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Search results for: JONIZACJA SOLI
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Potentiometric Solid-Contact Multisensor System for Simultaneous Measurement of Several Ions
PublicationThe design and performance of potentiometric multisensor system made in solid-contact technology is described. Both, the measuring electrodes as well as the reference electrode are in a compact cell. The system allows for simultaneous measurement of various ions. The characteristics of the electrodes for Na+, K+ and Ca2+ ions were determined using the designed system and compared with ISEs of the same membrane composition in classical...
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Numerical simulation of screw displacement pile interaction with non-cohesive soil
PublicationA trial numerical simulation of screw displacement pile interaction with non-cohesive subsoil during the transfer of compression load. The simulation was carried out in an axisymmetric system. The technological phases of pile installation in the ground were numerically modelled using equivalent processes which provided similar effects to real technical actions. The results of the numerical calculations were verified by comparing...
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Smooth Particle Hydrodynamics (SPH) approach in simulating large penetration into soil
PublicationA study of Smooth Particle Hydrodynamics (SPH) approach for predicting large soil deformation is presented. Theoretical basics of SPH method, including the equations governing, discussion of the importance of smoothing function length, contact formulation, boundary treatment and finally utilization in hydrocodes simulations are presented. An application of SPH to a real case of large penetrations (crater creating) into soil caused...
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RARE-EARTH ELEMENTS DOPING OF BARIUM CERATE AND ZIRCONATE SOLID SOLUTION
PublicationThe properties of doped barium cerate barium zirconate solid solution are presented in presented work. It was found that doping of solid solution of barium cerate and zirconate by rare-earth elements have an influence on microstructure and electrical properties of the samples.
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FURTHER REMARKS ON THE SURFACE VIS IMPRESSA CAUSED BY A FLUID-SOLID CONTACT
PublicationIt is well-known that, nano-mechanics should take into account not only physical phenomena occuring within the bulk but, first of all, the physical phenomena appropriate for a surface of two materials contact. The huge volume density of internal surfaces as well countours lines located within the nanomaterial results in our interest in, apart from classical form of mass, momentum and entropy transport, those modes of transportation...
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Interface layers between electrolyte and cathodes for solid oxide fuel cells
PublicationW pracy przebadano możliwość zastosowania warstwy CGO ((CeO2)0.8 (Gd2O3)0.1) w tlenkowych ogniwach paliwowych. Do wytworzenia warstwy użyto pirolizy aerozolowej.
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Infiltration - an alternative method to prepare composites for Solid Oxide Fuel Cells
PublicationPrzedstawiono różne techniki nasączania pozwalające na uzyskanie materiałów o mieszanym przewodnictwie jonowo-elektronowym do zastosowań w tlenkowych ogniwach paliwowych
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Thin Layer Deposition Methods in Solid Oxide Fuel Cell Technology
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Detection and classification of gaseous compounds by solid electrolyte cyclic voltammetry sensors
PublicationW pracy omówiono właściwości i ostatnie wyniki badań dotyczące czujników elektrokatalitycznych.
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Impedance Spectroscopy as a Diagnostic Tool of Degradation of Solid Oxide Fuel Cells
Publicationw pracy przedstawiono wyniki badań degradacji tlenkowych ogniw paliwowych przeprowadzone metodą spektroskopii impedancyjnej. Ogniwa paliwowe zostały przetestowane w eksperymentalnych warunkach, które pozwalają na uzyskanie szybkiego spadku wydajności ogniw paliwowych. impedancja i parametry uzyskane z dopasowania widm do elektrycznego obwodu zastępczego zostały skorelowane z poziomem degradacji elementów ogniw paliwowych - anody...
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Description of the silo flow and bulk solid pulsations detection using ECT
PublicationW artykule przedstawiono wyniki zastosowania tomografii pojemnościowej do analizy pulsacji występujących w bezkohezyjnym materiale sypkim podczas opróżniania silosu cylindrycznego. Przeanalizowano wpływ parametrów zmiennych (zagęszczenia początkowego, szorstkości ściany, prędkości opróżniania) na wielkość dynamicznych pulsacji)
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Uwagi o roli matematyki w walce o przewagę konkurencyjną.
PublicationAutor podejmuje kwestię znaczenia różnych form zewnętrznej oceny jakości kształcenia dla jej stymulacji. Wskazuje na wiele luk, które występują między oczekiwaniami pod adresem jakości studiów a rzeczywistym jej poziomem. Dla podniesienia jakosci niezbędne jest zwiększenie liczby godzin zajęć dydaktycznych z zakresu matematyki i podniesienie autorytetu tego przedmiotu na kierunkach studiów ekonomicznych.
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Wzmacnianie i uszczelnianie gruntu metodą mieszania in situ (Soil Mixing).
PublicationAktualny stan rozwoju różnych metod mieszania gruntu, łącznie z charakterystyką używanych maszyn i stosowanego wykonawstwa oraz podsumowaniem doświadczeń. Główne obszary zastosowania oraz podejście projektowe. Aplikacje związane z posadowieniem obiektów drogowych i budowlanych oraz uszczelnianiem gruntu Wybrane przykłady realizacji.
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Molekularny mechanizm biogenezy fimbrii Dr uropatogennych szczepów Escherichia coli.
Publication.
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A review of theoretical and practical aspects of solid-phase microextraction in food analysis.
PublicationSPME (mikroekstrakcja do fazy stacjonarnej) to szybka, nowoczesna technika przygotowania próbki do analizy. W niniejszej pracy dokonano przeglądu zastosowania techniki SPME do badania zanieczyszczeń żywności i analizy jej naturalnych składników. Praca zawiera również krótki teoretyczny opis zasad działania techniki SPME.
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Extraction of acidic herbicides from soil by means of accelerated solvent extraction.
PublicationZaprezentowano opracowanie procedury izolacji herbicydów kwasowych z gleby z zastosowaniem urządzenia DIONEX ASE 200. Celem było zoptymalizowanie warunków pracy urządzenia: czasu, temperatury, ciśnienia oraz ilości cykli ekstrakcji. Ostatecznie ekstrakty, po przeprowadzeniu analitów w pochodne metylowe, poddano analizie chromatograficznej (GC).
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Analysis of pounding between adjacent buildings founded on different soil types
PublicationEarthquake-induced pounding was experienced in many previous earthquakes and it was found to be a critical issue. This study investigates the effect of pounding between buildings founded on the same and different soil types. Three 3-D buildings with 4, 6 and 8 storeys were considered in this study. Three pounding scenarios were taken into account, i.e. pounding between 4-storey and 6-storey buildings, between 4-storey and 8-storey...
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Pounding between high-rise buildings founded on different soil types
PublicationEarthquake-induced pounding is a phenomenon that has been often experienced in previous earthquakes. The aim of this study is to investigate the effect of the soil type on high-rise buildings experiencing earthquake induced-pounding. Pounding between 7-storey and 9-storey buildings is examined under five soil types defined in the ASCE 7-10 code which are hard rock, rock, very dense soil and soft rock, stiff soil and soft clay soil....
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Influence of Escherichia coli on Expression of Selected Human Drug Addiction Genes
PublicationThe impact of enteric microflora on the expression of genes associated with cocaine and amphetamine addiction was described. Human genome-wide experiments on RNA transcripts expressed in response to three selected Escherichia coli strains allowed for significant alteration (p > 0.05) of the linear regression model between HT-29 RNA transcripts associated with the KEGG pathway:hsa05030:Cocaine addiction after 3 h stimulation with...
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Checkpoints that regulate balanced biosynthesis of lipopolysaccharide and its essentiality in Escherichia coli
PublicationThe outer membrane (OM) of Gram-negative bacteria, such as Escherichia coli, is essential for their viability. Lipopolysaccharide (LPS) constitutes the major component of OM, providing the permeability barrier, and a tight balance exists between LPS and phospholipids amounts as both of these essential components use a common metabolic precursor. Hence, checkpoints are in place, right from the regulation of the first committed step...
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A systematic review on cellular responses of Escherichia coli to nonthermal electromagnetic irradiation
PublicationInvestigation of Escherichia coli under electromagnetic fields is of significance in human studies owing to its short doubling time and human‐like DNA mechanisms. The present review aims to systematically evaluate the literature to conclude causality between 0 and 300 GHz electromagnetic fields and biological effects in E. coli. To that end, the OHAT methodology and risk of bias tool were employed. Exponentially growing cells exposed...
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Triplet exciton interactions in solid films of an elektrophosphorescent Pt(II) porphyrin
PublicationW pracy pokazano, że fosforescencja porfiryny platynowej (PtOEP) jest wygaszana na skutek oddziaływania między monomerowymi i dimerowymi ekscytonami trypletowymi. Stała oddziaływania dla monomerowych ekscytonów trypletowych wynosi 8x10-12 cm3/s a dla ekscytonów dimerowych 8x10-15 cm3/s.
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Properties of a lithium solid electrolyte gas sensor based on reaction kinetics
PublicationW artykule przedstawiono zasadę działania, budowę i właściwości czujnika gazu na bazie elektrolitu stałego z mobilnymi jonami litu. Czujnik został przygotowany w technologii grubowarstwowej. Przedstawiono wyniki badań czujnika w mieszaninach gazów toksycznych.
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Influence of soil anisotropic stiffness on the deformation induced by an open pit excavation.
PublicationIn this paper, the problem of deformation induced by an open pit excavation in anisotropic stiff soils is analysed by FE modelling. The presented research is focused on the influence of material model with anisotropic stiffness on the accuracy of deformation predictions as compared with the field measurements. A new hyperelastic-plastic model is applied to simulate anisotropic mechanical behaviour of stiff soils. It is capable...
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Chapter 18. Emulsifying properties of nonionic surfactants in the context of soil remediation
PublicationPowstające podczas remediacji gruntów emulsje są niekorzystne, gdyż mogą prowadzić do zatykania porów i unieruchomienia strumienia cieczy przemywającej. Czyni to proces przemywania nieefektywnym. Zbadano stabilność emulsji trzech olejów mineralnych i jednego syntetycznego (PAO 6). W badaniach wykorzystano aparat Turbiscan TLab Expert. Stabilność emulsji określono jako zależność delty transmisji od czasu. Spośród przebadanych emulsji...
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Analysis of floor-to-column pounding of buildings founded on different soil types
PublicationThe aim of this study is to investigate the effect of the soil type on buildings experiencing floor-to-column pounding during earthquakes. Five buildings with 4-storeys, 6-storeys, and 7-storeys were considered. Three types of the 4-storey building with different total heights were taken into account which leads to floor-to-column pounding at 1/3, 1/2 and 2/3 of the height of the impacted column. Two pounding scenarios were considered,...
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Effect of interconnect coating procedure on solid oxide fuel cell performance
PublicationChromium (Cr) species vaporizing from chromia-forming alloy interconnects is known as a source of degradation in solid oxide fuel cell (SOFC) stacks called “cathode poisoning”. (Mn,Co)3O4 spinel coatings offer good protection against Cr evaporation during operation. In this study, Crofer 22 APU steel interconnects were electrophoretically deposited in different mediums to obtain high packing of green coating layer. The optimized...
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Preparation and characterization of asphaltene based adsorbents for gas-solid adsorption systems
PublicationThe dissertation presents results of the experimental research on asphaltene-based adsorbents (support coated with asphaltene layer) for gas-solid adsorption systems, with special reference to volatile organic compounds (VOCs) removal from gas streams. Analysis of gas adsorption properties revealed that asphaltenes isolated from oxidized bitumen have strong affinity toward VOCs. Interactions with target gas molecules, and selectivity...
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Investigation of solid polymer electrolyte gas sensor with different electrochemical techniques
PublicationIn this work solid polymer electrolyte (SPE) amperometric sulphur dioxide sensor is investigated. Nafion was used as a membrane electrode and 1M sulphuric acid as an internal electrolyte. Sensor response to sulphur dioxide was measured. Besides traditional constant voltage amperometry also different electrochemical techniques were used. Results obtained by these methods are compared.
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Magnetoelectric effect in (BiFeO3)x–(BaTiO3)1-x solid solutions
PublicationThe aim of the present work was to study magnetoelectric effect (ME) in (BiFeO3)x–(BaTiO3)1x solid solutions in terms of technological conditions applied in the samples fabrication process. The rapidly growing interest in these materials is caused by their multiferroic behaviour, i.e. coexistence of both electric and magnetic ordering. It creates possibility for many innovative applications, e.g. in steering the magnetic memory...
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Solventless sample preparation techniques based on solid- and vapour-phase extraction
PublicationThe main objective of this review is to critically evaluate recent developments in solventless sample preparation techniques. The potential of a variety of sample preparation techniques based on solid- and vapour-phase extraction techniques is evaluated. Direct thermal extraction and derivatization processes to facilitate the extraction of analytes in different areas are included. The applicability, disadvantages and advantages...
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Evidence for solid state electrochemical degradation within a small molecule OLED
PublicationAcridone derivative have been synthesised and used as OLED (Organic Light Emitting Diode) emitters which were found to be electroactive. Electrochemical investigations showed a side reaction takes place inside an active layer which diminished the overall device efficiency. By using a dopant and host active layer architecture, the formation of the by product was removed. The by-product was identified as a σ-dimer formed inside an...
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NANOCRYSTALLINE CATHODES FOR SOLID OXIDE FUEL CELLS MADE OF NOBLE METALS
PublicationCathodes for solid oxide fuel cells prepared by the infiltration method at 600 °C are presented. The infiltration method allows to produce stable, nanostructured electrodes. Cathodes were prepared using gold, platinum, La2NiO4+δ (L2N) and La0.6Sr0.4Co0.2Fe0.8O3 δ (LSCF). Symmetrical cathode/electrolyte/cathode samples were prepared and examined with SEM microscopy and electrochemical impedance spectroscopy. Despite successful deposition...
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Histaminol and Its Complexes with Copper(II) - Studies in Solid State and Solution
PublicationHistaminol [4(5)-(B-hydroxyethyl)imidazole, 4-(1H-imidazol-2-yl)ethanol, L] is an analogue of histamine and its minor metabolite. So far its properties have not been studied in detail due to the synthetic difficulties. Here, the structure and acid-base properties of histaminol, as well as the results of studies on its copper(II) complexes in solid state and aqueous solution are reported. Stability constants of the histaminol–CuII...
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Formation of intermetallic compounds in the solid-liquid composites of the Ga-Ni system
PublicationThe processes of formation of intermetallic compounds in the composite system of liquid gallium-nickel powder by the methods of x-ray diffraction, scanning electron microscopy and differential thermal analysis have been studied. A change in the phase composition was discovered and the influence of thermal treatment of the composites under investigation on the phase formation processes was analyzed. The mechanism of gallium enriched...
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Enhanced energy conversion as a result of fluid-solid interaction in micro- and nanoscale
PublicationIt is known that nano- and micromechanics require new approaches to right describing of surface-like phenomena which lead to an enhanced energy conversion. In this work, a general form of surface forces that consist of a contribution from both the friction and mobility components has been extended to collect the effects of bulk and surface motion of a fluid. Quite similar impact can be observed for a solid-fluid mixture, where...
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Is the Solid Electrolyte Interphase an Extra-Charge Reservoir in Li-Ion Batteries?
PublicationAdvanced metal oxide electrodes in Li-ion batteries usually show reversible capacities exceeding the theoretically expected ones. Despite many studies and tentative interpretations, the origin of this extra-capacity is not assessed yet. Lithium storage can be increased through different chemical processes developing in the electrodes during charging cycles. The solid electrolyte interface (SEI), formed already during the first...
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Environmental aspects of coastal earth structures made of soil-ash composites
PublicationThis paper presents an innovative technology of building the coastal dams with the use of soil-ash composites. A natural- scale test stand and results of the performed environmental tests are presented ; they have been compared with standards for purity of soils and waters. Also, an analysis of the obtained results and discussion of trends and anomalies in the observations, are given.
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Stabilization of Solid Residues Obtained During Sewage Sludge Thermal Treatment
PublicationCurrently wastewater treatment plants are still dealing with the problem of ecological management of sewage sludge. Nowadays, thermal utilization is considered the most eco-friendly way of processing excess sludge. However, during mentioned process, fractions of ashes and dusts are generated. Such wastes, especially dusts fraction, can be potentially harmful for the environment and wastes should be stabilized before further management....
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Genetic and biochemical characterization of yeasts isolated from Antarctic soil samples
PublicationThe Polish Arctowski Station is situated in the maritime Antarctic on the western shore ot' Admiralty Bay and encompasses terrestrial habitats which are not perma-nently covered by ice, in contrast to morę than 90% of the island's surface area. Over the past several decades, stud-ies exploring the soils of those habitats have revealed a considerable diversity of bacteria, filamentous fungi, and, to a lesser extent, yeasts; however,...
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Influence of anodes fabrication conditions on properties of solid oxide fuel cells
PublicationW pracy zamieszczono wyniki badań tlenkowych ogniw paliwowych różniących się warunkami przygotowania anody. Poszczególnego ogniwa różniły się ciśnieniem ściskania, temperaturą spiekania i składem anody.
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Urinary Tract Infections of Escherichia coli Strains of Chaperone-Usher System
PublicationZakażenia dróg moczowych stanowią bardzo poważny problem zdrowotny i ekonomiczny dotyczący milionów ludzi, każdego roku na całym świecie. Najbardziej rozpowszechnionym czynnikiem etiologicznym tego typu infekcji bakteryjnych, obejmujących górne i dolne drogi moczowe, są szczepy E. coli, reprezentujące około 80% przypadków. Uropatogenne szczepy E. coli produkują kilka czynników urowirulentncyh, które można podzielić na dwa główne...
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Modified and pristine biochars for remediation of chromium contamination in soil and aquatic systems
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Effect of bulk solid on strength of cylindrical corrugated silos during filling.
PublicationW artykule przedstawiono wyniki MES dla metalowych silosów z blachy falistej o kształcie cylindrycznym. Obliczenia wykonano podczas stanu napełnienia silosów z uwzględnieniem materiału sypkiego. Materiały sypki został opisany hipoplastycznym modelem konstytutywnym. W obliczeniach wzięto pod uwagę wstępne imperfekcje geometryczne. Wyniki porównano dla silosów pustych. Zaobserwowano pozytywny efekt obecności materiału sypkiego.
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Comparative analysis of mRNA transcripts of HT-29 cell line expressed in identical quantities for pathogenic E. coli strains UM146 and UM147 with control Escherichia coli Nissle 1917
PublicationAim of study was comparative analysis of mRNA transcripts of HT-29 cell line, expressed in identical quantities for the combination of pathogenic and non-pathogenic Escherichia coli strains. HT-29 confluent monolayers infection with two pathogenic E. coli strains UM146 and UM147 resulted in two sets of mRNA transcripts that were identical with RNA transcripts obtained for non-pathogenic one strain E. coli Nissle 1917. In this study...
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Synthesis, chemical structure and properties of cross-linked poly(esterourethanes) based on unsaturated oligo(alkyleneester)diols
PublicationW pracy przedstawiono wyniki badań struktury chemicznej i właściwości nienasyconych oligo(alkilenoestro)dioli oraz syntetyzowanych z ich udziałem poli(estrouretanów). Strukturę oligomeroli oraz poliuretanów ustalono w oparciu o wyniki badań FTIR, NMR, analizę elementarną. Właściwości poli(estrouretanów) określono przez pomiary stabilności termicznej, analizę termomechaniczną oraz obliczenia ciężaru cząsteczkowego łańcuchów polimerowych...
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Sol-gel technique - a versatile tool for adsorbent preparation
PublicationPrzygotowanie próbek do analizy, w tym przede wszystkim izolacja i/lub wzbogacanie analitów stanowi kluczowy element każdej procedury analitycznej z zakresu oznaczania składników śladowych. Wyzwania analityczna są związane zarówno z właściwościami fizykochemicznymi samych analitów jak i składników matrycy oraz stosowanych sorbentów. Choć gama znanych sorbentów i faz stacjonarnych, które można wykorzystać w praktyce analitycznej...
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The solubilization of hydrocarbon mixtures as one of the mechanisms of hydrophobic pollutants removal from soil
PublicationBadano solubilizację mieszanin węglowodorów alifatycznych (dekanu, dodekanu, tetradekanu, heksadekanu) i aromatycznych (toluenu, o-xylenu) w roztworach micelarnych surfaktantów niejonowych - oksyetylenowanego alkoholu (Rokanol NL6) i alkilopoliglukozydów (Triton BG10, AG 6210). Najwyższą efektywność solubilizacji uzyskano dla Rokanolu NL6. Efektywność solubilizacji mieszaniny zależała od rozpuszczalności poszczególnych jej składników...
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Identification and molecular modeling of a novel lipase from an Antarctic soil metagenomic library.
PublicationIn this work, we present the construction of a metagenomic library in Escherichia coli using pUC19 vector and environmental DNA directly isolated from Antarctic topsoil and screened for lipolytic enzymes. The screening on agar supplemented with olive oil and rhodamine B revealed one clone with lipolytic activity (Lip1) out of 11,000 E. coli clones. This clone harbored a plasmid, pLip1, which has an insert of 4722 bp that has been...
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Studies of human and veterinary drugs' fate in environmental solid samples- analytical problems.
PublicationW różnych ośrodkach naukowych na całym świecie trwają prace nad poznaniem losu środowiskowego zanieczyszczeń z grupy farmaceutyków. Obecność pozostałości farmaceutycznych w poszczególnych elementach środowiska stanowi nowe wyzwanie zarówno z punktu widzenia technologii oczyszczania wód i ścieków jak i analityków, których zadaniem jest opracowanie nowych metodyk analitycznych. W publikacji przedstawiono problemy z jakimi stykają...