THE CC1 PROJECT – SYSTEM FOR PRIVATE CLOUD COMPUTING

The main features of the Cloud Computing system developed at IFJ PAN are described. The project is financed from the structural resources provided by the European Commission and the Polish Ministry of Science and Higher Education (Innovative Economy, National Cohesion Strategy). The system delivers a solution for carrying out computer calculations on a Private Cloud computing infrastructure. It consists of an intuitive Web based user interface, a module for the users and resources administration and the standard EC2 interface implementation. Thanks to the distributed character of the system it allows for the integration of a geographically distant federation of computer clusters within a uniform user environment

Wpływ modyfikacji suszenia konwekcyjnego lawendyny na przebieg procesu i zawartość olejków eterycznych

The conducted study attempted to link the kinetics of convective drying of lavandin flowers with the quality of the obtained raw material determined by essential oil content, in order to optimize the process. The flowers were dried under natural convection conditions as well as in laboratory dryers with forced drying agent circulation under varying temperatures and periodical time of operation of the heating element in a continuous and intermittent mode. During the drying process, mass changes of the dried material were recorded. Essential oils content was determined using the hydrodistillation method with the use of Clevenger apparatus. For description of the kinetics of water content change, a model resulting from solution of a one-dimensional mass diffusion equation resulting from the Fick’s second law under preset initial and boundary conditions was used. A high matching coefficient of the model with the empirically obtained results was determined. Lavandin drying was conducted during the drying rate decrease stage in each of the established drying conditions. The highest amount of essential oils was observed in lavandin flowers dried under intermittent process conditions with initial temperature of 40°C, which was then decreased to 35°C, and with only cyclical provision of heat at 45-minute intervals.W przeprowadzonych badaniach podjęto próbę powiązania kinetyki suszenia konwekcyjnego kwiatów lawendyny z jakością uzyskanego surowca, określoną zawartością olejków eterycznych, celem optymalizacji tego procesu. Kwiaty suszono zarówno w warunkach konwekcji naturalnej, jak i w suszarkach laboratoryjnych z wymuszonym obiegiem czynnika suszącego w zmiennych temperaturach i okresowym czasem pracy elementu grzewczego, w trybie ciągłym i okresowo zmiennym. W czasie procesu suszenia rejestrowano zmiany masy suszonego materiału. Zawartość olejków eterycznych określono metodą hydrodestylacji z wykorzystaniem aparataów Clevengera. Do opisu kinetyki zmian zawartości wody zastosowano model wynikający z rozwiązania jednowymiarowego równania dyfuzji masy wynikającego z II prawa Ficka przy zadanych warunkach początkowych i brzegowych. Stwierdzono wysoki współczynnik jego dopasowania z wynikami uzyskanymi empirycznie. Suszenie lawendyny zachodziło w okresie malejącej szybkości suszenia w każdych, założonych warunkach suszenia. Największą ilość olejków eterycznych odnotowano w kwiatach lawendyny suszonych w okresowo zmiennych warunkach procesowych z początkową temperaturą 40°C, a następnie obniżeniem jej do 35°C i tylko cyklicznym dostarczaniu ciepła w odstępach 45 minutowych

Study of Gold, Copper and Nickel Adsorption, from their Acidic Chloride Solutions, Onto Activated Carbon

In this paper, a simple and effective method for gold recovery is described. The paper describes a way to recover gold onto activated carbon from a synthetic solution of gold(III) chloride. The method can also be used on nickel(II) as well as copper(II) chloride of where the metal ion ratios are comparable to the metal ratios found in some electronic waste. With the use of activated carbon in the process of electrolyte purification it is possible to selectively remove gold in metallic form from the solution. XPS studies have confirmed that metallic gold is present on the carbon surface. A spectrophotometric method was used to determine the concentration of Au(III) in the solution. Different concentration of nickel(II) as well as copper(II) were investigated. In all cases, adsorption and reduction of Au(III) to the metallic form was observed

Electrochemical Method of Copper Powder Synthesis on Rotating Electrode in the Presence of Surfactants

This paper presents a method of synthesizing copper powders by electrochemical method with the use of a rotating working electrode. The influence of the rotation speed of the working electrode, the current density, the concentration of copper ions, and the addition of ethylene glycol on the shape, size, and size distribution of the obtained powders were investigated. Properties of the synthesized powders were characterized by scanning electron microscopy (SEM) and X-ray powder diffractometry (XRD). It has been shown that it is possible to obtain copper powders with a size of 1 µm by an electrochemical method using the rotary cathode, in sulphate bath with addition of ethylene glycol as a surfactant. Increasing current density causes a decrease in the average size of the obtained powder particles. The addition of 2.5% of ethylene glycol prevents the formation of dendritic powders. The change in the concentration of copper ions in the range from 0.01 to 0.15 mol/dm3 in the electrolyte did not show any significant effect on the size of obtained particles. However, higher concentrations of copper limiting the presence of dendritic-shape particles. Changing the speed of rotation of the electrode affects both the size and the shape of synthesized copper powder. For the rotational speed of the electrode of 115 rpm, the obtained powders have a size distribution in the range of 0-3 µm and an average particle size of 1 µm. The particles had a polygonal shape with an agglomeration tendency