196,670 research outputs found
The Wild Wild Western Boundary Current: An Observation-Based Journey to Explore the Gulf Stream Off Cape Hatteras, NC
No full textCape Hatteras is the Mason Dixon Line on the U.S. east coast for both Gulf Stream (GS) meander kinematics and shelf water convergence. At Cape Hatteras, the GS leaves the continental margin and transitions from a topographically steered western boundary current on the Blake Plateau into water depths that increase from 2000 m to 4500 m. Along this transition, Deep Western Boundary Current passes beneath the GS. On the shelf, southward moving fresher cooler water of the Mid Atlantic Bight meets the warmer saltier water of the South Atlantic Bight. This confluence of water masses of different densities results in the Hatteras Front and cross-isobath transport that provides a pathway for shelf-deep ocean exchange. The GS plays a prominent role in influencing these and other shelf kinematics and exchange processes.
In addition to the unique physical processes that manifest off Cape Hatteras, this location is also where the GS flows close to land, varies least in position after leaving the Florida Straits, and has surface currents that approach 3 m/s in relatively shallow water making it a location of interest for extracting Marine Hydrokinetic Energy (MHK).
Dr. Muglia will present observation-based discoveries and insights about the complex current confluences off Cape Hatteras NC, GS MHK, and share his fascination with working on and across the GS.
Presenter Bio
Mike Muglia is the Assistant Director of Science and Research for the NC Ocean Energy Program and an Assistant Research Professor at the East Carolina University Coastal Studies Institute on the Outer Banks of NC. Mike holds BS degrees in marine science, biology, and physics, an MS degree in physics, and a Ph.D. in Marine Science from UNC-Chapel Hill. A self-described surf junky, Mike most enjoys working on the ocean
An integrated approach to energy recovery from biomass and waste: anaerobic digestion - gasification - water treatment
No full textThe paper investigates the performance of an integrated system for the energy recovery from biomass and waste based on anaerobic digestion, gasification and water treatment.
In the proposed system, the organic fraction of waste of the digestible biomass is fed into an anaerobic digester, while a part of the combustible fraction of the Municipal Solid Waste is gasified. Thus, the obtained bio-gas and syngas are used as a fuel for running a cogeneration system based on an internal combustion engine to produce electric and thermal power. The waste water produced by the integrated plant is recovered by means of both forward and inverse osmosis.
The different processes as well as the main components of the system are modelled by means of a lumped and distributed parameter approach and the main outputs of the integrated plant such as the electric and thermal power and the amount of purified water are calculated.
Finally, the implementation of the proposed system is evaluated for urban areas with different number of inhabitants and the relating performance is estimated in terms of the main outputs of the system
A quantitative evaluation of osteoblast-osteocyte relationships on growing endosteal surface of rabbit tibiae
No full textScanning electron microscopy (SEM) was used to quantify the intercellular relationships between osteoblasts and osteocytes on the growing endosteal surfaces of the medullary canal of the tibia in four rabbits of different ages. The area of each osteoblast was measured on the SEM micrographs by means of an Image Analyzer. The number of osteocyte cytoplasmic processes was indirectly evaluated by counting the canalicular openings present on the same microscopic fields after the removal of the osteoblasts. The metabolic activity of the osteoblasts was indirectly evaluated from their shape, and the structure was analyzed by transmission electron microscope (TEM) in sections taken from the samples studied by SEM. In all four animals, the surface area of the osteoblasts (OA) was found to vary a great deal, whereas the density of canalicular openings was fairly uniform. Moreover, although the OA mean value increases significantly with the age of the animals, the density of canalicular openings does not; it would therefore appear that the older the animal and the more flattened the osteoblasts, the greater the number of canaliculi beneath them. Since osteoblast activity has previously been shown to be inversely proportional to the area of the protoplasm in contact with the bone surface, it appears that the less active osteoblasts should contact a greater number of osteocyte cytoplasmic processes. These findings suggest that osteocytes might play an important role in modulating osteoblast activity and in recruiting osteoblasts that differentiate into osteocytes, possibly by means of inhibitory signals transmitted via gap junctions.Scanning electron microscopy (SEM) was used to quantify the intercellular relationships between osteoblasts and osteocytes on the growing endosteal surfaces of the medullary canal of the tibia in four rabbits of different ages. The area of each osteoblast was measured on the SEM micrographs by means of an Image Analyzer. The number of osteocyte cytoplasmic processes was indirectly evaluated by counting the canalicular openings present on the same microscopic fields after the removal of the osteoblasts. The metabolic activity of the osteoblasts was indirectly evaluated from their shape, and the structure was analyzed by transmission electron microscope (TEM) in sections taken from the samples studied by SEM. In all four animals, the surface area of the osteoblasts (OA) was found to vary a great deal, whereas the density of canalicular openings was fairly uniform. Moreover, although the OA mean value increases significantly with the age of the animals, the density of canalicular openings does not; it would therefore appear that the older the animal and the more flattened the osteoblasts, the greater the number of canaliculi beneath them. Since osteoblast activity has previously been shown to be inversely proportional to the area of the protoplasm in contact with the bone surface, it appears that the less active osteoblasts should contact a greater number of osteocyte cytoplasmic processes. These findings suggest that osteocytes might play an important role in modulating osteoblast activity and in recruiting osteoblasts that differentiate into osteocytes, possibly by means of inhibitory signals transmitted via gap junctions
Microarchitecture of the cat testis with special reference to Leydig cells. A three-dimensional study by alkali maceration method and scanning electron microscopy.
No full textThis paper describes for the first time the three dimensional organization of Leydig cells in the adult cat. Samples were obtained by castration of inpatients of a University clinics. Testis were macerated with NaOH in order to study either the cells as well as the extracellular matrix of the testis. Leydig cells showed between them a fine canalicular-like system formed by microvilli; this arrangement may favor passage of hormones and growth factors. Collagen fibers, in turn, formed a real three dimensional scaffold around seminiferous tubules and in the testicular lamina propria
A 71-nucleotide deletion in the periaxin gene in an Italian patient with late-onset slowly progressive demyelinating CMT
No full textBackground: Charcot-Marie-Tooth disease (CMT) constitutes a group of heterogeneous hereditary motor and sensor neuropathies. Mutations in the periaxin (PRX) gene cause CMT4F with an autosomal recessive early-onset demyelinating neuropathy and are extremely rare in a non-Romani white population. Methods: We report on a 66-year-old Italian man presenting with slowly progressive and late-onset demyelinating CMT. The molecular analysis was performed using a custom panel containing 39 genes associated with the CMT phenotype. Results: The patient harbored a homozygous PRX 71-nucleotide deletion (c.3286_3356del71, I1096fsX17). Conclusions: This is the first report that describes such a genetic mutation in a population of non-Romani origin
A SEM quantitative-study of osteoblast-osteocyte relationships on endosteal surface of growing rabbits.
No full textThe less active osteoblasts contact a greater number of osteocyte cytoplasmic processes. This fact suggest the hypothesis that osteocytes might exert an inhibitory effect on the secretory activity of osteoblasts
Quantitative aspects on osteoblast-osteocyte relationships.
No full textOsteocytes could modulate osteoblast activity by issuing inhibitory signals
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
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