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Superplasticizer compatibility problem with innovative air-entraining multicomponent Portland cement
No full textNowe technologie w wyszukiwaniu, pozyskiwaniu i archiwizowaniu wiedzy. Studium przypadku
No full textMathematica notebook and PDF to: Description and visualization of large deformations of continuum with Mathematica
No full textOne of the most difficult problems in undestanding mechanics of large deformation of the continuum are ability of students and engineers (also those with professor titles) to deal with continuum as a curved space due to large deformations. There are many misunderstanding in many books on Continuum Mechanics connected with disability with dealing with curvilinear systems of coordinates. The most useful educational method of explaining problems for engineers is 3D animated graphics. Mathematica with its tools of dealing with vectors, tensors and interactive visualization makes it possible to override this perception problem. Application of Manipulate function and graphical facilities of Mathematica makes it possible to understand many aspects of deformation description like differences between Gausian and Lagrangian coordinates, reference and actual configuration. Mathematica notebook and PDF to: Description and visualization of large deformations of continuum with MathematicaOne of the most difficult problems in undestanding mechanics of large deformation of the continuum are ability of students and engineers (also those with professor titles) to deal with continuum as a curved space due to large deformations. There are many misunderstanding in many books on Continuum Mechanics connected with disability with dealing with curvilinear systems of coordinates. The most useful educational method of explaining problems for engineers is 3D animated graphics. Mathematica with its tools of dealing with vectors, tensors and interactive visualization makes it possible to override this perception problem. Application of Manipulate function and graphical facilities of Mathematica makes it possible to understand many aspects of deformation description like differences between Gausian and Lagrangian coordinates, reference and actual configuration. Mathematica notebook and PDF to: Description and visualization of large deformations of continuum with Mathematic
The role of structural and electronic factors in shaping the ambipolar properties of donor-acceptor polymers of thiophene and benzothiadiazole
No full textThe influence of different thiophene donor units on electrochemical and spectroscopic properties of benzothiadiazole based donor–acceptor π-conjugated organic materials is studied. Two different structure modification vectors of the donor units are being considered – one addressing the intermolecular interactions through off-conjugation side chain architecture, and the other focusing on intramolecular interactions tuned by in-conjugation substituents. Electrochemical and simultaneous in situ EPR-UV-Vis-NIR spectroelectrochemical studies of the oxidative (p-) and reductive (n-) doping processes, which are responsible for the optoelectronic properties of these materials, revealed their disparate course and dissimilar effects of redox reactions of the conjugated π-bond. While p-doping prevalent species were found to comprise intensively interacting spin bearing and spinless charge carriers, the n-doping state was found to involve only one type of negatively charged carrier, with spin carrying species being selectively generated at due cathodic potentials. No spin pairing of these negative polarons was observed with their increasing population behaving like a collection of localised charge carriers. Qualitative and quantitative comparisons between the p- and n-doping carrier populations provided independent support for the spin pairing phenomena of positive charge carriers. Steric effects of varying alkyl side chain substitution have demonstrated predominant impact on the electrochemical properties of investigated polymers, and, thereto related, stability of n-doped state, while mesomeric effects of different 3,4-ethylenechalcogenide thiophene functionalities have been found to shape the energy level related spectral properties of these polymers, with particular reference to p-doping induced charged states. These findings provide new insights into the factors requiring attention during structure tailoring of donor–acceptor assemblies for organic optoelectronic applications.The influence of different thiophene donor units on electrochemical and spectroscopic properties of benzothiadiazole based donor–acceptor π-conjugated organic materials is studied. Two different structure modification vectors of the donor units are being considered – one addressing the intermolecular interactions through off-conjugation side chain architecture, and the other focusing on intramolecular interactions tuned by in-conjugation substituents. Electrochemical and simultaneous in situ EPR-UV-Vis-NIR spectroelectrochemical studies of the oxidative (p-) and reductive (n-) doping processes, which are responsible for the optoelectronic properties of these materials, revealed their disparate course and dissimilar effects of redox reactions of the conjugated π-bond. While p-doping prevalent species were found to comprise intensively interacting spin bearing and spinless charge carriers, the n-doping state was found to involve only one type of negatively charged carrier, with spin carrying species being selectively generated at due cathodic potentials. No spin pairing of these negative polarons was observed with their increasing population behaving like a collection of localised charge carriers. Qualitative and quantitative comparisons between the p- and n-doping carrier populations provided independent support for the spin pairing phenomena of positive charge carriers. Steric effects of varying alkyl side chain substitution have demonstrated predominant impact on the electrochemical properties of investigated polymers, and, thereto related, stability of n-doped state, while mesomeric effects of different 3,4-ethylenechalcogenide thiophene functionalities have been found to shape the energy level related spectral properties of these polymers, with particular reference to p-doping induced charged states. These findings provide new insights into the factors requiring attention during structure tailoring of donor–acceptor assemblies for organic optoelectronic applications
Recenzja rozprawy doktorskiej mgr inż. Aldony Rosner pt. Multi-instrumental automatic recognition of musical genres
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Recenzja rozprawy doktorskiej mgra inż. Pawła Rochnińskiego pt. Zastosowanie metod korelacyjnych w dokładnych pomiarach napięć przemiennych
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