Minerals of California
... crystal in fine large aggregates have been found in many of the gold mines . Mokelumne Hill , Green Mountain gravel mine near Murphy , Angels and West Point have pro- duced large crystals . El Dorado County : Rock crystal , phantom crystals ...
Photonic Crystals
... crystal waveguides fabricated from thin films, but it also applies to photonic crystal buried waveguides fabri- cated from bulk substrates. In such cases, three-dimensional calculations need to be performed, for instance by using three ...
Liquid Crystals
... crystal molecules . Figure 1.13 illustrates both of these types of liquid crystal polymers . Nematic , chiral nematic , and smectic phases have been found in polymers , with some pos- sessing more than one liquid crystal phase . Their ...
Constitutive Equations of Nonlinear Electromagnetic-Elastic Crystals
... Crystal Class 1 = { I , τC } . 89 7.2 . Magnetic Crystal Class m = { I , TR3 } 90 7.3 . Magnetic Crystal Class 2 = { 1 , TD3 } 91 7.4 . Magnetic Crystal Class 2 / m = { I , TD3 , R3 , τC } . 91 7.5 . Magnetic Crystal Class 2 / m = { I ...
Phononic Crystals
... crystal - 1D locally - resonant sonic crystal 308 - 2D locally - resonant phononic crystal 304 , 314 - 2D locally - resonant sonic crystal 311 - 3D locally - resonant phononic crystal 303 - Locally - resonant phononic crystal slab of ...
Crystal Structures
This classic text is devoted to describing crystal structures, especially periodic structures, and their symmetries. Updated material prepared by author enhances presentation, which can serve as text or reference. 1996 edition.
Crystals and Crystallinity in Polymers
... crystal is at the center , and the needlelike crystals are overgrowths along the two edges of the single crystal . ( B ) SAED pattern from the region a indicated in ( A ) , encompassing the central crystal of a - form and needlelike ...
Snow Crystals
... crystal pic- tures on the following pages shows markings of one kind or another . These are not places set apart from their surroundings by distinct colors , for the crystal is everywhere colorless , but places that so disperse the ...
Group Theoretical Methods and Applications to Molecules and Crystals
... crystal system B is subordinate to a crystal system A ( this is denoted by A ⇒ B ) if 1. the symmetry point group B is a subgroup of the symmetry group A , and ... crystal classes 313 13.5 The 32 crystal classes and the lattice types.
Journal of the Royal Geological Society of Ireland
... crystals was exposed throughout its length , a plate of the matrix having been carefully removed . The length of the crystal is 14 millimetres , and the greatest breadth , 4.2 millimetres . The crystal is a very well - defined six ...
Journal of the Franklin Institute
... crystal analysis , W. H. and W. L. Bragg , 1 and the recent articles of Debye and Sherrer 2 and the author . The principle underlying all the different so - called methods of X - ray crystal analysis is the same . It consists in ...
Natural History
... crystal whose symmetry is ex- pressed in a dif- ferent way . The drawing at the top of page 165 is of a crystal of zircon , a silicate of zircon- ium . We see at once that this crystal is not nearly so perfect in symmetry as the ...
Scientific Papers of the Bureau of Standards
... crystal was drawn from the melt the desired orientation could be produced . At the beginning of growth the an- gle between the longitudinal axis of the wire and the hexagonal axis of the crystal was 90 ° . As the crystal was ...
Chemical Abstracts
... crystal the crystal particles of the end members are present in unaltered state and their influence is in consequence purely additive , is the behavior of such isomorphous mixed crystals on crystallizing from their melts . The ...
Philosophical Magazine
... crystal . So. far. ,. it. has. not. been. ascertained. whether. the. treatment affects the natural frequency and damping of the crystal , but it is quite possible that these properties are affected by the degree of dryness of the crystal .
New York State Education Department Bulletin
... crystal of zircon , c - c being an axis of tetragonal symmetry indicated by the sign a Fig . 21 d Hexagonal symmetry is shown when a crystal occupies the same position in space six times during one complete revolution about the axis ...
Transactions of the Institution of Mining & Metallurgy
... crystal shape , if one accepts as a crystal , or fragment of a crystal , only those grains which in polarized light work as a unit , and are distinguishable from others which polarize as an aggregate . Under the microscope they suggest ...
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science
... crystals in a group , and not the symmetry of each individual considered alone , is to be taken into account in a systematic classification of crystals , the reply is in the negative - the grouping of crystal individuals has always been ...
Sugar Central and Planters News
... crystal- lization . When crystallization starts , the film of liquid surrounding each crystal is super- saturated with sucrose . The continued growth of the crystal soon exhausts the excess of suc- rose in the surrounding film of syrup ...
The Engineering Index
... crystal ; determination of the melting temperature of a crystal lamella independent of its thickness . Drawing . Practical Crystal Drawing , Mary W. Porter . Am . Mineralogist , vol . 5 , no . 5 , May 1920 , pp . 89-95 , 21 figs ...