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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and Characterization of Nanocrystalline Lanthanide Oxysulfide via a La(OH)3 Gel Solvothermal Route (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A La(OH)3 gel solvothermal process has been developed for the preparation of nanocrystalline lanthanide oxysulfide (La2O2S) in polar solvents at 300°C through a reaction between a La(OH)3 gel and K2S. X-ray powder diffraction (XRD) indicated that the product was hexagonal La2O2S with cell parameters a= 4.046 Å and c= 6.951 Å. Transmission electronic microscopy (TEM) showed that different morphology nanocrystallites were formed, including particles with diameters of about 10 nm and nanorods about 10 nm in diameter and 300 nm in length, depending on the solvent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01603.x
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  • 2
    Electronic Resource
    Electronic Resource
    Coexistence of wurtzite GaN with zinc blende and rocksalt studied by x-ray power diffraction and high-resolution transmission electron microscopy (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 334-336 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray powder diffraction and high-resolution transmission electron microscopy (HRTEM) have found coexistence of three structures of GaN: wurtzite, zinc blende, and rocksalt in the samples prepared through benzene thermal process at 280–300 °C under pressure about 5 MPa. Previously, GaN with rocksalt structure only appeared at high pressure more than 37 GPa. HRTEM showed that there was a transitional region between the two cubic phases of GaN with zinc blende and rocksalt. X-ray photoelectron spectra analysis of the sample gave the average composition of Ga0.95N. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118051
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  • 3
    Electronic Resource
    Electronic Resource
    Microwave-power handling capability of HgBa2CaCu2O6+δ superconducting microstrip lines (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2417-2419 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurement of microwave-power handling capability, performed on high-temperature superconducting HgBa2CaCu2O6+δ (Hg-1212) microstrip lines, was carried out at a microwave frequency of 1 GHz and temperatures ranging from 77 to 120 K. These samples were prepared using a different route in which direct patterning on Hg-1212 was avoided to minimize their moisture exposure. Microwave input power was swept to high levels to drive the samples from a linear (less dissipative) state into nonlinear (more dissipative) state. Critical input power (Pc) was determined to be the crossover between the two states. The Pc values observed for Hg-1212 microstrip lines were 29.3, 25.8, 23, and 16 dBm at 80, 90, 100, and 110 K, respectively. These Pc values, comparable with the best obtained so far on other superconductors at lower temperatures, are orders of magnitude better at 100 K or higher, suggesting that Hg-1212 is promising for microwave devices and circuits operating above 100 K or higher temperatures. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1409950
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of Uniform Titanium Nitride Nanocrystalline Powders via a Reduction–Hydrogenation–Dehydrogenation–Nitridation Route (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A novel reaction of TiCl4 and NaNH2 at 450°–500°C for 12–24 h was performed for the preparation of TiN nanocrystalline powders. Powder XRD patterns indicated that the as-synthesized powder was cubic-phase TiN with a lattice constant a=4.225 Å. Transmission electron microscopy images showed that the TiN powders consisted of uniform particles with an average diameter of 10–20 nm. The binding energies of Ti2p3/2 and N1s core levels at the position of 455.50 and 396.96 eV, respectively, were detected by X-ray photoelectron spectra. Four peaks, related to transverse acoustic, longitudinal acoustic, second-order acoustic, and transverse optical (TO) modes of TiN, respectively, were observed in the Raman spectra of TiN particles. A very reasonable formation mechanism of TiN nanocrystalline powders was proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2004.00050.x
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  • 5
    Electronic Resource
    Electronic Resource
    Organothermal Synthesis and Characterization of Nanocrystalline ß-Indium Sulfide (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Uniform nanocrystalline β-In2S3 powders have been prepared by reacting the reagents at 140°C for 12 h using an organothermal process in nonaqueous solvents. XRD patterns and TEM images showed that the average particle sizes of the powders prepared in toluene and 1,2-dimethoxyethane (DME) were 8 and 16 nm, respectively. The particle sizes of nanocrystalline β-In2S3 powders synthesized by the organothermal process can be controlled by choosing different solvents. The specific surface areas of the products obtained in toluene and DME, which were measured by the BET method, were 74.92 and 36.20 m2/g, respectively. The products were analyzed by XPS, atomic absorption, and IR. The formation process of the nanocrystalline β-In2S3 has been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.1999.tb20086.x
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  • 6
    Electronic Resource
    Electronic Resource
    Current concepts on Escherichia coli K1 translocation of the blood–brain barrier (2004)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS immunology and medical microbiology 42 (2004), S. 0 
    Details
    ISSN: 1574-695X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The mortality and morbidity associated with neonatal gram-negative meningitis have remained significant despite advances in antimicrobial chemotherapy. Escherichia coli K1 is the most common gram-negative organism causing neonatal meningitis. Our incomplete knowledge of the pathogenesis of this disease is one of the main reasons for this high mortality and morbidity. We have previously established both in vitro and in vivo models of the blood–brain barrier (BBB) using human brain microvascular endothelial cells (HBMEC) and hematogenous meningitis in neonatal rats, respectively. With these in vitro and in vivo models, we have shown that successful crossing of the BBB by circulating E. coli requires a high-degree of bacteremia, E. coli binding to and invasion of HBMEC, and E. coli traversal of the BBB as live bacteria. Our previous studies using TnphoA, signature-tagged mutagenesis and differential fluorescence induction identified several E. coli K1 determinants such as OmpA, Ibe proteins, AslA, TraJ and CNF1 contributing to invasion of HBMEC in vitro and traversal of the blood–brain barrier in vivo. We have shown that some of these determinants interact with specific receptors on HBMEC, suggesting E. coli translocation of the BBB is the result of specific pathogen–host cell interactions. Recent studies using functional genomics techniques have identified additional E. coli K1 factors that contribute to the high degree of bacteremia and HBMEC binding/invasion/transcytosis. In this review, we summarize the current knowledge on the mechanisms underlying the successful E. coli translocation of the BBB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsim.2004.09.001
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  • 7
    Electronic Resource
    Electronic Resource
    A Novel Approach to Quantifying Surface Roughness in Grinding (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 339 (May 2007), p. 147-151 
    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: Surface roughness is an important quality characteristic in grinding. Measurement ofsurface roughness by means of mechanical stylus is widely done in metrology. In this paper, a newmachine vision system has been utilized to quantify the surface roughness of machined surfaces(ground and milled). Compared with other measurement methods, it is accurate, quick and credible.This system is mounted on the grinding machine and automates the measurement process by usingcomputer control to automatically position the CCD and capture digital images of machinedsurfaces between grinding cycles. It was proposed that the proportional formula was used incalibrating this system, and calibration precision meets application requirement. Not only thestatistic character of gray image but also which of edge image were calculated out. These charactersinclude the mean value of pixels (Mean), standard deviation (σ), maximal value (Max) and minimalvalue (Min), the number of pixels on the examine line(Count), etc. It was found out that thestandard deviation value σ of the gray image could express the surface roughness most. Thecorrelation between σ and Ra is established by interpolating σ value used Lagrange interpolationlaw, and the σ value is converted into Ra value through the calculation procedure finally
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.339.147.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Application of the Restoration Algorithm of Cutting Tool Images Based on Fuzzy Theory to Monitor Tool Wear Condition (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 315-316 (July 2006), p. 324-328 
    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 tool wear monitoring system based on the image processing and computer vision hasbetter study value and foreground. During the cutting, the cutting tool is always at the movementstate, thus, the real-time collected sequence images by CCD sensor are blurred with noise. As aresult, we have to confront the problem how to get the high quality images, which is researched bythis paper. The paper analyzes the reasons which causing the image blurred, brings forward adegradation function model and finds the degradation of tool wear images dues to the relativemovement. According to this function model and combined with the application of fuzzy theory, therestoration algorithm is obtained. The membership function dealing with degraded images ofcutting tools is put forward. It turns out that the images restored by this fuzzy restoration algorithmreach our aim
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.315-316.324.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Biosensor Application of Enzyme-Functionalized Titania/Titanium Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 645-648 
    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: Highly-ordered titania nanotube array has been fabricated by a potentiostatic anodizationprocess in acidic fluoride electrolyte. Calcination at high temperature is followed to achievecrystallization from amorphous to anatase phase. The approach of embedding bioactive enzymesinside titania tubule channels has been applied for bioactivation modification of titania/titanium.The electropolymerization process is applied by using conductive pyrrole monomer to achievesurface immobilization of enzymes to improve interfacial connection. Characterizations includingfield emission scanning electron microscopy, nano-indentation and linear sweep voltammetrymeasurements have been performed to fully evaluate the surface morphology, nanomechanical andelectrochemical properties of this composite. Molecule detection application has been investigatedby applying such an enzyme-titania/titanium composite
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.645.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Intelligent Tool Condition Monitoring System Based on Rough Sets and Mathematical Morphology (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 722-726 
    Details
    ISSN: 1662-7482
    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 image of cutting tools provides reliable information regarding the extent of tool wear.In this paper, we propose the theory of image processing based on rough sets and mathematicalmorphology to analyzing the flank faces which are chosen as our monitoring object. First, throughplotting the appropriate subset, the rough sets filter is used to enhancement the image of tool wear.Then, the mathematical morphology theory is applied to process the translated binary image. Finally,tool condition monitoring is realized by measuring the area of tool wear. This paper gives thecorresponding monitoring principal and proposes a new algorithm to process the cutting tool image.The algorithm is also flexible and fast enough to be implemented in real time for online tool wear ortool condition monitoring
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/38/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.10-12.722.pdf
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