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Sarcopenia in geriatric patients from the plateau region of Qinghai- Tibet: A cross-sectional study

World Journal of Clinical Cases 2021年第19期9卷 5092-5101页

作者： Shi-Qin Pan yue-mei li Xiao-Fang li Rui Xiong Department of Nursing Qinghai Provincial People’s HospitalXining 810007Qinghai ProvinceChina

BACKGROUND Sarcopenia is an age-related decline in skeletal muscle mass,which depends on an assessment of muscle strength and muscle *** has been reported that the prevalence of sarcopenia in non-hospitalized elderly people was 9.0%-18.5%in the lowland ***,epidemiological investigations of sarcopenia in plateau regions are *** city of Xining in Qinghai Province(altitude 2260 m)is the sole point of access to the Qinghai-Tibet *** hypothesized that the diverse ethnicities or dietary habits of the people living in the plateau may influence the prevalence of *** To investigate the prevalence and risk factors of sarcopenia in geriatric patients from the Qinghai-Tibet plateau *** From October to December 2018,150 hospitalized geriatric patients(72.4±5.60 years)from Xining City(altitude 2260 m)in Qinghai Province were *** data included demographics,history of fall,nutritional status,self-care ability,depression,handgrip,muscle mass,and 6-m gait *** was diagnosed based on the 2014 criteria of the Asian Working Group for *** The overall rate of sarcopenia was 20%(8.7 and 11.3%in men and women,respectively).Binary logistic regression analysis indicated that widowhood and a history of falling were associated with sarcopenia,while higher body mass index and beef and mutton consumption were *** The prevalence of sarcopenia in hospitalized geriatric patients in the Qinghai-Tibet plateau region was higher than that in the plain region and in non-hospitalized geriatric people(reported elsewhere).Specific cultural features of the region,including ethnicity,brewed tea and ghee consumption,were not significantly associated with *** body mass index and consumption of beef and mutton were protective,while patients who were widowed or with a history of falling were at increased risk.

关键词： Geriatric patient Prevalence Plateau Risk factors Sarcopenia

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Comparison of the prevalence of sarcopenia in geriatric patients in Xining based on three different diagnostic criteria

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World Journal of Clinical Cases 2022年第33期10卷 12200-12207页

作者： Shi-Qin Pan Xiao-Fang li Ming-Qin Luo yue-mei li Department of Nuring Qinghai Provincial People’s HospitalXining 810000Qinghai ProvinceChina

BACKGROUND Sarcopenia is an age-related decline in skeletal muscle mass,which depends on an assessment of muscle strength and muscle *** diagnostic definition of sarcopenia varies by *** To determine the optimal diagnostic criteria for sarcopenia in a plateau *** off values for the components of diagnostic algorithms for sarcopenia in plateau populations should consider *** One hundred and fifty subjects aged>60 years attending a tertiary comprehensive hospital in the city of Xining(elevation:2260 m)between October and December 2018 were *** strength,muscle mass,and physical performance were *** was diagnosed according to the Asian Working Group for Sarcopenia(AWGS)2019 criteria,Beijing criteria,and Lasha *** Across diagnostic criteria,there were significant differences in the prevalence of sarcopenia in the overall population and stratified by *** prevalence of sarcopenia measured by the AWGS 2019 or Lasha criteria was significantly higher in female compared to male *** males,the prevalence of sarcopenia measured by the Beijing criteria was significantly higher in subjects who identified as Han compared to *** females,there were no significant differences in the prevalence of sarcopenia by ethnicity according to any *** The Lasha criteria provided a lower prevalence of sarcopenia(males,8.7%;females,22.41%;overall,14%)and were able to differentiate between males and *** Lasha criteria are likely most appropriate for detection of sarcopenia in this plateau *** recommend the Lasha criteria for detection of sarcopenia in Xining.

关键词： Ethnic Diagnostic criteria Sarcopenia Prevalence Plateau

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Health care worker occupational experiences during the COVID-19 outbreak:A cross-sectional study

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World Journal of Clinical Cases 2022年第16期10卷 5275-5286页

作者： Xiao-Fang li Xuan-lin Zhou Sheng-Xiu Zhao yue-mei li Shi-Qin Pan Department of Nursing Qinghai Provincial People’s HospitalXining 810007Qinghai ProvinceChina Department of Neurosurgery Qinghai Provincial People’s HospitalXining 810007Qinghai ProvinceChina

BACKGROUND Health care workers treating coronavirus disease 2019(COVID-19)patients experience burnout and stress due to overwork and poor working *** To investigate the work experiences of frontline health care workers in Wuhan city and Qinghai province,China,during the COVID-19 *** In this cross-sectional descriptive study,a self-reported questionnaire was designed to evaluate work experiences of medical staff throughout the course of the COVID-19 pandemic.A total of 178 health care workers responded to the questionnaire between February 19 and 29,*** questionnaire dimensional score confirmed dimensional *** Of all dimensions evaluated by this questionnaire,the occupational value dimension had the highest mean score of 2.61(0.59),followed by the support/security dimension score of 2.30(0.74).Occupational protection scored lowest at 1.44(0.75),followed by work environment at 1.97(0.81).The social relationships dimension had an intermediate score of 2.06(0.80).Significant differences in working conditions were observed across hospital departments,with the fever ward scoring *** scores also differed significantly across workplaces;the fever outpatient department scored lowest(Plikely due to the fact that work in the fever outpatient department,where many patients present to hospital,necessitates constant contact with a large number of individuals with insufficient provision of resources(such as protective equipment and social support).Medical workers in the fever outpatient department were burdened with a fear of COVID-19 infection and a lower sense of professional value as compared to workers in other hospital *** staff in Wuhan worked longer hours(P<0.01)as compared to *** mean support/security dimension score was higher for tertiary hospital as compared to secondary hospital medical staff as well as for Wuhan area as compared to Qinghai region staff(P<0.01).S

关键词： Novel coronavirus COVID-19 Health care worker Occupational exposure Personal protective equipment

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Detecting bulk and edge exceptional points in non-Hermitian systems through generalized Petermann factors

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Frontiers of physics 2024年第2期19卷 169-177页

作者： yue-Yu Zou Yao Zhou li-mei Chen Peng Ye School of Physics State Key Laboratory of Optoelectronic Materials and Technologiesand Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSun Yat-sen UniversityGuangzhou 510275China

Non-orthogonality in non-Hermitian quantum systems gives rise to tremendous exotic quantum phenomena,which can be fundamentally traced back to *** this paper,we introduce an interesting quantity(denoted asη)as a new variant of the Petermann factor to directly and efficiently measure non-unitarity and the associated non-Hermitian *** tuning the model parameters of underlying non-Hermitian systems,we find that the discontinuity of bothηand its first-order derivative(denoted as■η)pronouncedly captures rich physics that is fundamentally caused by *** concretely,in the 1D non-Hermitian topological systems,two mutually orthogonal edge states that are respectively localized on two boundaries become non-orthogonal in the vicinity of discontinuity ofηas a function of the model parameter,which is dubbed"edge state transition".Through theoretical analysis,we identify that the appearance of edge state transition indicates the existence of exceptional points(EPs)in topological edge *** the discontinuity of■η,we investigate a two-level non-Hermitian model and establish a connection between the points of discontinuity of■ηand EPs of bulk *** studying this connection in more general lattice models,we find that some models have discontinuity of■η,implying the existence of EPs in bulk states.

关键词： non-Hermitian Su−Schrieffer−Heeger(SSH)model exceptional point

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Mechanical Properties and Electronic Structures of M(M=Ti,V,Cr,Mn and Fe)Dopedβ-Si_(3)N_(4) from First-Principle

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Journal of Wuhan University of Technology(Materials Science) 2024年第3期39卷 639-644页

作者：龙敏黄福祥 XU liangyu li Xuemei YANG Zhou LENG yue mei Shini School of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China

The structures,mechanical properties and electronic structures of M metals(M=Ti,V,Cr,Mn and Fe)dopedβ-Si_(3)N_(4) were investigated by First-principles calculations within *** calculated lattice parameters ofβ-Si_(3)N_(4) were consistent with previous *** cohesive energy and formation enthalpy show that initialβ-Si_(3)N_(4) has the highest structural *** calculated elastic constant and the Voigt-Reuss-Hill approximation indicate that elastic moduli ofβ-Si_(3)N_(4) are slightly reduced by M *** on Poisson’s and Pugh’s ratio,β-Si_(3)N_(4) is a ductile material and the toughness ofβ-Si_(3)N_(4) increases with M doping,and Fe doping exhibited the best *** results of density of states,charge distributions and overlapping populations indicate thatβ-Si_(3)N_(4) has the strong covalent and ionic bond strength between N and Si.

关键词： first-principles β-Si_(3)N_(4) mechanical properties electronic structure

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Cone-beam computed tomography noise reduction method based on U-Net with convolutional block attention module in proton therapy

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Nuclear Science and Techniques 2024年第7期35卷 89-100页

作者： Xing-yue Ruan Xiu-Fang li Meng-Ya Guo mei Chen Ming Lv Rui li Zhi-ling Chen Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai201800China University of Chinese Academy of Sciences Beijing100049China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai201210China Department of Radiation Oncology Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai200025China Shanghai Key Laboratory of Proton therapy Shanghai201801China

Cone-beam computed tomography(CBCT) is mostly used for position verification during the treatment process. However,severe image artifacts in CBCT hinder its direct use in dose calculation and adaptive radiation therapy re-planning for proton therapy. In this study, an improved U-Net neural network named CBAM-U-Net was proposed for CBCT noise reduction in proton therapy, which is a CBCT denoised U-Net network with convolutional block attention modules. The datasets contained 20 groups of head and neck images. The CT images were registered to CBCT images as ground truth. The original CBCT denoised U-Net network, sCTU-Net, was trained for model performance comparison. The synthetic CT(SCT) images generated by CBAM-U-Net and the original sCTU-Net are called CBAM-SCT and U-Net-SCT images, respectively. The HU accuracies of the CT, CBCT, and SCT images were compared using four metrics: mean absolute error(MAE), root mean square error(RMSE), peak signal-to-noise ratio(PSNR), and structure similarity index measure(SSIM). The mean values of the MAE, RMSE, PSNR, and SSIM of CBAM-SCT images were 23.80 HU, 64.63 HU, 52.27 dB, and 0.9919, respectively,which were superior to those of the U-Net-SCT images. To evaluate dosimetric accuracy, the range accuracy was compared for a single-energy proton beam. The γ-index pass rates of a 4 cm × 4 cm scanned field and simple plan were calculated to compare the effects of the noise reduction capabilities of the original U-Net and CBAM-U-Net on the dose calculation results. CBAM-U-Net reduced noise more effectively than sCTU-Net, particularly in high-density tissues. We proposed a CBAM-U-Net model for CBCT noise reduction in proton therapy. Owing to the excellent noise reduction capabilities of CBAM-U-Net, the proposed model provided relatively explicit information regarding patient tissues. Moreover, it maybe be used in dose calculation and adaptive treatment planning in the future.

关键词： Proton therapy Cone-beam CT CBAM-U-Net γ-index

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Toward Improved Accuracy in Quasi-Static Elastography Using Deep Learning

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Computer Modeling in Engineering & Sciences 2024年第4期139卷 911-935页

作者： yue mei Jianwei Deng Dongmei Zhao Changjiang Xiao Tianhang Wang li Dong Xuefeng Zhu Department of Engineering Mechanics State Key Laboratory of Structural Analysis for Industrial EquipmentDalian University of TechnologyDalian116023China International Research Center for Computational Mechanics Dalian University of TechnologyDalian116023China DUT-BSU Joint Institute Dalian University of TechnologyDalian116023China Department of Automotive Engineering Tongji UniversityShanghai201804China *** SeattleWA98109USA School of Automotive Engineering Dalian University of TechnologyDalian116023China

Elastography is a non-invasive medical imaging technique to map the spatial variation of elastic properties of soft *** quality of reconstruction results in elastography is highly sensitive to the noise induced by imaging measurements and *** address this issue,we propose a deep learning(DL)model based on conditional Generative Adversarial Networks(cGANs)to improve the quality of nonhomogeneous shear modulus *** train this model,we generated a synthetic displacement field with finite element simulation under known nonhomogeneous shear modulus *** the simulated and experimental displacement fields are used to validate the proposed *** reconstructed results demonstrate that the DL model with synthetic training data is able to improve the quality of the reconstruction compared with the well-established optimization ***,we emphasize that our DL model is only trained on synthetic *** might provide a way to alleviate the challenge of obtaining clinical or experimental data in ***,this work addresses several fatal issues in applying the DL technique into elastography,and the proposed method has shown great potential in improving the accuracy of the disease diagnosis in clinical medicine.

关键词： Nonhomogeneous elastic property distribution reconstruction deep learning finite element method inverse problem elastography conditional generative adversarial network

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Total Sensitivity Index Calculation of Tool Requirement Model via Error Propagation Equation

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Journal of Electronic Science and Technology of China 2007年第3期5卷 278-282页

作者： Cun yue li-mei Xu with School of Mechatronic Engineering University of Electronic Science and Technology of China Chengdu 610054 China

A new and convenient method is presented to calculate the total sensitivity indices defined by variance-based sensitivity analysis. By decomposing the output variance using error propagation equations, this method can transform the ＂double-loop＂ sampling procedure into ＂single-loop＂ one and obviously reduce the computation cost of analysis. In contrast with Sobors and Fourier amplitude sensitivity test （FAST） method, which is limited in non-correlated variables, the new approach is suitable for correlated input variables. An application in semiconductor assembling and test manufacturing （ATM） factory indicates that this approach has a good performance in additive model and simple non-additive model.

关键词： Error propagation total sensitivity index variance-based sensitivity analysis.

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Counterion-Mediated Hydrogen Bonding Making Strong Polyelectrolytes pH-Responsive:Current Understanding and Perspectives

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Chinese Journal of Polymer Science 2024年第9期42卷 1270-1277,I0005页

作者： yue Huang Guang-Tao mei Zan Hua Guang-Ming liu Hefei National Research Center for Physical Sciences at the Microscale Department of Chemical PhysicsKey Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesUniversity of Science and Technology of ChinaHefei230026China The Key Laboratory of Functional Molecular Solids Ministry of Educationand Department of Materials ChemistrySchool of Chemistry and Materials ScienceAnhui Normal UniversityWuhu214002China

The counterion-mediated hydrogen bonding(CMHB)is related to the hydrogen bonding between bound counterions and polyelectrolyte chains in polyelectrolyte systems,where the counterions can both electrostatically bind to the charged groups of polyelectrolyte chains and act as hydrogen bond donors or acceptors to form hydrogen bonds with the hydrogen bond sites associated with polyelectrolyte chains simultaneously.A large number of literatures illustrate that strong polyelectrolytes(SPs)are insensitive to pH,which severely limmits the applications of SPs as smart ***,our studies have demonstrated that the CMHB makes SPs *** perspective discusses the mechanism of pH responsiveness of SPs and the pH-tunable properties of SPs,based on the pH-controlled CMHB *** future research directions on the pH responsiveness of SPs are also discussed *** is anticipated that the study of the pH responsiveness of SPs not only will provide a new understanding of the fundamental properties of SPs,but also will greatly expand the applications of SPs in the field of smart materials.

关键词： Counterion binding Hydrogen bond Polyelectrolyte brush Polyelectrolyte complexation

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Micro segment analysis of supercritical methane thermal-hydraulic performance and pseudo-boiling in a PCHE straight channel

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Petroleum Science 2024年第2期21卷 1275-1289页

作者： Qian li Zi-Jie lin liu Yang yue Wang yue li Wei-Hua Cai Laboratory of Thermo-Fluid Science and Nuclear Engineering Northeast Electric Power UniversityJilin132000JilinChina School of Energy and Power Engineering Northeast Electric Power UniversityJilin132000JilinChina

The printed circuit heat exchanger(PCHE) is receiving wide attention as a new kind of compact heat exchanger and is considered as a promising vaporizer in the LNG process. In this paper, a PCHE straight channel in the length of 500 mm is established, with a semicircular cross section in a diameter of 1.2 *** simulation is employed to investigate the flow and heat transfer performance of supercritical methane in the channel. The pseudo-boiling theory is adopted and the liquid-like, two-phase-like, and vapor-like regimes are divided for supercritical methane to analyze the heat transfer and flow *** results are presented in micro segment to show the local convective heat transfer coefficient and pressure drop. It shows that the convective heat transfer coefficient in segments along the channel has a significant peak feature near the pseudo-critical point and a heat transfer deterioration when the average fluid temperature in the segment is higher than the pseudo-critical point. The reason is explained with the generation of vapor-like film near the channel wall that the peak feature related to a nucleateboiling-like state and heat transfer deterioration related to a film-boiling-like state. The effects of parameters, including mass flow rate, pressure, and wall heat flux on flow and heat transfer were *** calculating of the averaged heat transfer coefficient of the whole channel, the traditional method shows significant deviation and the micro segment weighted average method is adopted. The pressure drop can mainly be affected by the mass flux and pressure and little affected by the wall heat flux. The peak of the convective heat transfer coefficient can only form at high mass flux, low wall heat flux, and near critical pressure, in which condition the nucleate-boiling-like state is easier to appear. Moreover,heat transfer deterioration will always appear, since the supercritical flow will finally develop into a filmboiling-like state. So hea

关键词： Printed circuit heat exchanger Vaporization Supercritical methane Pseudo-boiling Micro segment analysis

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