检索结果-南通市图书馆

Physiological and perceptual responses to sprint interval exercise using arm versus leg cycling ergometry

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

Sports Medicine and Health Science 2024年第4期6卷 385-393页

作者： Todd A.Astorino Shealin pierce Madisen B.Piva Richard S.Metcalfe Niels B.J.Vollaard Department of Kinesiology CSU—San MarcosSan MarcosCAUSA Applied Sports TechnologyExercise and Medicine(A-STEM)Research CenterSwansea UniversitySwanseaUK Faculty of Health Sciences and Sport University of StirlingStirlingUK

Increases in power output and maximal oxygen consumption(V_O2max)occur in response to sprint interval exercise(SIE),but common use of“all-out”intensities presents a barrier for many ***,lower-body SIE is not feasible for all *** compared physiological and perceptual responses to supramaximal,but“nonall-out”SIE between leg and arm cycling ***-four active adults(mean±SD age:[25±7]y;cycling VO_(2)max:[39±7]mL·kg^(-1)·min^(-1))performed incremental exercise using leg(LCE)and arm cycle ergometry(ACE)to determine VO_(2)max and maximal work capacity(Wmax).Subsequently,they performed four 20 s bouts of SIE at 130% Wmax on the LCE or ACE at cadence=120-130 rev/min,with 2 min recovery between *** exchange data,heart rate(HR),blood lactate concentration(BLa),rating of perceived exertion(RPE),and affective valence were *** showed significantly lower(pgnificantly higher(pgnificantly higher([7.0±1.7]mM vs.[5.7±1.5]mM,p=0.024,d?0.83)for LCE versus *** was no significant effect of modality on RPE or affective valence(p>0.42),and lowest affective valence recorded(2.0±1.8)was considered“good to fairly good”.Data show that non“all-out”ACE elicits lower absolute but higher relative HR and VO_(2) compared to *** aversive perceptual responses could make this non-all-out modality feasible for inactive adults.

关键词： High intensity interval training Upper body exercise Peak power output Oxygen uptake Blood lactate concentration

典型结构功能一体化复合材料的设计与制备技术

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

复合材料学报 2024年第9期41卷 4457-4477页

作者：蒋民强胡东源董晨昊 pierce Robert RUDD Chris 刘晓玲益小苏宁波诺丁汉大学理工学院长三角碳纤维及复合材料技术创新中心丹麦技术大学风力与能源系统学院

在碳纤维增强树脂基复合材料轻量化与结构性能持续提高的前提下，同时附加其特定的功能，尤其是在不损失、甚至提升其层间断裂韧性的情况下，不仅可以弥补结构复合材料天然的缺陷，例如树脂基体的电绝缘性，也可以使其满足特定产品的要... 详细信息

在碳纤维增强树脂基复合材料轻量化与结构性能持续提高的前提下，同时附加其特定的功能，尤其是在不损失、甚至提升其层间断裂韧性的情况下，不仅可以弥补结构复合材料天然的缺陷，例如树脂基体的电绝缘性，也可以使其满足特定产品的要求，例如高刚度兼具一定的吸声降噪特性等。显然，对于航空航天这样的尖端应用领域，这种功能附加或结构功能一体化的复合材料技术对航空航天技术的未来发展至关重要。本文介绍了4种具有典型性的结构功能一体化复合材料的设计、制备与性能研究，分别是基于层间功能化插层和基于内织导电纬纱的导电增韧一体化复合材料及多级孔碳化棉纤维填充蜂窝/微穿孔面板的夹芯复合材料结构和编织布/无纺纤维毡复合材料片材折叠成型的结构吸声一体化复合材料。前两种材料分别通过在复合材料富树脂的层间插入导电功能化插层和在复合材料内引入贯通整个材料的导电纬纱网络实现了复合材料的导电性能与层间韧性的同步提高，而后两种材料则分别通过多级孔结构的碳化棉纤维材料填充蜂窝/微穿孔面板夹芯技术和编织布/无纺纤维毡复合材料片材的折叠技术实现了良好的吸声性能等，以展示多尺度、多层次结构设计和制备技术在结构复合材料功能化集成和结构功能一体化方面的应用。

关键词：碳纤维增强复合材料多功能复合材料导电增韧吸声

可手术的非小细胞肺癌:动态增强螺旋CT容积扫描与肿瘤缺氧免疫组化指标对照研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2012年第5期 490-490页

作者： H.C.Mandeville Q.S.Ng F.M.Daley P.R.Barber g.pierce J.Finch 杨楠楠 Mount Vernon Cancer Centre NorthwoodEngland

摘要目的分析非小细胞肺癌(non-small cell lung cancer,NSCLC)检查中动态对比增强(dynamic contrast material-enhanced,DCE)螺旋CT结果与肿瘤缺氧免疫组化指标的关系。材料与方法本研究经过伦理委员会许可,20例临床怀疑NSCLC病人于术... 详细信息

摘要目的分析非小细胞肺癌(non-small cell lung cancer,NSCLC)检查中动态对比增强(dynamic contrast material-enhanced,DCE)螺旋CT结果与肿瘤缺氧免疫组化指标的关系。材料与方法本研究经过伦理委员会许可,20例临床怀疑NSCLC病人于术前24h接受全肿瘤DCECT扫描并行动力学建模(Patlak分析)。根据扫描数据,推算出胸腔引流量[mL/(100mL·min)]及血容量(mL/100mL)。

关键词：非小细胞肺免疫组化 NSCLC CT 螺旋

Forecasting vulnerability of deep extraction level excavations to drawinduced cave loads

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and geotechnical Engineering 2019年第3期11卷 527-534页

作者： Matthew E.pierce pierce Engineering

Block and panel caving methods are increasingly used for mining of large and strong orebodies at large depths below the ground surface (>1 km). This paper focuses on the production phase of caving when the extraction level is fully developed and subjected to the weight of overlying caved material. A limit equilibrium solution for estimation of cave loads is critically reviewed and combined with existing empirical tools in order to forecast extraction level performance under cave loading. The analysis results, presented in nomogram form, suggest that the risk of severe squeezing of extraction level tunnels does not increase with cave depths below 500-1000 m due to the beneficial effects of arching. Under normal extraction ratios (ER = ~50%), severe squeezing experienced from cave loads in deep mines appears to be unlikely in all but the weakest rock masses (σcm global strength), even with poor draw control or low drawpoint availability. The likelihood of severe squeezing is greater when large draw areas (HR = 50-75 m, where HR is the hydraulic radius) are combined with low drawpoint availability or poor draw control and locally higher extraction ratios (ER = ~75%), even in better quality rock (σcm = 5-10 MPa). The analysis results are back-analyzed with the extraction level performance before and after a doubling production of rate and draw area at the deep ore zone (DOZ) mine in Indonesia. The extraction level conditions predicted by the nomograms correlate well with the experience at the DOZ, in which extraction level damage increases significantly over the production rampup, accompanied by a significant drop in drawpoint availability.

关键词： Block caving Panel caving Extraction level Draw control Squeezing

Forecast Hesitancy: Why are People Reluctant to Believe, Accept, or Respond to Various Weather, Water, and Climate Hazard-Related Forecasts?

在线全文

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2021年第4期12卷 600-609页

作者： Michael H.glantz gregory E.pierce Consortium for Capacity Building(CCB) Institute for Arctic and Alpine Research(INSTAAR)University of ColoradoBoulderCO80301USA

Current discussions of the social phenomenon of“vaccine hesitancy”with regard to Covid-19 provide an opportunity to use hesitancy as a means to shift thinking about untimely and delayed responses to forecasts of hydrometeorological ***,that is,provides a paradigm through which such regrettably delayed responses to hydromet hazards might be better understood and effectively *** exaggeration,just about every hydromet event provides an example of how hesitancy hinders individual,community,and national government risk-reducing preventive and mitigative responses to forecasts of foreseeable,relatively near-term climate,water,or weather *** for such hesitancy(for vaccine and forecast use alike)include—among others—lack of trust in the science,lack of confidence in government,and persistent concern about the uncertainties that surround forecasting—both meteorological and public *** such,a better understanding of the causes that lead to individual and group hesitancy can better inform hydromet forecasters and affected communities about ways in which beneficial actions in response to timely forecasts are often *** better understanding will facilitate,where necessary,targeted interventions to enhance the societal value of forecasting by reducing this long-observed challenge of“forecast hesitancy.”First,this article focuses on incidents of“vaccine hesitancy”that,for various reasons,people around the world are even now experiencing with regard to several now-available,and confirmed efficacious,Covid-19 *** of such incidents of indecisiveness first increased dramatically over the first few months of 2021,despite the strong scientific confidence that vaccination would significantly lower personal risk of contracting as well as spreading the ***,the notion of forecast hesitancy with regard to hydrometeorological hazards is discussed.

关键词： Disaster risk reduction Forecast Forecast hesitancy Hesitancy Hydromet hazards Vaccine hesitancy

An adaptive range-query optimization technique with distributed replicas

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2014年第1期21卷 190-198页

作者： Sayar Ahmet pierce Marlon Fox C.geoffrey Department of Computer Engineering Kocaeli University Department of Computer Science Indiana University Community grids Lab Indiana University School of Informatics and Computing Indiana University

Replication is an approach often used to speed up the execution of queries submitted to a large dataset.A compile-time/run-time approach is presented for minimizing the response time of 2-dimensional range when a distributed replica of a dataset *** aim is to partition the query payload(and its range) into subsets and distribute those to the replica nodes in a way that minimizes a client's response ***,since query size and distribution characteristics of data(data dense/sparse regions) in varying ranges are not known a priori,performing efficient load balancing and parallel processing over the unpredictable workload is difficult.A technique based on the creation and manipulation of dynamic spatial indexes for query payload estimation in distributed queries was *** effectiveness of this technique was demonstrated on queries for analysis of archived earthquake-generated seismic data records.

关键词： distributed systems load balancing range query query optimization

Agent-based models reveal limits of mark-release-recapture estimates for the rare butterfly, Bhutanitis thaidina (Lepidoptera: Papilionidae)

在线全文

学校读者我要写书评

暂无评论

Insect Science 2022年第2期29卷 550-566页

作者： Zhengyang Wang Yuanheng Li Anuj Jain Naomi E.pierce Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology Harvard UniversityCambridgeMA 02138 USA

Insect diversity and abundance are in drastic decline worldwide,but quantifying insect populations to better conserve them is a difficult ***-release-recapture(MRR)is widely used as an ecological indicator for insect populations,but the accuracy of MRR estimates can vary with factors such as spatial scale,sampling effort and models of *** conducted a 3-year MRR study of *** in Yanzigou valley,*** but failed to obtain sufficient data for a robust population *** prompted us to integrate *** life history information to parameterize agent-based models and evaluate the conditions under which successful MRR studies could be *** evaluated:(1)the performance of MRR models under different landscape types,and(2)the influence of experimental design on the accuracy and variance of MRR-based *** simulations revealed systematic underestimates of true population parameters by MRR models when sampling effort was *** a total of 2772 simulations,subjective decisions in sampling protocol(e.g.,frequency,number of sampling locations,use of spatially explicit models,type of estimands)accounted for nearly half of the variation in *** conclude that MRR-based estimates could be improved with the addition of more field-specific parameters.

关键词： agent-based simulation Aristolochia moupinensis habitat hostplant landscape Mt.gongga program MARK spatially explicit capture-recapture(SECR)

Simulating Resin Infusion through Textile Reinforcement Materials for the Manufacture of Complex Composite Structures

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

Engineering 2017年第5期3卷 596-607页

作者： Robert S. pierce Brian g. Falzon Northern Ireland Advanced Composites and Engineering Centre Belfast BT3 9DZ UK School of Mechanical and Aerospace Engineering Queen's University Belfast Belfast BT9 5AH UK

Increasing demand for weight reduction and greater fuel efficiency continues to spur the use of composite materials in commercial aircraft structures. Subsequently, as composite aerostructures become larger and more complex, traditional autoclave manufacturing methods are becoming prohibitively expensive. This has prompted renewed interest in out-of-autoclave processing techniques in which resins are introduced into a reinforcing preform. However, the success of these resin infusion methods is highly dependent upon operator skill and experience, particularly in the development of new manufacturing strategies for complex parts. Process modeling, as a predictive computational tool, aims to address the issues of reliability and waste that result from traditional trial-and-error approaches. Basic modeling attempts, many of which are still used in industry, generally focus on simulating fluid flow through an isotropic porous reinforcement material. How- ever, recent efforts are beginning to account for the multiscale and multidisciplinary complexity of woven materials, in simulations that can provide greater fidelity. In particular, new multi-physics process models are able to better predict the infusion behavior through textiles by considering the effect of fabric deformation on permeability and porosity properties within the reinforcing material. In addition to reviewing pre- vious research related to process modeling and the current state of the art, this paper highlights the recent validation of a multi-physics process model against the experimental infusion of a complex double dome component. By accounting for deformation-dependent flow behavior, the multi-physics process model was able to predict realistic flow behavior, demonstrating considerable improvement over basic isotropic permeability models.

关键词： Composite materials Textile reinforcement Draping Infusion Numerical modeling