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Deep Energies for Estimating Three-Dimensional Facial Pose and Expression

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Communications on Applied Mathematics and Computation 2024年第2期6卷 837-861页

作者： Jane Wu Michael Bao xinwei Yao Ronald Fedkiw Department of Computer Science Stanford University353 Jane Stanford WayStanfordCA 94305USA Epic Games 620 Crossroads BlvdCaryNC 27518USA

While much progress has been made in capturing high-quality facial performances using motion capture markers and shape-from-shading,high-end systems typically also rely on rotoscope curves hand-drawn on the *** curves are subjective and difficult to draw consistently;moreover,ad-hoc procedural methods are required for generating match.ng rotoscope curves on synthetic renders embedded in the optimization used to determine three-dimensional(3D)facial pose and *** propose an alternative approach whereby these curves and other keypoints are detected automatically on both the image and the synthetic renders using trained neural networks,eliminating artist subjectivity,and the ad-hoc procedures meant to mimic *** generally,we propose using mach.ne learning networks to implicitly define deep energies which when minimized using classical optimization techniques lead to 3D facial pose and expression estimation.

关键词： numerical optimization neural networks Motion capture Face tracking

Constrained docking control for shipborne UAV SideArm recovery

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ch.nese Journal of Aeronautics 2024年第5期37卷 39-59页

作者： Zikang SU Zhuolin XInG Xuebing LI ch.ntao LI xinwei WAnG Honglun WAnG College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China School of Engineering and Materials Science Queen Mary University of LondonLondon E14NSUK School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

In this work,we sought to investigate constrained docking control during shipborne SideArm recovery of an Unmanned Aerial Vehicle(UAV)under preassigned safe docking constraints,rough ocean environments,and different initial *** aim was to solve the UAV tracking-lag problem that manifests when attempting to dock with a rapidly moving SideArm and to improve the accuracy and rapidity of ***,together with the formulations of the shipborne SideArm system and environmental airflows,the affine nonlinear dynamics of the hook was established to reduce tracking ***,echo state network approximators with good approximation capacity and low computational consumption were designed to accurately approximate the UAV’s unknown nonlinear *** feedforward compensation provided by these approximators,a nonlinear-mapping-based constrained docking control law was developed for shipborne SideArm recovery of *** approach to controlling the docking trajectory and the forward docking speed of the UAV can achieve rapid and exact docking with a moving SideArm,without violating the preassigned safe docking-constraint *** under different docking scenarios were used to validate the effectiveness and advantages of the proposed docking-control algorithm.

关键词： SideArm recovery Unmanned aerial vehicle Docking control nonlinear mapping Echo state network

Insight into the mech.nism of 5-hydroxymethylfurfural electroreduction to 2,5-bis(hydroxymethyl)furan over Cu anchored n-doped carbon nanosheets

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nano Research 2024年第9期17卷 7991-7999页

作者： Haoran Wu xinwei ch.n Haishan Xu Runlu Yang Xin Wang Junying ch.n Zhenbing Xie Liang Wu Yiyong Mai School of chemical Engineering Zhengzhou UniversityZhengzhou 450001China School of chemistry and chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Key Laboratory of Electrical Insulation and Thermal AgeingShanghai Jiao Tong UniversityShanghai 200240China Department of chemistry Tangshan Normal UniversityTangshan 063000China

Design of non-noble metal electrocatalysts for biomass conversion to high-value chemicals and understanding the related catalytic mech.nisms are of profound significance but have remained a major ***,we developed a novel biomass-derived electrocatalyst(denoted as Cu/nC),featuring with electron-deficient copper nanoparticles anchored on n-doped carbon nanosheets,for the electrochemical reduction of 5-hydroxymethylfurfural(HMF)to 2,5-bis(hydroxymethyl)furan(BHMF,a vital precursor of functional polymers).The optimized Cu/nC electrocatalyst exhibited an excellent performance with high Faradaic efficiency(89.5%)and selectivity(90.8%)of BHMF at a low concentration of HMF(18.1 mM).Even at a very high HMF concentration(108.6 mM),the Faraday efficiency and selectivity of BHMF could still reach 74.8%and 81.1%,*** performance approached those of the reported noble metal-based *** study revealed that the n doping in the Cu/nC catalyst could regulate the electronic structure of Cu,strengthening the adsorption of the HMF carbonyl group,and thus boosting the selectivity of ***,strong electronic metal-support interactions of Cu and the n-doped carbon support optimized the charge transfer rate,thus promoting the dissociation of water to the active hydrogen(H^(*))species and boosting the reaction kinetic rate of H^(*)and HMF.

关键词： biomass 5-hydroxymethylfurfural electrochemical reduction n-doped carbon materials 2,5-bis(hydroxymethyl)furan

Development and application of photocatalytic coating for roadside nO_(x) mitigation in Hong Kong

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ch.nese chemical Letters 2024年第3期35卷 153-157页

作者： xinwei Li Pengge Wang Shuwen Han Yu Huang Wingkei Ho Steven Sai Hang Ho Shun-ch.ng Lee Meng Wang Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina State Key Laboratory of Loess and Quaternary Geology(SKLLQG)and Key Laboratory of Aerosol chemistry and Physics Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China Department of Science and Environmental Studies The Education University of Hong KongHong KongChina Division of Atmospheric Sciences Desert Research InstituteRenoNV 89512United States

A facile chemical method for the development of photocatalytic coating products was proposed based on practical application perspective for the Hong Kong roadside nitrogen oxides(nO_(x))***_(2)-based photocatalytic coating PC-C film with crystallized size of around 5–6 nm was synthesized with the peptization of H_(2)O_(2).The PC-C coating possesses a super-hydrophilicity surface and is proven to have a nO_(x)degradation rate of 46.8%with an optimum pH level of *** addition,the PC-C coating presents a promising photocatalytic nO_(x)degradation compared with other commercially available coating products and P25 when applied on two building materials of poly-methyl methacrylate(PMMA)and concrete surface.A weather resistance simulation and a 180-day on-site field trial were carried out the attenuation effects of photocatalytic coating applied in outdoor *** on epidemiological estimation and field investigation,hospital admissions for respiratory diseases(HARD)and mortality cases(MC)could be reduced with the application of PC-C coating along the street *** work demonstrates the feasibility of air pollution control measures for the local roadside nO_(x)using photocatalytic technology,offering promising health benefits with environmental remediation.

关键词： Photocatalysis Coating nO_(x) mitigation Hong Kong Roadside

Ultrathin polyimide-based composites with efficient low-reflectivity electromagnetic shielding and infrared stealth performance

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nano Research 2024年第7期17卷 6700-6712页

作者： Xu Zhao xinwei Tang Yunlong Qiao Shuangshuang Li Zihang Zhang Yezi Lu Mingyang Zhu Zaiyin Hu Lijuan Long Zich.ng Wang Tianxi Liu The Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringInternational Joint Research Laboratory for Nano Energy CompositesJiangnan UniversityWuxi 214122China Guizhou Aerospace Wujiang Electro-mech.nical Equipment Co. Ltd.No.20-5Dalian Road Aerospace Industrial ParkHuichuan DistrictZunyi 563000China School of Materials and Architectural Engineering Guizhou Normal UniversityGuiyang 550025China

Research.ng and manufacturing materials that possess both electromagnetic interference(EMI)shielding and infrared stealth capabilities is of great ***,an ultrathin polyimide-based nonwoven fabric with low-reflection EMI shielding/infrared stealth performance is successfully fabricated by in-situ loading of Fe_(3)O_(4)/Ag nanoparticles on the surface of polyimide(PI)fiber(PFA),and followed by bonding with a commercial Cu/ni *** synergistic assembly of PFA and Cu/ni promotes the rational construction of hierarchical impedance match.ng,inducing electromagnetic waves(EMW)to enter the composite and be dissipated as much as ***,the existence of Cu/ni mesh on back of PFA facilitates the formation of electromagnetic resonance and destructive interference of EMW reflected from composite,leading to a lowerreflectivity(0.26)EMI shielding performance of 58 dB within 24–40 GHz at a thinner thickness(430μm).More importantly,the fluffy PFA nonwoven fabric and metal Cu/ni mesh endow composite with good thermal insulation and low infrared emissivity,resulting in excellent infrared stealth performance in various *** a result,such excellent compatibility makes it possible to become a promising defense material to be applied in military tent for preventing electromagnetic and infrared radiation.

关键词： polyimide electromagnetic interference shielding low reflection infrared stealth

characterization of the effects of hyaluronan oligosaccharides on human gut microbiota using a simulated batch fermentation system

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Food Science and Human Wellness 2024年

作者： xinwei Gao Hongkang Zhu Litao Hu Jieyu Sun Wenjie Zuo Ping Liu Yang Wang Guoch.ng Du Zhen Kang The Science Center for Future Foods Jiangnan University The Key Laboratory of Carbohydrate chemistry and Biotechnology Ministry of Education Jiangnan University The Key Laboratory of Industrial Biotechnology Ministry of Education School of Biotechnology Jiangnan University School of Food Science and Technology Jiangnan University

The prebiotic effects of hyaluronan (HA) are widely recognized， contributing to improved gut health and immune modulation. Despite its extensive use as dietary supplement， the specific interactions between HA oligosaccharides (o-HAs) and the gut microbiome remain largely unexplored. To investigate its role and metabolic fate in gut homeostasis， 200 mg/day of o-HAs (average molecule weight 1k Da) were added to an automated computer-controlled SIMulator of the Gastrointestinal tract (SIMGI). The results revealed a significant reshaping of the intestinal flora composition by o-HAs， notably reducing the Firmicutes/Bacteroides ratio. Fermentation of o-HAs by gut microbiota significantly increased the abundance of Bifidobacteria， Prevotellaceae＿Prevotella， Dialister， Eubacterium， and Sutterella， but decreased that of Catenibacterium， Oscillospira， Klebsiella， and Citrobacter (P nded with significant enhancements in the content of short-chain fatty acids (SCFAs) such as acetic acid， propionic acid and n-butyric acid， highlighting the significant impact of o-HAs at the genus level. Furthermore， analysis of microbial function predicted the downregulation of pathological events in nine human diseases， particularly infectious ones (parasitic and bacterial). Potential inhibitions were observed in metabolic pathways associated with pentose and glucuronate interconversions as well as cationic antimicrobial peptide resistance. These findings underscore the in vitro prebiotic effects of o-HAs and their potential relevance in managing diverticular diseases or preventing metabolic disorders through the regulation of gut microbiota.

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一种在空气中运行稳定的界面保护型光学神经突触器件

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光学学报 2024年第14期44卷 258-265页

作者：李欣蔚杨成东苏琳琳刘逸龙南京信息工程大学电子与信息工程学院无锡学院电子信息工程学院

提出了利用在二氧化硅表面覆盖一层超薄（7 nm）致密的氮化硅来隔离空气中氧气的方法，氮化硅低的隧穿势垒能够保证电子通过并到达二氧化硅界面，形成电子捕获态。这样的器件设计极大地提高了器件在空气中的运行稳定性。此外，还模拟了... 详细信息

提出了利用在二氧化硅表面覆盖一层超薄（7 nm）致密的氮化硅来隔离空气中氧气的方法，氮化硅低的隧穿势垒能够保证电子通过并到达二氧化硅界面，形成电子捕获态。这样的器件设计极大地提高了器件在空气中的运行稳定性。此外，还模拟了突触可塑性行为。该设计不仅能够确保基于二氧化硅界面捕获的突触器件在空气中稳定地运行，而且能够为解决器件运行稳定性问题提供一种可行思路。

关键词：神经形态器件肖特基二极管界面捕获界面保护

Ag/Al_(2)O_(3)对船舶发动机尾气HC与nO_(x)协同催化净化

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内燃机学报 2024年第2期42卷 144-152页

作者：杨新伟郭江峰周伟中沪东重机有限公司上海201206 中船动力(集团)有限公司上海201208

船舶发动机尾气中的氮氧化物(nO_(x))和碳氢化合物(HC)对大气环境有较大的危害.直接利用HC作为还原剂与nO_(x)发生选择性催化还原脱硝反应(HC-SCR),实现对发动机尾气中的HC和nO_(x)协同催化净化,是非常具有应用前景的船舶尾气净化技术之... 详细信息

船舶发动机尾气中的氮氧化物(nO_(x))和碳氢化合物(HC)对大气环境有较大的危害.直接利用HC作为还原剂与nO_(x)发生选择性催化还原脱硝反应(HC-SCR),实现对发动机尾气中的HC和nO_(x)协同催化净化,是非常具有应用前景的船舶尾气净化技术之一,而开发高性能的HC-SCR催化剂是该技术的核心.采用商业伽马型氧化铝(γ-Al_(2)O_(3))作为载体、硝酸银(AgnO_(3))作为前驱体,通过湿浸渍法制备了负载型银基氧化铝(Ag/Al_(2)O_(3))催化剂.经固定床反应器活性测试发现,纯γ-Al_(2)O_(3)载体在甲烷-SCR(ch_(4)-SCR)和丙烷-SCR(C_(3)H_(8)-SCR)中具有一定的催化活性,而负载银(Ag)后得到的催化剂(Ag/Al_(2)O_(3))在反应中的低温催化性能得到进一步提高.利用粉末X射线衍射技术(XRD)、紫外可见分光光谱(UV-Vis)、HC完全氧化、nO_(x)程序升温脱附(nO-O_(2)-TPD)及原位红外光谱(in situ DRIFTS)等表征手段,分析了Ag/Al_(2)O_(3)催化剂的主要物相组成以及Ag物种的状态,并详细阐述了Ag/Al_(2)O_(3)催化剂表面HC-SCR反应的反应路径,即:HC在催化剂表面Ag物种的作用下部分氧化形成活性中间体醋酸类物种;一氧化氮(nO)在催化剂载体表面吸附活化成单齿硝酸盐类物种;HC部分氧化中间体醋酸类物种与nO吸附活化物种单齿硝酸盐物种发生反应,生成氮气(n2)和水(H2O).

关键词：船舶发动机氮氧化物碳氢选择性催化还原

手性P,n,n-配体/钯催化的不对称烯丙基取代反应

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有机化学 2024年第1期44卷 282-290页

作者：秦浩侯传金梁丁化何心伟李玲胡向平大连工业大学轻工与化学工程学院辽宁大连116034 安徽师范大学功能分子固体教育部重点实验室安徽芜湖241000 中国科学院大连化学物理研究所辽宁大连116023

P,n,n-配体是近年来发展起来的在不对称催化反应中具有广泛应用的一类手性配体.将手性P,n,n-配体应用于钯催化不对称烯丙基取代反应研究.结果表明,在较温和条件下,含C、n和O的各类亲核试剂均能顺利发生反应,获得良好的产率和对映选择性... 详细信息

P,n,n-配体是近年来发展起来的在不对称催化反应中具有广泛应用的一类手性配体.将手性P,n,n-配体应用于钯催化不对称烯丙基取代反应研究.结果表明,在较温和条件下,含C、n和O的各类亲核试剂均能顺利发生反应,获得良好的产率和对映选择性(产率高达97%,93%ee).

关键词： P,n,n-配体不对称烯丙基取代钯