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Search Results: 1 - 10 of 338307 matches for " F.R.; Alvarez Villa "
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Mechanical behaviour of spheriodal graphite cast iron in the temperature range Between -100°c and +100°c
Fierro,V.E.; Sikora,J.A.; Ansaldi,A.F.; Ratto,P.J.J.; Agüera,F.R.; Alvarez Villa,H.N.;
Latin American applied research , 2003,
Abstract: impact tests were done on spheroidal graphite cast iron samples, with five different microstructures. these were obtained by means of the following heat treatments: subcritical annealing, normalizing and two different austempering processes. other samples were tested in their as-cast condition. the tests were carried out in a temperature range from -100°c to +100°c. also, tensile tests and hardness measurements were performed to qualify the samples. every specimen came from a single melt, cast in "y" blocks of two different thicknesses. the impact test results showed an alteration in the fracture behaviour as a function of temperature. the transition temperature, in particular, showed a meaningful shift with the enlargement of the "y" block. this feature can lead to lower performances than expected. the harder and tougher the matrix, the more important this shift was.
Fractomechanical Properties of As-Cast and Austempered SG Cast Iron Between -40 °C and +20 °C
Fierro V.E.,Sikora J.A.,Agüera F.R.,Alvarez Villar H.N.
Materials Research , 2002,
Abstract: The spheroidal graphite (SG) cast iron fractomechanical response varies with the test temperature and with the microstructure parameters. In the present paper, we analyze this variation performing fractomechanical tests in a temperature range from -40°C to +20°C, doing also Charpy and tensile tests for material characterization. The tests were carried out on as-cast samples and heat treated samples to obtain an ADI grade 1. In both cases, we studied samples taken from two well differentiated "Y" block sizes. The results obtained show that, for the chemical composition analyzed, both castings have a fractomechanical response decrease as the temperature diminishes. Besides, the block size enlargement produce a deterioration of the mechanical properties (the fracture toughness, mainly), for both castings.
Acción analgésica de los antihistamínicos: ensayo clínico sobre 56 pacientes afectos de dolores cólicos reno-ureterales en un servicio de urgencias Analgesic effect of antihistaminics H1: Clinical trial carried out with 56 patients with reno-ureteral colic in an Emergency department
F.R. Breijo
Revista de la Sociedad Espa?ola del Dolor , 2007,
Abstract:
SYRACUSE AS VIETNAM: THE CLASSICAL INTERTEXT OF JOSEPH HELLER’S PICTURE THIS
F.R. Pauw
Akroterion , 2012, DOI: 10.7445/54-0-29
Abstract: This article explores the classical intertext of Joseph Heller’s 1988 novel Picture This and its concern with ancient Greek and modern American wars. First, the challenges which the generic peculiarities of the work pose to its interpretation will be investigated. Next, Heller’s postmodernist narrative devices and their effect will be evaluated. Since Picture This deals in large part with classical Athenian history and philosophy,2 this article will also examine Heller’s use of classical sources, including certain factual and terminological errata. The penultimate section argues that Heller’s critical concern with wars and imperialism in classical Athens relates to his perception of the American involvement in the Vietnam War. Finally, I suggest that while Heller’s novel can be read as a warning against the corruptive power of politics and war, he remains sceptical of mankind’s ability to learn from history.
Anthelmintic resistance of nematodes in communally grazed goats in a semi-arid area of South Africa
F.R. Bakunzi
Journal of the South African Veterinary Association , 2012, DOI: 10.4102/jsava.v74i3.516
Abstract: A survey was conducted on the occurrence of anthelmintic resistance of nematodes in communally grazed goats in a semi-arid area in SouthAfrica. In herds belonging to 10 smallholder goat farmers, the efficacies of fenbendazole, levamisole and rafoxanide were tested by faecal egg count reduction (FECR) tests. Efficacies of 80 % were considered a threshold for anthelmintic resistance. The FECR tests showed that all drugs tested more than 80 % effective in most instances, but there were notable exceptions. In 1 case, rafoxanide was only 31 % effective and in another case fenbendazole was only 47 % effective. The occurrence of anthelmintic resistance in this farming sector is of concern. Steps should be taken to prevent its further spread and to avoid the development of a situation as onnumerous commercial sheep farms in South Africa where resistance is very common.
Efficacy of 3 anthelmintics in communally grazed sheep as reflected by faecal egg count reduction tests in a semi-arid area of South Africa : short communication
F.R. Bakunzi
Journal of the South African Veterinary Association , 2012, DOI: 10.4102/jsava.v79i1.243
Abstract: A survey was conducted on the occurrence of anthelmintic resistance of nematodes in communally grazed sheep in a semi-arid area near Mafikeng, South Africa, from January to March 2006. In the herds belonging to twelve smallholder sheep farmers, the efficacies of albendazole, levamisole and closantel were tested by faecal egg count reduction tests where 80 % efficacy was considered the cut off for anthelmintic resistance. The results of the faecal egg count reduction tests showed more than 80 % efficacy with all the drugs used in most cases, but there were notable exceptions. In 1 case, closantel had an efficacy of 72 %, albendazole had an efficacy of 68 % and levamisole showed efficacies of 58 %, 60 % and 75 % respectively on 4 farms. The occurrence of anthelmintic resistance in this farming sector is of concern and steps should be taken to prevent its further spread and development to avoid a situation developing as on numerous commercial sheep farms in South Africa where resistance is common.
Politieke representatie. Betoog over de esthetische staat
F.R. Ankersmit
BMGN : Low Countries Historical Review , 1987,
Abstract:
F.H.M. Grapperhaus, Alva en de tiende penning
F.R. Postma
BMGN : Low Countries Historical Review , 1985,
Abstract:
W.W. Mijnhardt, Teyler 1778-1978. Studies en bijdragen over Teylers Stichting naar aanleiding van het tweede eeuwfeest
F.R. Ankersmit
BMGN : Low Countries Historical Review , 1980,
Abstract:
A.E. Loen, De geschiedenis. Haar plaats, zijn, zin en kenbaarheid
F.R. Ankersmit
BMGN : Low Countries Historical Review , 1975,
Abstract:
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