131,040 research outputs found
Investigation of the Effects of CNC Tool Runout on Machining of 1.2379 Steel and Tool Life
No full textIn the study, the effects of tool run-out caused by the CNC spindle mechanism on surface roughness, measurement accuracy, consumable expenses, maintenance costs and cutting tool life that may occur during the cutting process wer e investigated based on metal die manufacturing. Before starting the experimental studies, the machine spindle health was measured. Here, tool pulling force, 300 mm test bar run-out, inner conical run-out and spindle vibration values were examined and evaluated. According to the results obtained, the m3/life relationship was compared with the surfa ce milling operation by eliminating the factors causing tool run-out before and after machine tool maintenance for cut ting tool life. In order to examine the effect of run-out on surface roughness and measurement accuracy, the effect of run-out was examined and compared by applying outer contour and inner contour operations before and after mainte nance with experimental studies. These operations were examined with 1.2379 steel, which is the most commonly use d steel type in the metal die sector in terms of mechanical properties. The results showed that run-out has serious ne gative effects on the cutting process and cutting tool life, measurement accuracy and surface roughness. In operations performed with a healthy spindle after maintenance, the cutting tool life increased by an average of 40%, surface rou ghness and dimensional accuracy reached the desired levels. The stress during the machine operation decreased by an average of 15%. © 2024, Hamit Solmaz. All rights reserved.(ARGE-2022-28 2201100000
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
Complexes of PEO-PPO-PEO triblock copolymer P123 and bile salt sodium glycodeoxycholate in aqueous solution: A small angle X-ray and neutron scattering investigation
No full textSmall angle X-ray (SAXS) and neutron scattering techniques were combined to study mixed complexesformed between micelles of the nonionic amphiphilic PEO-PPO-PEO copolymer (P123) and the anionicbile salt (NaGDC) in aqueous solution. The purpose was to investigate the structural parameters of thecharged complexes, such as size and internal structure, as well as their interparticle interactions inaqueous solution. The overall aim of this work was to gain understanding of how thermoresponsivePEO-PPO-PEO block copolymers interact with bile salts in order to make predictions as to whether theycan be put forward as a new class of bile salt sequestrants in the treatment of bile-salt related diseases.The system was investigated at a constant P123 concentration of 1.74 mM and bile salt concentrationswere varied up to a molar ratio nNaGDC/nP123(MR) = 5.7. It was found that the NaGDC molecules prefer-entially associated to the PEO corona of the P123 micelle and due to their amphiphilic nature, close tothe core/corona interface. Because of this association the micelles became charged causing their recip-rocal interparticle repulsions in solution to increase. In parallel, the association caused a decrease inthe core radius accompanied by dehydration, which in turn led to a decrease in total radius of the“P123 micelle-NaGDC” complexes. To elucidate the effect of the interactions on their diffusive motion, aninteraction model based on a spherical particle with a hard-core interaction shell was employed using the fitted SAXS data. At higher molar ratios, the interparticle interaction was increasingly screened becauseof nonadsorbed bile salt in the surrounding solution. Meanwhile, a further decrease in total radial sizeof the P123 micelle-NaGDC complexes occurred due to a decrease in the aggregation number of P123as the bile salt finally disintegrated the complexes. However, the micelles were found to be more stableand less prone to disintegration in D2O. This investigation demonstrated the importance of using smallangle scattering techniques for studying intermolecular interactions in order to gain understanding ofhow natural surfactants influence the aggregation behavior of amphiphilic polymers
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
D-Ped Assignment Involving Solmaz Sharif\u27s Look and the influence of digital platforms on contemporary poetry
No full textStudents were asked to consider the effectiveness of using erasure and language from the Military Dictionary in the writing of Solmaz Sharif\u27s Look. They were then tasked with doing research as to which poems were published digitally from that collection. Finally, they were to compare her poems to the work of the newly famous instapoets as to the effects of the different digital platforms on the art form
"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.
Effects of bile salt Sodium glycodeoxycholate on the self-assembly of PEO-PPO-PEO triblock copolymer P123 in aqueous solution
No full textA comprehensive experimental study on the interaction between the PEO-PPO-PEO block copolymer P123 (EO20PO68EO20) and the anionic bile salt sodium glycodeoxycholate (NaGDC) in water has been performed. The work was aimed at investigating the suitability of using P123 as bile salt sequestrant beside the fundamental aspects of PEO-PPO-PEO block copolymer-bile salt interactions. Various experimental techniques including dynamic and static light scattering, small-angle X-ray scattering, and differential scanning calorimetry (DSC) were employed in combination with electrophoretic mobility measurements. The system was investigated at a constant P123 concentration of 1.74 mM and with varying bile salt concentrations up to approximately 250 mM NaGDC (or a molar ratio n(NaGDC)/n(P123) = 144). In the mixed P123-NaGDC solutions, the endothermic process related to the self-assembly of P123 was observed to gradually decrease in enthalpy and shift to higher temperatures upon progressive addition of NaGDC. To explain this effect, the formation of NaGDC micelles carrying partly dehydrated P123 unimers was proposed and translated into a stoichiometric model, which was able to fit the experimental DSC data. In the mixtures at low molar ratios, NaGDC monomers associated with the P123 micelle forming a charged "P123 micelle-NaGDC" complex with a dehydrated PPO core. These complexes disintegrated upon increasing NaGDC concentration to form small "NaGDC-P123" complexes visualized as bile salt micelles including one or a few P123 copolymer chains
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
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