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Wyświetlanie 1-15 z 36
Tytuł:
Optimizing the operation of a photovoltaic generator by a genetically tuned fuzzy controller
Autorzy:
Drir, N
Barazane, L.
Loudini, M.
Powiązania:
https://bibliotekanauki.pl/articles/229250.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
maximum power point tracking (PPT)
P&O
styling
fuzzy control
genetic algorithms
Opis:
This paper presents design and application of advanced control scheme which integrates fuzzy logic concepts and genetic algorithms to track the maximum power point in photovoltaic system. The parameters of adopted fuzzy logic controller are optimized using genetic algorithm with innovative tuning procedures. The synthesized genetic algorithm which optimizes fuzzy logic controller is implemented and tested to achieve a precise control of the maximum power point response of the photovoltaic generator. The performance of the adopted control strategy is examined through a series of simulation experiments which prove good tracking properties and fast response to changes of different meteorological conditions such as isolation or temperature.
Źródło:
Archives of Control Sciences; 2013, 23, 2; 145-167
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of maximum power point tracking methods for photovoltaic systems
Autorzy:
Talha, A.
Boumaaraf, H.
Bouhali, O.
Powiązania:
https://bibliotekanauki.pl/articles/229456.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
maximum power point tracking (PPT)
PV
P&O
incremental conductance
fuzzy logic
converter
Opis:
The output characteristics of photovoltaic (PV) arrays are nonlinear and change with the solar irradiance and the cell's temperature. Therefore, a maximum power point tracking (MPPT) technique is needed to draw peak power from the solar array to maximize the produced energy. Among the hill climbing methods, the perturb and observe (P&O) method tracks the maximum power point (MPP) by repeatedly increasing or decreasing the output voltage at the MPP of the PV module. The implementation of the method is relatively simple, but it cannot track the MPP when the irradiance varies quickly with time. In addition, itmay cause system oscillation around the peak power points due to the effect of measurement noise. The incremental conductance (IncCond) method is also often used in PV systems. This method tracks the MPPs by comparing the incremental and instantaneous conductances of the solar array. This method requires longer conversion time, and a large amount of power loss results. In addition, extra hardware circuitry is required to implement the system. In this paper, it is shown that the negative effects associated with such a drawback can be greatly reduced if the intelligent method is used to improve P&O and IncCond algorithms. The perturbation step is continuously approximated by using fuzzy logic controller (FLC). By the digital simulation, the validity of the proposed control algorithm is proved.
Źródło:
Archives of Control Sciences; 2011, 21, 2; 151-165
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ksiądz Idzi Ogierman Mański, salezjanin, muzyk, kompozytor – twórca muzyki religijnej
Autorzy:
Malinowski, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/669105.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Papieski Jana Pawła II w Krakowie
Tematy:
p. I. O. Mański
religious music
ks. I. O. Mański
muzyka religijna
Opis:
50th anniversary of tragic death of father Idzi Mański in Tatry Mountains brings back the memories about this salesian, musician, composer, teacher and mentor. We remember his distinctive, complete personality, musical talent, someone with wide horizons looking at the world from perspective of humanist and priest. On that basis he appears above all as a composer of mostly but not only religious music. His unique charisma of artist – composer amazes and fascinates us being heirs to his talent, nobility, humbleness and transparent humanity. Father Manski’s work is in many ways a phenomenon on the scale of broad spectrum of publicly available artistic work in the area of religious music in Poland. Almost his entire artistic work is in the form of manuscripts, which he would loan, pass on or give them away, and some were lost. Predatory communist system was destructive for the culture. It would not only censure but downright not allow the publication of the work of writers, poets, musicians. Such was the reality that father Manski had to live in. Creative musical work: organ, choral – religious and secular on piano and other instruments belongs to a highly sublime creative work with characteristic workbench presenting ample contrapunctuate harmonics with perfect melodics embedded in harmonic constructions based on mathematical logic, in which we find charm, passion, and wide world of musical beauty.
Tragiczna śmierć w Tatrach ks. Idziego Mańskiego, salezjanina, muzyka, kompozytora, nauczyciela i wychowawcy, po 50 latach znów pobudza naszą pamięć. Odżywa w nas jego pełnowymiarowa osobowość, talent muzyczny, szerokie horyzonty postrzegania tego świata przez niego – jako humanistę i kapłana. Na tym fundamencie jawi się on przede wszystkim jako kompozytor, twórca muzyki religijnej i nie tylko. Ten szczególny charyzmat artysty‑kompozytora zadziwia i fascynuje nas, będących spadkobiercami jego talentu, a zarazem szlachectwa, pokory i przejrzystego człowieczeństwa.Twórczość ks. Mańskiego pod wieloma względami stanowi ewenement w skali szerokiego spektrum ogólnodostępnej twórczości w dziedzinie muzyki religijnej w Polsce. Niemalże cała jego twórczość muzyczna pozostała w rękopisach, które pożyczał, przekazywał, rozdawał i których niestety wiele zaginęło.Drapieżny, niszczący kulturę system komunistyczny nie tylko cenzurował, ale wręcz nie pozwalał na publikowanie twórczości pisarzy, poetów, muzyków. W takiej rzeczywistości przyszło żyć ks. Mańskiemu.Twórczość muzyczna: organowa, chóralna – religijna i świecka, z udziałem fortepianu i innych instrumentów, należy do wysoce wysublimowanej twórczości o charakterystycznym warsztacie muzycznym, prezentującym bogatą harmonikę kontrapunktyczną z doskonałą melodyką osadzoną na konstrukcjach harmonicznych o podłożu matematycznej logiki, w której odnajdujemy urok, pasję i szeroki świat muzycznego piękna.
Źródło:
Pro Musica Sacra; 2017, 15
2083-4039
Pojawia się w:
Pro Musica Sacra
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obtaining the partially acidulated phosphate rocks by means of intermediate-grade phosphate and diluted phosphoric acid: Influence of some parameters
Autorzy:
Mizane, A.
Boumerah, A.
Dadda, N.
Rehamnia, R.
Belhait, S.
Powiązania:
https://bibliotekanauki.pl/articles/780027.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
PAPRs
phosphate rocks
phosphoric acid
water-soluble P2O5
Opis:
In this work, some parameters during the partial acidulation by phosphoric acid of phosphate 53.75% BPL (bone phosphate of lime) having different particle sizes are determined. P2O5 recovery is obtained by performing a series of reactions using phosphoric acid diluted from 10 to 40 wt.% and with reaction times ranging from 10 to 50 minutes. The best conversion rates are obtained with the following reaction parameters: phosphates size: 88-177 μm, reaction time: 50 minutes and phosphoric acid concentration: 40 wt.%. In the second part, the water-soluble P2O5 of PAPRs (Partially Acidulated Phosphate Rocks) obtained with phosphoric acid 30% and 40 wt.% is measured. The results of experiments showed that the water-soluble P2O5 has reached 15.2% for PAPRs obtained by reacting phosphate 88 μm with phosphoric acid 40 wt%.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 3; 39-43
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Standard życia i zamieszkania osób starszych w placówkach opiekuńczych
Standard of living and residence of senior citizens in institutional care
Autorzy:
Bielak, Maria
Powiązania:
https://bibliotekanauki.pl/articles/905126.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
built environment
caring institutions
list of qualitative criteria
qualitative research
P.O.E. (Post-Occupancy Evaluation)
users’ needs
Opis:
The study presents the problem of an appropriate and comprehensive shaping of the living environment of senior citizens in institutional care, i.e. creation of a most accessible built environment for them. The currently prevailing conditions in Polish care institutions for senior citizens are continuously improving, however they do not completely fulfil modern requirements and European standards expected from such institutions. In order for such a facility to provide an appropriate living environment for senior citizens and function efficiently, they cannot be based only on precisely defined guidelines and design principles. They have to be based on knowledge concerning senior citizens, their problems, needs and expectations; they also have to take into account the results of qualitative research based on the principles of universal design and ergonomics.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 297
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of phosphoric acid sludge: effect of flocculation on settling and P2O5 recovery rates
Autorzy:
Jouraiphy, Rim
Anouar, Islaam
Mazouz, Hamid
Mendil, Jihane
Ibnlfassi, Amina
Powiązania:
https://bibliotekanauki.pl/articles/1845219.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
phosphoric acid sludge
flocculation
P2O5 recovery rate
dosage
molecular weight
Opis:
Phosphoric acid sludge is one of the prominent problems in the phosphate industry. Its formation is co-occurred by considerable losses of P2O5 that affect the process performance. Management and valorization of this waste is a key issue. This work aimed to deal with this industrial concern by studying the influence of the flocculation on the sludge sedimentation and thus the P2O5 recovery rate. The flocculation tests were conducted in the presence of various types of anionic polymers. The effect of dosage, molecular weight, and type of flocculant were examined. The results indicated that all polymers showed settling performance improvement. And, the flocculant with the highest molecular weight (F1), showed the best settling performance with a pace of 3.3 cm/min and the lowest turbidity value of 40.4 NTU using a dosage of 5 ppm. Due to its high molecular weight, this polymer carries a polyelectrolyte bridging mechanism, which allows the absorbed polymer to move further away from the surface of the particle and then increases the particle radius, the number of collisions, and thus the particle size. However, for the P2O5 recovery rate, the sulfonic polymer (F5) was the best performer allowing recovery of 78.8% of the total mass of the sludge. F5 is weakly amphoteric. Polymers containing sulfonic acid groups are known to be inherently powerful than the carboxylic acid groups as they are stable due to their high energy barrier. According to the results, the flocculation increases the recovery of P2O5, which represents a profit of more than 30 kg of clarified phosphoric acid per 1 tone of sludge.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 5; 759-771
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode approach to torque and pitch control for an wind energy system using FPGA
Autorzy:
Subudhi, B.
Ogeti, P. S.
Powiązania:
https://bibliotekanauki.pl/articles/229490.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wind-energy conversion systems (WECSs)
sliding mode control (SMC)
torque
pitch control
hill climbing (HC)
perturb and observe (P&O)
FPGA
Opis:
Wind energy, being a fluctuating resource, requires a tight control management to ensure stability when integrated with the grid system. This has triggered interest towards developing advanced controllers. Hence this paper presents the study of a variable speed wind energy conversion system that uses a Double Fed Induction Generator (DFIG). Above rated wind speed, pitch control has been applied and below the rated speed torque control has been adopted. Generator torque control is able to reduce the effects of the pitch actuator limitations. Sliding mode control is applied for torque and pitch control in WECS and it has been implemented in MATLAB SIMULINK and FPGA to achieve control of active and reactive power exchange between the stator of the DFIG and the grid. Performance parameters like pitch angle, active, reactive power, turbine speed, and DC voltage has been compared by using SMC, Hill Climbing (HC) Algorithm and Perturb and Observe (P&O) Algorithm and performance for these three methods has been simulated and implemented in FPGA. Total Harmonic Distortion for all the performance parameters has been reported. Hardware implementation of developed algorithm was accomplished with the help of Xilinx system generator and Xilinx Tool Kit.
Źródło:
Archives of Control Sciences; 2012, 22, 3; 285-302
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding Mode Control-Based MPPT and Output Voltage Regulation of a Stand-alone PV System
Autorzy:
Manuel, Nelson Luis
İnanç, Nihat
Powiązania:
https://bibliotekanauki.pl/articles/2175936.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sliding mode control
PV system
photovoltaic system
MPPT
maximum power point tracking
APF-P&O
artificial potential field
perturb and observe
voltage regulation
Opis:
When it comes to reducing emissions caused by the generation of electricity, among different renewable energy sources, the solar energy gains prominence, due to its geographical availability, simplicity of implementation, and absence of physical moving parts. However, the performance of photovoltaic systems is dependent on environmental conditions. Depending on temperature and solar irradiation, the photovoltaic (PV) system has an operating point where maximum power can be generated. The techniques that are implemented to find this operating point are the so-called maximum power point tracking (MPPT) algorithms. Since weather conditions are variable in nature, the output voltage of the PV system needs to be regulated to remain equal to the reference. Most of the existing studies focus either on MPPT or on voltage regulation of the PV system. In this paper, the two-stage PV system is implemented so that both MPPT and voltage regulation are achieved simultaneously. Additionally, an improved version of the perturb and observe (P&O) algorithm based on artificial potential fields (APF), called APF-P&O, is presented. According to the results of the simulations carried out in MATLAB/Simulink software, the APF-P&O method is more efficient than the conventional method.
Źródło:
Power Electronics and Drives; 2022, 7, 42; 159--173
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
En ensom norsk grav i Poznań
Autorzy:
Lange, Tadeusz Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/1163416.pdf
Data publikacji:
2015-11-20
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Halldor Espelid
andre verdenskrig
Sagan krigsfangeleir
Den store flukten
Hærens flygevåpen
331 skvadron
Sagan P.O.W. camp
the great escape
royal norwegian air force
331 squadron
World War II
Opis:
The article is an account of the life and death of Halldor Espelid, a young Norwegian RAF pilot born in Bergen, trained at “Little Norway” in Canada, shot down over occupied France, put in the POW camp for airmen in Sagan (now Żagań in Poland), arrested near Flensburg while taking part in the so-called Great Escape, and murdered at the age of 24 by the Kiel Gestapo. His body was cremated, his ashes buried at Sagan and later moved to the Old Garrison Cemetery in Poznań, Poland, together with the remains of 47 other participants of the famous Great Escape murdered at Hitler’s personal order.
Źródło:
Folia Scandinavica Posnaniensia; 2015, 17; 48-55
1230-4786
2299-6885
Pojawia się w:
Folia Scandinavica Posnaniensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 36

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