Autor: Przybyszewski, H. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Methods of mineral engineering in a fight against Varrosa infestation
Metody inżynierii mineralnej w walce z chorobą pszczół Varrozą
Autorzy:: Pawlikowski, M.
Przybyszewski, H.
Stępień, L.
Powiązania:: https://bibliotekanauki.pl/articles/344051.pdf
Data publikacji:: 2017
Wydawca:: nakł. Maciej Pawlikowski
Tematy:: bees
Varrose
mineral engineering
pszczoły
Varroza
inżynieria mineralna
Opis:: The purpose of previous study centered around introducing minerals into bee colonies was to observe the Varrosa destructor mites-repelling effect of minerals (“Pszczelarstwo” 6/2016). The results of research published so far confirmed the purpose of using minerals in the fight against Varroa infestation. This publication presents partial results of the next stage of research.
Wykonano eksperymentalne badania wykorzystania wybranych minerałów do walki z choroba pszczół – varrozą. Minerały mieszano z woskiem pszczelim formując woskowe węzy, które umieszczano w ramkach w ulach.. Stwierdzono, że węzy mineralne sprzyjają wyprowadzaniu varrozy z uli. Zaobserwowano także, że w węzach mineralnych prawidłowo rozwijają si® młode pszczoły oraz, że do uli z tymi węzami pszczoły znoszą do 30 % więcej miodu.
Źródło:: Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering; 2017, 23; 1-6
1689-6742
Pojawia się w:: Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Charakterystyka chemiczna gleb i szaty roślinnej użytków zielonych w dolinie ujścia Warty
Chemical characteristics of soils and vegetation cover of grasslands in the Warta estuary valley
Autorzy:: Czyż, H.
Malinowski, R.
Kitczak, T.
Przybyszewski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1818957.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: charakterystyka chemiczna
szata roślinna
chemical characterisation
vegetation
Opis:: Alluvial soils, which are found under the grasslands in the study area, are formed by erosive and sedimentation activity of waters from surface and river flows. These waters in river valleys, depending on the activity duration, flow speed and the frequency of overflows, determine the spatial distribution of sediments, the variability of their mechanical composition, as well as the layers thickness, the content of organic matter and the diversity of the lay of alluvial material areas. The mentioned factors have significant influence on the structure of soil profile and on the elements circulation in the trophic chain: soil – water – plant – animal – human. The aim of the study was the typological identification of soils in the floodplain of the Warta estuary valley, as well as the characterization of their basic physical and chemical features, with the special consideration to contamination with heavy metals. Moreover, the chemical content of the plant communities in the study area was described. The studies were conducted in the Warta valley on the passage between Świerkocin and Kłopotowo, on grasslands which are part of the right flood terrace of the valley, between the water surface and the levee (floodbank). Objects of varied habitat conditions and vegetation were isolated on the chosen area for the specific research .The characterization of soil conditions was performed according to the methods commonly used in pedology. Based on the description of morphological features of soil pits, the following subtypes of alluvial soils were distinguished: heavy humus, medium brown, actual medium, actual very light. Shaped plant communities were qualified to the following floristic types: Glyceria maxima, Phalaris arundinacea, Poa trivialis, Poa pratensis, Festuca rubra and Corynephorus cannescens. The analyzed soils were evaluated as rich in general forms: P, K, Mg, Ca, Na i S. Compacted soils were usually rich in absorbable phosphorus, the content of absorbable magnesium was from very low to high, while in very light soils the content of phosphorus and magnesium was law. Regardless of the soil type, the content of absorbable potassium found in all soil samples was very low. The analyzed soils had the natural content of heavy metals (Cd, Co, Cu, Ni, Pb, Zn, Mn, Fe), only in surface layer of heavy humus alluvial soil high contamination with cadmium and raised contamination with zinc were found. Varied content of macroelements was found in the grassland sward of the individual study points. The richest in P, K, Mg, Ca and Na was the community of rough bluegrass (Poa trivialis), located on river actual medium alluvial soil in the vicinity of embankment and subject to the constant flooding of Warta. The poorest in the analyzed heavy metals were the communities of Poa pratensis and Festuca rubra with Corynephorus cannescens on actual very light alluvial soil. Only in case of lead, high content in the sward of Phalaris arundinacea formed on actual medium alluvial soil near the water surface was found. As regards other heavy metals there was no excess of their content in the grassland sward of the studied area.
Źródło:: Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 1; 694-713
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Tytuł:: WiMAX Cell Level Simulation Platform Based on ns-2 and DSP Integration
Autorzy:: Flizikowski, A.
Kozik, R.
Gierszal, H.
Przybyszewski, M.
Hołubowicz, W.
Powiązania:: https://bibliotekanauki.pl/articles/226960.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: FEC codes
nb-LDPC
DSP
integrated platform
ns-2
Opis:: The WiMAX (Worldwide Interoperability for Microwave Access) system based on the IEEE 802.16 family of standards is a promising technology for last-mile access. Both IEEE 802.16 and 3GPP-LTE systems candidate for becoming the 4G network of choice. The need to evaluate multiple performance enhancing techniques like MIMO, OFDM(A), novel channel coding schemes like non-binary LDPC codes, together with development of standards like IEEE 802.21, that aims at enabling handover and interoperability between heterogeneous network types, make rapid prototyping-based simulations an important issue. This paper presents a novel approach to 4G-oriented simulation environment that integrates popular network simulator (ns-2) and a Digital Signal Processing (DSP) to enable comprehensive link layer and cell level simulations. Proposed simulation environment is intended as an evaluation platform for assessing QoS/QoE and Connection Admission Control (CAC) algorithms designed for WiMAX systems. Moreover we study ways to improve simulation time (with focus on AWGN channel simulation) by using CUDA parallel processing technology for NVIDIA graphic cards.
Źródło:: International Journal of Electronics and Telecommunications; 2010, 56, 2; 169-176
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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