A systematic analysis is presented on the reaction K+p→K∗0 (890) Δ++ for nine incident momenta between 4.6–16.0 GeV/c. Cross sections, differential cross sections and vector meson single density matrix elements are given. As a function of energy, little if any change is observed in either the shapes of the differential cross sections or in the values of the density matrix elements. The data are interpreted in terms of current ideas on t-channel exchange mechanisms.

To understand better the production mechanism responsible for the vector meson density matrix elements and production angular distributions recently obtained in an analysis of K+p → K∗0Δ++ from 4.6 to 16 GeV/c, a comparison is made with the reactions π+p → (ϱ0, ω)Δ++ and K−n → K∗0 Δ. In particular, the properties of K− and K+ induced K∗Δ production are qualitatively understood in terms of the ϱΔ and ωΔ production data via an SU(3) sum-rule. The corresponding nucleon production data are also investigated. Implications for the extraction of Kπ phase shifts are noted and some comments and recommendations on the extraction of resonance cross sections are made.

Results are presented on an analysis of the reaction K+p → K∗+ (890) p at 16 GeV/c and compared with data at lower incident momenta and with corresponding results for the reaction K−p → K∗− (890) p. It is found for both reactions that the energy dependence of the cross section exhibits a simple (p−nlab behaviour.

The fracture characteristics of Al–Si based eutectic alloy are investigated in the unmodified and modified conditions under compression. The investigations are carried out at different strain rates and temperatures. Fracture of the alloy starts with eutectic Si particle fracture and modification plays an important role in particle fracture. The fraction of fractured particles is found to be always lesser in the modified condition than in the unmodified condition. Particle fracture increases with increase in strain. It is found that the Si particle fracture shows an increase with increase in strain rate and decreases with increase in temperature at 10% strain. Large and elongated particles show a greater tendency for fracture in the unmodified and modified conditions. Particle orientation plays an important role on fracture and the cracks are found to occur almost in a direction normal to the tensile strain imposed upon the particles by the deforming matrix in the unmodified alloy. The modified alloy shows a random distribution of fractured particles and crack orientation. The criteria of fracture based on dislocation pile-up mechanism and fiber loading explain the observed difference in particle fracture characteristics due to modification. The particle fracture for the modified alloy is also discussed in terms of Weibull statistics and the existing models of dispersion hardening. Particle/matrix interface decohesion is observed at higher strain rates and temperatures in the modified alloy. Dendritic rotation of 10° is also observed at higher strain rates, which can increase the amount of particle fracture.