Scale-free properties of board and director networks quantities

It is often claimed that corporate and board networks display a scale-free nature, but there is no robust support for this nature. Based on data concerning the corporate board and director networks from companies listed on the Warsaw Stock Exchange Market, we applied a rigorous approach to determine whether quantities of these networks, such as degree, board size, and directorship number, exhibit power-law distribution

Kinetyka adsorpcji chloroorganicznych zanieczyszczeń wody z roztworów wieloskładnikowych na węglu aktywnym

A comparative study of adsorption kinetics in the systems multicomponent aqueous solutions of selected chlorophenols (2-CP, 3-CP, 4-CP) and chlorophenoxy herbicides (2,4-D, MCPA) - activated carbon (F-300) has been performed. The concentrations of all adsorbates in the aqueous phase were determined using high performance liquid chromatography (HPLC). The applicability of two kinetic models, the pseudo-first and pseudo-second order models, for the experimental data was examined. The adsorption kinetics was better described by the pseudo-second order model with correlation coefficients R2 ≥ 0.997 for all adsorbates.Wykonano badania porównawcze szybkości adsorpcji z wieloskładnikowych wodnych roztworów wybranych chlorofenoli (2-CP, 3-CP, 4-CP) i herbicydów chlorofenoksyoctowych (2,4-D, MCPA) na granulowanym węglu aktywnym (F-300). Stężenia wszystkich adsorbatów w fazie wodnej oznaczano za pomocą wysokosprawnej chromatografii cieczowej (HPLC). Zbadano przydatność dwóch modeli kinetycznych: pseudopierwszego i pseudodrugiego rzędu do opisu wyników eksperymentalnych. Uzyskane rezultaty pokazują, że kinetykę adsorpcji lepiej opisuje równanie pseudodrugiego rzędu, co potwierdziły większe wartości współczynnika korelacji dla wszystkich adsorbatów (R2 ≥ 0,997)

Application of scanning shear-force microscope for fabrication of nanostructures

In view of the rapid growth of interest in AFM technique in surface property investigation and local surface modification we describe here an AFM microscope with optical tip oscillation detection. The modular shear-force/tunneling microscope for surface topography measurement and nanoanodisation is described. The measurement instrument presented here is based on the fiber Fabry-Perot interferometer for the measurement of the conductive microtip oscillation that is used as nano e-beam for local surface anodisation. An advantage of this system is that quantitative measurements of tip vibration amplitude are easily performed

Wide-band optical fibre system for investigation of MEMS and NEMS deflection

In this work the construction of experimental setup for MEMS/NEMS deflection measurements is presented. The system is based on intensity fibre optic detector for linear displacement sensing. Furthermore the electronic devices: current source for driving the light source and photodetector with wide-band preamplifier are presented