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AbstractAbstract
[en] Interpretation of brain images from older patients requires knowledge of changes that occur with healthy ageing. We constructed and tested a reference template for older subjects. We used MR images from normal subjects aged 65-70 and 75-80 to generate average age-specific images. We ranked the T2-weighted images by worsening brain tissue loss to create a diagram of key centiles. Two neuroradiologists tested the template during routine reporting; eight radiologists read 99 MR examinations without and then with the template. Fifty-four subjects (65-70 years) and 25 subjects (75-80 years) formed the reference images. For the two neuroradiologists, the reference template reduced the abnormal scan reporting from 28/42 without to 3/42 with the template. Of 99 MR examinations assessed by eight radiologists, 39/58 scans (67%) reported as moderate or severe atrophy without the template were reported as normal with the template (p=0.00011). Reference templates of the brain at older ages can ''calibrate'' radiology reporting. They could also be useful for research into ageing and related conditions. Larger numbers of examinations from more diverse populations and at different ages are required to increase the versatility of these templates. (orig.)
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Available from: http://dx.doi.org/10.1007/s00330-008-1119-2
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[en] In this paper, we study how to generate and accelerate, expansive phenomena within cementitious composites, considering elements of addiction using both fly ash and slag. We present results of monitoring of these processes from the beginning and characterize chemical, microstructural, and crystallographic by X-ray diffraction, backscattering electron microscopy, X-ray dispersive energy and mercury porosimetry. These data are supplemented with values of mechanical behavior of materials to determine their functionality. As a result of these studies, we propose a model for the generation and progression of microcracks for each alteration processes studied. (Author) 7 refs.
Original Title
Generacion y Caracterizacion de Microgrietas en materiales estructurales
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Available http://boletines.secv.es
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Boletin de la Sociedad Espanola de Ceramica y Vidrio; CODEN BSCVB9; v. 51(1); p. 45-54
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[en] Short communication
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[en] We report newly obtained U-Pb SHRIMP ages of detrital zircons from metagreywackes in the Hiriyur Formation (Chitradurga Group, Dharwar Supergroup) from the central eastern part of the Chitradurga greenstone belt. U-Pb analyses yield three major Neoarchean age populations ranging from 2.70 - 2.54 Ga with some minor age population of Mesoarchean. The maximum age of deposition is constrained by the youngest detrital zircon population at 2546 Ma. This is the first report of the occurrence of supracrustal rocks less than 2.58 Ga in the central part of Chitradurga greenstone belt. Close evaluation of detrital ages with the published ages of surrounding igneous rocks suggest that the youngest detrital zircons might be derived from rocks of the Eastern Dharwar craton and the inferred docking of the western and eastern Dharwar cratons happened prior to the deposition of the Hiriyur Formation. The Chitradurga shear zone, dividing the Dharwar craton into western and eastern blocks, probably developed after the deposition. Furthermore, the lower intercept is interpreted as evidence for the Pan-African overprints in the study area. (author)
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44 refs., 3 figs., 2 tabs.
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Journal of the Geological Society of India; CODEN JGSIAJ; v. 87(1); p. 43-54
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[en] A lot of experimental data concerning homogeneity and devitrification of R7T7 glass have been published. It appears that: - the crystallization process is very limited, - the interfaces due to bubbles and the container wall favor crystallization locally but the ratio of crystallized volume remains always below a few per cents, and - crystallization has no damaging long-term effects as far as leaching tests can be trusted. (A.C.)
Original Title
Conclusion concernant le theme 3: homogeneite et devitrification
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1997; 2 p; CEA/Valrho summer session. Glass scientific research for high performance containment; Universite d'ete CEA/Valrho. Le Verre: recherche scientifique pour un confinement de haute performance; Mejannes-Le-Clap (France); 31 Aug - 7 Sep 1997
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[en] The luminescence techniques have evolved over the last 40 years to a powerful dating instrument in archaeology and geoscience. Depending on how the luminescence is stimulated, one distinguishes the phenomena of thermoluminescence (TL), optically stimulated luminescence (OSL) and infrared stimulated luminescence (IRSL). Each of these phenomena has its specific potential for dating various archaeological materals in the time range from medieval back to palaeolithic periods, or, speaking in geological terms, for dating of Holocene and late Pleistocene objects. The OSL and IRSL techniques are sometimes treated together as 'optical dating'. The luminescence techniques differ from other major dating techniques, such as 14C, essentially by their applicability to inorganic materials, their wide age-range from about 100 years to more than 100,000 years and the kind of datable events which are the last exposure to heat or to light. (author). 10 refs., 3 figs
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Prior, C.A.; Rogers, K.M.; Faure, K.; Vandergoes, M.J. (eds.); GNS Science, Lower Hutt (New Zealand); 1 v; 2008; p. 115-121; GNS Science; Lower Hutt (New Zealand); 5. Quaternary Techniques Short Course; Lower Hutt (New Zealand); 22-23 May 2008
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[en] Following CT observation of the hip muscles on the upper margin of the pelvic symphysis, we discussed the relationship of body movements with aging. The muscles of 137 healthy adults (76 males, 61 females) were studied: gluteus maximus, gluteus medius, tensor fasciae latae, iliopsoas, rectus femoris, sartorius and pectineus. Cross-sectional areas (CSA) showed the gluteus maximus to be the largest (60%) of the whole muscular CSA; next were the gluteus medius and the iliopsoas (10%), the tensor fasciae latae (6%), and the remaining muscles (5%). Relative values were compared to males in their 20s and subsequent decades. The gluteus maximus and the sartorius of males in their 30s composed 65%, while the rectus femoris and the tensor fasciae latae made up less than 60%. Lack of intensive body movement in their 30s resulted in a marked reduction of muscular CSA. Those in their 50s were shown to have 70∼60% on the iliopsoas, pectinius and gluteus medius; those in their 70s, 60∼50%. Slow reductions of whole muscle result in a decrease of step length, an expansion of the base support width, and inflexibility of the legs. For females, comparisons were made with those in their 30s. CSA of the rectus femoris and pectinius showed a decrease in their 40s and values under 60% in their 70s, equal to the rates in males. Other muscles of females increased in their 40s, 50s and 60s and decreased in their 70s. (author)
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Showa Igakkai Zasshi; ISSN 0037-4342;
; v. 63(6); p. 531-540

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[en] The stratigraphy, palaeontology and age of the Las Ventanas Formation (FmLV) is here analyzed. Its type area represents a large syncline (Cerro Las Ventanas Syncline) with an axis plounging 35 grades to the S20W. The lithostratigraphy of the FmLV is described, and separated into the following informal units: basic volcanics and breccias, polymictic conglomerates, sandstones and conglomerates, and laminated pelites. The Formation represents a thinning- and fining-upward sequence, recording evolution from an alluvial fan-dominated environment to shallow marine conditions with occasional storms. Sedimentary structures and petrography of conglomerates and sandstones point to a steep palaeorelief. A number of organic-walled microfossils is described for the first time, namely: Leiosphaeridia tenuissima, L. minutissima, Lophosphaeridium sp., Soldadophycus bossii, S. major, Soldadophycus sp., Vendotaenia sp. and psilate, branched filaments. The assemblage is characterized by its low diversity, abundance and large size (up to 400 μm) of Leiosphaeridia. Wrinkle structures occur in the laminated pelite unit. Based on the microfossils we assign the FmLV to the lower Vendian (Varangerian, ca. 600 Ma). The Playa Hermosa Formation can be interpreted as a lateral facies of the FmLV, or be alternatively- younger than the latter unit. On the basis of microfossil assemblages, we envisage that the FmLV immediately predates the Arroyo del Soldado Group. An extensional geotectonic setting, possibly a rift, is postulated for FmLV. This is a contribution to project IGCP 478. Keywords: Neoproterozoic, Vendian, Varangerian, Uruguay, acritarchs
[es]
Se analiza la estratigrafia, paleontologia y edad de la Formacion Las Ventanas (FmLV). El area tipo de afloramiento de la FmLV corresponde a un gran sinclinal (Sinclinal del Cerro Las Ventanas) con eje buzante 35 grados al S20W. Se describe la litoestratigrafia para la FmLV separandola en las siguientes unidades informales (de base a tope): vulcanitas basicas y brechas, conglomerados polimicticos, areniscas y conglomerados, y pelitas laminadas. La Formacion representa una secuencia grano y estrato decreciente, evolucionando de un ambiente continental dominado por abanicos aluviales a un ambiente marino somero con la ocurrencia de tempestitas. La paleopendiente fue importante, como lo indican las estructuras sedimentarias y la petrografia de conglomerados y areniscas. Se describen por primera vez una serie de microfosiles de pared organica para la FmLV, a saber: Leiosphaeridia tenuissima, L. minutissima, Lophosphaeridium sp., Soldadophycus bossii, S. major, Soldadophycus sp., Vendotaenia sp. y filamentos lisos ramificados. La asociacion se destaca por su baja diversidad, abundancia de Leiosphaeridia y el gran tama..o de la mismas (hasta 400 μm). Se describen asimismo estructuras de biomatas (wrinkle structures) de la unidad de pelitas laminadas de la FmLV. En base a los microfosiles se le asigna a la FmLV una edad mas probable Vendiano inferior (Varangeriano, ca. 600 Ma). La Formacion Playa Hermosa puede ser un facies lateral de la FmLV, o bien encontrarse estratigraficamente por encima de la misma. De acuerdo al contenido micropaleontologico de la FmLV, se postula una cercania temporal con el Grupo Arroyo del Soldado, posiblemente anterior al mismo. El ambiente geotectonico mas probable para la FmLV es extensional, y especificamente de rift. Esta es una contribucion al proyecto IGCP 478. Palabras clave: Neoproterozoico, Vendiano, Varangeriano, Uruguay, acritarcasOriginal Title
Estratigrafia, paleontologia y edad de la formacion las Ventanas (neoproterozoico , Uruguay)
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Sociedad Uruguaya de Geologia, Montevideo (Uruguay). Funding organisation: Dinamige (Uruguay); Asociacion de Licenciados en Geologia (Uruguay); Unesco(Uruguay); Ministerio de Ordenamiento Territorial y Medioambiente(Uruguay); ANCAP (Uruguay); Facultad de Ciencias, Montevideo (Uruguay); [1 CD]; Sep 2004; p. 1-11; 4. Uruguayan Geological Congress - II meeting about environmental geology and territorial ordinance; Cuarto Congreso Uruguayo de Geologia II Reunion de Geologia Ambiental y ordenamiento Territorial del Mercosur; Montevideo (Uruguay); 8-10 Sep 2004; Available from DNETN Library; Include: Email: blancogonzalo2@hotmail.com
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Maeng, Hansol; Lee, Seok-Jae; Choi, Young, E-mail: seokjaelee@jbnu.ac.kr2017
AbstractAbstract
[en] In the present study, we propose an aging parameter based on the aging temperature and the holding time, in order to quantify the degree of aging in aluminum alloys. The variations in hardness and tensile properties associated with different aging conditions were experimentally observed and expressed on a single curve according to the aging progression, which was quantitatively evaluated using the proposed parameter. The use of the proposed parameter provides a map of the hardness distribution and enables the determination of the optimum condition of the aging treatment, not only for maximizing the hardness value, but also for preventing the over-aging phenomenon. (paper)
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Available from http://dx.doi.org/10.1088/2053-1591/aa7dbc; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Materials Research Express (Online); ISSN 2053-1591;
; v. 4(7); [6 p.]

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[en] Short communication
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