177,170 research outputs found
EVAPOTRASPIRAZIONE E RISPOSTA PRODUTTIVA DELLA MELANZANA SOTTOPOSTA A DIFFERENTI REGIMI IRRIGUI NELL’ITALIA MERIDIONALE.
No full textInterventi sul contenuto idrico del suolo: drenaggio e irrigazione
No full textIl presente capitolo tratta le tematiche connesse alla gestione sostenibile della risorsa idrica nei sistemi agricoli.
Nella prima parte vengono fornite informazioni relative al bilancio idrico del suolo e agli interventi tecnici idonei a mantenere il giusto equilibrio tra le voci del bilancio per un uso efficiente sia della risorsa idrica che del suolo stesso.
Nel trattare la voce del bilancio relativa al drenaggio, vengono illustrate le tecniche agronomiche utilizzate per assicurare lo smaltimento dell’acqua in eccesso attraverso gli impianti di drenaggio a fognatura, a dreni temporanei e tubolari, e i relativi benefici in termini agronomici e ambientali.
Successivamente vengono descritti i principi di base della tecnica irrigua, finalizzata all’apporto artificiale di acqua alle colture in caso di carenza nel suolo. Vengono illustrate le principali variabili irrigue, la determinazione del momento dell’intervento e dei volumi di adacquamento e i metodi irrigui. Vengono inoltre descritte le più recenti tecniche finalizzate al risparmio e all’uso efficiente e sostenibile della risorsa idrica, considerando anche il tema della qualità delle acque per uso irriguo e delle tecniche di utilizzo delle acque non convenzionali.
Il capitolo si conclude con l’illustrazione della risposta delle colture all’irrigazione, e dei criteri di programmazione irrigua in funzione della specie.
Per una migliore comprensione degli argomenti trattati si consiglia lo studio propedeutico di quanto contenuto nei capitoli 2, 3 e 5
INFLUENZA DEL REGIME IRRIGUO SULLA PRODUZIONE DEL SORGO ZUCCHERINO (SORGHUM VULGARE L. VAR. SACCHARATUM) COLTIVATO IN AMBIENTE MERIDIONALE.
No full textEFFICIENZA NELL’USO DELL’ACQUA DI ALCUNE COLTURE ERBACEE SOTTOPOSTE A DIFFERENTI REGIMI IRRIGUI: VALUTAZIONE A LIVELLO DI PIENO CAMPO
No full textSimulation 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
Studio di alcuni indici di stress idrico su coltura di sorgo zuccherino. (Sorghum vulgare Pers).
No full textCONFRONTO TRA VARIETA’ DI GIRASOLE A DIVERSA PRECOCITA’ IN CONDIZIONI DI SUSSIDIO IDRICO LIMITATO
No full textAnnata Basilicata 198
Influence of crop rotations crop residues ploughing in end mineral fertilization on wheat yield
No full textIntern 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
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