The effect of surface and Coulomb interaction on the liquid-gas phase transition of finite nuclei

By means of the Furnstahl, Serot and Tang's model, the effects of surface tension and Coulomb interaction on the liquid-gas phase transition for finite nuclei are investigated. A limit pressure p-lim above which the liquid-gas phase transition cannot take place has been found. It is found that comparing to the Coulomb interaction, the contribution of surface tension is dominate in low temperature regions. The binodal surface is also addressed.Comment: LaTex, 8 pages with 6 fig

Promoting the Protection of Marine Biogeographic Regions

Losses in marine biodiversity are becoming increasingly severe. In order to safeguard marine biodiversity, the Marine Conservation Institute (MCI) wanted a streamlined interface for use in proposing new marine protected areas (MPAs) and making the protection more consistent among marine biogeographic regions (MBRs). The institute also needed a new way to collaborate with its partners to propose new MPAs. The project provided a useful tool —an interactive web GIS application developed using Hypertext Markup Language, Cascading Style Sheets, and JavaScript —for MCI and its partners according to their needs. A geoprocessing service was consumed in the web application to calculate the protection coverage among MBRs. The web application contains four panels to help users share the information about MPAs and MBRs, design a new MPA graphically, and then update the MPA. It gives MPA designers an overview of the current and future protection status of each MBR and helps them propose new MPAs wisely and effectivel

Confronting the fourth generation two Higgs doublet model with the phenomenology of heavy Higgs bosons

A sequential fourth generation is known to be excluded because the non-decoupling contribution to $\kappa_g$, the Higgs coupling modifier with a gluon pair, is unacceptably large. Recently a new way to save the model was suggested in the Type-II two Higgs doublet model: if the Yukawa couplings of down-type fermions have wrong-sign, the contributions from $t'$ and $b'$ to $\kappa_g$ are cancelled. We study the theoretical and experimental constraints on this model, focusing on the heavy Higgs bosons. Two constraining features are pointed out. First the exact wrong-sign limit does not allow the alignment, which makes the perturbative unitarity for the scalar-scalar scattering put the upper bounds on the heavy Higgs boson masses like $M_H, M_A \lesssim 920$ GeV and $M_{H^\pm} \lesssim 620$ GeV. Secondly, the Yukawa couplings of the fourth generation fermions to the heavy Higgs bosons are generically large as being proportional to the heavy fermion mass and, for the down-type fermions, to $\tan\beta$ as well. The gluon fusion productions of $H$ and $A$ through the fourth generation quark loops become significant. We found that the current LHC data on $pp \to Z Z$ for $H$ along with the theoretical and indirect constraints exclude the model at leading order.Comment: 30 pages with 17 figure