q=\frac{1}{2 \pi} \oint_{C} d \mathbf{k} \cdot \nabla_{\mathbf{k}} \phi(\mathbf{k}), \quad q \in \mathbb{Z}\\ 其中C 是绕BIC的逆时针回路, \phi 是偏振与 x 方向的夹角。那么以上图的BIC为例,其拓扑荷即为-1。当两个/多个BIC相遇时,我们画个大回路把它们都括起来,那么慢慢...
Reality Check: Last February, China issued joint statements with a number of leaders attending the opening ceremony of the Beijing Winter Olympics. The U.S.'s interpretation of the China-Russia joint statement is out of context and part of a smear campaign. ◆During the Beijing Winter Olympics...
we would like to extend their approach to handle cubic curves as well. This is significantly more complicated than the quadratic case, because of the procedural texture-coordinate-assignment phase. However, it should be possible to do this entirely on the GPU using DirectX 10-class hardware ...
What is the origin of the oxygen we breathe, the hydrogen and oxygen (in form of water H2O) in rivers and oceans, the carbon in all organic compounds, the silicon in electronic hardware, the calcium in our bones, the iron in steel, silver and gold in jewels, the rare earths utilized,...
Of course, pricey headphones don't all have to be over-ear models. These in-ears from Astell & Kern will set you back a cool $3299 (£2700). There are 12 drivers per earpiece: quad low, quad mid and quad high proprietary balanced armatures. Housing each 12-driver configuration is a...
In this article I propose a new criterion to extend the Standard Model of particle physics from a straightforward algebraic conjecture: the symmetries of physical microscopic forces originate from the automorphism groups of main Cayley–Dickson algebras,
that the fluid always has zero divergence. The dot product in the divergence operator results in a sum of partial derivatives (rather than a vector, as with the gradient operator). This means that the divergence operator can be applied only to a vector field, such as the velocity,...
J. E. S. U. S. IN NADOYAH. Chananyah. Ahmen OF GOD, The Father God the Son God the Holy Spirit. YES CHAYA HETH RACHMYEL AYSCHER. The Innocent, holy blood of Jesus Christ, the Son of God, cleanses us from all sin and give you spirits of eternal rest and peace through Jesum...
The Fourier algebra of the affine group of the real line has a natural identification, as a Banach space, with the space of trace-class operators on $$L^2(
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