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Browsing ThinkTech by Department "Agricultural Engineering"
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Item A model for calculating quantity of water pumped from a groundwater reservoir using electric energy consumption data(Texas Tech University, 1972-05) Sechrist, Albert WayneNot Available.Item Analysis and design of mechanical shredders for the control of noxious brush(Texas Tech University, 1971-12) Smith, Clayton CarlNot availableItem Analysis of energy requirements for shredding mesquite(Texas Tech University, 1973-12) Echols, Richard LNot Available.Item Artificial recharge of a hydrologically isolated aquifer in the southern High Plains of Texas(Texas Tech University, 1970-08) Dennis, Steve AustinNot availableItem Development and testing of an autoshift transmission(Texas Tech University, 1976-05) Gill, Dan FrazierNot Available.Item Development of a dual source hydrostatic elevator drive for a twin-powered elevating scraper(Texas Tech University, 1973-08) Moore, Sammy R.Not availableItem Development of an onion-set planter based on design criteria of plant transplanters(Texas Tech University, 1982-12) Sadhu, Ram ReddyNot availableItem Effect of grain type and straw type on separation in combines(Texas Tech University, 1987-12) Shandilya, AkhilNot availableItem Item Estimating albedo for evapotranspiration models(Texas Tech University, 1989-05) Hannabas, Byron BSolar reflectance, or albedo, is one of the most critical factors affecting the prediction of evaporation and evapotranspiration. When evaporation or evapotranspiration is estimated from predictive models, and a poor selection of a value for albedo is made from that available in the published literature, significant errors become inherent in these estimations. A predictive, physically based model has been developed to substantially reduce and possibly eliminate the errors encountered in selecting values for albedo. A literature review concerning albedo is included in the text as well as justifications for the newly developed model.Item An evaluation of different preplant tillage methods upon yields of irrigated grain sorghum on the Texas High Plains(1972-12) Hollingsworth, Dale; Ulich, William L.; Dregne, Harold E.; Foerster, Eugene P.; Lyle, William M.Not AvailableItem Evaluation of water application efficiencies for handmove sprinkler systems(1989-12) Larguech, Ali; Borrelli, John; Fedler, Clifford B.; Zartman, Richard E.Item Evapotranspiration crop coefficients for wetland vegetation(1993-12) Phelps, Matthew B.; Fedler, Clifford B.; Zartman, Richard E.Item Hydraulic characteristics of chemical movement in groundwater(1988-05) Deng, YueyingItem Investigation of a system for groundwater recharge into the Ogallala Formation(Texas Tech University, 1971-08) Peterson, Sam H.Not availableItem Noise levels and operating characteristics of gin stand doffing brushes(Texas Tech University, 1976-08) Laird, Joseph Weldon; Grub, WalterNot availableItem Probability of working days for various agricultural operations(Texas Tech University, 1990-12) Solorzano-Campos, Edwin GA mathematical model was developed to predict the number of days with rain for the continental United States. The model was developed on a cumulative basis using super-positioning techniques and published weather data from 89 weather stations. Prediction of rain-days using the model requires only a limited number of readily available data inputs, which are day of year, mean annual precipitation, mean annual temperature, and climatic region. Mathematical relationships found for the model coefficients were explained by the distribution patterns of precipitation. Ten different areas were defined based on the coefficients determined for the model. The model was applied to generate probability prediction data for incorporation of chemicals by rain, probability of having no rain for hay, and probability of non-wet days for machinery operations and dry soil surface days use in the prediction of wind erosion.Item Sprinkler system performance and irrigation scheduling effects on turfgrass quality(1991-12) Dean, Sonny RayTests were run to evaluate the effects of sprinkler and lateral spacings on the uniformity coefficient and the water application efficiency at three different pressures on six different types of sprinkler heads. Tests were run under wind speeds less than five miles per hour. For this study data were obtained from literature. A computer program was developed to calculate the uniformity coefficient, water application efficiency, water application rate, and the time it would take to apply one inch of water when overlapped 0% x 0%, 25% x 25%, 50% x 50%, 67% x 67%, and 75% x 75%. Each data set was evaluated and was averaged to obtain results for six sprinkler types. Tests to determine the aesthetic quality of turfgrass at different levels of irrigation were run on small turf plots. The grass used in the plot was Cynodon dactylon (L.) Pers. (Common Bermudagrass). Data for cool season grasses were obtained from literature. The data were analyzed and a relationship between turfgrass quality and water application depth/evapotranspiration was developed for each turfgrass type. The results of the investigation show that the uniformity coefficient and water application efficiency generally decreases with pressure and increases as sprinkler and lateral spacing is decreased. There was little difference between triangular and rectangular spacings. Turfgrass quality decreases as sprinkler and lateral spacing increases. Turfgrass quality ratings were found to only decrease slightly when irrigating at 75% of evapotranspiration. Irrigation scheduling is essential for achieving and maintaining high quality rating. The depth needed to meet turfgrass evapotranspiration in all areas allows for over-irrigation and increased with sprinkler and lateral spacings, thus increasing operational cost. A computer program was developed using these results to give turfgrass designers and operators a tool to evaluate sprinkler system design on a basis of uniformity coefficient, water application efficiency, sprinkler system construction cost, water cost, and the turfgrass quality rating.Item The aerobic decomposition of solid beef cattle feedlot waste(Texas Tech University, 1970-12) Martin, James DonaldNot availableItem The Effect of Irrigation tailwater Runoff Time on Crop Yield Along Graded Furrows(Texas Tech University, 1974-05) New, Leslie LeonNot Available.