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Keep in mind that the etched material is hydrophobic because of entrapped air in the etchings therefore, the water doesn't touch most of the surface. This means that when submersed, it will eventually loose it's hydrophobic properties as the air dissipates into the water. The submarine would also have the problem of increasing water pressure with depth ...


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We take into account the inelastic interactions that take place between the respective type of particle and the material, i.e. interaction that can consume part of the energy of the radiation particle, and calculate the mean-free path of the respective type of particle in the material. In this calculus we also consider the density and the structure of the ...


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There are two questions.. 1. What is the concept of magnetic monopole here? 2. Why Maxwell's eqns remain unmodified? They are not elementary particles as anticipated by P.M.Dirac. But the concept comes from the non-zero divergence of magnetization field. In electrostatics when you have $\nabla\cdot \mathbf{P}$ (polarization vector) not equal to zero, you ...


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It is an edge dislocation. Compare: to: TEM tracks dislocations in graphene Notice that the yellow loops have 5 and 7 edges, respectively, compared to the usual six.


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Here's a quick and dirty approximation based on some values reported in Wikipedia: Wikipedia lists the ultimate tensile strength of a carbon nanotube as 63,000 MPa, but in a footnote proposes a "theoretical limit of 300 GPa" for multi-walled nanotubes. Wikipedia also mentions "most single-walled nanotubes (SWNTs) have a diameter of close to 1 nanometer." ...


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Hypothesis: Considering transverse stress and strain, the hexagonal unit completely tiles the space within the structure without gaps and combined with this property, comes closest to a emulating a circle which most symmetrically distributes stress and load.


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The Poisson ratio gives you the relationship between these different moduli. For example, bulk modulus $K$ is given by (see reference) $$K = \frac{E}{3(1-2\sigma)} \tag1$$ and shear modulus $$ G = \frac{E}{2(1+\sigma)} \tag2$$ If you see a certain ordering of the three, you can deduce the value of the Poisson ratio. So if you find $$K < E < G$$ ...



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