196,029 research outputs found
ANALYSIS OF MICROWAVE ABSORBING PROPERTIES OF EPOXY MWCNT COMPOSITES
No full textIn the ongoing search for new materials for microwave absorption applications, Carbon Nanotubes deserve a special consideration due to their outstanding properties. In this paper, microwave absorbing properties of epoxy resin based composites containing commercial MultiWalled Carbon Nanotubes used as fillers have been analyzed. The complex permittivity of the composites was measured in a wide frequency band (3-18 GHz). The absorbing properties of a single-layer absorber backed by a metallic plate considering several concentration of CNTs was simulated taking into account the measured permittivit
Microwave Absorbing Properties of Multi Walled Carbon Nanotubes
No full textIn the ongoing search for new materials for microwave absorption applications, carbon nanotubes (CNTs) merit a special consideration due to their outstanding properties. In this paper, the microwave absorbing properties of several commercial Multi Walled Carbon Nanotubes (MWCNTs) used as filler in Epoxy resin have been analyzed. The complex permittivity of the composites prepared with four types of MWCNT's has been experimentally determined. The data were used to calculate the reflection coefficient of a single-layer absorber backed by a metallic plate calculated for 0.1% and 0.5% concentration of CNT
Microwave Absorption Properties in Epoxy Resin Multi Walled Carbon Nanotubes Composites
No full textIn the ongoing search for new materials for microwave absorption applications, carbon nanotubes (CNTs) deserve a special consideration due to their outstanding properties. In this paper, the microwave absorbing properties of epoxy resin based composites containing three different types of commercial Multi Walled Carbon Nanotubes (MWCNTs) used as fillers have been analyzed. The complex permittivity of the composites has been experimentally determined. These data were used to simulate the absorbing properties in the frequency band 3-18 GHz of a single-layer absorber backed by a metallic plate considering several concentration of CNT
Investigation of epoxy resin/multiwalled carbon nanotube nanocomposite behavior at low frequency
No full textIn this work, the electrical characterization of nanocomposites made of epoxy resins with multiwalled carbon nanotubes is presented. As the filler, two different types of multiwalled carbon nanotubes with different aspect ratios (280, 1250) and defectiveness were selected. The production procedure, the morphological characterization, the I-V DC characteristics, and the low frequency complex permittivity (in the range 100 kHz-12 MHz) of these nanocomposites are discussed. To investigate the dispersion of the solution, a study which linked the mixing time to the zeta potential was performed. The experimental results show that with the same matrix and by using the same measurement techniques, the two nanocomposites give different results and can be correlated with the characteristics of nanotubes. The dc conductivity of the nanocomposites was measured by means of a two-point probe technique. The conductivity in the frequency range 100 KHz-12 MHz was evaluated using a circular disk capacitor and measuring the impedance. The measured conductivity follows a percolation scaling law of the form r } (p pc)t. A best fit to the measured conductivity data was obtained and the values of the exponent t compared to those in the literature
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
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