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  • 1
    Electronic Resource
    Electronic Resource
    Swelling Behavior of Poly(Acrylamide) Nanoclay Composite Hydrogels (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 230-233 
    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: A series of nanocomposite (NC) hydrogels were synthesized by in-situ polymerization ofacrylamide (AAm) monomer using laponite XLS clay as a crosslinker. This paper focused on waterabsorbency of the NC hydrogels with various clay contents, at various pH values and ionic strengths.The influence of pH value on swelling behaviors showed that a maximum swelling ratio wasobserved at pH 11. The swelling abilities of the NC composites decreased in saline solution strength.Heat treatment of NC hydrogels improved the swelling capacity of the hydrogels
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.230.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Electrically Controllable Biomimetic Actuators Made with Multiwalled Carbon Nanotube(MWNT) Loaded Ionomeric Nanocomposites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 733-736 
    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: Biomimetic actuators that can produce soft-actuation but large force generation capability are of interest. Nafion, an effective ionomeric material from DuPont, has been shown to produce large deformation under low electric fields (〈10V/mm). This response is caused by a direct electro-osmotic effect due to the existence and mobility of cations and subsequent swelling and deswelling of the material. In this effort, multiwalled carbon nanotube (MWNT)/Nafion nanocomposites were prepared by a casting in order to investigate the effect of MWNT loading in the range of 0 to 7 wt% on electromechanical properties of the MWNT/Nafion nanocomposites. The measured elastic modulus and actuation force of the MWNT/Nafion nanocomposites are drastically different, showing larger elastic modulus and improved electromechanical coupling, from the one without MWNT, implying that the effective MWNT loading is crucial to develop high-performance biomimetic actuators
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.733.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The Characteristic Analysis of a Piezoelectric Actuator for Valveless Micropumps (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1511-1514 
    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 behavior of a circular piezoelectric actuator for volumetric micropump has beeninvestigated by using theoretical and finite element analyses. A modified theoretical model wasdeveloped to predict the behavior of a piezoelectric actuator induced by the applied voltage. Thetheoretical results for the diaphragm deflection were in good agreement with the results fromnumerical simulation. Based on the theoretical analysis, the effects of several important parameterson actuation performance have been investigated. These parameters include the dimensions andmechanical properties of the piezoelectric disk, bonding layer and elastic diaphragm materials.Consequently, it is thought that above theoretical model might be employed as a tool for design andoptimization of the piezoelectric actuator for micropump application
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1511.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    The Stress Concentration Factor (K〈sub〉t〈/sub〉) and Fatigue Crack Behavior on the Relative Defect Location in Monolithic Aluminum versus GLARE (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 952-956 
    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: To analyze the stress distribution and the crack initiation due to the location of the defects,artificial defects were made on the different locations of the high strength monolithic Al and GLAssfiber REinforced laminate (GLARE). Experimental study shows that the defect location in thevicinity of the circular hole was changed from ° = 90 4 θ to ° = 0 1 θ , the stress concentration wasincreased. The stress concentration of GLARE was about 15% higher than that of the monolithic Al.When the defect was at ° = 30 2 θ , Multi Site Damage (MSD) crack was found in the monolithic Al butnot in GLARE. Instead of MSD crack, a delamination was made in GLARE and that it resulted in theprevention against the second crack initiation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.952.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanical Design of Biomimetic Fish Robot Using LIPCA as Artificial Muscle (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1443-1446 
    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 paper presents a mechanical design of biomimetic fish robot using the LightweightPiezo-Composite Actuator (LIPCA). We have designed a mechanism for converting actuation ofthe LIPCA into caudal fin movement. The linkage mechanism consists of rack-pinion and four-barlinkage systems. Two kinds of caudal fins are fabricated such that the shapes resemblesubcarangiform and ostraciiform caudal fin shape, respectively, and then attached to the linkagesystem. The swimming test using 300 Vpp input with 1 Hz to 3 Hz frequency was conducted toinvestigate the effect of tail beat frequency and shape of caudal fin on the swimming speed. Themaximum swimming speed was reached when the device was operated at its natural swimmingfrequency. At the natural swimming frequency of 1.016 Hz, maximum swimming speeds were1.267 cm/s and 1.041 cm/s for ostraciiform and subcarangiform caudal fin, respectively. TheStrouhal numbers, which are a measure of thrust efficiency, were also calculated in order toexamine thrust performance of the present biomimetic fish robot
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1443.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Application of an Equivalent Circuit Model for Ionic Polymer-Metal Composite (IPMC) Bending Actuator Loaded With Multiwalled Carbon Nanotube (M-CNT) (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 309-311 (May 2006), p. 593-596 
    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: Biomimetic actuators that can produce soft-actuation but large force generation capability are of interest. NafionTM, an effective ionomeric material from DuPont, has been shown to produce large deformation under low electric fields (〈10V/mm). In this effort, multi-walled carbon nanotube (M-CNT)/NafionTM nanocomposites were prepared by casting in order to investigate the effect of M-CNT loading in the range of 0 to 7 wt% on electromechanical properties of the MCNT/NafionTM nanocomposites. The measured elastic modulus and actuation force of the MCNT/ NafionTM nanocomposites are drastically different, showing larger elastic modulus and improved electromechanical coupling, from the one without M-CNT. In this work, we attempted to incorporate an equivalent circuit analysis to address the effect of capacitance and resistance of such M-CNT/NafionTM nanocomposites that would differ from conventional IPMCs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.309-311.593.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    The budding yeast cohesin gene SCC1/MCD1/RHC21 genetically interacts with PKA, CDK and APC (1999)
    Springer
    Current genetics 36 (1999), S. 329-338 
    Details
    ISSN: 1432-0983
    Keywords: Key words Cohesin ; SCC1/MCD1/RHC21 ; Multicopy suppressor ; PKA ; CDC28 ; CDC20 ; PDS1 ; APC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cohesin is a protein that plays a key role in the cohesion and separation of sister chromatids. During the duplication of chromatids, cohesin holds sister chromatids together until the onset of anaphase, and thereby prevents the premature separation of sister chromatids which would otherwise jeopardize the faithful segregation of chromosomes. To investigate the molecular mechanisms of sister chromatid cohesion, we have isolated multicopy suppressors of a temperature-sensitive (ts) mutation in the SCC1/MCD1/RHC21 gene which encodes a component of the cohesin complex in budding yeast. Isolation of multicopy suppressors of rhc21-sk16 and further genetic analyses revealed that several distinct biological pathways are involved in the regulation of SCC1/MCD1/RHC21 function. Firstly, PDE2 and BCY1, each of which inhibits the activity of protein kinase A (PKA), suppressed the temperature sensitivity of the rhc21-sk16 mutant . Secondly, PDE2 suppressed the temperature sensitivity of the cdc16-1 mutant. These results suggest that SCC1/MCD1/RHC21 is negatively regulated by the PKA pathway via the anaphase promoting complex (APC). Thirdly, ZDS1, a multicopy suppressor of cdc28-1N, and its homologue ZDS2 were isolated as multicopy suppressors of rhc21-sk16. Furthermore, the rhc21-sk16 mutant did not grow in the presence of the cdc28-1N mutation. Hence, SCC1/MCD1/RHC21 is positively regulated by the mitotic CDK, CDC28. Finally, SCC1/MCD1/RHC21 was found to interact genetically with CDC20, an activator of APC. Overexpression of CDC20 suppressed the temperature sensitivity of rhc21-sk16, and rhc21-sk16 was shown to be synthetically lethal with cdc20-1. In addition, the growth of the rhc21-sk16 mutant was inhibited by overproduction of the anaphase inhibitor Pds1p, whose degradation is mediated by Cdc20p in APC-dependent proteolysis. The functional relationships between SCC1/MCD1/RHC21 and PKA, CDK or APC are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050507
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