Cryogenic, high power, near diffraction limited, Yb:YAG slab laser

A cryogenic slab laser that is suitable for scaling to high power, while taking full advantage of the improved thermo-optical and thermo-mechanical properties of Yb:YAG at cryogenic temperatures is described. The laser uses a conduction cooled, end pumped, zigzag slab geometry resulting in a near diffraction limited, robust, power scalable design. The design and the initial characterization of the laser up to 200W are presented.Miftar Ganija, David Ottaway, Peter Veitch and Jesper Munc

The Treasure of the Egyptian Queen Ahhotep and International Relations at the Turn of the Middle Bronze Age (1600–1500 BCE)

The burial of Queen Ahhotep represents one of the most significant finds in Near Eastern Archaeology. A gilded coffin and a trove of magnificent jewels and objects belonging to a queen named Ahhotep was discovered at Dra Abu el-Naga, in Western Thebes by Auguste Mariette in 1859 along with a sumptuous group of jewels and elaborately decorated ceremonial objects. Many of the objects associated with the burial bore the names of Kings Ahmose and Kamose of the end of the Second Intermediate Period and the beginning of the New Kingdom and reflected the influence of the Aegean and of Nubia. The treasure caused a sensation when it was exhibited in Paris in 1867 at the International Exhibition and helped Mariette to convince the government of Egypt that a national museum should be built. Despite its importance, the treasure has never been fully published and much new research on the various aspects of the find have not been collected into a combined study until now. This volume, following a conference on the subject at the annual meeting of the American Society of Overseas Research (ASOR) in Denver on November 17, 2018, has assembled scholars from the world over and details the circumstances of the treasure’s discovery, its history of display and publication, both the technical and artistic aspects of the individual elements of the material, a review of the history and burial practices of the period and how Ahhotep and the treasure fits into them

Heart-scarabs in the transition between the Second Intermediate Period and the early Eighteenth Dynasty: BMFA 72.1346

The heart scarab of king Sobekemsaf in the British Museum is one of the earliest and most familiar examples of heart scarabs, but a long unrecognized parallel to this famous scarab can be found in the collection of the Department of Ancient Egyptian, Nubian and Near Eastern Art of the Ancient World Section of the Museum of Fine Arts, Boston (BMFA 72.1346). The scarab represents an important transitional type in the evolution of the heart-scarab between the end of the Second Intermediate Period and the mid Eighteenth Dynasty

The first record of a neonatal ornithopod dinosaur from Gondwana

Discrete post-embryonic teeth and bone fragments have been recovered from the matrix with the holotype skeleton (MPM‐10001) of the ornithopod dinosaur, Talenkauen santacrucensis Novas et al., 2004 (Upper Cretaceous, Argentina). The minute tooth crowns are 1 mmapicobasally tall and 1.7 mmmesodistally wide. The crowns are symmetrical and have a centrally located primary ridge on the lingual surface. Secondary ridges lead to five marginal denticles on both teeth. The tooth morphology is consistent with dentary teeth in euiguanodontids. There is no evidence of transport, suggesting that the material is autochthonous with respect to the adult body block of T. santacrucensis (MPM‐10001). Steeply inclined wear facets on the lingual surface and associated microstriae support the conclusion that the minute teeth were from a post-embryonic euiguanodontid dinosaur rather than early stage replacement teeth. The morphology, size, and wear of the teeth and small bone fragments found in the body block ofMPM‐10001 suggest that this material belongs to a neonatal T. santacrucensis. This is the first record of neonatal ornithopod remains from Gondwana.Fil: Egerton, Victoria M. . Drexel University; Estados Unidos. University Of Manchester; Reino UnidoFil: Novas, Fernando Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales; ArgentinaFil: Dodson, Peter. State University Of Pennsylvania; Estados UnidosFil: Lacovara, Kenneth. Drexel University; Estados Unido