Design and test of the gas-dynamic carbon dioxide laser experimental setup

An experimental gas-dynamic laser apparatus based on acetylene-in-oxygen combustion has been designed and tested. Main setup volume was designed as a modular type for flexibility. A vacuum system, electrical and measuring elements were attached to the volume. Tests of the gas supply, vacuum system, electronics and lasing have been performed. They have shown reliable functionality and durability of all units.Physical chemistry 2004 : 7th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 21-23 September 200

8Li+alpha decay of 12B and its possible astrophysical implications

The 12B excitation energy spectrum has been obtained from coincidence measurements of the 9Be+7Li -> 2alpha+8Li reaction at E{0}=52 MeV. The decay of the states at excitations between 10 and 16 Mev into alpha$+8Li has been observed for the first time. Observed alpha-decay indicates possible cluster structure of the 12B excited states. The influence of these states on the cross section of the astrophysically important 8Li(alpha,n)11B and 9Be+t reactions is discussed and the results are compared with existing results.Comment: accepted for publication in Europhysics Letter

Comment on “Heavy Cluster Knockout Reaction 16O(12C, 212C)4He and the Nature of the 12C-12C Interaction Potential”

A Comment on the Letter by B. N. Joshi et al., Phys. Rev. Lett. 106 022501 (2011)

Procjena rizika za nastanak karcinoma zbog izloženosti malim dozama ionizirajućeg zračenja

Although ionising radiation has proven beneficial in the diagnosis and therapy of a number of diseases, one should keep in mind that irradiating healthy tissue may increase the risk of cancer. In order to justify an exposure to radiation, both the benefits and the risks must be evaluated and compared. The deleterious effects of medium and high doses are well known, but it is much less clear what effects arise from low doses (below 0.1 Gy), which is why such risk estimates are extremely important. This review presents the current state, important assumptions and steps being made in deriving cancer risk estimates for low dose exposures.Unatoč velikoj važnosti i koristi ionizirajućeg zračenja u dijagnosticiranju i liječenju mnogih bolesti, treba imati na umu da se ozračivanjem zdravog tkiva može povećati rizik od karcinoma. Stoga je vrlo važno znati kakve rizike možemo očekivati ovisno o primljenoj dozi zračenja. Za razliku od područja srednjih i velikih doza za koje su štetni učinci dobro poznati, područje malih doza (ispod 0,1 Gy) puno je nejasnoća, a procjena rizika vrlo je važna. U ovom radu prikazane su osnovne pretpostavke i koraci u procjeni rizika od karcinoma uzrokovanih zračenjem u području malih doza

POLITICAL CLIENTELISM AND CORRUPTION AS ECONOMIC AND SOCIAL EXCHANGE

Althout, scientific interest in the informal economy is from a recent date, there are already serious analyzes that define its forms, as well as standardized methods that measure its scope. In this text we will point out some theoretical dilemmas concerning informal economy as a sector emebeded deeply in the society as a whole. The informal economy sector can be understood as a rational response by people to the way of life, the environment, the way in which the institutions work, the economic development of society or the culture itself - despite the fact that some consequences have an irrational character (exploitation, discrimination, violation of human rights and freedoms). Special attention is paid to political clientelism and corruption as forms of informal economy with a special focus on the situation in R. of Macedonia

EUROPEAN INTEGRATION AND GOVERNANCE – CHALLENGES AND PERSPECTIVES

European integration is largely seen as a process that has delivered stability and peace, as well as the economic prosperity of the Member States of the European Union (EU). It has helped to raise standards of living and build an internal market. But, there are more and more arguments that the EU decision-making system is not effective and the governance model is obsolete. Some are pointing out increasingly rising divergence on crucial EU policy matters. Others are arguing that the EU has been confronted with the challenge of heterogeneity, stressing the issue of immigration as the one of the most contentious policy matters currently facing the EU. Besides those controversial issues inside EU and different positions among member states there is Brexit. The paper analyses in particular the issue of EU economic governance and one of its main pillars – the European Semester. The Country Specific Recommendations, as the integral part of the economic governance model are presented in a view of the new framework envisaged to tighten budgetary coordination and keep the deficit and debt levels in accordance to the EU rules

SORPTION OF METHYLENE BLUE ONTO ORANGE AND LEMON PEEL

This study examines the sorption of methylene blue on the cheap unconventional bio sorbents, citrus fruits: oranges and lemons. Bio sorbents which was used was: orange and lemon peel, seeds and pulp. The results are compared with results of sorption to mineral sorbents, zeolite clinoptilolite, Pyrolox and Birm. Sorption kinetics and the influence of pH on the sorption of methylene blue on orange and lemon peel was examined. Sorption isotherm of methylene blue onto the orange end lemon peel was determined at 25oC with the initial concentrations of methylene blue 50 – 1000 mg/dm3. The sorption kinetic data were analyzed using pseudo–first–order and pseudo–second-order models. It was found that the pseudo-second-order kinetic model was the best applicable model to describe the sorption kinetics. When the pH of the solution dyes was 2-3, the sorption of methylene blue was slightly weaker than at pH 3-6. In the studied concentration range 50-1000 mg/dm3 sorption of methylene blue on orange and lemon peel was linear, with sorption efficiency of approximately 100%. The capacity of zeolite for methylene blue was 20 mg/g. Sorption capacity of citrus waste was significantly higher than in the mineral sorbents (zeolite, Pyrolox, Birm)

Kako bi trebalo organizovati omeđavanje

Kako bi trebalo organizovati omeđavanje