4,509 research outputs found
Flare observation during Max 1991 balloon campaigns
A brief overview is presented for some of the large flare properties as observed during the prime SMM flare observation interval, 1980 to 1984. Two of these properties, namely their tendency to occur in groups and the strong effects of the 154 day periodicity, can be used to increase the probability of detecting large flares during the limited observing duration of Max 1991 balloon campaigns provided the solar flare characteristics of the 1991 solar cycle follows that observed in 1980 to 1984
Challenges and Lessons Learned in the Application of Autonomy to Space Operations
NASA's Space Operations Management Office (SOMO) is working toward a goal of providing an integrated infrastructure of mission and data services for space missions undertaken by NASA enterprises. A significant portion of this effort is focused on reducing the cost of these services. We are interested in the potential of autonomy to reduce operations costs. SOMO services support space missions, but are not part of the mission objectives; therefore the level of acceptable risk is very low. In fact, SOMO could be effective ly prevented from applying autonomy if customers merely perceive it as adding risk to their mission(s). We are interested in this workshop from the standpoint of understanding what can be done to realize the potential cost savings due to autonomy while maintaining acceptable risk and serving the needs of our customers. We would like to present our lessons learned so far in adopting autonomy and automation, which we think will contribute to clarifying the challenges facing the use of such technology. SOMO provides services to a diverse and ambitious set of mission customers. Many of these missions are groundbreaking missions for which communications, data, and other operations requirements sometimes cannot be clearly articulated early in the program. This motivates a need for systems that are robust in the face of unanticipated situations so that customer missions are not unreasonably constrained or impacted by "shortcomings" in SOMO services. One of SOMO's primary goals is to realize a paradigm in which SOMO acts as a service provider to organizations that fly space missions for NASA, other government agencies, and even the commercial sector. These organizations purchase SOMO services "by the pound" as customers. We have to provide systems that are not experiments themselves, but rather stable bases from which to do bold experiments. To this end, SOMO also seeks to work closely with industry to see that robust autonomy technology gets infused into products and services for the space industry and beyond. The potential for application of these technologies spans space-based communications networks (e.g. TDRSS) and ground-based assets including communication and tracking antenna systems, data networks, and control centers. There are several problems that are candidates for the application of autonomy, if it can be made reliable enough, including: antenna control, antenna scheduling, communication link scheduling and operation, navigation, attitude determination, fault detection, isolation, and reconfiguration (for spacecraft or ground assets), and mission-level planning and scheduling. Some attempts have been made to apply autonomy and automation in these areas in the past with varying degrees of success. We will present relevant case histories and the lessons inferred from them. Combining this past experience with anticipated future needs, we can clarify the challenges that must be met in order to realize the benefits of autonomy
Gambling in Asian Communities in Great Britain
Abstract
This paper examines the prevalence of gambling and problem gambling among people of Indian, Pakistani, and Bangladeshi cultural backgrounds living in Great Britain. Information was gathered from the last two versions of a large-scale national adult prevalence survey and a similar survey of children aged 11 to 15 years, all conducted since 2007. Together, the surveys yielded sub-samples of 589 Asian adults and 482 Asian children from a combined total of more than 16,000 adults and nearly 9,000 children. In both adult and child Asian populations, the 7-day participation rate in gambling (22% and 13%, respectively) was found to be low relative to that in the white majority community, yet problem gambling prevalence, measured by the adult Diagnostic and Statistical Manual of Mental Disorders, 4th edition screen (1.4%) and its juvenile equivalent (2.9%), was significantly higher, including among women. It therefore follows that those Asians who do gamble are unusually prone to experiencing problems, which has implications for public health policies such as the provision of information and help in minority languages. The relevance of the findings seems likely to extend to other countries with significantly sized Asian communities.</jats:p
The Twelfth Man? Refereeing Bias in English and German Soccer
This paper investigates potential bias in awards of player disciplinary sanctions, in the form of cautions (yellow cards) and dismissals (red cards) by referees in the English Premier League and the Bundesliga. Previous studies of behaviour of soccer referees have not adequately incorporated within-game information. Descriptive statistics from our samples clearly show that home teams receive fewer yellow and red cards than away teams. But biases may be wrongly identified where the modeller has failed to include within-game events such as goals scored and recent cards issued. What appears as referee favouritism may actually be excessive and illegal aggressive behaviour by players in teams that are behind in score. We deal with these issues using a minute-by-minute bivariate probit analysis of yellow and red cards issued in games over six seasons in the two leagues. The significance of a variable to denote score difference at the time of sanction suggests that excessive effort, induced by a losing position, is an important influence on award of yellow and red cards. Controlling for a number of pre-game and within-game variables, we find evidence of home team favouritism in Germany as home teams with running tracks in their stadia attract more yellow and red cards than teams playing in stadia with separation of fans from pitch. This is indicative of referee response to social pressure. Separating the competing teams in matches by favourite and underdog status, as perceived by the betting market, yields further evidence, this time for both leagues, that the source of home teams receiving fewer cards is not just that they are disproportionately often the favoured team. Rather, there appears to be pure referee bias in relative treatments of home and away teams.Soccer, football, referee, sports
Single-peptide DNA-dependent RNA polymerase homologous to multi-subunit RNA polymerase
Transcription in all living organisms is accomplished by multi-subunit RNA polymerases (msRNAPs). msRNAPs are highly conserved in evolution and invariably share a B400 kDa five-subunit catalytic core. Here we characterize a hypothetical B100 kDa single-chain protein, YonO, encoded by the SPb prophage of Bacillus subtilis. YonO shares very distant homology with msRNAPs, but no homology with single-subunit polymerases. We show that despite homology to only a few amino acids of msRNAP, and the absence of most of the conserved domains, YonO is a highly processive DNA-dependent RNA polymerase. We demonstrate that YonO is a bona fide RNAP of the SPb bacteriophage that specifically transcribes its late genes, and thus represents a novel type of bacteriophage RNAPs. YonO and related proteins present in various bacteria and bacteriophages have diverged from msRNAPs before the Last Universal Common Ancestor, and, thus, may resemble the single-subunit ancestor of all msRNAPs
The Role of the Arts in Education for Peacebuilding, Diversity and Intercultural Understanding: A Comparative Study of Educational Policies in Australia and Spain
This article reviews and analyses educational policies and curricula for general education in Australian and Spanish systems, in relation to their concerns for arts education to contribute to values education and the acquisition of peaceful, social and civic competences in schools. The use of the arts to shape individual and community identities, to enhance relationships between people, to promote positive conflict transformation, development and, in general, contribute to peacebuilding, has been acknowledged worldwide. Curriculum helps to legitimise what is considered to be important to learn within a society and therefore determines what is included to be understood as good artistic knowledge and practices. The documentary analysis of both Australian and Spanish educational documents in relation to teaching and learning of the arts gives responses on the extent the arts are expected to contribute to build peaceful and sustainable societies, and faces some current challenges of the role of the arts in schools.This work was supported by the University Jaume I of Castellón (Spain) under Research project P1·1A-2015-01
A MARKETING-SYSTEM APPROACH TO REMOVING DISTRIBUTION BARRIERS CONFRONTING SMALL-VOLUME FRUIT AND VEGETABLE GROWERS
Marketing,
The scale of segregation:ancestral groups in Sydney, 2011
Most studies of urban residential segregation analyse it at a single-scale only, usually the smallest for which relevant census data are available. Following a recent argument that such segregation is multiscalar, this paper reports on multilevel modelling of the segregation of 42 ancestral groups in Sydney, Australia, looking at its intensity at four separate scales in which segregation at each scale is presented nett of its intensity at all higher-level scales. Most groups are more segregated at the macro- and micro-scales than at two intermediate meso-scales, with variations across them reflecting their size, recency of arrival in Australia and cultural differences from the host society. The findings are used as the basis for developing a multiscale appreciation of residential patterning.24 page(s
Is there a preference for PET or SPECT brain imaging in diagnosing dementia? The views of people with dementia, carers, and healthy controls
- …
