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  • 1
    Electronic Resource
    Electronic Resource
    Microstructure and Properties of Zn〈sub〉61〈/sub〉Al〈sub〉34〈/sub〉M〈sub〉5〈/sub〉 Alloy Produced by Rapid Solidification and Warm-Compacting Sintering Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 829-832 
    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: Microstructure and mechanical properties of a newly developed Zn61Al34M5 (M=Cu, Si,RE, et al.) alloy obtained by warm-compacting sintering technique were studied using opticalmicroscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy(EDS), X-ray diffraction (XRD) and differential scanning calorimetry (DSC) associated withmeasurements of mechanical properties. The results showed that the new alloy consisted of α-phaseand η-phase and have good plasticity; its hardness increased by 10%~20% and density decreased byabout 16% as compared with those of the traditional cast Zn-Al alloys
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.829.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Research on the 5-axis Machining of Blisk (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 612-615 
    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: The study presents a new method for 5-axis machining of blisk, which consists of bothroughing tunnels and finishing blades. The ruled surface is used to approximate the freeformsurface of blade, and the boundary contour of the tunnel is then determined. Based on the doublepoint offset method, the 5-axis tool paths for roughing blisk tunnel region are generated. Similarly,by linking the corresponding points on the tool center curves and the tool axis drive curves, thespiral tool paths are developed to finish milling thin-walled blades taking into account the residualstresses induced part distortion during machining. This strategy is experimentally verified
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.612.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    A Novel Hydroxyapatite Carrier for Enrichment of Hydrocarbon Degradation Bacteria (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1914-1917 
    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: In this paper, a novel and highly efficient hydroxyapatite (HA) carrier for cultivatinghydrocarbon degradation bacteria (HDB) is introduced. The HA particles synthesized through a sol-gelmethod and different heat treatments were characterized by X-ray diffraction (XRD), scanning electronmicroscopy (SEM) and BET method. The microbial amount and activities of HDB cultivated on HAcarriers were quantitatively investigated in order to assess their enriching capabilities. The results showedthat HA synthesized at 550°C and the one without calcination could enrich HDB 3 and 2 magnitudeorders more than the activated carbon, respectively. Mechanisms of bacterial enrichment on HA andactivated carbon were also studied, and it is believed that the high bioactivity and the surface morphologyof HA were responsible for the efficient reproduction of HDB. It is concluded that HA is a potentialcandidate to replace the conventionally used activated carbon as a novel carrier applied in the filed ofbioremediation for oil contaminated soil
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1914.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Factors Affecting the Pore Size in Porous Hydroxyapatite Produced by Stir-Froth-Polymerization Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1571-1573 
    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: Stir-froth-polymerization is a novel technique for producing highly porous ceramics, in whichbubbles are formed by a mechanical frothing in aqueous slurry of ceramic powders. Many work had bedone about the porosity, the permeability and the mechanical strength of the porous ceramics derivedfrom this method, but there are still a lot of things remain unclear. This paper focuses on the mechanism offrothing, and the influence of parameters in the mechanical frothing. It was found that the stir time, the stirspeed and the viscosity of the slurry have influence on the average cell-size and the distribution of themrespectively. The average cell-size can be controlled in the range from 60 to 160 μm by adjusting theparameters
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1571.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Particle Size Control in Sol-Gel Synthesis of Nano Hydroxyapatite (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 231-234 
    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: Sol-gel method is one of the most potential techniques for mass-production of nanohydroxyapatite. In this paper, particle size control techniques, including dripping speed control,addition of several dispersants such as ammonium citrate, castor oil and silane coupling agent, aswell as usage of insoluble and water soluble starch additives, were investigated. The particle sizeand microstructures of as synthesized hydroxyapatite were studied by X-ray diffraction, Scanningelectron microscopy and dynamic light scattering. The results indicated that all the controltechniques had considerable effects on decreasing the crystallite size, and the starch additives alsoexhibited obvious effect on preventing the agglomeration of nano crystallites during thesynthesizing process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.231.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and polymerization of oligo(oxyethylene) macromonomer bearing sodium sulfonate (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 2313-2318 
    Details
    ISSN: 0887-624X
    Keywords: macromonomer ; oligo(oxyethylene) ; sulfonate ; etherification ; esterification ; single-ion conductor ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Oligo(oxyethylene) macromonomers bearing sodium sulfonate group have been synthesized through four reactions: (1) ring-opening polymerization of oxirane, (2) etherification of monomethoxyl oligo(oxyethylene) and epichlorohydrin, (3) sulfonation of cycloxyl compound, and (4) end-capping of sodium oligo(oxyethylene) sulfonate by methacrylic group. A desired length of oligo(oxyethylene) in the macromonomers can easily be achieved by controlling the ratio of reactants in the ring-opening step. The structures of the products of each reaction were identified by IR, 1H-NMR, and GPC. Polymers of the monomers were also characterized by GPC and DSC. © 1993 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310914
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  • 7
    Electronic Resource
    Electronic Resource
    Finite element analysis of creep fracture initiation in a model superalloy material (1996)
    Springer
    International journal of fracture 81 (1996), S. 299-320 
    Details
    ISSN: 1573-2673
    Keywords: finite element analysis ; crack-tip creep fields ; plane stress ; plane strain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Detailed finite element analyses were performed for a single edge-cracked specimen geometry under both plane stress and plane strain constraint for a superalloy material that obeys a power-law creep relationship. The objectives of these analyses were to elucidate the stationary creep crack-tip fields and to provide guidance for the experimental measurement of crack-tip deformations. New results demonstrate that, for both plane stress and plane strain, the angular variations in the creep strain fields do not agree with HRR-type predictions, although the radial variations are in agreement with HRR-type creep strain field predictions in a zone very near the crack tip. Thus, the use of experimental measurement of surface displacement and/or strain data for the location of HRR-type fields may not be possible, unless modifications to the existing HRR-type theory are made. It is also noted that the size of the stress-based HRR-dominance zone is only a fraction of the creep zone size in plane stress, and is very small (especially along θ=0°) compared to the creep zone size in plane strain. Furthermore, the dominance of the singular strain fields are at least two orders of magnitude smaller than the corresponding stress dominance zones. As such, unless the microstructural features of the material are smaller than the dimensions of the dominance zones, the basis for using stress or strain-based fracture parameters derived from the HRR-type fields for prediction of creep fracture initiation is unclear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012425
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  • 8
    Electronic Resource
    Electronic Resource
    Electrical resistivity behavior of mold-cast metal-filled polymer composites (1994)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 34 (1994), S. 1109-1114 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Mold-cast, metal-filled composites made of poly(methyl methacrylate) and aluminum or nickel exhibited electrical resistance qualitative behavior as predicted by the percolation and tunneling mechanisms. A precipitous change in resistivity of about 104 ohm-cm was found at volume concentrations of filler in the range of 18.5 to 19.8 vol%. Details of the electrode system are given for making these measurements. Using different polymers does not change the resistance behaviour of the composite to any great degree, suggesting that particle features of shape, size, arrangement, and so forth are the more important parameters. Such particle morphological details are indicated in the included photomicrographs.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760341403
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  • 9
    Electronic Resource
    Electronic Resource
    Interaction of a diazoresin with sodium dodecyl sulfate in aqueous solution (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 19 (1998), S. 291-294 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The interaction between a diazoresin and sodium dodecyl sulfate (SDS) in aqueous solution was investigated. It was found that the diazoresin-SDS complex dissolves in water containing excessive SDS. The thermal stability and photo-sensitivity of the diazoresin-SDS complex was also studied. The results show that the complex possesses an increased thermal stability while preserving its high photo-sensitivity. An aqueous composition containing diazoresin and SDS was used directly to prepare a photosensitive coating.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 10
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    Unknown
    Mitigation of Ionospheric Effects on GNSS Positioning at Low Latitudes (2018)
    Details
    Publication Date: 2020-11-19
    Description: Ionospheric conditions at low latitudes are extremely harsh due to the frequent occurrence ofscintillation and the presence of strong TEC gradients. For this study, the São Paulo state region in Brazil is chosenas a test area. This study presents a strategy to mitigate the ionospheric impact on RTK positioning with anexperimental result. The proposed strategy explores two approaches that can be applied simultaneously: a) tomitigate the scintillation effect on the GNSS signals by refining the stochastic model of the correspondingobservations and b) to precisely estimate the residual double difference ionospheric delay by exploiting an accurateTEC map.The strategy was tested on a long baseline kinematic processing under strong scintillation conditions (DOY21 in2014). Significant improvements were observed when the combined use of the two mitigation approaches describedabove was compared with the use of conventional state-of-the-art approaches. Copyright # 2017 Institute ofNavigation
    Description: Published
    Description: 67-74
    Description: 2A. Fisica dell'alta atmosfera
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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