排序方式: 共有26条查询结果,搜索用时 31 毫秒
1.
Chen Chong Ma Wen-Gan Zhang Ren-You Zhang Yu Chen Liang-Wen Guo Lei 《The European Physical Journal C - Particles and Fields》2014,74(11):1-10
We consider holographic superconductors in a rotating black string spacetime. In view of the mandatory introduction of the \(A_\varphi \) component of the vector potential we are left with three equations to be solved. Their solutions show that the rotation parameter \(a\) influences the critical temperature \(T_\mathrm{c}\) and the conductivity \(\sigma \) in a simple but non-trivial way. 相似文献
2.
We investigate the lepton flavor violation processes pp→eμX induced by R-parity violating interactions at the
Tevatron hadron collider. The theoretical calculation and Monte
Carlo simulation demonstrate that with a set of suitable cuts on
experimental observables, one might be capable to reduce the
standard model physical background to a controllable level so that
the signals of R-parity violating interactions could be detected
distinctively. Furthermore, clear sneutrino information can be
abstracted from the purified event sample where other SUSY scalar
quark ``pollution' is heavily suppressed. We conclude that with a
reasonable assumption of 10 fb-1 integrated luminosity, the
experiments at the Tevatron machine would have potential to
discover sneutrino in the region of
m_{\tilde{ν}}≤400 GeV via
lepton flavor violation eμ production channels, or extend the
mass scale constraint up to m_{\tilde{ν}}≥ 550 GeV at 95% CL. 相似文献
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We present the NLO electroweak radiative corrections to the \begin{document}$ e^+e^-\gamma $\end{document} ![]()
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production in γγ collision, which is an ideal channel for calibrating the beam luminosity of a Photon Linear Collider. We analyze the dependence of the total cross section on the beam colliding energy, and then investigate the kinematic distributions of final particles at various initial photon beam polarizations at EW NLO accuracy. The numerical results indicate that the EW relative corrections to the total cross section are non-negligible and become increasingly significant as the increase of the beam colliding energy, even can exceed –10% in the \begin{document}${{J}} = 2$\end{document} ![]()
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γγ collision at \begin{document}$ \sqrt{\hat{s}} = 1\; {\rm{TeV}} $\end{document} ![]()
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. Such EW corrections are very important and should be taken into consideration in precision theoretical and experimental studies at high-energy γγ colliders. 相似文献
5.
Antioxidant capacities and total phenolic contents of 56 wild fruits from South China 总被引:1,自引:0,他引:1
In order to identify wild fruits possessing high nutraceutical potential, the antioxidant activities of 56 wild fruits from South China were systematically evaluated. The fat-soluble components were extracted with tetrahydrofuran, and the water-soluble ones were extracted with a 50:3.7:46.3 (v/v) methanol-acetic acid-water mixture. The antioxidant capacities of the extracts were evaluated using the ferric reducing antioxidant power (FRAP) and Trolox equivalent antioxidant capacity (TEAC) assays, and their total phenolic contents were measured by the Folin-Ciocalteu method. Most of these wild fruits were analyzed for the first time for their antioxidant activities. Generally, these fruits had high antioxidant capacities and total phenolic contents. A significant correlation between the FRAP value and the TEAC value suggested that antioxidant components in these wild fruits were capable of reducing oxidants and scavenging free radicals. A high correlation between antioxidant capacity and total phenolic content indicated that phenolic compounds could be the main contributors to the measured antioxidant activity. The results showed that fruits of Eucalyptus robusta, Eurya nitida, Melastoma sanguineum, Melaleuca leucadendron, Lagerstroemia indica, Caryota mitis, Lagerstroemia speciosa and Gordonia axillaris possessed the highest antioxidant capacities and total phenolic contents among those tested, and could be potential rich sources of natural antioxidants and functional foods. The results obtained are very helpful for the full utilization of these wild fruits. 相似文献
6.
We investigate the possibility of probing R-parity violating interactions in forward-backward asymmetries, and conclude that the Tevatron collider is the best place to measure new interactions involving the first generation of quarks. With additional down type squark ~dk contributions, the charge asymmetry in e+e— events around Z-pole mass region at the Tevatron will be sensitive to R-parity violating couplings λ’11k, which was inaccessible to the LEP Qfb had inclusive measurement. Assuming no apparent deviation from SM prediction is observed, λ’11k〈 0.19 at 95% C.L. with squark mass Mdk=100 GeV can be derived. 相似文献
7.
We study theoretically the quantum effects of the littlest Higgs model (LH) mediated by flavor changing one-loop Feynman diagrams on the rare decay process t→ cH^0. The comparison of the decay width in the LH model with that in the standard model (SM) is made. We find that the decay branch ratio of t→ cH^0 in the LH model is at most of the order-10^-12, which is two order larger than in the SM. The numerical results show that the difference between the branch ratios in the LH model and the SM is generally sensitive to the LH model parameters, such as symmetry breaking scale f, Higgs boson mass mH0, and x=v'4f/v^2 in our chosen parameter space, but relatively insensitive to the value choice of the cosine of the mixing angle c and the ratio λ1/λ2. 相似文献
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Wei Li Ding-Tao Wu Fen Li Ren-You Gan Yi-Chen Hu Liang Zou 《Molecules (Basel, Switzerland)》2021,26(15)
In the present study, the influence of five drying techniques on the structural and biological properties of polysaccharides from lotus leaves (LLPs) was investigated. Results revealed that the yields, contents of basic chemical components, molecular weights, and molar ratios of compositional monosaccharides of LLPs varied by different drying technologies. Low molecular weight distributions were observed in polysaccharides obtained from lotus leaves by hot air drying (LLP-H), microwave drying (LLP-M), and radio frequency drying (LLP-RF), respectively. The high contents of bound polyphenolics were measured in LLP-H and LLP-M, as well as polysaccharides obtained from lotus leaves by vacuum drying (LLP-V). Furthermore, both Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR) spectra of LLPs were similar, indicating that drying technologies did not change their basic chemical structures. Besides, all LLPs exhibited obvious biological properties, including in vitro antioxidant capacities, antiglycation activities, and inhibitory effects on α-glucosidase. Indeed, LLP-H exhibited higher 2,2-azidobisphenol (3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging ability (IC50 values, LLP-H, 0.176 ± 0.004 mg/mL; vitamin C, 0.043 ± 0.002 mg/mL) and 2,2-diphenyl-1-(2,4,6-trinitrate phenyl) hydrazine radical scavenging ability (IC50 values, LLP-H, 0.241 ± 0.007 mg/mL; butylated hydroxytoluene, 0.366 ± 0.010 mg/mL) than others, and LLP-M exerted stronger antiglycation (IC50 values, LLP-M, 1.023 ± 0.053 mg/mL; aminoguanidine, 1.744 ± 0.080 mg/mL) and inhibitory effects on α-glucosidase (IC50 values, LLP-M, 1.90 ± 0.02 μg/mL; acarbose, 724.98 ± 16.93 μg/mL) than others. These findings indicate that both hot air drying and microwave drying can be potential drying techniques for the pre-processing of lotus leaves for industrial applications. 相似文献
10.
The supersymmetric electroweak corrections to the partial width of the decay x2 → Z0x1- , including thecontributions from the third generation quarks and squarks, are presented within the minimal supersymmetric standardmodel. With the reasonable parameters sets, which open this decay channel kinematically, the relative corrections canreach the value of ~ -6%. Therefore they should be taken into consideration for the precise experimental measurementat future colliders. 相似文献