Swedish Defence Research Agency

About: Swedish Defence Research Agency is a government organization based out in Stockholm, Sweden. It is known for research contribution in the topics: Radar & Laser. The organization has 1413 authors who have published 2731 publications receiving 56083 citations. The organization is also known as: Totalförsvarets forskningsinstitut.

Review of laser sensing devices and systems

Abstract: The area of laser sensing is vast. This review will be limited to some examples of laser sensing of relevance for defense and security applications especially those of relevance to countermeasures. Examples from the areas ISR (Intelligence, Surveillance and Reconnaissance), target acquisition/recognition, warning/protection and some miscellaneous applications such as positioning, tagging, communication and weapon guidance will be given. The laser sensor can itself have a multifunction capability and will probably not be the only sensor in a system. Future possibilities of powerful multisensor systems using new device technology will be discussed.

Theoretical treatment of fluid flow for accelerating bodies

Abstract: Most computational fluid dynamics simulations are, at present, performed in a body-fixed frame, for aeronautical purposes. With the advent of sharp manoeuvre, which may lead to transient effects originating in the acceleration of the centre of mass, there is a need to have a consistent formulation of the Navier–Stokes equations in an arbitrarily moving frame. These expressions should be in a form that allows terms to be transformed between non-inertial and inertial frames and includes gravity, viscous terms, and linear and angular acceleration. Since no effects of body acceleration appear in the inertial frame Navier–Stokes equations themselves, but only in their boundary conditions, it is useful to investigate acceleration source terms in the non-inertial frame. In this paper, a derivation of the energy equation is provided in addition to the continuity and momentum equations previously published. Relevant dimensionless constants are derived which can be used to obtain an indication of the relative significance of acceleration effects. The necessity for using computational fluid dynamics to capture nonlinear effects remains, and various implementation schemes for accelerating bodies are discussed. This theoretical treatment is intended to provide a foundation for interpretation of aerodynamic effects observed in manoeuvre, particularly for accelerating missiles.

Accounting for bacterial overlap between raw water communities and contaminating sources improves the accuracy of signature-based microbial source tracking

Abstract: Microbial source tracking (MST) analysis is essential to identifying and mitigating the fecal pollution of water resources. The signature-based MST method uses a library of sequences to identify co ...

Forward‐Angle Neutron‐Proton Scattering at 96 MeV

Abstract: The differential np scattering cross section has been measured at 96 MeV in the angular range θc.m. = 20° – 76°. A full angular distribution coverage was obtained by combination with an earlier backward‐angle data set at the same energy. An accurate normalization has been obtained by normalizing this extended data set to the experimental total np cross section. A novel normalization technique has been investigated. The results on forward np scattering are in reasonable agreement with theory models and partial wave analyses and have been compared with data from the literature.