196,161 research outputs found
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
Get PDFWe 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
Laser-induced self-organization of nanocomposite films
No full textInternational audienceLaser technology has become a pivotal tool for engineering materials at the nanoscale to achieve specific optical properties. In particular, metal-dielectric nanocomposite thin films present a unique opportunity for manipulation via laser-induced mechanisms. These mechanisms, which can be applied over large areas, allow for the precise control of the material's statistical properties through various physico-chemical processes.Our nanocomposite films consist of Ag nanoparticles embedded in a TiO2 matrix. When exposed to laser irradiation, these nanoparticles can undergo significant transformations. The laser energy can reshape, resize, and reorder nanoparticles through self-organization mechanisms that operate over areas as wide as the laser beam size with sub-wavelength periods.1 This reorganization is driven by the laser ability to locally heat the material, promoting atomic mobility, growth and coalescence mechanisms, and the excitation of surface or guided modes propagating parallel to the surface plane. The high temperature rise can also result in a phase change in the crystal structure of the dielectric matrix and modify its thickness.Continuous wave (cw), femtosecond (fs), and nanosecond (ns) pulse laser beams each interact with the material in distinct ways. From a thermal point of view, cw lasers exhibit the most surprising behaviour with a maximum temperature rise in the material increasing when decreasing the deposited energy.2 The behaviour results from the interplay between optically and thermally activated mechanisms. Fs and ns lasers deliver energy in short, intense pulses that can lead to rapid, localized heating and cooling cycles. These cycles are advantageous for inducing specific changes without overheating the entire film, thus preserving the integrity of the nanocomposite and the substrate.3 Self-organization mechanisms are observed for all types of lasers. They are triggered by the excitation, by scattering at Ag nanoparticles, of optical modes propagating parallel to the surface plane (Figure 1). Irrespective of the excited mode, the period of the resulting self-organized structures is determined by the period of the interference pattern arising from the superposition of the incident wave and the wave propagating along the surface.3 The period is thus a fraction of the laser wavelength where the fraction is the effective refractive index of the excited optical mode. The orientation of the nanostructure is related to the nature of the excited optical mode, which sets the condition for the positive feedback loop that initiates the self-enhanced growth of a periodic structure. The experimental results will highlight the presence of two types of structures resulting from the direct laser processing of the nanocomposite films.The resulting modifications have a direct impact on the optical properties of the films.4,5 These tailored optical properties are especially useful for producing visual effects that are not only striking but also extremely difficult to replicate, making them ideal for security applications. By utilizing nanostructured patterns produced by laser, one can create secure images that are integral to anti-counterfeiting measures. Such images, often used in security printing, contain features that are visible only under specific lighting conditions or viewing angles.The diffractive and dichroic properties of these nanostructures are also investigated. Recent advancements have shown that full-color images can be drawn on these films using pulsed lasers, a technique that offers tremendous potential for security printing.6 These images can incorporate microscopic details and color changes that are virtually impossible to duplicate without access to the same highly specialized laser technology.In conclusion, the ability of lasers to modify materials at the nanoscale presents a significant opportunity for developing new materials with customized properties. The intricate interplay of physical and chemical mechanisms activated by laser irradiation enables the precise tuning of optical characteristics, making this technology indispensable in fields ranging from security printing to advanced optical devices. As research continues to evolve, the potential applications of laser-modified materials are bound to expand, opening up new frontiers in material science and nanotechnology.References1.Z. Liu, T. Epicier, Y. Lefkir, G. Vitrant, N. Destouches, J. Microsc. 2017, 266 (1), 60-68.2.H. Ma, S. Bakhti, A. Rudenko, F. Vocanson, D. S. Slaughter, N. Destouches, T. Itina, J. Phys. Chem. C 2019, 123, 25898−25907.3.Z. Liu, J. Siegel, M. Garcia-Lechuga, T. Epicier, Y. Lefkir, S. Reynaud, M. Bugnet, F. Vocanson, J. Solis, G. Vitrant, N. Destouches, ACS Nano 2017, 11 (5), 5031–5040. 4.N. Destouches, N. Sharma, M. Vangheluwe, N. Dalloz, F. Vocanson, M. Bugnet, M. Hébert, J. Siegel , Adv. Func. Mater. 2021, 31, 2010430.5.N. Dalloz, V. D. Le, M. Hébert, B. Eles, M. A. Flores Figueroa, C. Hubert, H. Ma, N. Sharma, F. Vocanson, S. Ayala, N. Destouches, Adv. Mater. 2022, 34, 2104054.6.V. D. Le, B. Eles, N. Dalloz, M. A. Flores Figueroa, F. Vocanson, C. Hubert, N. Destouches, ACS Appl. Opt. Mater. 2024 , 2, 3, 373–385
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
Laser-induced self-organization of nanocomposite films
No full textInternational audienceLaser technology has become a pivotal tool for engineering materials at the nanoscale to achieve specific optical properties. In particular, metal-dielectric nanocomposite thin films present a unique opportunity for manipulation via laser-induced mechanisms. These mechanisms, which can be applied over large areas, allow for the precise control of the material's statistical properties through various physico-chemical processes.Our nanocomposite films consist of Ag nanoparticles embedded in a TiO2 matrix. When exposed to laser irradiation, these nanoparticles can undergo significant transformations. The laser energy can reshape, resize, and reorder nanoparticles through self-organization mechanisms that operate over areas as wide as the laser beam size with sub-wavelength periods.1 This reorganization is driven by the laser ability to locally heat the material, promoting atomic mobility, growth and coalescence mechanisms, and the excitation of surface or guided modes propagating parallel to the surface plane. The high temperature rise can also result in a phase change in the crystal structure of the dielectric matrix and modify its thickness.Continuous wave (cw), femtosecond (fs), and nanosecond (ns) pulse laser beams each interact with the material in distinct ways. From a thermal point of view, cw lasers exhibit the most surprising behaviour with a maximum temperature rise in the material increasing when decreasing the deposited energy.2 The behaviour results from the interplay between optically and thermally activated mechanisms. Fs and ns lasers deliver energy in short, intense pulses that can lead to rapid, localized heating and cooling cycles. These cycles are advantageous for inducing specific changes without overheating the entire film, thus preserving the integrity of the nanocomposite and the substrate.3 Self-organization mechanisms are observed for all types of lasers. They are triggered by the excitation, by scattering at Ag nanoparticles, of optical modes propagating parallel to the surface plane (Figure 1). Irrespective of the excited mode, the period of the resulting self-organized structures is determined by the period of the interference pattern arising from the superposition of the incident wave and the wave propagating along the surface.3 The period is thus a fraction of the laser wavelength where the fraction is the effective refractive index of the excited optical mode. The orientation of the nanostructure is related to the nature of the excited optical mode, which sets the condition for the positive feedback loop that initiates the self-enhanced growth of a periodic structure. The experimental results will highlight the presence of two types of structures resulting from the direct laser processing of the nanocomposite films.The resulting modifications have a direct impact on the optical properties of the films.4,5 These tailored optical properties are especially useful for producing visual effects that are not only striking but also extremely difficult to replicate, making them ideal for security applications. By utilizing nanostructured patterns produced by laser, one can create secure images that are integral to anti-counterfeiting measures. Such images, often used in security printing, contain features that are visible only under specific lighting conditions or viewing angles.The diffractive and dichroic properties of these nanostructures are also investigated. Recent advancements have shown that full-color images can be drawn on these films using pulsed lasers, a technique that offers tremendous potential for security printing.6 These images can incorporate microscopic details and color changes that are virtually impossible to duplicate without access to the same highly specialized laser technology.In conclusion, the ability of lasers to modify materials at the nanoscale presents a significant opportunity for developing new materials with customized properties. The intricate interplay of physical and chemical mechanisms activated by laser irradiation enables the precise tuning of optical characteristics, making this technology indispensable in fields ranging from security printing to advanced optical devices. As research continues to evolve, the potential applications of laser-modified materials are bound to expand, opening up new frontiers in material science and nanotechnology.References1.Z. Liu, T. Epicier, Y. Lefkir, G. Vitrant, N. Destouches, J. Microsc. 2017, 266 (1), 60-68.2.H. Ma, S. Bakhti, A. Rudenko, F. Vocanson, D. S. Slaughter, N. Destouches, T. Itina, J. Phys. Chem. C 2019, 123, 25898−25907.3.Z. Liu, J. Siegel, M. Garcia-Lechuga, T. Epicier, Y. Lefkir, S. Reynaud, M. Bugnet, F. Vocanson, J. Solis, G. Vitrant, N. Destouches, ACS Nano 2017, 11 (5), 5031–5040. 4.N. Destouches, N. Sharma, M. Vangheluwe, N. Dalloz, F. Vocanson, M. Bugnet, M. Hébert, J. Siegel , Adv. Func. Mater. 2021, 31, 2010430.5.N. Dalloz, V. D. Le, M. Hébert, B. Eles, M. A. Flores Figueroa, C. Hubert, H. Ma, N. Sharma, F. Vocanson, S. Ayala, N. Destouches, Adv. Mater. 2022, 34, 2104054.6.V. D. Le, B. Eles, N. Dalloz, M. A. Flores Figueroa, F. Vocanson, C. Hubert, N. Destouches, ACS Appl. Opt. Mater. 2024 , 2, 3, 373–385
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
Get PDFFollowing 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
Intern experience at CH���M Hill, Inc.: an internship report
Get PDFIncludes 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
Transition to turbulence in a qblique shock-wave/boundary-layer interaction at M=15
No full textDirect numerical simulations are carried out for different forcing techniques to trigger transition during the interaction between an oblique shock-wave and a laminar boundary-layer at M = 1.5. Three forcing methods are used: a) forcing of oblique unstable modes, whose shape and behaviour are determined by the local linear stability theory, b) broadband free-stream acoustic disturbances, and c) a cold plasma flow control device. While the oblique-mode breakdown is dominant for low-amplitude forcing, long streaky structures drive the transition process in a high-amplitude disturbance environment. LES are also performed on the experimental setup by the Institute of Theoretical and Applied Mechanics (ITAM) from Novosibirsk State University with cold plasma actuation. As well as the disturbance type, the effect of Reynolds number and forcing amplitude will be investigated
Letter from Cedrick M. Shimo to the Office of Redress Administration, June 4, 1991
No full textA letter from Cedrick M. Shimo to the Office of Redress Administration arguing that John Y. Udaka is entitled to a redress payment.These materials are from box 73 and 74 of the Frank Chin Papers. The Frank Chin Papers contain personal and professional correspondence between Frank Chin and Michi Weglyn relating to particular projects on which either author was working as well as files related to the Day of Remembrance Tribute to Michi Weglyn
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