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The zigzag product was introduced by Reingold, Vadhan & Wigderson (2000). When the zig-zag product was first introduced, it was used for the explicit construction of constant degree expanders and extractors. Later on, the zig-zag product was used in computational complexity theory to prove that symmetric logspace and logspace are equal ...
Each phase, therefore, couples with each other phase, and the voltages cancel out. As such, there would be negligible current through the neutral point, as the Zig-Zag has a high positive and negative sequence impedance, with a low zero-sequence impedance which can be tied to ground. [4] Each of the three "limbs" are split into two sections.
Salil Vadhan is an American computer scientist. He is Vicky Joseph Professor of Computer Science and Applied Mathematics at Harvard University. [1] After completing his undergraduate degree in Mathematics and Computer Science at Harvard in 1995, he obtained his PhD in Applied Mathematics from Massachusetts Institute of Technology in 1999, where his advisor was Shafi Goldwasser. [2]
Therefore, a zig-zag product can also be used to construct families of expander graphs. If G is a ( n , d , λ 1 ) -graph and H is an ( m , d , λ 2 ) -graph, then the zig-zag product G H is a ( nm , d 2 , φ ( λ 1 , λ 2 )) -graph where φ has the following properties.
The M210 follows a zig-zag route for effective cleaning, so you don't have to worry about spots getting missed. At under 3 inches tall, this baby can effortlessly cruise under end tables and sofas ...
A special form of auto transformer called a zig zag is used to provide grounding on three-phase systems that otherwise have no connection to ground. A zig-zag transformer provides a path for current that is common to all three phases (so-called zero sequence current).
1963: Easy-Bake Oven. The cooking game changed in 1963 when kids had the power to make baked goods of their own. The mini oven comes with cake mix packets and tiny round pans that, together, make ...
Earthing transformer with a zig-zag. Grounding transformers most commonly incorporate a single winding transformer with a zigzag winding configuration, but may also be created with a (rare case) delta-wye transformer. [2] [4] Neutral grounding transformers are very common on generators in power plants and wind farms. [2]