University Ekonomiczny

Poznań, Poland

University Ekonomiczny

Poznań, Poland

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Cieszynska A.,University Ekonomiczny | Regel-Rosocka M.,Poiitechnika Poznahska | Wisniewski M.,Poznan University of Technology
Przemysl Chemiczny | Year: 2011

A review, with 79 refs., of methods for solvent extraction of Ft group metals, esp. Pd(ll) ions present in trace amts., from spent solns., wastewater, anode slimes, as well as spent vehicle or industrial catalysts.


Peusner Network Thermodynamics (PNT) enables transformation of Kedem-Katchalsky (K-K) membrane transport equations from classical to network form. For ternary and homogenous nonelectrolyte solutions, transformation results in two symmetrical and six hybrid forms of network K-K equations. Symmetrical forms of these equations contain Peusner's coefficients Rij or Lij, whereas hybrid forms contain Peusner's coefficients Hij, Wij, Nij, Kij, Sij or Pij. Experimental transport parameters can be used to calculate Peusner's coefficients, i.e. hydraulic permeability (Lp), solute permeability (ω) and reflection (σ) parameters. The aim of this paper is to derive network form of K-K equations for homogenous ternary nonelectrolyte solutions that contain Peusner's coefficients K ij (i, j ∈ {1, 2, 3}). These coefficients form a third degree matrix of Peusner's coefficients [K]. Moreover, we aim to calculate dependences of K ij coefficients on average concentration of one component of solution in a membrane (C1 ) when value of the second one (C2 ) is fixed and to compare these dependences with appropriate dependences for coefficients R ij , L ij , H ij and N ij presented in 1-5 parts of the paper. A cellulose hemodialysis membrane (Nephrophan) of known transport parameters for aqueous glucose and ethanol solutions was a research material. The PNT formalism and classical form of K-K equations for ternary non-electrolyte solutions was a research tool in this paper. The network form of K-K equations was presented using the hybrid transformation of Peusner's thermodynamic networks for ternary solutions that contain solvent and two dissolved substances. For homogenous solutions, we calculated dependences of Peusner's coefficients Kij and quotients Kij/Rij, Kij/Lij, Kij/Hij and Kij/Nij (i, j ∈ {1, 2, 3}) on average concentration of one component (C1) of the solution in a membrane when value of the second one is fixed (C2). The network form of K-K equations that contain Peusner's coefficients Kij (i, j ∈ {1, 2, 3}) is a novel tool to study membrane transport. We showed based on calculations that coefficients K12, K21, K23 and K32 are sensitive for composition and concentration of solutions separated by a polymer membrane.


Bacteriocins are antimicrobial proteins or peptides produced by both Gram-positive and Gram-negative bacteria. Many of these metabolites are active towards closely related species, but some of them are able to inhibit bacteria not related with bacteriocin producer, including food pathogens such as Listeria monocytogenes or Clostridium botulinum. The most studied bacteriocins are those produced by lactic acid bacteria, but an increased interest in bacteriocins synthesized by propionibacteria has been observed in the last years. In this paper, the data on molecular characteristics and biochemical properties of actually known bacteriocins produced by this group of bacteria are presented.


Ocinski D.,University Ekonomiczny | Kociolek-Balawejder E.,University Ekonomiczny
Przemysl Chemiczny | Year: 2011

A review, with 44 refs., of methods for sorption of As-contg. ions on com. available anion-exchange resins, hydrophilic polymers with primary NH 2 groups and chem. modified agricultural by-products.


Kociolek-Balawejder E.,University Ekonomiczny | Wilk L.J.,University Ekonomiczny
Przemysl Chemiczny | Year: 2011

A rewiev, with 72 refs., of the methods for purifn. of biogas by sorption of H 2S with Fe 2O 3 activated C and other sor-bents, mol. sieves, synthetic SiO 2, solns. of FeCl 3 and NaOH or oxidants as well as by biochem. processes.


Krolikowska E.,Jastrzebska Spolka Weglowa | Sierpinska-Sawicz A.,University Ekonomiczny
Gospodarka Surowcami Mineralnymi / Mineral Resources Management | Year: 2016

In the article, the authors attempt to quantify the covenants, which are the special terms of the bond issuance programs, reducing a risk of the bondholders. The type and the character of the covenants depend on several circumstances like: financial situation of a bond issuer, industry risk, country risk or economic situation. The most common used covenants refer to several limitations like payments, taking out the loans, issuance of the next series of bonds, credit events, dividend payouts. The separate group of covenants are those which constitute a limitation of an assets disposal, a range of the investments, the mergers and acquisitions or those that refer to maintaining the rating. The belief that the bond issuance is the easiest way of rising the funds in comparison to a bank loan is not fully supported. The covenants have significant influence on a performance of a bond issuer. Some of the covenants cause losing a flexibility of a company and restrict a possibility of making the effective decisions which can lead to rising the risk of a bankruptcy. The limitations included in a bond issuance program could be particularly inconvenient for a company’s development and may demand the assets restructuring which range is hard to predict while a bond agreement is being signed. In terms of using the funds gained from bond issuance for an operating performance, the ability to go in a line with the covenants is less likely while the same funds will be spent on the investments which will generate the profits and amortisation in the future. It allows to gain the appropriate level of EBITDA as well as makes a bond repurchase possible. It is worth to add that the investors and the stock brokers who are responsible for a bond issuance program preparation have an influence on the quantity and quality of the covenants. They define the standard used covenants in the bond agreements. The knowledge and the negotiation skills of the managers have significant influence on the adjusting the bond contracts to the company and branch risk. © 2016 Gospodarka Surowcami Mineralnymi Mineral Resources Management. All rights reserved.


Using symmetrical or hybrid transformation Kedem-Katchalsky membrane transport equations (K-K) for ternary solutions can be transformed to symmetrical (Rij lub Lij) or hybrid (contain coefficients Hij, Wij, Sij, Nij, Kij or Pij) network form. Derivation of network form of K-K equations for homogeneous ternary non-electrolyte solutions containing Peusner's coefficients Hij (i, j element of {1, 2, 3}) and calculation of these coefficients for solutions consisting of solvent and two dissolved substances. Moreover comparison of these coefficients with coefficients Rij and Lij presented in the first and second part of the paper (Polim. Med.) was shown. Coefficients Hij (i, j element of {1, 2, 3}) can be calculated on the basis of experimentally determined transport parameters i.e. the hydraulic permeability coefficients (Lp), solute permeability (omega) and reflection (sigma). The research material was the membrane (Nephrophan) with known parameters for the transport of aqueous solutions of glucose and ethanol and the research tool was the formalism of Peusner's network thermodynamics (PNT) and K-K equation for ternary non-electrolyte solutions. Using the hybrid transformation of the Peusner's thermodynamic networks, the network form of K-K equations for ternary solution consisting of solvent and two dissolved substances was presented. Dependences of Peusner's coefficients Hij (i, j element of {1, 2, 3}) in the conditions of solutions homogeneity from the average concentration of one component of solution in the membrane (C1) with a constant value of second component (C2). Analysis of Peusner's coefficients Hij (i, j element of {1, 2, 3}) is a new tool, which can be used for examination of the membrane transport. The calculations proved, that the values of coefficients H12, H21, H22 and H32 are sensitive to the concentration and composition of the non-electrolyte solutions separated by the polymer membrane.


Symmetrical or hybrid transformation of Kedem-Katchalsky membrane transport equations (K-K) can be performed using Peusner's network thermodynamics (PNT). For ternary and homogeneous solutions of non-electrolytes it result in two symmetrical and six hybrid network form of K-K equations. The symmetrical form of these equations contain Peusner's coefficients Rij or Lij, and hybrid form--Peusner's coefficients Hij, Nij, Kij, Pij, Sij or Wij. Derivation of network form of K-K equations for homogeneous ternary non-electrolyte solutions containing Peusner's coefficients Lij (i, j element of {1, 2, 3}) creating a the third- order matrix of Peusner's coefficients [L] and the calculation of the Peusner's coefficients Lij and comparison these coefficients with coefficient Rij presented in the first part of the paper (Polim. Med.). A cellulose acetate hemodialysis membrane (Nephrophan) with known parameters for the transport of aqueous solutions of glucose and ethanol was a research material. Our research method was the PNT formalism and K-K equation for ternary non-electrolyte solutions. The network form of K-K equations for ternary solution consisting of solvent and two dissolved substances was obtained. Dependences of Peusner's coefficients Lij (i, j element of {1, 2, 3}) on the average concentration of one component of solution in the membrane (C1) with a constant value of second component (C1) were calculated in the conditions of solution homogeneity. These coefficients can be calculated on the basis of based on experimentally determined transport parameters i.e. the hydraulic permeability coefficients (Lp), solute permeability (omega) and reflection (sigma). Network form of K-K equations containing Peusner's coefficients Lij (i, j element of {1, 2, 3}) can be used for examination of the membrane transport. The calculations showed that only coefficients L12, L22, L23 i L32 are sensitive to the concentration and composition of the solutions separated by the polymer membrane.


Peusner's network thermodynamics (PNT) enables symmetrical or hybrid transformation of membrane transport equations. For Kedem-Katchalsky equations (K-K) these transformations create the network form of these equations that contain new types of coefficients which can be calculated from the experimentally determined transport parameters, such as hydraulic permeability coefficient (Lp), solute permeability (omega) and reflection (sigma). For ternary and homogeneous solutions of non-electrolytes, transformations result in two symmetrical and six hybrid K-K network equations. The symmetrical forms of K-K network equations contain Peusner's coefficients Rij or Lij, whereas hybrid forms of K-K network equations contain Peusner's coefficients Hij, Nij, Kij, Pij, Sij or Wij. Derivation of network form of KK equations for homogeneous ternary solutions that contain nonelectrolytes Peusnera ratios Rij (i, j element of {1, 2, 3}) presented in the third-order matrix [R]. Evaluation of transport properties of the membrane using Peusner's coefficients Rij, the determinant of the matrix [R], somber elements belonging to Rij, quotients Rij/det [R] and quotients det [Rij]/det [R]. A cellulose acetate hemodialysis membrane (Nephrophan) of known parameters for transport of aqueous glucose and ethanol solutions of was a research material. The PNT formalism and K-K equation for ternary nonelectrolyte solutions were a research tool in this paper. The network form of K-K equations for ternary solutions was presented, that was obtained using the symmetric transformation of Peusner's thermodynamic networks. The resulting equations were used to interpret the transport of nonelectrolytes solutions consisting of solvent and two solutes. We calculated dependences of Peusner's coefficients Rij (i, j element of { 1, 2, 3}) and det [R] from the average concentration of one component of solution in the membrane (C1) with a constant value of a second component (C2) in conditions of solutions homogeneity. We also calculated dependencies of minors belonging to the elements Rij, the quotients Rij/det [R] and quotients det [Rij]/det [R] on the average concentration of one component of solution in the membrane (C1) at a constant value of the second component (C2). Network form of K-K equations containing Peusner's coefficients Rij (i, j element of {1, 2, 3}) is a novel tool suitable for the examination of the membrane transport. The presented calculations showed that the values of coefficients R11, R21, R22, R23 and R13 are sensitive to the composition and concentration of the solutions separated by a polymer membrane.


Suchy P.,Uzdrowisko Goczalkowice Zdroj Spolka Z O.o. | Dabrowska D.,University laski | Kucharski R.,University Ekonomiczny
Przeglad Geologiczny | Year: 2015

The article presents the assessment of the groundwater quality trend on the example of chlorides in the region of Goczałkowice Zdrój health resort. The data from the years 1977-2014 from two boreholes: GN-1, GN-2 were analysed. The trend assessment was made using the linear model, the fixed effect model and the robust statistic. The residts of these methods indicate a downward trend of chlorides concentration.

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