1,721,244 research outputs found
Genetic diversity of jackfruit (Artocarpus heterophyllus Lam.) in Bangladesh and development of propagation methods
No full textThe present study set out to assess genetic diversity of jackfruit (Artocarpus heterophyllus Lam.) in Bangladesh, to selects its superior germplasm, and to develop suitable methods of vegetative and in-vitro propagation.The genetic diversity of jackfruit in Bangladesh was assessed by means of a farmers' participatory survey, a study of morpho-agronomic characteristics and an isozyme study in the laboratory.The superior types were selected on the basis of farmers' preferences. Ten superior types were recommended on the basis of yield per plant, fruiting season, flesh colour, flesh texture and sweetness. Cultivation of superior types may increase the production of quality jackfruit and would also extend the fruiting season in Bangladesh.An attempt was made to develop propagation methods. Air-layering gave 86% rooting success when it was done in the month of November on current year shoots in mature trees of jackfruit. The subsequent growth of the layers in the nursery was found to be good after one years of establishment. The success rate in the nursery after one year was 80%.The methods of grafting in respect of different seasons were standardised using scions from mature trees. Among the methods, veneer grafting in April gave the highest (80%) success. The seasons of grafting could be extended to October with epicotyl grafting and to November by cleft or splice grafting. The subsequent growth and establishment of these grafts were also found satisfactory.In the study of in-vitro methods, 2.0 mg/1 of BAP or 0.5 mg/1 of TDZ were the effective cytokinins for multiple shoot regeneration. GA3 or Kinetin did not produce multiple shoots on a large scale. The regenerated shoots were rooted using IBA at concentrations of 2.0 to 2.5 mg/1 in in vitro culture. The in-vitro plantlets were established in the nursery. The success rate of establishment was 81-88%. The protocol for hardening and establishment of in-vitro derived plantlets in the nursery was developed for a higher success rate.</p
Cyber-physical laboratories in engineering and science education
Get PDFThis volume investigates a number of issues needed to develop a modular, effective, versatile, cost effective, pedagogically-embedded, user-friendly, and sustainable online laboratory system that can deliver its true potential in the national and global arenas. This allows individual researchers to develop their own modular systems with a level of creativity and innovation while at the same time ensuring continuing growth by separating the responsibility for creating online laboratories from the responsibility for overseeing the students who use them. The volume first introduces the reader to several system architectures that have proven successful in many online laboratory settings. The following chapters then describe real-life experiences in the area of online laboratories from both technological and educational points of view. The volume further collects experiences and evidence on the effective use of online labs in the context of a diversity of pedagogical issues. It also illustrates successful online laboratories to highlight best practices as case studies and describes the technological design strategies, implementation details, and classroom activities as well as learning from these developments. Finally the volume describes the creation and deployment of commercial products, tools and services for online laboratory development. It also provides an idea about the developments that are on the horizon to support this area
What Every Engineer Should Know about Engineering Education
Get PDFThe purpose of this paper is to present the current status of the literature of engineering education. In order to accomplish this task several questions are discussed: Who publishes the documents? What are the topics of the articles published? How to find them? and Where to publish them? The author also discusses the deficiencies found in existing databases caused by the lack indexing of a great deal of information of significant importance and proposes the development of an engineering education gateway to overcome this problem
Anti-Tuberculosis Drug Discovery by Bioluminescence-Based Screening of a Protein Kinase Inhibitor Library
Get PDFA library of 3000 putative kinase inhibitors from the ChemBridge Corporation was first screened by bioluminescence assay against Mycobacterium smegmatis, a non-virulent model organism for Mycobacterium tuberculosis (M.tb), to identify compounds which could successfully inhibit the growth of M.tb. After screening against a M. smegmatis reporter strain expressing luciferase, we found nine compounds which significantly inhibited its growth, as indicated by lower relative luminescence units (RLUs) over time. These nine compounds were tested in a similar fashion for their effects on M.tb growth in both in-vitro broth culture and inside human macrophages. From this bio-screening analysis, two compounds, 14/C5 and 17/G7, were identified as having the most effect on M.tb growth and considered as promising anti-tuberculosis (anti-TB) drugs for further analysis.2012-2013 Arts and Sciences Research ScholarshipOSU Public Health Preparedness for Infectious Diseases ProgramHarrington-Scholar Innovator AwardNo embargoAcademic Major: Microbiolog
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Advances in clean energy technologies
No full textAzad, M ORCiD: 0000-0001-8258-6057Advances in Clean Energy Technologies presents the latest advanced approaches toward a cleaner and more sustainable energy environment. Editor Kalam Azad and his team of expert contributors focus on recent developments in the field of clean energy technologies, sustainable zero emission resources, energy efficiency and environmental sustainability, as well as clean energy policy and markets. This well-rounded reference includes an authoritative view on control and storage solutions specific to medium and large-scale industries, advanced approaches to modeling, and experimental investigations on clean energy technologies.
Those working in and researching clean energy and sustainability will obtain detailed understanding of a variety of zero emission energy production and conversion approaches, as well as important socio-economic and environmental considerations that can be applied to their own unique power generation settings.
Key Features
Presents an exclusive analysis on advanced approaches of modeling and experimental investigations of clean energy technologies, including solar, wind, ocean, and hybrid systems
Includes an authoritative and cross-disciplinary view on energy policy and energy markets
Helps readers develop an understanding of concepts and solutions to global issues surrounding sustainability in medium-large scale energy industries
Offers detailed understanding of a variety of zero emission energy production and conversion approache
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Grid-Integration of Wind Energy Systems: Control Design, Stability and Power Quality Issues
No full textthis chapter presents a comprehensive coverage on the modeling and control design of variable speed wind energy conversion systems. Different wind turbine, generator configurations and converter topologies are presented. The stability and power quality issues are also studied. In the simulation studies presented a squirrel-cage induction generator (SCIG)-based wind energy conversion system (WECS) is considered. The first control scheme considered in this chapter is based on vector control theory. Indirect field oriented control (IFOC) scheme with proportional and integral (PI) are designed for SCIG speed control. A simple maximum power point tracking (MPPT) strategy is used to determine the optimal speed under variable wind speed conditions which is then used as the reference in the IFOC scheme. Power flow between the supply and the inverter is regulated via simultaneous control of the active and reactive currents of the grid and the DC link voltage. The second control approach discussed in this chapter is based on direct torque control (DTC) theory which has been successfully used to a variety of high performance industrial AC drives. The DTC space vector modulation (DTC-SVM) is designed and applied to two and three level voltage source inverter (VSI) to improve the energy efficiency of the variable speed SCIG-based WECS. Three different topologies are proposed to control the torque and flux of the SCIG. A series of simulations are presented to demonstrate the performance of these proposed control schemes under a variety of operating conditions including symmetrical and asymmetrical faults. Electric power quality issues are also analysed and discussed in terms of harmonics and compared with respect to different converter topologies and control strategies
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