ElaStic: A universal tool for calculating elastic constants from first
... Preprint submitted to Computer Physics Communications ...
... Preprint submitted to Computer Physics Communications ...
titanium
... this time Kroll prepared titanium commercially by reducing titanium tetrachloride with magnesium. The Kroll Process, as it became known, is still used to commercially produce titanium today. Firstly the titanium containing mineral (either ilmenite or rutile) is treated to produce titanium tetrachlor ...
... this time Kroll prepared titanium commercially by reducing titanium tetrachloride with magnesium. The Kroll Process, as it became known, is still used to commercially produce titanium today. Firstly the titanium containing mineral (either ilmenite or rutile) is treated to produce titanium tetrachlor ...
load resonant measurements of quartz crystals
... The measured parameters are not as accurate with this method as those measured without a physical capacitor because of the required mathematical transformations. In addition any variation in the stray CY term will result in a measurement error. The "Physical Capacitor" also requires the standard PI ...
... The measured parameters are not as accurate with this method as those measured without a physical capacitor because of the required mathematical transformations. In addition any variation in the stray CY term will result in a measurement error. The "Physical Capacitor" also requires the standard PI ...
Light-absorption effect on Bragg interference in multilayer semiconductor heterostructures
... of k A . One can see that this dependence always has a saturating character while the saturation value of the reflection coefficient R ` drastically depends on absorption. It is worth noting from Fig. 4 that the Bragg mirror containing 10 periods of a superlattice has roughly the same peak value of ...
... of k A . One can see that this dependence always has a saturating character while the saturation value of the reflection coefficient R ` drastically depends on absorption. It is worth noting from Fig. 4 that the Bragg mirror containing 10 periods of a superlattice has roughly the same peak value of ...
Aalborg Universitet Spontaneous emission in two-dimensional photonic crystal microcavities Søndergaard, Thomas
... of states by weighting the contribution from each electromagnetic state by the position-dependent amplitude of the electric field squared. With this modification, spontaneous emission can be simply related to the now position-dependent photon density of states. Previous theoretical calculations of t ...
... of states by weighting the contribution from each electromagnetic state by the position-dependent amplitude of the electric field squared. With this modification, spontaneous emission can be simply related to the now position-dependent photon density of states. Previous theoretical calculations of t ...
Textures in komatiites and variolitic basalts.
... line or point. Each fibre has a crystallographic orientation slightly different to that of its neighbour; hence their “Maltese cross” extinction pattern when viewed under cross-nicols of the petrographic microscope. Undoubtedly the term spherulite is poor because spherulites need not be spherical (F ...
... line or point. Each fibre has a crystallographic orientation slightly different to that of its neighbour; hence their “Maltese cross” extinction pattern when viewed under cross-nicols of the petrographic microscope. Undoubtedly the term spherulite is poor because spherulites need not be spherical (F ...
A BASIC INTRODUCTION - Redstone Exploration Services
... mineral that breaks into sheets has one dominant cleavage, one which breaks into splinters or prisms has two cleavage directions, whereas one that breaks into cubes or rhombs has three cleavages or more. Cleavage is said to be ‘basal’ when it occurs perpendicular to the c axis of the ...
... mineral that breaks into sheets has one dominant cleavage, one which breaks into splinters or prisms has two cleavage directions, whereas one that breaks into cubes or rhombs has three cleavages or more. Cleavage is said to be ‘basal’ when it occurs perpendicular to the c axis of the ...
Minerals - Round 2 - Yonkers Public Schools
... the two tables below and on your knowledge of Earth science. Table 1 shows the composition, hardness, and average density of four minerals often used as gemstones. Table 2 lists the minerals in Moh's Scale of Hardness from 1 (softest) to 10 (hardest). ...
... the two tables below and on your knowledge of Earth science. Table 1 shows the composition, hardness, and average density of four minerals often used as gemstones. Table 2 lists the minerals in Moh's Scale of Hardness from 1 (softest) to 10 (hardest). ...
PPT - Physikalisches Institut Heidelberg
... to those usually related to XFELs. Even of not less importance is the unique feature of RCE as a tunable source of polarized X-ray radiation. True, RCE will never compete with lasers in whole. But the wide experience gained in experimental and theoretical RCE studies, especially concerning polarizat ...
... to those usually related to XFELs. Even of not less importance is the unique feature of RCE as a tunable source of polarized X-ray radiation. True, RCE will never compete with lasers in whole. But the wide experience gained in experimental and theoretical RCE studies, especially concerning polarizat ...
Nanoporous molecular crystals - ORCA
... guests within one-dimensional channels of 6 A (Fig. 3).118,119 Removal of the included guest from the pseudohexagonal crystals (space group ¼ P63/m) can result in the formation of a dense monoclinic crystal or, by careful treatment of the benzene-containing inclusion compound under vacuum, an unsolv ...
... guests within one-dimensional channels of 6 A (Fig. 3).118,119 Removal of the included guest from the pseudohexagonal crystals (space group ¼ P63/m) can result in the formation of a dense monoclinic crystal or, by careful treatment of the benzene-containing inclusion compound under vacuum, an unsolv ...
PDF file - Berkeley Global Science Institute
... points of extension (in this example, carboxylate C atoms) defining geometrical shapes referred to as secondary building units (SBUs)26. The successful design of rigid frameworks based on such SBUs was demonstrated for the first time in MOF-2 (see ref. 43 and below) and MOF-544. The design principle ...
... points of extension (in this example, carboxylate C atoms) defining geometrical shapes referred to as secondary building units (SBUs)26. The successful design of rigid frameworks based on such SBUs was demonstrated for the first time in MOF-2 (see ref. 43 and below) and MOF-544. The design principle ...
Full-Text PDF
... limitations and extensions, which often are overlooked. 2. Dependence on the Binding Mechanism/Medium, pH and Stereoelectronic Effects First of all, there are fundamental differences in the function of the lock-and-key principle in the gas state and in solution; the situation in crystals is again qu ...
... limitations and extensions, which often are overlooked. 2. Dependence on the Binding Mechanism/Medium, pH and Stereoelectronic Effects First of all, there are fundamental differences in the function of the lock-and-key principle in the gas state and in solution; the situation in crystals is again qu ...
Building Materials by Packing Spheres
... Monodisperse colloidal particles are natural building blocks for composite materials with micrometer-scale features, but these particles have one inherent limitation: they are nearly always spheres. Because a colloidal particle is much larger than its constituent atoms, its shape is determined by su ...
... Monodisperse colloidal particles are natural building blocks for composite materials with micrometer-scale features, but these particles have one inherent limitation: they are nearly always spheres. Because a colloidal particle is much larger than its constituent atoms, its shape is determined by su ...
Crystal Structure of Schizosaccharomyces pombe Riboflavin Kinase
... to the substrate-binding platform where it contributes to the riboflavin-binding site. The crystallographic model of S. pombe riboflavin kinase comprises residues 10 to 82 and 94 to 162, which fold into six b-strands, four a-helices and the connecting loops. The six b-strands are highly twisted to f ...
... to the substrate-binding platform where it contributes to the riboflavin-binding site. The crystallographic model of S. pombe riboflavin kinase comprises residues 10 to 82 and 94 to 162, which fold into six b-strands, four a-helices and the connecting loops. The six b-strands are highly twisted to f ...
IOSR Journal of Applied Physics (IOSR-JAP)
... T. Prasanyaa and M. Haris, Growth and characterization of semiorganic NLO L-arginine trifluoroacetate (LATF) added KDP single crystals, Archives of Physics Research, 2 (4), 2011, 60-66. M. Iyanar, J. Thomas Joseph Prakash , C. Muthamizhchelvan and S. Ponnusamy, Synthesis, Growth, and Characterizatio ...
... T. Prasanyaa and M. Haris, Growth and characterization of semiorganic NLO L-arginine trifluoroacetate (LATF) added KDP single crystals, Archives of Physics Research, 2 (4), 2011, 60-66. M. Iyanar, J. Thomas Joseph Prakash , C. Muthamizhchelvan and S. Ponnusamy, Synthesis, Growth, and Characterizatio ...
In situ transmission electron microscopy of stress
... B19 . Note that there is no indication of the occurrence of the Rphase. A series of diffraction patterns during straining is shown in Fig. 2, and allows to determine the orientation relationship between austenite and martensite which is in this case [1, −1, 0]B19 //[1, 1, −1]B2 with an angle of 4. ...
... B19 . Note that there is no indication of the occurrence of the Rphase. A series of diffraction patterns during straining is shown in Fig. 2, and allows to determine the orientation relationship between austenite and martensite which is in this case [1, −1, 0]B19 //[1, 1, −1]B2 with an angle of 4. ...
Stannides and Intermetallic Tin Compounds
... data. Also the defect clathrate Cs 8 Sn44 has been reported [50]. These clathrate phases are promising candidates for thermoelectric materials [51 – 53]. The systems with potassium, rubidium, and cesium have not so intensively been investigated as the sodium–tin system. Some of the structures have s ...
... data. Also the defect clathrate Cs 8 Sn44 has been reported [50]. These clathrate phases are promising candidates for thermoelectric materials [51 – 53]. The systems with potassium, rubidium, and cesium have not so intensively been investigated as the sodium–tin system. Some of the structures have s ...
atomic and molecular physics using positron traps
... Positron-matter interactions are important in areas of atomic physics, condensed matter physics and gamma-ray astronomy, and for technological applications including mass spectroscopy and characterization of solid surfaces [1-4]. Study of the interaction of positrons with atoms and molecules has a l ...
... Positron-matter interactions are important in areas of atomic physics, condensed matter physics and gamma-ray astronomy, and for technological applications including mass spectroscopy and characterization of solid surfaces [1-4]. Study of the interaction of positrons with atoms and molecules has a l ...
RSC_CC_C0CC04271D 1..3 - E-Prints Complutense
... the growth of the major population in the solid phase.22,23 ** In conclusion we have reported that the amino acid valine, racemic compound, is converted via sublimation into a conglomerate (note that no ee is needed for this). On continued heating the condensed crystals from sublimation undergo a su ...
... the growth of the major population in the solid phase.22,23 ** In conclusion we have reported that the amino acid valine, racemic compound, is converted via sublimation into a conglomerate (note that no ee is needed for this). On continued heating the condensed crystals from sublimation undergo a su ...
Introduction to Neutron Scattering
... The scattering of neutrons by nuclei is a quantum mechanical process. Formally, the process has to be described in terms of the wavefunctions of the neutron and the nucleus. Fortunately the results of this calculation can be understood without going into all of the details involved. It is useful, th ...
... The scattering of neutrons by nuclei is a quantum mechanical process. Formally, the process has to be described in terms of the wavefunctions of the neutron and the nucleus. Fortunately the results of this calculation can be understood without going into all of the details involved. It is useful, th ...
Minerals - UNLV Geoscience
... stronger than ionic bonds • Both ionic and covalent bonds typically occur in the same compound (bonds are seldom 100% ionic or covalent in character) ...
... stronger than ionic bonds • Both ionic and covalent bonds typically occur in the same compound (bonds are seldom 100% ionic or covalent in character) ...
The three-dimensional structure of a photosystem II core complex
... six of these subunits have similar structures [8]. In contrast and despite its importance, the structure of the PSII core is far less understood. To date, only small three-dimensional (3-D) crystals of the PSII core have been obtained, and these diffract X-rays too weakly to yield useful structural ...
... six of these subunits have similar structures [8]. In contrast and despite its importance, the structure of the PSII core is far less understood. To date, only small three-dimensional (3-D) crystals of the PSII core have been obtained, and these diffract X-rays too weakly to yield useful structural ...
Mineral
... oxygen, and that may also contain one or more metals Common silicate minerals include quartz, feldspars, micas ,and ferromagnesian minerals, such as amphiboles, pyroxenes, and olivines. Silicate minerals make up 96% of Earth’s crust. Quartz and feldspar alone make up more than 50% of the crust. ...
... oxygen, and that may also contain one or more metals Common silicate minerals include quartz, feldspars, micas ,and ferromagnesian minerals, such as amphiboles, pyroxenes, and olivines. Silicate minerals make up 96% of Earth’s crust. Quartz and feldspar alone make up more than 50% of the crust. ...
Keeping the Ball Rolling: Fullerene
... pentagons and 20 hexagons arranged into a truncated icosahedron, the same configuration as seen on a soccer ball (Figure 1). It is also known as buckminsterfullerene, or just fullerene for short, due to its resemblance to the geodesic dome designed by visionary architect Buckminster Fuller. Consider ...
... pentagons and 20 hexagons arranged into a truncated icosahedron, the same configuration as seen on a soccer ball (Figure 1). It is also known as buckminsterfullerene, or just fullerene for short, due to its resemblance to the geodesic dome designed by visionary architect Buckminster Fuller. Consider ...
- Mendeley Data
... surrounded by N2O2 coordination environment. In this work, in order to investigate the catalytic activity of oxovanadium Schiff base complex as catalyst, we synthesized a new asymmetrical tetradentate Schiff base ligand and it’s metal complex Scheme 1 characterized by FT-IR, 1H NMR and UV-Vis spectr ...
... surrounded by N2O2 coordination environment. In this work, in order to investigate the catalytic activity of oxovanadium Schiff base complex as catalyst, we synthesized a new asymmetrical tetradentate Schiff base ligand and it’s metal complex Scheme 1 characterized by FT-IR, 1H NMR and UV-Vis spectr ...
X-ray crystallography
X-ray crystallography is a tool used for identifying the atomic and molecular structure of a crystal, in which the crystalline atoms cause a beam of incident X-rays to diffract into many specific directions. By measuring the angles and intensities of these diffracted beams, a crystallographer can produce a three-dimensional picture of the density of electrons within the crystal. From this electron density, the mean positions of the atoms in the crystal can be determined, as well as their chemical bonds, their disorder and various other information.Since many materials can form crystals—such as salts, metals, minerals, semiconductors, as well as various inorganic, organic and biological molecules—X-ray crystallography has been fundamental in the development of many scientific fields. In its first decades of use, this method determined the size of atoms, the lengths and types of chemical bonds, and the atomic-scale differences among various materials, especially minerals and alloys. The method also revealed the structure and function of many biological molecules, including vitamins, drugs, proteins and nucleic acids such as DNA. X-ray crystallography is still the chief method for characterizing the atomic structure of new materials and in discerning materials that appear similar by other experiments. X-ray crystal structures can also account for unusual electronic or elastic properties of a material, shed light on chemical interactions and processes, or serve as the basis for designing pharmaceuticals against diseases.In a single-crystal X-ray diffraction measurement, a crystal is mounted on a goniometer. The goniometer is used to position the crystal at selected orientations. The crystal is bombarded with a finely focused monochromatic beam of X-rays, producing a diffraction pattern of regularly spaced spots known as reflections. The two-dimensional images taken at different rotations are converted into a three-dimensional model of the density of electrons within the crystal using the mathematical method of Fourier transforms, combined with chemical data known for the sample. Poor resolution (fuzziness) or even errors may result if the crystals are too small, or not uniform enough in their internal makeup.X-ray crystallography is related to several other methods for determining atomic structures. Similar diffraction patterns can be produced by scattering electrons or neutrons, which are likewise interpreted by Fourier transformation. If single crystals of sufficient size cannot be obtained, various other X-ray methods can be applied to obtain less detailed information; such methods include fiber diffraction, powder diffraction and (if the sample is not crystallized) small-angle X-ray scattering (SAXS).If the material under investigation is only available in the form of nanocrystalline powders or suffers from poor crystallinity, the methods of electron crystallography can be applied for determining the atomic structure.For all above mentioned X-ray diffraction methods, the scattering is elastic; the scattered X-rays have the same wavelength as the incoming X-ray. By contrast, inelastic X-ray scattering methods are useful in studying excitations of the sample, rather than the distribution of its atoms.