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https://www.readbyqxmd.com/read/28727738/propagation-characteristics-of-pulverized-coal-and-gas-two-phase-flow-during-an-outburst
#1
Aitao Zhou, Kai Wang, Lingpeng Fan, Bo Tao
Coal and gas outbursts are dynamic failures that can involve the ejection of thousands tons of pulverized coal, as well as considerable volumes of gas, into a limited working space within a short period. The two-phase flow of gas and pulverized coal that occurs during an outburst can lead to fatalities and destroy underground equipment. This article examines the interaction mechanism between pulverized coal and gas flow. Based on the role of gas expansion energy in the development stage of outbursts, a numerical simulation method is proposed for investigating the propagation characteristics of the two-phase flow...
2017: PloS One
https://www.readbyqxmd.com/read/28727384/a-neural-network-based-algorithm-for-predicting-stone-free-status-after-eswl-therapy
#2
Ilker Seckiner, Serap Seckiner, Haluk Sen, Omer Bayrak, Kazim Dogan, Sakip Erturhan
OBJECTIVE: The prototype artificial neural network (ANN) model was developed using data from patients with renal stone, in order to predict stone-free status and to help in planning treatment with Extracorporeal Shock Wave Lithotripsy (ESWL) for kidney stones. MATERIALS AND METHODS: Data were collected from the 203 patients including gender, single or multiple nature of the stone, location of the stone, infundibulopelvic angle primary or secondary nature of the stone, status of hydronephrosis, stone size after ESWL, age, size, skin to stone distance, stone density and creatinine, for eleven variables...
July 20, 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
https://www.readbyqxmd.com/read/28727383/outcomes-of-miniaturized-percutaneous-nephrolitotomy-in-infants-single-centre-experience
#3
Eyyup Sabri Pelit, Bülent Kati, Cengiz Çanakci, Süleyman Sağir, Halil Çiftçi
OBJECTIVES: The present study was aim to evaluate the safety and efficacy of Mini-PNL to treat kidney stones in patients aged <3 years. This is the one of the largest series in the literature in this age group of patients. MATERIAL AND METHODS: From May 2012 to April 2016, the medical records of 74 infant patients who underwent mini-PNL for renal stones were reviewed retrospectively. All infants were evaluated with the plain abdominal radiograph, urinary ultrasound, noncontrast computerized tomography and/or intravenous urogram...
July 20, 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
https://www.readbyqxmd.com/read/28726571/primary-blast-causes-delayed-effects-without-cell-death-in-shell-encased-brain-cell-aggregates
#4
Thomas Sawyer, Yushan Wang, David V Ritzel, Tyson Josey, Mercy Villanueva, Cory Vair, Yanfeng Song, Yimin Shei, Steven Parks, Peggy Nelson, Grant Hennes, Lori McLaws, Changyan Fan
Previous work used underwater explosive exposures to isolate the effects of shock-induced principle stress without shear on rat brain aggregate cultures. This current study has utilized simulated air blast to expose aggregates in suspension and enclosed within a spherical shell, enabling the examination of a much more complex biomechanical insult. Culture medium-filled spheres were exposed to single pulse overpressures of 15-30 psi (6-7 msec duration) and measurements within the sphere at defined sites showed complex and spatially dependent pressure changes...
July 20, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28717623/chondrocytes-treated-with-different-shock-wave-devices
#5
Angela Notarnicola, Florenzo Iannone, Giuseppe Maccagnano, Nuniza Lacarpia, Dorotea Bizzoca, Biagio Moretti
BACKGROUND: Shock wave treatment is used for several orthopedic diseases and there are different devices available. Until now, there have been no experimental studies on the effects of these different generators. METHODS: We carried out an experimental study to compare the effects of three focused generators (electro-magnetic, piezoelectric and electro-hydraulic) as well as a radial generator on healthy and osteoarthritis chondrocytes. RESULTS: By the analysis of our results, we may exclude significant differences between the different generators, even though there is a greater action specificity for electro-magnetic and piezoelectric generators...
January 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/28717617/conservative-treatment-for-insertional-achilles-tendinopathy-platelet-rich-plasma-and-focused-shock-waves-a-retrospective-study
#6
Davide Erroi, Matilde Sigona, Tania Suarez, Donatella Trischitta, Antonio Pavan, Maria Chiara Vulpiani, Mario Vetrano
BACKGROUND: Insertional Achilles tendinopathy (IAT) represents a serious challenge for both physiatrists and surgeons. Here we analyse the results obtained by two conservative treatments [platelet-rich plasma (PRP) injections and focused extracorporeal shock-wave therapy (ESWT)] in physically active patients with IAT. METHODS: During two consecutive periods, 45 consecutive patients with IAT were treated with 3 sessions of ESWT (2400 impulses at 0.17-0.25 mJ/mm(2) per session) (24 cases between September 2011 and July 2013) or with 2 autologous PRP injections over two weeks (21 cases between September 2013 and July 2015)...
January 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/28717540/totally-tubeless-percutaneous-nephrolithotomy-is-feasible-in-morbidly-obese-patients
#7
Seyed Mohammad Kazem Aghamir, Mohammad Ghasem Mohseni, Seyed Reza Hosseini, Alborz Salavati, Hossein Ganjali, Mohammad Ali Fallah, Hamed Rezaei, Seyed Saeed Modaresi
OBJECTIVE: Regarding technical difficulties that obese body habitus might impose to percutaneous nephrolithotomy (PNL) success and higher risk of peri-operative complications in this group of patients, we decided to retrospectively gather data from our patients during past 8 years to determine the stone free and complication rates. MATERIAL AND METHODS: Between January 2007-December 2015, seventy-eight obese patients with body mass index over 35 who had indication for PNL including stones larger than 2 cm in pelvi-calyceal system or smaller extracorporeal shock wave lithotripsy (ESWL) resistant stones or who were not a fit candidate for ESWL due to increased skin to target distance, with no contraindication of PNL (including bleeding diathesis, inability to be positioned in prone) were enrolled...
June 2017: Turkish Journal of Urology
https://www.readbyqxmd.com/read/28717534/effect-of-low-energy-shockwave-therapy-on-angiogenic-factors-in-the-penile-tissue-of-diabetic-rats
#8
Mazhar Ortaç, Canan Küçükergin, Emre Salabaş, Şule Seçkin, Ateş Kadıoğlu
OBJECTIVE: The aim of this study is to investigate the effect of low-energy shock wave therapy (LESWT) on angiogenesis factors at penile tissue in a diabetic rat model. MATERIAL AND METHODS: A total of 30 male Sprague-Dawley rats which were allocated into three equal groups were included study. Group 1 (control group) included 10 male rats which did not receive any treatment were randomly chosen to serve as normal control. The remaining rats were injected intraperitoneally with 60 mg/kg of streptozotocin (STZ) to induce diabetes...
June 2017: Turkish Journal of Urology
https://www.readbyqxmd.com/read/28717532/retrograde-intrarenal-surgery-for-renal-stones-part-1
#9
REVIEW
Ben Van Cleynenbreugel, Özcan Kılıç, Murat Akand
The main aim in the treatment of renal stones is to clearance of the stones completely with the least morbidity. Parallel to the improvements in technology during recent years, new flexible ureterorenoscopes and effective lithotripters such as holmium laser have been developed, thus retrograde intrarenal surgery (RIRS) has become an efficient and safe option in the management of urinary system stone disease with a gradually increasing popularity. Therewithal, innovations in auxiliary equipment such as guide-wires, ureteral access sheath and stone baskets have made this procedure more effective...
June 2017: Turkish Journal of Urology
https://www.readbyqxmd.com/read/28713101/-extracorporeal-shock-waves-esw-as-an-alternative-treatment-method-for-improving-the-limb-muscles-spasticity-after-cerebral-stroke-a-systematic-review-of-the-literature
#10
Robert Dymarek, Kuba Ptaszkowski, Lucyna Słupska, Małgorzata Paprocka-Borowicz, Jakub Taradaj, Tomasz Halski, Joanna Rosińczuk
Extracorporeal shock wave (ESW) is a physical factor, of which the clinical use is observed in a wide range of disorders, particularly musculoskeletal dysfunctions. Recently, one can observe that the list of indications for ESW treatment is continuously growing and adapting the increasingly different systemic diseases in terms of etiology and pathomechanism. Nevertheless, it should be remembered that the potential biological mechanisms of ESW stimulation conditioning advantageous and desirable therapeutic effects are not clearly explained...
2017: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/28709273/laser-driven-shock-waves-studied-by-x-ray-radiography
#11
L Antonelli, S Atzeni, A Schiavi, S D Baton, E Brambrink, M Koenig, C Rousseaux, M Richetta, D Batani, P Forestier-Colleoni, E Le Bel, Y Maheut, T Nguyen-Bui, X Ribeyre, J Trela
Multimegabar laser-driven shock waves are unique tools for studying matter under extreme conditions. Accurate characterization of shocked matter is for instance necessary for measurements of equation of state data or opacities. This paper reports experiments performed at the LULI facility on the diagnosis of shock waves, using x-ray-absorption radiography. Radiographs are analyzed using standard Abel inversion. In addition, synthetic radiographs, which also take into account the finite size of the x-ray source, are generated using density maps produced by hydrodynamic simulations...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28709201/electrohydrodynamic-instability-of-ion-concentration-shock-wave-in-electrophoresis
#12
Rahul Gaur, Supreet Singh Bahga
Capillary electrophoresis techniques often involve ion-concentration shock waves in an electrolyte solution, propagating under the effect of an external electric field. These shock waves are characterized by self-sharpening gradients in ion concentrations and electrical conductivity that are collinear with the electric field. The coupling of electric field and fluid motion at the shock interface sometimes leads to an undesirable electrohydrodynamic (EHD) instability. Using linear stability analysis, we describe the motion of small-amplitude disturbances of an electrophoretic shock wave...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28708705/ultrasound-guidance-does-not-improve-the-results-of-shock-wave-for-plantar-fasciitis-or-calcific-achilles-tendinopathy-a-randomized-control-trial
#13
Masiiwa M Njawaya, Bassam Moses, David Martens, Jessica J Orchard, Tim Driscoll, John Negrine, John W Orchard
OBJECTIVE: To establish whether the use of ultrasound to direct shock waves to the area of greater calcification in calcaneal enthesopathies was more effective than the common procedure of directing shock waves to the point where the patient has the most tenderness. DESIGN: Two-armed nonblinded randomized control trial with allocation concealment. SETTING: The Sports Clinic at Sydney University. PATIENTS: Participants 18 years or older with symptomatic plantar fasciitis (PF) (with heel spur) or calcific Achilles tendinopathy (CAT)...
July 11, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28706307/effect-of-shock-induced-cavitation-bubble-collapse-on-the-damage-in-the-simulated-perineuronal-net-of-the-brain
#14
Yuan-Ting Wu, Ashfaq Adnan
The purpose of this study is to conduct modeling and simulation to understand the effect of shock-induced mechanical loading, in the form of cavitation bubble collapse, on damage to the brain's perineuronal nets (PNNs). It is known that high-energy implosion due to cavitation collapse is responsible for corrosion or surface damage in many mechanical devices. In this case, cavitation refers to the bubble created by pressure drop. The presence of a similar damage mechanism in biophysical systems has long being suspected but not well-explored...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28702844/influence-of-acetylsalicylic-acid-and-low-molecular-weight-heparins-on-the-formation-of-renal-hematoma-after-shock-wave-lithotripsy
#15
Christoph Schregel, Hubert John, Marco Randazzo, Isabelle Keller
PURPOSE: To investigate the risk of renal hematoma (RHT) after shock wave lithotripsy (SWL) among patients on acetylsalicylic acid (ASA) or low-molecular-weight heparin (LMWH). PATIENTS AND METHODS: Retrospective analysis of 434 patients treated with SWL for nephrolithiasis and ureterolithiasis of the proximal ureter. Primary endpoint was detection of RHT by ultrasound the day after SWL. Secondary outcome variables included transfusion of erythrocyte concentrate(s), interventions, hospital readmission or death due to RHT within 30 days of SWL...
July 12, 2017: World Journal of Urology
https://www.readbyqxmd.com/read/28697638/the-effect-of-swl-and-urs-on-health-related-quality-of-life-in-proximal-ureteral-stones
#16
Yasin Ceylan, Oktay Ucer, Ozan Bozkurt, Bulent Gunlusoy, Oguz Mertoglu, Ali Ersin Zumrutbas, Guner Yildiz, Bora Irer, Talha Muezzinoglu, Omer Demir
OBJECTIVES: We aimed to compare the effect of shock wave lithotripsy (SWL) and ureteroscopic lithotripsy (URS) on health-related quality of life (HRQoL) for the treatment of proximal ureteral stones. MATERIAL AND METHODS: Between April 2014 and July 2015, patients with proximal ureteral stones who were successfully treated with URS or SWL in seven different centers were included. Patients were divided into two groups according to stone size: stones ≤10 mm and >10 mm...
July 12, 2017: Minimally Invasive Therapy & Allied Technologies: MITAT
https://www.readbyqxmd.com/read/28697536/potential-applications-of-low-energy-shock-waves-in-functional-urology
#17
REVIEW
Hung-Jen Wang, Jai-Hong Cheng, Yao-Chi Chuang
A shock wave, which carries energy and can propagate through a medium, is a type of continuous transmitted sonic wave with a frequency of 16 Hz-20 MHz. It is accompanied by processes involving rapid energy transformations. The energy associated with shock waves has been harnessed and used for various applications in medical science. High-energy extracorporeal shock wave therapy is the most successful application of shock waves, and has been used to disintegrate urolithiasis for 30 years. At lower energy levels, however, shock waves have enhanced expression of vascular endothelial growth factor, endothelial nitric oxide synthase, proliferating cell nuclear antigen, chemoattractant factors and recruitment of progenitor cells; shock waves have also improved tissue regeneration...
July 11, 2017: International Journal of Urology: Official Journal of the Japanese Urological Association
https://www.readbyqxmd.com/read/28696752/dispersive-dam-break-flow-of-a-photon-fluid
#18
Gang Xu, Matteo Conforti, Alexandre Kudlinski, Arnaud Mussot, Stefano Trillo
We investigate the temporal photonic analogue of the dam-break phenomenon for shallow water by exploiting a fiber optics setup. We clearly observe the decay of the steplike input (photonic dam) into a pair of oppositely propagating rarefaction wave and dispersive shock wave. Our results show evidence for a critical transition of the dispersive shock into a self-cavitating state. The detailed observation of the cavitating state dynamics allows for a fully quantitative test of the Whitham modulation theory applied to the universal defocusing nonlinear Schrödinger equation...
June 23, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28694394/assessment-of-electrocardiographic-parameters-in-adult-patients-undergoing-extracorporeal-shockwave-lithotripsy
#19
Gündüz Durmuş, Muhsin Kalyoncuoğlu, Mehmet Baran Karataş, Yiğit Çanga, Semi Öztürk, Ender Özal, Yasin Çakıllı, Tuncay Kırış, Barış Güngör, Ahmet Taha Alper, Mehmet Mustafa Can, Osman Bolca
OBJECTIVE: Extracorporeal shock wave lithotripsy (ESWL) is a safe and effective treatment for urinary tract calculi. While serious side effects are rare, transient cardiac arrhythmias may occur. New electrocardiographic (ECG) parameters, such as P wave dispersion (PWD), QT dispersion (QTd), T peak to T end (Tp-e) interval, Tp-e interval/QT ratio, and Tp-e interval/corrected QT ratio have been defined to help predict atrial and ventricular arrhythmias. However, effect of ESWL on these ECG parameters has not been previously investigated...
July 2017: Türk Kardiyoloji Derneği Arşivi: Türk Kardiyoloji Derneğinin Yayın Organıdır
https://www.readbyqxmd.com/read/28692592/reduction-in-temporary-and-permanent-audiological-injury-through-internal-jugular-vein-compression-in-a-rodent-blast-injury-model
#20
Brian Sindelar, Michael Shinners, Sydney Sherman, Kristine Erickson, Vimal Patel, Paul Kubilis, John D Finan, Julian E Bailes
HYPOTHESIS: Internal jugular vein (IJV) compression influences not only intracranial but also intracochlear physiology and has demonstrated preclinical effectiveness in reducing acute audiological injury in a rodent blast model. However, the long-term effects in this model are unknown. BACKGROUND: Blast wave-induced audiological injury from an improvised explosive device is a leading cause of morbidity among service members in theater but there are limitations to the current protective measures...
July 7, 2017: Otology & Neurotology
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