196,017 research outputs found
Effect of wood ash on soil chemistry of a pine stand in Northern Germany
No full textAddition of wood ash to acid soils will affect the soil chemistry of forests in a number of ways which were assessed for a pine stand in northern Germany. A field experiment was carried out in a fifty-year old pine stand on a sandy Podzol at Fuhrberg (Luneburger Heide, Lower Saxony/Germany) which involved depositing wood ash (2.4 t ha(-1)) on the surface. Soil solution chemistry was investigated monthly at different depths for 24 months. Prior to and 19 months after the ash addition, exchangeable cations and amounts of heavy metals were determined at different depths. Two to four months after addition of wood ash, maximum mean concentrations in the soil solution of Ca were 240 mu mol l(-1) at 0 cm (surface of mineral soil) and 100 mu mol l(-1) at 100 cm and of K 980 mu mol l(-1) and 140 mu mol l(-1), respectively. The pH values in soil solutions dropped temporarily by 0.3 units at 0 and 10 cm depth. Nitrate concentrations increased at all depths and maximum mean concentration was 230 mu mol l(-1) at 100 cm. Concentrations of Pb and Cr in soil solution did not change significantly (p < 0.05) after ash addition. Concentrations of Cd and Zn increased significantly at some depths but stayed well below the legal limit for drinking water and below the limits given by the German recommendation for soil conservation. Nineteen months after ash addition, the cation exchange capacity (corrected for the release of cations from the ash) of the upper 6 cm of the organic layer was almost doubled and amounts of exchangeable Ca and Mg increased significantly in the upper 8 cm of the organic layer. Amounts of Zn were increased in the entire organic layer, but changes were significant only in the upper 4 cm. The results of is study suggest that ash from untreated wood (using modest additions) may be recommended for amelioration of forest soils
Effects of lime and wood ash on soil-solution chemistry, soil chemistry and nutritional status of a pine stand in Northern Germany
No full textLime and wood ash may be useful to improve acidic forest soils. A field experiment was conducted in a pine stand on a sandy podzol at Fuhrberg, Germany, which involved an application of dolomitic lime (3 t ha(-1)) with three replications or wood ash (4.8 t ha(-1)) without replications on the forest floor. During the 2 yr study period, lime affected the soil solution composition only slightly. Ash had a marked effect on solution chemistry of the mineral soil at 10 cm and the pH values dropped temporarily from 3.7 to 3.1. Nineteen months after the treatments, exchangeable calcium in the organic layer and mineral soil increased by 222 (lime addition) or 411 kg ha(-1) (ash addition) and exchangeable magnesium increased by 101 (lime addition) or 39 kg ha(-1) (ash addition). After ash addition, no marked change in heavy metal content was found below 4 cm of the organic layer. In the ash treatment, the potassium concentration of the 1-yr-old pine needles increased from 5.6 to 5.9 g kg(-1). This study suggests that ash from untreated wood may be recommended for amelioration of forest soils
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
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
La Réaction Poètique of a Prepared Mind
No full text[EN] This paper explores Le Corbusier’s practice of collecting and studying everyday objects as inspiration for new
architectural ideas. An avid collector of ‘objets trouves’ that Le Corbusier referred to specifically as ‘objets à réaction
poètique,’ he promoted their use claiming they gave direction to an imagination that alone might not be able to detect.
Perhaps the most famous object in Le Corbusier’s collection was a crab shell that he used as inspiration for the design of the
roof for his Notre-Dame du Haut chapel in Ronchamp, France. Although Le Corbusier’s use of this shell is well documented
in studies on his oeuvre, little attention has been given to the role he intended found objects to play in his design process. In
themselves these objects, which have their own identities as shells, pinecones or pieces of bone, they do not immediately lend
themselves to any architectural solution. Rather, they are evidence of Le Corbusier’s unique approach to design that relies on
a what Louis Pasteur referred to as a ‘prepared mind,’ availed of all relevant data and information pertaining to a task, that
can search for solutions in random object or events by spontaneously shift back and forth between analytic and associative
modes of thought.Mindrup, M. (2016). La Réaction Poètique of a Prepared Mind. En LE CORBUSIER. 50 AÑOS DESPUÉS. Editorial Universitat Politècnica de València. 1466-1473. https://doi.org/10.4995/LC2015.2015.677OCS1466147
Remote practices : architecture at a distance /
No full textAs advancements in transportation and technology continue to close the gap between architect, client, builder and site, critique and place, this book considers how architects, designers, theorists, and critics design, describe and critique future and past constructions in absentia. This book engages with remote practice, providing students, academics and professionals with the understanding and tools they need to rethink the role of the distant and disconnected in making, thinking and writing architecture — a skill which is becoming increasingly important in contemporary education and practice. Bringing together a collection of 16 essays and creative works from a diverse and respected group of scholars and designers, this book reflects upon the challenges and opportunities which remote practices occasion in architecture. Part One: Practice and Pedagogy investigates how a range of technological and economic advancements continue to redefine notions of connectedness in the practice of architecture at a distance and explores what it means to teach and study architecture at a distance from peer and place. Part Two: Critique and Performativity consists of a wide range of questions that unpack notions about situatedness, subjectivity, the body in space, and what occurs when disparate things are suddenly made proximate. The essays and creative works enable thematic as well as historically and culturally contextual understanding of the topic, highlighting important connections and changes across time.In Praise of the Remote, M. Mindrup; Part One: Practice and Pedagogy. Introduction; Toward a Political Ecology of Architecture, J. Ockman; Origins of Remote and Global Architectural Practices, P. Emmons; On the Remoteness of CAD's Gesture, J. Crow; Extreme Interiority, N. Cridge; Learning from Distance, L. Landrum; Epistolary Architecture, Despland-Lichtert & Sullivan Shea; 'Professionalism' and Care in a Pandemic Year, N. Stead; Fresh Eyes, M. Mindrup & J. LaCoe. Part Two: Critique and Performativity. Introduction; Seven Studies for 'A Holding', J. Rendell; Critical Proximities, C. Smith; The Making of Informated Space, I. Sotiriou; An Emotional Critique of Remote Practices, P. Ursprung; Drawing IN, B. Mitchell; A Digital Table to Eat Together, G. Aquije Zegarra; The Making of Blind Spot, Film Place Collective; Amidst: Afterimage, Affect, Architecture, L. Chee; ConclusionAs advancements in transportation and technology continue to close the gap between architect, client, builder and site, critique and place, this book considers how architects, designers, theorists, and critics design, describe and critique future and past constructions in absentia. This book engages with remote practice, providing students, academics and professionals with the understanding and tools they need to rethink the role of the distant and disconnected in making, thinking and writing architecture — a skill which is becoming increasingly important in contemporary education and practice. Bringing together a collection of 16 essays and creative works from a diverse and respected group of scholars and designers, this book reflects upon the challenges and opportunities which remote practices occasion in architecture. Part One: Practice and Pedagogy investigates how a range of technological and economic advancements continue to redefine notions of connectedness in the practice of architecture at a distance and explores what it means to teach and study architecture at a distance from peer and place. Part Two: Critique and Performativity consists of a wide range of questions that unpack notions about situatedness, subjectivity, the body in space, and what occurs when disparate things are suddenly made proximate. The essays and creative works enable thematic as well as historically and culturally contextual understanding of the topic, highlighting important connections and changes across time.Van Gerrewey, Christoph
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
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