检索结果-南通市图书馆

STATE:Learning structure and texture representations for novel view synthesis

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2023年第4期9卷 767-786页

作者： Xinyi Jing Qiao Feng Yu-kun Lai Jinsong Zhang Yuanqiang Yu kun li College of Intelligence and Computing Tianjin UniversityTianjin 300350China School of Computer Science and Informatics Cardiff UniversityCardiff CF244AGUK

Novel viewpoint image synthesis is very challenging,especially from sparse views,due to large changes in viewpoint and *** image-based methods fail to generate reasonable results for invisible regions,while geometry-based methods have difficulties in synthesizing detailed *** this paper,we propose STATE,an end-to-end deep neural network,for sparse view synthesis by learning structure and texture *** is encoded as a hybrid feature field to predict reasonable structures for invisible regions while maintaining original structures for visible regions,and texture is encoded as a deformed feature map to preserve detailed *** propose a hierarchical fusion scheme with intra-branch and inter-branch aggregation,in which spatio-view attention allows multi-view fusion at the feature level to adaptively select important information by regressing pixel-wise or voxel-wise confidence *** decoding the aggregated features,STATE is able to generate realistic images with reasonable structures and detailed *** results demonstrate that our method achieves qualitatively and quantitatively better results than state-of-the-art *** method also enables texture and structure editing applications benefiting from implicit disentanglement of structure and *** code is available at http://***/faculty/likun/projects/STATE.

关键词： novel view synthesis sparse views spatioview attention structure representation texture representation

Laser flashing light as a radiation source for lettuce growth

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

International Journal of Agricultural and Biological Engineering 2024年第6期17卷 86-92页

作者： kun li Ruifeng Cheng Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural ScienceBeijing 100081China Key Lab of Energy Conservation and Waste Management of Agricultural Structures Ministry of AgricultureBeijing 100081China

Relatively lower light intensity and higher energy consumption of electrical lightings in plant factories encourage people to search for new light sources and illuminating *** this study,a laser diffuse system was built to produce laser flashing light(LF)by making high-intensity red and blue light strips(light intensities were 4700 and 1200μmol/m^(2)·s,respectively)swept reciprocally in the cultivation *** growth of lettuces(Lactuca sativa ***)was employed to evaluate the feasibility and efficiency of *** results showed that LF could maintain the growth of lettuce;however,the plants in this illumination pattern showed an obvious shade avoidance response and a significant decrease in growth compared with the LED continuous illumination(LEDC)*** 32 d of growth,the leaf fresh mass in LF and LEDC were 32.9 g and 79.9 g,*** leaf area of LF was only 40%of the value in *** number,leaf width,and root length in LEDC were 40.2%,78.6%,and 124.4%higher than LF,*** the contrary,leaf length and stem length in LEDC were significantly 7.7%and 32%shorter than *** lower light intensity equivalent to continuous light(66.6μmol/m^(2)·s)in LF as well as low quantum absorption and utilization efficiency might be the main *** studies are needed to optimize the illuminating pattern related to frequency and duty ratio,based on the photosynthesis parameters of ***,the laser diffuse principle and system construction need to be improved to acquire high photon utilization efficiency and light dispersion.

关键词： laser diffusion high intensity intermittent light plant growth

Seismic AVO statistical inversion incorporating poroelasticity

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

Petroleum Science 2020年第5期17卷 1237-1258页

作者： kun li Xing-Yao Yin Zhao-Yun Zong Hai-kun lin School of Geosciences China University of Petroleum(East China)Qingdao 266580ShandongChina Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071ShandongChina

Seismic amplitude variation with offset(AVO) inversion is an important approach for quantitative prediction of rock elasticity,lithology and fluid *** Biot-Gassmann's poroelasticity,an improved statistical AVO inversion approach is *** distinguish the influence of rock porosity and pore fluid modulus on AVO reflection coefficients,the AVO equation of reflection coefficients parameterized by porosity,rock-matrix moduli,density and fluid modulus is initially derived from Gassmann equation and critical porosity *** the analysis of the influences of model parameters on the proposed AVO equation,rock porosity has the greatest influences,followed by rock-matrix moduli and density,and fluid modulus has the least influences among these model ***,a statistical AVO stepwise inversion method is implemented to the simultaneous estimation of rock porosity,rock-matrix modulus,density and fluid ***,the Laplace probability model and differential evolution,Markov chain Monte Carlo algorithm is utilized for the stochastic simulation within Bayesian *** and field data examples demonstrate that the simultaneous optimizations of multiple Markov chains can achieve the efficient simulation of the posterior probability density distribution of model parameters,which is helpful for the uncertainty analysis of the inversion and sets a theoretical fundament for reservoir characterization and fluid discrimination.

关键词： Poroelasticity AVO inversion Statistical inversion Bayesian inference Seismic fluid discrimination

Pure phase MoN: preparation by chemical-diffused permeation and enhanced conductivity with rare earth Gd

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2015年第2期34卷 137-142页

作者： Xin li Chao Gao Yu-Zhi Jiang Xi-kun li School of Materials Science and Engineering Shenyang Ligong University

MoN was prepared by rare earth Gd thermaldiffused permeation method via solid–gas interface reaction using（NH_4）_4[NiMo6O_24H_6]·7H_2O（abbreviated as NiMo6） as the precursor. Thermo-gravimetric differential thermal analysis（TG–DTA） was used to study the product＇s stability. The results of X-ray diffractometer（XRD）and X-ray photoelectron spectroscopy（XPS） indicate that a new hexagonal crystal MoN forms after the rare earth gas permeation and Gd3＋are diffused as substitution ions into the crystal lattice of MoN, and the surface valence of elemental content was measured by XPS. The conductivity results by direct current（DC） four-probe method show that MoN obtained from the Gd thermal permeation exhibits conductor character in the temperature range of 298–740 K and semiconductor behavior in 740–800 K.

关键词： Rare earth permeation MoN Conductivity Gd

Numerical prediction on the scour burial of cylinder object freely resting on the sandy seabed in the East China Sea using the DRAMBUIE model

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2014年第4期29卷 509-517页

作者： Chong-guang PANG li-qian liU kun li Institute of Oceanology Chinese Academy of Sciences Key Laboratory of Ocean Circulation and Waves Chinese Academy of Sciences University of Chinese Academy of Sciences

After experiencing 8-day combined tidal current,circulation and wave actions,scour depth surrounding cylinder object freely resting on sandy seabed in the East China Sea(ECS) in January is numerically predicted using the DRAMBUIE model designed for scour burial,which has been widely used and verified by in-situ *** the period of numerical integration,the value of time t is generally variable at every time step via the special time-stepped approach developed by this paper to eliminate the time *** tidal current velocity,wave orbital velocity and the depth-averaged circulation in the ECS have been obtained by numerical simulations with Estuarine Coastal and Ocean Model(ECOM),Simulating Waves Nearshore(SWAN) model and Regional Ocean Modeling System(ROMS) model *** control experiment and several idealized test cases on influential factors in scour depth reveal that the dominant hydrodynamic factor is tidal current in the ECS under normal weather conditions,and the impacts of shelf circulation and wave motion on local scour almost can be ignored with an exception of the Kuroshio area where the high-speed mainstream of Kuroshio *** is also indicated that in sandy sediments,the distribution of scour depth nearly follows the pattern of tidal currents,while the secondary influencing factor on scour depth appears to be grain size of sandy sediment in the *** tests on sediment grain size further testify that much finer sand is more easily scoured,and an increasing trend for scour depth with reduction of grain size is displayed due to imposed resistance of larger sized *** aspects explored by this paper,including the empirical equations in the Defense Research Agency Mine Burial Environment(DRAMBUIE) model,the accuracy of inputs and infill process can severely affect the prediction of scour depth surrounding cylinder objects freely resting on sandy seabed in the ECS.

关键词： Scour burial in sandy sediments Cylinder object Time-stepped fashion Numerical simulation The DRAMBUIE model The East China Sea

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

坚持发扬斗争精神的三重叙事理路

哈尔滨工业大学学报(社会科学版) 2025年第1期27卷 1-8页

作者：王坤丽陶文昭中国人民大学马克思主义学院北京100872 中国人民大学习近平新时代中国特色社会主义思想研究院北京100872 中国人民大学21世纪中国马克思主义研究协同创新中心北京100872

坚持发扬斗争精神作为中国式现代化的重大原则,并不是基于单一维度的斗争理念阐释,而是内含自洽证成整体性逻辑的斗争叙事展开,凝结着新征程党和国家事业发展重大问题的根本遵循。于精神叙事上,坚持发扬斗争精神表现为增强全党全国各族... 详细信息

坚持发扬斗争精神作为中国式现代化的重大原则,并不是基于单一维度的斗争理念阐释,而是内含自洽证成整体性逻辑的斗争叙事展开,凝结着新征程党和国家事业发展重大问题的根本遵循。于精神叙事上,坚持发扬斗争精神表现为增强全党全国各族人民的志气、骨气、底气,重在解决“敢不敢”斗争的问题;于实践叙事上,表现为统筹发展与安全,重在解决“会不会”斗争的问题;于目标叙事上,表现为依靠顽强斗争打开事业发展新天地,重在解决斗争成效“好不好”、斗争目标“如何实现”的问题。新时代探索坚持发扬斗争精神的内在叙事理路,既有利于从重大原则层面把握斗争精神的核心要义,也有利于进一步发扬斗争精神,为中国式现代化发展蓄力赋能。

关键词：斗争精神精神叙事实践叙事目标叙事

维普期刊数据库博看期刊

A NEW BOUNDARY CONDITION FOR RATE-TYPE NON-NEWTONIAN DIFFUSIVE MODELS AND THE STABLE MAC SCHEME

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2018年第4期36卷 605-626页

作者： kun li Youngju Lee Christina Starkey BGP R&D Center CNPC Beijing 100871 China Department of Mathematics Texas State University San Marcos TX 78666 USA

We present a new Dirichlet boundary condition for the rate-type non-Newtonian diffusive constitutive models. The newly proposed boundary condition is compared with two such well-known and popularly used boundary conditions as the pure Neumann condition and the Dirichlet condition by Sureshkumar and Beris. Our condition is demonstrated to be more stable and robust in a number of numerical test cases. A new Dirichlet boundary condition is implemented in the framework of the finite difference Marker and Cell （MAC） method. In this paper, we also present an energy-stable finite difference MAC scheme that preserves the positivity for the conformation tensor and show how the addition of the diffusion helps the energy-stability in a finite difference MAC scheme-setting.

关键词： Boundary Conditions Diffusive Complex Fluids models Positivity preserving schemes Stability of the MAC schemes

Versatile chiroptical induction/manipulation through specific solvation of ion pairs by alcohols

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

Science China Chemistry 2025年第2期 610-621页

作者： Chunhong liu Xin Chen Yanling Shen Ting Zhao Dayang Zhou kun li Jiecheng Ji Wanhua Wu Xuemei Pu Cheng Yang Key Laboratory of Green Chemistry & Technology of Ministry of Education Sichuan University Comprehensive Analysis Center ISIROsaka University

While extensive research has explored manipulating supramolecular chirality through internal and external factors, the specific solvation effect remains uncharted territory. This study synthesized ortho-functionalized pillar[5]arene（P[5]） derivatives Mn and Dn via thiol-Michael addition, characterizing them through spectroscopic and X-ray single-crystal analyses. Mn and Dn interacted with chiral amines, yielding significant circular dichroism（CD） responses. Intriguingly, the chiral induction exhibited pronounced specific solvation effects, where achiral alcohols either enhanced, attenuated, or reversed CD signals. Testing over 40 alcohols revealed correlations between the specific solvation effects and alcohol polarity and acidity. Molecular dynamics simulations unveiled that the alcohol interacted distinctly through hydrogen bonding, with one ion pair bonding up to four alcohol molecules. The Rp- and Sp-preference of the P[5] core could be altered by the number of bonded alcohols. This work uncovers the critical role of alcohol-specific solvation in ion pair-involved chiral assembly, pertinent for asymmetric ion-pairing catalysis and the use of alcohol additives in organic solvents.

关键词：

巾子峰国家森林公园常绿阔叶林木本植物优势种的生态位和种间联结性

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

浙江农林大学学报 2025年第1期42卷 45-54页

作者：李琨胡兆贵张茂付甘燕玲李苏春刘芳林海萍浙江农林大学林业与生物技术学院浙江杭州311300 浙江省庆元县庆元林场浙江庆元323805 庆元县自然资源和规划局浙江庆元323800 浙江省龙泉市林业局浙江龙泉323700

【目的】探究浙江巾子峰国家森林公园常绿阔叶林木本植物优势种的生态位和种间联结性,以期为亚热带常绿阔叶林的生态恢复和生物多样性保护提供参考。【方法】基于样地调查数据,从物种组成、生态位宽度、生态位重叠指数、生态位相似系数... 详细信息

【目的】探究浙江巾子峰国家森林公园常绿阔叶林木本植物优势种的生态位和种间联结性,以期为亚热带常绿阔叶林的生态恢复和生物多样性保护提供参考。【方法】基于样地调查数据,从物种组成、生态位宽度、生态位重叠指数、生态位相似系数、方差比率法、卡方(χ^(2))检验、Pearson相关系数和Spearman秩相关系数等方面研究了21种重要值≥1%的木本植物优势种的生态位和种间联结性。【结果】(1)浙江巾子峰国家森林公园常绿阔叶林群落中共有木本植物113种,隶属31科62属,主要有壳斗科Fagaceae、蔷薇科Rosaceae、樟科Lauraceae和杜鹃花科Ericaceae等。(2)木荷Schima superba、甜槠Castanopsis eyrei和黄山松Pinus taiwanensis的重要值与生态位宽度较大,在该群落中处于建群种,与其他木本植物优势种间具有较高的生态位重叠值和生态位相似性系数。21个木本植物优势种的生态位重叠值和生态位相似性系数集中在0.10~0.50。(3)浙江巾子峰国家森林公园常绿阔叶林木本植物优势种间总体呈显著正联结(P<0.05)。经χ^(2)检验,在210个种对中,有112个种对呈不显著正联结,49个种对呈不显著负联结,仅有2个种对呈极显著正联结(P<0.01),8个种对呈显著正联结(P<0.05).,39个种对呈无联结。Spearman秩相关检验和Pearson相关检验结果基本一致,不显著联结的种对分别占81.4%和80.0%,种间联结性较弱,正负联结比系数大于1。(4)主要优势树种间的Pearson相关系数与生态位重叠值的回归分析呈极显著正联结(P<0.01)。【结论】浙江巾子峰国家森林公园常绿阔叶林群落各物种之间竞争逐渐平衡,处于演替中期,物种丰富。

关键词：巾子峰木本植物优势种生态位种间联结回归分析