131,239 research outputs found
Yu. Boiko-Blokhyn as the researcher of the creation of H. Skovoroda
No full textУ статті досліджується вплив творчості Г. Сковороди на погляди Ю. Бойка. Авторка стверджує, що Ю. Бойко вважав: спадщина філософа відображає ті проблеми, котрі цікавили українське суспільство XVIII ст., водночас твори Г. Сковороди ґрунтуються на народних звичаях, традиціях. У розвідці розглядається літературний доробок нашого письменника крізь призму зв’язків із європейською прогресивною думкою, зокрема з творчістю Ж.-Ж. Руссо. Також дослідниця приділяє значну увагу праці Д. Чижевського "Філософія Г. С. Сковороди" та її значенню для Ю. Бойка як дослідника спадщини українського мислителя XVIII ст.В статье исследуется влияние творчества Г. Сковороды на взгляды Ю. Бойко. Автор утверждает, что Ю. Бойко считал: наследие философа отображает те проблемы, которые интересовали украинское общество XVIII ст., одновременно произведения Г. Сковороды пронизаны народными обычаями, традициями. В статье рассматривается литературное наследие нашего писателя в сравнении с европейской прогрессивной мыслью, например с творчеством Ж.-Ж. Руссо. Также автор уделяет внимание труду Д. Чижевского "Философия Г. С. Сковороды" и её значению для Ю. Бойко как исследователя творчества украинского мыслителя XVIII ст.The article foсuses on the issue of the impact of H. Skovoroda's creative work on Yu. Boiko's views. The author argued that Yu. Boiko believed: philosopher heritage reflected the problems interested Ukrainian society of the XVIIIth century, while H. Skovoroda's works were based on folk customs and traditions. The article deals with the literary heritage of our writer through ties with European progressive thought, particularly with the works of J. J. Rousseau. The researcher also pays considerable attention to D. Chyzhevskyi's work "Philosophy of H. Skovoroda" and its importance for Yu. Boiko as heritage researcher of Ukrainian thinker of the XVIIIth century
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
Controlling a defect structure of the ZnGa2O4:Cr3+ spinel through synthesis parameters for persistent luminescence optimization
No full textZnGa2O4:Cr3+ (ZGO:Cr) is one of the most promising red persistent phosphors for in-vivo imaging due to its
650–750 nm emission band in the range of the so-called first biological window. In this paper, we report on how
to control the high brightness persistent luminescence of the smallest ZGO:Cr nanoparticles by optimization of
hydrothermal synthesis parameters. The influence of pH solution, the temperature of synthesis, and calcination
on the degree of inversion, lattice parameters, morphology, and crystallite size were systematically investigated.
The results have shown that different synthesis conditions modify the trap depths distribution, by mixing the
occupancy of Zn2+ and Ga3+ sites in the spinel structure, which affects the duration and intensity of persistent
luminescence. The correlation between structural changes and optical properties is established and it is possible
to control them by selecting the appropriate hydrothermal synthesis parameters
"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.
Effect of Ce3+ concentration on persistent luminescence of YAGG:Ce3+,Cr3+,Nd3+ nanophosphors obtained by the co-precipitation method
No full textSynthesis of Y3Al2Ga3O12 garnet (YAGG) nanophosphors co-doped with Ce3+, Cr3+, and Nd3+ ions by co-precipitation is reported. The effect of Ce3+ concentration on the structure of garnet and on optical properties including persistent luminescence was investigated. The X-ray diffraction measurements showed that single garnet phase was obtained. The contraction of the crystallites size was observed with increasing the cerium concentration. The combined emission of three used co-dopants together allows to extend persistent luminescence spectral range. The photoluminescence, excitation and persistent luminescence spectra were collected and the optimal Ce3+ concentration for the highest efficiency conversion of UV and blue light into the red and the near infrared emission was determined. Based on thermoluminescence data, the effect of Ce3+ concentration on the traps redistribution was also investigated
Luminescent YPO4:Eu@PVA dispersions for anti-counterfeiting ink applications
No full textA method was developed to obtain YPO4:Eu dispersions of PVA as a luminescent inks. YPO4:Eu nanoparticles were prepared by precipitation followed by hydrothermal treatment. The dispersion preparation included systematic studies to prepare a stable colloidal system and to investigate the role of parameters affecting its stability and UV-excited YPO4:Eu emission intensity. The effect of PVA concentration was studied in detail for two different PVAs to determine the optimal parameters for its use as ink with specific luminescent properties. The type of interactions responsible for the dispersion stability was also investigated
Multimodal anti-counterfeiting inks: modern use of an ancient pigment in synergy with a persistent phosphor
No full textMulti-level luminescent, transparent and non-permanent inks for anti-counterfeiting systems and security were developed. The inks emit radiation at different wavelengths based on the type of radiation used to illuminate them, providing multiple layers of safety. The red persistent phosphor Y2O2S:Eu3+,Mg2+,Ti4+ (YOS) was mixed with Egyptian Blue (EB) and dispersed in an aqueous solution of arabic gum. Imaging techniques, excitation and emission spectra, the study of luminescence over time and the duration time were used to verify that the obtained systems showed the desired optical characteristic both in the infrared and in the visible spectral ranges. The two luminescent materials act synergistically: when illuminated with UV light, YOS emits red photons over time and EB, absorbing this energy, emits infrared photons. The resulting emission characteristics are non-obvious and can be designed at the ink developing stage. The tests performed on several substrates showed that the developed luminescent inks are well suited for use in the field of security and anti-counterfeiting
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