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Number of results: 30
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Abstract

The aim of this work was to produce a thin SnO2 film by a technique combining the sol-gel method and electrospinning from a solution based on polyvinylpyrrolidone and a tin chloride pentahydrate as a precursor. The spinning solution was subjected to an electrospinning process, and then the obtained nanofiber mats were calcined for 10 h at 500°C. Then, the scanning electron microscopy morphology analysis and chemical composition analysis by X-ray microanalysis of the manufactured thin film was performed. It was shown that an amorphous-crystalline layer formed by the SnO2 nanofiber network was obtained. Based on the UV-Vis spectrum, the width of the energy gap of the obtained layer was determined.

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Authors and Affiliations

W. Matysiak
T. Tański
W. Smok
S. Polishchuk
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Abstract

Trinexapac-ethyl is one of the newest growth regulators used in agriculture and horticulture. As a most growth retardants it acts by inhibiting gibberellin (GA) biosynthesis. A field study was conducted to determine the effects of trinexapac-ethyl on growth of winter wheat. Trinexapac ethyl was used alone (75 g a.i./ha and 125 g a.i./ha) and in the mixture with chlorocholine chloride (50 g a.i./ha + 675 g a.i./ha) at the 2nd node stage. Trinexapac-ethyl and its mixture with CCC activity was weather dependent. Their influence on the crop was strictly related to the temperature and rainfall during an individual year of trials. Plant growth regulators much more influenced winter wheat plants in abundant rainfall and higher temperature conditions. Lodging was not observed during the experiment.

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Authors and Affiliations

Kinga Matysiak
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Abstract

The Poznań Branch of the PAN Archive in Warsaw was established in May 1956. From April 1974, the headquarters of the Branch was located in the building of the Poznań Society of Friends of Sciences in Poznań. The Archive collects, processes and makes available archival materials on the activities of the Polish Academy of Sciences and legacies of scholars. The legacies that form the backbone of archival resources are gathered through purchases, donations and deposits. Then they are compiled in the form of inventories and made available for research purposes. The collections of the Archive of the Polish Academy of Sciences in Poznań contain rich documentation of the history of science in Poznań and in Poland. They concern both scientific institutions, including laboratories, editorial offices and some institutes of the Polish Academy of Sciences, the University of Adam Mickiewicz in Poznań and other Poznań universities, as well as biographies of individual scientists, especially those connected to Poznań and Greater Poland. Archival collections with valuable materials related to groundbreaking events in the post-war history of Poznań and Poland are also interesting. Archival collections are also displayed at exhibitions and during scientific conferences. Archives from two legacies are available on the CYRYL portal – the Poznań Local Digital Repository.
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Authors and Affiliations

Jarosław Matysiak
1

  1. PAN Archiwum w Warszawie Oddział w Poznaniu
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Abstract

Constantly developing nanotechnology provides the possibility of manufacturing nanostructured composites with a polymer matrix doped with ceramic nanoparticles, including ZnO. A specific feature of polymers, i.e. ceramic composite materials, is an amelioration in physical properties for polymer matrix and reinforcement. The aim of the paper was to produce thin fibrous composite mats, reinforced with ZnO nanoparticles and a polyvinylpyrrolidone (PVP) matrix obtained by means of the electrospinning process and then examining the influence of the strength of the reinforcement on the morphology and optical properties of the composite nanofibers. The morphology and structure of the fibrous mats was examined by a scanning electron microscope (SEM) with an energy dispersive spectrometer (EDS) and Fourier-transform infrared spectroscopy (FTIR). UV –Vis spectroscopy allowed to examine the impact of zinc oxide on the optical properties of PVP/ZnO nanofibers and to investigate the width of the energy gap.

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Authors and Affiliations

W. Matysiak
T. Tański
M. Zaborowska

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