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  • Articles: DFG German National Licenses  (7)
  • Chemistry  (4)
  • evolutionary algorithms  (2)
  • 25.70.Lm  (1)
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  • Articles: DFG German National Licenses  (7)
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Years
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  • 1
    Electronic Resource
    Electronic Resource
    Computer-assisted manufacturing process optimization with neural networks (1998)
    Springer
    Journal of intelligent manufacturing 9 (1998), S. 289-294 
    Details
    ISSN: 1572-8145
    Keywords: Manufacturing process chain ; modelling ; optimization ; neural networks ; evolutionary algorithms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Today's manufacturing methods are caught between the growing need for quality, high process safety, minimal manufacturing costs, and short manufacturing times. In order to meet these demands, process setting parameters have to be chosen in the best possible way, according to demand on quality. For such optimization it is necessary to represent the processes in a model. Due to the enormous complexity of many processes and the high number of influencing parameters, however, conventional approaches to modelling and optimization are no longer sufficient. In this article it is shown how, by means of applying neural networks for process modelling, even these highly complex interdependencies can be learned. That way both process and quality parameters can be assessed before or during processing. By connecting them with corresponding cost models, it is possible to optimize processes with the help of evolutionary algorithms. Using examples of different manufacturing processes, the possi bilities for process modelling and optimization with neural networks and evolutionary algorithms are demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008966407212
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Simulation based on learning methods (1998)
    Springer
    Journal of intelligent manufacturing 9 (1998), S. 331-338 
    Details
    ISSN: 1572-8145
    Keywords: Simulation ; modelling ; machine learning ; evolutionary algorithms ; artificial neural network
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The use of simulation technology as a tool for planning and control is of increasing significance in most fields of production. The main part of the expenditure concerning simulation analyses is the modelling of the considered production. Despite the use of modern building-block-oriented modelling technology, this modelling can often not be done by the user, but only by external experts. Against this backdrop, an adaptive simulation system is being developed by the Institute for Industrial Manufacturing and Management (IFF) at the University of Stuttgart. It independently adapts to real production processes, i.e. it learns about the interdependencies of production processes, and, in this way, supports the user in constructing and maintaining the model. In terms of information technology, the research in the field of artificial intelligence, especially in the subdomain of machine learning, is the basis for the realization of such adaptive systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008926825868
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Projectile break-up with two outgoing intermediate-mass fragments in 26 AMeV32S+197Au (1993)
    Springer
    The European physical journal 345 (1993), S. 29-35 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Lm ; Mn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Correlations between two intermediate-mass fragments resulting from 840 MeV32S projectiles interacting with197Au were measured. The angular correlations and absolute two-fragment cross sections agree with predictions of a semi-microscopic model for direct dynamic projectile break-up. This suggests a predominantly direct mechanism for the production of intermediate-mass fragment pairs. It is argued that the intensity of such a channel which, compared to decays yieldingα particles, is much larger than observed for the sequential decay of corresponding primary excited nuclei, supports the direct-break-up interpretation. The model mechanism yields also strongly damped projectile fragments of intermediate mass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290336
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Beiträge zur Kenntnis von Hydrogelen. VII. Mitteilung. Über Chromioxydhydrate (1929)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 185 (1929), S. 107-129 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19291850108
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Structure of an insect virus at 3.0 Å resolution (1987)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 2 (1987), S. 167-176 
    Details
    ISSN: 0887-3585
    Keywords: icosahedral ; insect ; virus ; structure ; evolution ; nodavirus ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: We report the first atomic resolution structure of an insect virus determined by single crystal X-ray diffraction. Black beetle virus has a bipartite RNA genome encapsulated in a single particle. The capsid contains 180 protomers arranged on a T = 3 surface lattice. The quaternary organization of the protomers is similar to that observed in the T = 3 plant virus structures. The protomers consist of a basic, crystallographically disordered amino terminus (64 residues), a β-barrel as seen in other animal and plant virus subunits, an outer protrusion composed predominantly of β-sheet and formed by three large insertions between strands of the barrel, and a carboxy terminal domain composed of two distorted helices lying inside the shell. The outer surfaces of quasi-threefold related protomers form trigonal pyramidyl protrusions. A cleavage site, located 44 residues from the carboxy terminus, lies within the central cavity of the protein shell.The structural motif observed in BBV (a shell composed of 180 eight-stranded antiparallel β-barrels) is common to all nonstatellite spherical viruses whose structures have so far been solved. This highly conserved shell architecture suggests a common origin for the coat protein of spherical viruses, while the primitive genome structure of BBV suggests that this insect virus represents an early stage in the evolution of spherical viruses from cellular genes.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prot.340020302
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Electronic and structural properties of defects in c-BN (1997)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 65 (1997), S. 941-946 
    Details
    ISSN: 0020-7608
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using a molecular cluster with 71 atoms, we studied the electronic and structural properties of nitrogen vacancy, boron antisite, and oxygen in cubic boron nitride through an ab initio Hartree-Fock calculation. We found that all defects introduce a deep state above the middle-energy gap. These defects present a C3v local symmetry. In the case of nitrogen vacancy, the possibility of the F-center formation is discussed. All the calculations were performed using the program code GAMESS.   © 1997 John Wiley & Sons, Inc. Int J Quant Chem 65: 941-946, 1997
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 7
    Electronic Resource
    Electronic Resource
    Übergangsmetall-substituierte Acylphosphane und Phosphaalkene. 17 [1] Synthese und Struktur der μ-Isophosphaalkin-Komplexe [(η5-C5H5)2(CO)2Fe2(μ-CO)(μ-C=PC6H2R3-2,4,6)] (R = Me, iPr, tBu) (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1759-1764 
    Details
    ISSN: 0044-2313
    Keywords: Transition metal substituted phosphaalkenes ; isophosphaalkyne complex ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Substituted Acylphosphanes and Phosphaalkenes. 17. Synthesis and Structure of the μ-Isophosphaalkyne Complexes [(η5-C5H5)2(CO)2Fe2(μ-CO)(μ-C=PC6H2R3)] (R = Me, iPr, tBu).Condensation of (η5-C5H5)2(CO)2Fe2(μ-CO)(μ-CSMe)}+SO3CF3- (6) with 2,4,6-R3C6H2PH(SiMe3) (7) (a: R = Me, b: R = iPr, c: R = tBu) affords the complexes (η5-C5H5)2(CO)2Fe2(μ-CO)(η-C=PC6H2R3-2,4,6) (9 a-c) with edge-bridging isophosphaalkyne ligands as confirmed by the x-ray structure analysis of 9 a.
    Notes: Die Kondensation des μ-Carbinkomplexes {(η5-C5H5)2(CO)2Fe2(μ-CO)(μ-CSMe)}+SO3CF3- (6) mit den Phosphanen 2,4,6-R3C6H2PH(SiMe3) (7) (a: R = Me, b: R = iPr, c: R = tBu) liefert die Komplexe (η5-C5H5)2(CO)2Fe2(μ-CO)(η-C=PC6H2R3-2,4,6) 9a-c, die die neuartigen Isophosphaalkine C≡P-Aryl als Brückenliganden tragen. Von 9 a wurde eine Röntgenstrukturanalyse durchgeführt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936191023
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    Paper (German National Licenses)
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