Studio portrait of unidentified soldier in military uniform; Darmstadt Portraits Men

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Fini Loewenthal with Justin Loewenthal in uniform; Regensburg Portraits Men

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Herman Sommerfeld (center) with other reserve soldiers in military uniform Portraits Men

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Herman Sommerfeld (center) with other soldiers in military uniform Portraits Men

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Herman Sommerfeld (right) in military uniform with an unidentified soldier Portraits Men

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Studio portrait of Herman Sommerfeld in military uniform Portraits Men

Handwritten on verso: Zur Erinnerung an meiner ? Zeit, Dein Hermann, Flughafen-Doberitz, Zum austuecken bereit

Studio portrait of Dr. Moritz Kroner in military uniform.

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Studio portrait of Dr. Moritz Kroner (center) with two unidentified men in military uniform.

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Portrait of Dr. William Levison in military uniform Portraits Men

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K-Ar ages of biotite and muscovite from Pangong metamorphic complex, Shyok suture zone, India: Implications for the youngest post-collision metamorphic event in Ladakh Himalaya

The garnet-kyanite-staurolite and garnet-biotite-staurolite gneisses were collected from a locality within Lukung area that belongs to the Pangong metamorphic complex in Shyok valley, Ladakh Himalaya. The kyanite-free samples have garnet and staurolite in equilibrium, where garnets show euhedral texture and have flat compositional profile. On the other hand, the kyanite-bearing sample shows equilibrium assemblage of garnet-kyanite-staurolite along with muscovite and biotite. In this case, garnet has an inclusion rich core with a distinct grain boundary, which was later overgrown by inclusion free euhedral garnet. Garnet cores are rich in Mn and Ca, while the rims are poor in Mn and rich in Fe and Mg, suggesting two distinct generations of growth. However, the compositional profiles and textural signature of garnets suggests the same stage of P -T evolution for the formation of the inclusion free euhedral garnets in the kyanite-free gneisses and the inclusion free euhedral garnet rims in the kyanite-bearing gneiss. Muscovites from the four samples have consistent K-Ar ages, suggesting the cooling age (∼ 10 Ma) of the gneisses. These ages make a constraint on the timing of the youngest post-collision metamorphic event that may be closely related to an activation of the Karakoram fault in Pangong metamorphic complex.

Studio portrait of Leopold Landsberger in military uniform, before the Verdun battle of World War I.

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Studio portrait of unidentified Levy brother (most likely Arthur or Hermann) in military uniform; Nogent-Sur-Seine, France.

Photographer's imprint lower left corner

Prediction of Breakdown Voltages of Binary Gas Mixtures in Uniform Electric Fields

A simple equation to predict the breakdown voltages for binary mixtures (Vmix) of electronegative gases (SF6, CCl2F2) and buffer gases (N2, N2O, CO2, air) under uniform electric field has been proposed. Values of Vmix evaluated using this equation for mixtures of SF6-N2, SF6-air, SF6-N2O, SF6-CO2 and CCl2F2-N2 over a wide range of pd show an excellent agreement with the experimentally measured data available in the literature.

Studio portrait of Benno Strauss in military uniform after being drafted to fight on the front during World War I at the age of thirty-nine.

Father of Herbert Strauss