On the inverse Compton scattering model of radio pulsars

Some characteristics of the inverse Compton scattering (ICS) model are reviewed. At least the following properties of radio pulsars can be reproduced in the model: core or central emission beam, one or two hollow emission cones, different emission heights of these components, diverse pulse profiles at various frequencies, linear and circular polarization features of core and cones.Comment: 5 pages, no figures, LaTeX, a proceeding paper for Pacific Rim Conference on Stellar Astrophysics, Aug. 1999, HongKong, Chin

What if pulsars are born as strange stars?

The possibility and the implications of the idea, that pulsars are born as strange stars, are explored. Strange stars are very likely to have atmospheres with typical mass of $\sim 5\times 10^{-15}M_\odot$ but bare polar caps almost throughout their lifetimes, if they are produced during supernova explosions. A direct consequence of the bare polar cap is that the binding energies of both positively and negatively charged particles at the bare quark surface are nearly infinity, so that the vacuum polar gap sparking scenario as proposed by Ruderman & Sutherland should operate above the cap, regardless of the sense of the magnetic pole with respect to the rotational pole. Heat can not accumulate on the polar cap region due to the large thermal conductivity on the bare quark surface. We test this ``bare polar cap strange star'' (BPCSS) idea with the present broad band emission data of pulsars, and propose several possible criteria to distinguish BPCSSs from neutron stars.Comment: 31 pages in Latex. Accepted by AstroParticle Physic

Electric Character of Strange Stars

Using the Thomas-Fermi model, we investigated the electric characteristics of a static non-magnetized strange star without crust in this paper. The exact solutions of electron number density and electric field above the quark surface are obtained. These results are useful if we are concerned about physical processes near the quark matter surfaces of strange stars.Comment: 4 pages, 2 figures, LaTeX, Published in Chinese Physics Letters, Vol.16, p.77

Power analysis for RNA sequencing and mass spectrometry-based proteomics data

RNA-sequencing and mass spectrometry technologies have facilitated the differential expression discoveries in transcriptome and proteome studies. However, the determination of sample size to achieve adequate statistical power has been a major challenge in experimental design. The objective of this study is to develop a power analysis tool applicable to both RNA-seq and MS-based proteomics data. The methods proposed in this study are capable of both prospective and retrospective power analyses. In terms of the performance, the benchmarking results indicated that the proposed methods can give distinct power estimates for both differentially and equivalently expressed genes or proteins without prior differential expression analysis and other assumptions, such as, expected fraction of differentially expressed features, minimal fold changes and expected mean expressions. Using the proposed methods, not only can researchers evaluate the reliability of their acquired significant results, but also estimate the sufficient sample size for a desired power. The proposed methods in this study were implemented as an R package, which can be freely accessed from Bioconductor project at http://bioconductor.org/packages/PowerExplorer/