Temat: 61.10.Nz - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Soft X-Ray Diffraction up to Wavelengths of 6.0Å Becomes Feasible at ID1 of ESRF
Autorzy:: Carpentier, P.
Boesecke, P.
Bois, J.-M.
Chesne, M.-L.
Fanchon, E.
Kahn, R.
Stuhrmann, H.
Vicat, J.
Tematy:: 61.10.Nz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2030554.pdf Link otwiera się w nowym oknie
Opis:: Recent experiments carried out at the Anomalous Scattering Beamline ID1 of ESRF are described which show that a cold helium atmosphere provides optimal conditions for protein crystallography with soft X-rays at wavelengths up to 6Å. Image plates are suitable detectors for this wavelength range. The improvement with respect to earlier experiments is considerable. This observation opens the way to the use of anomalous dispersion at the K-edge of light elements, like phosphorus, sulphur, chlorine and calcium. Moreover, there is an interest to use the strong anomalous dispersion of some heavy elements such as uranium (110 anomalous electron units at its M_V edge) to solve large biological structures. The methods of multiwavelength anomalous diffraction and diffraction anomalous fine structure find new resonant labels which are wide spread in living matter and materials.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Cryocrystallography of Biological Macromolecules
Autorzy:: Schneider, Th. R.
Tematy:: 61.10.Nz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1963363.pdf Link otwiera się w nowym oknie
Opis:: X-ray diffraction experiments on crystals of biological macromolecules, especially when carried out on highly intense synchrotron beam lines, frequently suffer from radiation damage. Performing such experiments at cryogenic temperatures virtually eliminates radiation damage thus producing higher quality diffraction data and often making previously intractable problems feasible. In the following article the most important experimental aspects of low temperature diffraction experiments on macromolecular crystals will be discussed.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 3.

Tytuł:: Automatic System for Crystallographic Data Collection and Analysis
Autorzy:: Minor, W.
Cymborowski, M.
Otwinowski, Z.
Tematy:: 61.10.Nz
87.15.Aa; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2030557.pdf Link otwiera się w nowym oknie
Opis:: During the last 10 years the rate of new protein structures determined by X-ray crystallography has risen about tenfold. The use of high flux sources was instrumental in this growth. There are numerous advantages of using synchrotron radiation for protein crystallography: rapid data collection, use of micro-crystals and the ability to conduct measurements at wide range of wavelengths. The rate-limiting step is often the ability to analyze and back up a fast stream of data produced by a multi-module CCD detector. The goal of the newly developed HKL-2000 package is to integrate all computational activities that have to be performed during the data collection experiment. The Graphical Command Center of HKL-2000 organizes and forwards the data collection parameters to the display, indexing, strategy, simulation, refinement, integration, scaling, and merging tasks. Data acquisition can become a part of data processing (or vice versa), which includes indexing, integration, scaling, and even phasing. The increase in internet band width will provide an opportunity to remotely interact with the experimental setup and perform the synchrotron experiment from the home laboratory.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 4.

Tytuł:: Synthesis of Highly Porous SrTiO₃ Materials
Autorzy:: Mizera, A.
Drożdż, E.
Łańcucki, Ł.
Tematy:: 81.20.-n
61.10.Nz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1030919.pdf Link otwiera się w nowym oknie
Opis:: Strontium titanate is a perovskite with a great potential to act as an anode material for solid oxide fuel cells. The requirements for these materials concern not only electrical but also microstructural properties. The strontium titanate with regular pore structure can exhibit lower flow resistance compared to random pore distributed materials. Several methods of synthesis (with addition of various organic agents) allowed obtaining materials with regular/irregular pore structure. Regardless of synthesis methods all materials showed high porosity (above 40 vol.%). Additionally it was found that three-dimensionally ordered macroporous structure collapsed after sintering at 1200°C whereas macro-mesoporous structure of P-123 modified strontium titanate had persisted.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 5.

Tytuł:: Magnetisation and hydrogenation of Mg/Ni multilayers
Autorzy:: Pacanowski, S.
Marczyńska, A.
Dawczak-Dębicki, H.
Jabłoński, B.
Szymański, B.
Smardz, L.
Tematy:: 75.70.Cn
61.10.Nz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1048263.pdf Link otwiera się w nowym oknie
Opis:: In this contribution we have studied magnetisation of Mg/Ni multilayers (MLs) to characterise the alloing effect near interfaces. The layered structure was characterised by standard X-ray diffraction. The MLs were deposited by UHV magnetron sputtering onto naturally oxidised Si(100) substrates. Results showed, that due to Mg-Ni alloy formation near interfaces the magnetizations of the MLs were strongly reduced. Effective "dead" Ni layer thickness was estimated as 1.2 nm at room temperature (RT). Furthermore, hydrogen absorption kinetics at a pressure of about 1000 mbar was studied at RT in Pd covered Mg/Ni MLs using four-point resistivity measurements. Results showed that the fastest initial rise in resistance in the first 9 s was observed for d_{Ni}=3.5 nm.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Optimization of Azimuthal Scan Procedure for Absolute Structure Determination
Autorzy:: Grochowski, J.
Serda, P.
Tematy:: 33.15.Bh
61.10.Nz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1964133.pdf Link otwiera się w nowym oknie
Opis:: The paper describes the application of the azimuthal scan technique for absolute structure determination using X-ray anomalous dispersion. A diffraction pattern with rotation around the scattering vector provides information about various anisotropic effects: absorption, extinction and multi-beam interaction. Recording of azimuthal scans for Friedel pairs is proposed as an alternative to single reflection measurement. Several factors affecting the smoothness of the azimuthal scan curves are discussed and a procedure for eliminating various sources of errors, involving a Fourier filtering, is proposed in order to increase feasibility of chiral discrimination.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 7.

Tytuł:: Structure of CaPs coatings electrophoretically deposited on NiTi shape memory alloy
Autorzy:: Dudek, K.
Goryczka, T.
Tematy:: 87.15.Tt
87.68.+z
61.10.Nz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1111853.pdf Link otwiera się w nowym oknie
Opis:: The surface of NiTi shape memory alloys applied as long-term implants has been modified by protective calcium phosphates (CaPs) coatings, with the objective of improving the biocompatibility of this material. The calcium phosphates such as hydroxyapatite Ca₅(PO₃)OH (HAP) and β-tricalcium phosphate β-Ca₃(PO₄)₂ (β-TCP) were deposited by electrophoretic deposition. In order to improve the adhesion, the deposited samples were vacuum-sintered at wide range of temperature from 500°C to 1000°C for 2 h. The studies revealed that applied sintering conditions did not change the structure of CaPs. The coatings consisted of HAP with hexagonal structure (P63/m) and β-TCP with rhombohedral structure (R-3c). Changes in lattice parameters for CaPs coatings after deposition and sintering were refined by the Rietveld method.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 8.

Tytuł:: Structural Studies of Titanium Oxide Multilayers
Autorzy:: Karwasz, G. P.
Miotello, A.
Zomer, E.
Brusa, R. S.
Kościelska, B.
Armellini, C.
Kuzmin, A.
Tematy:: 82.47.Jk
78.70.Bj
61.10.Nz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2043379.pdf Link otwiera się w nowym oknie
Opis:: Multilayers of titanium oxide on conductive glasses (silica, covered with indium/tin and tin oxides) were obtained by different methods (from suspension, by sol-gel, by vacuum sputtering). X-ray diffraction and positron annihilation depth-resolved characterization of these samples are presented. The data allow us to determine optimal deposition parameters, in order to obtain the anatase phase, important in practical applications in photoelectrochemical cells.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Absolute Structure Determination in Absence of Heavy Scatterers
Autorzy:: Grochowski, J.
Tematy:: 61.10.Yh
33.15.Bh
61.10.Nz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1963368.pdf Link otwiera się w nowym oknie
Opis:: Methods of absolute structure determination for molecules containing only light atoms (C, H, N, O) are discussed in the paper. This experimentally difficult problem has a direct application in the structure determination of naturally originated compounds and modern chiral drugs. Several experimental methods of absolute structure determination like electron diffraction, multiple X-ray diffraction and X-ray anomalous scattering techniques are briefly discussed and compared. An application of dedicated azimuthal scan method for the case of hexamethylenetetramine is given as an illustration of this technique.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 10.

Tytuł:: Dendrite growth in selector-root area of single crystal CMSX-4 turbine blades
Autorzy:: Bogdanowicz, W.
Tondos, A.
Krawczyk, J.
Albrecht, R.
Sieniawski, J.
Tematy:: 61.66.Dk
61.72.-y
61.10.Nz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1058103.pdf Link otwiera się w nowym oknie
Opis:: The single crystal turbine blades made of CMSX-4 nickel-based superalloy were studied. The turbine blades were obtained by the Bridgman technique with withdrawal rate of 5 mm/min. The samples, cut-off from root part of blades and containing the fragment of the selector, were studied. The effect of selector geometry on the dendrites growth and defects formation in the selector-root area of the blade were analyzed. The Laue diffraction, scanning electron microscopy, and X-ray diffraction topography were applied. It was found that, during crystallization of the selector, the dendrite cores, after reaching the surface of mould, may bend, if the angle between dendrite cores and the mould surface was equal to 12°. When the angle was equal to 24° the growth of dendrites has been stopped. It can be stated that the defects, which appeared in the selector were inherited by the root part.
Dostawca treści:: Biblioteka Nauki

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