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Energy efficient innovative lighting and energy supply solutions in developing countries
No full textThe vast majority of the rural population in the de veloping countries is out of reach of electricity and hence has to depend on the tradi tional fuels to fulfil the daily energy needs. Providing grid electricity to the rural areas of ma ny developing countries is a very difficult task due to the geographical complexity and lack of fina ncial resources. The paper explains the use of different renewable energy sources in combination w ith efficient lighting technology as a realistic option to provide clean lighting services to develo ping countries. The application of Light Emitting Diodes and renewable energy sources has be en a sustainable solution to the basic lighting needs of rural people. The paper also pres ents a comparison of costs between available renewable energy technologies
Drilling Performance Investigations on Hybrid Composites by Using D-Optimal Design
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Home > Vol 8, No 5 (2014) > Vinayagamoorthy
Open Access Open Access Restricted Access Subscription or Fee Access
Drilling Performance Investigations on Hybrid Composites by Using D-Optimal Design
R. Vinayagamoorthy(1*), N. Rajeswari(2), S. Vijayshankar(3), K. Balasubramanian(4)
(*) Corresponding author
Authors' affiliations
DOI: https://doi.org/10.15866/ireme.v8i5.3707
Abstract
The present study is carried out to study the damage observed at entrance and exit of the hole during drilling and surface quality of drilled hole on newly developed natural hybrid composites. Hybrid composite samples are prepared by using vinyl ester resin and three types of reinforcements namely, randomly oriented vetiveria zizanioides, woven jute and woven glass. The natural fibers are pre-treated with alkali and furnace heating in order to improve its surface properties. Three samples are developed by varying the composition of fibers in each one. Machinability study is done by drilling a series of 28 holes based on D-optimal design. Three output responses namely, damage factor at entrance and at exit and surface roughness are measured and optimized with an objective of minimizing the damages. Confirmatory runs are conducted and the responses are measured. The results are validated by calculating the average percentage of error between the model and confirmatory runs. The error was found to be minimal and hence the optimization is highly satisfactory
sjworthy/Port.Traits: Release of code
No full textRelease of code association with the publication: Variation in plant traits and phylogenetic structure associated with native and nonnative species in an industrialized flora. Authors: Samantha J. Worthy, Travis D. Marsico, Rima D. Lucardi, Lauren E. Whitehurst, Kevin S. Burges
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
A review of the genus Insigniocastnia J.Y. Miller, 2007 (Lepidoptera: Castniidae) with notes on Castnia amalthaea H. Druce, 1890
No full textWorthy, Robert, González, Jorge M., Ríos, Sergio D. (2019): A review of the genus Insigniocastnia J.Y. Miller, 2007 (Lepidoptera: Castniidae) with notes on Castnia amalthaea H. Druce, 1890. Zootaxa 4550 (2): 277-288, DOI: 10.11646/zootaxa.4550.2.
The effects of teachers' questioning patterns on learners' outcomes.
No full textThe purpose of this study was to determine the effects of middle school social studies teachers' questioning patterns on learners' outcomes. Using a strategy developed by Beck, McKeown, Sandora, Kucan, & Worthy (1996), Questioning the Author, participants were trained in the implementation of this effective questioning strategy in an effort to improve classroom questioning and students' responses to text.Two volunteer social studies teachers from an inner city middle school in western Pennsylvania were the participants in the study. The investigator served as the primary observer using a case study format.The primary instrument used to gather data was observations. The investigator observed and audio taped each lesson. Once the lessons were audio taped, the observations were transcribed and categorized using an observation tool based on the work of Beck, McKeown, Sandora, Kucan, & Worthy (1996).Four social studies texts were used and each was taught by the participants during a separate 45-minute class period. Together the investigator and the participants pre selected these texts based on curriculum criteria. Once the chosen texts were taught to the students, the investigator trained the subjects in the implementation of Questioning the Author (Beck, I. L., McKeown, M. G., Hamilton, R. L., & Kucan, L., 1997; Beck, McKeown, Sandora, Kucan, & Worthy, 1996) strategies. The investigator then observed the subjects teaching the same four texts. The data obtained from the audio tapes and observations were analyzed using tables and descriptive narratives. In addition, participants kept reflective teaching journals, which were also categorized and analyzed. Additional instruments used to gather data included the Survey: Teaching Questioning Survey and interviews with participants. The survey was distributed prior to the study and sought after information about the participants' general knowledge of questioning strategies. Interviews were conducted before and during the study with information obtained woven into the analysis and conclusions.The study concluded that the intervention staff development strategy, Questioning the Author (Beck, I. L., McKeown, M. G., Hamilton, R. L., & Kucan, L., 1997; Beck, McKeown, Sandora, Kucan, & Worthy, 1996) resulted in an increased ability of teachers to ask questions that prompted higher student engagement with text. Similarly, the increase in text engagement resulted in elevated levels of comprehension
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Preservice Teachers' Development of Effective Approaches to Text-based Discussion
No full textText-based discussion is a dialogic instructional practice to promote reading comprehension among students. To enact this practice, a teacher engages students in authentic conversation about text as students read it, to assist them in building understanding of text ideas as they are encountered. Text-based discussion has the potential to promote the development of both low-level and high-level comprehension skills among students, yet teachers need support in learning to enact it. Research has indicated that text-based discussion is not well-represented in classrooms today, likely because not many teachers have access to this support.
Recently, some teacher educators have focused on teaching preservice teachers (PSTs) to enact text-based discussions during teacher preparation programs, in an attempt to increase the presence of the practice in classrooms. Practice-based methods courses have been developed which attempt to provide preservice teachers with the knowledge and skill needed to enact text-based discussions successfully. This study investigated the ways in which six preservice teachers’ enactments of text-based discussion developed over the course of their one-year student teaching placements, after completing one such methods course in which they learned to enact the practice.
Data were collected at three time points during student teaching, and included transcripts of enactments of text-based discussion, lesson plans, interview transcripts, and assessments of lesson quality using the Instructional Quality Instrument (Junker et al., 2004). Analysis of the data suggested that the PSTs entered student teaching with the ability to enact text-based discussions with a moderate level of success, and that the quality of the discussions continued to improve over the course of the school year. The methods course seemed to support PSTs in learning to link student comments and press students for accuracy and reasoning. PSTs were more successful in eliciting student linking and recall of explicit text information than in eliciting elaborated responses from students; the participation structure enforced by the PST seemed to influence the extent to which students provided elaborated responses. This study supports the use of practice-based methods courses to teach PSTs to enact text-based discussions, and uncovers several areas that are in need of additional focus during these courses
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Worthy Heir
No full textBlack and white photo of bay gelding Worthy Heir, D. Stokes up in the 2.17 Class Trot of the July 15, 1932 Mohawk Circuit races at the Topsfield Fair, Topsfield, Massachusetts. The judges\u27 stand can be seen in the background.https://digitalcommons.library.umaine.edu/kendall_images/1690/thumbnail.jp
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