检索结果-南通市图书馆

STRNet:Triple-stream Spatiotemporal Relation Network for Action Recognition

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2021年第5期18卷 718-730页

作者： Zhi-Wei Xu xiao-jun Wu Josef Kittler School of Artificial Intelligence and Computer Science Jiangnan UniversityWuxi 214122China Jiangsu Provincial Engineering Laboratory of Pattern Recognition and Computational Intelligence Wuxi 214122China Centre for Vision Speech and Signal ProcessingUniversity of SurreyGuildfordGU27XHUK

Learning comprehensive spatiotemporal features is crucial for human action recognition. Existing methods tend to model the spatiotemporal feature blocks in an integrate-separate-integrate form, such as appearance-and-relation network(ARTNet) and spatiotemporal and motion network(STM). However, with blocks stacking up, the rear part of the network has poor interpretability. To avoid this problem, we propose a novel architecture called spatial temporal relation network(STRNet), which can learn explicit information of appearance, motion and especially the temporal relation information. Specifically, our STRNet is constructed by three branches,which separates the features into 1) appearance pathway, to obtain spatial semantics, 2) motion pathway, to reinforce the spatiotemporal feature representation, and 3) relation pathway, to focus on capturing temporal relation details of successive frames and to explore long-term representation dependency. In addition, our STRNet does not just simply merge the multi-branch information, but we apply a flexible and effective strategy to fuse the complementary information from multiple pathways. We evaluate our network on four major action recognition benchmarks: Kinetics-400, UCF-101, HMDB-51, and Something-Something v1, demonstrating that the performance of our STRNet achieves the state-of-the-art result on the UCF-101 and HMDB-51 datasets, as well as a comparable accuracy with the state-of-the-art method on Something-Something v1 and Kinetics-400.

关键词： Action recognition spatiotemporal relation multi-branch fusion long-term representation video classification

Efficient Computational Method for the Non-Probabilistic Reliability of Linear Structural Systems

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2016年第3期29卷 284-299页

作者： Ruixing Wang xiao jun Wang Lei Wang Xianjia Chen Institute of Solid Mechanics Beihang University

The non-probabilistic reliability in higher dimensional situations cannot be calcu- lated efficiently using traditional methods, which either require a large amount of calculation or cause significant error. In this study, an efficient computational method is proposed for the cal- culation of non-probabilistic reliability based on the volume ratio theory, specificMly for linear structural systems. The common expression for non-probabilistic reliability is obtained through formula derivation with the amount of computation considerably reduced. The compatibility be- tween non-probabilistic and probabilistic safety measures is demonstrated through the Monte Carlo simulation. The high efficiency of the presented method is verified by several numerical examples.

关键词： non-probabilistic reliability linear structural system formula derivation compatibility high efficiency

A Practical Approach to Synthesize Multi-channel Fiber Bragg Grating with Right-Angled Triangular Spectrum

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第11期29卷 98-101页

作者： YU Xue-Lian YAO Yong xiao jun-jun TIAN Jia-jun School of Electronic and Information Engineering Shenzhen Graduate SchoolHarbin Institute of TechnologyShenzhen 518055 Department of Optics Information Science and Technology Harbin University of Science and TechnologyHarbin 150080

A novel approach is proposed towards the design of fiber Bragg gratings with multi-channel right-angled triangular ***,a single-channel grating is synthesized utilizing an adaptive quantum particle swarm optimization with the piecewise constant mutated ***,the reflectivity spectrum with good linear edge for a short grating is ***,for its merits of easy fabrication,the superposition method is adopted to design multi-channel gratings with initial spectral ***,this distortion is optimized by the method in the first *** is shown that the design outcomes still retain the features of easy fabrication and short *** gratings would be useful as wavelength-interrogation devices with multiple physical parameters in optical sensor systems.

关键词： channel Angle utilizing

COX-2 expression in gastric cancer and its relationship with angiogenesis using tissue microarray

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第25期13卷 3466-3471页

作者： xiao-Yun Mao xiao-Ge Wang xiao-jun Lv Lei Xu Cheng-Bo Han The Fourth Affiliated Hospital China Medical University Shcnyang 11000 LiaoningProvince China Liaoning Province Tumor Hospital Shenyang 110000 Liaoning Province China Department of Oncology Sheng Jing HospitalChina Medical University Shenyang 110022 Liaoning ProvinceChina

AIM: To explore the expression and clinicopathological significance of cyclooxygenase-2 (COX-2) and microvessel density (MVD) in gastric carcinogenesis, and to investigate their roles in the invasion and the relationship between biological behaviors and prognosis of gastric cancer. METHODS: Using Envision immunohistochemistry, COX-2 and CD34 expressions in gastric cancer tissue array were examined. MVD was counted and the relationship between the biological behaviors and prognosis was analyzed. RESULTS: The expression of COX-2 in gastric cancer tissue was significantly higher than that in normal mucosa (χ2 = 12.191, P < 0.05). The over-expression of COX-2 in gastric cancer was obviously related to metastasis and depth of invasion (χ2 = 6.315, P < 0.05), but not related to the histological type and Borrmann type (χ2 = 5.391 and χ2 = 2.228, respectively). Moreover, MVD in gastric cancer tissues was significantly higher than that in the normal mucosa (65.49 ± 20.64 vs 36.21 ± 18.47, t/F = 7.53, P < 0. 05). MVD was related to the histologic type and metastasis (t/F = 3.68 and t/F = 4.214, respectively, P < 0. 05), but not related to the depth of invasion and Borrmann type (t/F = 0.583 and t/F = 0.459, respectively). MVD in COX-2-positive tissues was markedly higher compared to COX-2-negative tissues, indicating a positive correlation between COX-2 expression and MVD (t = 13.12, P < 0. 05). CONCLUSION: Tissue microarray (TMA) is a powerful tool for rapid identifi cation of the molecular alterations in gastric cancer. COX-2 expression, via inducingangiogenesis, may play an important role in gastric carcinogenesis. It could be served as a determinant factor for clinical prognosis and curative effect.

关键词： Gastric cancer Tissue microarray COX-2 Immunohistochemistry CD34 Microvessel density

Solution of general dynamic equation for nanoparticles in turbulent flow considering fluctuating coagulation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2016年第10期37卷 1275-1288页

作者： Jianzhong LIN xiao jun PAN Zhaoqin YIN xiaoke KU State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Institute of Fluid Mechanics China Jiliang University

A new averaged general dynamic equation （GDE） for nanoparticles in the turbulent flow is derived by considering the combined effect of convection, Brownian diffusion, turbulent diffusion, turbulent coagulation, and fluctuating coagulation. The equation is solved with the Taylor-series expansion moment method in a turbulent pipe flow. The experiments are performed. The numerical results of particle size distribu- tion correlate well with the experimental data. The results show that, for a turbulent nanoparticulate flow, a fluctuating coagulation term should be included in the averaged particle GDE. The larger the Schmidt number is and the lower the Reynolds number is, the smaller the value of ratio of particle diameter at the outlet to that at the inlet is. At the outlet, the particle number concentration increases from the near-wall region to the near-center region. The larger the Schmidt number is and the higher the Reynolds num- ber is, the larger the difference in particle number concentration between the near-wall region and near-center region is. Particle polydispersity increases from the near-center region to the near-wall region. The particles with a smaller Schmidt number and the flow with a higher Reynolds number show a higher polydispersity. The degree of particle polydispersity is higher considering fluctuating coagulation than that without considering fluctuating coagulation.

关键词： nanoparticle general dynamic equation (GDE) fluctuating coagulation term particle distribution turbulent pipe flow

Deciphering spike architecture formation towards yield improvement in wheat

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2023年第11期50卷 835-845页

作者： Xumei Luo Yiman Yang Xuelei Lin jun xiao Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Nanjing Agricultural University NanjingJiangsu 210095China CAS-JIC Centre of Excellence for Plant and Microbial Science(CEPAMS) Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China

Wheat is the most widely grown crop globally,providing 20%of the daily consumed calories and protein content around the *** the growing global population and frequent occurrence of extreme weather caused by climate change,ensuring adequate wheat production is essential for food *** archi-tecture of the inflorescence plays a crucial role in determining the grain number and size,which is a key trait for improving *** advances in wheat genomics and gene cloning techniques have improved our understanding of wheat spike development and its applications in breeding ***,we summarize the genetic regulation network governing wheat spike formation,the strategies used for identifying and studying the key factors affecting spike architecture,and the progress made in breeding ***,we highlight future directions that will aid in the regulatory mechanistic study of wheat spike determination and targeted breeding for grain yield improvement.

关键词： Bread wheat Inflorescence architecture Genetic regulation network Breeding Grain yield

Wrinkle analysis of a space planar film reflect-array

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第1期12卷 24-32页

作者： Wei-wei xiao Wu-jun CHEN Gong-yi FU Space Structures Research Centre Shanghai Jiao Tong University Shanghai 200030 China

The presence of wrinkles in a membrane is the main factor that induces surface errors on space planar film reflect-arrays. Based on the commercial finite element (FE) package ABAQUS, a numerical procedure for membrane wrinkle analysis was set up, and used to analyze a square planar film reflect-array under pure shear force to evaluate its induced wrinkle characteristics. First, the effect of shear force on the wrinkle pattern of the array was studied and validated by experiment. Second, the effect of prestress was studied. When the prestress increases, the quantity of the wrinkles increases, and the amplitude of the wrinkles decreases. Third, the influence of the boundary conditions was investigated. A frame side edge structure has a relatively smooth surface, but also relatively high stress. Finally, the behavior of a joint seam was analyzed. The results indicate that a joint band has a significant influence on the wrinkle pattern of the membrane.

关键词： Space planar film reflect-array Wrinkle analysis Joint seam

Application of multiwalled carbon nanotubes treated by potassium permanganate for determination of trace cadmium prior to flame atomic absorption spectrometry

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2007年第10期19卷 1266-1271页

作者： xiao jun-ping ZHOU Qing-xiang BAI Hua-hua Department of Chemistry University of Science and Technology Beijing Beijing 100083 China Henan Key Laboratory for Environmental Pollution Control School of Chemistry and Environmental Sciences Henan Normal University Xinxiang 453007 China

In this study we investigated the enrichment ability of oxidized multiwalled carbon nanotubes （MWCNTs） and established a new method for the determination of trace cadmium in environment with flame atomic absorption spectrometry. The MWCNTs were oxidized by potassium permanganate under appropriate conditions before use as preconcentration packing. Parameters influencing the recoveries of target analytes were optimized. Under optimal conditions, the target analyte exhibited a good linearity （R^2=0.9992） over the concentration range 0.5-50 ng/ml. The detection limit and precision of the proposed method were 0.15 ng/ml and 2.06%, respectively. The proposed method was applied to the determination of cadmium in real-world environmental samples and the recoveries were in the range of 91.3%-108.0%. All these experimental results indicated that this new procedure could be applied to the determination of trace cadmium in environmental waters.

关键词： multiwalled carbon nanombes (MWCNTs) solid-phase extraction flame atomic absorption spectrometry

NANOFIBROUS MATS WITH BIRD'S NEST PATTERNS BY ELECTROSPINNING

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2012年第1期30卷 130-137页

作者： Xiang-yu Ye xiao-jun Huang Zhi-kang Xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

Electrospun material with bio-inspired ordered architectures and patterns is very interesting,yet remains a *** report here that nanofibrous mats with bird＇s nest patterned structures can be directly electrospun from chlorinated polypropylene solutions doped with an ionic *** solution viscosity and the ionic liquid content are two dominant factors to influence the topological morphology of the nanofibrous *** patterned structures can be further modulated by the collection time of electrospinning,the humidity of environment and the design of *** suggest the electrostatic repulsion between the residual charges of the mat surface and the upcoming nanofibers plays a key role in the formation of the bird＇s nest patterns.

关键词： Electrospinning Ionic liquid Patterned structures