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Review of the optimal timing and technique for extensor tendon reconstruction in composite dorsal hand wounds

Plastic and Aesthetic Research 2019年第8期6卷 1-9页

作者： Shelby Lies Asher Horowitz Gordon Lee andrew y.zhang Department Plastic Surgery University Texas SouthwesternDallasTX 75390USA Department Plastic Surgery Stanford UniversityPalo AltoCA 94304USA

Aim: The management of complex dorsal hand wounds with extensor tendon loss is controversial. Treatment has focused on soft tissue coverage, but there is limited evidence comparing immediate vs. staged tendon reconstruction. This review evaluates existing literature to determine the optimal management of composite hand defects. Methods: A MEDLINE database review was performed including objective measurements such as number of operations, total active motion, grip strength, days to maximum range of motion (ROM), and return to work. Data extraction included demographics, surgical techniques, complications, and relative outcome. We compared primary and secondary staged reconstruction to correlate any significant differences in outcome and determine optimal timing and technique for extensor tendon reconstruction. We extracted information on flap types including regional and free tissue transfer with tendinous components vs. staged tendon grafts. Results: Comparison of outcomes showed that patients with immediate reconstruction had fewer operations, faster return to maximum ROM, and greater chance of returning to work. The most successful single stage flaps include the radial forearm, suitable for reconstructing one to three tendons and the dorsalis pedis for three or four tendons;however, there were significantly more complications in immediate reconstruction particularly regarding donor site morbidity. Pedicled flaps had better total active motion. The two-stage approach resulted in acceptable functional outcomes without significant complications. ;Conclusion: Immediate cutaneous tendinous flaps have clear advantages over staged approaches for reconstruction ofcomposite dorsal hand wounds. Benefits include less operations, faster time to maximum ROM, and higher percent of patients returning to work;however, significantly more flap related complications were seen. Immediate pedicled radial forearm provided the best total active motion with least complications. When pati

关键词： Composite dorsal hand wound flap extensor tendon reconstruction

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Progressive trends in timing and imaging of lower extremity reconstruction

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Plastic and Aesthetic Research 2019年第12期6卷 26-36页

作者： andrew y.zhang David Cholok Gordon K.Lee Department of Plastic Surgery University of Texas Southwestern Medical CenterDallasTXUSA Division of Plastic and Reconstructive Surgery Stanford UniversityPalo AltoCAUSA

The salvage of mangled lower-extremities after severe injury remains a daunting operative dilemma,but one that continues to evolve with advances in microsurgical and orthopedic ***,trends in clinical practice including the decision to salvage and timing of soft-tissue coverage are changing in concordance with improvements in wound care,flap selection for soft-tissue provision,and preoperative *** to these improvements,more complex wounds are increasingly eligible for *** remains unclear,however,whether success in limb salvage confers improved functional patient *** present a review of the literature tracing recent advances in the salvage of mangled extremities following traumatic injury,with a focus on practice trends regarding timing of reconstruction,operative approaches,and preoperative imaging.

关键词： Lower extremity reconstruction propeller flaps amputation microsurgery trauma

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Proper orthogonal decomposition analysis of coherent motions in a turbulent annular jet

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Applied Mathematics and Mechanics(English Edition) 2021年第9期42卷 1297-1310页

作者： y.zhang M.VANIERSCHOT Department of Mechanical Engineering Group T Leuven CampusCelestijnenlaan 300Leuven B-3001Belgium

A three-dimensional incompressible annular jet is simulated by the large eddy simulation(LES)method at a Reynolds number Re=*** time-averaged velocity field shows an asymmetric wake behind the central bluff-body although the flow geometry is *** proper orthogonal decomposition(POD)analysis of the velocity fluctuation vectors is conducted to study the flow dynamics of the wake *** distribution of turbulent kinetic energy across the three-dimensional POD modes shows that the first four eigenmodes each capture more than 1%of the turbulent kinetic energy,and hence their impact on the wake dynamics is *** results demonstrate that the asymmetric mean flow in the near-field of the annular jet is related to the first two POD modes which correspond to a radial shift of the stagnation *** modes 3 and 4 involve the stretching or squeezing effects of the recirculation region in the radial *** addition,the spatial structure of these four POD eigenmodes also shows the counter-rotating vortices in the streamwise direction downstream of the flow reversal region.

关键词： coherent structure proper orthogonal decomposition(POD) turbulent annular jet large eddy simulation(LES)

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Enhancement of Sinter Densification of SrO-BaO-Nb_2O_5-SiO_2 Tungsten-Bronze Glass-Ceramics by Doping with P_2O_5

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Journal of Materials Science & Technology 2013年第8期29卷 731-736页

作者： J.C.Chen y.zhang Shenyang Research and Development Centre for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences State Key Laboratory of New Ceramics and Fine Processing Institute of Nuclear and New Energy TechnologyTsinghua University

Densification behaviors of SrO-BaO-Nb2O5-SiO2 based glass-ceramics prepared by conventional sintering were investigated with an emphasis on the influence of P2O5 content. Although P2O5 dopant did not modify the surface crystallization mechanism, it resulted in a decrease of the glass transition temperature, which facilitates the viscous glass flow necessary for sintering. However, premature crystallization of （Sr, Ba）Nb2O6 induced by addition of excess amount of P2O5 essentially retarded sintering due to the formation of closed pores in the matrix. The SrO-BaO-Nb2O5-SiO2 glass with 1.0 mol% P2O5 （SBN-1P） showed the best sinter densification, which was accomplished at about 850 ℃.

关键词： Sintering densification DieLectric properties Glass-ceramic

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Exercise preconditioning alleviates ischemia-induced memory deficits by increasing circulating adiponectin

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Neural Regeneration Research 2025年第5期20卷 1445-1454页

作者： Meifeng Zheng Borui zhang Sonata S y yau Kwok-Fai So Li zhang Haining Ou Department of Rehabilitation Medicine Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation Medicine The Fifth Clinical College of Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Key Laboratory of CNS Regeneration(Ministry of Education) Guangdong-Hong Kong-Macao Institute of CNS RegenerationJinan UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation Sciences The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina State Key Laboratory of Brain and Cognitive Science Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administrative RegionChina Center for Exercise and Brain Science School of PsychologyShanghai University of SportShanghaiChina Neuroscience and Neurorehabilitation Institute University of Health and Rehabilitation SciencesQingdaoShandong ProvinceChina

Cerebral ischemia is a major health risk that requires preventive approaches in addition to drug *** exercise enhances neurogenesis and synaptogenesis,and has been widely used for functional rehabilitation after *** this study,we determined whether exercise training before disease onset can alleviate the severity of cerebral *** also examined the role of exercise-induced circulating factors in these *** mice were subjected to 14 days of treadmill exercise training before surgery for middle cerebral artery *** found that this exercise pre-conditioning strategy effectively attenuated brain infarct area,inhibited gliogenesis,protected synaptic proteins,and improved novel object and spatial memory *** analysis showed that circulating adiponectin plays a critical role in these preventive effects of *** activation of adiponectin receptors by Adipo Ron mimicked the effects of exercise,while inhibiting receptor activation abolished the exercise *** summary,our results suggest a crucial role of circulating adiponectin in the effects of exercise pre-conditioning in protecting against cerebral ischemia and supporting the health benefits of exercise.

关键词： adiponectin cerebral ischemia exercise pre-conditioning hippocampus memory function middle cerebral artery occlusion prefrontal cortex synaptic proteins treadmill exercise

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Attitude control for part actuator failure of agile small satellite

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Acta Mechanica Sinica 2008年第4期24卷 463-468页

作者： J.R.zhang A.Rachid y.zhang Beijing Institute of Technology School of Aerospace Science and Engineering 100081 Beijing China Univercite de Picardie-Jules Veme 80000 Amiens France

The stability and singularity problem of agile small satellite （ASS） with actuator failure is discussed in this paper. Firstly, the three-axis stabilized controller of an ASS is designed, where micro control moment gyros （MCMG＇s） in pyramid configuration （PC） is used as the actuator. By using the same controller and steering law, the control results before and after one gyro fails are compared by simulation. The variation of singular momentum envelope before and after one gyro fails is also compared. The simulation results show that the failure intensively decreases the capacity of output torque, which leads to the emergence of more singular points and the rapid saturation of MCMG＇s. Finally, the parameters of system controller are changed to compare the control effect.

关键词： Micro control moment gyros (MCMG's) · Gyro failure ·Singularity analysis · Agile small satellite

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Improving sampling depth of laser speckle imaging by topical optical clearing:A theoretical and in vivo study

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Journal of Innovative Optical Health Sciences 2020年第2期13卷 33-43页

作者： D.Li y.zhang B.Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049P.R.China

The effect of optical cleaning method combined with laser speckle imaging(LSI)was discussed to improve the detection depth of LSI due to high scattering characteristics of skin,which limit its clinical application.A double-layer skin tissue model embedded with a single blood vessel was established,and the Monte Carlo method was used to simulate photon propagation under the action of light-permeating agent.808 nm semiconductor and 632.8 nm He–Ne lasers were selected to study the e®ect of optical clearing agents(OCAs)on photon deposition in *** show that the photon energy deposition density in the epidermis increases with the amount of tissue°uid replaced by *** with glucose solution,polyethylene glycol 400(PEG 400)and glycerol can considerably increase the average penetration depth of photons in the skin tissue,thereby raising the sampling depth of the *** the action of glycerol,PEG 400,and glucose,the average photon penetration depth is increased by 51.78%,51.06%,and 21.51%for 808nm,68.93%,67.94%,and 26.67%for 632.8 nm lasers,*** vivo experiment by dorsal skin chamber proves that glycerol can cause a substantial decrease in blood°ow rate,whereas PEG 400 can signicantly improve the capability of light penetration without a®ecting blood velocity,which exhibits considerable potential in the monitoring of blood°ow in skin tissues.

关键词： Laser speckle image topical optical clearing imaging depth Monte-Carlo simulation dorsal skin experiment

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Frequency equations of nonlocal elastic micro/nanobeams with the consideration of the surface effects

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Applied Mathematics and Mechanics(English Edition) 2018年第8期39卷 1089-1102页

作者： H.S.ZHAO y.zhang S.T.LIE School of Civil and Environmental Engineering Nanyang Technological University

A nonlocal elastic micro/nanobeam is theoretically modeled with the consideration of the surface elasticity, the residual surface stress, and the rotatory inertia,in which the nonlocal and surface effects are considered. Three types of boundary conditions, i.e., hinged-hinged, clamped-clamped, and clamped-hinged ends, are examined. For a hinged-hinged beam, an exact and explicit natural frequency equation is derived based on the established mathematical model. The Fredholm integral equation is adopted to deduce the approximate fundamental frequency equations for the clamped-clamped and clamped-hinged beams. In sum, the explicit frequency equations for the micro/nanobeam under three types of boundary conditions are proposed to reveal the dependence of the natural frequency on the effects of the nonlocal elasticity, the surface elasticity, the residual surface stress, and the rotatory inertia, providing a more convenient means in comparison with numerical computations.

关键词： Fredholm integral equation micro/nanobeam natural frequency nonlocal elasticity surface effect

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Cosmic Justice and Sanctioned Violence:The Huangdi yinfujing and the Legitimacy of War in Religious Daoism

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世界宗教文化 2012年第2期 13-22页

作者： Ellen y.zhang Hong Kong Baptist University

《黄帝阴符经》或《阴符经》是道教传统中一部极为主要的文本。虽然文本作者不详,而且篇幅短小、语义晦涩,但自唐代以来一直被当作奇书,引发多种注释与解读:内丹修炼抑或兵家谋略。本文以(唐)李荃注释本为主,阐述《阴符经》有关阴阳、... 详细信息

《黄帝阴符经》或《阴符经》是道教传统中一部极为主要的文本。虽然文本作者不详,而且篇幅短小、语义晦涩,但自唐代以来一直被当作奇书,引发多种注释与解读:内丹修炼抑或兵家谋略。本文以(唐)李荃注释本为主,阐述《阴符经》有关阴阳、生杀、机时、五贼、三盗等所涵盖的道家/道教的本体-宇宙观,并以此论述就有关暴力与战争议题所展示的道教伦理观。笔者认为,《阴符经》在重玄思辨中,强调道教"治身治国"的理念,其暗含的"义战"思想亦带有一定的黄老印记。

关键词： Religious Daoism,Huangdi yinfujing,War,Peace

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Numerical modeling of the formation of Indo-Sinian peraluminous granitoids in Hunan Province:Basaltic underplating versus tectonic thickening

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Science China Earth Sciences 2002年第11期45卷 1042-1056页

作者：王岳军 y.zhang 范蔚茗席先武郭锋林舸 1. Guangzhou Institute of Geochemistry Chinese Academy of Sciences 510640 Guangzhou China 2. CSIRO Division of Exploration ?p Mining 6109 Perth Australia

The genesis of Indo-Sinian granitic plutons with peraluminous and potassium-rich affinities from Hunan Province, China has been investigated by numerical modeling using the numerical code FLAC. On the basis of the regional geological evolution in South China, we employed a realistic numerical model in an attempt to unravel the influences of basaltic underplating and tectonic crustal thickening on the crustal anatexis. Heat production derived from basaltic underplating (e.g. ca. 220 Ma gabbro xenoliths) can result in dehydration melting of fluid-bearing minerals in crustal rocks such as gneisses and metapelites, but its effect is limited in a relatively short time span (5-15 Ma) and on a small scale. Accordingly, it is very difficult for basaltic underplating to generate the large-scale Indo-Sinian granitic bathliths unless voluminous mafic magmas had been underplated at the lower/middle crust during this period. Alternatively, crustal thickening induced by tectonic compression can also lead to geothermal elevation, during which the temperature at the boundary between lower and middle crusts can be up to or greater than 700°C, triggering dehydration melting of muscovite in gneiss and metapelite. The proportion of melts from muscovite-induced dehydration melting is close to critical melt percentage (?20%) once the thickening factor reaches 1.3. These melts can be effectively transferred to the crust-level magma chamber and form large-scale granitic batholiths. In combination with the Indo-Sinian convergent tectonic setting in South China as well as sparse outcrops of contemporary mafic igneous rocks, we consider that tectonic crustal thickening is likely to be the predominant factor controlling the formation of the Indo-Sinian peraluminous and potassium-rich granitoids in Hunan Province.

关键词： Indo-Sinian granitoids, dehydrated melting, basaltic undedrplating, tectonic thickening, numerical modeling,Hunan Province.

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