29 research outputs found
Cr2C3âNiCr VPS thermal spray coatings as candidate for chromium replacement
The present investigation has been carried out with the aim of determining the tribological behavior of a VPS chromium carbide coating both in the as-deposited and heat-treated conditions. A commercial powder of Cr2C3â25% NiCr was sprayed employing a VPS system (Medicoat AG, Switzerland) onto plain low carbon steel coupons. The samples were subsequently annealed for 2 h at 600 °C, 800 °C and 900 °C in Ar. The microstructural characterization was carried out by using SEM and XRD before and after the heat treatment of the samples. SEM observations were employed for determining the degradation mechanisms that took place during the wear tests. When the coated systems rubbed against alumina under a 5 N normal load in air, a progressive change in the mechanism, from a mixed adhesive and abrasive, to a predominant abrasive was observed, as the heat treatment temperature increased. The wear constants were found to be of the order of approximately 10â 6 mm3/N.m, which indicates a wear resistance of nearly 4 times higher in comparison with the wear results reported in the literature for similar coating systems obtained by employing HVOF deposition. However, the heat treatment carried out at 900 °C brought about only 20% increase in the sliding wear resistance of the coated system
The state of the Martian climate
60°N was +2.0°C, relative to the 1981â2010 average value (Fig. 5.1). This marks a new high for the record. The average annual surface air temperature (SAT) anomaly for 2016 for land stations north of starting in 1900, and is a significant increase over the previous highest value of +1.2°C, which was observed in 2007, 2011, and 2015. Average global annual temperatures also showed record values in 2015 and 2016. Currently, the Arctic is warming at more than twice the rate of lower latitudes
OcorrĂȘncia de Giardia, Cryptosporidium e microsporĂdios em animais silvestres em ĂĄrea de desmatamento no Estado de SĂŁo Paulo, Brasil
Fatal pulmonary microsporidiosis due to encephalitozoon cuniculi following allogeneic bone marrow transplantation for acute myelogenous leukemia.
Encephalitozoon cuniculi–associated equine encephalitis : a case report
A case of encephalitis of unknown origin in the horse was investigated. Postmortem
examination findings revealed a nonsuppurative granulomatous meningoencephalitis in
the right hemisphere of the cerebral cortex. Testing for West Nile virus, equine herpes
virus, equine infectious anemia, Toxoplasma gondii, Neospora caninum, and Sarcocystis
neurona were negative. The horse had a titer for Encephalitozoon cuniculi, and sections
from the affected area of the brain tested positive for the organism using both polymerase
chain reaction (PCR) and immunohistochemistry. Amplicons generated using PCR were
sequenced, and E. cuniculi genotype II was identified. This is the first case of E. cuniculi
genotype II associated with encephalitis in the horse