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Wyświetlanie 1-15 z 387
Tytuł:
Bottom Sediments as an Element of the Krąpiel River Ecosystem
Autorzy:
Raczyńska, M.
Machula, S.
Łukaszewicz, P.
Raczyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/125464.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
bottom sediments
Krapiel river
breeding of salmonids
bottom fauna
Opis:
Research on the structure of sediments was carried out in 2015 in the river Krąpiel and its tributaries. The main objectives of this study were to classify the types of sediments with grain size analyzing according three different criteria, as well as influence of the substrate on the abundance and diversity of macrobenthic organisms, and to determine the quality of the ground for natural breeding of salmonids. It was found that according to Polish standards, bottom sediments of the Krąpiel river and its tributaries belong to the coarse – gravel type or sandy – gravel type, whereas according to the method used in Anglo-Saxon countries – these are sandy sediments. It was also shown that the grain size of bottom sediments of the Krąpiel river and its tributaries determine friendly living environment for macroinvertebrates and for breeding salmonids.
Źródło:
Journal of Ecological Engineering; 2016, 17, 2; 121-127
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial Presentation of Sea Bottom Using EMIF Format
Autorzy:
Dupuy, R.
Makar, A.
Powiązania:
https://bibliotekanauki.pl/articles/320821.pdf
Data publikacji:
2010
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
sea bottom
S-57
Opis:
In the paper, there is presented a problem of search object drift during SAR operation. Presented method of conducting search takes into account probability of containment (POC) of searched object inside search area. Its also consider available endurance of SAR unit. Described method allows for achieving as good as possible average POC.
Źródło:
Annual of Navigation; 2010, 16; 25-31
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of Objects Buried in the Sea Bottom with the Use of Parametric Echosounder
Autorzy:
Kozaczka, E.
Grelowska, G.
Kozaczka, S.
Szymczak, W.
Powiązania:
https://bibliotekanauki.pl/articles/177224.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sea bottom
sea bottom acoustic
buried objects
Opis:
The paper contains results of a in situ research main task of which was to detect objects buried, partially or completely, in the sea bottom. Object detecting technologies employing acoustic wave sources based on nonlinear interaction of elastic waves require application of parametric sound sources. Detection of objects buried in the sea bottom with the use of classic hydroacoustic devices such as the sidescan sonar or multibeam echosounder proves ineffective. Wave frequencies used in such devices are generally larger than tens of kHz. This results in the fact that almost the whole acoustic energy is reflected from the bottom. On the other hand, parametric echosounders radiate waves with low frequency and narrow beam patterns which ensure high spatial resolution and allows to penetrate the sea bottom to depths of the order of tens of meters. This allows to detect objects that can be interesting, among other things, from archaeological or military point of view.
Źródło:
Archives of Acoustics; 2013, 38, 1; 99-104
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Getting to the bottom of L2 listening instruction: Making a case for bottom-up activities
Autorzy:
Siegel, Joseph
Siegel, Aki
Powiązania:
https://bibliotekanauki.pl/articles/780987.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
listening pedagogy
bottom-up listening activities
dictation
listening proficiency
Opis:
This paper argues for the incorporation of bottom-up activities for English as a foreign language (EFL) listening. It discusses theoretical concepts and pedagogic options for addressing bottom-up aural processing in the EFL classroom as well as how and why teachers may wish to include such activities in lessons. This discussion is augmented by a small-scale classroom-based research project that investigated six activities targeting learners’ bottom-up listening abilities. Learners studying at the lower-intermediate level of a compulsory EFL university course were divided into a treatment group (n = 21) and a contrast group (n = 32). Each group listened to the same audio material and completed listening activities from an assigned textbook. The treatment group also engaged in a set of six bottom-up listening activities using the same material. This quasi-experimental study used dictation and listening proficiency tests before and after the course. Between-group comparisons of t-test results of dictation and listening proficiency tests indicated that improvements for the treatment group were probably due to the BU intervention. In addition, results from a posttreatment survey suggested that learners value explicit bottom- up listening instruction.
Źródło:
Studies in Second Language Learning and Teaching; 2015, 5, 4; 637-662
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the pulse reflected from bottom sediments
Autorzy:
Nowak, Ł.
Szymczak, W.
Powiązania:
https://bibliotekanauki.pl/articles/332780.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
bottom sediments
pulse reflected
hydroacoustics
Opis:
The paper describes method of determining time proceeding of the echo pulse arising as an effect of reflection of sampling pulse given with the known form from layered sea bottom. The main goal of presented model is to afford theoretical data that could be used as a point of reference for the experimental data obtained with SES 2000 Standard parametric echosounder. Basic formulas, computation algorithm with its implementation in Matlab language and examples of obtained results are described. Numerical simulations results are compared with experimental data. The laboratory station enabling computing acoustic impedance of sediments and parameters of sampling and echo pulse in different distances from antenna is presented.
Źródło:
Hydroacoustics; 2009, 12; 159-166
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shallow-water bottom fauna of the Van Keulen fiord (Spitsbergen, Bellsund)
Autorzy:
Różycki, Olgierd
Powiązania:
https://bibliotekanauki.pl/articles/2053274.pdf
Data publikacji:
1987
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
bottom fauna
zoogeography
Źródło:
Polish Polar Research; 1987, 8, 2; 107-120
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processing data on sea bottom structure obtained by means of the parametric sounding
Autorzy:
Kozaczka, E.
Grelowska, G.
Kozaczka, S.
Szymczak, W.
Powiązania:
https://bibliotekanauki.pl/articles/259876.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
sea bottom acoustic
sub-bottom profiler
sea bed structure
Opis:
The aim of the paper is to analyze data obtained during sounding the Gdansk Bay sea bed by means of the parametric echo-sounder. The accuracy of the sea bottom structure investigation needs correct configuration of research equipment and proper calibration of peripheral devices (GPS, heading sensor, MRU-Z motion sensor and navigation instruments which provide necessary data to bathymetrical measurement system, enabling its work with full capability. The parametric sub-bottom profiler delivers two types of data which include different information: envelope and pure echo signal sampled without processing. The first is used to present echograms in real time and the second one is stored during sounding and the obtained data can be analyzed by using post-processing software. Differences in the results are presented and discussed. And, are described also criteria taken into account during determination of the measurement areas and selection of different configurations of the software according to the information to be obtained from trials. Complementary information can be achieved from processing the data by means of the procedures offered by Matlab software, which allows for a clear 3D presentation of the results. The consideration are illustrated by echograms taken in the natural conditions.
Źródło:
Polish Maritime Research; 2012, 4; 3-10
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of digital sea bottom models generated using ENC data
Autorzy:
Dupuy, R.
Makar, A.
Powiązania:
https://bibliotekanauki.pl/articles/320873.pdf
Data publikacji:
2011
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
ENC
Digital Bottom Model
Opis:
In the article basis of modeling the surface for spatial presentation of sea bottom hale been included. There have been shown typical, well known, method for generating TIN (Triangulated Irregular Network), GRID and mathematical methods using C++ environment. For presentation the sea bottom ENC (Electronic Navigational Charts) encoded in S-57 Standard have been used.
Źródło:
Annual of Navigation; 2011, 18; 27-36
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity of echo envelope fractal dimension to bottom type and bottom depth - numerical results
Autorzy:
Łubniewski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/332051.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
acoustic
seafloor
hydroacoustics
Opis:
The presented results are a part of those obtained within the author's latest work on application of normal incidence methods in acoustic seafloor characterisation. The work included both theoretical and experimental studies on selection of appropriate methods of seafloor echo processing and feature extraction for characterisation of the bottom type, especially, the study of the usefulness of several echo parameters like fractal dimension or statistical moments of the echo envelope. In this paper, the simulation results of the echo envelope fractal dimension dependence on bottom type and bottom depth are presented. They show that to same extent, fractal dimension of an echo may be useful for bottom identification even in a case of varying depth, however, more detailed, theoretical as well as experimental studies are needed.
Źródło:
Hydroacoustics; 2003, 6; 195-198
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of heavy metals contents in bottom sediments of Bug river
Autorzy:
Skorbiłowicz, E
Powiązania:
https://bibliotekanauki.pl/articles/123129.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Bug river
bottom sediment
heavy metals
Opis:
The development of industry, agriculture, and transport contributes to an increased environmental pollution by heavy metals. The aim of the study was preliminary assessment of the contents of selected metals (lead, cobalt, copper, chromium, cadmium and nickel) in the sediments of Bug river. The study comprised part of the river flowing through Poland. It was found that the Bug river sediments are not contaminated in respect to the content of tested metals. Based on the analysis of the study results, these metals can be lined up in the following order: Cr > Pb > Cu > Ni > Co > Cd. Statistical analysis showed that copper and chromium occur in Bug river sediments in forms bindings with organic matter in majority of cases. The granulometric analysis of sediments from Bug river revealed the largest percentage of two fractions: 1.0–0.2 mm with average of 47.7 ± 19.77% and 0.2–0.1 mm with average of 20.6 ± 7.7%. These are the dominant fractions with the accumulation of metals in river sediments, which has been confirmed by statistical analysis.
Źródło:
Journal of Ecological Engineering; 2014, 15, 3; 82-89
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biodegradation of bottom sediments of Turawa Lake
Autorzy:
Latała, A.
Wierzba, S.
Powiązania:
https://bibliotekanauki.pl/articles/779843.pdf
Data publikacji:
2007
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
osad denny
biopreparat
biodegradacja
bottom sediments
biopreparation
biodegradation
Opis:
In this work we tested biopreparations developed in our laboratory for their ability to degrade the organic matter of the bottom sediments of Turawa Lake. The biodegradation was conducted under laboratory conditions for 6 weeks. For the testing purposes, there were three variants of biopreparations that contained autochthonous strains originating from our own collection and their mixture. The testing showed that the introduction of the biopreparations to the bottom sediment resulted in a significant increase of the number of bacteria, which consequently brought about the reduction of organic compounds in the sediment. In the case of all the variants, the number of bacteria increased by order of 10^2 - 10^4 CFU/g after 42 days of biodegradation. Among the tested biopreparations, the most effective one was the mixture of the autochthonous strains and those originating from the collection. After biopreparation was applied, a drop of content of carbohydrates by 66.94%, fatty matter by 83.33% and proteins by 74.42% was noted.
Źródło:
Polish Journal of Chemical Technology; 2007, 9, 2; 73-77
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some methods of the sea bottom recognition
Autorzy:
Grelowska, G.
Kozaczka, S.
Szymczak, W.
Powiązania:
https://bibliotekanauki.pl/articles/332558.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
sea bottom recognition
Gdansk Gulf region
sonar
Opis:
Sea bottom structure recognition nowadays is a matter of great interest due to huge spectrum of potential applications, such as a hydrography, military oceanography, marine geosciences, offshore industry, environmental protection and many others. For that reason a great variety of tools and techniques for sea bottom measurements and modeling is developed. However, each technique leads to specific bottom images and allows to determine only few characteristics of examined area. In the paper are presented experimental results collected in the Gdansk Gulf region obtained by means of three technique: wide side sonar, parametric sonar and multi-beam sonar.
Źródło:
Hydroacoustics; 2009, 12; 69-76
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Szczecin Lagoon - A single or multiple biotopes?
Autorzy:
Poleszczuk, G.
Powiązania:
https://bibliotekanauki.pl/articles/84803.pdf
Data publikacji:
2000
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
Szczecin Lagoon
biotope
hydrological regime
bottom morphology
bottom sediment
salinity
ecosystem
biocenosis
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2000, 04
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The sea bottom surface described by Coons pieces
Autorzy:
Makar, A.
Powiązania:
https://bibliotekanauki.pl/articles/135410.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
multibeam echosounder
modeling
sea bottom
Coons surface
Lagrange polynomial
computer graphics
Opis:
In this paper, a method of mathematical description of a surface, which can be used for modeling the sea bottom and detecting underwater objects using sonar (a side scan sonar or a front one) or a multibeam echosounder, is presented. The method is based on Coons plates and is described in four steps, which can be used for determination of the sea bottom for spatial presentation and volume calculation. A new sounding vessel and its equipment were used for the collection of geospatial data, and the results of a geospatial model of the sea bottom on the basis of the collected data are shown. The sea bottom is presented using Coons surfaces and a triangulated irregular network.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 187-190
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of Small Bottom Objects from Multibeam Echosounder Data
Autorzy:
Iwen, D.
Wąż, M.
Powiązania:
https://bibliotekanauki.pl/articles/320733.pdf
Data publikacji:
2018
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
Multibeam Echo sounder
bathymetric survey
bottom object
detection
Opis:
Multibeam Echo Sounder Systems (MBES) shallow water surveys provide capability not only acquiring bathymetric data useful for determining isobaths and mapping features on the seafloor which may be a hazard to navigation. They also allow detection of objects smaller or deeper than those required for the safety of seafaring and International Hydrography Organization (IHO) standards. In this article some of issues related to of efficient MBES shallow water surveys are stressed. Additionally a draft of post-processing techniques and result data format together with tools allowing extraction of bottom object from bathymetric data are presented.
Pomiary na płytkich wodach z użyciem systemu echosondy wielowiązkowej dają możliwości pozyskiwania danych batymetrycznych przydatnych do aproksymacji izobat, ale również mapowania cech dna morskiego mogących stanowić niebezpieczeństwo dla nawigacji. Ponadto pozwalają wykryć obiekty mniejsze lub położone głębiej niż wymaga tego standard Międzynarodowej Organizacji Hydrograficznej dla zapewnienia bezpiecznej żeglugi. W tym artykule zwrócono uwagę na pewne zagadnienia odnoszące się do wydajności pomiarów z użyciem echosondy wielowiązkowej na płytkich wodach. Ponadto przedstawiono sugestie odnośnie technik opracowania danych w trybie post-processingu wraz z dyskusją przydatności konkretnych formatów danych w przypadku posługiwania się wybranymi narzędziami dla wydzielenia obiektów dennych spośród danych batymetrycznych.
Źródło:
Annual of Navigation; 2018, 25; 219-232
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 387

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