检索结果-南通市图书馆

Principal Component Analysis of Ground Level enhancement of Cosmic Ray events

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2023年第3期23卷 155-169页

作者： R.e.Ugwoke A.A.Ubachukwu j.O.Urama O.Okike j.A.Alhassan A.e.Chukwude Department of Physics Federal University of Technology OwerriImo StateNigeria Department of Physics and Astronomy University of Nigeria.NsukkaNigeria Department of Industrial Physics Ebonyi State UniversityAbakalikiNigeria

We applied principal component analysis(PCA)to the study of five ground level enhancements(GLes)of cosmic ray(CR)*** nature of the multivariate data involved makes PCA a useful tool for this study.A subroutine program written and implemented in the R software environment generated interesting principal *** of the results shows that the method can distinguish between neutron monitors(NMs)that observed Forbush decreases from those that observed GLes at the same *** PCA equally assigned NMs with identical signal counts with the same correlation factor(r)and those with close r values equally have a close resemblance in their CR *** results further indicate that while NMs that have the same time of peak may not have the same r,most NMs that had the same r also had the same time of *** the second principal components yielded information on the differences between NMs having opposite but the same or close values of *** that had the same r equally had the tendency of being close in latitude.

关键词： routine equally identical

Study on the packed volume and the void ratio of idealized human red blood cells using a ?nite-discrete element method

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(english edition) 2019年第5期40卷 737-750页

作者： Dong XU Chunning jI A.MUNjIZA e.KALIVIOTIS e.AVITAL j.WILLAMS State Key Laboratory of Hydraulic engineering Simulation and Safety Tianjin University School of engineering & Material Science Queen Mary University of London Faculty of engineering and Technology Cyprus University of Technology

Numerical simulations are performed to examine the packing behavior of human red blood cells(RBCs). A combined ?nite-discrete element method(FDeM) is utilized, in which the RBCs are modeled as no-friction and no-adhesion solid bodies. The packed volume and the void ratio of a large number of randomly packed RBCs are clari?ed,and the effects of the RBC shape, the mesh size, the cell number, and the container size are investigated. The results show that the packed human RBCs with normal shape have a void ratio of 28.45%, which is slightly higher than that of the ?at or thick cells used in this study. Such information is bene?cial to the further understanding on the geometric features of human RBCs and the research on RBC simulations.

关键词： red blood cell (RBC) void ratio packed volume discrete element method

A discrete contact model for complex arbitrary-shaped convex geometries

在线全文

学校读者我要写书评

暂无评论

Particuology 2023年第9期80卷 180-191页

作者： jan e.Marquardt Ulrich j.Römer Hermann Nirschl Mathias j.Krause Lattice Boltzmann Research Group Karlsruhe Institute of TechnologyStraße am Forum 8Karlsruhe76131Germany Institute for Mechanical Process engineering and Mechanics Karlsruhe Institute of TechnologyStraße am Forum 8Karlsruhe76131Germany Institute of engineering Mechanics Karlsruhe Institute of TechnologyKaiserstraße 10Karlsruhe76131Germany Institute for Applied and Numerical Mathematics Karlsruhe Institute of TechnologyEnglerstraße 2Karlsruhe76131Germany

The shape of particles has a significant influence on the behavior of suspensions,as the particle-fluid,particle-particle,and particle-wall interactions depend on ***,the simultaneous consideration of complex particle shapes and four-way coupling remains a major *** is mainly due to a lack of suitable contact *** models for complex shapes have been proposed in literature,and most limit the accuracy of the particle-fluid *** this reason,this paper presents a novel contact model for complex convex particle shapes for use with partially saturated methods,in which we propose to obtain necessary contact properties,such as the indentation depth,by a discretization of the contact *** goal of the proposed model is to enable comprehensive and accurate studies of particulate flows,especially with high volume fractions,that lead to new insights and contribute to the improvement of existing industrial *** ensure correctness and sustainability,we validate the model extensively by studying cases with and without *** the latter case,we use the homogenized lattice Boltzmann *** provided investigations show a great agreement of the proposed discrete contact model with analytical solutions and the literature.

关键词： Partially saturated cells method Homogenized lattice Boltzmann method Arbitrarily shaped particle Discrete contact model Particle-resolved simulation OpenLB

Void Reduction:A Methodical and Reliable Approach

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

Void Reduction:A Methodical and Reliable Approach

Numerical studies towards practical large-eddy simulation

第十一届中国高端SMT学术会议

作者： Christopher nash Indium Corporation

experiencing soldering defects?Need help with your SMT electronics assembly process?You’re not *** is one of the electronics assembly’s longest and more troublesome *** are many factors to consider when working to r...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

journal of Thermal Science 2007年第4期16卷 328-336页

作者： j.Boudet j.Caro L.Shao e.Lév(?)que LMFA Laboratoire

Large-eddy simulation developments and validations are presented for an improved simulation of turbulent internal flows. Numerical methods are proposed according to two competing criteria： numerical qualities （precision and spectral characteristics）, and adaptability to complex configurations. First, methods are tested on academic test-cases, in order to abridge with fundamental studies. Consistent results are obtained using adaptable finite volume method, with higher order advection fluxes, implicit grid filtering and ＂low-cost＂ shear-improved Smagorinsky model. This analysis particularly focuses on mean flow, fluctuations, two-point correlations and spectra. Moreover, it is shown that exponential averaging is a promising tool for LeS implementation in complex geometry with deterministic unsteadiness. Finally, adaptability of the method is demonstrated by application to a configuration representative of blade-tip clearance flow in a turbomachine.

关键词： LeS adaptable methods validation

ＣＯＭＰＬＥＸＩＴＹＯＦＬＡＲＧＥＴＩＭＥＢＥＨＡＶＩＯＵＲＯＦＥＶＯＬＵＴＩＯＮＥＱＵＡＴＩＯＮＳＷＩＴＨＢＯＵＮＤＥＤＤＡＴＡ

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2002年第2期23卷 293-310页

作者： j.L.VZQUeZ e.ZUAZUA Departamento de Matematicas Universidad AutonomaDepartamento de Matematica AplicadaUniversidadComplutense 28049MadridSpain28040 M

The authors study the asymptotic behaviour of solutions of the heat equation and a number of evolution equations using scaling techniques. It is proved that in the framework of bounded data stabilization need not occur and the general asymptotic behaviour is complex. This behaviour reflects for large times, even on compact sets, the complexity of the initial data at infinity.

关键词： Asymptotic behaviour Scaling Omega-limit Heat equation Hyperbolic conservation laws

Multilevel Protection of Human Rights in the Inter-American System: existence of this Protection at International and National Levels

在线全文

学校读者我要写书评

暂无评论

The journal of Human Rights 2015年第6期14卷 588-596页

作者： Claudio nash ROjIS Law School University of Chile

This paper seeks to demonstrate that in the Inter-American human rights system, there is a form of multilevel human rights protection. To do so, a number of institutions where this protection is present are reviewed. In addition, regulatory and practical bases having made this form of protection possible are outlined. Lastly, the issue of the relationship produced at the level of the judiciary from this multilevel discussion between national and international systems is discussed.

关键词： Inter-American human rights system human rights protection international level national level

The supernova remnant CTB 37B and its associated magnetar CXOU j171405.7-381031:evidence for a magnetar-driven remnant

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2011年第6期11卷 625-630页

作者： j.e.Horvath M.P.Allen Instituto de Astronomia Geofísica e Ciências Atmosféricas-Universidade de So PauloRua do Mato122605508-900 Cidade Universitria So Paulo SPBrazil CeFeT So Paulo Rua Pedro Vicente 62501109-010Caninde'So Paulo SPBrazil

We discuss the association between the candidate magnetar CXOU j171405.7-381031 and the supernova remnant CTB *** recent detection of the period derivative of the object allowed an estimation of a young characteristic age of only ～ *** value is too small to be compatible even with the minimum radius of the remnant being ≥ 10 pc,the value corresponding to the lower limit of the estimated distance of 10.2 ± 3.5 kpc,unless the true distance happens to be even smaller than the lower *** argue that a consistent scenario for the remnant＇s origin,in which the latter is powered by the energy injected by a young magnetar,is indeed more accurate to explain the young age,and demonstrates its non-standard（***-driven） nature.

关键词： stars:supernova — stars:neutron

Olfaction and reaction: The role of olfactory and hypothalamic investment in the antipredator responses to chemical alarm cues by northern redbelly dace

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2023年第6期69卷 738-746页

作者： Brendan j.joyce Grant e.Brown Department of Biology Concordia UniversityMontrealQuebecCanada

Neuroplasticity enables teleosts to promote or downregulate the growth of their brains *** compensate for the effects of predation pressure,teleosts may alter their brain morphology and behavioral responses to mitigate its impact on individual ***-predation environ-ments often promote specific patterns of brain growth and produce bolder and more proactive *** to the expense of maintaining neural tissue,relative size indicates the regions most relied *** northern redbelly dace Chrosomus eos,as little as 2 weeks of elevated predation pressure,resulted in increased investment in their olfactory bulbs and optic tecta,while the imposition of captivity produced smaller,less symmetric *** together,these results suggest that an individual could potentially become better able to detect a threat,and simultaneously less inclined to react to it,making the impact of either change in isolation is difficult to ***,we compared interindividual variation in gross brain morphology,risk-taking tactics in a novel arena(shy-bold personality),and responding to olfactory cues(proactive/reac-tive stress-coping style).We hypothesized that olfactory investment would positively correlate with response intensity to predator cue concen-tration and respond across a wider range of cue concentrations,while hypothalamus size would correlate with shyness and *** to heightened risk produced more bold/proactive individuals,with larger olfactory bulbs and smaller ***,the direction of the correlation between hypothalamus size and behavior varied by treatment,and olfactory investment only corresponded with response intensity amongst proactive *** findings illustrate the potential pitfalls of relating gross brain morphology to complex behavior and suggest that stress-coping style is a relevant consideration in future studies.

关键词： boldness brainmorphology neuroplasticity predation proactivity stress-coping style