Discs of an extruded AZ80 magnesium alloy were processed by high-pressure torsion (HPT) using 6.0 GPa up to 10 turns at different temperatures (296 K and 473 K). The disc surfaces and cross-sectional planes were examined before and after processing using scanning electron microscopy (SEM) and Vickers microhardness (Hv). The microhardness results at the surface show differences in the strength o...

A hybrid finite-discrete element method (FDEM) is proposed to model rock fracture initiation and propagation during a three-point bending test under quasistatic dynamic loading conditions. Three models have been implemented in the FDEM transition from continuum discontinuum through fragmentation. The rate effect on behaviour has taken into account by implementation of relationship between stati...

Studying the dynamic properties of rocks in complex environments is great significance to sustainable development deep-sea metal mineral resource extraction. To investigate influence dry–wet cycles on tensile and energy dissipation red sandstone, a series Brazilian disc tests was carried out through split Hopkinson pressure bar (SHPB) apparatus. The behaviors distribution sandstone specimens af...

The original DDARF (discontinuous deformation analysis for rock failure) can only generate uniform grids, and the increase in number of grids reduces efficiency calculation, which limits use large-scale geotechnical engineering. This is a problem that needs to be solved DDARF. A new method proposed this paper optimize generation DDARF, optimized heterogeneous grids. model Brazilian disc-splitti...

OBJECTIVE To understand the meaning assigned to ethical thought that should guide Brazilian bioethicists regarding the equity of a Health System. METHODS Between July 2007 and July 2008, 20 bioethicists, directors and former directors of the 'Sociedade Brasileira de Bioética' (Bioethics Brazilian Society) and their regional administrations were interviewed. RESULTS Discourse analysis led to...

Cassava is regarded as the nutritional base of populations in developing countries, and flour, product made of cassava, is the most consumed in the world. The cassava leaves are very rich in vegetable proteins, but a big amount is lost in processing the crop. The objective of this study was to do a sensory evaluation of cassava flour to which a protein concentrate obtained from cassava leaves (...

background & importance: disc herniation is defined as the prolapsed of material disc into the spinal canal. if the disc fragment is free in spinal canal, it is called sequestration disc fragment. occasionally, alteration in sequestration disc fragment makes the diagnosis of the disc herniation, challenging. case presentation: we reviewed a rare case of the cervical sequestrated disc herniation...

South America is responsible for about half of the cassava world production. In the 1970's productivity of the crop on the continent was about 15 ton/ha, and dropped continuously until reaching 12 ton/ha in 2004. India's productivity of cassava increased from 10 ton/ha in the 1970's to 28 ton/ha in 2004. Brazil contributed significantly to improving cassava crops through the Instituto Agronômic...

An assessment is made here of the role played by the micropolar continuum theory on the cracked Brazilian disc test used for determining rock fracture toughness. By analytically solving the corresponding mixed boundary-value problems and employing singular-perturbation arguments, we provide closed-form expressions for the energy release rate and the corresponding stress-intensity factors for bo...