130,602 research outputs found
Unconventional Pressure-Induced Magnetic Transitions in Non-Magnetic Lafesi
No full textThis work demonstrates that two consecutive magnetic transitions occur in non-magnetic LaFeSi compound under negative hydrostatic pressure (smaller volume expansion). Electronic structure and mechanical properties of LaFeSi were calculated using density functional theory (DFT) to understand the origin of these magnetic transitions. The antiferromagnetic transition at -7.52 GPa is consistent with the experimentally observed antiferromagnetic ground states in CeCeSi, and LaMnSi compounds having similar crystal geometry. Mechanical properties of LaFeSi, in particular, elastic properties (shear and Young’s modulus, and Poisson’s ratio), were determined by DFT distortion calculations to elucidate anisotropic behavior. This observation of unexpected magnetic ordering predicts that layered non-magnetic materials, like LaFeSi, may become magnetically active with lattice expansion.This preprint is available as Chouhan, Rajiv Kumar and Johnson, Duane D. and Mudryk, Yaroslav, Unconventional Pressure-Induced Magnetic Transitions in Non-Magnetic Lafesi.
doi: http://dx.doi.org/10.2139/ssrn.4768281. Published as Chouhan, Rajiv Kumar, Duane D. Johnson, and Yaroslav Mudryk. "Unconventional Pressure-Induced Magnetic Transitions in Non-Magnetic Lafesi."
doi: https://doi.org/10.1016/j.jmmm.2024.172356
Evolution and Current Status of Arthroscopic Surgery in India
No full textABSTRACT
Arthroscopic surgeries are worldwide accepted modality to surgically treat the intraarticular injuries and ailment. The introduction and evolution of the same in our country was little late; however, an exponential improvement was observed in last one decade. Specialized workshops, conferences, and courses are the main sources for the learning and upgradation of surgical skills in this field.
How to cite this article
Rajan D, Dhillon MS, Cheema U, Chouhan DK. Evolution and Current Status of Arthroscopic Surgery in India. J Postgrad Med Edu Res 2018;52(1):22-25.
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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
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
"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.
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
Scholarly Communication and Publishing Lunch and Learn Talk #11: The ULS Open Access Author Fee Fund
No full textAt the May 2014 talk, you will learn about the ULS Open Access Author Fee Fund--what it is, why we do it, how it works, and how the program is going so far
Long-Term Revision Rate due to Infection in Hydrophilic-Coated Inflatable Penile Prostheses: 11-Year Follow-up
No full textIntroduction. Penile implant surgery continues to be an important option for men with erectile dysfunction. Advancements in technology of implants have contributed to improved survival from mechanical breakdown. Prosthesis infection remains a serious adverse event. For the last 8 years, the Titan implant (Coloplast Corporation, Minneapolis, MN, USA) has been available with an infection-retardant polyvinylpyrrolidone coating. Aim. To compare the infection rates between coated three-piece inflatable penile prostheses (IPPs) with the previous non-coated model. Main Outcome Measures. Infection-related revisions reported in the physician-generated, manufacturer-tabulated patient information forms (PIFs). Methods. PIFs reported into the voluntary, post-market registry of Coloplast Corporation from July 14, 2000 to September 30, 2011 were retrospectively reviewed. Infection-related revisions entered into the product evaluation database for coated and non-coated IPPs were compared. Data were analyzed using Pearson's chi-squared test. Results. The database included 36,391 PIFs related to primary IPP implantation. At 11 years of follow-up, 4.6% (7,031) of non-coated IPPs were removed or replaced due to infections, whereas 1.4% (29,360) of hydrophilic-coated implants reported replacements due to device infections. The hydrophilic coating of the IPP components makes the device slippery and prevents bacterial attachment. The hydrophilic coating allows rapid absorption of antibiotics in an aqueous solution and allows these water-soluble antibiotics to elute off the device into the implant spaces. Unfortunately, information pertaining to what agents were used in the studies patients was not tabulated. The rate of revision due to device infection was reduced 69.56% in patients with hydrophilic-coated IPPs (P < 0.001). Conclusion. To the best of our knowledge, this is the longest post-marketing registry report related to IPP infections. At 8 years of follow-up, the hydrophilic-coated IPPs demonstrated a significant reduction in revision rates due to infection when compared with the 11-year follow-up of non-coated implants. Since there was no information or uniformity of antibiotics used in the soaking solution, it is uncertain which antibiotic selection provided the best results. In vitro testing against known infectious agents may further benefit IPP patients by reducing the prosthesis infection rate. Serefoglu EC, Mandava SH, Gokce A, Chouhan JD, Wilson SK, and Hellstrom WJG. Long-term revision rate due to infection in hydrophilic-coated inflatable penile prostheses: 11-year follow-up. J Sex Med 2012;9:21822186
The R&D Tax Incentives
No full textThis article sets out some background information and reflections of the author on the R&D tax incentive schemes included in the Common Corporate Tax Base (CCTB) Proposal. In particular the author analyzes the stimulus to private R&D through ad hoc tax incentives included in the CCTB Proposal and dives into the actual provisions included in the Proposal highlighting the most relevant issues connected with their design and interpretation. Moreover, the author explores the interaction between the CCTB Proposal and the granting by Member States of domestic R&D tax incentives
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