Hydraulics—Head; Pressure; Velocity

2019 ◽  
pp. 63-68
Author(s):  
Norman Lieberman
Keyword(s):  
Head Pressure

scholarly journals On Similarity of Seismo Magnetic Power Density and Pressure Head Fractal Dimension for Characterizing Shajara Reservoirs of the Permo-Carboniferous Shajara Formation, Saudi Arabia

2020 ◽  
pp. 1-8
Author(s):  
Khalid Elyas Mohamed Elameen Alkhidir ◽  
Keyword(s):  
Fractal Dimension ◽  
Power Density ◽  
Functional Relationship ◽  
Fractal Dimensions ◽  
Pressure Head ◽  
Density Maximum ◽  
Phase Saturation ◽  
Head Pressure ◽  
Second Procedure ◽  
The Relationship

The quality and assessment of a reservoir can be documented in details by the application of seismo magnetic power density. This research aims to calculate fractal dimension from the relationship among seismo magnetic power density, maximum seismo magnetic power density and wetting phase saturation and to approve it by the fractal dimension derived from the relationship among inverse pressure head * pressure head and wetting phase saturation. Two equations for calculating the fractal dimensions have been employed. The first one describes the functional relationship between wetting phase saturation, seismo magnetic power density, maximum seismo magnetic power density and fractal dimension. The second equation implies to the wetting phase saturation as a function of pressure head and the fractal dimension. Two procedures for obtaining the fractal dimension have been utilized. The first procedure was done by plotting the logarithm of the ratio between seismo magnetic power density and maximum seismo magnetic power density versus logarithm wetting phase saturation. The slope of the first procedure = 3- Df (fractal dimension). The second procedure for obtaining the fractal dimension was determined by plotting the logarithm (inverse of pressure head and pressure head) versus the logarithm of wetting phase saturation. The slope of the second procedure = Df -3. On the basis of the obtained results of the fabricated stratigraphic column and the attained values of the fractal dimension, the sandstones of the Shajara reservoirs of the Shajara Formation were divided here into three units

scholarly journals ANÁLISE DA DISTRIBUIÇÃO DA CARGA HIDRÁULICA E VAZÃO NA UNIDADE OPERACIONAL DE UM SISTEMA DE IRRIGAÇÃO LOCALIZADA

Irriga ◽  
2007 ◽  
Vol 12 (4) ◽  
pp. 481-491
Author(s):  
Francisco F. N. Marcussi ◽  
João Carlos Cury Saad ◽  
Saulo A. de Souza ◽  
Carlos E. A. G. Barreto
Keyword(s):  
Operational Research ◽  
Irrigation System ◽  
Hydraulic Head ◽  
System Management ◽  
Lateral Lines ◽  
System 2 ◽  
Head Pressure ◽  
Lower Discharge ◽  
Discharge Distribution ◽  
Operational Unit

ANÁLISE DA DISTRIBUIÇÃO DA CARGA HIDRÁULICA E VAZÃO NA UNIDADE OPERACIONAL DE UM SISTEMA DE IRRIGAÇÃO LOCALIZADA  Francisco F. N. Marcussi1; João C. C. Saad2; Saulo A. de Souza1; Carlos E. A. G. Barreto11Escola de Engenharia de São Carlos, Universidade de São Paulo, São Carlos, SP, [email protected] de Engenharia Rural, Faculdade de Ciências Agronômicas, Universidade Estadual Paulista, Botucatu, SP  1 RESUMO As diferentes possibilidades de combinações de uniformidade de emissão na unidade operacional, de um sistema de irrigação localizada, com a declividade do terreno, favorecem a ocorrência de várias configurações no sistema de irrigação, por consecutivo de diferentes distribuições de carga hidráulica, vazão e de manejo do sistema. Atenta-se para o problema do dimensionamento do sistema, nesse sentido, da verificação da distribuição de pressão e vazão, na unidade operacional, após o mesmo ser implantado. Este trabalho teve por objetivo verificar a uniformidade de pressão e vazão na linha de derivação e nas linhas laterais com microaspersores, em dados obtidos por pesquisa operacional. Os resultados permitem averiguar que independente da declividade analisada, quanto maior é a uniformidade de emissão calculada para a linha de derivação no projeto, maior é sua uniformidade de pressão. Já os resultados de vazão nos emissores da unidade operacional, embora diferentes frente às três lâminas de irrigação testadas, mostram uma variação constante entre o ponto de maior vazão e o de menor vazão. UNITERMOS: irrigação, pressão e uniformidade de emissão.  MARCUSSI, F.F.N.; SAAD, J.C.C.; SOUZA, S.A.; BARRETO, C.E.A.G. ANALYSIS OF LOAD HYDRAULIC UNIFORMITY AND DISCHARGE IN THE OPERATIONAL UNIT OF AN IRRIGATION SYSTEM  2 ABSTRACT The different combination possibilities of emission uniformity and field slope within the operational unities of localized irrigation systems favor the occurrence of some configurations in the irrigation system, and consequently different hydraulic head distributions, discharge and system management. After the system has been implanted, it is necessary to verify pressure and discharge distribution in the operational unit. This work objective was to verify pressure and discharge uniformity on derivation line and lateral lines with micro sprinkle in data gotten from operational research. The results allow to check that despite analyzed declivity; the higher the emission uniformity calculated for the line of derivation in the project is, the higher its pressure uniformity is. Previously the results of discharge in the emitters of the operational unit showed a constant variation entering the point of higher discharge and lower discharge , even though differently from the three tested irrigation blades.KEYWORDS: Irrigation, hydraulic head, pressure uniformity.

Production test results for determining the well head pressure

2020 ◽  
Author(s):  
Kristiati Eko Andreastuti ◽  
Bambang Bintarto ◽  
Basith Furqon
Keyword(s):  
Production Test ◽  
Test Results ◽  
Head Pressure

scholarly journals A Reversible Cytotoxic Lesion of the Corpus Callosum Developing after a Rapid Alteration in Cerebrospinal Fluid Pressure/Volume in a Patient with New Daily Persistent Headache

2020 ◽  
Vol 2020 ◽  
pp. 1-4
Author(s):  
Todd D. Rozen ◽  
Hector A. Robles
Keyword(s):  
Central Nervous System ◽  
Corpus Callosum ◽  
Fluid Pressure ◽  
New Daily Persistent Headache ◽  
Csf Pressure ◽  
Acute Withdrawal ◽  
History Of ◽  
The Central Nervous System ◽  
Head Pressure ◽  
Persistent Headache

A case is presented of a woman with a history of daily persistent head pressure and dizziness who developed a cytotoxic lesion of the splenium of the corpus callosum after an acute withdrawal of chronic acetazolamide treatment and then, in quick succession, a CSF pressure/volume drop with a lumbar puncture. This is the first documentation that rapid alterations of CSF pressure/volume may trigger cytotoxic lesions in the central nervous system.

A field versus laboratory study of blood oxygen status in normoxic crabs at different temperatures

1996 ◽  
Vol 74 (3) ◽  
pp. 423-430 ◽  
Author(s):  
J.-C. Massabuau ◽  
J. Forgue
Keyword(s):  
Wide Spectrum ◽  
Venous Blood ◽  
Carcinus Maenas ◽  
Blood Oxygen ◽  
Arterial Blood ◽  
Field Versus ◽  
Partial Pressures ◽  
Different Temperatures ◽  
Head Pressure ◽  
Oxygen Status

The blood oxygen status of two species of active crabs (Carcinus maenas and Necora puber) was studied in the field and compared with the results of previous laboratory experiments performed on a wide spectrum of physiologically different water-breathers. The aim was to determine whether, as in the laboratory, the functioning of the O2 supply system in the field could be based on maintaining the arterial [Formula: see text] in the low range, 1–3 kPa. The O2 partial pressures and concentrations in the arterial and venous blood, arterial blood pH, and blood respiratory pigment concentration were measured in normoxic water at various temperatures ranging from 10 to 20 °C and in various seasons. In the field, [Formula: see text] values in normoxic C. maenas and N. puber were in the low range, 1–3 kPa, independently of temperature, season, and blood haemocyanin concentration. It is concluded that in the field as in the laboratory, [Formula: see text] values mainly in the low range provide a head pressure sufficient to meet O2 needs. The changes that appear to occur in other respiratory variables are discussed in relation to field versus laboratory conditions and temperature differences. The consequences for analysing problems of hypoxaemia in hypoxic waters or situations are discussed.

Reinforcement Analysis of a Slab Tank

2005 ◽  
Author(s):  
Yogeshwar Hari
Keyword(s):  
Finite Element ◽  
Internal Pressure ◽  
Side Member ◽  
Short Side ◽  
Channel Section ◽  
Finite Element Software ◽  
Head Pressure ◽  
Tank Design ◽  
Critical Requirement ◽  
Static Head

The objective of this paper is to reduce the stresses and deflection of an existing slab tank [2]. The slab tank is to store various criticality liquids used in today’s industry. The preliminary overall dimensions of the slab tank are determined from the capacity of the stored liquids. The slab tank design is broken up into (a) two long side members, (b) two short side members, (c) top head, and (d) bottom head. The slab tank is supported from the bottom at a height by a rectangular plate enclosure. The deflection of the linear space is a critical requirement. The deflection is controlled by providing external supports from the bottom at a height by adjustable bolts. The analysis of the slab tank showed excessive stresses at the concentrated supports. The slab tank was modified by providing reinforcement on the long side members. Several reinforcement arrangements were considered. The slab tank is subjected to two conditions. First, vacuum condition, the long side plates will deflect inwards. Second, internal pressure condition the design pressure consists of working internal pressure plus static head pressure. For this the long side plates will deflect outwards. The heads are designed for internal pressure at the bottom where the pressure is the maximum. The vacuum pressure is not critical. The dimensioned slab tank is modeled using STAAD III finite element software. The slab tank showed excessive stresses. The concentrated supports were removed. The long side member was reinforced by a Channel section. The slab tank analysis was simplified by modeling a single long side member and three cases of Channel section reinforcement were considered. The reinforced arrangement was analyzed by STAAD III finite element software. Further analysis by changing the Channel section by plate reinforcement was found to be better.

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