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Search Results: 1 - 10 of 195 matches for " Melvyn; "
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Melbourne-RACI December Synthesis Symposium
Melvyn Gill
Molecules , 2004, DOI: 10.3390/90600383
Abstract: No abstract available
Kojo Touvalou Houénou: An Assessment
Melvyn Stokes
Transatlantica : Revue d'études Américaines , 2009,
Abstract: Six years ago, one of my graduate students showed me a short article from the New York Times, in August 1923, reporting that D. W. Griffith’s highly racist film The Birth of a Nation had been banned in Paris on the direct orders of Prime Minister Raymond Poincaré. I was then working on a book about Birth of a Nation, and put the story of the French suppression of the film aside as a separate project for later investigation. When I did finally get around to researching the ban in French archiv...
Adaptive Real Time Imaging Synthesis Telescopes
Melvyn Wright
Physics , 2012,
Abstract: The digital revolution is transforming astronomy from a data-starved to a data-submerged science. Instruments such as the Atacama Large Millimeter Array (ALMA), the Large Synoptic Survey Telescope (LSST), and the Square Kilometer Array (SKA) will measure their accumulated data in petabytes. The capacity to produce enormous volumes of data must be matched with the computing power to process that data and produce meaningful results. In addition to handling huge data rates, we need adaptive calibration and beamforming to handle atmospheric fluctuations and radio frequency interference, and to provide a user environment which makes the full power of large telescope arrays accessible to both expert and non-expert users. Delayed calibration and analysis limit the science which can be done. To make the best use of both telescope and human resources we must reduce the burden of data reduction. Our instrumentation comprises of a flexible correlator, beam former and imager with digital signal processing closely coupled with a computing cluster. This instrumentation will be highly accessible to scientists, engineers, and students for research and development of real-time processing algorithms, and will tap into the pool of talented and innovative students and visiting scientists from engineering, computing, and astronomy backgrounds. Adaptive real-time imaging will transform radio astronomy by providing real-time feedback to observers. Calibration of the data is made in close to real time using a model of the sky brightness distribution. The derived calibration parameters are fed back into the imagers and beam formers. The regions imaged are used to update and improve the a-priori model, which becomes the final calibrated image by the time the observations are complete.
Representation functions of additive bases for abelian semigroups
Melvyn B. Nathanson
International Journal of Mathematics and Mathematical Sciences , 2004, DOI: 10.1155/s0161171204306046
Abstract: A subset of an abelian semigroup is called an asymptotic basis for the semigroup if every element of the semigroup with at most finitely many exceptions can be represented as the sum of two distinct elements of the basis. The representation function of the basis counts the number of representations of an element of the semigroup as the sum of two distinct elements of the basis. Suppose there is given function from the semigroup into the set of nonnegative integers together with infinity such that this function has only finitely many zeros. It is proved that for a large class of countably infinite abelian semigroups, there exists a basis whose representation function is exactly equal to the given function for every element in the semigroup.
Does undertaking an intercalated BSc influence first clinical year exam results at a London medical school?
Mary Howman, Melvyn Jones
BMC Medical Education , 2011, DOI: 10.1186/1472-6920-11-6
Abstract: A multivariable analysis was performed to compare the third year results of students at one London medical school who had or had not completed their iBSc by the start of this year (n = 276). A general linear model was applied to adjust for differences between the two groups in terms of potential confounders (age, sex, nationality and baseline performance).The results of third year summative exams for 276 students were analysed (184 students with an iBSc and 92 without). Unadjusted analysis showed students who took an iBSc before their third year achieved significantly higher end of year marks than those who did not with a mean score difference of 4.4 (0.9 to 7.9 95% CI, p = 0.01). (overall mean score 238.4 "completed iBSc" students versus 234.0 "not completed", range 145.2 - 272.3 out of 300).There was however a significant difference between the two groups in their prior second year exam marks with those choosing to intercalate before their third year having higher marks. Adjusting for this, the difference in overall exam scores was no longer significant with a mean score difference of 1.4 (-4.9 to +7.7 95% CI, p = 0.66). (overall mean score 238.0 " completed iBSc" students versus 236.5 "not completed").Once possible confounders are controlled for (age, sex, previous academic performance) undertaking an iBSc does not influence third year exam results. One explanation for this confounding in unadjusted results is that students who do better in their second year exams are more likely to take an iBSc before their third year.A BSc, BMedSci or BA degree (iBSc) has long been an optional part of a medical degree in the United Kingdom. Students choose to undertake an extra year of study during their five year medical degree and this is known as intercalating. This contrasts with the practice in some other countries such as the United States where all students are graduates prior to starting a medical degree. In "Tomorrow's Doctors" the UK General Medical Council (GMC) stre
A study of young peoples' attitudes to opportunistic Chlamydia testing in UK general practice
Joanne Heritage, Melvyn Jones
Reproductive Health , 2008, DOI: 10.1186/1742-4755-5-11
Abstract: This is qualitative study that uses focus groups and individual interviews with young adults (age 16 – 18) to assess their views.These young adults were a difficult group to gain access to. Two focus groups, one in a school, the other in a general practice (family practice), and 2 individual interviews were undertaken (total sample 18). Respondents were unfamiliar with Chlamydia, but broadly aware of sexually transmitted infections. General practice (family practice) was perceived as an acceptable place to deliver opportunistic screening, but participants felt that tests should not be initiated by GP receptionists. Novel delivery routes such as schools and "Pub"/Bar dispensing machines were discussed. Issues around stigma and confidentiality were also raised.Opportunistic Chlamydia screening in UK general practice (family practic seems acceptable to young adults. While this is a difficult group to gain access to for research, attempts need to made to ensure acceptability to users of this programme.Chlamydia is a common, important and treatable sexually transmitted infection. Yet Chlamydia infection is asymptomatic in up to 70% of women and 50% of men and left untreated can result in pelvic inflammatory disease, leading to infertility and ectopic pregnancies in women [1]. The prevalence of Chlamydia is estimated to be up to 3% in young adults [2,3]. Prevalence in general practice (GP) or family practice, at the time of cervical smear testing is 2.9% [4]. Young people are particularly vulnerable to Chlamydia infection [5-7], with the under 25s having nearly twice the prevalence of the rest of the population. Chlamydial infection and its consequences cost the NHS in the United Kingdom (UK) in excess of £100 million annually. There is also an important relationship between sexual ill health, poverty and social exclusion [8].There is evidence to support opportunistic Chlamydia testing (OCT) of sexually active women aged under 25 years, especially teenagers and this is su
INCOME NONRESPONSE AND INEQUALITY MEASUREMENT
PARAJE,GUILLERMO; WEEKS,MELVYN;
Revista de análisis económico , 2010, DOI: 10.4067/S0718-88702010000200008
Abstract: this paper analyses the effects that income nonresponse has on certain well-known inequality coefficients (e.g. gini, theil and atkinson indexes). a number of statistical methods have been developed to impute missing values of incomes for nonrespondents. by simulating several patterns of income nonresponse on actual sub-samples of the argentinean household survey, this essay analyses the effects that different correction methods produce on a set of inequality coefficients. it is proved that methods often used to correct for nonresponse can introduce important biases on inequality coefficients if the patterns of missingness assumed by such methods do not coincide with the actual pattern.
Assistance needed for the integration of orphaned and vulnerable children – views of South African family and community members
Melvyn Freeman, Nkululeko Nkomo
SAHARA J (Journal of Social Aspects of HIV/AIDS Research Alliance) , 2006,
Abstract: Guardianship within families is often regarded as the most viable and preferred option for orphaned and vulnerable children (OVC). However, this will place a considerably increased burden on the new caregivers of these children. This study examines whether assistance to prospective families would incline them towards incorporating children and, if so, what would act as ‘threshold' incentives for them. Adults (N = 1 400) in diverse locations and of various ‘relational proximity' to children were interviewed in three high HIV/AIDS prevalence provinces in South Africa. Close relatives were more inclined to take in children and would generally require lower levels of assistance than more distanced adults. Nonetheless, for most poor families, no matter their relation to the child, help is critical. More distanced families, friends and strangers also showed a strong willingness to incorporate children – provided they receive sufficient help. For all categories, the greater the assistance the more likely they would be to take in children. While direct financial assistance was important, assistance with education-related costs and having a trained and caring person come in ‘now and then' to help were also significant factors. The age and HIV status of the child were viewed as important intervening factors in deciding whether or not to take in an additional child/ren by some people.
Review: The Strange Case of William Mumler, Spirit Photographer, by Louis Kaplan
Draper, Melvyn Lloyd
Journal of Historical Biography , 2010,
Abstract:
A detailed study of the accretion disk surrounding the high-mass protostar NGC 7538S
Goran Sandell,Melvyn Wright
Physics , 2010, DOI: 10.1088/0004-637X/715/2/919
Abstract: We present deep high angular resolution observations of the high-mass protostar NGC 7538S, which is in the center of a cold dense cloud core with a radius of 0.5 pc and a mass of ~2,000 Msun. These observations show that NGC 7538S is embedded in a compact elliptical core with a mass of 85 - 115 Msun. The star is surrounded by a rotating accretion disk, which powers a very young, hot molecular outflow approximately perpendicular to the rotating accretion disk. The accretion rate is very high, ~ 1.4 - 2.8 10^-3 Msun yr^-1. Evidence for rotation of the disk surrounding the star is seen in all largely optically thin molecular tracers, H13CN J = 1-0, HN13C J = 1-0, H13CO+ J = 1-0, and DCN J = 3-2. Many molecules appear to be affected by the hot molecular outflow, including DCN and H13CO+. The emission from CH3CN, which has often been used to trace disk rotation in young high-mass stars, is dominated by the outflow, especially at higher K-levels. Our new high-angular resolution observations show that the rotationally supported part of the disk is smaller than we previously estimated. The enclosed mass of the inner, rotationally supported part of the disk (D ~ 5", i.e 14,000 AU) is ~ 14 - 24 Msun.
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