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Wyświetlanie 1-7 z 7
Tytuł:
New approach to trophic state assessment of running waters in Poland
Autorzy:
Neverova-Dziopak, E.
Kowalewski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/108528.pdf
Data publikacji:
2013
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
eutrophication
biotic balance
trophic state assessment
integral criterion
Opis:
The problem of eutrophication has, since the 1970s, reached a global scale and become a problem of principal importance due to its negative consequences, which could result in the total loss of biospheric functions of aquatic ecosystems, and also their economic role. The increasing intensity of eutrophication processes and their specificity in various types of waters requires the development of special methods of control and protection of aquatic ecosystems. As a result of the high dynamism of eutrophication and its dependence on different factors (hydrological, hydrodynamic, hydrobiological, morphological, edaphic and climatic conditions), the assessment of trophic status in order to control and manage this process is very complicated. The evaluation of the consequences of anthropogenic eutrophication and the scale of its development can be provided only on the basis of systematic observation during a multi-annual period. Careful analysis of the state of knowledge on the issues related to eutrophication, especially the methods of trophic status assessment, have allowed us to conclude that at present there is no universal methodology for the assessment of the surface water trophic level, while the existing methods have various shortcomings, which reduce the reliability of the results and complicate the development of appropriate technical, organizational and legal protection measures. A critical analysis of trophic status assessment approaches for different categories of waters has also allowed us to state that there is no an appropriate method for the assessment of the trophic status of running waters, since almost all existing assessment methods are developed for lakes and coastal areas. This paper presents an original approach elaborated for the assessment of the trophic state of running waters based on the statistical analysis of long-term monitoring data and numerical criterion ITS, which allows for a simple and low-cost monitoring of eutrophication suitable for the solving of different application tasks in the field of surface water protection.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2013, 1, 1; 15-21
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane wskaźniki jakości sterowania i ich wpływ na średnie podciśnienie w rurociągu mlecznym i jego amplitudę wahań w dojarce rurociągowej
Selected indexes of control indexes and their influence on average negative pressure in a milk pipeline and its amplitude of variations in a pipeline milking unit
Autorzy:
Skalska, D.
Powiązania:
https://bibliotekanauki.pl/articles/289150.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
rurociąg mleczny
zakłócenie
kryterium całkowe
wahanie podciśnienia
milk pipeline
interference
integral criterion
negative pressure variations
Opis:
Analizowano wpływ sygnałów testowych opisanych wskaźnikami jakości sterowania; maksymalnym spadkiem podciśnienia Pmax, polem powierzchni S1 (Sc) pod krzywą zmian podciśnienia w czasie trwania zakłócenia na zmiany wahań podciśnienia w rurociągu mlecznym aP14 i na zmiany średniego podciśnienia P14 w rurociągu mlecznym w pierwszym cyklu pulsacji, w trzech następnych cyklach pulsacji po wprowadzeniu zakłócenia. Pomiary wykonano dla określonej liczby równocześnie pracujących aparatów udojowych (od 1 do 6). Wykazano, że P14 w rurociągu mlecznym oraz aP14 istotnie zależą (liniowo) od zmian pola powierzchni S1 (Sc) pod krzywą opisującą ww. zakłócenia w pierwszym cyklu pulsacji (dla fazy 1 po) i w następnych trzech cyklach (dla fazy 2-4 po) po wprowadzeniu powietrza do instalacji dojarki rurociągowej.
Influence of test signals described by the quality control indexes was analysed: maximum decrease of the negative pressure Pmax, surface area S1 (Sc) beneath the curve of the negative pressure fluctuations during interference on negative pressure variation fluctuations in a milk pipeline aP14 and on the changes of average negative pressure P14 in a milk pipeline in the first cycle of pulsation, in three subsequent cycles of pulsation after introducing interference. The measures were taken for a particular number of milking units working simultaneously (from 1 to 6). It was proved that P14 in a milk pipeline and aP14 considerably depend (linearly) on the changes of surface area S1 (Sc) beneath the curve describing the abovementioned interferences in the first cycle of pulsation (for 1 po phase) and in the subsequent three cycles (for 2-4 po phase) after introducing air to a milking pipeline unit.
Źródło:
Inżynieria Rolnicza; 2011, R. 15, nr 8, 8; 245-252
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An extension of the univalence criterion for a family of integral operators
Autorzy:
Deniz, Erhan
Orhan, Halit
Powiązania:
https://bibliotekanauki.pl/articles/747246.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Integral operator
analytic functions
univalent functions
open unit disk
univalence criterion
Opis:
The main object of the present paper is to extend the univalence condition for a family of integral operators. Relevant connections of some of the results obtained in this paper with those in earlier works are also provided.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2010, 54, 2
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth control of cracks under contact conditions based on the topological derivative of the Rice’s integral
Autorzy:
da Silva Xavier, Marcel Duarte
Novotny, Antonio André
Sokołowski, Jan
Powiązania:
https://bibliotekanauki.pl/articles/1839141.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Rice’s integral
Griffith’s criterion
Eshelby’s tensor
topological derivative
Opis:
In the present paper we propose a simple method for dealing with growth control of cracks under contact type boundary conditions on their lips. The aim is to find a mechanism for decreasing the energy release rate of cracked components, which means increasing their fracture toughness. The method consists in minimizing a shape functional defined in terms of the Rice’s integral, with respect to the nucleation of hard and/or soft inclusions, according to the information provided by the associated topological derivative. Based on Griffith’s energy criterion, this simple strategy allows for an increase in fracture toughness of the cracked component. Since the problem is non-linear, the domain decomposition technique, combined with the Steklov-Poincaré pseudo-differential boundary operator, is used to obtain the sensitivity of the associated shape functional with respect to the nucleation of a small circular inclusion with different material property from the background. Then, the obtained topological derivatives are used to indicate the regions, where the controls should be positioned in order to solve the minimization problem we are dealing with. Finally, a numerical example is presented showing the applicability of the proposed methodology.
Źródło:
Control and Cybernetics; 2019, 48, 2; 307-323
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the deformation fracture criterion to cracking of disc specimens with a central narrow slot
Autorzy:
Kazberuk, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2204693.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
cracked Brazilian disc
Dugdale model
plastic strip
fracture deformation criterion
singular integral equations
Opis:
Using the method of singular integral equations, the elastic-plastic problem for cracked Brazilian disk was solved. Based on the Dugdale model and deformation fracture criterion, the relationships between critical load, notch tip opening displacement and length of the plastic strips were established. Also, the comparison between the present solution for the finite domain and the known solution obtained for the semi-infinite notch in the elastic plane was performed.
Źródło:
Acta Mechanica et Automatica; 2022, 16, 4; 393--398
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method for assessing the urban land investment attractiveness
Autorzy:
Mamonov, Kostiantyn
Nesterenko, Serhii
Radzinskaya, Yuliia
Palamar, Alena
Powiązania:
https://bibliotekanauki.pl/articles/145599.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
atrakcyjność inwestycyjna
wycena
grunty miejskie
investment attractiveness
integral assessment
urban land
normative monetary valuation
investment criterion
Opis:
In modern conditions of urban development, there is a need to improve the technology for determining the investment attractiveness of urban lands by developing a method and models for assessing its impact, which will be based on the construction of a two-level system of indicators, which will determine the integral investment criterion and develop guidelines for improving the investment attractiveness of urban lands. As a result of the research, the value of the integral indicator of urban land investment attractiveness was determined, which allowed to apply it in the system of normative monetary valuation of urban land and to develop methodological recommendations for improving the efficiency of its investment attractiveness assessment. A method for assessing the investment attractiveness of urban land, as the main element of technology, based on the determination of indicators for assessing the integral criterion for the development of guidelines for improving the urban land investment attractiveness is developed. By the value of the integral criterion, the integral indicators of the potential investment attractiveness of urban lands are determined, considering the changes in the normative monetary value of the lands of settlements and the level of investment attractiveness of the regional centers of Ukraine is determined.
Źródło:
Geodesy and Cartography; 2019, 68, 2; 321-328
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of decoupled pi controllers for two-input two-output networked control systems with intrinsic and network-induced time delays
Autorzy:
Mohamed-Vall, Ould Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/2106237.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
proportional integral controller
two-input two-output systems
TITO
networked control systems
stability region boundary locus
Wood–Berry distillation column model
time delay
Mikhailov criterion
Opis:
Proportional integral controller design for two-input two-output (TITO) networked control systems (NCSs) with intrinsic and network-induced time delays is studied in this paper. The TITO NCS consists of two delayed sub-systems coupled in a 1-1/2-2 pairing mode. In order to simplify the controller design, a decoupling method is first applied to obtain a decoupled system. Then, the controllers are designed based on the transfer function matrix of the obtained decoupled system and using the boundary locus method for determining the stability region and the well-known Mikhailov criterion for the stability test. A comparative analysis of the designed controllers and other controllers proposed in previous literature works is thereafter carried out. To demonstrate the validity and efficacy of the proposed method and to show that it achieves better results than other methods proposed in earlier literature works, the implementation in simulation of Wood–Berry distillation column model (methanol–water separation), a well-known benchmark for TITO systems, is carried out.
Źródło:
Acta Mechanica et Automatica; 2021, 15, 4; 201--208
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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