Although all crystals are extracted from the earth in their natural state, some crystals are cut and polished before retail sale. That is why some crystals are described as 'natural', meaning 'unpolished' whereas others are described according to their appearance e.g. polished point, wand, sphe...
SALTS OF THE EARTH FOR THE LAST CENTURY, CHEFS FAVORED A CLEAN, UNIFORM FLAVOR ENHANCER. NOW, A HOST OF SPECIALTY CRYSTALS ALLOW THEM TO MATCH INGREDIENTS TO PARTICULAR DISHES.Emily Shartin, Globe Correspondent
Advances in analytical geochemistry have made it possible to determine precisely the concentration of many trace elements and their isotopes in rocks. These data provide the cornerstone for geochemical models of the Earth and terrestrial planets. However, our understanding of how trace elements behave ...
Growth of Mixed Rare Earth Tartrate Crystals (Y(1-x)Sm_x)_2(C_4H_4O_6)_3·zH_2O from Silica Gels Experiments performed on the grwth of mixed crystals of rare earth tartrates (Y1-xSmx)2 (C4H4O6)3.zH2O (0≤x≤1) ... A Jain,PNKotru,MLKaul - 材料科学技术(英文版) 被引量:...
Optical cryocoolers made of luminescent solids are very promising for many applications in the fields of optical telecommunications, aerospace industry, bioimaging, and phototherapy. To the present day, researchers have employed a number of crystal and glass host materials doped with rare-earth ions (...
The computed phase boundaries obt... YG Yu,Z Wu,RM Wentzcovitch - 《Earth & Planetary Science Letters》 被引量: 140发表: 2008年 Thermodynamic properties of MgSiO3 majorite and phase transitions near 660 km depth in MgSiO3 and Mg2SiO4: A first principles study [1] Thermodynamic properties...
The NASA mission Perfect Crystals used the microgravity environment on the International Space Station (ISS) to grow crystals of human manganese superoxide dismutase (MnSOD)—an oxidoreductase critical for mitochondrial vitality and human health. The mission’s overarching aim is to perform neutron prote...
Transmission electron microscopy was used to investigate the cluster formation of trivalent rare earth (RE) ions in wide band gap dielectric crystal hosts with atomic resolution. Various defects and areas with variation in chemical composition with dimensions of 5nm were observed. This finding sets th...
NaCl crystals grown by the evaporation of an aqueous salt solution in microgravity on the International Space Station (ISS) were characterized and compared to salt crystals grown on earth. NaCl crystallized as thin wafers in a supersaturated film of 200–700μm thickness and 50mm diameter, or as...
Single crystal X-ray diffraction studies reveal the structures of the doped crystals to be tetragonal implying that the incorporation of the dopants has not changed the structure of the parent crystal. The diffraction planes were identified and indexed by powder diffraction analysis. High-resolution X...