检索结果-南通市图书馆

Single-view facial reflectance inference with a differentiable renderer

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2021年第11期64卷 5-21页

作者： Jiahao GENG Yanlin WENG Lvdi WANG Kun ZHOU State Key lab of CAD&CG Zhejiang University ZJU-Face Unity Joint lab of Intelligent Graphics

We introduce a deep-learning based algorithm to infer high-fidelity facial reflectance from a single image. The algorithm uses convolutional neural networks to encode the input image into a latent representation, from which a decoder and a detail enhancing network reconstruct decoupled facial reflectance(albedo, specular, and normal) as well as the environmental lighting. These decoupled components, together with a 3 D facial mesh estimated from the image, are then fed into a differentiable renderer to produce a rendered facial image. This allows us to iteratively optimize the latent representation of the facial image by minimizing the image-space reconstruction loss. Experimental results show that optimizing the latent representation through the differentiable renderer can effectively reduce the discrepancy between the original image and the rendered one, leading to a more accurate reconstruction of characteristic facial features such as skin tone, lip color, and facial hair.

关键词： facial modeling reflectance inference differentiable renderer

SYNTHESIS OF BIMODAL POLYETHYLENE WITH UNSYMMETRICAL α-DIIMINE NICKEL COMPLEXES: INFLUENCE OF LIGAND BACKBONE AND UNSYM-SUBSTITUTED ANILINE MOIETY

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2013年第4期31卷 563-573页

作者： Hai-yang Gao Feng-shou Liu Hai-bin Hu Fang-ming Zhu 伍青 DSAPM lab PCFM LabInstitute of Polymer ScienceSchool of Chemistry and Chemical EngineeringSun Yat-Sen University

A series of unsymmetrical a-diimine nickel complexes with various backbones and substituted aniline moieties were synthesized and characterized. The crystallographic analysis of the nickel complexes confirmed the existence of meso-and rac-configuration in solid structure. Nickel complexes after activation by MAO were screened for ethylene polymerization to evaluate backbone substituent effect on synthesis of bimodal PE. Acenaphthyl nickel complex with planar backbone afforded a bimodal PE with a broad polydispersity, whereas camphyl nickel complex with rigid and bulky backbone afforded a monomodal PE with a narrow polydispersity. Steric effect of aniline moiety for acenaphthyl nickel complex was also examined, and bimodal PE with dominant high-molecular-weight fraction was obtained by modifying substituents on aniline moiety.

关键词： a-Diimine nickel Stereo-isomer Polyethylene Bimodal molecular weight distribution.

Response of ants to grazing disturbance at the central Monte Desert of Argentina: community descriptors and functional group scheme

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2014年第1期6卷 117-127页

作者： Silvia CLAVER Susana L SILNIK Florencia F CAMPóN Entomology lab IADIZA-CONICET

Livestock ranching is one of the main productive activities in arid regions of the *** produces changes in animal as well as plant communities(***,abundance and species dominance relationships).Ants are good biological indicators due to the environmental fidelity of some of their community *** described the functional structure of the ant community in the central Monte of Mendoza,Argentina,and examined the effect of grazing using richness,diversity and the functional group *** used pitfall traps to sample ants at a reserve with 30-year cattle exclusion and at an adjacent *** of the 27 recorded species showed significant differences in their abundance and two species were absent at the *** richness and diversity did not reflect these differences,functional groups *** Climate Specialists were more abundant at the ranch while Cryptic Species and Generalized Myrmicinae increased at the *** study supports the utility of the functional group scheme to study the effects of grazing disturbance in ant communities of arid regions.

关键词： ants cattle grazing functional groups richness diversity arid zones Monte Desert

Survey on rain removal from videos or a single image

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2022年第1期65卷 72-94页

作者： Hong WANG Yichen WU Minghan LI Qian ZHAO Deyu MENG School of Mathematics and Statistics Ministry of Education Key lab of Intelligent Networks and Network Security Xi'an Jiaotong University Pazhou lab

Rain can cause performance degradation of outdoor computer vision tasks. Thus, the exploration of rain removal from videos or a single image has drawn considerable attention in the field of image processing. Recently, various deraining methodologies have been proposed. However, no comprehensive survey work has yet been conducted to summarize existing deraining algorithms and quantitatively compare their generalization ability, and especially, no off-the-shelf toolkit exists for accumulating and categorizing recent representative methods for easy performance reproduction and deraining capability evaluation. In this regard, herein, we present a comprehensive overview of existing video and single image deraining methods as well as reproduce and evaluate current state-of-the-art deraining methods. In particular, these approaches are mainly classified into model-and deep-learning-based methods, and more elaborate branches of each method are presented. Inherent abilities, especially generalization performance, of the state-of-the-art methods have been both quantitatively and visually analyzed through thorough experiments conducted on synthetic and real benchmark datasets. Moreover, to facilitate the reproduction of existing deraining methods for general users, we present a comprehensive repository with detailed classification, including direct links to 85 deraining papers, 24 relevant project pages, source codes of 12 and 25 algorithms for video and single image deraining, respectively, 5 and 10 real and synthesized datasets, respectively, and 7 frequently used image quality evaluation metrics, along with the corresponding computation codes. Research limitations worthy of further exploration have also been discussed for future research along this direction.

关键词： rain removal maximum a posterior estimation deep learning generalization performance comprehensive repository

同方期刊数据库

Learning layout generation for virtual worlds

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2024年第3期10卷 577-592页

作者： Weihao Cheng Ying Shan ARC lab TencentShenzhen 518057China

The emergence of the metaverse has ledto the rapidly increasing demand for the generation ofextensive 3D worlds. We consider that an engagingworld is built upon a rational layout of multiple landuse areas (e.g., forest, meadow, and farmland). Tothis end, we propose a generative model of landuse distribution that learns from geographic *** model is based on a transformer architecturethat generates a 2D map of the land-use layout,which can be conditioned on spatial and semanticcontrols, depending on whether either one or bothare provided. This model enables diverse layoutgeneration with user control and layout expansion byextending borders with partial inputs. To generatehigh-quality and satisfactory layouts, we devise ageometric objective function that supervises the modelto perceive layout shapes and regularize generationsusing geometric priors. Additionally, we devise aplanning objective function that supervises the modelto perceive progressive composition demands andsuppress generations deviating from controls. Toevaluate the spatial distribution of the generations, wetrain an autoencoder to embed land-use layouts intovectors to enable comparison between the real andgenerated data using the Wasserstein metric, which isinspired by the Fr´echet inception distance.

关键词： layout generation virtual worlds Transformer land-use

Study of Pulsed Plasma in a Crossed Flow Dielectric Barrier Discharge Reactor for Improvement of NO_x Removal in Raw Diesel Engine Exhaust

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

Plasma Science and Technology 2011年第1期13卷 82-87页

作者： Sankarsan MOHAPATRO B.S.RAJANIKANTH High Voltage lab Indian Institute of Science

Improved performance of plasma in raw engine exhaust treatment is reported. A new type of reactor referred to as of cross-flow dielectric barrier discharge （DBD） was used, in which the gas flow is perpendicular to the corona electrode. In raw exhaust environment, the cross-flow （radial-flow） reactor exhibits a superior performance with regard to NOx removal when compared to that with axial flow of gas. Experiments were conducted at different flow rates ranging from 2 L/min to 25 L/min. The plasma assisted barrier discharge reactor has shown encouraging results in NOx removal at high flow rates.

关键词： electric discharges NOx removal, non-thermal plasma, raw diesel engine exhaust

Three-degree-of-freedom Parallel Manipulator to Track the Sun for Concentrated Solar Power Systems

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2015年第4期28卷 793-800页

作者： ASHITH SHYAM R B GHOSAL A Robotics and Design lab Indian Institute of Science

In concentrated solar power（CSP） generating stations, incident solar energy is reflected from a large number of mirrors or heliostats to a faraway receiver. In typical CSP installations, the mirror needs to be moved about two axes independently using two actuators in series with the mirror effectively mounted at a single point. A three degree-of-freedom parallel manipulator, namely the 3-RPS parallel manipulator, is proposed to track the sun. The proposed 3-RPS parallel manipulator supports the load of the mirror, structure and wind loading at three points resulting in less deflection, and thus a much larger mirror can be moved with the required tracking accuracy and without increasing the weight of the support structure. The kinematics equations to determine motion of the actuated prismatic joints in the 3-RPS parallel manipulator such that the sun＇s rays are reflected on to a stationary receiver are developed. Using finite element analysis, it is shown that for same sized mirror, wind loading and maximum deflection requirement, the weight of the support structure is between 15% and 60% less with the 3-RPS parallel manipulator when compared to azimuth-elevation or the target-aligned configurations.

关键词： 3-RPS Parallel manipulator Heliostat Solar tracking

Magnetic-Field-Induced Stress-Birefringence in Laminate Composites of Terfenol-D and Polycarbonate

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第7期30卷 233-235页

作者： LUO Xiao-Bin WU Dong ZHANG Ning Magneto-electronic lab and Key Lab of Optical-electronic Techniques of Jiangsu ProvinceNanjing Normal UniversityNanjing 210046

The laminate composites that can show the magneto-birefringence effect are suggested and fabricated by the product of magnetostriction and *** a magnetic field no stronger than 1900 Oe,a phase difference of~3.3π is observed for a trilayer composite Tb_(1-x)Dy_(x)Fe_(2-y)/polycarbonate/Tb_(1-x)Dy_(x)Fe_(2-y) with a polycarbonate layer at a size of 5×2.75×20 mm^(3) at room temperature,resulting in a half-wave magnetic field of no greater than 270 Oe.

关键词： laminate composites composite

Cyclotriphosphazene Fibre Reinforced Poly(benzoxazine-co-ε-caprolactam) Nanocomposites for Flame Retardant Applications

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 Journal of Polymer Science 2014年第8期32卷 1086-1098页

作者： M.Selvi S.Devaraju K.Sethuraman R.Revathi M.Alagar Polymer Composite lab Department of Chemical Engineering Anna University Next MEMS lab School of Mechanical Engineering Pusan National University

Cyclophosphazene nanotube （PZT） incorporated poly（benzoxazine-co-g-caprolactam）（P（BZ-co-CPL）） nano- composites were developed for improving flame retardant properties. The effects of PZT on the flammability properties of P（BZ-co-CPL） matrix were evaluated through UL-94 flammability test and limiting oxygen index （LOI）. The UL-94 results of P（BZ-co-CPL）/PZT hybrid nanocomposites showed V-1 rating, whereas neat P（BZ-co-CPL） showed burning rating. The LOI values are increased from 25.4 to 31.4 for 1.5 wt% PZT incorporated P（BZ-co-CPL） nanocomposite systems. SEM was used to study the char morphology of P（BZ-co-CPL）/PZT after being exposed to UL-94 flammability test. Data from thermal studies indicate that the PZT incorporated P（BZ-co-CPL） systems possess better Tg and thermal degradation behavior when compared to the neat P（BZ-co-CPL）. The values of dielectric constant are decreased with increasing temperature. From the values, it is ascertained that the P（BZ-co-CPL）/PZT systems exhibit stable dielectric behavior with regard to variation in temperature. The TEM images ascertain the uniform dispersion of PZT in the P（BZ-co-CPL） matrix.

关键词： Polybenzoxazine Phosphazene Flame retardant Dielectric properties.