Kaksi silinterinen Archimedes

kuv., 25 x 21 cm

Neuvoja Archimedes tasapainomoottorin hoitamisessa

kuv., 12 x 19 cm

Mainoskirje Archimedes tasapainomoottorista

14 x 22 cm

Archimedes yleismoottori

kuv., 21 x 24 cm

Hintaluettelo Archimedes ulkolaitamoottorin varaosista

kuv., 12 x 22 cm

Archimedes kevytpainomoottori

kuv., 22 x 27 cm

Neuvoja Archimedes tasapainomoottorin hoitamisesta

kuv., 12 x 17 cm

Käsikirja ulkolaitamoottori Archimedes a-mallin hoidolle

kuv., 12 x 18 cm

Relativistic Archimedes law for fast moving bodies and the general-relativistic resolution of the submarine paradox

We investigate and solve in the context of general relativity the apparent paradox which appears when bodies floating in a background fluid are set in relativistic motion. Suppose some macroscopic body, say, a submarine designed to lie just in equilibrium when it rests (totally) immersed in a certain background fluid. The puzzle arises when different observers are asked to describe what is expected to happen when the submarine is given some high velocity parallel to the direction of the fluid surface. on the one hand, according to observers at rest with the fluid, the submarine would contract and, thus, sink as a consequence of the density increase. on the other hand, mariners at rest with the submarine using an analogous reasoning for the fluid elements would reach the opposite conclusion. The general relativistic extension of the Archimedes law for moving bodies shows that the submarine sinks. As an extra bonus, this problem suggests a new gedankenexperiment for the generalized second law of thermodynamics.

Kreis-Messung des Archimedes von Syrakus : nebst dem dazu gehörigen Kommentare des Eutokius von Askalon : griechisch und deutsch /

Includes bibliographical references.

Verfassungsurkunde der gerechten und vollkommenen Freimaurerloge Archimedes zu den drei Reissbretern in Altenburg.

Mode of access: Internet.

Archimedes,

Bibliography: p.57.

Characterization Of Morphology And Composition Of Inorganic Fillers In Dental Alginates.

Energy dispersive X-ray spectroscopy microanalysis (EDX), scanning electron microscopy (SEM), and Archimedes' Principle were used to determine the characteristics of inorganic filler particles in five dental alginates, including Cavex ColorChange (C), Hydrogum 5 (H5), Hydrogum (H), Orthoprint (O), and Jeltrate Plus (JP). The different alginate powders (0.5 mg) were fixed on plastic stubs (n = 5) and sputter coated with carbon for EDX analysis, then coated with gold, and observed using SEM. Volume fractions were determined by weighing a sample of each material in water before and after calcining at 450(°)C for 3 h. The alginate materials were mainly composed of silicon (Si) by weight (C-81.59%, H-79.89%, O-78.87%, H5-77.95%, JP-66.88%, wt). The filler fractions in volume (vt) were as follows: H5-84.85%, JP-74.76%, H-70.03%, O-68.31%, and C-56.10%. The tested materials demonstrated important differences in the inorganic elemental composition, filler fraction, and particle morphology.

Diagnóstico da Educação Ambiental no ensino de Geografia: Piracicaba, Capivari and Jundiaí hidrographic basins

The goals of this study are to identify the potencialities avaiable in elementary public schools for the development of an educational process wich includes environmental issues helpping to find its integration with university in order to contribuite raises teaching levels for a better comprehension of regional environmental problems. Research data were collected through questionnaires and interviews with geography teachers analyising theirs activities and perspectives on the environmental crisis and environmental education. The study also offers sugestions for the devellopment of interdisciplinaires programs trying to contibute for the construction of citizenship showing the importance of better comprehension from environmental problems which includes physical, economics, social, political and cultural aspects.