1,721,938 research outputs found
A Novel Route to Dinuclear Thioether Chemistry, Synthesis and Structure of(9S3=1,4,7-Trithiacyclononane)
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Delamination crack originating from transverse cracking in cross-ply composite laminates under extension
No full textBased upon the Stroh formalism for anisotropic elastic materials and upon the method of eigenfunction expansion, the stress redistribution due to delamination cracks originating from transverse cracking is examined from [90/0]s and [0/90]s laminates under extension. The structure of the solution, in the form of a series expansion, is determined from the eigenvalue equation resulting from appropriate near-field conditions. To complete the solution, use is made of a boundary collocation technique in conjunction with the eigenfunction series that includes a large number of terms, enough to represent the elastic state throughout the appropriate domain concerned. The fracture mechanics parameters, such as stress intensity factors and energy release rates, are calculated and the major characteristics of stress distribution are discussed. The stability of delamination cracks is examined for varying ratios of ply thickness in terms of the energy release rate.The authors gratefully acknowledge the financial support for this work, provided by the Korea Science and Engineering Foundation (KOSEF)
Preliminary study on expansion characteristics of alkali-activated mortar incorporating power plant bottom ash
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Design of Communication Networks with Survivability Constraints
No full textThe rapid growth of telecommunication capacity, driven in part by the wide-ranging deployment of fiber-optic technology has led to increasing concern regarding the survivability of such networks. In communication networks, survivability is usually defined as the percentage of total traffic surviving some network failures in the worst case. Most of the survivable network design models proposed to date indirectly ensure network survivability by invoking a connectivity constraint, which calls for a prespecified number of paths between every distinct pair of nodes in the network. In this paper, we introduce a new network design model which directly addresses survivability in terms of a survivability constraint which specifies the allowable level of lost traffic during a network failure under prescribed conditions. The new model enables a network designer to consider a richer set of alternative network topologies than the existing connectivity models, and encompasses the connectivity models as special cases. The paper presents a procedure to compute link survivability, develops an integer programming formulation of the proposed survivability model, and discusses a special case of practical interest and its associated heuristic procedure. The proposed heuristic is tested on data from real-world problems as well as randomly generated problems
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