Filtry
wszystkich: 7363
-
Katalog
- Publikacje 6159 wyników po odfiltrowaniu
- Czasopisma 396 wyników po odfiltrowaniu
- Konferencje 2 wyników po odfiltrowaniu
- Osoby 172 wyników po odfiltrowaniu
- Projekty 7 wyników po odfiltrowaniu
- Kursy Online 157 wyników po odfiltrowaniu
- Wydarzenia 4 wyników po odfiltrowaniu
- Dane Badawcze 466 wyników po odfiltrowaniu
wyświetlamy 1000 najlepszych wyników Pomoc
Wyniki wyszukiwania dla: phase change materials
-
Effects of liquid phase modification on the values of surface tension of trickling liquid
Dane BadawczeDataset presents the values of surface tension of trickling liquid sampled from three running biotrickling filters.
-
Thickness and structure change of titanium(IV) oxide thin films synthesized by the sol–gel spin coating method
Publikacja -
Design advantages and analysis of a novel five-phase doubly-fed induction generator
PublikacjaPurpose – The purpose of this paper is to provide an analysis of the performance of a new five-phase doubly fed induction generator (DFIG). Design/methodology/approach – This paper presents the results of a research work related to fivephase DFIG framing, including the development of an analytical model, FEM analysis as well as the results of laboratory tests of the prototype. The proposed behavioral level analytical model is based...
-
Change of catalytic parameters for SOFC fueled by H2 and biogas mixture at 750 C
Dane BadawczeThe dataset contains the Change of catalytic parameters for SOFC fueled by H2 and biogas mixture at 750 C (60:40 CH4:CO2). The outlet concentration of the gases from SOFC were measured using novel FTIR-based unit. The parameters are conversion rates, selectivities and yields of products
-
Magnetic and structural phase transition in Ni50Mn35.5In14.5 ribbon
Publikacja -
Materials for energy storage and conversion devices 2022/2023
Kursy OnlineElectrodes: Metals as electrodes in aqueous and non-aqueous systems, metal nanoparticles. Collectors current. 3D, 2D, 1 D carbons, carbon nanomaterials. Organic semiconductors "Synthetic metals" - p-type, n-type. Inorganic semiconductors: oxides, selenides, sulfides, others. Intercalated electrodes. Mixed conductors (MIEC). Photo-active semiconductor materials. Electrolytes. Water electrolytes in commercial products. Electroactive...
-
Development of potential candidate reference materials for drugs in bottom sediment, cod and herring tissues
PublikacjaRegular use of a reference material and participation in a proficiency testing program can improve the reliability of analytical data. This paper presents the preparation of candidate reference materials for the drugs metoprolol, propranolol, carbamazepine, naproxen, and acenocoumarol in freshwater bottom sediment and cod and herring tissues. These reference materials are not available commercially. Drugs (between 7 ng/g and 32...
-
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...
-
Towards sugar-derived polyamides as environmentally friendly materials
PublikacjaAs part of our ongoing study investigating isohexide-based polyamides, we have synthesized isosorbide(bis(propan-1-amine)) (DAPIS) and studied its reactivity in the polymerization towards fully biobased polyamides. Polycondensation of nylon salts with various contributions of DAPIS afforded a family of homo- and copolyamides, which were characterized using complementary spectroscopic techniques. The chemical structure of the materials...
-
Production of certified reference materials - homogeneity and stability study based on the determination of total mercury and methylmercury
PublikacjaReference materials (RMs) play an important role in all elements of the quality assurance system of measurements. In this work, ``package'' 4 new CRMs (bottom sediment, herring tissue, cod tissue, cormorant tissue) were prepared and characterised to carry out the quality control in monitoring analysis of mercury and methylmercury in environmental samples. Materials - candidates were collected in Poland and south part of the Czech...
-
Silver(I) complexes with nitrile ligands: New materials with versatile applications
PublikacjaIn the present study, the structure, thermal stability, conductive properties, and antimicrobial activity of silver(I) complexes with nitrile ligands were investigated. For the construction of the materials, 2-cyanopyridine (2-cpy), 4-cyanopyridine (4-cpy), 1,2-dicyanobenzene (1,2-dcb), and 1,3-dicyanobenzene (1,3-dcb) were used in addition to the silver nitrite and nitrate. Four new compounds were isolated and structurally characterized:...
-
Comparison of anti-plane surface waves in strain-gradient materials and materials with surface stresses
PublikacjaHere we discuss the similarities and differences in anti-plane surface wave propagation in an elastic half-space within the framework of the theories of Gurtin–Murdoch surface elasticity and Toupin–Mindlin strain-gradient elasticity. The qualitative behaviour of the dispersion curves and the decay of the obtained solutions are quite similar. On the other hand, we show that the solutions relating to the surface elasticity model...
-
Dead-Time Effect Compensation Based on Additional Phase Current Measurements
PublikacjaThis paper proposes a new method of dead-time effect compensation. The proposed solution is based on additional phase current measurements realized by analog-to-digital converters. These measurements are carried out at the time instants specified by a pulsewidth-modulation (PWM) strategy. This makes it possible to estimate inverter currents at the commutation instants and, finally, to estimate the voltage error caused by dead time. This...
-
Effect of isovalent substitution on microstructure and phase transition of LaNb1−xMxO4 (M=Sb, V or Ta; x=0.05–0.3)
PublikacjaLaNb1−xMxO4 oxides with pentavalent elements of different ionic sizes (M=Sb, Ta and V, x=0.05–0.3) were synthesized by the solid state reaction method. Special interest was devoted to the antimony substituted lanthanum niobate which is a new material in this group. Rietveld analysis of the X-ray diffraction patterns was used to determine the influence of the material composition on unit cell parameters. On the basis of dilatometric...
-
DIFFRACTION PHASE MICROSCOPY FOR OBSERVATION ON RED BLOOD CELLS FLUCTUATION
PublikacjaNowadays there is quite huge need for more and more precise and effective fast diagnostics methods in hematology diseases. One of the most important blood components are erythrocytes – RBCs (Red Blood Cells). Due to their size they are easy to observe using microscopy. It is commonly known that the shape and lifetime of RBCs allows for early disease identification. Authors present special measurement system for RBCs fluctuations observation...
-
Technical Subjects – supplementary materials
Kursy Online -
Composites of tin oxide and different carbonaceous materials as negative electrodes in lithium-ion batteries
PublikacjaAbstract Tin and tin oxide have been considered as suitable materials with high theoretical capacity for lithium ion batteries. Their low cost, high safety and other technical benefits placed them as promising replacements for graphite negative electrodes. The problem to overcome with tin oxide, as well as with other metallic materials, is high volume changes during alloying/dealloying, subsequent pulverization, delamination from...
-
Recent advances on magnetic carbon-related materials in advanced oxidation processes of emerging pollutants degradation
PublikacjaRecently, carbon-related materials have been proposed to improve the charge separation of the photogenerated carriers in the semiconductor matrices’ and surface properties. Carbon-related materials may act as co-catalysts, enhancing the pollutants adsorption on the surface, improving the charge carriers separation and photocatalyst stability and providing more active centres for photocatalytic reactions. This review summarizes...
-
NEW EXPERIENCES IN DIKE CONSTRUCTION WITH SOIL-ASH COMPOSITESAND FINE-GRAINED DREDGED MATERIALS
PublikacjaThe supporting structure inside a coastal dike is often made of dredged non-uniform sand with good compaction proper-ties. Due to the shortage of natural construction material for both coastal and river dikes and the surplus of different processed mate-rials, new experiments were made with sand-ash mixtures and fine-grained dredged materials to replace both dike core and dikecover materials resulting in economical, environmentally...
-
Low and high energy explosive materials used in shale gas recovery
PublikacjaNowadays the explosives are widely used in many areas of life, including industry and mining. A wide range of explosive materials is used in the petroleum industry - from low to high explosives. Recently, as the unconventional oil and gas production became possible, explosives are also found to be used in perforators during the pre-completion stage of the fracturing process. This paper presents literature on theoretical and practical...
-
Raman spectra of PCMCA-X (potassium citrate derived porous carbon materials obtained at various temperatures of carbonization)
Dane BadawczeThese data contain Raman spectra of PCMCA-700 (potassium citrate derived porous carbon materials obtained at 700°C ), PCMCA-800 (potassium citrate derived porous carbon materials obtained at 800°C ), PCMCA-900 (potassium citrate derived porous carbon materials obtained at 900°C ). The D peak at 1340 cm−1 and the G peak at 1592 cm−1 can be seen in all...
-
Analysis of the torque response of a car engine to the step change of the control signal
PublikacjaW pracy zamieszczono wyniki badań silnika samochodu osobowego w warunkach nieustalonych. Stan obciążenia silnika wynikał z realizowanego cyklu jezdnego w warunkach drogowych oraz sposobu sterowania układem napędowym. Parametry trakcyjne pojazdu mierzone były za pomocą systemu GPS z fenomenologiczną korektą sygnału wysokości, na której się on znajdował. Wybrane parametry pracy silnika mierzone były za pomocą sytemu komunikującego...
-
Carbon dioxide ocean and ground storage as a method of climate change mitigation
PublikacjaW pracy dokonano krytycznego przeglądu negatywnego wpływu globalnego ocieplenia na środowisko i przedstawiono dwie nowatorskie metody zmniejszenia stężenia atmosferycznego ditlenku węgla. Obie metody: magazynowanie antropogenicznego ditlenku węgla, pochodzącego z dużych źródeł emisji, w oceanach i w glebie są technologicznie możliwe do przeprowadzenia, co potwierdzają przykłady z różnych regionów świata. W pracy przedyskutowano...
-
Tropospheric thermal field variability over Poland in the context of climate change
Publikacja -
Tendencies of change in the chemistry of precipitation at three monitoring stations 1996-1999.
PublikacjaW pracy przedstawiono wyniki porównawczych badań składu próbek opadów deszczowych zebranych na trzech stacjach w okresie 1996-1999, (stacje te różnią się zdecydowanie ze względu na usytuowanie geograficzne). W postaci graficznej przedstawiono zaobserwowane tendencje w składzie zebranych próbek wód opadowych.
-
Numerical single-phase modeling of turbulent flow and heat transfer of nanofluids
PublikacjaIn this work, Nusselt number and friction factor are calculated numerically for turbulent pipe flow (6 000< Re < 12 000) with constant heat flux boundary condition using nanofluids. The nanofluid is modelled with the single-phase approach and the simulation results are compared with published experimental data.
-
Single-phase power electronics transformer with active functions for smart grid
PublikacjaThis paper presents the control of one cell of a modular single-phase power electronics transformer with active functions for meeting the smart grid concept. In this way, the converter could be used not only as a conventional transformer but also for grid such as reactive power, harmonic elimination and energy storage. The topology of the cell is composed by a bidirectional converter with three stages: a half bridge in the input...
-
The dispersive micro-solid phase extraction method for MS-based lipidomics of human breast milk*
PublikacjaA simple and rapid microextraction method ensuring high lipidome coverage was developed for liquid chromatography mass spectrometry (LC-MS)-based lipidomics of human breast milk. The dispersive microsolid phase extraction (D-µ-SPE) technique, coupled with the design of experiment (DoE) method, enabled the study of the influence of several conditions (desorption solvent, stationary phase ratio, and sorption and desorption time)...
-
Determination of thiocyanate as a biomarker of tobacco smoke constituents in selected biological materials of human origin
Publikacjan order to protect human health, it is necessary to biomonitor toxic substances originating from tobacco smoke in biological materials sampled from persons with different exposures to tobacco smoke constituents. Thiocyanate anion is a biomarker of exposure to tobacco smoke components which is characterized by a relatively long half‐life in the human body, i.e. 6 days. In this work, we present the results of thiocyanate determinations...
-
Determination of leakage inductances of multi-winding and single-phase transformer
PublikacjaThis paper presents the method for determination of leakage inductances of single-phase and multi-winding transformer. The matrix of leakage inductances takes into account leakage self and also leakage mutual magnetic couplings. It is assumed that there is a flux common to all windings and several leakage fluxes referred to a particular winding. The flux linkages of each coil needed fo calculation of leakage inductances was computed...
-
XRD pattern of Mo2Ga2C, Mo2CTx/Mo2GaC and Ni-Mo2CTx/Mo2Ga2C materials
Dane BadawczeIn the dataset are included raw data for the preparation of XRD pattern of Mo2Ga2C, Mo2CTx/Mo2GaC and Ni-Mo2CTx/Mo2Ga2C materials.
-
Two-phase flow in heterogeneous porous media with non-wetting phase trapping
PublikacjaThis article presents amathematical model describing flowof two fluid phases in a heterogeneous porous medium. Zaproponowano model matematyczny przepływu dwufazowego w drobnoziarnistym ośrodku porowatym zawierającym inkluzje gruboziarniste. Inkluzje charakteryzują się niższą wartością ciśnienia wejścia dla płynu niezwilżającego (np. powietrze, ropa naftowa) niż materiał podstawowy. Podczas nawadniania takiego ośrodka dochodzi do...
-
Experimental comparison of hydrodynamic thrust bearings with different pad surface materials
PublikacjaBabbitt is the material most frequently used as the pad surface material for hydrodynamic bearings operating at usual operating conditions. It shows many advantages important for safe bearing operation, as for example: low friction coefficient, corrosion resistance, fair mechanical properties and outstanding conformability. On the other hand, it is not free from disadvantages, such as limited fatigue strength or limited resistance...
-
Application of organic materials in electronics
PublikacjaRozwój urządzeń elektronicznych na bazie materiałów organicznych przestawia jedno z najbardziej spektakularnych osiągnięć nauki w XXI wieku. Do produkcji zostały wdrożone urządzenia zbudowane na cienkich warstwach organicznych, i poczynione zostały pierwsze kroki w kierunku rozwoju elektroniki molekularnej. Celem publikacji jest dostarczenie podstawowych informacji dotyczących urządzeń elektronicznych zbudowanych na bazie cienkich...
-
Conductivity and superconductivity in granular materials
PublikacjaMetale i nadprzewodniki granulaste są bardzo ciekawymi materiałami dzięki jednoczesnej obecności oddziaływań kulombowskich, tunelowania elektronów i par Coopera oraz różnych zjawisk związanych z nieuporządkowaniem. W pracy przedstawiono i porównano niektóre właściwości granulastych nisko- i wysokotemperaturowych nadprzewodników. Granulasty nadprzewodnik wysokotemperaturowy otrzymano metodą krystalizacji w fazie stałej szkła (Bi,Pb)-Sr-Ca-Cu-O....
-
An investigation on wetting of porous materials
PublikacjaPośrednie metody oceny zdolności zwilŜania drobnych cząstek lub materiałów porowatych wymagają wyboru cieczy odniesienia, dla której kąt zwilŜania jest równy zeru. W badaniach własnych zastosowanometodę wzniesienia kapilarnego oraz metodę flotacji filmowej dla układów mikrokulki szklane-woda i mikrokulki szklane-dekan. Uzyskane dane dla cieczy odniesienia i dla cieczy badanej wprowadzano dozmodyfikowanego równania Washburn'a i...
-
Determination of molybdenum in biological materials
Publikacja -
Modelling of engineering materials with microstructure
PublikacjaArtykuł omawia różne modele do opisu lokalizacji odkształceń w postaci rys i stref ścinania w materiałach budowlanych takich jak grunt i beton. Zastosowane modele mechaniki ośrodka ciągłego i modele dyskretne.
-
Sampling selected solid materials
PublikacjaW pracy przedstawiono: ogólne zasady pobierania próbek gleby, osadów dennychi innych materiałów stałych; opis urządzeń do pobierania próbek materiałówstałych; techniki przygotowania pobranych próbek do analizy.
-
Evidence for SrHo2O4 and SrDy2O4 as model J1- J2 zigzag chain materials
PublikacjaNeutron diffraction and inelastic spectroscopy is used to characterize the magnetic Hamiltonian of SrHo2O4 and SrDy2O4. Through a detailed computation of the crystal-field levels we find site-dependent anisotropic single-ion magnetism in both materials, and diffraction measurements show the presence of strong one-dimensional spin correlations.Our measurements indicate that competing interactions of the zigzag chain, combinedwith...
-
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...
-
A gap waveguide-based mechanically reconfigurable phase shifter for high-power Ku-band applications
PublikacjaThis paper presents a novel design of a low-loss, reconfgurable broadband phase shifter based on groove gap waveguide (GGW) technology. The proposed phase shifter consists of a folded GGW and three bends with a few pins forming the GGW and one bend attached to a movable plate. This movable plate allows for adjustments to the folded waveguide length, consequently altering the phase of electromagnetic waves. The advantage of GGW...
-
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...
-
Numerical Simulations of Seepage in Dikes Using unsaturated and Two-Phase Flow Models
PublikacjaModeling of water flow in variably saturated porous media, including flood dikes, is often based on the Richards equation, which neglects the flow of pore air, assuming that it remains at constant atmospheric pressure. However, there is also evidence that the air flow can be important, especially when the connectivity between the pore air and atmospheric air is lost. In such cases a full two-phase air-water flow model should be...
-
Wastes from Agricultural Silage Film Recycling Line as a Potential Polymer Materials
PublikacjaThe recycling of plastics is currently one of the most significant industrial challenges. Due to the enormous amounts of plastic wastes generated by various industry branches, it is essential to look for potential methods for their utilization. In the presented work, we investigated the recycling potential of wastes originated from the agricultural films recycling line. Their structure and properties were analyzed, and they were...
-
Observation on red blood cells fluctuations by diffraction phase microscopy
PublikacjaNowadays there is quite huge need for more and more precise and effective fast diagnostics methods in hematology diseases. One of the most important blood components are erythrocytes – Red Blood Cells (RBCs). Due to their size they are easy to observe using microscopy. It is commonly known that the shape and lifetime of RBCs allows for early disease identification. Authors present special measurement system for RBCs fluctuations...
-
Towards large-scale application of nanoporous materials in membranes for separation of energy-relevant gas mixtures
PublikacjaMembranes containing nanoporous materials (such as zeolites, metal–organic materials and 2D materials such as graphene derivatives) may allow more efficient separation of gas mixtures relevant to emerging energy technologies. For example, such membranes could be applied in the separation of gases containing mixtures of carbon dioxide (CO2) and hydrogen (H2). However, these membranes are currently at a relatively low technology...
-
The effect of ionic liquids on the surface and photocatalytic properties of semiconducting materials
PublikacjaSemiconductor-mediated photocatalysis represents an environmentally friendly technology that could be used for the degradation of different pollutants in the gas and aqueous phases, for hydrogen generation, and for CO2-to-valuable product transformation reactions. Therefore, it is extremely important to accurately design a photocatalyst with the relevant features. In recent years, ionic liquids have often been employed as reagents...
-
The effect of pH change of oxyteracycline solutions on the on inhibition of bioluminescence of Vibrio fischeri (Microtox)
Dane BadawczeIn this study attempt was also made to determine whether a pH change of the sample containing oxyteracycline solutions affects the total toxicity of the sample using the Microtox®
-
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...