196,284 research outputs found
Effect of fertilizer, furrow length, and irrigation flow rate on soil nutrient and yield of apple orchard
No full textThe objective of this study was to evaluate the impact of furrow irrigation with a length of 96, 144, and 192 m and a flow rate of between 0.2 and 0.4 Ls-1 on the leaching of nitrogen, phosphorus, and humus from dry subtropical soils in Azerbaijan. Moreover, the impact of six fertilizer levels, namely, control (without fertilizer), 10 t ha-1 of cow manure, N90P90K90 + 10 t ha-1 of cow manure, N120P90K90 + 10 t ha-1 of cow manure, N120P120K90 + 10 t ha-1 of cow manure, and N120P90K120 + 10 t ha-1 of cow manure, on the performance of apple orchards, has been examined. The findings indicate that the brown soils of the irrigated grassland exhibit normal humus, total nitrogen, and weak phosphorus levels, with a gradual decline observed in the lower layers. Applicable to the agricultural and subsurface layers, the aggregates are 0.25-1.0 mm in diameter, with an agricultural value of 12.9% and 21.8%, respectively. This indicates a poor structural condition of the apple orchard soil. The elevation of the water flow rate from 0.2 to 0.4 Ls-1 resulted in a greater extraction of humus, nitrogen, and phosphorus from the soil. Both water flow rates increased the nutrients and humus leaching from the soil. By extending the furrow length to 192 m, the losses of humus (3.25%), nitrogen (0.36%), and phosphorus (0.30%) from the soil in both water flows significantly increased in comparison to the 96-m length. By extending the length of furrows to 192 m, the yield (21.97 t ha-1) was significantly reduced in comparison to the 96-m length (22.31 t ha-1). As a consequence of the application of N120P90K120 + 10 t ha-1 of cow manure, the yield of 27.3 t ha-1 was significantly elevated in comparison to other fertilizer treatments and the control treatment (17.9 t ha-1). Therefore, management of fertilizer systems, furrow length, and water flow can improve soil fertility and plant yield by reducing erosion in the meadow-brown soil of Azerbaijan
UPLC-ESI-MS/MS screening, potential of larvicide and antioxidant activity of bioactive compounds in gagea bohemica extracts
No full textThis work was designed to phenolic compound analysis with UPLC-ESI-MS/MS (Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry), antioxidant and larvicidal (against Musca domestica and Culex pipiens) activities of acetone, methanol and water extracts of different parts (fresh and underground) of G. bohémica extract. The antioxidant activities were determined using six complementary methods (DPPH, ABTS, Phosphomolybdenum, FRAP, CUPRAC assays and ß-Carotene-linoleic acid method). Among extracts, the lowest IC50 value in the DPPH test was obtained from the acetone extract of the underground part (0.652 ± 0.023 jj,g/mL, IC5 0).The determination of contents were evaluated using total phenolics, flavonoid and tannin contents and found maximum values in acetone extract of underground part 6.365 ± 0.064 (mgGAE/g extract), 27.634 ± 0.610 (mg CE/g extract), 22.968 ± 0.073 (mg CE/g extract) respectively. Phenolic compounds of water extracts were determined 32 phenolic compounds using UPLC-ESI-MS/MS, and caffeic acid for both parts was found as the major compound with a high amount. The fresh part is more toxic than the underground part with 60.212 ± 2.778 (1 mg/mL dose, %) against M. domestica, and with 0.190 (mg/mL, LC5 0) against Cx. pipiens. These results about G. bohemica was shown as a source of natural potential antioxidant, and have potential use of pharmaceutical, agricultural industry. © by PSP
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
ANTIOXIDANT BIOCHEMICAL AND LARVICIDAL ACTIVITY OF Cyclamen hederifolium EXTRACTS
No full textThis study aimed to determine the total phenolic and flavonoid contents of Cyclamen hederifolium ethanolic, methanolic and acetone extracts, and antioxidant activities of them, to investigate the potential safety/toxicity risks of the different parts and doses of the C. hederifolium ethanolic extracts using enzymes (ALT. ALP, and CRE), and the larvicidal effect of water extract against houseflies (Musca domestica) and mosquitoes (Culex pipiens). In vitro antioxidant activity of the extracts determined using DPPH and. ABTS assays. Total phenolic and flavonoid contents of the extract represented as mg GAE/g-extract and mg QE/g-extract, respectively. For enzyme assay, the blood of five different groups of rats were analysed on days 0, 15, and 30. The highest value with the lowest IC50 value in the DPPH test was obtained from the ethanolic extract of the above ground (AG) (0.83 0.00 ug/mL. The highest value with the lowest IC50 value in the ABTS test was obtained from the methanolic extract of the underground (UG) (0.16 0.00.tg/mL), Statistically significant increases in AG 1% group and significant decreases in UG 1% group were observed in ALT and ALP values (p < 0.05), The AG extract was found to be more toxic against M. domestica (30,45 + 2.78%) and Cr. pipiens (83.33 + 0.00%). Considering the ALT and ALP measurements, the increase in the values in AG 1% group over time indicates liver damage. It seems that UG 1% extract reduces liver enzyme levels, and it has increased larvicidal effect over time
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
Intern experience at CH���M Hill, Inc.: an internship report
No full textIncludes author's vita"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical referencesA review of the author's internship experience with CH���M HILL, Inc.
during the period September 1975 through May 1976 is presented. During this nine month
internship the author worked as an Engineer II in the Industrial Processes discipline of this
large consulting engineering firm... The author's prime responsibility was as one of three
lead design engineers on the design of a large wastewater treatment facility for a pulp mill
in Hoquiam, Washington owned by ITT Rayonier Inc. The work generally consisted of the design
of individual treatment units and associated piping and pumping. The purpose of the project
was to provide wastewater treatment capabilities that would satisfy the effluent limitations
(standards) imposed upon the mill by the State of Washington Department of Ecology and the
U.S. Environmental Protection Agency. The author's assignment also entailed necessary
interaction with the project manager and other CH���M HILL design engineers and support staff
members, the client's representatives, and representatives of two other consulting engineering
firms working on the project. Thus, the internship position at CH���M HILL provided considerable
experience coordinating the author's work with the work of other engineers, guiding the design
and administrative efforts of a support staff, and interacting regularly with the client and
other consulting firms. This broad exposure to a variety of engineering and organizational
problems provided a valuable educational experience
Transition to turbulence in a qblique shock-wave/boundary-layer interaction at M=15
No full textDirect numerical simulations are carried out for different forcing techniques to trigger transition during the interaction between an oblique shock-wave and a laminar boundary-layer at M = 1.5. Three forcing methods are used: a) forcing of oblique unstable modes, whose shape and behaviour are determined by the local linear stability theory, b) broadband free-stream acoustic disturbances, and c) a cold plasma flow control device. While the oblique-mode breakdown is dominant for low-amplitude forcing, long streaky structures drive the transition process in a high-amplitude disturbance environment. LES are also performed on the experimental setup by the Institute of Theoretical and Applied Mechanics (ITAM) from Novosibirsk State University with cold plasma actuation. As well as the disturbance type, the effect of Reynolds number and forcing amplitude will be investigated
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