2,618 research outputs found
Micromechanics of fracture of Zr hydrides - underlying data for figures
No full textExcel file containing all data underlying numerical figures
Simulation of the 'brittle-ductile transition in silicon single crystals using dislocation mechanics' - Comment
No full textY.B. Xin and H.J. Hsia modeled the brittle-ductile transition in silicon single crystals by symmetric emission of edge dislocations at a crack tip in {110}〈110〉 oriented specimens on slip planes passing through the crack tip and normal to the cleavage plane. They took into account the dislocation/dislocation interactions only between dislocations on one side of the crack plane. P.B. Hirsch and S.G. Roberts' comments on Xin and Hsia's paper on the simulation of the brittle-ductile transition in silicon single crystals using dislocation mechanics are presented
Detecting differences between the languages of Neandertals and modern humans
No full textItem does not contain fulltextEVOLAN
Marriage record of Roberts, William E. and Bradford, Amanda
No full textMarriage license for William E. Roberts and Amanda Bradford. S.G. Evans was the Justice of the Peace
'The brittle-to-ductile transition .1. A cooperative dislocation generation instability .2. Dislocation dynamics and the strain rate dependence of the transition temperature''' - Comment
No full textP.B. Hirsch and S.G. Roberts (HR) maintain that the model for the brittle-to-ductile transition and its strain rate-dependence proposed by Khantha, Pope and Vitek (KPV) and Khantha (MK), respectively, is inaccurate. HR believe that on the KPV model, the sharp transition is inherently strain rate-independent because the model does not take into account dislocation/lattice interactions which cause velocity-dependent lattice friction stress. As to the MK hypothesis for the strain rate dependence of transition temperature, it does not work for the experimentally observed strain rate-dependent sharp transition for Si, which has been shown to be structure sensitive
University as Destiny: To the 65th Anniversary of Doctor of Historical Sciences, Professor S.G. Sidorov
No full textThe article is prepared for the 65th anniversary of Doctor of Historical Sciences, Professor of the Department of Russian and World History, Archaeology of Volgograd State University Sergey G. Sidorov. The article traces the biography of S.G. Sidorov, his pedagogical, scientific, and administrative activities. It is shown that fundamental foundations of the future pedagogical and scientific work of S.G. Sidorov were laid at the Faculty of History of Saratov State University named after N.G. Chernyshevsky, from which he graduated in 1981. Most of Sergey Grigoryevichs life is connected with Volgograd State University, where he has been working since 1986. He combined teaching historical disciplines with the administrative work. S.G. Sidorov was Vice-rector for Academic Affairs for 25 years. Being in this position he has done a lot to make Volgograd State University a leader in the region in training highly qualified specialists. S.G. Sidorov is one of the leading experts on the history of the Great Patriotic War. He is the author of the first fundamental comprehensive study of using labor of prisoners of war of the Second World War in the national economy of the USSR in 1939–1956. With his active participation, six volumes of Documents and Materials “Prisoners of War in the USSR. 1939–1956” were published. Since 2009, S.G. Sidorov has been the Head of the Dissertation Council on Historical Sciences at Volgograd State University. From 2014 to 2020, largely due to the efforts of S.G. Sidorov, Volgograd State University held five International Thematic Scientific Conferences “Military History of Russia: Problems, Searches, Solutions”
The simulation of free surface flows with Computational Fluid Dynamics
No full textComputational fluid dynamics is a powerful and versatile tool for the analysis of flow problems encountered in themaritime environment. The University of Southampton Fluid-Structure Interactions research group use ANSYS CFX tomodel a wide variety of flow problems; to gain insight into flow physics, improve designs and increase the efficiencyand safety of marine vehicles. A series of three case studies from on-going research looks at: loads applied on liquefiednatural gas tanks due to sloshing, slamming pressures experienced by high speed craft as well as the influence ofpropellers on the resistance characteristics of autonomous underwater vehicles. The presence of the free surface,complex shapes and the unsteady nature of these applications make their simulation with computational fluid dynamicsparticularly challenging. The successful validation of the computational models has resulted in the development of aselection process for suitable multiphase models as well as cost-effective meshing strategies
Early spatial and temporal validation of MODIS LAI product in the Southern Africa Kalahari
No full textWe evaluate the operational MODIS Leaf Area Index (LAI) product using field-sampled data collected at five sites in southern Africa in March 2000. One site (Mongu, Zambia) was sampled monthly throughout the year. All sites were along the International Geosphere Biosphere Programme's (IGBP) Kalahari Transect, which features progressively lower annual precipitation, and hence, lower vegetation productivity, from north to south. The soils are consistently sandy. At each site, we sampled the vegetation overstory along three 750-m transects using the Tracing Radiation and Architecture in Canopies (TRAC) instrument. The resulting plant area index values were adjusted with ancillary stem area data to estimate LAI. Despite some instrument characterization and production issues in the first year of MODIS operations, our results suggest the first-year MODIS LAI algorithm correctly accommodates structural and phenological variability in semiarid woodlands and savannas, and is accurate to within the uncertainty of the validation approach used here. Limitations of this study and its conclusions are also discussed.<br/
What is Comprehensive Geriatric Assessment (CGA)? An umbrella review
No full textBackground: Comprehensive Geriatric Assessment (CGA) is now the accepted gold standard for caring for frail older people in hospital. However, there is uncertainty about identifying and targeting suitable recipients and which patients benefit the most.Objectives: our objectives were to describe the key elements, principal measures of outcome and the characteristics of the main beneficiaries of inpatient CGA.Methods: we used the Joanna Briggs Institute umbrella review method. We searched for systematic reviews and meta-analyses describing CGA services for hospital inpatients in the Cochrane Database of Systematic Reviews, Database of Reviews of Effectiveness (DARE), MEDLINE and EMBASE and a range of other sources.Results: we screened 1,010 titles and evaluated 419 abstracts for eligibility, 143 full articles for relevance and included 24 in a final quality and relevance check. Thirteen reviews, reported in 15 papers, were selected for review. The most widely used definition of CGA was: ‘a multidimensional, multidisciplinary process which identifies medical, social and functional needs, and the development of an integrated/co-ordinated care plan to meet those needs’. Key clinical outcomes included mortality, activities of daily living and dependency. The main beneficiaries were people ≥55 years in receipt of acute care. Frailty in CGA recipients and patient related outcomes were not usually reported.Conclusions: we confirm a widely used definition of CGA. Key outcomes are death, disability and institutionalisation. The main beneficiaries in hospital are older people with acute illness. The presence of frailty has not been widely examined as a determinant of CGA outcome
- …
