The role of three-body interactions in two-dimensional polymer collapse

Various interacting lattice path models of polymer collapse in two dimensions demonstrate different critical behaviours. This difference has been without a clear explanation. The collapse transition has been variously seen to be in the Duplantier-Saleur $\theta$-point university class (specific heat cusp), the interacting trail class (specific heat divergence) or even first-order. Here we study via Monte Carlo simulation a generalisation of the Duplantier-Saleur model on the honeycomb lattice and also a generalisation of the so-called vertex-interacting self-avoiding walk model (configurations are actually restricted trails known as grooves) on the triangular lattice. Crucially for both models we have three and two body interactions explicitly and differentially weighted. We show that both models have similar phase diagrams when considered in these larger two-parameter spaces. They demonstrate regions for which the collapse transition is first-order for high three body interactions and regions where the collapse is in the Duplantier-Saleur $\theta$-point university class. We conjecture a higher order multiple critical point separating these two types of collapse.Comment: 17 pages, 20 figure

Chapter A new transplanting method of Posidonia oceanica (Linnaeus) Delile, 1813 plants

The seabed of the port of Piombino was to be modified to allow the arrivals of cruise ships. The great problem to overcome was the presence of Posidonia oceanica (Linnaeus) Delile, 1813 meadows. Initially, the project was to remove and grind the plants of the meadow causing a considerable environmental damage. The Port Authority of Piombino asked the Institute of Marine Biology and Ecology to study an alternative project. Knowing the short results of the methods of replanting P. oceanica plant by plant we decided to transplant 340 clods of P. oceanica of 2 m2 to a nearby meadow

THE CIVIL AND POLITICAL SOCIETY DURING NATION BUILDING PERIOD IN ALBANIA: 1912-1939

The Albanian history is full of consecutive invasions that have continued for different centuries. The power has been in the hands of foreigners for different centuries. Therefore, the social and political conscience was mainly composed of the survival concept. The governance of the Ottoman Empire was based on the military and political power instead of a market's dynamics. This factor hasprevented for a long period of time the development of a middle and urban classthat is the base of every modern society. As the author E. Vlora highlighted thesociety was divided in two main categories: the nobles composed of landowners and some few bourgeois that have never been democrats and the massive population composed of peasants, shepherds, soldiers that used to follow their leaders.Due to these factors, after the declaration of the independence in 1912, the efforts for the development of a civil or political society were not easy to undertake. Thispaper will try to analyze the dynamics and the logic of the creation and development of a civil and political society in the nation building period. The analysis will be focused on the evaluations of different social, historical andcultural factors that have strongly influenced the process of the creation of the civil and the political class. In the framework of this paper the civil society will be assumed as a community based on communication, persuasion, consensus anddiversity (Almond and Verba, 1963). With the term political class will be intended the community of people that is or tries to be to be part of the political power and government

Design and implementation of a testbed for data distribution management

Data Distribution Management (DDM) is a core part of High Level Architecture standard, as its goal is to optimize the resources used by simulation environments to exchange data. It has to filter and match the set of information generated during a simulation, so that each federate, that is a simulation entity, only receives the information it needs. It is important that this is done quickly and to the best in order to get better performances and avoiding the transmission of irrelevant data, otherwise network resources may saturate quickly. The main topic of this thesis is the implementation of a super partes DDM testbed. It evaluates the goodness of DDM approaches, of all kinds. In fact it supports both region and grid based approaches, and it may support other different methods still unknown too. It uses three factors to rank them: execution time, memory and distance from the optimal solution. A prearranged set of instances is already available, but we also allow the creation of instances with user-provided parameters. This is how this thesis is structured. We start introducing what DDM and HLA are and what do they do in details. Then in the first chapter we describe the state of the art, providing an overview of the most well known resolution approaches and the pseudocode of the most interesting ones. The third chapter describes how the testbed we implemented is structured. In the fourth chapter we expose and compare the results we got from the execution of four approaches we have implemented. The result of the work described in this thesis can be downloaded on sourceforge using the following link: https://sourceforge.net/projects/ddmtestbed/. It is licensed under the GNU General Public License version 3.0 (GPLv3)