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Search Results: 1 - 10 of 223343 matches for " Edson C.;Edwards "
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Dispersing carbon nanotubes in phenolic resin using an aqueous solution
Botelho, Edson C.;Edwards, Elilton R.;Bittmann, Birgit;Burkhart, Thomas;
Journal of the Brazilian Chemical Society , 2011, DOI: 10.1590/S0103-50532011001100004
Abstract: the ability to control the carbon nanotube (cnt) dispersion in polymers is considered the key to most applications of nanotube/polymer composites. the carbon nanotube dispersion into water with different surfactants, as well as its incorporation into phenolic resins, was investigated. ultrasonication of liquid suspensions was used to prepare stable dispersions. in order to evaluate the best surfactant to be used, light scattering and uv-visible spectroscopy were employed. the structure of cnt reinforced of phenolic resin was analyzed in function of the concentration and type of surfactant, sonication power and time. it was also evaluated the influence in the dispersion by using the glass temperature transition properties being obtained by dynamic mechanical analyses and impact energy.
A simplification of D'Alarcao's idempotent separating extensions of inverse semigroups
Constance C. Edwards
International Journal of Mathematics and Mathematical Sciences , 1978, DOI: 10.1155/s0161171278000393
Abstract: In [2] D'Alarcao states necessary and sufficient conditions for the attainment of an idempotent-separating extension of an inverse semigroup. To do this D'Alarcao needed essentially three mappings satisfying thirteen conditions. In this paper we show that one can achieve the same results with two mappings satisfying eight conditions.
A new renormalization group approach for systems with strong electron correlation
Khan Edwards,Alex C Hewson
Physics , 2011, DOI: 10.1088/0953-8984/23/4/045601
Abstract: The anomalous low energy behaviour observed in metals with strong electron correlation, such as in the heavy fermion materials, is believed to arise from the scattering of the itinerant electrons with low energy spin fluctuations. In systems with magnetic impurities this scattering leads to the Kondo effect and a low energy renormalized energy scale, the Kondo temperature $T_{\rm K}$. It has been generally assumed that these low energy scales can only be accessed by a non-perturbative approach due to the strength of the local inter-electron interactions. Here we show that it is possible to circumvent this difficulty by first suppressing the spin fluctuations with a large magnetic field. As a first step field-dependent renormalized parameters are calculated using standard perturbation theory. A renormalized perturbation theory is then used to calculate the renormalized parameters for a reduced magnetic field strength. The process can be repeated and the flow of the renormalized parameters continued to zero magnetic field. We illustrate the viability of this approach for the single impurity Anderson model. The results for the renormalized parameters, which flow as a function of magnetic field, can be checked with those from numerical renormalization group and Bethe ansatz calculations.
Hot Blast Flow Measurement in Blast Furnace in Straight Pipe  [PDF]
Ricardo S. N. Motta, Edson C. Bortoni, Luiz E. Souza
Modern Instrumentation (MI) , 2013, DOI: 10.4236/mi.2013.24010

This article shows an innovative method to model and validate the hot air flow through the blast furnacés tuyeres. This study will be the basis for flow measurements implementation and safety interlocks for the pulverized coal injection. The flow measurements were taken in the blast furnace down leg pipes by installing refractory Venturi tubes. The system for the calculation of differential pressure takes into consideration the dimension of the Venturi, the air density and compressibility. The objective is to specify the flow transmitters required to automate a control system and implement safety interlocks for the coal injection plant.

Gene-enhanced tissue engineering for dental hard tissue regeneration: (2) dentin-pulp and periodontal regeneration
Paul C Edwards, James M Mason
Head & Face Medicine , 2006, DOI: 10.1186/1746-160x-2-16
Abstract: Part 1 reviewed the principals of gene-enhanced tissue engineering and the techniques of introducing DNA into cells. This manuscript will review recent advances in gene-based therapies for dental hard tissue regeneration, specifically as it pertains to dentin regeneration/pulp capping and periodontal regeneration.The goal of gene-enhanced tissue engineering is to regenerate lost tissue by the local delivery of cells that have been genetically-enhanced to deliver physiologic levels of specific growth factors. The basis for this approach lies in the presence of a population of progenitor cells that can be induced, under the influence of these growth factors, to differentiate into the specific cells required for tissue regeneration, with guidance from local cues in the wound environment [1].From a tissue engineering approach, the oral cavity has significant advantages compared to other sites in the body, including easy access and observability. Potential applications for gene-based tissue engineering therapies in the oral and maxillofacial complex include the delivery of growth factors for periodontal regeneration, pulp capping/dentin regeneration, treatment of malignant neoplasms of the head and neck [2], regeneration for bone grafting of large osseous defects in dental and craniofacial reconstruction (e.g. bone augmentation prior to prosthetic reconstruction, fracture repair, and repair of facial bone defects secondary to trauma, tumor resection, or congenital deformities), and articular cartilage repair [3,4].This manuscript will review recent advances in gene-based therapies for dental hard tissue regeneration, specifically as it pertains to dentin regeneration/pulp capping and periodontal regeneration.The goal of modern restorative dentistry is to functionally and cosmetically restore lost tooth structure. Destroyed coronal tooth structure, most commonly resulting from dental caries, is currently restored using metal or polymer-based materials; primarily silver am
Gene-enhanced tissue engineering for dental hard tissue regeneration: (1) overview and practical considerations
Paul C Edwards, James M Mason
Head & Face Medicine , 2006, DOI: 10.1186/1746-160x-2-12
Abstract: This manuscript will review the principals of gene-enhanced tissue engineering and the techniques of introducing DNA into cells. Part 2 will review recent advances in gene-based therapies for dental hard tissue regeneration, specifically as it pertains to dentin regeneration/pulp capping and periodontal regeneration.Current approaches to tissue regeneration include: (i) the use of passive three-dimensional scaffolds to provide a local environment that is conducive to new tissue formation, (ii) inductive strategies in which additional growth factors are incorporated into a scaffold/matrix to modify cell behavior, and (iii) strategies to form a vital construct of cells, either fully differentiated autologous cells of the desired type, or stem cells that have been isolated and expanded in vitro to restore tissue function.Gene-enhanced tissue engineering (GETE) combines techniques of tissue engineering with gene therapy. Specifically, gene-based therapies involve delivering a specific gene to the target tissue with the goal of changing the phenotype or protein expression profile of the recipient cell [1]. This can stimulate the gene-enhanced cell and/or neighboring uncommitted cells to differentiate into the desired cell and tissue types. One of the principal advantages of this approach is that it provides for a sustained delivery of physiologic levels of the growth factor of interest. This is in contrast to protein delivery systems, which are often hampered by the short half life of the delivered protein.The central premise underpinning this approach is the existence of a population of progenitor cells that are capable of regenerating different tissues with guidance from local cues in the wound environment. Mammalian cells are, of necessity, fully capable of forming the varied tissues and organs during initial development and growth of the organism. This regenerative ability is decreased with aging, in part the result of a decrease in production of the specific protein
GASP: Gapped Ancestral Sequence Prediction for proteins
Richard J Edwards, Denis C Shields
BMC Bioinformatics , 2004, DOI: 10.1186/1471-2105-5-123
Abstract: Here we present a new algorithm, GASP (Gapped Ancestral Sequence Prediction), for predicting ancestral sequences from phylogenetic trees and the corresponding multiple sequence alignments. Alignments may be of any size and contain gaps. GASP first assigns the positions of gaps in the phylogeny before using a likelihood-based approach centred on amino acid substitution matrices to assign ancestral amino acids. Important outgroup information is used by first working down from the tips of the tree to the root, using descendant data only to assign probabilities, and then working back up from the root to the tips using descendant and outgroup data to make predictions. GASP was tested on a number of simulated datasets based on real phylogenies. Prediction accuracy for ungapped data was similar to three alternative algorithms tested, with GASP performing better in some cases and worse in others. Adding simple insertions and deletions to the simulated data did not have a detrimental effect on GASP accuracy.GASP (Gapped Ancestral Sequence Prediction) will predict ancestral sequences from multiple protein alignments of any size. Although not as accurate in all cases as some of the more sophisticated maximum likelihood approaches, it can process a wide range of input phylogenies and will predict ancestral sequences for gapped and ungapped residues alike.Predicting ancestral protein sequences from a multiple sequence alignment is a useful tool in bioinformatics [1]. Many evolutionary sequence analyses require such predictions in order to map substitutions to a particular lineage (e.g. [2,3]). In other situations, the predicted ancestral sequence alone may provide a more representative functional sequence than a simple consensus sequence constructed from an alignment.Nevertheless, predicting ancestral sequences is not a simple procedure. It relies on a quality alignment plus an accurate – and correctly rooted – phylogenetic tree. Strict consensus methods are quick but can suffer
Mind-Body-Spirituality and Health Interations
Lonnie C. Edwards M.D.
Rose Croix Journal , 2004,
Abstract: Mind/body and spirituality in health and healing include a variety of approaches, treatments and findings. Harvard and Duke Universities, among others, have provided academic settings for encouraging and exciting forums for discussion of these topics. Presentations of research findings include such areas as body/mind and spirituality in healing, religious influences and their effect on immune and cardiovascular systems, the importance of thoughts, and other subjects dealing with health and well being. This research supports the use of many methodologies, including support groups, imaging, relaxation training and meditation. The Rosicrucian Order and its mystical teachings encompass the ideas and principles now being investigated.
A validation study of lawless expectancy model on low-level rural black workers
N. A. Edwards,J. C. D. Augustyn
South African Journal of Industrial Psychology , 1986, DOI: 10.4102/sajip.v12i1.455
Abstract: The object of this research is to validate the expectancy theory model propogated by Lawler(1971; 1973) on low level rural Black shop assistants in the Republic of Transkei. The criterion measure, performance, is measured by a performance appraisal instrument developed by the NIPR and the expectancy theory components by means of a translated version of the instrument which appears in the Michigan Organizational Assessment Package Part II. For a sample of 183 shop assistants from 10 organizations, the instrument yielded reliability coefficients ranging from 0,72 to 0,84. Evidence of validity was obtained by means of correlational analysis. A multiple correlation coefficient of R2 = 0,29 was obtained. Further evidence of validity was found by means of maximum likelihood path analytic procedures. Opsomming Die geldigheid van Lawler se verwagtingsteorie vir landelike Swart winkelassistente in die Republiekvan Transkei word in die studie ondersoek. Die komponente van die verwagtingsteorie is gemeet deur 'n vertaalde weergawe van die Michigan Organizational Assessment Package (Part II), terwyl die kriterium, werksprestasie, beoordeel is deur middel van 'n prestasiebeoordelingsvraelys ontwikkel deur die NIPN. Met 'n steekproef van 183 winkelassistente uit 10 organisasies het die motiveringsvraelys betroubaarheidskoeffisiente gelewer van tussen 0,72 en 0,84. Met uitsondering van die E→ P komponent was al die korrelasies met die kriterium beduidend op die l%-peil en het gevarieer tussen 0,24 en 0,26 met 'n gekwadreerde meervoudige korrelasiekoeffisient van 0,29. Genoeg positiewe bewyse is in die studie verkry om met redelike sekerheid te aanvaar dat die verwagtingsteorie van toepassing gemaak kan word op lae-vlak landelike Swart workers.
Flow and Self-Presentation in Runners Participating in 5 and 10 Kilometer Road Races
Amanda E. Edwards,Robert C. Eklund
Pamukkale Journal of Sport Sciences , 2011,
Abstract: The purpose of this investigation is to explore the relationship between flow state and self-presentation in runners. It was hypothesized that Self-presentation will be negatively and moderately correlated with the flow experience.A questionnaire packet containing an informed consent form, a demographic information handout, a Race Flow Scale (Modified DFS-2; Jackson & Eklund, 2002), and the Modified Self-Presentation in Sport Questionnaire (SPSQ; McGowan et al., 2008) was administered to 210 male and female runners. The analyses of this investigation are presented in two subsections: descriptive statistics and correlational analyses (including the results of a canonical correlation). It was found that individuals who experience self-presentational concerns are less likely to attain the state of flow. Implications and future research directions are discussed.
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