The purpose of this paper is to present the IZO application that calculates and visualizes coefficients of adsorption isotherms according to Freundlich, Langmuir, and BET in a classic and linear system, in a simple communicative way. The application also calculates the working time of the adsorption bed based on the transformation of the mass balance equation, and according to the Zuchowicki, Zabieziński, Tichonow, and the Bohart-Adams equations. The laboratory tests of the adsorption process of leachate from a municipal landfill on selected active coals ORGANOSORB 10, DESOTEK, and BA-10, were conducted to check the program for accuracy. Results of tests confirm that the linearization method of the calculation of adsorption isotherms coefficients, used in the IZO application, gives sufficient accuracy and may be used as an alternative of, e.g., the nonlinear estimation method.
We investigate an influence of the crystal structure imperfections on the electronic properties and dielectric functions of the In 0.5 Tl 0.5 I semiconductor in the frame of the density functional theory calculations. The tensor of electron effective mass m à ij for the InI, In 0.5 Tl 0.5 I and TlI crystals has been calculated for the valence and conduction bands at different K-points of the Brillouin zone. The dielectric functions e(hm) of the imperfect crystals based on In 0.5 Tl 0.5 I solid state solution with iodine vacancy and a thallium interstitial atom were calculated taking into consideration the inter-band and intra-band electron transitions. The studies of the imperfect crystals reveal increased low-frequency and stationary electron conductivity with anisotropy resulted from the anisotropy of the electron effective mass tensor. Our findings explain the origin of crucial changes in the band structure by formation of the donor half-occupied levels close to the unoccupied conduction bands due to the crystal structure defects, i.e., iodine vacancy or a thallium interstitial atom. It has been shown that in the case of real crystals, in particular metal-halides, the proper consideration of defects in quantum-chemical calculations results in a better matching with experimental data and, opposite to the perfect structure calculations, gives opportunities to explain the observed phenomena.
Abstract:The article is an attempt of reconstruction of conditions determining taking up of so-called "participatory perspective". The presence of that perspective is treated as a factor identifying possibilities of knowledge construction or creating a positive change. The analysis is concentrated on the category of "researcher's participation", including a way of its presentation in a set of current approaches oriented on improving research practice. In the description showing the attributes of this kind of participation the four types of conditions are presented; they are as follows: concepts of practicability, resources and variants of knowledge that are used, relations of cooperation, and axiological references. A part of the article is dedicated to the characterization of their significance for building up the participatory perspective, stressing its formative and autoformative values. The specified research perspective is viewed as the variant of ethically based practice, in which all methodological decisions need to be made with reference to values.
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