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  • 1
    Electronic Resource
    Electronic Resource
    A Study of Judder Vibration in Automotive Disk Brakes (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1301-1304 
    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 experimental paper, the judder vibration of automotive disk brake was analyzed bythe finite element method and compared with experimental results. The relationship betweenspecific modes of disk and pad, and hot spot was investigated. Characteristics of the juddervibration were measured by using the chassis-dynamo and hot spots were photographed by highspeedinfrared camera. Vibration modes of the brake disk and pad were measured and an specificrelationship between mode shapes and hot spots was found. Results show that the judder vibrationoccurred due to the frequency modulation of the specific mode frequency of disk brake due to thenon-linearity phenomenon. This relationship was examined by the frequency analysis of the juddervibration
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1301.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    High-Velocity Impact of Carbon/Epoxy Composite Laminates (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 73-76 
    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 response of Carbon/epoxy composites under high velocity impact was investigatedexperimentally. The strain rate dependent behavior of T300 Carbon/epoxy matrix composite intension is studied experimentally by split Hopkinson bar technique. Dynamic stress-strain plot wasobtained and compared with the quasi-static tensile test results. The results of the study indicate thatCarbon/epoxy composites are strain rate dependent materials. Stacking sequence has a significanteffect on the material response. Tensile strength of the composites all increased with increasingstrain rate. And failure strain decreased when strain rate increased
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.73.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    A Novel Polycaprolactone/Hydroxyapatite Scaffold for Bone Tissue Engineering (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 265-268 
    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 study, novel polycaprolactone/hydroxyapatite (PCL/HA) scaffolds were prepared toincrease mechanical properties and degradation of PCL/HA ones for bone tissue engineering. PCLmacromers were synthesized through the reaction of PCL diol (Mn: 530, 1250, and 2000) and PCL triol (Mn:900) with acryloyl chloride and confirmed using nuclear magnetic resonance spectrometer (NMR) andfourier transform infrared (FTIR). The PCL/HA scaffolds were prepared by cross-linking of PCL macromerin the presence of HA by UV treatment and freeze drying methods. Mechanical property and porosity as wellas degradability of the PCL/HA scaffolds were also investigated. PCL/HA scaffolds showed fasterdegradation and higher compressive modulus than those of PCL itself due to their low crystallinity andmodification of terminal groups. The pore morphology and pore sizes of the PCL/HA scaffold were checkedby scanning electron microscope (SEM). Cell cytotoxicity and proliferation of MG-63 osteoblast culturedonto the PCL/HA scaffold was assessed by lactate dehydrogenase (LDH) assay and Alamar blue assay,respectively. The novel PCL/HA scaffold appears to be suitable for bone substitutes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.265.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Glucosylated Polypropylenimine Dendrimer as a Novel Gene Carrier (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 457-460 
    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: Polypropylenimine (PPI) dendrimers have been used by many researchers as genedelivery carriers due to their high functionality. Glucose as a kind of carbohydrate is biocompatibleand hydrophilic. In this study, we synthesized glucosylated PPI (G-PPI) dendrimers to reducecytotoxicity. Glucose substitution of G-PPI dendrimers was determined by the sulfuric acid micromethod.The G-PPI dendrimer was complexed with plasmid DNA in various N/P ratios, and thecomplex was characterized. G-PPI dendrimers showed good DNA binding ability and highprotection of DNA from nuclease attack. The G-PPI dendrimer had low cytotoxicity compared toPPI dendrimer by cytotoxicity assay. Also, transfection efficiency was influenced by glucosylationdegree and the transfection efficiency for the G-PPI-5 was slightly higher than that of PPIdendrimer in HeLa cell line
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.457.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Experiment Study and Finite Element Analysis of Spring Constant of Welded Metal Bellows (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 537-540 
    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 study tries to obtain the spring constant of welded metal bellows throughexperimental and numerical method respectively. The prediction of spring constant plays a greatrole in the design and application of the welded metal bellows. To derive the spring constant of thebellows, we employ commercial package to build up 2 axi-symmetric FEM models by using plane42 and shell 51 elements. In the experiment, we use UTM to measure the spring constant of thebellows. And, the predicted spring constant resulting from the analysis is compared with theexperimental one to discuss the rationality of spring constant analysis. The analytical resultscorrespond well with experimental data and hence explaining the validity of FEM model
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.537.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    A Study on the Lower Flanges Fracture of Endplate Bolted Connection (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 983-986 
    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 quasi-static tests on the endplate bolted connections of the new structure systemconsisting of SCC beam and CCSHRC column are briefly introduced in this paper. Meanwhile, the3-D solid finite element models of the connections with pre-existing cracks in the lower flange’shigh stress fields are set up by ANSYS. The material nonlinearities of concrete, steel and bars,together with the contact between the endplate and column surface are all considered in the model.With the transverse load applied on top of columns, the fracture parameters are calculated by APDL.The results indicate that the opening mode crack will happen mainly. When the pre-existing cracklength is 2.50mm and the inter-storey drift is less than 6mm, the stress intensity factor values agreewell with the converting values derived from J-integral and the crack tip fields are in elastic state.The J values are highly influenced by the pre-existing crack length, while seldom influenced by theconcrete compression strength. Moreover, the J-integral have the trend to sharply increase when thepre-existing crack length is larger than 0.61mm, and the pre-existing crack will grow during loadingwhen its length is larger than 1.35mm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.983.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Spectral FEM-Based Dynamic Characterization of Structural Joints: Theory and Experiment (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1629-1632 
    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 spectral element (SE)-model based frequency-domain method was proposed in theprevious work [1] to identify the dynamic characteristics of a structural joint within onedimensionalstructures. In the present work, experimental work is conducted to verify the proposedmethod. The bolt-joint is represented by an equivalent joint model with four parameters, and thefour parameters are determined by experimentally measured FRF data. The experimentallyidentified bolt-joint is shown to provide the dynamic responses which are in good agreement withmeasured dynamic responses
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1629.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Nonplanar Nonlinear Vibration Phenomenon on the One to One Internal Resonance of the Circular Cantilever Beam (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1641-1644 
    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: Experimental and theoretical study of the non-planar response motions of a circularcantilever beam subject to base harmonic excitation has been presented in this paper work.Theoretical research is conducted using two non-linear coupled integral-differential equations ofmotion. These equations contain cubic linearities due do curvature term and inertial term. Acombination of the Galerkin procedure and the method of multiple scales are used to construct afirst-order uniform expansion for the case of one-to-one resonance. The results show that the nonlineargeometric terms are very important for the low-frequency modes of the first and secondmode. The non-linear inertia terms are also important for the high-frequency modes. We present thequantitative and qualitative results for non-planar motions of the dynamic behavior
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1641.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Release of All-Trans Retinoic Acid (RA) from RA-Loaded Poly(Ester Amine) Based on Polyethylenimine and Polycaprolactone for Intracellular Delivery (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 429-432 
    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 objective of this study is to develop a new type of cationic nanoparticles for theintracellular drug delivery to breast cancer. Poly(ester amine) (PEA) based on polyethylenimine andpolycaprolactone was synthesized to make cationic PEA nanoparticles for all-trans retinoic acid(RA). In the 1H-NMR study, the proton signals of RA appeared in the spectrum of RA-loaded PEAnanoparticles in CDCL3, whereas they disappeared in D2O, suggesting that hydrophobic inner-corewith hydrophilic outer-shell formed in water. RA release was faster at lower drug content and RAwas released over a period of 20 days. RA-loaded PEA nanoparticles showed enhanced cytotoxicitycompared with RA itself, whereas nanoparticles of PEA themselves did not show it. These resultsindicated that the cationic PEA provided an efficient intracellular delivery of RA
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.429.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    A Poly(β-Amino Ester) of Spermine and Poly(ethylene Glycol) Diacrylate as a Gene Carrier (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 425-428 
    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: Vectors are vital aspect of gene delivery system which decides the success of genetherapy. Efficient transfection with minimum or no toxicity, are two principal aims of any genedelivery system. In this our study, we rationally developed biodegradable water soluble poly(ßaminoester) (PAE) based on spermine (SPR) and poly (ethylene glycol) (PEG), by Michael-typeaddition reaction and further studied for its potential as a gene carrier. Confirmation of synthesizedPAE was done by proton NMR spectroscopy. In gel retardation assay, the PAEs have shown goodDNA binding ability over wide range of polyplexes. The addition of PEG over SPR resulted in anovel PAE with higher degree of safety and transfection efficiency as compared withpolyethylenimine 25K (PEI) when studied in 293T human kidney carcinoma cells
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.425.pdf
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