Crater
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. Study of the anti-penetration performance of concrete with different coarse aggregate content
Abstract Deep penetration experiments were performed on five types of concrete with different coarse aggregate content. The projectile diameter was 29.9 mm, the initial velocity was 647 m/s, and the volume fraction of the coarse aggregate was between 0% and 59.0%. The damage laws and damage mechanism of the target were analyzed. The pure mortar target had t
Lat. Am. j. solids struct.. Publicado em: 02/07/2018
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2. High-velocity Penetration of Concrete Targets with Three Types of Projectiles: Experiments and Analysis
Abstract This study conducted high-velocity penetration experiments using conventional ogive-nose, double-ogive-nose, and grooved-tapered projectiles of approximately 2.5 kg and initial velocities between 1000 and 1360 m/s to penetrate or perforate concrete targets with unconfined compressive strengths of nominally 40MPa. The penetration performance data of
Lat. Am. j. solids struct.. Publicado em: 2017-09
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3. Porokeratosis simulating Bowen’s disease on dermoscopy
Abstract Porokeratosis is a disorder of epidermal keratinization characterized by the presence of annular hyperkeratotic plaques. Its etiopathogenesis is not yet fully understood, but a relationship with immunosuppression has been reported. Dermoscopic examination revealed a classic yellowish-white ring-like structure that resembled “volcanic crater contou
An. Bras. Dermatol.. Publicado em: 2016-10
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4. Imported cutaneous leishmaniasis caused by Leishmania major in a Chinese laborer who worked in Saudi Arabia
Abstract: We report an imported case of cutaneous leishmaniasis in a 37-year-old man from Saudi Arabia caused by Leishmania major. He presented with non-healing nodulo-ulcerative lesions with a "volcanic crater" on the lower limbs. It was clearly cutaneous leishmaniasis - a rare disease in China - as reflected by the patient's clinical history, the lesions'
An. Bras. Dermatol.. Publicado em: 2016-06
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5. Methods of data analysis for the ball cratering test on TiN and DLC coated steel
Titanium nitride (TiN) coatings are widely used in machining because of its mechanical characteristics which modify the surface of the substrate increasing the capacity of load support and reduction of friction, while a coating as diamond-like carbon (DLC), which also has interesting mechanical properties, needs better attention. In this sense, the developme
Mat. Res.. Publicado em: 05/02/2016
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6. Fractografía y disipación de energía cinética en un panel balístico de cerámica/polímero sometido al impacto de un proyectil metálico
In this study we have explored the behavior and the damage mechanisms of a laminate panel composed of polymeric and ceramic materials, submitted to the impact of a metallic projectile. The design of a system with the impact side in ceramic material (SiC) was made, with a support of an ultra-high molecular weight polyethylene (UHMWPE), plaques made with 200 m
Matéria (Rio J.). Publicado em: 2013-09
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7. Wear mechanisms of dental composite restorative materials by two different in-vitro methods
In this work two very simple apparatuses, namely the ball crater (or ball-on-plate) and the linear reciprocating (or pin-on-plate) tests, were used in order to investigate the wear mechanisms of TPH Spectrum® and Resilab Master® dental composite resins. Loads in the range of 100 g to 1 kg and a total number of up to 24000 cycles were employed. During some
Mat. Res.. Publicado em: 21/12/2012
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8. Implications of landforms in connection with soil versus evolution and installation of the tunnels / ImplicaÃÃes da relaÃÃo solo versus relevo na instalaÃÃo e evoluÃÃo de tÃneis
Whereas erosion is a process that detracts from the soil, reducing its productivity or even making impossible the food production in it, it is worth emphasizing the importance of studies on this topic, especially with explanations and solutions to problems found in areas that are degraded by erosive processes. The installation and evolution of this process d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/08/2011
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9. Effect of Ti and Nb Additions on the Formation of Craters for IF Steel Galvanneal Coatings
Interstitial Free steels feature alloying elements present in an ultra low C matrix that account for C stabilization and consequently a high number of C free interstitials in a ferrite matrix that give these steels the ideal texture, low yield point, favorable plastic strain ratios, high elongation and n-value necessary for an ideal performance on forming pr
Publicado em: 2009
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10. Reaction of accessions of melon to Myrothecium roridum and heritage of resistance to rot-of-crater / Reação de acessos de meloeiro a Myrothecium roridum e herança da resistência a podridão-de-cratera
Many problems occur in melon farming, among them, the rot-of-crater, caused by the fungus Myrothecium roridum. The genetic resistance is one of the alternatives of control that combined with other practices can reduce the effect of this disease. To achieve cultivars with resistance is necessary to identify the sources of resistance and obtain information on
Publicado em: 2008
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11. Influência do ângulo de posição sobre o fresamento frontal de níquel puro com insertos de metal duro
Nickel is considered as a dificult-to-cut material, due to rapidly work hardening when machined. Because it shows high strength at high temperatures it is widely used as high temperature alloys in aerospacial components and more specifically is applied in the continuous casting industry, in molds which consist of a copper sheet with pure nickel electroplated
Publicado em: 2008
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12. Gephysical Characterization of the Araguainha impact structure, MT/GO. / Caracterização geofísica da estrutura de impacto de Araguainha, MT/GO
Araguainha is the largest and the best-exposed complex crater of South America, formed in horizontal sediments of the Paraná Basin. Its portentous structure with 40 km in diameter and 25 km of transient cavity reveals a negative contrast of density and magnetic susceptibility in the central uplift. That feature allows to infer a limit of physical property b
Publicado em: 2007