Qinetiq

About: Qinetiq is a company organization based out in Farnborough, United Kingdom. It is known for research contribution in the topics: Radar & Signal. The organization has 2452 authors who have published 2814 publications receiving 77395 citations. The organization is also known as: QinetiQ Group plc & QuinetiQ.

Geant4—a simulation toolkit

Abstract: G eant 4 is a toolkit for simulating the passage of particles through matter. It includes a complete range of functionality including tracking, geometry, physics models and hits. The physics processes offered cover a comprehensive range, including electromagnetic, hadronic and optical processes, a large set of long-lived particles, materials and elements, over a wide energy range starting, in some cases, from 250 eV and extending in others to the TeV energy range. It has been designed and constructed to expose the physics models utilised, to handle complex geometries, and to enable its easy adaptation for optimal use in different sets of applications. The toolkit is the result of a worldwide collaboration of physicists and software engineers. It has been created exploiting software engineering and object-oriented technology and implemented in the C++ programming language. It has been used in applications in particle physics, nuclear physics, accelerator design, space engineering and medical physics.

Geant4 developments and applications

Abstract: Geant4 is a software toolkit for the simulation of the passage of particles through matter. It is used by a large number of experiments and projects in a variety of application domains, including high energy physics, astrophysics and space science, medical physics and radiation protection. Its functionality and modeling capabilities continue to be extended, while its performance is enhanced. An overview of recent developments in diverse areas of the toolkit is presented. These include performance optimization for complex setups; improvements for the propagation in fields; new options for event biasing; and additions and improvements in geometry, physics processes and interactive capabilities

Water capture by a desert beetle

Abstract: This insect has a tailor-made covering for collecting water from early-morning fog. Some beetles in the Namib Desert collect drinking water from fog-laden wind on their backs1. We show here that these large droplets form by virtue of the insect's bumpy surface, which consists of alternating hydrophobic, wax-coated and hydrophilic, non-waxy regions. The design of this fog-collecting structure can be reproduced cheaply on a commercial scale and may find application in water-trapping tent and building coverings, for example, or in water condensers and engines.

Standoff Detection of Weapons and Contraband in the 100 GHz to 1 THz Region

Abstract: The techniques and technologies currently being investigated to detect weapons and contraband concealed on persons under clothing are reviewed. The basic phenomenology of the atmosphere and materials that must be understood in order to realize such a system are discussed. The component issues and architectural designs needed to realize systems are outlined. Some conclusions with respect to further technology developments are presented.

Gear change mechanism

Abstract: A gear change mechanism coupling a pair of shafts (2) and (9) employs a planetary gear set comprising a sun gear (10) fast with shaft (2), planet gears (12) in a planet carrier (15), and an annulus or ring gear (17), the latter being fixed. A selector hub (19) slidable on shaft (9) has sets of radially spaced dogs (22) and (24) to engage with corresponding dogs (29) and (34) on the planet carrier and sun gear respectively, so as to couple the shafts (2) and (9) at two different ratios depending on the axial position of the selector hub. This results in a more axially compact package than conventional dog clutch gear changers. In an alternative embodiment a reversing mechanism is provided by fixing the planet carrier and engaging the selector hub with the sun gear or annulus depending on its axial position.