-dimensional magnetic ions sublattice
The electronic structure and magnetic properties of the Jahn-Teller-distorted
perovskite KAgF3 have been investigated using the full-potential linerized aug-
mented plane-wave method. It is found that KAgF3 exhibits significant
quasi-one- dimensional antiferromagnetism with the ratio of exchange constant
jJ?j (perpen- dicular to the z axis) and J (along the z axis) about 0.04,
although the sublattice of magnetic ion is three-dimensional. The strong
quasi-one-dimensional antiferromag- netism originates from the
C-antiferro-distortive orbital ordering of the Ag2+ 4d9 ions. The orbital
ordered antiferromagnetic insulating state in KAgF3 is determined by on-site
Coulomb repulsion to a large extent.Comment: 15 pages, 6 figure
Unusual Fermi Surface Sheet-Dependent Band Splitting in Sr2RuO4 Revealed by High Resolution Angle-Resolved Photoemission
High resolution angle-resolved photoemission measurements have been carried
out on Sr2RuO4. We observe clearly two sets of Fermi surface sheets near the
(\pi,0)-(0,\pi) line which are most likely attributed to the surface and bulk
Fermi surface splitting of the \beta band. This is in strong contrast to the
nearly null surface and bulk Fermi surface splitting of the \alpha band
although both have identical orbital components. Extensive band structure
calculations are performed by considering various scenarios, including
structural distortion, spin-orbit coupling and surface ferromagnetism. However,
none of them can explain such a qualitative difference of the surface and bulk
Fermi surface splitting between the \alpha and \beta sheets. This unusual
behavior points to an unknown order on the surface of Sr2RuO4 that remains to
be uncovered. Its revelation will be important for studying and utilizing novel
quantum phenomena associated with the surface of Sr2RuO4 as a result of its
being a possible p-wave chiral superconductor and a topological superconductor.Comment: 13 pages, 4 figure
Frequency and Influencing Factors of Rubber Dam Usage in Tianjin: A Questionnaire Survey
Objective. To investigate the frequency and influencing factors of rubber dam usage for endodontic procedures among general dentistry practitioners and specialized practitioners (endodontist) in Tianjin. Methods. Three hundred questionnaires were distributed among practitioners from 3 different types of medical institutions in Tianjin. Data were collected and analysed using Chi-square tests. Results. There were 63.3% of respondents who have used rubber dam (response rate 82.7%, valid response rate 76.3%). However, only 0.4% and 3.1% of them recognized using rubber dam "every time" during caries direct restoration and root canal therapy, respectively. There was no significant difference in rubber dam usage between male and female practitioners. Among the respondents, practitioners with working experience between 5 and 10 years showed the highest usage rate (76.3%), while practitioners working more than 20 years showed the lowest (53.2%). The endodontists gained the highest and the most frequent usage rate and the best rubber dam technique mastering skills. Practitioners working in those stomatological departments of general hospitals showed the lowest rubber dam usage rate. Conclusions. The prevalence of rubber dam usage in Tianjin city is still low. The practitioner's gender, years of professional experience, general or specialized field, and the type of dental setting they work for are the factors that need to be considered during making policy and executing training
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