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https://www.readbyqxmd.com/read/28324776/microstructural-evolution-of-ti6al4v-in-ultrasonically-assisted-cutting-numerical-modelling-and-experimental-analysis
#1
Wei Bai, Ronglei Sun, Jürgen Leopold, Vadim V Silberschmidt
This paper aims to elucidate the effect of ultrasonically assisted cutting (UAC) on microstructure in a machined surface and a chip of Ti6Al4V alloy. To investigate microstructural evolution, a FE-based cutting model with an enhanced material formulation and temperature dependent material properties was developed. A Johnson-Mehl-Avrami-Kolmogorov (JMAK) model for the Ti6Al4V alloy was employed to simulate dynamic recrystallization and predict a resultant grain size. Due to a specific thermomechanical load in UAC, the distributions of strains, strain rates and temperatures in a workpiece in the machining process were investigated...
March 9, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28324316/l2-word-recognition-influence-of-l1-orthography-on-multi-syllabic-word-recognition
#2
Megumi Hamada
L2 reading research suggests that L1 orthographic experience influences L2 word recognition. Nevertheless, the findings on multi-syllabic words in English are still limited despite the fact that a vast majority of words are multi-syllabic. The study investigated whether L1 orthography influences the recognition of multi-syllabic words, focusing on the position of an embedded word. The participants were Arabic ESL learners, Chinese ESL learners, and native speakers of English. The task was a word search task, in which the participants identified a target word embedded in a pseudoword at the initial, middle, or final position...
March 21, 2017: Journal of Psycholinguistic Research
https://www.readbyqxmd.com/read/28323832/age-related-cognitive-decline-and-associations-with-sex-education-and-apolipoprotein-e-genotype-across-ethnocultural-groups-and-geographic-regions-a-collaborative-cohort-study
#3
Darren M Lipnicki, John D Crawford, Rajib Dutta, Anbupalam Thalamuthu, Nicole A Kochan, Gavin Andrews, M Fernanda Lima-Costa, Erico Castro-Costa, Carol Brayne, Fiona E Matthews, Blossom C M Stephan, Richard B Lipton, Mindy J Katz, Karen Ritchie, Jacqueline Scali, Marie-Laure Ancelin, Nikolaos Scarmeas, Mary Yannakoulia, Efthimios Dardiotis, Linda C W Lam, Candy H Y Wong, Ada W T Fung, Antonio Guaita, Roberta Vaccaro, Annalisa Davin, Ki Woong Kim, Ji Won Han, Tae Hui Kim, Kaarin J Anstey, Nicolas Cherbuin, Peter Butterworth, Marcia Scazufca, Shuzo Kumagai, Sanmei Chen, Kenji Narazaki, Tze Pin Ng, Qi Gao, Simone Reppermund, Henry Brodaty, Antonio Lobo, Raúl Lopez-Anton, Javier Santabárbara, Perminder S Sachdev
BACKGROUND: The prevalence of dementia varies around the world, potentially contributed to by international differences in rates of age-related cognitive decline. Our primary goal was to investigate how rates of age-related decline in cognitive test performance varied among international cohort studies of cognitive aging. We also determined the extent to which sex, educational attainment, and apolipoprotein E ε4 allele (APOE*4) carrier status were associated with decline. METHODS AND FINDINGS: We harmonized longitudinal data for 14 cohorts from 12 countries (Australia, Brazil, France, Greece, Hong Kong, Italy, Japan, Singapore, Spain, South Korea, United Kingdom, United States), for a total of 42,170 individuals aged 54-105 y (42% male), including 3...
March 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28323775/inadequate-antioxidative-responses-in-kidneys-of-brain-dead-rats
#4
Dane Hoeksma, Rolando A Rebolledo, Maximilia Hottenrott, Yves S Bodar, Janneke J Wiersema-Buist, Harry Van Goor, Henri G D Leuvenink
BACKGROUND: Brain death (BD)-related lipid peroxidation, measured as serum malondialdehyde (MDA) levels, correlates with delayed graft function in renal transplant recipients. How BD affects lipid peroxidation is not known. The extent of BD-induced organ damage is influenced by the speed at which intracranial pressure increases. To determine possible underlying causes of lipid peroxidation, we investigated the renal redox balance by assessing oxidative and antioxidative processes in kidneys of brain-dead rats after fast and slow BD induction...
April 2017: Transplantation
https://www.readbyqxmd.com/read/28323681/predictors-that-a-diagnosis-of-mild-cognitive-impairment-will-remain-stable-3-years-later
#5
Matthew A Clem, Ryan P Holliday, Seema Pandya, Linda S Hynan, Laura H Lacritz, Fu L Woon
BACKGROUND AND OBJECTIVE: In half to two thirds of patients who are diagnosed with mild cognitive impairment (MCI), the diagnosis neither converts to dementia nor reverts to normal cognition; however, little is known about predictors of MCI stability. Our study aimed to identify those predictors. METHODS: We obtained 3-year longitudinal data from the National Alzheimer's Coordinating Center Uniform Data Set for patients with a baseline diagnosis of MCI. To predict MCI stability, we used the patients' baseline data to conduct three logistic regression models: demographics, global function, and neuropsychological performance...
March 2017: Cognitive and Behavioral Neurology: Official Journal of the Society for Behavioral and Cognitive Neurology
https://www.readbyqxmd.com/read/28323637/accelerated-monte-carlo-simulation-on-the-chemical-stage-in-water-radiolysis-using-gpu
#6
Zhen Tian, Steve B Jiang, Xun Jia
The accurate simulation of water radiolysis is an important step to understand the mechanisms of radiobiology and quantitatively test some hypotheses regarding radiobiological effects. However, the simulation of water radiolysis is highly time consuming, taking hours or even days to be completed by a conventional CPU processor. This time limitation hinders cell-level simulations for a number of research studies. We recently initiated efforts to develop gMicroMC, a GPU-based fast microscopic MC simulation package for water radiolysis...
March 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28319706/fire-spread-predictions-sweeping-uncertainty-under-the-rug
#7
Akli Benali, Ana C L Sá, Ana R Ervilha, Ricardo M Trigo, Paulo M Fernandes, José M C Pereira
Predicting fire spread and behavior correctly is crucial to minimize the dramatic consequences of wildfires. However, our capability of accurately predicting fire spread is still very limited, undermining the utility of such simulations to support decision-making. Improving fire spread predictions for fire management purposes, by using higher quality input data or enhanced models, can be expensive, unfeasible or even impossible. Fire managers would benefit from fast and inexpensive ways of improving their decision-making...
March 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28319401/using-sound-to-study-the-effect-of-frothers-on-the-break-away-of-air-bubbles-at-an-underwater-capillary
#8
Pengbo Chu, Randolph Pax, Ronghao Li, Ray Langlois, James Andrew Finch
Frothers, a class of surfactants, are widely employed in froth flotation to aid the generation of small bubbles. Their action is commonly explained by their ability to hinder coalescence. There are occasional references suggesting that frother may also play a role in the initial break-up of the injected air mass. This work investigates the possible effect of frother on break-up by monitoring air bubbles produced quasi-statically at an underwater capillary. Under this condition, break-up is isolated from coalescence, and an impact of frothers on the detached bubble can be ascribed to an impact on break-up...
March 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28319380/evaluation-and-characterization-of-trk-kinase-inhibitors-for-the-treatment-of-pain-reliable-binding-affinity-predictions-from-theory-and-computation
#9
Shunzhou Wan, Agastya P Bhati, Sarah Skerratt, Kiyoyuki Omoto, Veerabahu Shanmugasundaram, Sharan K Bagal, Peter Vivian Coveney
Optimisation of ligand binding affinity to the target protein of interest is a primary objective in small-molecule drug discovery. Until now, the prediction of binding affinities by computational methods has not been widely applied in the drug discovery process, mainly due to its lack of accuracy and reproducibility, as well as the long turnaround times required to obtain results. Herein, we report on a collaborative study that compares tropomyosin receptor kinase A (TrkA) binding affinity predictions using two recently formulated fast computational approaches - namely ESMACS (Enhanced Sampling of Molecular dynamics with Approximation of Continuum Solvent) and TIES (Thermodynamic Integration with Enhanced Sampling) - to experimentally derived TrkA binding affinities for a set of Pfizer pan-Trk compounds...
March 20, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28319003/insulin-resistance-and-cognitive-performance-in-type-2-diabetes-the-maastricht-study
#10
Stefan L C Geijselaers, Simone J S Sep, Miranda T Schram, Martin P J van Boxtel, Ronald M A Henry, Frans R J Verhey, Abraham A Kroon, Nicolaas C Schaper, Pieter C Dagnelie, Carla J H van der Kallen, Coen D A Stehouwer, Geert Jan Biessels
AIMS: Type 2 diabetes, hyperinsulinemia, and insulin resistance are associated with cognitive impairment. Experimental studies indicate that insulin signaling in the brain is related to cognitive performance. Here we evaluated whether insulin-related variables contribute to the variance in cognitive performance among individuals with type 2 diabetes. METHODS: A total of 806 individuals with type 2 diabetes (mean age 62±8years, HbA1c 6.9±1.1%) completed a neuropsychological test battery...
February 12, 2017: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/28318603/rupture-risk-in-abdominal-aortic-aneurysms-a-realistic-assessment-of-the-explicit-gpu-approach
#11
V Strbac, D M Pierce, B Rodriguez-Vila, J Vander Sloten, N Famaey
Accurate estimation of peak wall stress (PWS) is the crux of biomechanically motivated rupture risk assessment for abdominal aortic aneurysms aimed to improve clinical outcomes. Such assessments often use the finite element (FE) method to obtain PWS, albeit at a high computational cost, motivating simplifications in material or element formulations. These simplifications, while useful, come at a cost of reliability and accuracy. We achieve research-standard accuracy and maintain clinically applicable speeds by using novel computational technologies...
February 27, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28318285/reading-through-the-life-span-individual-differences-in-psycholinguistic-effects
#12
Rob A I Davies, Ruth Arnell, Julia M H Birchenough, Debbie Grimmond, Sam Houlson
The effects of psycholinguistic variables are critical to the evaluation of theories about the cognitive reading system. However, reading research has tended to focus on the impact of key variables on average performance. We report the first investigation examining variation in psycholinguistic effects across the life span, from childhood into old age. We analyzed the performance of a sample of 535 readers, aged 8-83 years in lexical decision and pronunciation tasks. Our findings show that the effects on reading of two key variables, frequency and AoA, decrease in size with increasing age over the life span...
March 20, 2017: Journal of Experimental Psychology. Learning, Memory, and Cognition
https://www.readbyqxmd.com/read/28318232/histology-compatible-maldi-mass-spectrometry-based-imaging-of-neuronal-lipids-for-subsequent-immunofluorescent-staining
#13
Ibrahim Kaya, Wojciech Michno, Dimitri Brinet, Yasmine Iacone, Giulia Zanni, Kaj Blennow, Henrik Zetterberg, Jörg Hanrieder
Matrix assisted laser desorption/ionization imaging mass spectrometry (MALDI-IMS) enables acquisition of spatial distribution maps for molecular species in situ. This can provide comprehensive insights on the pathophysiology of different diseases. However, current sample preparation and MALDI-IMS acquisition methods have limitations in preserving molecular and histological tissue morphology, resulting in interfered correspondence of MALDI-IMS data with subsequently acquired immunofluorescent staining results...
March 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28316258/walking-football-as-sustainable-exercise-for-older-adults-a-pilot-investigation
#14
Peter Reddy, Irundika Dias, Carol Holland, Niyah Campbell, Iaysha Nagar, Luke Connolly, Peter Krustrup, Harry Hubball
The health benefits of playing football and the importance of exercise and social contact for healthy ageing are well established, but few older adults in the UK take enough exercise. Football is popular, flexible in format and draws players into engrossing, effortful and social exercise, but the physical demands of play at full speed may make it unsustainable for some older adults. Restricted to walking pace, will play still be engaging? Will health benefits be retained? Will physical demands remain manageable? This pilot study aims to investigate: (1) the experience of older adults playing walking football every week, is it sustainable and rewarding, (2) the intensity and locomotor pattern of walking football, (3) the scale and nature of walking football health benefits and (4) possible cognitive benefits of playing walking football through measures of processing speed, selective and divided attention and updating and inhibition components of executive function...
March 19, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28316162/-observation-on-the-clinical-application-effects-of-skin-distractor-on-the-treatment-of-scars
#15
W L Gui, E Yang, H S Zhang
Objective: To explore clinical application effects of skin distractor on the treatment of scars and to observe effects of skin distractor with different pull speeds on different parts scars of human body. Methods: One hundred and four patients with scars, conforming to the study criteria, were hospitalized in our unit from January 2014 to June 2015. Patients were divided into 2 mm/d group and 4 mm/d group according to the random number table, with 52 patients in each group. After admission, skin distractors were pasted on scars in face and neck, trunk, and extremities of patients in 2 groups, with inner edges of pasteboards close to outside edges of longer sides of scars...
March 20, 2017: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/28315594/goal-neglect-fluid-intelligence-and-processing-speed-manipulating-instruction-load-and-inter-stimulus-interval
#16
Matthew H Iveson, Sergio Della Sala, Mike Anderson, Sarah E MacPherson
Goal maintenance is the process where task rules and instructions are kept active to exert their control on behavior. When this process fails, an individual may ignore a rule while performing the task, despite being able to describe it after task completion. Previous research has suggested that the goal maintenance system is limited by the number of concurrent rules which can be maintained during a task, and that this limit is dependent on an individual's level of fluid intelligence. However, the speed at which an individual can process information may also limit their ability to use task rules when the task demands them...
March 15, 2017: Acta Psychologica
https://www.readbyqxmd.com/read/28314375/inter-subject-variability-of-axonal-injury-in-diffuse-traumatic-brain-injury
#17
Jeffrey B Ware, Tessa Hart, John Whyte, Amanda Rabinowitz, John A Detre, Junghoon Kim
Traumatic brain injury (TBI) is a leading cause of cognitive morbidity worldwide, for which reliable biomarkers are needed. Diffusion tensor imaging (DTI) is a promising biomarker of traumatic axonal injury (TAI), however existing studies have been limited by a primary reliance upon group-level analytic methods not well-suited to account for inter-subject variability. In this study, 42 adults with TBI of at least moderate severity were examined 3 months following injury and compared to 35 healthy controls. DTI data was used for both traditional group-level comparison as well as subject-specific analysis using the distribution-corrected Z-score (DisCo-Z) approach...
March 17, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28306245/3d-printed-high-density-droplet-array-chip-for-miniaturized-protein-crystallization-screening-under-vapor-diffusion-mode
#18
Yi-Ran Liang, Li-Na Zhu, Jie Gao, Hong-Xia Zhao, Ying Zhu, Sheng Ye, Qun Fang
Here we describe the combination of three-dimensional (3D) printed chip and automated microfluidic droplet-based screening techniques for achieving massively parallel, nanoliter-scale protein crystallization screening under vapor diffusion mode. We fabricated high density microwell array chips for sitting-drop vapor diffusion crystallization utilizing the advantage of 3D printing technique in producing high-aspect-ratio chips. To overcome the obstacle of 3D printed microchips in performing long-term reactions caused by their porousness and gas permeability properties in chip body, we developed a two-step post processing method, including paraffin filling and parylene coating, to achieve high sealability and stability...
March 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28304305/combined-dual-task-gait-training-and%C3%A2-aerobic-exercise-to-improve-cognition-%C3%A2-mobility-and%C3%A2-vascular-health-in%C3%A2-community-dwelling-older-adults-at%C3%A2-risk-for-future-cognitive-decline1
#19
Michael A Gregory, Narlon C Boa Sorte Silva, Dawn P Gill, Cheri L McGowan, Teresa Liu-Ambrose, J Kevin Shoemaker, Vladimir Hachinski, Jeff Holmes, Robert J Petrella
This 6-month experimental case series study investigated the effects of a dual-task gait training and aerobic exercise intervention on cognition, mobility, and cardiovascular health in community-dwelling older adults without dementia. Participants exercised 40 min/day, 3 days/week for 26 weeks on a Biodex GaitTrainer2 treadmill. Participants were assessed at baseline (V0), interim (V1: 12-weeks), intervention endpoint (V2: 26-weeks), and study endpoint (V3: 52-weeks). The study outcomes included: cognition [executive function (EF), processing speed, verbal fluency, and memory]; mobility: usual & dual-task gait (speed, step length, and stride time variability); and vascular health: ambulatory blood pressure, carotid arterial compliance, and intima-media thickness (cIMT)...
March 10, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28304290/the-efficacy-of-emotion-recognition-rehabilitation-for-people-with-alzheimer-s%C3%A2-disease
#20
J Antonio García-Casal, Miguel Goñi-Imizcoz, M Victoria Perea-Bartolomé, Felipe Soto-Pérez, Sarah Jane Smith, Sara Calvo-Simal, Manuel Franco-Martín
BACKGROUND: The ability to recognize emotional expression is essential for social interactions, adapting to the environment and quality of life. Emotion recognition is impaired in people with Alzheimer's disease (AD), thus rehabilitation of these skills has the potential to elicit significant benefits. OBJECTIVE: This study sought to establish whether emotion recognition capacity could be rehabilitated in people with AD. METHODS: Thirty-six participants with AD were assigned to one of three conditions: an experimental group (EG) that received 20 sessions of rehabilitation of emotion recognition and 20 sessions of cognitive stimulation therapy (CST), a control group (CG) that received 40 sessions of CST, and a treatment as usual group (TAU)...
March 10, 2017: Journal of Alzheimer's Disease: JAD
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