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Health behavior outcomes in stroke survivors prescribed wearables for atrial fibrillation detection stratified by age

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Journal of Geriatric Cardiology 2024年第3期21卷 323-330页

作者： Joanne Mathew Jordy Mehawej Ziyue Wang Taylor Orwig Eric Ding Andreas Filippaios Syed Naeem Edith Mensah Otabil Alex Hamel Kamran Noorishirazi IrinaRadu Jane Saczynski David D.McManus Khanh-Van Tran Division of Cardiovascular Medicine Department of MedicineUniversity of Massachusetts Chan Medical SchoolLake Avenue NorthWorcesterUSA Department of Internal Medicine Central Michigan UniversityMount PleasantUSA Department of Pharmacy and Health Systems Sciences School of PharmacyNortheastern UniversityBostonUSA Department of Population and Quantitative Health Sciences University of Massachusetts Chan Medical SchoolLake Avenue NorthWorcesterUSA

BACKGROUND Smartwatches have become readily accessible tools for detecting atrial fibrillation(AF).There remains limited data on how they affect psychosocial outcomes and engagement in older *** examine the health behavior outcomes of stroke survivors prescribed smartwatches for AF detection stratified by *** We analyzed data from the Pulsewatch study,a randomized controlled trial that enrolled patients(≥50 years)with a history of stroke or transient ischemic attack and CHA2DS2-VASc≥*** participants were equipped with a cardiac patch monitor and a smartwatch-app dyad,while control participants wore the cardiac patch monitor for up to 44 *** evaluated health behavior parameters using standardized tools,including the Consumer Health Activation Index,the Generalized Anxiety Disorder questionnaire,the 12-Item Short Form Health Survey,and wear time of participants categorized into three age groups:Group 1(ages 50-60),Group 2(ages 61-69),and Group 3(ages 70-87).We performed statistical analysis using a mixedeffects repeated measures linear regression model to examine differences amongst age *** Comparative analysis between Groups 1,2 and 3 revealed no significant differences in anxiety,patient activation,perception of physical health and wear *** use of smartwatch technology was associated with a decrease in perception of mental health for Group 2 compared to Group 1(β=-3.29,P=0.046).CONCLUSION Stroke survivors demonstrated a willingness to use smartwatches for AF ***,among these study participants,the majority did not experience negative health behavior outcomes or decreased engagement as age increased.

关键词： prescribed stratified wear

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Combined effect of subsurface dam and layered heterogeneity on groundwater flow and salinity distribution in stratified coastal aquifers

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海洋学报:英文版 2023年第8期42卷 49-60页

作者： Chao Gao Jun Kong Jun Wang Tong Zhou Yuncheng Wen Key Laboratory of Coastal Disaster and Protection of Ministry of Education Hohai UniversityNanjing 210000China Nanjing Hydraulic Research Institute Nanjing 210000China

In this paper,for the first time,we investigated the combined effect of subsurface dams and a typical stratified aquifer(two high-permeability layers with a low-permeability layer between them)on groundwater flow and salinity distribution in a tidally influenced coastal unconfined *** dams can inhibit the invasion of saltwater,and the low-permeability layer(LPL)and tide action can increase the effect of subsurface dams and the removal rate of residual *** sensitivity analysis,it was discovered that shifting the dam location towards the inland resulted in a reduction in the effective heights of the *** upper saline plume contracted with increasing dam height,and the upper boundary of LPL was moved to shallower *** the natural removal time increased significantly with increasing dam height and the bottom boundary of LPL was moved to deeper *** addition,if the dam location was close to the sea boundary and the bottom boundary of LPL was moved to deeper regions,we could increase the subsurface dam height to reduce the risks of control of saltwater *** study provides us a comprehensive understanding of the complex hydrodynamics of saltwater intrusion and provides guides for the design of subsurface dams aimed at saltwater intrusion control in stratified coastal aquifers.

关键词： stratified subsurface dams saltwater intrusion residual saltwater natural removal

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Emergence of instability-driven domains in soft stratified materials

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npj Computational Materials 2022年第1期8卷 931-936页

作者： Jian Li Viacheslav Slesarenko Stephan Rudykh Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentral South UniversityChangshaHunan410075China Joint International Research Laboratory of Key Technology for Rail Traffic Safety Central South UniversityChangsha410075China National&Local Joint Engineering Research Center of Safety Technology for Rail Traffic Vehicle Central South UniversityChangsha410075China Cluster of Excellence livMatS@FIT–Freiburg Center for Interactive Materials and Bioinspired Technologies University of FreiburgGeorges-Köhler-Allee 105D-79110FreiburgGermany Department of Mechanical Engineering University of Wisconsin—MadisonMadisonWI53706USA School of Mathematical&Statistical Sciences National University of Ireland GalwayUniversity RoadGalwayIreland

Nature frequently employs the buckling phenomenon to facilitate the formation of complicated patterns across *** knowledge,however,is limited to a small set of buckling-induced microstructure transformations in soft composites;and the pattern formation phenomenon remains largely unknown for a vast pool of material ***,we investigate the unexplored rich domain of soft heterogeneous *** experimentally observe the formation of instability-driven domains in stratified composites with a non-dilute stiff *** illustrate that the discovered domain patterns are energetically favorable over ***,we introduce a closed-form analytical expression allowing us to predict the evolution of the patterns in the post-buckling ***,we show that various patterns can be pre-designed via altering material *** findings can help advance our understanding of the mechanisms governing pattern formations in soft biological tissues,and potentially enable the platform for mechanical metamaterials.

关键词： composites buckling stratified

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Vortical structures and wakes of a sphere in homogeneous and density stratified fluid

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Journal of Hydrodynamics 2021年第2期33卷 207-215页

作者： Liu-shuai Cao Feng-lai Huang Cheng Liu De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil Engi-neeringShanghai Jiao Tong UniversityShanghai 200240China Ocean College Zhejiang UniversityZhoushan 316021China

Vortical structures and wakes of bluff bodies in homogenous and stratified environment are common and important in ocean *** on the Boussinesq approximation,a thermocline model is proposed to deal with the variable density stratified fluid,and implemented in the commercial software Simcenter STAR-CCM+*** improved delayed detached eddy simulation(IDDES)modeling method is adopted to resolve the coherent vortical structures and turbulent wakes precisely and *** conditions consisting of one homogenous and three stratified fluid cases with different density gradient past a sphere at Reynolds number 3700 are *** show that density stratification has a great impact on the vortical structures,the vertical motion is suppressed and internal waves will be induced and propagated,which is very different with that of homogenous *** the stratification strength increases,the vortical structures are gradually flattened,the asymmetry and anisotropy between vertical and horizontal motions are enhanced.

关键词： Vortical structures wakes sphere homogenous stratified fluid

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Seepage failure by heave in sheeted excavation pits constructed in stratified cohesionless soils

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Frontiers of Structural and Civil Engineering 2019年第6期13卷 1415-1431页

作者： Serdar KOLTUK Jie SONG Recep IYISAN Rafig AZZAM HPC AG Stuttgart 70597Germany Department of Engineering Geology and Hydrogeology RWTH Aachen UniversityAachen D-52064Germany Civil Engineering Faculty Istanbul Technical UniversityIstanbul 34646Turkey

In this study,experimental and numerical investigations are performed to clarify the seepage failure by heave in sheeted excavation pits in stratified cohesionless soils in which a relatively permeable soil layer(Kupper)lies above a less permeable soil layer(Klower)between excavation base and wall *** is shown that the evaluation of base stabilities of excavation pits against seepage failure by using Terzaghi and Peck's approach leads to considerably lower critical potential differences than those obtained from the model *** the other hand,a relatively good agreement is achieved between the results of the model tests and the finite element(FE)*** investigations are performed by using axisymmetric excavation models with various dimensions and ground conditions,and a comparison between the results obtained from Terzaghi and Peck's approach and finite element analyses is given.

关键词： seepage failure by heave cohesionless stratified soil model test Terzaghi and Peck's approach FE analysis

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Fabrication of flower-like mesoporous TiO_2 hierarchical spheres with ordered stratified structure as an anode for lithium-ion batteries

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Journal of Materials Science & Technology 2019年第4期35卷 667-673页

作者： Yujie Zheng Bingjie Liu Pei Cao Hui Huang Jing Zhang Guowei Zhou Key Laboratory of Fine Chemicals in Universities of Shandong School of Chemistry and Pharmaceutical EngineeringQilu University of Technology (Shandong Academy of Sciences)

In this study, flower-like mesoporous TiO_2 hierarchical spheres(FMTHSs) with ordered stratified structure and TiO_2 nanoparticles(TNPs) were synthesized via a facile solvothermal route and an etching reaction. Multilamellar vesicles(MTSVs) and unilamellar TiO_2/SiO_2 vesicles(UTSVs) were prepared using cetyltrimethylammonium bromide and didodecyldimethylammonium bromide as structure-directing agents under different solvothermal conditions. FMTHSs and TNPs were obtained from the etching reactions of MTSVs and UTSVs, respectively, in an alkaline system. FMTHSs display flower-like, ordered stratified structures on each petal. The thickness of the ordered stratified structure is approximately3–6 nm, and the number of layers is approximately 2–4. The FMTHSs2 electrode exhibits the first discharge capacity of 212.4 m A h g^(-1) at 0.2 C, which is higher than that of TNPs electrode(167.6 mA h g^(-1)).The discharge specific capacity of FMTHSs2 electrode after 200 cycles at 1 C is 105.9 mA h g^(-1), which is higher than that of TNPs electrode(52.2 mA h g^(-1)) after the same number of cycles. The outstanding performance of FMTHSs2 electrode is attributed to the advantages of FMTHSs. In particular, their own stratified structure can provide additional active sites for reactions. The hierarchical structure can provide short diffusion length for Li^+, large electrolyte–electrode contact area, and superior accommodation of the strain of Li+intercalation/deintercalation.

关键词： Lithium ion batteries Flower-like TiO2 spheres stratified structure Multialmellar TiO2/SiO2 vesicles Controllable morphology

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Mechanical properties and failure modes of stratified backfill under triaxial cyclic loading and unloading

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International Journal of Mining Science and Technology 2019年第5期29卷 809-814页

作者： Wang Jie Song Weidong Cao Shuai Tan Yuye School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education Beijing 100083China

Multiple filling of gobs will lead to a layered structure of the *** explore the influence of layering structure on the mechanical properties and failure modes of backfill,different backfill specimens were prepared with a cement/sand ratio of 1:4,a slurry concentration of 75%,and backfilling times of 1,2,3 and 4,*** cyclic loading and unloading experiments were carried *** results show that with an increase in backfilling time,the peak strength of backfill decreases as a polynomial function and the peak strain increases as an exponential *** cyclic load enhances the linear characteristic of backfill *** loading and unloading deformation moduli have a linear negative correlation with the backfilling *** unloading deformation modulus is always slightly higher than the loading deformation *** failure modes of stratified backfill are mainly characterized by conjugate shear failure at the upper layer and tensile failure across the layer plane,and there is usually no damage in the lower layer away from the loading area.

关键词： stratified backfill Triaxial cyclic loading and unloading Mechanical properties Failure modes Deformation modulus

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A dynamic subgrid-scale model for the large eddy simulation of stratified flow

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Science China Mathematics 2000年第4期43卷 391-399页

作者：刘宁宇陆夕云庄礼贤 Department of Modem Mechanics University of Science and Technology of China Hefei 230026 China

A new dynamic subgrid-scale (SGS) model, including subgrid turbulent stress and heat flux models for stratified shear flow is proposed by using Yoshizawa’ s eddy viscosity model as a base model. Based on our calculated results, the dynamic subgrid-scale model developed here is effective for the large eddy simulation (LES) of stratified turbulent channel flows. The new SGS model is then applied to the large eddy simulation of stratified turbulent channel flow under gravity to investigate the coupled shear and buoyancy effects on the near-wall turbulent statistics and the turbulent heat transfer at different Richardson numbers. The critical Richardson number predicted by the present calculation is in good agreement with the value of theoretical analysis.

关键词： large eddy simulation (LES) subgrid-scale model (SGS) stratified turbulence heat transfer.

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stratified Gravity Anomaly of the Chinese Continent and Its Geological Significance——The Test and Combined Application of Seismic Tomography

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Chinese Science Bulletin 1993年第11期38卷 935-939页

作者：王谦身杨新社吴华刘建华 Institute of Geophysics Academia SinicaBeijing 100101 PRC

It is highly needed to develop an effective method to test the reliability of the 3-D stratified velocity structure of the earth’s crust and upper mantle obtained by using the seismic tomography (ST) and to make full use of the ST results. In this note, a new method named stratified gravity anomaly (SGA) is presented. It not only can provide the stratified gravity effect of different layers in the earth’s interior but also can be used to test the results of the seismic tomography. Here, the research is mainly concentrated

关键词： stratified gravity anomaly seismic tomography 3-D density structure 3-D velocity structure Chinese continent.

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Modelling the flexural buckling failure of stratified rock slopes based on the multilayer beam model

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Journal of Mountain Science 2019年第5期16卷 1170-1183页

作者： ZHANG Yan-jun NIAN Ting-kai GUO Xing-sen CHEN Guang-qi ZHENG Lu State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Department of Civil and Structural Engineering Faculty of Engineering Kyushu University College of Civil Engineering Fuzhou University

The buckling failure of stratified rock slopes intersected by a set of steep discontinuities that are approximately parallel to the slope surface is frequently encountered while constructing railways and roadways in mountainous areas. In this study, an analytical approach based on the energy equilibrium principle is presented to solve the flexural buckling stability of stratified rock slopes within the framework of multilayer beam theory. The generalized HoekBrown failure criterion is introduced to reflect the influences of slope size(scale effects) on the buckling stability. Subsequently, numerical and physical modellings from previous literatures are employed to validate the proposed approach. Furthermore, a practical case of Bawang Mountain landslide is also used for the comparative analysis. The study shows that the present analytical approach is capable to provide a more reasonable assessment for the buckling failure of stratified rock slopes, compared with several existing analytical approaches. Finally, a detailed parametric study is implemented, and the results indicate that the effects of rock strength, rock deformation modulus, geological strength index, layer thickness and disturbance degree of rock mass on the buckling failure of stratified rock slopes are more significant than that of rock type and slope angle.

关键词： Slope stability stratified rock Buckling Scale effect Bawang Mountain

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