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Optimal selection of the stations describing the global sea level pressure field

100%

Makra L., Stachò L., Department of Climatology J. A. U. S., Bolyai Institute J. A. U. S.

Acta Universitatis Lodziensis. Folia Geographica Physica

1999

vol. 3

Przedmiotem badań jest ustalenie na podstawie danych, ile stacji pomiarowych określa średni rozkład pola ciśnienia na poziomie morza dla stycznia z żądaną dokładnością, jakimi danymi dysponują oraz jak wygląda ich przestrzenny rozkład. Artykuł zawiera opis nowej metody optymalnego wyboru stacji pomiarowych dla celów sieci obserwacyjnej.

The subject of the study is to examine on a data base, how many measuring stations determine the global mean January sea level pressure field significantly with a given accuracy, how much information they have, furthermore what their spatial distribution is like, The paper contains a new method for optimal selection of measuring stations from an observing network.

The yield condition in the mobilization of yield-stress materials in distensible tubes

70%

Sochi T.

Open Physics

2014

vol. 12

issue 8

532-540

In this paper we investigate the yield condition in the mobilization of yield-stress materials in distensible tubes. We discuss the two possibilities for modeling the yield-stress materials prior to yield: solid-like materials and highly-viscous fluids and identify the logical consequences of these two approaches on the yield condition. Our results reveal that these two modeling approaches have far reaching consequences on the yield bottleneck and hence should be critically examined in the light of experimental evidence. As part of this investigation we derive an analytical expression for the pressure field inside a distensible tube with a Newtonian flow using a one-dimensional Navier-Stokes flow model in conjunction with a pressurearea constitutive relation based on elastic tube wall characteristics. This analytical expression has wider applicability than in the identification of the yield condition of yield-stress material.

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1 Acta Universitatis Lodziensis. Folia Geographica Physica

1 Open Physics

1 2014

1 1999

1 Bolyai Institute J. A. U. S.

1 Department of Climatology J. A. U. S.

1 Makra L.

1 Sochi T.

1 Stachò L.

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Optimal selection of the stations describing the global sea level pressure field

The yield condition in the mobilization of yield-stress materials in distensible tubes