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Couvrat J.-F.,ALPHAROC Drilling and Blasting EPC Group | Dernoncourt J.-R.,ALPHAROC Drilling and Blasting EPC Group | Martareche F.,BEC Group
Rock Fragmentation by Blasting, FRAGBLAST 10 - Proceedings of the 10th International Symposium on Rock Fragmentation by Blasting | Year: 2013

The French Union of Explosives Engineers, Synduex, has commissioned an environmental impact study regarding the use of industrial explosives in quarries and construction sites. Based on the results, which cover everything from the greenhouse gas emission of explosives to their levels of energy consumption, a tool has been designed to compare the various fragmentation methods used by professionals. © 2013 Taylor & Francis Group.


There is a growing body of evidence suggesting that widespread (i.e. common) rather than geographically restricted species (i.e. rare) shape the overall distribution patterns of species richness. This is a non-intuitive fact, given that local and regional assemblages are normally composed by numerous rare species and few common ones. We evaluated here the primacy of common species in a biogeographic transition zone, where rarity has frequently a higher incidence. We analysed the geographical variability of trees and shrubs in Uruguay, located in a transitional zone between prairie and forest biomes, to assess the relative contribution of rare and common species to the generation of richness patterns. The distribution of 301 species of the native woody assemblage of Uruguay was mapped over the national grid system (302 quadrants of approximately 22×30km), using published data and herbarium records. The overall assemblage was segregated into four subassemblages in function of species distribution (quartiles). Species richness in the four quartiles was positively correlated with overall richness, but common species (quartile 3) showed the highest level of correlation. Then, we ranked species from the most widespread to the most restricted (common-to-rare) and from the most restricted to the most widespread (rare-to-common). Along each stage of the sequences we obtained a series of species richness patterns for increasing numbers of species. Correlating the species richness pattern for each subassemblage of both sequences with that of the full assemblage, we also found higher correlations in the common-to-rare sequence. We conclude the Uruguayan woody plants assemblage has a very large number of rare species as expected for a transitional biogeographical zone, but it was the common species that contributed most to the overall pattern of species richness. We propose the low contribution of rare species is explained by the most interspecific variability in ecological determinants within the assemblage of rare species. Therefore the spatial covariance among rare species is low, and so is the relationship with overall species richness. © 2012 Ecological Society of Australia.


Altin P.A.,Australian National University | Johnsson M.T.,Australian National University | Negnevitsky V.,BEC Group | Dennis G.R.,Australian National University | And 9 more authors.
New Journal of Physics | Year: 2013

We present a precision gravimeter based on coherent Bragg diffraction of freely falling cold atoms. Traditionally, atomic gravimeters have used stimulated Raman transitions to separate clouds in momentum space by driving transitions between two internal atomic states. Bragg interferometers utilize only a single internal state, and can therefore be less susceptible to environmental perturbations. Here we show that atoms extracted from a magneto-optical trap using an accelerating optical lattice are a suitable source for a Bragg atom interferometer, allowing efficient beamsplitting and subsequent separation of momentum states for detection. Despite the inherently multi-state nature of atom diffraction, we are able to build a Mach-Zehnder interferometer using Bragg scattering which achieves a sensitivity to the gravitational acceleration of Δg/g = 2.7 × 10-9 with an integration time of 1000 s. The device can also be converted to a gravity gradiometer by a simple modification of the light pulse sequence. © IOP Publishing and Deutsche Physikalische Gesellschaft.


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The Right Tools For The Job Working with BEC Group means you have access to all our design, tooling and moulding equipment under one roof. This enables us to offer our customers superior services, such as rapid tooling, which means you can benefit from faster lead times without having to worry about any lapses in quality ...


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About BEC Plastic Manufacturers When you think of plastics manufacturing, whats the first thing that comes to mind? Is it huge factory assembly lines in some far off country, churning out cheaply mass-manufactured disposable goods? Or do you think about finely crafted products, fashioned close to home by experts with over three decades of experience? Here at BEC Group we are proud to specialise in the latter. Were a UK based company dedicated to offering bespoke plastic design, tooling and moulding services ...

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