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Search results for: BATHROOM SCALE
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Nonlinear phenomena of small-scale sound in a gas with exponential stratification
PublicationThe nonlinear dynamics of perturbations, quickly varying in space, with comparatively large characteristic wavenumbers k: k>1/H, is considered. H is the scale of density and pressure reduction in unperturbed gas, as the coordinate (H is the so-called height of the uniform equilibrium gas). Coupling nonlinear equations which govern the sound and the entropy mode in a weakly nonlinear flow are derived. They describe the dynamics...
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Dissolved oxygen tracking and control of blowers at fast time scale.
PublicationNapowietrzanie jest bardzo ważnym i drogim procesem w oczyszczalni ścieków. Tlen jest podstawowym składnikiem dla procesów biologicznych. System napowietrzania jest skomplikowanym, hybrydowym, nieliniowym, dynamicznym systemem z dynamiką szybszą w porównaniu z wewnętrzną dynamiką tlenu rozpuszczonego w reaktorze biologicznym. Obecnie stosowane systemy sterowania są dalekie od zadowalających. Koszt pompowania powietrza do reaktora...
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Confined granular flow in silos with inserts - full-scale experiments
PublicationArtykuł omawia wyniki doświadczalne przepływów silosowych w silosach w naturalnej skali ze wstawkami. Podczas doświadczeń pomierzono przemieszczenia oraz napór na ściany. Zastosowano różne typy wstawek położone na różnej wysokości. Wyniki badań doświadczalnych porównano z przepływami bez wstawek.
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Numerical investigations on early indicators of fracture in concrete at meso-scale.
PublicationFracture is a major reason of the global failure of concretes. The understanding of fracture is important to ensure the safety of structures and to optimize the material behaviour. In particular an early prediction possibility of fracture in concretes is of major importance. In this paper, concrete fracture under bending was numerically analysed using the Discrete Element Method (DEM). The real mesoscopic structure of a concrete...
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Scale effects in granular bodies during plane strain compression.
PublicationW arykule omówiono efekty skali w materiałach granulowanych spowodowanych wielkością próbek. Obliczenia wykonano stosując MES na bazie prawa hipoplastycznego rozszerzonego o długość charakterystyczną. Porównano różne metody regularyzacji.
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Stale austenityczne - szlachetny materiał.
PublicationPrzedstawiono skład chemiczny, struktury i właściwości stali odpornych na korozję klasy austenitycznej oraz zagrożenia uszkodzeniem i zniszczeniem tych stali.
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Technical fabrics in costruction of large scale roofs - numerical and experimental aspects
PublicationDesigning and construction of textile hanging roofs is the challenging subject for engineers. This type of structure needs geometrically and very often also physically non-linear calculations. Due to different behaviour of two families of threads (warp and weft), which during deformation can change the angle between their directions, they require special constitutive modelling. Also the loading of hanging roofs is very special....
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Application of impedance imaging to evaluation of organic coating degradation at a local scale
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A Regional Scale Analysis of Economic Convergence in Poland in the Years 2004–2012
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A probabilistic model of ship performance in ice based on full-scale data
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A study of rigorous ODE integrators for multi-scale set-oriented computations
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Comparability of Raman Spectroscopic Configurations: A Large Scale Cross-Laboratory Study
PublicationThe variable configuration of Raman spectroscopic platforms is one of the major obstacles in establishing Raman spectroscopy as a valuable physicochemical method within real-world scenarios such as clinical diagnostics. For such real world applications like diagnostic classification, the models should ideally be usable to predict data from different setups. Whether it is done by training a rugged model with data from many setups...
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iTVP: large-scale content distribution for live and on-demand video services
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Controlled oxidation of graphite to graphene oxide with novel oxidants in a bulk scale
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A non-uniform real-time speech time-scale stretching method
PublicationAn algorithm for non-uniform real-time speech stretching is presented. It provides a combination of typical SOLA algorithm (Synchronous Overlap and Add ) with the vowels, consonants and silence detectors. Based on the information about the content and the estimated value of the rate of speech (ROS), the algorithm adapts the scaling factor value. The ability of real-time speech stretching and the resultant quality of voice were...
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Time-scale modification of speech signals for supporting hearing impaired schoolchildren
PublicationA study of time scale modification algorithmsapplied to hearing impaired schoolchildren supporting ispresented. Variety of algorithms are considered, namely:overlap and add, two variations of synchronized overlapand add, and the phase vocoder. Their effectiveness as wellas real-time processing capabilities are examined.
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BalticLSC: Low-Code Software Development Platform for Large Scale Computations
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Visual Low-Code Language for Orchestrating Large-Scale Distributed Computing
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Improvement of ships seakeeping performance by application of the full-scale cfd simulations
PublicationThe ship’s fuel economy is increasingly important. The paper presents the effect of redesigning a case study ship for increasing seakeeping performance. Selected wave parameters reflect very difficult operational conditions existing on the North Sea and the Baltic Sea. The analyzed variants of a case study ship represent the latest developments of modern hull forms. The concepts similar to V-shaped bulbous bow, X-bow, X-aft, B-bow...
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Disinfection characteristics of an advanced rotational hydrodynamic cavitation reactor in pilot scale
PublicationHydrodynamic cavitation is a promising technique for water disinfection. In the present paper, the disinfection characteristics of an advanced hydrodynamic cavitation reactor (ARHCR) in pilot scale were studied. The effects of various flow rates (1.4–2.6 m3/h) and rotational speeds (2600–4200 rpm) on the removal of Escherichia coli (E. coli) were revealed and analyzed. The variation regularities of the log reduction and reaction...
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Modeling of Performance, Reliability and Energy Efficiency in Large-Scale Computational Environment
PublicationLarge scale of complexity of distributed computational systems imposes special challanges for prediction of quality in such systems.Existing quality models for lower-scale systems include functionality,performance,reliability,flexibility and usability.Among these attributes,performance and reliability have a particular significance to the large-scale systems computing quality modeling due to their strong dependence on the system...
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Experiences from operation of various expansion devices in small scale ORC
PublicationThe main aim of this paper was to present various expansion devices for an application in the small scale ORC system. The investigations were carried out in two parallel directions. One direction was to design and construct a device dedicated to the analyzed ORC system. The second direction was to adapt existing expansion devices for the needs of the analyzed ORC system. Four various devices were described and presented together...
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Modeling of Performance, Reliability and Energy Efficiency in Large-Scale Computational Environments
PublicationLarge scale of complexity of distributed computational systems imposes special challenges for prediction of quality in such systems. Existing quality models for lower-scale systems include functionality, performance, reliability, flexibility and usability. Among these attributes, performance and reliability have a particular significance to the large-scale systems computing quality modeling due to their strong dependence on the...
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Analysis of results of large-scale multimodal biometric identity verification experiment
PublicationAn analysis of a large set of biometric data obtained during the enrolment and the verification phase in an experimental biometric system installed in bank branches is presented. Subjective opinions of bank clients and of bank tellers were also surveyed concerning the studied biometric methods in order to discover and to explore relations emerging from the obtained multimodal dataset. First, data acquisition and identity verification...
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Aplication of impedance imaging to evaluation of organic coating degradation at a local scale
PublicationZaproponowano nowe podejście do oceny lokalnych właściwości elektrycznych powłok organicznych. Wykorzystuje ono mikroskop sił atomowych pracujący w trybie kontaktowym. Pomiędzy igłę mikroskopu i podłoże metalowe pokryte powłoką przykładany jest sinusoidalny napięciowy sygnał pobudzenia o zadanej częstotliwości i mierzony jest prądowy sygnał odpowiedzi. Zalety tego podejścia zostały zaprezentowane na przykładzie powłoki akrylowej...
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Technique for reducing erosion in large-scale circulating fluidized bed units
PublicationThis paper presents a methodology, implemented for a real industrial-scale circulating fluidized bed boiler, to mitigate the risk of heating surfaces exposed to an intensive particle erosion process. For this purpose, a machine learning algorithm was developed to support the boiler reliability management process. Having a tool that can help mitigate the risk of uncontrolled power unit failure without expensive and technically complex...
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Topology improvements in scale-free networks when assuring security and survivability
PublicationW artykule zaproponowano heurystyczny algorytm iteracyjny (NEA) kontrolowanego rozrostu sieci, zmniejszający stopień jej bezskalowości. Pokazano, że odpowiednia kontrola rozrostu sieci, prowadzi do uzyskania sieci o topologii zbliżonej do regularnej, a więc w duzym stopniu odpornej na celowe działania niszczące - ataki. Właściwości algorytmu zostały przebadane przy pomocy dedykowanego symulatora dla reprezentatywnej próby inicjalnych...
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Multi-scale modelling of concrete beams subjected to three-point bending
PublicationW artykule przedstawiono wyniki numeryczne MES dwuskalowego modelowania belek betonowych z nacięciem na poziomie skali makro i mezo. Obliczenia wykonano przy wykorzystaniu modelu degradacji sztywności z nielokalnym osłabieniem. Beton został opisany na poziomie skali mezo jako stochastyczny materiał 3-składnikowy złożony z kruszywa, zaczynu cementowego oraz stref kontaktu. Natomiast na poziomie skali makro został opisany jako materiał...
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A novel DEM-based pore-scale thermo-hydro-mechanical model
PublicationW warunkach nieizotermicznych ruch płynu w układzie porów i kapilar betonu jest silnie sprzężony z przenoszeniem ciepła. W takich warunkach pory i spękania ułatwiają wnikanie do betonu zewnętrznych czynników agresywnych, które degradują zarówno beton, jak i zbrojenie. Opracowano innowacyjny model termo-hydro-mechaniczny oparty na modelu DEM, aby szczegółowo śledzić frakcje cieczy/gazów w porach i pęknięciach pod kątem ich różnej...
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Meso‐scale analyses of size effect in brittle materials using DEM
PublicationThe paper describes numerical meso-scale results of a size effect on strength, brittleness and fracture in brittle materials like concrete. The discrete element method (DEM) was used to simulate the size effect during quasi-static splitting tension with the experimental-based meso-structure. The two-dimensional (2D) calculations were carried out on concrete cylindrical specimens with two diameters wherein two different failure...
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Equivalence scales for continuous distributions of expenditure
PublicationResearch background: In the actual sizable populations of households, the standard microeconomic concept of equivalence scales is intractable since its necessary condition of equality of household welfare levels is unlikely to be fulfilled. Purpose of the article: This paper aims to develop a concept of an equivalence scale, which can be suitable for continuous distributions of expenditures in the population. Methods: Using household...
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Perforating systems in shale gas recovery
PublicationHydraulic fracturing is common method of shale gas recovery. Due to environmental, economical and technological problems many alternative technologies have been developed. One of the most promising group of technologies is based on perforating systems. This paper describes theoretical and practical aspects of best known technologies used to create perforations. New perforating/fracturing technologies which can replace hydraulic fracturing...
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MOBILITY OF SHALE DRILL CUTTINGS CONSTITUENTS
PublicationThis study focuses on the abundance and mobility of metals and trace elements from shale drill cuttings into the water, being the main component of hydraulic fracturing fluid. The relationship between composition of the shale rock and the potential element release during standard water-based leaching tests was characterized by means of X-Ray Fluorescence spectroscopy (XRF). The XRF analysis confirmed the assumption of shales constituents...
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Equations with Separated Variables on Time Scales
PublicationWe show that the well-known theory for classical ordinary differential equations with separated variables is not valid in case of equations on time scales. Namely, the uniqueness of solutions does not depend on the convergence of appropriate integrals.
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“OUT OF PLACE” IN THE CITY: DEVELOPMENT OF SOCIOSPATIAL DISORDER SENSITIVITY SCALE IN URBAN SETTINGS
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Measurement invariance of the Belief in a Zero‐Sum Game scale across 36 countries
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Optimization of an axial turbine for a small scale ORC waste heat recovery system
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Utilization of internal carbon sources by a full-scale process biomass for denitrification and EBPR
PublicationDla zwiększenia efektywności denitryfikacji i zintegrowanych biologicznych procesów usuwania fosforu (z ang. EBPR) w ramach istniejących możliwości technologicznych komunalnych oczyszczalni ścieków, zaleca się korzystać z odpowiednich źródeł węgla. Ze względu na wysokie koszty zakupu konwencjonalnych źródeł węgla i wymagany (zazwyczaj) okres adaptacji mikroorganizmów biorących udział w oczyszczaniu ścieków, zwrócono uwagę na możliwość...
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Semantic URL Analytics to Support Efficient Annotation of Large Scale Web Archives
PublicationLong-term Web archives comprise Web documents gathered over longer time periods and can easily reach hundreds of terabytes in size. Semantic annotations such as named entities can facilitate intelligent access to the Web archive data. However, the annotation of the entire archive content on this scale is often infeasible. The most efficient way to access the documents within Web archives is provided through their URLs, which are...
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Numerical modeling of the combustion in a lab-scale pulverized-coal fired combustion chamber
PublicationThis work presents results of numerical modeling of the combustion process inside a lab-scale drop-tube chamber, designed to investigate the slagging properties of the flue ashes, created through the solid fuel firing. Interaction between turbulence and chemistry is accounted by use of probability density function (PDF). FLUENT inputs for non-premixed combustion chemistry modeling are defined. A discrete second phase of the coal...
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Sub‐Nanometer‐Scale Cu9S5 Enables Efficiently Electrochemical Nitrate Reduction to Ammonia
PublicationThe sub-nanometer is a key feature size in materials science. Unlike single-atom and nanomaterials, size effects and inter-component cooperative actions in sub-nanomaterials will effective on its performance is more significant. Here, 0.95 nm ordered arrangement Cu9S5 sub-nanowires (Cu9S5 SNWs) are synthesized through the co-assembly effect of inorganic nuclei (Cu9S5) and clusters (phosphotungstic acid-PTA), achieving a significant...
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Scale transformations in model exchange potentials in low energy electron-atom scattering
PublicationModel exchange potentials are particularly interesting to account for the indistinguishability between the projectile and target electrons in electron-atom scattering in vacuo and plasma environments. It is well known that their performance is pretty satisfactory in the high energies but also that discrepancies from the results obtained with exact exchange are found toward the zero energy limit. In this article, we examine how...
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The Influence of Hydrodynamic Conditions in a Laboratory-Scale Bioreactor on Pseudomonas aeruginosa Metabolite Production
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Molecular dynamics insights into protein‐glycosaminoglycan systems from microsecond‐scale simulations
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Application of Landsat 8 imagery to regional-scale assessment of lake water quality
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Oxidation Time Influence on the Structure of the Cobalt Base Clad Layer and Scale Morphology
PublicationZbadano wpływ czasu utleniania na mikrosrukutręi własności mechaniczne a w szczególności mikrotwardość, warstw wykonanych ze stopu kobaltu.Warstwy były wykonane za pomocą napawania plazmowego (PTA). Stop kobaltu podlegał utlenianiu w powietrzu w temperaturze 800 topni celsjusza w czasie 1, 22 i 200 godzin. w wyniku utleniania nastapiło uformowanie warstw zgorzeliny oraz nastapiły zmiany w mikrostrukturze. Zaobserwowano także zmiany...
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The influence of magnetic water treatment on CaCO3 scale formation in membrane distillation process
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Assessment of the histrionic self-presentation style: initial validation of the Polish version of the As-If-Scale
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Vietnamese version of the Dual Filial Piety Scale: preliminary validation in a student sample
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Modeling an Industrial Revolution: How to Manage Large-Scale, Complex IoT Ecosystems?
PublicationAdvancements around the modern digital industry gave birth to a number of closely interrelated concepts: in the age of the Internet of Things (IoT), System of Systems (SoS), Cyber-Physical Systems (CPS), Digital Twins and the fourth industrial revolution, everything revolves around the issue of designing well-understood, sound and secure complex systems while providing maximum flexibility, autonomy and dynamics. The aim of the...