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Tytuł:
Application of remote sensing methods in geological mapping
Autorzy:
Graniczny, M.
Powiązania:
https://bibliotekanauki.pl/articles/2065882.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
geological mapping
photogeology
remote sensing
Opis:
Aerial photographs are a source of geological information that may be unobtainable elsewhere. If the fullest use is to be made of this information for the purpose of geological mapping, there must be a planned integration of the photogeological work with the field and laboratory investigations. The appearance of the first satellites for civil purposes on the beginning of the 1970s (such as ERTS – Landsat series), of most land areas of the Earth has provided new opportunity for photogeologists. Many areas can now be studied and mapped geologically for which neither adequate maps nor vertical aerial photograps were available. The advantages of the present satellite systems and examples of their application by specialists of the Polish Geological Institute are presented in this paper. Nowadays, it is practically impossible to imagine performing geological mapping without application of remote sensing data and analysis. Development of new technologies is very fast and new borne techniques are coming like permanent scatter interferometry, laser scanning etc. However, we should always remember, that they are only very useful tools to help geologists in their field mapping art and practise.
Źródło:
Przegląd Geologiczny; 2005, 53, 10/2; 907-912
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of ship motion on acoustic remote sensing
Autorzy:
Tegowski, J.
Zielinski, A.
Powiązania:
https://bibliotekanauki.pl/articles/332057.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
ship motion
acoustic remote sensing
Opis:
Ship motion affects quality of acoustic data collected by various acoustic remote sensing systems used for bottom and fisheries surveying. The angular position of an acoustic beam changes in time from its nominal position vertical to sea surface. This motion affects the acoustic returns from the bottom and other targets by changing their intensity and arrival times. In this paper we illustrate these effects on bottom returns obtained using single beam sonar.
Źródło:
Hydroacoustics; 2003, 6; 205-214
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cooperative Spectrum Sensing in Cognitive Radio Networks: A Survey on Machine Learning-based Methods
Autorzy:
Khamayseh, Sundous
Halawani, Alaa
Powiązania:
https://bibliotekanauki.pl/articles/308079.pdf
Data publikacji:
2020
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cognitive radio
cooperative spectrum sensing
IEEE 802.22
machine learning
spectrum sensing
Opis:
The continuous growth of demand experienced by wireless networks creates a spectrum availability challenge. Cognitive radio (CR) is a promising solution capable of overcoming spectrum scarcity. It is an intelligent radio technology that may be programmed and dynamically configured to avoid interference and congestion in cognitive radio networks (CRN). Spectrum sensing (SS) is a cognitive radio life cycle task aiming to detect spectrum holes. A number of innovative approaches are devised to monitor the spectrum and to determine when these holes are present. The purpose of this survey is to investigate some of these schemes which are constructed based on machine learning concepts and principles. In addition, this review aims to present a general classification of these machine learningbased schemes.
Źródło:
Journal of Telecommunications and Information Technology; 2020, 3; 36-46
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
QS – systems communication of Gram-negative bacterial cells
Autorzy:
Ziemichód, Alicja
Skotarczak, Bogumiła
Powiązania:
https://bibliotekanauki.pl/articles/1386164.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
interspecies communication
quorum sensing history
quorum sensing in Vibrio and Pseudomonas aeruginosa
synthesis of AI-2 autoinducer
komunikacja międzygatunkowa
historia quorum sensing
quorum sensing u Vibrio i Pseudomonas aeruginosa
synteza autoinduktora AI-2
Opis:
Quorum sensing (QS) is a communication mechanism used by bacteria to recognize cell population density fluctuations and control gene expression, which is a critical role both in intra- and interspecies communication and controls microbe-host interactions. QS is the process in which the bacterial cells detect threshold concentration of signaling molecules in the external environment, and then after having exceeded this allowable threshold, they respond accordingly and modify their behavior by altering the expression of their genes. Regulation of gene expression in response to the density of bacterial cells in a population is a key phenomenon in the mechanism of QS and it is used by both Gram-negative and Gram-positive bacteria. In Gram-negative bacteria LuxR protein plays a key role in QS system as a type of transcription regulators and participates in a variety of biological behaviors with LuxI protein and signal molecules, including those encoding virulence factors and antibiotics biosynthesis, plasmid transfer, bioluminescence, and biofilm formation. New researches which highlight the unusual signaling molecules, novel regulatory components and heterogeneity in the QS system of Gram-negative bacteria are presented in this paper.
Quorum sensing (QS) jest mechanizmem komunikacji używanym przez bakterie do rozpoznawania zmian w zagęszczeniu populacji i kontroli ekspresji genów, który jest ważny zarówno w komunikacji wewnątrz jak i pomiędzy gatunkowej oraz kontroluje interakcje bakteria- -gospodarz. QS jest procesem, w którym komórki bakteryjne wykrywają progową koncentrację cząsteczek sygnałowych w środowisku zewnętrznym, a następnie, po przekroczeniu tego progu, odpowiadają swoiście i modyfikują swoje zachowanie przez zmiany w ekspresji genów. Regulacja ekspresji genów w odpowiedzi na gęstość komórek bakteryjnych w populacji jest kluczowym fenomenem w mechanizmie QS i jest stosowana zarówno przez bakterie Gramujemne, jak i Gram-dodatnie. U bakterii Gram-ujemnych białko LuxR odgrywa kluczową rolę w systemie QS jako rodzaj regulatora transkrypcji oraz wspólnie z białkiem LuxI i cząsteczkami sygnałowymi uczestniczy w różnych procesach biologicznych takich jak kodowanie czynników wirulencji i biosyntezie antybiotyków, w transferze plazmidów, bioluminescencji i formowaniu biofilmu. W pracy zaprezentowano nowe badania, które przybliżają te niezwykłe cząsteczki sygnałowe, nowe komponenty regulatorowe i heterogenność QS-systemu u bakterii Gram-ujemnych.
Źródło:
Acta Biologica; 2017, 24; 39-49
2450-8330
2353-3013
Pojawia się w:
Acta Biologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semi-PROPELLER Compressed Sensing Image Reconstruction with Enhanced Resolution in MRI
Autorzy:
Malczewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/226988.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MRI
super-resolution
compressed sensing
Opis:
Magnetic Resonance Imaging (MRI) reconstruction algorithm using semi-PROPELLER compressed sensing is presented in this paper. It is exhibited that introduced algorithm for estimating data shifts is feasible when super- resolution is applied. The offered approach utilizes compressively sensed MRI PROPELLER sequences and improves MR images spatial resolution in circumstances when highly undersampled k-space trajectories are applied. Compressed sensing (CS) aims at signal and images reconstructing from significantly fewer measurements than were traditionally thought necessary. It is shown that the presented approach improves MR spatial resolution in cases when Compressed Sensing (CS) sequences are used. The application of CS in medical modalities has the potential for significant scan time reductions, with visible benefits for patients and health care economics. These methods emphasize on maximizing image sparsity on known sparse transform domain and minimizing fidelity. This diagnostic modality struggles with an inherently slow data acquisition process. The use of CS to MRI leads to substantial scan time reductions [7] and visible benefits for patients and economic factors. In this report the objective is to combine Super-Resolution image enhancement algorithm with both PROPELLER sequence and CS framework. The motion estimation algorithm being a part of super resolution reconstruction (SRR) estimates shifts for all blades jointly, utilizing blade-pair correlations that are both strong and more robust to noise.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 2; 211-217
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compressed sensing in MRI : mathematical preliminaries and basic examples
Autorzy:
Błaszczyk, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/146500.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
compressed sensing
magnetic resonance imaging
sampling theory
sparsity
Opis:
In magnetic resonance imaging (MRI), k-space sampling, due to physical restrictions, is very time- -consuming. It cannot be much improved using classical Nyquist-based sampling theory. Recent developments utilize the fact that MR images are sparse in some representations (i.e. wavelet coeffi cients). This new theory, created by Candès and Romberg, called compressed sensing (CS), shows that images with sparse representations can be recovered from randomly undersampled k-space data, by using nonlinear reconstruction algorithms (i.e. l1-norm minimization). Throughout this paper, mathematical preliminaries of CS are outlined, in the form introduced by Candès. We describe the main conditions for measurement matrices and recovery algorithms and present a basic example, showing that while the method really works (reducing the time of MR examination), there are some major problems that need to be taken into consideration.
Źródło:
Nukleonika; 2016, 61, 1; 41-43
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dual Port Antenna Combining Sensing and Communication Tasks for Cognitive Radio
Autorzy:
Nachouane, H.
Najid, A.
Tribak, A.
Riouch, F.
Powiązania:
https://bibliotekanauki.pl/articles/226370.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cognitive radio
microstrip antenna
UWB
coplanar waveguide
sensing and communication tasks
sensing antenna
Opis:
Dynamic spectrum access has been proposed as the effective solution to overcome the spectrum scarcity issue, supported by cognitive radio technology. Sensing and communication functions are both the most important tasks in cognitive radio systems. In this paper, an antenna system combining sensing and communication tasks is proposed to be integrated into cognitive radio front-ends. The sensing task is performed by means of an ultra-wideband quasi-omnidirectional antenna. Whilst the communication task is ensured by using a narrowband antenna. Both antennas have been designed on the same layer of an FR4 substrate, for manufacturing cost constraint. Therefore, the isolation between them must take into consideration. The measured mutual coupling of less than -18 dB is achieved over the whole impedance bandwidth. The proposed sensing antenna covers a wide range frequency bands ranging from 2 to 5.5 GHz. While the communication antenna operates at 2.8 GHz, and by adding inductors to the antenna, the resonant frequency can be tuned from 2.6 to 2.7 GHz. The whole antenna system was designed, fabricated, and tested. Measurement and simulation results prove the feasibility of the proposed structure for cognitive radio applications.
Źródło:
International Journal of Electronics and Telecommunications; 2016, 62, 2; 121-127
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drought Detection by Application of Remote Sensing Technology and Vegetation Phenology
Autorzy:
Uttaruk, Y.
Laosuwan, T.
Powiązania:
https://bibliotekanauki.pl/articles/125427.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
drought detection
remote sensing
vegetation phenology
Opis:
Drought is a natural phenomenon as it often occurs in the area of Yasothon province, northeastern of Thailand. It causes effects on vegetation condition in the area. Drought information might be useful for local government to prepare for prevention and mitigation plan in the future. For this reason, the primary objective of the research was to conduct the examination of this province to find severe drought years. Firstly, the researcher needed to find Normalized Differences Vegetation Index (NDVI) and Vegetation Condition Index (VCI) by analyzing monthly Landsat data acquired at different periods of time from January to December 2014, 2015, and 2016, covering 4,096 km2. Then, the researcher needed to find relationship between VCI and monthly rainfall represented in term of space and time. As results, VCI and its relationship with monthly rainfall were congruent. VCI showed that the drought area was 33.87% or 1,387.32 km2 of studied area in 2014, 16.24% or 665.19 km2 of studied area in 2015 and 27.95% or 1,144.83 km2 of studied area in 2016. Therefore, the most and the least severe drought years were 2014, 2016, and 2015 respectively.
Źródło:
Journal of Ecological Engineering; 2017, 18, 6; 115-121
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilisation of IoT and sensing for machine tools
Autorzy:
Fujishima, Makoto
Mori, Masahiko
Narimatsu, Koichiro
Irino, Naruhiro
Powiązania:
https://bibliotekanauki.pl/articles/99978.pdf
Data publikacji:
2019
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
sensing
IoT
machine tools
automation
Opis:
Strong requirements for automation in the production processes using machine tools have been increasing due to lack of high-skilled machining engineers. Automation used to be utilised in mass production, but it is also necessary in medium- to low-volume production recently. Next requirements will be monitoring or sensing functions to make the following possible: prompt service when the machine stops; detection of abnormality before the machine breaks down; and compensation of thermal displacement to ensure machining accuracy. These now need to be performed automatically in place of operators so that abnormality can be detected during machining operation. In this paper core technologies to support automation system will be discussed which are operation monitoring, predictive maintenance, sensing interface and thermal displacement compensation as a sensing application.
Źródło:
Journal of Machine Engineering; 2019, 19, 1; 38-47
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratory testing of velocity sensing in a magnetorheological damper with power generation
Autorzy:
Sapiński, B.
Powiązania:
https://bibliotekanauki.pl/articles/387253.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
MR damper
power generator
voltage
velocity
sensing
Opis:
The study summarises the results of experimental examination of velocity sensing capability in a prototype of a magnetorheological damper with power generation (MRD). The device has two main components: an electromagnetic power generator and an MR damper. The study outlines the structure of the device with the main focus on the generator part, and provides results of tests performed under the idle run. The discussion of demonstrates the potentials of MRD action as a velocity-sign sensor and presents key issues which need to be addressed to enable its real life applications.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 3; 186-189
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laserowe wykrywanie obiektów podwodnych
Underwater remote laser sensing
Autorzy:
Wojtanowski, J.
Zygmunt, M.
Gawlikowski, A.
Młodzianko, A.
Piotrowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/208488.pdf
Data publikacji:
2009
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
teledetekcja podwodna
LIDAR
propagacja
woda morska
teledetekcja laserowa
lidar
underwater remote sensing
laser propagation
sea water
laser remote sensing
Opis:
W pracy przedstawiono wyniki analiz związanych z możliwością zastosowania promieniowania laserowego do zdalnej detekcji prowadzonej w środowisku wody morskiej. W ramach projektu badawczego, realizowanego w Instytucie Optoelektroniki WAT, opracowano układ dwubarwnego dalmierza laserowego, który posłuży do wykonania badań i weryfikacji przyjętych modeli teoretycznych. Uwzględniono przy tym zarówno analityczne wyznaczenie mocy sygnału tła jak i mocy użytecznego sygnału echa. Omówiono wiele zjawisk związanych z propagacją promieniowania laserowego w wodzie morskiej a także wpływ jej najważniejszych własności optycznych na możliwości prowadzenia podwodnej teledetekcji. Dla założonej realizacji sprzętowej przedstawiono obliczenia związane z wyznaczeniem stosunku sygnał-szum dla różnych warunków prowadzonej teledetekcji oraz dokonano określenia maksymalnych zasięgów skutecznej pracy dalmierza laserowego do pomiarów podwodnych.
Theoretical and practical aspects of laser application in the field of underwater remote sensing are presented. Water characteristics concerning electromagnetic radiation propagation have been considered. Analytical approach covers both "echo" signal reflected from an underwater object and background noise signal level generated mainly by the sunlight and diffuse atmospheric illumination. Considering the real configuration of the equipment and its technical specification, signal-to-noise ratio level was computed for some specific environmental conditions. It enabled to evaluate the maximum distance ranges of underwater remote sensing. The results form the basis for practical applications of Lidar system developed at the Institute of Optoelectronics of the Military University of Technology in Warsaw.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2009, 58, 1; 153-175
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Początki teledetekcji środowiska w Polsce
Origin of remote sensing of environment in Poland
Autorzy:
Olędzki, J. R.
Powiązania:
https://bibliotekanauki.pl/articles/132194.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Geograficzne
Tematy:
teledetekcja
Pracownia Interpretacji Zdjęć Lotniczych
Klub Teledetekcji Środowiska PTG
remote sensing
Laboratory of Aerial Photos Interpretation
remote sensing of Environment Club PGS
Opis:
Years go by. Time obliterates the memory of people and events that they initiated or inspired. Events, being fruits of efforts made by individuals, frequently driven by fascination, necessity or even chance, build the history of different spheres of social life, and in the case which is of interest to us – of the discipline which is now known as remote sensing. This sketch aims to outline the origin of remote sensing in Poland and the milestones in its development during the past five decades. It does not intend to offer a detailed substantive analysis of various studies, directions of research or numerous practical applications. In the sketch’s final part, the programme of training specialists in geinformatics and remote sensing offered at the University of Warsaw is shortly discussed. In 2009, 45 years passed since the conference of geographers and specialists in aerial photographs interpretation which was held in Warsaw, at the Institute of Geography, Faculty of Biology and Earth Sciences of the University of Warsaw. The conference was organised by the Laboratory of Aerial Photographs Interpretation at the Chair of Regional Geography of the Institute of Geography. The aim of the meeting – which took place in May 1964 – was to familiarise the participants with the findings of research and didactic work at academic centres abroad and at home, in order to develop a new and uniform curriculum for all geography specialisations in Poland. In addition to that, directions of research work conducted by individual laboratories of aerial photograph interpretation were also discussed. The first classes in remote sensing were conducted at geographical studies at the University of Warsaw, specialisation of regional geography, as early as the academic year 1960/1961. Similar classes were also held at the University of Wrocław, Adam Mickiewicz University in Poznań and Maria Curie Skłodowska University in Lublin. In Poland, aerial photography started to be in use from the very first years of independence. In 1921-1924, photoplans on the scale of 1:10 000 covering an area of 3000 km² were made for the Polish-Soviet border areas. 1930 saw the setting up of a specialised enterprise, FOTOLOT. The establishment of the Polish Photogrammetic Society in 1930 was a momentous event as its activity played an important role in the development of photogrammetric methods based on aerial photographs, catering to different needs of the national economy. The most significant achievements in the years 1920-1939 included: a 1931 study by Roman Gryglaszewski, which described the methodology of taking and interpreting aerial photographs for land improvement works on the rivers of the Polesie region, and a 1935 study by Roman Feliński on the analysis of cities, villages and spas in the settlement organisation of the country, in which he highlighted the role of aerial photographs in studies on the country’s spatial development. In 1937-1939, aerial photographs were used in land classification and forestry. We should also mention the work of the Polish geologist Stanisław Zuber, who conducted geological surveys on the Caspian Sea and was a pioneer of using aerial photographs in geology and geotectonic research. In the inter-war period, the Lvov Polytechnic Professor Kasper Weigl, organiser of aerial photography courses, was the most eminent personality in the teaching of remote sensing. Some aerial photographs taken by the German army survived until today from the times of the Second World War; one of such photographs is an aerial photograph of Warsaw taken on 5 August 1944, at the very beginning of the Warsaw Uprising. In it, one can see areas engulfed by fi res and military operations, and the area of the ghetto, razed to the ground, in the form of a light tone. The first aerial photographs after the Second World War were taken already in 1945. The first years after the War, and later, until the end of the 1950s, were not easy for the development of remote sensing in Polish geography despite the systematic character of aerial photography of Poland at the time. In 1957, Bogodar Winid set a long-term plan for himself to change the neutral to negative approach of the geographers’ community to a new research methodology – interpretation of aerial photographs. The plan included familiarisation with the theoretical foundations of photointerpretation, development of materials for this type of classes, gradual training of specialists, gradual introduction of classes in interpretation of aerial photographs for students specialising in regional geography, and later in other specialisations and disciplines, conducting research in this field, and starting cooperation with state bodies and institutions to familiarise them with the socalled “aeromethods”. Looking at this programme fifty years later, we can say that – probably mostly owing to Bogodar Winid’s outstanding drive and energy – this programme was implemented in full. In 1966, interpretation of aerial photographs was made a compulsory subject in geographical studies. To coordinate the development of photointerpretation, on 23 October 1964 a specialised body, the Photointerpretation Committee, was set up as part of the Polish Geographical Society (PTG). A specialised series entitled Fotointerpretacja w geografii [Photointerpretation in geography] was initiated for scientific exchange purposes; currently, it is known as the Teledetekcja Środowiska [Remote sensing] series. By the end of 2008, a total of 40 volumes with 480 papers was published. The Photointerpretation Committee, later transformed into the Remote Sensing Club of the Polish Geographical Society, in the years 1964-2009 organised 19 nation-wide conferences on issues of photointerpretation and remote sensing. The range of remote sensing applications was expanded to other areas ane institutions owing to cooperation with government institutions, as a result of which OPOLIS, the Centre for Processing Aerial Photographs and Satellite Images, was set up as a part of the Institute of Geodesy and Cartography.
Źródło:
Teledetekcja Środowiska; 2009, 41; 5-22
1644-6380
Pojawia się w:
Teledetekcja Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biofilm and Quorum Sensing in Archaea
Autorzy:
Pawlikowska-Warych, Małgorzata
Tokarz-Deptuła, Beata
Czupryńska, Paulina
Deptuła, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/1386313.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
Archaea
biofilm
environment
quorum sensing
Archea
środowisko
Opis:
In the article, we presented a brief description of the Archaea, considering their structure, physiology and systematics. Based on the analysis of the literature, we bring closer the mechanism of biofilm formation, including extracellular polymeric substances as well as cellular organelles, such as archaella, pili and ‘hami’. The method of forming a biofilm depends on the type of Archaea and the environment in which it naturally lives. We are also introducing the phenomenon of quorum-sensing, as a mechanism of communication of Archaea in the environment. This phenomenon corresponds to similar molecules as bacteria, namely acylated homoserines lactones, QS peptides, autoinducer-2 and -3 and others. In the case of biofilms and the occurrence of the phenomenon of quorum sensing, it can be concluded that these phenomena are very important for the life of Archaea. The phenomena described seem to be conservative, because both in Archaea and Bacteria are regulated by the same mechanisms.
W artykule przedstawiamy opis Archaea, z uwzględnieniem ich budowy, fizjologii i systema- tyki. Na podstawie piśmiennictwa przybliżamy mechanizm tworzenia biofilmu wraz z poza-komórkowymi substancjami polimerowymi, a także typowe tylko dla archeonów organelle komórkowe, takie jak archaella, pili i „hami”. Metoda tworzenia biofilmu zależy od rodzaju Archaea i środowiska, w którym naturalnie żyje. Przybliżamy również zjawisko quorum--sensing, jako mechanizm komunikacji Archaea w środowisku. Za zjawisko to odpowiadają cząsteczki chemiczne podobne do tych u bakterii, a mianowicie acylowany lakton homoseryny, peptyd QS, autoinduktor-2 i -3 oraz inne. Opisywane zjawiska, zarówno tworzenie biofilmu jak i quorum-sensing są istotne dla życia archeonów. Opisane zjawiska wydają się konserwatywne, ponieważ zarówno u archeonów, jak i bakterii są regulowane przez te same mechanizmy.
Źródło:
Acta Biologica; 2019, 26; 35-44
2450-8330
2353-3013
Pojawia się w:
Acta Biologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water in the city and remote sensing
Autorzy:
Tatosova, L.
Sinka, K.
Novotna, B.
Huska, D.
Powiązania:
https://bibliotekanauki.pl/articles/2049666.pdf
Data publikacji:
2021
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
remote sensing
urbanized area
LAI
water management
accumulation
Opis:
At present, climate change is particularly evident in areas heavily used by man. Such localities are mainly urbanized areas. With the increment in urban area and construction related to urban development, the hydrological regime of such sites is disrupted. When the natural character of the surface has changed, where precipitation, evapotranspiration and outflow of water from the area has been balanced, there is now an increase in territories that are impermeable and caused almost 100% runoff. The influence of the built-up area on the temperature increase in urbanized areas in comparison with the surrounding landscape is also known as a thermal island. The identification of the current status and possible potential interventions in the water regime of cities is provided by the possibility of using information obtained from the satellite monitoring of the Earth's surface. The range of areas in urbanized areas contributing to runoff can be ascertained by remote sensing, where in particular using multispectral images, where it is possible to distinguish surface characteristics using LAI and controlled image classification. At the same time, it is possible to identify areas that could be used to create space for rainwater infiltration and its accumulation below the surface. The paper evaluates the extent of changes in land use in Nitra from 1954 to 2017. The growth of areas with minimal infiltration capacity in the area of the Slovak University of Agriculture is identified. Possibilities of use of rainwater and their accumulation in the monitored area are analyzed.
Źródło:
Environment, Earth and Ecology; 2021, 5, 1; 26-38
2543-9774
2451-4225
Pojawia się w:
Environment, Earth and Ecology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy-based spectrum sensing with copulas for cognitive radios
Autorzy:
Ilgin, F. Y.
Powiązania:
https://bibliotekanauki.pl/articles/201847.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy-based sensing
cognitive radio
copula theory
Neyman Pearson
spectrum management
Opis:
In this study, an energy-based spectrum sensing method combined with copula theory is proposed for cognitive radio systems. In the proposed spectrum sensing model, cognitive radio users first make their own local spectrum decision with energy-based spectrum sensing. Then, they forward their decision to the fusion center. In the fusion center, this decision is compared with the threshold value determined by copula theory and global spectrum decision is made. The test statistic at the fusion center were obtained with the Neyman Pearson approach. Thus, the fusion rule was created for the fusion center and necessary simulation studies were performed. According to the results of the simulation studies, the proposed detection method showed better results than the traditional energy based detection method.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 829-834
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł

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