Galois theory on the line in nonzero characteristic

The author surveys Galois theory of function fields with non-zero caracteristic and its relation to the structure of finite permutation groups and matrix groups.Comment: 66 pages. Abstract added in migration

Jacobian of meromorphic curves

The contact structure of two meromorphic curves gives a factorization of their jacobian.Comment: 41 pages, amstex, to be published in the Proceedings of the Indian Academy of Science

Techniques for the study of singularities with applications to resolution of 2-dimensional schemes

We give an overview of invariants of algebraic singularities over perfect fields. We then show how they lead to a synthetic proof of embedded resolution of singularities of 2-dimensional schemes.Comment: 26 pages; minor changes have been adde

Modeling, system identification, and control of ASTREX

The modeling, system identification and controller design aspects of the ASTREX precision space structure are presented in this work. Modeling of ASTREX is performed using NASTRAN, TREETOPS and I-DEAS. The models generated range from simple linear time-invariant models to nonlinear models used for large angle simulations. Identification in both the time and frequency domains are presented. The experimental set up and the results from the identification experiments are included. Finally, controller design for ASTREX is presented. Simulation results using this optimal controller demonstrate the controller performance. Finally the future directions and plans for the facility are addressed

Focussing on Defence R&D: an Insight Into DRDO

Introduction The Defence Research and Defence Organisation (DRDO) is the premier R&D organisation under the Ministry of Defence (MoD). R&D organisations are normally esoteric and their management processes are considered challenging and complex.2 DRDO's research is primarily for the benefit of the three defence services who also fall under the umbrella of MoD. This creates a unique and unusual situation in which the customers (viz. the three services) are fundamentally, similarly placed departments, like the R&D organisation, under the same ministry. Many literary excerpts on the subject point towards a feeling amongst the services that DRDO does not give the users (‘user' is DRDO's term for customers) requirements, a competitively equal importance on a similar level as a private player would have given, in such a competitive environment3 . It has been felt that there is a lack of mutual understanding and appreciation of the constraints faced by the services and DRDO. This feeling is only heightened by the fact that many important DRDO projects overshoot the budget and project timelines. DOI: 10.5281/zenodo.340594