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Search Results: 1 - 10 of 549812 matches for " Craievich A.F. "
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Synchrotron SAXS Studies of Nanostructured Materials and Colloidal Solutions: A Review
Craievich, A.F.;
Materials Research , 2002, DOI: 10.1590/S1516-14392002000100002
Abstract: structural characterisations using the saxs technique in a number of nanoheterogeneous materials and liquid solutions are reviewed. the studied systems are protein (lysozyme)/water solutions, colloidal zno particles/water sols, nanoporous nio-based xerogels, hybrid organic-inorganic siloxane-peg and ppg nanocomposites and pbte semiconductor nanocrystals embedded in a glass matrix. these investigations also focus on the transformations of time-varying structures and on structural changes related to variations in temperature and composition. the reviewed investigations aim at explaining the unusual and often interesting properties of nanostructured materials and solutions. most of the reported studies were carried out using the saxs beamline at the national synchrotron light laboratory (lnls), campinas, brazil.
Synchrotron SAXS Studies of Nanostructured Materials and Colloidal Solutions: A Review
Craievich A.F.
Materials Research , 2002,
Abstract: Structural characterisations using the SAXS technique in a number of nanoheterogeneous materials and liquid solutions are reviewed. The studied systems are protein (lysozyme)/water solutions, colloidal ZnO particles/water sols, nanoporous NiO-based xerogels, hybrid organic-inorganic siloxane-PEG and PPG nanocomposites and PbTe semiconductor nanocrystals embedded in a glass matrix. These investigations also focus on the transformations of time-varying structures and on structural changes related to variations in temperature and composition. The reviewed investigations aim at explaining the unusual and often interesting properties of nanostructured materials and solutions. Most of the reported studies were carried out using the SAXS beamline at the National Synchrotron Light Laboratory (LNLS), Campinas, Brazil.
The Case of Development Communication: Perspectives, Issues and Trends
Mathew,A.F.;
Palabra Clave , 2010,
Abstract: the purpose of this paper is to provide an overview of development communication. to do so, the first section focuses on the theoretical perspective and evolution of development communication. the second section deals with selected examples from the third world, and the final section is a summary
Que hipóteses estatísticas testamos através do SAS em presen?a de caselas vazias?
Iemma, A.F.;
Scientia Agricola , 1995, DOI: 10.1590/S0103-90161995000200002
Abstract: the interpretation of the tested hypothesis through variance analysis of balanced agricultural data, can be made, in general, without great difficulties, specially hi the case of well designed and well conducted experiments. if, however, data is not balanced and missing plots are present, the interpretation of the tested hypothesis through the sums of squares given by the available statistical packages, may be extremely difficult for statisticians, and practically impossible for profissionals of applied sciences, which use these packages. in this study, the interpretation of the most common tested hypothesis is discussed through the general linear models (glm) procedure of the statistical analysis system (sas), with the objective of alerting users about the problems related to the choice of the hypothesis that best reflects the objectives of his research.
New business dictionary/ nuwe sakewoordeboek.
A.F Prinsloo
Lexikos , 2004,
Abstract: J.D.U. Geldenhuys en E.E. Viljoen-Smook. New Business Dictionary/ Nuwe Sakewoordeboek. Fourth, revised and expanded edition/Vierde, hersiene en uitgebreide uitgawe. 2003, xxi + 315 pp. ISBN 1 86890 038 X. Cape Town/Kaapstad: Pharos Dictionaries/Pharos Woordeboeke. Prys: R140.
Sheep Fetal Thyroid Histological Development, with Adult Plasma T4 and T3 Hormones Concentrations
A.F. Alwan
Journal of Animal and Veterinary Advances , 2012,
Abstract: Thyroid hormones plasma concentrations values of 80 apparently healthy Iraqi sheep (40 ewes and 40 rams) were studied. The mean plasma T4 and T3 for ewes were 54.8±6.2 and 1.06±0.04 ng mL-1, respectively. The mean T4 and T3 were decreases as the age of rams progress, while in late pregnant ewes the mean T4 and T3 were significantly p<0.01 more than that of lactating and old ewes. The mean thyroid hormones value of both lactating and old ewes were, also significantly (p<0.01) different. The fetal thyroid gland weight were increased from 18-972.6 mg as fetal CRL increased from 5-45 cm. Histologically thyroid follicles containing colloid were seen at 20 cm CRL and follicles increased in number, size and colloid content as fetal CRL increased toward birth. The effect of age and sex of sheep produce different degree of variation in the thyroid hormones concentrations. The high levels of T4 and T3 in late pregnancy is essential for fetal growth and development. Fetal thyroid is functioning during gestation.
Frans van Niekerk, Joey Basson en Kobus Grobler (Samestellers). Wilde Woordeboek.
A.F. Prinsloo
Lexikos , 2012, DOI: 10.5788/9-1-932
Abstract: Review of Frans van Niekerk, Joey Basson en Kobus Grobler (Samestellers). Wilde Woordeboek. Resensie van Frans van Niekerk, Joey Basson en Kobus Grobler (Samestellers). Wilde Woordeboek.
J.D.U. Geldenhuys en E.E. Viljoen-Smook. New Business Dictionary/ Nuwe Sakewoordeboek
A.F. Prinsloo
Lexikos , 2011, DOI: 10.5788/14--703
Abstract: Die New Business Dictionary / Nuwe Sakewoordeboek van Geldenhuys en Viljoen- Smook (hierna G en VS) kan tereg bestempel word nie net as 'n nuwe sakewoordeboek nie, maar ook as 'n nuwesakewoordeboek. Om dit te verklaar, moet die sakeagtergrond in ag geneem word waarteen hierdie nuutste aanvulling tot die Afrikaanse vakwoordeboekkorpus saamgestel is.
The Case of Development Communication: Perspectives, Issues and Trends
A.F. Mathew
Palabra Clave , 2010,
Abstract: El propósito de este trabajo es proporcionar una visión general de comunicación para el desarrollo. Para este fin, la primera sección se centra en la perspectiva teórica y evolución de la comunicación para el desarrollo. La segunda sección trata de ejemplos seleccionados del Tercer Mundo, y la sección final es un resumen
Andesita Cerro Bola: Nueva unidad vinculada al magmatismo mioceno de la Cordillera de Olivares, San Juan, Argentina (30°35′S; 69°30′O) Cerro Bola Andesite: New unit linked to the Miocene magmatism of the Olivares Cordillera, San Juan (30°35' S ; 68°30' W)
A.F. Wetten
Revista de la Asociación Geológica Argentina , 2005,
Abstract: El área de estudio se halla en la zona de Tocota, inmediatamente al este de la Cordillera de Olivares, en el borde oriental de la Cordillera Frontal, provincia de San Juan. En ella se encuentran unidades ígneas y sedimentarias del ciclo gondwánico, las que fueron intruidas y cubiertas en relación discordante por cuerpos subvolcánicos y volcánicos asignados anteriormente al ciclo ándico en sentido amplio, los cuales constituyen el principal objeto del presente estudio. Estos cuerpos han sido mapeados a fin de poder caracterizarlos adecuadamente, en el contexto estratigráfico de la región. Los afloramientos de interés han sido reconocidos en el cerro Bola y alrededores, donde se observan distribuidos irregularmente, cubriendo un área superior a 5 km2. Las rocas, de coloración gris clara y composición andesítica - fenoandesítica, presentan estructuras de domo y colada. Estos afloramientos serían correlacionables con la unidad volcánica Pircas (Mioceno), la que aflora al oeste, y conformarían un evento magmático posterior al de pórfidos de diferente composición situados tanto en el arroyo Chita como en el cerro Divisadero. La extensión del área involucrada, la uniformidad litológica, el bajo grado de alteración y una edad radimétrica obtenida por el método K/Ar, fueron considerados para proponer a estas volcanitas como una unidad litoestratigráfica de edad miocena superior, con la denominación de Andesita Cerro Bola. The study area is located in the region of Tocota Creek, close to the Cordillera Olivares, eastern border of the Frontal Range, San Juan province. In this place, igneous and sedimentary units belonging to the Gondwanic cycle, were recognized. These units were intruded and unconformably covered by subvolcanic and volcanic bodies, which were commonly referred to the Tertiary or Andean cycle. The study of these bodies is the main proposal of this work. These bodies had been mapped in order to characterize them properly in the regional stratigraphic context. The main outcrops were recognized in the Bola Hill and surroundings, where they are irregularly distributed, covering an area greater than 5 km2. Dome and lava flow structures are present with the light gray andesite - phenoandesite rock. These outcrops can be correlated with the Pircas volcanic unit (Miocene), to the west, and could be further related to other porphyry bodies of different composition, situated both in Chita Creek and in Divisadero Hill. The extension of the area, lithological uniformity, the low alteration and a K/Ar radiometric age were considered, in order to propose these s
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