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Relevant bibliographies by topics / Diffraction patterns

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Academic literature on the topic 'Diffraction patterns'

Author: Grafiati

Published: 4 June 2021

Last updated: 24 January 2023

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Journal articles on the topic "Diffraction patterns"

1

Gupta, Vipul K., and Sean R. Agnew. "Indexation and misorientation analysis of low-quality Laue diffraction patterns." Journal of Applied Crystallography 42, no. 1 (2009): 116–24. http://dx.doi.org/10.1107/s0021889808042349.

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A Laue X-ray diffraction pattern indexing scheme, similar to a method previously proposed for convergent beam and backscattered electron diffraction patterns, was implemented. Experimental diffraction patterns are compared with simulated templates corresponding to crystals of prescribed orientations. The orientation of a diffracting volume is determined by maximizing a normalized cross correlation index between experimental and theoretical patterns. The advantages of template matching include (i) elimination of the requirement for extensive peak search/fitting analysis; (ii) the ability to index overlapped diffraction patterns obtained from neighboring grains or second phase particles; and (iii) the ability to confidently index patterns of low quality. A best fit orientation can then be determined by a least-squares fitting approach based on singular value decomposition. The misorientation within a diffracting volume is calculated from `smeared' and/or `split' Laue patterns. The methodologies developed are illustrated using micro-Laue diffraction data obtained from the wake of a fatigue crack.

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Rioux, Frank. "Calculating diffraction patterns." European Journal of Physics 24, no. 3 (2003): N1—N3. http://dx.doi.org/10.1088/0143-0807/24/3/401.

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DePino, Andrew. "Unusual diffraction patterns." Physics Teacher 25, no. 4 (1987): 219–20. http://dx.doi.org/10.1119/1.2342224.

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Wright, S. I. "Automatic idexing of electron-backscatter diffraction patterns." Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 598–99. http://dx.doi.org/10.1017/s0424820100170724.

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A typical Backscatter Kikuchi Diffraction pattern (BKD, also referred to in the literature as an EBSP or a BEKP) is shown in figure 1. Since the bands in the pattern represent planes in the diffracting volume, the lattice orientation can be determined from their geometrical arrangement. The task of correctly orienting a BKD can be broken into two parts: 1) finding the salient features in the pattern (either the diffraction bands or the intersections of the bands) and 2) using these features to determine the lattice orientation. Recent advances in feature detection in BKDs along with methods for digital image enhancement will be described in some detail. The determination of orientation from a set of detected bands (or intersections of bands) will also be discussed.Dingley has demonstrated that lattice orientation can be practically obtained from BKDs by imaging the diffraction patterns using a low light level video camera and indexing the patterns with the aid of an online computer.

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Lee, R. A., D. F. Lynch, and I. J. Wilson. "Diffraction Patterns of Generalized Curvilinear Diffraction Gratings." Optica Acta: International Journal of Optics 32, no. 5 (1985): 573–93. http://dx.doi.org/10.1080/713821766.

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Hurley, Noah, Steve Kamau, Khadijah Alnasser, Usha Philipose, Jingbiao Cui, and Yuankun Lin. "Laser Diffraction Zones and Spots from Three-Dimensional Graded Photonic Super-Crystals and Moiré Photonic Crystals." Photonics 9, no. 6 (2022): 395. http://dx.doi.org/10.3390/photonics9060395.

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The laser diffraction from periodic structures typically shows isolated and sharp point patterns at zeroth and ±nth orders. Diffraction from 2D graded photonic super-crystals (GPSCs) has demonstrated over 1000 spots due to the fractional diffractions. Here, we report the holographic fabrication of three types of 3D GPSCs through nine beam interferences and their characteristic diffraction patterns. The diffraction spots due to the fractional orders are merged into large-area diffraction zones for these three types of GPSCs. Three distinguishable diffraction patterns have been observed: (a) 3 × 3 Diffraction zones for GPSCs with a weak gradient in unit super-cell, (b) 5 × 5 non-uniform diffraction zones for GPSCs with a strong modulation in long period and a strong gradient in unit super-cell, (c) more than 5 × 5 uniform diffraction zones for GPSCs with a medium gradient in unit super-cell and a medium modulation in long period. The GPSCs with a strong modulation appear as moiré photonic crystals. The diffraction zone pattern not only demonstrates a characterization method for the fabricated 3D GPSCs, but also proves their unique optical properties of the coupling of light from zones with 360° azimuthal angles and broad zenith angles.

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McCarthy, G. J., J. M. Holzer, W. M. Syvinski, K. J. Martin, and R. G. Garvey. "Evaluation of Reference X-ray Diffraction Patterns in the ICDD Powder Diffraction File." Advances in X-ray Analysis 34 (1990): 369–76. http://dx.doi.org/10.1154/s0376030800014683.

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AbstractProcedures and tools for evaluation of reference x-ray powder patterns in the JCPDSICDD Powder Diffraction File are illustrated by a review of air-stable binary oxides. The reference patterns are evaluated using an available microcomputer version of the NBS*A1DS83 editorial program and PDF patterns retrieved directly from the CD-ROM in the program's input format. The patterns are compared to calculated and experimental diffractograms. The majority of the oxide patterns have been found to be in good agreement with the calculated and observed diffractograms, but are often missing some weak reflections routinely observed with a modern diffractometer. These weak reflections are added to the PDF pattern. For the remainder of the phases, patterns are redetermined.

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Liu, Hongwei, Matthew Foley, Qingyun Lin, and Jiangwen Liu. "EDP2XRD: a computer program for converting electron diffraction patterns into X-ray diffraction patterns." Journal of Applied Crystallography 49, no. 2 (2016): 636–41. http://dx.doi.org/10.1107/s1600576716000613.

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Mny commercial software packages for X-ray diffraction pattern analysis are capable of identifying multiple phases in bulk materials. However, X-ray diffraction patterns cannot record those phases with very small volume ratio or non-homogeneous distribution, which may mean that researchers have to use instead electron diffraction patterns from a very small region of interest. EDP2XRD, a new program for converting electron diffraction patterns into X-ray diffraction patterns, is described here. The program has been developed in order to utilize X-ray analysis software for electron diffraction patterns taken from mixed-phase nanocrystalline materials with a transmission electron microscope. It is specifically designed for material researchers who are engaged in crystallographic microstructure analysis. The difference from other popular commercial software for crystallography is that this program provides new options to convert and plot X-ray diffraction patterns for arbitrary electron diffraction rings and to process raw images to enhance conversion performance. The program contains the necessary crystallographic calculator to list planar d spacings and corresponding X-ray diffraction angles.

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Andrés, P., J. Lancis, E. E. Sicre, and E. Bonet. "Achromatic Fresnel diffraction patterns." Optics Communications 104, no. 1-3 (1993): 39–45. http://dx.doi.org/10.1016/0030-4018(93)90102-b.

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Smith, Deane K., Gerald G. Johnson, Alexandre Scheible, Andrew M. Wims, Jack L. Johnson, and Gregory Ullmann. "Quantitative X-Ray Powder Diffraction Method Using the Full Diffraction Pattern." Powder Diffraction 2, no. 2 (1987): 73–77. http://dx.doi.org/10.1017/s0885715600012409.

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AbstractA new quantitative X-ray powder diffraction (QXRPD) method has been developed to analyze polyphase crystalline mixtures. The unique approach employed in this method is the utilization of the full diffraction pattern of a mixture and its reconstruction as a weighted sum of diffraction patterns of the component phases. To facilitate the use of the new method, menu-driven interactive computer programs with graphics have been developed for the VAX series of computers. The analyst builds a reference database of component diffraction patterns, corrects the patterns for background effects, and determines the appropriate reference intensity ratios. This database is used to calculate the weight fraction of each phase in a mixture by fitting its diffraction pattern with a least-squares best-fit weighted sum of selected database reference patterns.The new QXRPD method was evaluated using oxides found in ceramics, corrosion products, and other materials encountered in the laboratory. Experimental procedures have been developed for sample preparation and data collection for reference samples and unknowns. Prepared mixtures have been used to demonstrate the very good results that can be obtained with this method.

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Dissertations / Theses on the topic "Diffraction patterns"

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Mackenzie, R. A. D. "Computer analysis of electron backscatter diffraction patterns." Thesis, University of Bristol, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373724.

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Basinger, John A. "Detail Extraction from Electron Backscatter Diffraction Patterns." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2689.

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Cross-correlation based analysis of electron backscatter diffraction (EBSD) patterns and the use of simulated reference patterns has opened up entirely new avenues of insight into local lattice properties within EBSD scans. The benefits of accessing new levels of orientation resolution and multiple types of previously inaccessible data measures are accompanied with new challenges in characterizing microscope geometry and other error previously ignored in EBSD systems. The foremost of these challenges, when using simulated patterns in high resolution EBSD (HR-EBSD), is the determination of pattern center (the location on the sample from which the EBSD pattern originated) with sufficient accuracy to avoid the introduction of phantom lattice rotations and elastic strain into these highly sensitive measures. This dissertation demonstrates how to greatly improve pattern center determination. It also presents a method for the extraction of grain boundary plane information from single two-dimensional surface scans. These are accomplished through the use of previously un-accessed detail within EBSD images, coupled with physical models of the backscattering phenomena. A software algorithm is detailed and applied for the determination of pattern center with an accuracy of ~0.03% of the phosphor screen width, or ~10µm. This resolution makes it possible to apply a simulated pattern method (developed at BYU) in HR-EBSD, with several important benefits over the original HR-EBSD approach developed by Angus Wilkinson. Experimental work is done on epitaxially-grown silicon and germanium in order to gauge the precision of HR-EBSD with simulated reference patterns using the new pattern center calibration approach. It is found that strain resolution with a calibrated pattern center and simulated reference patterns can be as low as 7x10-4. Finally, Monte Carlo-based models of the electron interaction volume are used in conjunction with pattern-mixing-strength curves of line scans crossing grain boundaries in order to recover 3D grain boundary plane information. Validation of the approach is done using 3D serial scan data and coherent twin boundaries in tantalum and copper. The proposed method for recovery of grain boundary plane orientation exhibits an average error of 3 degrees.

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Baba-Kishi-Zadeh, K. "Crystallographic information from electron back-scattering diffraction patterns." Thesis, University of Bristol, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375379.

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Rogvall, Johanna. "The sensitivity of the EMC algorithm to the light intensity and amount of diffraction patterns in diffraction experiments." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448777.

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To understand the function of macromolecules like proteins it helps to know the structure of the molecule. Coherent diffraction imaging is an emerging method that might be used to figure out the structures of macromolecules. In this method diffraction patterns of the macromolecule are recorded by shining light on the molecule from many unknown orientations and detecting the pattern of the diffracted photons. By assembling the diffraction patterns in a specific way and finding the phase of the photons that gave rise to the diffraction patterns, it is theoretically possible to obtain the electronstructure of the molecule and thus the molecular structure. The assembling of several thousand diffraction patterns representing unknown orientations of the molecule is hard to do by hand, but there are several methods that can be used. The EMC (Expand-Maximize-Compress) algorithm is one of those methods. It is an iterative algorithm that tries to create a model describing the Fourier Transform of the electron density of the molecule by maximizing each diffraction patterns fit to the model. This work examines how sensitive the EMC algorithm is to datasets with few diffraction patterns or a low intensity of the light being diffracted by the molecule, for the proteins phytochrome and lysozyme. The result of the work could be used to make sure enough data in collected in real experiments. Diffraction patterns simulated with the program Condor is used in this work, instead of diffraction patterns from real experiments.EMC finds the correct model when the data set contains about 1/3 fewer photons for the smaller more symmetrical molecule lysozyme than it does for phytochrome. This might be because the shapes in lysozymes diffraction patterns are larger than in phyochrome’s patterns. For phytochrome the EMC algorithm assembled the diffraction patterns correctly, with fewest photons for the light intensity 0.764 J/μm2 and 1250 diffraction patterns. For lysozyme it was with an intensity 1.910 J/μm2 and 1425 diffraction patterns. More investigation of the data is needed to understand what factors that affect the EMC algorithms ability to assemble the diffraction patterns correctly.<br>För att förstå makromolekylers kemiska eller biologiska funktion so underlättar det om man känner till molekylens kemiska struktur. Med den nya tekniken “coherent diffraction imaging” ska det vara möjligt att lista ut makromolekylers struktur. I denna teknik detekterar man diffraktionsmönster av molekylen genom att belysa molekylen med ljus från många olika okända vinklar and registrera mönstret som skapas av det diffrakterade ljuset. Genom att sätta ihop alla dessa diffraktionsmönster på rätt sätt och sen återskapa fasen för ljuset i diffraktionsmönstret så kan man generera molekylens elektronstruktur och från elektronstrukturen kan man få tag i molekylens struktur. Att sätta ihop tio tusentals diffraktionsmönster med okända vinklar på rätt sätt är väldigt svårt att göra, men det finns flera olika metoder som kan användas. EMC (Expand-Maximize-Compress) är en sådan metod. EMC är en iterativ algoritm som skapar en modell av (Fourier transformen av) molekylens elektronstruktur genom att maximera hur bra diffraktionsmönstren passar med modellen. Detta arbete utreder hur bra EMC algoritmen är på att hitta rätt (Fourier transform av) elektronstruktur när väldigt få diffraktionsmönster används eller när intensiteten på ljuset som sprids av molekylen är lågt. Programmet Condor används för att generera teoretiska diffraktionsmönster för de 2 molekylerna lysozym och fytokrom. EMC används sedan med olika uppsättningar av intensitet och antal diffraktionsmönster för att skapa en modell av elektronstrukturen. EMC behövde ca 1/3 färre antal fotoner i sin modell för att hittar den rätta modellen av elektronstrukturen för den lilla symmetriskt formade molekylen lysozym än för fytokrom. Att det är lättare för EMC algoritmen att hitta den korrekta modellen för lysozym än fytokrom kan bero på att lysozyms diffraktionsmönster har större former/features eller på lysozyms storlek och form. EMC körningen som behövde minst antal fotoner för att hitta den korrekta elektronstrukturen för fytokrom hade intensiteten 0,764 J/μm2 på det inkommande ljuset och behövde 1250 diffraktionsmönster. För lysozym behövdes det 1,910 J/μm2 och 1425 diffraktionsmönster för att EMC algoritmen skulle hitta rätt modell av elektronstrukturen.

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Jinasena, W. H. "Simulation of Structure, Dynamics and Electron Diffraction Patterns of Heterogeneous Clusters ArmN2n." Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/JinasenaWH2002.pdf.

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Курбатов, Денис Ігорович, Денис Игоревич Курбатов, Denys Ihorovych Kurbatov, et al. "Raman and Photoluminescence Investigation of Films of Solid Solutions Zn1-xMnxTe." Thesis, Sumy State University Publishing, 2013. http://essuir.sumdu.edu.ua/handle/123456789/33900.

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In this paper, we have investigated some structural properties, Raman spectra and photoluminescence spectra of Zn1-xMnxTe films deposited by the closed space vacuum sublimation under different growth conditions. The obtained results of the Raman spectroscopy and XRD analysis show single phase composition of the samples. The presence of phonon replicas in the Raman spectra of the films indicates their high structural quality. The manganese content (about 7 %) in the layers was determined according to shifting the relative peaks positions. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33900

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Курбатов, Денис Ігорович, Денис Игоревич Курбатов, Denys Ihorovych Kurbatov, et al. "Raman and Photoluminescence Investigation of Films of Solid Solutions Zn1-xMnxTe." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35234.

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In this paper, we have investigated some structural properties, Raman spectra and photoluminescence spectra of Zn1-xMnxTe films deposited by the closed space vacuum sublimation under different growth con-ditions. The obtained results of the Raman spectroscopy and XRD analysis show single phase composition of the samples. The presence of phonon replicas in the Raman spectra of the films indicates their high structural quality. The manganese content (about 7 %) in the layers was determined according to shifting the relative peaks positions. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35234

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Herbison, Sarah. "Ultrasonic diffraction effects on periodic surfaces." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41180.

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Although the study of the interaction of acoustic and elastic waves with periodic surfaces and structures has a rich history dating back to Lord Rayleigh, it has recently been attracting new research efforts due to its value in the study of phononic crystals and in methods for ultrasonic non-destructive evaluation (NDE). The objective of the research described in this thesis is to provide new numerical and experimental tools capable of capturing important features that occur due to the diffraction of ultrasound on periodic solid surfaces. This thesis is divided into four main parts. First, the Rayleigh-Fourier (R-F) method will be used to simulate diffracted fields generated by structures containing multiple periodic surfaces and/or multiple solid layers. The second part of this thesis examines diffraction effects and compares ultrasonic NDE techniques for surfaces with imperfect periodicities. The third portion of this thesis focuses on one unusual phenomenon that has been observed on periodic surfaces, namely the lateral backward displacement of a bounded ultrasonic beam along the surface. This effect is currently understood to occur due to backward propagating surface waves that result from diffraction and mode conversion on the surface. The fourth and final part of this thesis describes the diffraction of bulk ultrasonic waves that can occur on the surfaces of phononic crystals.

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Wang, Feng [Verfasser]. "Inversion of dynamical scattering from large-angle rocking-beam electron diffraction patterns / Feng Wang." Ulm : Universität Ulm, 2017. http://d-nb.info/1131168097/34.

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Nimmer, Max [Verfasser]. "Spectral Imaging Based on 2D Diffraction Patterns and Robust Principal Component Analysis / Max Nimmer." München : Verlag Dr. Hut, 2019. http://d-nb.info/119641436X/34.

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Books on the topic "Diffraction patterns"

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Morawiec, Adam. Indexing of Crystal Diffraction Patterns. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11077-1.

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Turley, June W. X-ray diffraction patterns of polymers. International Centre for Diffraction Data (12 Campus Blvd., Newtown Square, 19073-3273), 1994.

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Dingley, D. J. Atlas of backscattering Kikuchi diffraction patterns. Institute of Physics Pub., 1995.

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Billinge, S. J. L., and M. F. Thorpe. Local structure from diffraction. Kluwer Academic, 2002.

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European Powder Diffraction Conference (7th 2000 Barcelona, Spain). EPDIC 7: Proceedings of the Seventh European Powder Diffraction Conference, held May 20-23, 2000 in Barcelona, Spain. Edited by Delhez R and Mittemeijer E. J. Trans Tech Publications, 2001.

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European Powder Diffraction Conference (5th 1997 Parma, Italy). EPDIC V: Proceedings of the Fifth European Powder Diffraction Conference, held May 25-28, 1997 in Parma, Italy. Edited by Delhez R and Mittemeijer E. J. Transtec Publications, 1998.

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European Powder Diffraction Conference (8th 2002 Uppsala, Sweden). EPDIC 8: Proceedings of the Eighth European Powder Diffraction Conference, held May 23-26, 2002 in Uppsala, Sweden. Edited by Andersson Yvonne, Mittemeijer E. J, and Welzel Udo. Trans Tech Publications, 2004.

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European Powder Diffraction Conference (4th 1995 Chester, England). European powder diffraction, EPDIC IV: Proceedings of the Fourth European Powder Diffraction Conference, held in Chester, England, July 1995. Edited by Cernik R. J, Delhez R, and Mittemeijer E. J. Transtec Publications, 1996.

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L, Billinge S. J., Thorpe M. F, and Conference on Local Structure from Diffraction (1997 : Traverse City, Mich.), eds. Local structure from diffraction. Plenum Press, 1998.

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W, Robinson David, and Reid Graeme T, eds. Interferogram analysis: Digital fringe pattern measurement techniques. Institute of Physics, 1993.

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Book chapters on the topic "Diffraction patterns"

1

Williams, David B., and C. Barry Carter. "Diffraction Patterns." In Transmission Electron Microscopy. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-2519-3_11.

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Williams, David B., and C. Barry Carter. "Indexing Diffraction Patterns." In Transmission Electron Microscopy. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-2519-3_18.

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Howard, S. A., and K. D. Preston. "8. PROFILE FITTING OF POWDER DIFFRACTION PATTERNS." In Modern Powder Diffraction, edited by David L. Bish and Jeffrey E. Post. De Gruyter, 1989. http://dx.doi.org/10.1515/9781501509018-011.

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Morawiec, Adam. "Indexing of Quasicrystal Diffraction Patterns." In Indexing of Crystal Diffraction Patterns. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11077-1_13.

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Morawiec, Adam. "Indexing of Powder Diffraction Patterns." In Indexing of Crystal Diffraction Patterns. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11077-1_7.

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Morawiec, Adam. "Basic Aspects of Crystal Diffraction." In Indexing of Crystal Diffraction Patterns. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11077-1_2.

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Morawiec, Adam. "Diffraction of High Energy Electrons." In Indexing of Crystal Diffraction Patterns. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11077-1_3.

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Nakasako, Masayoshi. "Phase Retrieval of Diffraction Patterns." In X-Ray Diffraction Imaging of Biological Cells. Springer Japan, 2018. http://dx.doi.org/10.1007/978-4-431-56618-2_7.

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Morawiec, Adam. "Multigrain Indexing." In Indexing of Crystal Diffraction Patterns. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11077-1_11.

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Morawiec, Adam. "An Excursion Beyond Diffraction by Periodic Crystals." In Indexing of Crystal Diffraction Patterns. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11077-1_12.

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Conference papers on the topic "Diffraction patterns"

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Khan, Saba Nashreen, S. Deepa, and P. Senthilkumaran. "Propagation of V-point singularity through diamond shape aperture." In JSAP-OSA Joint Symposia. Optica Publishing Group, 2019. http://dx.doi.org/10.1364/jsap.2019.18p_e215_3.

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Fraunhofer diffraction pattern is apparently Fourier transform of the aperture function. But when the beam possesses orbital angular momentum (OAM) it exhibits strangely different diffraction patterns that abides by charge conservation rule [1]. The azimuthally varying phase of scalar-field singularities effecting diffraction patterns has been rigorously discussed in the literature considering various shape of the apertures. This aspect has already been utilized in phase retrieval and OAM detection [1]. In this work, peculiar diffraction behaviour of vector-field singularities [2, 3], that are superposition of oppositely charged OAM beams in orthogonal polarized states, on passing through a diamond shaped aperture is investigated. Integrating spatially inhomogeneous polarization to the diffracting beams although increases the inherent complexity, unveils interesting polarization transformations.

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Clar, S., U. Papziner, and C. Stolte. "Correlation of diffraction patterns on georadargrams." In 56th EAEG Meeting. European Association of Geoscientists & Engineers, 1994. http://dx.doi.org/10.3997/2214-4609.201409998.

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Smith, Matthew H., and Don A. Gregory. "Rectangular pixel-based fractal diffraction patterns." In SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, edited by Friedrich O. Huck and Richard D. Juday. SPIE, 1995. http://dx.doi.org/10.1117/12.211984.

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Dmitrieva, L. A., Yu A. Kuperin, and N. M. Smetanin. "Differentiation of brain waves patterns in different states by multifractal analysis." In 2018 Days on Diffraction (DD). IEEE, 2018. http://dx.doi.org/10.1109/dd.2018.8552936.

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Ueno, Masahiro, Yoshiaki Kurokawa, Takaya Tanabe, and Manabu Yamamoto. "Fast method of computing Fresnel diffraction patterns." In International Conference on Optoelectronic Information Technologies, edited by Sergey V. Svechnikov, Volodymyr P. Kojemiako, and Sergey A. Kostyukevych. SPIE, 2001. http://dx.doi.org/10.1117/12.429703.

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Rakels, Jan H. "Computer Generated Diffraction Patterns Of Rough Surfaces." In 1988 International Congress on Optical Science and Engineering, edited by Hedzer A. Ferwerda. SPIE, 1989. http://dx.doi.org/10.1117/12.950372.

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Mukherjee, Asmita. "Diffraction Patterns in Deeply Virtual Compton Scattering." In Proceedings of the 17th International Spin Physics Symposium. AIP, 2007. http://dx.doi.org/10.1063/1.2750858.

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Ledesma, Silvia A., Claudio C. Iemmi, and Vera L. Brudny. "Diffraction patterns generated by conducting Cantor gratings." In Second Iberoamerican Meeting on Optics, edited by Daniel Malacara-Hernandez, Sofia E. Acosta-Ortiz, Ramon Rodriguez-Vera, Zacarias Malacara, and Arquimedes A. Morales. SPIE, 1996. http://dx.doi.org/10.1117/12.231059.

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Kelly, Damien P., Nail Sabitov, Thomas Meinecke, and Stefan Sinzinger. "Some considerations when numerically calculating diffraction patterns." In Digital Holography and Three-Dimensional Imaging. OSA, 2011. http://dx.doi.org/10.1364/dh.2011.dtuc5.

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Lancis, Jesus, Pedro Andres, and Enrique Tajahuerce. "Nearly wavelength-independent interference and diffraction patterns." In Optical Science and Technology, the SPIE 49th Annual Meeting, edited by Khan M. Iftekharuddin and Abdul Ahad S. Awwal. SPIE, 2004. http://dx.doi.org/10.1117/12.564638.

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Reports on the topic "Diffraction patterns"

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Glimm, J. Diffraction Patterns and Vortex Rollup. Defense Technical Information Center, 1989. http://dx.doi.org/10.21236/ada219876.

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Morris, Marlene C., Howard F. McMurdie, Eloise H. Evans, et al. Standard x-ray diffraction powder patterns :. National Bureau of Standards, 1985. http://dx.doi.org/10.6028/nbs.mono.25-21.

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Selig, W. S., G. S. Smith, K. K. Harding, and L. J. Summers. X-ray diffraction patterns of metal aurocyanides. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/5777169.

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Snyder, R. L., M. C. Nichols, and D. R. Boehme. The crystal structures and powder diffraction patterns of the uranium tellurides. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/6450206.

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Wang, Henry T. Approximate Calculation of Low Forward Speed Ship Radiation and Diffraction Wave Patterns. Defense Technical Information Center, 1988. http://dx.doi.org/10.21236/ada198998.

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Hubbard, C. R., B. Morosin, and J. M. Stewart. XRAYL: a program for producing idealized powder diffraction line profiles from overlapped powder patterns. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/453920.

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Oh, C. H., D. U. Choi, S. J. Park, et al. Diffraction patterns of the beam splitters used in a soft-x-ray interferometer with He-Ne laser. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/603643.

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Caritat, P. de, and U. Troitzsch. Towards a regolith mineralogy map of the Australian continent: a feasibility study in the Darling-Curnamona-Delamerian region. Geoscience Australia, 2021. http://dx.doi.org/10.11636/record.2021.035.

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Abstract:

Bulk quantitative mineralogy of regolith is a useful indicator of lithological precursor (protolith), degree of weathering, and soil properties affecting various potential landuse decisions. To date, no national-scale maps of regolith mineralogy are available in Australia. Catchment outlet sediments collected over 80% of the continent as part of the National Geochemical Survey of Australia (NGSA) afford a unique opportunity to rapidly and cost-effectively determine regolith mineralogy using the archived sample material. This report releases mineralogical data and metadata obtained as part of a feasibility study in a selected pilot area for such a national regolith mineralogy database and atlas. The area chosen for this study is within the Darling-Curnamona-Delamerian (DCD) region of southeastern Australia. The DCD region was selected as a ‘deep-dive’ data acquisition and analysis by the Exploration for the Future (2020-2024) federal government initiative managed at Geoscience Australia. One hundred NGSA sites from the DCD region were prepared for X-Ray Diffraction (XRD) analysis, which consisted of qualitative mineral identification of the bulk samples (i.e., ‘major’ minerals), qualitative clay mineral identification of the <2 µm grain-size fraction, and quantitative analysis of both ‘major’ and clay minerals of the bulk sample. The identified mineral phases were quartz, plagioclase, K-feldspar, calcite, dolomite, gypsum, halite, hematite, goethite, rutile, zeolite, amphibole, talc, kaolinite, illite (including muscovite and biotite), palygorskite (including interstratified illite-smectite and vermiculite), smectite (including interstratified illite-smectite), vermiculite, and chlorite. Poorly diffracting material (PDM) was also quantified and reported as ‘amorphous’. Mineral identification relied on the EVA® software, whilst quantification was performed using Siroquant®. Resulting mineral abundances are reported with a Chi-squared goodness-of-fit between the actual diffractogram and a modelled diffractogram for each sample, as well as an estimated standard error (esd) measurement of uncertainty for each mineral phase quantified. Sensitivity down to 0.1 wt% (weight percent) was achieved, with any mineral detection below that threshold reported as ‘trace’. Although detailed interpretation of the mineralogical data is outside the remit of the present data release, preliminary observations of mineral abundance patterns suggest a strong link to geology, including proximity to fresh bedrock, weathering during sediment transport, and robust relationships between mineralogy and geochemistry. The mineralogical data generated by this study are presented in Appendix A of this report and are downloadable as a .csv file. Mineral abundance or presence/absence maps are shown in Appendices B and C to document regional mineralogical patterns.

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Lacerda Silva, P., G. R. Chalmers, A. M. M. Bustin, and R. M. Bustin. Gas geochemistry and the origins of H2S in the Montney Formation. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329794.

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The geology of the Montney Formation and the geochemistry of its produced fluids, including nonhydrocarbon gases such as hydrogen sulfide were investigated for both Alberta and BC play areas. Key parameters for understanding a complex petroleum system like the Montney play include changes in thickness, depth of burial, mass balance calculations, timing and magnitudes of paleotemperature exposure, as well as kerogen concentration and types to determine the distribution of hydrocarbon composition, H2S concentrations and CO2 concentrations. Results show that there is first-, second- and third- order variations in the maturation patterns that impact the hydrocarbon composition. Isomer ratio calculations for butane and propane, in combination with excess methane estimation from produced fluids, are powerful tools to highlight effects of migration in the hydrocarbon distribution. The present-day distribution of hydrocarbons is a result of fluid mixing between hydrocarbons generated in-situ with shorter-chained hydrocarbons (i.e., methane) migrated from deeper, more mature areas proximal to the deformation front, along structural elements like the Fort St. John Graben, as well as through areas of lithology with higher permeability. The BC Montney play appears to have hydrocarbon composition that reflects a larger contribution from in-situ generation, while the Montney play in Alberta has a higher proportion of its hydrocarbon volumes from migrated hydrocarbons. Hydrogen sulphide is observed to be laterally discontinuous and found in discrete zones or pockets. The locations of higher concentrations of hydrogen sulphide do not align with the sulphate-rich facies of the Charlie Lake Formation but can be seen to underlie areas of higher sulphate ion concentrations in the formation water. There is some alignment between CO2 and H2S, particularly south of Dawson Creek; however, the cross-plot of CO2 and H2S illustrates some deviation away from any correlation and there must be other processes at play (i.e., decomposition of kerogen or carbonate dissolution). The sources of sulphur in the produced H2S were investigated through isotopic analyses coupled with scanning electron microscopy, energy dispersive spectroscopy, and mineralogy by X-ray diffraction. The Montney Formation in BC can contain small discrete amounts of sulphur in the form of anhydrite as shown by XRD and SEM-EDX results. Sulphur isotopic analyses indicate that the most likely source of sulphur is from Triassic rocks, in particular, the Charlie Lake Formation, due to its close proximity, its high concentration of anhydrite (18-42%), and the evidence that dissolved sulphate ions migrated within the groundwater in fractures and transported anhydrite into the Halfway Formation and into the Montney Formation. The isotopic signature shows the sulphur isotopic ratio of the anhydrite in the Montney Formation is in the same range as the sulphur within the H2S gas and is a lighter ratio than what is found in Devonian anhydrite and H2S gas. This integrated study contributes to a better understanding of the hydrocarbon system for enhancing the efficiency of and optimizing the planning of drilling and production operations. Operators in BC should include mapping of the Charlie Lake evaporites and structural elements, three-dimensional seismic and sulphate ion concentrations in the connate water, when planning wells, in order to reduce the risk of encountering unexpected souring.

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X-ray diffraction patterns of clay from the following wells: Beli Unit #1, cuttings (1210' - 2680') and core (9105 - 11665); and E de K Leffingwell, cuttings (2440' - 13660'). Alaska Division of Geological & Geophysical Surveys, 1992. http://dx.doi.org/10.14509/19035.

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