Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1995-1999  (3)
  • 73B04  (1)
  • 90B35  (1)
  • (Human)
  • Polymer and Materials Science
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Computing 57 (1996), S. 255-271 
    ISSN: 1436-5057
    Keywords: 90B35 ; 68M20 ; k-partitioning containing kernels ; NP-complete ; worst case analysis ; LPT-algorithm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Seik≥2 eine natürliche Zahl undG= $$\{ g_1 ,g_2 , \cdots ,g_m \} \cup \{ t_1 ,t_2 , \cdots ,t_n \} $$ eine Menge von höchstenskm nichtnegativen ganzen Zahlen. Gesucht ist eine Partition vonG= $$\{ g_1 ,g_2 , \cdots ,g_m \} \cup \{ t_1 ,t_2 , \cdots ,t_n \} $$ inm Teilmengen, die jeweils nicht mehr alsk Elemente enthalten, sodaß alleg i (Kerne genannt) unterschiedlichen Teilmengen zugeordnet werden und die maximale Summe von Zahlen in einer dieser Teilmengen möglichst klein wird. Wir zeigen zunächst, daß für jedesk≥3 dieses Problem NP-vollständig im starken Sinne ist. Als Heuristik für dieses Problem benutzen wir eine revidierte Version des bekannten LPT-Algorithmus für das Multiprozessorscheduling-Problem. Fürk=3 zeigen wir eine Worst-Case Schranke von 3/2–1/2m.
    Notes: Abstract LetG= $$\{ g_1 ,g_2 , \cdots ,g_m \} \cup \{ t_1 ,t_2 , \cdots ,t_n \} $$ be a list of items with nonnegative weights assigned andk≥2 be an integer. The objective is to find an assignment of the items to the bins such that allg i (called kernels) are assigned to different bins, such that no bin contains more thank items, and such that the maximum weight assigned to any bin becomes minimum. In this paper, we first prove that the problem is NP-complete in the strong sense for anyk≥3. As heuristic for this problem, we use a modified version of the famous LPT-algorithm for multiprocessor scheduling, and we show a worst case bound of 3/2–1/2m fork=3.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of elasticity 44 (1996), S. 1-8 
    ISSN: 1573-2681
    Keywords: 73B04 ; 73C02 ; anisotropic elasticity ; Galerkin vector ; displacement potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Displacement potentials in linear static elasticity consist of three functions which can be regarded as the three components of a vector, e.g., the Galerkin vector. This research note gives an explanation as to why the biharmonic equations govern these functions in isotropic elasticity as opposed to the sixth-order partial differential equations that govern them in anisotropic elasticity. This note also shows that the Eshelby solution in two-dimensional anisotropic elasticity can be derived from the method of displacement potentials.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 793-799 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Characteristics of gas penetration and polymer melt flow in gas-assisted injection molded spiral tubes was investigated by simulations and experiments. Distribution of the skin melt thickness along the gas flow direction was measured, and gas penetration in the primary and secondary stages was identified. An algorithm based on the control-volume/tiniteelement method combined with a particle-tracing scheme using a dual-filling-parameter technique is utilized to predict the advancements of both melt front and gas from during the molding process. The simulated distribution of gas penetration shows reasonably good coincidence with experimental observations. © 1995 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...