4 research outputs found
Bursting Smoke as an Infrared Countermeasure
This paper describes the experimental setup for the evaluation of bursting smoke for anti-infrared role using SR-5000 spectroradiometer and a source of IR radiation (8-13 micrometer) using cadmium-mercury-telluride (CMI) detector cooled by liquid nitrogen. The particle size and shape of the powders used in the bursting smokes were determined microscopically using Carl Zeiss Jena Neophot- 21. Highest attenuation of 97 -lOO percent was produced for about 12 s using a mixture of bronze flakes and chaff, and for about 8 s using a mixture of bronze copper lined flakes, bronze flakes and chaff
Glycidyl Azide Polymer-based Enhanced Energy LOVA Gun Propellant
In this study, cyclotrimethylene trinitramine propellants with triacetin (TA)-plasticisedcellulose acetate (CA) and nitrocellulose (NC) combination as binders were evaluated for lowvulnerable ammunition (LOVA). Triacetin was replaced by energetic plasticiser; glycidyl azidepolymer (GAP) in increments to enhance the performance in terms of force constant . In additionto ballistics, parameters like vulnerability, mechanical and thermal properties of GAP-basedpropellants in comparison to those of TA-based propellants, were also determined. The studybrings out that the incorporation of 2-6 per cent GAP in place of TA resulted in the enhancementof force constant by 22-70 J/g and improved overall combustion characteristics. DSC revealedthat thermal decomposition of GAP-LOVA propellants evolved more energy than TA-LOVApropellants. GAP-based LOVA propellant similar to TA-plasticised LOVA propellant, was foundsuperior to NQ propellant in vulnerability tests as well as in hot fragment conductive ignition(HFCI) studies. As regards mechanical properties, incorporation of GAP resulted in improvedcompression strength
Selecting sites to prove the concept of IAR4D in the Lake Kivu Pilot Learning Site
Selecting sites is an essential step in enabling the assessment of the impact of Integrated
Agricultural Research for Development (IAR4D) in the Lake Kivu Pilot Learning Site. This paper
reports on the process of identifying distinct administrative territories (sites) in which to establish
innovation platforms and to monitor similar communities that are experiencing alternative
agricultural research for development interventions. We show how the research design for the Sub-
Saharan Africa Challenge Programme (SSACP) has been modified to take into account the key
conditioning factors of the LKPLS without relinquishing robustness. A key change is the explicit
incorporation of accessibility to multiple markets. Candidate sites were stratified according to the
national political context, followed by good and poor accessibility to markets and finally according
to security considerations and agro-ecology. Randomisation was carried out at all levels, although
the need for paired counterfactual sites required the diagnosis of conditioning factors at the site
level. Potential sites were characterised in terms of existing or recent agricultural research
initiatives, as well as local factors that would have a direct effect on the success of interventions
seeking to improve productivity, ameliorate the degradation of natural resources and enhance
incomes through better links to markets. Fourteen sites were selected during the initial phase, and a
further ten sites were added one year afterwards due to the need for more innovation platforms to
test IAR4D. The site selection was successful in pairing action and counterfactual sites in terms of
the baseline socioeconomic conditions of farming households. The unavoidable proximity of action
and counterfactual sites, however, allows the possibility of spill-over effects and could reduce the
measurable impact of IAR4D
Nontoxic/Environmentally Acceptable Pyrotechnic Smokes
455-459The pyrotechnic smokes have several
applications, both in civil and defence fields. In the recent past, nontoxic and
environmentally acceptable smokes have gained importance because of increased awareness
regarding the need to have a healthy environment, free from
toxic pollutants. The paper reviews
nontoxic, environmentally acceptable smokes and suggests future line of work in
this area