نتایج جستجو برای: paraboloid surface
تعداد نتایج: 635628 فیلتر نتایج به سال:
Photoelectron Momentum Microscopy Mapping of the Electronic Bandstructure Within Minutes The electronic band structure of solids is readily described in reciprocal space (k-space). Owing to the translational symmetry of crystalline solids, the electronic structure can be reduced to the first Brillouin zone, which contains the full information on all electronic bands. Experimental band mapping v...
We prove that the pleated hyperbolic paraboloid, a familiar origami model known since 1927, in fact cannot be folded with the standard crease pattern in the standard mathematical model of zero-thickness paper. In contrast, we show that the model can be folded with additional creases, suggesting that real paper “folds” into this model via small such creases. We conjecture that the circular versi...
Accurate knowledge of Mercury's magnetospheric magnetic field is required to understand the sources of the planet's internal field. We present the first model of Mercury's magnetospheric magnetic field confined within a magnetopause shape derived from Magnetometer observations by the MErcury Surface, Space ENvironment, GEochemistry, and Ranging spacecraft. The field of internal origin is approx...
Starting from the Maxwell-Bloch equations for a 3D ring-cavity laser, we analyze stability of the nonlasing state and demonstrate that, at the instability threshold, the wave vectors of the critical perturbations belong to a paraboloid in the 3D space. Next, we derive a system of nonlinear evolution equations above the threshold. The nonlinearity in these equations is cubic. For certain sets of...
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