Lie导数(Lie derivative) \mathcal{L}_X:\bigwedge^kM\to \bigwedge^k M 满足 \mathcal{L}_X(\varphi \wedge \psi)=(\mathcal{L}_X \varphi)\wedge \psi+\varphi \wedge (\mathcal{L}_X \psi) 外微分(exterior derivative) d:\bigwedge^kM\to \bigwedge^{k+1}M 满足 ...
A wedge resection is a surgery in which a surgeon takes out a wedge-shaped piece of tissue so as to remove cancerous growth and...
gnomonic projection, this time with respect to the centre of the spherical wedge, which maps the random spherical polytope we consider to a random polytope defined in an bi-infinite strip in the Euclidean space, where the width of the strip is determined by the angle of the spherical wedge....
The problems of wave diffraction by a plane angular screen occupying an infinite 45 degree wedge sector with Dirichlet and/or Neumann boundary conditions are studied in Bessel potential spaces. Existence and uniqueness results are proved in such a framework. The solutions are provided for the spaces...
W2 物理楔形板放置精度 (Physical wedge placement accuracy) 月检: 检查楔形板、托盘和加速器机头的固定是否牢靠,安装至机头的位置的可重复性和精度。 容许偏差:1 mm。 W3 60° 电子楔形板的 profile,所有能量 (Wedge profile for 60-degree electronic wedges, all energies) ...
Wedge pillows are triangular orthopedic pillows made to help you sleep deeper and minimize symptoms ofsleep apnea, acid reflux, and congestion. High-quality wedge pillows are typically made from firm memory foam or polyurethane foam and form a slight angle to elevate the head, but they can also...
The Lewis engine was built to accommodate growth of boundary layers and placed a 17-degree wedge ramp upstream of the inlet. Three flowpaths were mounted side by side, but only the center duct was fueled; the others were “dummies” that gave data on unfueled operation for comparison. The...
Compact optical 90° hybrid based on a wedge-shaped 2 x 4 MMI coupler and a 2 x 2 MMI coupler on a thin-film lithium niobate platform Exp., vol. 21, pp. 28423-28431, 2013.Ultra-compact optical 90°hybrid based on a wedge-shaped 2×4 MMI coupler and a 2×2 MMI coupler in silic...
Most gap wedges have a loft of between 50 and 52 degrees. Among wedges, this club has a low to moderate degree of loft and is sometimes called an approach wedge, used for approach shots more than any other type of wedge shots.
Sturdy tools were used to wedge into a dorsal slot on the fruit stone and fine tools were used in a vertical manner to pierce an outer coating encapsulating the seedling inside the stone. Medium tools were used in both a vertical and a horizontal manner to lever out the seed matter. The...