88 research outputs found

    Reconstruction of sub-threshold events of cosmic-ray radio detectors using an autoencoder

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    Radio detection of air showers produced by ultra-high energy cosmic rays is a cost-effective technique for the next generation of sparse arrays. The performance of this technique strongly depends on the environmental background, which has different constituents, namely anthropogenic radio frequency interferences, synchrotron galactic radiation and others. These components have recognizable features, which can help for background suppression. A powerful method for handling this is the application of convolution neural networks with a specific architecture called autoencoder. By suppressing unwanted signatures, the autoencoder keeps the signal-like ones. We have successfully developed and trained an autoencoder, which is now applied to the data from Tunka-Rex. We show the procedures of the training and optimization of the network including benchmarks of different architectures. Using the autoencoder, we improved the standard analysis of Tunka-Rex in order to lower the threshold of the detection. This enables the reconstructing of sub-threshold events with energies lower than 0.1 EeV with satisfactory angular and energy resolutions

    Development of HW components "smart Home automation"

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    Teoretick├í ─Ź├íst obsahuje stru─Źn├Ż popis smart technologi├ş. Jsou zde pops├íny jejich p┼Ö├şnosy, hrozby a mo┼żnosti vyu┼ż├şv├ín├ş v r┼»zn├Żch odv─Ťtv├ş. D┼»raz se pak klade p┼Öedev┼í├şm na vyu┼ż├şv├ín├ş chytr├Żch technologi├ş v dom├ícnostech. V souvislosti s chytrou dom├ícnost├ş je zde p┼Öedstaven i Open-Source syst├ęm Home Assistant a jeho dopln─Ťk ESP Home, kter├Ż umo┼ż┼łuje do tohoto syst├ęmu integrovat u┼żivatelem vytvo┼Öen├ę chytr├ę komponenty. Praktick├í ─Ź├íst se zab├Żv├í testov├ín├şm p┼Öipojitelnosti r┼»zn├Żch typ┼» perif├ęri├ş (senzor┼», displej┼», sb─Ťrnic, IO vstup┼» a v├Żstup┼» atd.) a n├ísledn├Żm v├Żvojem vlastn├şch chytr├Żch komponent. Tyto chytr├ę komponenty jsou pak demonstrov├íny na vytvo┼Öen├ęm testovac├şm stanovi┼íti se syst├ęmem Home Assistant.Obh├íjenoThe diploma thesis deals with the development of smart devices designed for the Home Assistant system. The theoretical part contains a brief description of smart technologies. Their benefits, threats and possibilities of use in various industries are described here. The emphasis is then mainly on the use of smart technologies in households. In connection with the smart home, the OpenSource system Home Assistant and its addon ESP Home, which allows the integration of user-created smart components into this system, are also presented here. The practical part deals with testing the connectivity of various types of peripherals (sensors, displays, buses, IO inputs and outputs, etc.) and the subsequent development of own smart components. These smart components are then demonstrated on the created testing station with the Home Assistant system

    Development of HW components "smart Home automation"

    No full text
    Teoretick├í ─Ź├íst obsahuje stru─Źn├Ż popis smart technologi├ş. Jsou zde pops├íny jejich p┼Ö├şnosy, hrozby a mo┼żnosti vyu┼ż├şv├ín├ş v r┼»zn├Żch odv─Ťtv├ş. D┼»raz se pak klade p┼Öedev┼í├şm na vyu┼ż├şv├ín├ş chytr├Żch technologi├ş v dom├ícnostech. V souvislosti s chytrou dom├ícnost├ş je zde p┼Öedstaven i Open-Source syst├ęm Home Assistant a jeho dopln─Ťk ESP Home, kter├Ż umo┼ż┼łuje do tohoto syst├ęmu integrovat u┼żivatelem vytvo┼Öen├ę chytr├ę komponenty. Praktick├í ─Ź├íst se zab├Żv├í testov├ín├şm p┼Öipojitelnosti r┼»zn├Żch typ┼» perif├ęri├ş (senzor┼», displej┼», sb─Ťrnic, IO vstup┼» a v├Żstup┼» atd.) a n├ísledn├Żm v├Żvojem vlastn├şch chytr├Żch komponent. Tyto chytr├ę komponenty jsou pak demonstrov├íny na vytvo┼Öen├ęm testovac├şm stanovi┼íti se syst├ęmem Home Assistant.Obh├íjenoThe diploma thesis deals with the development of smart devices designed for the Home Assistant system. The theoretical part contains a brief description of smart technologies. Their benefits, threats and possibilities of use in various industries are described here. The emphasis is then mainly on the use of smart technologies in households. In connection with the smart home, the OpenSource system Home Assistant and its addon ESP Home, which allows the integration of user-created smart components into this system, are also presented here. The practical part deals with testing the connectivity of various types of peripherals (sensors, displays, buses, IO inputs and outputs, etc.) and the subsequent development of own smart components. These smart components are then demonstrated on the created testing station with the Home Assistant system

    Identification complexity of critically endangered Squatina squatina (Linnaeus, 1758) and Squatina aculeata Cuvier, 1829 in the Mediterranean Sea (Turkey)

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    Sharks and rays, besides their economic importance, are ecologically important organisms with a diverse group. After a pregnant Squatina sp. was captured as by-catch, Akyol et al. (2015) published this species as Squatina squatina while the COI and 16S rDNA analysis demonstrated that the species is S. aculeata. This complexity revealed that utilizing morphologic identification solely might not be enough to distinguish these two Squatina species accurately. We aim to compare morphologic and molecular techniques during species identification of critically endangered S. squatina and S. aculeata. Two different gene regions were used for molecular identification of 3 Squatina specimens obtained from the Aegean coasts of Turkey. Sequence analysis of two gene regions was conducted after PCR analysis. An aligned data set was used for creating phylogenetic trees. The results demonstrated that the previously identified S. squatina specimen was revealed as S. aculeata after molecular analysis. Two other specimens which were morphologically identified as S. squatina demonstrated the same results both with molecular and morphological analysis. Our results suggest that adopting morphological identification as the only tool is not enough to accurately determine the Squatina species; both morphological and molecular tools should be used for taxonomical identification of shark species, especially the endangered ones, to assure their conservation status

    Effect of various ignition timings on combustion process and performance of gasoline engine

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    This article deals with the effect of the ignition timing on the output parameters of a spark-ignition engine. The main assessed parameters include the output parameters of the engine (engine power and torque), cylinder pressure variation, heat generation and burn rate. However, the article also discusses the effect of the ignition timing on the temperature of exhaust gases, the indicated mean effective pressure, the combustion duration, combustion stability, etc. All measurements were performed in an engine test room in the Department of Technology and Automobile Transport at Mendel University in Brno, on a four-cylinder AUDI engine with a maximum power of 110 kW, as indicated by the manufacturer. To control and change the ignition timing of the engine, a fully programmable Magneti Marelli control unit was used. The experimental measurements were performed on 8 different ignition timings, from 18 CA to 32 CA BTDC at wide throttle open and a constant engine speed (2500 rpm), with a stoichiometric mixture fraction. The measurement results showed that as the ignition timing increases, the engine power and torque also increase. The increase in these parameters is a reflection of higher pressure in the cylinder, the maximum value of which is achieved at a higher ignition timing near top dead centre in thepower stroke. In these conditions we can expect higher engine efficiency. It was also found that the combustion is more stable with a higher value of ignition timing. No significant difference was found in the combustion duration.O

    Habitat features and their influence on the restoration potential of marine habitats in Europe

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    To understand the restoration potential of degraded habitats, it is important to know the key processes and habitat features that allow for recovery after disturbance. As part of the EU (Horizon 2020) funded MERCES project, a group of European experts compiled and assessed current knowledge, from both past and ongoing restoration efforts, within the Mediterranean Sea, the Baltic Sea, and the North-East Atlantic Ocean. The aim was to provide an expert judgment of how different habitat features could impact restoration success and enhance the recovery of marine habitats. A set of biological and ecological features (i.e., life-history traits, population connectivity, spatial distribution, structural complexity, and the potential for regime shifts) were identified and scored according to their contribution to the successful accomplishment of habitat restoration for five habitats: seagrass meadows, kelp forests, Cystoseira macroalgal beds, coralligenous assemblages and cold-water coral habitats. The expert group concluded that most of the kelp forests features facilitate successful restoration, while the features for the coralligenous assemblages and the cold-water coral habitat did not promote successful restoration. For the other habitats the conclusions were much more variable. The lack of knowledge on the relationship between acting pressures and resulting changes in the ecological state of habitats is a major challenge for implementing restoration actions. This paper provides an overview of essential features that can affect restoration success in marine habitats of key importance for valuable ecosystem services

    Habitat mapping in the European Seas - is it fit for purpose in the marine restoration agenda?

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    Este art├şculo contiene 10 p├íginas, 10 figuras.As habitat mapping is crucially important for developing effective management and restoration plans, the aim of this work was to produce a census of available map resources at the European scale focusing on: a) key marine habitats; b) degraded habitats; c) human activities and pressures acting on degraded habitats, and d) the restoration potential of degraded habitats. Almost half of the 580 map records were derived from grey literature and web resources but contained no georeferenced files for download, thus limiting further use of the data. Biogeographical heterogeneity was observed and varied between the type and quality of information provided. This variability was mainly related to differences in research efforts and stakeholder focus. Habitat degradation was assessed in only 28% of the map records and was mostly carried out in a qualitative manner. Less than half of the map records included assessments on the recovery/restoration potential of the degraded habitats, with passive restoration by removal of human activities being the most commonly recommended measure. The current work has identified several gaps and challenges both in the thematic and geographic coverage of the available map resources, as well as in the approaches implemented for the harmonized assessment of habitat degradation. These should guide future mapping initiatives in order to more comprehensively support and advise the marine habitat restoration agenda for better meeting the objectives set in relevant policy documents and legislative acts in Europe.This research has received funding from the European UnionÔÇÖs Horizon 2020, research and innovation programme under grant agreement No 689518 (MERCES: Marine Ecosystem Restoration in Changing European Seas). TM was supported by Program Investigador FCT, Portugal (IF/01194/2013).Peer reviewe

    Biology of Shortfin Mako Shark (Isurus oxyrinchus Rafinesque, 1810) from the Eastern Mediterranean

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    Shortfin mako, Isurus oxyrinchus Rafinesque, 1810, is one of the commercially and recreationally important shark species in the world. Still knowledge on its biology and status is limited in the eastern Mediterranean. Three individuals were caught from Turkish waters. Two individuals (one female and one male) stomach contents, morphological measurements and femaleÔÇÖ gonad histology were studied. According to the results from macroscopic examination and gonad histology, the female was a Stage 1-immature, and smallest female ever recorded from Turkish waters. in addition, phylogenetic network of mitochondrial haplotypes was constructed for all three individuals. the phylogenetic network analysis supported that the species having a metapopulation as mentioned in previous studies. Since every information is critical for development of conservation actions aiming endangered species, we believe that our study will contribute to the limited knowledge on I. oxyrinchus biology and reproduction habits in Eastern MediterraneanK─▒sa y├╝zge├žli mako k├Âpekbal─▒─č─▒, Isurus oxyrinchus Rafinesque, 1810, d├╝nyadaki ticari ve sportif a├ž─▒dan ├Ânemli olan k├Âpekbal─▒─č─▒ t├╝rlerinden biridir. T├╝r├╝n, Do─ču Akdeniz'deki biyolojisi ve durumu konusundaki bilgiler hala s─▒n─▒rl─▒d─▒r. ├çal─▒┼čmada, T├╝rkiye k─▒y─▒lar─▒ndan ├╝├ž birey yakalanm─▒┼čt─▒r. Yakalanan iki bireyin (bir di┼či ve bir erkek) morfolojik ├Âl├ž├╝mleri yap─▒lm─▒┼č, mide i├žeri─či ve di┼či gonad histolojisi incelenmi┼čtir. Makroskopik inceleme ve gonad histolojisi sonu├žlar─▒na g├Âre; di┼či birey, a┼čama-1 (olgunla┼čmam─▒┼č) safhas─▒nda ve ┼čimdiye kadar T├╝rk sular─▒ndan kaydedilen en k├╝├ž├╝k di┼či bireydir. Ayr─▒ca, her ├╝├ž birey i├žin filogenetik mitokondriyal haplotip a─č olu┼čturulmu┼čtur. Yap─▒lan bu filogenetik a─č analizi, ├Ânceki ├žal─▒┼čmalarda belirtildi─či gibi bir metapop├╝lasyona sahip t├╝rlerin desteklendi─čini g├Âstermektedir. Her bilgi, nesli t├╝kenmekte olan t├╝rlere y├Ânelik koruma eylemlerinin geli┼čtirilmesi i├žin kritik ├Âneme sahiptir. ├çal─▒┼čmam─▒z─▒n, Do─ču Akdeniz'deki I. oxyrinchus biyolojisi ve ├╝reme al─▒┼čkanl─▒klar─▒ hakk─▒ndaki s─▒n─▒rl─▒ bilgiye katk─▒ yapaca─č─▒na inanmaktay─▒z

    Current Status and New Challenges of The Tunka Radio Extension

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    The Tunka Radio Extension (Tunka-Rex) is an antenna array spread over an area of about 1~km2^2. The array is placed at the Tunka Advanced Instrument for cosmic rays and Gamma Astronomy (TAIGA) and detects the radio emission of air showers in the band of 30 to 80~MHz. During the last years it was shown that a sparse array such as Tunka-Rex is capable of reconstructing the parameters of the primary particle as accurate as the modern instruments. Based on these results we continue developing our data analysis. Our next goal is the reconstruction of cosmic-ray energy spectrum observed only by a radio instrument. Taking a step towards it, we develop a model of aperture of our instrument and test it against hybrid TAIGA observations and Monte-Carlo simulations. In the present work we give an overview of the current status and results for the last five years of operation of Tunka-Rex and discuss prospects of the cosmic-ray energy estimation with sparse radio arrays.Comment: Proceedings of E+CRS 201
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