196,008 research outputs found
Solubility of inert gases and liquid hydrocarbons in water
No full textThe thermodn. statistical model based on the distribution of mol. populations among energy levels has been employed for the anal. of the soly. of hydrocarbons and other inert gases or liqs. in water at different temps. The statistical distribution is described by a convoluted partition function ZG•ζs. The product of a grand canonical partition function ZG represents the distribution of the species in the reaction while the canonical partition function ζs represents the properties of the solvent. The first deriv. of the logarithm of the partition function with respect to 1/T is the apparent enthalpy which is the result of the contributions of the sep. partition functions, {ΔHapp}T = ΔH0 + nwCp,wT, where {ΔHapp}T refers to ZG, nwCp,wT = -ΔHw to ζs and ΔH0 is the change in enthalpy of hydrocarbon-water reaction. The plot {ΔHapp}T vs. T results in a straight line with slope nw at const. Cp,w. The apparent enthalpy is obtained from the coeffs. of the polynomial fitting of the soly. data, as a function of l/T. Alternatively, the apparent enthalpy can be detd. calorimetrically. The enthalpy thus obtained is a linear function of the Kelvin temp. The values of nw range from 1.6, 1.9, 5.6 to 5.8 for helium, hydrogen, butane and hexane, resp. For fluoro compds. the range of nw is 10.1 to 11.1 indicating that nw is a function of the no. of water mols. expelled from the cage of solvent to form a cavity to host the solute mol. The anal. of several sets of calorimetric or soly. data with the present mol. thermodn. model yields values of ΔH0 and nw consistent with the size of the dissolved mols
Calculation of site affinity, cooperativity between sites and self-association in polymer-ligand-proton complexes.
No full textThe statistical probability of state of a solution containing a reacting receptor M, a ligand A (and eventually proton H) is described by a molar partition function Z M = exp(-AGIRT) referred to M, or ZA or Zu, respectively. The partition function for one class of sites can be expressed as the function of site constants kj and cooperativity functions yj.i = exp{bj(i - 1)). Binding in a single class can be represented by a vector Jpctj whose elements correspond to single species. For more classes of sites, the joined probability is obtained as tensor product of single class vectors giving rise to complexation matrices Mpqr. There is one partition function for each component of the system. If the complexes are of type HPMQAR there are three partition functions Z u, Z, and ZA. The relationships between partition functions and total analytical amounts Tu, TM, T, respectively are given. The experimental data obtained in a potentiometric titration with electrode reversible to [H] or other free component can be reproduced as the function of site constants kj and cooperativity functions exp{bj(i - l)} for each class j. The best values of kj and bj, can be calculated following a nonlinear least squares procedure by means of a computer program that is here presented
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
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