检索结果-南通市图书馆

Implication of Sensitive Reactions to Ignition of Methyl Pentanoate:H-Abstraction Reactions by H and CH_(3) Radicals

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2021年第3期37卷 711-717页

作者： shang yanlei NING Hongbo SHI Jinchun LUO S.N. Key Laboratory of Advanced Technologies of Materials Ministry of EducationSouthwest Jiaotong UniversityChengdu610031P.R.China The Peac Institute of Multiscale Sciences Chengdu610027P.R.China

Methyl pentanoate(MP)was identified as a potential *** facilitate the application of MP with high efficiency in engines,a comprehensive understanding of combustion chemical kinetics of MP is *** this work,the H-abstraction reactions from MP by H and CH_(3) radicals,critical in controlling the initial fuel consumption,are theoretically investigated at the DLPNO-CCSD(T)/CBS(T-Q)//M06-2X/cc-pVTZ level of *** multistructural torsional(MS-T)anharmonicity is characterized using the dual-level MS-T method;the HF/3-21G and M06-2X/cc-pVTZ methods are chosen as the low-and high-level methods,*** conventional transition state theory(TST)is employed to calculate the high-pressure limit rate constants at 298-2000 K with the Eckart tunneling *** calculations indicate that the hydrogen atoms of the methylene functional group are easier to be abstracted by H and CH_(3) *** multistructural torsional anharmonicities of H-abstraction reactions MP+H/CH_(3) are significant within the temperature range *** tunneling effects are more pronounced at low temperatures,and contribute considerably to the rate constants below 500 *** model from the work of Diévart et *** updated with our calculations,and the simulations of the updated model are in excellent agreement with the reported ignition delay time of MP/O2/Ar and MP/Air *** sensitivity analysis indicates that the H-abstraction reactions,MP+H-CH_(3)CH_(2)CHCH_(2)C(-O)OCH_(3)/CH_(3)CHCH_(2)CH_(2)C(-O)OCH_(3)+H2,are critical in controlling the initial fuel consumption and ignition delay time of MP.

关键词： Methyl pentanoate H-Abstraction Dual-level MS-T Ignition delay time Kinetic modeling

ScaleLK: Registration of Point Clouds with Different Scales Using Deep Learning Methods

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

ScaleLK: Registration of Point Clouds with Different Scales ...

第三届材料科学应用与能源材料国际研讨会

作者： Shuai Xu yanlei shang Institute of Network Technology Beijing University of Posts and Telecommunications

3D point clouds are widely used in numerous research and applications, such as autonomous driving, industrial robots, and augmented reality, to represent the spatial structure of objects. The 3D point cloud registration aims to transform the source point cloud into the same coordinate system with the template point cloud, which is of great significance for the 3D reconstruction of the real world objects. ICP [1] is one of the most classic point cloud registration algorithms but it still has problems with efficiency and initialization. With the help of deep learning, PointNetLK [7] becomes a state-of-the-art point cloud registration method. Although PointNetLK is efficient and robust to some extent, it is not able to register point clouds with different scales. In this paper, we propose ScaleLK, an approach for registration of point clouds with different scales using deep learning methods. We have trained a feature extractor which supports scale feature and used this feature for registration of point clouds with different scales. We describe the architecture and compare its performance with other methods.

关键词：

An adaptive hierarchical transmission mechanism of 3D models for mobile terminals

在线全文

cnki会议

学校读者我要写书评

暂无评论

An adaptive hierarchical transmission mechanism of 3D models...

第三届材料科学应用与能源材料国际研讨会

作者： Chen Wei yanlei shang Institute of network technology Beijing University of Posts and Telecomminications

An adaptive hierarchical transmission mechanism of 3D mesh models for mobile terminals based on WebAR technology is introduced. By proposing a vertex merging algorithm based on vertex megring degree, the original model is decomposed into multiple groups of data consist of a simplified model and a layer file for reconstruction according to the specific compression ratio. The experiments show that the initialization time of the AR scene using the simplified model as the base model is effectively reduced and the simplified model can be reconstructed to the original model losslessly with the layer file. The proposed mechanism can be used for adaptive transmission, lossless reconstruction and real-time rendering on mobile terminals.

关键词：

Designing of New Data Synchronization System

在线全文

cnki会议

学校读者我要写书评

暂无评论

Communications and Network 2013年第1期5卷 49-54页

作者： Jinbin Yang Jianping Zheng yanlei shang Junliang Chen The State Key Lab of Networking and Switching Beijing University of Posts and Telecommunications Beijing China

As the rapid development of Wireless Communications and the popularity of the Intelligent Terminal, data synchronization has been a social focus, meanwhile, user terminal devices are increasingly diversified, traditional synchronization technology based C/S mode has such deficiencies as insufficient amount of transmitting data and bad Real-time efficiency. It has become increasingly unable to meet the needs of future development. In this paper, we proposed and designed a new method and system by separating control with transmission to synchronize data to ensure Real-time data and improve efficiency.

关键词： Mobile Internet Wireless Communications Data Synchronization Control Transmission

Hierarchical neural network for facial attribute transfer

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

Hierarchical neural network for facial attribute transfer

第三届材料科学应用与能源材料国际研讨会

作者： You Guo yanlei shang Xiaofang Zhang Institute of network technology Beijing University of Posts and Telecommunications School of Electrical Engineering Beijing Jiaotong University

The facial attribute transfer refers to generating a face image with desired attributes while preserving other details. In the existing methods, some of the them consider the independence among attributes but neglect the integrity. It may result in information loss and lead to distorted generation. The others ensure the integrity at the cost of insufficient independence limits. The generated images will be partially blurred. In this paper, GAN and Variational Autoencoders（VAE） structure are incorporated to preserve the details while attribute transfer occurs. The concept of hierarchical latent representation is introduced to realize the attribute independence. These methods work with each other forming an effective network for facial attribute transfer, referred as Hi-GAN. Experiments on the CelebA dataset show that our model can output clearer and more realistic images on facial attribute transfer.

关键词：

Comprehensively Context-Aware Approach to Guaranteeing Multimedia Conferencing Services

在线全文

cnki会议

学校读者我要写书评

暂无评论

China Communications 2013年第9期10卷 53-64页

作者：吴冀衍田岳程渤商彦磊 State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications

Service-Oriented Communication(SOC)is a key research issue to enable media communications using the Service-Oriented Architecture(SOA).Motivated by the necessity to guarantee the service quality of our webbased multimedia conferencing system,we present a Comprehensively Context-Aware(CoCA)approach in this *** major problem in the existing end-to-end Quality of Service(QoS)management solutions is that they analyse and exploit the relationships between the QoS metrics and corresponding contexts in an isolated *** this paper,we propose a novel approach to leveraging such relationships in a comprehensive manner based on Bayesian networks and the fuzzy set *** approach includes three phases:1)information feedback and training,2)QoS-to-context mapping,and3)optimal context *** implement the proposed CoCA in the real multimedia conferencing system and compare its performance with the existing bandwidth aware and playback buffer aware *** results show that the proposed CoCA outperforms the competing approaches in improving the average video Peak Signal-to-Noise Ratio(PSNR).It also exhibits good performance in preventing the playback buffer starvation.

关键词： SOC multimedia conferencing context-aware

A Novel Hierarchical Packet Fair Scheduling Model

在线全文

学校读者我要写书评

暂无评论

A Novel Hierarchical Packet Fair Scheduling Model

2003 International Conference on Communication Technology

作者： shang yanlei Zhao Lifen Liu Ju School of Information Science and Engineering Shandong University Jinan China Montse Nájar Department of Signal Theory and Communications Universitat Politècnica de Catalunya Barcelona Spain

In this paper, a novel hierarchical packet fair scheduling model is proposed based on J. Bennett and H. Zhang scheduling model. The soft-QoS traffics introduced in this new model together with hard-Qo

关键词： packet scheduling soft-QoS traffics QoS

Effects of carbon content on the microstructure and tensile properties of a low-density steel

在线全文

cnki会议

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 391-401页

作者： Yongxuan shang Mingyu Fan Shuyong Jiang Zhongwu Zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Metal Material for Marine Equipment and Application Iron&Steel Research Institute of Ansteel Group CorporationAnshan 114009China

Carbon can change the phase components of low-density steels and influence the mechanical *** this study,a new method to control the carbon content and avoid the formation ofδ-ferrite by decarburization treatment was *** microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically ***-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile *** decarburization by heat treatments,the carbon content within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual ***,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the *** addition,the formation of other carbides *** loss induced a decrease in strength due to the weakening of the carbon solid *** the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of *** the dual-phase steel,the deformation occurred by the dislocation planar glide of austenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in *** the late stage of deformation,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.

关键词： low-density steels carbon content decarburization strengthening mechanisms work hardening behavior

Unraveling the significance of cobalt on transformation kinetics,crystallography and impact toughness in high-strength steels

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 380-390页

作者： Yishuang Yu Jingxiao Zhao Xuelin Wang Hui Guo Zhenjia Xie Chengjia shang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work reveals the significant effects of cobalt(Co)on the microstructure and impact toughness of as-quenched highstrength steels by experimental characterizations and thermo-kinetic *** results show that the Co-bearing steel exhibits finer blocks and a lower ductile-brittle transition temperature than the steel without ***,the Co-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to *** improved impact toughness of the Co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant ***,the addition of Co induces a larger transformation driving force and a lower bainite start temperature(BS),thereby contributing to the refinement of blocks and the increase of the V1/V2 variant *** findings would be instructive for the composition,microstructure design,and property optimization of high-strength steels.

关键词： high-strength steel cobalt transformation kinetics crystallography impact toughness