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Isokinetic trunk flexion-extension protocol to assess trunk muscle strength and endurance:Reliability,learning effect,and sex differences

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Journal of Sport and Health Science 2020年第6期9卷 692-701页

作者： María Pilar García-Vaquero David Barbado Casto juan-Recio Alejandro lópez-Valenciano Francisco J.Vera-Garcia Sports Research Centre Miguel Hernandez University of ElcheElche03202Spain

Purpose:The purpose of this study was to examine the reliability and the learning effect of an isokinetic trunk flexion-extension protocol designed to simultaneously assess trunk muscle strength and *** addition,the effect of the participants’sex on the reliability data was ***:Fifty-seven healthy and physically active young men(n=28)and women(n=29)performed the isokinetic protocol 5 times,separated by a week between each of the first 4 sessions and by a month between the last 2 *** protocol consisted of performing 4 trials of 15 maximum flexion-extension concentric exertions at 120°/s(range of trunk motion=50°).The absolute and relative peak torque and total work were calculated to assess trunk flexion and extension *** addition,endurance ratio,modified endurance ratio,fatigue final ratio,recovery ratio,and modified recovery ratio variables were used for the assessment of trunk muscle endurance in both ***:Regarding the absolute reliability,no relevant changes were found between paired-comparison sessions for most strength and endurance variables,except for total work and relative total work variables in the flexion movement in both *** addition,the typical error of the isokinetic variables was lower than 10%in both males and females,and minimum detectable changes ranged from 7%to 20%,with a tendency to be higher in females and in endurance *** strength variables showed high-to-excellent intraclass correlation coefficients(ICCs;>0.74);however,for the endurance variables only the endurance ratio and the modified endurance ratio obtained moderate-to-high ICC values(0.57lysis of the variance reported no significant differences between consecutive pairs of sessions for most variables in both ***:Overall,these findings provide clinicians,trainers,and researchers with a 10-min single-session protocol to perform a reliable muscle strength and endurance evaluatio

关键词： Core muscles Fitness Isokinetic dynamometry Performance Spine Testing

The Universe, Origen and Destiny

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Journal of Modern Physics 2018年第9期9卷 1814-1826页

作者： juan l. lartigue UNAM México City México

In a previous paper [1] [2] [3], the author has proposed the following concepts: the Hubble field, the constant value of acceleration of the Universe expansion, a De Sitter-Hubble gravitational equation, and the possibility of an imaginary time, all of them mainly oriented to a hypothesis about the Universe destiny. This work mentions some theories about the origin of the Universe and suggests the existence of a limit for the physical Universe. Accordingly to a relevant author [4], there are two main ways in considering these themes: those methods based on physical theories and those founded in metaphysical concepts of philosophy and religion. After some comments on such theories, this paper agrees that, in the physical search, the Big Bang seems to be the most probable origin of the physical Universe, space and time. On the metaphysical approach, the creation ex nihilo seems to be the commonest hypothesis for such origin. Besides, it is assumed that the Creator would have set two driving and successive conditions: transcendence and ethics. Reference is made to the arrow of time and to the proper time, a physical concept aimed to define both frozen and imaginary times, which would correspond to a space without time, and another space with imaginary time. A diagram is proposed for the Euclidic space, including a world-line throughout the space-like.

关键词： Hubble Field

Contrasting initial events of localized corrosion on surfaces of 2219-T42 and 6061-T6 aluminum alloys exposed in Caribbean seawater

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Transactions of Nonferrous Metals Society of China 2019年第1期29卷 34-42页

作者： Gloria ACOSTA lucien VElEVA juan luis lóPEZ D.A.lóPEZ-SAURI Applied Physics Department Research Center for Advanced Studies (CINVESTAV) Unidad Mérida Tecnológico Nacional de México Instituto Tecnológico de Mérida Departamento de Química y Bioquímica

Aluminum alloy samples, 6061-T6 and 2219-T42, were exposed to Caribbean seawater for 90 d. The fluctuations of open circuit potential, considered as electrochemical noise (EN), were used to characterize and compare initial pitting events, which appeared on their surfaces. EN analysis was carried out using the power spectral density (PSD) vs frequency. The decrease of the β exponent in PSD graphs indicated a release of spontaneous energy with the progress of pit formation in seawater. The fluctuations were associated with the breakdown and formation of new corrosion layers. The values of β exponent in PSD graphs suggest that corrosion process of AA2219-T42 alloy occurs as a persistent non-stationary process, the dynamics of which is controlled by fractional Brownian motion (fBm), while on AA6061-T6 alloy the corrosion process was dominated by stationary and weakly persistent features, with the contribution of fractional Gaussian noise (fGn). After the exposure in seawater, SEM-EDX analysis revealed insoluble intermetallic particles on the alloys, rich in Cu or Fe and irregularly distributed. The preferential dissolution of Mg and Al occurs from the S-phase (Al2CuMg) of AA2219-T42 alloy.

关键词： aluminum alloy corrosion electrochemical noise intermetallic particles seawater

Conjugation of Chitooligosaccharide-5-fluorouracil with Bovine Serum Albumin

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Chinese Chemical letters 2006年第11期17卷 1495-1498页

作者： Rong Min WANG Jing Feng SONG Yu Feng HE juan juan MAO Yan lI Key laboratory of Polymer Materials of Gansu Province Institute of Polymer Northwest Normal University Lanzhou 730070

The interaction between chitooligosaccharide-5-fluorouracil （COS-5FU） and bovine serum albumin （BSA） was studied by fluorescence spectroscopy. It was found that an energy transfer between COS-5FU and BSA had been occurred. The binding constants were calculated, k298K=1.175×10^4 l·mol^-1. Based on the mechanism of energy transfer of dipole-dipole interaction between the donor and acceptor, the distance between BSA and COS-SFU was determined.

关键词： Chitooligosaccharide-5-fluorouracil BSA fluorescence spectroscopy.

Solvothermal Syntheses and Characterization of Three One-dimension Cadmium Selenidoarsenates [Ni(1,2-dap)3][As2CdSe4],[Zn(1,2-dap)3][As2CdSe4] and [Ni(en)3][As2CdSe4]

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Chemical Research in Chinese Universities 2019年第4期35卷 560-563页

作者： DU Cuixia CHEN juan BAIYIN Menghe College of Chemistry & Environmental Science Inner Mongolia Normal UniversityHohhot 010022P. R.China

Three new cadmium selenidoarsenates,[Ni(1,2-dap)3][As2CdSe4](1)(1,2-dap=l,2-diaminopropane),[Zn( 1,2-dap)3][As2CdSe4](2) and [Ni(en)3][As2CdSe4](3)(en=ethylenediamine), were synthesized under solvothermal conditions. And they are isostnictural and monoclinic crystalls. As seen from their structures, they exhibited one-dimensional(1D) chains composed of [As2CdSe4]^2- anions and [TM(amine)3]^2+(TM=Ni,Zn;amine=1,2-dap, en) cations. Their absorption edges are 2.32, 1.84 and 2.38 eV and they show the properties of the semiconductor. These compounds were also characterized by means of single-crystal X-ray ditlraction(XRD), powder X-ray diflraction (PXRD), solid-state optical absorption spectrometry, and so on.

关键词： Solvothennal synthesis Selenidoarsenate Cadmium

Epidemiological data on acupuncture and physical and rehabilitation medicine in the European Union

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Journal of Traditional Chinese Medicine 2015年第4期35卷 478-482页

作者： María Victoria González-lópez-Arza Patrick Sautreuil Enrique Varela-Donoso juan Rodríguez-Mansilla Elisa Garrido-Ardila Department of Medical-Surgical Therapy Medicine FacultyExtremadura University Neuro-orthopedic Rehabilitation Service Rothschild Hospital Department of Physical Medicine and Rehabilitation Medicine FacultyComplutense University

OBJETIVE: To know the prevalence of acupuncturists within physical and rehabilitation medicine specialists in Europe and their characteristics,as well as to analyze the pathologies treated and therapeutic techniques ***: This is a cross-sectional descriptive study based on a structured and closed questionnaire. The study was carried out from October 2011 to May ***: A total of 115 specialists from 19 countries completed the questionnaire. The mean characteristics of the physical and rehabilitation medicine(PRM) specialists who are also acupuncturists in Europe were: women(62.6 %); mean age of47.91 years old; 4.20 years of physical and rehabilitation medicine school and 2.00 years of acupuncture training; 15.03 years of mean time of clinical practice as physical and rehabilitation medicine specialists and 10.42 years of experience as acupuncturists; 35.65 % had a doctorate(Ph D) degree,obtained at a mean age of 33.55 years old; working in a public hospital(80%); treating mainly neurological conditions(48.1%) and using mainly techniques such as kinesiotherapy(11.81%),orthosis(10.40%) and electrotherapy(9.92%). Acupuncture was applied by 32.2% of the participants mainly in musculoskeletal conditions(27.38%). A mean number of more than 20 patients a day were treated by47.04% of the specialists,being 41.8% of the patients(adults and children). Significant differences were found between the variables,acupuncture and gender(Pearson's correlation Index = 0.007).However,no differences were observed in relation to acupuncture and age,doctorate degree,years of clinical practice and workplace(all with P values >0.05).CONClUSION: In the European area,physical and rehabilitation medicine specialists who are also acupuncturists are mainly female,middle-aged,with15 years of professional experience,Ph D holders,working in public hospitals,treating mainly neurological conditions with kinesiotherapy and acupuncture,and treating over 20 patients a day(adults and child

关键词： Epidemiology Physical and rehabilita-tion medicine Acupuncture Europe Professional practice

CP-Violation from Spin-1 Resonances in a left-Right Dynamical Higgs Context

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Communications in Theoretical Physics 2016年第7期65卷 93-103页

作者：阮坤明舒菁 juan Yepes State Key laboratory of Theoretical Physics and Kavli Institute for Theoretical Physics China (KITPC) Institute of Theoretical Physics Chinese Academy of Sciences State Key laboratory of Theoretical Physics and Kavli Institute for Theoretical Physics China (KITPC) Institute ofTheoretical Physics Chinese Academy of Sciences

New physics field content in the nature, more specifically, from spin-1 resonances sourced by the extension of the SM local gauge symmetry to the larger local group SU(2)_lSU(2)_R U(1)_(B-l), may induce CP-violation signalling NP effects from higher energy regimes. In this work we completely list and study all the CP-violating operators up to the p^4-order in the lagrangian expansion, for a non-linear left-right electroweak chiral context and coupled to a light dynamical Higgs. Heavy right handed fields can be integrated out from the physical spectrum, inducing thus a physical impact in the effective gauge couplings, fermionic electric dipole moment, and CP-violation in the decay h→ ZZ*→4 l that are briefly analysed. The final relevant set of effective operators have also been identified at low energies.

关键词： CP-violation spin-1 resonances dynamical Higgs

Glide symmetry protected higher-order topological insulators from semimetals with butterfly-like nodal lines

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npj Computational Materials 2021年第1期7卷 1871-1876页

作者： Xiaoting Zhou Chuang-Han Hsu Cheng-Yi Huang Mikel Iraola juan l.Mañes Maia G.Vergniory Hsin lin Nicholas Kioussis Department of Physics and Astronomy California State UniversityNorthridgeCA 91330USA Department of Electrical and Computer Engineering Faculty of EngineeringNational University of SingaporeSingapore 117583Singapore Institute of Physics Academia SinicaTaipei 115201Taiwan Donostia International Physics Center Donostia-San Sebastian 20018Spain Department of Condensed Matter Physics University of the Basque Country UPV/EHUApartado 644Bilbao 48080Spain IKERBASQUE Basque Foundation for ScienceMaria Diaz de Haro 3Bilbao 48013Spain

Most topological insulators(TIs)discovered today in spinful systems can be transformed from topological semimetals(TSMs)with vanishing bulk gap via introducing the spin-orbit coupling(SOC),which manifests the intrinsic links between the gapped topological insulator phases and the gapless ***,we have discovered a family of TSMs in time-reversal invariant spinless systems,which host butterfly-like nodal-lines(Nls)consisting of a pair of identical concentric intersecting coplanar ellipses(CICE).In this Communication,we unveil the intrinsic link between this exotic class of nodal-line semimetals(NlSMs)and a Z_(4)=2 topological crystalline insulator(TCI),by including substantial *** demonstrate that in three space groups(i.e.,Pbam(No.55),P4/mbm(No.127),and P4_(2)/mbc(No.135)),the TCI supports a fourfold Dirac fermion on the(001)surface protected by two glide symmetries,which originates from the intertwined drumhead surface states of the CICE *** higher order topology is further demonstrated by the emergence of one-dimensional helical hinge states,indicating the discovery of a higher order topological insulator protected by a glide symmetry.

关键词： topological protected insulator

A Co(Ⅱ) Coordination Polymer: Crystal Structure and Treatment Effect on Anxiety and Insomnia by Reducing Sympathetic Excitability

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Chinese Journal of Structural Chemistry 2020年第8期39卷 1509-1514,1361页

作者： lI Dong-Mei GUO juan School of Psychology Northeast Normal UniversityChangchun 130024China

A new coordination polymer,[Co2(l)2(H2O)2]n·H2O(1,H2l?=?5-(1H-1,2,4-triazol-1-yl)-1,3-benzenedicarboxylic acid),was constructed by hydrothermal condition reaction of Co(NO3)2·6H2O and H2l at the pH value of *** as-prepared complex 1 was characterized by elemental analysis,IR and single-crystal X-ray ***,a green hand grinding technique has been implemented to reduce the particle size of complex 1 to generate nanoscale 1(denoted as nano 1 hereafter)with spherical ***,the treatment of the compound on anxiety and insomnia was ***,the ElISA was used to detect the content of serotonin,gamma-aminobutyric acid in the ***,the Rat sleep phase detection was determined by pentobarbital synergistic sleep experiment.

关键词： Co(Ⅱ)-complex 3D framework nanoparticles anxiety and insomnia