265 research outputs found
The production of neutral kaons and lambdas in deep inelastic scattering at H1 and an upper limit on the production cross-section of instantons
No full textSIGLEAvailable from British Library Document Supply Centre-DSC:DXN007140 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Agricultural soil moisture experiment: 1978 Colby (Kansas) data catalog and documentation
No full textThere are no author-identified significant results in this report
Metadata initiatives and emerging technologies to improve resource discovery
No full textThis paper discusses some emerging issues on metadata as a mechanism of resource discovery and its impact on precision of search results in a distributed network environment. It presents a brief account of the recent major developments related to metadata across the globe. Highlights a consistent growth of multiple metadata standards to meet the variety of needs in a hierarchy of complexity. Examines various metadata-harvesting tools and related technologies that fulfill the task implicit in a user’s search. Brings out popular standards, useful protocols, and open-source harvesters along with their intrinsic capabilities for harvesting and presenting metadata and introduces a variety of metadata services viz., OCLC’s catalogue service, UKOLN metadata editor service, OAIster harvester service, DP9 gateway service, etc. explores the underlying principles of metadata-harvesting in DSpace and web search engines. Discusses use of multiple metadata formats in DSpace archives for exposing domain-specific metadata; and the inherent mechanism for extensibility and interoperability functions. Proposes methods for creating metadata that can pursue high-precision document retrieval in dynamic collections. Also discuses semantic web technologies and use of specialized metadata for long-term management and preservation of digital objects
Search for stable hadronising squarks and gluinos with the ATLAS experiment at the LHC
No full textHitherto unobserved long-lived massive particles with electric and/or colour charge are predicted by a range of theories which extend the Standard Model. In this Letter a search is performed at the ATLAS experiment for slow-moving charged particles produced in proton–proton collisions at 7 TeV centre-of-mass energy at the LHC, using a data-set corresponding to an integrated luminosity of 34 pb−1. No deviations from Standard Model expectations are found. This result is interpreted in a framework of supersymmetry models in which coloured sparticles can hadronise into long-lived bound hadronic states, termed R-hadrons, and 95% CL limits are set on the production cross-sections of squarks and gluinos. The influence of R-hadron interactions in matter was studied using a number of different models, and lower mass limits for stable sbottoms and stops are found to be 294 and 309 GeV respectively. The lower mass limit for a stable gluino lies in the range from 562 to 586 GeV depending on the model assumed. Each of these constraints is the most stringent to date
Knowledge Organization Landscape: A Content Analysis of Introductory Courses
No full textThis paper presents the results of a study examining the subject content of knowledge organization courses taught in ALA-accredited LIS programs. Close to 2,000 course readings of introductory-level knowledge organization courses from 34 Library and Information Science (LIS) schools in the U.S. and Canada were analyzed and indexed. Results indicate that traditional bibliographic methods and practices remain at the core of knowledge organization courses. Findings also show that metadata has become a central component of course content and new topics from information architecture to markup languages and semantic web are becoming part of introductory-level knowledge organization education
Author response: AKT isoforms have distinct hippocampal expression and roles in synaptic plasticity
No full textShrub facilitation increases plant diversity along an arid scrubland-temperate rainforest boundary in South America
No full textTheoretical models predict nurse plant facilitation enhances species richness by ameliorating stressful environmental conditions and expanding distributional ranges of stress-intolerant species into harsh environments. We studied the role of nurse facilitation on the recruitment of perennial plants along an arid scrubland–temperate rain forest boundary to test the following predictions: (1) nurse shrub canopy increases seedling abundance and species richness along the rain forest–scrubland boundary; (2) scrubland species are less dependent on facilitative interactions than temperate rain forest species, especially at the moister, upper end of the gradient
Heavy flavour production at the LHC: Theoretical aspects
No full textA proper inclusion of heavy quark mass effects in Parton Distribution Function fits has proved crucial. We present a review these effects in DIS and their impact on global analyses and lay out all elements of a properly defined general mass variable flavor number scheme (GM VFNS) that are shared by all modern formulations of the problem. We also report about progress in a number of theoretical problems related to exclusive measurements of heavy flavors. These topics include fragmentation functions for charmed mesons including finite mass effects, fragmentation functions including non-perturbative corrections based on an effective QCD coupling, a discussion of the status of higherorder calculations for top quark production and for polarized structure functions, heavy quark and quarkonium production in the Regge limit, double heavy baryon production, tests of time reversal and CP symmetry in ∧b decays, as well as a study of the general properties of massive exotic hadrons that will be relevant for an understanding of their detection at the LHC
Stable massive particles at colliders.
No full textWe review the theoretical motivations and experimental status of searches for stable massive particles (SMPs) which could be sufficiently long-lived as to be directly detected at collider experiments. The discovery of such particles would address a number of important questions in modern physics including the origin and composition of dark matter in the universe and the unification of the fundamental forces. This review describes the techniques used in SMP-searches at collider experiments and the limits so far obtained on the production of SMPs which possess various colour, electric and magnetic charge quantum numbers. We also describe theoretical scenarios which predict SMPs along with the phenomenology needed to model their production at colliders and interactions with matter. In addition, the interplay between collider searches and open questions in cosmology such as dark matter composition is addressed
Communities of practice and virtual learning communities : benefits, barriers and success factors
No full textA virtual Community of Practice (CoP) is a network of individuals who share a domain of interest about which they communicate online. The practitioners share resources (for example experiences, problems and solutions, tools, methodologies). Such communication results in the improvement of the knowledge of each participant in the community and contributes to the development of the knowledge within the domain. A virtual learning community may involve the conduct of original research but it is more likely that its main purpose is to increase the knowledge of participants, via formal education or professional development. Virtual learning communities could have learning as their main goal or the elearning could be generated as a side effect. Virtual communities of practice (CoPs) and virtual learning communities are becoming widespread within higher education institutions (HEIs) thanks to technological developments which enable increased communication, interactivity among participants and incorporation of collaborative pedagogical models, specifically through information communications technologies (ICTs) They afford the potential for the combination of synchronous and asynchronous communication, access to -and from- geographically isolated communities and international information sharing. Clearly there are benefits to be derived from sharing and learning within and outwith HEIs. There is a sense of connectedness, of shared passion and a deepening of knowledge to be derived from ongoing interaction. Knowledge development can be continuous, cyclical and fluid. However, barriers exist in virtual CoPs and these are defined by the authors and illustrated with quotes from academic staff who have been involved in CoPs. Critical success factors (CSFs) for a virtual CoP are discussed. These include usability of technology; trust in, and acceptance of, ICTs in communication; a sense of belonging among members; paying attention to cross-national and cross-cultural dimensions of the CoP; shared understandings; a common sense of purpose; use of netiquette and user-friendly language and longevity. The authors recognise the enormous potential for the development of CoPs through e-mail discussion lists and discussion boards but have themselves experienced the difficulties inherent in initiating such a community. These are corroborated and illustrated with text from interviews with academic staff. Much of the literature on CoPs emanates from outside Europe, despite the fact that e-learning articles have a large diffusion around Europe. The authors suggest further exploration of this topic by identifying and studying CoPs and virtual learning communities across EU countries
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