Citations with the tag: OPTICAL mineralogy

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  • Optical mine exploitation by geometric analysis.
    Schurtz, Robert A.; Stephens, G.A. // Engineering & Mining Journal (00958948); Nov93, Vol. 194 Issue 11, p16L 

    Describes the Optical Mine Exploitation by Geometric Analysis (OMEGA). Application of geometry on nonlinear programming projects; Use and application of OMEGA; Efficiency in mining explorations; Capacity constraints.

  • Optical Mineralogy: Theory and Technique (Book).
    Wylie, Ann G. // American Scientist; Nov/Dec88, Vol. 76 Issue 6, p612 

    Reviews the book "Optical Mineralogy: Theory and Technique," vol. 1, by Ernest Ehlers.

  • Optical Mineralogy in a Modern Earth Sciences Curriculum.
    Reinhardt, Jürgen // Journal of Geoscience Education; Jan2004, Vol. 52 Issue 1, p60 

    Optical mineralogy is a subject firmly integrated into geoscience programs that offer mineralogy and petrology modules. Polarized-light microscopy remains a powerful and cost-effective analytical method, both at the educational and the professional level. It is the ideal analytical tool for the...

  • Optical Mineralogy (Book).
    Dietrich, R.V. // American Scientist; Jul/Aug81, Vol. 69 Issue 4, p457 

    Reviews the non-fiction book 'Optical Mineralogy: The Nonopaque Minerals,' by W. Revell Phillips and Dana T. Griffen.

  • Enhancing sensitivity of a whispering gallery mode biosensor by subwavelength confinement.
    Gaathon, O.; Culic-Viskota, J.; Mihnev, M.; Teraoka, I.; Arnold, S. // Applied Physics Letters; 11/27/2006, Vol. 89 Issue 22, p223901 

    The authors demonstrate enhanced sensitivity of a spherical whispering gallery mode biosensor (WGMB) by confining orbiting light near the surface using a subwavelength (sub-λ) high refractive index layer on a fluorine doped silica microsphere (radius R∼200 μm). Their experiments at a...

  • Focusing properties of a rectangular-rod photonic-crystal slab.
    Shuai Feng; Zhi-Yuan Li; Zhi-Fang Feng; Kun Ren; Bing-Ying Cheng; Dao-Zhong Zhang // Journal of Applied Physics; 9/15/2005, Vol. 98 Issue 6, p063102 

    The focusing properties of a photonic-crystal (PC) slab consisting of a square lattice of rectangular dielectric rods in the air background are studied theoretically. We employ the finite-difference time-domain method to investigate the field patterns of a point source placed in the vicinity of...

  • Tunable defect mode in a three-dimensional photonic crystal.
    Mertens, G.; Wehrspohn, R. B.; Kitzerow, H.-S.; Matthias, S.; Jamois, C.; Gösele, U. // Applied Physics Letters; 12/12/2005, Vol. 87 Issue 24, p241108 

    Three-dimensionally periodic structures made of macroporous silicon with varying pore diameter show a photonic stop band in the middle infrared spectral range. A discontinuity of the periodic pore width modulation forms a planar optical resonator with a corresponding transmission peak in the...

  • An unusual emerald with conical growth features.
    Choudhary, Gagan // Gems & Gemology; 2005, Vol. 41 Issue 3, p265 

    The article discusses the gemological properties of an unusual emerald with conical growth features submitted to the Gem Testing Laboratory in Jaipur, India for identification. Gemological microscopy showed strong color zoning in parallel layers, and some of the planes contained conical growth...

  • Catalogue of Human Tissue Optical Properties at Terahertz Frequencies.
    Fitzgerald, A.J.; Berry, E.; Zinov'ev, N.N.; Homer-Vanniasinkam, S.; Miles, R.E.; Chamberlain, J.M.; Smith, M.A. // Journal of Biological Physics; Apr2003, Vol. 29 Issue 2/3, p123 

    Recently published studies suggest that terahertz pulsed imaging will have applications in medicine and biology, but there is currently very little information about the optical properties of human tissue at terahertz frequencies. Such information would be useful for predicting the feasibility...

  • MOONSTONE Imitations.
    S. F. M. // Gems & Gemology; 2006, Vol. 42 Issue 2, p167 

    The article discusses the gemological properties of a 3.92 carat cushion shape moonstone imitation that was submitted to the West Coast laboratory for identification. Microscopic examination revealed that an obvious separation plane parallel to the girdle identified the stone was assembled. It...

  • A large greenish yellow grossular from Africa.
    Hainschwang, Thomas; Notari, Franck // Gems & Gemology; 2005, Vol. 41 Issue 4, p352 

    The article discusses the gemological properties of a 68.55 carat greenish yellow grossular from Africa examined at the Gemological Institute of America (GIA) Gem Tech Lab. Gemological testing showed a refractive index (RI) of 1.743 and the specific gravity measured hydrostatically was 3.62....

  • Bandgap energies and refractive indices of Pb[sub 1-x]Sr[sub x]Se.
    Majumdar, A.; Xu, H. Z.; Zhao, F.; Keay, J. C.; Jayasinghe, L.; Khosravani, S.; Lu, X.; Kelkar, V.; Shi, Z. // Journal of Applied Physics; 2/1/2004, Vol. 95 Issue 3, p939 

    Optical transmission measurements were carried out on Pb[sub 1-x]Sr[sub x]Se samples, grown by molecular beam epitaxy, with different Sr compositions (x) ranging from 0 to 1. Refractive indices were calculated for all the samples at room temperature and at 77 K by fitting the transmittance data....

  • Polymers doped with metal oxide nanoparticles with controlled refractive index.
    Obreja, Paula; Cristea, Dana; Purica, Munizer; Gavrila, Raluca; Comanescu, Florin // Polimery; 2007, Vol. 52 Issue 9, p679 

    Polymer nanocomposites for optical applications, with controlled refractive index in the range 1.46-1.78 were prepared by chemical route and sol-gel process, starting from poly(methylmethacrylate) (PMMA), hydroxyethylmethacrylate (HEMA), polyvinyl alcohols (PVA-1 and PVA-2) and metal oxides from...

  • Short Courses.
    Obreja, Paula; Cristea, Dana; Purica, Munizer; Gavrila, Raluca; Comanescu, Florin // GSA Today; Jun2015, Vol. 25 Issue 6, p29 

    A calendar of short courses offered at the Geological Society of America's Annual Meeting to be held in Baltimore, Maryland is presented including Applications of Commercial Satellite Imagery for Polar Science, Supporting Student Success in Geoscience Programs and Quantitative Optical Mineralogy.

  • A Strategy for Teaching an Effective Undergraduate Mineralogy Course.
    Swope, R. Jeffrey; Gieré, Reto // Journal of Geoscience Education; Jan2004, Vol. 52 Issue 1, p15 

    An effective undergraduate mineralogy course provides students with a familiarity and understanding of minerals that is necessary for studying the Earth. This paper describes our strategy for integrating the disparate topics covered in a mineralogy course and for presenting them in a way that...

  • The Polarized Light Microscope: Should We Teach the use of a 19th Century Instrument in the 21st Century?
    Gunter, Mickey E. // Journal of Geoscience Education; Jan2004, Vol. 52 Issue 1, p34 

    The polarizing light microscope (PLM) has no doubt contributed more to our knowledge of minerals and rocks than any other single instrument. Then why is the use of the PLM, and the teaching of optical mineralogy in general, decreasing? Probably one of the main reasons is educators seek to...

  • Immersion Microscopy for Ceramics Green Compact.
    Sato, Kazuyoshi; Abe, Hiroya; Naito, Makio; Saito, Yutaka; Uematsu, Keizo; Hotta, Tadashi // American Ceramic Society Bulletin; Jan2006, Vol. 85 Issue 1, p17 

    The article focuses on immersion microscopy for ceramics green compact. The liquid immersion method is widely applicable for various ceramic materials. To obtain both adequate optical transparency and contrast, an immersion liquid with an appropriate refractive index must be used. It should have...

  • What is the real role of iron oxides in the optical properties of dust aerosols?
    Zhang, X. L.; Wu, G. J.; Zhang, C. L.; Xu, T. L.; Zhou, Q. Q. // Atmospheric Chemistry & Physics; 2015, Vol. 15 Issue 21, p12159 

    Iron oxide compounds constitute an important component of mineral dust aerosols. Several previous studies have shown that these minerals are strong absorbers at visible wavelengths and thus that they play a critical role in the overall climate perturbation caused by dust aerosols. When compiling...

    Zhang, X. L.; Wu, G. J.; Zhang, C. L.; Xu, T. L.; Zhou, Q. Q. // SciTech Book News; Mar2008, Vol. 32 Issue 1, p50 

    The article reviews several books related to geology including "Dungeness and Romney Marsh; barrier dynamics and marshland evolution," edited by Antony J. Long, "Mineralogy and optical mineralogy," by Melinda Darby Dyar and Mickey E. Gunter and "Post-perovskite; the last mantle phase...

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