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Tytuł:
Xylophagous beetles (Coleoptera) in the zones of Gomilshanski lisy National Nature Park with different management regime
Autorzy:
Meshkova, V.
Skrylnik, Y.
Bieliavtsev, M.
Zinchenko, O.
Borysenko, O.
Markina, T.
Powiązania:
https://bibliotekanauki.pl/articles/2106654.pdf
Data publikacji:
2022
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
window trap
species composition
management regime
biodiversity
Coleoptera
xylophage
Gomilshanski lisy National Nature Park
Opis:
The purpose of the research was to assess the species composition and biodiversity indices for xylophagous beetles collected by window traps in the parts of Gomilshanski lisy National Nature Park with different management regimes and anthropogenic load. Four window traps were placed in each of the five groups of sample plots: clear felling, selective felling, stationary recreation, regulated recreation and protected zone. The data were analysed using the statistical software package PAST, particularly, the Menhinick index (DMn) and dominance index (D) were evaluated and classical clustering (unweighted pair-group average [UPGMA]) was performed. A total of 42 species of xylophages (9903 individuals) were collected from Curculionidae (Scolytinae and Cossoninae), Cerambycidae, Histeridae, Bostrichidae, Buprestidae and Lymexilidae. The highest species richness was in the plots of clear and selective felling (25 and 22 species, respectively) and the lowest was in the protected zone (16 species), regulated recreation (19 species) and stationary recreation (22 species). The Menhinick index (DMn) was the lowest in the protected zone (0.27), increased in the zone of regulated recreation (0.43) and stationary recreation (0.45) and was maximal in the plots of selective and clear felling (0.69 and 0.77, respectively). The number of individuals was maximal in the protected zone and minimal at the plots of selective and clear felling. All sites were dominated by Xyleborinus saxesenii (Ratzeburg, 1837) (66–85% individuals) and Anisandrus dispar (Fabricius, 1792) (8.5–20.7% individuals). Minimal dominance (0.49) was found in the plot of clear felling. Cluster analysis showed similarity of the xylophage complex in the plots of clear and selective felling, as well as in the zone of stationary and regulated recreation, which differed from the protected zone.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2022, 64, 2; 69-82
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
One-day-ahead forecast of state of turbulence based on todays economic situation
Autorzy:
Chlebus, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/22446545.pdf
Data publikacji:
2018
Wydawca:
Instytut Badań Gospodarczych
Tematy:
forecasting
state of turbulence
regime switching
risk management
risk measure
market risk
Opis:
Research background: In the literature little discussion was made about predicting state of time series in daily manner. The ability to recognize the state of a time series gives, for example, an opportunity to measure the level of risk in a state of tranquility and a state of turbulence independently, which can provide more accurate measurements of the market risk in a financial institution. Purpose of the article: The aim of article is to find an appropriate tools to predict, based on today's economic situation, the state, in which time series of financial data will be tomorrow. Methods: This paper proposes an approach to predict states (states of tranquillity and turbulence) for a current portfolio in a one-day horizon. The prediction is made using 3 different models for a binary variable (Logit, Probit, Cloglog), 4 definitions of a dependent variable (1%, 5%, 10%, 20% of worst realization of returns), 3 sets of independent variables (un-transformed data, PCA analysis and factor analysis). Additionally, an optimal cut-off point analysis is performed. The evaluation of the models was based on the LR test, Hosmer-Lemeshow test, Gini coefficient analysis and CROC criterion based on the ROC curve. The analyses were performed for 43 individual shares and 5 portfolios of shares quoted on the Warsaw Stock Exchange. The study has been conducted for the period from 1 January 2006 to 31 January 2012. Findings & Value added: Six combinations of assumptions have been chosen as appropriate (any model for a binary variable, the dependent variable defined as 5% or 10% of worst realization of returns, untransformed data, 5% or 10% cut-off point respectively). Models built on these assumptions meet all the formal requirements and have a high predictive and discriminant ability to one-day-ahead forecast of state of turbulence based on today's economic situation.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2018, 13, 3; 357-389
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impacts of Climate Change on Hydrological Regime and Water Resources Management of the Narew River in Poland
Autorzy:
Malinowski, Ł.
Skoczko, I.
Powiązania:
https://bibliotekanauki.pl/articles/123713.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Narew River
water resources
ecosystem
hydrological conditions
global warming
Opis:
The amount of water required to support a river ecosystem in proper condition are of particular importance in the areas of high natural value. The hydrological threats for the protected areas are region-specific and vary from region to region. The local hydrological conditions depend largely on the temporal and spatial variations of the hydrologic cycle, of the main components and physiographic conditions on site. Future climate change is projected to have a significant impact on the hydrological regime, water resources and their quality in many parts of the world. The water-dependent ecosystems are exposed to the risk of climate change through altered precipitation and evaporation. Investigating the current climate changes and their hydrological consequences are very important for hydrological issues. This analysis may be a very important foundation for determining the causes observed in the recent period of anomalous growth – both hydrological and climatic. The aim of the research is to assess the effect of projected climate change on water resources in lowland catchment the Narew River in Poland. The hydrological reaction to climate warming and wetter conditions includes changes in flow and water level. This paper describes the directions of changes climatic and hydrological conditions and the impact of climate change on the Narew River. The data such as: daily air temperature, precipitation obtained from the Bialystok climate station located within the Narew river and hydrological data such as water flows and water states observed in water gauges were used for the analysis of climate variability and their hydrological consequences. The results show a significant decrease in winter outflows in river, as well as a delayed increase in the spring melt flow. It has also been observed that this is the initial phase of changes in maximum water levels and maximum flows.
Źródło:
Journal of Ecological Engineering; 2018, 19, 4; 167-175
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poland–USA sectoral trade balances: regime shifts and the nonlinear impact of currency fluctuations
Autorzy:
Pruchnicka-Grabias, Izabela
Piekunko-Mantiuk, Iwona
Hegerty, Scott W.
Powiązania:
https://bibliotekanauki.pl/articles/40433428.pdf
Data publikacji:
2024-03-15
Wydawca:
Akademia Leona Koźmińskiego w Warszawie
Tematy:
Trade balances
USA
Polska
Cointegration
Structural breaks
Opis:
Purpose – The Polish economy has undergone major challenges and changes over the past few decades. The country’s trade flows, in particular, have become more firmly tied to the country’s Western neighbors as they have grown in volume. This study examines Poland’s trade balances in ten Standard International Trade Classification (SITC) sectors versus the United States of America, first testing for and isolating structural breaks in each time series. These breaks are then included in a set of the cointegration models to examine their macroeconomic determinants. Design/methodology/approach – Linear and nonlinear and nonlinear autoregressive distributed lag models, both with and without dummies corresponding to structural breaks, are estimated. Findings – One key finding is that incorporating these breaks reduces the significance of the real exchange rate in the model, supporting the hypothesis that this variable already incorporates important information. It also results in weaker evidence for cointegration of all variables in certain sectors. Research limitations/implications – This study looks only at one pair of countries, without any third-country effects. Originality/value – An important country pair’s trade relations is examined; in addition, the real exchange rate is shown to incorporate economic information that results in structural changes in the economy. The paper extends the existing literature by conducting an analysis of Poland’s trade balances with the USA, which have not been studied in such a context so far. A strong point is a broad methodology that lets compare the results the authors obtained with different kinds of models, both linear and nonlinear ones, with and without structural breaks.
Źródło:
Central European Management Journal; 2024, 32, 1; 116-133
2658-0845
2658-2430
Pojawia się w:
Central European Management Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The optimal portfolio in respect to Expected Shortfall: a comparative study
Optymalny portfel na podstawie Expected Shortfall: badania porównawcze
Autorzy:
Gurgul, H.
Machno, A.
Syrek, R.
Powiązania:
https://bibliotekanauki.pl/articles/108336.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
value at risk
Expected Shortfall
interdependency
regime switching copulas
risk management
wpółzależność
model przełącznikowy
kopula
zarządzanie ryzykiem
Opis:
Value at Risk plays a crucial role in the risk management. However, this risk measure has some drawbacks. The alternative risk measure is Expected Shortfall, which is rarely used, but exhibits desirable properties. In the paper, the estimation of both risk measures has been conducted, for pairs of index returns (DJIA, DAX, ATX), based on Markowitz model, the regime switching copula model and the multivariate GARCH model. The results suggest that a misspecification can cause many errors. Incorrect models cause bias of mean, especially models which do not assume dynamic structure of the market Both an underestimation and an overestimation of a risk has been observed. In the paper, it is shown that the measure of change in Expected Shortfall as a function of the expected return is strongly underestimated under the normal distribution assumption.
Value at Risk jest kluczową wielkością w zarządzaniu ryzykiem. Jako miara ryzyka nie ma ona jednak pożądanych własności. Alternatywną miarą jest Expected Shorfall, która jest mniej używana w praktyce, za to ma własności, które są oczekiwane przez użytkowników modeli. W artykule zostały oszacowane obie miary, dla par stóp zwrotu z indeksów DJIA, DAX i ATX, na podstawie modeli Markowitza, kopuli przełącznikowych oraz wielowymiarowego GARCH. Otrzymane wyniki pokazują, iż zły dobór modelu może powodować wiele błędów. Modele, które nie uwzględniają dynamicznego charakteru badanych szeregów czasowych błędnie oceniają średnią. Obie badane miary ryzyka mogą być przeszacowane oraz niedoszacowane. Szczególnie błędne okazało się oszacowanie zmiany Expected Shortfall wraz ze wzrostem oczekiwanej stopy zwrotu przy założeniu rozkładu normalnego.
Źródło:
Managerial Economics; 2013, 14; 17-38
1898-1143
Pojawia się w:
Managerial Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fertilization and Application of Different Biochar Types and their Mutual Interactions Influencing Changes of Soil Characteristics in Soils of Different Textures
Autorzy:
Šimanský, Vladimír
Šrank, Dušan
Jonczak, Jerzy
Juriga, Martin
Powiązania:
https://bibliotekanauki.pl/articles/124211.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
soil management
Effeco
soil organic matter
physical characteristics
soil nutrient regime
soil sorption
Opis:
If we want to develop farming on soil effectively and ecologically, we have to know the soil characteristics, the reasons for the potential low fertility and the ways how to eliminate them. Only this approach allows the rational utilization of the soil fund and achievement of the high effectiveness of the costs needed for the stabilization and increase of fertility and land capability. Recently, many scientific teams have focused their attention on the biochar, a lot of recommendations have been published which are dealing with its application into soil. However, the principal attention has been drawn to the impact of biochar on the particular soils and under the particular conditions. Far less information has been presented about the mutual interactions between the further significant agronomical factors in the combination with biochar. In this primary study, we analyze two new experiments established in the southwest part of Slovakia at the 1 Dolná Streda (sandy soil) and 2 Veľké Uľany (loamy soil) Localities. We discussed (1) the impact of the individual factors on the changes of soil characteristics, and (2) the impact of the individual interactions, such as: soil class – fertilization – biochar on the changes of the soil characteristics. The results indicated that the most significant factor, which influences the monitored soil parameters, is the soil class. The fertilization proved to be a factor which has a negative impact on the humus parameters; on the other hand, it improved the soil sorption. Biochar increased the content of the organic substances in soil and also its environmental effect of retention and immobilization of harmful elements and its positive effect on the soil structure was indicated. The highest frequency of the interactions between the monitored parameters related to the changes of soil characteristics was recorded in the combination fertilization x biochar, and also the soil class x fertilization x biochar.
Źródło:
Journal of Ecological Engineering; 2019, 20, 5; 149-164
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of system of automated protection of employees from COVID-19 and other infections at the enterprise
Autorzy:
Bochkovskyi, A. P.
Sapozhnikova, N. Yu.
Powiązania:
https://bibliotekanauki.pl/articles/2201030.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
safety and health management
COVID-19
acute occupational disease
quarantine regime
system of automated protection
zarządzanie bezpieczeństwem i higieną pracy
choroba zawodowa
kwarantanna
system ochrony
Opis:
Purpose: To develop a system of automated protection of employees from Covid-19 and other infections, it is implemented through minimizing the risks of contracting the SARS-CoV-2 virus and other respiratory viral infections within the enterprise. Design/methodology/approach: Analysis of legal normative documents and scientific and technical literature – to update the scientific problem and formulate the research tasks; methods of system analysis - to build the overall structure of the system and to establish relationships between its elements; simulation methods - to develop the algorithms of functioning and interaction of sensors and actuators of the corresponding subsystems; methods of decision theory and data mining - to develop the training programs and testing the knowledge of employees on epidemic safety. Findings: The system of automated protection of employees from Covid-19 and other infections was developed, which, due to the connection of functionally independent elements according to a certain scheme, allows minimizing the risk of contracting the SARS-CoV-2 virus and other respiratory viral infections of employees at the enterprise and increasing their protection from the occurrence of the corresponding infections by implementing a complex of anti-epidemic measures within the system and providing and constant support of the quarantine regime at the enterprise in accordance with WHO recommendations. The developed system was implemented and pilot tested at the industrial enterprise "Odessa Experimental Plant" (Odessa, Ukraine). Based on the results of the development of the system, an application was filed for obtaining a patent for invention No. a 202105894 dated 20.10.2021. Research limitations/implications: The number of system elements can change (increase/decrease) depending on the number of workplaces, as well as areas requiring control. Practical implications: The implementation of the proposed system allows increasing the level of economic sustainability of the enterprise in a complex epidemiological situation of the state or world level by minimizing the risks of enterprise shutdown as a result of the need to limit social and labour connections between employees due to implementation a full range of antiepidemic measures (in accordance with WHO recommendations) at the enterprise and constant compliance with the established quarantine regime by the employees at enterprise. Originality/value: For the first time, the system of automated protection of employees from Covid-19 and other infections was developed and proposed for use at enterprises, institutions and organizations, which, unlike others, allows the implementation of a full range of appropriate anti-epidemic measures at the enterprise (according to WHO recommendations) and ensure compliance with the established quarantine regime by the employees, due to the constant management of the sanitary-epidemic control modes of admission to the enterprise, disinfection of surfaces, ventilation and air decontamination of industrial premises etc.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 112, 2; 70--85
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Funkcjonowanie klubu sportowego pod reżimem ustawy o zasadach zarządzania mieniem państwowym
Functioning of a sports club under the regime of the law on the rules of management of state property
Autorzy:
Dróżdż, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/1064650.pdf
Data publikacji:
2020-07-31
Wydawca:
Polskie Wydawnictwo Ekonomiczne
Tematy:
mienie państwowe
skarb państwa
klub sportowy
środki trwałe
spółka akcyjna
state property
the treasury
sports club
fixed assets
joint-stock company
Opis:
Artykuł opisuje najważniejsze, zdaniem autora, przepisy ustawy z 16.12.2016 r. o zasadach zarządzania mieniem państwowym w zakresie funkcjonowania klubu sportowego — spółki akcyjnej. Ustawa ta wprowadza przede wszystkim trzy warianty nadzoru: uzyskanie zgody walnego zgromadzenia na dokonanie określonych czynności prawnych, uzyskanie zgody organu nadzorczego na dokonanie określonych czynności prawnych, jak też określenie zasad zbywania składników aktywów trwałych przez zastosowanie trybu przetargu oraz wyjątki od obowiązku jego zastosowania. W określonej sytuacji obowiązki te muszą być stosowane przez kluby sportowe, funkcjonujące np. w formie spółki akcyjnej. Celem artykułu jest także wyjaśnienie wątpliwości, jakie wiążą się z przedmiotowymi przepisami.
The article describes the most important, according to the author, the provisions of the Act of 16.12.2016 on the principles of managing state property in the field of functioning of sports club — joint-stock company. This Act introduces primarily three variants of supervision: obtaining the consent of the general meeting of the shareholders for specific legal actions, obtaining the consent of the supervisory body for specific legal actions, as well as determining the rules for the disposal of fixed assets by applying the tender procedure and exceptions to the obligation to apply it. In a specific situation, that duties must be used by sports clubs which operate in the form of joint-stock company. The purpose of the article is also to clarify the doubts related to these provisions.
Źródło:
Przegląd Ustawodawstwa Gospodarczego; 2020, 7; 27-32
0137-5490
Pojawia się w:
Przegląd Ustawodawstwa Gospodarczego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Security management of systemically important banking institutions inside the European Union financial market
Autorzy:
Pyka, Irena
Pyka, Jan
Powiązania:
https://bibliotekanauki.pl/articles/325162.pdf
Data publikacji:
2019
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
banki globalne
instytucje finansowe o znaczeniu systemowym
ryzyko systemowe
unia bankowa
mechanizm jednolitego nadzoru
SSM
europejski system postępowania naprawczego
SRM
MREL
TLAC
global banks
systemically important financial institutions
systemic risk
banking union
Single Supervision Mechanism
European resolution regime
Opis:
This paper is focused on the problems related to activities of systemically important banking institutions. After the global financial crisis, these institutions were held responsible for the escalation of systemic risk in the international economy. The paper analyses how both the supervision and the regulatory tools that are used in European Union countries to deal with formally identified systemically important institutions have changed. The direct goal of the paper is to identify the specific features of the new regulatory order with regard to global and other systemically important institutions that operate in the European Union. The results of the analysis indicate that the extension of the extent of supervision over activities undertaken by these institutions and the introduction of new prudential regulations, including resolution regimes, do not guarantee the security and the stability of European Union’s financial market. Keywords: global banks, systemically important financial institutions, systemic risk, banking union, Single Supervision Mechanism (SSM), European resolution regime – SRM, MREL, TLAC
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2019, 136; 495-510
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Political Security in Authoritarian Systems with a Resource Rent Economy: a Result of the „Social Contract” and High Resource Prices?
Bezpieczeństwo polityczne w systemach autorytarnych z gospodarką opartą na rencie surowcowej: wynik „umowy społecznej” i wysokich cen surowców?
Autorzy:
Akhremenko, Andrei
Shulika, Yulia
Powiązania:
https://bibliotekanauki.pl/articles/642417.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
political security
resource rent economies
resource dependence
natural resource rents
authoritarian regime
quality of government
social contract
case study
political disciplining
co-optation
resource management
price fluctuations
bezpieczeństwo polityczne
gospodarka oparta na rencie surowcowej
zależność surowcowa
renta surowcowa
reżim autorytarny
jakość rządzenia
umowa społeczna
studium przypadku
dyscyplinowanie polityczne
kooptacja
zarządzanie zasobami
wahania cen
Opis:
Większość badaczy uważa, że państwa bogate w zasoby naturalne mają większą zdolność utrzymywania stabilności politycznej w porównaniu do krajów bez takiego dostępu do wyjątkowych zysków. Jednak niektóre reżimy autokratyczne oparte na rencie surowcowej są jednogłośnie uważane za niestabilne, a ich zdolność do uzyskiwania maksymalnych korzyści nie zawsze przyczynia się do bezpieczeństwa politycznego i gospodarczego podczas wahań cen. Opierając się na założeniu, że zdolność państwa do wydobywania zasobów nakłada na nie pewne obowiązki, zadano pytanie badawcze dotyczące jakości rządzenia jako domniemanego kluczowego czynnika pomiędzy zależnością od zasobów i bezpieczeństwem politycznym państwa a zdolnością do wypełniania przez nie “umowy społecznej.” Tę ostatnią określa się jako realizację decyzji politycznych oraz dostarczanie dóbr publicznych i usług. Jednak jakość rządzenia jest zasadniczo różna w różnych systemach autokratycznych. Wykorzystując studium przypadku i statystyki opisowe, autorzy starają się ukazać kontekst i ustalić, które czynniki wpływają na określenie horyzontu strategii politycznych stosowanych przez autokratyczną władzę podczas wzrostu i spadku cen zasobów. Autorzy potwierdzają, że zależność od zasobów negatywnie wpływa na bezpieczeństwo polityczne w mniejszym stopniu z powodu braku wzrostu gospo- darczego podczas obniżek cen, a bardziej ze względu na walkę elit politycznych o redystrybucję zasobów, brak mechanizmów dyscyplinujących, słabą reprezentację i systemy odpowiedzialności oraz brak sprzyjających warunków będących podstawą dobrego zarządzania zasobami. Autorzy dochodzą do wniosku, że bezpieczeństwo polityczne w autokratycznych gospodarkach zasobowych osiąga się w drodze współistnienia woli politycznej i czynników wpływających na określenie długości horyzontu planowania.
Most researchers believe that states which are rich in natural resources are more able to maintain political stability in comparison to countries without such an access to exceptional profits. However, some rent resource autocracies are unanimously considered fragile, and their ability to extract maximum rents does not always contribute to political and economic security during price fluctuations. Based on the idea that the state’s ability to extract resources imposes on it certain ob- ligations, the research question touches upon the quality of governance as a supposed core factor, which mediates the resource dependence and political security in terms of stateness and the ability to fulfil the “social contract.” The latter is described as implementation of political decisions, provision of public goods and services. However, the quality of governance is substantially different in various autocratic systems. Using casestudy and descriptive statistics, the authors try to reveal the context and ascertain which factors trigger the horizon length of autocrats` political strategies during rising and falling resource prices. The authors affirm that resource dependence negatively affects political security less due to an absence of economic growth during price breaks, and more due to the struggle of political elites for the redistribution of resources, absence of disciplinary mechanisms, weak representation and accountability systems, and poor enabling environments as a basis for quality of resource management. The authors conclude that political security in autocratic resource economies is achieved through the coexistence of political will and triggers, conducive to specifying the length of the planning horizon.
Źródło:
Przegląd Strategiczny; 2019, 12; 299-318
2084-6991
Pojawia się w:
Przegląd Strategiczny
Dostawca treści:
Biblioteka Nauki
Artykuł

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