Results 261 to 270 of about 3,583,341 (309)

Pressure losses in grooved channels

Journal of Fluid Mechanics, 2013
AbstractThe effects of small-amplitude, two-dimensional grooves on pressure losses in a laminar channel flow have been analysed. Grooves with an arbitrary shape and an arbitrary orientation with respect to the flow direction have been considered. It has been demonstrated that losses can be expressed as a superposition of two parts, one associated with ...
Mohammadi, A., Floryan, J. M.
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Pressure losses across gravel packs

Journal of Petroleum Science and Engineering, 1991
Abstract An analytical solution is presented for laminar flow across a gravel pack. THe solution was obtained by solving the three-dimensional (3-D) diffusivity equation. This solution describes the divergent flow in the gravel-packed annulus between screen and casing. The solution is in the form of an infinite Fourier-Bessel series.
Turhan Yildiz, Julius P. Langlinais
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Noise-induced hearing loss and blood pressure

International Archives of Occupational and Environmental Health, 1979
A sample of 188 male and 92 female engineering industry workers was investigated. Pure-tone audiometric measurements were used as an estimator of prolonged noise exposure. Using the air conductance thresholds at frequencies of 3,4 and 6 kHz, subjects were classified into three hearing classes. Their systolic (SBP) and diastolic blood pressure (DBP) was
O, Manninen, S, Aro
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Loss-compensated photoelastic fiber optic pressure sensor

Applied Optics, 1989
A fiber optic pressure sensor based on the photoelastic effect has been set up in a four-port polariscope. The down lead insensitivity is achieved by application of the balanced bridge referencing technique. The sensor has an excellent insensitivity to source intensity fluctuations as well as mode dependent and mode independent changes in the damping ...
G, Martens, J, Kordts, G, Weidinger
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Pressure Management Helps Reduce Losses

Opflow, 1999
This article discusses pressure management, which is the practice of controlling the amount of water pressure by decreasing it where it is excessive, maintaining it where it is sufficient, and sustaining it where it is weak or unpredictable. Topics covered include: management by sector; pump control; throttled system valves; fixed outlet hydraulic ...
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Evaluation of Pressure Oscillator Losses

AIP Conference Proceedings, 2006
Efficiencies of regenerative cryocoolers are influenced by losses within the pressure oscillator (Stirling‐type compressor). An evaluation of these losses is important when searching for ways to improve the overall cryocooler efficiency. Typically, compressor efficiency is taken as the ratio of PV power of the piston(s) to electrical input power.
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Conductive hearing loss associated with pressure equalization tubes

Otolaryngology–Head and Neck Surgery, 2000
Pressure equalization (PE) tube placement traditionally has been used to lessen conductive hearing loss with chronic middle ear effusion. It is assumed that the small diameter of the tube should not interfere with the conduction of sound. In this article we present 5 patients in whom placement of a PE tube resulted in significantly worse conductive ...
S A, Estrem, P S, Batra
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Perceptive Hearing Loss and Increased Intracranial Pressure

Archives of Otolaryngology - Head and Neck Surgery, 1968
PREVIOUS AUTHORS are in disagreement whether or not an increased pressure of the cerebrospinal fluid affects hearing ability. The present study is based on a correlation between hearing for pure tones and intracranial pressure. Pressure is evaluated by direct measurements of the intraventricular pressure as well as an estimation of papilledema in the ...
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Noise-induced hearing loss and blood pressure

International Archives of Occupational and Environmental Health, 1990
The study was carried out on 85 workers with long-term exposure to noise levels exceeding 85 dB(A). The control group consisted of 85 workers who had never been exposed to noise levels greater than recommended, i.e. 85 dB(A), in their working environment. All the workers in the exposed group had hearing loss which was confirmed by audiometry.
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Blood pressure prompts ten stone weight loss

Nursing Standard, 2011
A nurse is celebrating after shedding nearly ten stone in weight and ditching her blood pressure tablets.
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