Wyniki wyszukiwania - BazTech

1

Electronic realizations of fractional-order elements: II. Simulation studies

Jakubowska A., Szymczak M.

Poznan University of Technology Academic Journals. Electrical Engineering

|

2016

|

No. 85

149--159

EN

The paper presents simulation studies on the synthesis of new fractional-order elements, using classic fractional-order components, such as supercapacitors and real coils with ferromagnetic cores. These new fractional-order elements have been realized using a generalized impedance converter GIC. Firstly, a new method for fractional-order elements modeling in PSpice has been described, which involves the use of controlled voltage E or current G sources, defined in Analog Behavioral Modeling (ABM). An equivalence of the classic and proposed description of the fractional-order capacitor have been presented. For the GIC structure, two cases of the have been analyzed in the PSpice: first, with models of ideal operational amplifiers, modeled as controlled voltage sources, and the second with models of the real operational amplifiers, of type OPA549. The obtained frequency characteristics of an exemplary GIC structure with one fractionalorder element show big similarity for both types of models. The impact of different values of the parameter α and the type of the used real amplifier on the solution has been analyzed too.

2

Electronic realizations of fractional-order elements: I. Synthesis of the arbitrary order elements

Jakubowska A., Walczak J.

Poznan University of Technology Academic Journals. Electrical Engineering

|

2016

|

No. 85

137--148

EN

The paper presents a synthesis method of new fractional-order elements, using classic fractional-order components, such as supercapacitors and real coils with ferromagnetic cores. These new fractional-order elements have been realized using a generalized impedance converter GIC. Two cases have been analyzed in the paper: first, with only one fractional-order element being a load impedance of the generalized impedance converter, and second, with two fractional-order elements - one being a part of the structure of the GIC and the second being the load impedance. The derived relations are illustrated by simulation examples for the circuit. The impact of different values of the parameter α on the solution of the considered problem has been analyzed too.

3

Synthesis and electrochemical investigation of novel graphite bi-intercalation systems

Skowroński J. M., Urbaniak J.

Karbo

|

2001

|

Nr 11

397-399

EN

Successful trial was conducted of synthesis of two new bi-intercalation compounds: ZnCl2-FeCl3-fiZG and ZnCl(2)-FeCl(3)-H(2)SO(4)-BZG. ZnCl(3)-IZG with intercalation stage n = 5 was selected as initial compound, characterised by a great admixture of a pure graphite phase. Synthesis of ZnCl(2) was conducted in 4,8 M, solution of FeCl(3) in nitro-methane. The method of X-ray diffraction analysis served for determination of the structure of the originated compound.

PL

Przeprowadzono udaną próbę syntezy dwóch nowych związków bi-interkalacyjnych: ZnCl(2)-FeCl(3)-BZG oraz ZnCl(2)-FeCl(3)-H(2)SO(4)-BZG. Jako związek wyjściowy wybrano ZnCl(2)-IZG o stadium interkalacji n = 5, charakteryzujący się dużą domieszką fazy czystego grafitu. Syntezę ZnCl(2)-FeCl(3)-BZG prowadzono w 4,8 M roztworze FeCl(3) w nitro-metanie. Metoda dyfrakcyjnej analizy rentgenowskiej posłużyła do określenia struktury powstałego związku.

4

Exfoliation of CrO3-GIC as a route to novel graphite composites

Skowroński J. M., Walkowiak M.

Karbo

|

2001

|

Nr 11

400-403

EN

Intercalation compound of graphite with chromium trioxide was used as a precursor for obtaining of a novel type of graphite composites. Heating it at temperature of up to 800°C in air resulted in obtaining of composite material of expanded graphite/Cr(2)O(3) type. Whereas further treatment of this composite at the temperature of 1000°C in the stream of hydrogen with argon lead the transformation of Cr(2)O(3) into chromium carbide and origination of a composite of expanded graphite/Cr(3)C(2) type.

PL

Interkalacyjny związek grafitu z trójtlenkiem chromu został użyty jako prekursor w procesie otrzymywania nowego typu kompozytów grafitowych. Ogrzewając go do temperatury 800°C w powietrzu otrzymano materiał kompozytowy typu ekspandowany grafit/Cr(2)O(3), natomiast dalsze ogrzewanie tego kompozytu w temperaturze 1000°C w strumieniu wodoru z argonem spowodowało redukcję Cr(2)O(3) do węglika chromu i powstanie kompozytu typu ekspandowany grafit/Cr(3)C(2).