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  • 1
    Electronic Resource
    Electronic Resource
    Automatic Visual Inspection for Leather Manufacture (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 469-472 
    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 visual inspection system was developed for defects detection on leather surfaces,which is an important component of automatic CAD/CAM cutting systems. The main functions ofthe system are quality control and raw material cutting. An efficient algorithm, which combinesmultiresolution approach, energy and entropy matrices, is presented for detection of defectsembedded in leather surface images. A wavelet band selection procedure was developed toautomatically determine the number of resolution levels and decompose subimages for the bestdiscrimination of defects and removals of repetitive texture patterns in the image. An adaptivebinary thresholding is then used to separate the defective regions from the uniform gray-levelbackground in the restored image. The proposed methodology is able to efficiently detect severaltypes of defects that current approaches cannot detect, and is fast enough to be used for real-timeleather inspection
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.469.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Pulsed Micro-Electrochemical Machining Technology (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 339 (May 2007), p. 327-331 
    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: This research work aims to explore the feasibility of applying electrochemical machining(ECM) to micromachining. An experimental setup for micro-ECM has been developed. Lowermachining voltage, lower concentration of passivity electrolyte, high-frequency short-pulse powersupply and micro tool electrode rotating at high speed have been synthetically adopted to localize thedissolution area in micro-ECM, so the machining gap can be kept at about 10 μm and the betterresolution of machined shape is achieved. A micro-hole with 45μm diameter is drilled on the stainlesssteel foil with 100μm thickness. A new approach of fabricating microstructure by micro-ECMmilling with a simple micro electrode is proposed, and the micro beam with width of about 50μmwhich has high precision is fabricated by micro-EC milling on the stainless steel foil (1Cr18Ni9Ti)with 300μm thickness. A mathematics model has been established, which can be used to simulate theprocess of shaping workpieces in the process of micro-ECM
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.339.327.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Study to Enhance the Precision of Micro-EDM (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 339 (May 2007), p. 26-31 
    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: Considering the key technologies to enhance the accuracy of micro-EDM, a micro-EDMsystem and some techniques are researched. In this system, a micro-energy pulse power supplywhose open voltage and capacitance can be adjusted is developed. The detection and controlsubsystem of the machining process is designed and applied. A simple method of machining highprecision microelectrodes is adopted. The forming mechanism of the gap in EDM process isanalyzed theoretically. The processing experiments are carried out on the system, and the resultsbasically coincide with the theoretical analysis. The experimental results of machiningmicroelectrodes and micro holes show that the Ø4.5±0.5μm microelectrodes can be ground, and theØ6±2.0μm micro holes can be drilled
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.339.26.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Geometry Factors on Dynamic Fracture Behavior for Mechanical Heterogeneous Welded Joint (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 543-546 
    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: Welded joint is a mechanical heterogeneous body, which is composed of base metal, weldmetal and heat affected zone (HAZ). Many welded structures endure dynamic load in service.Mechanical heterogeneity has important influence on dynamic fracture behaviour of welded joint.In the present investigation, dynamic fracture parameter of J-integral of undermatchedthree-point-bending (TPB) welded joint specimens containing longitudinal crack with differentgeometry were computed. The strain rate near crack tip reaches 103 under the impact velocity of5m/s, so dynamic properties under corresponding strain rate should be used in dynamic analysis.The results of instrumented impact experiment were used as the input parameters in thecomputation. Dynamic J-integral was evaluated using virtual crack extension (VCE) method ofMARC finite element code in 3-D condition. Dynamic J-integral evaluated by VCE method is pathindependent. The value of dynamic J-integral curve increases with loading time smoothly, so inertiaforce has little influence on dynamic J-integral. The values of dynamic J-integral decrease withincrease of weld width. When the weld width is bigger than 5mm the influence of base material onweld metal is not evident. The influence of initial crack length on dynamic J-integral is complicate.The value of dynamic J-integral of the computation model with initial crack length of a/W=1/4 isthe highest, and that of the computation model with initial crack length of a/W=1/8 is the lowest.The results are helpful for dynamic fracture evaluation of macro-heterogeneous welded joints
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.543.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    "In Situ-Tracking” Observation of Stainless Steel Microstructural Development during Elevated Service Using EBSD and SEM (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 2087-2090 
    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: Electron backscatter diffraction (EBSD) has been developed as a novel technique forcharacterizing crystallographic textures in recent years. The present paper proposes an“in-situ-tracking” approach using SEM and EBSD to examining the microstructural development andgrain boundary variation of stainless steel during elevated 1200 ºC service. The results revealed that inaddition to the coarsened grains the fraction of low angle grain boundaries (LABG) became increasedand flattened obviously during service. Comparing to the regular high temperature service (below 900ºC), the present “recovery and recrystallization” process was accelerated due to dislocation fastenedmovement and intensive interaction. However, the grain growth mechanism still meet thewell-accepted dislocation model of subgrain combination
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.2087.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    "In Situ-Tracking” Evaluation for Corrosion Progress at Fusion Boundary of Dissimilar Steel Welded Joints in H〈sub〉2〈/sub〉S Containing Solution (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 2245-2248 
    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 present work studied the corrosion property around the fusion boundaries of adissimilar steel welded joint in as-welded condition and after post-weld heat treatment (PWHT) inH2S containing solution with different times. An “in-situ-tracking” observation was proceeded forevaluating corrosive progress at the fusion boundary by using a scanning electron microscope(SEM). The results revealed that the fusion boundary was the worst region for corrosion resistancewhen comparing with other zones, and a broad boundary had a stronger resistance for “hydrogeninduced disbonding” than a narrow one
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.2245.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Study on Silver-Containing HA Coatings Prepared by Vacuum Plasma Spraying (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 841-844 
    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: Vacuum plasma sprayed (VPS) hydroxyapatite (HA) coatings with silver-loadedzirconium phosphate antimicrobial have been prepared on titanium substrate. Antibacterial effectsof the coatings were studied by bacteria culturing using Porphyromonas gingivalis (Pg),Fusobacterium nucleatum (Fn) and Actinobacillus actinomycetemcomitans (Aa) as microorganisms.Simulated body fluid (SBF) test was carried out to evaluate the bioactivity of the coatings as well.The results obtained showed that the coatings exhibited a marked antibacterial effect against Pg, Fnand Aa when the content of antimicrobial was equal to or more than 5%. The antibacterialcapability of the coatings decreased in the following order: Pg, Fn, Aa. Bone-like apatite layer wasformed on the silver-containing HA coatings after immersed in SBF, suggesting that theirbioactivities were not affected obviously by the addition of silver-zirconium phosphateantimicrobial. This study indicated that silver-containing VPS HA coating is a prospective candidateas dental material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.841.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Atmospheric science Stratospheric cooling and the troposphere (reply) (2004)
    [s.l.] : Nature Publishing Group
    Nature 432 (2004), S. 0 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fu et al. reply The success of our method for reconstructing tropospheric temperature trends is reinforced by Gillett et al., who show that our method is robust for reconstructing the tropospheric temperature trends, and that the statistical relationships between ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03210
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  • 9
    Electronic Resource
    Electronic Resource
    Contribution of stratospheric cooling to satellite-inferred tropospheric temperature trends (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 429 (2004), S. 55-58 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] From 1979 to 2001, temperatures observed globally by the mid-tropospheric channel of the satellite-borne Microwave Sounding Unit (MSU channel 2), as well as the inferred temperatures in the lower troposphere, show only small warming trends of less than 0.1 K per decade (refs ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02524
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  • 10
    Electronic Resource
    Electronic Resource
    Bulbocavernosus muscle flap in the repair of complicated vesicovaginal fistula (2005)
    Melbourne, Australia : Blackwell Science Pty
    International journal of urology 12 (2005), S. 0 
    Details
    ISSN: 1442-2042
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aim: To investigate the transposition of the bulbocavernosus muscle flap for repairing complicated vesicovaginal fistulas.Methods: Vesicovaginal fistulas were repaired via combined abdominal and perineal approaches. Through an abdominal approach, the fistula and surrounding scar tissue were excised thoroughly. A perineal incision was made between the orifices of the urethra and the vagina, dissecting until the fistula. The vaginal defect was closed through either the abdominal or the perineal approach depending upon its position. Through the abdominal approach, the bladder defect was closed in two layers with the suture lines vertical to each other. The bulbocavernosus muscle was freed through an incision between the labium majus pudendi and the labium minus pudenda, without damaging the pudendal vascular supply. The bulbocavernosus muscle flap was tunneled beneath the labium minus pudendi, and was sutured in place on the bladder wall over the fistula repair site.Results: Nine patients with complicated vesicovaginal fistulas were treated using this technique. After surgery, no symptoms of vagina leakage, urinary incontinence, or urethral stricture were reported by any of the patients, and they reported normal sexual function.Conclusions: Transposition of the bulbocavernosus muscle flap is an excellent technique with low morbidity and high success rate for repairing complicated vesicovaginal fistulas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1442-2042.2005.01200.x
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