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Wyniki wyszukiwania dla: drgania obrabiarek
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The changes of crosslink density of polyurethanes synthesised with using recycled component. Chemical structure and mechanical properties investigations.
PublikacjaThis paper aims at the utilisation of glycerolysate (Gly) obtained in polyurethane recycling process by means of crude glycerine, which has in its structure hydroxyl end groups that allow for further processing. Polyurethanes (PUs) were synthesised using prepolymer method with the mixture of neat polyol and glycerolysate, in different ratios, with 4,4-diphenylmethane diisocyanate (MDI). The prepolymer was subsequently extended...
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Degradation of protective coatings in steel chimneys of flue gas desulfurisation system
PublikacjaThis paper presents problems associated with corrosion of steel stacks and changes in philosophy of corrosion protection when implemented into flue gas desulphurization systems. In-situ tests were taken by means of electrochemical impedance spectroscopy at the stack which discharges flue gas before wet lime/limestone desulphurization. A very quick electrolyte absorption by the spherical infill vinylester coating was found using...
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An attempt to mechanistically explain the viscoelastic behavior of transparent epoxy/starch-modified ZnO nanocomposite coatings
PublikacjaThe effects of bare and starch-modified ZnO (ZnO-St) nanoparticles on viscoelastic and mechanical properties are studied by dynamic mechanical and tensile analyses. Transparent epoxy-based nanocomposite films are prepared by incorporating bare or starch-modified ZnO particles into the epoxy matrix. The results demonstrated that ZnO particles hindered the curing reactions and hence the final properties of the cured epoxy. As a result,...
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Flame retardant epoxy/halloysite nanotubes nanocomposite coatings: Exploring low-concentration threshold for flammability compared to expandable graphite as superior fire retardant
PublikacjaEpoxy nanocomposites containing halloysite nanotubes (HNTs) were developed and their low-concentration thresholds for thermal stability and flame retardancy were compared with that of epoxy system containing expandable graphite (EG), as a reference with superior flame retardancy. The effects of HNTs and EG on the peak of Heat Release Rate (pHRR), Total Heat Release (THR), and Time-To-Ignition (TTI) of the prepared samples were...
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Novel application of dynamic electrochemical impedance monitoring to a cataphoretic coating process
PublikacjaThe paper presents a novel method of on-line impedance monitoring of cataphoretic coating application process. Utilization of dynamic electrochemical impedance spectroscopy (DEIS) overcame the fundamental problem connected with non-stationarity of the aforementioned coating deposition process, which eliminates classical impedance spectroscopy technique from a real-time description of cataphoresis. The paper illustrates selected examples...
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Stratification of nano-pigments in anti-corrosive coatings by means of magnetic field
PublikacjaThe 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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Sensing the onset of epoxy coating degradation with combined Raman spectroscopy/atomic force microscopy/electrochemical impedance spectroscopy
PublikacjaThe paper presents the results of investigation on epoxy resin durability upon 12-week exposure to UV radiation. The aim was early determination of the onset of epoxy degradation and for this purpose an epoxy film on steel substrate systems were periodically inspected using Raman spectroscopy, atomic force microscopy and electrochemical impedance spectroscopy. The behaviour of examined polymer could be divided into three periods: immunity,...
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Benzophosphol-3-yl Triflates as Precursors of 1,3-Diarylbenzophosphole Oxides
PublikacjaAsimplemethodforthesynthesisof3-arylbenzophospholeoxidesunderSuzuki−Miyauracouplingconditionshasbeenpresented.Itemploysbenzophosphol-3-yltriflatestartingmaterialswhich,priortoourwork,hadnotbeenusedforthesynthesisof3-arylbenzophospholeoxides.Thereactionsproceedover24handprovidealibraryof3-arylbenzophospholeoxides.Thesyntheticaccesstothebenzophosphol-3-yltriflateshasbeenimproved.Thepreliminaryphotophysicalpropertiesofsome3-arylbenzophospholeoxideshavebeeninvestigatedbyabsorptionandemissionmeasurements.Thetheoreticalcalculationswereperformedtoestablishstructure−propertyrelationships.
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Ring Opening of Triflates Derived from Benzophospholan-3-one Oxides by Aryl Grignard Reagents as a Route to 2‑Ethynylphenyl(diaryl)phosphine Oxides
PublikacjaA new simple method for the synthesis of 2-ethynylphenyl(diaryl)phosphine oxides via ring opening of benzophosphol-3-yl triflates has been developed. This process occurs via nucleophilic attack of a Grignard reagent at the phosphorus center, which results in ring opening and cleavage of a leaving group. The reaction proceeds under mild conditions and, within 15−60 min, leads to a library of previously unavailable 2-ethynylphenylphosphine...
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Manganese(III) Promoted Cyclization of N-alkenyl-N-(2-hydroxyethyl) amides to Iso-Oxacepham Potent β-Lactamase Inhibitors
PublikacjaBackground: β-Lactams are still a subject of interest of organic chemists. The main reason for this interest is due to their application as a chemotherapeutic. β-Lactam antibiotics are still the most commonly used drugs in bacterial infections. Method: Methods using 4-exo-trig radical cyclization leading to β-lactams are an alternative to classical Staudinger`s β-Lactams formation. We prepared N-alkenyl-N-(2-hydroxyethyl)amides...
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Transparent nanocomposite coatings based on epoxy and layered double hydroxide: Nonisothermal cure kinetics and viscoelastic behavior assessments
PublikacjaLayered double hydroxide (LDH) has a particular place in clay family because of its flame retardant action. The nanoplatelet-like structure of LDH makes possible development of polymer composites with cationic or anionic nature structures in which macromolecules are positioned in between nanoplatelet galleries. In this work, neat epoxy and its transparent nanocomposite coatings with sodium dodecylbenzene sulfonate (SDBS)-modified...
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Badanie emisji akustycznej kondensatorów foliowych przy napięciowym pobudzeniu impulsowym
PublikacjaOpisano metodę oceny jakości foliowych kondensatorów przeciwzakłóceniowych za pomocą badania ich drgań w zakresie ultradźwięków pod wpływem impulsowego sygnału pobudzającego. Indukowane drgania są źródłem informacji o jakości zastosowanej w kondensatorze zwijki folii oraz wykonanych kontaktach. Przedstawiono układ impulsowej polaryzacji kondensatora oraz system do pomiaru sygnału ultradźwiękowego. Uzyskane wyniki pomiarów dla grupy...
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Ocena szkodliwości drgań przekazywanych przez grunt na konstrukcję budynku mieszkalnego przy ul. Witosa 10 w m. Damnica oraz osób w nim przebywających w wyniku pracy maszyn pobliskiego tartaku
PublikacjaTartak Damnica jest jednym z zakładów produkcyjnych firmy Poltarex Sp. z o.o. Na terenie tartaku produkowane jest drewno budowlane, tarcica stolarska oraz deski do wykończeń tarasów i wnętrz. Efektem ubocznym prowadzonych prac (praca maszyn produkcyjnych) są drgania wzbudzone gruntu, które propagują na sąsiadujące budynki mieszkalne. Opracowanie zawiera rezultaty pomiaru i analizy drgań wzbudzonych budynku mieszkalnego położonego...
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Poly-L-Lysine-modified boron-doped diamond electrodes for the amperometric detection of nucleic acid bases
PublikacjaBoron-doped diamond (BDD) is a very promising supporting material used in the construction of biosensors for molecular recognition. The direct immobilization of structurally-organized huge molecules, such as poly-L-Lysine (PLL) provides the possibility of determining organic molecules, e.g. nucleic acid bases (e.g. adenine, guanine) or peptides and proteins. This paper describes the direct method for chemical and electrochemical...
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Influence of composition of raw wastewater on removal of nitrogen compounds in multistage treatment wetlands
PublikacjaInfluence of composition of raw wastewater on the efficiency of organic matter and nitrogen removal in multistage treatment wetlands has been examined. Commonly used indicators, like COD/BOD5 and BOD5/TN ratio, determining wastewater susceptibility to biodegradation in conventional treatment technologies were assessed. It was confirmed that multistage treatment wetland may be used for treatment of wastewater with high loads of...
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007857351]
Dane BadawczeThis is the histopathological image of HEART, MEDIASTINUM, AND PLEURA tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007859301]
Dane BadawczeThis is the histopathological image of BRAIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007853541]
Dane BadawczeThis is the histopathological image of HEART, MEDIASTINUM, AND PLEURA tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007858461]
Dane BadawczeThis is the histopathological image of BRAIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007851751]
Dane BadawczeThis is the histopathological image of HEART, MEDIASTINUM, AND PLEURA tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Classification of submandibular salivary stones based on ultrastructural studies
PublikacjaIntroduction: Sialolithiasis remains a clinical problem with unclear etiopathogenesis, lack of prevention methods, and only surgical treatment. Materials and methods: An ultrastructure examination of submandibular sialoliths obtained from patients with chronic sialolithiasis was conducted using a scanning electron microscope and X-ray photoelectron...
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Controlling the size and morphology of precipitated calcite particles by the selection of solvent composition
PublikacjaCalcium carbonate particles were obtained in the reaction of calcium hydroxide with carbon dioxide at 65°C. Initial Ca(OH)2 suspensions were prepared in pure water and aqueous solutions of ethylene glycol or glycerol of the concentration range up to 20% (vol.). The course of reaction was monitored by conductivity measurements. Precipitated solids were analyzed by FTIR, XRD, SEM and the particles size distribution was determined...
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Obrabiarki i narzędzia, W/L, ZiIP, I stop., 5 sem., zima 2023/24,(PG_00055240)
Kursy Online -
Iron(III)-selective materials based on a catechol-bearing amide for optical sensing
PublikacjaThe synthesis and ion-binding properties of a new amide L derived from 3,4-dihydroxybenzoic acid are described. Due to the presence of a catechol unit, the compound interacts selectively with iron(III) in organic solvent (dimethyl sulfoxide, DMSO) to produce a color change from pale yellow to green. The incorporation of the ligand L into polymeric matrices or its encapsulation into surfactant-based spheres enables analyte detection...
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Distribution of volatile organohalogen compounds in petrochemical plant water streams
PublikacjaThe study assesses halogenated volatile organic compound concentrations in the water and wastewaterstreams of a petrochemical plant. Water samples were collected at 11 sampling points during 5 samplingcampaigns. The samples were collected from the oil dewaxing unit and in the wastewater treatmentplant. Dichloromethane and 1,2-dichloroethane were the most frequently determined compounds. Tetrachloroethenewas also detected at the...
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Determination of selected chemical parameters in surface water samples collected from the Revelva catchment (Hornsund fjord, Svalbard)
PublikacjaSurface water samples (river and lake) were collected from the Revelva catchment every summer from 2010 to 2013. This study concerns importance of the use of some analytical techniques for pollutants and parameters deter- mination in Arctic environmental samples based on the example of total organic carbon, phenols, and formaldehyde determination and measurement of pH and electrical conductivity parameters. Significant...
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Selected concentration techniques for gas chromatographic analysis of environmental samples
PublikacjaThe paper describes the role and tasks of environmental analysis and monitoring. It emphasises the leading role played by gas chromatography, especially when coupled with suitable sample preparation. This is demonstrated by some literature evidence and mainly by the author's original work on the design of sample preparation apparatus and development of GC-based methods of determination of a wide variety of organic pollutants in...
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Modelowanie testów dynamicznych skokiem z progu wykonanych na moście wantowym w ciągu ulicy Sucharskiego w Gdańsku.
PublikacjaPrzedstawiono numeryczne symulacje testu dynamicznego przeprowadzonego na podwieszonym moście w ciągu Trasy Sucharskiego w Gdańsku. Drgania mostu wywołane były skokiem przedniej osi samochodu TATRA z progu o wysokości 7 cm. Samochód modelowano jako układ o dwóch stopniach swobody dla którego parametry określono na podstawie pomiarów dwoma akcelerometrami umiejscowionymi na przedniej masce i osi samochodu. przestrzenny model...
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [623073000785881]
Dane BadawczeThis is the histopathological image of BRAIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007859901]
Dane BadawczeThis is the histopathological image of BRAIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007854311]
Dane BadawczeThis is the histopathological image of BRAIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007858491]
Dane BadawczeThis is the histopathological image of BRAIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007853251]
Dane BadawczeThis is the histopathological image of BRAIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007859561]
Dane BadawczeThis is the histopathological image of BRAIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007852301]
Dane BadawczeThis is the histopathological image of BRAIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Disorders related to short gestation and low birth weight, not elsewhere classified - Male, 0 - Tissue image [6230730007857761]
Dane BadawczeThis is the histopathological image of BRAIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: VS200 Olympus slide scanner (20x magnification) and saved to DICOM format.
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Poszukiwanie minimalnej liczby parametrów niezbędnych do realizacji punktu utopii zadania jednakowej prędkości zanikania drgań
PublikacjaW pracy opisano zagadnienie lokalnej jednoznaczności dla zadania poszukiwania realizowalnego punktu utopii zadania polioptymalizacji. Problem zobrazowano zadaniem poszukiwania optymalnej lokalizacji elementów tłumiących drgania. Rozważane są drgania swobodne ciała płaskiego. Masa ciała jest wariantowo zmienna. Rozważane są dwa warianty masy. Pierwszy wariant odpowiada pustej skrzyni ładunkowej, drugi odpowiada masie skrzyni wraz...
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New algorithms for wow and flutter detection and compensation in audio
PublikacjaW referacie przedstawiono nowe metody dyskryminacji naturalnych efektów muzycznych i pasożytniczych zniekształceń drżenia dźwięku. Dodatkowo, opisano w nim metody wyznaczania przebiegu zniekształceń drżenia. Wśród nich znajdują się: detekcja okresowości sygnału w poszczególnych ramkach czasowych, śledzenie zmian przydźwięku sieciowego wykorzystujące modelowane AR widma sygnału, śledzenie zmian wysokoczęstotliwościowego prądu podkładu....
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New algorithms for wow and flutter detection and compensation in audio
PublikacjaW referacie przedstawiono nowe metody dyskryminacji naturalnych efektów muzycznych i pasożytniczych zniekształceń drżenia dźwięku. Dodatkowo, opisano w nim metody wyznaczania przebiegu zniekształceń drżenia. Wśród nich znajdują się: detekcja okresowości sygnału w poszczególnych ramkach czasowych, śledzenie zmian przydźwięku sieciowego wykorzystujące modelowane AR widma sygnału, śledzenie zmian wysokoczęstotliwościowego prądu podkładu....
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Tunable Dielectric Switching of (Quinuclidinium)[MnCl4] Hybrid Compounds
PublikacjaInorganic−organic hybrid QMnCl (Q = quinuclidinium) crystals were synthesized and characterized. The X-ray and variable-temperature IR/Raman analysis demonstrate that the crystals undergo a reversible structural phase transition, which originates from an order−disorder process and is related to the dynamics of the organic Q cation. Dielectric function measurements disclose a switchability between low (“OFF”) and high (“ON”) dielectric...
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Hydrophobic and hydrophilic properties of pollutants as a factor influencing their redistribution during snowpack melt
PublikacjaGlaciers accumulate organic pollutants delivered by snow. However, our understanding of the exact dynamics of organic pollutants in the snowpack relies primarily on laboratory experiments and mathematical models. To fill the gap related to the detailed field data, we have conducted observations of melting snow profiles in two locations and three different stages of melting on one High Arctic glacier, as well as in superimposed...
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How green are ionic liquids? – A multicriteria decision analysis approach
PublikacjaDue to various desirable physicochemical properties, ionic liquids (ILs) are still gaining in popularity. ILs have been recurrently considered green solvents. However, environmental, health and safety assessments of ILs have raised certain doubts about their benignness, and their greenness status is currently unclear. To clarify the situation on their greenness, we perform a comprehensive assessment of more than 300 commercially...
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Chemical Composition of Atmospheric Air in Nemoral Scots Pine Forests and Submountainous Beech Forests: The Potential Region for the Introduction of Forest Therapy
PublikacjaStudies show that forests are one of the main recreational destinations. This can be explained by their beneficial effects on the health of their visitors, which can be attributed to compounds from the terpene group. The aim of this research was to determine the chemical composition of air in the interiors of Nemoral Scots pine forests and submountainous beech forests, with the determination of compounds of the terpene group. Samples...
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Statistical evaluation of physical and index properties of Vistula Marshlands deltaic soft soils
PublikacjaThis paper provides statistical evaluation of physical and index parameters of the Vistula Marshlands deltaic soft soils using three datasets. Soft soils from the Vistula Marshlands are grouped into the four categories: (1) silty/sandy loams, (2) organic clays, (3) organic silts and (4) peats. Variability of basic and derivative physical properties as well as Atterberg's limits and plasticity index is studied. It is found that...
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Długi opad nawalny
PublikacjaOmówienie opadu krytycznego w lipcu 2016 r. Problem nieprzewidywalności oraz wyjątkowo długiego trwania opadu. Nieuniknione konsekwencje. Czy można było im zapobiec?
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Efektywność działania smarownic a redukcja hałasu generowanego na łukach linii tramwajowych
PublikacjaIntensywne procesy urbanizacyjne oraz rozwój gospodarczy są przyczyną zwiększenia wrażliwości człowieka na otaczające go w miastach niedogodności - hałas, drgania i zanieczyszczenie powietrza. Jednocześnie podejmowane sa działania mające na celu ograniczenie wpływu zjawisk obniżających standard życia. W zakresie komunikacji tramwajowej następuje wymiana taboru i modernizacja linii. Poprawa stanu infrastruktury tramwajowej powinna...
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A novel method for vibration surveillance during high speed ball end milling of flexible details
PublikacjaPraca dotyczy nadzorowania drgań układów niestacjonarnych modelowanych metodą elementów skończonych. Obróbka frezem kulistym przedmiotów podatnych jest często stosowana w przypadku nowoczesnych centrów obróbkowych. Drgania względne narzędzie-przedmiot obrabiany mogą doprowadzić do utraty stabilności i powstania drgań samowzbudnych typu chatter. W pracy proponuje się metodę minimalizacji poziomu drgań poprzez dopasowanie prędkości...
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Układy zasilania energią resztkową z urządzeń grzewczych
PublikacjaPozyskiwanie energii resztkowej z różnorodnych źródeł ma za zadanie odzyskanie energii z nietypowych źródeł takich jak np.: drgania, ruch mas powietrza, efekt termiczny. Energia pozyskiwana z tych niekonwencjonalnych źródeł jest obecnie wykorzystywana do zasilania sieci sensorowych, czy mikrokontrolerów o niskich poborach mocy. Stosowanie technologii pozyskiwania energii resztkowej pozwala wyeliminować konieczność doprowadzania...
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A probabilistic description of footbridges vibration serviceability
PublikacjaRozważa się użytkowalność kładki dla pieszych ze względu na ich drgania. Imperfekcje ruchu pieszych są opisane zmianami kluczowych współczynników. Częstotliwość ruchu, długość kroku oraz amplituda siły modelującej pieszego są opisywane rozkładami prawdopodobieństwa. Stosuje się metodę Monte Carlo. Dane z symulacji probabilistycznych używa się do obliczeń numerycznych. Aby zredukować liczbę realizacji, przeprowadza się analizę zbieżności...
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A probabilistic description of footbridges vibration serviceability
PublikacjaRozważa się użytkowalność kładki dla pieszych ze względu na ich drgania. Imperfekcje ruchu pieszych są opisane zmianami współczynników tegoż ruchu. Bierze się pod uwagę rozkłady prawdopodobieństwa częstotliwości ruchu, długości kroku oraz amplitudy siły modelującej pieszego. Imperfekcje te znacznie wpływają na zachowanie konstrukcji. Stosuje się metodę Monte Carlo. Dane z symulacji probabilistycznych używa się do obliczeń numerycznych....