keyword
MENU ▼
Read by QxMD icon Read
search

Shock wave

keyword
https://www.readbyqxmd.com/read/28429748/the-pre-argo-ocean-reanalyses-may-be-seriously-affected-by-the-spatial-coverage-of-moored-buoys
#1
S Sivareddy, Arya Paul, Travis Sluka, M Ravichandran, Eugenia Kalnay
Assimilation methods, meant to constrain divergence of model trajectory from reality using observations, do not exactly satisfy the physical laws governing the model state variables. This allows mismatches in the analysis in the vicinity of observation locations where the effect of assimilation is most prominent. These mismatches are usually mitigated either by the model dynamics in between the analysis cycles and/or by assimilation at the next analysis cycle. However, if the observations coverage is limited in space, as it was in the ocean before the Argo era, these mechanisms may be insufficient to dampen the mismatches, which we call shocks, and they may remain and grow...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28424229/tension-activated-channels-in-the-mechanism-of-osmotic-fitness-in-pseudomonas-aeruginosa
#2
Uğur Çetiner, Ian Rowe, Anthony Schams, Christina Mayhew, Deanna Rubin, Andriy Anishkin, Sergei Sukharev
Pseudomonas aeruginosa (PA) is an opportunistic pathogen with an exceptional ability to adapt to a range of environments. Part of its adaptive potential is the ability to survive drastic osmolarity changes. Upon a sudden dilution of external medium, such as during exposure to rain, bacteria evade mechanical rupture by engaging tension-activated channels that act as osmolyte release valves. In this study, we compare fast osmotic permeability responses in suspensions of wild-type PA and Escherichia coli (EC) strains in stopped-flow experiments and provide electrophysiological descriptions of osmotic-release channels in PA...
April 19, 2017: Journal of General Physiology
https://www.readbyqxmd.com/read/28416987/importance-of-exercise-testing-shortly-after-subcutaneous-implantable-cardioverter-defibrillator-implantation-in-patients-with-brugada-syndrome-the-first-case-of-associated-inappropriate-shock-in-japan
#3
Kohei Ishibashi, Takashi Noda, Tsukasa Kamakura, Mitsuru Wada, Yuko Inoue, Hideo Okamura, Kengo Kusano
We report the case of a 51-year-old patient with Brugada syndrome (BrS) who experienced inappropriate shock due to T-wave oversensing (TWOS) during exercise when the optimal sensing vector was selected based on the automatic analysis by a subcutaneous implantable cardioverter-defibrillator (S-ICD). After selecting another vector during exercise testing, TWOS did not re-occur. Selection of appropriate sensing vector based on analyses under various conditions, including during exercise after S-ICD implantation, should be considered for patients with BrS...
April 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/28416040/effect-of-early-sexual-debut-on-high-school-completion-in-south-africa
#4
A V Bengesai, H T A Khan, R Dube
Early sexual debut is of major concern because it is a correlate for health and economic shocks experienced in adulthood. In South Africa, this concern has provided impetus for research directed at the HIV and AIDS epidemic, teenage pregnancy and the effect of adolescent sexual behaviour on persistence in school. Of interest to the present study is high school completion, which is a well-established empirical barometer of adult socioeconomic opportunities. Using data from the five waves of the Cape Area Panel Study (CAPS), this paper examines the association between sexual behaviours initiated in pre- and early adolescence and high school completion rates...
April 18, 2017: Journal of Biosocial Science
https://www.readbyqxmd.com/read/28415375/nonlinear-monte-carlo-model-of-superdiffusive-shock-acceleration-with-magnetic-field-amplification
#5
Andrei M Bykov, Donald C Ellison, Sergei M Osipov
Fast collisionless shocks in cosmic plasmas convert their kinetic energy flow into the hot downstream thermal plasma with a substantial fraction of energy going into a broad spectrum of superthermal charged particles and magnetic fluctuations. The superthermal particles can penetrate into the shock upstream region producing an extended shock precursor. The cold upstream plasma flow is decelerated by the force provided by the superthermal particle pressure gradient. In high Mach number collisionless shocks, efficient particle acceleration is likely coupled with turbulent magnetic field amplification (MFA) generated by the anisotropic distribution of accelerated particles...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28415266/cavitation-and-spallation-in-liquid-metal-droplets-produced-by-subpicosecond-pulsed-laser-radiation
#6
M S Krivokorytov, A Yu Vinokhodov, Yu V Sidelnikov, V M Krivtsun, V O Kompanets, A A Lash, K N Koshelev, V V Medvedev
The deformation and fragmentation of liquid metal microdroplets by intense subpicosecond Ti:sapphire laser pulses is experimentally studied with stroboscopic shadow photography. The experiments are performed at a peak intensity of 10^{14}W/cm^{2} at the target's surface, which produces shock waves with pressures in the Mbar range. As a result of such a strong impact, the droplet is transformed into a complex-shaped hollow structure that undergoes asymmetrical expansion and eventually fragments. The hollow structure of the expanding target is explained by the effects of cavitation and spallation that follow the propagation of the laser-induced shock wave...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28414682/a-left-main-coronary-artery-thrombus-presenting-as-a-non-st-elevation-mi
#7
U Ezema, D Daberkow, T Delord, L Guidry, N R Sells
INTRODUCTION: Left main coronary artery (LMCA); thrombus with an acute myocardial infarction identified with coronary angiography is a clinically rare condition with an extremely high mortality rate. We present a case of LMCA thrombus that presented as a non-ST elevation myocardial infarction (NSTEMI);. CASE: A 45-year-old woman with a history of tobacco use and hyperlipidemia presented with a complaint of 10/10 "hard pain" across her chest radiating to her left shoulder and breast which woke her from sleep...
March 2017: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28409011/utility-of-t-wave-amplitude-as-a-non-invasive-risk-marker-of-sudden-cardiac-death-in-hypertrophic-cardiomyopathy
#8
Alan Sugrue, Ammar M Killu, Christopher V DeSimone, Anwar A Chahal, Josh C Vogt, Vaclav Kremen, JoJo Hai, David O Hodge, Nancy G Acker, Jeffrey B Geske, Michael J Ackerman, Steve R Ommen, Grace Lin, Peter A Noseworthy, Peter A Brady
OBJECTIVE: Sudden cardiac arrest (SCA) is the most devastating outcome in hypertrophic cardiomyopathy (HCM). We evaluated repolarisation features on the surface electrocardiogram (ECG) to identify the potential risk factors for SCA. METHODS: Data was collected from 52 patients with HCM who underwent implantable cardioverter defibrillator (ICD) implantation. Leads V2 and V5 from the ECG closest to the time of ICD implant were utilised for measuring the Tpeak-Tend interval (Tpe), QTc, Tpe/QTc, T-wave duration and T-wave amplitude...
2017: Open Heart
https://www.readbyqxmd.com/read/28405383/a-new-apparatus-to-induce-lysis-of-planktonic-microbial-cells-by-shock-compression-cavitation-and-spray
#9
A Schiffer, M N Gardner, R H Lynn, V L Tagarielli
Experiments were conducted on an aqueous growth medium containing cultures of Escherichia coli (E. coli) XL1-Blue, to investigate, in a single experiment, the effect of two types of dynamic mechanical loading on cellular integrity. A bespoke shock tube was used to subject separate portions of a planktonic bacterial culture to two different loading sequences: (i) shock compression followed by cavitation, and (ii) shock compression followed by spray. The apparatus allows the generation of an adjustable loading shock wave of magnitude up to 300 MPa in a sterile laboratory environment...
March 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28403861/cardiac-shock-wave-therapy-in-the-treatment-of-coronary-artery-disease-systematic-review-and-meta-analysis
#10
REVIEW
Greta Burneikaitė, Evgeny Shkolnik, Jelena Čelutkienė, Gitana Zuozienė, Irena Butkuvienė, Birutė Petrauskienė, Pranas Šerpytis, Aleksandras Laucevičius, Amir Lerman
AIM: To systematically review currently available cardiac shock-wave therapy (CSWT) studies in humans and perform meta-analysis regarding anti-anginal efficacy of CSWT. METHODS: The Cochrane Controlled Trials Register, Medline, Medscape, Research Gate, Science Direct, and Web of Science databases were explored. In total 39 studies evaluating the efficacy of CSWT in patients with stable angina were identified including single arm, non- and randomized trials. Information on study design, subject's characteristics, clinical data and endpoints were obtained...
April 12, 2017: Cardiovascular Ultrasound
https://www.readbyqxmd.com/read/28403504/extracorporeal-shock-wave-lithotripsy-is-safe-and-effective-for-pediatric-patients-with-chronic-pancreatitis
#11
Dan Wang, Ya-Wei Bi, Jun-Tao Ji, Lei Xin, Jun Pan, Zhuan Liao, Ting-Ting Du, Jin-Huan Lin, Di Zhang, Xiang-Peng Zeng, Bo Ye, Wen-Bin Zou, Hui Chen, Ting Xie, Bai-Rong Li, Zhao-Hong Zheng, Zhao-Shen Li, Liang-Hao Hu
Background and aims Pancreatic extracorporeal shock wave lithotripsy (P-ESWL) is recommended as the first-line treatment for pancreatic stones. However, how well P-ESWL performs in pediatric patients remains unclear. We aimed to evaluate the safety and efficacy of P-ESWL for pediatric patients with chronic pancreatitis. Methods This prospective observational study was conducted in patients with painful chronic pancreatitis who underwent P-ESWL. Patients aged under 18 years were included in the pediatric group; patients aged over 18 years who underwent P-ESWL in the same period were assigned to the control group...
April 12, 2017: Endoscopy
https://www.readbyqxmd.com/read/28403111/extracorporeal-shock-wave-therapy-is-effective-in-treating-chronic-plantar-fasciitis-a-meta-analysis-of-rcts
#12
Jiale Sun, Fuqiang Gao, Yanhua Wang, Wei Sun, Baoguo Jiang, Zirong Li
BACKGROUND: Plantar fasciitis (PF) is the most common reason for heel pain. The efficacy of extracorporeal shock wave therapy (ESWT) as an ideal alternative to conservative treatments and surgery is controversial, and almost all previous articles compared general ESWT with placebo without indicating the kind of shock wave. We undertook a meta-analysis to compare the efficacy of general ESWT, focused shock wave (FSW), and radial shock wave (RSW) with placebo, to assess their effectiveness in chronic PF...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28396695/a-new-patient-safety-smartphone-application-for-prevention-of-forgotten-ureteral-stents-results-from-a-clinical-pilot-study-in-194-patients
#13
Wilson R Molina, Rodrigo Pessoa, Rodrigo Donalisio da Silva, McCabe C Kenny, Diedra Gustafson, Leticia Nogueira, Mark E Leo, Michael K Yu, Fernando J Kim
BACKGROUND: Approximately 12% of all ureteral stents placed are retained or "forgotten." Forgotten stents are associated with significant safety concerns as well as increased costs and legal issues. Retained ureteral stents (RUS) often occur due to lack of clinical follow-up, communication or language barriers, and economic concerns. METHODS: We describe a multiplatform application that facilitates data collection to prevent RUS. The "Stent Tracker" application can be installed on mobile devices and computers...
2017: Patient Safety in Surgery
https://www.readbyqxmd.com/read/28395022/optogenetic-manipulation-of-anatomical-re-entry-by-light-guided-generation-of-a-reversible-local-conduction-block
#14
Masaya Watanabe, Iolanda Feola, Rupamanjari Majumder, Wanchana Jangsangthong, Alexander S Teplenin, Dirk L Ypey, Martin J Schalij, Katja Zeppenfeld, Antoine A F de Vries, Daniël A Pijnappels
Aims: Anatomical re-entry is an important mechanism of ventricular tachycardia, characterized by circular electrical propagation in a fixed pathway. It's current investigative and therapeutic approaches are non-biological, rather unspecific (drugs), traumatizing (electrical shocks), or irreversible (ablation). Optogenetics is a new biological technique that allows reversible modulation of electrical function with unmatched spatiotemporal precision using light-gated ion channels. We therefore investigated optogenetic manipulation of anatomical re-entry in ventricular cardiac tissue...
March 1, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28392115/small-calibre-percutaneous-nephrolithotomy-sc-pcnl-therapeutic-decision-algorithm
#15
J H Amón Sesmero, M Cepeda Delgado, B de la Cruz Martín, J A Mainez Rodriguez, D Alonso Fernández, V Rodriguez Tesedo, D A Martín Way, J Gutiérrez Aceves
INTRODUCTION: The progressive reduction in the calibre of the tract in percutaneous kidney surgery to the point of miniaturisation has expanded its use to smaller stones that until now have been treated with extracorporeal shock wave lithotripsy (ESWL) and retrograde intrarenal surgery (RIRS). OBJECTIVE: To provide an update on the various techniques of small-calibre nephrolithotomy (SC-PCNL) analyse their efficacy, safety and indications and determine their degree of implantation at this time...
April 6, 2017: Actas Urologicas Españolas
https://www.readbyqxmd.com/read/28386891/energy-water-food-nexus-under-financial-constraint-environment-good-the-bad-and-the-ugly-sustainability-reforms-in-sub-saharan-african-countries
#16
Khalid Zaman, Sadaf Shamsuddin, Mehboob Ahmad
Environmental sustainability agenda are generally compromised by energy, water, and food production resources, while in the recent waves of global financial crisis, it mediates to increase the intensity of air pollutants, which largely affected the less developing countries due to their ease of environmental regulation policies and lack of optimal utilization of economic resources. Sub-Saharan African (SSA) countries are no exception that majorly hit by the recent global financial crisis, which affected the country's natural environment through the channel of unsustainable energy-water-food production...
April 6, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28386415/a-non-conventional-discontinuous-lagrangian-for-viscous-flow
#17
M Scholle, F Marner
Drawing an analogy with quantum mechanics, a new Lagrangian is proposed for a variational formulation of the Navier-Stokes equations which to-date has remained elusive. A key feature is that the resulting Lagrangian is discontinuous in nature, posing additional challenges apropos the mathematical treatment of the related variational problem, all of which are resolvable. In addition to extending Lagrange's formalism to problems involving discontinuous behaviour, it is demonstrated that the associated equations of motion can self-consistently be interpreted within the framework of thermodynamics beyond local equilibrium, with the limiting case recovering the classical Navier-Stokes equations...
February 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28379665/short-term-efficacy-and-safety-of-low-intensity-extracorporeal-shock-wave-therapy-in-erectile-dysfunction-a-systematic-review-and-meta-analysis
#18
Zi-Jun Zou, Liang-You Tang, Zhi-Hong Liu, Jia-Yu Liang, Ruo-Chen Zhang, Yu-Jie Wang, Yong-Quan Tang, Rui Gao, Yi-Ping Lu
AIM: The role of low-intensity extracorporeal shock wave therapy (LI-ESWT) in erectile dysfunction (ED) is not clearly determined. The purpose of this study is to investigate the short-term efficacy and safety of LI-ESWT for ED patients. MATERIALS AND METHODS: Relevant studies were searched in Medline, Embase, Cochrane Library, China National Knowledge Infrastructure (CNKI), WANFANG and VIP databases. Effective rate in terms of International Index of Erectile Function-Erectile Function Domain (IIEF-EF) and Erectile Hardness Score (EHS) at about 1month after LI-ESWT was extracted from eligible studies for meta-analysis to calculate risk ratio (RR) of effective treatment in ED patients treated by LI-ESWT compared to those receiving sham-treatment...
April 6, 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
https://www.readbyqxmd.com/read/28372408/a-compact-fiber-optics-based-heterodyne-combined-normal-and-transverse-displacement-interferometer
#19
Bryan Zuanetti, Tianxue Wang, Vikas Prakash
While Photonic Doppler Velocimetry (PDV) has become a common diagnostic tool for the measurement of normal component of particle motion in shock wave experiments, this technique has not yet been modified for the measurement of combined normal and transverse motion, as needed in oblique plate impact experiments. In this paper, we discuss the design and implementation of a compact fiber-optics-based heterodyne combined normal and transverse displacement interferometer. Like the standard PDV, this diagnostic tool is assembled using commercially available telecommunications hardware and uses a 1550 nm wavelength 2 W fiber-coupled laser, an optical focuser, and single mode fibers to transport light to and from the target...
March 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28372105/covert-cavitation-spectral-peak-suppression-in-the-acoustic-emissions-from-spatially-configured-nucleations
#20
Jae Hee Song, Kristoffer Johansen, Paul Prentice
Dual laser-nucleation is used to precisely configure two cavitation bubbles within a focused ultrasound field of f0 = 692 kHz, in proximity to the tip of a needle hydrophone. With both bubbles responding in the f0/2 sub-harmonic regime, confirmed via ultra-high speed shadowgraphic imaging, an emission spectrum with no sub-harmonic content is demonstrated, for an inter-bubble spacing ≈λ0. A spectral model for periodic shock waves from multiple nucleations demonstrates peak suppressions at nf0/2 when applied to the experiment, via a windowing effect in the frequency domain...
March 2017: Journal of the Acoustical Society of America
keyword
keyword
2385
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"