Different blog use, different participation

Though it seems to be more popular for most people to discuss some issues with their friends on the micro blogs such as Twitter or community websites such as Facebook, there is still a doubt that these websites would play a role to facilitate civic engagement or promote the frequency for talking about public affairs. It is said that the success of Obama‟s case did intrigue politicians‟ attention for the effect of blog in Taiwan. That is why the study should be traced to the experiences of blog in America. There are some surveys which improved that the number of blogs have grown since 2001(Levy, 2002; Henning, 2003). In this case, Wallsten (2007) indicated that political blogs seems to have been grown faster than other types of blogs. In order to find the relationship between blog use and political participation, this study will focus on political blogs. Researchers pointed that the role of blog has become an open forum for users to address issues(Bruns, 2006; Cristol, 2002; Wall, 2006) and some researchers further claimed that blogs have been portrayed as political outlets (Kerbel and Bloom, 2005; Sweetser and Kaid, 2008; Trammell et al., 2006b) where allow users to express their self-perspective and access to different perspectives on an issue (Herring et al., 2004; Trammell and Keshelashvili, 2005; Papacharissi, 2004; Thompson, 2003). In brief, blog users also play a key role in the blog world. For this reason, the study will explore the connotation of blog users and further examine the relationship between blog use and political participation. But it seems to be less studies about types of blog users that could assess the effects of communication on blogs more precisely. To target more real supporters, this article will categorize the types of users into three kinds and measure the extent to their separate behavior which linked to political participation. --

BCS-BEC crossover in nuclear matter with the relativistic Hartree-Bogoliubov theory

Based on the relativistic Hartree-Bogoliubov theory, the influence of the pairing interaction strength on the di-neutron correlations and the crossover from superfluidity of neutron Cooper pairs in the $^{1}S_{0}$ channel to Bose-Einstein condensation of di-neutron pairs is systematically investigated in the nuclear matter. The bare nucleon-nucleon interaction Bonn-B is taken in the particle-particle channel with an effective factor to simulate the medium effects and take into account the possible ambiguity of pairing force, and the effective interaction PK1 is used in the particle-hole channel. If the effective factor is larger than 1.10, a di-neutron BEC state appears in the low-density limit, and if it is smaller than 0.85, the neutron Cooper pairs are found totally in the weak coupling BCS region. The reference values of several characteristic quantities which characterize the BCS-BEC crossover are obtained respectively from the dimensionless parameter $1/(k_{\rm Fn}a)$ with $a$ the scattering length and $k_{\rm{Fn}}$ the neutron Fermi momentum, the zero-momentum transfer density correlation function D(0) and the effective chemical potential $\nu_{\rm n}$.Comment: 8 pages, 4 figures, 2 tables, Accepted Thursday Jun 14, 2012 for Physical Review

Generation of Anisotropic Massless Dirac Fermions and Asymmetric Klein Tunneling in Few-Layer Black Phosphorus Superlattices

Artificial lattices have been employed in many two-dimensional systems, including those of electrons, atoms and photons, in a quest for massless Dirac particles with flexibility and controllability. Periodically patterned molecule assembly and electrostatic gating as well as moir\'e pattern induced by substrate, have produced electronic states with linear dispersions from isotropic two-dimensional electron gas (2DEG). Here we demonstrate that massless Dirac fermions with tunable anisotropic characteristics can, in general, be generated in highly anisotropic 2DEG under slowly varying external periodic potentials. For patterned few-layer black phosphorus superlattices, the new chiral quasiparticles exist exclusively in an isolated energy window and inherit the strong anisotropic properties of pristine black phosphorus. These states exhibit asymmetric Klein tunneling with the direction of incidence for wave packet with perfect transmission deviating from normal incidence by more than 50{\deg} under an appropriate barrier orientation