Národní úložiště šedé literatury Nalezeno 3 záznamů.  Hledání trvalo 0.00 vteřin. 
Double layer humidity sensor based on phthalocyanine derivatives
Rakušan, J. ; Karásková, M. ; Hamáček, A. ; Řeboun, J. ; Kubáč, L. ; Černý, J. ; Rais, David ; Nešpůrek, Stanislav
New type of humidity sensors based on double layer structure consisting of hydrophilic and hydrophobic phthalocyanine derivatives is presented. The sensor shows high sensitivity in the range from 20 to 90 % relative humidity (RH), good long-time stability and fast response. The impedance change vs. RH is quasi-linear in semilogarithmic plot and fully reversible.
Humidity sensor based on TiO2 nanoparticles and sodium salt of sulfonated AlOH phthalocyanine
Rakušan, J. ; Karásková, M. ; Hamáček, A. ; Řeboun, J. ; Rais, David ; Nešpůrek, Stanislav
New type of humidity sensor based on TiO2 nanoparticles and sodium salt of sulfonated AlOH phthalocyanine is presented. The sensor shows high sensitivity due to the high surface area of TiO2 nanoparticles, good long-time stability and sensitivity in the range from 20 to 80 % RH. The response is linear in semilogarithmic plot – logarithm of impedance vs. RH and fully reversible.
Detection of Elliptical Particles in Atomic Force Microscopy Images
Sedlář, Jiří ; Zitová, Barbara ; Kopeček, Jaromír ; Todorciuc, T. ; Kratochvílová, Irena
In this paper we describe a method for detection and measurement of elliptical particles in atomic force microscopy (AFM) images. AFM imaging is used in physics to scan surfaces; the measured heights are represented by pixel values. Each sample in our project consisted of elliptical particles of principally the same size; the size could be characterized by the average length and width of a number of salient particles. The method we proposed is based on segmentation of undamaged particles and their approximation by ellipses; the major and minor axes provide robust estimates of the lengths and widths of the particles, respectively. The method is robust to distortions typical of AFM images. Its performance was demonstrated on images of pyrroles and compared with manual detection. Results show that the automatic method could be used in place of the time-consuming manual detection.

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