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Residual force enhancement in human skeletal muscles:A systematic review and meta-analysis

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Journal of Sport and Health Science 2022年第1期11卷 94-103页

作者： Daiani de Campos Lucas b.R.Orssatto Gabriel S.Trajano Walter Herzog Heiliane de brito Fontana biomechanics Laboratory Federal University of Santa CatarinaFlorianopolis 88040-001Brazil Faculty of Health School of Exercise and Nutrition SciencesQueensland University of TechnologyBrisbane QLD 4030Australia Human Performance Laboratory Faculty of KinesiologyUniversity of CalgaryAB T2N 1N4Canada School of biological Sciences Federal University of Santa CatarinaFlorianopolis 88040-900Brazil

Objective:We reviewed and appraised the existing evidence of in vivo manifestations of residual force enhancement in human skeletal muscles and assessed,through a meta-analysis,the effect of an immediate history of eccentric contraction on the subsequent torque capacity of voluntary and electrically evoked muscle ***:Our search was conducted from database inception to May *** information was extracted from,and quality was assessed for,45 ***-analyses and metaregressions were used to analyze residual torque enhancement and its dependence on the angular amplitude of the preceding eccentric ***:Procedures varied across studies with regards to muscle group tested,angular stretch amplitude,randomization of contractions,time window analyzed,and verbal *** capacity in isometric(constant muscle tendon unit length and joint angle)contractions preceded by an eccentric contraction was typically greater compared to purely isometric contractions,and this effect was greater for electrically evoked muscle contractions than voluntary *** torque enhancement differed across muscle groups for the voluntary contractions,with a significant enhancement in torque observed for the adductor pollicis,ankle dorsiflexors,ankle plantar flexors,and knee extensors,but not for the elbow and knee ***-regressions revealed that the angular amplitude of the eccentric contraction(normalized to the respective joints full range of motion)was not associated with the residual torque enhancement ***:There is evidence of residual torque enhancement for most,but not all,muscle groups,and residual torque enhancement is greater for electrically evoked than for voluntary *** to our hypothesis,and contrary to generally accepted findings on isolated muscle preparations,residual torque enhancement in voluntary and electrically evoked contractions does not seem to depend on the angular ampli

关键词： Cross-bridge theory Eccentric contraction Force-length relationship Isometric force Muscle properties

Physics-informed neural networks for diffraction tomography

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Advanced Photonics 2022年第6期4卷 44-55页

作者： Amirhossein Saba Carlo Gigli Ahmed b.Ayoub Demetri Psaltis École Polytechnique Fédérale de Lausanne Optics LaboratoryLausanneSwitzerland

We propose a physics-informed neural network(PINN)as the forward model for tomographic reconstructions of biological *** demonstrate that by training this network with the Helmholtz equation as a physical loss,we can predict the scattered field *** will be shown that a pretrained network can be fine-tuned for different samples and used for solving the scattering problem much faster than other numerical *** evaluate our methodology with numerical and experimental *** PINNs can be generalized for any forward and inverse scattering problem.

关键词： deep learning physics-informed neural networks scattering three-dimensional imaging optical diffraction tomography

Macroeconomics Andrew b. Abel, ben S. bernanke 4th ed.

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Constraints on Neutrino Masses from baryon Acoustic Oscillation Measurements

丛书名： The Addison-Wesley series in economics

2001年

作者： Andrew b. Abel ben S. bernanke

Accompanied by: Macroeconomics, fourth edition update 2002-2003 (v, 25 p. : ill. ; 26 cm.).

ISBN: (数字)0201441330

ISBN: (纸本)0201441330

Accompanied by: Macroeconomics, fourth edition update 2002-2003 (v, 25 p. : ill. ; 26 cm.).

关键词： Macroeconomics.

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International Journal of Astronomy and Astrophysics 2018年第1期8卷 1-5页

作者： b. Hoeneisen Universidad San Francisco de Quito Quito Ecuador

From 21 independent baryon Acoustic Oscillation (bAO) measurements we obtain the following sum of masses of active Dirac or Majorana neutrinos: , where and . This result may be combined with independent measurements t... 详细信息

关键词： Neutrino Mass baryon Accoustic Oscillations Cosmology

Mass differences and neutron pairing in Ca, Sn and Pb isotopes

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Chinese Physics C 2017年第9期41卷 83-89页

作者： b. S. Ishkhanov S. V. Sidorov T. Yu. Tretyakova E. V. Vladimirova Faculty of Physics M.V. Lomonosov Moscow State University Moscow 119991 Russia Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University Moscow 119991 Russia

Abstract： Various estimates of the even-odd effect of the mass shell of atomic nuclei are considered. based on the experimental mass values of the Ca, Sn, and Pb isotopes, the dependence of the energy gap on the neutron number is traced and the relationship of this characteristic to the properties of external neutron subshells is shown. In nuclei with closed proton shells, effects directly related to neutron pairing and effects of nucleon shells are discussed.

关键词： nucleon interaction models of atomic nuclei nucleon pairing in atomic nuclei

Effects of PVA and PEG on pH Dependent Shear Yield Stress of Concentrated Alumina Suspensions

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Chinese Journal of Chemical Engineering 2002年第1期10卷 132-133页

作者：曾人杰 b.RAND InstituteofChemistryandChemicalEngineering UniversityofXiamenXiamen361005China

The pH dependence of the extrapolated shear yield stress for Alcoa A16 a-Al2O3 suspensions at the powder volume fraction of 0.27 with and without addition of both polyvinyl alcohol (PVA) and polyethylene glycol (PEG) each at fixed 0.18% of the powder mass was studied. With the polymer added, the full deflocculation of the suspension shifts from about pH=4 to around pH=1.5, at which the minimum value of shear yield stress is higher than that at pH=4. The addition of both PVA and PEG was found to prevent the filter cake from cracking.

关键词： polyvinyl alcohol polyethylene glycol shearing yield stress pH value alumina suspension

Effect of galvanic contact on the flotability of galena in the presence and absence of a collector

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International Journal of Mining Science and Technology 2012年第5期22卷 629-632页

作者： M.b.Eslami Andargoli S.Jannesar Malakooti F.Doulati Ardejani H.Abdollahi Mining Engineering Department Savadkooh BranchIslamic Azad UniversitySavadkooh 447151333Iran Mineral Processing Engineering Department Islamic Azad UniversityLangaroud Branch 447151333Iran Young Researchers Club Islamic Azad UniversityLangaroud Branch 447151333Iran School of Mining College of EngineeringUniversity of TehranTehran ***Iran

In this paper,the effect of various electrochemical environments in the galena flotation is *** electrochemical environments consisted of a ball mill for grinding of galena ore and a Denver flotation cell for flotation of galena in the laboratory *** order to achieve the maximum recovery with sodium hyposulfite,the concentrations of 0.06 and 0.12 M of air and nitrogen gases have been used to control the pulp potential in the Denver flotation *** galena sample was from the ''Era mine'' which is located in the Kiyasar area,north of *** mine contains:Galena(PbS) at least 22%,Fluorite(CaF 2) 73.37%,Quartz(SiO 2) 2.54% and other minerals such as Cerussite(PbCO 3) and Kaolinite(Al 2 Si 2 O 5(OH) 4).Flotation of Galena was conducted in a 0.12 M of sodium hyposulfite *** was found that the amount of recovery by this process was 85% and 63% in the presence and absence of potassium amyl xanthate(KAX) and at an estimated potential of 280 to 350 mV respectively while the recovery was 70% and 52% at an approximate potential of 175 to 210 mV in water in the presence and absence of collector(KAX).

关键词： Flotation Collector Galena Electrochemical Galvanic interactions

Holocene lake deposits of bosten Lake,southern Xinjiang,China

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Chinese Science bulletin 2003年第14期48卷 1429-1432页

作者： b.Wuennemann CHENFahu F.Riedel ZHANGChengiun S.Mischke CHENGuangjie D.Demske MINGJin InterdisciplinaryCentreEcosystemDynamicsinCentralAsia FreieUniversitaetBerlinBerlin12249Germany DesertandDesertificationLab. ColdmadAridRegionsEnviron-mentalandEngineeringResearchInstituteChineseAcademyofSci-encesLanzhou730000China CenterforAridEnvironmentandPaleoclimateResearch NationalLab.ofWesternChina'sEnvironmentSystemsLanzhouUniversityLan-zhou730000China

A 9.25-m-long sediment core from bosten Lake, Xinjiang, provides detailed information about changes in the water budget and biological acticity over the last 8400 calendar years. The chronology is constructed from six AMS radiocarbon dates on the terrestrial plant remains. based on analyses of TOC, CO3, detrital compounds and biogenic SiO2, lake level fluctuations and periods of remarkably-negative water budget appeared at 8.4—8.2 cal ka, 7.38—7.25 cal ka, 5.7—5.5 cal ka, 3.7—3.4 cal ka and 3.3—2.9 cal ka, respectively. As they are in-phase with low lake levels at Sumxi Co and bangong Co in western Tibet Plateau and with paleolakes in Inner Mongolia, a climate-induced change to somewhat drier and warmer conditions is inferred. A further drop in lake level after 1320 AD of about 200 yr duration may be attributed to a negative water balance prior to the main phase of the Little Ice Age. Deep and stable lake phases of 1500 yr and 1800 yr duration at 7.2—5.7 cal ka and 5.5—3.7 cal ka coincide with maximum moisture during the Holocene Megathermal in China. The long term trend towards aridity since about 4.3 cal ka can clearly be recognised. The reduced water budget of bosten Lake from 640—1200 AD may be attributed to local effects.

关键词：中国新疆南部波士顿湖全新世湖泊沉积物古气候湖平面气候变化

A note on R_2-and cR_2-manifolds

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Journal of Harbin Institute of Technology(New Series) 2002年第2期9卷 136-138页

作者： Mihail b bANARU Smolensk University of Humanities Smolensk 214014Russia

The necessary and sufficient conditions for an arbitrary almost Hermitian manifold to be an R 2 or a cR 2 manifold are established. Some examples of non Khlerian and non nearly Khlerian R 2 and cR 2 manifolds are ... 详细信息

关键词： almost Hermitian manifold R2-manifold cR2-manifold