sexta-feira, 30 de setembro de 2011
sábado, 24 de setembro de 2011
quarta-feira, 21 de setembro de 2011
segunda-feira, 19 de setembro de 2011
domingo, 11 de setembro de 2011
Computador biológico destrói células de câncer
Computador biológico destrói células de câncer: Ao encontrar as células, o computador biológico dispara o mecanismo de autodestruição das células, a chamada apoptose, destruindo o tumor.
quinta-feira, 8 de setembro de 2011
‘Breakthrough’ Technique for Yield-Strength Testing
From American Machinist
Nanovea, a developer of mechanical testing and coordinated measuring systems, introduced a patent-pending method for measuring yield strength through indentation. It calls the Nanovea Mechanical Tester a “breakthrough” that will ultimately replace traditional tensile testing machines.
The yield strength (or “yield point”) of a material is determined by identifying the stress point at which plastic deformation begins. Before reaching the yield point a material will deform elastically, but it returns to its original shape when stress is removed. It is a critical data element for understanding properties of advanced materials in industries like biomedical, microelectronics, and energy, among others.
Typically, yield strength is determined using a tensile testing machine, a large instrument that requires high strength to pull apart metal, plastic, or other materials. In addition to the capital investment in the machine, the process consumes a lot of material, and involves a lot of effort, including sample preparation. Even so, it may be impossible to test yield strength on small samples and localized areas.
Yield strength data is easy to determine usingNanovea’s Mechanical Tester in indentation mode, with a cylindrical flat tip. The indentation test has been used for hardness and elastic modulus measurements, but it has been difficult to link macro tensile properties to what was measured during an indentation test. Many studies measuring with spherical tips have allowed stress-strain curves, but these never have been able to give reliable tensile yield strength data that corresponds directly to macro tensile data.
The Nanovea method, using a cylindrical flat tip, returns a yield-strength directly comparable to what is measured by traditional means. The assumption is that the load per surface area at which the cylindrical flat tip penetrates, at increased speed, is directly linked to the load versus surface area at which the material starts flowing in a tensile mode test. Therefore, reliable yield-strength results can be never gathered on numerous materials for which it has never before been obtainable.
"This is just another addition, on a long and growing list, to what can be tested with our mechanical tester," according to Nanovea CEO Pierre Leroux. While this specific test is a breakthrough of great importance, it is also evidence that the Nanovea Mechanical Tester has the widest testing capability of any mechanical testing system.
Nanovea, a developer of mechanical testing and coordinated measuring systems, introduced a patent-pending method for measuring yield strength through indentation. It calls the Nanovea Mechanical Tester a “breakthrough” that will ultimately replace traditional tensile testing machines.
The yield strength (or “yield point”) of a material is determined by identifying the stress point at which plastic deformation begins. Before reaching the yield point a material will deform elastically, but it returns to its original shape when stress is removed. It is a critical data element for understanding properties of advanced materials in industries like biomedical, microelectronics, and energy, among others.
Typically, yield strength is determined using a tensile testing machine, a large instrument that requires high strength to pull apart metal, plastic, or other materials. In addition to the capital investment in the machine, the process consumes a lot of material, and involves a lot of effort, including sample preparation. Even so, it may be impossible to test yield strength on small samples and localized areas.
Yield strength data is easy to determine using
The Nanovea method, using a cylindrical flat tip, returns a yield-strength directly comparable to what is measured by traditional means. The assumption is that the load per surface area at which the cylindrical flat tip penetrates, at increased speed, is directly linked to the load versus surface area at which the material starts flowing in a tensile mode test. Therefore, reliable yield-strength results can be never gathered on numerous materials for which it has never before been obtainable.
"This is just another addition, on a long and growing list, to what can be tested with our mechanical tester," according to Nanovea CEO Pierre Leroux. While this specific test is a breakthrough of great importance, it is also evidence that the Nanovea Mechanical Tester has the widest testing capability of any mechanical testing system.
segunda-feira, 5 de setembro de 2011
Menor motor molecular elétrico tem apenas uma molécula
Menor motor molecular elétrico tem apenas uma molécula: O desenvolvimento faz parte de uma nova classe de dispositivos que poderão ser usados em aplicações que vão da medicina à engenharia.
Special report highlights 'greatest hits' of scientific supercomputing
<p><a href="http://www.physorg.com/news/2011-09-special-highlights-greatest-scientific-supercomputing.html%22%3ESpecial report highlights 'greatest hits' of scientific supercomputing</a></p>
<p>In 2007, a report that concluded that the Earth was warming, probably as a result of human activities, resulted in a share of the Nobel Peace Prize. The United Nations Intergovernmental Panel on Climate Change's next assessment, expected in 2014, once again includes simulation data generated from DOE leadership supercomputers, this time at Oak Ridge and Argonne national laboratories. Next a team of researchers, led by Warren Washington of the National Center for Atmospheric Research, will use a 2011 allocation of 110 million processor hours at Argonne and Oak Ridge to begin the generation of the largest treasure trove of climate data to date.</p>
<p>In 2007, a report that concluded that the Earth was warming, probably as a result of human activities, resulted in a share of the Nobel Peace Prize. The United Nations Intergovernmental Panel on Climate Change's next assessment, expected in 2014, once again includes simulation data generated from DOE leadership supercomputers, this time at Oak Ridge and Argonne national laboratories. Next a team of researchers, led by Warren Washington of the National Center for Atmospheric Research, will use a 2011 allocation of 110 million processor hours at Argonne and Oak Ridge to begin the generation of the largest treasure trove of climate data to date.</p>
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