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The Influence of Water and Mineral Oil on Mechanical Losses in a Hydraulic Motor for Offshore and Marine Applications
PublikacjaIn this paper, mechanical losses in a hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were onducted using a special design (prototype) of a hydraulic satellite motor. The design of the satellite motor is presented. This motor was developed to supply both with water and mineral oil and features...
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Experimental comparison of the transition speed of a hydrodynamic journal bearing lubricated with oil and magnetorheological fluid
PublikacjaA journal bearing test bench is used to find the transition speed between the hydrodynamic and mixed lubrication regimes for a modified magnetorheological (MR) fluid. It is shown that the transition speed of the bearing can be reduced by applying a local magnetic field near minimum film when it is lubricated with the MR fluid, and that this will only marginally increase friction. The lubricating performance of the MR fluid is compared...
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Electrical and mechanical properties of nitrided sol-gel derived TiO2 and SiO2-TiO2 films
PublikacjaW pracy opisano właściwości elektryczne i mechaniczne cienkich warstw zawierających TiN. Warstwy tlenkowe TiO2 i TiO2-SiO2 zostały przygotowane metodą zol-żel i następnie poddane procesowi amonolizy. Przewodność elektryczna została zmierzona w zaktesie temperatur 10-900K. Warstwy o dużej zawartości TiN charakteryzują się małą energią aktywacji, poniżej 0,1eV. Badania wykazały dużą twardość próbek o wysokiej zawartości TiN.
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Viscoelastic properties of oil-in-water emulsions stabilized by acylpropyleneglycol emulsifiers obtained with sodium soaps
PublikacjaZbadano właściwości reologiczne emulsji typu O/W, stabilizowanych emulgatorami acylopropylenoglikolowymi. Do badań wykorzystano reometr o kontrolowanym naprężeniu ścinającym. Wykonano testy oscylacyjne tzw. ''dużej deformacji próbki'' oraz analizy typu ''pełzanie i powrót''. Stwierdzono, że właściwości lepkosprężyste emulsji determinowane były składem stosowanego emulgatora. Wszystkie badane układy emulsyjne charakteryzowały się...
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Advanced super-hydrophobic polymer-based porous absorbents for the treatment of oil-polluted water
PublikacjaThe threat of environmental pollution caused by spilled oil is rapidly increasing along with the expansion of oil exploration, the development of maritime activities and industrial growth. Oil spill incidents usually affect seriously the ecosystem and human life. Therefore, the treatment and recovery of the oil spill have been considered as an ultra-important issue to protect the environment and to minimize its negative impacts...
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MEASUREMENT OF TEMPERATURE-DEPENDENT VISCOSITY AND THERMAL CONDUCTIVITY OF ALUMINA AND TITANIA THERMAL OIL NANOFLUIDS
PublikacjaIn this study results of simultaneous measurements of dynamic viscosity, thermal conductivity, electrical conductivity and pH of two nanofluids, i.e. thermal oil/Al2O3 and thermal oil/TiO2 are presented. Thermal oil is selected as a base liquid because of possible application in ORC systems as an intermediate heating agent. Nanoparticles were tested at the concentration of 0.1%, 1% and 5% by weight within temperature range from...
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Fabrication and Crystal Structure of Sol-Gel Deposited BST Thin Films with Compositional Gradient
PublikacjaIn the present research technology of compositionally graded barium strontium titanate Ba1-xSrxTiO3 thin films deposited on stainless steel substrates by sol-gel spin coating followed with thermal annealing at T = 650°C is reported. Results of thermal behavior of the sol-gel derived powders with compositions used for fabrication of graded structure (i.e. with Sr mole fraction x = 0.5, 0.4 and 0.3) are described. X-ray diffraction...
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The influence of water and mineral oil on volumetric losses in the displacement pump for offshore and marine applications
PublikacjaIn this paper volumetric losses in a positive displacement pump supplied with water and mineral oil are described and compared. The experimental tests were conducted using a prototype of a satellite pump (with a non-circular tooth working mechanism). In this paper the sources of volumetric losses in this pump are characterised. On this basis, a mathematical model of these losses has been presented. The results of the calculation...
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The Drop-in-Drop Encapsulation in Chitosan and Sodium Alginate as a Method of Prolonging the Quality of Linseed Oil
PublikacjaNowadays, the encapsulation of sensitive products by various techniques has become popular as a promising preservation method. In particular, this applies to oils with a high content of unsaturated fatty acids and a high susceptibility to deterioration. This work presents the possibility of using a chitosan and sodium alginate in the form of a hydrogel membrane to protect food ingredients such as linseed oil, which is stored in...
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Load effect impact on the exploitation of concrete machine foundations used in the gas and oil industry
PublikacjaMachine foundations is a critical topic in the gas and oil industry, which design and exploitation require extensive technical knowledge. Machine foundations are the constructions which are intended for mounting on it a specific type of machine. The foundation has to transfer dynamic and static load from machine to the ground. The primary difference between machine foundations and building foundations is that the machine foundations...
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THE INFLUENCE OF WATER AND MINERAL OIL ON MECHANICAL LOSSES IN THE DISPLACEMENT PUMP FOR OFFSHORE AND MARINE APPLICATIONS
PublikacjaIn this paper mechanical losses in a positive displacement pump supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted using a special design (prototype) of a satellite pump. The design of the satellite pump is presented in the article. The pump features a non-circular tooth working mechanism. This pump...
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IN VITRO PROPAGATION OF RHODODENDRON TOMENTOSUM - AN ENDANGERED ESSENTIAL OIL BEARING PLANT FROM PEATLAND
PublikacjaRhododendron tomentosum Harmaja (formerly Ledum palustre L.) is a medicinal peat bog plant native to northern Europe, Asia and North America. This plant has a distinctive aroma thanks to the presence of essential oil, to which it also owes its anti-inflammatory, analgesic, antimicrobial and insecticidal properties. However, in Europe R. tomentosum is classified as an endangered species, mainly due to degradation of peatlands. In...
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Superhydrophobic and superoleophilic melamine sponges impregnated with deep eutectic solvents for oil spill cleanup
PublikacjaThe extensive extraction of oil from the bottom of seas and oceans and its transportation by tankers increase the risk of potential environmental disasters associated with hydrocarbon fractions entering water reservoirs. Therefore, this paper presents the preparation of a simple impregnation of a melamine sponge with deep eutectic solvents (DES), which can be obtained from natural sources, including coconut oil, palm kernel oil,...
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Usuwanie hydrofobowych zanieczyszczeń ropopochodnych z gleby metodą odmywania za pomocą roztworów związków powierzchniowo czynnych = Washing out of hydrophobic organic pollutants from soil using surfactants solutions
PublikacjaBadano efektywność oczyszczania gleby zanieczyszczonej substancjami ropopochodnymi. W badaniach wykorzystano surfaktanty niejonowe z grupy oksyetylenowanych alkoholi tłuszczowych i alkilopoliglukozydów oraz biosurfaktant z grupy ramnolipidów. Efektywność odmycia gleby w zależności od rodzaju surfaktantów wahała się od 67 do 78% przy stężeniu surfaktantu 3 g/L. Wraz ze wzrostem stężenia surfaktantu w roztworze obserwowano wzrost...
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International Journal of Oil Gas and Coal Technology
Czasopisma -
Piotr Milancej dr inż.
OsobyMILANCEJ Piotr doktor nauk technicznych w zakresie budownictwa, absolwent Wydziału Hydrotechniki Politechniki Gdańskiej, rzeczoznawca SITWM NOT, legitymujący się certyfikatem Polskiego Komitetu Geotechniki, uprawniony do projektowania i kierowania robotami budowlanymi bez ograniczeń w specjalności konstrukcyjno - budowlanej. W okresie od 1988 do 2003 roku zatrudniony w Katedrze Geotechniki Politechniki Gdańskiej. Współautor publikacji...
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Journal of Soil Science and Plant Nutrition
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Evaluation of foil capacitor nonlinearities and flucuations during manufacturingoszacowanie nieliniowości i fluktuacji kondensatorów foliowych w procesie produkcyjnym.
PublikacjaPrzedstawiono dwa podejścia do problemów niezawodności elementów elektronicznych. Opisano mierzone przeciwzakłóceniowe kondensatory foliowe produkowane przez MIFLEX (Kutno), zasadę i układ do pomiaru wskaźnika trzeciej harmonicznej sygnału pobudzającego oraz jego zależność od parametrów mierzonego elementu. Przedstawiono wyniki statystyczne pomiaru parametrów funkcjonalnych oraz trzeciej harmonicznej próbek tych kondensatorów przed...
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Evaluation of foil capacitor nonlinearities and fluctuations during manufacturingOszacowanie nieliniowości i fluktuacji kondensatorów foliowych w procesie produkcyjnym
PublikacjaPrzeanalizowano nieliniowości i właściwości szumowe kondensatorów w celu ustalenie kryteriów testowania nieniszczącego i selekcji kondensatorów przeciwzakłóceniowych do różnych klas trwałości i niezawodności. Przedstawiono wybrane wyniki eksperymentalne pomiaru kondensatorów produkowanych przez ZR MIFLEX w Kutnie oraz koncepcję systemu pomiarowego przeznaczonego do implementacji tych pomiarów w procesie produkcyjnym.
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Improving the Performance of a Graphite Foil/Polyaniline Electrode Material by a Thin PEDOT:PSS Layer for Application in Flexible, High Power Supercapacitors
PublikacjaIn this study, we present a novel strategy for enhancing polyaniline stability and thus obtaining an electrode material with practical application in supercapacitors. A promising (graphite foil/polyaniline/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) GF/PANI/PEDOT:PSS) electrode material was characterized and used in the construction of a symmetric supercapacitor that provides an outstanding high power density. For this...
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Influence of Installation Effects on Pile Bearing Capacity in Cohesive Soils – Large Deformation Analysis Via Finite Element Method
PublikacjaIn this paper, the whole process of pile construction and performance during loading is modelled via large deformation finite element methods such as Coupled Eulerian Lagrangian (CEL) and Updated Lagrangian (UL). Numerical study consists of installation process, consolidation phase and following pile static load test (SLT). The Poznań site is chosen as the reference location for the numerical analysis, where series of pile SLTs...
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Geochemical fractionation and spectroscopic fingerprinting for evaluation of the environmental transformation of potentially toxic metal(oid)s in surface–subsurface soils
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Friction and wear behaviour of self mated DLC and DLC-W coatings in water or salt in water solution lubricated sliding
PublikacjaPrzedstawiono wyniki badań powłok ceramicznych DLC oraz DLC z wolframem (DLC-W) nałożonych na podłoże ze stali nierdzewnej,przy tarciu ślizgowym , w modelowym skojarzeniu o styku konforemnym (płaskie czoło obracającej się względem swojej osi tulei - powierzchnia płaska). Badania prowadzono stosując smarowanie wodą destylowaną albo wodnym roztworem soli - NaCl. Wyznaczano współczynniki tarcia oraz intensywność zużywania ceramicznej...
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Effect of crystalline emulsifier composition on structural transformations of water-in-oil emulsions: Emulsification and quiescent conditions
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The conception of uncertainty analysis of reliability assessment of the MC type diesel engine lubricating oil system
PublikacjaOmówiono elementy składające się na niepewność oszacowania niezawodności instalacji oleju smarowego dla silników typu MC. Przedstawiono, posługując się przykładem obliczeniowym, koncepcję analizy niepewności oceny rozpatrywanej instalacji. Ponadto zaproponowano sposób interpretacji otrzymanego wyniku, obarczonego dużą niepewnością, przy użyciu liczb rozmytych.
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Silica-Polyethylene Glycol Matrix Synthesis by Sol-Gel Method and Evaluation for Diclofenac Diethyloammonium Release
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Corrosion-erosion damage of heat exchanger tubes by desalted crude oil flowing at shell side
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Oil spill response planning tool for estimating the recovery capability of mechanical skimming systems potential
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An efficient method of Yarrowia lipolytica immobilization using oil- and emulsion-modified bacterial cellulose carriers
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A probabilistic model estimating oil spill clean-up costs – A case study for the Gulf of Finland
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A probabilistic model for accidental cargo oil outflow from product tankers in a ship–ship collision
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Chemical Composition, In Vitro and In Situ Antimicrobial and Antibiofilm Activities of Syzygium aromaticum (Clove) Essential Oil
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Plant Extracts Containing Saponins Affects the Stability and Biological Activity of Hempseed Oil Emulsion System
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Application of an extended DLVO theory for the calculation of the interactions between emulsified oil droplets in alcohol solutions
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Fatty Acids Composition of Mustard Oil from Two Cultivars and Physico-chemical Characteristics of the Seeds
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The influence of type of dispersed phase on rolling contact fatigue of lubricating greases on mineral base oil
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Synergisms and antagonisms between MoS2 nanotubes and representative oil additives under various contact conditions
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Mathematical model defining volumetric losses of hydraulic oil compression in a variable capacity displacement pump
PublikacjaThe objective of the work is to develop the capability of evaluating the volumetric losses of hydraulic oil compression in the working chambers of high pressure variable capacity displacement pump. Volumetric losses of oil compression must be determined as functions of the same parameters, which the volumetric losses due to leakage, resulting from the quality of design solution of the pump, are evaluated as dependent on and also...
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Corrosion-erosion damage of heat exchanger tubes by desalted crude oil flowing at shell side.
PublikacjaRurki wymiennika zostały uszkodzone lokalnie przez odsoloną ropę naftową przepływającą pod ciśnieniem 2,6 MPa i w temperaturze 385-395K. Większość powierzchni rurek nie była uszkodzona i była pokryta osadem związków organicznych i nieorganicznych, zabezpieczającym przed uszkodzeniami. Badania wykluczyły możliwość występowania intensywnej korozji elektrochemicznej na powierzchniach rurek pozbawionych osadu. Przyczyną perforacji...
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On possible lowering fuel oil consumption by differentiating loads on ship diesel engines running in parrallel.
PublikacjaPodano możliwości zmniejszenia zużycia paliwa przez silniki okrętowe pracujące równolegle dzieki różnicowaniu ich obciążeń eksploatacyjnych. Zaprezentowano podstawy teoretyczne oraz sposób postępowania przy pomiarach zużycia paliwa w czasie rzeczywistym.
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Superhydrophobic sponges based on green deep eutectic solvents for spill oil removal from water
PublikacjaThe paper described a new method for crude oil-water separation by means of superhydrophobic melamine sponges impregnated by deep eutectic solvents (MS-DES). Due to the numerous potential of two-component DES formation, simple and quick screening of 156 non-ionic deep eutectic solvents using COSMO-RS (Conductor-like Screening Model for Real Solvents) computational model was used. DES which were characterized by high solubility...
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Modeling of Accidental Bunker Oil Spills as a Result of Ship's Bunker Tanks Rupture - a Case Study
PublikacjaAIS (Automatic Identification System) data analysis is used to define ship domain for grounding scenarios. The domain has been divided into two areas as inner and outer domains. Inner domain has clear border, which is based on ship dynamic characteristics. Violation of inner domain makes the grounding accident unavoidable. Outer domain area is defined with AIS data analyzing. Outer domain shows the situation of own ship in compare...
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ASSESSMENT OF GOLD AND/OR CRUDE OIL AS INVESTMENTS FOR PORTFOLIO DIVERSIFICATION. A WARSAW STOCK EXCHANGE CASE STUDY
PublikacjaThe purpose of the study is to assess whether the inclusion of investments in gold and/or crude oil improves an investment portfolio consisting of shares of enterprises included in the WIG20 index (traditional invest-ments). All possible combinations of investment portfolios with minimal risk and maximum efficiency were tested. The portfolios were determined based on Markowitz’s portfolio theory. All results were compared...
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An experimental assessment on a diesel engine powered by blends of waste-plastic-derived pyrolysis oil with diesel
PublikacjaThe utilization of plastic solid wastes for sustainable energy production is a crucial aspect of the circular economy. This study focuses on pyrolysis as an effective method to convert this feedstock into renewable drop-in fuel. To achieve this, it is essential to have a comprehensive understanding of feedstock composition, pyrolysis process parameters, and the physicochemical characteristics of the resulting fuel, all correlated...
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Eco-friendly modification of bitumen: The effects of rubber wastes and castor oil on the microstructure, processability and properties
PublikacjaThe bitumen industry in the European Union is facing several difficulties, including rising demand, unstable oil supply, rising prices for synthetic polymer modifiers, and a focus on lowering carbon footprint. Bitumen modification with crumb rubber (CR) is one of the most promising solution to these challenges. However, CR-modified bitumen have poor processability and low storage stability. To overcome these flaws we are introducing...
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Underwater Electrochemical Offshore Tests of a Paint Coating Applied in Water on the Legs of an Oil Production Platform
PublikacjaThis paper presents the methodology developed for underwater measurements using electrochemical impedance spectroscopy (EIS) technique, aimed at determining the resistance of an epoxy coating applied in seawater to the legs of an oil production platform. Performing such underwater tests in an offshore environment was technically challenging. The results of measurements obtained on the platform were confronted with comparative results...
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Air bubble and oil droplet interactions in centrifugal fields during air-sparged hydrocyclone flotation
PublikacjaWzajemne oddziaływania pęcherzyka powietrza i kropli oleju w polu siły odśrodkowej były rozpatrywane w odniesieniu do warunków procesowych obecnych podczas flotacji za pomocą hydrocyklonu. Efektywności zetknięcia się kropli oleju z pęcherzykami powietrza zostały zidentyfikowane jako znacząco mniejsze w porównaniu do efektywności zetknięcia się cząstek minerałów. Wyznaczono czasy zderzenia i styku ślizgowego. Chociaż przyczepność...
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The role of centrifugal partition chromatography in the removal of β-asarone from Acorus calamus essential oil
PublikacjaΒ-asarone is a phenylpropane derivative present in the rhizomes of Acorus calamus, that was proved to exhibit toxic effects in humans. Because of its presence the whole plant that is commonly used in traditional medicine for its sedative, anti-inflammatory, neuroprotective and other properties has limited application nowadays. In the study, qualitative and quantitative analysis of a collection of nine essential oil (EO) samples...
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Spectroscopic studies of Nb-doped tricalcium phosphate glass-ceramics prepared by sol-gel method
PublikacjaCalcium-phosphate based glasses and glass-ceramics play a crucial role in the tissue engineering development. Apart from their high biocompatibility and excellent ability to undergo varying degrees of resorbability1, they exhibit relatively high bioactivity and due to that they are commonly used as bone and dental implants. A substantial research effort is devoted to improve calcium-phosphate materials physico-chemical properties...
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The influence of Nigella sativa essential oil on proliferation, activation, and apoptosis of human T lymphocytes in vitro
PublikacjaIn previous work, we tested the immunomodulatory effect of Nigella sativa (NS) fatty oil. Our results demonstrated that unrefined, obtained by cold pressing black cumin seed oil inhibited lymphocytes’ proliferation and induced their apoptosis in a dose-dependent manner. In this study, we examined the immunomodulatory properties of essential oil (EO) obtained from the NS seeds by hydrodistillation and its two main constituents:...