A British Columbia record for Xenos peckii Kirby

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Characterisation of friction and lubrication regimes in premium tubular connections

A friction test rig has been developed to carry out repeated sliding friction tests for premium tubular connections. The test rig enables accurate measurement of friction in various contact regimes which are relevant to the threaded connections between tubular components. Higher load tests can simulate the contact in metal-to-metal seals under very high contact pressures by using perpendicular pin-on-pin tests. The contact in the thread loading flank under intermediate pressures can be simulated by using larger radius coupon-on-coupon tests. The measured coefficient of friction is well correlated with a lubrication parameter combining lubricant film thickness and initial surface roughness. © 2012 Elsevier Ltd. All rights reserved

Bidessus leachi, a new species of dytiscid water beetle from northern California (Coleoptera)

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Chrysls smaragdicolor from the nest of Osmia longula (Hymenoptera: Chrysididae and Megachilidae)

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The dates of publication of certain numbers of the Proceedings of the Entomological Society of British Columbia

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Local abundance of the wasps Chlorion atratum and Megastizus unicintus (Hymenoptera: Specidae and Bembicinae)

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Agabcs confertus eating Chironomid larvae (Coleoptera, Dytiscidae, Diptera)

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