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  • Articles  (317)
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  • 1
    Electronic Resource
    Electronic Resource
    Time step truncation in direct simulation Monte Carlo for semiconductors (2005)
    Bradford : Emerald
    Compel 24 (2005), S. 1351-1366 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Purpose - To provide an accurate analysis of the systematic error introduced by the constant time technique free flight mechanism, due to the choice of the time step and number particles. Design/methodology/approach - A homogeneous (bulk) silicon semiconductor is studied by using direct simulation Monte Carlo (DSMC). Findings - The systematic error turns out to be of the first order with respect to the time step. The efficiency of the method is tackled. Research limitations/implications - The analysis is limited to the bulk case. Future researches will consider non homogeneous devices Originality/value - An accurate analysis of an "old" free flight mechanism has been performed, and its limits have been stated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640510615652
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  • 2
    Electronic Resource
    Electronic Resource
    Refractive index and density isotherms for methane from 273 to 373 K and at pressures up to 34 MPa (1992)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 37 (1992), S. 414-418 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je00008a010
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  • 3
    Electronic Resource
    Electronic Resource
    GM Foods and the Misperception of Risk Perception (2004)
    350 Main Street , Malden , MA 02148 , USA , and 9600 Garsington Road , Oxford OX4 2DQ , UK . : Blackwell Publishing, Inc.
    Risk analysis 24 (2004), S. 0 
    Details
    ISSN: 1539-6924
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Public opposition to genetically modified (GM) food and crops is widely interpreted as the result of the public's misperception of the risks. With scientific assessment pointing to no unique risks from GM crops and foods, a strategy of accurate risk communication from trusted sources has been advocated. This is based on the assumption that the benefits of GM crops and foods are self-evident. Informed by the interpretation of some qualitative interviews with lay people, we use data from the Eurobarometer survey on biotechnology to explore the hypothesis that it is not so much the perception of risks as the absence of benefits that is the basis of the widespread rejection of GM foods and crops by the European public. Some respondents perceive both risks and benefits, and may be trading off these attributes along the lines of a rational choice model. However, for others, one attribute—benefit—appears to dominate their judgments: the lexicographic heuristic. For these respondents, their perception of risk is of limited importance in the formation of attitudes toward GM food and crops. The implication is that the absence of perceived benefits from GM foods and crops calls into question the relevance of risk communication strategies for bringing about change in public opinion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0272-4332.2004.00421.x
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  • 4
    Electronic Resource
    Electronic Resource
    Low levels of Ypt protein prenylation cause vesicle polarization defects and thermosensitive growth that can be suppressed by genes involved in cell wall maintenance (2000)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 35 (2000), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The Rab/Ypt small G proteins are essential for intracellular vesicle trafficking in mammals and yeast. The vesicle-docking process requires that Ypt proteins are located in the vesicle membrane. C-terminal geranylgeranyl anchors mediate the membrane attachment of these proteins. The Rab escort protein (REP) is essential for the recognition of Rab/Ypt small G proteins by geranylgeranyltransferase II (GGTase II) and for their delivery to acceptor membranes. What effect an alteration in the levels of prenylated Rab/Ypt proteins has on vesicle transport or other cellular processes is so far unknown. Here, we report the characterization of a yeast REP mutant, mrs6-2, in which reduced prenylation of Ypt proteins occurs even at the permissive temperature. A shift to the restrictive temperature does not alter exponential growth during the first 3 h. The amount of Sec4p, but not Ypt1p, bound to vesicle membranes is reduced 2.5 h after the shift compared with wild-type or mrs6-2 cells incubated at 25°C. In addition, vesicles fail to be polarized towards the bud and small budded binucleate cells accumulate at this time point. Growth in 1 M sorbitol or overexpression of MLC1, encoding a myosin light chain able to bind the unconventional type V myosin Myo2, or of genes involved in cell wall maintenance, such as SLG1, GFA1 and LRE1, suppresses mrs6-2 thermosensitivity. Our data suggest that, at least at high temperature, a critical minimal level of Ypt protein prenylation is required for maintaining vesicle polarization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.2000.01782.x
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  • 5
    Electronic Resource
    Electronic Resource
    Biotechnology and the European public (2000)
    [s.l.] : Nature America Inc.
    Nature biotechnology 18 (2000), S. 935-938 
    Details
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] Data from the fourth Eurobarometer survey carried out in November 1999 suggest that Europeans have become increasingly opposed to genetically modified (GM) foods, but remain supportive of medical and environmental applications of biotechnology. In general, where the public perceives genuine ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/79403
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  • 6
    Electronic Resource
    Electronic Resource
    Production and characterization of nitrided CVD-SiC films (1997)
    Springer
    Microchimica acta 125 (1997), S. 293-296 
    Details
    ISSN: 1436-5073
    Keywords: silicon nitride ; thermal nitridation ; SiC ; GDOS ; XPS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Silicon Carbide (SiC) and SiC with free silicon [SiC(Si)] thin films were prepared by chemical vapor deposition (CVD) using a CH3SiCl3-H2-Ar gas mixture at a temperature of 1223 K. Afterwards these layers were gas nitrided in an ammonia-hydrogen-argon mixture at 1273 K. The solid product is an extremely thin film of silicon nitride on SiC or SiC(Si)-basic layers. These ultra thin silicon nitride films were investigated by glow discharge optical spectroscopy (GDOS) and x-ray photoelectron spectroscopy (XPS). The thickness of the layers was determined to a maximum value of 30 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01246200
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  • 7
    Electronic Resource
    Electronic Resource
    Borel-summability of the high temperature expansion for classical continuous systems (1981)
    Springer
    Communications in mathematical physics 82 (1981), S. 183-189 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract It is shown that for classical gases with stable, bounded and absolutely integrable pair interactions, the Taylor expansions in β of the correlation functions and the pressure are Borel-summable at β=0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02099915
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  • 8
    Electronic Resource
    Electronic Resource
    The Limiting Kinetic Equation of the Consistent Boltzmann Algorithm for Dense Gases (2000)
    Springer
    Journal of statistical physics 101 (2000), S. 1065-1086 
    Details
    ISSN: 1572-9613
    Keywords: kinetic theory ; Enskog equation ; direct simulation Monte Carlo ; Boltzmann equation ; consistent Boltzmann Algorithm ; dense gases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper establishes a theoretical foundation for the Consistent Boltzmann Algorithm (CBA) by deriving the limiting kinetic equation. The formulation is similar to the proof by one of the authors that the Boltzmann equation is the limiting kinetic equation for Direct Simulation Monte Carlo [W. Wagner, J. Statist. Phys. 66:1011 (1992)]. For a simplified model distilled from CBA, the limiting equation is solved numerically, and very good agreement with the predictions of the theory is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026429722169
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  • 9
    Electronic Resource
    Electronic Resource
    A convergence proof for Bird's direct simulation Monte Carlo method for the Boltzmann equation (1992)
    Springer
    Journal of statistical physics 66 (1992), S. 1011-1044 
    Details
    ISSN: 1572-9613
    Keywords: Boltzmann equation ; Bird's direct simulation Monte Carlo method ; stochastic numerical algorithm ; convergence of random measures ; Markov jump processes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Bird's direct simulation Monte Carlo method for the Boltzmann equation is considered. The limit (as the number of particles tends to infinity) of the random empirical measures associated with the Bird algorithm is shown to be a deterministic measure-valued function satisfying an equation close (in a certain sense) to the Boltzmann equation. A Markov jump process is introduced, which is related to Bird's collision simulation procedure via a random time transformation. Convergence is established for the Markov process and the random time transformation. These results, together with some general properties concerning the convergence of random measures, make it possible to characterize the limiting behavior of the Bird algorithm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01055714
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  • 10
    Electronic Resource
    Electronic Resource
    Approximation of the Boltzmann equation by discrete velocity models (1995)
    Springer
    Journal of statistical physics 78 (1995), S. 1555-1570 
    Details
    ISSN: 1572-9613
    Keywords: Boltzmann equation ; discrete velocity models ; weak convergence ; random mass flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two convergence results related to the approximation of the Boltzmann equation by discrete velocity models are presented. First we construct a sequence of deterministic discrete velocity models and prove convergence (as the number of discrete velocities tends to infinity) of their solutions to the solution of a spatially homogeneous Boltzmann equation. Second we introduce a sequence of Markov jump processes (interpreted as random discrete velocity models) and prove convergence (as the intensity of jumps tends to infinity) of these processes to the solution of a deterministic discrete velocity model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02180142
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