45,054 research outputs found
Two-Higgs-Doublet-Models and Radiative CP Violation
We discuss the feasibility of spontaneous CP violation being induced by
radiative corrections in 2HDM's. Specifically, we analyze the cases of
gaugino/higgsino effect on MSSM, and a new model with an extra exotic quark
doublet. The new model, while demonstrating well the Georgi-Pais theorem, is
also expected to be phenomenlogically interesting.Comment: 8 pages + cover, 3 figures incoporated, in latex with aipproc.sty
/aipproc.cls, talk given by O.K. at MRST '9
Optimization of Dimples in Microchannel Heat Sink with Impinging Jets—Part B: the Influences of Dimple Height and Arrangement
The combination of a microchannel heat sink with impinging jets and dimples (MHSIJD) can effectively improve the flow and heat transfer performance on the cooling surface of electronic devices with very high heat fluxes. Based on the previous work by analysing the effect of dimple radius on the overall performance of MHSIJD, the effects of dimple height and arrangement were numerically analysed. The velocity distribution, pressure drop, and thermal performance of MHSIJD under various dimple heights and arrangements were presented. The results showed that: MHSIJD with higher dimples had better overall performance with dimple radius being fixed; creating a mismatch between the impinging hole and dimple can solve the issue caused by the drift phenomenon; the mismatch between the impinging hole and dimple did not exhibit better overall performance than a well-matched design
The topological system with a twisting edge band: position-dependent Hall resistance
We study a topological system with one twisting edge-state band and
one normal edge-state band. For the twisting edge-state band, Fermi energy goes
through the band three times, thus, having three edge states on one side of the
sample; while the normal edge band contributes only one edge state on the other
side of the sample. In such a system, we show that it consists of both
topologically protected and unprotected edge states, and as a consequence, its
Hall resistance depends on the location where the Hall measurement is done even
for a translationally invariant system. This unique property is absent in a
normal topological insulator
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A review of microgrid development in the United States – A decade of progress on policies, demonstrations, controls, and software tools
Microgrids have become increasingly popular in the United States. Supported by favorable federal and local policies, microgrid projects can provide greater energy stability and resilience within a project site or community. This paper reviews major federal, state, and utility-level policies driving microgrid development in the United States. Representative U.S. demonstration projects are selected and their technical characteristics and non-technical features are introduced. The paper discusses trends in the technology development of microgrid systems as well as microgrid control methods and interactions within the electricity market. Software tools for microgrid design, planning, and performance analysis are illustrated with each tool's core capability. Finally, the paper summarizes the successes and lessons learned during the recent expansion of the U.S. microgrid industry that may serve as a reference for other countries developing their own microgrid industries
Time-dependent universal conductance fluctuations in mesoscopic Au wires: implications
In cold, mesoscopic conductors, two-level fluctuators lead to time-dependent
universal conductance fluctuations (TDUCF) manifested as noise. In Au
nanowires, we measure the magnetic field dependence of TDUCF, weak localization
(WL), and magnetic field-driven (MF) UCF before and after treatments that alter
magnetic scattering and passivate surface fluctuators. Inconsistencies between
and strongly suggest either that the
theory of these mesoscopic phenomena in weakly disordered, highly pure Au is
incomplete, or that the assumption that the TDUCF frequency dependence remains
to very high frequencies is incorrect. In the latter case, TDUCF in
excess of expectations may have implications for decoherence in
solid-state qubits.Comment: 8 pages, 9 figures, accepted to PR
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