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Wyświetlanie 1-15 z 96
Tytuł:
Solving Delivery Problems in Distribution Systems
Autorzy:
Michlowicz, Edward
Powiązania:
https://bibliotekanauki.pl/articles/504345.pdf
Data publikacji:
2013
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
optimization
transport tasks
delivery problems
Opis:
The subject matter of this article is the optimization of delivery problems (Vehicle Routing Problems – VRP) with regard to distribution systems. These issues belong to the class of NP-hard problems. Current solutions to various delivery problems (VRP, TSP, MTSP, VRPTW, RDPTW) were analysed. Two examples were presented. In a transport and production task, a marginal cost equalling (MCE) algorithm was used. In the case of a Multi Depot Vehicle Routing Problem (MDVRP), an evolutionary algorithm was used.
Źródło:
Logistics and Transport; 2013, 18, 2; 33-40
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust microgrids for distribution systems with high solar photovoltaic penetration
Autorzy:
Sampath, Ediriweera W.E.P.
Lidula, N.W.A.
Herath, H. Dayan B.P.
Powiązania:
https://bibliotekanauki.pl/articles/27309941.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
converter
dynamic system
robustness
stability
synchronous generators
Opis:
A microgrid is an appropriate concept for urban areas with high penetration of renewable power generation, which improves the reliability and efficiency of the distribution network at the consumer premises to meet various loads such as domestic, industrial, and agricultural types. Microgrids comprising inverter-based and synchronous generator-based distribution generators can lead to the instability of the system during the islanded mode of operation. This paper presents a study on designing stable microgrids to facilitate higher penetration of solar power generation into a distribution network. A generalized small signal model is derived for a microgrid with static loads, dynamic loads, energy storages, solar photovoltaic (PV) systems, and diesel generators, incorporating the features of dynamic systems. The model is validated by comparing the transient curves given by the model and a transient simulator subjected to step changes. The result shows that full dynamic models of complex systems of microgrids can be built accurately, and the proposed microgrid is stable for all the considered loading situations and solar PV penetration levels according to the small signal stability analysis.
Źródło:
Archives of Electrical Engineering; 2023, 72, 3; 785--809
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FISH method for identification of microbes in wastewater distribution systems
Autorzy:
Domańska, M.
Kuhn, R.
Łomotowski, J.
Stańczyk, E.
Powiązania:
https://bibliotekanauki.pl/articles/207711.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bacteria
bioreactors
fluorescence microscopy
microorganisms
FISH method
fluorescence in situ hybridization
membrane bioreactor
bakteria
bioreaktory
mikroskopia fluorescencyjna
mikroorganizmy
metoda FISH
fluorescencyjna hybrydyzacja in situ
bioreaktor membranowy
Opis:
The fluorescence in situ hybridization (FISH) method is widely used to identify various types of cells. In comparison to cultivation dependent methods, identification of microbes by FISH is easier and generally takes several hours. A review of improvements to the FISH method has been presented, its advantages and disadvantages, as well as examples of application. Particular consideration was given to the efficiency of identification of microbes in samples taken from sewerage. The effectiveness of the method was confirmed by the results obtained in samples from the membrane bioreactor.
Źródło:
Environment Protection Engineering; 2014, 40, 3; 151-160
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Content Quality Evaluation within 3DTV Service Distribution Systems
Autorzy:
Wilczewski, G.
Powiązania:
https://bibliotekanauki.pl/articles/307913.pdf
Data publikacji:
2014
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
3D content perception
quality assessment
service creation
stereoscopic imagery
Opis:
In the following paper, evaluation of quality of con- tent distributed within 3DTV service is assessed. The performed analysis reveals a multiplicity of parameters as a compound factor defining the contemporary approach towards quality assessment. Taking into consideration a successful telecommunication service creation, an examination of content chain identifies crucial stages founding the path of modern services of stereoscopic content distribution quality evaluation.
Źródło:
Journal of Telecommunications and Information Technology; 2014, 1; 16-20
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal load distribution estimation for fault location in electric power distribution systems
Autorzy:
Menchafou, Y.
Zahri, M.
Habibi, M.
El Markhi, H.
Powiązania:
https://bibliotekanauki.pl/articles/140980.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electric power distribution systems
fault location
fictive load distribution
load variation
Opis:
Accurate fault location in an electric power distribution system (EPDS) is important in maintaining system reliability. Diverse methods have been proposed in the past. These methods whither require measurements at each load point or use single-step loads compensation, which is hardly available in practical uses. In this paper, a simple technique to bypass the load problems is proposed. The method requires calculating an optimal load distribution using the total load seen from the substation (The rated power of distribution transformers) and the network topology. The optimal load distribution is used as a fictive distribution to replace the real unknown one in fault location (FL) algorithms. The effectiveness of the proposed technique is demonstrated using a mathematical formulation first, and next, by several simulations with a classic iterative fault location algorithm. The test results are obtained from the numerical simulation using the data of a distribution line recognized in the literature.
Źródło:
Archives of Electrical Engineering; 2017, 66, 1; 77-87
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of chlorine concentration in drinking water distribution systems using an interval estimator
Autorzy:
Łangowski, R.
Brdyś, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/929615.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
estymator
jakość wody
metoda ograniczająca
modelowanie dynamiczne
estimators
bounding methods
modelling dynamics
water quality
Opis:
This paper describes the design of an interval observer for the estimation of unmeasured quality state variables in drinking water distribution systems. The estimator utilizes a set bounded model of uncertainty to produce robust interval bounds on the estimated state variables of the water quality. The bounds are generated by solving two differential equations. Hence the numerical efficiency is sufficient for on-line monitoring of the water quality. The observer is applied to an exemplary water network and its performance is validated by simulations.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2007, 17, 2; 199-216
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing control by robustly feasible model predictive control and application to drinkingwater distribution systems
Autorzy:
Tran, V. N.
Brdys, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/91723.pdf
Data publikacji:
2011
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
optimizing
model predictive control
MPC
Robustly Feasible MPC
RFMPC
Drinking
Water Distribution Systems
DWDS
genetic algorithm
Opis:
The paper considers optimizing Model Predictive Control (MPC) for nonlinear plants with output constraints under uncertainties. Although the MPC technology can handle the constraints in the model by solving constraint model based optimization task, satisfying the plant output constraints under the model uncertainty still remains a challenge. The paper proposes Robustly Feasible MPC (RFMPC), which achieves feasibility of the outputs in the controlled plant. The RFMPC which is applied to control quantity in Drinking Water Distribution Systems (DWDS) is illustrated by application to the DWDS example. In the simulation exercise, Genetic Algorithm is selected as the optimization solver and the reduced search space methodology is applied in the implementation under MATLABEPANET environment.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2011, 1, 1; 43-57
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biological stability of water in water distribution systems. The effect of water treatment trials
Autorzy:
Wolska, M.
Powiązania:
https://bibliotekanauki.pl/articles/206902.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
water treatment
carbon
groundwater
microorganisms
nitrogen removal
organic carbon
surface waters
water aeration
water distribution systems
water supply systems
biological stability
inorganic nitrogen
uzdatnianie wody
węgiel
wody gruntowe
mikroorganizmy
usuwanie azotu
węgiel organiczny
wody powierzchniowe
napowietrzanie wody
systemy dystrybucji wody
wodociągi
stabilność biologiczna
stężenie dwutlenku węgla
azot nieorganiczny
Opis:
Research into the removal efficiency of biogenic substances, necessary for the growth of heterotrophic microorganisms, was carried out for the following water treatment trials: surface water, infiltrative water and mixed surface water after microsieving with aerated underground water. The results have shown that the efficiency of removal of organic substances, independently of the type of treated water, increased along with the organic carbon concentrations in raw water. The average effectiveness of phosphate removal was: 92.1%, 88.8% and 83.7% for surface, infiltrative and mixed water, respectively. In all analyzed systems, presence of phosphates was an limiting factor for the regrowth of microorganisms in the distribution system. In none of the water treatment trials, effective removal of inorganic nitrogen has been recorded.
Źródło:
Environment Protection Engineering; 2015, 41, 2; 147-157
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Traceability of gas flow measurements in complex distribution systems - uncertainty approach vs error approach
Autorzy:
Džemić, Zijad
Širok, Brane
Drnovšek, Janko
Powiązania:
https://bibliotekanauki.pl/articles/220509.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
calibration
energy efficiency
error analyses
measurement uncertainty
traceability
Opis:
The objective of the paper is to analyse traceability issues in real-life gas flow measurements in complex distribution systems. The initial aim is to provide complete and traceable measurement results and calibration certificates of gas-flow meters, which correspond to specific installation conditions. Extensive work has been done to enable a more credible decision on how to deal in particular situations with the measurement uncertainty which is always subject of a flow meter’s calibration as a quantitative parameter value obtained in laboratory, and with the qualitative statement about the error of an outdoor meter. The laboratory simulation of a complex, real-life distributed system has been designed to achieve the initial aim. As an extension of standardized procedures that refer to the laboratory conditions, the proposed methods introduce additional “installation-specific” error sources. These sources could be either corrected (if identified) or considered as an additional “installation-specific” uncertainty contribution otherwise. The analysis and the results of the experimental work will contribute to more precise and accurate measurement results, thus assuring proper measurements with a known/estimated uncertainty for a specific gas flow installation. Also, the analysis will improve the existing normative documents by here presented findings, as well as fair trade in one of the most important and growing energy consumption areas regarding the legal metrology aspects. These facts will enable comparing the entire quantity of gas at the input of a complex distributed system with the cumulative sum of all individual gas meters in a specific installation.
Źródło:
Metrology and Measurement Systems; 2019, 26, 2; 419-429
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Application of Simulation Methods in the Comparative Analysis of Car Spare Parts Distribution Systems
Autorzy:
Grzybowska, Katarzyna
Kostrzewski, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/503656.pdf
Data publikacji:
2016
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
Car spare parts
simulation models
distribution systems
Opis:
Car spare parts are omnipresent in the modern world. They play a major role in business, maintenance and repairs. Car spare parts must be frequently provided in after-sales service. Customers of spare parts have great expectations in terms of their delivery and availability. Most important are short-term orders realisation and flexible services. The main aim of the paper is to consider two different distribution systems that occur at one entrepreneur’s. The reason of this consideration is to identify which of the distribution systems is more effective regarding the order completion time and more effective regarding the level of customer service. In case of realising these aims, the simulation models analyses are proposed.
Źródło:
Logistics and Transport; 2016, 32, 4; 5-16
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of various control techniques for motor-pump sets applied in selected water distribution systems
Autorzy:
Popenda, A.
Powiązania:
https://bibliotekanauki.pl/articles/1372738.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
elektrociepłownia
system dystrybucji wody
pompa
thermal-electric power station
water distribution system
pump
Opis:
The water distribution system applied in the thermal-electric power station EC Tychy SA is analyzed. The economical aspects of various control techniques for motor-pump sets in the aforementioned system are presented in the paper on the example of pumps working out of the cold season. The reasons of control losses occurring in the present system are depicted. The way of improvement of control effectiveness is proposed but unprofitability of the investment is also shown. A control of pumps by throttling and control by rotational speed changes are compared in the paper. It is shown that control by rotational speed changes causes similar losses like control by throttling if application of variable-speed technique is not preceded by appropriate adaptation of water distribution system, especially by adjustment of pump rated parameters.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2011, 4, 92; 97-101
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of temperature, chlorine residual and heavy metals on the presence of Legionella pneumophila in hot water distribution systems
Autorzy:
Rakic, A.
Peric, J.
Foglar, L.
Powiązania:
https://bibliotekanauki.pl/articles/52228.pdf
Data publikacji:
2012
Wydawca:
Instytut Medycyny Wsi
Opis:
The microbiological colonisation of buildings and man-made structures often occurs on the walls of plumbing systems; therefore, monitoring of opportunistic pathogens such as Legionella pneumophila (L. pneumophila), both in water distribution mains and in consumers’ plumbing systems, is an important issue according to the international and national guidelines that regulate the quality of drinking water. This paper investigates the presence of L. pneumophila in the Dalmatian County of Croatia and the relationship between L. pneumophila presence and heavy metals concentrations, free residual chlorine and water temperature in hot water distribution systems (WDS). Investigations were performed on a large number of hot water samples taken from taps in kitchens and bathrooms in hotels and homes for the elderly and disabled in the Split region. Of the 127 hot water samples examined, 12 (9.4%) were positive for Legionella spp. with median values concentration of 450 cfu × L-1. Among positive isolates, 10 (83.3%) were L. pneumophila sg 1, and two of them (16.6%) belonged to the genera L. pneumophila sg 2–14. The positive correlation between the water temperature, iron and manganese concentrations, and L. pneumophila contamination was proved by statistical analysis of the experimental data. On the contrary, zinc and free residual chlorine had no observed influence on the presence of L. pneumophila. The presence of heavy metals in water samples confirms the corrosion of distribution system pipes and fittings, and suggests that metal plumbing components and associated corrosion products are important factors in the survival and growth of L. pneumophila in WDS.
Źródło:
Annals of Agricultural and Environmental Medicine; 2012, 19, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation Tools for Analysis and Design of Distribution Networks with Distributed Energy Resources
Autorzy:
Martinez-Velasco, J. A.
de Leon, F.
Dinavahi, V.
Powiązania:
https://bibliotekanauki.pl/articles/262787.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
distribution systems
distributed energy resources
distributed generation
simulation
Opis:
Distributed energy resources (DER) are a combination of distributed generation, energy storage and demand-side measures. DER can be used to help utilities solve problems on the distribution system by supporting voltage, reducing losses, providing backup power, improving local power quality7 and reliability, or deferring distribution system upgrade. They present, however, some important drawbacks such as new protection coordination problems, complicated operating procedures, or intermittent nature of renewable sources. All these issues complicate the analysis of distribution systems with a high penetration of DER devices. Required simulation tools must therefore combine analysis and modelling capabilities for representing the various DER technologies accurately. Since distribution systems were not designed for the inclusion of DER, most distribution software packages were not designed for the analysis of systems with embedded generation either. Present software designed for the study of distribution systems can efficiently cope with unbalanced load-flow and short circuit calculations, load growth studies, or system restoration and contingency analysis. However, they do not deal with transient stability and small signal stability because traditionally there was no generation at distribution level. This situation is changing, software manufacturers are updating and expanding tool capabilities to take into account the new simulation challenges, and new and specialized tools have been developed to cope with problems related to the installation of DER devices. This paper is aimed at reviewing the present status and the future trends of simulation tools for analysis and planning of distribution systems with penetration of DER, including market-oriented analysis and real-time simulation.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2009, 15, 1; 33-50
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prevalence of Legionella pneumophila in water distribution systems in hospitals and public buildings of the Lublin region of eastern Poland
Autorzy:
Sikora, A.
Wojtowicz-Bobin, M.
Koziol-Montewka, M.
Magrys, A.
Gladysz, I.
Powiązania:
https://bibliotekanauki.pl/articles/49381.pdf
Data publikacji:
2015
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2015, 22, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An interval estimator for chlorine monitoring in drinking water distribution systems under uncertain system dynamics, inputs and chlorine concentration measurement errors
Autorzy:
Łangowski, R.
Brdys, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/330246.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
observer
bounding method
modelling dynamics
water quality
obserwator
dynamika modelowania
jakość wody
Opis:
The design of an interval observer for estimation of unmeasured state variables with application to drinking water distribution systems is described. In particular, the design process of such an observer is considered for estimation of the water quality described by the concentration of free chlorine. The interval observer is derived to produce the robust interval bounds on the estimated water quality state variables. The stability and robustness of the interval observer are investigated under uncertainty in system dynamics, inputs, initial conditions and measurement errors. The bounds on the estimated variables are generated by solving two systems of first-order ordinary differential equations. For that reason, despite a large scale of the systems, the numerical efficiency is sufficient for the on-line monitoring of the water quality. Finally, in order to validate the performance of the observer, it is applied to the model of a real water distribution network.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2017, 27, 2; 309-322
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 96

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