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  • 2005-2009  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Kinetic Monte Carlo Simulation of Semiconductor Quantum Dot Growth (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1073-1076 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Performing an event-based continuous kinetic Monte Carlo (KMC) simulation, Weinvestigate the growth conditions which are important to form semiconductor quantum dot (QD) inmolecular beam epitaxy (MBE) system. The simulation results provide a detailed characterization ofthe atomic kinetic effects. The KMC simulation is also used to explore the effects of periodic strain tothe epitaxy growth of QD. The simulation results are in well qualitative agreement with experiments
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1073.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Heat Treatments on the Nb〈sub〉3〈/sub〉Sn Composite Strands (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 2023-2026 
    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: Nb3Sn superconductors are widely used in high magnetic field application. Internal tinprocessed Nb3Sn wires used for ITER coils (at 4.2K, 12T) were heated by two steps, local heattreatment and reaction heat treatments. The superconducting properties of Nb3Sn were investigated asa function of reaction heat treatment (HT) for strands during 625℃~665℃.To study the heattreatment effects on Jcn and n-value of Nb3Sn strands, different HT-parameters, i.e., annealingtemperature and times, were applied on the Nb3Sn multifilament strands
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.2023.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal Stabilities and Mechanical Interfacial Properties of Polyethresulfone-Modified Epoxy Resin (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 111 (Apr. 2006), p. 159-162 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The thermal stabilities and mechanical interfacial properties of a diglycidyl ether ofbisphenol-A (DGEBA) epoxy resin modified with different contents of polyethersulfone (PES) have been investigated. As a result, the curing reaction rate of DGEBA/PES blends was decreased with increasing the PES content. The blends exhibited slight decrease of thermal stabilities compared to the neat DGEBA. The mechanical interfacial properties, characterized by KIC, were significantlyincreased as the PES content increased
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.111.159.pdf
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Three-dimensional numerical simulation of g (2005)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 15 (2005), S. 872-893 
    Details
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Purpose - The quality of crystals grown in space can be diversely affected by the melt flows induced by g-jitter associated with a space vehicle. This paper presents a full three-dimensional (3D) transient finite element analysis of the complex fluid flow and heat and mass transfer phenomena in a simplified Bridgman crystal growth configuration under the influence of g-jitter perturbations and magnetic fields. Design/methodology/approach - The model development is based on the Galerkin finite element solution of the magnetohydrodynamic governing equations describing the thermal convection and heat and mass transfer in the melt. A physics-based re-numbering algorithm is used to make the formidable 3D simulations computationally feasible. Simulations are made using steady microgravity, synthetic and real g-jitter data taken during a space flight. Findings - Numerical results show that g-jitter drives a complex, 3D, time dependent thermal convection and that velocity spikes in response to real g-jitter disturbances in space flights, resulting in irregular solute concentration distributions. An applied magnetic field provides an effective means to suppress the deleterious convection effects caused by g-jitter. Based on the simulations with applied magnetic fields of various strengths and orientations, the magnetic field aligned with the thermal gradient provides an optimal damping effect, and the stronger magnetic field is more effective in suppressing the g-jitter induced convection. While the convective flows and solute transport are complex and truly 3D, those in the symmetry plane parallel to the direction of g-jitter are essentially two-dimensional (2D), which may be approximated well by the widely used 2D models. Originality/value - The physics-based re-numbering algorithm has made possible the large scale finite element computations for 3D g-jitter flows in a magnetic field. The results indicate that an applied magnetic field can be effective in suppressing the g-jitter driven flows and thus enhance the quality of crystals grown in space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615530510625138
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    LFRFamides: a novel family of parasitation-induced -RFamide neuropeptides that inhibit the activity of neuroendocrine cells in Lymnaea stagnalis (2005)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 92 (2005), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We report the characterization of a cDNA encoding a novel -RFamide neuropeptide precursor that is up-regulated during parasitation in the snail Lymnaea stagnalis. Processing of this precursor yields five structurally related neuropeptides, all but one ending with the C-terminal sequence -LFRFamide, as was confirmed by direct mass spectrometry of brain tissue. The LFRFamide gene is expressed in a small cluster of neurons in each buccal ganglion, three small clusters in each cerebral ganglion, and one cluster in each lateral lobe of the cerebral ganglia. Application of two of the LFRFamide peptides to neuroendocrine cells that control either growth and metabolism or reproduction induced similar hyperpolarizing K+-currents, and inhibited electrical activity. We conclude that up-regulation of inhibitory LFRFamide neuropeptides during parasitation probably reflects an evolutionary adaptation that allows endoparasites to suppress host metabolism and reproduction in order to fully exploit host energy recourses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.2004.02927.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Photoprovocation in the Patients with an EBV Associated Hydroa Vacciniforme-Like Eruption (2005)
    Oxford, UK; Malden, USA : Blackwell Publishing Ltd/Inc.
    Journal of cutaneous pathology 32 (2005), S. 0 
    Details
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: There are many reports of patients with a severe hydroa vacciniforme (HV)-like eruption. The cutaneous lesions occur both in sun-exposed and nonexposed areas in these patients unlike a true HV. In most cases, a latent Epstein-Barr virus (EBV) infection has been detected in the skin lesions of these patients. We performed the photo-provocation test in five patients with an EBV associated HV-like eruption. The photoprovocation tests were caried out using the UVA delivered by a SUPUVASUN 3000 light source. A 5x 5 sqaure cm area on the buttock was irradiated three or four times at 24 hour intervals. A skin biopsy was obtained from the lesional skin and photo-provoked lesion in all five patients. H&E staining and immunohistochemical staining were performed. In situ hybridization was also performed to detect mRNA for EBV in the skin biopsy specimens. Skin lesions were induced by repetitive UVA exposure in all five patients. The severity of the phtoprovoked lesion showed correlation with that of the clinical features. The immunohistologic findings of photo-provoked skin lesions were similar to those of original skin lesions. A latent EBV infection was also demonstrated in the photo-provoked lesion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0303-6987.2005.320at.x
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Avian flu H5N1 virus outbreak in migratory waterfowl (2005)
    [s.l.] : Nature Publishing Group
    Nature 436 (2005), S. 191-192 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The highly pathogenic H5N1 influenza virus has become endemic in poultry in southeast Asia since 2003 and constitutes a major pandemic threat to humans. Here we describe cases of disease caused by H5N1 and transmission of the virus among migratory geese populations in western China. This ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03974
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  • 8
    Electronic Resource
    Electronic Resource
    An Open Architecture Control System for Parallel Kinematic Machines Based on Multi-DSP Parallel Procession (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 392-394 (Oct. 2008), p. 667-671 
    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: Because of the control complexity of the Parallel Kinematic Machines (PKMs), suchmechanisms may suffer from lack of accuracy at high speed. Unfortunately, conventional motioncontrollers have very limited flexibility because they are designed for Cartesian coordinates.Therefore, the motion control system for PKMs with both high performance and open architectureis urgently demanded. In this paper, an open architecture control system for PKMs based onmulti-DSP parallel procession is presented. Then, the hierarchical distributed control strategy isdiscussed in details. In addition, the realization of an interactive communication interface amongDSP processors is presented. According to the testing results, the developed system is capable ofobtaining an interpolation sampling period at least 3 times faster than that could be offered by mostcontrollers based on single-DSP, thus it is available for high-speed and high-accuracy control ofPKMs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.392-394.667.pdf
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