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  • 11
    Electronic Resource
    Electronic Resource
    Computer algorithms for calculating efficient initial vectors for subspace iteration method (1987)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 24 (1987), S. 1841-1848 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In this paper, the effects of selecting initial vectors on computation efficiency for a subspace iteration method are investigated. Four algorithms are used for selecting the initial vectors. First, arbitrary starting iteration vectors are chosen according to Bathe and Wilson's algorithm.1 In the other algorithms, the initial vectors are the retrieved eigenvectors from the Guyan and quadratic reduction methods. Improvement of the eigenvalue approximations of the subspace iteration method over reduction methods is presented. The computation effort is examined for the various algorithms used for initial iteration vectors.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620241003
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  • 12
    Electronic Resource
    Electronic Resource
    Three-dimensional computer code for dynamic response of solids to intense impulsive loads (1979)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 14 (1979), S. 1865-1871 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Earlier publications demonstrated the capability of the EPIC-3 code to perform high velocity impact computations in three dimensions.1,2 These capabilities were demonstrated with simplified material and sliding surface models in a core-contained computer program. This paper presents recent developments which include more comprehensive material and sliding surface formulations, and an expanded computer program which can handle problems of unlimited size by beffering data between disc files and core. The EPIC-3 code is based on an explicit, finite element, Lagrangian formulation which uses constant strain tetrahedral elements.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620141208
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  • 13
    Electronic Resource
    Electronic Resource
    Who was ‘-Raphson’? (1979)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 14 (1979), S. 148-152 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620140112
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    Paper (German National Licenses)
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  • 14
    Electronic Resource
    Electronic Resource
    Dynamic Lagrangian computations for solids, with variable nodal connectivity for severe distortions (1986)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 23 (1986), S. 509-522 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper presents an algorithm for dynamic Lagrangian computations for solids, in plane strain geometry, with variable nodal connectivity to allow for severe distortions. The nodes are somewhat analogous to flexible circular disks. When they move closer together than their equilibrium distance they generate compressive, repulsive forces. Conversely, when they move apart, they generate tensile, attractive forces. Material strength effects are also included. Because a node can only be affected by its ‘neighbour’ nodes, the approach has been designated the ‘NABOR’ approach. The key to this approach is that it is possible to have variable nodal connectivity - a node can acquire new neighbours, thus allowing all forms of distortion. The NABOR algorithm has been incorporated as an option into the explicit finite element code, EPIC-2. By using both the NABOR grid and the EPIC-2 finite element grid together, it is possible to perform Lagrangian computations for a wide range of problems.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620230313
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  • 15
    Electronic Resource
    Electronic Resource
    On the accuracy of polynomial finite elements for crack problems (1981)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 17 (1981), S. 1835-1842 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A square tensile sheet with symmetric edge cracks is analysed by the finite element method to demonstrate the accuracy obtained with polynomial elements when the mesh patterns are chosen on the basis of the element's interpolation functions. Numerical results are provided for the accuracy of the total strain energy, the stress intensity factor, and the numerical condition of the global stiffness matrix. The stress intensity factor is determined to within 1.0 per cent accuracy using quadratic (linear strain) triangular elements with only 138 degrees-of-freedom.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620171208
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  • 16
    Electronic Resource
    Electronic Resource
    Evaluation of some numerical schemes for consolidation (1973)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 7 (1973), S. 243-254 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Five finite difference and two finite element schemes for solution of the one-dimensional consolidation problem are compared and evaluated from the viewpoints of convergence, accuracy, stability and computational efforts. An example problem involving laboratory experiments is also solved by using various schemes. Conclusions are drawn regarding relative suitability of these schemes for practical applications.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620070303
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  • 17
    Electronic Resource
    Electronic Resource
    Quadratic reduction for the eigenproblem (1980)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 15 (1980), S. 911-923 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A quadratic method is presented for solving the eigenvalue problem of a structural system having a large number of degrees-of-freedom. The eigenproblem is reduced to a smaller problem by condensing the system stiffness and mass using Guyan reduction. Application of a set of corrective displacements to the reduced system subsequently leads to an eigenproblem of quadratic form involving an additional mass term. To obtain the solution to the reduced problem, inverse iteration with spectrum shifts based on the eigenvalues of the Guyan problem is used. The resulting eigenvalues and mode shapes represent a corrected Guyan approximation to the solution of the unreduced system. In addition, it is shown that the amount of improvement over the Guyan solution can be approximated by employing a first-order error analysis procedure. Numerical examples of vibrations of a bar, a beam and a plate demonstrate that the solutions obtained from the quadratic reduction procedure are very accurate and require relatively little additional computational effort in comparison with the solutions of the corresponding linear eigen-problem. The relationship of the present method to that proposed by Przemieniecki is illustrated by an example.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620150609
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  • 18
    Electronic Resource
    Electronic Resource
    Attributional, life-event, and affective predictors of onset of depression, anxiety, and negative attributional style (1990)
    Springer
    Cognitive therapy and research 14 (1990), S. 417-430 
    Details
    ISSN: 1573-2819
    Keywords: attributional style ; life events ; depression ; anxiety
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Abstract This investigation examined (1) the extent to which negative attributional style and life events predict the development of depression and anxiety, and (2) the extent to which measures of life events, depression, and anxiety predict the development of negative attributional style. Sets of questionnaires, including the Attributional Style Questionnaire (ASQ), the Multiple Affect Adjective Check List (MAACL), the Beck Depression Inventory (BDI), the Stimulus-Response Inventory of General Trait Anxiousness (SR-GTA), and the Life Experiences Survey (LES), were administered to 80 undergraduate students on two occasions separated by a 1-month interval, between midterm and final examination periods of an academic semester. Results of hierarchical multiple regression analyses indicated that (1) composite negative attributional style predicted the onset of anxiety, measured by the MAACL anxiety scale, and (2) depression, measured by the MAACL depression scale, and low amounts of desirable life events each predicted the onset of composite negative attributional style.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01172936
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  • 19
    Electronic Resource
    Electronic Resource
    Vulnerability to distress: Cognitive and emotional reactivity in chronically self-focused individuals (1992)
    Springer
    Cognitive therapy and research 16 (1992), S. 451-472 
    Details
    ISSN: 1573-2819
    Keywords: cognition ; self-focus ; affect ; depression ; information processing ; vulnerability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Abstract Self-focused attention has been related to a number of both normal and dysfunctional processes. Several recent studies have suggested that the dispositional equivalent of self-focused attention, private self-consciousness, may serve as a vulnerability factor for emotional distress. To test this proposition, two studies were conducted. In the first, individuals high and low in chronic self-focus were provided with either success or failure feedback, and reactions to this feedback on several cognitive and affective variables were assessed. Results indicated that chronically self-focused individuals responded with significantly more negative affect, dysfunctional negative thoughts, and less self-deception. In the second study, a naturalistic experiment was conducted where chronically self-focused subjects were assessed weekly over a 10-week period to determine if they encountered more negative affect than a non-self-focused comparison group. Although self-focused and non-self-focused subjects started out with equal levels of negative emotion, self-focused subjects reported reliably higher levels of negative affect during the last two-thirds of the assessment period. Results from both studies are discussed in terms of implications of the vulnerability of individuals who are typically high in internal attention.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01183168
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  • 20
    Electronic Resource
    Electronic Resource
    Comorbidity of Conduct and Depressive Problems at Sixth Grade: Substance Use Outcomes Across Adolescence (1998)
    Springer
    Journal of abnormal child psychology 26 (1998), S. 221-232 
    Details
    ISSN: 1573-2835
    Keywords: Comorbidity ; conduct disorder ; depression ; substance use
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Abstract The comorbidity of conduct and depressive problems and substance use outcomes were examined in a community-based sample of 340 African American males and females. Alcohol, tobacco, and marijuana use were examined at Grades 6, 8, and 10 based on the following group membership at sixth grade: (a) comorbid conduct and depressive problems; (b) conduct problems only; (c) depressive problems only; (d) neither conduct nor depressive problems. Overall, the two conduct problem groups displayed the highest levels of substance use, although at some time points, comorbid youth displayed significant higher substance use levels. Subjects with depressive problems only displayed levels of substance use that were equivalent to subjects in the nonproblem group. Results highlight the importance of controlling for comorbid symptoms, possible interactive effects between conduct and depressive problems, and implications for treatment and prevention of substance use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022676302865
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