检索结果-南通市图书馆

Apples to oranges:environmentally derived,dynamic regulation of serotonin neuron subpopulations in adulthood?

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第9期20卷 2596-2597页

作者： Christopher j.o.Connell Matthew j.Robson Department of Genetics College of MedicineHarvard UniversityBostonMAUSA james L.Winkle College of Pharmacy Division of Pharmaceutical SciencesUniversity of CincinnatiCincinnatiOHUSA Neuroscience Graduate Program College of MedicineUniversity of CincinnatiCincinnatiOHUSA

Traumatic brain injury(TBI)is a public health problem with an undue economic burden that impacts nearly every age,ethnic,and gender group across the globe(Capizzi et al.,2020).TBIs are often sustained during a dynamic range of exposures to energetic environmental forces and as such outcomes are typically heterogeneous regarding severity and pathology(Capizzi et al.,2020).

关键词： sustained orange dynamic

Growth in Infinite Groups of Infinite Subsets

在线全文

学校读者我要写书评

暂无评论

Algebra Colloquium 2015年第2期22卷 333-348页

作者： j.o. Button Selwyn College University of Cambridge Cambridge CB3 9DQ UK

Given an infinite group G, we consider the finitely additive invariant measure defined on finite unions of cosets of finite index subgroups. We show that this shares many properties with the size of subsets of a finite group, for instance we can obtain equivalent results on the Ruzsa distance and product free sets. In particular, if G has infinitely many finite index subgroups, then it has subsets S of measure arbitrarily close to 1/2 with square S2 having measure less than 1. We also examine properties of the Ruzsa distance on the set of finite index subgroups of an infinite group, whereupon it becomes a genuine metric.

关键词： group product set, Ruzsa distance

SPECTRA oF CoMPoSITIoN GRoUPS oN THE WEIGHTED DIRICHLET SPACE oF THE UPPER HALF-PLANE

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2020年第6期40卷 1739-1752页

作者： M.o.AGWANG j.o.BoNYo Department of Pure and Applied Mathematics Maseno UniversityP.O.BOX 333-40105MasenoKenya

We prove that the group of weighted composition operators induced by continuous automorphism groups of the upper half plane U is strongly continuous on the weighted Dirichlet space of U,Dα(U).Further,we investigate when they are isometries on Dα(U).In each case,we determine the semigroup properties while in the case that the induced composition group is an isometry,we apply similarity theory to determine the spectral properties of the group.

关键词： one-parameter semigroup composition operator semigroups strong continuity infinitesimal generator spectra

Upshot of Sprawl Incidence on Pattern of Land Use Changes and Building Physiognomies in Akure Region, Nigeria

在线全文

学校读者我要写书评

暂无评论

journal of Geographical Research 2020年第4期3卷 36-44页

作者： owoeye j.o. Department of Urban and Regional Planning School of Environmental TechnologyFederal University of TechnologyAkure.P.M.B 704Akure Ondo StateNigeria

This study investigates the upshot of sprawl incidence on pattern of land use changes and building physiognomies in Akure and its *** social survey research method(SSRM)to investigate the upshot,data were gathered via structured questionnaires on selected households in the region,involving Akure municipal and eight contiguous ***,the survey method involves interview,personal observation and photo-snaps to elucidate existing situation in the *** households’population in Akure municipal was estimated at 95,232 while 14,794 was estimated in the selected eight contiguous *** this,a sample of 1%was systematically selected,which amounted to 1100 sampled *** show regular massive inflow of people into the city due to unguided expansions that have serious sway on land use determinant in the city and its contiguous *** also has significant influence on variation in building arrangements and facility distribution across the *** mitigate this,the study advocates proactive efforts of stakeholders in urban management to employing inventive measures over private and public lands in logical *** also suggests the espousal of regional development programs to checkmate the rate of peoples’incursion into Akure,being the state *** government headquarters and other major towns in the region should be reinforced with functional basic facilities to curtail the excessive influx into the city.

关键词： Upshot Sprawl incidence Land use change Building physiognomies Unguided expansion

Isothermal study of effusion cooling flows using a large eddy simulation approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

航空动力学报 2009年第4期24卷 729-739页

作者： W.P.Bennett j.j.mc Guirk Aeronautical and Automotive Engineering Department Loughborough University

An isothermal numerical study of effusion cooling flow is conducted using a large eddy simulation(LES) *** main types of cooling are considered,namely tangential film cooling and oblique patch effusion *** represent tangential film cooling,a simplified model of a plane turbulent wall jet along a flat plate in quiescent surrounding fluid is *** contrast to a classic turbulent boundary layer flow,the plane turbulent wall jet possesses an outer free shear flow region,an inner near wall region and an interaction region,characterised by substantial levels of turbulent shear stress *** shear stress characteristics hold significant implications for RANS modelling,implications that also apply to more complex tangential film cooling flows with non-zero free stream *** LES technique used in the current study provides a satisfactory overall prediction of the plane turbulent wall jet flow,including the initial transition region,and the characteristic separation of the zero turbulent shear stress and zero shear strain *** effusion patch cooling is modelled using a staggered array of 12 rows of effusion holes,drilled at 30° to the flat plate *** effusion holes connect two channels separated by the flat ***,these comprise of a channel representing the combustion chamber flow and a cooling air supply channel.A difference in pressure between the two channels forces air from the cooling supply side,through the effusion holes,and into the combustion chamber *** from successive effusion rows coalesces to form an aerodynamic film between the combustion chamber main flow and the flat *** practical applications,this film is used to separate the hot combustion gases from the combustion chamber *** numerical model is shown to be capable of accurately predicting the injection,penetration,downstream decay,and coalescence of the effusion *** addition,the numerical model captures entrainmen

关键词： effusion cooling large eddy simulation isothermal analysis film cooling turbulent wall jet

Implication of Household’s Income Composition on Infrastructure Maintenance in Residential Core of Akure,Nigeria

在线全文

学校读者我要写书评

暂无评论

journal of Geographical Research 2021年第1期4卷 28-36页

作者： owoeye j.o. olasemojo o.R. Department of Urban and Regional Planning School of Environmental TechnologyFederal University of TechnologyAkure Ondo StateNigeria

This study examines the implication of household income composition on infrastructure maintenance in the residential core of Akure,Nigeria with a view to providing suggestive recommendations that will remedy identified problems in the research *** regards to this,an estimated of 1%research population,amounting to 425,were served with questionnaires using systematic random sampling technique with *** revealed that residents in the study area are low income earners with larger population influenced by market proximity,low prices of staple food items and affordable but tumbledown ***,essential facilities are in poor state owing to poor ***,household income induced variables considered in the study,which accounted for 75.6%of the challenges limiting routine facilities maintenance in the study *** study recommends skill acquisition training,resource collaborative efforts and soft loans scheme to boost the income generation of residents in this locale.

关键词： Household income Infrastructure maintenance Concession Residential core Akure

Microstructure of Al-Si Alloys Rapidly Solidified from the Different Temperature Melts

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 Materials Science & Technology 1999年第3期15卷 225-228页

作者： Gui, mc jia, j Song, GS Li, QC Beijing Inst Aeronaut Mat Natl Key Lab Adv Composites Beijing 100095 Peoples R China Harbin Inst Technol Harbin 150001 Peoples R China

Hypo- and hyper-eutectic At-Si alloys were rapidly solidified from the tow or high temperature melt using water quenching and melt-spinning technique. The differences in microstructure of rapid solidification alloys were studied by scanning and transmission electron microscopy, and X-ray diffraction methods. The primary silicon in the Al-22(wt pct)Si alloy quenched in room temperature water from high temperature melt was smaller than that quenched from low temperature melt. Compared with the ribbons spun from low temperature melt, the ribbons spun from high temperature melt had finer Al-rich and Si-rich phase particles in either Al-7(wt pct)Si or Al-18(wt pct)Si alloy. The mechanism was explained by the nature of the liquid structure.

关键词： Aluminum alloys

Groundwater Flow Modelling of Galma Basin, Nigeria： Using Finite Element Method

在线全文

学校读者我要写书评

暂无评论

journal of Environmental Science and Engineering 2011年第3期5卷 247-252页

作者： I.o. olaniyan j.C. Agunwamba j.o. Ademiluyi Department of Agricultural Engineering Kaduna Polytechnic Nigeria Department of Civil Engineering University of Nigeria Nsukka 00176-0000 Nigeria

The groundwater flow characteristics of the Galma River Basin were simulated numerically by using the finite element method. The two-dimensional partial differential equation governing transient flow in an unconfined aquifer was modified to incorporate the effect of precipitation as a measurable source as it affects groundwater flow, such that for a given amount of precipitation over the basin, the flow of groundwater can be predicted at any point in the basin. With appropriate initial and boundary conditions, the modified equation was solved and the solution programmed for computer run. After calibration and verification, the borehole hydraulic data for the basin was used to predict flow due to groundwater hydraulic heads for 20 years. Findings revealed that there is a direct correlation of 0.79 and a strong linear relationship between simulated and observed hydraulic heads, and that data availability and choice of appropriate initial and boundary conditions are significant for good numerical modelling results. The contour plot of the hydraulic heads showed variation of heads from higher values at the upstream to lower values downstream, and groundwater flow follows the natural topography of the land from the upstream end of the basin towards the main streams and Galma River.

关键词： Groundwater flow river basin precipitation finite element hydraulic head.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

犯罪的紧张理论和差别机会理论

当代青年研究 1993年第1期 38-40,22页

作者： j.o.芬克诺朱超北京大学法律系

一、他们缺乏通过合法手段实现合法目标的机会法国社会学家埃米尔·杜尔凯姆使用异常或失范的概念来解释越轨行为。一般认为,异常意味着在一定的社会条件下,例如在社会发生急剧变迁时期。

关键词：紧张理论青少年犯罪者越轨行为犯罪行为犯罪亚文化教育机会社会结构合法手段社会规范