Wyniki wyszukiwania - Biblioteka Nauki

1

A note on absolute approximate retracts

100%

Martin J.

Bulletin of the Polish Academy of Sciences. Mathematics

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2001

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tom Vol. 49, no 4

355--359

EN

The notion of an absolute approximate retract for a class Q of topological spaces (or an AAR(Q)-space) generalizes the concept of an absolute retract for the class Q. For many classes Q, it is shown that AAR(Q)-spaces are preserved under retraction mappings and that a fully normal AAR(Q)-space X must be contractible and can be expressed as a product of finite-dimensional compacta if and only if X is homeomorphic to a cube or is a finite-dimensional AR-space.

2

Epiphytic lichens diversity and chemistry in Scots pine forests along the transect from Northern Finland to Southern Poland

63%

Martin L. , Martin J.

Polish Journal of Ecology

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2003

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tom Vol. 51, nr 4

507-511

EN

Along the north-south transect crossing much of the distribution of the Pinus sylvestris forests in Europe, 22 epiphytic macrolichen species were identified. Three of them Hypogymnia physodes, Imshaugia aleurites and Parmeliopsis ambigua had wide distribution. Analysis of chemical element contents in H.physodes and corresponding pine bark samples demonstrated relatively high correlation. Elements such as copper, nickel, cadmium, sodium and phosphorus had higher concentrations at the Kevo (FN1) site and lead, iron and sulphur content was higher at Polish forest sites in southern part of the transect.

3

Epiphytic lichens diversity and chemistry on Scots pine forests along the transect from Northern Finland to Southern Poland

63%

Martin L. , Martin J.

Polish Journal of Ecology

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2003

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tom 51

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nr 4

EN

Along the north-south transect crossing much of the distribution of the Pinus sylvestris forests in Europe, 22 epiphytic macrolichen species were identified. Three of them, Hypogymnia physodes, Imshaugia aleurites and Parmeliopsis ambigua had wide distribution. Analysis of chemical element contents in H. physodes and corresponding pine bark samples demonstrated relatively high correlation. Elements such as copper, nickel, cadmium, sodium and phosphorus had higher concentrations at the Kevo (FN1) site and lead, iron and sulphur content was higher at Polish forest sites in southern part of the transect.

4

Divisional and regenerative morphogenesis in the Hypotrichous ciliate, Histriculus sp.

51%

Nieto J. J. , Calvo P. , Martin J. , Torres A.

Acta Protozoologica

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1984

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tom 23

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nr 4

5

Wirusy z rodzaju Carlavirus infekujace ziemniaka [Solanum tuberosum L.] i ich pokrewienstwo z wirusami M i S ziemniaka

51%

Chrzanowska M. , Kerlan C. , Martin J.

Roczniki Akademii Rolniczej w Poznaniu. Ogrodnictwo

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2000

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tom 30

17-25

6

Soil acidification and nutrient sustainability of forest ecosystems in the northeastern German lowlands - Results of the national forest soil inventory

51%

Riek W. , Russ A. , Martin J.

Folia Forestalia Polonica. Series A . Forestry

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2012

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tom 54

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nr 3

7

Landscape-abundance relationships of male Eastern Wild Turkeys Meleagris gallopavo silvestris in Mississippi, USA

38%

Davis A. , Wang G. , Martin J. , Belant J. , Butler A. , Rush S. , Godwin D.

Acta Ornithologica

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2017

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tom 52

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nr 2

8

Reaction mechanisms of alcohols on aluminum surfaces

38%

Wiltord F. , Martin J. , Le Mogne T. , Jarnias F. , Querry M. , Vergne P.

Tribologia

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2006

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tom nr 6

7-20

EN

The general aim of this work concerns the study of the lubricant/surface interaction mechanisms, such as those occurring during aluminum cold rolling in the presence of fatty alcohols. To improve the understanding of alcohol tribochemical reactions on an aluminum surface, friction tests followed by SIMS analyses were conducted. Deuterated alcohols were used to investigate the formation of bonds between the aluminum surface and alcohol molecules. The combination of SIMS analysis and the use of deuterated molecules have enabled us to propose a reaction mechanism between alcohols and the initial oxidized aluminum surface. This mechanism later affects the tribological behavior of the interface. In agreement with previous observations, we showed that a low steric size increases the number of acting molecules on the oxidized surface and that the alkyl chain length is of importance to protect the surface and hence reduce friction. These two key points can be easily explained by the proposed reaction pathway.

PL

Celem niniejszej pracy było zbadanie mechanizmów oddziaływań układu środek smarowy/powierzchnia, które między innymi mają miejsce podczas walcowania na zimno aluminium w obecności alkoholi tłuszczowych. Produkty tribochemicznych reakcji alkoholi, zachodzące na powierzchni aluminium, badano za pomocą spektrometrii masowej jonów wtórnych (SIMS). Aby zbadać tworzenie się wiązań pomiędzy powierzchnią aluminiową a cząsteczkami alkoholu, zastosowano deuterowane alkohole. Połączenie techniki SIMS oraz deuterowanych cząsteczek pozwoliło zaproponować mechanizm reakcji alkoholi i utlenionej powierzchni aluminium. Mechanizm ten wyjaśnia wpływ alkoholi na tribologiczne zachowanie się warstw wierzchnich współpracujących elementów. Zgodnie z poczynionymi wcześniej obserwacjami wykazano, że mniejszy rozmiar przeszkody sterycznej zwiększa liczbę oddziałujących cząsteczek z utlenioną powierzchnią, a także, że długość łańcucha alkilowego pełni istotną rolę w ochronie powierzchni i tym samym redukcji tarcia. Te dwa kluczowe aspekty można łatwo wytłumaczyć za pomocą zaproponowanych procesów tribochemicznych.

9

Differences in host-ant specificity between Spanish, Dutch and Swedish populations of the endangered butterfly, Maculinea alcon [DENIS et SCHIFF.] [Lepidoptera]

38%

Elmes G. W. , Thomas J. A. , Hammarstedt O. , Munguira M. L. , Martin J. , Made J. G.

Memorabilia Zoologica

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1994

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tom 48

55-68

10

Wpływ ptaszyńca na fermy niosek i wykorzystanie PARALICE w walce z inwazją

26%

Marzin D. , Martin J.

Hodowca Drobiu

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2010

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nr 05

11

Dobre zarzadzanie zwieksza rentownosc

26%

Martin J.

Top Agrar Polska

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2006

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nr 05 Top Bydlo

22-23