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  • 1
    Electronic Resource
    Electronic Resource
    Polymerase chain reaction-based mutageneses identify key transporters belonging to multigene families involved in Na+ and pH homeostasis of Synechocystis sp. PCC 6803 (2002)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 44 (2002), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Primary ion pumps and antiporters exist as multigene families in the Synechocystis sp. PCC 6803 genome and show very strong homologies to those found in higher plants. The gene knock-outs of five putative Na+/H+ antiporters (slr1727, sll0273, sll0689, slr1595 and slr0415) and seven cation ATPases (sll1614, sll1920, slr0671–72, slr0822, slr1507–08–09, slr1728– 29 and slr1950) in the model cyanobacterium (http://www.kazusa.or.jp/cyano/cyano.html) were performed in this study relying on homologous recombination with mutagenenic fragments constructed using a fusion polymerase chain reaction (PCR) approach. The impacts of these gene knock-outs were evaluated in terms of Na+ and pH, and light-induced acidification and alkalization that are asso-ciated with inorganic carbon uptake. Two of the five putative antiporter mutants exhibit a characteristic interplay between the pH and Na+ dependence of growth, but only one of the antiporters appears to be necessary for high NaCl tolerance. On the other hand, the mutation of one of the two copper-trafficking ATPases produces a cell line that shows acute NaCl sensitivity. Additionally, disruptions of a putative Ca2+-ATPase and a gene cluster encoding a putative Na+-ATPase subunit also cause high NaCl sensitivity. The findings and possible mechanisms are discussed in relation to the potential roles of these transporters in Synechocystis sp. PCC 6803.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.2002.02983.x
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  • 2
    Electronic Resource
    Electronic Resource
    Three-Dimensional Computer Simulation of Ferroelectric Domain Formation (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Three-dimensional (3-D) computer simulations of ferroelectric domain formation and evolution were performed, using a computer simulation model based on the time-dependent Ginsburg-Landau equations. A cubic-to-tetragonal ferroelectric phase transition is considered. It is shown that the initial stage of the transition during the annealing of a quenched cubic paraelectric phase involves the nucleation and growth of the ferroelectric domains, followed by the domain coarsening leading to the formation of 90° and 180° domain structures. Part of the 3-D results reported here confirm our conclusions made earlier for the two-dimensional (2-D) case, namely, the nonlocal elastic interactions are critical to the formation of twin structure and the dipole-dipole interactions are responsible for the head-to-tail arrangements of dipoles at twin boundaries. In contrast to our previous work, and others; the effect of the depolarization energy was explicitly incorporated into the simulation model. It is found that when there are no surface charges to compensate the Lorentz field due to the polarization charges, and if the system is mechanically clamped, both 90° and 180° domains are thermodynamically stable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02367.x
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  • 3
    Electronic Resource
    Electronic Resource
    SL (2, R) coset constructions and two-dimensional gravity
    Amsterdam : Elsevier
    Physics Letters B 273 (1991), S. 445-449 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(91)90296-3
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  • 4
    Electronic Resource
    Electronic Resource
    Six-DOF Nanomanipulation Tools for Nanoscale Device Prototyping and Fabrication (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 823-828 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: With the progress of instrumentation in nanoscale visualization, tremendoussicentific dicoveries and understanding has been made. A great breakthrough innanotechnology came with the inventions of scanning tunneling microscope in 1982 andatomic force microscope in 1986. These revolutionary inventions opened the nanoworld toscientists and engineers by visualizing it with atomic resolution. However, the lack ofefficient nanomanipulation capability has become a bottleneck for creating devices usingnanocomponents both in the research community and industry. This paper presents the stateof-the-art of nanomanipulation concepts, manipulator designs, manipulator systems. Such anapproach has certain advantages over existing designs which have such limitations as devicesizes orders of magnitude too large for in situ applications and further device miniaturizationrestricted due to the adverse effect of physical scaling laws
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.823.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Single Crystal PMNT/Polymer 1-3-2 Piezoelectric Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1103-1107 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Lead magnesium niobate-lead titannate single crystal (abbreviated as PMNT) was usedto fabricate PMNT/polymer 1-3-2 piezoelectric composite with different volume fractions of PMNT,by dicing single crystal PMNT along mutually perpendicular two directions on the surface and thenfilling polymer into grooves. The piezoelectric, dielectric and electromechanical properties of thenovel composite were determined. It was demonstrated that a thickness electromechanical couplingcoefficient of the composites could reach as high as 0.75 and acoustic impendence decreased to14.9 Mrayls (lower than 30 Mrayls of PMNT). The pulse-echo waveforms of the compositeswithout backing were also measured. It showed a -6dB bandwidth of 88% at the center frequency of0.95MHz
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1103.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Interaction of Circular Lining and Interior Linear Crack by Incident SH-Wave (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 521-524 
    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 paper, the method of Green’s function is used to investigate the problem ofdynamic stress concentration of circular lining and interior linear crack impacted by incidentSH-wave. The train of thought for this problem is that: Firstly, a Green’s function is constructed forthe problem, which is a fundamental solution of displacement field for an elastic space possessing acircular lining while bearing out-of-plane harmonic line source force at any point in the lining. Interms of the solution of SH-wave’s scattering by an elastic space with a circular lining, anti-planestresses which are the same in quantity but opposite in direction to those mentioned before, areloaded at the region where the crack existent actually, we called this process “crack-division”.Finally, the expressions of the displacement and stress are given when the lining and the crack existat the same time. Then, by using the expressions, some example is provided to show the effect ofcrack on the dynamic stress concentration around circular lining
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.521.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    A Theoretical Model for Squeeze Film Dampers Operating with Air Entrainment (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1683-1687 
    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 continuum model of the evolution of air ingestion and entrainment for open-endedsqueeze film dampers is proposed in this paper. Hydrodynamic lubrication theory is extended tolubrication with mixture of a Newtonian liquid and an ideal gas. The solution to the universalReynolds equation is determined numerically using a control volume method (Elrod algorithm) andthe forth-order Range-Kutta method. This method conserves mass throughout the computationaldomain including air ingestion and entrainment. Excellent agreement is found with the experimentalworks of Diaz and San Andrès for the squeeze film damper [1, 2]
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1683.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Fatigue Properties of Spherical Graphite Iron Crankshafts (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2744-2748 
    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 crankshafts of semi-finished products were manufactured by two processes: as-castfollowed by normalizing and iron mould with sand liner as-cast. Then those were machined andnitridized followed by the bending fatigue test. At last mechanical properties and impact properties ofsampled crankshafts were tested. The mechanical properties are similar in the crankshafts treated byboth of the processes, however, the bending fatigue limits of as-cast spherical graphite ironcrankshafts are much higher than that of normalized spherical graphite iron crankshafts, whose crackproducing work and extending work is higher as well. The higher extended work is considered torelate to the oeil-de-boeuf ferrite and graphite structure and pearlite in as-cast spherical graphite ironcrankshafts, while the normalized ones with lower fatigue limit value are composed of sphericalgraphite and pearlite. Cracks having initiated in the graphite, the tips of cracks can be blunted and thecrack propagation can be impeded efficiently by ferrites surrounding the graphite in this structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2744.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Optimization of Materials and Modal Analysis for Motorcycle Frame (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2851-2854 
    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 FEM was used to analyze the stress distribution of a motorcycle frame on the conditionof normal running, starting up, turning and braking, respectively. Having been carrying on the2000km of running test, the initial design motorcycle frame was found several cracks or fractures inthe bending points of the square tube and in the welding seam, whose reasons were analyzed then. Themetallographical structures of materials and crack parts of the frame were observed and analyzed andQ235. Based on the results mentioned above, the Q345 steel(Chinese steel mark) was used to replacethe Q195 steel in the bending square tube and the prop of the steering column. And the welding andmanufacture processes were optimized and improved. Finally, the motorcycle frame whose materialshad been optimized could keep running in good condition and satisfy the demands after 16000km ofrunning test
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2851.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Pulsed Power Supply of Ferroelectric Ceramics by Shock-Induced Depoling (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 18-20 
    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 frame of shock-induced depoling, PZT 95/5 ferroelectric ceramics with niobium dopedhas been assembled for the pulsed power supply, and the electrical current output has been investigatedunder the action of shock wave in a "normal mode". The electrical response of LRC load especially for thesmall resistance (R) and small inductance (L) load was studied. Plane-shock-wave tests were conducted,and the PZT 95/5 ceramics stacked in parallel were devised to generate high-power electrical pulse. Anoutput current of 7 kA has been obtained, and the corresponding rise time of the front edge is under 500ns. Theoretical calculations were conducted and a good agreement with the experiment presented
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.18.pdf
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