196,567 research outputs found
Contact and cooperation in the Belgian fertility and family survey.
No full textCooperation; Fertility and family survey;
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
Electron Magnetic Resonance and Density Functional Theory Study of Room Temperature X-Irradiated β-d-Fructose Single Crystals
No full textStable free radical formation in fructose single crystals X-irradiated at room temperature was investigated using Q-band electron paramagnetic resonance (EPR), electron nuclear double resonance (ENDOR), and ENDOR induced EPR (EIE) techniques. ENDOR angular variations in the three main crystallographic planes allowed an unambiguous determination of 12 proton HFC tensors. From the EIE studies, these hyperfine interactions were assigned to six different radical species, labeled F1−F6. Two of the radicals (F1 and F2) were studied previously by Vanhaelewyn et al. [Vanhaelewyn, G. C. A. M.; Pauwels, E.; Callens, F. J.; Waroquier, M.; Sagstuen, E.; Matthys, P. J. Phys. Chem. A 2006, 110, 2147.] and Tarpan et al. [Tarpan, M. A.; Vrielinck, H.; De Cooman, H.; Callens, F. J. J. Phys. Chem. A 2009, 113, 7994.]. The other four radicals are reported here for the first time and periodic density functional theory (DFT) calculations were used to aid their structural identification. For the radical F3 a C3 carbon centered radical with a carbonyl group at the C4 position is proposed. The close similarity in HFC tensors suggests that F4 and F5 originate from the same type of radical stabilized in two slightly different conformations. For these radicals a C2 carbon centered radical model with a carbonyl group situated at the C3 position is proposed. A rather exotic C2 centered radical model is proposed for F6
Nonresponse in the Belgian fertility and family survey.
No full textCombining response data from the Belgian Fertility and Family Survey with individual level and municipality level data from the 1991 Census for both nonrespondents and respondents, multilevel logistic regression models for contact and cooperation propensity are estimated. The covariates introduced are a selection of indirect features out of the researcher control only. Contrary to previous research, Socio Economic Status is found to be positively related to cooperation. Another unexpected result is the absence of any considerable impact of ecological correlates such as urbanicity.Cooperation; Data; Design; Fertility and family survey; Logistic regression; Mixture experiment; Model; Models; Multilevel analysis; Nonrespons; Optimal; Optimal design; Process variables; Processes; Qualitative variables; Selection; Split-plot experiment; Variables;
Electron magnetic resonance and density functional theory study of room temperature X-irradiated β-D-fructose single crystals
No full textStable free radical formation in fructose single crystals X-irradiated at room temperature was investigated using Q-band electron paramagnetic resonance (EPR) electron nuclear double resonance (ENDOR) and ENDOR Induced EPR (EIE) techniques ENDOR angular variations in the three main crystallographic planes allowed an unambiguous determination of 12 proton HFC tensors From the EIE studies these hyperfine interactions were assigned to six different radical species labeled F1-F6 Two of the radicals (F1 and F2) were studied previously by Vanhaelewyn et al [Vanhaelewyn G C A M Pauwels E Callens F J Waroquier, M Sagstuen E Matthys, P J Phys Chem A 2006 110, 2147] and Tarpan et al [Tarpan M A Vrielinick H De Cooman H Callens F J J Phys Chem A 2009 113 7994] The other four radicals arc reported here for the first time and periodic density functional theory (DFT) calculations were used to aid their structural identification For the radical F3 a C3 carbon centered radical with a carbonyl group at the C4 position is proposed The close similarity in HFC tensors suggests that 14 and F5 originite from the same type of radical stabilized in two slightly different conformations For these radicals a C2 carbon centered radical model with a carbonyl group situated at the C3 position is proposed A rather exotic C2 centered radical model is proposed for F
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
Radicals in Sucrose Single Crystals Induced by X-rays at Different Temperatures: a Combined EPR and DFT Study
No full textUnderstanding the nature of radiation-induced defects in sugar compounds is of importance for dosimetry purposes as well as in the radiation chemistry of DNA. Sucrose (table sugar) is of particular interest for nuclear emergency dosimetry because of its widespread use, its radiation sensitivity, the stability of the induced radicals, and its linear dose response up to 104 Gy. Recent dosimetric studies suggest sugar to be the best, universal material for EPR- (Electron Paramagnetic Resonance) and/or UV-dosimetry in the region 0.44-160 kGy. In sugars and sugar derivatives, X-rays initially create various types of defects which then transform into the final, stable radical products through a generally complex multi-step process. Ultimately, an advanced understanding of the radiation-induced processes in these materials could aid in establishing dosimetry protocols and provide more insight into the exact role of sugar radicals in the radiation chemistry of DNA.
Electron Magnetic Resonance (EMR) experiments on sugar single crystals allow for characterisation of the radicals in a detailed way via hyperfine interactions of the unpaired electron spin with the lattice 1H nuclear spins. The last couple of years, highly accurate Density Functional Theory (DFT) calculations on extended organic solid state systems have become feasible due to advances in computing power and density functionals as well as to the development of new codes for the calculation of EMR parameters. Combining these experimental and theoretical tools has already proven to be a very powerful approach to study the radiation chemistry of sugars [1-3].
We present the results of EMR experiments performed on sucrose single crystals at different temperatures, from 10 K up to room temperature, after in situ irradiation at these temperatures, and of subsequent annealing experiments. Through comparison of experimental and computational DFT results, the most prominent radicals are identified and information is obtained on their formation mechanism. Among others, our study reveals the structure of the three predominant radicals stable at room temperature, that are most relevant in the context of dosimetry.
1. Identification and Conformational Study of Stable Radiation-Induced Defects in Sucrose Single Crystals using Density Functional Theory Calculations of Electron Magnetic Resonance Parameters, De Cooman, H.; Pauwels, E.; Vrielinck, H.; Sagstuen, E.; Callens, F.; Waroquier, M., J. Phys. Chem. B, accepted.
2. Pauwels, E.;Declerck, R.; Van Speybroeck, V.; Waroquier, M. Radiat. Res. 2008, 169, 8.
3. Tarpan, M.; Sagstuen, E.; Pauwels, E.; Vrielinck, H.; Waroquier, M. and Callens, F. J. Phys. Chem. A, in press, doi:10.1021/jp7119284
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