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Results 401 - 450 of 1359
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Lin Shyh-Tsong - - 2011
A calibrator utilizing a low-coherent light source straightness interferometer and a compensation method is introduced for straightness measurements in this paper. Where the interference pattern, which is modulated by an envelope function, generated by the interferometer undergoes a shifting as the Wolaston prism of the interferometer experiences a lateral displacement, ...
Kirmani Ahmed - - 2011
Range acquisition systems such as light detection and ranging (LIDAR) and time-of-flight (TOF) cameras operate by measuring the time difference of arrival between a transmitted pulse and the scene reflection. We introduce the design of a range acquisition system for acquiring depth maps of piecewise-planar scenes with high spatial resolution ...
Tao Hu - - 2011
We have designed, fabricated, and characterized metamaterial enhanced bimaterial cantilever pixels for far-infrared detection. Local heating due to absorption from split ring resonators (SRRs) incorporated directly onto the cantilever pixels leads to mechanical deflection which is readily detected with visible light. Highly responsive pixels have been fabricated for detection at ...
Liem Franziskus - - 2011
Sparse and clustered-sparse temporal sampling fMRI protocols have been devised to reduce the influence of auditory scanner noise in the context of auditory fMRI studies. Here, we report an improvement of the previously established clustered-sparse acquisition scheme. The standard procedure currently used by many researchers in the field is a ...
Woods Adam J AJ Department of Neurology, University of Pennsylvania, Philadelphia, PA 19104, USA. - - 2012
The relationship between arousal, perception, and visual neglect was examined in this case study. Cold pressor stimulation (CPS: immersing the foot in iced water) was used to manipulate arousal and to determine its effects on contralesional neglect, perception of stimulus intensity (magnitude estimation), reaction time, and an electrophysiological correlate of ...
Posatskiy A O - - 2011
Mechanomyography (MMG) is an important kinesiological tool and potential communication pathway for individuals with disabilities. However, MMG is highly susceptible to contamination by motion artifact due to limb movement. A better understanding of the nature of this contamination and its effects on different sensing methods is required to inform robust ...
Sayers Mark G L - - 2011
Objectives: The aim of this study was to evaluate changes in the three dimensional lower limb kinematics during a simulated cycling time trial. Design: Repeated measures. Methods: Ten experienced male road cyclists performed a 60min cycling test at a workload based on previous onset of blood lactate accumulation (OBLA) testing. ...
Wilke Marko - - 2011
Motion is a significant problem for the analysis of functional MRI data. This manuscript addresses the question of whether an individualized assessment of motion may be informative, and whether it may be beneficial with regard to explaining motion-related variance. Two independent datasets are used to explore and test this hypothesis, ...
Subotić Miško - - 2012
Transient otoacoustic emission (TEOAE) is a method widely used in clinical practice for assessment of hearing quality. The main problem in TEOAE detection is its much lower level than the level of environmental and biological noise. While the environmental noise level can be controlled, the biological noise can be only ...
Dutta Tilak - - 2011
Recording posture and movement is important for determining risk of musculoskeletal injury in the workplace, but existing motion capture systems are not suited for field work. Estimates of the 3-D relative positions of four 0.10m cubes from the Kinect were compared to estimates from a Vicon motion capture system to ...
Kobayashi Toshiki - - 2011
Background and Aim: Ankle joint stiffness and its range of motion (ROM) are commonly assessed to determine the appropriate mechanical characteristics required in an effective ankle-foot orthosis (AFO) prescription. The aim of this technical note is to present the design of a manual device that enables their convenient measurement in ...
Brodsky James W - - 2011
Background:There is a resurgence of popularity with regard to total ankle arthroplasty, although there are limited data documenting the effect of total ankle arthroplasty on ankle joint motion, gait, or ankle function. The purpose of this study was to perform a prospective evaluation of the effect of the Scandinavian Total ...
Al-Hashmi Amal M AM McGill Vision Research, Department of Ophthalmology H4.14, McGill University, 687 Pine Ave West, Montreal, QC, H3A 1A1, - - 2011
Achromatic visual function in primates is distributed between two pathways from retina to cortex, the parvocellular and the magnocellular. The relative contribution of these to human achromatic vision is controversial and largely unknown. Here, we use an optic neuritis (ON) model to investigate the effects of a severe loss of ...
Canolty Ryan T RT Department of Electrical Engineering and Computer Sciences and the Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA 94720, USA. - - 2012
Phase-amplitude cross-frequency coupling (CFC)-where the phase of a low-frequency signal modulates the amplitude or power of a high-frequency signal-is a topic of increasing interest in neuroscience. However, existing methods of assessing CFC are inherently bivariate and cannot estimate CFC between more than two signals at a time. Given the increase ...
Rajapaksa I - - 2011
The Raman effect is typically observed by irradiating a sample with an intense light source and detecting the minute amount of frequency shifted scattered light. We demonstrate that Raman molecular vibrational resonances can be detected directly through an entirely different mechanism-namely, a force measurement. We create a force interaction through ...
Oja Vello - - 2011
This report describes a new method to measure the chloroplastic lumenal proton pool in leaves (tobacco and sunflower). The method is based on measurement of CO(2) outbursts from leaves caused by the shift in the CO(2) + H(2)O ↔ HCO(3) (-) + H(+) equilibrium in the chloroplast stroma as protons return from the lumen after darkening. ...
Azadpour Mahan M Audiology & Deafness Research Group, School of Psychological Sciences, University of Manchester, Manchester, M13 9PL, UK. - - 2012
A novel psychophysical method was developed for assessing spatial resolution in cochlear implants. Spectrally flat and spectrally peaked pulse train stimuli were generated by interleaving pulses on 11 electrodes. Spectrally flat stimuli used loudness-balanced currents and the spectrally peaked stimuli had a single spatial ripple with the current of the ...
Lichtenhan Jeffery T JT Massachusetts Eye & Ear Infirmary, Eaton-Peabody Laboratory of Auditory Physiology, Boston, MA 02114, USA. - - 2012
Stimulus-frequency otoacoustic emissions (SFOAEs) have been used to study a variety of topics in cochlear mechanics, although a current topic of debate is where in the cochlea these emissions are generated. One hypothesis is that SFOAE generation is predominately near the peak region of the traveling wave. An opposing hypothesis ...
Qin Shouxuan - - 2011
The light transmission fluctuation method is a simple and useful method for in situ and in-line measurement of particle size and concentration. To accomplish the measurement, it is necessary to know the intensity of incident light or background signal I<sub>0</sub>. However, measuring I<sub>0</sub> during in-line applications is hard. In this ...
Power Jonathan D JD Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA. - - 2012
Here, we demonstrate that subject motion produces substantial changes in the timecourses of resting state functional connectivity MRI (rs-fcMRI) data despite compensatory spatial registration and regression of motion estimates from the data. These changes cause systematic but spurious correlation structures throughout the brain. Specifically, many long-distance correlations are decreased by ...
Choi J-I - - 2012
A large-eddy simulation is used to investigate contaminant transport owing to complex human and door motions and vent-system activity in room compartments where a contaminated and clean room are connected by a vestibule. Human and door motions are simulated with an immersed boundary procedure. We demonstrate the details of contaminant ...
Sokolov Arseny A - - 2011
The cerebellum is thought to be engaged not only in motor control, but also in the neural network dedicated to visual processing of body motion. However, the pattern of connectivity within this network, in particular, between the cortical circuitry for observation of others' actions and the cerebellum remains largely unknown. ...
Turner Joe - - 2011
Wind has previously been shown to influence the location and orientation of spider web sites and also the geometry and material composition of constructed orb webs. We now show that wind also influences components of prey-catching behaviour within the web. A small wind tunnel was used to generate different wind ...
Rushworth Cathy M - - 2011
Fibre-loop cavity ringdown spectroscopy (CRDS) is a highly sensitive spectroscopic absorption technique which has shown considerable promise for the analysis of small-volume liquid samples. We have developed a new light coupling method for fibre-loop CRDS, which overcomes two disadvantages of the technique; namely, low efficiency light coupling into the cavity, ...
Ball Kevin A - - 2011
Abstract Kicking with the non-preferred leg is important in Australian Football and becoming important in the rugby codes. The aim of this study was to examine differences between preferred and non-preferred leg kicking in the drop punt kick. Seventeen elite Australian Football players performed kicks with the preferred and non-preferred ...
Gall Megan D - - 2011
Studies of auditory temporal resolution in birds have traditionally examined processing capabilities by assessing behavioral discrimination of sounds varying in temporal structure. Here, temporal resolution of the brown-headed cowbird (Molothrus ater) was measured using two auditory evoked potential (AEP)-based methods: auditory brainstem responses (ABRs) to paired clicks and envelope following ...
West Daniel J - - 2011
West, DJ, Owen, NJ, Jones, MR, Bracken, RM, Cook, CJ, Cunningham, DJ, Shearer, DA, Finn, CV, Newton, RU, Crewther, BT, and Kilduff, LP. Relationships between force-time characteristics of the isometric midthigh pull and dynamic performance in professional rugby league players. J Strength Cond Res 25(11): 3070-3075, 2011-There is considerable conflict ...
Carneiro Leticia Calado - - 2011
The aim of this study was to compare the first and second peaks of the vertical ground reaction force (VGRF) and kinematics at initial contact (IC) and final stance (FS) during walking in one of two directions (forward×backward) and two environments (on land×underwater). Twenty-two adults (24.6±2.6 years) walking forward (FW) ...
Nagy Gergely - - 2011
Diatoms possess effective photoprotection mechanisms, which may involve reorganizations in the photosynthetic machinery. We have shown earlier, by using circular dichroism (CD) spectroscopy, that in Phaeodactylum tricornutum the pigment-protein complexes are arranged into chiral macrodomains, which have been proposed to be associated with the multilamellar organization of the thylakoid membranes ...
Li Xiaowei - - 2011
Plasmonic nanosensors are promising for chip-based refractometric detections, most of which are based on spectroscopic monitoring of surface plasmon resonance. Here, we propose a simple non-spectroscopic refractometric sensing scheme based on a plasmonic interferometer integrating a metallic groove array and a tilted nanoslit. Owing to the interference of the directly ...
Dennis Tasshi - - 2011
We demonstrate a high-accuracy heterodyne measurement system for characterizing the magnitude of the frequency response of high-speed 1.55 µm photoreceivers from 2 MHz to greater than 50 GHz. At measurement frequencies below 2 GHz, we employ a phase-locked loop with a double-heterodyne detection scheme, which enables precise tuning of the ...
Ravikumar Sowmya S Vision Science Program, University of California Berkeley, California 94720, - - 2011
Focus cues are incorrect in conventional stereoscopic displays. This causes a dissociation of vergence and accommodation, which leads to visual fatigue and perceptual distortions. Multi-plane displays can minimize these problems by creating nearly correct focus cues. But to create the appearance of continuous depth in a multi-plane display, one needs ...
Correa de Sa Daniel D - - 2011
BACKGROUND: -Fractionated electrograms are used by some as targets for ablation in atrial and ventricular arrhythmias. Fractionation has been demonstrated to result when there is repetitive or asynchronous activation of separate groups of cells within the recording region of a mapping electrode(s). METHODS AND RESULTS: -Using a computer model we ...
Sheets Alison L - - 2011
Tennis injuries have been associated with serving mechanics, but quantitative kinematic measurements in realistic environments are limited by current motion capture technologies. This study tested for kinematic differences at the lower back, shoulder, elbow, wrist, and racquet between the flat, kick, and slice serves using a markerless motion capture (MMC) ...
Kipp Kristof - - 2011
The purpose of this study was to investigate correlations between biomechanical outcome measures and weightlifting performance. Joint kinematics and kinetics of the hip, knee, and ankle were calculated while ten subjects performed a clean at 85% of 1-RM. Kinematic and kinetic time-series patterns were extracted with principal components analysis. Discrete ...
Sandel B - - 2011
The effects of climate change on biodiversity should depend in part on climate displacement rate (climate-change velocity) and its interaction with species' capacity to migrate. We estimated Late Quaternary glacial-interglacial climate-change velocity by integrating macroclimatic shifts since the Last Glacial Maximum with topoclimatic gradients. Globally, areas with high velocities were ...
Gatt Alfred - - 2011
Background: Measurement of ankle joint dorsiflexion is an essential examination technique that needs to be performed prior to prescription of foot orthoses since the presence or absence of ankle equinus will affect the design of such devices. The purpose of this study was to investigate the effect of foot posture ...
Wang Yadong - - 2012
Slow acoustic modulations below 20 Hz, of varying bandwidths, are dominant components of speech and many other natural sounds. The dynamic neural representations of these modulations are difficult to study through noninvasive neural-recording methods, however, because of the omnipresent background of slow neural oscillations throughout the brain. We recorded the ...
Liu Xiaomin - - 2011
The concentration quenching threshold of upconversion luminescence was broken through for the first time via a designed strategy: spatial separation of the emitter doping area.
Fong Yan Alycia - - 2011
There has been little scientific investigation of the impact of dance shoes on foot motion or dance injuries. The pointed (plantarflexed) foot is a fundamental component of both the technical requirements and the traditional aesthetic of ballet and jazz dancing. The aims of this study were to quantify the externally ...
Magliano Joseph P JP Department of Psychology, Northern Illinois University, DeKalb, IL 60115, USA. - - 2011
Filmmakers use continuity editing to engender a sense of situational continuity or discontinuity at editing boundaries. The goal of this study was to assess the impact of continuity editing on how people perceive the structure of events in a narrative film and to identify brain networks that are associated with ...
Alcock A - - 2011
Initial ball flight characteristics of curve and instep kicks were investigated. Fifteen international female footballers performed curve and instep kicks from a distance of 20 m from goal and at a 1 m2 target. Seventeen Vicon cameras tracked three-dimensional coordinates of four reflective markers adhered to the ball. Ball flight ...
Rasetshwane Daniel M DM Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA. - - 2011
Recently, investigators of otoacoustic emissions (OAEs) have shown interest in measuring OAEs to frequencies higher than 10 kHz. Most commercial instruments used to measure OAEs do not specify the microphone frequency response at higher frequencies, nor does their typically integrated design make it convenient to measure it. OAE probes manufactured ...
Fabiani Marco - - 2011
The effect of variations in pitch, loudness, and timbre on the perception of the dynamics of isolated instrumental tones is investigated. A full factorial design was used in a listening experiment. The subjects were asked to indicate the perceived dynamics of each stimulus on a scale from pianissimo to fortissimo. ...
Locascio James V - - 2011
A four hydrophone linear array was used to localize calling black drum and estimate source levels and signal propagation. A total of 1025 source level estimates averaged 165 dB(RMS) relative (re:) 1 μPa (standard deviation (SD) = 1.0). The authors suggest that the diverticulated morphology of the black drum swimbladder increase the ...
Langguth Julie - - 2011
This study determines whether a small excision of the tongue, due to removal of a lateral T1 tumor, will cause a change in tongue motion patterns during speech. Principal components analysis (PCA) compared the motion patterns of ten control subjects to those of three glossectomy patients. The patients were 7-39 ...
Nijland Rinske - - 2011
Abstract Constraint-induced movement therapy is a commonly used intervention to improve upper limb function after stroke. However, the effectiveness of constraint-induced movement therapy and its optimal dosage during acute or sub-acute stroke is still under debate. To examine the literature on the effects of constraint-induced movement therapy in acute or ...
Pilkar Rakesh - - 2011
Bursts of 2.5mm horizontal sinusoidal anterior-posterior oscillations of sequentially varying frequencies (0.25 to 1.25 Hz) are applied to the base of support to study postural control. The Empirical Mode Decomposition (EMD) algorithm decomposes the Center of Pressure (CoP) data (5 young, 4 mature adults) into Intrinsic Mode Functions (IMFs). Hilbert ...
Sullivan Sarah C - - 2011
This experiment examined the ability of human listeners to categorize sounds as a function of changing training distribution characteristics. Participants were presented non-speech sounds randomly sampled from two overlapping, Gaussian-like distributions. The sounds consisted of narrow-band noise bursts varying in center frequency. Participants mapped the distributions of sounds onto creatures ...
Liu Chang - - 2011
Thresholds of vowel formant discrimination for F1 and F2 of isolated vowels with full and partial vowel spectra were measured for normal-hearing listeners at fixed and roving speech levels. Performance of formant discrimination was significantly better for fixed levels than for roving levels with both full and partial spectra. The ...
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