Hypotheses on L-H transition

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

ASDEX Johann spectrometer

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

On approximating invariant tori: block iterations and multigrid methods for the associated systems

SIGLEAvailable from TIB Hannover: RN7349(658) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

A branch-and-cut approach to physical mapping with end-probes

A fundamental problem in computational biology is the construction of physical maps of chromosomes from hybridization experiments between unique probes and clones of chromosome fragments in the presence of error. Alizadeh, Karp, Weisser and Zweig [AKWZ94] first considered a maximum-likelihood model of the problem that is equivalent to finding an ordering of the probes that minimizes a weighted sum of errors, and developed several effective heuristics. We show that by exploiting information about the end-probes of clones, this model can be formulated as a weighted Betweenness Problem. This affords the significant advantage of allowing the well-developed tools of integer linear-programming and branch-and-cut algorithms to be brought to bear on physical mapping, enabling us for the first time to solve small mapping instances to optimality even in the presence of high error. We also show that by combining the optimal solution of many small overlapping Betweenness Problems, one can effectively screen errors from larger instances, and solve the edited instance to optimality as a Hamming-Distance Traveling Salesman Problem. This suggests a new combined approach to physical map construction. (orig.)SIGLEAvailable from TIB Hannover: RR 1606(96-39) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Investigations of MHD activity in ADSEX discharges

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Recommendations for a modification of ASTM E 1457 to include creep-brittle materials

VAMAS Technical Working Area 19 on High Temperature Fracture of Brittle Materials has developed several new recommendations for determining and analysing the creep crack extension behaviour of creep-brittle materials. These recommendations, most of which are also useful for creep-ductile materials, include: machining narrow starter notches for brittle materials; definition of creep crack initiation; definition of creep toughness; recommendations for conducting creep crack growth tests under the conditions of constant displacement rates or step-wise increments in displacements and/or displacement rates, in addition to the usual constant force method; additional parameters for correlating the creep crack extension rate, such as stress intensity factor, K, C_t parameter, Q* parameter, and rate of #delta#_5 type CTOD, #delta#_5; and criteria for the various correlation parameters. These recommendations are presented in a form which should aid development of national and international standardization of creep crack extension test methods. (orig.)Special print from: Engineering Fracture Mechanics, v. 62 (1999), p. 123-142Available from TIB Hannover: RA 3251(99/E/16) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Damage tolerance analysis for rotorcraft, what the issues are

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman