Particle In Cell Simulation of Combustion Synthesis of TiC Nanoparticles

A coupled continuum-discrete numerical model is presented to study the synthesis of TiC nanosized aggregates during a self-propagating combustion synthesis (SHS) process. The overall model describes the transient of the basic mechanisms governing the SHS process in a two-dimensional micrometer size geometry system. At each time step, the continuum (micrometer scale) model computes the current temperature field according to the prescribed boundary conditions. The overall system domain is discretized with a desired number of uniform computational cells. Each cell contains a convenient number of computation particles which represent the actual particles mixture. The particle-in-cell (discrete) model maps the temperature field from the (continuum) cells to the respective internal particles. Depending on the temperature reached by the cell, the titanium particles may undergo a solid-liquid transformation. If the distance between the carbon particle and the liquid titanium particles is within a certain tolerance they will react and a TiC particle will be formed in the cell. Accordingly, the molecular dynamic method will update the location of all particles in the cell and the amount of transformation heat accounted by the cell will be entered into the source term of the (continuum) heat conduction equation. The new temperature distribution will progress depending on the cells which will time-by-time undergo the chemical reaction. As a demonstration of the effectiveness of the overall model some paradigmatic examples are shown.Comment: submitted to Computer Physics Communication

Test of the heavy quark-light diquark approximation for baryons with a heavy quark

We check a commonly used approximation in which a baryon with a heavy quark is described as a heavy quark-light diquark system. The heavy quark influences the diquark internal motion reducing the average distance between the two light quarks. Besides, we show how the average distance between the heavy quark and any of the light quarks, and that between the heavy quark and the center of mass of the light diquark, are smaller than the distance between the two light quarks, which seems to contradict the heavy quark-light diquark picture. This latter result is in agreement with expectations from QCD sum rules and lattice QCD calculations. Our results also show that the diquark approximations produces larger masses than the ones obtained in a full calculation.Comment: 9 latex pages, 5 figures, 6 table

Dilepton Production at SPS-energy Heavy Ion Collisions

The production of dileptons is studied within a hadronic transport model. We investigate the sensitivity of the dilepton spectra to the initial configuration of the hadronic phase in a ultrarelativistic heavy ion collision. Possible in medium correction due to the modifications of pions and the pion form factor in a hadronic gas are discussed.Comment: Dedicated to Gerry Brown in honor of the 32nd celebration of his 39th birthday. 31 pages Latex including 13 eps-figures, uses psfig.sty and epsf.st

Shell-model calculations and realistic effective interactions

A review is presented of the development and current status of nuclear shell-model calculations in which the two-body effective interaction is derived from the free nucleon-nucleon potential. The significant progress made in this field within the last decade is emphasized, in particular as regards the so-called V-low-k approach to the renormalization of the bare nucleon-nucleon interaction. In the last part of the review we first give a survey of realistic shell-model calculations from early to present days. Then, we report recent results for neutron-rich nuclei near doubly magic 132Sn and for the whole even-mass N=82 isotonic chain. These illustrate how shell-model effective interactions derived from modern nucleon-nucleon potentials are able to provide an accurate description of nuclear structure properties.Comment: 71 pages, to be published in Progress in Particle and Nuclear Physic

Whether NGOs Should get into the Litigative Process

This paper examines the question as to whether the operative framework of NGOs should include litigative strategy. It begins with a brief profile of the concerned organisation URMUL. It advocates a self-study bu each NGO as to whether theu possess the necessary litigative orientation. It then identifies the various factors that must be considered. For obiective planning bu the NGO, the authors propose leaner obiectives, inter-disciplinaru knowledge about the dynamics of litigation, identification of key concepts and the conceptual framework, and in conclusion, suggest methods of evaluation

The Determinants of Compliance on Environmental Tax: The Insights of Theoretical and Experimental Approaches Motivated by the Case of Indonesia

This study is intended to provide the clue regarding the determinants of compliance with environmental tax under imperfect monitoring and the presence of bribery, motivated by the case of Indonesia. The study is expected to contribute on environmental policy and tax compliance literatures, particularly by examining the impact of financial reward under the presence of bribery, aside of others conventional compliance instruments such as tax rate, audit, and sanction. In addition to financial reward, this study also incorporates the bribe explicitly as a determinant of compliance. The study employs theoretical and experimental approaches. While theoretical analysis find that the compliance will decrease with tax rate and increase with audit, sanction, financial reward, and the bribe rate; the experiment findings indicate that the impact of each determinant are vary according to the existence of bribery. Despite the difference, both approaches show that the bribery indeed hampers the compliance on environmental tax. The bribery encourages the polluting firms to aggressively evade the environmental tax as the tax rate increase and curbs the positive impact of financial reward in enhancing the compliance

Correlation of structural inhomogeneities with transport properties in amorphous silicon germanium alloy thin films

LGEP 2010 ID = 605International audienc

Human security and access to water, sanitation, and hygiene: exploring the drivers and nexus

Water security challenges are mostly covered in the literature on the food and energy nexus. This chapter however adopts a broader conception of water security in relation to lack of access to water, sanitation, and hygiene (WASH), and argues that the human rights approach could be instrumental in addressing the drivers that hinder access to WASH. Through policy analysis and literature review the chapter addresses the following research questions: a) What is access to WASH? b) What are the drivers of poor access to WASH? c) What are the multi-level human security implications of the lack of access to WASH? d) What improvements can be made in the post-2015 development agenda to address the drivers and the related human security challenges? The chapter essentially illustrates the need to translate global human rights norms into contextually appropriate operational targets and instruments for policy implementation at the national and local levels