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    Wyświetlanie 1-14 z 14
    Tytuł:
    Filtering techniques to improve efficiency of leak localization in pipelines
    Autorzy:
    Ostapkowicz, Paweł
    Powiązania:
    https://bibliotekanauki.pl/chapters/32304241.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    leaks
    pipelines
    leak detection systems
    gradients
    Opis:
    This work presents very simple and efficient filtering techniques to improve the accuracy of the localization procedure based on gradient increments. The procedure can be successfully used to localize a location of leakage that occurred during steady-state pipeline conditions. It also shows possibilities of using the procedure to localize a leak point related to the occurrence of a leak in transient state. The effectiveness of the filtering techniques has been proven by the results of localization errors in function of time response. They relate to the use of real measured pressure signals obtained for the experiments with simulated small leaks between 0.2–0.8% of nominal flow rate. The experiments were carried out on the pilot pipeline described earlier.
    Źródło:
    Methods and tools in CAD – selected issues; 119-132
    9788366391871
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the Vertical Distribution Pattern of Indoor Climate Parameters in the Greenhouse Heated in the Winter Period
    Autorzy:
    Boyaci, Sedat
    Başpınar, Ayşe
    Atilgan, Atilgan
    Rolbiecki, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/27322948.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    greenhouse
    environmental control
    heterogeneous environment
    microclimate gradients
    Opis:
    Ensuring the homogeneity of the indoor climate throughout the greenhouse is very important for uniform plant cultivation. In the study carried out to determine the indoor climate distribution in the heated greenhouse in the terrestrial climate, indoor temperature, relative humidity, dew point and vapour pressure deficit values were measured from 8 different measurement points. The distribution pattern of the measurement points was made horizontally and vertically at 2, 4 and 6 meters. Sensor placements are grouped vertically at 2 meters (G1: S1, S2 S3), at 4 meters (G2: S4, S5, S6) and at 6 meters (G3: S7, S8). Measurements taken during the day are divided into three parts. The climatic changes in the greenhouse were monitored as daily (00:00-23:30), daytime (08:30-17:30) and night (18:00-08:00) hours. According to the results obtained from the research, it was determined that the indoor climate parameters in the greenhouse change during the average daily, daytime and night hours at different times of the day and at different locations. According to this, it has been determined that it is important for better regulation of the greenhouse climate by monitoring the changes in the plant level as it rises from the greenhouse floor to the ridge with multiple sensors instead of a single sensor.
    Źródło:
    Rocznik Ochrona Środowiska; 2023, 25; 105--111
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The importance of the formation and fracture pressures for the selection of the depths for casing setting in Slovakia
    Autorzy:
    Pinka, J.
    Kucirkova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/298914.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    casing strings
    fracture pressure
    pore pressure
    fracture gradients
    Opis:
    Different oil companies place shallow casing strings at different depths. Apparently there is no general method or procedure that gives the optimal location. This article is an attempt to define this optimum casing seat location. The potential benefits will improve safety and economy of the operation. The two major factors determine the depth of the casing shoe, that is, the fracture pressure and the pore pressure. A third factor is the lithology, because it is desirable to place the casing shoe in a competent shale section. The methods of predicting fracture gradients for deeper wells already exist. In this article, a method of predicting fracture gradients for shallow well has been derived. This method is combined with kick tolerance criteria to obtain a casing depth selection method. Also, the variation in fracture pressures at any depth has been investigated.
    Źródło:
    AGH Drilling, Oil, Gas; 2015, 32, 2; 381-394
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Constraints of the MAX4781 CMOS Solution for Electrode Switching in Multilayer Electrochemical Probes
    Autorzy:
    Cimpoiasu, V.M.
    Radulescu, F.
    Nealson, K.H.
    Moga, Ioana Corina
    Popa, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106598.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sensor
    SPEAR
    multielectrode
    redox interface
    sediments
    electrochemical gradients
    Opis:
    The most common means to analyze redox gradients in sediments is by push/pulling electrochemical probes through sediment’ strata while repeating measurements. Yet, as electrodes move up and down they disrupt the texture of the sediment layers thus biasing subsequent measurements. This makes it difficult to obtain reproducible measurements or to study the evolution of electrochemical gradients. One solution for solving this problem is to eliminate actuators and electrode movements altogether, while instead deploying probes with numerous electrodes positioned at various depths in the sediment. This mode of operation requires electrode switching. We discuss an electrode-switching solution for multi-electrode probes, based on Complementary Metal-Oxide-Semiconductor (CMOS) multiplexors. In this solution, electrodes can be individually activated in any order, sequence or time frame through digital software commands. We discuss constraints of CMOS-based multilayer electrochemical probes during cyclic voltammetry.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 691--694
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gradients and canonical transformations
    Autorzy:
    Zampieri, Gaetano
    Powiązania:
    https://bibliotekanauki.pl/articles/1293932.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    non-injective local diffeomorphisms
    gradients
    Legendre transform
    canonical transformations
    Opis:
    The main aim of this paper is to give some counterexamples to global invertibility of local diffeomorphisms which are interesting in mechanics. The first is a locally strictly convex function whose gradient is non-injective. The interest in this function is related to the Legendre transform. Then I show two non-injective canonical local diffeomorphisms which are rational: the first is very simple and related to the complex cube, the second is defined on the whole ℝ⁴ and is obtained from a recent important example by Pinchuk. Finally, a canonical transformation which is also a gradient (of a convex function) is provided.
    Źródło:
    Annales Polonici Mathematici; 1999, 72, 2; 153-158
    0066-2216
    Pojawia się w:
    Annales Polonici Mathematici
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Taxonomic surrogacy in the diversity assessment of the soft-bottom macrofauna along a depth gradient of an Antarctic fjord
    Autorzy:
    Jóźwiak, Piotr
    Pabis, Krzysztof
    Jażdżewska, Anna
    Siciński, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2041916.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Antarctic
    King George Island
    Admiralty Bay
    ecological gradients
    species richness
    Źródło:
    Polish Polar Research; 2018, 39, 4; 505-524
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-stage classification approach for human detection in camera video in bulk ports
    Autorzy:
    Mi, C.
    Zhang, Z.
    He, X.
    Huang, Y.
    Mi, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/259499.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Human Detection
    Histograms of Oriented Gradients
    Support Vector Machine
    classification
    Opis:
    With the development of automation in ports, the video surveillance systems with automated human detection begun to be applied in open-air handling operation areas for safety and security. The accuracy of traditional human detection based on the video camera is not high enough to meet the requirements of operation surveillance. One of the key reasons is that Histograms of Oriented Gradients (HOG) features of the human body will show great different between front & back standing (F&B) and side standing (Side) human body. Therefore, the final training for classifier will only gain a few useful specific features which have contribution to classification and are insufficient to support effective classification, while using the HOG features directly extracted by the samples from different human postures. This paper proposes a two-stage classification method to improve the accuracy of human detection. In the first stage, during preprocessing classification, images is mainly divided into possible F&B human body and not F&B human body, and then they were put into the second-stage classification among side human and non-human recognition. The experimental results in Tianjin port show that the two-stage classifier can improve the classification accuracy of human detection obviously.
    Źródło:
    Polish Maritime Research; 2015, S 1; 163-170
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Necessary optimality conditions for nonsmooth two-dimensional control systems described by Roessers model
    Autorzy:
    Studniarski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/206015.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    sterowanie optymalne
    generalized gradients
    necessary conditions
    optimal control
    two-dimensional discrete systems
    Opis:
    Necessary optimality conditions for nonlinear nonsmooth two-dimensional discrete control systems are derived. Under additional convexity assumptions, these conditions can be obtained in the form of a maximum principle. For some special cases, sufficient optimality conditions are also presented.
    Źródło:
    Control and Cybernetics; 1998, 27, 1; 51-61
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeolatitudinal gradients along the southeastern Palaeo-Pacific margin and the distribution of Early Jurassic bivalves
    Autorzy:
    Damborenea, S. E.
    Echevarria, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077321.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    South America
    bivalves
    palaeolatitudal gradients
    palaeogeography
    Early Jurassic
    Ameryka Południowa
    małże
    paleogeografia
    jura wczesna
    Opis:
    Presence-absence bivalve species data for each Early Jurassic stage along southeastern South America between 20 and 46°S present-day latitude were processed by a set of analytical methods to analyse the palaeolatitudinal patterns of diversity and distribution. The expected decrease in species diversity towards higher latitudes is punctuated by a consistent local diversity increase between 34 and 42°, especially evident during Pliensbachian and Toarcian times, which may be due to an abrupt change in palaeogeography at that latitude, coinciding with the Curicó direct connection to the open ocean and the establishment of an increased variety of habitats within the extensive Neuquén Basin. The proportions of systematic groups show relative increases towards both higher latitudes (Crassatelloidea, Nuculanoidea, Pectinoidea, Monotoidea, Inoceramoidea) and lower latitudes (Trigonioidea, Pholadomyoidea, Limoidea, Lucinoidea). Epifaunal bivalves were dominant during the Hettangian but by Pliensbachian–Toarcian times they were less common than infaunal ones, while semi-infaunal species had low diversities during the whole Early Jurassic. This study suggests that (a) large scale geographical conditions should be taken into account for the analysis of latitudinal diversity trends among benthonic faunas; and (b) latitudinal trends of some living bivalve lineages may have a longer and more complex history than previously thought.
    Źródło:
    Volumina Jurassica; 2015, 13, 1; 3--16
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Training neural networks with a hybrid differential evolution algorithm
    Uczenie sieci neuronowych hybrydowym algorytmem opartym na differential evolution
    Autorzy:
    Bandurski, K.
    Kwedlo, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/341051.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    sieci neuronowe
    differential evolution
    gradienty sprzężone
    minima lokalne
    neural networks
    conjugate gradients
    local minima
    Opis:
    A new hybrid method for feed forward neural network training, which combines differential evolution algorithm with a gradient-based approach is proposed. In the method, after each generation of differential evolution, a number of iterations of the conjugate gradient optimization algorithm is applied to each new solution created by the mutation and crossover operators. The experimental results show, that in comparison to the standard differential evolution the hybrid algorithm converges faster. Although this convergence is slower than that of classical gradient based methods, the hybrid algorithm has significantly better capability of avoiding local optima.
    W artykule przedstawiono nową, hybrydową metodę uczenia sieci neuronowych, łączącą w sobie algorytm Differential Evolution z podejściem gradientowym. W nowej metodzie po każdej generacji algorytmu Differential Evolution, każde nowe rozwiązanie, powstałe w wyniu działania operatorów krzyżowania i mutacji, poddawane jest kilku iteracjom algorytmu optymalizacji wykorzystującego metodę gradientów sprzężonych.Wyniki eksperymentów wskazują, że nowy, hybrydowy algorytm ma szybszą zbieżność niż standardowy algorytm Differential Evolution. Mimo, iż zbieżność ta jest wolniejsza, niż w przypadku klasycznych metod gradientowych, algorytm hybrydowy potrafi znacznie lepiej unikać minimów lokalnych.
    Źródło:
    Zeszyty Naukowe Politechniki Białostockiej. Informatyka; 2009, 4; 5-17
    1644-0331
    Pojawia się w:
    Zeszyty Naukowe Politechniki Białostockiej. Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Subsurface imaging of fluvial deposits of the Wisła River valley in Kraków (southern Poland) by 2D ERT survey
    Autorzy:
    Bania, Grzegorz
    Woźniak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2201218.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    electrical resistivity tomography
    ERT
    gradients of interpreted resistivity
    2D ERT modeling
    fluvial deposits
    Wisła River valley
    southern Poland
    Opis:
    We describe the application of 2D ERT (electrical resistivity tomography) surveys to investigate the spatial complexity of fluvial deposits of the Wisła River valley in the eastern part of Kraków (southern Poland). All ERT survey lines were completed within the industrially influenced floodplain of the Wisła River at two research sites. Due to the transformation of the natural state of the environment through many years of industrial activity of the ArcelorMittal Kraków plant, some of the geomorphological elements analysed have been irretrievably transformed and hidden by anthropogenic accumulations such as waste landfills and engineering structures. Hence, many years of soil contamination have changed the primary resistivity characteristics of the subsurface. For this purpose, the measurement array applied combines standard arrays, i.e., Wenner-Schlumberger and Dipole-Dipole, which gave improved results (higher resolution) in comparison to the standard single array. The data interpretation method was supported by the calculation and visualization of the vertical and horizontal gradients of the interpreted resistivity within the resistivity sections. This approach allowed accurate determination of resistivity boundaries on the ERT resistivity sections and thus helped lithological interpretation of the fluvial deposits in the research area. The resistivity of water in a channel located within one of the analysed areas has impacted some of the research results. Furthermore, 2D ERT forward modeling was implemented to generate synthetic datasets. The synthetic data allowed investigation of the influence of groundwater contamination on the resistivity distribution within superficial layers, and also tested the ability of the 2D ERT model to recognize the detailed spatial distribution of palaeomeander (meander scar) infills. All methods have provided new information on the industrially influenced floodplain of the Wisła River in Kraków.
    Źródło:
    Geological Quarterly; 2022, 66, 3; art. no. 23
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on human silhouette detection methods for a non-cooperative biometric system
    Autorzy:
    Kacperski, D.
    Włodarczyk, M.
    Grabowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/397871.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    biometrics
    human silhouette detection
    noncooperative detection
    Viola-Jones
    histogram of gradients
    background subtraction
    biometria
    detekcja sylwetki człowieka
    histogram gradientów
    odejmowanie tła
    Opis:
    Together with the development of effective and efficient people identification algorithms, biometric authentication systems become increasingly popular and widespread, leading to a significant growth in the number of institutions interested in implementing and using such systems. Although, several research works focused their efforts on these type of solutions, none of the commonly available systems provide a non-cooperative approach to object identification. For this reason, they are not suitable for use in some specific situations, such as people entering the stadium. Therefore, we decided to go up against these limitations and develop biometric identification system for less constrained scenarios. In this paper, we present an evaluation of different algorithms suitable for human silhouette detection in such environment. We focus on investigating their effectiveness and performance under unconstrained conditions, such as different lighting.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2015, 6, 1; 10-13
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of non-linear free vibration of FGM nano-beams based on the conformable fractional non-local model
    Autorzy:
    Rahimi, Z.
    Sumelka, W.
    Shafiei, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/201202.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FGM nano beam
    nonlinear free vibration
    fractional calculus
    integer stress
    non-integer stress
    gradient’s order
    fractional non-local model
    rachunek różniczkowy
    FGM
    drgania swobodne
    Opis:
    Continuum models generalized by fractional calculus are used in different mechanical problems. In this paper, by using the conformable fractional derivative (CFD) definition, a general form of Eringen non-local theory as a fractional non-local model (FNM) is formulated. It is then used to study the non-linear free vibration of a functional graded material (FGM) nano-beam in the presence of von-Kármán non-linearity. A numerical solution is obtained via Galerkin and multiple scale methods and effects of the integer and non-integer (fractional) order of stress gradient (in the non-local stress-strain relation) on the ratio of the non-local non-linear natural frequency to classical non-linear natural frequency of simply-supported (S-S) and clamped-free (C-F) FGM nano-beams are presented.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 737-745
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ termicznego efektu Marangoniego na kinetykę rozpościerania substancji ropopochodnych na morzu
    Thermal Marangoni Effect on Crude Oil Substance Spreading Kinetics on the Sea
    Autorzy:
    Boniewicz-Szmyt, K.
    Pogorzelski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/342253.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni
    Tematy:
    pochodne ropy naftowej
    kinetyka rozpościerania
    gradienty temperatury
    cyrkulacja Benarda-Marangoniego
    efekt Marangoniego
    crude oil derivatives
    spreading kinetics
    temperature gradients
    Benard-Marangoni circulation
    Marangoni effect
    Opis:
    Dynamikę rozpościerania ciekłych węglowodorów na powierzchni oryginalnej wody morskiej, badano w warunkach laboratoryjnych. Szybkość ekspansji soczewek olejowych, przewidywana przez klasyczną teorię, okazała się większa o czynnik 6–9 od wartości mierzonej eksperymentalnie. W artykule postuluje się, że ta niezgodność wynika z aktywacji tzw. cyrkulacji Benarda-Marangoniego, szczególnego ruchu płynu, bezpośrednio pod powierzchnią ekspandującej cienkiej warstwy węglowodoru, obserwowanego dla lotnych cieczy. Pionowy gradient temperatury ?Tcool, proporcjonalny do szybkości parowania, wywołany efektem schłodzenia powierzchni w procesie parowania, okazał się dostatecznie duży, aby przekroczyć wartość progową dla wszystkich badanych cieczy i wywołał efekt Marangoniego. Dodatkowy turbulentny przepływ płynu, towarzyszący rozpościeraniu oleju, prawdopodobnie powoduje spowolnienie szybkości ekspansji. Klasyczny efekt Marangoniego (powodowany naturalnymi surfaktantami) ma nieznaczny udział w procesach mieszania i rozpościerania w morzu.
    Dynamics of liquid hydrocarbons spreading over the seawater surface was studied in laboratory conditions. Oil lens expansion rates predicted from classical theories were higher 6–9 times than these measured experimentally. Such a discrepancy could result from onset of Benard-Marangoni cellular flow beneath the expanding oil, observed for volatile hydrocarbons. The vertical temperature gradient ?Tcool related to the evaporation rate was high enough to initiate Marangoni thermal phenomenon. The additional dissipative, turbulent flow is likely to slow down the spreading. The classical Marangoni effect is of secondary importance in reference to the thermal effect in interfacial spreading and mixing processes at sea.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Gdyni; 2017, 100; 20-36
    1644-1818
    2451-2486
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Gdyni
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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