Recall that an effective circle action is semifree if the stabilizer subgroup of each point is connected. We show that if (M,ω) is a coadjoint orbit of a compact Lie group G then every element of π1(G) may be represented by a semifree S-action. A theorem of McDuff– Slimowitz then implies that π1(G) injects into π1(Ham(M,ω)), which answers a question raised by Weinstein. We also show that a circ...

Finite element simulations have been conducted to determine the temperature distribution (both in radial and axial direction), heat and electric flux-field in the powder compact/die/punch assembly during the spark plasma sintering (SPS) process. A thermal–electrical coupled model with temperature dependent thermal and electrical properties is implemented. The simulation studies were conducted u...

the compact finite difference schemes have been found to give simple ways of reaching the objectives of high accuracy and low computational cost. during the past two decades, the compact schemes have been used extensively for numerical simulation of various fluid dynamics problems. these methods have also been applied for numerical solution of some prototype geophysical fluid dynamics problems ...

axial flux permanent magnet (afpm) machines are attractive candidates for electric vehicles (evs) applications due to their axial compact structure, high efficiency, high power and torque density. this paper presents general design characteristics of afpm machines. moreover, torque density of the machine which is selected as main objective function, is enhanced by using genetic algorithm (ga) a...

The set of all transformation monoids on a fixed set of infinite cardinality λ, equipped with the order of inclusion, forms a complete algebraic lattice Mon(λ) with 2 compact elements. We show that this lattice is universal with respect to closed sublattices, i.e., the closed sublattices of Mon(λ) are, up to isomorphism, precisely the complete algebraic lattices with at most 2 compact elements....

The design and experimental results of a 5-, 10and 23-pole lumped-element HTS bandpass filters for the applications in digital terrestrial television and other digital communication services is reported here. These filters are designed around 800 MHz centre frequency, 7.6 MHz bandwidth using end-coupled lumped element resonators on yttrium-barium-copper-oxide (YBCO) or thallium-barium-calcium-c...

In a compact multiple-input-multiple-output (MIMO) communication systems, the channel capacity of a traditional 4-element uniform linear array (ULA) will decrease rapidly with the increment of the mean angle of arrival (AoA) of the incident waves. We will show first in this paper that this channel capacity decrement is caused by the antenna radiation pattern distortion, which owes to the so-cal...