Penczak T.,University of LodA
Oceanological and Hydrobiological Studies | Year: 2013
Researchers continuously search for adequate and inexpensive fish sampling methods and, as such, it is worth remembering the quantitative seine method with three identical nets hauled individually towards a stop net or a bank. A sample obtained by three nets is the absolute minimum for any accurate estimate employing a removal technique, and this procedure provides an estimate of density with a known error, because it allows for calculations of the variance value. Density (the number of individuals calculated from the model, as per defined area or volume), a popular term in the previous century when a secondary production and bioenergetics budget studies were considered to be modern investigations, but now when it is used with different meanings, an attempt has to be undertaken to sort out this terminology. © 2013 Versita Warsaw and Springer-Verlag Wien.
Szyprowski M.,Warsaw University of Technology |
Kerntopf P.,Warsaw University of Technology |
Kerntopf P.,University of LodA
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013
Optimal synthesis of reversible circuits is a very hard task. For example, up to year 2009 this problem had not been solved even for 4-bit reversible functions, in spite of intensive research during previous decade. In 2010, a method and a tool of practical usage for finding optimal circuits for any 4-bit reversible specification were finally developed. Namely, with sophisticated optimizations it was possible to find gate count optimal circuits for any 4-bit reversible function built from multi-control Toffoli gates. Last year, we published an extension to the algorithm, which allows to reduce the quantum cost of the resulting circuits. In this paper we present another extension to this approach. Namely, we have extended the reversible gate library to mixed-polarity multi-control Toffoli gates (i.e. with both positive and negative controls). Our experimental results for the known reversible benchmarks show that using mixed-polarity Toffoli gates gives significant savings in gate count. The paper presents results of different computational experiments including optimal 4-bit circuits for the known reversible benchmarks with respect to both gate count and quantum cost criteria. © 2013 Springer-Verlag Berlin Heidelberg.
Skowron M.,University of LodA |
Zakrzewski R.,University of LodA |
Ciesielski W.,University of LodA |
Rembisz A.,University of LodA
Journal of Planar Chromatography - Modern TLC | Year: 2014
A simple and sensitive thin-layer chromatographic (TLC) method coupled with an image analysis technique was developed for the quantitative determination of disulfiram. Separation was performed on RP-18 plates with methanol-water 90:10 (v/v) as mobile phase. Disulfiram was detected using copper(II) ions (producing a yellow complex). Digital images of TLC plate chromatograms were converted into peak chromatograms using TLSee software, and quantitative analysis was conducted. Linearity was obtained in the range of 1.0-10 μg/spot. The limits of detection and quantification were 0.26 μg/spot and 0.86 μg/spot, respectively. Quantitative determination of disulfiram in Anticol was also performed, with a recovery of 100.3%. The method was applied for the determination of disulfiram in a urine-spiked sample.