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  • Elsevier  (41)
  • Wiley-Blackwell  (8)
  • Oxford University Press  (6)
  • Nature Publishing Group  (4)
  • American Association for the Advancement of Science  (3)
  • American Institute of Physics (AIP)  (2)
  • American Chemical Society (ACS)
  • 1990-1994  (64)
  • 1993  (64)
  • 1
    Electronic Resource
    Electronic Resource
    Scanning tunneling microscope data acquisition and control in visual basic (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3530-3533 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A general purpose data acquisition and control system for scanning tunneling microscopy (STM) using Visual Basic is presented. This Windows hosted Visual Basic environment is highly desirable for use in STM image manipulation, storage, and printing, but in its standard form is not suitable for most data acquisition and display applications. Many of the inherent limitations in the Visual Basic language have been overcome by the use of direct calls to the Windows Application Program Interface. In this paper, we describe a general Visual Basic STM user interface and control system, and the extensions to the language using the Windows API needed to implement this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144278
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  • 2
    Electronic Resource
    Electronic Resource
    Particle transport studies for single-null divertor discharges in DIII-D (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 2165-2175 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper an investigation of the particle confinement for beam-heated single-null discharges in the open divertor configuration of Doublet III-D (DIII-D) [E. J. Doyle et al., Phys. Fluids B 3, 2300 (1991)] is described. Results are based on a Monte Carlo neutral transport model with a relatively simple plasma model that utilizes experimental data on density, temperature, and heat flux profiles in the edge plasma. For a typical discharge, it is found that the particle confinement time in the quiescent H-mode phase is only about a factor of 2 larger than during the L-mode phase, an increase comparable to the energy confinement time increase. For both H-mode and L-mode phases the particle confinement time is about a factor of 4 larger than the energy confinement time. It is also found that the core plasma fueling rate is higher in the H mode due to the increased transparency of a thinner scrape-off layer. The longer particle confinement time and the increased fueling rate both contribute to the observed density rise during the quiescent period following the L–H transition. Flux surface-averaged transport modeling of the time evolution for the core plasma density profile during H mode suggests that a strong inward particle pinch is necessary near the separatrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860751
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  • 3
    Electronic Resource
    Electronic Resource
    Mr Science, warts and all (1993)
    [s.l.] : Nature Publishing Group
    Nature 361 (1993), S. 413-413 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ONE of this century's great teachers and novelists, H. G. Wells was blessed with superabundant energies - was, indeed, a driven person. As the classic self-made man who worshipped his maker, he possessed omnivorous appetites and pursued astonishingly broad interests. In women and affairs of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/361413a0
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  • 4
    Electronic Resource
    Electronic Resource
    The fairer science (1993)
    [s.l.] : Nature Publishing Group
    Nature 366 (1993), S. 387-387 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE rise of modern science meant the discrediting of the old human-centred subjective cosmos beloved of mediaeval people, which attributed soul and feelings to everything. Its gushing, poetic anthropomorphism was replaced by a world-view that was severely objective: nature was just ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/366387a0
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  • 5
    Electronic Resource
    Electronic Resource
    Body mass dependence of H + leak in mitochondria and its relevance to metabolic rate (1993)
    [s.l.] : Nature Publishing Group
    Nature 362 (1993), S. 628-630 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The leaking of protons by diffusion across the mitochondrial inner membrane can explain the less than perfect coupling of oxygen consumption to ATP synthesis13 l6. The kinetics of proton leak are measured by titration of the respiration rate and membrane potential with an inhibitor ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/362628a0
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  • 6
    Electronic Resource
    Electronic Resource
    Worse than the malady (1993)
    [s.l.] : Nature Publishing Group
    Nature 366 (1993), S. 119-120 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WE have had many gung-ho histories of colonial medicine, and it's sometimes argued today that medical progress forms the chief, if perhaps the only, enduring justification of imperialism. But a revisionist reading has arisen, contending that tropical medicine itself was just an arm of imperial ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/366119a0
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  • 7
    Electronic Resource
    Electronic Resource
    Trapping efficiencies of various collection solvents after supercritical fluid extraction (1993)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 16 (1993), S. 713-716 
    Details
    ISSN: 0935-6304
    Keywords: SFE ; Supercritical carbon dioxide ; Sand ; Test mixture ; Solvent trapping ; Solvent mixtures ; Trapping efficiency ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A polarity test mix consisting of acetophenone, N, N-dimethylaniline, naphthalene, decanoic acid, 2-naphthol, and n-tetracosane was spiked onto sand, and extracted with supercritical carbon dioxide, to evaluate the collection efficiency of various solvents and solvent mixtures. Nine single collection solvent systems and four mixed collection solvent systems were studied. When one-component collection solvents were employed, quantitative (above 90%) recovery of all analytes was not possible. With mixed collection solvents, recoveries of 90% or better with all analytes studied were possible.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240161208
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  • 8
    Electronic Resource
    Electronic Resource
    A macromolecular deformation model to estimate viscoelastic flow effects in polymer melts (1993)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 33 (1993), S. 437-444 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The elastic deformation of polymer macromolecules in a shear field is used as the basis for quantitative predictions of viscoelastic flow effects in a polymer melt. Non-Newtonian viscosity, capillary end correction factor, maximum die swell, and die swell profile of a polymer melt are predicted by the model. All these effects can be reduced to generic master curves, which are independent of polymer type. Macromolecular deformation also influences the brittle failure strength of a processed polymer glass. The model gives simple and accurate estimates of practically important processing effects, and uses fitting parameters with the clear physical identity of viscoelastic constants, which follow well established trends with respect to changes in polymer composition or processing conditions.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760330710
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  • 9
    Electronic Resource
    Electronic Resource
    Miscible blends of modified poly(aryl ether ketones) with aromatic polyimides (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 821-830 
    Details
    ISSN: 0887-6266
    Keywords: blends of modified PEEK with aromatic polyimides ; miscibility of blends of modified PEEK with aromatic polyimides ; Spectra, IR and UV, of blends of modified PEEK with aromatic polyimides ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The phase behavior of binary blends of poly(ether ether ketone) (PEEK), sulfonated PEEK, and sulfamidated PEEK with aromatic polyimides is reported. PEEK was determined to be immiscible with a poly(amide imide) (TORLON 4000T). Blends of sulfonated and sulfamidated PEEK with this poly(amide imide), however, are reported here to be miscible in all proportions. Blends of sulfonated PEEK and a poly(ether imide) (ULTEM 1000) are also reported to be miscible. Spectroscopic investigations of the intermolecular interactions suggest that formation of electron donoracceptor complexes between the sulfonated/sulfamidated phenylene rings of the PEEKs and the n-phenylene units of the polyimides are responsible for this miscibility. © 1993 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090310710
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  • 10
    Electronic Resource
    Electronic Resource
    Melting behavior of poly(ether ether ketone) in its blends with poly(ether imide) (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 1845-1850 
    Details
    ISSN: 0887-6266
    Keywords: melting behavior of PEEK/PEI blends ; equilibrium melting point ; crystal reorganization ; interlamellar segregation ; melting point depression ; interaction parameter ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We detail the melting behavior of poly(ether ether ketone) (PEEK) and investigate its melting behavior in miscible blends with poly(ether imide) (PEI). The determination of the equilibrium melting point (Tm0) of PEEK is discussed by considering its inhomogeneous morphology. Tm0 is obtained by a long extrapolation of a Hoffman-Weeks plot to 384°C. Hindrance of PEEK crystal reorganization induced by PEI during heating is observed over the blend composition investigated (20-75 wt % PEEK). This behavior is correlated with the incorporation of PEI in the interlamellar zones of PEEK crystals. The interaction parameter χ of PEEK/PEI blends is estimated by the equilibrium melting point depression. This gives the interaction density B = -1.2 cal/cm3, and x = -0.40 at 400°C. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090311217
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