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Phase transitions and microstructure of emulsion systems prepared with acylglycerols/zinc stearate emulsifier
PublikacjaZbadano przemiany fazowe jakim ulegają układy emulsyjne w czasie procesu emulgowania, prowadzonego w obecności emulgatora acyloglicerolowego modyfikowanego stearynianem cynku. Rodzaj przemian mikrostrukturalnych jakim ulegały emulsje zależny był w głównej mierze od temperatury oraz zawartości fazy wodnej. Obserwowano powstawanie emulsji typu W/O, która wraz z obniżaniem temperatury ulegała inwersji prowadzącej do powstania dyspersji...
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Effects of subfilter velocity modelling on dispersed phase in LES of heated channel flow
PublikacjaA non-isothermal turbulent flow with the dispersed phase is modelled using the Large Eddy Simulation (LES) approach for fluid, one-way coupled with the equations of point-particle evolution. The channel is heated at both walls and isoflux boundary conditions are applied for fluid. Particle velocity and thermal statistics are computed. Of particular interest are the r.m.s. profiles and the probability density function of particle...
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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...
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Volatile organic compound separation from gas phase using ionic liquids
PublikacjaZanieczyszczenie powietrza lotnymi związkami organicznymi staje się światowym problemem ochrony środowiska w związku z ich toksycznymi właściwościami. W związku z tym poszukuje się nowych, efektywnych technologii oczyszczania strumieni gazowych. Powszechnie stosowaną metodą jest utlenianie termiczne. Wiąże się ono jednak z Wysokiem zużyciem energii i efektami ubocznymi w postaci emisji dwutlenku węgla i tlenków azotu. Alternatywą...
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Sensorless Multiscalar Control of Five-Phase Induction Machine with Inverter Output Filter
PublikacjaThe paper presents a complete solution for speed sensorless control system for five-phase induction motor with voltage inverter, LC filter and nonlinear control of combined fundamental and third harmonic flux distribution. The control principle, also known as multiscalar control, nonlinear control or natural variables control, is based on a use of properly selected scalar variables in control feedback to linearize controlled system....
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The domination of ionic conductivity in tetragonal phase of the organometal halide perovskite CH3NH3PbI3-xClx
PublikacjaOrganometal trihalide perovskites have recently gained extreme attention due to their high solar energy conversion in photovoltaic cells. Here, we investigate the contribution of iodide ions to a total conductivity of the mixed lead halide perovskite CH3NH3PbI3−xClx with a use of the modified DC Hebb–Wagner polarization method. It has been identified that an ionic conductivity dominates in tetragonal phase which is associated with room...
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Comparison of Transmission Capacities of Two Regulation Systems: Lateral and in-phase Control Transformers
PublikacjaThis paper presents a comparison of regulation capabilities of lateral and in-phase control transformers in a selected node of a power system. Their regulation capabilities are presented, as well as cross-system exchange options.
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Radioisotope measurements of the liquid-gas flow in the horizontal pipeline using phase method
PublikacjaThe paper presents application of the gamma-absorption method to a two-phase liquid-gas flow investigation in a horizontal pipeline. The water-air mixture was examined by a set of two Am-241 radioactive sources and two NaI(Tl) scintillation probes. For analysis of the electrical signals obtained from detectors the cross-spectral density function (CSDF) was applied. Results of the gas phase average velocity measurements for CSDF...
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Size Exclusion Coupled to Reversed Phase Liquid Chromatography for the Characterization of Cranberry Products
PublikacjaA combination of solvent extraction, size exclusion purification, and reversed-phase liquid chromatography with UV absorption and fluorescence detection was here used for the determination of flavan-3-ols and related oligomeric compounds in cranberry products. The method relied on robust, simple, and inexpensive instrumental equipment present in most of routine analytical laboratories. Sample extracts in methanol/water/hydrochloric...
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Sensorless Disturbance Detection for Five Phase Induction Motor with Third Harmonic Injection
PublikacjaThe paper presents a sensorless disturbance detection procedure that was done on a five phase induction motor with third harmonic injection. A test bench was developed where a three phase machine serves as disturbance generator of different frequencies. The control of the machines is based on multi scalar variables that ensures an independent control of the motor EMF and the rotor flux. For disturbance identification a speed observer...
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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.
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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...
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Study of Phase and Chemical Composition of Bi1-xNdxFeO3 Powders Derived by Pressureless Sintering
PublikacjaIn the present paper studies on Bi1xNdxFeO3 for x =0.1-0.4 are reported. The mixed oxide method followed with pressureless sintering was employed for ceramics fabrication. Thermal behavior of stoichiometric mixtures of simple oxide powders, viz. Bi2O3, Nd2O3 and Fe2O3 was studied by simultaneous thermal analysis. It was found that with an increase in neodymium content the weight loss increased from 0.75% to 3.16% for x =0.1 and...
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Application of surface active amino acid ionic liquids as phase-transfer catalyst
PublikacjaFive structurally related morpholinium derived ionic liquids containing N-acetyl-glycinate anion were synthesized and their thermal stability, surface properties and activity as phase transfer catalysts investigated. The thermal properties were studied by differential scanning calorimetry, while the adsorption at the air/water interface and micellization behavior was analyzed by surface tension measurements, conductometry and isothermal...
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Multimodal Genetic Algorithm with Phase Analysis to Solve Complex Equations of Electromagnetic Analysis
PublikacjaIn this contribution, a new genetic-algorithm-based method of finding roots and poles of a complex function of a complex variable is presented. The algorithm employs the phase analysis of the function to explore the complex plane with the use of the genetic algorithm. Hence, the candidate regions of root and pole occurrences are selected and verified with the use of discrete Cauchy's argument principle. The algorithm is evaluated...
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Fault-tolerant performance of the novel five-phase doubly-fed induction generator
PublikacjaThe article presents the concept of a new design of a multi-phase doubly-fed induction generator (DFIG). The innovative design approach uses a five-phase power supply from the rotor side of the generator with a three-phase classic stator power supply. Modern three-phase doubly-fed induction generators are the dominant choice for Wind Energy Conversion Systems (WECS). Solutions of this type are sensitive to the loss of at least...
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Possible quadrupole-order-driven commensurate-incommensurate phase transition in B20 CoGe
PublikacjaThe B20-type cobalt germanide CoGe was investigated by measuring the specific heat, resistivity, and 59Co nuclear magnetic resonance (NMR).We observed a phase transition at TQ = 13.7 K, evidenced by a very narrow peak of the specific heat and sharp changes of the nuclear spin-spin (T −1 2 ) and spin-lattice (T −1 1 ) relaxation rates. The fact that the entropy release is extremely small and the Knight shift is almost independent...
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Radar Signal Parameters Estimation Using Phase Accelerogram in the Time-Frequency Domain
PublikacjaRadar signal parameter estimation, in the context of the reconstruction of the received signal in a passive radar utilizing other radars as a source of illumination, is one of the fundamental steps in the signal processing chain in such a device. The task is also a crucial one in electronic reconnaissance systems, e.g. ELINT (Electronic Intelligence) systems. In order to obtain accurate results it is important to measure, estimate...
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Active Control of Highly Autocorrelated Machinery Noise in Multivariate Nonminimum Phase Systems
PublikacjaIn this paper, a novel multivariate active noise control scheme, designed to attenuate disturbances with high autocorrelation characteristics and preserve background signals, is proposed. The algorithm belongs to the class of feedback controllers and, unlike the popular feedforward FX-LMS approach, does not require availability of a reference signal. The proposed approach draws its inspiration from the iterative learning control...
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Measurements of Two-phase Flows in Pipelines Using Radioisotopes and Statistical Signal Processing
PublikacjaThis paper presents an application of radiotracers and gamma absorption method in two-phase flow measurements in pipelines. Two different methods were implemented to analysis of acquired signals. Investigated methods are based on the cross-correlation function and the phase of the cross-spectral density distribution. The examples presented in the article illustrate the application of the radioisotopes to evaluation of liquid-gas...
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Improvements to the two-phase sandwich method for calculating the melting points of pure metals
PublikacjaThe thermophysical properties of metal alloys are often investigated via molecular dynamics (MD) simulations.An exact and reliable estimation of the thermophysical parameters from the MD data requires a properly and carefullyelaborated methodology. In this paper, an improved two-phase sandwich method for the determination of the metal meltingtemperature is proposed, based on the solid-liquid equilibrium theory. The new method was...
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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...
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Headspace liquid phase microextraction for quantitation of hexanal in potato crisps by gas chromatography
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In-Tube Molecularly Imprinted Polymer Solid-Phase Microextraction for the Selective Determination of Propranolol
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Solid-phase microextraction and ion chromatographic analysis of anions based on polypyrrole electrode
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Electrochemical and biological characterization of lyotropic liquid crystalline phases – retardation of drug release from hexagonal mesophases
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Socioemotional Wealth (SEW) of Family Firms and CEO Behavioral Biases in the Implementation of Sustainable Development Goals (SDGs)
PublikacjaAgreed upon by the UN member states, Agenda 2030 assumes joint action for long- term sustainable development. These actions are focused on the implementation of 17 Sustainable Development Goals (SDGs), where actions are assumed to lead to the suppression of negative externalities of human activity. It is stressed that the objectives of sustainable development can only be achieved through deep institutional changes in most dimensions...
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Influence of e-beam irradiation on the dynamic creep and fatigue properties of poly(aliphatic/aromatic-ester) copolymers for biomedical applications
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Analysis of the unique structural and physicochemical properties of the DraD/AfaD invasin in the context of its belonging to the family of chaperone/usher type fimbrial subunits
PublikacjaInwazyna DraD kodowana przez operon dra posiada strukturę charakterystyczną dla białek podjednostkowych fimbrii typu chaperone-usher. Fold-Ig białka DraD posiada dwie charakterystyczne cechy wyróżniające je z pośród rodziny fimbrialnych białek podjednostkowych: 1) zaburzenie struktury beta-beczki w rejonie szczeliny akceptorowej objawiające się układem wiązań wodorowych głównego łańcucha polipeptydowego oraz 2) nietypowo usytuowany...
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Structural phase transitions and photoluminescence properties of oxonitridosilicate phosphors under high hydrostatic pressure
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Development and validation of urinary nucleosides and creatinine assay by capillary electrophoresis with solid phase extraction
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STUDYING THE PROCESS OF OBTAINING PHOSPHATES OF METALS BASED ON THE PHASE EQUILIBRIA OF FOUR COMPONENT SYSTEMS
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pH Gradient as a Tool for the Separation of Ionizable Analytes in Reversed-Phase High-Performance Chromatography
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Synthesis, structure and application of a new class of Tr-podands derived in phase-transfer catalysis
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Matrix Metalloproteinase-9 Is Required for Hippocampal Late-Phase Long-Term Potentiation and Memory
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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...
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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.
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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...
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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.
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Assessment of phase stability and in vitro biological properties of hydroxyapatite coatings composed of hexagonal rods
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Zero phase shift digital filtering for assessment of exposure to non-sinusoidal magnetic fields
PublikacjaAccuracy of assessment of human body exposure to magnetic fields is affected by several uncertainty sources. One of them is estimation of the total exposure to non-sinusoidal fields. Standard methods can be implemented using analogue or digital filters that introduce a phase shift that affect the result of total exposure level estimation. The paper presents a new method that allows performing more precise assessment of exposure...
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Selected aspects of two-phase flow studies using different visualization techniques in minichannels
PublikacjaThe subject of the study is to present the possibility of the use of visualization techniques in the researches on two-phase flows, carried out by the authors for many years. These works included as follows: heat transfer during the flow boiling, boiling crises and condensation in flow. The issue of the heat transfer intensification during the flow boiling through the channels of small diameters was analyzed. All this work focused...
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Evaluation of Linkers’ Influence on Peptide-Based Piezoelectric Biosensors’ Sensitivity to Aldehydes in the Gas Phase
PublikacjaRecent findings qualified aldehydes as potential biomarkers for disease diagnosis. One of the possibilities is to use electrochemical biosensors in point-of-care (PoC), but these need further development to overcome some limitations. Currently, the primary goal is to enhance their metrological parameters in terms of sensitivity and selectivity. Previous findings indicate that peptide OBPP4 (KLLFDSLTDLKKKMSEC-NH2) is a promising...
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Dead time effects compensation strategy by third harmonic injection for a five-phase inverter
PublikacjaThis paper proposes a method for compensation of dead-time effects for a fivephase inverter. In the proposed method an additional control subsystem was added to the field-oriented control (FOC) scheme in the coordinate system mapped to the third harmonic. The additional control loop operates in the fixed, orthogonal reference frame ( α - β coordinates) without the need for additional Park transformations. The purpose of this method...
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Nickel loaded zeolites FAU and MFI: Characterization and activity in water-phase hydrodehalogenation of TCE
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Distinguishing between polymorphic forms of linezolid by solid-phase electronic and vibrational circular dichroism
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Dielectric response of electric-field distortions of the twist-bend nematic phase for LC dimers
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Origin of the liquid-liquid phase transition for trans-1,2-dichloroethylene observed by IR spectroscopy
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Phase separation in poly(butylene terephthalate)-based materials prepared by solid-state modification
PublikacjaThe morphology of a series of poly(butylene terephthalate) (PBT)/fatty acid dimer diol (FADD)-based copolyesters prepared by solid-state modi fi cation (SSM) was studied. It was shown that in copolyesters containing less than 10 wt% FADD two different phases, i.e. a PBT crystalline phase and a PBT-rich amorphous phase, are present. The FADD residues were more or less homogeneously distributed throughout the interlamellar regions....
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Nonlinear control of five phase induction motor with synchronized third harmonic flux injection
PublikacjaThe paper deals with the novel control system for five phase induction motor (IM) that enables the injection of the rotor flux 3rd harmonic component. Two multiscalar models are transformed from the 1-1 and 2-2 vector models developed in the 1st and 3rd harmonic planes. Based on the obtained multiscalar models the synthesis of dual multiscalar control is established. The obtained two multiscalar control systems can independently...