Dynamics of gravity-type pneumatic percussion machine for drain hole drilling

Models for Solidification and Splashing in Laser Percussion Drilling

This paper studies systems of partial differential equations modelling laser percussion drilling. The particular phenomenon considered in detail is the ejection of the thin layer of molten material. This thin layer is modelled as an inviscid flow between the fluid surface and fluid/solid interface, both of which are unknown moving boundaries. Through a regular asymptotic expansion, the governin...

The Arthritic Sequelae of Pneumatic Drilling.

Experimental Study in the Process Parameters in Laser Percussion Drilling

In order to service and grow in the present day of global competition, every manufacturing concern focuses mostly on two factors i.e. productivity and quality. Laser drilling is a popular non-traditional machining technique for producing large numbers of cooling holes of various sizes (less than mm diameter) and angles in modern aerotech components such as turbine blades, injector nozzles, and ...

Quantum Gravity and Black Hole Dynamics in 1+1 Dimensions

We study the quantum theory of 1+1 dimensional dilaton gravity, which is an interesting toy model of the black hole dynamics. The functional measures are explicitly evaluated and the physical state conditions corresponding to the Hamiltonian and the momentum constraints are derived. It is pointed out that the constraints form the Virasoro algebra without central charge. In ADM formalism the mea...

Gravity Drilling of Mass Differentiated Planets

Introduction: The internal structures of terrestrial planets are commonly constrained by seismic data and geochemical considerations. We suggest that these constraints may be augmented by gravity drilling that focuses on interpreting satellite altitude free-air gravity observations for boundary undulations of the internal density layers related to mass flow. This approach involves separating th...