Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 134 for “"Drip"”.
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Membrane deflection in inline drip emitters
… the behavior of membranes found within inline drip emitters when subjected to a concentrated load. Knowing the response of the membrane can be useful in optimizing future emitter designs for characteristics such as lower activation pressure. Two different types of membranes were studied, one …
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Direct mass measurements beyond the proton drip-line
… 148Tm) were determined to lie beyond the proton drip-line. The data were included into the Atomic Mass Evaluation (AME) and showed generally good agreement with previous measurements. The implication of the results on the nuclear structure and on the location of the proton drip-line is discussed …
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Evaluation of pre-packaged agricultural drip irrigation kits
… of two different agricultural pre-packaged drip irrigation kit (PDIK) systems: Chapin Bucket Kit and International Design Enterprises (IDE) drip kit. PDIK systems are a cost-effective type of appropriate technology for the developing world because they reduce agricultural water consumption …
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Modeling and designing the future of drip irrigation : a validated parametric analysis used to design low power, pressure compensating drip emitters
Drip irrigation is a means of distributing the exact amount of water a plant needs by dripping water directly onto the root zone. It can produce up to 90% more crops than rain-fed irrigation, and reduce water consumption by 70% compared to conventional flood irrigation. In the coming years, the …
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A cost optimization of solar-powered, drip irrigation systems
… design and cost optimization for solar-powered, drip irrigation systems. Historical irradiance data and crop consumption data are considered and modelled during these design steps. A cost optimization is utilized in order to determine low-cost, optimum configuration that meets the required water …
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Solid particles flow through labyrinth channels in drip emitters
Clogging of drip irrigation emitters can reduce the effectiveness of drip irrigation systems. The most common way of studying clogging in a laboratory setting is to recreate the actual timing conditions of on-site drip irrigation systems. However, this requires a clogging period on the order of …
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A hybrid computational and analytical model of irrigation drip emitters
… performance of inline pressure-compensating (PC) drip emitters. A verified CFD model is used to predict flow behavior through tortuous paths. A method of extracting a pressure scaling parameter from the CFD results for use in an analytical model is presented. Analytical expressions that describe …
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Self-installation of drip irrigation emitters for prototype emitter testing
… I tested methods of adhering factory-made drip emitters to the interior of short segments of piping. Different types of adhesive and pipe material combinations were tested, and I selected three combinations for further testing. Performance similar to factory-installed drip emitters was …
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Design Theory for Channel-less, Low-Pressure, Pressure-Compensating Drip Emitters
Drip irrigation is a tool used to aid farmers in water scarce locations by offering a higher water efficiency than conventional methods. However, drip systems require larger energy input thus increasing capital and operating expenses posing a barrier to its adoption, specifically in lower-middle …
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Design and experimental study on pressure compensating emitters in drip irrigation
… the basic physics behind the collapsible tube dripper design used in drip irrigation. A study was performed on the dynamics of the flow limitation of collapsible tubes. Two parameters were studied: outlet hole diameter and effective length. Prototypes were made varying these parameters, and …
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Design Theories for Compact, Low-energy, Clog-resistant Drip Irrigation Emitters
… for compact, low-pressure, clog-resistant drip emitters that can make drip irrigation affordable, reliable, and easier for farmers to adopt. Broad adoption of water-efficient irrigation methods such as drip irrigation is imperative to sustainably meet projected global food demand against …
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SUBSURFACE DRIP IRRIGATION AND UREA PHOSPHATE USE IN VEGETABLES ON CALCAREOUS SOILS.
Drip irrigation lines placed 15 cm deep or 5 cm shallow below soil surface and furrow irrigation were compared on calcareous soils of southern Arizona. Crops grown were zucchini squash (Cucurbita pepo L.) 1982 and 1983 summers, and cabbage (Brassica oleracea var. capitata L.), 1982 fall. Furrows …
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Paleo-aridity records investigated through drip water chemistry in Lehman Caves, Nevada
… for the Great Basin. In Lehman Cave, Nevada, ten drips above actively-forming stalagmites were sampled monthly. Glass growth plates were also placed above three actively-forming stalagmites, allowing for the collection of new calcite growths. This project analyzed the samples for Mg/Ca, Sr/Ca, and …
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Development of Methods to Aid in Flotation Circuit Evaluations and Drip Pan Design
… water distribution system should be changed to a drip pan and that the design of the slurry-air distributor from the mixing chamber should be altered. The experimental data showed that as froth depth, rotor speed, and wash water rate changed, the performance of the cell followed expected trends …
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An Assessment of the Greatest Impacts on Distribution Uniformity for Drip and Micro Irrigation
… Irrigation Training and Research Centers (ITRC) drip/micro evaluation program, global, or system, DU<sub>lq</sub> is computed by combining the component DU<sub>lq</sub> values of: pressure variation, uneven spacing between emitters, unequal drainage and “other” causes. “Other” causes include …
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Parametric design and performance validation of low-cost, low-pressure drip emitters and irrigation systems
… methods to reduce the cost and energy use of drip irrigation systems, with the aim of increasing their adoption among smallholder farmers. By 2050, the growing world population will require a 55% increase in food production above 2010 levels. Yet, agriculture already places a large strain on …
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Product architectures for solar-powered drip irrigation (SPDI) systems in the Middle East and North Africa
… region in the world. Solar-powered drip irrigation (SPDI) has the potential to increase water use efficiency and reduce fossil fuel use for irrigation. Despite these benefits, SPDI adoption is limited by its high investment cost and the misalignment between farmers' risk tolerance …
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ESTABLISHMENT OF TURFGRASS FROM SEED AND SOD IN SAND BASED SYSTEMS COMBINING SPRINKLER AND SUBSURFACE DRIP IRRIGATION SYSTEMS
… establishment of turfgrass using subsurface drip irrigation (SDI) in sand based media has limited success. However, it is unknown if starting with overhead (sprinkler) irrigation and transitioning to SDI can enhance turfgrass establishment. Two experiments were conducted at Stephen F. Austin …
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Optimizing Corn and Cotton Performance with Adaptive Management Systems and Subsurface Drip Irrigation in the Mid-Atlantic USA
… approach. 2. To analyze subsurface drip irrigation (SDI) effects on corn grain yield under different seeding and nitrogen (N) application rates in drought-prone soils of Eastern Virginia. 3. To evaluate SDI strategies in cotton, assessing the effects of dripline spacing, plant growth …
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