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Wyniki wyszukiwania dla: unsteady surface flow
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Surface EMG-based signal acquisition for decoding hand movements
Dane BadawczeBiosignal processing plays a crucial role in modern hand prosthetics. The challenge is to restore functionality of a lost limb based on the signals acquired from the surface of the stump. The number of sensors (emg channels) used for signal acquisition influence the quality of a prosthetic hand. Modern algorithms (including neural networks) can significantly...
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Visualization of the surface of the Nafion membrane
Dane BadawczeFuel cells use the chemical energy of hydrogen or other fuels to produce electricity. If the fuel is hydrogen, the only products are electricity, water and heat. Fuel cells are unique in the variety of their potential applications, they can use a wide variety of fuels. They are also highly scalable devices that can power both cars and mobile phones....
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The influence of sterilization with EnbioJet Microwave Flow Pasteurizer on composition and bioactivity of aronia and blue-berried honeysuckle juices
PublikacjaIn this study, fruit juices that are rich sources of anthocyanins, obtained from aronia (Am. chokeberry, Aronia melanocarpa) and blueberry honeysuckle (Lonicera caerulea L. var. edulis) were used to examine the preservation of plant phytochemicals and bioactivity upon sterilization -either thermal, or with an EnbioJet microwave flow pasteurizer. The chemical properties verified included determinations of anthocyanins and other...
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FPGA-Based Implementation of Real Time Optical Flow Algorithm and Its Applications for Digital Image Stabilization
PublikacjaAn efficient simplification procedure of the optical flow (OF) algorithm as well as its hardware implementation using the field programmable gate array (FPGA) technology is presented. The modified algorithm is based on block matching of subsets of successive frames, and exploits one-dimensional representation of subsets as well as the adaptive adjustments of their sizes. Also, an l1-norm-based correlation function requiring no...
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The electrochemical studies of CB-PLA electrode after surface activation by proteinase K digestion with different times and concentrations
Dane BadawczeThe dataset contains the electrochemical studies performed to evaluate surface activation of the CB-PLA 3D printed electrodes by enzymatic hydrolysis in a solution containing proteinase K. DIfferent proteinase K concentrations and digestion times were evaluated, as described in subfolder names. The studies were performed before surface activation, during...
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Influence of dissolved organic nitrogen on surface waters
PublikacjaThe aim of this study was to determine the susceptibility of dissolved organic nitrogen (DON) contained in biologically treated wastewater disposed from municipal wastewater treatment plants (WWTPs) to biodegradability and bioavailability in a water environment. Additionally an evaluation was performed of the participation of this organic nitrogen fraction, including bioavailable DON (bDON), in the nitrogen balance for the Baltic...
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Innovative Solutions in Surface Water Quality Monitoring
PublikacjaIn 2010 a project entitled "Integrated Support System for Management and Protection of Water Dam Reservoir (ZiZOZap)” was initiated, to aid solving water management problems on a river and dam reservoir formed on it. An innovative system of continuous monitoring was created, that encompassed selected physical and chemical parameters of river and lake waters in three chosen sites. This article presents a selection of results, that...
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Mesoscopic impedance analysis of solid materials’ surface
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Concept of Neural Model of the Sea Bottom Surface
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The Laser Surface Remelting of Austenitic Stainless Steel
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The evaluation of the surface quality after laser cutting
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Mechanism for sonocoating a polymer surface with nano-hydroxyapatite
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The Effect of Dimple Distortions on Surface Topography Analysis
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Reduction of the end-effect in surface texture analysis
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Detection of measurement noise in surface topography analysis
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Problems of surface topography with oil pockets analysis
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Effect of surface modification on starch biopolymer wettability
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Effect of surface modification on starch/phospholipid wettability
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Evolution of the surface species of the V2O5–WO3 catalysts
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Total mercury in surface sediments of the Gdansk Basin
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New procedure of silica gel surface modification
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Surface vaviness of components machined by burnishing method
PublikacjaPowierzchnię po obróbce wykończeniowej definiuje się zazwyczaj za pomocą parametrów chropowatości. Rosnące wymagania jakościowe w stosunku do wytwarzanych części maszyn powodują rozszerzanie się zakresu parametrów opisujących powierzchnię. W artykule przedstawiono ocenę jakościową powierzchni nagniatanych za pomocą parametrów falistości.
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Mesoscopic impedance analysis of solid materials surface
PublikacjaSeveral techniques have been developed in order to characterize electrical properties of surfaces in micrometer/nanometer scale. Obtaining of the spatial distribution of sample resistance, capacitance or potential requires separate measurements performed in different scanning modes. On the other hand, analysis of the frequency response of investigated system enables determination of several physical quantities in single measurement...
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Shaping of the workpiece surface in single-disc lapping
PublikacjaShape errors of the tool exert a dominant influence on the shape accuracy of the workpiece. The correlation between flatness errors of the lap and flatness errors of the workpieces was checked experimentally and determined analytically. Computer model of the workpiece shaping by lapping was developed. Evaluation method of the workpiece orientation as well as some simulation results for a lap with shape errors of convexity and cincavity...
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Hydrothermal Surface Treatment of Biodegradable Mg-Materials
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Surface studies of twinned of YBa2Cu3O7−δ crystals
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Surface contamination after lapping by abrasive material
PublikacjaPrzedstawiono wyniki badań skażenia powierzchni żeliwa sferoidalnego mikroziarnami węglika krzemu po docieraniu. Określowo wpływ współczynnika upakowania mikroziaren w strefie docierania na intensywność skażenia powierzchni ścierniwem. W badaniach wykorzystano powierzchniową mikroanalizę rentgenowską.
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Some aspects surface cooling by impinging jet
PublikacjaW pracy przedstawiono wyniki badań wymiany ciepła, uskoku hydraulicznego i stabilności podczas napływu strugi na powierzchnię ciała stałego.
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Shaping of the workpiece surface in single-disc lapping
PublikacjaPrzedstawiono korelację pomiędzy błędami kształtu docieraka i błędami kształtu przedmiotów obrabianych. Wyniki analityczne zostały sprawdzone doświadczalnie, co pozwoliło zbudować komputerowy model kształtowania powierzchni docieranych. Przedstawiono sposób wyznaczania intensywności kontaktu między przedmiotem docieranym, a docierakiem. Opracowano metodę wyznaczania położenia przedmiotu na docieraku.
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Probabilistic analysis of slope with planar slip surface
PublikacjaPraca dotyczy probabilistycznej oceny stateczności zboczy. Omówiono sposób określania prawdopodobieństwa utraty stateczności przy wykorzystaniu metody momentów (ang. FOSM). Podejście takie zastosowano do analizy zsuwu konsekwentnego jednorodnego zbocza. Rozpatrzono wpływ zmienności statystycznej parametrów wytrzymałościowych na końcowe wyniki.
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Comparison of volume-and surface-detention-time distributions
PublikacjaCzas zatrzymania ścieków w reaktorze jest bardzo ważnym parametrem projektowym. Jego wyznaczenie jest trudne i kłopotliwe. Z tego względu zbadano możliwość zastąpienia wartości tego parametru, wyznaczonej tylko dla swobodnej powierzchni ścieków. W wyniku stwierdzono dopuszczalność takiej zamiany.
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Formation of wood surface roughness in burnishing process
PublikacjaW publikacji przedstawiono i omówiono rozwój bezwiórowych metod obróbki wykańczającej drewna przez nagniatanie. Przedstawiono wpływ nagniatania na chropowatość powierzchni drewna. Badania przeprowadzono na próbkach toczonych i nagniatanych. Wyniki odniesiono do głównych parametrów nagniatania jak: siła nagniatania oraz promień zaokrąglenia elementu nagniatającego.
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Problems of flat surface lapping : chapter 16
PublikacjaPrzedstawiono problemy docierania powierzchni płaskich w układach jednotarczowych. Omówiono analityczne i numeryczne modele kinematyki docierarek konwencjonalnych i niestandardowych, obróbkę docierakami aktywizowanymi w sposób swobodny i wymuszony, jednolitymi i dwumetalowymi. Zaprezentowano wyniki obróbki narzędziami ścierno-metalowymi elementów ceramicznych.
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Assessment of copper surface coverage with corrosion inhibitor using AFM-based local electrical measurements
PublikacjaThe paper presents a new method of assessment of metal surface coverage with corrosion inhibitor and thus of inhibitor protective performance. It is based on the atomic force microscopy measurement performed in a contact mode. Apart from topography images the proposed approach allows acquisition of local DC maps and local electrical impedance spectra via application of DC bias voltage or AC perturbation signal between the conductive...
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Dynamic Electrochemical Impedance Spectroscopy (DEIS) as a Tool for Analyzing Surface Oxidation Processes on Boron-Doped Diamond Electrodes
PublikacjaSurface oxidation processes play a key role in understanding electrochemical properties of boron-doped diamond (BDD) electrodes. The type of surface termination groups, which create the potential window of electrolytic water stability or hydrophobicity, influences such properties. In this study the kinetics of oxidation process under anodic polarization were studied in situ by means of Dynamic Electrochemical Impedance Spectroscopy...
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Fracture Surface Behavior of 34CrNiMo6 High-Strength Steel Bars with Blind Holes under Bending-Torsion Fatigue
PublikacjaThe present study evaluates the fracture surface response of fatigued 34CrNiMo6 steel bars with transverse blind holes subjected to bending with torsion loading. The analysis of the geometric product specification was performed by means of height parameters Sx, functional volume parameters Vx, and fractal dimension Df. Surface topography measurements were carried out using an optical profilometer with focus variation technology....
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CFD analysis of a flow in commutation window in PWK pump
Dane BadawczeThe included data is a result of CFD analysis of a flow in a commutation window in PWK pump. The results were obtained for different pressures, viscosities and geometrical parameters of the gap. All the rows and columns have descriptions similar as in PhD Thesis: "Kompensacja skoków ciśnienia w pompie tłoczkowej o zmiennej wydajności z rozrządem krzywkowym",...
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Visible light photocatalysis employing TiO2/SrTiO3-BiOI composites: Surface properties and photoexcitation mechanism
PublikacjaA series of binary TiO2/SrTiO3 and ternary TiO2/SrTiO3_BiOI composites have been synthesized using multistep preparation method. Characterization of the obtained photocatalysts covered complex analysis including morphology + y (SEM), BET specific surface area, porosity, optical properties (DRS), chemical composition of surface (XPS), crystal structure and crystal size (XRD). UV–vis and Vis ligh induced photocatalytic activity was...
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A brief note on entire fracture surface topography parameters for 18Ni300 maraging steel produced by LB-PBF after LCF
PublikacjaThe concept of entire fracture surface investigation is helpful in explaining fatigue phenomena. In this paper, this method has been applied for 18Ni300 maraging steel using a 3D measurement system. Before post-mortem analysis, the specimens produced by laser beam powder bed fusion (LB-PBF) were tested under low-cycle fatigue (LCF) for eight strain amplitudes in the interval 0.3% to 1.0%. The attention was placed on the relationship...
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Transport of dangerous goods by rail, and threats to the subsoil of the railway surface in the event of a disaster
PublikacjaIn Poland, in 2020, the mass of dangerous goods (loads) transported by rail was 26 151.06 thousand tone. This translated into the performance of 8 899 691.89 thousand tone - km of transport performance. In 2020, these figures accounted for 11.72% of the weight of goods transported by rail. The situation is similar in other countries around the world. With such a large volume of transport of dangerous...
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Point cloud based surface analysis of prestressed concrete element in exceeded state of serviceability
PublikacjaBy definition, serviceability state is characterized by the fact that despite meeting the requirements associated with carrying capacity, the object is not suitable for use. Serviceability limit state refers to factors, such as durability, overall stability, fire resistance, cracking, excessive vibration. Perfect examples of exceeded serviceability state are the improper vibration of a skyscraper, which inhabitants may suffer from...
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Electrochemical degradation of textile dyes in a flow reactor: effect of operating conditions and dyes chemical structure
PublikacjaIn this study, electrochemical oxidation of five azo dyestuffs (Yellow D-5GN, Red D-B8, Ruby F-2B, Blue D-5RN, Black DN), that are widely used in the textile industry, was investigated in a flow reactor. BDD electrode with a high boron doping level (C/B = 10 000) was prepared and used. Two configurations of reactor were considered, i.e., one with the undivided cell, and the other with the cell divided by anodic and cathodic compartments....
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Improved finite element method for flow, heat and solute transport of Prandtl liquid via heated plate
PublikacjaIn the current study, a vertical, 3D-heated plate is used to replicate the generation of heat energy and concentration into Prandtl liquid. We discuss how Dufour and Soret theories relate to the equations for concentration and energy. In order to see how efectively particles, interact with heat and a solvent, hybrid nanoparticles are used. It does away with the phenomena of viscous dissipation and changing magnetic felds. The motivation...
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Effects of Surface Pretreatment of Titanium Substrates on Properties of Electrophoretically Deposited Biopolymer Chitosan/Eudragit E 100 Coatings
PublikacjaThe preparation of the metal surface before coating application is fundamental in determining the properties of the coatings, particularly the roughness, adhesion, and corrosion resistance. In this work, chitosan/Eudragit E 100 (chit/EE100) were fabricated by electrophoretic deposition (EPD) and both their microstructure and properties were investigated. The present research is aimed at characterizing the effects of the surface...
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Vident-synth: a synthetic intra-oral video dataset for optical flow estimation
Dane BadawczeWe introduce Vident-synth, a large dataset of synthetic dental videos with corresponding ground truth forward and backward optical flows and occlusion masks. It can be used for:
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Example of Using Particle Swarm Optimization Algorithm with Nelder–Mead Method for Flow Improvement in Axial Last Stage of Gas–Steam Turbine
PublikacjaThis article focuses principally on the comparison baseline and the optimized flow efficiency of the final stage of an axial turbine operating on a gas–steam mixture by applying a hybrid Nelder– Mead and the particle swarm optimization method. Optimization algorithms are combined with CFD calculations to determine the flowpaths and thermodynamic parameters. The working fluid in this study is a mixture of steam and gas produced...
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Drop-coating deposition surface-enhanced Raman spectroscopy on silver substrates for biofluid analysis
PublikacjaUtilization of surface-enhanced Raman spectroscopy as a measurement technique is of particular interest in biodetection due to its superb chemical specificity and high sensitivity. The use of SERS substrates further improve this method by massive enhancement of the molecule Raman spectrum, permitting very low levels of detection. Therefore it is important to seek for new ways to develop reliable substrates, which are quickly and...
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BET (Brunauer-Emmett-Teller) surface area analysis of titanium dioxide coated nickel foams
Dane BadawczeThe data are presented for the BET surface results of nickel foams coated with titanium dioxide and heated 400, 500 and 600 degrees Celsius in an argon atmosphere. N2 sorption was performed at 77 K pore size distribution was determined by BJH and DFT methods.
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Surface and Corrosion Properties of AA6063-T5 Aluminium Alloy in Molybdate-containing Sodium Chloride Solutions
PublikacjaCorrosion properties of aluminium alloy AA6063-T5 were investigated in molybdate-containing NaCl solutions. Electrochemical, microscopic, and spectroscopic experiments were utilized to examine the mechanism of corrosion inhibition by molybdates. SEM-EDX, magnetic force, and intermodulation electrostatic force microscopy data suggested that the inhibition initiation preferentially occurred over Fe-rich cathodic IMPs. Spectroscopic...
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Study on surface termination of boron-doped diamond electrodes under anodic polarization in H2SO4 by means of dynamic impedance technique
PublikacjaAnodic oxidation is a popular way to modify termination bonds at boron doped diamond electrodes altering their electrochemical and physicochemical properties. Our studies, performed with dynamic electrochemical impedance spectroscopy technique, supported with X-ray photoelectron spectroscopy and ellipsometry analysis prove its utility in continuous on-line monitoring of impedance changes on the electrode surface under polarization...