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  • 1
    Electronic Resource
    Electronic Resource
    Complex zeolite structure solved by combining powder diffraction and electron microscopy (2006)
    [s.l.] : Nature Publishing Group
    Nature 444 (2006), S. 79-81 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Many industrially important materials, ranging from ceramics to catalysts to pharmaceuticals, are polycrystalline and cannot be grown as single crystals. This means that non-conventional methods of structure analysis must be applied to obtain the structural information that is fundamental to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature05200
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  • 2
    Electronic Resource
    Electronic Resource
    Ordered nanoporous arrays of carbon supporting high dispersions of platinum nanoparticles (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 412 (2001), S. 169-172 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nanostructured carbon materials are potentially of great technological interest for the development of electronic, catalytic and hydrogen-storage systems. Here we describe a general strategy for the synthesis of highly ordered, rigid arrays of nanoporous carbon having uniform but tunable ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35084046
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of chiral mesoporous silica (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 429 (2004), S. 281-284 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Chirality is widely expressed in organic materials, perhaps most notably in biological molecules such as DNA, and in proteins, owing to the homochirality of their components (d-sugars and l-amino acids). But the occurrence of large-scale chiral pores in inorganic materials is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02529
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  • 4
    Electronic Resource
    Electronic Resource
    Modeling Scatter in Multiple Energy Windows to Incorporate Scattered Radiation Information in Single Photon Emission Computed Tomography Imaging (1999)
    Springer
    Optical review 6 (1999), S. 49-56 
    Details
    ISSN: 1349-9432
    Keywords: SPECT imaging ; Compton scatter ; multiple energy windows ; Poisson noise ; GARDS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using scattered radiation as useful information to improve radioisotope image quality is a topic attracting many researchers. Some reports showed that incorporating scattered components offers a possibility to improve image quality. The general method is modeling scatter in multiple energy windows and incorporating that information into the reconstruction process. However, what the performance will be and how noise will behave when using scattered radiation in reconstruction are not yet well answered. In this paper, we investigate a method of modeling scatter in multiple energy windows in cases of a few projection views. The system performance is analyzed using singular value decomposition and resolution kernels. For noise behavior investigation, reconstructions are accomplished by estimating the variance of reconstructed voxel values and the effectiveness of using scatter is evaluated by resolution kernel analysis. The results show there are improvements in normalized mean-square error of the images and the resolution kernels. When photon counts fall below about one million, it is still effective to use scatter for some cases of a few projections
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-999-0049-9
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  • 5
    Electronic Resource
    Electronic Resource
    Fast Estimation of Scatter Components Using the Ordered Subset Expectation Maximization Algorithm for Scatter Compensation (1999)
    Springer
    Optical review 6 (1999), S. 415-423 
    Details
    ISSN: 1349-9432
    Keywords: FESC method ; scatter estimation ; scatter compensation ; OS-EM algorithm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this work we propose a method for scatter compensation in single photon emission computed tomography imaging, by which we can estimate the scatter components in projections in high speed with good accuracy. The method is that we first estimate the scatter components in projections based on scatter response kernels by one time of ordered subsets expectation maximization iterative reconstruction, and then subtract the estimated scatter components from the projections and complete reconstruction by filtered back-projection method. The principle is that the image corresponding to the scatter components in projections consists largely of low-frequency components of an activity distribution; these low-frequency components will converge faster than the high ones in iterative reconstruction. Therefore, we can estimate the low-frequency component image before the image converges with the high-frequency ones, and obtain the scatter components by re-projecting the low-frequency component image with scatter response kernels. The effects of the proposed method were compared with the dual- and triple-energy window methods using experimental measurements. The results show that good accuracy in estimated scatter components, good uniformity of scatter compensation at the center and the side of an object, and good noise property can be acquired by this method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-999-0415-7
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  • 6
    Electronic Resource
    Electronic Resource
    Infrared Transmission Performance of Gallium Phosphide Thin Films Deposited by RF Magnetron Sputtering (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 3685-3688 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Long-wave infrared windows and domes used under harsh conditions always suffer sand abrasion and raindrop erosion. GaP thin film has proved to be effective LWIR protective coating for zinc sulphide window. In this article, the GaP films have been deposited on 5-mm-thick thermo-pressed planar ZnS substrates by RF magnetron sputtering in high pure Ar gas, with a single crystalline GaP disc as the target. The maxima of the GaP/ZnS transmission spectra curve are less than the corresponding transmissivities of ZnS substrates, which indicates that the GaP films are of absorption. SEM results show that the films are very compact and their surfaces are glazed. XPS analysis shows that gallium content is more than phosphor content in the films, and oxygen is the main impurity. The more the gallium content is, the more absorption the film is of. The absorption does not vary greatly with oxygen content. So the absorption of the film is caused mainly by theoverfull metal component, which increases the conductivity and causes the charge carrier absorption. Low absorption GaP film with the thickness more than 10 µm has been deposited, in which the Ga:P ratio is nearly 1:1
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.3685.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    The Effect of Heat Treatment on the Properties of LF9 Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 442-445 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The paper experimentally investigated the change of LF9 properties, including strength atroom temperature and 350ºC, plasticity and impact toughness, under various heat treatmentschedules. Results show that the strength of LF9 decreases and plasticity and toughness increaseafter secondary aging, with the increase of solid solution temperature. Meanwhile, with the increaseof aging time, the strength of LF9 increase and plasticity and toughness decrease. The investigationof optical metallography, TEM and phase analysis indicate that the phenomena are mainly causedby the precipitation of η, γ’and γ’’
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.442.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    An Impact-Abrasion Resistant Surfacing Electrode and its Wear-Resistant Mechanism (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 373-374 (Mar. 2008), p. 547-550 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Aiming at improving the impact wear-resistant performance of metals, a new sort ofsurfacing electrode named TKCE50 was developed in this paper. This electrode is a Fe-Mn-Cr-Mo-Valloy system and belongs to iron-base wear-resistant materials. Tests like hardness, wear loss andimpact-abrasion test were performed on the samples surfaced with the electrode. The results indicatedthat TKCE50 had not only good welding technological properties, but also super work-hardeningeffect and perfect impact wear-resistance. In addition, the work-hardening and wear-resistantmechanisms for this electrode were discussed based on corresponding experimental investigation andtheoretical analysis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.547.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of Shape and Distribution of M〈sub〉7〈/sub〉C〈sub〉3〈/sub〉 on Wear Resistance of Iron Based Composite (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 373-374 (Mar. 2008), p. 560-563 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Effects of shape and distribution of the hard phases (Fe, Cr)7C3 and Cr7C3 on wearresistance of Fe5 deposited metal obtained by plasma arc welding with electromagnetic stirring wereinvestigated. The deposited layers were subsequently characterized by SEM observation, wear testsand hardness measurements. The hardness of the deposited layers was increased and then decreasedwith increasing the applied current. With the current of 3 A and the electromagnetic frequency of 10Hz, the hardness of deposited metal reached maximum value of about HRC 68, which was increasedabout 19% compared with that of the deposited metal without electromagnetic stirring. The wearweight loss of the deposited metal with 3 A and 10 Hz is greatly decreased. It is confirmed that theshape and the distribution of hard phase significantly affect wear resistance of the deposited metal.The slag M7C3 is transformed into hexagon during electromagnetic stirring with 3 A and 10 Hz. Andthe regular distribution of hexagon M7C3 in the deposited metal resulted in the excellent wearresistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.560.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Deposition and Properties Studies of Superfine TiN Films with Magnetic Filter (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 61-64 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Arc ion plating(AIP) has higher deposition rates, whereas macro-particles (MPs) makethe film properties decreasing. In this paper, AIP with or without magnetic filter (MF or AIP) andcomposition of AIP followed with magnetic filter (MFAIP) were designed to deposit TiN films onsilicon (Si) and high-speed steel(HSS), respectively. Scanning electron microscope (SEM),nanoindentation and microscratch tests were investigated. SEM showed that both the MF and theMFAIP films had a superfine layer among the columnar crystals grown vertically against substratesurface. However, the columnar crystals of MF films were leptosomatic and well-orientational,while MFAIP ones were coarse and short, and even ragged in size and orientation. Nanoindentationtest results showed the highest hardness for MF films and the lowest one for AIP films. A newparameter Scratch Crack Propagation Resistance (CPRs) was introduced to evaluate the filmadhesion properties in a scratch test. MF films had the highest adhesion. AIP films were mostsusceptible to failure as the CPRs was the lowest, although the Lc1 was higher than MFAIP ones. Itwas proposed that the MPs were effectively removed with the MF, and the MF layers weresuperfine to improve the properties of the films
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.61.pdf
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