199 research outputs found
The Post–endodontic Adhesive Interface: Theoretical Perspectives and Potential Flaws
Introduction The aim of this review was to analyze the potential of successful bonds of endodontic posts to radicular dentin as well as the limitations of the post–endodontic adhesive interface. Methods The MEDLINE/PubMed and Web of Science electronic databases were searched. The search was augmented by a manual search of the pertinent bibliographies. Results The post–endodontic adhesive interface finds application in the endodontic cohesive units. Many techniques and materials exist to improve the bond between endodontic posts and resin-based materials as well as between resin-based materials and radicular dentin. Different techniques used for the adhesion of metallic and fiber-reinforced posts are discussed and critically analyzed. Conclusions Although adhesive cementation of endodontic posts is popular, a long-term predictable bond may be compromised because of procedures related to the endodontic treatment and/or the adhesive cementation procedures. Microleakage and degradation phenomena may further jeopardize the post–endodontic adhesive interface
Depth-wise Decomposition for Accelerating Separable Convolutions in Efficient Convolutional Neural Networks
Very deep convolutional neural networks (CNNs) have been firmly established
as the primary methods for many computer vision tasks. However, most
state-of-the-art CNNs are large, which results in high inference latency.
Recently, depth-wise separable convolution has been proposed for image
recognition tasks on computationally limited platforms such as robotics and
self-driving cars. Though it is much faster than its counterpart, regular
convolution, accuracy is sacrificed. In this paper, we propose a novel
decomposition approach based on SVD, namely depth-wise decomposition, for
expanding regular convolutions into depthwise separable convolutions while
maintaining high accuracy. We show our approach can be further generalized to
the multi-channel and multi-layer cases, based on Generalized Singular Value
Decomposition (GSVD) [59]. We conduct thorough experiments with the latest
ShuffleNet V2 model [47] on both random synthesized dataset and a large-scale
image recognition dataset: ImageNet [10]. Our approach outperforms channel
decomposition [73] on all datasets. More importantly, our approach improves the
Top-1 accuracy of ShuffleNet V2 by ~2%.Comment: CVPR 2019 workshop, Efficient Deep Learning for Computer Visio
Investigation of the tetraquark states in the improved chromomagnetic interaction model
In the framework of the improved chromomagnetic interaction model, we
complete a systematic study of the -wave tetraquark states
(, and ) with different quantum numbers,
, , and . The mass spectra of tetraquark
states are predicted and the possible decay channels are analyzed by
considering both the angular momentum and -parity conservation.
The recently observed hidden-charm tetraquark states with strangeness, such as
, , and , can be well explained in our
model. Besides, based on the wave function of each tetraquark state, we find
that the low-lying states of each configuration have a large
overlap to the and meson basis, instead of and
meson basis. This indicates one can search these tetraquark states in
future experiments via the channel of and mesons.Comment: 11 pages, 9 figures, and 4 tables; accepted for publication in
Chinese Physics
Key pathways and genes controlling the development and progression of clear cell renal cell carcinoma (ccRCC) based on gene set enrichment analysis
BACKGROUND: Clear-cell renal cell carcinoma (ccRCC) is one of the most common types of kidney cancer in adults; however, its causes are not completely understood. The study was designed to filter the key pathways and genes associated with the occurrence or development of ccRCC, acquaint its pathogenesis at gene and pathway level, to provide more theory evidence and targeted therapy for ccRCC. METHODS: Gene set enrichment analysis (GSEA) and meta-analysis (Meta) were used to screen the critical pathways and genes which may affect the occurrence and progression of ccRCC on the transcription level. Corresponding pathways of significant genes were obtained with the online website DAVID (http://david.abcc.ncifcrf.gov/). RESULTS: Thirty seven consistent pathways and key genes in these pathways related to ccRCC were obtained with combined GSEA and meta-analysis. These pathways were mainly involved in metabolism, organismal systems, cellular processes and environmental information processing. CONCLUSION: The gene pathways that we identified could provide insight concerning the development of ccRCC. Further studies are needed to determine the biological function for the positive genes
Galactic Phylogenetics
Phylogenetics is a widely used concept in evolutionary biology. It is the
reconstruction of evolutionary history by building trees that represent
branching patterns and sequences. These trees represent shared history, and it
is our intention for this approach to be employed in the analysis of Galactic
history. In Galactic archaeology the shared environment is the interstellar
medium in which stars form and provides the basis for tree-building as a
methodological tool.
Using elemental abundances of solar-type stars as a proxy for DNA, we built
in Jofre et al 2017 such an evolutionary tree to study the chemical evolution
of the solar neighbourhood. In this proceeding we summarise these results and
discuss future prospects.Comment: Contribution to IAU Symposium No. 334: Rediscovering our Galax
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