We obtained the energy transport velocity distribution for a three dimensional ideal cloak explicitly. Near the operation frequency, the energy transport velocity has rather peculiar distribution. The velocity along a line joining the origin of the cloak is a constant, while the velocity approaches zero at the inner boundary of the cloak. A ray pointing right into the origin of the cloak will experience abrupt changes of velocities when it impinges on the inner surface of the cloak. This peculiar distribution causes long time delays for beams passing through the ideal cloak within a geometric optics description.
標簽： distribution dimensional transport obtained
上傳時間： 2013-12-19
上傳用戶：zhliu007
This program incorporates the FV method for solving the Navier-Stokes equations using 2D, Cartesian grids and the staggered arrangement of variables. Variables are stored as 2D arrays. SIMPLE method is used for pressure calculation. UDS and CDS are implemented for the discretization of convective terms, CDS is used for the diffusive terms. The boundary conditions are set for the lid-driven cavity flow. Only steady flows are considered.
標簽： Navier-Stokes incorporates Cartesian equations
上傳時間： 2017-05-14
上傳用戶：ryb
The 2D CFD Program NaSt2D The program is a 2D solver for the incompressible, transient Navier-Stokes equations including the temperature equation and free boundary problems. It uses finite differences for discretization on a structured equidistant staggered grid, central and upwind (donor-cell) discretization of the convective parts and an explicit time stepping scheme. The free boundary value problems are treated with the MAC technique.
標簽： incompressible Navier-Sto The transient
上傳時間： 2013-11-30
上傳用戶：xfbs821
Solves the incompressible Navier-Stokes equations in a rectangular domain with prescribed velocities along the boundary. The standard setup solves a lid driven cavity problem.
標簽： incompressible Navier-Stokes rectangular prescribed
上傳時間： 2013-11-25
上傳用戶：15736969615
迷宮算法（maze） /* Maze * Starting point is m[0][0], need to find a path go to m[9][9]. 0 means OK, * 1 means cannot go there, boundary is 0 and 9, cannot go beyond boundary. * Each step can be made horizontally or vertically for one more grid (diagonal * jump is not allowed). * Your program should print a series of grid coordinates that start from m[0][0] * and go to m[9][9] * Hint: No need to find the shortest path, only need to find one path that gets * you to desitination. */
上傳時間： 2013-12-27
上傳用戶：Divine
matlab有限元網格劃分程序 DistMesh is a simple MATLAB code for generation of unstructured triangular and tetrahedral meshes. It was developed by Per-Olof Persson (now at UC Berkeley) and Gilbert Strang in the Department of Mathematics at MIT. A detailed description of the program is provided in our SIAM Review paper, see documentation below. One reason that the code is short and simple is that the geometries are specified by Signed Distance Functions. These give the shortest distance from any point in space to the boundary of the domain. The sign is negative inside the region and positive outside. A simple example is the unit circle in 2-D, which has the distance function d=r-1, where r is the distance from the origin. For more complicated geometries the distance function can be computed by interpolation between values on a grid, a common representation for level set methods. For the actual mesh generation, DistMesh uses the Delaunay triangulation routine in MATLAB and tries to optimize the node locations by a force-based smoothing procedure. The topology is regularly updated by Delaunay. The boundary points are only allowed to move tangentially to the boundary by projections using the distance function. This iterative procedure typically results in very well-shaped meshes. Our aim with this code is simplicity, so that everyone can understand the code and modify it according to their needs. The code is not entirely robust (that is, it might not terminate and return a well-shaped mesh), and it is relatively slow. However, our current research shows that these issues can be resolved in an optimized C++ code, and we believe our simple MATLAB code is important for demonstration of the underlying principles. To use the code, simply download it from below and run it from MATLAB. For a quick demonstration, type "meshdemo2d" or "meshdemond". For more details see the documentation.
標簽： matlab有限元網格劃分程序
上傳時間： 2015-08-12
上傳用戶：凜風拂衣袖
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標簽： 源代碼
上傳時間： 2017-11-17
上傳用戶：wendingchang
可測試性設計（Design-For-Testability，DFT）已經成為芯片設計中不可或缺的重要組成部分。它通過在芯片的邏輯設計中加入測試邏輯提高芯片的可測試性。在高性能通用 CPU 的設計中，可測試性設計技術得到了廣泛的應用。本文結合幾款流行的 CPU，綜述了可應用于通用 CPU 等高性能芯片設計中的各種可測試性方法，包括掃描設計（Scan Design），內建自測試（Built-In Self-Test，BIST），測試點插入（Test Point Insertion），與 IEEE 1149.1標準兼容的邊界掃描設計（boundary Scan Design，BSD）等技術。
上傳時間： 2021-10-15
上傳用戶：
ABSTRACTThe flyback power stage is a popular choice for single and multiple output dc-to-dc converters at powerlevels of 150 Watts or less. Without the output inductor required in buck derived topologies, such as theforward or push-pull converter, the component count and cost are reduced. This application note will reviewthe design procedure for the power stage and control electronics of a flyback converter. In these isolatedconverters, the error signal from the secondary still needs to cross the isolation boundary to achieveregulation. By using the UC3965 Precision Reference with Low Offset Error Amplifier on the secondaryside to drive an optocoupler and the UCC3809 Economy Primary Side Controller on the primary side, asimple and low cost 50 Watt isolated power supply is realized.
標簽： 隔離
上傳時間： 2021-11-24
上傳用戶：kingwide
結構體的具體尺寸如下所示：a=1.20h=0.620其中介質錐的介電常數E=2.0。選定工作頻率為f=15GHz相對應的真空中的波長為0=20mm，這樣結構體的兒何尺寸己經完全確定，下面介紹求解的全過程選定求解方式為（Solution Type）Driven modal1.建立所求結構體的幾何模型（單位：mm）。由于此結構體的幾何形狀較簡單，使用工具欄中的Draw命令可直接畫出，這里不再贅述述。畫出的結構體如圖4.1.2所示。2.充結構體的材料選定結構體中的錐體部分，添加其介電常數Er=20的介質材料注：如果HSS中沒有提供與所需參數完全相同的材料，用戶可以通過新建材料或修改已有材料，使其參數滿足用戶需求設定結構體的邊界條件及其激勵源a.選定結構體的貼片部分，設定其為理想導體（PerE）。b.畫出尺寸為X×Y×Z=70mm×70mm×40mm的長方體作為輻射邊界，并設定其邊界條件為輻射邊界條件（Radiation boundary）。c.由于要求出結構體的RCS，因此設定激勵源為平面入射波（Incident Wave Source）。如圖4.1.3所示。4.設定求解細節，檢驗并求解a.設定求解過程的工作頻率為f=15GHz.其余細節設定如圖4.1.4所示。b.設定遠區輻射場的求解（Far Field Radiation Sphere欄的設定）。c.使用 Validation check命令進行檢驗，無錯誤發生，下一步運行命令 Analyze，對柱錐結構體進行求解。如圖4.1.5和4.1.6所示。
上傳時間： 2022-03-10
上傳用戶：
