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https://www.readbyqxmd.com/read/28806193/speech-perception-in-noise-and-listening-effort-of-older-adults-with-nonlinear-frequency-compression-hearing-aids
#1
James Shehorn, Nicole Marrone, Thomas Muller
OBJECTIVES: The purpose of this laboratory-based study was to compare the efficacy of two hearing aid fittings with and without nonlinear frequency compression, implemented within commercially available hearing aids. Previous research regarding the utility of nonlinear frequency compression has revealed conflicting results for speech recognition, marked by high individual variability. Individual differences in auditory function and cognitive abilities, specifically hearing loss slope and working memory, may contribute to aided performance...
August 10, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28801202/a-biomechanical-study-comparing-proximal-femur-nail-and-proximal-femur-locking-compression-plate-in-fixation-of-reverse-oblique-proximal-femur-fractures
#2
Ashutosh Kumar Singh, N Narsaria, R K Gupta
BACKGROUND: The reverse oblique trochanteric fractures are common fractures and its treatment poses a challenge. The purpose of this study was to compare the biomechanical parameters of the construct using proximal femoral nail (PFN) and proximal femoral locking compression plates (PFLCP) in these fractures using cadaveric specimens. MATERIALS AND METHODS: Twenty freshly harvested cadaveric femoral specimens were randomly assigned to two groups after measuring bone mineral density, ten of which were implanted with PFN and the other ten with PFLCP...
May 22, 2017: Injury
https://www.readbyqxmd.com/read/28798850/network-simulation-based-optimization-of-centrifugo-pneumatic-blood-plasma-separation
#3
S Zehnle, M Rombach, R Zengerle, F von Stetten, N Paust
Automated and robust separation of 14 μl of plasma from 40 μl of whole blood at a purity of 99.81% ± 0.11% within 43 s is demonstrated for the hematocrit range of 20%-60% in a centrifugal microfluidic polymer disk. At high rotational frequency, red blood cells (RBCs) within whole blood are concentrated in a radial outer RBC collection chamber. Simultaneously, plasma is concentrated in a radial inner pneumatic chamber, where a defined air volume is enclosed and compressed. Subsequent reduction of the rotational frequency to not lower than 25 Hz enables rapid transfer of supernatant plasma into a plasma collection chamber, with highly suppressed resuspension of red blood cells...
March 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28796806/an-analysis-of-the-influence-of-deep-neural-network-dnn-topology-in-bottleneck-feature-based-language-recognition
#4
Alicia Lozano-Diez, Ruben Zazo, Doroteo T Toledano, Joaquin Gonzalez-Rodriguez
Language recognition systems based on bottleneck features have recently become the state-of-the-art in this research field, showing its success in the last Language Recognition Evaluation (LRE 2015) organized by NIST (U.S. National Institute of Standards and Technology). This type of system is based on a deep neural network (DNN) trained to discriminate between phonetic units, i.e. trained for the task of automatic speech recognition (ASR). This DNN aims to compress information in one of its layers, known as bottleneck (BN) layer, which is used to obtain a new frame representation of the audio signal...
2017: PloS One
https://www.readbyqxmd.com/read/28796094/patulous-eustachian-tube-dysfunction-patient-demographics-and-comorbidities
#5
Bryan K Ward, Yehia Ashry, Dennis S Poe
OBJECTIVE: The objective is to describe a large cohort of patients presenting with patulous Eustachian tube (pET) dysfunction. STUDY DESIGN: Retrospective patient series. SETTING: Tertiary referral center. PATIENTS: All outpatient visits (2004-2016) that were assigned ICD9 code (381.7-Patulous Eustachian tube) were screened. Only patients with observed tympanic membrane movements during ipsilateral nasal breathing or acoustic reflex decay testing demonstrating transmitted nasal breathing were included (n = 190, n = 239 ears)...
August 8, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28795555/chemical-imaging-of-self-assembled-monolayers-on-copper-using-compressive-hyperspectral-sum-frequency-generation-microscopy
#6
Desheng Zheng, Liyang Lu, Kevin F Kelly, Steven Baldelli
Sum frequency generation microscopy is a label-free optical imaging technique with intrinsic molecular vibrational contrast for surface studies. Recent developments of compressive sensing broad-band hyperspectral SFG microscopy have demonstrated the potential application for imaging monolayer at metal surfaces with micrometer spatial resolution. Here is presented the capability of chemical imaging of spatially patterned monolayers of 1-octadecanethiol (ODT) and 16-methoxy-1-hexadecanethiol (MeOHT) molecules assembled on a copper surface...
August 10, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28782722/influence-of-dynamic-compressive-loading-on-the-in-vitro-degradation-behavior-of-pure-pla-and-mg-pla-composite
#7
Xuan Li, Chenxi Qi, Linyuan Han, Chenglin Chu, Jing Bai, Chao Guo, Feng Xue, Baolong Shen, Paul K Chu
The effects of dynamic compressive loading on the in vitro degradation behavior of pure poly-lactic acid (PLA) and PLA-based composite unidirectionally reinforced with micro-arc oxidized magnesium alloy wires (Mg/PLA) are investigated. Dynamic compressive loading is shown to accelerate degradation of pure PLA and Mg/PLA. As the applied stress is increased from 0.1 MPa to 0.9 MPa or frequency from 0.5 Hz to 2.5 Hz, the overall degradation rate goes up. After immersion for 21 days at 0.9 MPa and 2.5 Hz, the bending strength retention of the composite and pure PLA is 60...
August 4, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28777744/the-effect-of-wing-flexibility-on-sound-generation-of-flapping-wings
#8
Biao Geng, Qian Xue, Xudong Zheng, Geng Liu, Yan Ren, Haibo Dong
In this study, the unsteady flow and acoustic characteristics of a three-dimensional (3D) flapping wing model of Tibicen linnei cicada at forward flight condition are numerically investigated. A single cicada wing is modelled as a membrane with prescribed motion reconstructed from high-speed videos of a live insect. The numerical solution takes a hydrodynamic/acoustic splitting approach: the flow field is solved with an incompressible Navier-Stokes flow solver based on immersed boundary method and the acoustic field is solved with linearized perturbed compressible equations (LPCEs)...
August 4, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28774473/hyperinflation-of-the-left-anterior-basal-segment-a-new-sign-of-pectus-excavatum-severity-on-ct
#9
S Singh, S B Greenberg
AIM: To describe a new finding in patients with pectus excavatum - left lower lobe anterior basal segment hyperinflation [LABSH]. A secondary objective is to determine the frequency of the new finding and association with pectus excavatum severity. MATERIAL AND METHODS: The study population included 52 children who underwent preoperative computed tomography (CT) for the evaluation of pectus excavatum. A control group of 50 children was obtained after evaluating 137 CT examinations performed for other reasons...
July 31, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28774119/effects-of-perforation-on-rigid-pu-foam-plates-acoustic-and-mechanical-properties
#10
Jia-Horng Lin, Yu-Chun Chuang, Ting-Ting Li, Chen-Hung Huang, Chien-Lin Huang, Yueh-Sheng Chen, Ching-Wen Lou
Factories today are equipped with diverse mechanical equipment in response to rapid technological and industrial developments. Industrial areas located near residential neighborhoods cause massive environmental problems. In particular, noise pollution results in physical and psychological discomfort, and is a seen as invisible and inevitable problem. Thus, noise reduction is a critical and urgent matter. In this study, rigid polyurethane (PU) foam plates undergo perforation using a tapping machine. The mechanical and acoustic properties of these perforated plates as related to perforation rate and perforation depth are evaluated in terms of compression strength, drop-weight impact strength, and sound absorption coefficient...
December 9, 2016: Materials
https://www.readbyqxmd.com/read/28773123/probabilistic-flexural-fatigue-in-plain-and-fiber-reinforced-concrete
#11
José D Ríos, Héctor Cifuentes, Rena C Yu, Gonzalo Ruiz
The objective of this work is two-fold. First, we attempt to fit the experimental data on the flexural fatigue of plain and fiber-reinforced concrete with a probabilistic model (Saucedo, Yu, Medeiros, Zhang and Ruiz, Int. J. Fatigue, 2013, 48, 308-318). This model was validated for compressive fatigue at various loading frequencies, but not for flexural fatigue. Since the model is probabilistic, it is not necessarily related to the specific mechanism of fatigue damage, but rather generically explains the fatigue distribution in concrete (plain or reinforced with fibers) for damage under compression, tension or flexion...
July 7, 2017: Materials
https://www.readbyqxmd.com/read/28768317/hue-shifts-produced-by-temporal-asymmetries-in-chromatic-signals
#12
Andrew Stockman, G Bruce Henning, Peter West, Andrew T Rider, Hannah E Smithson, Caterina Ripamonti
Observers viewed M- or L-cone-isolating stimuli and compared slowly-on and slowly-off sawtooth waveforms of the same mean chromaticity and luminance. Between 6 and 13 Hz, the mean hue of slowly-on L-cone and slowly-off M-cone sawtooth flicker appeared redder, and the mean hue of slowly-off L-cone and slowly-on M-cone sawtooth stimuli appeared greener-despite all the waveforms' having the same mean, near-yellow-appearing chromaticity. We measured the effect of the modulation depth and the slope of the sawtooth on the mean hue shifts as a function of temporal frequency...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28767636/comparison-of-symptoms-from-c6-and-c7-radiculopathy
#13
James Rainville, Andrew A Joyce, Eric Laxer, Enrique Pena, David Kim, R Alden Milam, Eric Carkner
STUDY DESIGN: Case series. OBJECTIVE: This study compared the locations of arm pain, sensory symptoms, and subjective complaints of arm weakness in subjects with cervical radiculopathy from MRI confirmed C6 and C7 nerve root compression. SUMMARY OF BACKGROUND DATA: Cervical radiculopathy is defined as arm pain, sensory and motor symptoms caused by irritation of a cervical nerve root. The C6 and C7 roots are most commonly involved, and differentiating symptoms associated with each root has proven difficult...
August 1, 2017: Spine
https://www.readbyqxmd.com/read/28765657/-knowledge-and-willingness-to-perform-basic-life-support-by-local-police-officers
#14
P Angulo-Menéndez, A Lana Pérez, J Morís de la Tassa
BACKGROUND: To determine the knowledge and willingness of local police officers (PO) to perform cardiopulmonary resuscitation (CPR), as well as to explore the association between CPR training and these variables. METHODS: Cross-sectional study with a sample of 390 PO from Asturias (Spain). An anonymous questionnaire was used to measure nine basic aspects of CPR from the European Resuscitation Council and four indicators of attitude towards performing CPR in a real context...
July 28, 2017: Anales del Sistema Sanitario de Navarra
https://www.readbyqxmd.com/read/28764481/numerical-investigation-of-cavity-self-oscillation-and-noise-radiation-induced-by-turbulent-flow-at-non-zero-inclination-angle
#15
Yiping Wang, Chengqi Guo, Chengjian Peng, Chenguang Yu
A hybrid numerical approach was used on a three-dimensional cavity at a non-zero inclination angle of the upstream section to reveal the mechanism of self-oscillation and the characteristics of far-field sound field. In this hybrid approach, the unsteady flow physics was captured by a compressible large eddy simulation, and the far-field sound field was calculated by the FW-H integral equation, with the noise source provided by near-field calculation. The mechanism of self-oscillation was revealed based on the instantaneous flow field structure and the pressure inside the cavity...
July 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28764414/effect-of-the-static-compressive-load-on-vibration-propagation-in-multistory-buildings-and-resulting-heavyweight-floor-impact-sounds
#16
Yunsang Kwak, Sinyeob Lee, Jeongwon Park, Dukyoung Hwang, Jin Yong Jeon, Junhong Park
Experiments were performed to identify the mechanism of heavyweight floor impact sound transmission through floors in a high-rise apartment building. Vibration and sound levels on each floor of the multistory building were measured. The vibration generated at a given floor was transferred to multiple adjacent floors with decreasing amplitudes proportional to the distance from the excited floor. This vibration transfer introduced significant sound transmissions. The structural static load varied depending on the floor location due to differences in the weight of the structure above the floor, especially for wall construction buildings...
July 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28762243/quantitative-susceptibility-mapping-report-from-the-2016-reconstruction-challenge
#17
Christian Langkammer, Ferdinand Schweser, Karin Shmueli, Christian Kames, Xu Li, Li Guo, Carlos Milovic, Jinsuh Kim, Hongjiang Wei, Kristian Bredies, Sagar Buch, Yihao Guo, Zhe Liu, Jakob Meineke, Alexander Rauscher, José P Marques, Berkin Bilgic
PURPOSE: The aim of the 2016 quantitative susceptibility mapping (QSM) reconstruction challenge was to test the ability of various QSM algorithms to recover the underlying susceptibility from phase data faithfully. METHODS: Gradient-echo images of a healthy volunteer acquired at 3T in a single orientation with 1.06 mm isotropic resolution. A reference susceptibility map was provided, which was computed using the susceptibility tensor imaging algorithm on data acquired at 12 head orientations...
July 31, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28758963/a-miniaturized-qepas-trace-gas-sensor-with-a-3d-printed-acoustic-detection-module
#18
Xiaotao Yang, Youhong Xiao, Yufei Ma, Ying He, Frank K Tittel
A 3D printing technique was introduced to a quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor and is reported for the first time. The acoustic detection module (ADM) was designed and fabricated using the 3D printing technique and the ADM volume was compressed significantly. Furthermore, a small grin lens was used for laser focusing and facilitated the beam adjustment in the 3D-printed ADM. A quartz tuning fork (QTF) with a low resonance frequency of 30.72 kHz was used as the acoustic wave transducer and acetylene (C₂H₂) was chosen as the analyte...
July 31, 2017: Sensors
https://www.readbyqxmd.com/read/28748486/nonlinear-processing-of-a-multicomponent-communication-signal-by-combination-sensitive-neurons-in-the-anuran-inferior-colliculus
#19
Norman Lee, Katrina M Schrode, Mark A Bee
Diverse animals communicate using multicomponent signals. How a receiver's central nervous system integrates multiple signal components remains largely unknown. We investigated how female green treefrogs (Hyla cinerea) integrate the multiple spectral components present in male advertisement calls. Typical calls have a bimodal spectrum consisting of formant-like low-frequency (~0.9 kHz) and high-frequency (~2.7 kHz) components that are transduced by different sensory organs in the inner ear. In behavioral experiments, only bimodal calls reliably elicited phonotaxis in no-choice tests, and they were selectively chosen over unimodal calls in two-alternative choice tests...
July 26, 2017: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/28747669/compressive-sampling-based-on-frequency-saliency-for-remote-sensing-imaging
#20
Jin Li, Zilong Liu, Fengdeng Liu
In saliency-based compressive sampling (CS) for remote sensing image signals, the saliency information of images is used to allocate more sensing resources to salient regions than to non-salient regions. However, the pulsed cosine transform method can generate large errors in the calculation of saliency information because it uses only the signs of the coefficients of the discrete cosine transform for low-resolution images. In addition, the reconstructed images can exhibit blocking effects because blocks are used as the processing units in CS...
July 26, 2017: Scientific Reports
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