8,296 research outputs found
Gauge Family Model and New Symmetry Breaking Scale From FCNC Processes
Based on the gauge family symmetry model which was proposed to
explain the observed mass and mixing pattern of neutrinos, we investigate the
symmetry breaking, the mixing pattern in quark and lepton sectors, and the
contribution of the new gauge bosons to some flavour changing neutral currents
(FCNC) processes at low energy. With the current data of the mass differences
in the neutral pseudo-scalar systems, we find that the
symmetry breaking scale can be as low as 300TeV and the mass of the
lightest gauge boson be about TeV. Other FCNC processes, such as the
lepton flavour number violation process
and the semi-leptonic rare decay , contain
contributions via the new gauge bosons exchanging. With the constrains got from
system, we estimate that the contribution of the new physics is
around , far below the current experimental bounds.Comment: 3figure
Case Study on Trade Union Establishment’s Innovation of Shanghai Federation of Trade Unions
In order to solve the problem of the worker in joining trade unions and and the formation rate of trade unions,Shanghai federation of trade unions strives to explore the solutions,then issued the "Tentative scheme of Shanghai federation of trade unions office about organizing employees to join trade unions outside the system of enterprise"(named “Tentative scheme” for short),and has achieved initial success.This paper summarizes the practice and experience of Shanghai federation of trade unions,finally it offers some suggestions for future work.
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Tumor promoter TPA activates Wnt/β-catenin signaling in a casein kinase 1-dependent manner.
The tumor promoter 12-O-tetra-decanoylphorbol-13-acetate (TPA) has been defined by its ability to promote tumorigenesis on carcinogen-initiated mouse skin. Activation of Wnt/β-catenin signaling has a decisive role in mouse skin carcinogenesis, but it remains unclear how TPA activates Wnt/β-catenin signaling in mouse skin carcinogenesis. Here, we found that TPA could enhance Wnt/β-catenin signaling in a casein kinase 1 (CK1) ε/δ-dependent manner. TPA stabilized CK1ε and enhanced its kinase activity. TPA further induced the phosphorylation of LRP6 at Thr1479 and Ser1490 and the formation of a CK1ε-LRP6-axin1 complex, leading to an increase in cytosolic β-catenin. Moreover, TPA increased the association of β-catenin with TCF4E in a CK1ε/δ-dependent way, resulting in the activation of Wnt target genes. Consistently, treatment with a selective CK1ε/δ inhibitor SR3029 suppressed TPA-induced skin tumor formation in vivo, probably through blocking Wnt/β-catenin signaling. Taken together, our study has identified a pathway by which TPA activates Wnt/β-catenin signaling
Criteria for accurate determination of the magnon relaxation length from the nonlocal spin Seebeck effect
The nonlocal transport of thermally generated magnons not only unveils the
underlying mechanism of the spin Seebeck effect, but also allows for the
extraction of the magnon relaxation length () in a magnetic
material, the average distance over which thermal magnons can propagate. In
this study, we experimentally explore in yttrium iron garnet (YIG)/platinum
systems much further ranges compared with previous investigations. We observe
that the nonlocal SSE signals at long distances () clearly deviate from a
typical exponential decay. Instead, they can be dominated by the nonlocal
generation of magnon accumulation as a result of the temperature gradient
present away from the heater, and decay geometrically as . We emphasize
the importance of looking only into the exponential regime (i.e., the
intermediate distance regime) to extract . With this principle, we
study as a function of temperature in two YIG films which are 2.7
and 50 m in thickness, respectively. We find to be around 15
m at room temperature and it increases to 40 m at 3.5 K. Finite
element modeling results agree with experimental studies qualitatively, showing
also a geometrical decay beyond the exponential regime. Based on both
experimental and modeling results we put forward a general guideline for
extracting from the nonlocal spin Seebeck effect.Comment: 9 pages, 7 figure
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