886 research outputs found
Exotica in the Globular Cluster M4, Studied with Chandra, HST, and the VLA
No full textUsing the Hubble Ultraviolet Globular Cluster Survey (HUGS) and additional
HST archival data, we have carried out a search for optical counterparts to the
low-luminosity Chandra X-ray sources in the globular cluster M4 (NGC 6121). We
have also searched for optical or X-ray counterparts to radio sources detected
by the VLA. We find 24 new confident optical counterparts to Chandra sources
for a total of 40, including the 16 previously identified. Of the 24 new
identifications, 18 are stellar coronal X-ray sources (active binaries, ABs),
the majority located along the binary sequence in a V-I colour-magnitude
diagram and generally showing an H-alpha excess. In addition to confirming the
previously detected cataclysmic variable (CV, CX4), we identify one confident
new CV (CX76), and two candidates (CX81 and CX101). One MSP is known in M4
(CX12), and another strong candidate has been suggested (CX1); we identify some
possible MSP candidates among optical and radio sources, such as VLA20, which
appears to have a white dwarf counterpart. One X-ray source with a sub-subgiant
optical counterpart and a flat radio spectrum (CX8, VLA31) is particularly
mysterious. The radial distribution of X-ray sources suggests a relaxed
population of average mass ~ 1.2 - 1.5 Msun. Comparing the numbers of ABs,
MSPs, and CVs in M4 with other clusters indicates that AB numbers are
proportional to cluster mass (primordial population), MSPs to stellar encounter
rate (dynamically formed population), while CVs seem to be produced both
primordially and dynamically.Comment: 30 pages, 12 figures, 2 pages of supplementary material containing
finding chart
Author-level metrics: Its impact on scholarly output evaluation among various publication metrics
No full textPublication metrics indicate the visibility and reach of a research publication. The metrics can be at article-level, author-level, and journal-level to measure the scholarly output and its impact.1 Bibliometrics is the use of statistical methods to analyze various publications mostly used in the field of library and information science; whereas, scientometrics is the sub-field concerned with the science of metrics for the measurement and analysis of scholarly publications.2,3 Readers are not always well informed about the various publication metrics, and use them without knowing how to interpret them, their strength and limitations.4,5
The Internet has revolutionized the dissemination, visibility, and impact of documented evidence available on the Web. The author-level metrics (ALmetrics) provides a measure for the research output of an individual author.6 It summarizes and aggregates the impact of an author\u27s publications by using metrics like h-index (Hirsch-index7, calculated from the number of articles N by an author that have each received at least N citations), i10-index (measures the number of publications with at least 10 citations, Google Scholar), g-index (an improvement of h-index by giving more weight to highly-cited articles), e-index (differentiates between scientists with similar h-indices but different citation patterns) and others.8
The h-index (proposed by J.E. Hirsch in 2005) is a well-accepted metric to assess the scientific impact of an individual author and/or institution due to its simplicity for cumulative research output to indicate a number of papers (h) with at least h citations, e.g. h-index 9 means that among all publications by an author, 9 publications have at least 9 citations each.9,10 Various other new additions are proposed to complement the h-index to minimize its shortcomings in calculations of the index due to co-authors, self/collaborative citation, publication age, publication count, etc.11 The h-core is a contextualized evaluation considered more useful.12 Combination of newer variants help complement and eliminate some of the limitations of h-index, for example, R-index (to measure citation intensity of h-score) and AR-index (to include the age of publications).13 14 The w-index is another simple and useful improvement to the h-index to assess the integrated impact of a researcher\u27s work.15 The rh-index (robust h-index) adds value for the self- and collaborative citation.1
Efficacy and Safety in Clinical Trials in Cardiovascular Disease
No full textMortality and morbid events are insensitive guides to the efficacy and safety of interventions in chronic cardiovascular disease (CVD). To enhance the ability to find new and effective long-term treatments, especially for the early stages of CVD, a revised strategy for clinical trials should emphasize efficacy on disease progression while monitoring symptoms and quality of life as guides to clinical benefit. Mortality, which is uncommon except in acute or advanced disease, provides at best a crude guide to net efficacy and safety. It must be monitored to support demonstrated efficacy on disease progression without adverse safety effects. This revised approach, made possible by our enhanced ability to monitor the progression of disease, should make it possible to study earlier disease and to improve cardiovascular health while reducing health care costs
Robert Buchanan 1841-1901: an assessment of his career.
No full textPhDRobert Buchanan was widely regarded during his
lifetime as a poet of distinction, a capable and powerful
novelist, and a critic of some perception, yet his name is
now associated only with one regrettable episode, while
those of lesser men and women continue to be remembered for
work inferior to his. A man possessing large reserves of
energy, and pressed to write for a living at an early age,
he produced much work that deserves the oblivion it has
found; but his early verse, expressing his profound compassion
for the sufferings of the unfortunate in the simplest
language, some of his ballads, and not a little of his
later more vatic verse, is still worthy of study. As a
novelist his work is provocative and readable, but too
often descends to the level of the sentimental melodrama
which earned him, for a while, a very good income from the
stage. As a critic he was not profound, but was quick to
detect and praise expression of his own sympathy for humanity
that came to represent for him art's highest aspiration;
Dickens, Browning and Whitman were his heroes, and for the
last two he did sterling work in helping them to gain widespread
recognition. As a polemist he rushed into several
arenas, for some of which his talents were not especially
suited; but he publicly supported C. S. Parnell and Oscar
Wilde when few found the courage to do so. An interesting
man of impressive variety and undoubted talent has found an
undeserved neglect, and a full-scale critical biography of
Robert Buchanan is long overdue
'n Kritiese evaluering van die beraad van Jay E. Adams vanuit 'n Pinksterperspektief
No full textM.Th.The counseling' of Jay E Adams must be seen against the background of the rise of the Pastoral Care Movement and, together with it, the propagating of the eductive method of counseling which lays excessive emphasis on the needs of man and the inner potential of man to arrive at a solution of his own problems. Against a humanistic form of counseling, Adams stresses in particular the Scriptures as the counselor's textbook, and the role of sin in human suffering. His counseling has been judged and criticised in various circles, frequently without adequate substantiation or a satisfactory alternative. This dissertation is aimed at researching Adams' counseling thoroughly so that an alternative can be offered from a pentecostal perspective. First a comprehensive exposition was given of the core elements of Adams' counseling, that served as a foundation to discuss the positive and negative criticism of his work. The paradigms underpinning pentecostal thinking in general was also discussed, as the argument in this study was based on a pentecostal framework. Among other things the nature of man, the love and mercy of God, sin and the role of evil were examined. The author feels that no one specific model or technique of counseling can be promoted. Every person and every situation is unique. Therefore every counseling session will also be unique. For this reason it was decided to give guidelines rather than develop a model. Pentecostal counseling was approached from the perspective of systems-thinking and communicative action theory but was also directed by basic assumptions, among other things, that Jesus Christ is the centre of every counseling session (through the operation of the Holy Spirit) and that the congregation as a whole is the object of counseling. Finally the conclusion was reached that pentecostal counseling could definitely find common ground with the counseling of Jay E Adams, with certain adjustments based on pentecostal paradigms
'n Kritiese evaluering van die beraad van Jay E. Adams vanuit 'n Pinksterperspektief
No full textM.Th.The counseling' of Jay E Adams must be seen against the background of the rise of the Pastoral Care Movement and, together with it, the propagating of the eductive method of counseling which lays excessive emphasis on the needs of man and the inner potential of man to arrive at a solution of his own problems. Against a humanistic form of counseling, Adams stresses in particular the Scriptures as the counselor's textbook, and the role of sin in human suffering. His counseling has been judged and criticised in various circles, frequently without adequate substantiation or a satisfactory alternative. This dissertation is aimed at researching Adams' counseling thoroughly so that an alternative can be offered from a pentecostal perspective. First a comprehensive exposition was given of the core elements of Adams' counseling, that served as a foundation to discuss the positive and negative criticism of his work. The paradigms underpinning pentecostal thinking in general was also discussed, as the argument in this study was based on a pentecostal framework. Among other things the nature of man, the love and mercy of God, sin and the role of evil were examined. The author feels that no one specific model or technique of counseling can be promoted. Every person and every situation is unique. Therefore every counseling session will also be unique. For this reason it was decided to give guidelines rather than develop a model. Pentecostal counseling was approached from the perspective of systems-thinking and communicative action theory but was also directed by basic assumptions, among other things, that Jesus Christ is the centre of every counseling session (through the operation of the Holy Spirit) and that the congregation as a whole is the object of counseling. Finally the conclusion was reached that pentecostal counseling could definitely find common ground with the counseling of Jay E Adams, with certain adjustments based on pentecostal paradigms
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