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Search results for: FOULING, HYDROXYAPATITE
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Dynamic unattended measurement based routing algorithm for diffServ architecture
PublicationDynamic routing is very important in terms of assuring QoS in today's packet networks especially for streaming and elastic services. Existing solutions dedicated to dynamic routing are often too complicated and seem to be not usable in real time traffic scenarios where transferred traffic may vary significantly. This was the main reason for research and new routing mechanism proposal which should apply to today's packet networks....
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Thermal Barrier as a technique of indirect heating and cooling for residential buildings
PublicationW artykule zaprezentowano koncept pośredniego ogrzewania i chłodzenia budynków mieszkalnych promieniowaniem słonecznym zwany barierą termiczną. System składa się z polipropylenowych rurek umieszczonych w ścianach zewnętrznych, w których znajduje się płyn. Koncept jest zastosowany do stabilizacji i redukcji przepływu ciepła w kierunku prostopadłym do ścian. Wykonano obszerne obliczenia MES z zastosowaniem nowego systemu kontroli,...
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Selective Protection for All-Optical Physical Impairment Constrained Routing
PublicationW przypadku sieci optycznych, zauważalna jest obecnie tendencja dążenia do transmisji całowicie optycznej (tz. bez konwersji O/E/O w węzłach tranzytowych). Jednakże w niedalekiej przyszłości, z uwagi na techniczne ograniczenia, niemożliwa będzie obsługa całości ruchu wyłącznie w dziedzinie optycznej. Operatorzy będą więc zainteresowani oferowaniem rozwiązań przejściowych implikujących przełączanie w dziedzinie optycznej jedynie...
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Frequency-dependent coupling model for microwave band-pass filter
PublicationThe goal of this work was to create a circuit model which represents frequency-dependent coupling between microwave resonators. Our models are designed for in-line filters. The frequency-dependent coupling enables one to realize a transmission zero which is not possible in classical approach with frequency independent inverters. In addition, the proposed model allows us to observe out-of-band behavior, e.g. spurious resonance....
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The rolling contact fatigue of WC/C-coated spur gears
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Pressure dependence of electron-phonon coupling inCe3+-dopedGd3Sc2Al3O12garnet crystals
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Strong-coupling character of superconducting phase in compressed selenium hydride
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Superstable magnetic nanoreactors with high efficiency for Suzuki-coupling reactions
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Filling of Carbon Nanotubes: Containers for Magnetic Probes and Drug Delivery
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Horizontal flow boiling of refrigerants inside porous coated tube.
PublicationPrzedstawiono wyniki badań przejmowania ciepła i spadku ciśnienia podczas wrzenia czynników chłodniczych R22, R134a i R407C w poziomej rurce z wewnętrzną powłoką porowatą.
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Nucleate pool boiling modelling and experimental investigation : chapter 7
PublicationOmówiono wpływ powłoki porowatej nanoszonej na całą powierzchnię rurki lub jej fragment na osiągany współczynnik przejmowania ciepła, krytyczne gęstości strumienia ciepła, a także obwodowy rozkład temperatury przy wrzeniu pęcherzykowym na zewnętrznej powierzchni poziomej rurki.Przedstawiono wyniki badań częstotliwości odrywania się pęcherzyków oraz pól prędkości wokół wzrastającyh i unoszących się pęcherzyków przy wrzeniu z pojedynczych...
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Improved correlation for modelling of boiling processes in small diameter tubes.
PublicationW pracy przedstawiono rozważania na temat wrzenia w przepływie dwufazowym w kanałach o małej średnicy. Modyfikacji uległa korelacja zapostulowana wcześniej przez Mikielewicz i inni, poprzez wprowadzenie efektów związanych z napięciem powierzchniowym, także liczba konwekcyjna została poprawiona. Zastosowanie korelacji jest bardzo proste z uwagi na jej analityczną postać, co jest jej podstawową zaletą. Porównanie z danymi eksperymentalnymi...
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Appraisement of modifications in dynamic routing protocols to support the IPng Protocol
PublicationW pracy, biorąc pod uwagę dynamiczny proces migracji sieci IPv4 do nowej wersji protokołu IP, przedstawiono konieczność realizacji w Internecie nowych protokołów routingu dynamicznego lub adaptacji już istniejących do nowego protokołu IPng. W artykule przedstawiono sposoby dostosowania protokołów routingu dynamicznego RIP, OSPF, BGP do nowego protokołu IP. Oceniono wpływ w/w dostosowywania na zbieżność i skalowalność protokołów...
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Ad hoc routing protocols - security objectives, threats and solution
PublicationZaprezentowano przykładowe strategie routingu stosowane w bezprzewodowych sieciach ad-hoc z transmisją wieloetapową. Dokonanao przegladu protokołow routingu, zidentyfikowano podstawowe typy ataków i zagrożenia integralności i poufności transmisji w sieciach bezprzewodowych. Przedstawiono przykładowe rozwiazania algorytmów routingu.
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Eigenvalue approach to synthesis of prototype filters with source/load coupling
PublicationArtykuł przedstawia nową, szybko zbieżną, technikę syntezy macierzy sprzężeń filtrów o charaktrystyce Czebyszewa. Synteza opiera się na zastosowaniu metody najmniejszych kwadratów w odniesieniu do wartości własnych macierzy sprzężeń oraz jej podmacierzy.
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Cykl życiowy zespołu mieszkaniowego. Life cycle of the Housing Estate.
PublicationProjektowanie zespołu mieszkaniowego powinno uwzględniać jego oddziaływanie na środowisko przyrodniczo-społeczne. Całkowite oddziaływanie zespołu mieszkaniowego na środowisko można ocenić stosując metodę oceny cyklu życiowego wszystkich jego elemrntów. Omówiono problemy projektowania cyklu życiowego oraz zagadnienia adaptowalności budynków, projektowania uniwersalnego oraz projektowania uczestniczącego.
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Desiccant cooling system with direct fired biogas reactivitation heater.
PublicationPraca przedstawia możliwości wykorzystania w chłodnictwie i klimatyzacji gazu pochodzącego z biomasy. Spalanie gazu może zapewnić ciepło do zasilania zarówno absorpcyjnych urządzeń chłodniczych, jak i adsorpcyjnych urządzeń klimatyzacyjnych. Przedstawiono bieżące trendy występujące w konstrukcjach adsorpcyjnych urządzeń klimatyzacyjnych.
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Simplified unsteady flow routing models for flood operating systems
PublicationW pracy omówiono właściwości modeli uproszczonych transformacji przepływów nieustalonych z punktu widzenia możliwości zastosowania do sterowania falą powodziową.
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HMSE: A tool for coupling MODFLOW and HYDRUS-1D computer programs
PublicationA new software HMSE has been developed to facilitate external coupling between two well-known programs for subsurface flow modeling: MODFLOW-2005 (saturated zone flow) and HYDRUS-1D (unsaturated zone flow). Two coupling schemes have been implemented. In the first case the groundwater recharge flux is calculated by HYDRUS-1D assuming a fixed water table position and then passed to MODFLOW input files. In the second case the water...
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Comparison of Tire Rolling Resistance Measuring Methods for Different Surfaces
PublicationThe rolling resistance of car tires is one of the most important parameters characterizing tires today. This resistance has a very significant contribution to the energy consumption of wheeled vehicles. The climate crisis has forced tire and car manufacturers to place great emphasis on the environmental impact of their products. Paradoxically, the development of electric vehicles has led to an even greater importance of rolling...
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POMERANIAN LANDSCAPES OF MODERNIST ZASPA. CONCEPTS OF REVITALISATION OF THE HOUSING ESTATE
PublicationZaspa is a neighbourhood in Gdansk with a long locational history and numerous build-ups. It is situated in a complex landscape between the coastal strip and moraine hills. The housing estates built here in the 1970s followed the postulates of modernist urbanism, ignoring the topographical and natural specifics and the regional heritage. The result was an ergonomic but anonymous space with many current strengths...
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Nitrofurazone Removal from Water Enhanced by Coupling Photocatalysis and Biodegradation
Publication(1) Background: Environmental contamination with antibiotics is particularly serious because the usual methods used in wastewater treatment plants turn out to be insufficient or ineffective. An interesting idea is to support natural biodegradation processes with physicochemical methods as well as with bioaugmentation with efficient microbial degraders. Hence, the aim of our study is evaluation of the effectiveness of different...
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Sodium nitrite as a corrosion inhibitor of copper in simulated cooling water
PublicationThe corrosion inhibition behavior of sodium nitrite (NaNO2) towards pure copper (99.95%) in simulated cooling water (SCW) was investigated by means of electrochemical impedance spectroscopy (EIS) and dynamic electrochemical impedance spectroscopy (DEIS). NaNO2 interferes with metal dissolution and reduce the corrosion rate through the formation or maintenance of inhibitive film on the metal surface. Surface morphologies illustrated...
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Selected Aspects of Pavement Texture Influence on Tire Rolling Resistance
PublicationTire rolling resistance has a significant influence on fuel consumption in cars and trucks and on CO2 emissions. Rolling resistance depends on the tire construction, pavement texture and stiffness, as well as environmental and traffic conditions. This article presents a pilot study on the impact of pavement texture on the rolling resistance of passenger car tires. Reasons why Mean Profile Depth is not a good descriptor of pavement...
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Compact and Integrated High-Power Pulse Generation and Forming System
PublicationThis paper presents comprehensive analytical, numerical and experimental research of the compact and integrated high-power pulse generation and forming system based on the flux compression generator and the electro-explosive forming fuse. The paper includes the analysis of the presented solution, starting from the individual components studies, i.e., the separate flux compression generator tests in field conditions and the forming...
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Contemporary multifunctional buildings towards a sustainable development of the housing environment
PublicationDevelopment of contemporary urban centers depends on the basis that buildings present more and more complex structures in terms of size and purpose. They are referred to as multifunctional buildings. This aspiration has its origins in the development of urban centers and in the desire to optimize the built-up areas. The article presents the theory of the approach to the design of multifunctional buildings with a focus on the residential...
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Beeswax And Palmitic Acid Utilization With Heat Pipes For Electronics Cooling
PublicationThis paper presents an experimental study of heat pipes supported by phase change materials (PCMs) coated at their adiabatic sections in application for electronics cooling. The PCMs investigated in this research were palmitic acid and beeswax, the latter being considered as a more cost-effective alternative. The study focused on three powers: 20W, 25W, and 30W. The experimental results revealed that the incorporation of palmitic...
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Multimodal coupling matrix for an array of rectangular slots on conducting cylinder
PublicationArtykuł prezentuje metodę wyznaczania sprzężeń wzajemnych pomiędzy aperturami promieniującymi położonymi na przewodzącym cylindrze. Pokazano sposób wyznaczania wielorodzajowej macierzy rozproszenia reprezentującej sprzężenia własne i wzajemne w badanej strukturze.
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Pool boiling of water-Cu nanofluid on porous coated tube
PublicationPrzedstawiono wyniki pomiarów współczynnika przejmowania ciepła podczas wrzenia nanocieczy woda-Cu na poziomej rurce pokrytej aluminiową powłoka porowatą o grubości 0.15 mm i porowatości ok. 40%. Koncentracja nanocząstek wynosiła 0.01%, 0.1% oraz 1%. Badania wykonano dla trzech wartości ciśnienia wrzenia: 200 kPa, 100 kPa oraz 10 kPa.
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A distributed scheme for optimization of interdomain routing between collaborating domains
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Reduction of noise and rolling resistance by horizontal grinding of asphalt pavements
PublicationGrinding of cement concrete pavements to reduce unevenness and noise is common since a long time. Grinding is then made with wheels equipped with diamond blades rotating in the vertical plane. This creates narrow vertical/longitudinal grooves in the pavement. It is not applied to asphalt pavements. In this paper an alternative type of grinding is studied. In this case plates with diamond heads rotate in the same plane as the pavement,...
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Computing algebraic transfer entropy and coupling directions via transcripts
PublicationMost random processes studied in nonlinear time series analysis take values on sets endowed with a group structure, e.g., the real and rational numbers, and the integers. This fact allows to associate with each pair of group elements a third element, called their transcript, which is defined as the product of the second element in the pair times the first one. The transfer entropy of two such processes is called algebraic transfer...
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DESIGN AND CALIBRATION OF ROLLING RESISTANCE TEST TRAILER R2mk.2
PublicationThe paper describes construction nad calibration procedures of the rolling resistance test trailer R2 Mk2. The trailer is design to measure rolling resistance of passenger car tyres in various road conditions on trafficked road. The trailer utilizes so called angle method also known as vertical arm method. The paper presents also calibration procedures that are necessary to ascertain good precision of the measurements.
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Impact of the surface evenness and texture on tire/road rolling resistance
PublicationThis paper deals with the issue of a surface's roughness and texture impact on tire/road rolling resistance. It includes a brief description of research aims, measurements and an analysis of results. It also presents observations and conclusions regarding drum facility modernisation which allows studies concerning surface's roughness and texture impact on tire/road rolling resistance.
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Reduction of Tire Rolling Resistance by Optimization of Road Surfaces and Tires
PublicationDuring interaction between tire and road surface three very important phenomena are always in effect. One of them (very desirable) is friction that is important for traction, braking and cornering. Two other phenomena are not desirable at all, that is rolling resistance and noise. This paper discusses relations between road surface and tire parameters versus tire rolling resistance. Road surface texture, porosity, impedance, strength...
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Heat transfer characteristics of hybrid microjet -microchannel cooling module
PublicationThe paper presents the experimental investigation of heat transfer intensification in a microjet- microchannel cooling module. Applied technology takes benefits from two very attractive heat removal techniques. When jets are impinging on the surface, they have a very high kinetic energy at the stagnation point, also in microchannels boundary layer is very thin allowing to obtain very high heat fluxes. Main objective of this paper...
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Peculiarities associated with testing polyetheretherketone (PEEK) in a model rolling contact
PublicationPolyetheretherketone (PEEK) was investigated using a modified version of the four-ball tester in which the upper forth ball was replaced by a cone in such a way that kinematics of the four-ball configuration were fully preserved. Rotation of the cone enforced orbiting and rolling of the ceramic balls around the polymer cup. The results produced some unexpected peculiarities in the wear of ceramic balls which, in principle, should...
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Hardened Steel Surface Waviness Created by Rolling Burnishing Process
PublicationThe surface of the finishing machined parts is defined mainly by roughness parameters. Growing demands on the part, especially mating sliding or rolling, require the specification of additional parameters, such as waviness parameters, particularly when there is significant resistance to seizing or noise reduction. This paper presents surface waviness characteristics of hardened burnished steel.
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The Roughness of the Hardened Steel Surface Created by the Rolling-Burnishing Process
PublicationBurnishing hard materials can be used as an alternative finishing process. this paper presents the results of burnishing hardened steel. The article discusses surface deformation that occurs during this process and depends on the selected parameters of the geometric structure of the force applied for surface burnishing.
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Heat transfer characteristics of hybrid microjet – Microchannel cooling module
PublicationThe paper presents experimental investigation of heat transfer intensification in a microjet–microchannel cooling module. Applied technology takes benefits from two very attractive heat removal techniques. When jets are impinging on the surface, they have a very high kinetic energy at the stagnation point, also in microchannels boundary layer is very thin allowing to obtain very high heat fluxes. Main objective of this paper was...
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Routing decisions independent of queuing delays in broadband leo networks
PublicationThis paper presents an analysis of queuing and propagation delays of Inter-Satellite Links (ISLs) in broadband Low-Earth Orbit (LEO) satellite networks. It is shown that queuing delays are negligible in all reasonable working conditions of the broadband ISL network. This fact makes it possible to simplify the routing protocols in such networks and permits using already known multi-commodity flow solutions for routing. The performance...
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O urodzie budownictwa socjalnego = About beauty of social housing
PublicationBudownictwo socjalne jest jednym z istotnych aspektów odnowy krajobrazu miejskiego. NAjczęściej kojarzy się ono z tanią architekturą o niskich walorach estetycznych - jednak tanie wcale nie musi oznaczać brzydkie. Mozna projektować i realizować osiedla, które nie tylko zapewniaja byt uboższej zcęści społeczeństwa, ale wnoszą również istotny wkład w wizerunek miasta. Ponadto sektor budowenictwa socjalnego stanowi świetne pole dla...
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Socially sustainable housing environment = Społeczne równoważenie środowiska mieszkaniowego
PublicationOmówiono najnowsze tendencje w ksztaltowaniu środowiska mieszkaniowego, oparte na strategii przemieszania, połączenia i poczucia bezpieczeństwa. Przedstawiono realizowaną w Wielkiej Brytanii politykę wspierania zrównoważonych osiedli mieszkaniowych, określanych jako 'wspólnoty zróżnicowanych dochodów' (Mixed Income Communities) oraz wyniki badań nad trzema koncepcjami kształtowania zrównoważonego środowiska mieszkaniowego typu...
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Heat transfer during pool boiling on smooth tube bundle
PublicationPrzedstawiono wyniki pomiarów współczynnika przejmowania ciepła dla pęku 19 gładkich rurek ze stali nierdzewnej ogrzewanych elektrycznie podczas wrzenia wody destylowanej, metanolu i R141b. Zaproponowano równanie korelacyjne do obliczania średniego współczynnika przejmowania ciepła.
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Estimation of Housing Demand with Adaptive Neuro-Fuzzy Inference Systems (ANFIS)
PublicationIt has always been important to anticipate the demand for a product. To determine the demand for any product, the parameters such as the economic situation and the demands of the rival products are used generally. Especially in the housing sector, which is the locomotive sector for emerging countries, it is critical to anticipate housing demand and its relationship with economic variables. Because of that, economists, real estate...
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Pressure drop and heat transfer during boiling and condensation at subcritical region
PublicationMost of the data presented in the literature relate to saturation temperatures in the range - 20°C to 40°C due to the application in refrigeration technology. There is necessity to extend databases to higher values of saturation temperature due to new applications such as Organic Rankine Cycle and high temperature heat pumps. Only few papers contain data for high reduced pressure for low boiling point liquids. This paper focus...
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Estimation of Housing Demand with Adaptive Neuro-Fuzzy Inference Systems (ANFIS)
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Preference-based evolutionary multi-objective optimization in ship weather routing
PublicationIn evolutionary multi-objective optimization (EMO) the aim is to find a set of Pareto-optimal solutions. Such approach may be applied to multiple real-life problems, including weather routing (WR) of ships. The route should be optimal in terms of passage time, fuel consumption and safety of crew and cargo while taking into account dynamically changing weather conditions. Additionally it must not violate any navigational constraints...
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Analysis of Ceramic Elements with Ring-Crack Defects in Lubricated Rolling Contact
PublicationThe properties of ceramics, specifically low density, high hardness, high temperature capability and low coefficient of thermal expansion are of most interest to rolling element manufacturers. Surface ring cracks on lubricating rolling contact fatigue failure has been studied using numerical fracture analysis. Such cracks are very often found on ceramic bearing balls and decrease fatigue life rapidly. The numerical calculations...
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Rolling resistance and tyre/road noise on rubberised asphalt pavement in Poland
PublicationThe paper presents results of tyre/road noise and rolling resistance measurements performed on stone mastics asphalt (SMA) that contains rubberised asphalt, developed and produced by a refinery in Poland. Bituminous binder was modified with polymer and addition of crumb rubber. The first observations of asphalt mixture with the new kind of modified bitumen used on the field section are presented. Rolling resistance of passenger...