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  • Electronic Resource  (11)
  • 1
    Electronic Resource
    Electronic Resource
    The transient Flory model and its application to catalytic polymerization. 1 (1984)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 88 (1984), S. 2270-2275 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150655a018
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  • 2
    Electronic Resource
    Electronic Resource
    Two-dimensional reactive systems: Rapid bimolecular processes on spherical surfaces (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 2727-2731 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Most of the approaches to surface kinetics assume an infinite two-dimensional plane. Although this condition can be met experimentally, in most of the practical cases the surface is usually in the form of small particles or spheres to maximize the total surface area. Here, we extend our previous two-dimensional results to dimerization where the reactants are constrained to move on a spherical particle. Using a statistical nonequilibrium thermodynamic approach, we find that under certain conditions the curvature of the sphere is an important parameter which significantly affects the rate coefficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460924
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  • 3
    Electronic Resource
    Electronic Resource
    Organic chemicals from the Chihuahuan Desert (1980)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 28 (1980), S. 171-183 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60228a022
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  • 4
    Electronic Resource
    Electronic Resource
    The transient Flory model and its application to catalytic polymerization. 2 (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 1725-1732 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100399a052
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  • 5
    Electronic Resource
    Electronic Resource
    One-dimensional reactive systems: The effect of diffusion on rapid bimolecular processes (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 1997-2003 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Bimolecular reactions in one dimension are studied using the fluctuation–dissipation theory. In particular, we calculate the rate constants for three reactive systems. First, for an infinite straight line, we consider the reaction A+A→A+P, and the isomerization 2A→A2. In the first case, we obtain a linear dependence between rate constant and the reactant concentration. In the second, we obtain the same linear dependence only when the characteristic dimerization time τd is much greater than the characteristic pumping time τp. On the other hand if τp(very-much-greater-than)τd, we find a rate constant which is independent of the reactant concentration. Our results are in qualitative agreement with recent computer simulations of these reactions. Second, we consider trapping, A+S→S, by static sinks on a ring. For the cases of interest, we find negligible corrections, due to curvature, to the functional form of the infinite straight line rate constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454735
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  • 6
    Electronic Resource
    Electronic Resource
    Turing patterns in a self-replicating mechanism with a self-complementary template (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 2003-2006 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A variety of nonlinear chemical models, such as the Selkov–Schnakenberg, exhibit Turing patterns. The Templator, which is based on a minimal autocatalytic monomer–dimer system, is a newer two-variable model also able to show Turing patterns. Here we find that the dynamic behavior of the Templator is quite similar to other models with cubic nonlinearities. This is demonstrated through a series of computer simulations in two dimensions utilizing the cellular automata approach. The selection of parameter values is based on linear stability analysis, which provides a relatively simple method of predicting Turing pattern formation. The simulations reveal spot, labyrinth, and striped patterns, in agreement with the predictions of the analysis. Other behaviors, such as honeycomb patterns, are also observed. For some parameter values, we study transient spot replication. Our findings strongly suggest that the Templator may belong to the same class of models previously studied by Pearson. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.482006
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of a cultural change in a Spanish telecommunications firm (2000)
    Bradford : Emerald
    Business process management journal 6 (2000), S. 342-358 
    Details
    ISSN: 1355-2503
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: This paper analyzes the efforts made by the Telefonica Group (the main Spanish firm in the telecommunications sector) to evolve from a bureaucratic culture to another oriented towards total quality and the customer. The need for this change came as a result of the liberalization in the telecommunications sector in the early 1990s. Through an analysis of the internal documents generated in the process, and also by means of several interviews with executives and consultants who took part in the design and introduction of the change mentioned above, we study the validity and effectiveness of the steps taken. The methodology used by the firm was based on the "bubble-like" (from one division to the whole organization) and "cascade-like" (from the top management to the lowest levels) implementation systems, based on the support of strong training, communications and participation programmes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/14637150010345514
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  • 8
    Electronic Resource
    Electronic Resource
    Chemical Oscillations in Enzyme Kinetics (1996)
    Springer
    The chemical educator 1 (1996), S. 1-17 
    Details
    ISSN: 1430-4171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The Higgins model is a two variable model in enzyme kinetics. In contrast with other popular simple dynamical models like the Lotka-Volterra model, the Higgins model shows steady states, damped oscillations and stable limit cycles. For these three dynamical behaviors, stability analysis yields expressions of the eigenvalues, which are easy to obtain either analytically or with the use of Mathematica. With these expressions we can find the boundaries between the three dynamical regions in parameter space and the bifurcation point. Also, we have compared the Higgins model with the other two variable models and find that the origin of the richer dynamical behavior of the Higgins model is due to the enzymatic step in the mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00897960035a
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  • 9
    Electronic Resource
    Electronic Resource
    Percutaneous management of abdominal abscesses with GI tract fistulous communication: Report of 2 cases (1984)
    Springer
    Abdominal imaging 9 (1984), S. 65-68 
    Details
    ISSN: 1432-0509
    Keywords: Abdominal abscesses ; Percutaneous drainage ; Gastrointestinal fistulae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Percutaneous drainage of abdominal abscesses is an alternative to surgical treatment. Two cases of abscesses with fistulous communication to the GI tract, percutaneously drained successfully, are presented. Reevaluation of these and other relative contraindications of this technique are reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01887804
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  • 10
    Electronic Resource
    Electronic Resource
    Introduction to Chemical Oscillations Using a Modified Lotka Model (2000)
    Springer
    The chemical educator 5 (2000), S. 216-222 
    Details
    ISSN: 1430-4171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In teaching chemical kinetics most textbooks use the Lotka-Volterra Model to introduce the concept of chemical oscillations. Unfortunately, the Lotka-Volterra Model yields neutrally stable limit cycles for any initial conditions, which is a nonphysical property not observed in chemical kinetics. A more physical, two-variable model with simple linear stability analysis is, therefore, desirable. Here, we consider a Modified Lotka-Volterra Model that shows multiple physical steady states and both damped and stable oscillations. We can also study a stable node bifurcation to a saddle point and a stable node bifurcation to a stable limit cycle. This dynamically richer model can be analyzed through a simple linear stability analysis and numerical integration of the system of ordinary differential equations. Both methods, in particular the analytical analysis, are accessible to undergraduate students.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00897000413a
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