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A brief history of the compendium of Physical Activities

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Journal of Sport and Health Science 2024年第1期13卷 3-5页

作者： Barbara E.Ainsworth Stephen D.Herrmann David r.Jacobs jr. Melicia c.Whitt-Glover.catrine Tudor-Locke School of Exercise and Health Shanghai University of SportShanghai 200438China college of Health Solutions Arizona State UniversityPhoenixAZ 85003USA Kansas center for Metabolism and Obesity research University of Kansas Medical CenterKansas CityKS 66160USA Division of Epidemiology and community Health University of MinnesotaMinneapolisMN 55455USA Gramercy research Group KnightdaleNC 27545USA college of Health and Human Services University of North Carolina at CharlotteCharlotteNC 28223USA

The compendium of Physical Activities(compendium)was developed to address consistent assignment of physical activity(PA)intensity values used in PA epidemiology research of the association between PA and health outcomes.1The known protective effects of PA on incident health outcomes tr.ces to the mid-1900s,with over 50 studies examining coronary heart disease(cHD)as the outcome of interest.

关键词： epidemiology Activities protective

An integrated portable bio-monitoring system based on tough hydrogels for.comprehensive detection of physiological activities

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Nano research 2024年第1期17卷 321-332页

作者： congcong Yang chenchen Ji Fengjiao Guo chunjiang Jin Hongyu mi Zhongchang Wang State Key Laboratory of chemistry and Utilization of carbon Based Energy resources School of Chemical Engineering and TechnologyXinjiang UniversityUrumqi 830017China International Iberian Nanotechnology Laboratory(INL) Avenide Mestre Jose VeigaBraga 4715-330Portugal

Advanced soft ion-conducting hydrogels have been developed rapidly in the integrated portable health monitoring equipment due to their higher sensitivity,sensory traits,tunable conductivity,and stretchability for physiological activities and personal healthcare ***,traditional hydrogel conductors are normally susceptible to large deformation and strong mechanical stress,which leads to inferior electro-mechanical stability for real application ***,a strong ionically conductive hydrogel(poly(vinyl alcohol)-bor.c acid-glycerol/sodium alginate-calcium chloride/electrolyte ions(PBG/Sc/EI))was designed by engineering the covalently and ionically crosslinked networks followed by the salting-out effect to further enhance the mechanical strength and ionic conductivity of the *** to the collective effects of the energy-dissipation mechanism and salting-out effect,the designed PBG/Sc/EI with excellent str.ctural integrity and robustness exhibits exceptional mechanical properties(elongation at break for 559.1%and tensile strength of 869.4 kPa)and high ionic conductivity(1.618 S·m^(-1)).As such,the PBG/Sc/EI strain sensor features high sensitivity(gauge factor=2.29),which can effectively monitor various kinds of human motions(joint motions,facial micro-expression,faint respiration,and voice r.cognition).Meanwhile,the hydrogel-based Zn||MnO_(2)battery delivers a high capacity of 267.2 mAh·g^(-1)and a maximal energy density of 356.8 Wh·kg^(-1)associated with good cycle performance of 71.8%capacity retention after 8000 ***,an integrated bio-monitoring system with the sensor and Zn||MnO_(2)battery can accurately identify diverse physiological activities in a real-time and non-invasive *** work presents a feasible strategy for designing high-performance conductive hydrogels for highly-reliable integrated bio-monitoring systems with excellent pr.cticability.

关键词： Ionically conductive hydrogel strain sensor Zn-based battery integrated bio-monitoring system human motion monitoring

2024 Adult compendium of Physical Activities:A third update of the energy costs of human activities

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Journal of Sport and Health Science 2024年第1期13卷 6-12页

作者： Stephen D.Herrmann Erik A.Willis Barbara E.Ainsworth Tiago V.Barreira Mary Hastert chelsea L.Kr.cht John M.Schuna jr. Zhenghui cai minghui Quan catrine Tudor-Locke Melicia c.Whitt-Glover David r. Jacobs jr. Kansas center for Metabolism and Obesity research University of Kansas Medical CenterKansas CityKS 66160USA Division of Physical Activity and Weight Management Department of Internal MedicineUniversity of Kansas Medical CenterKansas CityKS 66160USA center for Health Promotion and Disease Prevention University of North Carolina at Chapel HillChapel HillNC 27599USA college of Health Solutions Arizona State UniversityPhoenixAZ 85003USA School of Exercise and Health Shanghai University of SportShanghai 200438China Exercise Science Department Syracuse UniversitySyracuseNY 13244USA clinical Sciences Division Pennington Biomedical Research CenterBaton RougeLA 70808USA School of Exercise and Sport Science Oregon State UniversityCorvallisOR 97331USA college of Health and Human Services University of North Carolina at CharlotteCharlotteNC 28223USA Gramercy research Group KnightdaleNC 27545USA Division of Epidemiology and community Health School of Public HealthUniversity of MinnesotaMinneapolisMN 55454USA

Background:The compendium of Physical Activities was published in 1993 to improve the comparability of energy expenditure values assigned to self-reported physical activity(PA)across *** original version was updated in 2000,and again in 2011,and has been widely used to support PA research,pr.ctice,and public health ***:This 2024 update was tailored for adults 19-59 years of age by removing data from those≥60 *** a systematic review and supplementary searches,we identified new activities and their associated measured metabolic equivalent(MET)values(using indir.ct calorimetry)published since *** replaced estimated METs with measured values when ***:We screened 32,173 abstr.cts and 1507 full-text papers and extr.cted 2356 PA energy expenditure values from 701 *** added303 new PAs and adjusted 176 existing MET values and descriptions to reflect the addition of new data and removal of METs for older *** added a Major Heading(Video Games).The 2024 Adult compendium includes 1114 PAs(912 with measured and 202 with estimated values)across 22 Major ***:This comprehensive update and refinement led to the creation of The 2024 Adult compendium,which has utility across research,public health,education,and healthcare domains,as well as in the development of consumer health *** new website with the complete lists of PAs and supporting resources is available at https://***.

关键词： Adults Energy expenditure Exercise MET Physical Activities

Improving mechanical properties and high-temperature oxidation of press hardened steel by adding cr and Si

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International Journal of minerals,Metallurgy and Materials 2024年第8期31卷 1865-1875页

作者： rong Zhu Yonggang Yang Baozhong Zhang Borui Zhang Lei Li Yanxin Wu Zhenli mi National Engineering research center for Advanced rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing 102206China Manufacturing Management Department Ningbo Iron&Steel Co.Ltd.Ningbo 315800China Hunan Valin Lianyuan Iron and Steel co. Ltd.Loudi 417009China

This work investigated the effect of cr and Si on the mechanical properties and oxidation resistance of press hardened *** indicated that the microstr.cture of the cr-Si micro-alloyed press hardened steel consisted of lath martensite,M_(23)c_(6)carbides,and retained *** retained austenite and carbides are responsible for the increase in elongation of the micro-alloyed *** addition,after oxidation at 930℃for 5 min,the thickness of the oxide scales on the cr-Si micro-alloyed press hardened steel is less than 5μm,much thinner than 45.50μm-thick oxide scales on *** oxide scales of the cr-Si micro-alloyed steel are composed of Fe_(2)O_(3),Fe_(3)O_(4),mixed spinel oxide(Fecr_(2)O_(4)and Fe_(2)SiO_(4)),and amorphous SiO_(2).Adding cr and Si significantly reduces the thickness of the oxide scales and prevents the generation of the FeO *** to the increase of spinel Fecr_(2)O_(4)and Fe_(2)SiO_(4)phase in the inner oxide scale and the amorphous SiO_(2)close to the substrate,the oxidation resistance of the cr-Si micro-alloyed press hardened steel is improved.

关键词： cr-Si micro-alloyed press hardened steel mechanical properties oxidation resistance amorphous SiO_(2)

Ultra-high specific surface area activated carbon from Taihu cyanobacteria via KOH activation for enhanced methylene blue adsorption

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chinese Journal of chemical Engineering 2024年第3期67卷 106-116页

作者： Yifang mi Wenqiang Wang Sen Zhang Yalong Guo Yufeng Zhao Guojin Sun Zhihai cao Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering research center for Eco-Dyeing&Finishing of Textiles Ministry of EducationZhejiang Provincial Engineering Research Center for Green and Low-carbon Dyeing&FinishingZhejiang Sci-Tech UniversityHangzhou 310018China Key Laboratory for Technology in rural Water Management of Zhejiang Province Zhejiang University of Water Resources and Electric PowerHangzhou 310018China

cyanobacteria-based activated carbon(cBAc)was successfully prepared by pyrolysis-activation of Taihu *** the impregnation ratio and activated temperature were 2 and 800-c,respectively,the optimal cBAcs possessed an ultra-high specific surface(2178.90 m^(2)·g^(-1))and plenty of micro-and meso-pores,as well as a high pore volume(1.01 cm^(3)·g^(-1)).Ascribed to ultra-high surface area,π-π inter.ction,electrostatic inter.ction,as well as hydrogen-bonding inter.ctions,the cBAcs displayed huge superiority in efficient dye *** saturated methylene blue adsorption capacity by cBAcs could be as high as 1143.4 mg·g^(-1),superior to that of other reported biomass-activated *** adsorption was endothermic and modeled well by the pseudo-second-order kinetic,intra-particle diffusion,and Langmuir *** work presented the effectiveness of Taihu cyanobacteria adsorbent ascribed to its super large specific surface area and high adsorption ability.

关键词： Activated carbon Biomass Dye adsorption Taihu cyanobacteria

capacitorless Solid-state Power Filter for Single-phase Dc-Ac converters

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cES Transactions on Electr.cal Machines and Systems 2024年第3期 367-377页

作者： Haitham Kanakri Euzeli c. Dos Santos, jr. IEEE Purdue University Electrical and Computer Engineering Department

converters rely on passive filtering as a cr.cial element due to the high-frequency operational char.cteristics of power electronics. Traditional filtering methods involve a dual inductor.capacitor(Lc) cell or an inductor.capacitor-inductor(LcL) T-circuit. However, capacitors are susceptible to wear-out mechanisms and failure modes. Nevertheless, the necessity for monitoring and regular replacement adds to an elevated cost of ownership for such systems. The utilization of an active output power filter.can be used to diminish the dimensions of the Lc filter and the electrolytic dc-link capacitor, even though the inclusion of capacitors remains an indispensable part of the system. This paper introduces capacitorless solid-state power filter(SSPF) for single-phase dc-ac converters. The proposed configuration is capable of generating a sinusoidal ac voltage without relying on capacitors. The proposed filter, composed of a planar transformer and an H-bridge converter operating at high frequency, injects voltage harmonics to attain a sinusoidal output voltage. The design parameters of the planar transformer are incorporated, and the impact of magnetizing and leakage inductances on the operation of the SSPF is illustrated. Theoretical analysis, supported by simulation and experimental results, are provided for a design example for a single-phase system. The total harmonic distortion observed in the output voltage is well below the IEEE 519 standard. The system operation is experimentally tested under both steady-state and dynamic conditions. A comparison with existing technology is presented, demonstrating that the proposed topology reduces the passive components used for filtering.

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Uncovering hidden nodes and hidden links in complex dynamic networks

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Science china(Physics,Mechanics & Astronomy) 2024年第4期67卷 51-63页

作者： Zhaoyang Zhang Xinyu Wang Haihong Li Yang chen Zhilin Qu Yuanyuan mi Gang Hu Department of Physics School of Physical Science and TechnologyNingbo UniversityNingbo 315211China School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China Department of Medicine David Geffen School of MedicineUniversity of CaliforniaLos Angeles 90095USA Brainnetome center and National Laboratory of Pattern r.cognition Institute of AutomationChinese Academy of SciencesBeijing 100190China Department of Psychology Tsinghua UniversityBeijing 100084China Department of Physics Beijing Normal UniversityBeijing 100875China

Inferring network str.ctures from available data has attr.cted much interest in network science;however,in many realistic networks,only some of the nodes are perceptible while others are hidden,making it a challenging *** this work,we develop a method for r.constr.cting the network with hidden nodes and links,taking account of fast-varying noise and time-delay *** calculating the correlations of available data with different derivative orders for multiple pairs of accessible nodes,analyzing and integrating the relationships between different correlations,and defining diverse hidden-node-related r.constr.ction motifs,we can effectively identify the hidden nodes and hidden links in the network.

关键词： networks and genealogical trees stochastic analysis methods time series analysis

Two birds with one stone:Functionalized wood composites for efficient photocatalytic hydrogen production and solar water evaporation

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chinese chemical Letters 2024年第9期35卷 392-397页

作者： Deqi Fan Yicheng Tang Yemei Liao Yan mi Yi Lu Xiaofei Yang college of chemical Engineering Nanjing Forestry UniversityNanjing 210037China Jiangsu co-Innovation center of Efficient Pr.cessing and Utilization of Forest resources International Innovation Center for Forest Chemicals and MaterialsCollege of ScienceNanjing Forestry UniversityNanjing 210037China Key Laboratory of chemistry and Engineering of Forest Products State Ethnic Affairs CommissionGuangxi Key Laboratory of Chemistry and Engineering of Forest ProductsGuangxi Minzu UniversityNanning 530006China

Maximizing solar energy utilization is a persistent challenge in photo catalysis,which determines sustainable solar-driven photocatalytic *** thermal-coupled photo catalysis is considered as a promising solution to tackle the issues of sustainable energy scarcity and environmental pollution by harvesting the full-spectrum solar ***,a highly efficient photo thermal-accelerated photo catalysis system is elaborately established,in which the assembled carbonized stick/Nb_(2)c MXene evaporator.can heat water into vapor and the integrated g-c_(3)N_(4)photocatalyst further enables high-efficiency photocatalytic hydrogen *** designed hyperboloid wood-based architecture possesses a multiphase interface of water steam/catalyst/hydrogen to reduce the transport resistance of hydrogen gas in liquid and ultimately maximize the output of hydrogen ***,this coupled photothermal-photocatalytic system achieves a stable solar evaporation rate of 2.16 kg m^(-1)h^(-1)under one sun irradiation and highly efficient hydrogen-evolving rate of 3096μmol g^(-1)h^(-1).This work paves a way to explore the improvement of photocatalytic hydrogen production by synergic photothermal effect for potential applications in renewable solar energy utilization and hydrogen production.

关键词： Photocatalysis Photothermal Nb_(2)c MXene g-c_(3)N_(4) Wood

An in-situ self-etching enabled high-power electrode for aqueous zinc-ion batteries

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Journal of Energy chemistry 2024年第1期88卷 399-408,I0009页

作者： Shuang Hou Dingtao Ma Yanyi Wang Kefeng Ouyang Sicheng Shen Hongwei mi Lingzhi Zhao Peixin Zhang college of chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongChina Guangdong Provincial Engineering Technology research center for Low carbon and Advanced Energy Materials School of Semiconductor Science and TechnologySouth China Normal UniversityFoshan 528225GuangdongChina ScNU Qingyuan Institute of Science and Technology Innovation co. Ltd.Qingyuan 511517GuangdongChina

Sluggish storage kinetics is considered as the main bottleneck of cathode materials for fast-charging aqueous zinc-ion batteries(AZIBs).In this report,we propose a novel in-situ self-etching strategy to unlock the Palm tree-like vanadium oxide/carbon nanofiber membrane(P-VO/c)as a robust freestanding *** investigations including the finite element simulation,in-situ X-ray diffr.ction,and in-situ electr.chemical impedance spectroscopy disclosed it an electr.chemically induced phase transformation mechanism from VO to layered Zn_(x)V_(2)O_5·nH_(2)O,as well as superior storage kinetics with ultrahigh pseudocapacitive *** demonstrated,such electrode can remain a specific capacity of 285 mA h g^(-1)after 100 cycles at 1 A g^(-1),144.4 mA h g^(-1)after 1500 cycles at 30 A g^(-1),and even 97 mA h g^(-1)after 3000 cycles at 60 A g^(-1),***,an impressive power density of 78.9 kW kg^(-1)at the super-high current density of 100 A g^(-1)also can be *** design concept of in-situ self-etching free-standing electrode can provide a brand-new insight into extending the pseudocapacitive storage limit,so as to promote the development of high-power energy storage devices including but not limited to AZIBs.

关键词： In-situ self-etching Free-standing electrode Pseudocapacitive storage High-power Zinc-ion batteries