检索结果-南通市图书馆

The effects of plyometric jump training on lower-limb stiffness in healthy individuals:A meta-analytical comparison

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 Sport and Health Science 2023年第2期12卷 236-245页

作者： Jason Moran Bernard Liew Rodrigo Ramirez-Campillo Urs Granacher Yassine Negra Helmi Chaabene school of Sport Rehabilitation and Exercise SciencesUniversity of EssexColchesterEssex CO43SQUK department of Physical Activity sciences Universidad de Los LagosOsorno 5290000Chile Division of Training and Movement Science University of PotsdamPotsdam 14469Germany higher Institute of Sport and Physical Education of Ksar Saı¨d University of Manouba Tunis 2037Tunisia High Institute of Sports and Physical Education of Kef University of JendoubaJendouba 8189Tunisia

Purpose:This study aimed to examine the effects of plyometric jump training(PJT)on lower-limb ***:Systematic searches were conducted in PubMed,Web of Science,and *** participants included healthy males and females who undertook a PJT programme isolated from any other training ***:There was a small effect size(ES)of PJT on lower-limb stiffness(ES=0.33,95%confidence interval(95%CI):0.07-0.60,z=2.47,p=0.01).Untrained individuals exhibited a larger ES(ES=0.46,95%CI:0.08-0.84,p=0.02)than trained individuals(ES=0.15,95%CI:-0.23 to 0.53,p=0.45).Interventions lasting a greater number of weeks(>7 weeks)had a larger ES(ES=0.47,95%CI:0.06-0.88,p=0.03)than those lasting fewer weeks(ES=0.22,95%CI:-0.12 to 0.55,p=0.20).Programmes with2 sessions per week(ES=0.20,95%CI:-0.10 to 0.50,p=0.18).Programmes with500 jumps per week had negative effects(ES=-0.22,95%CI:-1.10 to 0.67,p=0.63).Programmes with>7.5 jumps per set showed larger effect sizes(ES=0.55,95%CI:0.02-1.08,p=0.04)than those with7 weeks).

关键词： Jumps Stretch shortening cycle Tendon

Layered Coded Cache Placement and Cooperative delivery with Sharing Links in Satellite-Terrestrial Integrated Networks

在线全文

学校读者我要写书评

暂无评论

China Communications 2024年第3期21卷 217-229页

作者： Gu Shushi Chen Zihan Wu Yaonan Zhang Qinyu Wang Ye school of Electronic and Information Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Guangdong Provincial Key Laboratory of Aerospace Communication and Networking Technology Shenzhen 518055China Broadband Communications Research department Pengcheng LaboratoryShenzhen 518052China

Cooperative utilization of multidimensional resources including cache, power and spectrum in satellite-terrestrial integrated networks(STINs) can provide a feasible approach for massive streaming media content delivery over the seamless global coverage area. However, the on-board supportable resources of a single satellite are extremely limited and lack of interaction with others. In this paper, we design a network model with two-layered cache deployment, i.e., satellite layer and ground base station layer, and two types of sharing links, i.e., terrestrial-satellite sharing(TSS) links and inter-satellite sharing(ISS) links, to enhance the capability of cooperative delivery over STINs. Thus, we use rateless codes for the content divided-packet transmission, and derive the total energy efficiency(EE) in the whole transmission procedure, which is defined as the ratio of traffic offloading and energy consumption. We formulate two optimization problems about maximizing EE in different sharing scenarios(only TSS and TSS-ISS),and propose two optimized algorithms to obtain the optimal content placement matrixes, *** results demonstrate that, enabling sharing links with optimized cache placement have more than 2 times improvement of EE performance than other traditional placement schemes. Particularly, TSS-ISS schemes have the higher EE performance than only TSS schemes under the conditions of enough number of satellites and smaller inter-satellite distances.

关键词： coded content placement cooperative delivery energy efficiency sharing links STINs

Dramatic Difference Between Cu_(20)H_(8)and Cu_(20)H_(9)Clusters in Catalysis

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2024年第6期6卷 1581-1590页

作者： Chun-Yu Liu Tong-Yu Liu Zong-Jie Guan Song Wang Yuan-Yuan Dong Feng Hu de-en Jiang Quan-Ming Wang department of Chemistry Engineering Research Center of Advanced Rare Earth Materials(Ministry of Education)Tsinghua UniversityBeijing 100084 Jiangsu Engineering Research Centre for Digital Textile Inkjet Printing Key Laboratory of Eco-Textile Jiangnan UniversityMinistry of EducationWuxiJiangsu 214122 department of Chemical and Biomolecular Engineering Vanderbilt UniversityNashvilleTennessee 37235 department of Chemistry Vanderbilt UniversityNashvilleTennessee 37235 College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082 Hefei National Research Center for Physical sciences at the Microscale School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefeiAnhui 230026

Sensitivity to structure and composition is very challenging to establish in nanocatalysis due to inadequate definition of structures that are very close in *** synthesized a pair of atomically precise copper clusters that are very close in composition,[Cu_(20)H_(9)(Tf-dpf)_(10)]·BF4(Cu_(20)H_(9))and[Cu_(20)H_(8)(Tf-dpf)_(10)]·(BF_(4))_(2)(Cu_(20)H_(8)),by using a pyridyl-functionalized flexible amidinate ligand,N,N′-di(5-trifluoromethyl-2-pyridyl)*** one-hydride difference in their composition leads to significant variation in geometric and electronic structures and,consequently,distinctly different optical and catalytic ***_(20)H_(8)exhibits 25 times higher catalytic activity than Cu_(20)H_(9)(96.7%vs 3.7%in yield)in the selective hydrogenation of anα,β-unsaturated aldehyde(cinnamaldehyde)to saturated aldehyde(3-phenylpropanal).Electrospray ionization mass spectrometry combined with density functional theory calculations reveal that the greater ease of dissociation of one Tf-dpf ligand compared to Cu_(20)H_(8)is the key to its higher *** work demonstrates a clear case of structure and composition sensitivity in nanocatalysis and that one hydride,out of∼330 atoms in the nanoclusters,can make a huge difference in the catalytic *** insights will be useful in the design and synthesis of atomically precise nanocatalysts.

关键词： copper cluster hydride amidinate ligand structural transformation hydrogenation catalysis

Geochemical study of submicron particulate matter(PM1)in a metropolitan area

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2022年第1期13卷 417-429页

作者： Ismael L.Schneider Elba C.Teixeira Guilherme L.Dotto Diana Pinto Cheng-Xue Yang Luis F.O.Silva Postgraduate Program in Remote Sensing and Meteorology Universidade Federal do Rio Grande do SulAv.Bento Gonçalves9500 Porto AlegreRSBrazil department of Civil and Environmental Universidad de la CostaCUCCalle 58#55-66BarranquillaAtlanticoColombia Research department Fundação Estadual de Proteção Ambiental Henrique Luís RoesslerAv.Borges de Medeiros261Porto AlegreRSBrazil Chemical Engineering department Federal University of Santa Maria97105-900 Santa MariaBrazil school of Earth sciences and Resources China University of Geosciences BeijingBeijing 100083PR China departamento de Ingeniería Civil y Arquitectura Universidad de LimaAvenida Javier Prado Este 4600–Santiago de Surco 1503Perú

Air pollution has become a major problem in urban areas due to increasing industrialization and *** this study ambient concentrations of PM1 and metal concentrations as well as source contributions were identified and quantified by using Positive Matrix Factorization(PMF)in receptor modeling in the Metropolitan Area of Porto Alegre,*** PM1 samples were collected on PTFE filters from december 2012 to december 2014 in two sampling *** ion and trace element concentrations were *** average concentrations were 12.8 and 15.2μg/m^(3) for Canoas and Sapucaia do Sul sites,*** ion contributions of PM1 were secondary pollutants such as sulfate and *** elements,especially Cu,Pb,Zn,Cd,and Ni also made important contributions which are directly associated with anthropogenic *** results show significantly higher levels in winter than in *** of the PM1 and the analyzed PM species and elements originated from anthropogenic sources,especially road traffic,combustion processes and industrial activities,which are grouped in 7 major contributing sources.A back-trajectory analysis showed that the long-range transport of pollutants was not relevant in relation to the contribution to PM1 and metal *** work highlights the importance of urban planning to reduce human health exposure to traffic and industrial emissions,combined with awareness-raising actions for citizens concerning the impact of indoor sources.

关键词： PM1 Trace elements Source apportionment PMF Back trajectory

Neonates are more vulnerable to symptomatic SARS-CoV-2 infection than children:a matched cohort study in Brazil

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2022年第6期18卷 437-442页

作者： Char Leung Luisamanda Selle Karina Mary de Paiva Patricia Haas school of Clinical Medicine Addenbrooke’s HospitalUniversity of CambridgeHills RoadCambridgeCB20QQUK department of Speech Language and Hearing SciencesFederal University of Santa CatarinaFlorianópolisBrazil

As the causative agent of coronavirus disease 2019(COVID-19),severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)is one of the seven coronaviruses pathogenic to human and one of the four human coronaviruses that cause acute respiratory disease *** it affects people of all age groups,the risk of mortality is *** in many other diseases,elderly patients have a higher risk of infection,mortality,and morbidity[1].While it is a common belief that children fare better than adult and elderly,recent evidence merged that neonates and infants are associated with a higher risk of mortality and morbidity,compared to children and adolescents[2,3].For instance,a cross-country study found that the infection–fatality ratio of those agedhigher than those aged between 5 and 14 years of 0.001 despite lower than those aged between 20 and 59 that vary between 0.006 and 0.323[4].However,whether this holds true in the risk of infection is not yet *** this background,the present work aimed to verify whether neonates are more susceptible to COVID-19 using publicly available data of all polymerase chain reaction(PCR)tests performed in the state of São Paulo of Brazil.

关键词： mortality infection acute

Population structure and body condition of White-crested Elaenia(Elaenia albiceps)in relation to habitat in a modiffed Neotropical forest landscape

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Avian Research 2023年第2期14卷 160-165页

作者： Roberto F.Thomson Andrew G.Gosler Edward Grey Institute of Field Ornithology Department of ZoologyUniversity of OxfordSouth Parks RoadOX13PSOxfordUK Laboratorio de Ecología de Vida Silvestre Facultad de Ciencias Forestales y Conservacion de la NaturalezaUniversidad de ChileSanta Rosa#11315La PintanaRegion MetropolitanaChile Institute of Human sciences The Pauling Centre58a Banbury Rd.OxfordOX26QSUK

despite the widely accepted view that planted forests are valuable habitat for wildlife species,there is a lack of empirical evidence showing the suitability of this novel habitat,especially in relation to plantations of exotic tree ***,little is known about the effects of forest management on the ecology and dynamics of wild populations in the *** the breeding season,the migrant flycatcher White-crested Elaenia is the most abundant bird species in forested landscapes in *** several years we have studied different aspects of these artificial forests in the coastal range of south-central Chile as habitat for the species,particularly in contrast to the native *** general,our results indicate that plantation forests offer a poorer quality habitat,where the density of the species tends to be lower than in the native forest,although a significant edge effect suggests that its quality can be mitigated by planting as a matrix mosaic with native ***,compared to native forests,populations in plantations contained a higher proportion of younger adult individuals maintaining larger territories,and showing poorer body *** suggest that these differences could also have an impact on the birds'longevity and survival.

关键词： Body condition Migrant Planted forests Survival Temperate forests Territory

Tjong:A transformer‐based Mahjong AI via hierarchical decision‐making and fan backward

在线全文

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2024年第4期9卷 982-995页

作者： Xiali Li Bo Liu Zhi Wei Zhaoqi Wang Licheng Wu school of Information and Engineering Minzu University of ChinaBeijingChina Key Laboratory of Ethnic Language Intelligent Analysis and Security Governance of MOE Minzu University of ChinaBeijingChina department of Computer Science New Jersey Institute of TechnologyNewarkNew JerseyUSA

Mahjong,a complex game with hidden information and sparse rewards,poses significant *** Mahjong AIs require substantial hardware resources and extensive datasets to enhance AI *** authors propose a transformer‐based Mahjong AI(Tjong)via hierarchical decision‐*** utilising self‐attention mechanisms,Tjong effectively captures tile patterns and game dynamics,and it decouples the decision pro-cess into two distinct stages:action decision and tile *** design reduces de-cision complexity ***,a fan backward technique is proposed to address the sparse rewards by allocating reversed rewards for actions based on winning *** consists of 15M parameters and is trained using approximately 0.5 M data over 7 days of supervised learning on a single server with 2 *** action decision achieved an accuracy of 94.63%,while the claim decision attained 98.55%and the discard decision reached 81.51%.In a tournament format,Tjong outperformed AIs(CNN,MLP,RNN,ResNet,VIT),achieving scores up to 230%higher than its ***-more,after 3 days of reinforcement learning training,it ranked within the top 1%on the leaderboard on the Botzone platform.

关键词： decision making deep learning deep neural networks

The effects of plyometric jump training on physical fitness attributes in basketball players:A meta-analysis`

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 Sport and Health Science 2022年第6期11卷 656-670,F0003页

作者： Rodrigo Ramirez-Campillo Antonio García-Hermoso Jason Moran Helmi Chaabene Yassine Negra Aaron T.Scanlan department of Physical Activity sciences Universidad de Los LagosOsorno 5290000Chile Centro de Investigación en Fisiología del Ejercicio Facultad de CienciasUniversidad MayorSantiago 7500000Chile Navarrabiomed Complejo Hospitalario de Navarra(CHN)Universidad Pública de Navarra(UPNA)IdiSNAPamplona 31008Spain Laboratorio de Ciencias de la Actividad Física el Deporte y la SaludUniversidad de Santiago de ChileUSACHSantiago 9170020Chile school of Sport Rehabilitation and Exercise SciencesUniversity of EssexColchesterEssexCO43SQUnited Kingdom Division of Training and Movement sciences University of PotsdamPotsdam 14469Germany High Institute of Sports and Physical Education KefUniversity of JendoubaLa Manouba 8189Tunisia Research Unit(UR 17JS01 Sport PerformanceHealth&Society)Higher Institute of Sport and Physical Education of Ksar SaîdUniversity of“La Manouba”Rockhampton 2037Tunisia Human Exercise and Training Laboratory School of HealthMedical and Applied SciencesCentral Queensland UniversityRockhamptonQueenslandQLD 4702Australia

Background:There is a growing body of experimental evidence examining the effects of plyometric jump training(PJT)on physical fitness attributes in basketball players;however,this evidence has not yet been comprehensively and systematically ***,our objective was to meta-analyze the effects of PJT on physical fitness attributes in basketball players,in comparison to a control ***:A systematic literature search was conducted in the databases PubMed,Web of Science,and Scopus,up to July ***-reviewed controlled trials with baseline and follow-up measurements investigating the effects of PJT on physical fitness attributes(muscle power,i.e.,jumping performance,linear sprint speed,change-of-direction speed,balance,and muscle strength)in basketball players,with no restrictions on their playing level,sex,or ***’s g effect sizes(ES)were calculated for physical fitness *** a random-effects model,potential sources of heterogeneity were selected,including subgroup analyses(age,sex,body mass,and height)and single training factor analysis(program duration,training frequency,and total number of training sessions).Computation of metaregression was also ***:Thirty-two studies were included,involving 818 total basketball ***(pdent on vertical jump power(ES=0.45),countermovement jump height with(ES=1.24)and without arm swing(ES=0.88),squat jump height(ES=0.80),drop jump height(ES=0.53),horizontal jump distance(ES=0.65),linear sprint time across distances≤10 m(ES=1.67)and>10 m(ES=0.92),change-of-direction performance time across distances≤40 m(ES=1.15)and>40 m(ES=1.02),dynamic(ES=1.16)and static balance(ES=1.48),and maximal strength(ES=0.57).The meta-regression revealed that training duration,training frequency,and total number of sessions completed did not predict the effects of PJT on physical fitness *** analysis indicated greater improvement

关键词： Exercise therapy Human physical conditioning Resistance training Stretch reflex Team sports

Investigation of Nanoscale Scratching on Copper with Conical Tools Using Particle-Based Simulation

在线全文

学校读者我要写书评

暂无评论

Nanomanufacturing and Metrology 2023年第1期6卷 49-60页

作者： Anuj Sharma Sivakumar Kulasegaram Emmanuel Brousseau Kane Esien Dan Read school of Engineering Cardiff UniversityCardiff CF243AAUK school of Physics and Astronomy Cardiff UniversityCardiff CF243AAUK department of Electrical and Computer Engineering University of California Santa BarbaraSanta BarbaraCA 93106USA

In this study,a modeling approach based on smooth particle hydrodynamics(SPH)was implemented to simulate the nanoscale scratching process using conical tools with different negative rake *** implemented model enables the study of the topography of groove profiles,scratching forces,and the residual plastic strain beneath the *** elastoplastic material model was employed for the workpiece,and the tool–workpiece interaction was defined by a contact model adopted from the Hertz *** in-house Lagrangian SPH code was implemented to perform nano-scratching *** SPH simulation results were compared with nanoscale scratching experimental data available in the *** simulation results revealed that the normal force was more dominant compared to the cutting force,in agreement with experimental results reported for a conical tip tool with a 60°negative rake *** addition,the simulated groove profile was in good agreement with the groove profile produced in the aforementioned *** numerical simulations also showed that the normal and cutting forces increased with the increase in the scratching depth and rake *** the cutting and ploughing mechanisms were noticed in nano-scratching,the ploughing mechanism was more dominant for increased negative rake *** was also observed that residual plastic strain exists below the groove surface,and that the plastically deformed layer thickness beneath a scratched groove is larger for more negative values of the tool rake angle and higher scratching depths.

关键词： Nanoscale scratching SPH modeling Ploughing Cutting Groove profiles