1,403 research outputs found
Marriage Customs in Gulin County, Sichuan Province
Miao Nationality in Sichuan Province commonly known as the “Southern Sichuan Miao”, mainly is found in Sichuan south which is adjacent to Guizhou Province. Based on fieldworks of three visiting, the marriage customs in Gulin County is found to be the most unique among Southern Sichuan Miao. They include the forms of pledging love, Caishan Festival; Miao Fair, halfway feast,: passing umbrella, summoning the spirits, pulling chicken tongue, taking old names, bumping against the door, singing loudly ceremony songs, and so on. These customs are valuable assets which are primitive, elegant and rich, on inheriting on Miao history and culture
Pre-merger electromagnetic counterparts of binary compact stars
We investigate emission signatures of binary compact star gravitational wave
sources consisting of strongly magnetized neutron stars (NSs) and/or white
dwarfs (WDs) in their late-time inspiral phase. Because of electromagnetic
interactions between the magnetospheres of the two compact stars, a substantial
amount of energy will be extracted, and the resultant power is expected to be
erg/s in the last few seconds before the two stars
merge, when the binary system contains a NS with a surface magnetic field
G. The induced electric field in the process can accelerate charged
particles up to the EeV energy range. Synchrotron radiation is emitted from
energetic electrons, with radiative energies reaching the GeV energy for binary
NSs and the MeV energy for NS - WD or double WD binaries. In addition, a
blackbody component is also presented and it peaks at several to hundreds keV
for binary NSs and at several keV for NS - WD or double WD binaries. The strong
angular dependence of the synchrotron radiation and the isotropic nature of the
blackbody radiation lead to distinguishable modulation patterns between the two
emission components. If coherent curvature radiation is presented, fast radio
bursts could be produced. These components provide unique simultaneous
electromagnetic signatures as precursors of gravitational wave events
associated with magnetized compact star mergers and short gamma ray bursts
(e.g., GRB 100717).Comment: 16 pages, 8 figures, 1 table. Minor corrections to match the version
on Ap
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Clustering and principal-components approach based on heritability for mapping multiple gene expressions
When the number of phenotypes in a genetic study is on the scale of thousands, such as in studies concerning thousands of gene expression levels, the single-trait analysis is computationally intensive, and heavy adjustment of multiple comparisons is required. Traditional multivariate genetic linkage analysis for quantitative traits focuses on mapping only a few phenotypes and is not feasible for a large number of traits. To cope with high-dimensional phenotype data, clustering analysis and principal-component analysis (PCA) are proposed to reduce the data dimensionality and to map shared genetic contributions for multiple traits. However, standard clustering analysis and PCA are applicable for independent observations. In most genetic studies, where family data are collected, these standard analyses can only be applied to founders and can lead to the loss of information. Here, we proposed a clustering method that can exploit family structure information and applied the method to 29 gene expression levels mapped to a reported hot spot on chromosome 14. We then used a PCA approach based on heritability applicable to small number of traits to combine phenotypes in the clusters. Lastly, we used a penalized PCA approach based on heritability applicable to arbitrary number of traits to combine 150 gene expression levels with the highest heritability. Genome-wide multipoint linkage analysis was carried out on the individual traits and on the combined traits. Two previously reported peaks on chromosomes 14 and 20 were identified. Linkage evidence was stronger for traits derived from methods that incorporate family structure information
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