4,080 research outputs found
mixing within minimal flavor-violating two-Higgs-doublet models
In the "Higgs basis" for a generic 2HDM, only one scalar doublet gets a
nonzero vacuum expectation value and, under the criterion of minimal flavor
violation, the other one is fixed to be either color-singlet or color-octet,
which are named as the type-III and type-C models, respectively. In this paper,
the charged-Higgs effects of these two models on mixing are
studied. Firstly, we perform a complete one-loop computation of the
electro-weak corrections to the amplitudes of mixing.
Together with the up-to-date experimental measurements, a detailed
phenomenological analysis is then performed in the cases of both real and
complex Yukawa couplings of charged scalars to quarks. The spaces of model
parameters allowed by the current experimental data on
mixing are obtained and the differences between type-III and type-C models are
investigated, which is helpful to distinguish between these two models.Comment: 19 pages, 3 figures, 2 tables; More references and discussions added,
final version published in the journa
Dynamic Properties of Saturated Coal Fly Ash
The great part of fly ash produced by thermal power plants is either sluiced or filled in disposal areas in China. The dynamic properties of fly ash are important for solving geotechnical problems relating to fly ash mass under dynamic loadings. The high temperature during combustion makes fly ash nonplastic but pozzolanic. The nonplasticity causes the dynamic properties of sluiced and just compacted fly ash to be similar to ones of silts. The pozzolanic action causes obvious aging effect for compacted fly ash, by which an aging time of 180 days may increase maximum shear modulus by 75% to 400% and cyclic strength by 100% to 500%. All of these results are reported and discussed in the paper in detail. Based on the results four correlative equations are presented which could be used to preliminarily evaluate the dynamic properties of fly ashes
Inclusive weak-annihilation decays and lifetimes of beauty-charmed baryons
Imbalanced beauty-charmed baryons are of great
significance to the development of heavy flavor physics. In this work, we study
the inclusive weak-annihilation decays of and their
contributions to the lifetimes. For the calculation of the
inclusive decay width where stands for the
sum of the final states with charm number +1 and strange number -1, we work in
the heavy diquark effective theory which provides us with a convenient
technical tool to construct the operator product expansion. The
is considered to be a superposition of two states with one
containing a spin-0 diquark and the other one containing a spin-1
diquark. It is found that both the lifetimes and the
branching ratios are very sensitive to the spin
in . As has a longer lifetime than
and bigger branching ratios of similar decay channels, the exclusive decays
, ,
, and are more
promising for experimental searches of at the LHC comparing
with exclusive decay .Comment: 7 pages, 4 figure
Experimental investigations on core drilling by ultrasonic-vibration-assisted grinding for hard-to-machine materials - A review
Citation: Qin, N., Lei, J., & Pei, Z. J. (2016). Experimental investigations on core drilling by ultrasonic-vibration-assisted grinding for hard-to-machine materials - A review. International Journal of Manufacturing Research, 11(1), 28-52. doi:10.1504/IJMR.2016.076976Ultrasonic-vibration-assisted grinding (UVAG), a hybrid machining process combining material removal mechanisms of diamond grinding and ultrasonic machining, has been used to machine various hard-to-machine materials. Large amount of research work on UVAG has been carried out since it is invented. However there are few review papers to cover the current literature on UVAG. The emphasis of this literature review is the experimental investigations of the drilling process with ultrasonic vibration using a core drill with metal-bonded diamond abrasives. Experimental results are summarised and compared. The inconsistent results and their reasons are discussed. Furthermore, directions of future research on UVAG are also presented. Β© 2016 Inderscience Enterprises Ltd
Optimization of microsatellite DNA Gelred fluorescence imaging technology
Gelred fluorescent dye has broader prospects of application in DNA experiment because of its high sensitivity, security and stability. In order to explore the best microsatellite DNA Gelred imaging technology, this study compared its dosage by using three methods; precasting gels method (PG), staining sample method (SS) and immersion gels method (IG). The results show that agarose gel electrophoresis (AGE) fluorescence imaging technology can use the first method (PG) and the concentration of Gelred was 1X, because of the best banding and easy operation. The polyacrylamide gel electrophoresis (PAGE) can use the third method (IG), for the advantages of clear and bright image, saving dye and easily redying to image. The orthogonal test showed that the parameters of IG method were: the concentration of Gelred was 2X, that of sodium chloride was 10% and immersion time was 40 min. The optimization of microsatellite DNA Gelred fluorescence imaging technology would lay a technical foundation in DNA banding related experiments.Key word: Agarose gel electrophoresis (AGE), polyacrylamide gel electrophoresis (PAGE), fluorescence imaging technology of Gelred, simple sequence repeat (SSR)
- β¦