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  • 1
    Electronic Resource
    Electronic Resource
    2 1S excitation of helium: A precise distorted wave approach (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 1818-1822 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The differential and total cross sections are evaluated for 1 1S–2 1S excitation of helium atom by electron impact in distorted wave approximation. The effect of the distortion of incident electron, contribution due to polarization of target and the exchange effect are appropriately taken in both the initial and final channels. Fourier decomposition of interaction potential between the projectile and target is taken and an accurate form factor has been used to calculate the transition matrix. The present results are compared with various distorted wave models as well as other theoretical and experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448365
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  • 2
    Electronic Resource
    Electronic Resource
    Expert systems in production and operations management: Current applications and future prospects (1996)
    Bingley : Emerald
    International journal of operations & production management 16 (1996), S. 27-44 
    Details
    ISSN: 0144-3577
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Defines an expert system (ES) as a decision-making tool that captures perishable expertise from an expert and stores this knowledge in the computer, and also as a computer system that can solve problems using human expertise and knowledge of the system environment. Notes that expert systems have found many applications in the area of production and operations management (POM). Explains the key role of the ES as a management tool to enhance productivity, improve quality, increase profits and capture expertise in many business settings. Highlights that the field of POM has a heavy orientation towards problem solving and decision making, hence it is a very fertile area for application for ES. Evaluates the current use of ES in POM and discusses future prospects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/01443579610151742
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of relationalism and readiness on EDI collaboration and outcomes (1999)
    Bradford : Emerald
    The @journal of business & industrial marketing 14 (1999), S. 390-402 
    Details
    ISSN: 0885-8624
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Though the popular business press and many EDI industry practitioners have repeatedly heralded the explosive growth of EDI, the diffusion of this technology has never reached predicted levels. Seeks to fill this gap in the EDI literature by investigating how two variables (relational norms and readiness to do EDI) affect the EDI initiating firm's implementation strategy and how these variables and strategy affect EDI performance. Develops testable hypotheses. Indicates the measures constructed to test the hypotheses empirically in a sample survey of EDI-knowledgeable informants. Shows that when greater relationalism is present between the firms more collaborative (i.e. supportive) implementation strategies are used. Suggests that collaborative strategies and readiness to do EDI lead to better outcomes. Discusses the managerial implications of these findings and future research opportunities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/08858629910290175
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Practical Approximations of the Well Function (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 36 (1998), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Computation of the well function is required in the analysis of pumping test data for leaky or confined aquifers. Existing electronic dataloggers facilitate collection of hydraulic test data, which is commonly interpreted using computer programs. Approximate expressions have recently been proposed to compute the well function over the entire range of argument values. We propose approximations that, while providing reasonable accuracy, are less computationally intensive than previous approximations. A detailed comparative analysis of the execution times and the errors of these approximations is performed. The proposed expressions are generally accurate to within 1%, and result in a savings of computation time on the order of 15 to 87% for confined aquifers, and 29 to 76% for leaky aquifers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1998.tb02203.x
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  • 5
    Electronic Resource
    Electronic Resource
    A Numerical Model for Water Flow and Chemical Transport in Variably Saturated Porous Media (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 31 (1993), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: A two-dimensional numerical model is developed for the simulation of water flow and chemical transport through variably saturated porous media. The nonlinear flow equation is solved using the Calerkin finite-element technique with either the Picard or the Newton iteration scheme. A continuous velocity field is obtained by separate application of the Galerkin technique to the Darcy's equation. A two-site adsorption-desorption model with a first-order loss term is used to describe the chemical behavior of the reactive solute. The advective part of the transport equation is solved with one-step backward particle tracking while the dispersive part is solved by the regular Galerkin finite-element technique. A precondi tioned conjugate gradient-like method is used for the iterative solution of the systems of linear simultaneous equations to save on computer memory and execution time. The model is applied to a few flow and transport problems, and the numerical results are compared with observed and analytic values. The model is found to duplicate the analytic and observed values quite well, even near very sharp fronts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1993.tb00597.x
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  • 6
    Electronic Resource
    Electronic Resource
    PRODUCT STRUCTURE COMPLEXITY AND MULTILEVEL LOT SIZING USING ALTERNATIVE COSTING POLICIES (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 16 (1985), S. 0 
    Details
    ISSN: 1540-5915
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: This research evaluates the effect of product structure complexity on the performance of several lot-sizing procedures in a multilevel manufacturing environment. The experiment compares two different costing policies, full value added (FVA) and marginal value added (MVA), for calculating inventory holding cost. The major finding of the research is that product structure complexity has very little effect on the performance of various lot-sizing procedures. A second finding is that when product structures with varying components per parent and stocking points for a particular end item are present, the MVA costing policy emerges as the policy of choice because it favors slightly the Silver-Meal (SM)/least-total-cost (LTC) procedures over the Wagner-Whitin (WW)/LTC procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-5915.1985.tb01488.x
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  • 7
    Electronic Resource
    Electronic Resource
    Excitation of helium by positron: A distorted wave polarized orbital approach (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 4715-4717 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The differential and total cross sections for the 1 1S–2 1S excitation of helium by positron in the energy range 22–200 eV are calculated using a distorted wave polarized orbital approach. The results are compared with other available theoretical and experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450001
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of Hydraulic Conductivity Averaging Schemes for One-Dimensional, Steady-State Unsaturated Flow (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 33 (1995), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The evaluation of average properties over a block or element is required for most numerical methods used for the solution of unsaturated flow equations. In this study, it is shown that the accuracy of a particular averaging scheme depends on the type of model used for unsaturated material properties. A systematic and thorough error analysis of the averaging techniques for some commonly used soil characteristic curves is performed. It is shown that the two-point Gaussian quadrature is consistently more accurate than the arithmetic, geometric, and harmonic means for all types of constitutive models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1995.tb00040.x
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of Slope-Matching Methods for Aquifer Parameter Determination (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 32 (1994), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Various methods for numerical determination of aquifer transmissivity and storage coefficients from a single observation well data have recently been proposed. Most of these methods involve reading the slope values from a table or providing an initial estimate for iterative solution. A different formulation of the slope-matching technique has been suggested in the field of petroleum engineering which obtains the parameter values without using any tables or iterative procedures. In this study we adopt a similar approach and compare the prediction of various techniques. The modification of the approach to include cases with time-varying parameters is examined. Numerical experiments are performed first on synthetic data to ascertain the relative accuracy of different slope evaluation techniques. It is shown that the slope of the drawdown with respect to the logarithm of time results in the most accurate prediction of aquifer parameters. The inaccuracy involved in application of the slope-matching methods to cases involving time-varying parameters is analyzed. The methods are then applied to some field data and the results are compared with published data. AH the methods are found to work reasonably well for the field application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1994.tb00892.x
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  • 10
    Electronic Resource
    Electronic Resource
    Numerical Simulation of the Wicking Effect in Liner Systems (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 32 (1994), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Numerical simulations were carried out to investigate the capillary barrier effect and the wicking ability of multilayer earth liner systems. Two specific cases were studied: a two-layer liner composed of a fine- over a coarse-textured material, and a three-layer liner composed of a medium-textured material in between a fine- and a coarse-textured material. Results of the simulations show that a quadratic relationship exists between the thickness of the fine-textured material and the arrival time of the wetting front to the interface. At the time the wetting front reaches the interface, the width of the lateral spreading within the fine material is smaller than the thickness of this material. The lateral spreading and thickness are linearly related. The wicking ability of the different materials is more significant under relatively smaller infiltration rates and is controlled by the magnitude of the hydraulic diffusivity. For the two-layer liner the criteria of minimizing the vertical movement and maximizing the wicking effect within the fine-textured material conflict. A three-layer liner satisfies both of these criteria. The results for the three-layer system show that the medium-textured material has more superior wicking properties than the fine material does.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1994.tb00604.x
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