نتایج جستجو برای: pressurization

تعداد نتایج: 974  

2011
Nitesh Pratap Rakesh Kalapala Santosh Darisetty Nitin Joshi Mohan Ramchandani Rupa Banerjee Sandeep Lakhtakia Rajesh Gupta Manu Tandan G V Rao D Nageshwar Reddy

BACKGROUND/AIMS High-resolution manometry (HRM) with pressure topography is used to subtype achalasia cardia, which has therapeutic implications. The aim of this study was to compare the clinical characteristics, manometric variables and treatment outcomes among the achalasia subtypes based on the HRM findings. METHODS The patients who underwent HRM at the Asian Institute of Gastroenterology,...

Journal: :Osteoarthritis and cartilage 2009
M Caligaris C E Canal C S Ahmad T R Gardner G A Ateshian

OBJECTIVE This study tests the hypothesis that the natural progression of osteoarthritis (OA) in human joints leads to an increase in the friction coefficient. This hypothesis is based on the expectation that the wear observed in OA may be exacerbated by higher friction coefficients. A corollary hypothesis is that healthy synovial fluid (SF) may help mitigate the increase in the friction coeffi...

Journal: :American journal of physiology. Renal physiology 2004
Zhong Zhang Thomas L Pallone

We tested whether luminal perfusion and pressurization induce an endothelial cytoplasmic Ca(2+) ([Ca(2+)](CYT)) response in descending vasa recta (DVR). DVR isolated from the rat outer medulla were cannulated and subjected to free-flow microperfusion (5 nl/min); the onset of which increased [Ca(2+)](CYT) from a baseline of 76 +/- 13 to 221 +/- 65 nM. A graded increase in luminal pressure from 0...

Journal: :Biomacromolecules 2001
D R Picout S B Ross-Murphy N Errington S E Harding

To reduce time-dependent aggregation phenomena and achieve true "molecular" solution, the "pressure cell" solubilization method of Vorwerg and co-workers was applied to solutions of guar galactomannans (three samples of different molecular weights), using various heating, time, and pressure profiles. Physicochemical characterization of the guar samples before and after pressure cell treatment i...

2014
Cheng-Hsien Chen Chung-Yi Cheng Yen-Cheng Chen Yuh-Mou Sue Chung-Te Liu Tzu-Hurng Cheng Yung-Ho Hsu Tso-Hsiao Chen

Epithelial-mesenchymal transition (EMT) occurs in stressed tubular epithelial cells, contributing to renal fibrosis. Initial mechanisms promoting EMT are unknown. Pressure force is an important mechanism contributing to the induction and progression of renal fibrogenesis in ureteric obstruction. In our study of cultured rat renal tubular cells (NRK-52E) under 60 mmHg of pressure, we found that ...

Journal: :Journal of biomechanical engineering 2012
M Kazemi L P Li M D Buschmann P Savard

Partial meniscectomy is believed to change the biomechanics of the knee joint through alterations in the contact of articular cartilages and menisci. Although fluid pressure plays an important role in the load support mechanism of the knee, the fluid pressurization in the cartilages and menisci has been ignored in the finite element studies of the mechanics of meniscectomy. In the present study...

Journal: :Journal of biomechanics 2013
Veronica Rotemberg Brett Byram Mark Palmeri Michael Wang Kathryn Nightingale

Elevated hepatic venous pressure is the primary source of complications in advancing liver disease. Ultrasound imaging is ideal for potential noninvasive hepatic pressure measurements as it is widely used for liver imaging. Specifically, ultrasound based stiffness measures may be useful for clinically monitoring pressure, but the mechanism by which liver stiffness increases with hepatic pressur...

2012
RU ZHOU WEI ZHANG

In high-rise building fire, a large amount of fresh air will be pressurized into the fire floor when smoke ventilation and prevention system is used. The fresh air dilutes the smoke, but it also reduces the efficiency of mechanical exhaust. The assumption that vertical composition smoke control model (air curtain combined with pressurization and exhaust fan) is put forward. The mathematic model...

Journal: :Respiratory care 2013
José M Alonso-Iñigo Amadeo Almela Alejandro Albert José M Carratalá María J Fas

OBJECTIVE To carry out an in vitro study of Boussignac CPAP valve performance with a new humidification method, using a heated humidifier. METHODS Two heated humidifiers were evaluated: Fisher & Paykel MR850, and Covidien Kendall Aerodyne 2000. Baseline measurements were taken in all experimental conditions without humidification. The Boussignac valve was adapted to the input of the humidific...

Journal: :Journal of physics 2023

Abstract Through the functional disassembly study of pressurization system, vacuum and atmosphere control water cooling system SPS spark plasma equipment, problems in actual production process corresponding improvements sintering (SPS) equipment are also discussed. The shortcomings its development directions proposed to provide sufficient data support for subsequent research.

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