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Tytuł:
Technique for spatial objects shaping with abrasive-water jet controlled by virtual image luminance
Technika przestrzennego kształtowania przedmiotów strugą wodno-ścierną sterowaną luminacją wirtualnego obrazu
Autorzy:
Borkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/139447.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
struga wodno-ścierna
strumień wodno-ścierny
kształtowanie płaskorzeźby
głębokość erozji
abrasive water jet
bas-relief shaping
depth of erosion
Opis:
The paper presents a novel method for the 3D shaping of different materials using a high-pressure abrasive water jet and a flat target image. For steering the process of movement of the jet, a principle similar to raster image way of record and readout was used. However, respective colors of pixels in such a bitmap are connected with adequate jet feed rate that causes erosion of material with adequate depth. Thanks to that innovation, one can observe spatial imaging of the object. Theoretical basis as well as spatial model of material shaping and experimental stand including steering program are presented in the paper. There are also presented methodic and some experimental erosion results, as well as practical example of object's bas-relief made of metal.
W artykule przedstawiono nową metodę przestrzennego kształtowania powierzchni przedmiotów z różnych materiałów przy użyciu wysokociśnieniowej strugi wodno-ściernej. Umożliwia ona automatyczne wykonywanie płaskorzeźby obiektu na podstawie jego obrazu. Ogólna koncepcja tej metody polega na wierszującym erodowaniu materiału przez wysokociśnieniową strugę wodno-ścierną przemieszczającą się z odpowiednio zróżnicowaną prędkością. Umożliwia to sterowanie czasem oddziaływania strugi na materiał obrabiany, dzięki czemu uzyskuje się analogiczne zróżnicowanie głębokości erozji. Wykorzystując do tego zróżnicowane natężenie oświetlenia obiektu, zarejestrowane na jego fotograficznym obrazie można odtworzyć jego przestrzenne ukształtowanie. Dzięki procedurze takiego selektywnego pozycjonowania głowicy roboczej wytwarzającej strugę wodno-ścierną o odpowiednich właściwościach nacina się w obrabianym materiale poszczególne ścieżki poobróbkowe, które umieszczone obok siebie tworzą płaskorzeźbę wirtualnego obrazu. W artykule tym omówiono stanowisko badawcze zbudowane do realizacji takiej metody wykonywania płaskorzeźb oraz metodykę i warunki przestrzennego kształtowania różnych materiałów. Zaprezentowano także rezultaty przeprowadzonych badań wraz z analizą jakości uzyskiwanych powierzchni a także zademonstrowano jeden z przykładowych obiektów wyrzeźbionych tą metodą w próbce stopu aluminium.
Źródło:
Archive of Mechanical Engineering; 2010, LVII, 3; 247-261
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of flow behaviour in a three products hydrocyclone screen: numerical simulation and experimental validation
Autorzy:
Wang, Chuanzhen
Chen, Jianzhong
Shen, Lijuan
Ge, Linhan
Powiązania:
https://bibliotekanauki.pl/articles/109798.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
three productshydrocyclone screen
flow behaviour
Computational Fluid Dynamics
particle image velocimetry
water split
Opis:
A novel three products hydrocyclone screen (TPHS) has been successfully developed; it consists of a cylindrical screen embedded in a conventional hydrocyclone (CH). In the new liquid cyclone, the combination of centrifugal classification and screening was employed for particle separation based on size. The aim of this study is to investigate the flow behaviour in TPHS using numerical simulation and experimental validation. A computational fluid dynamics simulation with a 4.35 million grid scheme and linear pressure–strain RSM generated the economic and grid-independence solution, which agreed well with the experiments of particle image velocimetry and water split. The velocity vector profile reveals that TPHS represented similar flow patterns to CH, wherein in addition to the outer downward swirl flow, inner upward swirl flow, central down-flow, second circulatory flow, and mantle, a particular fluid flow named screen underflow was created in TPHS owing to the presence of a cylindrical screen. The velocity distribution demonstrates that in TPHS, relative to CH, with the increase in radius, the lower tangential and higher radial velocity first increased to a peak and subsequently decreased, while the axial velocity primarily reduced to zero, increased in the opposite direction, and finally decreased rapidly to zero again. In addition, a disadvantageous flow, namely, screen backflow, was generated in TPHS, wherein the farther away the flow is from the feed inlet, the earlier this flow behaviour occurred. However, the rational scheme of aperture size and screen length can completely remove the screen backflow in TPHS.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 4; 879-895
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of Water Bodies and Non-vegetated Areas in Selenica ‑ Albania with Sar and Optical Images
Autorzy:
Belba, Pietro
Kucaj, Spartak
Thanas, Jorgaq
Powiązania:
https://bibliotekanauki.pl/articles/2105519.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
SAR image
optical image
collocated image
water bodies
NDVI
Sentinel images
Opis:
The availability of Sentinel satellites for providing open data with optical and SAR imagery leads to better opportunities related to Earth surface mapping and monitoring. Recently, optical fusion with radar data has shown improvement in classification quality and the accuracy of information acquired. In this setting, the main objective of this research is to monitor the environmental impact of an open-pit mine on water, vegetation, and non-vegetation areas by exploring the single and combined use of Sentinel-1 and Sentinel-2 data. The data utilized in this paper were collected from the European Space Agency Copernicus program. After selecting the Selenica region, we explored the products in the Sentinel Application Platform. According to our data, Sentinel-2 misses the small water ponds but successfully identifies the river and open-pit areas. It mistakenly identifies urban structures and cloud areas as non-vegetated and does not identify non-vegetated areas which correspond to mining operation areas. Sentinel-1 identifies very small water ponds and delivers additional information in the cloudy areas, but misses a part of the river. Alongside the strong contribution in identifying the vegetation, it also roughly identifies the non-vegetation areas of mining operations.
Źródło:
Geomatics and Environmental Engineering; 2022, 16, 3; 5--25
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Buryat-Mongols’ Way of Being and Their National Image of the World
Autorzy:
Boldonova, Irina
Powiązania:
https://bibliotekanauki.pl/articles/508728.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Slawistyki PAN
Tematy:
image of the world
landscape
nature
ethnos
nomads
imaginative writing
steppe
water
Opis:
The Buryat-Mongols’ Way of Being and Their National Image of the WorldThe article focuses on the comparison of two main concepts in the national image of the world of the Buryat-Mongols as it applies to their way of being: the Man of the Steppes and the Man of Water and the Woods. The research is based on the theory of the well-known Russian scholar Georgiĭ Gachev, who connects types of landscape and natural environment to national images of the world. Dwelling around Lake Baikal on the one hand, and at flat steppe territories on the other hand is reflected in two alternative ways of living, as well as images of world and forms of imagination. The author of the article analyzes the two variants of identity, which have always been under the influence of certain geographical and climate factors, economic activities, as well as cultural and historic traditions of various Buryat-Mongol ethnic subgroups. Buriacko-mongolska droga życia i narodowy obraz świataArtykuł jest poświęcony komparatystycznej analizie dwóch podstawowych konceptów (hipostaz) buriacko-mongolskiego narodowego obrazu świata: człowiekowi stepów i człowiekowi wody i lasu. Analiza opiera się na teorii znanego rosyjskiego badacza Gieorgija Gaczewa, który postuluje istnienie wzajemnego oddziaływania między obrazami natury i narodowym obrazem świata. Życie wokół jeziora Bajkał z jednej strony i praca w bezkresnym stepie z drugiej znajdują wyraz w tych dwóch podstawowych formach istnienia, światopoglądach i formach wyobraźni. Autorka artykułu analizuje te dwie odmiany tożsamości, które podlegają wpływowi ze strony określonych czynników geograficznych i klimatycznych, aktywności ekonomicznej oraz historyczno-kulturowej tradycji różnych buriacko-mongolskich podgrup etnicznych.
Źródło:
Colloquia Humanistica; 2016, 5
2081-6774
2392-2419
Pojawia się w:
Colloquia Humanistica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The element of water in the architecture of archaic societies
Autorzy:
Mikhailova, R.
Powiązania:
https://bibliotekanauki.pl/articles/345183.pdf
Data publikacji:
2018
Wydawca:
Politechnika Krakowska im. Tadeusza Kościuszki. Wydział Architektury. Katedra Kształtowania Środowiska Mieszkaniowego
Tematy:
art culture
architecture
art image
archaic society
element of water
kultura sztuki
architektura
obraz sztuki
społeczeństwo archaiczne
element wody
Opis:
The article studies the historical, cultural and artistic interpretation of the element of water, embodied and visualized in the architectural-artistic images of archaic societies. The analysis of evolutionary and transformational processes have been based on a combination of historical and archaeological reconstructions, cultural, and art-study methods.
Źródło:
Środowisko Mieszkaniowe; 2018, 23; 161-166
1731-2442
2543-8700
Pojawia się w:
Środowisko Mieszkaniowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water film structure during rupture as revealed by MDS image analysis
Autorzy:
Truong, N. T.
Dang, L. X.
Lin, C.-L.
Wang, X.
Miller, J. D.
Powiązania:
https://bibliotekanauki.pl/articles/110251.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
image processing
molecular dynamics simulation
film stability
molecular porosity
Opis:
The structure of thin water films during the rupture process was investigated by a new approach, which combines molecular dynamics simulation (MDS) with image processing analysis. The analysis procedure was developed to convert MDS trajectories to readable 3D images. The water films were studied at different thicknesses by MDS to determine the critical thickness at which the film ruptures. The potential energy of each specific film thickness during the simulation time was analyzed, and the results showed that the potential energy of stable films remained unchanged while the potential energy kept decreasing for films which ruptured during the simulation time. By applying the new procedure, the molecular porosity, which is defined as the void fraction between the volume of molecular pores in the water film and the total volume of the water film, was calculated. The results of molecular porosity for different film thicknesses during the simulation time suggested a critical molecular porosity as 49%. In other words, stable films have a molecular porosity of less than 49%. If a water film has a molecular porosity greater than 49%, rupture occurs during the simulation.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1060-1069
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-Criteria Decision Making of Abrasive Water Jet Machining Process for 2024-T3 Alloy Using Hybrid Approach
Autorzy:
Khudhir, Waqass S.
Abbood, Mohanad Qusay
Shukur, Jalil J.
Powiązania:
https://bibliotekanauki.pl/articles/2204890.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
TOPSIS
entropy
image processing
abrasive water jet machining
Opis:
Abrasive Water Jet Machining (AWJM) is one of the most environmentally friendly non-conventional machining processes, which can be employed to cut hard and thin materials without any thermal effects. In this study, the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) has been combined with the Entropy method and employed to find out the multi-criteria decision-making of process parameters. Experimental investigations have been conducted to evaluate the performance of the AWJM process in terms of surface roughness (Ra) and kerf angle (Ka). The selected process parameters are a stand-off distance (SOD), traverse speed (TS), and abrasive flow rate (AFL), whereas the AL-alloy 2024-T3 was selected as the work piece material. The image process technique has been utilized to measure the values of the Ka. The results demonstrate that the optimal solutions of the AWJM process, which give the smallest value of Ra and minimizes Ka, are 2mm, 20mm/min, and 100 g/min, for SOD, TS, and AFL respectively.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 5; 155--162
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fourier image methods for evolution equations of deep-water waves
Autorzy:
Jankowski, Jan
Leszczyński, Henryk
Powiązania:
https://bibliotekanauki.pl/articles/1955223.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska
Tematy:
wave evolution
Laplace equation
Fourier transform
method of lines
Gauss-Hermite quadrature
Opis:
The velocity potential of the fluid satisfies the Laplace equation with nonlocal boundary conditions on a free surface. This differential problem is transformed to an evolution equation in Fourier variables. The Fourier transform images of boundary functions are approximated by Picard's iterations and the method of lines on meshes related to roots of Hermite polynomials. Due to convolutions of sine and cosine functions the integral terms of Picard's iterations reveal unexpected instabilities for wave numbers in a neighborhood of zero.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2019, 23, 3; 261-268
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On-water video surveillance: data management for a ship identification system
Autorzy:
Popik, Adrian
Zaniewicz, Grzegorz
Wawrzyniak, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/134912.pdf
Data publikacji:
2019
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
video surveillance
cameras
image
processing
ship identification
River Information Services
Opis:
Video surveillance on both marine and inland waters still only plays a mainly auxiliary role in vessel traffic observation and management. The newest technical achievements in visual systems allow camera images to be used in more sophisticated tasks, such as automatic vessel recognition and identification in observed areas. With the use of deep learning algorithms and other artificial intelligence methods, such as rough sets and fuzzy sets, new functions can be designed and implemented in monitoring systems. In this paper the challenges that were encountered and the technology that has been developed in managing video streams are presented as well as the images needed for tests and proper operation of the designed Ship Recognition and Identification System (SHREC). The current technologies, typical setups and capabilities of cameras, with regard to existing on-water video monitoring systems, are also presented. The aspects of collecting the test data in the Szczecin Water Junction area are also described. The main part of the article focuses on presenting the video data pre-processing, storing and managing procedures that have been developed for the purposes of the SHREC system.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 60 (132); 56-63
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remote-sensing observations of coastal sub-mesoscale eddies in the South-Eastern Baltic
Autorzy:
Gurova, E.
Chubarenko, B.
Powiązania:
https://bibliotekanauki.pl/articles/47699.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
remote sensing
submesoscale eddy
coastal zone
Baltic Sea
MODIS satellite image
ASAR satellite image
orography
bottom topography
erosion
oil-field platform
turbidity
coastal water
coloured dissolved organic matter
Źródło:
Oceanologia; 2012, 54, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water immersion vs. air insufflation in canine duodenal endoscopy: is the future underwater?
Autorzy:
Galiazzo, G.
Costantino, F.
Foglia, A.
Bitelli, G.
Romagnoli, N.
Lambertini, C.
Francolini, C.
Gaspardo, A.
Chiocchetti, R.
Pietra, M.
Powiązania:
https://bibliotekanauki.pl/articles/2087281.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dog
duodenoscopy
water immersion
air insufflation
image analysis
nociception
Źródło:
Polish Journal of Veterinary Sciences; 2020, 23, 4; 581-588
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential and use of the googlenet ann for the purposes of inland water ships classification
Autorzy:
Bobkowska, Katarzyna
Bodus-Olkowska, Izabela
Powiązania:
https://bibliotekanauki.pl/articles/1573774.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship classification
image classification
geoinformatics
artificial intelligence
artificial neural network
Opis:
This article presents an analysis of the possibilities of using the pre-degraded GoogLeNet artificial neural network to classify inland vessels. Inland water authorities monitor the intensity of the vessels via CCTV. Such classification seems to be an improvement in their statutory tasks. The automatic classification of the inland vessels from video recording is a one of the main objectives of the Automatic Ship Recognition and Identification (SHREC) project. The image repository for the training purposes consists about 6,000 images of different categories of the vessels. Some images were gathered from internet websites, and some were collected by the project’s video cameras. The GoogLeNet network was trained and tested using 11 variants. These variants assumed modifications of image sets representing (e.g., change in the number of classes, change of class types, initial reconstruction of images, removal of images of insufficient quality). The final result of the classification quality was 83.6%. The newly obtained neural network can be an extension and a component of a comprehensive geoinformatics system for vessel recognition.
Źródło:
Polish Maritime Research; 2020, 4; 170-178
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined impact of summer heat waves and coastal upwelling in the Baltic Sea
Autorzy:
Suursaar, U.
Powiązania:
https://bibliotekanauki.pl/articles/2079092.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
global warming
heat wave
coastal upwelling
water temperature
salinity
satellite image
Finland Gulf
Baltic Sea
Opis:
Under warming climates, heat waves (HWs) have occurred in increasing intensity in Europe. Also, public interest towards HWs has considerably increased over the last decades. The paper discusses the manifestations of the summer 2014 HW and simultaneously occurring coastal upwelling (CU) events in the Gulf of Finland. Caused by an anticyclonic weather pattern and persisting easterly winds, CUs evolved along the southern coast of the Gulf in four episodes from June to August. Based on data from coastal weather stations, 115 days-long measurements with a Recording Doppler Current Profiler (RDCP) oceanographic complex and sea surface temperature (SST) satellite images, the partly opposing impacts of these events are analysed. Occurring on the background of a marine HW (up to 26°C), the CU-forced SST variations reached about 20 degrees. At the 10 m deep RDCP mooring location, a drop from 21.5 to 2.9°C occurred within 60 hours. Salinity varied between 3.6 and 6.2 and an alongshore coastal jet was observed; the statistically preferred westerly current frequently flowed against the wind. Locally, the cooling effect of the CUs occasionally mitigated the overheating effects by the HWs both in the sea and on the marine-land boundary. However, in the elongated channel-like Gulf of Finland, upwelling at one coast is usually paired with downwelling at the opposite coast, and simultaneously or subsequently occurring HWs and CUs effectively contribute to heat transfer from the atmosphere to the water mass. Rising extremes of HWs and rapid variations by CUs may put the ecosystems under increasing stress.
Źródło:
Oceanologia; 2020, 62, 4PA; 511-524
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical and Numerical Investigations of Mould Flux Entrainment into Liquid Steel
Autorzy:
Jowsa, J.
Bielnicki, M.
Cwudziński, A.
Powiązania:
https://bibliotekanauki.pl/articles/353162.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
slag entrainment
Kelvin-Helmholtz instability
water-oil investigations
numerical simulation
particle image velocimetry
Opis:
This paper presents results of model tests, performed in order to analyze phenomenon of slag droplets entrainment into steel in mould, during continuous casting process. The carried out studies took the form of laboratory experiments using physical model, in which – using similarity criteria – the behaviour of interfacial boundary liquid steel-liquid slag has been simulated using water and silicon oils, differing in physicochemical properties. Additionally, based on PIV (Particle Image Velocimetry) measurements and numerical simulations, vector flow field and values of critical velocities, at which observed the occurrence of interfacial boundary silicon oil-water instability have been identified. Based on the carried out investigations, results, that illustrate relationship between critical entrainment velocity and physicochemical properties of oils have been presented.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2043-2050
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral indexation of pixels of MODIS sea surface images for detecting inconstancy of phytopigment composition in water
Autorzy:
Karabashev, G.S.
Powiązania:
https://bibliotekanauki.pl/articles/2078873.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
MODIS satellite image
spectral pixel indexation
sea surface
spatial distribution
Mexico Gulf
Opis:
This paper presents the first results of a new way of using MODIS (Moderate Resolution Imaging Spectroradiometer) sensor data to visualize phytopigment inconstancy in the near-surface layer of water basins. Other sensors of this class alike, the MODIS spectral resolution is too low to reproduce the minimums of reflectance Rrs caused by phytopigments in water. However, MODIS is remarkable for the presence of a channel at 469 nm combined with channels at 412, 443, 488, 531, 547, and 555 nm. This makes it possible to distinguish the spectral limits of preferential light absorption by chlorophyll a (412—469 nm) and by accessory pigments (469—555 nm). These capabilities were realized thanks to spectral pixel indexation (SPI) of MODIS images of the sea surface. The SPI boils down to the fact that a user determines the presence of pigment minima in spectra of every image pixel, finds the sum of the wavelengths of these minima as a WRM code and assigns it to the image pixel as one of its attributes. WRM code = 100 is assigned to pixels free of the minima. Such indexation makes it possible to examine the inconstancy of phytopigments on the background of aquatic environment variability. Application of SPI approach to MODIS images of the Gulf of Mexico and the Baltic Sea made it possible to reveal new patterns of phytopigment dynamics during HABs events.
Źródło:
Oceanologia; 2021, 63, 4; 482-496
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł

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