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Performance of Forearm FMG and sEMG for Estimating Elbow, Forearm and Wrist Positions

Journal of Bionic Engineering 2017年第2期14卷 284-295页

作者： zhen Gang xiao Carlo Menon Menrva Research Group Schools of Mechatronic Systems Engineering and Engineering Science Simon Fraser University British Columbia V3T0A3 Canada

The ability to track upper extremity movement during activity of daily living has the potential to facilitate the recovery of individuals with neurological or physical injuries. Hence, the use of Surface Electromyography （sEMG） signals to predict upper extremity movement is an area of interest in the research community. A less established technique, Force Myography （FMG）, which uses force sensors to detect forearm muscle contraction patterns, is also able to detect some movements of the arm. This paper investigates the comparative performance of sEMG and FMG when predicting wrist, forearm and elbow positions using signals extracted from the forearm only. Support Vector Machine （SVM） and Linear Discriminant Analysis （LDA） classifiers were used to evaluate the prediction performance of both FMG and sEMG data. Ten healthy volunteers participated in this study. Under a cross validation across a repetition evaluation scheme, the SVM classifier obtained averaged accuracies of 84.3%, 82.4% and 71.0%, respectively, for predicting elbow, forearm and wrist positions using FMG; while sEMG yielded 75.4%, 83.4% and 92.4% accuracies for predicting the same respective positions. The accuracies obtained using SVM are slightly, but statistical significantly, higher than the ones obtained using LDA. However, the trends on the classification performances between FMG and sEMG are consistent. These results also indicate that the forearm FMG pattern is highly influenced by the change of elbow position, while the forearm sEMG is less subjected to the change. Overall, both forearm FMG and sEMG techniques provide abundant information that can be utilized for tracking the upper extremity movements.

关键词： Surface Electromyography (sEMG) Force Myography (FMG) classification limb movement activity monitoring,upper extremity

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The PQCD approach towards to next-to-leading order:A short review

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Frontiers of physics 2021年第2期16卷 175-193页

作者： Shan Cheng zhen-Jun xiao School of Physics and Electronics Hunan UniversityChangha 410082 Department of Physics and Institute of Theortical Physics Nangjing Normal UniversityNanjing 210023China

In this short review we elaborate the significance of resummation in kτ factorization theorem,and summarize the recent progresses in the calculations of the next-to-leading order contributions to B meson decays from the perturbative QCD(PQCD)*** also comment on the current sta-tus of the PQCD approach and highlight some key issues to develop it in the near future for more phenomenological applications.

关键词： flavor physics perturbative QCD,kτfactorization next-to-leading order

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Effects of Trajectory Wind Direction on Ion Concentration of PM_(10)

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Biomedical and Environmental Sciences 2006年第4期19卷 262-267页

作者： xiao-zhen LIU STEVE SMITH Department of Environmental Engineering College of Environment and Chemical Engineering Nanchang Institute of Aeronautic Technology 173 Shanghai Road Nanchang 330034 Jiangxi China Division of Life Sciences Kings College London Franklin-Wilkins Building 150 Stamford Street London SE1 9NN UK

Objective To study the characterization apportionment of main ion concentrations of PM10 under the influence of trajectory wind direction in London. Methods PM10 samples from 1 May 1995 to 30 October 1995 of Oxford Street of Central London were collected, the metals and anions of which were measured using atomic absorption spectrometry （AAS） and ion chromatography （IC）. Composite trajectories representative of the air mass arriving in London at the same period were calculated based on basic routine back trajectories from the British Atmospheric Data Centre （BADC）. Results Concentration apportionments of main ions were similar when the trajectory was plotted back at 6 h, 12 h, and 24 h, some were obviously different. Mg, Ba, Pb, and Cu had similar peak apportionments at the area 180°-320°, but Zn and Ni at the area of 90°-270°, NO3^- and SO4^2- at the area of 100°-220°. Cl^- concentration peak apportionment was at the area of 220°-300°, which showed that Cl^- mainly came from the North Sea. Conclusion Trajectory wind direction has important effect on ion concentration apportionment of PM10 in London. The ions have similar concentration peak apportionments or their correlation coefficients are statistically significant.

关键词： Ion concentration PM10 Trajectory wind direction

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K→πvv:New Contributions from Unit-Charged Scalars in Topcolor-Assisted Technicolor Models

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Chinese Physics Letters 1999年第10期16卷 712-714页

作者： xiao zhen-jun Department of Physics He’nan Normal UniversityXinxiang 453002 Department of Physics Peking UniversityBeijing 100871

We calculate the new contributions to the rare K-decays K^(+)→π^(+)vv and K_(L)→π^(0)vv from the unit-charged scalars appearing in the topcolor-assisted technicolor *** using the square-root ansatz for the mixing matrices D_(L)and D_(R),we find that:(a)the new contributions from top-pionsπ^(~±)and b-pions^(~H±)dominate over that from ordinary technipionsπ1 andπs;(b)for aR^(ts*)aR^(td)=-1/4,the enhancements to the ratios B(K^(+)→π^(+)vv)and B(K_(L)→π^(0)vv)from new scalars can be as large as a factor 7 and 11,respectively;(c)the theoretical predictions are still consistent with the data after including the new contributions.

关键词： ordinary contributions mixing

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Exact Calculations of Vertex ^-sγb and ,^-sZb in the Unitary Gauge

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Communications in Theoretical Physics 2007年第3X期48卷 502-508页

作者： WU Lu-Sen xiao zhen-Jun Department of Physics and Institute of Theoretical Physics Nanjing Normal University Nanjing 210097 China

In this paper, we present the exact calculations for the vertex ^-sγb and ^sZb in the unitary gauge. We find that （a） the divergent- and μ-dependent terms are left in the effective vertex function Г^γμ（p, k） for b → sγ transition even after we sum up the contributions from four related Feynman diagrams; （b） for an on-shell photon, such terms do not contribute et al.; （c） for off-shell photon, these terms will be canceled when the contributions from both vertex ^sγb and ^sZb are taken into account simultaneously, and therefore the finite and gauge-independent function Zo（xt） = Co（xt）＋ Do（xt）/4, which governs the semi-leptonic decay b → sl^- l^＋, is derived in the unitary gauge.

关键词： unitary gauge Feynman diagram vertex

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Exclusive Semileptonic Rare Decays B→K()(?)+(?)^- in a Top Quark Two-Higgs-Doublet Model

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Communications in Theoretical Physics 2008年第7期50卷 149-160页

作者： LV Lin-Xia xiao zhen-Jun Department of Physics Nanyang Teacher＇s College Nanyang 473061 China Department of Physics and Institute of Theoretical Physics Nanjing Normal University Nanjing 210097 China

Employing improved calculations of the decay form factors from light-cone sum rules, we evaluate the invariant mass spectrum, forward-backward asymmetry, and lepton polarizations of the exclusive processes B → K^（＊）e＋e- in the SM and T2HDM. From the recent measurements of their branching ratios, we find that these processes do provide additional bounds on the new parameters in the model considered here. After the inclusion of the new physics contributions, the large enhancement of FBA, which is unobservably small within the SM and of the lepton polarization at large tan β, may precisely test the SM or reveal new physics in forthcoming accurate experiments.

关键词： semileptonic decay two-Higgs-doublet model polarization forward-backward asymmetry

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A Facile Synthesis of Squamosamide Cyclic Analogs

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Chinese Chemical Letters 2003年第7期14卷 667-669页

作者： xiao zhen JIAO Ping XIE xiao Tian LIANG Institute of Materia Medica Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100050

A series of novel cyclic derivatives have been synthesized by utilizing a nickel powder mediated radical cyclization as the key step. The structures of the new compounds were confirmed by 1H-NMR and MS.

关键词： Squamosamide radical cyclization synthesis.

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Scheme for Preparation of Macroscopic Multi-component Entanglement in Cavity QED

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Communications in Theoretical Physics 2008年第2期49卷 473-476页

作者： JIA Lian-Jun YANG zhen-Biao ZHOU zhen-xiao Department of Physics Lanzhou University Lanzhou 730000 China Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China

We propose a scheme of generating multi-component entangled coherent states of cavity fields. In this scheme, the atoms pass through cavities one by one, simultaneously driven by a strong classical field in each cavity. Then the detection of the atomic states collapses the cavity fields onto multi-component entangled coherent states. It is shown that, with a judicious choice of the parameters of the classical field, we can conditionally produce macroscopic multi-dimensional maximal entanglement for the cavity modes.

关键词： resonant interaction strongly driven atom multi-component entanglement cavity QED

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Molecular Dynamics Simulations of Atomistic Hydration Structures of Poly(vinyl methyl ether)

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Chinese Journal of Polymer Science 2016年第11期34卷 1396-1410页

作者：吴荣亮 Xin-long Qiu xiao-zhen Yang College of Material Science and Engineering State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua University Shanghai 201620 China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Science and Engineering Joint Laboratory of Polymer Science and Materials Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

Molecular dynamics simulations have been performed on the aqueous solutions of poly（vinyl methyl ether）（PVME） at various concentrations. Both radial and spatial distribution functions are used to investigate the detailed hydration structures. The structures of water are found to get increasingly concentrated when polymers are introduced and the water motions are severely hindered by the polymer matrix. At low concentrations, larger populations of tt conformers in meso dyads than those at higher concentrationsare found and this phenomenon is believed to be due to the increasing in bonding of water molecule to two ether oxygens in meso dyad. At higher concentrations, the size and conformations of polymers are quite similar to those in bulk. A transition of hydrogen bond fractions between PVME and water at around the concentration of 0.3 is observed and this value is perfectly in agreement with the results of conformational analysis and Raman spectra. Second neighbor hydrogen bond statistics revealed the domination of complicated hydrogen bond networks at low concentrations, but single hydrogen bonds as well as isolated clusters composed of 2-4 water molecules are usual around each polymer repeat unit.

关键词： vinyl conformational chains bonding perfectly backbone hydration hydrophilic bonds hydrophobic

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The two-body hadronic decays of B_c meson in the perturbative QCD approach:a short review

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Chinese Science Bulletin 2014年第29期59卷 3748-3759页

作者： zhen-Jun xiao Xin Liu Department of Physics and Institute of Theoretical Physics Nanjing Normal University Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University School of Physics and Electronic Engineering Jiangsu Normal University

Along with the running of Large Hadron Collider(LHC)located at CERN in November 2009,a large number of data samples of Bc meson have been collected and some hadronic Bc decay modes have been measured by the LHC *** view of the special and important roles of Bc meson decays playing in the heavy flavor sector,we here give a short review on the status of two body hadronic decays Bc!M1M2at both experimental and theoretical *** the theoretical progresses,specifically,we will show lots of theoretical studies on two body hadronic Bcdecays involving pseudoscalar,vector,scalar,axial-vector,even tensor meson(s)in the final states by employing the perturbative QCD(pQCD)factorization *** will present a general analysis about the twobody hadronic decays of the heavy Bc meson and also provide some expectations for the future developments.

关键词：微扰QCD 强子衰变介子评论欧洲核子研究中心大型强子对撞机实验测量衰减模式

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