检索结果-南通市图书馆

Benchmarking visual SlAM methods in mirror environments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computational Visual Media 2024年第2期10卷 215-241页

作者： Peter herbert Jing Wu Ze Ji Yu-Kun lai School of Computer Science and Informatics Cardiff UniversityAbacws BuildingSenghennydd RdCardiff CF244AGUK School of Engineering Cardiff UniversityQueen’s BuildingsThe ParadeCardiff CF243AAUK

Visual simultaneous localisation and mapping(vSlAM)finds applications for indoor and outdoor navigation that routinely subjects it to visual complexities,particularly mirror *** effect of mirror presence(time visible and its average size in the frame)was hypothesised to impact localisation and mapping performance,with systems using direct techniques expected to perform ***,a dataset,MirrEnv,of image sequences recorded in mirror environments,was collected,and used to evaluate the performance of existing representative *** ORB-SlAM3 and BundleFusion appear to show moderate degradation of absolute trajectory error with increasing mirror duration,whilst the remaining results did not show significantly degraded localisation *** mesh maps generated proved to be very inaccurate,with real and virtual reflections colliding in the reconstructions.A discussion is given of the likely sources of error and robustness in mirror environments,outlining future directions for validating and improving vSlAM performance in the presence of planar *** MirrEnv dataset is available at https://***/10.17035/d.2023.0292477898.

关键词： visual simultaneous localisation and mapping(vSlAM) mirror localisation mapping reflection datase

Actuating droplets with electrowetting: Force and dynamics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Droplet 2024年第2期3卷 113-124页

作者： Robert Hennig Vito Cacucciolo herbert Shea Soft transducers laboratory(lMtS) Ecole Polytechnique Fédérale de Lausanne(EPFL)NeuchatelSwitzerland Politecnico di Bari BariItaly

Electrowetting on dielectric(EWOD)allows rapid movement of liquid droplets on a smooth surface,with applications ranging from lab-on-chip devices to *** in-plane force on a droplet is a key indicator of EWOD *** force has been extensively modeled but few direct experimental measurements are *** study the EWOD force on a droplet using two setups that allow,for the first time,the simultaneous measurement of force and contact angle,while imaging the droplet shape at 6000 frames/*** several liquids and surfaces,we observe that the force saturates at a voltage of approximately 150 *** of voltages of up 2 kV,that is,10 times higher than is typical,does not significantly increase forces beyond the saturation ***,we observe that the transient dynamics,localized at the front contact line,do not show saturation with *** the higher voltages,the initial front contact line speed continues to increase,the front contact angle temporarily becomes near zero,creating a thin liquid film,and capillary waves form at the liquid–air *** the localized EWOD forces at the contact line exceed the capillary forces,projectile droplets *** surface tension allows for higher droplet forces,which we demonstrate with mercury.

关键词： capillary forces dynamics

Nonlinear-Optical Analogies in Nuclear-like Soliton Reactions:Selection Rules,Nonlinear tunneling and Sub-Barrier Fusion–Fission

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 Physics letters 2024年第8期41卷 1-7页

作者： t.l.Belyaeva V.N.Serkin Universidad Autonoma del Estado de Mexico Av.Instituto Literario 100C.P.50000TolucaMexico Benemerita Universidad Autonoma de Puebla Av.4 Sur 104C.P.72001PueblaMexico

the main goal of our study is to reveal unexpected but intriguing analogies arising between optical solitons and nuclear physics,which still remain hidden from *** consider the main cornerstones of the concept of nonlinear optics of nuclear reactions and the well-dressed repulsive-core *** the base of this model,we reveal the most intriguing properties of the nonlinear tunneling of nucleus-like solitons and the soliton selfinduced sub-barrier transparency *** describe novel interesting and stimulating analogies between the interaction of nucleus-like solitons on the repulsive barrier and nuclear sub-barrier *** main finding of this study concerns the conservation of total number of nucleons(or the baryon number)in nuclear-like soliton *** show that inelastic interactions among well-dressed repulsive-core solitons arise only when a“cloud”of“dressing”spectral side-bands appears in the frequency spectra of the *** property of nucleus-like solitons is directly related to the nuclear density distribution described by the dimensionless small shape-squareness *** the Fourier spectra of nucleus-like solitons are similar to the nuclear form *** show that the nuclear-like reactions between well-dressed solitons are realized by“exchange”between“particle-like”side bands in their spectra.

关键词： solitons soliton Nonlinear

A digital twins enabled underwater intelligent internet vehicle path planning system via reinforcement learning and edge computing

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2024年第2期10卷 282-291页

作者： Jiachen Yang Meng Xi Jiabao Wen Yang li Houbing herbert Song School of Electrical and Information Engineering Tianjin UniversityTianjin300072China Security and Optimization for Networked Globe laboratory(SONG lab) Embry-Riddle Aeronautical UniversityDaytona BeachFL32114USA

the Autonomous Underwater Glider(AUG)is a kind of prevailing underwater intelligent internet vehicle and occupies a dominant position in industrial applications,in which path planning is an essential *** to the complexity and variability of the ocean,accurate environment modeling and flexible path planning algorithms are pivotal *** traditional models mainly utilize mathematical functions,which are not complete and *** existing path planning algorithms depend on the environment and lack *** overcome these challenges,we propose a path planning system for underwater intelligent internet *** applies digital twins and sensor data to map the real ocean environment to a virtual digital space,which provides a comprehensive and reliable environment for path *** design a value-based reinforcement learning path planning algorithm and explore the optimal network structure *** path simulation is controlled by a closed-loop model integrated into the terminal vehicle through edge *** integration of state input enriches the learning of neural networks and helps to improve generalization and *** task-related reward function promotes the rapid convergence of the *** experimental results prove that our reinforcement learning based path planning algorithm has great flexibility and can effectively adapt to a variety of different ocean conditions.

关键词： Digital twins Reinforcement learning Edge computing Underwater intelligent internet vehicle Path planning

A review of whole-medical systems and holistic care approach for type 2 diabetes and associated metabolic syndrome

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 Integrative Medicine 2024年第3期22卷 199-209页

作者： loveness Makoni Idah t.Manduna Alaisa l.Mbiriri Department of Health Sciences Faculty of Health and Environmental Health SciencesCentral University of TechnologyFree State20 President Brand StreetPrivate bag X20539Bloemfontein 9300South Africa Centre for Applied Food Sustainability and Biotechnology(CAFSaB) Faculty of Health and Environmental Health SciencesCentral University of TechnologyFree State20 President Brand StreetPrivate bag X20539Bloemfontein 9300South Africa Adventist Development and Relief Agency(ADRA) 5 Cecil RoadGreendaleHarare 0000Zimbabwe

Whole-person care and holistic care approach has been proposed for complementary and integrative health care for type 2 diabetes ***,some doubts still exist on the feasibility of replicating processes followed in clinical trials and observational studies in real-world *** narrative literature review summarized and assessed existing clinical evidence(clinical trials,observational studies,and case reports)describing holistic and integrated care approach in adult and adolescent individuals with type 2 diabetes mellitus in clinical *** goal was to highlight existing evidence for implementation and outcomes of whole-medical systems and holistic integrated care approach for type 2 diabetes mellitus.A nonsystematic literature search was performed on Google Scholar,PubMed,Web of Science,ProQuest and ScienceDirect to identify clinical evidence from different parts of the world,evaluating the use of whole-medical systems and/or holistic care interventions in clinical practice for management of type 2 diabetes *** keywords were used in the *** were analyzed using content analysis and simple descriptive statistics(percentages).Most of the studies(64%)were mainly conducted in Eastern countries(India,China and Israel)while 36%of the studies were conducted in the Western countries(USA,Netherlands,Canada and Mexico).lifestyle medicine and integrated naturopathy were shown to be the commonly used whole-medical systems for type 2 diabetes mellitus *** improvements in type 2 diabetes parameters,medication use,other symptoms,and overall feeling of wellness were observed in all *** review study revealed limited utilization and/or documentation of whole-medical systems or holistic care treatments for type 2 diabetes mellitus in regions of the world other than eastern *** medicine,naturopathy,yoga,Ayurveda and traditional Chinese medicine were shown to be effective for type 2 diabetes mellitu

关键词： Complementary and alternative medicine Holistic care Integrative medicine type 2 diabetes mellitus team-based intervention

Reply to the note by li Piani et al.

在线全文

学校读者我要写书评

暂无评论

Defence technology（防务技术） 2024年第1期31卷 603-606页

作者： t.li Piani J.Weerheijm l.J.Sluys tU Delft Stevinweg 12628 CNDelftthe Netherlands tNO PO Box 452280 AARijswijkthe Netherlands NlDA Faculty of Military Sciences1781 CADen Helderthe Netherlands

In 2017,a ballistic phenomenological model was proposed by the authors of Ref.[1] to numerically simulate the experimental depths of small caliber projectiles impacting walls made of *** opportunity for a new model in the field revealed from the observation that two older models recently used by the authors of Ref.[2] shared a linear relationship between the penetration depth P and the impacting velocity v_(O).

关键词： Penetration Adobe Modeling

Potential Secretory transporters and Biosynthetic Precursors of Biological Nitrification Inhibitor 1,9-Decanediol in Rice as Revealed by transcriptome and Metabolome Analyses

在线全文

学校读者我要写书评

暂无评论

Rice science 2024年第1期31卷 87-102页

作者： DI Dongwei MA Mingkun ZHANG Xiaoyang lU Yufang herbert J.KRONZUCKER SHI Weiming State Key laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China School of Food Science and Engineering Foshan UniversityFoshan 528000China School of BioSciences The University of MelbourneParkvilleVIC 3010Australia University of Chinese Academy of Sciences Beijing 100049China

Biological nitrification inhibitors(BNIs)are released from plant roots and inhibit the nitrification activity of microorganisms in soils,reducing NO_(3)^(‒)leaching and N2O emissions,and increasing nitrogenuse efficiency(NUE).Several recent studies have focused on the identification of new BNIs,yet little is known about the genetic loci that govern their biosynthesis and *** applied a combined transcriptomic and metabolomic analysis to investigate possible biosynthetic pathways and transporters involved in the biosynthesis and release of BNI 1,9-decanediol(1,9-D),which was previously identified in rice root *** results linked four fatty acids,icosapentaenoic acid,linoleate,norlinolenic acid,and polyhydroxy-α,ω-divarboxylic acid,with 1,9-D biosynthesis and three transporter families,namely the AtP-binding cassette protein family,the multidrug and toxic compound extrusion family,and the major facilitator superfamily,with 1,9-D release from roots into the soil *** finding provided candidates for further work on the genes implicated in the biosynthesis and secretion of 1,9-D and pinpoint genetic loci for crop breeding to improve NUE by enhancing 1,9-D secretion,with the potential to reduce NO_(3)^(‒)leaching and N2O emissions from agricultural soils.

关键词： 1,9-decanediol biological nitrification inhibitor metabolomic analysis nitrogen-use efficiency transcriptomic analysis

A simulation study on spatial and time resolution for a cost-effective positron emission particle tracking system

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第5期88卷 312-322页

作者： Josephine Oppotsch Matthias Steinke Miriam Fritsch Fritz-herbert Heinsius thomas Held Nikoline Hilse Viktor Scherer Ulrich Wiedner Ruhr-Universität Bochum Institut für Experimentalphysik I44801 BochumGermany Ruhr-Universität Bochum Lehrstuhl für Energieanlagen und Energieprozesstechnik44801 BochumGermany

this work is the second part of a simulation study investigating the processing of densely packed and moving granular assemblies by positron emission particle tracking (PEPt).Since medical positron emission tomography (PEt) scanners commonly used for PEPt are very expensive,a PEt-like detector system based on cost-effective organic plastic scintillator bars is being developed and tested for its *** this context,the spatial resolution of a resting positron source,a source moving on a freely designed model path,and a particle motion given by a discrete element method (DEM) simulation is studied using Monte Carlo simulations and the software toolkit *** not only extended the simulation and reconstruction to a moving source but also significantly improved the spatial resolution compared to previous work by adding oversampling and iteration to the reconstruction ***,in the case of a source following a trajectory developed from DEM simulations,a very good resolution of about 1 mm in all three directions and an average 3D deviation between simulated and reconstructed events of 2.3 mm could be ***,the resolution for realistic particle motion within the generic grate system (which is the test rig for further experimental studies) is well below the smallest particle *** simulation of the dependence of the reconstruction accuracy on tracer particle location revealed a nearly constant efficiency within the entire detector system,which demonstrates that boundary effects can be neglected.

关键词： Positron emission particle tracking Monte Carlo method time-of-flight Plastic scintillators Silicon photomultipliers(SiPMs)

A simulation study for a cost-effective PEt-like detector system intended to track particles in granular assemblies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2024年第1期84卷 117-125页

作者： Josephine Oppotsch Antonios Athanassiadis Miriam Fritsch Fritz-herbert Heinsius thomas Held Nikoline Hilse Viktor Scherer Matthias Steinke Ulrich Wiedner Ruhr-Universität Bochum Institut für Experimentalphysik I44801 BochumGermany Ruhr-Universität Bochum Lehrstuhl für Energieanlagen und Energieprozesstechnik44801 BochumGermany

Since many industrial applications rely on the processing of densely packed and moving granular ma-terial,obtaining bulk internal information on the particle movement inside the reactors is of great *** information can be delivered by Positron Emission Particle tracking(PEPt).By marking pellets with a positron-emitting radioisotope,the position of these tracer particles can be determined via the time-of-flight differences of the emitted gamma-ray *** current paper proposes a PEt-like detector system based on cost-effective organic plastic scintillators instead of the more common but expensive inorganic *** system is currently under construction and was tested for its resolution and efficiency in this simulation *** Monte Carlo simulations and the software toolkit Geant4,three different geometries(an empty glass box,a generic grate system,and a cubic box of 1 m3 completely filled with pellets)were investigated,leading to a spatial resolution in the millimeter range and an efficiency,defined as the ratio of reconstructed decay locations to simulated decays,of 2.7%,1.4%,and 0.3%.

关键词： Positron emission particle tracking Geant4 Monte Carlo method time-of-flight Plastic scintillators Silicon photomultipliers(SiPMs)