检索结果-南通市图书馆

New Identities for Weak KAM Theory(For Haim Brezis,in continuing admiration)

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2017年第2期38卷 379-392页

作者： Lawrence craig EVANS Department of Mathematics University of CaliforniaBerkeleyUSA.

This paper records for the Hamiltonian H =1/2|p|~2+ W(x) some old and new identities relevant for the PDE/variational approach to weak KAM theory.

关键词： Weak KAM theory, Effective Hamiltonian, Hamiltonian dynamics

Regarding the Distribution of Glue in the Pion

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第8期38卷 17-22页

作者： Lei Chang craig D.Roberts School of Physics Nankai UniversityTianjin 300071China School of Physics Nanjing UniversityNanjing 210093China Institute for Nonperturbative Physics Nanjing UniversityNanjing 210093China

Understanding why the scale of emergent hadron mass is obvious in the proton but hidden in the pion may rest on mapping the distribution functions(DFs)of all partons within the pion and comparing them with those in the proton;and since glue provides binding in quantum chromodynamics,the glue DF could play a special *** reliable predictions for the proton’s DFs is difficult because the proton is a three-valence-body bound-state *** sketched herein,the situation for the pion,a two-valence-body problem,is much better,with continuum and lattice predictions for the valence-quark and glue DFs in *** beginning of theory alignment is timely because experimental facilities now either in operation or planning promise to realize the longstanding goal of providing pion targets,thereby enabling precision experimental tests of rigorous theory predictions concerning Nature’s most fundamental Nambu-Goldstone bosons.

关键词： valence thereby rigorous

Resolving the Bethe–Salpeter Kernel

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第7期38卷 17-22页

作者： Si-Xue Qin craig D.Roberts Department of Physics Chongqing UniversityChongqing 401331China School of Physics Nanjing UniversityNanjing 210093China Institute for Nonperturbative Physics Nanjing UniversityNanjing 210093China

A novel method for constructing a kernel for the meson bound-state problem is *** produces a closed form that is symmetry-consistent(discrete and continuous)with the gap equation defined by any admissible gluon-quark vertex,Γ.Applicable even when the diagrammatic content ofΓis unknown,the scheme can foster new synergies between continuum and lattice approaches to strong *** framework is illustrated by showing that the presence of a dressed-quark anomalous magnetic moment inΓ,an emergent feature of strong interactions,can remedy many defects of widely used meson bound-state kernels,including the mass splittings between vector and axial-vector mesons and the level ordering of pseudoscalar and vector meson radial excitations.

关键词： meson quark admissible

Dielectrophoretic assembly of carbon nanotubes and stability analysis

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2013年第4期23卷 367-373页

作者： Libao An craig Friedrich College of Mechanical Engineering Hebei Provincial Key Laboratory of Inorganic Nonmetallic MaterialsHebei United University Department of Mechanical Engineering-Engineering Mechanics Multi-Scale Technologies InstituteMichigan Technological University

Nanoscale dimensions and remarkable properties of carbon nanotubes make them promising building blocks for *** requirement is the need to manipulate single or multiple carbon nanotubes to bridge electronic *** this paper,multi-walled carbon nanotubes with a variety of sizes are assembled onto electrodes using alternative current electric felds by *** effect of the dielectrophoretic parameters and the nanotube size as well as the length uniformity on the assembly is experimentally ***–voltage characteristics of assembled carbon nanotubes are *** experimental results showed that both the dielectrophoretic parameters and length uniformity of carbon nanotubes have an infuence on the stability of assembly *** uniform carbon nanotubes with an appropriate length and suffcient stiffness,which are more controllable by dielectrophoresis,is necessary for an assembly of a small number of carbon nanotubes.

关键词： Carbon nanotube Assembly Dielectrophoresis Process parameter Stability

Single-lens dynamic z-scanning for simultaneous in situ position detection and laser processing focus control

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2023年第12期12卷 2655-2667页

作者： Xiaohan Du Camilo Florian craig B.Arnold Department of Mechanical and Aerospace Engineering Princeton UniversityPrincetonNJ 08544USA Department of Systems Engineering City University of Hong KongHong KongChina Institut für Werkstofftechnik Universität Kassel34125 KasselGermany Princeton Materials Institute Princeton UniversityPrincetonNJ 08544USA

Existing auto-focusing methods in laser processing typically include two independent modules,one for surface detection and another for z-axis *** latter is mostly implemented by mechanical z stage motion,which is up to three orders of magnitude slower than the lateral processing *** alleviate this processing bottleneck,we developed a single-lens approach,using only one high-speed z-scanning optical element,to accomplish both in situ surface detection and focus control quasi-simultaneously in a dual-beam *** probing beam scans the surface along the z-axis continuously,and its reflection is detected by a set of confocal *** on the temporal response of the detected signal,we have developed and experimentally demonstrated a dynamic surface detection method at 140-350 kHz,with a controlled detection range,high repeatability,and minimum linearity error of 1.10%.Sequentially,by synchronizing at a corresponding oscillation phase of the z-scanning lens,the fabrication beam is directed to the probed z position for precise focus ***,our approach provides instantaneous surface tracking by collecting position information and executing focal control both at 140-350 kHz,which significantly accelerates the axial alignment process and offers great potential for enhancing the speed of advanced manufacturing processes in three-dimensional space.

关键词： dynamic beam simultaneous

Rethinking random Hough Forests for video database indexing and pattern search

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

Computational Visual Media 2016年第2期2卷 143-152页

作者： craig Henderson Ebroul Izquierdo Multimedia and Vision Research Group School of Electronic Engineering and Computer ScienceQueen Mary University of London

Hough Forests have demonstrated effective performance in object detection tasks, which has potential to translate to exciting opportunities in pattern search. However, current systems are incompatible with the scalability and performance requirements of an interactive visual search. In this paper, we pursue this potential by rethinking the method of Hough Forests training to devise a system that is synonymous with a database search index that can yield pattern search results in near real time. The system performs well on simple pattern detection, demonstrating the concept is ***, detection of patterns in complex and crowded street-scenes is more challenging. Some success is demonstrated in such videos, and we describe future work that will address some of the key questions arising from our work to date.

关键词： Hough Forests pattern detection pattern search machine learning

Multifaceted Bioinspiration for Improving the Shaft Resistance of Deep Foundations

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2020年第5期17卷 1059-1074页

作者： Seyed Ali Aleali Paola Bandini craig Michael Newtson Center for Bio-mediated and Bio-inspired Geotechnics Department of Civil EngineeringNew Mexico State UniversityLas CrucesNew Mexico 88003-8001USA

This paper describes the bioinspiration process to derive design concepts for new deep foundation systems that have greater axial capacity per unit volume of pile material compared to conventional deep *** study led to bioinspired ideas that provide greater load capacity by increasing the pile shaft *** bioinspiration approach used problem-solving strategies to define the problem and transfer strategies from biology to geotechnical *** bioinspiration considered the load transfer mechanism of hydroskeletons and the anchorage of the earthworm,razor clam,kelp,and lateral roots of *** biostrategies that were transferred to the engineering domain included a flexible but incompressible core,passive behaviour against external loading,a longitudinally split shell that allows expansion for anchorage,and lateral root-type or setae-type anchoring *** concepts of three bioinspired deep foundation systems were proposed and *** advantage of this approach was illustrated with two examples of the new laterally expansive pile in drained sand under axial *** finite element analysis of these examples showed that the new laterally expansive pile can provide considerably greater load capacity compared to a conventional cylindrical pile due to the increased lateral confining pressure developed along the expanded pile core.

关键词： bioinspiration expansion anchorage deep foundation pile capacity frictional resistance

Estimation of food composition of Hodotermes mossambicus （Isoptera： Hodotermitidae） based on observations and stable carbon isotope ratios

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

Insect Science 2011年第2期18卷 175-180页

作者： craig T. Symes Stephan Woodborne School of Animal Plant and Environmental Sciences University of the Witwatersrand Wits Natural Resources and the Environment CSIR Pretoria South Africa

The diet of the harvester termite Hodotermes mossambicus was investigated at two sites with distinct dietary components： C4 grasses （δ13 C isotope values, -13.8%0 to -14.0%0） and C3 plants （δ13C isotope values, -25.6%0 to -27.1%0）. By comparing observations of food items carried into the colony by the termites and carbon isotope ratios of whole termites （that determined assimilated carbon）, the relative proportion of the C3 and C4 plant food components of the termite diet was estimated. There was agreement between the observational data and stable carbon isotopic data, with grass representing approximately 93% of the diet ofH. mossambicus at two study sites （urban and rural） on the South African highveld. However, when correcting for mass of food items, that is, C3 and C4, carried by termites, the proportion of grass （C4） in the diet may be underestimated.

关键词： carbon assimilation colony harvester termite Suikerbosrand

BioTRIZ Suggests Radiative Cooling of Buildings Can Be Done Passively by Changing the Structure of Roof Insulation to Let Longwave Infrared Pass

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 Bionic Engineering 2008年第1期5卷 55-66页

作者： Salmaan craig David Harrison Andrew Cripps Daniel Knott School of Engineering and Design Brunel UniversityLondon UB8 3PHUKBuro Happold LtdLondon W1T 1PDUK School of Engineering and Design Brunel UniversityLondon UB8 3PHUK Buro Happold Ltd London W1T 1PDUK

This paper demonstrates the application of a design tool called BioTRIZ. Its developers claim that it can be used to access biological strategies for solving engineering problems. Our aim is to design a roof for hot climates that gets free cooling through radiant coupling with the sky. The insulation in a standard roof stops the sun and convection from warming the thermal mass. But it also restricts the mass＇s longwave view of the cool sky. Different solutions to this conflict are offered by BioTRIZ. The chosen solution is to replace the standard insulation component with an open cell honeycomb. The vertical cells would allow longwave radiation to pass, while arresting convection. The solutions offered by BioTRIZ＇s technological counterpart include no such changes in structure. It is estimated that the thermal mass in the biomimetic roof would remain on average 4.5℃ cooler than in a standard roof over a year in Riyadh, Saudi Arabia.

关键词： biomimetics TRIZ BioTRIZ radiative cooling building design passive design