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https://www.readbyqxmd.com/read/28934699/pseudopotential-calculations-of-alsb-under-pressure
#1
H Algarni, O A Al-Hagan, N Bouarissa, M A Khan, T F Alhuwaymel
The dependence on hydrostatic pressure of the electronic and optical properties of zinc-blende AlSb semiconducting material in the pressure range of 0-20kbar has been reported using a pseudopotential approach. At zero pressure, our findings showed that the electron and heavy hole effective masses are 0.11 and 0.38m0, respectively. Moreover, our results yielded values of 3.3289 and 11.08 for refractive index and high frequency dielectric constant, respectively. These results are found to be in good accord with experiment...
September 14, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28927213/ten-step-minimally-invasive-spine-lumbar-decompression-and-dural-repair-through-tubular-retractors
#2
Mohamed Abdelatif Boukebir, Connor David Berlin, Rodrigo Navarro-Ramirez, Tim Heiland, Karsten Schöller, Cameron Rawanduzy, Sertaç Kirnaz, Ajit Jada, Roger Härtl
BACKGROUND: Minimally invasive spine (MIS) surgery utilizing tubular retractors has become an increasingly popular approach for decompression in the lumbar spine. However, a better understanding of appropriate indications, efficacious surgical techniques, limitations, and complication management is required to effectively teach the procedure and to facilitate the learning curve. OBJECTIVE: To describe our experience and recommendations regarding tubular surgery for lumbar disc herniations, foraminal compression with unilateral radiculopathy, lumbar spinal stenosis, synovial cysts, and dural repair...
April 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28926716/broadband-acoustic-resonance-dissolution-spectroscopy-bards-a-novel-approach-to-investigate-the-wettability-of-pharmaceutical-powder-blends
#3
Raghu V G Peddapatla, M Rizwan Ahmed, Caroline A Blackshields, M J Sousa-Gallagher, Sean McSweeney, J Krüse, Abina M Crean, Dara Fitzpatrick
The ability of Broadband Acoustic Resonance Dissolution Spectroscopy (BARDS) to assess the wettability of powder blends is investigated. BARDS is a novel analytical technology developed based on the change in acoustic phenomenon observed when material is added into a solvent under resonance. Addition of solid material to the solvent results in the introduction of gas (air) into the solvent, changing the compressibility of the solvent system and reducing the velocity of sound in the solvent. As a material is wetted and dissolved, the gas is released from the solvent and resonance frequency is altered...
September 19, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28926262/effect-of-the-incorporation-of-nano-sized-titanium-dioxide-on-the-interfacial-properties-of-dppc-langmuir-monolayers
#4
Eduardo Guzmán, Eva Santini, Michele Ferrari, Libero Liggieri, Francesca Ravera
The effect of the incorporation of hydrophilic titanium dioxide (TiO2) nanoparticles on the interfacial properties of Langmuir monolayers of 1,2-Dipalmitoyl-sn-glycerol-3-phosphocholine (DPPC) has been evaluated combining interfacial thermodynamic studies, dilatational rheology and Brewster Angle Microscopy (BAM). The results show that the TiO2 nanoparticles are able to penetrate into DPPC layers, modifying the organization of the molecules and, consequently, the phase behaviour and viscoelastic properties of the systems...
September 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28922351/estimation-of-the-mechanical-properties-of-the-eye-through-the-study-of-its-vibrational-modes
#5
M Á Aloy, J E Adsuara, P Cerdá-Durán, M Obergaulinger, J J Esteve-Taboada, T Ferrer-Blasco, R Montés-Micó
Measuring the eye's mechanical properties in vivo and with minimally invasive techniques can be the key for individualized solutions to a number of eye pathologies. The development of such techniques largely relies on a computational modelling of the eyeball and, it optimally requires the synergic interplay between experimentation and numerical simulation. In Astrophysics and Geophysics the remote measurement of structural properties of the systems of their realm is performed on the basis of (helio-)seismic techniques...
2017: PloS One
https://www.readbyqxmd.com/read/28918706/speech-intelligibility-benefits-of-frequency-lowering-algorithms-in-adult-hearing-aid-users-a-systematic-review-and-meta-analysis
#6
Andrea Simpson, Alicia Bond, Michelle Loeliger, Sandy Clarke
OBJECTIVE: This systematic review evaluated the effectiveness of two frequency-lowering schemes, non-linear frequency compression and frequency transposition, at improving speech intelligibility for adult hearing-impaired populations. DESIGN: A systematic search of 10 electronic databases was carried out using pre-defined inclusion criteria. Accepted articles were then critically appraised using the Effective Public Health Practice Project (EPHPP) Critical Appraisal Tool...
September 18, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/28910623/laminar-organization-of-encoding-and-memory-reactivation-in-the-parietal-cortex
#7
Aaron A Wilber, Ivan Skelin, Wei Wu, Bruce L McNaughton
Egocentric neural coding has been observed in parietal cortex (PC), but its topographical and laminar organization is not well characterized. We used multi-site recording to look for evidence of local clustering and laminar consistency of linear and angular velocity encoding in multi-neuronal spiking activity (MUA) and in the high-frequency (300-900 Hz) component of the local field potential (HF-LFP), believed to reflect local spiking activity. Rats were trained to run many trials on a large circular platform, either to LED-cued goal locations or as a spatial sequence from memory...
September 13, 2017: Neuron
https://www.readbyqxmd.com/read/28905100/frequency-and-influencing-factors-of-cardiopulmonary-resuscitation-related-injuries-during-implementation-of-the-american-heart-association-2010-guidelines-a-retrospective-study-based-on-autopsy-and-postmortem-computed-tomography
#8
Rutsuko Yamaguchi, Yohsuke Makino, Fumiko Chiba, Suguru Torimitsu, Daisuke Yajima, Go Inokuchi, Ayumi Motomura, Mari Hashimoto, Yumi Hoshioka, Tomohiro Shinozaki, Hirotaro Iwase
AIM: To determine the frequency of cardiopulmonary resuscitation (CPR)-related injuries and factors involved in their occurrence, data based on forensic autopsy and postmortem computed tomography (PMCT) during implementation of the 2010 American Heart Association Guidelines for CPR were studied. METHODS: We retrospectively evaluated data on adult patients with non-traumatic deaths who had undergone manual CPR and autopsy from January 2012 to December 2014. CPR-related injuries were analyzed on autopsy records and PMCT images and compared with results of previous studies...
September 13, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28894011/palpitations-in-a-72-year-old-woman
#9
Claire A Martin, Parag R Gajendragadkar, Sharad Agarwal
CLINICAL INTRODUCTION: A 72-year-old woman presented with an 8-year history of palpitations occurring every few weeks. They were sudden in onset, were associated with dizziness and could last for up to 2 hours. She was prescribed bisoprolol which reduced the frequency of events but did not abolish them. Baseline ECG and echocardiography were normal. She was referred for electrophysiological study. Despite initial difficulties, diagnostic catheters were placed in the right ventricular (RV) apex and in the coronary sinus (CS) via the right internal jugular vein and superior vena cava (SVC) (figure 1A)...
October 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28888055/evaluation-of-loading-parameters-for-murine-axial-tibial-loading-stimulating-cortical-bone-formation-while-reducing-loading-duration
#10
David Sun, Michael D Brodt, Heather M Zannit, Nilsson Holguin, Matthew J Silva
Classic studies in bone mechanobiology have established the importance of loading parameters on the anabolic response. Most of these early studies were done using loading methods not currently in favor, and using non-murine species. Our objective was to re-examine the effects of several loading parameters on the response of cortical bone using the contemporary murine axial tibial compression model. We subjected tibias of 5-month old, female C57Bl/6 mice to cyclic (4 Hz) mechanical loading and examined bone formation responses using dynamic and static histomorphometry...
September 9, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28883723/comparison-of-pulsed-versus-continuous-oxygen-delivery-using-realistic-adult-nasal-airway-replicas
#11
John Z Chen, Ira M Katz, Marine Pichelin, Kaixian Zhu, Georges Caillibotte, Michelle L Noga, Warren H Finlay, Andrew R Martin
BACKGROUND: Portable oxygen concentrators (POCs) typically include pulse flow (PF) modes to conserve oxygen. The primary aims of this study were to develop a predictive in vitro model for inhaled oxygen delivery using a set of realistic airway replicas, and to compare PF for a commercial POC with steady flow (SF) from a compressed oxygen cylinder. METHODS: Experiments were carried out using a stationary compressed oxygen cylinder, a POC, and 15 adult nasal airway replicas based on airway geometries derived from medical images...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28880172/spectrum-compensation-for-time-reversal-method-on-ultrasonic-target-detection-using-pulse-compression
#12
Dai Chimura, Ryo Toh, Seiichi Motooka
This paper discusses a method of time reversal (TR) for target detection using a signal with a higher signal-to-noise ratio (SNR) and higher resolution. To acquire a signal with a higher SNR and broader spectrum, we have proposed a sensitivity-compensated (SC) signal. In this study, we propose three types of sensitivity-compensated-for-time-reversal (SC-for-TR) signals. A sensitivity-compensated-amplitude-modulated-for-time-reversal signal and a sensitivity-compensated-frequency-modulated-for-time-reversal signal are calculated using squared spectrum compensation...
September 4, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28880168/a-new-dynamic-complex-baseband-pulse-compression-method-for-chirp-coded-excitation-in-medical-ultrasound-imaging
#13
Jinbum Kang, Yeajin Kim, Wooyoul Lee, Yangmo Yoo
Chirp-coded excitation can increase the signal-to-noise ratio (SNR) without degrading the axial resolution. Effective pulse compression (PC) is important to maintain the axial resolution and can be achieved with radio frequency (RF) and complex baseband (CBB) data (i.e., PCRF and PCCBB, respectively). PCCBB can further reduce the computational complexity compared to PCRF; however, PCCBB suffers from a degraded SNR due to tissue attenuation. In this study, we propose a new dynamic complex baseband pulse compression method (PCCBB-Dynamic) that can improve the SNR while compensating for tissue attenuation...
September 1, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28864072/improvements-in-the-quality-of-advanced-life-support-and-patient-outcome-after-implementation-of-a-standardized-real-life-post-resuscitation-feedback-system
#14
Pia Hubner, Elisabeth Lobmeyr, Christian Wallmüller, Michael Poppe, Philip Datler, Markus Keferböck, Sebastian Zeiner, Alexander Nürnberger, Andreas Zajicek, Anton Laggner, Fritz Sterz, Patrick Sulzgruber
BACKGROUND: Educational aspects in the training of advanced life support (ALS) represent a key role in critical care management of patients with out-of-hospital cardiac arrest (OHCA) and received special attention in guidelines of various international societies. While a positive association of feedback on ALS performance in training conditions is well established, data on the impact of a real-life post-resuscitation feedback on both ALS quality and outcome remain scarce and inconclusive...
August 31, 2017: Resuscitation
https://www.readbyqxmd.com/read/28863614/towards-a-joint-reflection-distortion-otoacoustic-emission-profile-results-in-normal-and-impaired-ears
#15
Carolina Abdala, Radha Kalluri
Otoacoustic emissions (OAEs) provide salient information about cochlear function and dysfunction. Two broad classes of emissions, linear reflection and nonlinear distortion, arise via distinct cochlear processes and hence, appear to provide independent information about cochlear health and hearing. Considered in combination, these two OAE types may characterize sensory hearing loss most effectively. In this study, the level-dependent growth of stimulus-frequency OAEs (a reflection-type emission) and distortion-product OAEs (a distortion-type emission) were measured in ten normal-hearing ears and eight ears with slight-to-moderate sensorineural hearing loss...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863610/acoustic-and-perceptual-effects-of-amplitude-and-frequency-compression-on-high-frequency-speech
#16
Joshua M Alexander, Varsha Rallapalli
This study investigated how six different amplification methods influence acoustic properties, and subsequently perception, of high-frequency cues in fricatives that have been processed with conventional full bandwidth amplification or nonlinear frequency compression (NFC)-12 conditions total. Amplification methods included linear gain, fast/slow-acting wide dynamic range compression crossed with fixed/individualized compression parameters, and a method with adaptive time constants. Twenty-one hearing-impaired listeners identified seven fricatives in nonsense syllables produced by female talkers...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28862350/reconstruction-by-calibration-over-tensors-for-multi-coil-multi-acquisition-balanced-ssfp-imaging
#17
Erdem Biyik, Efe Ilicak, Tolga Çukur
PURPOSE: To develop a rapid imaging framework for balanced steady-state free precession (bSSFP) that jointly reconstructs undersampled data (by a factor of R) across multiple coils (D) and multiple acquisitions (N). To devise a multi-acquisition coil compression technique for improved computational efficiency. METHODS: The bSSFP image for a given coil and acquisition is modeled to be modulated by a coil sensitivity and a bSSFP profile. The proposed reconstruction by calibration over tensors (ReCat) recovers missing data by tensor interpolation over the coil and acquisition dimensions...
September 1, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28851244/preliminary-evaluation-of-a-novel-non-linear-frequency-compression-scheme-for-use-in-children
#18
Jace Wolfe, Mila Duke, Erin C Schafer, Julia Rehmann, Siddhartha Jha, Silvia Allegro Baumann, Andrew John, Christine Jones
OBJECTIVE: The primary goal of this study was to evaluate a new form of non-linear frequency compression (NLFC) in children. The new NLFC processing scheme is adaptive and potentially allows for a better preservation of the spectral characteristics of the input sounds when compared to conventional NLFC processing. DESIGN: A repeated-measures design was utilised to compare the speech perception of the participants with two configurations of the new adaptive NLFC processing to their performance with the existing NLFC...
August 29, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/28839443/efficacy-of-forced-coagulation-with-low-high-frequency-power-setting-during-endoscopic-submucosal-dissection
#19
Tsukasa Ishida, Takashi Toyonaga, Yoshiko Ohara, Tadao Nakashige, Yasuaki Kitamura, Ryusuke Ariyoshi, Hiroshi Takihara, Shinichi Baba, Tetsuya Yoshizaki, Fumiaki Kawara, Shinwa Tanaka, Yoshinori Morita, Eiji Umegaki, Namiko Hoshi, Takeshi Azuma
AIM: To investigated the hemostatic ability of the S and F1-10 methods in clinical and ex vivo studies. METHODS: The hemostatic abilities of the two methods were analyzed retrospectively in all six gastric endoscopic submucosal dissection cases. The treated vessel diameter, compressed vessel frequency, and bleeding frequency after cutting the vessels were noted by the recorded videos. The coagulation mechanism of the two power settings was evaluated using the data recording program and histological examination on macro- and microscopic levels in the ex vivo experiments using porcine tissues...
August 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28836061/a-re-examination-of-the-effect-of-masker-phase-curvature-on-non-simultaneous-masking
#20
Robert P Carlyon, Sheila Flanagan, John M Deeks
Forward masking of a sinusoidal signal is determined not only by the masker's power spectrum but also by its phase spectrum. Specifically, when the phase spectrum is such that the output of an auditory filter centred on the signal has a highly modulated ("peaked") envelope, there is less masking than when that envelope is flat. This finding has been attributed to non-linearities, such as compression, reducing the average neural response to maskers that produce more peaked auditory filter outputs (Carlyon and Datta, J Acoust Soc Am 101:3636-3647, 1997)...
August 23, 2017: Journal of the Association for Research in Otolaryngology: JARO
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