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    Tytuł:
    A Method of Identifying Dynamic Parameters of Generating Units Based on Dynamic Response During Disturbances
    Metoda identyfikacji parametrów dynamicznych jednostek wytwórczych na podstawie przebiegów pozakłóceniowych
    Autorzy:
    Bajor, M.
    Kosmecki, M.
    Wilk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/396830.pdf
    Data publikacji:
    2013
    Wydawca:
    ENERGA
    Tematy:
    genetic algorithm
    dynamic equivalent
    dynamic parameters identification
    algorytm genetyczny
    ekwiwalentowanie
    identyfikacja paremetrów dynamicznych
    Opis:
    Simulation of power system operation requires proper dynamic representation of power system components in the simulation software, i.e. correct structures and parameters of the models. However, in large, modern power systems, a lack of required information is often encountered. Identification is one of the ways to obtain the missing data. In this paper an identification method based on an implementation of genetic algorithm is proposed. Its prerequisite is the availability of the unit's response to the disturbance, for example obtained from transient fault recorders. The method is tested for a single unit, for which the response was obtained beforehand using the model with known parameters. The method can also be used to facilitate the creation of dynamic equivalents of larger parts of the power system, which is also presented in the paper.
    W artykule zaproponowano wykorzystanie algorytmu genetycznego do identyfikacji parametrów dynamicznych jednostek wytwórczych lub ekwiwalentów zastępujących obszary systemu elektroenergetycznego z wykorzystaniem przebiegów pozakłóceniowych. Zamieszczono również wyniki dwóch rodzajów testów oprogramowania, stworzonego na podstawie opracowanej metody. Testy zostały wykonane poprzez dobór parametrów pojedynczej jednostki wytwórczej oraz dla jednostki zastępczej, mającej za zadanie odwzorowanie zachowania dynamicznego większego obszaru systemu.
    Źródło:
    Acta Energetica; 2013, 4; 4-13
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automated parameter extraction of geometry dependent RF planar inductor model
    Autorzy:
    Durev, V. P.
    Gadjeva, E. D.
    Hristov, M. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/397835.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    spiralne płaskie induktory
    model RF
    parametr ekstrakcji
    S-parametry
    genetyczny algorytm
    planar spiral inductors
    RF model
    parameter extraction
    S-parameters
    genetic algorithm
    Opis:
    An approach is proposed in the present paper to parameter extraction of geometry dependent RF planar spiral inductor model. A direct extraction procedure is developed and realized in the Cadence PSpice and Cadence Probe environment based on the measured two-port S-parameters. To minimize the error for the full range of operation a Genetic Algorithm (GA) optimization procedure is applied in MATLAB environment. The approach is useful in RF model design, as the S-parameters can be easily measured for a given microelectronic technology. The proposed model extraction approach is characterized by a very good accuracy.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 3; 257-262
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combining ability analysis of some of grain yield stress indices in rapeseed (Brassica napus L.) varieties
    Autorzy:
    Rameeh, Valiollah
    Powiązania:
    https://bibliotekanauki.pl/articles/2199638.pdf
    Data publikacji:
    2012-04-19
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    diallel
    genetic parameters
    heterosis
    narrow-sense heritability and rapeseed
    Opis:
    Although most of investigations showed that nitrogen fertilizers gave substantial rapeseed yield increases even in diverse and contradicting conditions but in a few studies were focused on genetic parameters of nitrogen stress effects. Combining ability of some of important grain yield stress indices based on application and non application of nitrogen (N+ and N0) was studied using half diallel of six spring rapeseed varieties and their 15 F2 progenies. Significant mean squares of general and specific combining abilities (GCA and SCA) were observed for potential yield(Yp), Stress yield(Ys), mean productivity (MP), geometric mean productivity (GMP), tolerance index (TOL), stress tolerance index (STI) and stress susceptibility index (SSI), indicating importance of additive and non-additive genetic effects for them. Non significant ratio of GCA to SCA mean square and low narrow-sense heritability estimates were detected for all the indices, indicating the prime importance of non-additive genetic effects. Significant positive GCA effect of Yp, Ys, MP, GMP and STI for PF7045/91 and significant negative GCA effects of them for Option500, indicated the same direction of GCA effects of these indices and GCA effects of Yp and Ys. On compare to SCA effects, most of crosses had significant high parent heterosis for Yp, Ys and and all the stress indices, therefore selection the better combinations based on heterosis will be more effective than SCA effect.
    Źródło:
    Plant Breeding and Seed Science; 2012, 65; 39-50
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic parameters studies on bacterial blight resistance genes introgressed segregating population in Rice
    Autorzy:
    Govintharaj, Ponnaiah
    Tannidi, Shalini
    Manonmani, Swaminathan
    Robin, Sabariappan
    Powiązania:
    https://bibliotekanauki.pl/articles/1192850.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Genetic parameters
    Rice bacterial blight
    Rice blast
    Yield components
    Opis:
    An exploratory research was conducted to know genetic parameters and agronomical performance of three bacterial blight resistance genes introgressed segregating population of CB 174 R × IRBB 60, CB 87 R × IRBB 60 and TNAU CMS 2B × IRBB 60 in rice. Higher range of genotypic and phenotypic coefficient of variation (GCV and PCV) was found in CB 87 R × IRBB 60 for the trait of number of grains and leads to develop/selection superior genotypes significantly. For single plant yield, CB 174 R × IRBB 60 cross showed high heritability (83.89%) and (27.45%) genetic advance (%) suggesting that traits were primarily controlled by additive gene action and thus, leads to easy selection. Whereas, estimate of moderate heritability (56.09%) with high genetic advance (24.66%) was found in the cross of CB 87 R × IRBB 60 indicating that postponement of selection and for the cross of TNAU CMS 2B × IRBB 60 showed higher heritability with moderate level of genetic advance (67.36% and 11.84%), revealed that single plant yield was preponderantly governed by both additive and non-additive gene effects and selection may be rewarded.
    Źródło:
    World Scientific News; 2016, 59; 85-96
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic Studies of Wood Structure Using an Optical Fibre Analyser
    Badania genetyczne struktury drewna z wykorzystaniem optycznego analizatora włókien
    Autorzy:
    Klisz, M
    Wojda, T
    Powiązania:
    https://bibliotekanauki.pl/articles/232964.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    optical analyzer
    fibre length
    genetic parameters
    wood quality of European larch
    produkcja papieru
    wymiary włókien
    parametry genetyczne
    jakość drewna
    Opis:
    An automatic fibre size analyser - KajaaniFiberLab was used in studies designed to examine and analyse the genetic basis of fibre size variability. Fast and accurate measurement in accordance with the standards may, however, give incorrect results due to errors associated with the multi-staged maceration of wood samples to obtain disintegrated fibre water suspension. Errors in fibre size estimation may occur throughout studies of the increment cores of living trees. Nevertheless the results obtained from the Kajaani analyser allow for the estimation of fibre sizes (length, width and cell wall thickness) with a precision comparable to that in studies using traditional measurement techniques, which is why these results may be used to estimate genetic parameters of the traits mentioned - heritability and genetic correlation. Such parameters are applied when making decisions concerning the management of forest stands and plantations of fast-growing trees. On the basis of the results of measurements of the biometric parameters of fibres, we obtained high values of genetic parameters (heritability and genetic correlations) for the traits of the European larch analysed. Those results allow for the achievement, with a high level of probability,of the breeding objective through selection directed at the improvement of the properties of timber produced in plantations of fast-growing trees.
    Wymiary włókien, są obok zawartości celulozy, lignin i hemicelulozy, jedną z najważniejszych cech drewna przetwarzanego w procesie produkcji papieru. Analizator KajaaniFiberLab 1.3, obok klasycznych badań właściwości papieru, umożliwia przeprowadzenie analiz pod kontem genetycznych uwarunkowań zmienności właściwości drewna istotnych dla produkcji przemysłowej papieru analizator wykorzystuje spolaryzowane światło laserowe do obrazowania włókien za pomocą wysokiej rozdzielczości kamery CCD. Cyfrowa technika obrazowania pozwala przeprowadzić pomiary wymiarów elementów anatomicznych drewna. Zastosowanie tej metodyki umożliwia dokonywanie pomiarów w czasie przepływu zawiesiny włókien przez kapilarne rurki analizatora. Podczas badań zmienności struktury drewna modrzewia europejskiego, określono genetyczne podłoże kształtowania się wymiarów włókien. Określono kluczowe parametry genetyczne dla długości i szerokości włókien, jak również grubości ściany komórkowej włókien.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2014, 4 (106); 117-120
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ligament-based spine-segment mechanisms
    Autorzy:
    Ciszkiewicz, A.
    Milewski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/202123.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    intervertebral joint
    optimization
    parameters estimation
    genetic algorithm
    elastostatic analysis
    staw międzykręgowy
    optymalizacja
    szacowanie parametrów
    algorytm genetyczny
    analiza elastostatyczna
    Opis:
    Nowadays, a growing interest in spine-segment mechanisms for humanoid robots can be observed. The ones currently available are mostly inspired by an intervertebral joint but rarely use its structure and behaviour as input data. The aim of this study was to propose and verify an approach to spine-segment mechanisms synthesis, in which the mechanisms were obtained directly from a ligament system of the intervertebral joint through numerical optimization. The approach consists of two independent optimization procedures performed with genetic algorithm. The first one searches for the optimal structure, while the second estimates its geometrical and stiffness parameters. The mechanisms are rated by their ability to reproduce the static behaviour of the joint in selected aspects. Both procedures use the lumbar L4-L5 intervertebral joint reference data. The approach was tested in two numerical scenarios. It was possible to obtain a mechanism with 7 flexible linear legs that accurately emulated the elastostatic behaviour of the intervertebral joint under moment loads. The results prove that the proposed method is feasible and worth exploring. It may be employed in design of bioinspired joints for use in humanoid robots and can also serve as an initial step in the design of prosthetic and orthotic devices for a human spine.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 705-712
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda identyfikacji parametrów dynamicznych jednostek wytwórczych na podstawie przebiegów pozakłóceniowych
    A method of determining generating units dynamic parameters based on dynamic response during disturbances
    Autorzy:
    Bajor, M.
    Kosmecki, M.
    Wilk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/267047.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    algorytm genetyczny
    ekwiwalentowanie
    identyfikacja parametrów dynamicznych
    genetic algorithm
    dynamic equivalent
    dynamic parameters identification
    Opis:
    W artykule zaproponowano wykorzystanie algorytmu genetycznego do identyfikacji parametrów dynamicznych jednostek wytwórczych lub ekwiwalentów zastępujących obszary systemu elektroenergetycznego w oparciu o przebiegi pozakłóceniowe. W artykule zamieszczono również wyniki dwóch rodzajów testów oprogramowania stworzonego na podstawie opracowanej metody. Testy zostały wykonane poprzez dobór parametrów pojedynczej jednostki wytwórczej oraz dla jednostki zastępczej mającej za zadanie odwzorowanie zachowania dynamicznego większego obszaru systemu.
    In large, modern electroenergetic systems there is often a lack of full information about structures and parameters of dynamic models of generating units. Thus it is important to be able to identify them basing on their dynamic response recorded after disturbances. Having knowledge on identifying those parameters will also enable to efficiently create dynamic equivalents which can be used for substituting whole areas of the system. In the paper, a method based on an implementation of genetic algorithm is proposed to identify parameters of the dynamic model basing on the analysis of disturbance response. The method is tested by identifying parameters of the single generating unit (for which measurements were known) and then by identifying parameters of the equivalence unit, that is used to replace a certain area of the system.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2013, 32; 71-74
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of tailing dam with calibration based on genetic algorithm and geotechnical monitoring data
    Autorzy:
    Grosel, Szczepan
    Powiązania:
    https://bibliotekanauki.pl/articles/1845160.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    soil parameters
    optimization
    slope stability
    genetic algorithm
    observational method
    monitoring
    Opis:
    The article presents a method of calibration of material parameters of a numerical model based on a genetic algorithm, which allows to match the calculation results with measurements from the geotechnical monitoring network. This method can be used for the maintenance of objects managed by the observation method, which requires continuous monitoring and design alterations. The correctness of the calibration method has been verified on the basis of artificially generated data in order to eliminate inaccuracies related to approximations resulting from the numerical model generation. Using the example of the tailing dam model the quality of prediction of the selected measurement points was verified. Moreover, changes of factor of safety values, which is an important indicator for designing this type of construction, were analyzed. It was decided to exploit the case of dam of reservoir, which is under continuous construction, that is dam height is increasing constantly, because in this situation the use of the observation method is relevant.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, 1; 34-47
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parameters identification of the flexible fin kinematics model using vision and Genetic Algorithms
    Autorzy:
    Jurczyk, Karolina
    Piskur, Paweł
    Szymak, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/259505.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Biomimetic Underwater Vehicle
    flexible fin kinematics model
    parameters identification using vision
    Genetic Algorithm
    Opis:
    Recently a new type of autonomous underwater vehicle uses artificial fins to imitate the movements of marine animals, e.g. fish. These vehicles are biomimetic and their driving system is an undulating propulsion. There are two main methods of reproducing undulating motion. The first method uses a flexible tail fin, which is connected to a rigid hull by a movable axis. The second method is based on the synchronised operation of several mechanical joints to imitate the tail movement that can be observed among real marine animals such as fish. This paper will examine the first method of reproducing tail fin movement. The goal of the research presented in the paper is to identify the parameters of the one-piece flexible fin kinematics model. The model needs further analysis, e.g. using it with Computational Fluid Dynamics (CFD) in order to select the most suitable prototype for a Biomimetic Underwater Vehicle (BUV). The background of the work is explained in the first section of the paper and the kinematic model for the flexible fin is described in the next section. The following section is entitled Materials and Methods, and includes a description of a laboratory test of a water tunnel, a description of a Vision Algorithm (VA)which was used to determine the positions of the fin, and a Genetic Algorithm (GA) which was used to find the parameters of the kinematic fin. In the next section, the results of the research are presented and discussed. At the end of the paper, the summary including main conclusions and a schedule of the future research is inserted.
    Źródło:
    Polish Maritime Research; 2020, 2; 39-47
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wielocechowa ocena potomstwa populacji buka zwyczajnego (Fagus sylvatica L.) z południowo-wschodniej Polski w początkowych latach wzrostu
    Multivariable evaluation of the early growth performance of European beech (Fagus sylvatica L.) provenances from south-eastern Poland
    Autorzy:
    Buraczyk, W.
    Szeligowski, H.
    Studnicki, M.
    Drozdowski, S.
    Bielak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/989437.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    hodowla lasu
    drzewa lesne
    buk zwyczajny
    Fagus sylvatica
    proweniencje
    drzewa potomne
    przezywalnosc
    wzrost roslin
    cechy fenologiczne
    jakosc hodowlana
    doswiadczenia proweniencyjne
    Nadlesnictwo Losie
    genetic variability
    growth parameters
    morphological traits
    phenology
    progeny testing
    Opis:
    European beech is one of the most important broadleaved tree species in Poland and will play probably even more significant role in the future due to the predicted climate change. The main objectives of this study was to analyse and compare the growth parameters and morphological traits between 23 European beech provenances from south−eastern Poland (fig. 1). The research was conducted on the experimental plot established in Łosie Forest District in 2006. The experiment employed a randomized complete block design consisting of 92 plots (23 provenances×4 blocks). On each plot 100 trees representing given provenance were planted in 1.5×1.5 m spacing. In the spring and autumn 2015 we measured and determined the following parameters for the subsample of 36 trees on each plot: survival rate, tree height, diameter at breast height, diameter of the branch at the middle height of the crown length, stem straightness, crown shape, tendency to create forks, mean angle between stem and branches and spring phenology. We also included different eco−physiographical characteristics for each provenances (tab. 1). We performed basic statistics to describe mean values and standard errors (fig. 2, tab. 2) and finally we quantified the interaction between traits and eco−physiographical characteristics by Principal Component Analysis (PCA) (fig 3, tab. 3). The obtained results indicates that under growth conditions on experimental trial in Łosie Forest District, the provenances from lower elevated regions with lower precipitation and higher mean temperature (i.e. more arid conditions; Kielce and Narol provenances) were characterized by thicker dbh and branch dimeters in contrast to regions from southern Poland (Łosie, Bricza 1, Stary Sącz and Nawojowa). European beech provenances from regions with more humid conditions and lower mean annual temperature, as well as shorter vegetation season are characterized by higher survival rate. They are also higher than other provenances, but reveal the lower ratio dbh to branch diameter.
    Źródło:
    Sylwan; 2016, 160, 12; 981-992
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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