scholarly journals POLE FIGURE EVALUATION OF CRYSTAL ORIENTATION OF ORTHOGONAL-BIAXIALLY STRETCHING POLYVINYL ALCOHOL

1972 ◽  
Vol 28 (7) ◽  
pp. 231-245
Author(s):  
Sadao Hibi ◽  
Matsuo Maeda ◽  
Takashi Indo ◽  
Tomonori Kakizawa ◽  
Shunji Nomura ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Pole Figure ◽  
Crystal Orientation ◽  
Biaxially Stretching

scholarly journals ORIENTATION EVALUATION OF CRYSTALLINE PHASE AND NONCRYSTALLINE PHASE OF ORTHOGONAL-BIAXIALLY STRETCHING POLYVINYL ALCOHOL

1972 ◽  
Vol 28 (7) ◽  
pp. 246-258 ◽  
Author(s):  
Sadao Hibi ◽  
Matsuo Maeda ◽  
Takashi Indo ◽  
Masaharu Mizuno ◽  
Shunji Nomura ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Crystalline Phase ◽  
Biaxially Stretching ◽  
Noncrystalline Phase

Orientations – perfectly colored

2016 ◽  
Vol 49 (5) ◽  
pp. 1786-1802 ◽  
Author(s):  
G. Nolze ◽  
R. Hielscher
Keyword(s):  
Symmetry Group ◽  
Pole Figure ◽  
Crystal Orientation ◽  
Inverse Pole Figure ◽  
Major Goal ◽  
Matlab Toolbox ◽  
Orientation Data ◽  
Crystal Direction ◽  
Higher Symmetries ◽  
Point Groups

The inverse pole figure (IPF) coloring for a suitable evaluation of crystal orientation data is discussed. The major goal is a high correlation between encoding color and crystal orientation. Revised color distributions of the fundamental sectors are introduced which have the advantages of (1) being applicable for all point groups, (2) not causing color discontinuities within grains, (3) featuring carefully balanced regions for red, cyan, blue, magenta, green and yellow, and (4) an enlarged gray center in opposition to a tiny white center. A new set of IPF color keys is proposed which is the result of a thorough analysis of the colorization problem. The discussion considers several topics: (a) the majority of presently applied IPF color keys generate color discontinuities for specifically oriented grains; (b) if a unique correlation between crystal direction and color is requested, discontinuity-preventing keys are possible for all point groups, except for {\overline 4}, {\overline 3} and {\overline 1}; (c) for a specific symmetry group several IPF color keys are available, visualizing different features of a microstructure; and (d) for higher symmetries a simultaneous IPF mapping of two or three standard reference directions is insufficient for an unequivocal orientation assignment. All color keys are available in MTEX, a freely available MATLAB toolbox.

scholarly journals Analysis and modeling of the growth of intermetallic compounds in aluminum–steel joints

RSC Advances ◽  
2017 ◽  
Vol 7 (60) ◽  
pp. 37797-37805 ◽  
Author(s):  
Gang Zhang ◽  
ManJiao Chen ◽  
Yu Shi ◽  
Jiankang Huang ◽  
Fuqian Yang
Keyword(s):  
Intermetallic Compounds ◽  
Pole Figure ◽  
Crystal Orientation ◽  
Welding Zone ◽  
Steel Joints ◽  
Simulation Time

EBSD mapping of a welding zone ((A) image of crystal orientation, (B) pole figure, (C and D) EBSD color, black-white images of the joint); variation of the thickness of the Fe2Al5 IMC layer with the simulation time.

Microstructural Characterization of an Oriented Silicalite Film

1996 ◽  
Vol 454 ◽  
Author(s):  
M. C. Lovallo ◽  
M. Tsapatsis
Keyword(s):  
Pole Figure ◽  
Crystal Orientation ◽  
Membrane Surface ◽  
Microstructural Characterization ◽  
X Ray Diffraction ◽  
Channel Networks ◽  
X Ray ◽  
Pure Silica ◽  
Molecular Sieving

ABSTRACTThe crystal orientation of a submicron silicalite membrane is examined using standard x-ray diffraction and pole-figure analyses. Results indicate that the crystals in the molecular sieving layer are preferentially oriented with both straight and sinusoidal channel networks of the zeolite parallel to the membrane surface. This requires that transport across the membrane proceed down the c-axis of the crystals which can occur by jumping between the two channel networks. EDAX data confirms that the molecular sieving layer is the pure silica zeolite silicalite.

Spherulitic crystal growth in the prodissoconch larval of Crassostrea virginica

1983 ◽  
Vol 41 ◽  
pp. 518-519
Author(s):  
George G. Cocks ◽  
Louis Leibovitz ◽  
DoSuk D. Lee
Keyword(s):  
Crystal Structure ◽  
Crassostrea Virginica ◽  
Crystal Orientation ◽  
Developmental Changes ◽  
Gastrula Stage ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Stages Of Growth ◽  
Early Stages ◽  
Initial Deposition

Our understanding of the structure and the formation of inorganic minerals in the bivalve shells has been considerably advanced by the use of electron microscope. However, very little is known about the ultrastructure of valves in the larval stage of the oysters. The present study examines the developmental changes which occur between the time of conception to the early stages of Dissoconch in the Crassostrea virginica(Gmelin), focusing on the initial deposition of inorganic crystals by the oysters.The spawning was induced by elevating the temperature of the seawater where the adult oysters were conditioned. The eggs and sperm were collected separately, then immediately mixed for the fertilizations to occur. Fertilized animals were kept in the incubator where various stages of development were stopped and observed. The detailed analysis of the early stages of growth showed that CaCO3 crystals(aragonite), with orthorhombic crystal structure, are deposited as early as gastrula stage(Figuresla-b). The next stage in development, the prodissoconch, revealed that the crystal orientation is in the form of spherulites.

The Interpretation of Crystal Lattice Images

1972 ◽  
Vol 30 ◽  
pp. 550-551
Author(s):  
J. M. Cowley ◽  
Sumio Iijima
Keyword(s):  
Crystal Orientation ◽  
Diffraction Theory ◽  
Phase Changes ◽  
Electron Wave ◽  
Crystal Lattices ◽  
Heavy Atoms ◽  
Lattice Images ◽  
The Right ◽  
Intuitive Interpretation ◽  
Suitable Approximation

The imaging of detailed structures of crystal lattices with 3 to 4Å resolution, given the correct conditions of microscope defocus and crystal orientation and thickness, has been used by Iijima (this conference) for the study of new types of crystal structures and the defects in known structures associated with fluctuations of stoichiometry. The image intensities may be computed using n-beam dynamical diffraction theory involving several hundred beams (Fejes, this conference). However it is still important to have a suitable approximation to provide an immediate rough estimate of contrast and an evaluation of the intuitive interpretation in terms of an amplitude object.For crystals 100 to 150Å thick containing moderately heavy atoms the phase changes of the electron wave vary by about 10 radians suggesting that the “optimum defocus” theory of amplitude contrast for thin phase objects due to Scherzer and others can not apply, although it does predict the right defocus for optimum imaging.

Cryogels based on composition chitosan–polyvinyl alcohol: synthesis and properties

2019 ◽  
Vol 5 (4) ◽  
pp. 56-63
Author(s):  
E.V. Dikhtiaruk ◽  
◽  
V.V. Paientko ◽  
A.K. Matkovsky ◽  
Yu.N. Nichiporuk ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Alcohol Synthesis
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