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https://www.readbyqxmd.com/read/29347711/shock-wave-like-structures-induced-by-an-exothermic-neutralization-reaction-in-miscible-fluids
#1
Dmitry Bratsun, Alexey Mizev, Elena Mosheva, Konstantin Kostarev
We report shock-wave-like structures that are strikingly different from previously observed fingering instabilities, which occur in a two-layer system of miscible fluids reacting by a second-order reaction A+B→S in a vertical Hele-Shaw cell. While the traditional analysis expects the occurrence of a diffusion-controlled convection, we show both experimentally and theoretically that the exothermic neutralization reaction can also trigger a wave with a perfectly planar front and nearly discontinuous change in density across the front...
November 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347709/interaction-of-a-planar-reacting-shock-wave-with-an-isotropic-turbulent-vorticity-field
#2
César Huete, Tai Jin, Daniel Martínez-Ruiz, Kun Luo
Linear interaction analysis (LIA) is employed to investigate the interaction of reactive and nonreactive shock waves with isotropic vortical turbulence. The analysis is carried out, through Laplace-transform technique, accounting for long-time effects of vortical disturbances on the burnt-gas flow in the fast-reaction limit, where the reaction-region thickness is significantly small in comparison with the most representative turbulent length scales. Results provided by the opposite slow-reaction limit are also recollected...
November 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347540/compliant-contact-versus-rigid-contact-a-comparison-in-the-context-of-granular-dynamics
#3
Arman Pazouki, Michał Kwarta, Kyle Williams, William Likos, Radu Serban, Paramsothy Jayakumar, Dan Negrut
We summarize and numerically compare two approaches for modeling and simulating the dynamics of dry granular matter. The first one, the discrete-element method via penalty (DEM-P), is commonly used in the soft matter physics and geomechanics communities; it can be traced back to the work of Cundall and Strack [P. Cundall, Proc. Symp. ISRM, Nancy, France 1, 129 (1971); P. Cundall and O. Strack, Geotechnique 29, 47 (1979)GTNQA80016-850510.1680/geot.1979.29.1.47]. The second approach, the discrete-element method via complementarity (DEM-C), considers the grains perfectly rigid and enforces nonpenetration via complementarity conditions; it is commonly used in robotics and computer graphics applications and had two strong promoters in Moreau and Jean [J...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347287/solution-of-the-riemann-problem-for-polarization-waves-in-a-two-component-bose-einstein-condensate
#4
S K Ivanov, A M Kamchatnov, T Congy, N Pavloff
We provide a classification of the possible flows of two-component Bose-Einstein condensates evolving from initially discontinuous profiles. We consider the situation where the dynamics can be reduced to the consideration of a single polarization mode (also denoted as "magnetic excitation") obeying a system of equations equivalent to the Landau-Lifshitz equation for an easy-plane ferromagnet. We present the full set of one-phase periodic solutions. The corresponding Whitham modulation equations are obtained together with formulas connecting their solutions with the Riemann invariants of the modulation equations...
December 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346862/craters-produced-by-explosions-in-a-granular-medium
#5
F Pacheco-Vázquez, A Tacumá, J O Marston
We report on an experimental investigation of craters generated by explosions at the surface of a model granular bed. Following the initial blast, a pressure wave propagates through the bed, producing high-speed ejecta of grains and ultimately a crater. We analyzed the crater morphology in the context of large-scale explosions and other cratering processes. The process was analyzed in the context of large-scale explosions, and the crater morphology was compared with those resulting from other cratering processes in the same energy range...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29336127/popularity-and-harms-of-aural-foreign-bodies-a-descriptive-study-of-patients-in-baqiyatallah-university-hospital-tehran-iran
#6
Abolfazl Taheri, Sina Navaei Mehmandari, Mojtaba Shahidi, Hamidreza Mehdizadeh, Seyyed Mohammad Javad Mirlohi, Nasrin Mohammadi Aref, Mahsa Alborzi Avanaki, Mohammad Hossein Khosravi
OBJECTIVE: To evaluate the prevalence of external ear complications among Iranian aural foreign body users attending to otolaryngology clinic of our hospital. METHODS: In this cross-sectional study patients attending to Otolaryngology clinics of Baqiyatallah hospital were enrolled regardless of their age, gender and reason of attending. Patients between 15 and 60 years of age were included in the present study. Those with positive history of chronic ear diseases, ear surgery, congenital ear disorders, trauma to ear or head and neck region or shock wave trauma were excluded from the study...
December 1, 2017: International Tinnitus Journal
https://www.readbyqxmd.com/read/29333511/evaluating-the-importance-of-different-computed-tomography-scan-based-factors-in-predicting-the-outcome-of-extracorporeal-shock-wave-lithotripsy-for-renal-stones
#7
Muhammad Waqas, Imad-Ud-Din Saqib, Muhammad Imran Jamil, Mohammad Ayaz Khan, Saeed Akhter
Purpose: To evaluate the impact of various computed tomography scan-based parameters of renal stones on the outcome of extracorporeal shock wave lithotripsy (ESWL). Materials and Methods: We conducted a retrospective study of patients who underwent ESWL for renal stones (sized 5-20 mm) from January 2013 to December 2016. We evaluated body mass index, location of the stone, skin-to-stone distance (SSD), stone attenuation value (SAV), stone diameter, Hounsfield density, stone area, and stone volume...
January 2018: Investigative and Clinical Urology
https://www.readbyqxmd.com/read/29333461/extracorporeal-shock-wave-therapy-for-coronary-artery-disease-relationship-of-symptom-amelioration-and-ischemia-improvement
#8
Youko Takakuwa, Masayoshi Sarai, Hideki Kawai, Akira Yamada, Kenji Shiino, Kayoko Takada, Yasuomi Nagahara, Meiko Miyagi, Sadako Motoyama, Hiroshi Toyama, Yukio Ozaki
Objectives: The current management of coronary artery disease (CAD) relies on three major therapeutic options, namely medication, percutaneous coronary intervention (PCI), and coronary artery bypass grafting (CABG). However, severe CAD that is not indicated for PCI or CABG still bears a poor prognosis due to the lack of effective treatments. In 2006, extracorporeal cardiac shock wave (SW) therapy reported on human for the first time. This treatment resulted in better myocardial perfusion as evaluated by dipyridamole stress thallium scintigraphy, angina symptoms, and exercise tolerance...
2018: Asia Oceania Journal of Nuclear Medicine & Biology
https://www.readbyqxmd.com/read/29331145/modelling-the-effect-of-acoustic-waves-on-the-thermodynamics-and-kinetics-of-phase-transformation-in-a-solution-including-mass-transportation
#9
S R Haqshenas, I J Ford, N Saffari
Effects of acoustic waves on a phase transformation in a metastable phase were investigated in our previous work [S. R. Haqshenas, I. J. Ford, and N. Saffari, "Modelling the effect of acoustic waves on nucleation," J. Chem. Phys. 145, 024315 (2016)]. We developed a non-equimolar dividing surface cluster model and employed it to determine the thermodynamics and kinetics of crystallisation induced by an acoustic field in a mass-conserved system. In the present work, we developed a master equation based on a hybrid Szilard-Fokker-Planck model, which accounts for mass transportation due to acoustic waves...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29327602/combination-therapy-versus-exercise-and-orthotic-support-in-the-management-of-pain-in-plantar-fasciitis-a-randomized-controlled-trial
#10
Eda Cinar, Shikha Saxena, Fatma Uygur
BACKGROUND: This study aimed at estimating the effectiveness of two commonly used modalities-extracorporeal shock wave therapy (ESWT) and low-level laser therapy (LLLT)-each combined with usual care (exercises and orthotic supports) in comparison to only usual care to relieve pain in patients with plantar fasciitis (PF). METHODS: Participants with PF were randomly allocated into 3 groups: ESWT (n = 25), LLLT (n = 24), and control (n = 17). All participants received a home exercise program with orthotic support...
January 1, 2018: Foot & Ankle International
https://www.readbyqxmd.com/read/29327088/amplification-of-pressure-waves-in-laser-assisted-endodontics-with-synchronized-delivery-of-er-yag-laser-pulses
#11
Nejc Lukač, Matija Jezeršek
When attempting to clean surfaces of dental root canals with laser-induced cavitation bubbles, the resulting cavitation oscillations are significantly prolonged due to friction on the cavity walls and other factors. Consequently, the collapses are less intense and the shock waves that are usually emitted following a bubble's collapse are diminished or not present at all. A new technique of synchronized laser-pulse delivery intended to enhance the emission of shock waves from collapsed bubbles in fluid-filled endodontic canals is reported...
January 11, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29320964/autologous-us-guided-prp-injection-versus-us-guided-focal-extracorporeal-shock-wave-therapy-for-chronic-lateral-epicondylitis-a-minimum-of-2-year-follow-up-retrospective-comparative-study
#12
Mattia Alessio-Mazzola, Ilaria Repetto, Besmir Biti, Roberto Trentini, Matteo Formica, Lamberto Felli
PURPOSE: To compare the efficacy of two independent groups of patients treated with ultrasound (US)-guided extracorporeal shock wave (ESW) therapy and with US-guided injection of platelet-rich plasma (PRP) for chronic lateral epicondylitis (LE) with a minimum of 2-year follow-up. METHODS: We retrospectively evaluated 63 patients treated for chronic LE (31 patients with autologous US-guided PRP injection and 32 patients with US-guided focal ESW therapy) from 2009 to 2014...
January 2018: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/29319102/experimental-and-modelling-study-of-the-multichannel-thermal-dissociations-of-ch3f-and-ch2f
#13
C J Cobos, G Knight, L Sölter, E Tellbach, J Troe
The thermal unimolecular dissociation of CH3F was studied in shock waves by monitoring the UV absorption of a dissociation product identified as CH2F. It is concluded that, under conditions applied, the formation of this species corresponds to a minor, spin-allowed, dissociation channel of about 3% yield. Near to the low-pressure limit of the reaction, on the other hand, the energetically more favourable dissociation leads to 3CH2 + HF on a dominant, spin-forbidden, pathway. By considering the multichannel character of the reaction, it is shown that, in contrast to the low-pressure range, the high-pressure range of the reaction should be dominated by CH2F formation...
January 10, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29316809/extracorporeal-shock-waves-trigger-tenogenic-differentiation-of-human-adipose-derived-stem-cells
#14
Letizia Rinella, Francesca Marano, Laura Paletto, Marco Fraccalvieri, Laura Annaratone, Isabella Castellano, Nicoletta Fortunati, Alessandro Bargoni, Laura Berta, Roberto Frairia, Maria Graziella Catalano
PURPOSES: Incomplete tendon healing impairs the outcome of tendon ruptures and tendinopathies. Human Adipose-derived Stem Cells (hASCs) are promising for tissue engineering applications. Extracorporeal Shock Waves (ESW) are a leading choice for the treatment of several tendinopathies. In this study, we investigated the effects of ESW treatment and tenogenic medium on the differentiation of hASCs into tenoblast-like cells. MATERIALS AND METHODS: hASCs were treated with ESW generated by a piezoelectric device and tenogenic medium...
January 9, 2018: Connective Tissue Research
https://www.readbyqxmd.com/read/29312775/case-report-improvement-of-cardiac-remodeling-with-shock-wave-therapy-of-a-patient-with-ischemic-cardiomyopathy
#15
Yingnan Bai, Xiaoyan Wang, Xin Deng, Hongyi Wu, Abdel Hamid Fathy, Yan Xi, Yunzeng Zou, Jie Cui, Junbo Ge
Percutaneous coronary intervention (PCI) and coronary-artery bypass grafting (CABG) are two major preferred reperfusion strategies to restore the ischemic-related artery patency, but PCI and CABG do not necessarily guarantee the recovery of post-procedure left ventricular (LV) dysfunction and release of symptoms. Moreover, there is no definitive effective way to enhance microcirculations. Theoretically, shock wave therapy (SWT) is an option. We report here a case of patient who received SWT. The patient's medical history was characterized by chest pain for 20 years, having received CABG 13 years ago...
December 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29309329/extracorporal-shock-wave-therapy-enhances-receptor-for-advanced-glycated-end-product-dependent-flap-survival-and-angiogenesis
#16
Emrullah Birgin, Christoffer Gebhardt, Svetlana Hetjens, Sebastian Fischer, Felix Rückert, Matthias A Reichenberger
BACKGROUND/OBJECTIVES: Loss of skin flaps due to deteriorated wound healing is a crucial clinical issue. Extracorporal shock wave therapy (ESWT) promotes flap healing by inducing angiogenesis and suppressing inflammation. The receptor for advanced glycation end-products (RAGEs) was identified to play a pivotal role in wound healing. However, to date, the role of RAGE in skin flaps and its interference with ESWT are unknown. METHODS: Caudally pedicled musculocutanous skin flaps in RAGE and wt mice were treated with low-dose extracorporal shock waves (s-RAGE, s-wt) and analyzed for flap survival, histomorphologic studies, and immunohistochemistry during a 10-day period...
January 5, 2018: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/29308789/corrigendum-successful-treatment-of-biofilm-infections-using-shock-waves-combined-with-antibiotic-therapy
#17
Divya Prakash Gnanadhas, Monalisha Elango, S Janardhanraj, C S Srinandan, Akshay Datey, Richard A Strugnell, Jagadeesh Gopalan, Dipshikha Chakravortty
This corrects the article DOI: 10.1038/srep17440.
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29305300/-epidemiological-characteristics-of-st-segment-elevation-myocardial-infarction-in-peru-results-of-the-peruvian-registry-of-st-segment-elevation-myocardial-infarction-perstemi
#18
Manuel Chacón-Diaz, Alejandro Vega, Ofelia Aráoz, Patricia Ríos, Roberto Baltodano, Fernando Villanueva, Alexander Montesinos, Jorge Martos, John Zevallos, David Miranda, Jorge Gutierrez, José Carasas, Alex Pecho, Sandra Negrón, Henry Anchante, Nassip Llerena, German Yabar, Javier Chumbe, Sara Ramírez, Marco Lazo, Jorge Sotomayor, Marco López, Carlos Perez
OBJECTIVE: To determine the epidemiological characteristics, treatment, reperfusion strategies and in-hospital adverse events of patients with ST elevation myocardial infarction in Peru. METHODS: Observational, prospective multicentre study in patients over 18 years admitted to hospital with a diagnosis of ST elevation myocardial infarction. RESULTS: A total of 396 patients were enrolled in the registry during February 2016 to February 2017...
January 2, 2018: Archivos de Cardiología de México
https://www.readbyqxmd.com/read/29302654/shock-tube-study-of-the-decomposition-of-tetramethylsilane-using-gas-chromatography-and-high-repetition-rate-time-of-flight-mass-spectrometry
#19
P Sela, S Peukert, J Herzler, M Fikri, C Schulz
The decomposition of tetramethylsilane was studied in shock-tube experiments in a temperature range of 1270-1580 K and pressures ranging from 1.5 to 2.3 bar behind reflected shock waves combining gas chromatography/mass spectrometry (GC/MS) and high-repetition-rate time-of-flight mass spectrometry (HRR-TOF-MS). The main observed products were methane (CH4), ethylene (C2H4), ethane (C2H6), and acetylene (C2H2). In addition, the formation of a solid deposit was observed, which was identified to consist of silicon- and carbon-containing nanoparticles...
January 5, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29301325/extracorporeal-shock-wave-therapy-alters-the-expression-of-fibrosis-related-molecules-in-fibroblast-derived-from-human-hypertrophic-scar
#20
Hui Song Cui, A Ram Hong, June-Bum Kim, Joo Hyang Yu, Yoon Soo Cho, So Young Joo, Cheong Hoon Seo
Extracorporeal shock wave therapy (ESWT) considerably improves the appearance and symptoms of post-burn hypertrophic scars (HTS). However, the mechanism underlying the observed beneficial effects is not well understood. The objective of this study was to elucidate the mechanism underlying changes in cellular and molecular biology that is induced by ESWT of fibroblasts derived from scar tissue (HTSFs). We cultured primary dermal fibroblasts derived from human HTS and exposed these cells to 1000 impulses of 0...
January 2, 2018: International Journal of Molecular Sciences
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