Results of mercury sorption from aqueous solutions on DG1-3+S activated carbon in a fixed-bed sorption column are presented. On the basis of break-through curves obtained in different process conditions the influence of flow direction, solution flow rate, temperature and pH on the sorption capacity and kinetics was defined. The results should enable a proper design of the great scale bioreactor for mercury bioremediation.
A new technology for mercury removal from industrial wastewaters by the microbiological method and the relevant pilot-plant process line are described. Modifications of the apparatus and some experimental results leading to the improvement of bioremediation technology in a full industrial scale are presented.
This paper presents a data acquisition system for sensor array based on metal oxide resistive gas sensors. The constructed system consist of measuring modules linked to an efficient Cortex™ - M3 ARM core microcontroller and a CAN bus. Each module is divided into an analog measuńng part connected to a digital part containing microcontroller and other peripheries. In the experiment six gas sensors and an integrated humidity and temperature sensor were connected to seven modules forming a network based on CAN bus. Authors proposed this solution not only as a system for detection and monitoring purposes but also as a base to construct an electronic nose.
PL
W publikacji zaprezentowano układ akwizycji danych z matrycy czujników, w której zastosowano rezystancyjne czujniki gazu. Skonstruowany układ składa się z modułów pomiarowych na bazie mikrokontrolera z wydajnym rdzeniem ARM Cortex™ - M3 połączonych z magistralą CAN. Każdy z modułów jest podzielony na analogową część pomiarową połączoną z częścią cyfrową zawierającą mikrokontroler i inne układy peryferyjne. W eksperymentalnym układzie wykorzystano sześć czujników gazów oraz minimalizację wykonaną dla każdej funkcji oddzielnie oraz metod dekompozycyjnych przedstawionych w poprzednich pracach.
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TiO₂:Au nanocermets and TiO₂ thin films covered with gold precipitates were obtained from RF reactive sputtering of mosaic Au:Ti or metallic Au targets. The influence of gold content, deposition temperature and post-deposition annealing on photoanodic behaviour and the structure of the obtained materials was examined by optical, structural and electrochemical measurements.
Thin films of tin dioxide modified by metallic additives such as Ti and W were deposited by rf reactive sputtering from mosaic targets. The influence of substrate temperature on the film crystallization and surface roughness was studied by means of Grazing Incidence Diffraction (GID), Atomic Force Microscopy (AFM) and light scattering experiments. The electrical measurements were performed in the temperature range 473÷773 K under reducing gases (hydrogen) in the concentration range 100÷10000 ppm.the sensor parameters such as sensitivity and signal stability were found to be affected by the film microstructure (grain size, the amount of the amorphous phase, surface roughness) and metallic additives.
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This article shows the results of the households' income and expenditures analysis. Special attention was given to the relation between food and alcohol-free beverages in general expenditures and social-demographic characteristics. Three criteria of households' division were introduced. The households were divided according to the main source of maintenance, according to number of members in the household, according to the economic situation. As a result of these steps we got 18 households subsets. For each subset the linear econometric models were estimated and verified. These models illustrate the Engel's Law. In the next step of analysis the classification rules were generated with use of data mining techniques. Data mining analysis was made for the same subsets as previously econometric models. As an output we got the rules with economic interpretation, allowing for complement of households' characteristics resulting from research based on econometric techniques.
W pracy badano korelację pomiędzy strukturą i składem chemicznym a odpowiedzią sensorów na bazie nanokompozytów SnO₂/TiO₂. Materiały o różnym stosunku molowym uzyskano poprzez mechaniczne mieszanie komercyjnie dostępnych nanoproszków. Charakterystyki sensorowe dla H₂ mierzono w zakresie temperatur 200...400°C i koncentracji 50...3000 ppm, a dla NH₃ w temperaturze 500°C w zakresie koncentracji 500...4500 ppm. Najwyższe odpowiedzi uzyskano dla nanokompozytów o zawartości 50% molowych TiO₂.
EN
Correlation between structure, chemical composition and sensor response is studied. Nanocomposites of SnO₂/TiO₂ with different molar contents have been obtained by mechanical mixing of commercial nanopowders. Sensors characteristics have been recorded over temperature and gas concentration ranges of 200...400°C and 50...3000 ppm, respectively, for H₂ while detection of NH₃ has been carried out at 400°C and 500°C from 500 ppm to 4500 ppm. The highest sensor response to both hydrogen and ammonia occurs at 50 mol% TiO₂/50 mol% SnO₂.