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The effects of total ankle replacement on ankle joint mechanics during walking

Journal of Sport and Health Science 2017年第3期6卷 340-345页

作者： henry Wang Scott R.Brown Biomechanics Laboratory School of KinesiologyBall State University Sports Performance Research Institute New Zealand(SPRINZ) Auckland University of Technology

Background:End-stage ankle arthritis impairs joint function and patients' *** ankle replacement is a surgical procedure to treat severe ankle *** Talaris Anatomic Ankle^(TM)(STAA) was designed to mimic the normal ankle anatomy and flexion/extension of the ankle *** purpose of this study was to examine the effect of an STAA ankle replacement on ankle joint function and mechanics during ***:Five patients with end-stage unilateral ankle arthritis were *** performed level walking in a laboratory setting on 2occasions,prior to and 3 months after the STAA ankle *** Orthopedic Foot and Ankle Society(AOFAS) hindfoot score was obtained.A 12-camera motion capture system was used to perform walking *** temporo-spatial parameters and ankle joint mechanics were *** Student's t tests and non-parametric Wilcoxon matched tests were performed to examine the differences in biomechanical variables between the pre-and post-surgery walking ***:Compared to the pre-surgical condition,at 3 months of post-STAA surgery,patients experienced greater improvement in AOFAS hindfoot score(p = 0.0001);the STAA ankle demonstrated a 31% increase in ankle joint excursion(p = 0.045),a 22% increase in ankle plantarflexor moment(p = 0.075),a 60% increase in ankle power absorption(p = 0.023),and a 68% increase in ankle power production(p = 0.039).Patients also demonstrated a 26% increase in walking speed(p = 0.005),a 20% increase in stride length(p = 0.013),a 15% decrease in double support time(p = 0.043),and a 5% decrease in total stance time(p = 0.055).Conclusion:Three months after surgeries,the STAA patients experienced improvements in ankle function and gait *** STAA ankle demonstrated improved ankle mechanics during daily activities such as walking.

关键词： Ankle mechanics AOFAS score Arthritis Gait analysis Total ankle replacement Walking

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Characterization of Baram and Tanjung sands as potential proppants

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Energy Geoscience 2021年第3期2卷 175-180页

作者： henry Elochukwu Kenneth Kho Khai Kiat Department of Petroleum Engineering Curtin UniversityCDT25098009MiriSarawakMalaysia

Baram and Tanjung sands were evaluated for potential use as *** was conducted on Baram and Tanjung sands following ISO and ASTM recommended *** showed that Baram and Tanjung sand mineralogy is predominantly quartz with presence of metal *** descriptors of both sands for sphericity and roundness were above *** sand was retained by 20/40 mesh size with mean size of 448.2 mm,bulk density of 1.32 g/cc,acid solubility of 1.5%and crush resistance of 4000 *** Tanjung sand was retained by 30/50 mesh size with mean size of 383.2 mm,bulk density of 1.30 g/cc,acid solubility of 1.20%and crush resistance of 8000 *** indicates that Baram sand has larger grain size that supports high permeability at low closure stress,making this sand suitable for shallow depth hydraulic fracturing operations,whereas Tanjung sand is more suitable for deeper domains with high closure *** results and economic comparison with commercial frac sand and other proppant types support using Baram and Tanjung sands as potential proppants.

关键词： Baram sand Tanjung sand Crush resistance Proppant Hydraulic fracturing

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Anatomical changes correlated with chronic pain in forensic medicine

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Forensic Sciences Research 2017年第3期2卷 145-151页

作者： henry J Carson Linn County Medical Examiner’s Office(retired) Cedar RapidsIAUSA

This study was performed to determine the relationships between chronic pain and anatomic changes that may occur in the *** were performed on fatalities that required death investigation in Linn County,IA,or adjacent and nearby *** with chronic pain were older than the control population at the time of ***,hypertension and depression were more common in persons with chronic *** causes of death may also have been related to chronic *** heart,lungs,liver,spleen and kidneys were significantly heavier in persons with chronic pain;emphysema and pleural and abdominal adhesions were more common in persons with chronic *** appear to have been diffuse changes in the body related to chronic *** changes may have been mediated by a number of systemic mechanisms that are involved with chronic pain,including cardiovascular activity,the immune system,the neuroendocrine system and others.

关键词： Forensic medicine pain,chronic depression emphysema adhesions tissue

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Reduction of Tobacco Smoking Health Risk Through an Appropriate Media Based Communication Strategy in Uganda

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Chinese Journal of Population,Resources and Environment 2010年第3期8卷 59-66页

作者： henry Musoke Semakula Graduate Student Human Ecology Department Vrije Universiteit Brussel Laarbeeklaan 107 B-1090 C98 Brussels Belgium

The health impacts of tobacco consumption are well documented and have gained acceptance worldwide. Today, a substantial, preventable burden of tobacco attributable diseases exists in most countries, though in most of the cases, unknown. Smoking accounts for almost half of the deaths in middle age in some regions. In Uganda, translating findings into policy action is slow and involves several stakeholders. It will continue to require support from tobacco control campaign groups. This paper analyses secondary literature on tobacco smoking and later provides an appropriate medium based communication strategy that can be adopted to counteract the persuasive smoking evil adverts of tobacco companies as well as creating awareness among the population of the health impacts caused by smoking.

关键词： communication strategy tobacco smoking risks public health

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Wavelet-based deconvolution of ultrasonic signals in nondestructive evaluation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第10期7卷 1748-1756页

作者： HERRERA Roberto henry OROZCO Rubén RODRIGUEZ Manuel Department of Informatics University of Cienfuegos Cienfuegos 59430 Cuba CEETI Central University of Las Villas Santa Clara 54830 Cuba Department of Physics Central University of Las Villas Santa Clara 54830 Cuba

In this paper, the inverse problem of reconstructing reflectivity function of a medium is examined within a blind deconvolution framework. The ultrasound pulse is estimated using higher-order statistics, and Wiener filter is used to obtain the ultrasonic reflectivity function through wavelet-based models. A new approach to the parameter estimation of the inverse filtering step is proposed in the nondestructive evaluation field, which is based on the theory of Fourier-Wavelet regularized deconvolution (ForWaRD). This new approach can be viewed as a solution to the open problem of adaptation of the ForWaRD framework to perform the convolution kernel estimation and deconvolution interdependently. The results indicate stable solutions of the esti- mated pulse and an improvement in the radio-frequency (RF) signal taking into account its signal-to-noise ratio (SNR) and axial resolution. Simulations and experiments showed that the proposed approach can provide robust and optimal estimates of the reflectivity function.

关键词： Blind deconvolution Ultrasonic signals processing Wavelet regularization

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Matrix-Free Higher-Order Finite Element Method for Parallel Simulation of Compressible and Nearly-Incompressible Linear Dedicated to Professor Karl Stark Pister for his 95th birthday Elasticity on Unstructured Meshes

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Computer Modeling in Engineering & Sciences 2021年第12期129卷 1283-1303页

作者： Arash Mehraban henry Tufo Stein Sture Richard Regueiro Department of Computer Science University of Colorado BoulderBoulderCOUSA Department of Civil Environmentaland Architectural EngineeringUniversity of Colorado BoulderBoulderCOUSA

Higher-order displacement-based finite element methods are useful for simulating bending problems and potentially addressing mesh-locking associated with nearly-incompressible elasticity,yet are computationally *** address the computational expense,the paper presents a matrix-free,displacement-based,higher-order,hexahedral finite element implementation of compressible and nearly-compressible(ν→0.5)linear isotropic elasticity at small strain with p-multigrid *** cost,solve time,and scalability of the implementation with respect to strain energy error are investigated for polynomial order p=1,2,3,4 for compressible elasticity,and p=2,3,4 for nearly-incompressible elasticity,on different number of CPU cores for a tube bending *** the context of this matrix-free implementation,higher-order polynomials(p=3,4)generally are faster in achieving better accuracy in the solution than lower-order polynomials(p=1,2).However,for a beam bending simulation with stress concentration(singularity),it is demonstrated that higher-order finite elements do not improve the spatial order of convergence,even though accuracy is improved.

关键词： Matrix-free higher-order finite element parallel linear elasticity multigrid solvers unstructured meshes

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Influence of particle contact models on soil response of poorly graded sand during cavity expansion in discrete element simulation

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第6期10卷 1154-1170页

作者： Yang Dong Behzad Fatahi Hadi Khabbaz henry Zhang School of Civil and Environmental Engineering University of Technology Sydney (UTS) WSP in Australia & New Zealand Sydney Office

The discrete element method(DEM) has been extensively adopted to investigate many complex geotechnical related problems due to its capability to incorporate the discontinuous nature of granular materials. In particular, when simulating large deformations or distortion of soil(e.g. cavity expansion),DEM can be very effective as other numerical solutions may experience convergence problems. Cavity expansion theory has widespread applications in geotechnical engineering, particularly to the problems concerning in situ testing, pile installation and so forth. In addition, the behaviour of geomaterials in a macro-level is utterly determined by microscopic properties, highlighting the importance of contact models. Despite the fact that there are numerous contact models proposed to mimic the realistic behaviour of granular materials, there are lack of studies on the effects of these contact models on the soil ***, in this study, a series of three-dimensional numerical simulations with different contact constitutive models was conducted to simulate the response of sandy soils during cylindrical cavity expansion. In this numerical investigation, three contact models, i.e. linear contact model, rolling resistance contact model,and Hertz contact model, are considered. It should be noted that the former two models are linear based models, providing linearly elastic and frictional plasticity behaviours, whereas the latter one consists of nonlinear formulation based on an approximation of the theory of Mindlin and Deresiewicz. To examine the effects of these contact models, several cylindrical cavities were created and expanded gradually from an initial radius of 0.055 m to a final radius of 0.1 m. The numerical predictions confirm that the calibrated contact models produced similar results regarding the variations of cavity pressure, radial stress, deviatoric stress, volumetric strain, as well as the soil radial displacement. However, the linear contact model may resu

关键词： Discrete element method(DEM) Cavity expansion Contact models Behaviour of geomaterials

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Forage breeding and cultivar development:A 50-year perspective

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Grassland Research 2023年第2期2卷 97-105页

作者： Joseph henry Bouton Institute of Plant Breeding Geneticsand GenomicsUniversity of GeorgiaAthensGeorgiaUSA Bouton Consulting Group LLCAthensGeorgiaUSA

This article represents the perspective of one retired,academic forage breeder and cultivar developer after 50 years of working *** cultivars that help farmers within pastoral agriculture is the main goal,a system where livestock is the *** Grassland Congress proceedings,as well as the general literature,are historical guides for the state of forage *** was achieved through technologies;better equipment for planting and harvesting;and advances in computer computation and *** achievements were fitful and continue to *** performance mean-reversion,cost to the program,and what the farmer seed buyer was willing to pay are important considerations for applying any technology,especially *** promises were too *** was due,in part,to a lack of understanding that traditional phenotypic/genotypic field selection programs operate in a complex way with multiple species and several traits screened simultaneously at a modest *** majority of current forage cultivars are from field-based *** participation at scientific conferences declined over time,with less sharing of information the *** developers will continue using basic field selection methods but should explore applying any technology;just be clever on when,how,and with whom to use *** advice and experiences are also presented and discussed.

关键词： biotechnologies breeding cultivars farmers forages genetics livestock pastures

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Fire alters the availability of soil nutrients and accelerates growth of Eucalyptus grandis in Zambia

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Journal of Forestry Research 2020年第5期31卷 1637-1645页

作者： Donald Chungu Phillimon Ng’andwe henry Mubanga Felix Chileshe School of Natural Resources Copperbelt UniversityP.O.Box 21692KitweZambia Directorate of Distance Education and Open Learning Copperbelt UniversityP.O.Box 21692KitweZambia

Fire has been used to prepare land during tree plantation establishment for many years but uncertainty about how ecosystems respond to prescribed burning makes it difficult to predict the effects of fire on soil *** aim of this study was to determine the effect of burning accumulated forest residues(slash)on soil chemical properties and how trees *** analyzed 40 burned and unburned sites and compared growth of Eucalyptus grandis *** ex Maiden between *** pH increased by 39%after fire,suggesting reduced soil acidity and increased *** nitrogen increased by 100%;other nutrients(Ca^2+,Mg^2+and K^+)also *** in nutrients had a significant effect on the growth of ***;larger and taller trees were associated more with burned than unburned *** study provides evidence that burning accumulated slash during land preparation prior to plantation establishment alters soil nutrient status and enhances the growth of ***.

关键词： Nitrogen mineralization Forest residue burning Soil nutrients Zambia exotic plantations Plantation establishment Eucalyptus grandis

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Targeting chronic and evolving neuroinflammation following traumatic brain injury to improve long-term outcomes: insights from microglial-depletion models

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Neural Regeneration Research 2021年第5期16卷 976-977页

作者： Rebecca J.henry David J.Loane Department of Anesthesiology and Shock Trauma and Anesthesiology Research(STAR)CenterUniversity of Maryland School of MedicineBaltimoreMDUSA School of Biochemistry and Immunology Trinity Biomedical Sciences InstituteTrinity CollegeDublinIreland

Microglia,the resident innate immune cells of the central nervous system(CNS),play important roles in brain development,maintenance,and *** brain sentinels,microglia adopt a surveillant state in healthy tissue characterized by a ramified scanning morphology that maintains CNS homeostasis and contributes to learningassociated synaptic plasticity.

关键词： inflammation homeostasis traumatic

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