检索结果-南通市图书馆

Automatic location and semantic labeling of landmarks on 3D human body models

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2022年第4期8卷 553-570页

作者： shan luo Qitong Zhang Jieqing Feng State Key Lab of CAD&CG Zhejiang UniversityHangzhou 310058China

Landmarks on human body models are of great significance for applications such as digital anthropometry and clothing *** diversity of pose and shape of human body models and the semantic gap make landmarking a challenging *** paper,a learning-based method is proposed to locate landmarks on human body models by analyzing the relationship between geometric descriptors and semantic labels of landmarks.A shape alignmentalgorithm is proposed to align human body models to break symmetric ambiguity.A symmetry-awaredescriptor is proposed based on the structure of the human body models,which is robust to both pose and shape variations in human body *** regression algorithm is adopted to establish the correspondence between several descriptors and semantic labels of the *** and qualitative analyses and comparisons show that the proposed method can obtain more accurate landmarks and distinguish symmetrical landmarks ***,a dataset of landmarked human body models is also provided,containing 271 human body models collected from current human body datasets;each model has 17 landmarks labeled manually.

关键词： 3D human body model descriptor land-marking shape alignment

Short-time Lv transform and its application for non-linear FM signal detection

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

Journal of Systems Engineering and Electronics 2015年第6期26卷 1159-1168页

作者： shan luo Xiumei Li Guoan Bi School of Aeronautics and Astronautics University of Electronic Science and Technology of China School of Information Science and Engineering Hangzhou Normal University School of Electrical and Electronic Engineering Nanyang Technological University

A new time-frequency transform, known as short-time Lv transform （STLVT）, is proposed by applying the inverse Lv distribution to process consecutive segments of long data sequence. Compared with other time-frequency representations, the STLVT is able to achieve better energy concentration in the time-frequency domain for signals containing multiple linear and/or non-linear frequency modulated components. The merits of the STLVT are demonstrated in terms of the effects of window length and overlap length between adjacent segments on signal energy concentration in the time-frequency domain, and the required computational complexity. An application on the spectrum sensing for cognitive ratio （CR） by using a joint use of the STLVT and Hough transform （HT） is proposed and simulated.

关键词： Lv distribution time-frequency transform frequencymodulated signal spectrum sensing.

CNLPA-MVS:Coarse-Hypotheses Guided Non-Local PAtchMatch Multi-View Stereo

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2021年第3期36卷 572-587页

作者： Qitong Zhang shan luo Lei Wang Jieqing Feng State Key Laboratory of CAD&CG Zhejiang UniversityHangzhou 310058China

In multi-view stereo,unreliable matching in low-textured regions has a negative impact on the completeness of reconstructed *** the photometric consistency of low-textured regions is not discriminative under a local window,non-local information provided by the Markov Random Field(MRF)model can alleviate the matching ambiguity but is limited in continuous space with high computational *** to its sampling and propagation strategy,PatchMatch multi-view stereo methods have advantages in terms of optimizing the continuous labeling *** this paper,we propose a novel method to address this problem,namely the Coarse-Hypotheses Guided Non-Local PAtchMatch Multi-View Stereo(CNLPA-MVS),which takes the advantages of both MRF-based non-local methods and PatchMatch multi-view stereo and compensates for their defects ***,we combine dynamic programing(DP)and sequential propagation along scanlines in parallel to perform CNLPA-MVS,thereby obtaining the optimal depth and normal ***,we introduce coarse inference within a universal window provided by winner-takes-all to eliminate the stripe artifacts caused by DP and improve ***,we add a local consistency strategy based on the hypotheses of similar color pixels sharing approximate values into CNLPA-MVS for further improving ***-MVS was validated on public benchmarks and achieved state-of-the-art performance with high completeness.

关键词： 3D reconstruction multi-view stereo PatchMatch dynamic programming

Mechanisms of Solidification Structure Improvement of Ultra Pure 17 wt% Cr Ferritic Stainless Steel by Ti,Nb Addition

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

Journal of Materials Science & Technology 2011年第4期27卷 352-358页

作者： Yating shan Xinghong luo Xiaoqiang Hu Shi Liu Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The grain structures and the precipitates in the solidification microstructure of the ultra pure 17 wt% Cr ferritic stainless steels with different Ti and/or Nb micro-alloying were investigated both experimentally and theoretically. It was found by the grain structure observation that the addition of Ti or Nb to the steel reduced the grain size （D） and elongation factor （E）, and improved the equiaxed grain proportion （P） and globularity factor （￡）. Among the four steels studied, the minimum grain size and maximum equiaxed grain proportion were obtained by jointly adding both Ti and Nb to the steel. The SEM observation indicated that several kinds of precipitations, such as TiN, MC （rich in Nb）, Laves phase （Fe2Nb） and so on, formed in the corresponding steels. In addition, the results calculated using the Thermo-Calc software illustrated that TiN precipitates in the liquid at proper Ti and N contents. Meanwhile, the solidification interval （△T） was enlarged by the addition of Ti or Nb, and the effectiveness of Nb was stronger than Ti. Based on the experimental and calculation results, the mechanisms of grain refinement and increment in equiaxed grain proportion were discussed.

关键词： Ultra pure ferritic stainless steel Micro-alloying Solidification structure Titanium Niobium

Facet effects on bimetallic ZnSn hydroxide microcrystals for selective electrochemical CO_(2)reduction

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第8期9卷 1314-1320页

作者： Liu Han Cheng-wei Wang shan-shan luo Ying-tang Zhou Bing Li Ming Liu School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHeilongjiang Province150000China National Engineering Research Center for Marine Aquaculture Marine Science and Technology CollegeZhejiang Ocean UniversityZhoushanZhejiang Province316004China

Employing crystal facets to regulate the catalytic properties in electrocatalytic carbon dioxide reduction reaction(eCO_(2)RR)has been well demonstrated on electrocatalysts containing single metals but rarely explored for bimetallic ***,we synthesize ZnSn(OH)_(6)(ZSO)microcrystals(MCs)with distinct facets and investigate the facet effects in eCO_(2)*** studies and in situ Fourier Transform Infrared Spectroscopy(in situ-FTIR)reveal that ZSO MCs produce mainly C1 products of HCOOH and ***{111}facet of the ZSO MCS exhibits higher selectivity and faradaic efficiency(FE)than that of the{100}facet over a wide range of potentials(-0.9 V∼-1.3 V versus RHE).Density Functional Theory(DFT)calculations elucidate that the{111}facet is favorable to the adsorption/activation of CO_(2)molecules,the formation of intermediate in the rate-determining step,and the desorption of C1 products of CO and HCOOH molecules.

关键词： ZnSn(OH)_(6) Crystal facets Electrochemical carbon dioxide reduction C1 product Density functional theory

Numerical simulation of the impact of polymer rheology on polymer injectivity using a multilevel local grid refinement method

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2016年第1期13卷 110-125页

作者： Hai-shan luo Mojdeh Delshad Zhi-Tao Li Amir Shahmoradi Center for Petroleum and Geosystems Engineering The University of Texas at Austin

Polymer injectivity is an important factor for evaluating the project economics of chemical flood,which is highly related to the polymer *** the flow rate varies rapidly near injectors and significantly changes the polymer viscosity due to the non-Newtonian rheological behavior,the polymer viscosity near the wellbore is difficult to estimate accurately with the practical gridblock size in reservoir *** reduce the impact of polymer rheology upon chemical EOR simulations,we used an efficient multilevel local grid refinement（LGR）method that provides a higher resolution of the flows in the near-wellbore *** efficient numerical scheme was proposed to accurately solve the pressure equation and concentration equations on the multilevel grid for both homogeneous and heterogeneous reservoir *** block list and connections of the multilevel grid are generated via an efficient and extensible *** case simulation results indicate that the proposed LGR is consistent with the analytical injectivity model and achieves the closest results to the full grid refinement,which considerably improves the accuracy of solutions compared with the original *** addition,the method was validated by comparing it with the LGR module of CMG_*** polymer injectivity calculations,the LGR method is applicable for other problems in need of near-wellbore treatment,such as fractures near wells.

关键词： reservoir refinement rheology multilevel flooding viscosity permeability heterogeneous rheological porosity

A dual-mode integration framework and application to agile feedback design of launch vehicles

在线全文

学校读者我要写书评

暂无评论

International Journal of Mechanical System Dynamics 2024年第2期4卷 226-239页

作者： Wenfeng Zhang Xiaoshuang Cai Zhendong Liu shan luo Rendong Yu shanghai Institute of Aerospace System Engineering ShanghaiChina

In recent decades,the design of complex systems like launch vehicles in the aerospace industry has presented engineers with challenges that go beyond system *** such as time-to-market pressures and intricate industrial processes have underscored the increasing significance of agile design *** design is derived from the simplification of the design process and enhancing cross-domain data transmission and *** methods based on model-based system engineering have improved iteration times in system architecture design,challenges persist in cross-domain data *** to the diversity of complex system models and data,a single-mode integration method is difficult to realize the data link construction of all tools *** address this challenge,this paper proposes a dualmode data integration framework with expansibility,universality,and cost-efficiency which leverages the benefits of Remote Procedure Call and Intermediate Exchange Module,addressing the challenge of constructing cross-domain data links under single-mode *** this study,two critical requirements of the first-and second-stage separation systems,namely,weight and minimum separation gap,are selected for data feedback.A Modelica-based multiphysics simulation model is developed in MWorks;visualization and computation of the minimum gap are carried out in *** bridge the gap between domain-specific tools,Matlab and Functional Mock-up Unit modules are introduced as middleware,facilitating data feedback *** entire simulation process is orchestrated using activity diagrams in the MagicDraw *** study delves into the influence of critical design parameters,such as the initial angular velocity of separation and the thrust of the retro rocket,on the minimum separation *** provides an analysis of minimum separation gap variations under uncertain operating conditions and examines design ***,the paper highlights the signifi

关键词： data feedback dual-mode data integration FMU launch vehicle MBSE Modelica

Two New Steroidal Glycosides from Liriope muscari

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

Chinese Chemical Letters 2006年第1期17卷 31-34页

作者： Zhi Hong CHENG Tao WU Yin Long GUO Bo Yang YU luo shan XU School of Chinese Pharmacy China Pharmaceutical University Nanjing 210038 shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 Institute of Chinese Materia Mcdica Shanghai University of Traditional Chinese Medicine Shanghai 201203

Two new steroidal glycosides named Lm-4 （1） and Lm-5 （2） were isolated from the tubers of Liriope muscari. Their structures were elucidated by 1D and 2D NMR, ESI/MALDIMS techniques, and chemical methods.

关键词： Liriope muscari steroidal glycoside Lm-4 Lm-5.

A New Bibenzyl Derivative from Dendrobium moniliforme

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2002年第6期13卷 535-536页

作者： Zhi Ming BI Li YANG Zheng Tao WANG luo shan XU Guo Jun XU Department of Pharmacognosy China Pharmaceutical UniversityNanjing 210038

A new bibenzyl derivative, 3,4-dihydroxy-4,5-dimethoxy bibenzyl, was isolated from a orchid Dendrobium moniliforme. The structure elucidation and 1H,13C NMR assignments were achieved by spectroscopic method.

关键词： Orchidaceae Dendrobium moniliforme 3,4-dihydroxy-4,5-dimethoxy bibenzyl.