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  • 2005-2009  (13)
  • 1995-1999  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    An electrostatic model of split-gate quantum wires (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 6361-6369 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a theoretical model of split-gate quantum wires that are fabricated from GaAs-AlGaAs heterostructures. The model is built on the physical properties of donors and of semiconductor surfaces, and considerations of equilibrium in such systems. Based on the features of this model, we have studied different ionization regimes of quantum wires, provided a method to evaluate the shallow donor density, and calculated the depletion and pinchoff voltages of quantum wires both before and after illumination. A real split-gate quantum wire has been taken as an example for the calculations, and the results calculated for it agree well with experimental measurements. This paper provides an analytic approach for obtaining much useful information about quantum wires, as well as a general theoretical tool for other gated nanostructure systems. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359108
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The two pKa's of aspartate-85 and control of thermal isomerization and proton release in the arginine-82 to lysine mutant of bacteriorhodopsin (1995)
    s.l. : American Chemical Society
    Biochemistry 34 (1995), S. 8820-8834 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00027a034
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Melatonin protects against MPTP/MPP+-induced mitochondrial DNA oxidative damage in vivo and in vitro (2005)
    Oxford, UK : Munksgaard International Publishers
    Journal of pineal research 39 (2005), S. 0 
    Details
    ISSN: 1600-079X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract:  The effects of melatonin on the mitochondrial DNA (mtDNA) damage induced by 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine (MPTP) and 1-methyl-4-phenylpyridine ion (MPP+) were investigated both in vivo and in vitro. MPTP (24 mg/kg, s.c.) induced a rapid increase in the immunoreactivity of 8-hydroxyguanine (8-oxoG), a common biomarker of DNA oxidative damage, in the cytoplasm of neurons in the Substantia Nigra Compact of mouse brain. Melatonin preinjection (7.5, 15 or 30 mg/kg, i.p.) dose-dependently prevented MPTP-induced DNA oxidative damage. In SH-SY5Y cells, MPP+ (1 mm) increased the immunoreactivity of 8-oxoG in the mitochondria at 1 hr and in the nucleus at 3 hr after treatment. Melatonin (200 μm) preincubation significantly attenuated MPP+-induced mtDNA oxidative damage. Furthermore, MPP+ time-dependently increased the accumulation of mitochondrial oxygen free radicals (mtOFR) from 1 to 24 hr and gradually decreased the mitochondrial membrane potential (Ψm) from 18 to 36 hr after incubation. At 72 hr after incubation, MPP+ caused cell death in 49% of the control. However, melatonin prevented MPP+-induced mtOFR generation and Ψm collapse, and later cell death. The present results suggest that cytoprotection of melatonin against MPTP/MPP+-induced cell death may be associated with the attenuation of mtDNA oxidative damage via inhibition of mtOFR generation and the prevention of Ψm collapse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-079X.2005.00209.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Biological and Biomechanical Properties of Chemically Modified SLA Titanium Implants In Vitro and In Vivo (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 309-311 (May 2006), p. 399-402 
    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 was to evaluate the interface shear strength and the responses of osteoblast-like cells to titanium implants with a sandblasted and acid-etched surface modified by alkali and heat treatments (SLA-AH). The implants with machined and SLA surface served as controls. Each type of implant was characterized by scanning electron microscopy (SEM) and energy-dispersive x-ray (EDX) analysis. In vitro assays were made using human osteoblast-like cellculture on different surfaces. The rectangle plates were also transcortically implanted into the proximal metaphysis of New Zealand White rabbit tibiae. After 4, 8 and 12 weeks implantation, mechanical and histological assessments were performed to evaluate biomechanical and biological behavior in vivo. By SEM examination, SLA surface combined with AH treatments revealed a macro-rough surface with finely microporous structure. The in vitro assays showed that theSLA-AH surfaces exhibited more extensive cell deposition and improved cell proliferation as compared with controls. Pull-out test demonstrated that the SLA-AH treated implants had a higher mechanical strength than the controls at all interval time after implantation. Histologically, the test implants revealed a significantly greater percentage of bone-implant contact when compared with controls. The results of this study suggest that a useful approach by combined processes couldoptimize implant surfaces for bone deposition and produce distinct biological surface features
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.309-311.399.pdf
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  • 5
    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
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  • 6
    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
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of Sr Content in Mg-Sr Alloys Using Faas (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 215-218 
    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: The Air-acetylene Flame Atomic Absorption Spectrometry (FAAS) was used to measureSr content in Mg-Sr Alloys. The experiment conditions including acetylene flow rate, measurementheight, flame wavelength were studied and the disturbing factors were discussed. It was found that, asdissolution agent of alloys and LaCl3 as the deionization agent and flame wavelength being 460.7nm,the detection limits is 1.16mg/L and the relative standard deviations is less than 0.3% and the recoveryrates of Sr is more than 95%. The advantages of this method were summarized as: high sensitivity andprecision, low chemistry disruption, good selectivity, good recurrence characteristics of themeasuring conditions. The method is suitable for the control analysis and sample-system analysis ofdetermination Sr content in the Mg-Sr Master Alloys
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.215.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Simulation of Gas-Solid-Liquid Three-Phase Flow Inside and Outside the Abrasive Water Jet Nozzle (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 833-836 
    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: Simulation of the velocity field of gas-solid-liquid three-phase flow inside and outsidethe abrasive water jet nozzle was studied by the computational fluid dynamics software (CFD). Thecomplicated velocity field of the flow in the abrasive water jet (AWJ) nozzle and the abrasive trackin the nozzle were obtained. In the course of the simulation, the inter-phase drag exchangecoefficient model uses Gidaspow model (gas-solid), Wen-yu model (water-solid), Schiller-Naumannmodel (water-gas) respectively. The simulation results indicate that the swirl is produced in thenozzle and the abrasives are accelerated and moved around the swirl, and they are all distributedalong the inner surface of the nozzle, the gas is mostly distributed in the center of swirl. Thedispersion of the flow happens when it flows out of the nozzle, it can be divided into three zones,that is core zone, middle zone and border zone. At the core zone the velocity changes little while thevelocity changes greatly at the middle zone, the velocity fluctuates greatly at the border zone
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.833.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Theoretical Analysis on the Machining Mechanism in Ultrasonic Vibration Abrasive Waterjet (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 315-316 (July 2006), p. 127-130 
    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: As a unique machining way, Abrasive Waterjet Machining (AWJ) is one of the fastestdeveloping new non-traditional machining methods and has a wide range of machinable materials.In this paper, the machining mechanism in AWJ is theoretically analyzed by impact dynamicmechanics method. There is stagnancy layer between waterjet and workpiece surface. It is foundthat the stagnancy layer and low energy abrasive particle are the main factors, which weakenmachining capability and effective utilizing ratio of energy of AWJ machining. UltrasonicVibration Abrasive Waterjet Machining, a new machining method, is put forward and the influenceof ultrasonic vibration on machining mechanism of AWJ machining is discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.315-316.127.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Simulation of Velocity Field of Two-Phase Flow for Gas and Liquid in the Abrasive Water Jet Nozzle (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 315-316 (July 2006), p. 150-153 
    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 on velocity field of gas-liquid flow in the abrasive water jet nozzle wasstudied by the computed fluid dynamics (CFD) software, The complex velocity field of the flow inthe abrasive water jet nozzle can be obtained by means of simulation. The study on the effect of thenozzle inner cone angle on the velocity field shows that the cone angle affects the whirlpool’sintension and position of the whirlpool in the nozzle of abrasive water jet (AWJ), and it also affectsvelocity ‘s magnitude and distribution of the velocity on the cone surface
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.315-316.150.pdf
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