Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "bottom" wg kryterium: Wszystkie pola


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:
Konflikt bottom up – top down w ujęciu teorii gier
Autorzy:
Kiryluk-Dryjska, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/581142.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
teoria gier
bottom up
Leader
Opis:
Celem publikacji jest przedstawienie konfliktu bottom up – top down w polityce rozwoju obszarów wiejskich na przykładzie programu Leader. W publikacji zastosowano teorię gier niekooperacyjnych: podejście klasyczne (równowagę Nasha) oraz alternatywne wprowadzone przez S. Bramsa [1994] – równowagę długowzroczną. Układ preferencji graczy został określony na podstawie sondażu przeprowadzonego pośród przedstawicieli lokalnych grup działania (LGD) w Wielkopolsce. Wyniki badań wykazują, że z obawy przed odrzuceniem projektów zgłaszanych do LGD często wybierane są te bardziej standardowe, mieszczące się w ogólnych ramach polityki rozwoju obszarów wiejskich, w mniejszym natomiast stopniu wyraźnie dostosowane do specyfiki lokalnych potrzeb. Na zmianę sytuacji w tym zakresie powinna wpłynąć pełna decentralizacja decyzji podejmowanych w ramach programu Leader.
Źródło:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2017, 477; 111-116
1899-3192
Pojawia się w:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
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
Tytuł:
Zinc and lead in bottom sediments and aquatic plants in river Narew
Autorzy:
Skorbiłowicz, E.
Powiązania:
https://bibliotekanauki.pl/articles/124796.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
river
bottom sediment
aquatic plants
zinc
lead
Opis:
Aquatic ecosystems are a valuable part of natural environment. The increasing level of pollution in waters transforming biocoenoses and other adverse effects of the impact of toxic substances have contributed to the development of biological monitoring. The aim of the study was to determine the changes in contents of zinc and lead in bottom sediments and roots of aquatic plants: Phragmites australis and Acorus calamus in the river Narew. There were 14 points on the river, from where samples of bottom sediments and plant material were collected. The contents of lead and zinc were determined by means of flame atomic absorption spectrophotometry using Varian device. It was proven that bottom sediments were characterized by low contents of zinc and lead except from two sampling points: in Bondary and Narew. Achieved results of analyzes of plant material showed a slight exceeding in the case of lead. Spatial distribution of zinc and lead contents in examined roots of plants coincided with their contents in bottom sediments, which was also confirmed by statistical analysis. It was proven that aquatic plants had greater tendency for accumulation of metals than bottom sediments.
Źródło:
Journal of Ecological Engineering; 2015, 16, 1; 127-134
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy metals migration in the system: near-bottom water - interstitial water - bottom sediment in Gardno Lake
Migracja metali cięśkich w układzie: woda przydenna - woda iłowa-– osad denny jeziora Gardno
Autorzy:
Trojanowski, J.
Trojanowska, C.
Janczak, C.
Powiązania:
https://bibliotekanauki.pl/articles/84847.pdf
Data publikacji:
2007
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
heavy metal
metal migration
bottom water
interstitial water
bottom sediment
Lake Gardno
lake
heavy metal concentration
accumulation property
Opis:
The study of heavy metals concentration in the estuarine lake Gardno water and bottom sediments showed that the river Łupawa and periodic inputs of sea water exert decisive influence on forming of the water stores and bottom sediments quality in this lake. The largest concentrations of Cd, Cu, Mn, Pb and Zn were observed at river mouth into the lake region (Cd – 0.26, Cu – 3.71, Mn – 94.3, Pb – 10.01, Zn – 16.26 μg dm-3) and the lowest at water outflow from the lake region (Cd – 0.13, Cu – 1.81, Mn – 53.8, Pb – 8.86, Zn – 8.05 μg dm-3). Average concentrations of those metals in the lake water, suspension and bottom sediment form the following row: Mn>Zn>Pb>Cu>Cd. The contents of analysed metals were the highest in interstitial water, smaller in near-bottom water and the smallest in surface water. Average content of metals in near-bottom suspension was about 30% higher than that in surface suspension, but enrichment factors of those metals in suspensions do not show essential statistic differences. This probably results from continual mixing of water masses by wind. The migration coefficients indicated that bottom sediments of lake Gardno have large accumulation properties of heavy metals.
W latach 2002-2003 przeprowadzono badania nad koncentracją metali ciężkich w wodzie i osadach dennych estuariowego jeziora Gardno. Wykazano, że przepływająca przez to jezioro rzeka Łupawa i okresowe wlewy wody morskiej mają istotny wpływ na zawartość Mn, Zn, Cu, Pb i Cd w wodzie i osadach dennych tego jeziora. Największą koncentrację tych metali obserwowano w rejonie ujścia Łupawy do jeziora (Cd – 0,26, Cu – 3,71, Mn – 94,3, Pb – 10,01 Zn – 16,26 μg dm-3), a najmniejszą w rejonie wypływu tej rzeki z jeziora (Cd – 0,13, Cu – 1,81, Mn – 53,8, Pb – 8,86, Zn – 8,05 μg dm-3). Przeciętna zawartość tych metali w wodzie, zawiesinach i osadzie dennym układała się w następującej kolejności Mn>Zn> Pb>Cu>Cd. Ich stężenia były najwyższe w wodzie iłowej, mniejsze w wodzie przydennej, a najmniejsze w wodzie powierzchniowej. Przeciętna zawartość analizowanych metali w zawiesinie przydennej była o około 30% większa niż w zawiesinie powierzchniowej. Wyznaczone współczynniki wzbogacenia wskazują, że Pb, Zn i Mn w osadach dennych badanego jeziora są głównie pochodzenia antropogenicznego, natomiast Cd pochodzenia naturalnego. Pochodzenie Cu zależne jest od rejonu jeziora. Osady denne jeziora Gardno charakteryzują się dużymi zdolnościami kumulacji metali ciężkich. Dlatego też w tym jeziorze obserwuje się głównie migrację badanych metali z toni wodnej do wody iłowej i osadów dennych. Udział we wzbogacaniu wody przydennej w Pb, Zn i Cu mają zarówno osady denne, jak i opady atmosferyczne. Wiosną i jesienią decydujący wpływ mają opady atmosferyczne, a latem osady denne.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2007, 11
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical note: Stability of a levee made of bottom sediments from a dam reservoir
Autorzy:
Koś, K.
Zawisza, E.
Powiązania:
https://bibliotekanauki.pl/articles/178768.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bottom sediments
hydraulic embankments
stability
Opis:
Stability analysis of a levee made of the bottom sediments from Czorsztyn-Niedzica Reservoir is presented in the paper. These sediments were classified as silty sands and, based on the authors’ own research, their geotechnical parameters were beneficial, so the possibility of using this material for the hydraulic embankments was considered. Stability and filtration calculations were carried out for a levee that had the same top width – 3 m, slope inclinations 1:2 and different heights: 4, 6 and 8 m. Two methods were used: analytical and numerical. Calculations were carried out without and with a steady and unsteady seepage filtration. Based on the analysis carried out it was stated that the levee made of the bottom sediments is stable even at the height of 8.0 m, although because of the seepage on the downstream side it is recommended to use a drainage at the toe of the slope.
Źródło:
Studia Geotechnica et Mechanica; 2014, 36, 4; 65-70
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accumulation of 137Cs in bottom sediments of the Curonian Lagoon
Autorzy:
Lujaniene, G.
Vilimaite. -Šilobritiene, B.
Jokšas, K.
Powiązania:
https://bibliotekanauki.pl/articles/148785.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
caesium
sorption
desorption
bottom sediments
Opis:
Measurements of activity concentrations and speciation of 137Cs in bottom sediments of the Curonian Lagoon were carried out in samples collected in 1999-2003. In addition, the sorption-desorption processes of caesium in disturbed bottom sediments of fresh and sea water systems were investigated in long-term experiments (up to 375 days) in order to better understand the caesium behaviour during the Baltic Sea water flooding events to the Curonian Lagoon. The modified Tessier method was used to study caesium associations with geochemical phases of bottom sediments. The effect of carbonate coatings of bottom sediments on the Cs sorption-desorption process was observed. The comparative analyses of 137Cs solid phase speciation in bottom sediments after 241 and 375 days of the sorption experiment with that of the 137Cs speciation, determined in the same sediment sample before the sorption experiment, indicated that after 375 days of sorption the equilibrium was not reached, however, the Cs distribution in geochemical phases was found to be close to equilibrium. The desorption experiments evidenced the release of caesium into solution from regular exchange complex and transfer from other phases to the frayed edge sites on the layered clay minerals with its further fixation in the crystal lattice. The remobilization of "fixed" caesium was not observed, on the contrary, the redistribution of caesium with its subsequent fixation in clay minerals was observed, and on a time scale its fixation kinetics was comparable with the sorption experiment. This study showed that flooding events of sea water contaminated with caesium can cause a significant accumulation of caesium in the bottom sediments of the Curonian Lagoon and result in the redistribution of 137Cs activity concentration in the bottom sediments from one area to another.
Źródło:
Nukleonika; 2005, 50, 1; 23-29
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long gravity waves in a canal with a corrugated bottom in the asymptotic description
Autorzy:
Bielski, Włodzimierz
Wojnar, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/1839674.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
bottom profiles
homogenization approach
effective depth
Opis:
We consider the classic Lagrange long gravitational wave of a homogeneous incompressible fluid in a shallow canal with a corrugated bottom. We use the asymptotic expansion method to find the effective depth of a one-dimensional canal and, hence, the effective wave velocity. A flow in a two-dimensional tank with a corrugated bottom is also studied by this method.
Źródło:
Journal of Theoretical and Applied Mechanics; 2021, 59, 3; 443-454
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwości wykorzystania osadów dennych pochodzących z rzeki San
Possibility of use of bottom sediments derived from the San River
Autorzy:
Maj, K.
Koszelnik, P.
Powiązania:
https://bibliotekanauki.pl/articles/401405.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
osady denne
jakość osadów
metale ciężkie
PCB
WWA
bottom sediments
quality of bottom sediments
heavy metals
PCB-s
Opis:
Osady denne są wydobywane z dna rzek, jezior, kanałów, zbiorników retencyjnych oraz stawów w celu zwiększenia ich pojemności retencyjnej oraz poprawy walorów użytkowych. Wydobyty urobek, który nie zawiera substancji szkodliwych może być odpowiednio wykorzystany. Kierunek zagospodarowania osadów dennych jest uzależniony od ich właściwości chemicznych i fizycznych. W pracy przedstawiono możliwości wykorzystania osadów dennych w rolnictwie, leśnictwie i budownictwie. Omówiono kryteria decydujące o technologii zagospodarowania osadów dennych. Ponadto zaproponowano własny schemat postępowania z wybagrowanymi osadami dennymi oparty na polskim prawodawstwie. Opierając się na wyżej wymienionym schemacie zaprezentowano potencjalne sposoby wykorzystania osadów dennych pochodzących z rzeki San. Charakterystyka chemiczna tych osadów wskazuje na ich umiarkowane zanieczyszczenie substancjami organicznymi i metalami ciężkimi, dlatego też mogą być zastosowane do użyźniania gruntów ujętych w Rozporządzenie Ministra Środowiska z dnia 9 września 2002 r. w sprawie standardów jakości gleby oraz standardów jakości ziemi (Dz.U. 2002 Nr 165 poz. 1359).
Bottom sediments are extracted from the bottom of river, lakes, canals, reservoirs, and ponds in order the enhance their capacity and to improve the retention values. Excavated spoils, that does not contain harmful substances may be used. The direction of the management of bottom sediments depends on their chemical and physical properties. At work are examples of the use of bottom sediments in agriculture, forestry and construction. Discusses the criteria for sediment management technology. Proposed their own scheme to use dredging sediments in compliance with the Polish legislation. Based on the above diagram shows the potential ways to use bottom sediment from river San. Physico-chemical characteristics of the sediments indicates on their moderate pollution of organic substances and heavy metals, be used to fertilize the land included in the Regulation of Minister of the Environment of 9 September 2002 on the quality of soil and earth quality standards (2002 No 165 pos. 1359).
Źródło:
Inżynieria Ekologiczna; 2016, 48; 147-152
2081-139X
2392-0629
Pojawia się w:
Inżynieria Ekologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mercury contamination of bottom sediments in water reservoirs of southern Poland
Autorzy:
Koniarz, T.
Tarnawski, M.
Baran, A.
Florencka, N.
Powiązania:
https://bibliotekanauki.pl/articles/184703.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
mercury
bottom sediments
reservoirs
geoaccumulation parameters
Opis:
The aim of this study was to assess the mercury concentration in bottom sediments, collected from eight reservoirs located in south-eastern Poland. A DMA-80 Mercury Analyser was used for the analysis of the concentration of mercury in bottom sediments. Concentration of mercury in sediments was between 0.01–0.18 mg∙kg−1. The research results show that 13 samples are above the Polish Hg background level. Only 9 samples are below the background level. Generally, the sediments belonged to class I and II (unpolluted and moderately polluted sediments). The concentration of mercury in bottom sediments follows the order: Rybnik (highest) > Bagna Rzeszowskie > Rzeszów > Ożanna > Brzóza Stadnicka > Brzóza Królewska > Głuchów > Narożniki (lowest). The low mercury content in sediments is related to absent or limited anthropogenic sources of this metal. Elevated concentrations of Hg in bottom sediments of the reservoirs in Rybnik and Bagna Rzeszowskie are related to their proximity to large agglomerations and industrial plants. Organic matter was likely to be the most important factors controlling the concentration and distribution of mercury in the studied sediments.
Źródło:
Geology, Geophysics and Environment; 2015, 41, 2; 169-175
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An affecting on the port bottom by ships water jet during berthing manoeuvre
Autorzy:
Galor, W.
Powiązania:
https://bibliotekanauki.pl/articles/247588.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ship's water jet
safety of navigation
scoring of port bottom
Opis:
In port engineering in the vicinity of quays, the action of the ship's propulsion is a prime eroding element. This may cause scouring of the bottom of port water area and erosion so great that it could lead to ąuay damage by change of its stability. Thus, the speed of ship's water jet is important criterion of navigational safety assessment. Scouring of an unprotected bottom depends on the type of manoeuvres (ship's settings and their duration), area depth and type of bottom. As the number of cruise ships, irregularly calling at ports, has increased recently, there is often a need to accept such ships for berthing along quays with an unprotected bottom. Bottom protection is a costly investment, far from profitable when callings are not frequent. The situation when a ship gives up its own propulsion during berthing and unberthing and has to use tugs is not profitable for ship operators. As a result, ships may resign from calling at such ports. For this reason it is purposeful to make a navigational analysis [1] of ship manoeuvring near the ąuay and to assess the effect of water jet on the bottom. This paper examines large ships manoeuvres during berthing. The study focuses on analytical methods for assessing ship 's affect on the port bottom. The paper presents some problems on possible manoeuvres of cruise ships with own propulsion along the Bulwar Chrobrego Quay in the port of Szczecin.
Źródło:
Journal of KONES; 2010, 17, 4; 169-175
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Total alkaline phosphatase activity in bottom sediments of Rusalka lake in the city of Szczecin
Autorzy:
Daniszewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/411885.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
total alkaline phosphatase activity
bottom sediment
Rusalka lake
Opis:
Have studied lake close to neutral pH 7.75 to 7.62. Aquatic waters are order - phosphorus and nitrogen compounds. Level of activity alkaline phosphatase (APA) has an important impact on the chemical and biological processes taking place in the aquatic environment. APA belongs to a group of indicators, who tells us about the extent limitations to development of biomass in the tank water. Water of Rusalka lake were the subjects of 2008-2012 (July – September). Total alkaline phosphatase activity was determined seven times a year in these environments. A study of seasonal fluctuations showed that a maximum total alkaline phosphatase activity, both in the bottom sediment, occurred in spring (May) and summer (July, August).
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 7, 1; 67-72
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry of waters and bottom sediments in landslide lakes in Babiogórski National Park
Autorzy:
Sala, Dariusz
Rzepa, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2086487.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
bottom sediments
water
trace elements
Babiogórski National Park
Opis:
The aim of this work was to assess the contamination of the landslide lakes located within Babiogórski National Park. For this purpose, samples of water and bottom sediment from 12 lakes were collected. Chemical analyses of the waters (including main cation and anion concentrations, trace-metal levels and selected physicochemical parameters) and of the sediments (including heavy metals) were performed. The waters are acidic to neutral and are characterized by low mineralization. Concentrations of trace elements are commonly low. Elevated levels of Fe, Mn and Al are probably related to natural geochemical processes. The sediments are strongly contaminated by Cd, whereas other trace metals levels are at their hydrogeochemical background. The high level of Cd contamination is most probably related to long-range industrial emissions.
Źródło:
Mineralogia; 2011, 42, 1; 63--72
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry of waters and bottom sediments in landslide lakes in Babiogórski National Park
Autorzy:
Sala, D.
Rzepa, G.
Powiązania:
https://bibliotekanauki.pl/articles/2086539.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
bottom sediments
water
trace elements
Babiogórski National Park
Opis:
The aim of this work was to assess the contamination of the landslide lakes located within Babiogórski National Park. For this purpose, samples of water and bottom sediment from 12 lakes were collected. Chemical analyses of the waters (including main cation and anion concentrations, trace-metal levels and selected physicochemical parameters) and of the sediments (including heavy metals) were performed. The waters are acidic to neutral and are characterized by low mineralization. Concentrations of trace elements are commonly low. Elevated levels of Fe, Mn and Al are probably related to natural geochemical processes. The sediments are strongly contaminated by Cd, whereas other trace metals levels are at their hydrogeochemical background. The high level of Cd contamination is most probably related to long-range industrial emissions.
Źródło:
Mineralogia; 2011, 42, 1; 63--72
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of bottom sediment stratification
Autorzy:
Grelowska, G.
Kozaczka, E.
Powiązania:
https://bibliotekanauki.pl/articles/332163.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The main goal of this paper is to find a method to assess remotely the type of sediments on the basis of the signal received using the parametric echosounder. The images of the sea bottom sediments taken by a parametric echosounder show the fine structure of the upper layer of the bottom sediments. The depth of penetration depends on the type of sediment, in fact on the attenuation of acoustic wave. In the paper the method of distinguishing the sediment layer basing on interpretation the received bottom signal is proposed. The knowledge on acoustic parameters of different type of sediments obtained in laboratory condition or using the literature data, allows to predict the composition of upper layer of the bottom. The considerations are illustrated by the results recorded from the bottom of the Gulf of Gdansk.
Źródło:
Hydroacoustics; 2014, 17; 93-103
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability Evaluation of Transmission Planetary Gears “bottom-up” approach
Autorzy:
Živković, Predrag
Milutinović, Miroslav
Tica, Milan
Trifković, Spasoje
Čamagić, Ivica
Powiązania:
https://bibliotekanauki.pl/articles/24200801.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
planetary gear
failure rate
reliability
bottom-up
Opis:
The reliability study is the most important part of the engineering design process, as it is the basis of analysis and assessment of future product performance in exploitation. Since performance cannot be predicted with absolute certainty, the application of reliability theory includes probability theory and unreliability modeling. The proposed approach has been applied to assess the reliability of gear planetary power transmissions. The assessment of system reliability was determined on the basis of the block diagram method, as a function of the reliability of individual components, calculated by statistical analysis. Using the Weibull model, the reliability of the planetary gear was defined on the basis of the probability of failure of the gear teeth and the results were interpreted to assess the reliability of the component and the entire planetary train. For a more precise assessment of reliability and to avoid modeling every failure and mode of occurrence, a competitive risk model was developed. The reliability assessment study was conducted with a “bottom-up” approach. Reliability has been assessed, for instantaneous, estimated and assigned failures rate of planetary train and component.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 1; art. no. 2
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of sea bottom using bézier pieces
Autorzy:
Makar, A.
Powiązania:
https://bibliotekanauki.pl/articles/331993.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
In the article the essence of creating Bézier piece, determination its points, degree elevation and division have been shown. These issues are essential during creation the digital terrain model DTM. For creation the sea bottom model bathymetric surveys of Slupsk Bank have been used. The visualization of sea bottom with detected underwater object recorded by multibeam echosounder using Bézier pieces has been presented.
Źródło:
Hydroacoustics; 2010, 13; 183-190
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Notes on the Use of Effective Methods for Application of Economics of Moderation
Autorzy:
Jekielek, Jan
Powiązania:
https://bibliotekanauki.pl/articles/680996.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Project improvement, bottom-down improvement approach, bottom-down methods, Economics of Moderation
Opis:
One of the side eects of the American 1979 recession-triggered replacement of Keynesian Economics by Monetarism of the Milton Friedman Chicago School of Economics was the replacement of managing engineers by administrators in technology organizations, construction and projects.In that role reversal, costs invariably started to go up with growing administration preoccupied with numbers and dates, and with form often prevailing over content that seemed to be sometimes “lost in translation”. The era sometimes called “Economics of Excess” had begun.Organizations faced with escalating costs have kept searching for improvement solutions making use of elaborate analytical top-down methods, with very mixed results. A simple bottom up approach and methods developed and applied by the author on industrial and educational projects are summarized. Tey have been very successful on their own as well as in supporting organizational improvement eorts. They are directly applicable to the concept of Economics of Moderation.
Źródło:
Rocznik Administracji Publicznej; 2016, 2
2449-7800
Pojawia się w:
Rocznik Administracji Publicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydromechaniczna technologia wydobywania osadów dennych
Hydromechanical technology of bottom sediments extraction
Autorzy:
Eymontt, A.
Wierzbicki, K.
Powiązania:
https://bibliotekanauki.pl/articles/238771.pdf
Data publikacji:
2017
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
zbiornik wodny
nawóz organiczny
osad denny
organic fertilizer
bottom sediments
water reservoir
Opis:
Osady denne zalegające w zbiornikach wodnych stwarzają zagrożenie środowiskowe i żeglugowe utrudnienia techniczne, ale po wydobyciu stanowią cenny nawóz organiczny. Dotychczas stosowane metody wydobywania osadów lub ich neutralizacji są drogie i nie zawsze w pełni skuteczne. W Instytucie Technologiczno-Przyrodniczym opracowano technologię wydobywania osadów dennych o koncentracji suchej masy do 30%, co umożliwiło wykonanie modelu urządzenia i jego sprawdzenie w praktyce. Badania składu wydobytych osadów ze stawów rybnych w Falentach i badania wazonowe oddziaływania mieszanek nawozów organicznych opracowanych na bazie tych osadów na wzrost roślin wykazały skuteczność porównywalną z działaniem obornika [EYMONTT i in. 2017]. W związku z powyższym planuje się dalszy rozwój i wdrażanie do praktyki opracowanej technologii wydobycia osadów oraz produkcji nawozów organicznych.
Bottom sediments, on the one hand, in reservoirs, pose environmental threats and shipping technical difficulties, but on the other hand, after extraction, are valuable organic fertilizer. Existing methods of sediment extraction or neutralization are expensive and not always effective. The technology developed by the Institute of Technology and Natural Resources for the extraction of bottom sediments with a concentration of dry matter up to 30% enabled the model to be made and tested in practice. The study of the composition of the extracted fishpond sediment in Falenty and the study of the effect of mixtures of organic fertilizers prepared on the basis of these sediments on the growth of plants showed the effectiveness comparable with the effect of manure. As a result, further development and implementation of the developed sediment extraction technology and the production of organic fertilizers are planned.
Źródło:
Problemy Inżynierii Rolniczej; 2017, R. 25, nr 4, 4; 19-27
1231-0093
Pojawia się w:
Problemy Inżynierii Rolniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Podejścia top-down i bottom-up w rozwoju obszarów wiejskich w Polsce
The top-down and the bottom-up approach in Rural Development in Poland
Autorzy:
Wilczyński, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/2029278.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2014, 154; 72-82
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractionation of Cadmium, Lead and Copper in Municipal Solid Waste Incineration Bottom Ash
Autorzy:
Łukowski, Adam
Olejniczak, Joanna Irena
Powiązania:
https://bibliotekanauki.pl/articles/124181.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heavy metals
BCR method
metal fraction
MSWI bottom ash
Opis:
The basic physicochemical properties such as: dry mass, pH, pseudo-total content of cadmium, lead and copper, were determined in the fresh bottom ash samples from a municipal waste incineration plant. In order to study fractional composition of the investigated heavy metals, the BCR method was used (F1 – acid soluble and exchangeable fraction, F2 – reducible fraction, F3 – oxidizable fraction, F4 – residual fraction). The average percentage of cadmium in particular fractions was as follows: F1 (37.5%) > F4 (27.2%) > F2 (25.3%) > F3 (10.0%), for lead: F4 (36.5%) > F2(27.2%) > F3(23.4%) > F1(12.9%), and in the case of copper F4(66.3%) > F3(22.1%) > F2(7.4%) > F1(4.2%). Among the studied metals, in mobile pool (F1-F3) the highest amount of cadmium was noted (72.8%); for lead it was 63.5%, and for copper 33.7% of the pseudo-total content.
Źródło:
Journal of Ecological Engineering; 2020, 21, 3; 112-116
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seismostratigraphy of bottom sea sediments in some areas of the Spitsbergen Archipelago
Autorzy:
Kowalewski, Włodzimierz
Rudowski, Stanisław
Zalewski, S. Maciej
Żakowicz, Krystyna
Powiązania:
https://bibliotekanauki.pl/articles/2053281.pdf
Data publikacji:
1987
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
geophysics
seismoacoustic
bottom sediments
Źródło:
Polish Polar Research; 1987, 8, 1; 3-23
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Content of Heavy Metals in Bottom Sediments of Selected City Rivers of the Podlasie Province
Autorzy:
Skorbiłowicz, M.
Skorbiłowicz, E.
Górska, M.
Powiązania:
https://bibliotekanauki.pl/articles/124842.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heavy metals
river
bottom sediments
Opis:
The purpose of the work was to determine the relationship between the state of the water environment quality of selected rivers (Zn, Cr, Pb, Cd and Cu tests in bottom sediments), and the sources of pollution resulting from the close proximity to the cities, through which they flow. The following rivers were selected for the study: the Biała river flowing through the city of Białystok, the Narew river flowing through the city of Tykocin and the village of Złotoria, the Supraśl river flowing through the village of Michałowo and Gródek as well as the Biała river flowing through the city of Bielsk Podlaski. The sediments were collected four times from the same points in 2016 in the period from July to October. The sediment samples were collected from the points located on rivers before and beyond towns and villages. The contents of the following metals were tested in the bottom sediment samples: Zn, Cr, Pb, Cd and Cu. The analyses were carried out applying the flame absorption spectrometry method. The statistical multivariate CA and FA analyzes were used. The highest contents of Zn, Pb and Cr were recorded in the bottom sediments from the following rivers: Biała (Białystok) and Biała inflow of Orlanka (Bielsk Podlaski), which resulted from the anthropogenic activity. The research also showed the impact of the agricultural activity due to the slightly elevated Cd level.
Źródło:
Journal of Ecological Engineering; 2018, 19, 4; 197-206
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractions of Zinc, Chromium and Cobalt in Municipal Solid Waste Incineration Bottom Ash
Autorzy:
Łukowski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/2068456.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
MSWI bottom ash
municipal solid waste incineration
BCR method
heavy metal
metal fraction
Opis:
In the fresh samples of municipal solid waste incineration (MSWI) bottom ash, the fractional composition of Zn, Cr and Co was investigated. The BCR method was utilised to evaluate the acid soluble and exchangeable fraction (F1), reducible fraction (F2), oxidizable fraction (F3) and residual fraction (F4). Physico-chemical parameters such as pH, dry mass, and pseudo-total metal content were also determined. The percentage of zinc in fractions was in the following order: F3 (31.8%) > F1 (30.6%) > F2 (27.8%) > F4 (9.8%), for chromium F4 (88.7%) > F3 (5.4%) > F1 (3.2%) > F2 (2.7%), and in the case of cobalt F4 (59.8%) > F1 (14.3%) > F2 (13.6%) > F3 (12.3%). Mobile metal pool (F1–F3) gathered the most of zinc (90.2%) and the least of chromium (11.3%).
Źródło:
Journal of Ecological Engineering; 2022, 23, 3; 12--16
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sea bottom typing using fractal dimension
Autorzy:
Łubniewski, Z.
Stepnowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/332284.pdf
Data publikacji:
1997
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The article presents an attempt to apply elements of fractal analysis for the purpose of sea bottom typing. The fractal dimension was calculated as box dimension for sampled envelopes of echo signals from four types of sea bottom recorded during mobile acoustic surveys carried out in Lake Washington. The results obtained show that the simple method applied can be used for on board sea bed recognition in real time with accuracy similar to that of other methods.
Źródło:
Hydroacoustics; 1997, 1; 131-134
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical properties of bottom ash dredged material mixtures in laboratory tests
Autorzy:
Bałachowski, L.
Sikora, Z.
Powiązania:
https://bibliotekanauki.pl/articles/178968.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bottom ash
mechanical properties
laboratory tests
dike
popioły
właściwości mechaniczne
badania laboratoryjne
grobla
Opis:
Bottom ash from EC Gdańsk and dredged material taken from the mouth of The Vistula were mixed to form an engineering material used for dike construction. Mixtures with different bottom ash content were tested in laboratory to determine its basic physical and mechanical properties. The optimum bottom ash–dredged material mixture, built in the corps of the test dike, contains 70% of ash. The optimum bottom ash content in the mixture was chosen taking into account high internal friction angle, good compaction and reduced filtration coefficient. The maximum dry density of the mixtures was measured in Proctor test for the mixtures formed in laboratory and on samples taken from the test dike. Minimum and maximum void ratio were also determined.
Źródło:
Studia Geotechnica et Mechanica; 2013, 35, 3; 3-11
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemical characteristics of bottom sediments in the Odra River estuary - Roztoka Odrzańska (north-west Poland)
Autorzy:
Piotrowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/2058755.pdf
Data publikacji:
2004
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Roztoka Odrzańska
Odra River estuary
bottom sediments
TOC
heavy metals
MDS
Opis:
Roztoka Odrzańska is the last section of the Odra River estuary. Both in 1996, and in 1999 concentrations of Zn, Cu, Pb, Cd and Hg in the surface waters of Roztoka Odrzańska were within the limits for I class of purity. Maps of the heavy metal distributions in bottom sediments resemble those of TOC distribution in the < 0.20 mm fraction. Overall, 58.3% of the bottom sediments of Roztoka Odrzańska in 1996, as regards concentrations of Cd, Zn, Pb, Cu and Hg, belonged to class IV of purity; 14.6% belonged to class III; 18.8% belonged to class II and 8.3% to class I at all research stations. The excessive pollution the Roztoka Odrzańska sediments is controlled mainly by Cd and Zn concentrations and, to a much lower degree by Pb. Analyses in 1999 showed similar average concentrations of Cu, Zn and Pb, but less than half the content of cadmium. Concentrations, though, of cobalt (1.8x) and especially mercury (22.7x) were higher than the 1996 average levels. The observed concentrations fall within the concentration limits recorded in 1996 for Cu, Zn, Pb, Cd and Co, but they exceed these limits considerably for Hg.
Źródło:
Geological Quarterly; 2004, 48, 1; 61--76
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Total alkaline phosphatase activity in bottom sediments of Szmaragdowe lake in the city of Szczecin (North-West Poland)
Autorzy:
Daniszewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/412439.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
total alkaline phosphatase activity
bottom sediment
Szmaragdowe Lake
Opis:
Level of activity alkaline phosphatase (APA) has an important impact on the chemical and biological processes taking place in the aquatic environment. APA belongs to a group of indicators, who tells us about the extent limitations to development of biomass in the tank water. Water of Szmaragdowe lake were the subjects of 2008-2012 (July - September). Total alkaline phosphatase activity was determined seven times a year in these environments. A study of seasonal fluctuations showed that a maximum total alkaline phosphatase activity, both in the bottom sediment, occurred in spring (May) and summer (July, August). Total alkaline phosphatase activity in the bottom sediment of Szmaragdowe lake over the five-year period of study oscillated between 764.1 to 7938.7 nmol PO4źdm-3źh -1. In the littoral it ranged from 3107.4 to 7938.7 nmol PO4źdm-3źh -1, and in sublittoral from 764.1 to 3429.5 nmol PO4źdm-3źh -1.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 8, 2; 182-187
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of Spatial Distribution of Phosphorus and Nitrogen in the Bottom Sediments of the Water Reservoir Poraj
Autorzy:
Rozpondek, K.
Rozpondek, R.
Pachura, P.
Powiązania:
https://bibliotekanauki.pl/articles/123884.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
bottom sediments
spatial distribution
eutrophication
Opis:
The aim of this study was to determine the content of phosphorus and nitrogen in the bottom sediments of the Poraj Reservoir located on the Warta River, along with defining their spatial distribution and the relationship between these elements and organic matter, aluminum and iron. Samples of bottom sediments were collected on the basis of regular measurement grid of 46 points located in the area of the water reservoir Poraj. The collected samples were analyzed in terms of content of following elements, which values are in range: total phosphorus (TP) 0.06 – 5.06 g/kg, total nitrogen (TN) 0.17 – 9.66 g/kg, organic matter (OM) 0.49 – 28.41% of solid content, aluminum (Al) 2.44 – 145.15 g/kg and iron (Fe) 0.28 – 16.50 g/kg. By using of GIS system, spatial distribution of obtained results of laboratory analyzes were interpolated (Inverse Distance Weighted method was used). On basis of spatial distribution it was noted that in northern part of water reservoir bottom sediments have greater values of TP, TN and OM than in southern part. The study also included calculation of correlation between: OM and TN (n=46, R2 = 0.9335), TN and Fe (n=46, R2 = 0.8782), TN and Al (n=46, R2 = 0.8629), OM and Fe (n=46, R2 = 0.8243), OM and Al (n=46, R2 = 0.7981), TP and Fe (n=46, R2 = 0.7456), TP and Al (n=46, R2 = 0.6209). The presented pilot studies show that the potential content of phosphorus, nitrogen and organic matter in the sediments of the water reservoir Poraj can reach a significant level. The need to plan and carry out further research allowing the evaluation of the properties of the analyzed elements and examining their potential impact on water quality in the tested water reservoir was stated.
Źródło:
Journal of Ecological Engineering; 2017, 18, 4; 178-184
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pulp and Paper Wastewater Treatment with Bottom Ash Using Jar Test
Autorzy:
Pisceselia, Dian F.
Arita, Susila
Agustina, Tuty Emilia
Powiązania:
https://bibliotekanauki.pl/articles/2202330.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
adsorbent
pulp and paper wastewater
bottom ash
jar test
Opis:
The wastewater generated from pulp and paper production still contains pollutants and contaminants, so appropriate and economical materials are needed to reduce pollutants by using adsorbents from bottom ash. This study examined the characteristics of bottom ash and pulp and paper wastewater, the effect of stirring time, stirring speed, and adsorbent activation temperature on decreasing the environmental parameters of wastewater. The synthesis of bottom ash as an adsorbent was carried out by heating at 100 and 200 °C for 1 hour. The wastewater treatment process with maximum yield occurs at a stirring speed of 100 rpm for 50 min. The use of bottom ash without heating as an adsorbent in the pulp and paper wastewater treatment process has reduced TSS 77.5%, COD 85.72%, chloride 26.9%, TDS 1143 ppm, and EC 2180 s/cm, which have met the environmental quality standards.
Źródło:
Journal of Ecological Engineering; 2023, 24, 1; 188--194
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An appraisal of the properties of bottom waste obtained from bio-mass congestion to estimate the ways of its environmental use
Autorzy:
Śliwka, M.
Uliasz-Bocheńczyk, A.
Pawul, M.
Powiązania:
https://bibliotekanauki.pl/articles/778179.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
bottom waste
bottom ashes
bio-mass combustion
bio-mass
fluidized-bed boiler
bio-tests
phytotests
energy wastes
furnace waste
Opis:
The bottom waste obtained from bio-mass burning shows a huge variability of chemical and physical properties, depending on the kind of bio-mass, the type of a cauldron and burning parameters. The huge variability of the bottom ashes from the incineration plant and co-combustion of bio-mass makes it difficult to find any way to its management. In reality, only the bottom ashes from coal combustion and the small amount from lignite combustion are used, mainly in the building industry and in mining industry. The article presents the initial research, concerning the estimation of the properties of the bottom ashes obtained from bio-mass congestion in the fluidized-bed boiler to use them safely for the environment. To determine the influence of the tested waste on plants, a number of pot experiments have been conducted. The plants which have been used are recommended for phytotoxicity estimation, and are also used for biological reclamation.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 2; 33-37
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Top-Down and Bottom-Up Urban and Regional Planning: Towards a Framework for The Use of Planning Standards
Autorzy:
Pissourios, Ioannis A
Powiązania:
https://bibliotekanauki.pl/articles/623697.pdf
Data publikacji:
2014-06-06
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
top-down
bottom-up
planning theory
planning standards
Opis:
The purpose of this paper is to discuss the ways that the top-down and the bottom-up approaches to planning can be combined in the practice of planning standards. In the first part, the paper examines the utilization of planning standards through time, while in the second part it aims to unravel the relationship between the use of planning standards and the top-down as well as the bottom-up planning approach. In the third part, the paper focuses on the limitations of bottom-up approaches, in order to demonstrate that they can only be used in a certain planning scale, leaving all other scales to top-down approaches. Last but not least, the paper proposes a framework for the use of planning standards in a combined top-down and bottom-up planning approach.
Źródło:
European Spatial Research and Policy; 2014, 21, 1
1231-1952
1896-1525
Pojawia się w:
European Spatial Research and Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nowa technologia usuwania antropogenicznych osadów dennych
New removal technology of anthropogenic bottom deposits
Autorzy:
Eymontt, A.
Wierzbicki, K.
Powiązania:
https://bibliotekanauki.pl/articles/239155.pdf
Data publikacji:
2013
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
pogłębiarka
osady denne
reologia
separator
hydrotransport
dredger
bottom deposits
rheology
hydromixture transport
Opis:
W pracy przedstawiono opis projektu nowej, przyjaznej środowisku technologii usuwania antropogenicznych osadów z dna zbiorników wodnych, rzek, kanałów, rowów melioracyjnych i stawów rybnych. Podczas wydobywania tych osadów będzie następowało znacznie mniejsze ich rozluźnienie, a tym samym uzyska się możliwość większej koncentracji składnika stałego pochodzenia organicznego lub mineralnego, a następnie rozdzielenia ziaren pochodzenia mineralnego większych od 1 mm. Asumptem do podjęcia realizacji omawianego projektu były wieloletnie doświadczenia uzyskane w trakcie badania różnego rodzaju pogłębiarek wydobywających osady antropogeniczne, w tym prowadzonych wspólnie z Uniwersytetem Przyrodniczym we Wrocławiu. Urządzeniami wyróżniającymi się dużą innowacyjnością w tym projekcie są: – pogłębiarka poruszająca się po dnie pod powierzchnią wody, wyposażona w zgarniacz osadów i pompy wyporowe typu Mohno, które umożliwią transport hydromieszaniny na znaczne odległości; – sekwencyjny separator części stałych z hydromieszaniny, umożliwiający oddzielenie ziaren pochodzenia mineralnego większych od 1 mm. Oba te urządzenia są zarejestrowane w Polskim Urzędzie Patentowym. Realizacja projektu umożliwi bardziej racjonalne wykorzystanie wydobytej i odpowiednio rozdzielonej hydromieszaniny w znanych liniach technologicznych, służących do produkcji nawozów organicznych lub energii cieplnej bądź elektrycznej. Ponadto wydobycie osadów zapobiegnie zagniwaniu zawartych w nich części organicznych, a tym samym umożliwi rozwój turystyki i rekreacji w miejscach obecnie niedostępnych.
Paper presents a project of new, environment friendly technology concerning the removal of anthropogenic deposits from the bottom of water reservoirs, rivers, channels, melioration ditches and the fish ponds. Such deposits will be much less relaxed at the extraction, thus making possible stronger concentration of solid components – organic and mineral particles, and next the separation of mineral origin particles larger than 1 mm. Grounds to assuming the project were many years’ experience gained from investigations of various types of dredging’s, as well as the studies conducted jointly with the University of Environmental and Life Sciences in Wrocław. Distinctive by large innovation in the project were: – dredger moving on the bottom, beneath the water surface, equipped with sludge scraper and the Mohno type positive displacement pumps, which make possible hydraulic transport of the hydromixture over long distances; – sequential separator of solids to eliminate from hydromixture the particles of mineral origin, larger than 1 mm. Both above mentioned divices have been registered in the Polish Patent Office. The project will enable more rational usage of properly extracted and separated hydromixture in the well-known technological lines for production of organic fertilizers, or the energy (thermal or electrical) generation. Moreover, sediment extraction will prevent the putrescibility of contained there organic parts.
Źródło:
Problemy Inżynierii Rolniczej; 2013, R. 21, nr 4, 4; 129-138
1231-0093
Pojawia się w:
Problemy Inżynierii Rolniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sorption of cations by bottom sediments of Lake Wicko
Autorzy:
Trojanowski, J.
Trojanowska, C.
Moczulska, A.
Powiązania:
https://bibliotekanauki.pl/articles/84867.pdf
Data publikacji:
1998
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
cation sorption
bottom sediment
Lake Wicko
lake
sorption complex
cation
physical analysis
chemical analysis
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 1998, 02
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of sea bottom using uniform rectangular Bézier pieces
Autorzy:
Makar, A.
Powiązania:
https://bibliotekanauki.pl/articles/331828.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
In the article the essence of uniform rectangular Bézier pieces have been shown. These issues are essential during creation the digital terrain model DTM. For creation the bottom model bathymetric surveys of Motlawa River have been used. The visualization of the bottom using uniform rectangular Bézier pieces has been presented.
Źródło:
Hydroacoustics; 2011, 14; 143-148
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Artificial neural networks for shape modeling of sea bottom
Autorzy:
Balicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/332457.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
Artificial neural networks are applied for approximation and interpolation of function with multiple variables. Because of concurrent processing of data by neurons, fhis approach can be seen as promising alternate for standard algorithms. From these reasons, the analysis of capabilities for some models of neural networks has been carried out in the purpose for modeling the shape of sea bottom. The feed-forward multi-layer networks with different transfer functions have been tested. These networks have been trained by backpropagation algorithm and its versions with some improvements. Moreover, the gradient optimization technique by Levenberg-Marquardt has been applied. Finally, for determination of the depth in a point of the water area the two-layer network with the hidden layer of the radial neurons has been proposed.
Źródło:
Hydroacoustics; 2007, 10; 1-8
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania płytkich zbiorników wodnych za pomocą metody GPR
GPR investigation of shallow water reservoirs
Autorzy:
Karczewski, J.
Ziętek, J.
Powiązania:
https://bibliotekanauki.pl/articles/183610.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
GPS
metoda georadarowa
sub-bottom profiler
osady denne
GPR
bottom sediment
Opis:
In the paper, the applicability of the GPR method for shallow depths investigations is presented. Factors which have essential influence on GPR measurements quality are shown. Measurement techniques used in such investigations are discussed with special regard to GPS application. Results obtained for different reservoirs are shown. To compare, results from sub-bottom profiler are included.
Źródło:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2009, 35, 2/1; 437-443
0138-0974
Pojawia się w:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies