135,010 research outputs found
The participation of A. D. Kovalenko in the work of scientific forums in the field of mechanics (1942 - 1957)
No full textThe activity of the outstanding scientist-mechanic A. D. Kovalenko on organization of discussion of actual problems of mechanics at various scientifi c forums that took place in the period of 1942-1957 was investigated. The source of the research is determined. Documents from the personal archival fund of A. D. Kovalenko, deposited in the Institute of Archival Studies of VNLU, are analyzed. It is established that in 1942-1957 A. D. Kovalenko took part as a speaker in 56 scientifi c forums organized by the Academy of Sciences of the Ukrainian SSR, Kyiv Polytechnic Institute, T. Shevchenko State University of Kyiv, Dnipropetrovsk State University, Kharkiv Turbine Generator Plant, Southern Turbine Plant, personally by academician of the Academy of Sciences of the Ukrainian SSR A. M. Dynnyk, M. M. Afanasiev, A. D. Kovalenko himself and other Ukrainian scientists, as well as institutions of the Academy of Sciences of the USSR, P. I. Baranov Central Institute of Aviation Motors, the Central Scientific Research Institute of Technology and Machine Building, the Committee for the Strength of the All-Union Scientifi c Engineering and Technical Society of Machine Builders, the Moscow Aviation Technological Institute, the State Union Plant No. 165 and the Kirov Plant in Leningrad. It was proved that the participation of A. D. Kovalenko in the work of scientifi c forums contributed to the establishment of a scientific and information exchange of theoretical and practical achievements in the fi eld of tension and rigidity of gas turbine engines among scientists of the USSR, its access to the level of international scientifi c cooperation. The high information potential of documents of the personal archival fund of the scientist as a source of research of the history of organization and holding of domestic scientifi c forums in the fi eld of mechanics was noted
Analysis of existing approaches to setting the intelligent management systems of transport undertakings
No full textThe problem of designing intelligent management systems (IMS) of dynamically variable objects (DO), operating under significant a priori uncertainty is considered. The analysis of existing approaches to developing DO IMS, methods, models and algorithms of their construction based on the integration of classical methods of management theory and artificial intelligence methods was presented. As examples of DO, rolling stock (TU) of the multi-mode enterprises is examined. The range of unresolved problems is identified, the purpose and objectives for the solution are formulated. Currently, the problem of designing the automatic management systems of dynamically variable objects is characterized by the transition from the paradigm of adaptive management to the paradigm of intelligent management. This is caused by a continuous complication of management objects and conditions of their operation, the emergence of new classes of computing means (in particular, distributed computing systems), high-performance telecommunications channels, and a sharp increase in the reliability and efficiency requirements for management processes under significant a priori and a posteriori uncertainty. Accounting of these factors is possible only on the basis of transition from "hard" algorithms of parametric and structural adaptation to the anthropomorphic principle of management formation
MeSH term explosion and author rank improve expert recommendations
Get PDFInformation 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
Cooperation between FGF1 and a soluble form of the notch ligand, Jagged-1, is required for a cell transformation.
No full textJagged-1-dependent cell chord formation in vitro is modified by src and is resistant to the destabilization of actin stress fibers.
No full textGoing 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
Form factors for semileptonic, nonleptonic, and rare B(B_{s}) meson decays
Get PDFWe provide new values for the model parameters of the covariant constituent quark model (with built-in infrared confinement) in the meson sector by a fit to the leptonic decay constants and a number of electromagnetic decays. We then evaluate, in a parameter-free way, the form factors of the B(B-s) --> P(V) transitions in the full kinematical region of momentum transfer. As an application of our results, we calculate the widths of the nonleptonic B-s decays into Ds-Ds+, D-s*D--(s)+ + Ds-Ds*(+), and D-s*D--(s)*(+). These modes give the largest contribution to Delta Gamma for the B-s - (B) over bar (s) system. We also treat the nonleptonic decay B-s --> J/psi phi. Although this mode is color-suppressed, this decay has important implications for the search of possible CP-violating new-physics effects in B-s - (B) over bar (s) mixing
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
Get PDFBoth 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
Get PDFWe 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
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