252,111 research outputs found
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
Demography of obscured and unobscured AGN: prospects for a Wide Field X-ray Telescope
No full textWe discuss some of the main open issues in the evolution of Active Galactic Nuclei which can be solved by the sensitive, wide area surveys to be performed by the proposed Wide Field X-ray Telescope mission
Discovering statistics using R / Andy Field, Jeremy Miles, Zoë Field.
No full texteconomic&political bookfair2016Includes bibliographical references (p. 941-947) and index.xxxiv, 957 p. :The R version of Andy Field's hugely popular Discovering Statistics Using SPSS takes students on a journey of statistical discovery using the freeware R. Like its sister textbook, Discovering Statistics Using R is written in an irreverent style and follows the same ground-breaking structure and pedagogical approach. The core material is enhanced by a cast of characters to help the reader on their way, hundreds of examples, self-assessment tests to consolidate knowledge, and additional website material for those wanting to learn more
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Letter from John P. John to Joseph R. Goodman, 1942
No full textLetter from John P. John to Joseph R. Goodman: "Here are a couple of letters Caleb received concerning the Japanese situation. I have already sent him a condensed record of their general text. Probably more material will be coming in from time to time and we will forward it to you. I guess this is sufficient since Caleb has spoken with you in detail about the problem and where he is to be contacted in the east. Louise Thompson and I are holding things down while Caleb is away and can be contacted here by mail for anything."Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
Scientific and Business Cooperation in the Field of R&D: Researchers - Leaders Survey, May - July, 2017
No full textThe purpose of the study: to find out the opinion of researchers - managers about the obstacles to cooperation between science and business in the field of research and development and the factors that promote it.
Major investigated questions: respondents were asked if they had held a management position in the last 5 years. Respondents were asked about their responsibilities and their experience of working with commercial enterprises in R&D. It was stated that in the last 5 years there were several projects with a unit or team of researchers. They were asked when they last participated in a joint R&D project (purchasing or selling R&D services) with commercial enterprises. They were asked if they would like to undertake joint projects and what the reasons were. Those who have not conducted joint R&D projects were asked to indicate the reasons why they have not conducted them with business enterprises so far, and those who do not want to do so - why they do not want to participate in joint projects. They were asked what would encourage them to carry out joint R&D projects with commercial enterprises. Staff were asked why they participate in joint R&D projects with commercial enterprises and the means by which they are carried out. After listing the intermediaries, they were asked to indicate which of them are involved in joint R&D projects with business enterprises. Respondents were asked to answer the general obstacles to carrying out projects with companies and to indicate whether or not the managed unit (research team) had carried out publicly funded R&D projects with companies during the period 2007-2013. It was asked about the main administrative obstacles to the smooth running of publicly funded R&D activities. Furthermore, it was clarified whether the respondents are satisfied with the results of R&D projects with companies so far and how they assess the relationship between the efforts made so far in R&D projects with companies and the benefits. Respondents were asked whether they intend to carry out R&D projects jointly with companies in the future and to what extent they are likely to carry out joint R&D projects with former and / or existing partners (companies) in the future.
Socio-demographic characteristics: age, gender, which department is headed, how long is the head of the department, number of subordinates, time spent on activities, main field of science in which R&D is conducted, work in business after graduation, county, institution, type of leadership.
This survey was conducted at the initiative of the Research and Higher Education Monitoring and Analysis Centre (MOSTA). On January 1, 2019, MOSTA was reorganized into the Government Strategic Analysis Center (STRATA)
Electromagnetic scattering from random media / Timothy R. Field.
No full textengineering bookfair2015Includes bibliographical references (p. 174-180) and index.xiii, 184 p. :The book develops the dynamical theory of scattering from random media from first principles. Its key findings are to characterize the time evolution of the scattered field in terms of stochastic differential equations, and to illustrate this framework in simulation and experimental data analysis
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Scan and paint: theory and practice of a sound field visualization method
No full textSound visualization techniques have played a key role in the development of acoustics throughout history. The development of measurement apparatus and techniques for displaying sound and vibration phenomena has provided excellent tools for building understanding about specific problems. Traditional methods, such as step-by-step measurements or simultaneous multichannel systems, have a strong tradeoff between time requirements, flexibility, and cost. However, if the sound field can be assumed time stationary, scanning methods allow us to assess variations across space with a single transducer, as long as the position of the sensor is known. The proposed technique, Scan and Paint, is based on the acquisition of sound pressure and particle velocity by manually moving a P-U probe (pressure-particle velocity sensors) across a sound field whilst filming the event with a camera. The sensor position is extracted by applying automatic color tracking to each frame of the recorded video. It is then possible to visualize sound variations across the space in terms of sound pressure, particle velocity, or acoustic intensity. In this paper, not only the theoretical foundations of the method, but also its practical applications are explored such as scanning transfer path analysis, source radiation characterization, operational deflection shapes, virtual phased arrays, material characterization, and acoustic intensity vector field mapping
Combined effect of electric field and surface modification on pool boiling of R-123
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.The effect of surface modification and high intensity electric field (uniform and non – uniform) acting separately or in combination on pool boiling of R-123 is presented in this thesis. The effect of surface modification was investigated on saturated pool boiling of R-123 for five horizontal copper surfaces modified by different treatments, namely: an emery polished surface, a fine sandblasted surface, a rough sandblasted surface, an electron beam (EB) enhanced surface and a sintered surface. Each 40 mm diameter heating surface formed the upper face of an oxygen-free copper block, electrically heated by embedded cartridge heaters. The experiments were performed from the convective heat transfer regime to the critical heat flux, with both increasing and decreasing heat flux, at 1.01 bar, and additionally at 2 bar and 4 bar for the emery polished surface. Significant enhancement of heat transfer with increasing surface modification was demonstrated, particularly for the EB enhanced and sintered surfaces. The emery polished and sandblasted surface results are compared with nucleate boiling correlations and other published data. The effect of uniform and non-uniform electric fields on saturated pool boiling of R-123 at 1.01 bar pressure was also examined. This method of heat transfer enhancement is known as electrohydrodynamic abbreviated as EHD-enhancement. A high voltage potential was applied at the electrode located above the heating surface, which was earthed. The voltage was varied from 0 to 30 kV. The uniform electric field was provided through a 40 mm diameter circular electrode of stainless steel 304 wire mesh having an aperture of 5.1 mm, while the non-uniform electric field was obtained by using a 40 mm diameter circular rod electrode with rods 5 and 8 mm apart. The effect of uniform electric field was investigated using all five modified surfaces, i.e. emery polished, fine sandblasted, rough sandblasted, EB enhanced and sintered surfaces, while non – uniform electric field was tested using the emery polished, fine sandblasted, EB enhanced and sintered surfaces. The effect of pressure on EHD enhancement was also examined using emery polished surface at saturation pressure of 2 and 4 bars while the electric field was fix at 20 kV corresponding to 2 MV/m. Further, the bubble dynamics is presented for the emery polished surface obtained using a high-speed high – resolution camera.The Government of Pakista
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