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

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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

Tunnel geometry of the subterranean termite Reticulitermes grassei （Isoptera： Rhinotermitidae）in response to sand bulk density and the presence of food

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Insect Science 2007年第6期14卷 511-518页

作者： TANIA NOBRE LINA NUNES DAVID E. BIGNELL Laboratorio Nacional de Engenharia Civil Nucleo de Estruturas de Madeira Lisboa Portugal Queen Mary University of London School of Biological and Chemical Sciences London UK Institute of Tropical Biology and Conservation Universiti Malaysia Sabah Kota Kinabalu Sabah Malaysia

The cryptic habits of subterranean termites restricts detailed analysis of their foraging patterns in situ, but the process is evidently dominated by tunnel constructions connecting the nest with woody resources discovered within the territory of each colony. In this study, tunnel formation and orientation were studied experimentally in the termite Reticulitermes grassei （Clement）, using 2-dimensional laboratory foraging arenas con- taining fine sand as the substratum. The building of exploratory tunnels over a 10-day period and the geometry of the resulting network are described. Fractal analysis showed that tunnel geometry had a fractal dimension, regardless of the total length tunnelled whether foragers encountered the food source or not. The bulk density of the sand in the arenas affected the distances tunnelled, with higher density reducing construction, but did not affect tunnel geometry. Tunnels were not discernibly orientated with respect to the positioning of the food source, even in a situation where termites had failed to find the food source at a distance of less than 50 mm, suggesting that volatiles from wood are not attractants.

关键词： foraging gallery fractal analysis Reticulitermes grassei search pattern,subterranean termites tunnel geometry

Evolving paradigms in biological carbon cycling in the ocean

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National Science Review 2018年第4期5卷 481-499页

作者： Chuanlun Zhang Hongyue Dang Farooq Azam Ronald Benner Louis Legendre Uta Passow Luca Polimene Carol Robinson Curtis A.Suttle Nianzhi Jiao department of Ocean Science and Engineering Southern University of Science and Technology State Key Laboratory of Marine Environmental Science Institute of Marine Microbes and Ecospheres College of Ocean and Earth Sciences Xiamen University Scripps Institution of Oceanography University of California San Diego department of Biological sciences and school of the Earth Ocean and EnvironmentUniversity of South Carolina Sorbonne Université Laboratoired' Océanographie de Villefranche LOV 6. Marine Science Institute University of California Santa Barbara 7. Plymouth Marine Laboratory 8. School of Environmental SciencesUniversity of East Anglia 9. Departments of Earth Ocean and Atmospheric SciencesBotany and Microbiology and Immunology and the Institute for the Oceans and Fisheries University of British Columbia

Carbon is a keystone element in global biogeochemical *** plays a fundamental role in biotic andabiotic processes in the ocean,which intertwine to mediate the chemistry and redox status of carbon in the ocean and the *** interactions between abiotic and biogenic carbon(***2,Ca CO3,organic matter)in the ocean are complex,and there is a half-century-old enigma about the existence of a huge reservoir of recalcitrant dissolved organic carbon(RDOC)that equates to the magnitude of the pool of atmospheric *** concepts of the biological carbon pump(BCP)and the microbial loop(ML)shaped our understanding of the marine carbon *** more recent concept of the microbial carbon pump(MCP),which is closely connected to those of the BCP and the ML,explicitly considers thesignificance of the ocean’s RDOC reservoir and provides a mechanistic framework for the exploration of its formation and *** of the MCP has benefited from advanced‘omics’and novel research in biological oceanography and microbial *** need to predict the ocean’sresponse to climate change makes an integrative understanding of the BCP,ML and MCP a high *** this review,we summarize and discuss progress since the proposal of the MCP in 2010 and formulate research questions for the future.

关键词： biological carbon pump microbial loop microbial carbon pump ocean carbon cycle global climate change

Point-piezomagnetic Properties of the FeCuNbSiB Alloy Strips

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Journal of Wuhan University of Technology(Materials Science) 2009年第1期24卷 114-118页

作者：朱正吼 school of Materials sciences and Engineering Nanchang University

The piezomagnetic properties of rapidly quenched Fe73.5Cu1Nb3Si13.5B9 alloy strips were investigated in as-quenched state and after annealing for 2 h in vacuum in the temperature range of 100-300 ℃. The impedance of amorphous strips increases with frequency, and sensitively de-creases with stress increasing, especially in the frequency range of 10-100 MHz. The impedance in-creases approximately linearly with frequency below the critical frequency, but begins to decrease non-linearly with frequency above the critical frequency. The higher the point compressive stress is, the smaller the critical frequency will be. The stability of piezomagnetic properties is very excellent. The impedance of amorphous strips after annealing, especially at 300 ℃, decreases very strongly. The impedance and the absolute values of the sensitive degree of couple layers＇ amorphous strips are lower than those of single layer strips.

关键词： piezomagnetic properties amorphous strips impedance

Changes in Cinnamic Acid derivatives Associated with the Habituation of Maize Cells to Dichlobenil

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Molecular Plant 2011年第5期4卷 869-878页

作者： Hugo Melida Jesus Alvarez Jose Luis Acebes Antonio Encina Stephen C. Fry Area de Fisiologia Vegetal Facultad de CC Biologicas y Ambientales Universidad de Leon E-24071 Leon Spain Edinburgh Cell Wall Group Institute of Molecular Plant Sciences School of Biological Sciences University of Edinburgh Daniel Rutherford Building The King＇s Buildings Edinburgh EH9 3JH UK

The habituation of cell cultures to cellulose biosynthesis inhibitors such as dichlobenil （DCB） represents a valu- able tool to improve our knowledge of the mechanisms involved in plant cell wall structural plasticity. Maize cell lines habituated to lethal concentrations of DCB were able to grow through the acquisition of a modified cell wall in which cellulose was partially replaced by a more extensive network of arabinoxylans. The aim of this work was to investigate the phenolic metabolism of non-habituated and DCB-habituated maize cell cultures. Maize cell cultures were fed [14C]cinnamate and the fate of the radioactivity in different intra-protoplasmic and wall-localized fractions throughout the culture cycle was analyzed by autoradiography and scintillation counting. Non-habituated and habituated cultures did not markedly differ in their ability to uptake exogenous [14C]cinnamic acid. However, interesting differences were found in the radiolabeling of low- and high-Mr metabolites. Habituated cultures displayed a higher number and amount of radiola-beled low-Mr compounds, which could act as reserves later used for polysaccharide feruloylation. DCB-habituated cultures were highly enriched in esterified [14C]dehydrodiferulates and larger coupling products. In conclusion, an extensive and early cross-linking of hydroxycinnamates was observed in DCB-habituated cultures, probably strengthening their cellulose-deficient walls.

关键词： Cell wall Zea mays maize dichlobenil DCB dehydrodiferulate ferulate cinnamic acid.

COMPLETE MONOTONICITY OF THE PROBABILITY OF RUIN AND de FINETTI'S DIVIdeND PROBLEM

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Journal of Systems Science & Complexity 2012年第1期25卷 178-185页

作者： Hua DONG Chuancun YIN school of Mathematical sciences Qufu Normal University school of Mathematical Science and Computing Technology Central South University

This paper studies the complete monotonicity of the probability of ruin in the the classical risk model and the classical risk model that is perturbed by a diffusion. As a byproduct, the authors give an alternative p... 详细信息

关键词： Barrier strategy classical risk model complete monotonicity log-convexity optimaldividend problem perturbed classical risk model.

Prediction of blasting mean fragment size using support vector regression combined with five optimization algorithms

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第6期13卷 1380-1397页

作者： Enming Li Fenghao Yang Meiheng Ren Xiliang Zhang Jian Zhou Manoj Khandelwal school of Resources and Safety Engineering Central South UniversityChangsha410083China Universidad Politecnica de Madrid-ETSI Minas y Energia Rios Rosas 21Madrid28003Spain College of Locomotive and Rolling Stock Engineering Dalian Jiaotong UniversityDalian116028China department of Mathematics University of California Santa BarbaraSanta BarbaraCA93106USA State Key Laboratory of Safety and Health for Metal Mines Maanshan243000China school of Engineering Information Technology and Physical SciencesFederation University AustraliaBallaratVIC3350Australia

The main purpose of blasting operation is to produce desired and optimum mean size rock *** or fine fragments cause the loss of ore during loading and transportation,whereas large or coarser fragments need to be further processed,which enhances production ***,accurate prediction of rock fragmentation is crucial in blasting *** fragment size(MFS) is a crucial index that measures the goodness of blasting *** the past decades,various models have been proposed to evaluate and predict blasting *** these models,artificial intelligence(AI)-based models are becoming more popular due to their outstanding prediction results for multiinfluential *** this study,support vector regression(SVR) techniques are adopted as the basic prediction tools,and five types of optimization algorithms,*** search(GS),grey wolf optimization(GWO),particle swarm optimization(PSO),genetic algorithm(GA) and salp swarm algorithm(SSA),are implemented to improve the prediction performance and optimize the *** prediction model involves 19 influential factors that constitute a comprehensive blasting MFS evaluation system based on AI *** all the models,the GWO-v-SVR-based model shows the best comprehensive performance in predicting MFS in blasting *** types of mathematical indices,*** square error(MSE),coefficient of determination(R^(2)) and variance accounted for(VAF),are utilized for evaluating the performance of different prediction *** R^(2),MSE and VAF values for the training set are 0.8355,0.00138 and 80.98,respectively,whereas 0.8353,0.00348 and 82.41,respectively for the testing ***,sensitivity analysis is performed to understand the influence of input parameters on *** shows that the most sensitive factor in blasting MFS is the uniaxial compressive strength.

关键词： Blasting mean fragment size e-support vector regression(e-SVR) V-support vector regression(v-SVR) Meta-heuristic algorithms Intelligent prediction

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

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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

Assessing the prevalence of urogenital schistosomaisis and transmission risk factors amongst school-aged children around Mapedam ecological suburbs in Malantouen district,Cameroon

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Infectious Diseases of Poverty 2017年第1期6卷 360-367页

作者： Adeline P.Mewabo Roger S.Moyou Lysette E.Kouemeni Jeanne Y.Ngogang Lazare Kaptue Ernest Tambo department Biochemistry Higher Institute of Health SciencesUniversitedes MontagnesBangangteCameroon Institut de Recherches Medicales et d’Etudes des Plantes Medicinale-Centre de Recherches Medicales(IMPM-CRM) YaoundeCameroon Africa Disease Intelligence and Surveillance Communication and Response(Africa DISCoR)InstituteYaoundeCameroon

Background:Urogenital schistosomiasis is a parasitic infection of public health importance that affects over 112 million people *** study aimed at assessing the urogenital schistosomiasis prevalence and risk factors of transmission around Mape dam suburds in Malantouen district,West,***:The study was conducted using semi-structured pretested questionnaires to collect socio-demographic and ecological *** samples were also collected and used to confirm the prevalence of schistosomiasis in consented school-aged children in four primary schools between March-July ***’samples around the dam surburbs were also collected for taxonomy characterization and species *** were compiled and quality control assessed and analysed using SPSS version 17 and Epiinfo data 3.1.Pdered statistical ***:Questionnaires were administered to 229 pupils,with gender ratio of 1.04(m/f).The prevalence of schistosomiasis haematobium was 16.6%.Mambonko school site,which is the closest to the dam suburbs,registered the greatest prevalence rate of 40%.The age group beween 10-13 years was the most infected(18.3%)and boys were more infested than girls(21.0%vs.15.5%).Haematuria,urination pain,school absentiesm and poor performance were the major recorded complications in 39.5 and 26.3%males to female *** rate gender disparity documented is still poorly understood and Bulinus truncatus collected from Mambonko suburb as potential snail intermediate host requires further ***:Authors advocated that schools and dam suburds sustained and innovative community-based surveillance and response targeted interventions implementation are needed to inform and support decisionmaking policy,but also in improving effective contextual behavioural communication changes and MDA improved uptake measures on national schistosomiasis control and elimination in Cameroon.

关键词： Urogenital schistosomiasis Pupils Schistosoma haematobium Prevalence Risk factors Mape dam