Shape memory composites(SMCs)combine mechanical performances of composite materials with functional behavior of shape memory polymers.They can be used to produce the external frame of self-deployable solar sails with ...Shape memory composites(SMCs)combine mechanical performances of composite materials with functional behavior of shape memory polymers.They can be used to produce the external frame of self-deployable solar sails with very low weight in comparison with traditional composite booms.Furthermore,heat activation is necessary for deploying instead of complex mechanical devices.In this study,the mechanical behavior of a solar sail with SMC frame is simulated by means of finite element modeling.Design considerations are made on sail deployment configuration,size/weight ratio of solar sails,and SMC properties.An experimental activity has been also performed to provide suitable candidates for the composite laminates of the SMC structure.Mechanical and instrumented recovery tests have been carried out on 2-plies carbon-fiber laminates with a shape memory interlayer.展开更多
String theory and quantum loop gravity have given us a lot of hope and have achieved some success in trying to build a quantum theory of gravity. However, we still don’t have definitive answers. In this paper, we sub...String theory and quantum loop gravity have given us a lot of hope and have achieved some success in trying to build a quantum theory of gravity. However, we still don’t have definitive answers. In this paper, we substantiate the idea of the existence of a Primary Parent Particle, constituents of the medium of primary matter before the Big Bang and describe its structure, consisting of three Beginnings united in the form of Borromeo rings. We derived a generalization of the Bohr-Sommerfeld quantization rules on the multidimensional case and considered problems of the embedding spaces into the each other based on the Nash theorems. Assuming that at the distances occupied by the triad we can consider the space Euclidean flat, we introduce quantum mechanical equations describing them. The problems of constructing the theory of quantum gravity and Dark matter radiation are considered separately. As part of our approach, we describe the acceleration of the Universe created by Dark Energy during expansion. We criticize principle of dualism, which can be used only for linear theories, but is not applicable to nonlinear theories. We investigated various distributions of dark matter densities and the gravitational potentials induced by them in galaxies and velocities for rotation curves. The main goal in the article was to show self-deployment of the Universe and its origin before Big Bang.展开更多
文摘Shape memory composites(SMCs)combine mechanical performances of composite materials with functional behavior of shape memory polymers.They can be used to produce the external frame of self-deployable solar sails with very low weight in comparison with traditional composite booms.Furthermore,heat activation is necessary for deploying instead of complex mechanical devices.In this study,the mechanical behavior of a solar sail with SMC frame is simulated by means of finite element modeling.Design considerations are made on sail deployment configuration,size/weight ratio of solar sails,and SMC properties.An experimental activity has been also performed to provide suitable candidates for the composite laminates of the SMC structure.Mechanical and instrumented recovery tests have been carried out on 2-plies carbon-fiber laminates with a shape memory interlayer.
文摘String theory and quantum loop gravity have given us a lot of hope and have achieved some success in trying to build a quantum theory of gravity. However, we still don’t have definitive answers. In this paper, we substantiate the idea of the existence of a Primary Parent Particle, constituents of the medium of primary matter before the Big Bang and describe its structure, consisting of three Beginnings united in the form of Borromeo rings. We derived a generalization of the Bohr-Sommerfeld quantization rules on the multidimensional case and considered problems of the embedding spaces into the each other based on the Nash theorems. Assuming that at the distances occupied by the triad we can consider the space Euclidean flat, we introduce quantum mechanical equations describing them. The problems of constructing the theory of quantum gravity and Dark matter radiation are considered separately. As part of our approach, we describe the acceleration of the Universe created by Dark Energy during expansion. We criticize principle of dualism, which can be used only for linear theories, but is not applicable to nonlinear theories. We investigated various distributions of dark matter densities and the gravitational potentials induced by them in galaxies and velocities for rotation curves. The main goal in the article was to show self-deployment of the Universe and its origin before Big Bang.
