Space science: Zero-gravity hero

From Hero to Zero

This article discusses the identity processes involved in the transition to retirement for emergency service workers, which includes police officers, fire fighters, and emergency medical personnel. The author conducted a study using the Enhanced Critical Incident Technique (ECIT) to determine what helped, hindered and might have helped emergency service workers in making decisions regarding ret...

From Zero to Hero: How Zero-Rating Became a Debate about Human Rights

Simulating Fluids in Zero Gravity

A lot of research has been conducted on achieving realistic fluid simulations: waves, flow, waterfalls, etc. This paper focuses on a less talked about aspect of fluid simulation: the behavior of liquids in zero gravity. Unlike in most other situations which are dominated by gravity, surface tension becomes the key phenomenon of the simulation. A spring-connected system of particles is used to m...

Zero and near-zero temperature black holes in semiclassical gravity

The semiclassical Einstein equations are solved to first order in ǫ = h̄/M for the case of an extreme or nearly extreme Reissner-Nordström black hole perturbed by the vacuum stress-energy of quantized free fields. It is shown that the perturbed solution at first order is not unique; there exists a sequence of solutions with varying values of the position of the event horizon, rh. The smaller the...

3D gravity data-space inversion with sparseness and bound constraints

One of the most remarkable basis of the gravity data inversion is the recognition of sharp boundaries between an ore body and its host rocks during the interpretation step. Therefore, in this work, it is attempted to develop an inversion approach to determine a 3D density distribution that produces a given gravity anomaly. The subsurface model consists of a 3D rectangular prisms of known sizes ...