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Search results for: CHONDROITIN SULFATE
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Cylindrical surface irregularities presented by frequency spectra of relative tool displacement to the workpiece
PublicationW pracy przedstawiono częstotliwościowe składowe nierówności powierzchni toczonych. Ponieważ nierówności mają charakter szerokopasmowy, trudny do wartościowania parametrami normatywnymi, zastosowano ich analizę amplitudowo-częstotliwościową, opartą na szybkiej transformacie Fouriera. Zaproponowano oryginalny układ pomiaru sygnału przemieszczeń narzędzia względem przedmiotu dla charakteryzowania nierówności wzdłużnych. Dla generowania...
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Cylindrical surface irregularities presented by frequency spectra of relative tool displacement to the workpiece
PublicationW pracy przedstawiono częstotliwościowe składowe nierówności powierzchni toczonych. Ponieważ nierówności mają charakter szerokopasmowy, trudny do wartościowania parametrami normatywnymi, zastosowano ich analizę amplitudowo-częstotliwościową, opartą na szybkiej transformacie Fouriera. Zaproponowano oryginalny układ pomiaru sygnału przemieszczeń narzędzia względem przedmiotu dla charakteryzowania nierówności wzdłużnych. Dla generowania...
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Influence of Laser Treatment on Microstructure of Surface Layer of the Ti-6Al-4V Alloy
PublicationPrzedstawiono mikrostrukturę powierzchni, przekroju i przełomu warstwy wierzchniej stopu Ti-6Al-4V uzyskanej po nadtapianiu laserem w różnym środowisku. Stwierdzono wzrost mikrotwardości stopu w warstwie nadtopionej, rozdrobnienie ziarna, a także tworzenie azotków tytanu i mikropęknięć skutkiem obecności znacznych naprężeń własnych. Grubość wytworzonych warstw osiągała wartość 1,5 mm.
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EXPERIMENTAL STUDY OF SURFACE ROUGHNESS EFFECT ONTHE RHEOLOGICAL BEHAVIOR OF MR FLUID
PublicationPaper presents the results of shear stress measurements of a commercial magnetorheological fluid using a plate-plate type geometry with a modified working surface. The purpose of the study was to determine the effect of changing the roughness of the measuring plate on the obtained shear stress results. Controlled shear rate tests and Magneto Sweep measurements were carried out for three MR fluid layer heights. The tests were...
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Spectroscopic and Spectroelectrochemical Studies on Redox Properties of Zinc Sulfide and Their Consequences on Photocatalytic Activity
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The Erosion Resistance and Microstructure Evaluation of Laser Surface Alloyed Sintered Stainless Steels
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Surface properties of wustite based iron-cobalt catalysts for ammonia synthesis reaction
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The effect of manganese on the structural and surface properties of nanocrystalline cobalt catalyst for ammonia synthesis
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Experimental analysis on the risk of vortex ventilation and the free surface ventilation of marine propellers
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Lake surface changes of the Osa River catchment, (northern Poland), 1900–2010
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Organic Pollution in Surface Waters from the Fuglebekken Basin in Svalbard, Norwegian Arctic
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The phase composition of the surface layer of laser melted Ti-6Al-4V bioalloy
PublicationZastosowanie metody obróbki laserowej stopów Ti zwiekszyły twardość i odporność stopu na korozję. Jednakże uzyskane warstwy były stosunkowo cieńkie. W pracy zastosowano laser o dużej mocy dla stopu schłodzonego w ciekłym azocie, aby uzyskać grubszą warstwę, która w strefie zewnętrznej złożona będzie z tlenku i azotku tytanu, ważnych faz w biostopach.
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Surface texture formation in precision machining of direct laser deposited tungsten carbide
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The effect of random surface topography height on fretting in dry gross slip conditions
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Surface texture generation during cylindrical milling in the aspect of cutting force variations
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Cogging torque analysis based on energy approach in surface-mounted PM machines
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Precision surface characterization for finish cylindrical milling with dynamic tool displacements model
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Surface quality and topographic inspection of variable compliance part after precise turning
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Surface roughness analysis after machining of direct laser deposited tungsten carbide
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Influence of Laser Modification on the Surface Character of Biomaterials: Titanium and Its Alloys—A Review
PublicationLaser surface modification is a widely available and simple technique that can be applied to different types of materials. It has been shown that by using a laser heat source, reproducible surfaces can be obtained, which is particularly important when developing materials for medical applications. The laser modification of titanium and its alloys is advantageous due to the possibility of controlling selected parameters and properties...
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Tuning of the Titanium Oxide Surface to Control Magnetic Properties of Thin Iron Films
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Surface Characteristics of Plasma Treated and Titanium Nitride (TiN) Deposited Aluminum Alloy
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Surface Property Modification of Collagen, Hyaluronic Acid, and Chitosan Films with the Neodymium Laser
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Assessment of metal removal in a surface flow constructed wetland treating landfill leachate
PublicationThe study concerns heavy metal retention and transformation processes in a free water surface constructed wetland treating landfill leachate in a temperate climate. The total effectiveness of heavy metals removal in the analyzed CW was evaluated basing on heavy metals inflow and outflow concentrations. The concentrations of eight heavy metals (Fe, Mn, Zn, Pb, Ni, Cu, Cr, Cd) in landfill leachate (LL) and sediments were measured....
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Properties of surface layers of titanium alloy Ti6Al4V after laser melting processes
PublicationThe article presents the investigation results of titanium alloy Ti6Al4V surface layer after laser melting process. The process of laser melting was performed using Nd-YAG laser. The evaluation of structure of the alloy as well as hardness and chemical composition was performed. It was shown that laser melting changes the structure and properties of titanium alloy Ti6Al4V and process parameters as scanning speed affects the thickness...
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About nutrient liquid flow between potential flow and cartilage surface in bioreactor
PublicationW niniejszej pracy wyznaczony został przepływ cieczy odżywczej o właściwościach nienewtonowskich w cienkiej warstwie granicznej w pobliżu powierzchni komórek chrząstki (chondrocytu) podczas hodowli w bioreaktorze. Ruch cieczy w warstwie granicznej jest wywołany wydatkiem przepływu dostarczanej cieczy do bioreaktora. Ponadto prędkość przepływu cieczy w warstwie granicznej wokół hodowanych komórek chrząstki stawowej jest uzależniona...
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The role of atmospheric precipitation in introducing contaminants to the surface waters of the Fuglebekken catchment, Spitsbergen.
PublicationAlthough the Svalbard Archipelago is located at a high latitude, far from potential contaminant sources, it is not free from anthropogenic impact. Towards the Fuglebekken catchment, in the southern part of Spitsbergen, north of Hornsund fjord, contaminants can be transported from mainland pollution sources. In the precipitation and surface water collected in the catchment, the following elements were detected and quantified: Ag,...
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APPLICATION OF SATELLITE IMAGERY AND GIS TOOLS FOR LAND SURFACE TEMPERATURE ESTIMATION AND VERIFICATION
PublicationLand surface temperature (LST) plays an important role in many land-surface processes on regional as well on global scales. It is also a good indicator of energy flux phenomena and is used as a parameter in various Earth observation related studies. However, LST estimation based on processing and utilisation of satellite derived data constitutes several problems in terms of time limitations, accessibility, atmospheric influence...
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Phosphate tricyclic coumarin analogs as steroid sulfatase inhibitors: synthesis and biological activity.
PublicationIn the present work, we report convenient methods for the synthesis and biological evaluation of phosphate tricyclic coumarin derivatives as potential steroid sulfatase inhibitors. The described synthesis includes the straightforward preparation of 7-hydroxy-2,3-dihydro-1H-cyclopenta[c]chromen-4-one, 3-hydroxy-7,8,9,10-tetrahydro-6H-benzo[c]chromen-6-one and 3-hydroxy-8,9,10,11-tetrahydro-7H-cyclohepta[c]chromen-6-one modified...
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Geometry optimization of steroid sulfatase inhibitors - the influence on the free binding energy with STS
PublicationIn the paper we review the application of two techniques (molecular mechanics and quantum mechanics) to study the influence of geometry optimization of the steroid sulfatase inhibitors on the values of descriptors coded their chemical structure and their free binding energy with the STS protein. We selected 22 STS-inhibitors and compared their structures optimized with MM+, PM7 and DFT B3LYP/6–31++G* approaches considering separately...
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Study of the Flow Dynamics of Surface Water Masses in the Area of the Coastal Gulf of Gdansk
PublicationThe paper describes two methods of predicting the movement of small objects with surface water masses. One of the methods uses graph theory to describe the motion of water masses in port docks. The results of this study were compared to a simulation using the hydrodynamic numerical model M3D. The results obtained in a virtual environment were related to the experiments in the real world. In the coastal area of the Gulf of Gdansk,...
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Application of 3D Whole Body Scanning in Research on Human Body Surface Area
PublicationHuman body surface area (BSA) is one of the major parameters used in several medical fields. Its heterogeneity caused by individual human characteristics sustains a many-decades-long research on the matter. Today’s technology allows to create exact body models in mere seconds. However, an extensive research that includes scanning people with major disfigurements or people suffering from diseases, which often prevent their mobility,...
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Design and Application of Magnetic Photocatalysts for Water Treatment. The Effect of Particle Charge on Surface
PublicationCore-interlayer-shell Fe3O4/SiO2/TiO2, CoFe2O4/SiO2/TiO2 and BaFe12O19/SiO2/TiO2 magnetic photocatalysts were obtained. A water-in-oil microemulsion system with suitable surfactants was used for functionalization of the magnetic core with silica interlayer and TiO2-based photocatalyst. Uncoated and coated particles were characterized by electrophoretic meaurements, X-ray diffractometry (XRD), scanning electron microscopy (SEM),...
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Binder-induced surface structure evolution effects on Li-ion battery performance
PublicationA comparative investigation on binder induced chemical and morphological evolution of Li4Ti5O12 electrodes was performed via X-ray photoemission spectroscopy, scanning electron microscopy, and electrochemical measurements. Composite electrodes were obtained using three different binders (PAA, PVdF, and CMC) with 80:10:10 ratio of active material:carbon:binder. The electrochemical performances of the electrodes, were found to be...
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Influence of yttria surface modification on high temperature corrosion of porous Ni22Cr alloy
PublicationProtective coatings for porous alloys for high temperature use are relatively new materials. Their main drawback is high temperature corrosion. In this work protective coatings based the on Y-precursor infiltrated into the sintered Ni22Cr alloys are studied at 700°C. Effects of the amount of the protective phase on the resulting corrosion properties are evaluated in air and humidified hydrogen. Weight gain of the samples, their...
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Selected anionic and cationic surface active agents: case study on the Kłodnica sediments
PublicationSurface active agents (surfactants) are a group of chemical compounds, which are used as ingredients of detergents, cleaning products, cosmetics and functional products. After use, wastes containing surfactants or their degradation products are discharged to wastewater treatment plants or directly into surface waters. Due to their specific properties of SAAs, compounds are able to migrate between different environmental compartments...
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The impact of the Tri-City Ring Road on surface water of small endorheic wetlands
PublicationThe paper presents the results of the impact of the Tri-City Ring Road on small endorheic catchment basins. Particular attention was paid to pollution discharged from the road to the surface water, as well as changes in hydrological conditions in the vicinity of the road. In the study, surface water samples were analysed in terms of their electrolytic conductivity, pH and content of major minerals. GIS was also used to study transformation...
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Synthesis and steroid sulfatase inhibitory activities of N-alkanoyl tyramine phosphates and thiophosphates
PublicationA series of phosphate and thiophosphate analogs based on the frameworks of N-alkanoyl tyramines have been synthesized and biologically evaluated. Their binding modes have been modeled using docking techniques. The inhibitory effects of the synthesized compounds were tested on STS isolated from the human placenta as well as the MCF-7, MDA-MB-231 and SkBr3 cancer cell lines. Most of the new STS inhibitors possessed potent activity...
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Vertical vibration reduction and audible sound analysis in surface grinding with electroplated tools
PublicationOne of the first approaches to the development of a grinding process monitoring system based on audible sound sensors is presented in the paper. Electroplated diamond tools (abrasive D64 and D107) were used in a modified single-disc lapping machine configuration for flat grinding of ceramics (Al2O3). The main aim of the machine modification was to reduce the vertical vibration in order to decrease the tool wear and to increase...
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Surface sediments pollution due to shipwreck s/s “Stuttgart”: a multidisciplinary approach
PublicationShipwrecks may pose a serious source of pollution for marine ecosystems. For this reason, it is of great importance to perform a marine ecosystem risk assessment due to plausible wreck presence. One of elements of such an assessment is determining the state of the environment in the vicinity of the wreck. In the work presented, the results of studies on surface sediments samples collected around the s/s Stuttgart ship sunk during...
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Are stabilizing osmolytes preferentially excluded from the protein surface? FTIR and MD studies
PublicationInteractions between osmolytes and hen egg white lysozyme in aqueous solutions were studied by means of FTIR spectroscopy and molecular dynamics. A combination of difference spectra method and chemometric analysis of spectroscopic data was used to determine the number of osmolyte molecules interacting with the protein, and the preferential interaction coefficient in presented systems. Both osmolytes – L-proline and trimethylamine-N-oxide...
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Synthesis and biological evaluation of thiophosphate tricyclic coumarin derivatives as steroid sulfatase inhibitors
PublicationSteroid sulfatase (STS) enzyme inhibition is an important approach to the management of hormone-dependent breast cancer. In this paper, we report convenient methods for the synthesis and biological evaluation of thiophosphate tricyclic coumarin analogs exhibiting STS activity. The described methods are based on the straightforward preparation of 7-hydroxy-2,3-dihydro-1H-cyclopenta[c]chromen-2-one, 3-hydroxy- 7,8,9,10-tetrahydro-6H-benzo[c]chromen-6-one,...
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TiO2 photoactivity in vis and UV light: The influence of calcination temperature and surface properties
PublicationPrzygotowano serię fotokatalizatorów w postaci tlenku tytanu (IV) kalcynowanych w różnych temperaturach od 350 do 750˚C. Charakterystyka fotokatalizatorów za pomocą metod XRD, UV-Vis/DRS, FTIR, XPS, BET oraz BJH wykazała, że próbka TiO2 aktywna w świetle widzialnym posiadała strukturę anatazu, powierzchnię właściwą ok. 200 m2/g, absorbowała światło o długości fali λ>400 nm oraz zawierała 10,1 % at. węgla (wiązanie C-C). Aktywność...
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Determination (monitoring) of PAHs in surface waters: why operationally defined procedure is needed
PublicationW pracy przedstawiono i skomentowano rezultaty badań międzylaboratoryjnych oznaczania wielopierścieniowych węglowodorów aromatycznych w wodzie czystej i wodzie zawierającej zawiesinę. Badania wskazują, ze wyniki oznaczania zależa od zastosowanej techniki izolacji analitów z próbki i końcowej procedury ich rozdzielania i oznaczania. Przeprowadzone badania wskazują, że nowoczesna analityka nie dysponuje technikami izolacji, które...
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Structure and morphology of hydrogen reduced surface of bismuth germanateand bismuth silicate glasses.
PublicationOtrzymano nanostruktury krystalicznego bizmutu w matrycy XO2(X=Si,Ge) oraz warstwę nanostruktur krystalicznego bizmutu na powierzchni redukowanych w atmosferze wodoru szkieł Bi0.33Ge0.67O1. i Bi0.57Si0.43O1.72. Zaproponowano prosty model budowy zredukowanych szkieł bizmutowo-germanowych potwierdzony wynikami badań AFM i XRD. Obserwowane zmiany przewodnictwa elektrycznego redukowanych szkieł wyjaśniono na podstawie modelu.
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Laser assisted forming of the surface layer of Al-Si alloy at cryogenic conditions.
PublicationW artykule przedstawiono wpływ powierzchniowego laserowego przetapiania w warunkach kriogenicznych na mikrostrukturę, mikrotwardość i własności korozyjne stopu AlSi13Mg1CuNi. Stwierdzono korzystny wpływ obróbki laserowej na mikrostrukturę, mikrotwardość i odporność na zużycie ścierne badanego stopu aluminium.
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Measurements and calculations of the width of the fracture process zones on the surface of notched concrete beams
PublicationArtykuł omawia wyniki pomiaru i analizy numerycznej szerokości strefy pękania w belkach betonowych z nacięciem. Do pomiarów zastosowano metodę DIC. Do symulacji zastosowano model sprężysto - plastyczny i model z degradacją sztywności. Oba modele zostały rozszerzone o nielokalne osłabienie. Wyniki symulacji porównano z doświadczeniami.
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Synthesis and biological evaluation of N-acylated tyramine sulfamates containing C-F bonds as steroid sulfatase inhibitors
PublicationSteroid sulfatase (STS) is responsible for the hydrolysis of biologically inactive sulfated steroids into their active un-sulfated forms and promotes the growth of various hormone-dependent cancers (e.g., breast cancer). Therefore, the STS enzyme is a promising therapeutic target for the treatment of steroid-sensitive cancers. Herein, we report the synthesis and biological evaluation of sulfamate analogs as potential STS inhibitors...
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Sea surface temperature retrieval from MSG/SEVIRI data in the Baltic Sea area
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Surface-Step-Induced Magnetic Anisotropy in Epitaxial LSMO Deposited on Engineered STO Surfaces
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