178,856 research outputs found
Dennis W. Laughlin
No full textThe Oklahoma A&M College World War I Veterans collection captures the memories and experiences of the men and women of Oklahoma Agricultural and Mechanical College who served in World War I. In 1919, a project headed by Maude Cass, the editor of the 1919 Redskin; Professor Maroney of the Department of History; Margaret Walters, Librarian; and J.W. Cantwell, the College President, was undertaken to survey these veterans. The surveys were returned along with photographs, letters, and newspaper clippings documenting these veterans’ experiences during World War I
Oral history with Dr. David Laughlin; 4/18/2012
No full textOral history; interview with Dr. David Laughlin, Professor Emeritus of Agricultural Economics, April 18, 2012, Mitchell Memorial Library, Mississippi State University. Laughlin earned his Bachelor\u27s and Master\u27s degrees from Mississippi State from 1969 through 1977, and his PhD from Texas A&M University, graduating in 1980, and returning to MSU. He has been an MSU faculty member since his return in 1980 until his retirement in 2006. He has served as a Researcher for the Mississippi Agricultural and Forestry Experiment Station and also as Coordinator for the USDA-funded Advanced Spatial Technologies in Agriculture Project. During his work with MAFES he conducted many research projects, often based on client requests for more productive farming. He also authored and co-authored many MAFES Information Bulletins. Laughlin has also served as Secretary-Treasurer of the Mississippi Agricultural Economics Association. In this interview, he discusses the history of computer work and communication in the Lloyd-Ricks-Watson building, and the faculty who made the building a special place to be
How many focus markers are there in Konkomba?
No full textThis article discusses the divergent status of the two particles lé and lá in the grammar of Konkomba, a Gur language (Niger-Congo) of the Gurma subgroup. While previous studies claim that both particles are focus markers, this author argues that only the particle lá should be analyzed as a pure pragmatic device. Distributional studies suggest that the use of particle lé, on the other hand, is only required under specific focus conditions, and primarily represents a syntactic device
Interactive effects of physical factors and hydrocarbon exposure on the survival, development rate and growth of the mud crab Rhithropanopeus harrisii and the horseshoe crab Limulus polyphemus
No full textVita.Embryos and juveniles of the horseshoe crab, Limulus polyphemus were exposed continuously to 0, 5, 10, 25 and 50% Water-Soluble Fractions (WSF) of no. 2 fuel oil at temperatures of 20��, 25�� or 30�� C and one salinity, 32 o/oo S. Exposure lasted four months. Cumulative survival was highest at 30�� C and decreased with temperature. The eggs and trilobite larvae were the most sensitive stages. Respiration rates were determined for first-tailed stage animals. A multifactorial design of the three rearing temperatures and salinities of 32 o/oo S (rearing salinity), 20 and 10 o/oo S (hypoosmotic shock salinity) were used. Enough animals survived at 0, 5 and 10% WSF for complete factorial replication. The respiration rates of controls (0% WSF) did not change markedly with salinity. Q������'s for acclimated animals were 2.1, but at 10 and 20 o/oo S they were 1.8 and 1.3, respectively, for the temperature interval from 20 to 30�� C. The Q������'s for exposed animals given hypoosmotic shock were greater than 2 and mean respiration rates were higher than those for controls. In a second experiment, larval stages of the mud crab, Rhithropanopeus harrisii were exposed continuously from hatching to 0, 5, 10, 15, and 20% WSF of no. 2 fuel oil for 11 months. The zoeal stages were the most sensitive part of the life cycle. Survival, growth and development rates of crab stages were relatively insensitive to continued WSF exposure. At the end of one year, surviving experimentals produced viable eggs. In a third experiment, the zoeal stages of the mud crab, Rhithropanopeus harrisii were exposed separately to phenanthrene or naphthalene in a factorial combination with three temperatures and salinities. Phenanthrene was much more toxic than naphthalene.
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
Breedlove, D. E. & R. M. Laughlin. — The Flowering of Man. A Tzotzil Botany of Zinacantan
No full textPuig Henri. Breedlove, D. E. & R. M. Laughlin. — The Flowering of Man. A Tzotzil Botany of Zinacantan. In: Journal de la Société des Américanistes. Tome 81, 1995. pp. 356-358
You shall know a species by the company it keeps: Leveraging co-occurrence data to improve ecological prediction
No full textAim: Making predictions about species, including how they respond to environmental change, is a central challenge for ecologists. Because of the huge number of species, ecologists seek generalizations based on species’ traits and phylogenetic relationships, but the predictive power of trait-based and phylogenetic models is often low. Species co-occurrence patterns may contain additional information about species’ ecological attributes not captured by traits or phylogenies. We propose using a novel ordination technique to encode the information contained in species co-occurrence data in low-dimensional vectors that can be used to represent species in ecological prediction. Method: We present an efficient method to derive species vectors from co-occurrence data using Global Vectors for Word Representation (GloVe), an unsupervised learning algorithm originally designed for language modelling. To demonstrate the method, we used GloVe to generate vectors for nearly 40,000 plant species using co-occurrence statistics derived from sPlotOpen, an open-access global vegetation plot database, and tested their ability to predict elevational range shifts in European montane plant species. Results: Co-occurrence-based species vectors were weakly correlated with traits or phylogeny, indicating that they encode unique information about species. Models including co-occurrence-based vectors explained twice as much variation in species range shifts as models including only traits or phylogenetic information. Conclusions: Given the widespread availability of species occurrence data, species vectors learned from co-occurrence patterns are a widely applicable and powerful tool for encoding ecological information about species, with many potential applications for describing and predicting the ecology of species, communities and ecosystems
One-particle density of laughlin states at finite N
No full textThe most robust fractional quantum Hall states occur in the lowest Landau level at filling factors, 1/3 and 1/5. Such states are very well described by Laughlin\u27s wave function. In this work, we have succeeded in calculating exactly the one-particle density function of the Laughlin states for some finite systems of particles in a disk geometry. The exact results we provide are not only important for the Laughlin states, but also for the general field of numerical calculations because they can serve as benchmarks to test the accuracy of various approaches, numerical schemes and computational methods used in studies of strongly correlated electronic systems. © 2011 World Scientific Publishing Company
Energy projection and modified Laughlin states
No full textWe develop a method to efficiently calculate trial wave functions for quantum Hall systems which involve projection onto the lowest Landau level. The method essentially replaces the lowest Landau level projection by projection onto the M lowest eigenstates of a suitably chosen Hamiltonian acting within the lowest Landau level. The resulting “energy projection” is a controlled approximation to the exact lowest Landau level projection which improves with increasing M. It allows us to study the projected trial wave functions for system sizes close to the maximal sizes that can be reached by exact diagonalization and can be straightforwardly applied in any geometry. As a first application and test case, we study a class of trial wave functions first proposed by Girvin and Jach [Girvin and Jach, Phys. Rev. B 29, 5617 (1984)], which are modifications of the Laughlin states involving a single real parameter. While these modified Laughlin states probably represent the same universality class exemplified by the Laughlin wave functions, we show by extensive numerical work for systems on the sphere and torus that they provide a significant improvement of the variational energy, overlap with the exact wave function and properties of the entanglement spectrum
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