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  • 1
    Electronic Resource
    Electronic Resource
    Deposition of aluminum thin films by photochemical surface reaction (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3268-3274 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Aluminum thin films have been deposited from dimethylaluminum hydride (DMAlH) on silicon substrates illuminated with a deuterium lamp or an ArF laser. DMAlH was found to be useful as a new source gas for photodeposition of aluminum films at a low carbon level if it was used with photons with wavelengths below 200 nm. Illumination is effective not only to produce films at a substrate temperature lower than required by thermal decomposition, but also to reduce the electrical resistivity of the deposited films. To emphasize surface, rather than gas-phase, reactions, the vapor pressure in a reaction cell was lowered (typically at 6.7×10−3 Pa). Evidence for the photochemical surface reaction has been provided by area selectivity and the time needed to renew the adlayer on the surface. In spite of low vapor pressure, the deposition rate was typically 19 nm/min for the lamp and 0.06 nm/pulse for the laser at a substrate temperature of 200 °C. A rate equation, which included both photodissociation and photoinduced desorption, accounted for the observed dependence of deposition rate on substrate temperature, light intensity, vapor pressure, and laser pulse repetition rate. The role of secondary reactions that follow initial photodissociation was discussed briefly. The electrical resistivity for the film produced at 270 °C under illumination was 6.2 μΩ cm, while a much higher resistivity of 140 μΩ cm was observed for a thermally grown film. The carbon level was low (2–3%) in agreement with the low film resistivity. The surface was rough, leaving room for improvement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344119
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  • 2
    Electronic Resource
    Electronic Resource
    Erratum: "Deposition of aluminum thin films by photochemical surface reaction'' [J. Appl. Phys. 66, 3268 (1989)] (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 3208-3208 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345378
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  • 3
    Electronic Resource
    Electronic Resource
    CARDIOVASCULAR ALTERATIONS BY CHRONIC INTERMITTENT HYPOXIA: IMPORTANCE OF CAROTID BODY CHEMOREFLEXES (2005)
    Oxford, UK : Blackwell Science, Ltd
    Clinical and experimental pharmacology and physiology 32 (2005), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. Humans experiencing intermittent hypoxia (IH) owing to recurrent apnoea syndromes exhibit serious cardiovascular morbidity, including high blood pressure, increased sympathetic nerve activity, cardiac arrhythmia and myocardial infarction. Although apnoeas are accompanied by a simultaneous decrease in arterial O2 (hypoxia) and an increase in CO2 (hypercapnia), studies on experimental animals suggest that hypoxia, rather than hypercapnia, is the primary stimulus for developing hypertension and enhanced sympathetic nerve activity. Enhanced hypoxic-sensing ability of the carotid bodies and the ensuing reflex activation of the sympathetic nervous system have been suggested to play a critical role in cardiorespiratory alterations resulting from recurrent apnoeas.2. The purpose of the present review is to highlight recent studies demonstrating the effects of IH on carotid body sensory activity and its consequences on sympathetic activation in a rodent model of chronic IH. Adult rats exposed to chronic IH (15 s of 5% O2 followed by 5 min of 21% O2, nine episodes per h, 8 h/day for 10 days) exhibited selective enhancement of carotid body sensory response to hypoxia. In addition, chronic IH induced a novel form of sensory plasticity in the carotid body, manifested as sensory long-term facilitation (LTF). Functional changes in the carotid body occurred in the absence of morphological changes in the chemoreceptor tissue.3. Acute hypoxia increased expiratory modulated splanchnic nerve activity (SNA) and acute IH-induced LTF in SNA. Hypoxia-induced SNA activation was prevented by bilateral sectioning of the sinus nerves. Rats exposed to chronic IH exhibited enhanced hypoxia-induced sympathetic activation and augmented LTF of the SNA. Bilateral sectioning of the sinus nerves abolished these responses, suggesting chronic IH-induced alterations in carotid body sensitivity contribute to LTF in SNA and the subsequent cardiovascular alterations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.2005.04209.x
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  • 4
    Electronic Resource
    Electronic Resource
    Bis(1-acetonylpyridinium) pyridinium hexaiodobismuth(III) (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. e183-e184 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The crystal structure of the title complex, (C8H10N)2(C5H6N)[BiI6], contains discrete [BiI6]3− anions, and (HNC5H5)+ and (CH3COCH2NC5H5)+ cations separated by normal van der Waals contacts. The [BiI6]3− anion has the Bi atom on an inversion centre. The (HNC5H5)+ cation also lies about an inversion centre and is disordered. The (CH3COCH2NC5H5)+ cation lies in a general position.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100005230
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  • 5
    Electronic Resource
    Electronic Resource
    Investigation of the Flange Earring of Deep-Drawing Aluminum Sheets by Rate-Independent Polycrystalline Plasticity Finite Element Analysis (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 274-276 (Oct. 2004), p. 559-564 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.274-276.559.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    A resetting signal between Drosophila pacemakers synchronizes morning and evening activity (2005)
    [s.l.] : Nature Publishing Group
    Nature 438 (2005), S. 238-242 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The biochemical machinery that underlies circadian rhythms is conserved among animal species and drives self-sustained molecular oscillations and functions, even within individual asynchronous tissue-culture cells. Yet the rhythm-generating neural centres of higher eukaryotes are usually ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04192
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  • 7
    Electronic Resource
    Electronic Resource
    Coupled oscillators control morning and evening locomotor behaviour of Drosophila (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 431 (2004), S. 862-868 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Daily rhythms of physiology and behaviour are precisely timed by an endogenous circadian clock. These include separate bouts of morning and evening activity, characteristic of Drosophila melanogaster and many other taxa, including mammals. Whereas multiple oscillators have long been proposed to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02926
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  • 8
    Electronic Resource
    Electronic Resource
    Study on Metal Forming by Macro-Micro Combine Numerical Analysis (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 671-676 
    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: It has long been found that the crystal orientations would induce macroscopic anisotropyduring deformation process, and then affect the deformation properties of sheet metal. So it is veryimportant to find the true relation between texture distribution and macroscopic anisotropy. In thispaper, the anisotropy coefficients of the yield function are fitted by Taylor factor and crystal plasticmodel. Metal flow is assumed to occur by crystallographic slip on given slip systems within eachcrystal. Then this simulation results are compared with those of microscopic crystal plastic method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.671.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Solid Shell Element and its Application in Roll Forming Simulation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 347-352 
    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: Solid shell element models which possess only translational degrees of freedom and areapplicable to thin structure analyses has drawn much attention in recent years and presented goodprospect in sheet metal forming. In this study, a solid shell element model is introduced into thedynamic explicit elastic-plastic finite element method. The plane stress constitutive relation isassumed to relieve the thickness locking and the selected reduced integration method is used toovercome volumetric locking. The assumed natural strain method is adopted to resolve shearlocking and trapezoidal locking problem. Two benchmark examples and a stage of roll formingprocess are calculated, and the calculating results are compared with those by solid element model,which demonstrates the effectiveness of the element
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.347.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Warm Deep Drawing of AZ31 Magnesium Alloy Sheet with Variable Blank Holder Force (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 639-644 
    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: Blank holder force (BHF) plays an important role in sheet metal forming. Previousstudies demonstrated that variable blank holder forces can improve the cold formability ofsteel blank, but the research on the application of variable blank holder force in warm formingof magnesium sheet forming has not been well investigated. In this study, the mechanicalproperty of AZ31 magnesium alloy sheet is measured through some uniaxial tensile tests. Inorder to obtain the variational rule of the BHF, a mathematical model of BHF is deducedbased on the energy theory. The variational rule of the BHF over the punch stroke is analyzed.Finally, three profiles of the BHF curve are designed, and the numerical simulation of warmdeep drawing process of magnesium alloy sheet is also performed. A suitable variable blankholder force scheme is obtained through comparison among three results of simulation. Thesimulation indicates that the limiting drawing ratio of AZ31 magnesium alloy sheet can beimproved from 3.0 to 3.5 with the suitable blank holder force varied by an inverted V curve
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.639.pdf
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