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Influence of Cracking on Rice Seasons and Irrigation in Bangladesh
Influence of Cracking on Rice Seasons and Irrigation in Bangladesh
Influence of Cracking on Rice Seasons and Irrigation in Bangladesh
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Winter dry season is mainly depends on irrigation. Because, the rainfall in this season is almost zero. At the end of this season, ground water mainly remains at about 10-12 meter depth. On the other hand, the crop then remains at booting to flowering stages. During this period, a huge number of cracks developed on the puddled field due to shortage of water. Consequently, the size and number of cracks depend on the irrigation interval, the intensity and duration of drought spell. The sizes of the cracks are range about 10-30 mm wide. Normally, the major cracks goes below puddled layer of 70-100 mm and almost all the cracks are interlinked and remain active through the growing season. Therefore, a major portion of the irrigation water lost through this cracks. Hence, a large area remains fallow due to proper management and shortage of irrigation water. Therefore, irrigation application efficiency to be increased in cracking soils by reducing seepage and drainage losses in paddies. As a result, it is important to develop irrigation scheduling of rice for cracking soils on the basis of crack size rather than estimating crop water requirements based on evapotranspiration (ET) demand.
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Other Articles:
| • | Analysis of novel geometry-independent method for dialysis access pressure-flow monitoring |
| Background: End-stage renal disease (ESRD) confers a large health-care burden for the United States, and the morbidity associated with vascular access failure has stimulated research into detection of vascular access stenosis and low flow prior to thrombosis. We present data investigating the possibility of using differential pressure (?P) monitoring to estimate access flow (Q) for dialysis access monitoring, with the goal of utilizing micro-electro-mechanical systems (MEMS) pressure sensors integrated within the shaft of dialysis needles. Methods: A model of the arteriovenous graft fluid circuit was used to study the relationship between Q and the ?P between two dialysis needles placed 2.5?20.0 cm apart. Tubing was varied to simulate grafts with inner diameters of 4.76?7.95 mm. Data were compared with values from two steady-flow models. These results, and those from computational fluid dynamics (CFD) modeling of ?P as a function of needle position, were used to devise and test a method of estimating Q using ?P and variable dialysis pump speeds (variable flow) that diminishes dependence on geometric factors and fluid characteristics. Results: In the fluid circuit model, ?P increased with increasing volume flow rate and with increasing needle-separation distance. A nonlinear model closely predicts this ?P-Q relationship (R2 > 0.98) for all graft diameters and needle-separation distances tested. CFD modeling suggested turbulent needle effects are greatest within 1 cm of the needle tip. Utilizing linear, quadratic and combined variable flow algorithms, dialysis access flow was estimated using geometry-independent models and an experimental dialysis system with the pressure sensors separated from the dialysis needle tip by distances ranging from 1 to 5 cm. Real-time ?P waveform data were also observed during the mock dialysis treatment, which may be useful in detecting low or reversed flow within the access. Conclusion: With further experimentation and needle design, this geometry-independent approach may prove to be a useful access flow monitoring method. | |
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| • | University of Washington: Assistant Professor |
| Assistant Professor, University of Washington, Seattle, WA 98195-7940. Posted on 25 July 2007. | |
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| • | Professor Bernstein delivers his final IEEE Distinguished Visitor Lecture, Orlando, Fla., Dec. 8 |
| (Stevens Institute of Technology) Stevens Institute of Technology Professor Lawrence Bernstein will deliver his 18th and final IEEE Distinguished Visitor Lecture to the Orlando Section Chapter of the IEEE Computer Society, on the topic "Trustworthy Software for Today and Tomorrow," Dec. 8, 2008, at the University of Central Florida. | |
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| • | [LETTERS] Technetium Tc99m Tetrofosmin Single-Photon Emission CT for the Assessment of Glioma Proliferation |
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| 2007, binocular, binoculars, catalog, different, durability, fully, inspect , item, ll, receive, reject sure, request, service, suppliers, telescopes, unsatisfactory reject, year | |
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| • | stereoscopic microscope - Hutchinson encyclopedia article about ... |
| Instrument for forming magnified images with high resolution for detail. Optical and electron microscopes are the ones chiefly in use; other types include acoustic, scanning ... | |
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Journal of Biological Sciences
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By editor@_DOMAIN - Copyright © 2008 Microsoft. All rights reserved. These XML results may not be used, reproduced or transmitted in any manner or for any purpose other than rendering Live Search results within an RSS aggregator for your personal, non-commercial use. Any other use of these results requires express written permission from Microsoft Corporation. By accessing this web page or using these results in any manner whatsoever, you agree to be bound by the foregoing restrictions. - version: v1.5 build A