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Wyświetlanie 1-13 z 13
Tytuł:
A modified Nuclear Model for Binding Energy of Nuclei
Autorzy:
Sirma, K. K.
Chelimo, L. S.
Khanna, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/1030120.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Core
Heavy Nuclei
Isotones
Isotopes
Potential
Surface region
light Nuclei
Opis:
A new nuclear model to calculate the binding energy of nuclei is proposed. The nucleus is assumed to be composed of two regions; the inner core region and surface region. The inner core is assumed to be composed of Z proton-neutron pairs (Z = N) and the surface region is composed of the unpaired neutrons for a nucleus in which N>Z. The interaction between the core and neutrons in the surface region is assumed to be such that it leads to an average potential Vo in which each neutron in the surface region can move. Knowing the experimental values for the binding energy of nuclei, this average interaction potential Vo has been calculated for light, medium and heavy nuclei. It is found that Vo varies for isotopes and isotones. For isotopes the value of Vo decreases as the neutron number (N) in the surface region of the nucleus increases. The decrease in Vo is quite large when the neutron number increases by unity in light nuclei compared to heavy nuclei. For isotones, the value of Vo increases with an increase in proton number (Z). This is evident for both light nuclei and heavy nuclei.
Źródło:
World Scientific News; 2020, 143; 203-223
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified Integrated Nuclear Model for the Binding Energy of Finite Nuclei
Autorzy:
Cherop, Hezekiah K.
Khanna, Kapil M.
Powiązania:
https://bibliotekanauki.pl/articles/1031026.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Nuclear model
binding energy
binding fraction
nuclei
Opis:
A modified integrated nuclear model (MINM) for calculating the binding energies of finite nuclei is proposed. The model is an improvement of the integrated nuclear model (INM) that was formulated based on the theory of quantum chromodynamics. MINM is a simple model that depends on the proton and neutron numbers, and a variable stability coefficient factor denoted by λ. The variable λ rectifies the inequality in the neutron to proton ratio that results from the increase in the size of the nucleus. The results of the binding fraction obtained from MINM were compared with the existing experimental data obtained from atomic mass evaluation tables, AME2016. It was found that, the root mean square deviation for the binding fractions obtained from MINM is 0.2267 MeV with respect to the experimental data, while the root mean square deviation for the binding fraction obtained from INM is 1.5801 MeV. The root mean square deviation for MINM is very small. This supports the validity of the MINM and the consequent accuracy in the values of the binding fraction for different nuclei, especially in the region whereby A>220.
Źródło:
World Scientific News; 2020, 149; 36-51
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of air nucleus in liquid water and cavitation inception on marine engineering
Autorzy:
Fu, Q.
Chen, M.
Wang, X.
Zhu, R.
Zhang, G.
Powiązania:
https://bibliotekanauki.pl/articles/260137.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
air nuclei
water
molecular dynamics
stability
surface tension
Opis:
The micro air nucleus widely distributed in the ocean is a necessary condition for the cavitation of hydraulic machinery in seawater. In order to study the stability of air nucleus in seawater and cavitation inception, the computational domain of water molecules with air nucleus was studied using the method of molecular dynamics simulation, and the transient characteristics of air nucleus in liquid water were obtained. The key factors influencing nuclei stability were analyzed. The results showed that air nucleus with a certain mass could maintain the dynamic equilibrium in liquid water. The internal density of air nuclei had a critical value that allowed the nuclei to stably exist in water. The air nuclei mass was the decisive factor in its equilibrium volume in water, and the two were positively correlated. The internal density of air nuclei was negatively correlated with the nuclei radius when the nuclei was stable in water. Liquid surface tension was an important factor affecting the stability of the air nuclei. The larger the initial radius of nuclei, the smaller the water pressure, and the more likely the cavitation occurs.
Źródło:
Polish Maritime Research; 2018, S 3; 111-119
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified Phenomenological Formula for the Ground State Energy of Light Nuclei
Autorzy:
Chemogos, P. K.
Muguro, K. M.
Khanna, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/1046531.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
binding energy
ground state energy
isotopes
light nuclei
liquid drop model
Opis:
A modified phenomenological formula for the ground state binding energy in the region of light nuclei is proposed. Since binding energy is proportional to the volume of a nuclide, the new formula contains a volume term proportional to the mass number A and expresses asymmetry energy and coulomb repulsion energy between protons in a much simpler form than the way it is presented in the liquid drop model. The formula is used to calculate nuclear binding energy using three terms only, namely mass number A, neutron number, N and atomic number, Z. The correspondence with the conventional Liquid drop model and with the experimental results is highly satisfactory for light nuclei. Considering a set of 60 light nuclei for A≤55, the formula yields root mean square deviation of 0.541 MeV, with respect to experimental values. This is better than conventional Liquid drop model which gives a root mean square deviation of 3.485 MeV over the same range of nuclei. The value of f is comparatively smaller for even-odd nuclei when compared to the corresponding even-even nuclei. Thus even-even nuclei are more strongly bound than odd-odd or even-odd nuclei making them more stable.
Źródło:
World Scientific News; 2019, 136; 148-158
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The cavitation nuclei transient characteristics of Lennard-Jones fluid in cavitation inception
Autorzy:
Fu, Q.
Zhang, B.
Zhao, Y.
Zhu, R.
Liu, G.
Li, M.
Powiązania:
https://bibliotekanauki.pl/articles/259255.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
cavitation nuclei
molecular dynamics simulation
Lennard-Jones fluid
cavitation inception
nucleation
Opis:
In the field of ocean engineering, cavitation is widespread, for the study of cavitation nuclei transient characteristics in cavitation inception, we applied theoretical analysis and molecular dynamics (MD) simulation to study Lennard-Jones (L-J) fluid with different initial cavitation nuclei under the NVT-constant ensemble in this manuscript. The results showed that in cavitation inception, due to the decrease of liquid local pressure, the liquid molecules would enter the cavitation nuclei, which contributed to the growth of cavitation nuclei. By using molecular potential energy, it was found that the molecular potential energy was higher in cavitation nuclei part, while the liquid molecular potential energy changes greatly at the beginning of the cavitation nuclei growth. The density of the liquid and the surface layer changes more obvious, but density of vapor in the bubble changes inconspicuously. With the growth of cavitation nuclei, the RDF peak intensity increased, the peak width narrowed and the first valley moved inner. When cavitation nuclei initial size reduced, the peak intensity reduced, the corresponding rbin increased. With the decrease of the initial cavitation nuclei, the system pressure and total energy achieved a balance longer, and correspondingly, they were smaller. In addition, at the beginning of the cavitation nuclei growth, the total energy and system pressure changed greatly.
Źródło:
Polish Maritime Research; 2018, S 2; 75-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Breast cancer nuclei segmentation and classification based on a deep learning approach
Autorzy:
Kowal, Marek
Skobel, Marcin
Gramacki, Artur
Korbicz, Józef
Powiązania:
https://bibliotekanauki.pl/articles/1838197.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
breast cancer
nuclei segmentation
image processing
nowotwór piersi
segmentacja jądra
przetwarzanie obrazu
Opis:
One of the most popular methods in the diagnosis of breast cancer is fine-needle biopsy without aspiration. Cell nuclei are the most important elements of cancer diagnostics based on cytological images. Therefore, the first step of successful classification of cytological images is effective automatic segmentation of cell nuclei. The aims of our study include (a) development of segmentation methods of cell nuclei based on deep learning techniques, (b) extraction of some morphometric, colorimetric and textural features of individual segmented nuclei, (c) based on the extracted features, construction of effective classifiers for detecting malignant or benign cases. The segmentation methods used in this paper are based on (a) fully convolutional neural networks and (b) the marker-controlled watershed algorithm. For the classification task, seven various classification methods are used. Cell nuclei segmentation achieves 90% accuracy for benign and 86% for malignant nuclei according to the F-score. The maximum accuracy of the classification reached 80.2% to 92.4%, depending on the type (malignant or benign) of cell nuclei. The classification of tumors based on cytological images is an extremely challenging task. However, the obtained results are promising, and it is possible to state that automatic diagnostic methods are competitive to manual ones.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2021, 31, 1; 85-106
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wpływu segmentacji jąder komórkowych w rozmazach Papanicolaou na pomiar wymiaru fraktalnego
Analysis of influence of cell nuclei segmentation in Papanicolaou smears on fractal dimension measurements
Autorzy:
Mazurek, P.
Oszutowska-Mazurek, D.
Powiązania:
https://bibliotekanauki.pl/articles/153435.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
estymacja
wymiar fraktalny
przetwarzanie obrazów
jądra komórkowe
estimation
fractal dimension
image processing
cell nuclei
Opis:
W artykule badano wrażliwość metody pryzm trójkątnych (TPM - Triangular Prism Method) do estymacji wymiaru fraktalnego dla różnych rozmiarów jądra komórkowego w cytologii ginekologicznej wybarwionej metodą Papanicolaou. Zmiana obszaru analizy pozwala na zmniejszenie wpływu algorytmu segmentacji na wynik. Wykorzystanie kanału zielonego gęstości optycznej i zmian wymiaru fraktalnego dla par skal: 1-2 oraz 2-3 pozwala na otrzymanie wyników dla systemu klasyfikacji z małą wrażliwością na segmentację.
In the paper the influence of segmentation algorithms on estimation for the fractal dimension is analyzed. The Papanicolaou smears are very complex images and their automatic analysis is very hard. Segmentation algorithms of cell nuclei should support blurred and noised edges between cytoplasm and cell nucleus. The estimation of the cell nuclei image parameters is necessary, but the edge related parameters are not sufficient. The classification of the cells (correct/atypical) needs surface related parameters. Fractal based estimators are important for classification. The Papanicolaou images are colourful but only the green channel is important [9]. The TPM (Triangular Prism Method) is applied to the square area (2N+1 edge size) [5]. Multiple box selection variants occur and the multiple TPM analysis is applied and the mean value is calculated. The fractal dimension is calculated for a pair of scales (1-2, 2-3, 3-4). The correct and atypical cell nuclei are known and the analysis is separated. The histograms of difference between the known and reduced cell area are shown (Figs. 6-11). The atypical cells are less sensitive due to a larger size of the analysis area in comparison to the correct ones. Two scales (1-2) and (2-3) are useful, especially for smaller reduction parameter (erosion up to 9 pixels of original cell nuclei). Both scales are used in the classification system [9]. The fractal dimension changes are less than +/- 1%.
Źródło:
Pomiary Automatyka Kontrola; 2012, R. 58, nr 6, 6; 498-501
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of heaviest nuclei and heaviest chemical elements
Autorzy:
Sobiczewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/146684.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
heaviest nuclei
heaviest chemical elements
nuclear reactions
alfa-decay energy
alfa-decay half-life
alfa-decay genetic chains
Opis:
Studies of the heaviest nuclei and heaviest chemical elements are shortly described. Methods of synthesis and identification of these nuclei are discussed. Some details of the studies are illustrated on the example of the nucleus 277Cn, the isotope of the element 112 (copernicium) the discovery of which has been recently approved by IUPAC. General results of the research on superheavy nuclei (atomic number Z = 104–118), synthesized within the period from 1969 (discovery of rutherfordium, Z = 104) up to the present are outlined.
Źródło:
Nukleonika; 2011, 56, 3; 212-216
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The feature selection problem in computer-assisted cytology
Autorzy:
Kowal, M.
Skobel, M.
Nowicki, N.
Powiązania:
https://bibliotekanauki.pl/articles/329941.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
nuclei segmentation
feature selection
breast cancer
convolutional neural network
segmentacja jądra
selekcja cech
rak piersi
sieć neuronowa konwolucyjna
Opis:
Modern cancer diagnostics is based heavily on cytological examinations. Unfortunately, visual inspection of cytological preparations under the microscope is a tedious and time-consuming process. Moreover, intra- and inter-observer variations in cytological diagnosis are substantial. Cytological diagnostics can be facilitated and objectified by using automatic image analysis and machine learning methods. Computerized systems usually preprocess cytological images, segment and detect nuclei, extract and select features, and finally classify the sample. In spite of the fact that a lot of different computerized methods and systems have already been proposed for cytology, they are still not routinely used because there is a need for improvement in their accuracy. This contribution focuses on computerized breast cancer classification. The task at hand is to classify cellular samples coming from fine-needle biopsy as either benign or malignant. For this purpose, we compare 5 methods of nuclei segmentation and detection, 4 methods of feature selection and 4 methods of classification. Nuclei detection and segmentation methods are compared with respect to recall and the F1 score based on the Jaccard index. Feature selection and classification methods are compared with respect to classification accuracy. Nevertheless, the main contribution of our study is to determine which features of nuclei indicate reliably the type of cancer. We also check whether the quality of nuclei segmentation/detection significantly affects the accuracy of cancer classification. It is verified using the test set that the average accuracy of cancer classification is around 76%. Spearman’s correlation and chi-square test allow us to determine significantly better features than the feature forward selection method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 4; 759-770
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Znajomość podstaw profilaktyki raka jądra wśród wybranej grupy mężczyzn
Acquaintance of bases of the prevention of the testicular cancer amongst the chosen group of men
Autorzy:
Kędra, Edyta
Pyśk, Agnieszka
Zielonka, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/906326.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
samobadanie jąder
profilaktyka raka jądra
płeć męska
self-examination of nuclei
prevention of the testicular cancer
man male
Opis:
Wstęp: Profilaktyka pierwszego rzędu, szeroko zakrojona i odpowiednio realizowana, może w znaczący sposób zmienić obecne niekorzystne tendencje w zakresie wczesnego rozpoznawania raka jądra. Cel pracy: Celem pracy jest ocena znajomości podstawowych zasad profilaktyki raka jądra u badanych mężczyzn oraz ich zainteresowania programami profilaktycznymi z tego zakresu. Materiał i metody: Badania przeprowadzono wśród 150 mężczyzn, mieszkańców gminy Międzyrzecz, z wykorzystaniem metody sondażu diagnostycznego opartego na technice ankiety, do której sporządzono autorski kwestionariusz. Wyniki: Mężczyźni w większości nie wykonują samobadania jąder (58% badanych – 87 osób) bądź robią to niesystematycznie (34% – 51 osób), choć nie z powodu skrępowania (56% badanych – 84 osoby). Wizyty u urologa uznają za konieczne, choć większość (68% – 102 osoby) dotychczas z nich nie korzystała. Potwierdzają również konieczność szerszej edukacji w zakresie chorób męskich narządów płciowych, choć nigdy nie brali udziału w programach profilaktycznych dotyczących tej tematyki. Wnioski: Konieczne jest położenie większego nacisku na działania profilaktyczne, kierowane zarówno do pojedynczych mężczyzn, jak i do całej męskiej populacji.
Background: The first order prophylaxis, which is comprehensive and well organised, is able to change significantly the unfavourable tendencies in the early testicular cancer recognition. Aim of the study: The study aims at the evaluation of the knowledge of fundamental preventive measures regarding testicular cancer in men and their interest in prophylactic programmes. Material and methods: The research was carried out among 150 male residents of Międzyrzecz. The method included the diagnostic survey in the form of a questionnaire prepared by the author. Results: Most of the men, examined in the study, do not perform the self-examination of the testicles (58% – 87 examinees), or perform it unsystematically (34% – 51 examinees). However, as the results show, they do not feel embarrassed at the procedure (56% – 84 examinees). They consider regular visits to a urologist as necessary, although, the majority of them have never done it (68% – 102 examinees). They also confirm the need for wider education about the illnesses of the male reproductive organs, although, they have never participated in any preventive programs considering the issue themselves. Conclusions: There is a strong necessity for greater prophylaxis of testicular cancer, directed both to every singular man and the entire male population.
Źródło:
Puls Uczelni; 2015, 4; 9-12
2080-2021
Pojawia się w:
Puls Uczelni
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ nanokryształów CSH na wytrzymałość betonów cementowych stosowanych w budownictwie komunikacyjnym
The influence of CSH nanocrystals on the strength of cement concrete used in civil engineering
Autorzy:
Brzozowski, P.
Szczotkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/160474.pdf
Data publikacji:
2013
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
beton
prefabrykacja
twardnienie betonu
domieszka przyspieszająca twardnienie
zarodek C-S-H
nanokryształ
concrete
prefabrication
concrete hardening
hardening accelerating admixtures
C-S-H phase nuclei
nanocrystal
Opis:
We współczesnym świecie beton jest jednym z najczęściej stosowanych materiałów budowlanych. Duże zapotrzebowanie na ten materiał oraz szybki rozwój technologii, który dokonał się w ciągu ostatnich lat sprawia, że stawiane są mu coraz wyższe wymagania dotyczące jakości i trwałości oraz technologii betonowania elementów i konstrukcji. W celu skrócenia procesów budowlanych coraz częściej stosuje się technikę prefabrykacji pozwalającą na złożenie całych konstrukcji z wcześniej wykonanych elementów oraz masową produkcję elementów małogabarytowych. Powszechnie stosowanymi prefabrykatami elementami infrastruktury drogowej są między innymi belki mostowe, elementy przepustów, panele, ekrany akustyczne oraz pale żelbetowe.
Concrete is one of the most commonly used building materials in the modern world. Strong demand for this material and rapid technological development in recent years has placed higher demands on the quality, durability, and technology of concrete elements and construction. Increasingly, prefabricated technology is being used, with the aim of shortening construction processes; their use allows for assembly of an entire structure from pre-made parts and for the mass production elements of small dimensions. Commonly used prefabricated elements in road infrastructure include bridge girders, culvert elements, panels, sound barriers, and reinforced concrete piles.
Źródło:
Przegląd Budowlany; 2013, R. 84, nr 7-8, 7-8; 43-46
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fusion reaction study of halo system by quantum mechanical-based model for ⁶He+⁶⁴Zn, ⁸B+⁵⁸Ni and 8He+¹⁹⁷Au systems
Autorzy:
Abd Madhi, Maryam H.
Majeed, Fouad A.
Powiązania:
https://bibliotekanauki.pl/articles/2086832.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
semi-classical treatment
fusion barrier distribution
halo nuclei
fusion cross-section
continuum discretized coupled channels
półklasyczne działanie
dystrybucja bariery termojądrowej
jądro halo
przekrój fuzji
kanał sprzężony
Opis:
In the current work the calculations of the reaction cross-section of total fusion σ fus, the fusion barrier distribution D fus, and the probability P fus were achieved for systems ⁶He+⁶⁴Zn, ⁸B+⁵⁸Ni and ⁸He+¹⁹⁷Au which involve halo nuclei by using a semiclassical approach. The semiclassical and quantum mechanics treatments comprise the approximation of WKB for describing the relative motion among projectile nuclei and target nuclei, and the method of CDCC (Continuum Discretized Coupled Channel) for describing the intrinsic motion for the projectile and target nuclei. Our semiclassical calculations yielded findings that were compared to obtainable experimental data as well as quantum mechanics calculations. For fusion cross-sections σ fus below and above the Coulomb barrier Vb, the quantum mechanics coupled channels are very similar, according to the experimental results.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137734, 1--6
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the New Left wave basing on the concept of the Four Waves of Terrorism by David Rapoport and selected political events
Autorzy:
Jach-Chrzaszcz, Artur
Powiązania:
https://bibliotekanauki.pl/articles/1158128.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Aldo Moro
Communism
David Charles Rapoport
Far Left
Far Right
ISIS
National Vanguard
Nuclei Armati Rivoluzionari
Red Army Faction
Red brigades
Terorism
The Four Waves of Terrorism
Ulrike Meinhof
Years of Lead
Opis:
The predominant aim of this publication is to perform a comprehensive analysis of the Third Wave of terrorism, the definition of which was proposed by an American professor, David Charles Rapoport. The author of this paper has decided to refer back to his considerations in his earlier work and to define yet another wave of terrorism basing on chosen political events, which took place during the so-called New Left wave. Within the scope of this article, more recent events that are strictly connected with safety and methods utilized during terrorist attacts are touched upon.
Źródło:
World Scientific News; 2018, 92, 2; 385-391
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-13 z 13

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