Filtry
wszystkich: 2605
wybranych: 2138
-
Katalog
Filtry wybranego katalogu
wyświetlamy 1000 najlepszych wyników Pomoc
Wyniki wyszukiwania dla: REVERSE PHASE COLUMN
-
How Do Intermolecular Interactions Evolve at the Nematic to Twist–Bent Phase Transition?
Publikacja -
Phase diagram of P3HT:PC70BM thin films based on variable-temperature spectroscopic ellipsometry
Publikacja -
Anomalous Thermal Behavior of Salicylsalicylic Acid and Evidence for a Monotropic Transition to a Nematic Phase
Publikacja -
The existence and gas phase acidity of the HAlnF3n+1 superacids (n=1–4)
Publikacja -
A new method for preparation of rutile phase titania photoactive under visible light
Publikacja -
Headspace liquid phase microextraction for quantitation of hexanal in potato crisps by gas chromatography
Publikacja -
Solid-phase microextraction and ion chromatographic analysis of anions based on polypyrrole electrode
Publikacja -
In-Tube Molecularly Imprinted Polymer Solid-Phase Microextraction for the Selective Determination of Propranolol
Publikacja -
Kinetics of Biotic and Abiotic CO Production during the Initial Phase of Biowaste Composting
Publikacja -
Preliminary investigations on biological treatment of aqueous phase separated from cutting fluids
PublikacjaZaprezentowano wyniki fizykochemicznego podczyszczania przepracowanych cieczy obróbkowych pochodzących z różnych źródeł. Emulsje przepracowanych cieczy obróbkowych zostały rozdzielone na fazę organiczną i wodną z wykorzystaniem różnych koagulantów. Wydzielona faza wodna została następnie poddana biologicznemu oczyszczaniu z wykorzystaniem osadu czynnego. W wyniku oczyszczania ścieków uzyskano 59-88% obniżenie wartości ChZT.
-
How Does International Competitiveness Affect Economic Development? A Two-Phase Hypothesis
PublikacjaThis paper analyses the impact of international competitiveness on economic development, based on the World Economic Forum Global Competitiveness Index (GCI) and GDP/capita of 125 countries during the period 2007-2010. The results reveal two phases of the evolution of competitiveness. When GCI < 4.5 (on 1-7 scale), any improvement of a country’s competitiveness affects current development more than future development. When...
-
Sensorless control of five-phase induction machine supplied by the VSI with output filter
PublikacjaIn this paper, a novel sensorless control structure based on multi-scalar variables is proposed. The tatic feedback control law is obtained by using the multi-scalar variables transformation, where the multi-scalar variables approach allows a full linearization of the nonlinear system. The control system could be described as “optimized” because of the minimized number of controllers. Furthermore, control system is divided into...
-
Effective dielectric constant of two phase systems: Application to mixed conducting systems
PublikacjaW pracy przedstawiono wyniki badań spektroskopii impedancyjnej systemów dwufazowych oraz ich porównanie z wynikami oczekiwanymi przez różne modele.
-
Solid-phase synthesis and characterization of N-acetylated Gly-His-Lys analogues
PublikacjaZaprezentowano nowe analogi tripeptydu Gly-His-Lys (GHK), stanowiącego sekwencję naturalnie występującą w -II-łańuchu kolagenu, skąd jest uwalniany w stanach zapalnych i w procesach gojenia się ran. Gly-His-Lys jest szeroko stosowany na rynku kosmetycznym w połączeniu z kwasem palmitynowym, który ułatwia jego wnikanie w głąb skóry. Zaplanowane modyfikacje zawierały fragment Gly-X-Y (X=Met, Hyp, Hyp-Met, Gly-Hyp; Y=Lys, D-Lys) i...
-
Blowing Kinetics, Pressure Resistance, Thermal Stability, and Relaxation of the Amorphous Phase of the PET Container in the SBM Process with Hot and Cold Mold. Part I: Research Methodology and Results
PublikacjaThe technology of filling drinks without preservatives (such as fresh juices, iced tea drinks, vitaminized drinks) is carried out using hot filling. Mainly due to the production costs and lower carbon footprint, polyethylene terephthalate bottles, commonly called PET, are increasingly used in this technology. In this paper, the main aim is to describe the statistical analysis methodology of the influence of the temperature of the...
-
In-situ odd random phase electrochemical impedance spectroscopy study on the electropolymerization of pyrrole on iron in the presence of sodium salicylate – The influence of the monomer concentration
PublikacjaIn this work, the potentiostatic electropolymerization of polypyrrole (PPy) on iron in aqueous solution of sodium salicylate and pyrrole is studied in situ by odd random phase electrochemical impedance spectroscopy (ORP-EIS). The influence of the pyrrole concentration on the electrosynthesis process is investigated. The ORP-EIS technique ensures a reliable analysis of the PPy electrosynthesis on iron by means of an advanced data...
-
Ionogel fibres of bis(trifluoromethanesulfonyl)imide anion-based ionic liquids for the headspace solid-phase microextraction of chlorinated organic pollutants
PublikacjaIonogels, a family of hybrid materials in which ionic liquids (ILs) are confined in a sol–gel network, are receiving much attention in a variety of scientific and technological fields. In this work, ionogels derived from three different ILs based on the anion bis(trifluoromethanesulfonyl)imide (TFSI), namely 1-butyl- 3-methylpyridinium bis(trifluoromethanesulfonyl)imide ([C4C1Py][TFSI]), 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide...
-
Electrochemically Obtained TiO2/CuxOy Nanotube Arrays Presenting a Photocatalytic Response in Processes of Pollutants Degradation and Bacteria Inactivation in Aqueous Phase
PublikacjaTiO2/CuxOy nanotube (NT) arrays were synthesized using the anodization method in the presence of ethylene glycol and different parameters applied. The presence, morphology, and chemical character of the obtained structures was characterized using a variety of methods—SEM (scanning electron microscopy), XPS (X-ray photoelectron spectroscopy), XRD (X-ray crystallography), PL (photoluminescence), and EDX (energy-dispersive X-ray spectroscopy)....
-
Optimization of vortex-assisted hydrophobic magnetic deep eutectic solvent-based dispersive liquid phase microextraction for quantification of niclosamide in real samples
PublikacjaIn this manuscript, a green and fast vortex-assisted hydrophobic magnetic deep eutectic solvent-based dispersive liquid phase microextraction (VA-HMDES-DLPME) method was developed for the selective extraction and determination of niclosamide in read samples, including rice, medicine tablets, and water samples. Here, hydrophobic magnetic deep eutectic solvents were used as the extracting solvent without requiring any centrifugation...
-
Determination of phenylbutazone, sulfamethazine, carbendazim and linuron using a novel pine bark biosorbent for solid-phase extraction (SPE) with high-performance liquid chromatography (HPLC)
PublikacjaThe paper presents a novel pine bark based biosorbent for solid-phase extraction (SPE). The morphology and composition of the pine bark were characterized using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The biosorbent was used for the preparation of wastewater for the determination of phenylbutazone, sulfamethazine, carbendazim, and linuron by high performance liquid chromatography with...
-
Blowing Kinetics, Pressure Resistance, Thermal Stability, and Relaxation of the Amorphous Phase of the PET Container in the SBM Process with Hot and Cold Mold. Part II: Statistical Analysis and Interpretation of Tests
PublikacjaThe technology of filling drinks without preservatives (such as fresh juices, iced tea drinks, and vitaminized drinks) is carried out using hot filling. Mainly due to the production costs and lower carbon footprint, polyethylene terephthalate (PET) bottles are increasingly used in this technology. In this paper, the main aim is to describe and interpret the results of statistical analysis of the influence of the temperature of...
-
Discrepancies in determination of biogenic amines in beer samples by reversed phase and hydrophilic interaction liquid chromatography coupled with tandem mass spectrometry
PublikacjaBiogenic amines (BAs) are nitrogenous organic bases occurring mainly in fermented food and beverages as a result of free amino acids bacterial decarboxylation. The reversed phase liquid chromatography (RPLC) and hydrophilic interaction liquid chromatography (HILIC) based methods were compared in terms of usefulness for determination of BAs in beer samples. Analysis of BAs with the use of RPLC method were carried out after their...
-
Modelling hydraulic and capillary-driven two-phase fluid flow in unsaturated concretes at the meso-scale with a unique coupled DEM-CFD technique
PublikacjaThe goal of the research was to demonstrate the impact of thin porous interfacial transition zones (ITZs) between aggregates and cement matrix on fluid flow in unsaturated concrete caused by hydraulic/capillary pressure. To demonstrate this impact, a novel coupled approach to simulate the two-phase (water and moist air) flow of hydraulically and capillary-driven fluid in unsaturated concrete was developed. By merging the discrete...
-
Solid phase microextraction–comprehensive twodimensional gas chromatography–time-of-flight mass spectrometry: a new tool for determining PAHs in airport runoff water samples
Publikacjafundamental aspect of airport operations is the pollution caused by airport runoff waters. Polycyclic aromatic hydrocarbons (PAHs) are one of the most important groups of xenobiotics which are commonly found in runoff water originating from airports. Only very limited data on the analysis of airport runoff water have been published until now. Therefore, a reliable and accurate analytical method based on headspace solid-phase microextraction...
-
Assessment of phase stability and in vitro biological properties of hydroxyapatite coatings composed of hexagonal rods
Publikacja -
pH Gradient as a Tool for the Separation of Ionizable Analytes in Reversed-Phase High-Performance Chromatography
Publikacja -
Chapter 13 : The influence of dispersion phase on composite coating properties after cold working
PublikacjaW pracy określono wpływ fazy dyspersyjnej Al2O3 na wybrane potencjalne właściwości powłok kompozytowych o osnowie niklowej. Powłoki Ni-Al-Al2O3 zostały nałożone na próbki stalowe przy użyciu technologii poddźwiękowego płomieniowego natryskiwania cieplnego. Następnie poddane zostały obróbce plastycznej na zimno i na gorąco poprzez walcowanie, a także prasowania na zimno na prasie hydraulicznej. Obróbka plastyczna jest metodą alternatywną...
-
Comparison the Accuracy of the Extrapolation Methods of the Time Phase Coincidence in Synchronization of Power Generating Units
PublikacjaW artykule opisano metody ekstrapolacji chwili zgodności fazowej napięć łączonych obiektów elektroenergetycznych. Przeprowadzono analizę porównawczą wybranych metod ekstrapolacji w równych warunkach pracy oraz przedstawiono najistotniejsze wyniki badań.
-
Matrix Metalloproteinase-9 Is Required for Hippocampal Late-Phase Long-Term Potentiation and Memory
Publikacja -
STUDYING THE PROCESS OF OBTAINING PHOSPHATES OF METALS BASED ON THE PHASE EQUILIBRIA OF FOUR COMPONENT SYSTEMS
Publikacja -
Synthesis, structure and application of a new class of Tr-podands derived in phase-transfer catalysis
Publikacja -
Investigations of hydraulic jump configured by a two phase air water jetimpinging on a flat plate.
PublikacjaPrzedstawiono wyniki badań eksperymentalnych uskoku hydraulicznego powstającego przy napływie strugi uderzającej na powierzchnię płaskiej płyty.
-
Nickel loaded zeolites FAU and MFI: Characterization and activity in water-phase hydrodehalogenation of TCE
Publikacja -
Distinguishing between polymorphic forms of linezolid by solid-phase electronic and vibrational circular dichroism
Publikacja -
Dielectric response of electric-field distortions of the twist-bend nematic phase for LC dimers
Publikacja -
Origin of the liquid-liquid phase transition for trans-1,2-dichloroethylene observed by IR spectroscopy
Publikacja -
Structural phase transitions and photoluminescence properties of oxonitridosilicate phosphors under high hydrostatic pressure
Publikacja -
Development and validation of urinary nucleosides and creatinine assay by capillary electrophoresis with solid phase extraction
Publikacja -
Headspace Liquid-Phase Microextraction of Chlorobenzenes in Soil with Gas Chromatography-Electron Capture Detection
Publikacja -
Solid Phase Photocatalytic Reaction on the Soot/TiO2 Interface: The Role of Migrating OH Radicals
Publikacja -
Phenomenon of hydraulic jump formed on liquid layer by single-phase impinging liquid jet
PublikacjaPrzedstawiono analizę teoretyczną zjawiska uskoku hydraulicznego tworzonego przez uderzającą strugę. rezultaty analizy teoretycznej porównano z wynikami badań eksperymentalnych.
-
On the mechanism of oscillations in three-phase system containing coationc surfactant and nitrobenzene liquid membrane
PublikacjaObserwuje się oscylacje różnicy potencjału elektochemicznego między fazami wodnymi oscylatora zawierającego bromek heksadecylotrimetyloamoniowy. Ta różnica potencjału składa sie z potencjałów na granicach faz między membraną a fazą wodną donorową oraz membraną a fazą wodną akceptorową. Wykazano, że oscylacje zachodzą na granicy fazy akceptorowej i membrany. Są one spowodowane procesami adsorpcji/desorpcji pary jonowej surfaktantu...
-
Highly effective asphaltene-derived adsorbents for gas phase removal of volatile organic compounds
PublikacjaA novel nitrated asphaltene-derived adsorbent (Asf-Nitro) was prepared using facile isolation and modification procedures. The successful modification was confirmed by Fourier-transform infrared spectroscopy (FTIR). The nitrated adsorbent was evaluated in terms of dispersive and specific interactions, Lewis acid-base properties and adsorption isotherms by means of inverse gas chromatography (IGC). Nitration was found to be extremely...
-
Mathematical modeling of hydrogen production performance in thermocatalytic reactor based on the intermetallic phase of Ni3Al
PublikacjaThe main goal of the following work is to adjust mathematical modelling for mass transfer, to specific conditions resulting from presence of chemical surface reactions in the flow of the mixture consisting of helium and methanol. The thermocatalytic devices used for decomposition of organic compounds incorporate microchannels coupled at the ends and heated to 500 oC at the walls regions. The results of the experiment were compared...
-
Furan Fragmentation in the Gas Phase: New Insights from Statistical and Molecular Dynamics Calculations
PublikacjaWe present a complete exploration of the different fragmentation mechanisms of furan (C4H4O) operating at low and high energies. Three different theoretical approaches are combined to determine the structure of all possible reaction intermediates, many of them not described in previous studies, and a large number of pathways involving three types of fundamental elementary mechanisms: isomerization, fragmentation, and H/H2 loss...
-
A comprehensive lipidomic analysis of oilseeds using LC-Q-TOF-MS and dispersive micro-solid phase (D-μ-SPE) extraction techniques
PublikacjaGrowing public health awareness increased the demand for natural products with positive health benefits. Vegetable oils containing omega-3 fatty acids (FA) such as alpha-linolenic acid (ALA) has been proposed as a possible source of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). In this work, a comprehensive lipidome analysis and comparison of seven oilseeds, including flaxseed, chia, hemp, black cumin, white sesame,...
-
Influence of dispersed phase content on the mechanical properties of electroless nanocomposite Ni-P/Si3N4 and hybrid Ni-P/Si3N4/graphite layers deposited on the AW-7075 alloy.
PublikacjaThe article presents the results of mechanical testing of Ni-P/Si3N4 nanocomposite and hybrid Ni-P/Si3N4/graphite coatings deposited on AW-7075 aluminum alloy using the chemical reduction method. In terms of mechanical testing, microhardness was measured, and surface roughness and adhesion of the coatings to the aluminum substrate were determined using the “scratch test” method. The surface morphology of the deposited layers was...
-
Development of a vortex-assisted switchable-hydrophilicity solvent-based liquid phase microextraction for fast and reliable extraction of Zn (II), Fe (II), Pb (II), and Cd (II) from various baby food products
PublikacjaThis manuscript describes the development of a novel liquid phase microextraction (LPME) method for the extraction and determination of Zn (II), Fe (II), Pb (II), and Cd (II) in various infant/baby food and supplements products. The method is based on vortex-assisted extraction combined with a switchable-hydrophilicity solvent (SHS) sample preparation. The SHS, which undergoes reversible phase changes triggered by pH change, enables...
-
Effect of Cr and Mn doping on ferroelectric and dielectric properties of Li1.72Na0.28Ge4O9 single crystals
PublikacjaLi1.72Na0.28Ge4O9 single crystals pure and slightly doped with chromium and manganese, obtained by Czochralski growth, were investigated for their ferroelectric and dielectric properties. The change in stoichometry of Li2− x Na x Ge4O9 (x = 0.28) crystals doped with Cr and Mn (0.1 mol.%) had an influence on the value of ferroelectric-to-paraelectric phase transition temperature, T c. The applied doping affects the T c value by...
-
Ultrasound assisted dispersive solid phase microextraction using polystyrene-polyoleic acid graft copolymer for determination of Sb(III) in various bottled beverages by HGAAS
PublikacjaA new polyoleic acid-polystyrene (PoleS) block/graft copolymer was synthesized and applied as adsorbent for ultrasound assisted dispersive solid phase microextraction (UA-DSPME) of Sb(III) in different bottled beverages and analysis using hydride generation atomic absorption spectrometry (HGAAS). Adsorption capacity of the PoleS was 150 mg g−1. Several sample preparation parameters such as sorbent amount, solvent type, pH, sample...