Search results for: ferryt
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Badania skłonności do pękania zimnego złączy doczołowych ze stali typu dupleks 2205 wykonanych w środowisku wodnym
PublicationW pracy zbadano skłonność stali dupleks 2205 do tworzenia pęknięć zimnych. Wykonano technologiczne próby Tekken w warunkach podwodnych metodą mokrą z wykorzystaniem elektrod otulonych. Przedstawiono wyniki badań twardości, badań metalograficzny makro i mikroskopowych oraz badań zawartości ferrytu.
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Generating sequences of Lefschetz numbers of iterates
PublicationDu, Huang and Li showed in 2003 that the class of Dold–Fermat sequences coincides with the class of Newton sequences, which are defined in terms of socalled generating sequences. The sequences of Lefschetz numbers of iterates form an important subclass of Dold–Fermat (thus also Newton) sequences. In this paper we characterize generating sequences of Lefschetz numbers of iterates.
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Wpływ mikrostruktury na własności magnetyczne stali 10H2M
PublicationBadano mikrostrukturę i własności magnetyczne stali 10H2M o różnych stopniach degradacji. Stwierdzono, że natężenie emisji magnetoakustycznej jest skorelowane z wydzieleniami węglikowymi w obszarze ziarn ferrytu. Istnienie tej korelacji jest prawdopodobnie wynikiem wpływu jaki wywierają wydzielenia na siłę kotwiczenia granic domenowych.
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Stabilność struktury stali austenityczno-ferrytycznej po wyżarzaniu w wysokich temperaturach.
PublicationPrzeprowadzono badania przemian strukturalnych w stali austenityczno-ferrytycznej typu dupleks zachodzących w wysokich temperaturach. Stal poddano wyżarzaniu w zakresie 600-900°C w czasie od 6 do 6000 min. Wykazano i opisano ilościowo przemiany ferrytu w austenit wtórny i fazy międzymetaliczne
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SEM images of SFM, LSFM and SFMNb in as-prepared state and reduced
Open Research DataThis dataset contains SEM images taken for pristine strontium ferrite molybdate, as well as ones doped with lanthanum or niobium. Materials were characterized in powder, under high vacuum in secondary electron mode. The images are divided into folders for as-prepared samples and reduced (H2, 800 deg, 4 h) ones.
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APPLICATION OF MAGNETIC NANOPARTICLES FOR WATER TREATMENT
PublicationIn this study magnetic nanoparticles were fabricated and used for water treatment. Nanoparticles were prepared in two ways. The first one involved NiZn ferrite nanoparticles synthesized by co-precipitation of metal cations with sodium hydroxide at high temperature. The second one featured maghemite nanoparticles was prepared by saltassisted solid-state reaction. Modification and functionalization of nanoparticles surface was investigated....
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Lokalizacja osób w środowisku promu pasażerskiego z wykorzystaniem ultra szerokopasmowego interfejsu radiowego
PublicationW niniejszym artykule przedstawiono badania efektywności lokalizowania poruszających się osób w środowisku promu pasażerskiego stosując pomiar czasu propagacji ultraszerokopasmowego sygnału radiowego UWB (Ultra-Wide Band) pomiędzy węzłami odniesienia i terminalem ruchomym. Opisano zbudowane stanowisko badawcze oraz uzyskane wyniki pomiarów przeprowadzonych w warunkach rzeczywistych.
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Badanie korelacji efektu emisji magnetoakustycznej ze zmianami mikrostruk- tury stali 10H2M. Zesz. Probl. - Badania Nieniszczące.**2003 nr 8 s. 67-70, 5 rys. bibliogr. 5 poz. Materiały 32 Krajowej Konferencji Badań Nieniszczących 32 KKBN. Międzyzdro-je 28-30. X. 2003 r.
PublicationPrzedstawiono wyniki badania korelacji efektu emisji magnetoakustycznej zezmianami mikrostruktury stali 10H2M w trakcie procesu degradacji. Rozwójkształtu i koncentracji wydzieleń wewnątrz ziarna i na granicy ziaren badanoanalizując obrazy mikrostruktury z mikroskopu skaningowego. Wykazano, że za-nik natężenia emisji magnetoakustycznej jest skorelowany ze wzrostem szero-kości wydzieleń na granicy ziaren ferrytu.
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The Effect of Welding Conditions on Mechanical Properties of Superduplex Stainless Steel Welded Joints
PublicationThe tests results of superduplex stainless steel welded joints made with a different heat input, using automatic submerged arc welding (SAW) and semi-automatic flux-cored arc welding (FCAW) have been presented. Metallographic examinations, the measurements of the ferrite content, the width of the heat affected zone (HAZ) and the hardness of the welds in characteristic areas have been performed. Significant differences in the amount of...
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The influence of the welding thermal cycles on corrosion resistance of duplex stainless steel
PublicationBadano skłonnośc strefy wpływu ciepła spoin ze stali dupleks do korozyjnego pękania narężeniowego. Wykonano próby korozyjne z wykorzystaniem metody SSRT w środowisku korozyjnym wrzącego MgCl2. Wykazano, że duży udział ferrytu w strukturze SWC pogarsza odpornośc na korozję. Badania metalograficzne na mikroskopie lektronowym wykazały różne sposoby propagacji pęknięcia zależnie od zawartości austenitu w strukturze SWC.
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Testing the Diagnostic Utility of Recombinant Toxoplasma Gondii Chimeric Antigens – Generated Datasets
PublicationThe datasets titled Toxoplasma gondii recombinant chimeric antigens – IgM and IgG ELISAs – mouse serum samples and Toxoplasma gondii recombinant chimeric antigens – IgG and IgM ELISAs – human serum samples contain absorbance measurements obtained during serological tests using mouse and human sera in enzyme-linked immunosorbent assay (ELISA) tests based on recombinant chimeric antigens. The datasets allows a comparison of absorbance...
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Stratification of nano-pigments in anti-corrosive coatings by means of magnetic field
PublicationThe concept of self-stratification of coatings, although attractive, causes difficulties in its practical use, especially when pigments are added to the resins. An alternative way of obtaining a multilayer structure in a single step was presented. Using the inhomogeneous magnetic field and magnetically active components of the coating, the possibility of vertically graded differentiation of the one layer properties has been verified....
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Investigations of the isolators containing microstrip FCL section
PublicationW pracy opisany został projekt układu izolatora zawierającego podłużnie magnesowane ferrytowe sprzężone linie mikropaskowe (FCL). W warstwowej strukturze układu ferryt został wprowadzony jako nakładka. Obciążenie w układzie izolatora zostało zrealizowane na dwa sposoby: jako obciążenie współosiowe oraz jako mikopaskowy układ planarny zawierający skupiony rezystor. Uzyskane z symulacji wyniki zostały zweryfikowane eksperymentalnie....
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Edge-Guided Mode Performance and Applications in Nonreciprocal Millimeter-Wave Gyroelectric Components
PublicationThe analogies between the behavior of gyromagnetic and gyroelectric nonreciprocal structures, the use of the simple transfer matrix approach, and the edge-guided (EG) wave property, supported in a parallel plate model for integrated magnetized semiconductor waveguide, are investigated in those frequency regions, where the effective permittivity is negative or positive. As with their ferrite counterparts, the leakage of the EG waves...
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Protective and Suppressing Electromagnetic Interference Properties of Epoxy Coatings Containing Nano-Sized NiZn Ferrites
PublicationNano-crystalline ferrites with the chemical formula NixZn(1−x)Fe2O4, where x = 0, 0.2, 0.4, 0.6, 0.8, 1.0, were synthesized using a co-precipitation method. The obtained ferrites were investigated by X-ray diffraction (XRD). The corrosion inhibiting behavior of nano-sized ferrites was tested using carbon steel samples and 10% aqueous ferrite extracts. Results were compared with previous data obtained for micro-sized ceramic ferrites....
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Comparison of selected parametric methods for prediction of inland waterways ship hull resistance in towing tank test
PublicationIn the paper selected approximate methods for calculation of inland waterways ship resistance and their verification by towing tests, compared on the example of a small urban ferry, are presented. The test results are made for both the bare hull and the hull with appendages (skeg, azimuthal propeller). Significant differences between results of the theoretical methods and experimental ones, especially in the case of the model with...
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The XAS spectra of O-K edges, Fe-L edges in pristine, La-, and Nb-doped SFM in 3 states: as-prepared, reduced and reoxidized
Open Research DataThis dataset contains the normalized and exported to *.txt spectra for x-ray absorption spectroscopy. The samples analyzed were strontium ferrite molybdate based, doped with lanthanum and niobium. The powders were measured in as-prepared state (denoted in filename as AP), reduced (red) and reoxidized (reox). The filenames are written accordingly: Edge_(optional:...
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Napawanie elementów wymiennika ciepła austenitycznym drutem proszkowym
PublicationNa potrzeby przemysłu energetycznego produkuje się wymienniki ciepła przeznaczone do eksploatacji w warunkach agresywnych chemicznie, np. w środowisku siarkowodoru. Z przyczyn ekonomicznych często stosuje się w takim przypadku materiały bimetaliczne wytwarzane procesami napawania. W artykule przedstawiono wyniki badań nieniszczących, pomiarów twardości, analizy składu chemicznego, pomiarów ferrytu delta oraz badań makro- i mikroskopowych...
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Wpływ temperatury przesycania na właściwości złączy spawanych rur ze stali typu Lean Duplex 2101
PublicationW artykule przedstawiono wpływ temperatury przesycania w powiązaniu z technologią spawania wzdłużnego metodą TIG (142) rurek stosowanych w budowie wy-mienników ciepła ze stali Lean Duplex 2101. Przedstawiono wyniki badań wytrzymałości na rozciąganie, prób technologicznych określających właściwości plastyczne, makro- i mikro-skopowe oraz pomiaru zawartości ferrytu delta metodą magnetyczną. Ustalono, że zmiana temperatury przesycania...
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Results after grinding C45 steel
Open Research DataThe database contains results from nanoindenter, scanning microscope and also X-ray diffractometer. To determine the residual stresses and the size of the crystallites in the ferrite grains in the grinded surface layer, the Williamson Hall analysis of the X-ray diffraction patterns was performed. XRD diffraction patterns were also used to perform a...
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Kinetics of Intermetallic Phase Precipitation in Manual Metal Arc Welded Duplex Stainless Steels
PublicationThe article presents the influence of heat treatment on the kinetics of transformations in lean duplex LDX2101 steel and a weld made of standard duplex 2209 material, which was welded by manual metal arc welding. Changes in the microstructure, hardness, and magnetic phase content were analyzed after heat treatment was conducted at a temperature of 800 °C for a period ranging from 15 to 1440 min. Light and scanning microscopy, Vickers...
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Laser Dissimilar Welding of AISI 430F and AISI 304 Stainless Steels
PublicationA dissimilar autogenous laser welded joint of AISI 430F (X12CrMoS17) martensitic stainless steel and AISI 304 (X5CrNi18-10) austenitic stainless steel was manufactured. The welded joint was examined by non-destructive visual testing and destructive testing by macro- and microscopic examination and hardness measurements. With reference to the ISO 13919-1 standard the welded joint was characterized by C level, due to the gas pores...
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Detection of Toxoplasma gondii oocysts in environmental samples
PublicationToxoplasma gondii is an obligate intracellular parasite that has capacity to infect warm-blooded animals. Human toxoplasmosis is usually asymptomatic, whereas severe complications may occur in immunocompromised patients (e.g. AIDS) or in case of congenitalinfection. One of the sources of acquiring human toxoplasmosis is ingestion of T. gondii oocysts. It is known that newly infected cats can shed millions of oocysts into the environment,...
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Detection of Toxoplasma gondii in meat - available techniques
PublicationToxoplasma gondii, which belongs to the phylum Apicomplexa, is an absolute intercellular parasite that infects a wide range of hosts, including warm-blooded animals and humans. An infection with this parasite causes toxoplasmosis, which in most cases remains latent. However, this disease is a major threat to immunocompromised people and pregnant women. In extreme cases, it can damage nervous system or case fatal abortion. Infected...
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Problem reakcji krzyżowych w immunodiagnostyce na przykładzie neosporozy i toksoplazmozy
PublicationW niniejszej pracy przedstawiono problem reakcji krzyżowych występujących w immunodiagnostyce chorób zakaźnych. Zagadnienie opisano szerzej na przykładzie dwóch blisko spokrewnionych pasożytów należących do typu Apicomplexa - Neospora caninum i Toxoplasma gondii. Zaprezentowano także, sposoby ulepszania testów wykorzystywanych w diagnostyce neosporozy i toksoplazmozy u zwierząt.
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Reakcje krzyżowe w immunodiagnostyce
PublicationZaprezentowano problem reakcji krzyżowych w immunodiagnostyce.
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Nieswoiste zapalenie jelit
PublicationNieswoiste zapalenie jelit jest przewlekłą, nieuleczalną choroba zapalną układu pokarmowego. W niniejszej pracy przedstawiono dane epidemiologiczne, możliwe przyczyny wystąpienia choroby oraz opisano dwie główne jednostki chorobowe zaliczane do nieswoistego zapalenia jelit takie jak wrzodziejące zapalenie jelita grubego oraz choroba Leśniowskiego-Crohn'a.
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Podłoże nieswoistego zapalenia jelit
PublicationZaprezentowano możliwe czynniki ryzyka wystąpienia nieswoistego zapalenia jelit.
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Analysis of features of stainless steels in dissimilar welded joints in chloride inducted corrosion
PublicationStainless steels of femtic-austenitic microstructure that means the duplex Cr-Ni-Mo steels, in comparison with austenitic steel includes less expensive nickel and has much better mechanical properties with good formability and corrosion resistance, even in environments containing chloride ions. Similar share of high chromium ferrite and austenite, which is characterized by high ductility, determines that the duplex steels have...
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Kagome Lattice Promotes Chiral Spin Fluctuations
PublicationDynamical spin fluctuations in magnets can be endowed with a slight bent toward left- or right-handed chirality by Dzyaloshinskii-Moriya interactions. However, little is known about the crucial role of lattice geometry on these chiral spin fluctuations and on fluctuation-related transport anomalies driven by the quantum-mechanical (Berry) phase of conduction electrons. Via thermoelectric Nernst effect and electric Hall effect experiments,...
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Skłonność do tworzenia pęknięć zimnych złączy ze stali ferrytyczno-austenitycznej typu dupleks 2205 przy spawaniu pod wodą metodą mokrą
PublicationSpawanie pod wodą stali ferrytyczno-austenitycznych typu dupleks budzi coraz szersze zainteresowanie. Wynika to z pilnej potrzeby opracowania spawalniczych technologii naprawczych rurociągów do transportu ropy naftowej eksploatowanych pod wodą. Do badań wykorzystano metodę mokrą przy zastosowaniu spawania elektrodami otulonymi (proces 111). Wykonano technologiczne próby Tekken pod wodą na głębokości 0,5 m oraz na powietrzu. Przeprowadzono...
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Spawanie podwodne stali dupleks odpornej na korozję
PublicationW artykule przedstawiono wyniki badań spawalności stali dupleks w warunkach podwodnych. Zainteresowanie spawaniem podwodnym tej grupy stali wiąże się z koniecznością opracowania spawalniczych metod naprawczych rurociągów eksploatowanych w przemyśle wydobywczym ropy naftowej. Do badań wykorzystano metodę spawania GMA za pomocą lokalnej komory suchej. Wykonano napoiny pod wodą na głębokości 0,5 m oraz na powietrzu przy zbliżonych...
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The exemplary Kelvin probe microscopy studies of sensitized austenitic stainless steels
Open Research DataThe dataset summarizes the results of imaging the surface potential distribution using the Kelvin probe scanning technique. Due to the fact that the potential measured in this way is proportional to the electrochemical potential of metals or intermetallic phases, it is possible to assess the nobility differences of various alloy components. In the case...
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The electrical conductivity of pristine, La-, and Nb-doped SFM measured in air and hydrogen atmospheres
Open Research DataThis dataset consists of an Excel sheet with the result of DC4W method of electrical measurements. The measurements were conducted on pristine strontium ferrite molubdate as well as ones doped with La and Nb. Additionally two samples co-doped with La and Ni/Co were analyzed. Pellets were prepared by high temperature sintering at 1400 deg. C, then cut...
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Insight into (Electro)magnetic Interactions within Facet-Engineered BaFe12O19/TiO2 Magnetic Photocatalysts
PublicationA series of facet-engineered TiO2/BaFe12O19 composites were synthesized through hydrothermal growth of both phases and subsequent deposition of the different, faceted TiO2 nanoparticles onto BaFe12O19 microplates. The well-defined geometry of the composite and uniaxial magnetic anisotropy of the ferrite allowed alternate interfaces between both phases and fixed the orientation between the TiO2 crystal structure and the remanent...
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CAPABILITY OF IDENTIFYING AND PREDICTING THE TECHNICAL CONDITION OF PLATE HEAT EXCHANGERS IN OPERATION
PublicationThe paper presents a test stand for plate heat exchangers, allowing to identify the technical condition and to predict durability of the heat exchangers used aboard the sea-going ships: ”Oceanograf”, ”Władysław Orkan”and a passenger-car ferry, under the condition that they are of the same type and manufactured by the same company. In the first part three different installations with plate heat exchangers in the engine rooms...
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The usefulness of Toxoplasma gondii MIC1-MAG1-SAG1 chimeric antigen in the serodiagnosis of ovine toxoplasmosis
PublicationToxoplasmosis is a zoonotic disease caused by the protozoan Toxoplasma gondii, which infects humans and most warm-blooded animals throughout the world. Although human toxoplasmosis in healthy adults is usually asymptomatic, a serious disease can occur in the case of congenital infection and immunocompromised individuals. Among food animals, sheep, along with goats and pigs, possess the highest incidence of T. gondii cysts in meat,...
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Experimental study on the selected aspects of bow thruster generated flow field at ship zero-speed conditions
PublicationThe paper presents the results of experimental study on the interaction between the bow thrusters understood as the flow field changes generated by bow tunnel thruster in deep water conditions operated as a single and twin units. The research was limited to zero-speed case for the ship dead in the water. The influence of the hull form and jet spread between the neighbouring thrusters for several combinations of the applied bow...
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The influence of solution annealing temperature on the properties of Lean Duplex 2101 welded joints in tubes
PublicationThe article presents a technology of TIG longitudinal welding without filler material (142) of heat exchanger tubes made of Lean Duplex 2101. The results of studies on the effect of heat treatment (solution annealing) on tensile strength, plasticity, delta ferrite and the structure of smooth tubes are shown. It was found, that the change in solution annealing temperature across the tested range has an impact on mechanical properties...
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Właściwości elektryczne i magnetyczne szkła Fe2O3 – SiO2 – PbO
PublicationSzkło Fe2O3–SiO2–PbO wydaje się być obiecującym materiałem do zastosowań w urządzeniach elektrycznych takich jak rdzenie cewek, czujniki pola magnetycznego oraz mikrotransformatory. Jest to spowodowane korzystnymi właściwościami takimi jak stosunkowo wysoka rezystywność oraz w miarę duża przenikalność magnetyczna. Pierwsza wymieniona cecha skutkuje brakiem strat energii na prądy wirowe. Natomiast druga cecha oznacza potencjalną...
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Przedsiębiorczość i innowacyjność - czy wykorzystamy tę szansę ?
PublicationArtykuł zawiera analizę szans regionu pomorskiego w sytuacji wstąpienia Polski do UE. Wymieniane są czynniki mogące określić przewagę konkurencyjną regionu. Wykorzystano tu ramy analizy teoretycznej Portera, Perry`ego, Nalebuffa i Branderburgera. Autor koncentruje się na czynnikach związanych z przedsiębiorczością i innowacyjnością.
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Real-Time PCR: molecular technique of many applications
PublicationReal-Time PCR is a sensitive DNA amplification technique initially applied in genetics and molecular biology. It enables in vivo copying of the selected DNA fragment (flanked by two primers) by the thermostable polymerase (in the presence of magnesium ions and deoxynucleotide triphosphates) and simultaneous measurement of the fluorescence. For one or more specific sequences in a DNA sample, real-time PCR enables both detection...
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PCR-ELISA: inexpensive alternative to quantitative PCR
PublicationPCR-ELISA (polymerase chain reaction-enzyme linked immunosorbent assay), a combination of PCR and ELISA methods, has been used since late 1980s. The technique is based on specially labelled DNA fragments which are captured by specific DNA sequences and detected by antibodies. The whole procedure of PCR-ELISA is divided into three steps: DNA extraction, PCR reaction and detection by ELISA. The method has been found as very specific...
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Sustainable development model for measuring and managing sustainability in the automotive sector
PublicationA growing number of organizations across a variety of industries are now pursuing sustainable management business goals to improve business efficiency, manage stakeholder expectations, or for legislative compliance. This is also the case for automotive manufacturing organizations who are under pressure from their stakeholders to manage and improve sustainability performance. This requires the development of credible measurement...
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Application of dynamic impedance spectroscopy to scanning probe microscopy.
PublicationDynamic impedance spectroscopy, designed for measuring nonstationary systems, was used in combination with scanning probe microscopy. Using this approach, impedance mapping could be carried-out simultaneously with topography scanning. Therefore, correlation of electrical properties with particular phases of an examined sample was possible. The sample used in this study was spheroidal graphite cast iron with clearly defined phases...
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Determination of Mathematical Model Parameters of a Medium Frequency Transformer
PublicationThe paper presents the results of experimental studies of the medium frequency transformer. The object of the research was a prototype of a single-phase transformer with a core made of ferrite I-core elements and windings made of Litz conductors. The research was carried out to determine the parameters of the transformer's mathematical model. The scope of the tests included determining the magnetic hysteresis loop and measuring...
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THE EFFECT OF WET UNDERWATER WELDING ON COLD CRACKING SUSCEPTIBILITY OF DUPLEX STAINLESS STEEL
PublicationABSTRACT The present work was conducted to assess the weldability of duplex stainless steel in underwater conditions. Metal manual arc welding (MMA) with the use of coated electrodes was used in the investigations. Tekken weldability tests were performed underwater at 0.5 m depth and in the air. Nondestructive tests, metallographic examinations of welds, ferrite content assessment in microstructure and hardness test were performed....
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Effect of Linear Energy and Microstructure on the Content of Residual Hydrogen in Welded Joints made of Superduplex Steels
PublicationThe article presents tests concerning the content of retained hydrogen present in FCAW and SAW welded joints made of superduplex steel. The use of various welding technologies resulted in the obtainment of welds having different microstructures and ferrite contents. Measurements of retained hydrogen present in joints (performed using the complete combustion method) revealed various contents of hydrogen in the base material and...
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Oil refinery dusts: morphological and size analysis by TEM
PublicationThe objectives of this work were to develop a means of sampling atmospheric dusts on the premises of an oil refinery for electron microscopic study to carry out preliminary morphological analyses and to compare these dusts with those collected at sites beyond the refinery limits. Carbon and collodion membranes were used as asupport for collection of dust particles straight on transmission electron microscopy (TEM) grids. Micrographs...
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AFM analysis of duplex steel structure and composition
Open Research DataDue to the high content of alloying elements, duplex stainless steels are characterized by a complex structure of phase transitions. Among all types of intermetallic compounds, the sigma phase is of major interest due to its detrimental effect on both mechanical properties and corrosion behavior. It is an intermetallic phase enriched in Cr and Mo and...