نتایج جستجو برای: pumping

تعداد نتایج: 13661  

2010
John C. Risley Jim Constantz Hedeff Essaid

[1] The relative impact of a large upstream dam versus in‐reach groundwater pumping on stream temperatures was analyzed for humid, semiarid, and arid conditions with long dry seasons to represent typical climate regions where large dams are present, such as the western United States or eastern Australia. Stream temperatures were simulated using the CE‐QUAL‐W2water quality model over a 110 kmmod...

2002
M. Ossendrijver

We study the pumping of magnetic flux in three-dimensional compressible magnetoconvection in the context of stellar dynamos. The simulation domain represents a rectangular section from the lower part of a stellar convection zone plus the underlying stably stratified layer, with a total depth of up to five pressure scale heights. Once convection has attained a statistically stationary state, a m...

2014
Laura M Bexfield Bryant C Jurgens

Seasonal variability in groundwater pumping is common in many places, but resulting effects of seasonal pumping stress on the quality of water produced by public-supply wells are not thoroughly understood. Analysis of historical water-quality samples from public-supply wells completed in deep basin-fill aquifers in Modesto, California (134 wells) and Albuquerque, New Mexico (95 wells) indicates...

2009
M. A. Younes

El Batts Pumping station is located in Fayoum Governorate on the right bank of existing Batts drain about 120 km south of Cairo, at entrance of 0.6 km north-west of Tamiya village. It is equipped with four vertical mixed flow pumping units. The main objectives of this pumping station are to increase the cultivated area by 10000 feddan in the north of Bahr Wahby, improve the irrigation for 20000...

2015
Jung Hwal Shin Geon Hwee Kim Intae Kim Hyungkook Jeon Taechang An Geunbae Lim

Liquid pumping can occur along the outer surface of an electrode under a DC electric field. For biological applications, a better understanding of the ionic solution pumping mechanism is required. Here, we fabricated CNT wire electrodes (CWEs) and tungsten wire electrodes (TWEs) of various diameters to assess an ionic solution pumping. A DC electric field created by a bias of several volts pump...

2014
Caroline C Philpott

The primary role of the ZIP13 metal transporter in flies is to move iron ions out of cells, rather than moving zinc ions into cells, as is the case in human cells.

Journal: :Journal of contaminant hydrology 2014
Lindsay A McMillan Michael O Rivett John H Tellam Peter Dumble Helen Sharp

Pumped groundwater sampling evaluations often assume that horizontal head gradients predominate and the sample comprises an average of water quality variation over the well screen interval weighted towards contributing zones of higher hydraulic conductivity (a permeability-weighted sample). However, the pumping rate used during sampling may not always be sufficient to overcome vertical flows in...

Journal: :Lab on a chip 2013
Tzer Hwai Gilbert Thio Fatimah Ibrahim Wisam Al-Faqheri Jacob Moebius Noor Sakinah Khalid Norhayati Soin Maria Kahar Bador Abdul Kahar Marc Madou

A technique known as thermo-pneumatic (TP) pumping is used to pump fluids on a microfluidic compact disc (CD) back towards the CD center against the centrifugal force that pushes liquids from the center to the perimeter of the disc. Trapped air expands in a TP air chamber during heating, and this creates positive pressure on liquids located in chambers connected to that chamber. While the TP ai...

2017
Megumi Takahashi Shin Takagi

Feeding, a vital behavior in animals, is modulated depending on internal and external factors. In the nematode Caenorhabditis elegans, the feeding organ called the pharynx ingests food by pumping driven by the pharyngeal muscles. Here we report that optical silencing of the body wall muscles, which drive the locomotory movement of worms, affects pumping. In worms expressing the Arch proton pump...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده برق و کامپیوتر 1393

انرژی یک کمیت اساسی در طبیعت بوده و بر اساس آن اولین قانون ترمودینامیک بنا گردیده است. عملگرها لزوماً انرژی را به سیستم تزریق می¬کنند و یا انرژی سیستم را از بین می¬برند. حس¬گرها به ¬منظور اندازه¬گیری برخی متغیرهای مورد¬ علاقه، انرژی سیستم را می¬گیرند. تمام الگوریتم¬های کنترلی که از فیدبک استفاده می¬کنند، حداقل یک متغیر فیزیکی سیستم را که باید کنترل شود، اندازه می¬گیرند؛ بنابراین تمام الگوریتم¬ها...

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