195,994 research outputs found
Carbon Nanotube Membranes in Water Treatment Applications
No full textCarbon nanotube (CNT)-based membranes combine the promising properties of CNTs with the advantages of membrane separation technologies, offering enhanced membrane performance in terms of permeability and selectivity. This review looks at the existing membrane architectures based on CNTs and their main advantages and disadvantages for water treatment applications. The different types of CNT-based membranes that are reported in the literature are highlighted, as well as their corresponding fabrication methods. Available methodologies for tailoring the final membrane properties and behavior are thoroughly discussed, making special emphasis in chemical modification of the CNT surface. Finally, the most common applications of CNT-based membranes in water treatment are reviewed, including seawater or brine desalination, oil-water separation, removal of heavy metals, and organic pollutants. The main limitations and perspectives of CNT-based membranes are also briefly outlined
Carbon nanotubes for cardiac tissue regeneration: State of the art and perspectives
No full textCarbon nanotubes (CNTs) have appeared in recent years as innovative components for the development of the next-generation scaffolds to regenerate damaged cardiac tissue. The unique robustness, mechanical and electronic properties of CNTs, along with their ease to undergo chemical modification, make them promising candidates for the design of engineered cardiac constructs with ad hoc properties. The integration of CNTs with polymeric scaffolds is a promising strategy for cardiac regeneration since, as reviewed in these pages, their conductivity has a boosting effect on cardiomyocytes behavior, including their synchronous contractility when grown on top of the nanomaterial. More recently, the conductive properties of pure CNTs are attracting interest to design innovative systems based on bare CNTs without using other fillers. Additionally, the elongated CNT morphology is a strategic asset for the mimicry of the anisotropic myocardium structure, and research has made great progress over the production of micropatterned scaffolds with nanoscale definition that aim to recapitulate the cardiac tissue. Overall, engineered CNT constructs are revealing their great potential to develop new platforms able to interface, repair, or boost the performance of cardiac tissue
Carbon Nanostructures in Rotaxane Architectures
No full textMechanically interlocked molecular architectures equipped with different types of carbon nanostructures have been a topic of high interest in the last decades. This minireview reports the research work published in the literature and the main advances that have been realized in rotaxane architectures involving fullerenes and carbon nanotubes
Chemically Cross-Linked Carbon Nanotube Films Engineered to Control Neuronal Signaling
No full textIn recent years, the use of free-standing carbon nanotube (CNT) films for neural tissue-engineering have attracted tremendous attention. CNT films show large surface area and high electrical conductivity that combined to flexibility and biocompatibility may promote neuron growth and differentiation while stimulating neural activity. Besides, adhesion, survival, and growth of neurons can be modulated through chemical modification of CNTs. Axonal and synaptic signaling can also be positively tuned by these materials. Here we describe the ability of free-standing CNT films to influence neuronal activity. We demonstrate that the degree of crosslinking between the CNTs has a strong impact on the electrical conductivity of the substrate, which, in turn, regulates neural circuit outputs
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
Cross-Linked Carbon Nanotube Adsorbents for Water Treatment: Tuning the Sorption Capacity through Chemical Functionalization
No full textThe
development of carbon-based membrane adsorbent materials for
water treatment has become a hot topic in recent years. Among them,
carbon nanotubes (CNTs) are promising materials because of its large
surface area, high aspect ratio, great chemical reactivity, and low
cost. In this work, free-standing CNT adsorbents are fabricated from
chemically cross-linked single-walled CNTs. We have demonstrated that
by controlling the degree of cross-linking, the nanostructure, porous
features, and specific surface area of the resulting materials can
be tuned, in turn allowing the control of the adsorption capacities
and the improvement of the adsorption performance. The cross-linked
CNT adsorbents exhibit a notably selective sorption ability and good
recyclability for removal of organics and oils from contaminated water
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