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Hollow viscous

Hai-Long Zhang, Yi-Fan Zhu, Bin Liang, Jing Yang, Jun Yang, Jian-Chun Cheng
Suppression of the transmission of undesired sound in ducts is a fundamental issue with wide applications in a great variety of scenarios. Yet the conventional ways of duct noise control have to rely on mismatched impedance or viscous dissipation, leading the ducts to have ventilation capability weakened by inserted absorbers or a thick shell to accommodate bulky resonators. Here we present a mechanism for insulating sound transmission in a hollow pipe with subwavelength thickness, by directly reversing its propagating direction via anomalous reflection at the flat inner boundary with well-designed phase profile...
March 8, 2017: Scientific Reports
Arturo Nicola Natali, Emanuele Luigi Carniel, Alessandro Frigo, Chiara Giulia Fontanella, Alessandro Rubini, Yochai Avital, Giulia Maria De Benedictis
BACKGROUND AND OBJECTIVE: An integrated experimental and computational investigation was developed aiming to provide a methodology for characterizing the structural response of the urethral duct. The investigation provides information that are suitable for the actual comprehension of lower urinary tract mechanical functionality and the optimal design of prosthetic devices. METHODS: Experimental activity entailed the execution of inflation tests performed on segments of horse penile urethras from both proximal and distal regions...
April 2017: Computer Methods and Programs in Biomedicine
Reimer Andresen, Sebastian Radmer, Julian Ramin Andresen, Hans-Christof Schober
PURPOSE: The objective of this prospective, randomised study was to examine the feasibility and clinical outcome of balloon sacroplasty and radiofrequency sacroplasty. METHODS: In 40 patients with a total of 57 sacral fractures, CT-guided cement augmentation was performed by means of BSP or RFS. For BSP, the balloon catheter was inflated and deflated in the fracture zone, and the hollow space, thus, created was then filled with PMMA cement. For RFS, the spongious space in the fracture zone was initially extended using a flexible osteotome, and the highly viscous PMMA cement, activated by radiofrequency, was then inserted into the prepared fracture zone...
January 9, 2017: European Spine Journal
Jessica A Zagory, Avafia Dossa, Jamie Golden, Aaron R Jensen, Catherine J Goodhue, Jeffrey S Upperman, Christopher P Gayer
PURPOSE: Current guidelines for computed tomography (CT) after blunt trauma were developed to capture all intra-abdominal injuries (IAI). We hypothesize that current AST/ALT guidelines are too low leading to unnecessary CT scans for children after blunt abdominal trauma (BAT). METHODS: Patients who received CT of the abdomen after blunt trauma at our Level I Pediatric Trauma Center were stratified into a high risk (HR) (liver/spleen/kidney grade ≥III, hollow viscous, or pancreatic injuries) and low risk (LR) (liver/kidney/spleen injuries grade ≤II, or no IAI) groups...
November 23, 2016: Pediatric Surgery International
Maddibande Ramachar Sreevathsa, Khyati Melanta
INTRODUCTION: The most common cause of gas under diaphragm is hollow viscous perforation. In 10% of cases it can be due to rare causes, both abdominal and extra-abdominal, one of them being intra abdominal infection by gas forming organisms. PRESENTATION OF THE CASE: A 51 year old male patient, a poorly controlled diabetic, presented with a second episode of severe pain abdomen and abdominal distention, with lower abdominal tenderness. Plain Xray of the abdomen in erect posture showed gas under the right dome of diaphragm and ultrasound abdomen confirmed gross pneumoperitoneum...
October 14, 2016: International Journal of Surgery Case Reports
Shannon E Weigum, Lichen Xiang, Erica Osta, Linying Li, Gabriel P López
Separation of cells and microorganisms from complex biological mixtures is a critical first step in many analytical applications ranging from clinical diagnostics to environmental monitoring for food and waterborne contaminants. Yet, existing techniques for cell separation are plagued by high reagent and/or instrumentation costs that limit their use in many remote or resource-poor settings, such as field clinics or developing countries. We developed an innovative approach to isolate infectious pathogens from biological fluids using buoyant hollow silica microspheres that function as "molecular buoys" for affinity-based target capture and separation by floatation...
September 30, 2016: Journal of Chromatography. A
Dirk Schmelter, Horst Hintze-Bruening
Graphene oxide (GO) dispersed in water has been combined with a mixture of aqueous polymer dispersions and melamine formaldehyde resin (MF). Stable low viscous fluids with no obvious signs of mesoscale ordering at 0.3 wt % yield transparent films with GO loadings up to one weight percent in the form of homogeneously aligned double strands, each comprising few individual layers of the carbon allotrope. While baking of the films at 160 °C results in minor thermal reduction of GO, in situ reduction with excess hydroxylamine (HA) in the presence of the polymer colloids yields stable dispersions in which amphiphilic graphene like flakes temporarily encapsulate gaseous reaction products...
June 29, 2016: ACS Applied Materials & Interfaces
Nick A Nash, Obi Okoye, Ozgur Albuz, Kelly N Vogt, Efstathios Karamanos, Kenji Inaba, Demetrios Demetriades
We sought to use the National Trauma Databank to determine the demographics, injury distribution, associated abdominal injuries, and outcomes of those patients who are restrained versus unrestrained. All victims of motor vehicle collisions (MVCs) were identified from the National Trauma Databank and stratified into subpopulations depending on the use of seat belts. A total of 150,161 MVC victims were included in this study, 72,394 (48%) were belted. Young, male passengers were the least likely to be wearing a seat belt...
February 2016: American Surgeon
Shalv P Madhani, Brandon D D'Aloiso, Brian Frankowski, William J Federspiel
Hollow fiber membranes (HFMs) are used in blood oxygenators for cardiopulmonary bypass or in next generation artificial lungs. Flow analyses of these devices is typically done using computational fluid dynamics (CFD) modeling HFM bundles as porous media, using a Darcy permeability coefficient estimated from the Blake-Kozeny (BK) equation to account for viscous drag from fibers. We recently published how well this approach can predict Darcy permeability for fiber bundles made from polypropylene HFMs, showing the prediction can be significantly improved using an experimentally derived correlation between the BK constant (A) and bundle porosity (ε)...
May 2016: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
Ahmed Boachie, Edigna Kusi Appiah, Michelle Jubin, Karin Jasper
This case report describes five independent cases of children and adolescents assessed for eating disorders who disclosed using the Heimlich maneuver as a purging technique. The maneuver is meant to be used only in life or death situations, likely once or less in any person's lifetime. A child or adolescent with an eating disorder may be using it to self-induce vomiting on a daily basis, increasing the risk of complications, including potential damage to major organs of the body. Asking patients who purge to elaborate on the methods with which they purge can provide clinicians with fuller information, improving their ability to select appropriate medical tests and interventions...
September 2015: International Journal of Eating Disorders
G T Jasion, J S Shrimpton, Y Chen, T Bradley, D J Richardson, F Poletti
We propose a new method to accurately model the structural evolution of a microstructured fiber (MOF) during its drawing process, given its initial preform structure and draw conditions. The method, applicable to a broad range of MOFs with high air-filling fraction and thin glass membranes, is an extension of the Discrete Element Method; it determines forces on the nodes in the microstructure to progressively update their position along the neck-down region, until the fiber reaches a final frozen state. The model is validated through simulation of 6 Hollow Core Photonic Band Gap Fibers (HC-PBGFs) and is shown to predict accurately the final fiber dimensions and cross-sectional distortions...
January 12, 2015: Optics Express
Timothy P Plackett, Mohammad Naeem
Combat medical care results in limited resource availability, which can prompt creativity in treatment of otherwise common conditions. A postoperative intra-abdominal abscess is not an uncommon occurrence following traumatic hollow viscous injury in the deployed environment, but treatment is often limited to surgical drainage only. Herein, we describe a novel use of a dual-lumen central venous catheter to obtain percutaneous drainage of a postoperative intra-abdominal abscess.
March 2015: Military Medicine
Mohammad Alassaf
INTRODUCTION: Pneumoperitoneum, observed by radiography, is typically associated with the perforation of hollow viscous. More than 90% of all cases of pneumoperitoneum are the result of a gastrointestinal tract perforation. These patients usually present with signs of acute peritonitis and require immediate surgical exploration and intervention. However, rare cases of idiopathic spontaneous pneumoperitoneum do occur without any indication of visceral perforation and other known causes of the free intraperitoneal gas...
2015: International Journal of Surgery Case Reports
Dominic A Borgialli, Angela M Ellison, Peter Ehrlich, Bema Bonsu, Jay Menaker, David H Wisner, Shireen Atabaki, Cody S Olsen, Peter E Sokolove, Kathy Lillis, Nathan Kuppermann, James F Holmes
OBJECTIVES: The objective was to determine the association between the abdominal seat belt sign and intra-abdominal injuries (IAIs) in children presenting to emergency departments with blunt torso trauma after motor vehicle collisions (MVCs). METHODS: This was a planned subgroup analysis of prospective data from a multicenter cohort study of children with blunt torso trauma after MVCs. Patient history and physical examination findings were documented before abdominal computed tomography (CT) or laparotomy...
November 2014: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
Reimer Andresen, Christopher Wilhelm Lüdtke, Sebastian Radmer, Peter Kamusella, Hans-Christof Schober
INTRODUCTION AND OBJECTIVE: In elderly patients with reduced bone quality, insufficiency fractures of the sacrum are relatively common and are typically accompanied by severe, disabling pain. The objective of this study was to evaluate the feasibility of cement augmentation by RFS, as well as to determine postinterventional leakages and present the patients' outcomes. MATERIAL AND METHOD: In 20 patients (18 women, 2 men) with an average age of 80.4 (65-92) years, a fracture of the sacrum was detected by CT and MRI...
April 2015: European Spine Journal
Tong Liu, Cong Ren, Shumin Fang, Yao Wang, Fanglin Chen
NiO-yttria-stabilized zirconia (YSZ) hollow fiber anode support with different microstructures was prepared using a phase-inversion method. The effect of the solid loading of the phase-inversion suspensions on the microstructure development of the NiO-YSZ anode support was investigated. Solid loading in the suspension was found to have an important influence on the microstructure of the NiO-YSZ anode support and viscosity-related viscous fingering mechanism can be adopted to explain the pore formation mechanism of the as-prepared hollow fibers...
November 12, 2014: ACS Applied Materials & Interfaces
Alireza Merrikhi, Hojatollah Raji Asadabadi, Ali Akbar Beigi, Sayed Mahdi Marashi, Hafez Ghaheri, Zohre Nasiri Zarch
UNLABELLED: Background This research compares the outcomes of percutaneous technique and open surgical peritoneal dialysis catheter placement in children. METHODS: In this randomized controlled trial, between 2010 and 2011,a total of 35 pediatric uremic patients were enrolled and randomized into two study groups. Follow up data included duration of operation (minute), duration of hospitalization (days) and onset time of peritoneal dialysis. Complications were considered as mechanical and infectious...
2014: Medical Journal of the Islamic Republic of Iran
Hanna Alemayehu, Kuojen Tsao, Mark L Wulkan, Saleem Islam, Robert T Russell, Todd A Ponsky, Daniel C Cullinane, Adam Alder, Shawn D St Peter, Corey W Iqbal
PURPOSE: Penetrating pancreatic injuries in children are uncommon and are not well described in the literature. We report a multi-institutional experience with penetrating pancreatic injuries in children. METHODS: A retrospective review of children sustaining penetrating pancreatic injuries was performed at eight pediatric trauma centers. RESULTS: Sixteen patients were identified. Eleven patients were male; (mean ± SE) age was 11.7 ± 1.2 years...
November 2014: Pediatric Surgery International
Jason W Smith, R Neal Garrison, Paul J Matheson, Brian G Harbrecht, Matthew V Benns, Glen A Franklin, Keith R Miller, Matthew C Bozeman, J David Richardson
BACKGROUND: The success of damage-control surgery (DCS) for the treatment of trauma has led to its use in other surgical problems such as abdominal sepsis. Previous studies using direct peritoneal resuscitation (DPR) for the treatment of trauma have yielded promising results. We present the results of the application of this technique to patients experiencing abdominal sepsis. METHODS: We enrolled 88 DCS patients during a 5 year-period (January 2008 to December 2012) into a propensity-matched study to evaluate the utility of using DPR in addition to standard resuscitation...
September 2014: Journal of Trauma and Acute Care Surgery
Edward Karpman, William O Brant, Bryan Kansas, Anthony J Bella, LeRoy A Jones, Elizabeth Eisenhart, Gerard Henry
PURPOSE: Alternative reservoir site placement has become an accepted technique for patients who require an inflatable penile prosthesis. To our knowledge there has been no prospective evaluation of this technique, which is currently off label. We performed a prospective, multicenter, multinational, internal review board approved study to evaluate the effectiveness and safety of alternative reservoir site placement. MATERIALS AND METHODS: PROPPER initiated in June 2011, is a database containing patient outcomes of inflatable penile prosthesis implantation...
January 2015: Journal of Urology
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