Direct Detection Of Water Flow Behind Pipe Using A Transient Oxygen Activation Technique

1992 ◽  
Vol 31 (04) ◽  
Author(s):  
G. Uswak ◽  
E. Howes
Keyword(s):  
Water Flow ◽  
Direct Detection ◽  
Oxygen Activation ◽  
Activation Technique

Direct Detection of Downward Flow of Water Behind Casing Using Oxygen Activation Technique in Inverted Mode

2010 ◽  
Author(s):  
Naveed Akram ◽  
Shahzad Ali ◽  
Bilal Shaukat ◽  
Muhammad Haroon Mughal ◽  
Muzammil Ahmed Khidri ◽  
...  
Keyword(s):  
Direct Detection ◽  
Oxygen Activation ◽  
Activation Technique ◽  
Downward Flow

Improved Oxygen-Activation Method for Determining Water Flow Behind Casing

1991 ◽  
Vol 6 (03) ◽  
pp. 334-342 ◽  
Author(s):  
D.C. McKeon ◽  
H.D. Scott ◽  
J-R. Olesen ◽  
G.L. Patton ◽  
R.J. Mitchell
Keyword(s):  
Water Flow ◽  
Oxygen Activation ◽  
Activation Method

The Disposal of Tailed Peak in the Time Spectrum of Pulsed Neutron Oxygen Activation Logging

2013 ◽  
Vol 318 ◽  
pp. 567-571
Author(s):  
Wu Dong ◽  
Hai Min Guo ◽  
Xin Qi
Keyword(s):  
Flow Velocity ◽  
Water Flow ◽  
Transit Time ◽  
Gaussian Function ◽  
Oxygen Activation ◽  
Time Spectrum ◽  
Flow Time ◽  
Redundant Data ◽  
Time Flow ◽  
Pulsed Neutron

In the time spectrum of impulse oxygen activation logging, grave tailed peak occurs when the viscosity of polymer is high and the velocity of the flow is not even. The calculation of transit time, flow velocity as well as flow volume depends on the duration of the oxygen activation peak, so the disposal of the grave tailed peak in the time spectrum of impulse oxygen activation logging is critical. And an effective way to deal with tailed peak will improve the calculation accuracy of transit time and flow velocity. In this paper, the problem of tailed peak is studied, then an algorithm combining Logarithmic transformation and Gaussian function, which is used to deal with tailed peaks in the time spectrum of water flow of pulsed neutron oxygen activation logging, is proposed. Gaussian function is used to describe tailed peaks in the time spectrum of water flow of pulsed neutron oxygen activation logging in the logarithm space. Case analysis shows that the disposal effect of the algorithm is good, effectively eliminating the redundant data of the tailed peak in the flow time spectrum of pulsed neutron oxygen activation logging. The algorithm is a practicable method to deal with the tailed peak in the flow time spectrum of pulsed neutron oxygen activation logging.

The Analysis and Study on Separation of Overlapping Peaks in the Time Spectrum of Oxygen Activation Logging

2013 ◽  
Vol 318 ◽  
pp. 601-606
Author(s):  
Wu Dong
Keyword(s):  
Water Flow ◽  
Gaussian Function ◽  
Oxygen Activation ◽  
Time Spectrum ◽  
Flow Volume ◽  
Gray System Theory ◽  
Gray System ◽  
Overlapping Peaks ◽  
The Difference ◽  
Two Peaks

In the time spectrum of impulse oxygen activation logging, there will be two peaks which are overlapping when the difference of velocity in oil tubing and casing are very small. Transit time, an important parameter to calculate the velocity of water flow, depends on the foot time of a full peak. So does the computing of velocity and flow volume. Therefore, the separation of the overlapping peak in the time spectrum of impulse oxygen activation logging is the key. A good separation method will increase the precision of flow volume obtained. In this paper, the separation problem of overlapping peak is studied, and an algorithm combining Gaussian function and gray system theory that is used to separate the overlapping peaks in the time spectrum of water flow of pulsed neutron oxygen activation logging is proposed. According to error analysis and rationality test of the case studied, the algorithm shows a high separation precision and its effectiveness in the determination of flow volume, which proves to be a practicable method to separate overlapping peaks in the time spectrum of water flow of oxygen activation logging.

Detection and Characterization of earth-like Planets

1997 ◽  
Vol 161 ◽  
pp. 299-311 ◽  
Author(s):  
Jean Marie Mariotti ◽  
Alain Léger ◽  
Bertrand Mennesson ◽  
Marc Ollivier
Keyword(s):  
Direct Detection ◽  
Contrast Ratio ◽  
Angular Size ◽  
Physical Nature ◽  
Major Axis ◽  
Infrared Emission ◽  
Space Technology ◽  
Semi Major Axis ◽  
Earth Like Planets ◽  
Visible Wavelengths

AbstractIndirect methods of detection of exo-planets (by radial velocity, astrometry, occultations,...) have revealed recently the first cases of exo-planets, and will in the near future expand our knowledge of these systems. They will provide statistical informations on the dynamical parameters: semi-major axis, eccentricities, inclinations,... But the physical nature of these planets will remain mostly unknown. Only for the larger ones (exo-Jupiters), an estimate of the mass will be accessible. To characterize in more details Earth-like exo-planets, direct detection (i.e., direct observation of photons from the planet) is required. This is a much more challenging observational program. The exo-planets are extremely faint with respect to their star: the contrast ratio is about 10−10at visible wavelengths. Also the angular size of the apparent orbit is small, typically 0.1 second of arc. While the first point calls for observations in the infrared (where the contrast goes up to 10−7) and with a coronograph, the latter implies using an interferometer. Several space projects combining these techniques have been recently proposed. They aim at surveying a few hundreds of nearby single solar-like stars in search for Earth-like planets, and at performing a low resolution spectroscopic analysis of their infrared emission in order to reveal the presence in the atmosphere of the planet of CO H2O and O3. The latter is a good tracer of the presence of oxygen which could be, like on our Earth, released by biological activity. Although extremely ambitious, these projects could be realized using space technology either already available or in development for others missions. They could be built and launched during the first decades on the next century.

Effect of verapamil on cytoplasmic distribution of granules and microfilaments in amphibian urinary bladder

1988 ◽  
Vol 46 ◽  
pp. 324-325
Author(s):  
A.J. Mia ◽  
L.X. Oakford ◽  
T. Yorio
Keyword(s):  
Urinary Bladder ◽  
Water Flow ◽  
Morphological Changes ◽  
Granular Cell ◽  
Cytosolic Calcium ◽  
Calcium Storage ◽  
Amphibian Urinary Bladder ◽  
Vesicular Membrane ◽  
High Concentrations ◽  
Cytoskeletal System

The amphibian urinary bladder has been used as a ‘model’ system for studies of the mechanism of action of antidiuretic hormone (ADH) in stimulating transepithelial water flow. The increase in water permeability is accompanied by morphological changes that include the stimulation of apical microvilli, mobilization of microtubules and microfilaments and vesicular membrane fusion events . It has been shown that alterations in the cytosolic calcium concentrations can inhibit ADH transmembrane water flow and induce alterations in the epithelial cell cytomorphology, including the cytoskeletal system . Recently, the subapical granules of the granular cell in the amphibian urinary bladder have been shown to contain high concentrations of calcium, and it was suggested that these cytoplasmic constituents may act as calcium storage sites for intracellular calcium homeostasis. The present study utilizes the calcium antagonist, verapamil, to examine the effect of calcium deprivation on the cytomorphological features of epithelial cells from amphibian urinary bladder, with particular emphasis on subapical granule and microfilament distribution.

A novel enzyme immunoassay for the direct detection of H. pylori antigens in stool

2001 ◽  
Vol 120 (5) ◽  
pp. A492-A493 ◽  
Author(s):  
E HAINDL ◽  
H BENESCH ◽  
A FINCK ◽  
V MUEHISTEIN ◽  
A LEODOLTER ◽  
...  
Keyword(s):  
Enzyme Immunoassay ◽  
Direct Detection ◽  
H Pylori
Sign in / Sign up

Export Citation Format

Share Document