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  • 2005-2009  (7)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Topographic Variability of the Esophageal Left Atrial Relation Influencing Ablation Lines in Patients with Atrial Fibrillation (2005)
    350 Main Street , Malden , MA 02148-5018 , USA , and 9600 Garsington Road , Oxford OX4 2DQ , UK . : Blackwell Science Inc
    Journal of cardiovascular electrophysiology 16 (2005), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Introduction: The close anatomic relationship of the posterior wall of the left atrium (LA) and the thermosensitive esophagus creates a potential hazard in catheter ablation procedures. Methods and Results: In 30 patients (pts) with atrial fibrillation (AF) undergoing catheter ablation, we prospectively studied the course and contact of the esophagus in relation to LA and the topographic proximity to ablation lines encircling the right-sided and left-sided pulmonary veins (PV) as well as to the posterior line connecting the encircling lines using the electromagnetic mapping system for reconstruction of LA and for tagging of the esophagus. This new technique of anatomic tagging of the esophagus was validated against the CT scan as a standard imaging procedure. The esophageal course was highly variable, extending from courses in direct vicinity to the left- or right-sided PV as well as in the midportion of the posterior LA. In order to avoid energy application in direct proximity to the esophagus, adjustments of the left and right PV encircling lines were necessary in 14/30 pts (47%) and 3/30 (10%). In 30 pts (100%), the mid- to inferior areas of the posterior LA revealed contact with the esophagus. Therefore, posterior and inferior linear ablation lines were abandoned and shifted to superior in 29 pts (97%). Conclusions: Anatomic tagging of esophagus revealed a highly variable proximity to different areas of the posterior LA suggesting individual adjustment of encircling and linear ablation lines in AF ablation procedures to avoid the life threatening complication of esophagus perforation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1540-8167.2005.40604.x
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  • 2
    Electronic Resource
    Electronic Resource
    Separation of Primary Stress in Finite Element Analysis of Pressure Vessel with the Principle of Superposition (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 373-376 
    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: A key problem in engineering application of “design by analysis” approach is how todecompose a total stress field obtained by the finite element analysis into different stress categoriesdefined in the ASME Code III and VIII-2. In this paper, we suggested an approach to separate primarystress with the principle of superposition, in which the structure does not need to be cut into primarystructure but analyzed as a whole only with decomposed load. Taking pressurized cylindrical vesselwith plate head as example, the approach is demonstrated and discussed in detail. The allowable loaddetermined by the supposed method is a little conservative than that determined by limited loadanalysis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.373.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Encapsulated Titanium Oxide with Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 and its Ultraviolet Shielding Properties (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 373-374 (Mar. 2008), p. 706-709 
    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 work, we encapsulated the titanium oxide particles with a layer of Al2O3 by asol-gel process and investigated the UV-shielding properties of the obtained Al2O3-TiO2 composites.In this method, Al(NO3)3 aqueous solution mixed with raw titanium oxide powder was hydrolyzedby adding NH3·H2O. The hydrated materials were calcined at 500°C and then the composite ofAl2O3-TiO2 was prepared. Different techniques including ICP-AES, XRD, SEM-EDS, and TEMwere used to characterize the raw TiO2 and encapsulated TiO2 particles. Chemical analysis showedthat TiO2 mass content in the raw titanium oxide particles is 98.25%, and Al2O3 is just 0.75%. Aftermodification, the percentage Al2O3 was increased to 4.48% due to the encapsulation of Al2O3. Traceelements analysis displayed that the concentration of the trace elements were much lower than theiroriginal content in the raw titanium oxide, which prove that proved that there was no impuritiesincorporated into in the sol-gel process. XRD analysis indicated that the modified titanium oxidepowders are mainly in phase of rutile, ca. 99.1%, and the profiles exhibit no peaks of crystallineAl2O3 suggesting the layer of Al2O3 exists in amorphous phase. SEM image suggests that the size isin 80~600nm of the raw TiO2 granula and became rougher on the surface, the packing of theagglomerations got looser after modification with Al2O3. HRTEM image shows that the TiO2particles was evenly coated with a packed layer ~8 nm in thickness. The UV-Vis absorbencyexperiments showed that the range of wavelength shielded was narrowed from 208-316 nm in theraw titanium oxide to 225-285 nm in the case of the Al2O3-TiO2. The average absorbency of UVwas improved from 1.07 to 1.98 at the same content 1.0 μg/mL in the suspended solution. Theresults reflected that Al2O3 modification process improve the titanium oxide particles UV-shieldingproperties in selectivity and performance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.706.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    A Proposed Thickness Distribution of Elbow Resisting Ratcheting (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 377-380 
    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: With the analysis of thickness distributions of elbow by the equal-strength criterion andplastic deformation by pushing bending process, an ideal thickness distribution is proposed with theconsideration of elbow processing characteristics to improve its ratcheting resistance. Ratcheting ofelbows under internal pressure and reversed in-plane bending is analyzed with Chaboche model byfinite element method, which shows that elbows with the proposed thickness distribution have greatresistance to ratcheting compared with equal thickness elbows
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.377.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of Functional Geopolymer (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 977-979 
    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: The geopolymer has been prepared from fly ash, metakaolin and Quartz sand, by usingthe liquid sodium silicate as structural template and sodium hydroxide solution as activator. Theeffect of glass fiber on the properties of the geopolymer has been studied
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.977.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of β-SiAlON Ceramics from High Aluminium Fly Ash via Carbothermal Reduction-Nitridation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 587-590 
    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: In this work, β-sialon ceramics were prepared from high-aluminium fly ash viacarbothermal reduction-nitridation (CRN) and the physicochemical properties of the materials such asbulk density, apparent porosity, water absorption and flexural strength were also discussed. Theresults showed that the percentage of β-sialon phase in the product decreases as the temperatureincreases from 1400°C and the weight of the sintered specimen experienced an increase during1350°C~1450°C due to the nitridation reactions, and followed by a gradual decrease till 1550°C forthe decomposition of β-sialon. It is indicated that the optimum sintering temperature to obtain thehighest yield of β-sialon ~93% lies in 1400°C~1450°C. The SEM images revealed that the preparedβ-sialon sintered at 1400°C were mainly in shape of elongated prisms, typically ~5μm in length and0.5~1μm in width. As the temperature increased to 1500°C and above, β-sialon decomposed and thenew phases of SiC and AlN were formed at 1550°C as confirmed by XRD
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.587.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation of Sulphoaluminate-Alite Composite Mineralogical Phase Cement Clinker from High Alumina Fly Ash (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 421-424 
    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: Sulphoaluminate-alite cement (SAAC) was successfully prepared from high alumina flyash. XRD analysis indicated that the optimal mineralogical phase of cement clinker was obtainedunder condition of MG=1.05, MS =0.95 at 1300oC, and C4A3 S reached the strongest intensity andis 58.73% in the phase of calcined clinckers. SEM observation showed that C4A3 S are welldeveloped into regular diamond/hexagon-shaped crystal with the size of 1~3.5 μm in the clinker.Hydrated clinker exhibited its new formed dominant phases in AFt, C-S-H and Afm. Pillar shapedAFt and sheet shaped AFm coexisted among the colloidal C-S-H substrate. It is demonstrated thatthe prepared cement shows a compressive strength of 27 MPa (1d), 36 MPa (3d), 49 MPa (28d),and flexural strength of 5.9 MPa (1d), 5.9 MPa (3d), 6.1 MPa (28d), indicated that the hydrationproduct owned a good mechanical strength at early ages and increased steadily in the later stages
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.421.pdf
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