Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "Şahın, M." wg kryterium: Autor


Tytuł:
Design of a Laboratory Unit Air-Conditioning System with Matlab/Simulink Software
Autorzy:
Koçyiğit, N.
Şahin, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031881.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Tp
07.20.-n
07.20.Mc
Opis:
In this study, design of an electronic air-conditioning system was carried out using Matlab/Simulink software. The air-conditioning system was designed as a laboratory experimental setup. The aim of this study was to revise and to reuse an outdated air-conditioning laboratory unit, by using improved methods. General equations were defined separately for each part and cell of this air conditioning system. Using these equations Matlab/Simulink models for every component were created. The Matlab/Simulink models were combined and verified with theoretical results. The simulation results show that theoretical results are compatible with the simulation results. These results were tested for input and output air enthalpy values and for humidity values. In addition, air mass flow rates for the number of different fan speeds were compared. The coherent simulation results showed that the general model of the air conditioning system, designed in Matlab/Simulink, behaves correctly. This model will be used in the future studies for comparison of real system results with simulation results.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 839-842
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Design Steps of a Hybrid Energy System
Autorzy:
Şahın, M.
Okumuş, H.
Powiązania:
https://bibliotekanauki.pl/articles/1031609.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
88.05.Ec
88.05.Gh
88.05.Rt
Opis:
In this paper the design stages of a mixed photovoltaic-wind energy system, supplied with solar and wind energy was discussed. First, general information about the employed wind turbines and solar panels is given and their basic characteristics are addressed. Then, essential information for the system setup and measurements was given. The system setup, operation of the system, the ways to store energy and how energy is consumed were described and the results were interpreted. This study serves as a background for the experimental studies in the future.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1160-1164
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Wave Energy Converter System with Linear Generator
Autorzy:
Şahin, M.
Özdinç, I.
Powiązania:
https://bibliotekanauki.pl/articles/1401997.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
88.60.nf
07.10.-h
Opis:
It is not wrong to say that wave energy will be one of the most important energy sources to be used in the future, when it is thought that three-quarters of the world is covered by water. The initial investment and maintenance costs are the only expenses, beside not any price have to be paid for the primary energy. The wave energy does not leave any contaminants, as well as it is cheap, clean, environmentally, friendly and a great energy sources. In this study, wave energy converter system which has a four poles linear generator is discussed. The Linear generator model has been designed and created as a portable model. The results obtained from this model were examined.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-243-B-245
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Surfactant Types on the Size of Tin Oxide Nanoparticles
Autorzy:
Boran, F.
Çetinkaya, S.
Şahin, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031632.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
nanoparticle
tin oxide
surfactant
Opis:
In this study, tin oxide (SnO₂) nanoparticles were synthesized by hydrothermal method in the presence of hydrazine and ammonia by adding surfactant for 12 h in a Teflon autoclave at 100°C reaction temperature. Tin(II) chloride hydrate as an inorganic precursor, hexadecyl trimethyl ammonium bromide (CTAB), and tetrapropyl ammonium bromide (TPAB) as cationic, and sodium dodecyl sulfonate (SDS) as anionic surfactants were used. The results showed that the size and shape of nanoparticles depended on the surfactant types. The nanoparticles sizes between 17.5 and 19.7 nm were obtained by changing types of surfactants. Synthesized tin oxide nanoparticles were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and the Fourier transform infrared spectroscopy.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 546-548
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of GSM, LTE and Wi-Fi Electromagnetic Radiation in Dwellings
Autorzy:
Karan, Y.
As, N.
Şahın, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031943.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
wireless network adapter
electromagnetic radiation
electromagnetic pollution
global system for mobile communications
wireless fidelity
Opis:
Electromagnetic radiation exposure increases with the rise of the wireless communication devices. Electromagnetic radiation, especially near 2400 MHz band, has gradually increased with the widespread of wireless fidelity adapter in indoor environment. In this study, electromagnetic radiation in dwellings where different Wi-Fi adapters and routers are used was assessed by measuring the electric field and compared with other electromagnetic radiation source and the limits set by the Information and Communication Technologies Authority. Measurements were taken in the range of 760-2690 MHz bands used by GSM, 3G/LTE and Wi-Fi technologies. The detected values for all frequencies are significantly lower than the limits of the Information and Communication Technologies Authority. Among the electromagnetic radiation sources, electromagnetic radiation of Wi-Fi adapter is higher than GSM/3G/LTE sources radiation in dwellings. Electromagnetic radiation values in nearest point of high power adapter Wi-Fi antenna are close to the Information and Communication Technologies Authority limit value. Results show that electromagnetic radiation based on Wi-Fi adapters or routers can be higher than GSM based electromagnetic radiation.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 509-512
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Subspectral Editing with a Multiple Quantum Trap of IS$\text{}_{n}$ Spin Systems by Using Product Operator Theory
Autorzy:
Şahin, M.
Tokatli, A.
Bahçeli, S.
Gençten, A.
Powiązania:
https://bibliotekanauki.pl/articles/2036880.pdf
Data publikacji:
2003-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.56.Dj
82.56.Jn
Opis:
Product operator theory was often used to describe analytically multipulse NMR experiments for weakly coupled spin systems. In this study first we introduce the descriptions of subspectral editing with a multiple quantum trap NMR spectra for IS$\text{}_{n}$ I=1 /2, S=5/2 with n=1, 2, 3) spin systems by using product operator formalism. These theoretical investigations lead us to form the general expressions for the intensities of the spin -1/2 nuclei coupled to the nuclei with spin ≥5/2. The obtained results can be used for the spectral editing in both liquid-state and solid-state NMR experiments. Furthermore, in order to satisfy the obtained analytical expressions for signal intensities we add the presentation of analytically description of subspectral editing with a multiple quantum trap sequence for weakly coupled IS (I=1/2, S=7/2) spin system.
Źródło:
Acta Physica Polonica A; 2003, 104, 1; 73-80
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of different pruning treatments on the growth, fruit quality and yield of 'Hacihaliloglu' apricot
Wpływ różnych zabiegów cięcia na wzrost, jakość i plon owoców moreli ‘Hacihaliloglu’
Autorzy:
Naim Demirtas, M.
Bolat, I.
Ercisli, S.
Ikinci, A.
Olmez, H.A.
Sahin, M.
Altindag, M.
Celik, B.
Powiązania:
https://bibliotekanauki.pl/articles/11541916.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
pruning treatment
plant cultivar
plant growth
fruit quality
fruit yield
Hacihaliloglu cultivar
apricot
Prunus armeniaca
summer pruning
winter pruning
pomology
Turkey
Opis:
This study was conducted in Malatya, between 1999 and 2003, and the region's most important dried apricot variety, Hacihaliloglu was used as material. In the study, the effect of 5 different combined or alone pruning treatments on the growth, fruit quality and yield characteristics were determined in comparison with non-pruned trees. Pruning treatments in different periods did not statistically affect phenological features and fruit dimensions but strongly affected total soluble solid and fruit firmness of Hacihaliloglu apricot cultivar. The highest average yield considering trunk cross-sectional area was obtained as 0.34 kg·cm-2 from pre-harvest summer pruning treatment and the highest share of flower bud was observed as 68.29% in pre-harvest summer+winter pruning treatment. Pruning applications significantly affected both shoot diameter and length. The highest shoot diameter and length were obtained from pre-harvest summer+winter pruning application as 8.52 mm and 77.84 cm, respectively. The highest leaf area was determined as 39.43 cm2 in post harvest pruning treatment.
Badanie przeprowadzono w miejscowości Malatya w latach 1999–2003 na najważniejszej w regionie odmianie moreli do suszenia, Hacihaliloglu. W badaniu określono wpływ 5 różnych zabiegów cięcia na wzrost, jakość owoców oraz plonowanie w porównaniu z drzewami nieprzycinanymi. Zabiegi cięcia w różnych okresach nie wpłynęły w sposób istotny na cechy fenologiczne ani rozmiary owoców, natomiast wywarły silny wpływ na zawartość ekstraktu w soku oraz jędrność owoców moreli odmiany Hacihaliloglu. Najwyższy średni plon, 0,34 kg·cm-2 przy uwzględnieniu powierzchni przekroju poprzecznego pnia osiągnięto przy letnim przycinaniu po zbiorze owoców, a największy udział pąków – 68,29%, – zaobserwowano przy przedzbiorczym zabiegu cięcia lato+zima. Zastosowanie cięcia istotnie wpłynęło zarówno na średnicę pędów jak i ich długość. Największą średnicę i długość pędów, odpowiednio 8,52 mm i 77,84 cm, otrzymano stosując przedzbiorcze cięcie lato+zima. Największą powierzchnię liścia, 39,43 cm2 uzyskano przy pozbiorczym zabiegu cięcia.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2010, 09, 4; 183-192
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Istanbul disaster information system
Autorzy:
Torun, M. K.
Korkmaz, N.
Karaman, H.
Yagci, A.
Yildiz, S. S.
Ozkan, A.
Sahin, M.
Tari, E.
Powiązania:
https://bibliotekanauki.pl/articles/225748.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
klęski żywiołowe
zarządzanie kryzysowe
Turcja
natural disasters
crisis management
Turkey
Źródło:
Reports on Geodesy; 2006, z. 5/80; 527-536
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Pulse Duration on Structure and Surface Characteristics of Micro-Arc Oxidation Coatings Formed on Aluminum Alloy
Autorzy:
Yilmaz, M.
Şahin, O.
Powiązania:
https://bibliotekanauki.pl/articles/1186801.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.15.-z
81.16.Pr
Opis:
Micro arc oxidation (MAO) of aluminum alloy samples was studied using bipolar pulses with various pulse durations under constant duty cycle. The processing times were chosen as 20, 30 and 40 minutes. The X-ray diffraction (XRD) technique, scanning electron microscope (SEM), surface roughness measurement (R_a) and indentation tests were employed to investigate the phase distribution, microstructure, surface properties and hardness of the coatings, respectively. By increasing the pulse duration and processing time, coatings with different surface roughness, thickness and hardness were fabricated.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 673-676
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spark Plasma Sintering of Boron Carbide Ceramics Using Metallic Silicon in Square Cross Section
Autorzy:
Cengiz, M.
Sahin, F.
Powiązania:
https://bibliotekanauki.pl/articles/1401426.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
Opis:
B₄C ceramics were fabricated by spark plasma sintering (SPS) technique with 5 vol.% silicon as sintering additive. Optimization of SPS method production parameters for B₄C ceramics having geometries 50×50×5 mm, square cross section will be performed. The sintering process was carried out at different temperatures by applying 40 MPa of pressure under vacuum atmosphere. The effect of silicon additive, sintering temperature and different soaking times on density, vickers hardness, fracture toughness and microstructure were examined. The mechanical properties of the B₄C ceramics having silicon as additive were compared with the results of monolithic B₄C. The hardness and fracture toughness of the samples were evaluated by the vickers indentation technique. Microstructures of spark plasma sintered B₄C samples with different parameters in square cross section were characterized by using SEM technique.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1370-1372
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of CaO on the nanohardness behaviour of AZ63 magnesium alloys produced by mechanical alloying method
Autorzy:
Boztas, M.
Ozarslan, S.
Sahin, O.
Powiązania:
https://bibliotekanauki.pl/articles/1068219.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
87.85.J
Opis:
In this study we aimed to produce AZ63 magnesium alloys containing different amounts of CaO, to investigate the nanohardness behaviour of the resulting alloys. These alloys were produced by mechanical alloying under argon atmosphere. Magnesium based alloys with the initial CaO content of 0.1%, 0.3%, and 0.5% were produced by high-energy ball milling, followed by process that involved cold pressing and sintering. These alloys were characterized using scanning electron microscopy, scanning probe microscopy, X-ray diffraction, and nanoindentation methods. Unloading segments of nanoindentation curves were analyzed using Oliver-Pharr method. Experimental results show that measured nanohardness exhibits a peak load dependence. As a result, in these alloys the microstructure and nanohardness depend on the content of CaO.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 357-361
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of bean genotypes from turkey resistance to common bacterial blight and halo blight diseases
Identyfikacja odorności genotypów fasoli z Turcji na zgorzel bakteryjną i zarazę
Autorzy:
Donmez, M.F.
Sahin, F.
Elkoca, E.
Powiązania:
https://bibliotekanauki.pl/articles/11542438.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Bean diseases caused by different pathogens reduce important yield and quality of beans in different bean growing regions in both Turkey and the other bean producing countries. In the present study, bacterial pathogens in the species of Pseudomonas savastanoi pv. phaseolicola (Burkholder) Garden et al. and Xanthomonas axonopodis pv. Phaseoli (Smith) Vauterin et al. causing economically important disease on bean plants growing in the commercial fields of Erzurum and Erzincan provinces located in the Eastern Anatolia region of Turkey has been isolated and identified. Totally thirty-six bean genotypes and two commercial cultivars commonly grown in the region have been screened for resistance to these pathogens both in greenhouse and field condition during 2001–2002. Disease severity in the field condition reduced seed quality and quantity of bean. Among the thirty-eight genotypes tested, only 36K was found to be resistant to both of the pathogens. Bean diseases caused by different pathogens reduce important yield and quality of beans in different bean growing regions in both Turkey and the other bean producing countries. In the present study, bacterial pathogens in the species of Pseudomonas savastanoi pv. phaseolicola (Burkholder) Garden et al. and Xanthomonas axonopodis pv. Phaseoli (Smith) Vauterin et al. causing economically important disease on bean plants growing in the commercial fields of Erzurum and Erzincan provinces located in the Eastern Anatolia region of Turkey has been isolated and identified. Totally thirty-six bean genotypes and two commercial cultivars commonly grown in the region have been screened for resistance to these pathogens both in greenhouse and field condition during 2001–2002. Disease severity in the field condition reduced seed quality and quantity of bean. Among the thirty-eight genotypes tested, only 36K was found to be resistant to both of the pathogens.
Choroby fasoli spowodowane różnymi patogenami zmniejszają plon i jakość fasoli w różnych regionach, gdzie uprawia się tą roślinę, zarówno w Turcji, jak i innych krajach produkujących fasolę. W niniejszym badaniu wyizolowano i zidentyfikowano patogeny bakteryjne u gatunku Pseudomonas savastanoi pv. phaseolicola (Burkholder) Garden et al. and Xanthomonas axonopodis pv. Phaseoli (Smith) Vauterin et al. powodującego ekonomicznie ważną chorobę roślin fasoli rosnących na polach komercyjnych w prowincjach Erzurum i Erzincan znajdujących się w regionie Wschodniej Anatolii w Turcji. Przebadano ogółem trzydzieści sześć genotypów fasoli oraz dwie odmiany powszechnie uprawiane w tym regionie w latach 2002–2002 pod kątem ich odporności na te patogeny, zarówno w warunkach szklarniowych, jak i polowych. Nasilenie choroby w warunkach polowych zmniejszyło jakość i ilość nasion fasoli. Pośród trzydziestu ośmiu zbadanych genotypów, stwierdzono, że tylko 36K jest odporny na obydwa patogeny.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2013, 12, 4; 139-151
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the Surface Properties of Cp-Ti by Pulsed Electro-Spark Deposition
Autorzy:
Yılmaz, M.
Atar, E.
Şahin, O.
Kayalı, E.
Powiązania:
https://bibliotekanauki.pl/articles/1293045.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.47.De
61.82.Bg
Opis:
Al-Ti intermetallic compounds were coated by electro-spark deposition. Commercially pure titanium (Cp-Ti) (grade 2) and aluminum rods were used as substrate and electrode materials, respectively. During the electro-spark deposition experiments the following pulse parameters in a group were used: pulse current amplitude, pulse duration and pause between the pulses of a pulse group with 100-300-500 A, 50-100 μs, and 100 μs, respectively. Al-Ti coatings having a thickness range of 15-30 μm were formed on the surface of titanium substrate using electro-spark deposition process. The coating properties such as the roughness and the thickness increased with increasing pulse duration and pulse current amplitude. The mass transfer coefficient decreased with increasing pulse current amplitude and pulse duration. The quality of the adhesion characters of the coatings, determined by Rockwell-C adhesion test, becomes worse from HF-2 to HF-4, due to increase of pulse current amplitude. Depending on the electro-spark deposition process parameters, the coating formed as AlTi or as layered structure consisting of AlTi+$AlTi_3$ when pulse current amplitude increases. The Al-Ti coatings include some micro cracks lying throughout the coating from surface to interface which is nature of this process. The maximum cross-sectional hardness of the coatings were in the range of 800-1150 HV.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 593-596
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Spark Plasma Sintering of Silicon Carbide Ceramics Using Alumina
Autorzy:
Unlu, M.
Goller, G.
Yucel, O.
Sahin, F.
Powiązania:
https://bibliotekanauki.pl/articles/1216300.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
81.05.Je
Opis:
SiC ceramics were fabricated by spark plasma sintering technique with the use of $Al_2O_3$ additive. The sintering process was carried out at three different temperatures in the range of 1700-1800C applying two different pressures 40 and 80 MPa under vacuum atmosphere. The effect of additive, different temperatures and pressures on densification behaviour, density, Vickers hardness, fracture toughness, and microstructure were examined. The hardness and fracture toughness of the samples were evaluated by the Vickers indentation technique. Microstructure of spark plasma sintered SiC samples were characterized by using scanning electron microscopy technique. The highest value of fracture toughness $5.9 ± 0.2$ MPa $m^{1/2}$ was achieved with the addition of 5 vol.% $Al_2O_3$.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 257-259
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of Fine-Grained Silicon-Nitride Ceramics and their Characterization by Depth-Sensing Indentation Tests
Autorzy:
Şahin, O.
Güder, H.
Uzun, O.
Şahin, E.
Sopicka-Lizer, M.
Göçmez, H.
Artunc, E.
Powiązania:
https://bibliotekanauki.pl/articles/1402391.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
62.20.de
81.05.Je
Opis:
Both pressureless-sintered and dense, fine-grained silicon nitride ceramics were produced from mechanochemically activated nitride-based precursors. Scanning Electron Microscopy (SEM), Transmition Electron Microscopy (TEM), X-Ray Diffraction (XRD) and an ultra-low load microhardness tester were used to characterize these ceramics. Depth-sensing indentation (DSI) tests in the range of 200-1800 mN were performed on the silicon nitride ceramic to determine dynamic hardness (H_d) and reduced elastic modulus (E_r) values. These values were deduced by analyzing the unloading segments of the DSI curves. It was found that both H_d and E_r exhibits a significant indentation load dependence. Nix-Gao (NG) model was used to analyze the dynamic hardness data in the calculation of the load independent hardness value.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-355-B-359
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies