ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Surface Characteristics of Ceramics Milled with Abrasive Waterjet Technology (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 329 (Jan. 2007), p. 335-340 
    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 surface characteristics of Si3N4 ceramics milled with abrasive waterjet millingtechnology is studied. The milled surface characteristics and the effect of process parameters onmilled surface roughness are analyzed. The results show that the milled surface roughness rangesbetween 0.55 and 1.1um at the milling conditions under consideration and is changed with thechange of process parameters. The milled surface roughness will be significantly decreased at themilling conditions of lower water pressure and larger lateral spacing. The effect of nozzle traversespeed on milled surface roughness is complex, but a traverse speed of 1000mm/min is the optimumspeed for AWJ milling Si3N4 ceramics. The milled surface roughness first decreases then increaseswith an enhancement of standoff distance from 10mm to 30mm, and it also significantly decreaseswith the increase in abrasive mesh. Therefore, the medium standoff distance of 20mm and finerabrasive are the optimum conditions for AWJ milling Si3N4 ceramics with the process parametersunder consideration
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.329.335.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Couple Stress Model of Steric Stiffening in Nanoporous Solids (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 730-733 
    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: Porous solids are less stiff than the solid, but its stiffness can be increased if the elastic propertiesof the struts within are sterically stiffened. The stiffening behavior cannot be modeled by conventionalstrain-based finite element method but can be modeled using couple stress mechanics. In this investigation, anew finite element modeling approach (FEM) based on strain field similitude is developed. Theconventional displacement field was used to determine the steric rotation gradients and the additionalhigh-order deformation energy. The mechanics basis underpinning the methodology and the conditions ofapplicability were detailed, and the results were benchmarked with analytical solution and experimental data.Finally, the methodology was applied to a periodic cellular structure to demonstrate the effect of stericstiffening in nanoporous solids
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.730.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Three-Dimensional Simulation of Liquid-Solid Two-Phase Flow Inside the Abrasive Water Jet Nozzle (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 329 (Jan. 2007), p. 329-334 
    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: Three dimensional simulation of the velocity field of solid-liquid two-phase flow insidethe abrasive water jet nozzle was studied by the computational fluid dynamics software (CFD). Thecomplicated velocity field and vectorgraph of the flow in the abrasive water jet nozzle was obtained.In the course of the simulation, the Syamlal-O’Brien model was used to decide the inter-phase dragexchange coefficient. The velocity vectorgraph simulation results indicate that the highest flowspeed is occurred at the inlet of the mixing chamber and the flow speed is gradually decreased alongthe direction of the nozzle axis and got to the lowest speed at the outlet of the nozzle. And also theflow speed in the cross section of the mixing chamber is gradually reduced along the radialdirection of the cross section and got to the lowest speed in the verge of the chamber. Thecomparison of simulation result for the velocity field of water and abrasive exhibits that the velocityof water in the mixing chamber is three or four times higher than that of abrasive
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.329.329.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Effects of Mechanical Strain on Osteoblastic Precursor Cells in a Three-Dimensional Scaffold (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1181-1184 
    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: It was well recognized that mechanical strain plays a crucial role in periodontal tissuesremodeling. The aim of this study was to investigate the effect of mechanical strain on osteoblasticprecursor cells in a collagen type I gel scaffold. Rat MSCs were isolated and cultured according tothe established method. Cells were induced with osteogenic medium, then seeded in a collagen typeI gel and mechanically stretched by application of cyclic biaxial strain 24h later. Strain cycle was setto 1 cycle/min (0.017Hz), and strain magnitude was set to 2%, 5%, 7% elongation. Cells werecollected in 0h, 3h, 6h, 9h, 12h, 24h and 48h respectively. ODF and ICAM-1 mRNA were analyzedby RT-PCR assay. The results shown that 2-7% elongation strain, either dynamic or static, inhibitedICAM-1and ODF expression of osteoblastic precursors, and the effects were relative tightly to strainmagnitude. The inhibition effects of dynamic strain loading group exceeded the corresponding staticstrain. This work suggested that appropriate mechanical strech may suppress differentiation ofosteoclasts through inhibiting expression of ICAM-1 and ODF. Application of mechanical stressmight have a beneficial effect on quantity of generated bone tissue and might be a important factorin tissue engineering of periodontal tissues
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1181.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Manufacture Process of Light Calcium Carbonate from Limestone (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1843-1845 
    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 process and parameters of fabricating light calcium carbonate from limestone werediscussed in the paper. Raw limestone in experiment comes from Luquan city, Hebei province. Theresults of chemistry and XRD analysis indicate that ingredient of this limestone is mainly calciumcarbonate, dolomite, silicon dioxide, which takes 83.81%, 11.03% and 1.67% separately, and a few ofother impurities. The process includes calcinations, assimilation, carbonation, drying and others. It wasascertainable that the time of calcinations exceeded 5 hours at 850~ 950[removed info] and loss of calcinations was42%. The time of assimilation was around 25 minutes at 70~90[removed info]The time of carbonation was about 30minutes at 50~90[removed info], and the airflow was about 160L/min and PH of latex after carbonation was 7.2~7.4.The light calcium carbonate product was obtained in experiment, whose fine sphere size was about 10nanometer, with the agglomeration particle size 2~3μm. The degree of white improved from 42 to 76. Asa result, the comprehensive properties of the produce were improved consumedly
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1843.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Cracking Stress of Nano-Fibers Composite Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2432-2435 
    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: Recent experiment showed that nano-fibers composite ceramics, fabricated through SHSprocess, could acquire high toughening and strengthening. Composite ceramics are mainly composed offiber eutectic with random orientation, in which nanometer sized zirconia fibers are dispersed within thealumina matrix. First, it can be visualized that tensile force is transmitted from the matrix to thenano-fiber by means of shear stress that develop along the fiber- matrix interface. Then the shear stress onthe surface of the fiber eutectic is obtained. It related to the volume fraction and slenderness ratio of thenano-fibers, and external strain of the fiber eutectic. The maximum shear stress is at the ends of the fibereutectic perpendicular to applied tensile stress. As maximum shear stress on the surface of the fibereutectic is equal to the critical shear stress, the composite ceramics would crack. So the applied tensilestress on composite ceramics arousing the surface crack of the fiber eutectic is gotten
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2432.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Fabrication and Mechanical Properties of SiC〈sub〉f〈/sub〉/SiC Composites via Polycarbosilane Pyrolysis (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1254-1256 
    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: Continuous SiC fiber reinforced SiC composites were fabricated by PIP route and their microstructuresand mechanical properties were characterized. The density, flexural strength and fracturetoughness of the composites were 1.88 g/cm3, 307 MPa and 8.24 MPa⋅m1/2, respectively. The lowmechanical properties were ascribed to low density and strong interfacial bonding. The compositesexhibited poor oxidation and thermal shock resistance; however, they showed desirable thermal stability
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1254.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    SAXS Characterization of Nanochannels in Polymer-Derived SiC Fibers (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1301-1303 
    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 the preparation of polymer-derived SiC fibers, nanochannels are believed to be formed in theearly pyrolysis stages due to loss of large volumes of pyrolysis gases. In this paper, small angle X-rayscattering (SAXS) was applied to the characterization and calculation of nanochannels in partiallypyrolyzedSiC fibers. The SAXS measurements showed that nanochannels with a radius of 1.0-20 nmwere formed for fibers heat-treated at 973K and 1173K. But their distributions were not continuous and atlower part of the distribution, a peak value was observed at about 1.2nm. This means if the nanochannelsare finely controlled, the partially-pyrolyzed SiC fibers have great potential application in the fields ofhydrogen storage, gas separation, and so on
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1301.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Simulation of Solid-Liquid Two-Phase Flow Inside and Outside the Abrasive Water Jet Nozzle (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 339 (May 2007), p. 453-457 
    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: Simulation of the velocity field of solid-liquid flow inside and outside the abrasive water jetnozzle was studied by the computational fluid dynamics software(CFD). The velocity field of theflow in the abrasive water jet (AWJ) nozzle was obtained. The results indicate that the swirl isproduced in the nozzle and the abrasives are all distributed along the inner surface of the nozzle. Thevelocity at the center of the outlet face is the highest, while it is smallest at the both edge. Thedispersion of the flow is happened when it flows out of the nozzle, but the flow velocity away fromthe outlet at a distance of about 4 times of the outlet diameter changes little. The fillet diameter, theinner cone angle, the length of mixing tube of the nozzle greatly affect the field of two-phase flow.The velocity of outlet increases with an increase in the fillet diameter, the flow becomes ease whenthe cone angle decreases, the mixing tube hampers the two-phase flowing
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.339.453.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    An Experimental Study on Milling Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Ceramics with Abrasive Waterjet (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 339 (May 2007), p. 500-504 
    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 machining performance of Al2O3 ceramics is studied by abrasive waterjet (AWJ)milling experiment. The machined surface characteristics and the effect of process parameters onmachined surface quality are analyzed. The results showed that the nozzle traverse speed and traversefeed have a strong effect on the machined surface quality. The effect of process parameters onmaterial volume removal rate and the milling depth is also researched. The results indicated that thematerial volume removal rate and the milling depth would be increased at the milling conditions ofhigher water pressure and bigger standoff distance. However, the milling depth will decrease at themilling conditions of higher traverse speed and higher traverse feed, and the material volume removalrate has a complex variation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.339.500.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...