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    Wyświetlanie 1-13 z 13
    Tytuł:
    Influence of Drift on Efficiency of Optimal Analog Adaptive Communication Systems with Feedback and Its Compensation
    Autorzy:
    Jędrzejewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/227312.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    communication systems
    feedback
    drift compensation
    optimal adaptive estimation
    Opis:
    Results of analysis of drift influence on operation and efficiency of optimal analog adaptive communication systems with feedback and a new approach to drift compensation in these systems are presented in the paper. The proposed approach is based on application of the extended multidimensional adaptive algorithm that estimates simultaneously the value of a transmitted sample and the value of an unknown drift rate. The knowledge of the drift rate enables drift compensation and improves transmission efficiency of systems suffering problems related to drifts.
    Źródło:
    International Journal of Electronics and Telecommunications; 2013, 59, 1; 51-58
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic tilt testing of MEMS inclinometers based on conical motions
    Autorzy:
    Yang, Qihang
    Cai, Chenguang
    Yang, Ming
    Kong, Ming
    Liu, Zhihua
    Liang, Feng
    Powiązania:
    https://bibliotekanauki.pl/articles/2203364.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MEMS inclinometer
    sensitivity
    dynamic testing
    conical motion
    angle drift
    Opis:
    The MEMS inclinometer integrates a tri-axis accelerometer and a tri-axis gyroscope to solve the perceived dynamic inclinations through a complex data fusion algorithm, which has been widely used in the fields of industrial, aerospace, and monitoring. In order to ensure the validity of the measurement results of MEMS inclinometers, it is necessary to determine their dynamic performance parameters. This study proposes a conical motion-based MEMS inclinometer dynamic testing method, and the motion includes the classical conical motion, the attitude conical motion, and the dual-frequency conical motion. Both the frequency response and drift angle of MEMS inclinometers can be determined. Experimental results show that the conical motions can accelerate the angle drift of MEMS inclinometers, which makes them suitable for dynamic testing of MEMS inclinometers. Additionally, the tilt sensitivity deviation of the MEMS inclinometer by the proposed method and the turntable-based method is less than 0.26 dB. We further provide the research for angle drift and provide discussion.
    Źródło:
    Metrology and Measurement Systems; 2023, 30, 1; 31--47
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Statistical Approach To Prediction Of The CMM Drift Behaviour Using A Calibrated Mechanical Artefact
    Autorzy:
    Cuesta, E.
    Alvarez, B.
    Sanchez-Lasheras, F.
    Gonzalez-Madruga, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/221090.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multivariate regression models
    coordinate measuring machine
    drift behaviour
    calibration
    Opis:
    This paper presents a multivariate regression predictive model of drift on the Coordinate Measuring Machine (CMM) behaviour. Evaluation tests on a CMM with a multi-step gauge were carried out following an extended version of an ISO evaluation procedure with a periodicity of at least once a week and during more than five months. This test procedure consists in measuring the gauge for several range volumes, spatial locations, distances and repetitions. The procedure, environment conditions and even the gauge have been kept invariables, so a massive measurement dataset was collected over time under high repeatability conditions. A multivariate regression analysis has revealed the main parameters that could affect the CMM behaviour, and then detected a trend on the CMM performance drift. A performance model that considers both the size of the measured dimension and the elapsed time since the last CMM calibration has been developed. This model can predict the CMM performance and measurement reliability over time and also can estimate an optimized period between calibrations for a specific measurement length or accuracy level.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 3; 417-428
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Offset Drift Dependence of Hall Cells with their Designed Geometry
    Autorzy:
    Paun, M. A.
    Sallese, J. M.
    Kayal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226531.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hall effect sensor
    individual and residual offset drift
    temperature coefficient
    Opis:
    In this paper, the performance of CMOS Hall Effect Sensors with four different geometries has been experimentally studied. Using a characteristic measurement system, the cells residual offset and its temperature behavior were determined. The offset, offset drift and sensitivity are quantities that were computed to determine the sensors performance. The temperature coefficient of specific parameters such as individual, residua offset and resistance has been also investigated. Therefore the optimum cell to fit the best in the performance specifications was identified. The variety of tested shapes ensures a good analysis on how the sensors performance changes with geometry.
    Źródło:
    International Journal of Electronics and Telecommunications; 2013, 59, 2; 169-175
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Active Stabilization of the Beam Pointing of a High- Power KrF Laser System
    Autorzy:
    Barna, A.
    Földes, I. B.
    Bohus, J.
    Szatmári, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/221761.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diffraction-limited UV pulse
    beam-pointing stabilization
    long-term drift
    photodiode
    Opis:
    An active beam-pointing stabilization system has been developed for a high-power KrF laser system to eliminate the long-term drift of the directional change of the beam in order to have a stable focusing to a high intensity. The control of the beam direction was achieved by a motor-driven mirror activated by an electric signal obtained by monitoring the position of the focus of the output beam. Instead of large sized UV-sensitive position sensitive detectors a simple arrangement with scatter plates and photodiodes are used to measure the directionality of the beam. After the beam stabilization the long-term residual deviation of the laser shots is ~14 μrad, which is comparable to the shot-to-shot variation of the beam (~12 μrad). This deviation is small enough to keep the focal spot size in a micrometer range when tightly focusing the beam using off-axis parabolic mirrors.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 1; 165-172
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leakage Current Degradation Due to Ion Drift and Diffusion in Tantalum and Niobium Oxide Capacitors
    Autorzy:
    Kuparowitz, M.
    Sedlakova, V.
    Grmela, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/221515.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    niobium oxide capacitors
    tantalum capacitors
    leakage current
    ion diffusion
    ion drift
    Opis:
    High temperature and high electric field applications in tantalum and niobium capacitors are limited by the mechanism of ion migration and field crystallization in a tantalum or niobium pentoxide insulating layer. The study of leakage current (DCL) variation in time as a result of increasing temperature and electric field might provide information about the physical mechanism of degradation. The experiments were performed on tantalum and niobium oxide capacitors at temperatures of about 125°C and applied voltages ranging up to rated voltages of 35 V and 16 V for tantalum and niobium oxide capacitors, respectively. Homogeneous distribution of oxygen vacancies acting as positive ions within the pentoxide layer was assumed before the experiments. DCL vs. time characteristics at a fixed temperature have several phases. At the beginning of ageing the DCL increases exponentially with time. In this period ions in the insulating layer are being moved in the electric field by drift only. Due to that the concentration of ions near the cathode increases producing a positively charged region near the cathode. The electric field near the cathode increases and the potential barrier between the cathode and insulating layer decreases which results in increasing DCL. However, redistribution of positive ions in the insulator layer leads to creation of a ion concentration gradient which results in a gradual increase of the ion diffusion current in the direction opposite to the ion drift current component. The equilibrium between the two for a given temperature and electric field results in saturation of the leakage current value. DCL vs. time characteristics are described by the exponential stretched law. We found that during the initial part of ageing an exponent n = 1 applies. That corresponds to the ion drift motion only. After long-time application of the electric field at a high temperature the DCL vs. time characteristics are described by the exponential stretched law with an exponent n = 0.5. Here, the equilibrium between the ion drift and diffusion is achieved. The process of leakage current degradation is therefore partially reversible. When the external electric field is lowered, or the samples are shortened, the leakage current for a given voltage decreases with time and the DCL vs. time characteristics are described by the exponential stretched law with an exponent n = 0.5, thus the ion redistribution by diffusion becomes dominant.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 2; 255-264
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigations of a drifting cloud of droplets dispersed from aircraft
    Badania eksperymentalne znoszenia chmury kropel rozprzestrzenianych ze statku powietrznego
    Autorzy:
    Seredyn, T.
    Rowiński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/140148.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    drift
    aerial spraying
    droplets motion
    experiment
    znoszenie
    opryski z powietrza
    ruch kropel
    eksperyment
    Opis:
    With widespread use of pesticides in modern agriculture, the impacts of spray drift have become a topic of considerable interest. The drifting of sprays is a highly complex process influenced by many factors. The paper presents results of experimental research on a drifting cloud of droplets dispersing from aircraft. Experiments were conducted to quantify spray drift from aerial applications of pesticide. Parallel to the blowing wind, the measurement line 800 m long was disposed. The relationships between the relative dose and the distance of drift as well as spray density and its structure on the measuring length have been established.
    Wraz z rozwojem współczesnego rolnictwa i stosowaniem na coraz szerszą skalę pestycydów, problem znoszenia oprysków podczas ich aplikacji i po, stał sie ogromnym wyzwaniem. Od strony samego zjawiska fizycznego problem znoszenia oprysków jest bardzo skomplikowany i trudny do badań. Jest to wynikiem wpływu na proces rozpylania wielu czynników zewnętrznych. Praca ta prezentuje wyniki badań polowych dotyczących zachowania się chmury kropel rozprzestrzenionych ze statku powietrznego. Eksperymenty były prowadzone w celu ilościowego opisu zachowania się oprysku i jego rozkładu na podłożu. Równolegle do kierunku wiatru usytuowana została linia pomiarowa o długości 800 m. W oparciu o nią ustalono zależności wielkości dawki względnej od odległości znoszenia, gęstość oprysku oraz jego strukturę na długości pomiarowej.
    Źródło:
    Archive of Mechanical Engineering; 2014, LXI, 3; 393-407
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical process control of commercial force-sensing resistors
    Autorzy:
    Palacio Gómez, Carlos Andrés
    Paredes-Madrid, Leonel
    Garzon, Andrés Orlando
    Powiązania:
    https://bibliotekanauki.pl/articles/2173875.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    force sensing resistors
    FSR
    pressure sensor
    statistical process control
    hysteresis error
    drift error
    Opis:
    The manufacturing and characterization of polymer nanocomposites is an active research trend nowadays. Nonetheless, statistical studies of polymer nanocomposites are not an easy task since they require several factors to consider, such as: large amount of samples manufactured from a standardized procedure and specialized equipment to address characterization tests in a repeatable fashion. In this manuscript, the experimental characterization of sensitivity, hysteresis error and drift error was carried out at multiple input voltages () for the following commercial brands of FSRs (force sensing resistors): Interlink FSR402 and Peratech SP200-10 sensors. The quotient between the mean and the standard deviation was used to determine dispersion in the aforementioned metrics. It was found that a low mean value in an error metric is typically accompanied by a comparatively larger dispersion, and similarly, a large mean value for a given metric resulted in lower dispersion; this observation was held for both sensor brands under the entire range of input voltages. In regard to sensitivity, both sensors showed similar dispersion in sensitivity for the whole range of input voltages. Sensors’ characterization was carried out in a tailored test bench capable of handling up to 16 sensors simultaneously; this let us speed up the characterization process.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 3; 469--481
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spraying of wheat by field sprayer equipped with an air sleeve and drift guard nozzles
    Autorzy:
    Gajtkowski, A
    Powiązania:
    https://bibliotekanauki.pl/articles/65044.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spraying quality
    air sleeve
    Turbo TeeJet 110 02 VP nozzle
    drift guard nozzle
    wheat
    coverage
    spraying
    Opis:
    The quality of wheat spraying obtained white applying drift guard Turbo TeeJet 110 02 VP nozzles was tested. A standard boom and a boom equipped with an air sleeve were applied. Krukowiak-Bravo sprayer was used to test the influence of the air flux. The coverage was estimated on water sensitive papers. The spray coverage of wheat with TT 110 02 VP nozzles was satisfactory, both in case of conventional and air assisted applications.
    W celu zmniejszenia znoszenia cieczy w czasie opryskiwania roślin na sąsiednie pola, opryskiwacze polowe mogą być wyposażone w belki opryskujące standardowe z rozpylaczami antyznoszeniowymi lub eżektorowymi. Mogą też być wyposażone w belki z rękawami powietrznymi. Dodatkowy strumień powietrza ma również wpływ na jakość opryskiwania roślin. W badaniach zastosowano wariant podwójnego zabezpieczenia przed znoszeniem, czyli oprócz rękawa powietrznego na belce opryskującej zamontowano rozpylacze antyznoszeniowe. Do opryskiwania wykorzystano opryskiwacz Krukowiak-Bravo i rozpylacze Turbo TeeJet TT 110 02 VP. Jakość pokrycia powierzchni liści opryskiwanej pszenicy jest zadowalająca zarówno przy stosowaniu badanych rozpylaczy bez dodatkowego strumienia powietrza, jak i z dodatkowym strumieniem. Wpływ wydatku strumienia powietrza na jakość pokrycia wierzchołków roślin i liści w połowie wysokości roślin był zróżnicowany. Dodatkowy strumień powietrza z rękawa poprawiał jakość opryskiwania. Najlepiej jest to widoczne przy stosowaniu dawki 137 l/ha. Stopień pokrycia powierzchni dla tej dawki oraz małego i średniego wydatku powietrza (poz. 1 i 3) uzyskuje się w granicach 30- 37%. Ze względu na dość duże straty cieczy opadającej na glebę, należałoby stosowa dodatkowy strumień powietrza o małym wydatku.
    Źródło:
    Journal of Plant Protection Research; 2001, 41, 3
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Specific emitter identification using geometric features of frequency drift curve
    Autorzy:
    Zhao, Y.
    Wui, L.
    Zhang, J.
    Li, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/200575.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    specific emitter identification
    geometric features
    frequency drift
    adaptive fractional spectrogram
    support vector machine
    emiter
    cechy geometryczne
    dryf częstotliwości
    spektrogram
    Opis:
    Specific emitter identification (SEI) is a technique for recognizing different emitters of the same type which have the same modulation parameters. Using only the classic modulation parameters for recognition, one cannot distinguish different emitters of a same type. To solve the problem, new features urgently need to be developed for recognition. This paper focuses on the common phenomenon of frequency drift, defines geometric features of frequency drift curve and, finally, proposes a practical algorithm of specific emitter identification using the geometric features. The proposed algorithm consists of three processes: instantaneous frequency estimation based on the adaptive fractional spectrogram, feature extraction of frequency drift curve based on geometric methods for describing a curve and recognition process based on support vector machine. Simulation results show that the identification rate is generally more than 98% above –5 dB of signal to noise ratio (SNR), and real data experiment verifies the practical performance of the proposed algorithm.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 99-108
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Continuous update of business process trees using Continuous Inductive Miner
    Autorzy:
    Pawlak, Tomasz P.
    Górka, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/2204514.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    business process
    process mining
    business intelligence
    event log
    concept drift
    proces biznesowy
    górnictwo procesowe
    wywiad gospodarczy
    dziennik zdarzeń
    dryf koncepcji
    Opis:
    Business processes are omnipresent in nowadays economy: companies operate repetitively to achieve their goals, e.g., deliver goods, complete orders. The business process model is the key to understanding, managing, controlling, and verifying the operations of a company. Modeling of business processes may be a legal requirement in some market segments, e.g., financial in the European Union, and a prerequisite for certification, e.g., of the ISO-9001 standard. However, business processes naturally evolve, and continuous model adaptation is essential for rapid spot and reaction to changes in the process. The main contribution of this work is the Continuous Inductive Miner (CIM) algorithm that discovers and continuously adapts the process tree, an established representation of the process model, using the batches of event logs of the business process. CIM joins the exclusive guarantees of its two batch predecessors, the Inductive Miner (IM) and the Inductive Miner – directlyfollows-based (IMd): perfectly fit and sound models, and single-pass event log processing, respectively. CIM offers much shorter computation times in the update scenario than IM and IMd. CIM employs statistical information to work around the need to remember event logs as IM does while ensuring the perfect fit, contrary to IMd.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 1; art. no. e143551
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization analysis of construction scheme for large-span highway tunnel under complex conditions
    Autorzy:
    Pengfei, Jiao
    Zhang, Xiao
    Li, Xinzhi
    Jiang, Bei
    Liu, Bohong
    Zhang, Haojie
    Powiązania:
    https://bibliotekanauki.pl/articles/231477.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    materiał podobny
    tunel o dużej rozpiętości
    metoda centralnego schematu krzyżowego
    metoda podwójnego dryfu
    ściana boczna
    similar material
    large-span tunnel
    center cross-diagram method
    double drift method
    sidewall
    Opis:
    The construction process of the tunnel ground deformation regularity of surrounding rock, stability, deformation control of tunnel surface based on the requirements, combined with the characteristics of shallow tunnel with large-span. Used three-dimensional numerical simulation software, established a dynamic tunnel analysis program to simulate the construction process of center cross-diagram method and double sidewall drift method. Based on the stratum deformation, supporting force and analysis of plastic zone distribution, comparative analysis of engineering adaptability of different construction methods from the construction process and construction mechanics, get optimization tunnel construction scheme.
    Źródło:
    Archives of Civil Engineering; 2018, 64, 4/I; 55-68
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of two-storey RC frame with special base-isolation using Ruaumoko 2D program
    Autorzy:
    Alizada, A. M.
    Hamid, N. H.
    Yee, P. T. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1849806.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    izolator podstawy
    pętla histerezy
    przesunięcie między kondygnacjami
    przemieszczenie poprzeczne
    okres wibracji długi
    rama żelbetowa
    rejon sejsmiczny
    Ruaumoko 2D
    program komputerowy
    base isolator
    hysteresis loop
    inter-story drift
    lateral displacement
    vibration long period
    reinforced concrete frame
    seismic area
    software
    Opis:
    The control of structural vibrations due to ground motion can be done by the installation of a passive, active, and hybrid base isolation system. The primary function of the base isolator is to support the superstructure and provide huge horizontal flexibility and a long period of vibration. In this paper, a special HRDB base isolator is made from natural rubber with special elastic property and hardness. This base isolator is designed to support gravity loads of two-story RC building. The experimental hysteresis loop of this isolator is validated with analytical modeling hysteresis loop using Hysteresis program. The Bouc hysteresis rule was chosen as a model the hysteresis loop, and it is similar to experimental hysteresis loops. Later, a single bay two-story RC frame with a base isolation system was modeled using Ruaumoko 2D program subjected to three levels of earthquake excitations. After analyzing this frame under the 1994 Pacoima Dam Earthquake, the 1995 Kobe Earthquake and the 1940 El-Centro 1940 Earthquake. The numerical results show that this isolator is quite efficient in reducing the damage of structural and non-structural elements of the structure through minimizing inter-story drift, lateral displacement, and story acceleration. Therefore, this special HRDB based isolator is recommended to be used for low rise and medium-rise building in seismic regions.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 4; 287-301
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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