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Wyszukujesz frazę "sea shell" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Microstructural Characterization and Mechanical Behavior of Copper Matrix Composites Reinforced by B4C and Sea Shell Powder
Autorzy:
Sankar, M.
Pradeep Devaneyan, S.
Peter Pushpanathan, D.
Myszka, D.
Powiązania:
https://bibliotekanauki.pl/articles/106969.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Cu-base MMC
Sea Shell Powder-B4C Reinforcement
wear properties
microstructure
Opis:
This paper investigates the microstructural and mechanical properties of copper metal matrix composites reinforced with B4C and crushed sea shell particles (fabricated using powder metallurgy). In powder form, copper is widely used in structural applications. Copper also possesses very good electrical and thermal conductivity, ductility, and corrosion resistance. B4C is the third-hardest-known material that also possesses excellent toughness and wear resistance. Sea shells are readily available along coastal areas. Therefore, an attempt has been made in this work to investigate the feasibility of its utilization in powder metallurgy. Two batches of samples were prepared. In the first batch, the percentage of boron carbide and copper powder were varied, and seashell powder was not included. In the second batch, the percentages of B4C, copper, and sea shell powder were varied in order to assess the change effected by the sea shell material. The sintered samples of both batches were subjected to microstructural characterization to ascertain the homogeneous distribution of the reinforcements. The microhardness and wear resistance of all of the fabricated samples were assessed. The results confirmed that the inclusion of 2% sea shell powder (by weight) with 10% boron carbide improved the wear resistance and hardness of the composite.
Źródło:
Journal of Casting & Materials Engineering; 2018, 2, 1; 24-29
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aragonitic rostra of the Turonian belemnitid Goniacamax: arguments from diagenesis
Autorzy:
Dauphin, Y
Williams, C.T.
Barskov, I.S.
Powiązania:
https://bibliotekanauki.pl/articles/20211.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Turonian
sea shell
Cephalopoda
belemnite
calcite
Goniocamax
rostrum
skeleton
sea cephalopod
diagenesis
paleoenvironment
freshwater shell
Belemnitida
aragonite
Siberia
belemnitid rostrum
Piasina River
paleontology
Opis:
The hypothesis that belemnitid rostra are formed by primary biogenic low−Mg calcite is widespread. However, the coexistence in the same rostrum of both aragonitic and calcitic components has been reported in true belemnites (Goniocamax, Turonian). A combined microstructural and chemical composition study of the comparison of shells with undisputed mineralogy from the same site as the Turonian Goniocamax, shows that these aragonitic shells display the effects of diagenetic alteration. These observations favour the hypothesis that belemnite rostra are composed of primary aragonite, rather than low−Mg calcite, and are consistent with all other cephalopod shells. Calcitic and aragonitic rostra are also known in other Dibranchiata such as Triassic Aulacocerida and Eocene Belopterina. Diagenetic changes such as shown here may clearly affect palaeo−environmental interpretations based on carbonate shells.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scrobicularia plana in Holocene deposits of the S Baltic coast
Autorzy:
Wojciechowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/83511.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
Scrobicularia plana
shell
occurrence
habitat
Holocene
deposit
Baltic coast
Baltic Sea
Źródło:
Folia Malacologica; 1999, 07, 4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The content of heavy metals in shells of Mytilus sp. from the Adriatic, Baltic and Black seas
Autorzy:
Gal, A.
Guzik, M.
Kuczkowska-Kuzniar, A.
Formicki, G.
Stawarz, R.
Powiązania:
https://bibliotekanauki.pl/articles/84122.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
heavy metal content
shell
Mytilus
salt water mussel
marine bivalve mollusc
animal species
Adriatic Sea
Baltic Sea
Black Sea
statistical analysis
Źródło:
Folia Malacologica; 2012, 20, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of recent and chalcolithic period environmental pollution using Mytilus galloprovincialis Lamarck, 1819 from Yarimburgaz Cave, the Northern Marmara Sea and Bosphorus coasts
Autorzy:
Barut, I.F.
Meric, E.
Yokes, M.B.
Powiązania:
https://bibliotekanauki.pl/articles/47682.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
geochemistry
Mytilus galloprovincialis
shell
monitoring
metal pollution
environment pollution
Yarimburgaz Cave
Marmara Sea
Bosphorus coast
Źródło:
Oceanologia; 2016, 58, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chamelea gallina in the coastal waters of the Anapa bay bar (the Black Sea) as a carbonate sediment producer
Autorzy:
Kosyan, A.R.
Divinsky, B.V.
Powiązania:
https://bibliotekanauki.pl/articles/47884.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Chamelea gallina
biomass
population
shell length
coastal water
bivalve
carbonate sediment
Anapa Bay
Black Sea
Źródło:
Oceanologia; 2019, 61, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biogeochemical alteration of the benthic environment by the zebra mussel Dreissena polymorpha (Pallas)
Autorzy:
Zaiko, A.
Paskauskas, R.
Krevs, A.
Powiązania:
https://bibliotekanauki.pl/articles/47856.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
Curonian Lagoon
Dreissena polymorpha
benthic macroinvertebrate
biogeochemical alteration
ecosystem
mineralization
nitrogen
nutrient
oxygen consumption
phosphorus
sediment
shell
zebra mussel
Opis:
The aim of this study was to verify whether the biogeochemical features (e.g. concentration of nutrients, oxygen consumption, mineralization rate, Eh) of sediments changed by the zebra mussel or its shell deposits differ from those in the ambient soft bottom, and how these differences are related to the structure of benthic macroinvertebrates. In 2006 three sampling sessions were carried out in the Curonian Lagoon, SE Baltic Sea, at three pre-defined sites, corresponding to different bottom types: zebra mussel bed, zebra mussel shell deposits and bare soft sediments. Similarity analysis of biogeochemical parameters indicated that bottom sediments covered with zebra mussel shell deposits were rather distinct from the other bottom types because of the lowest total organic matter mineralization rate and highest organic carbon, total phosphorus and total nitrogen content. The parameters measured in the zebra mussel bed did not deviate conspicuously from the values observed in bare bottoms, except for the higher rate of oxygen consumption in the upper sediment layer. Unsuitable anoxic conditions on the one hand and the ‘attractive’ shelters provided by zebra mussels on the other hand may promote the epifaunal life style in the habitats formed by dense zebra mussel clumps.
Źródło:
Oceanologia; 2010, 52, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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