425,146 research outputs found

    Experimental and numerical investigations of hybrid high strength steel welded T-section stub columns with Q690 flange and Q460 web

    No full text
    202208 bcchNot applicableSelf-fundedPublished24 month

    Housing and identity expression among in-situ urbanised rural residents in China

    No full text
    202208 bcrcRGCPublished24 month

    An evaluation framework of automated electric transportation system

    No full text
    202104 bcvcNot applicableOthersResearch Institute for Sustainable Urban Development at the Hong Kong Polytechnic University (1-BBWF), Smart City Research Center at the National Institute of Development Administration (NIDA) in ThailandEarly release36 month

    Synthesis of magnolol-derived bisphosphate for fabrication of bismaleimide resins with intrinsic anti-flammability and smoke suppression

    No full text
    202208 bcchOthersHong Kong Scholars Program (Grant No.: XJ2020003)Published24 month

    174Yb+^{174}\mathrm{Yb}^+-113Cd+^{113}\mathrm{Cd}^+ sympathetic-cooling bi-species Coulomb crystal applied to microwave frequency standard

    Full text link
    We reported the realization of a 174Yb+^{174}\mathrm{Yb}^+-113Cd+^{113}\mathrm{Cd}^+ bi-species Coulomb crystal comprising 174Yb+^{174}\mathrm{Yb}^+ ions as coolant and verified its potential for application as a 113Cd+^{113}\mathrm{Cd}^+ microwave frequency standard employing sympathetic cooling.The two species of massive ions stably trapped in a Paul trap make up this large two-component crystal. The 113Cd+^{113}\mathrm{Cd}^+ ions are trapped in the center, which reduces considerably RF heating and excess micromotion to which the 113Cd+^{113}\mathrm{Cd}^+ ions are subjected. Under this scheme, the uncertainty due to the second-order Doppler effect is reduced to 5×10−165\times10^{-16}, which represents an order of magnitude improvement over sympathetic cooled 40Ca+^{40}\mathrm{Ca}^+-113Cd+^{113}\mathrm{Cd}^+ crystal. The uncertainty from the second-order Zeeman effect, which contributes the largest uncertainty to the microwave-ion frequency standard, is reduced to 4×10−164\times10^{-16}. The relevant AC Stark shift uncertainty is estimated to be 4×10−194\times10^{-19}. These results indicate using 174Yb+^{174}\mathrm{Yb}^+ as coolant ions for 113Cd+^{113}\mathrm{Cd}^+ is far superior and confirm the feasibility of a sympathetic-cooled cadmium-ion microwave clock system employing a 174Yb+^{174}\mathrm{Yb}^+-113Cd+^{113}\mathrm{Cd}^+ two-component crystal

    Spatial dynamics of Maine lobster landings in a changing coastal system

    Get PDF
    Continued warming of oceans has caused global shifts in marine species distributions. This can result in changes in the spatial distribution of landings and have distributional impacts on marine resource-dependent communities. We evaluated the spatial dynamics of American lobster (Homarus americanus) landings in coastal Maine, which supports one of the most valuable U.S. fisheries. We coupled a bioclimate envelope model and a generalized additive model to project spatial dynamics of lobster landings under possible climate scenarios. This coupled model was then used to forecast future lobster habitat suitability based on IPCC RCP climate scenarios and predict distributions of fishery landings from this projected lobster habitat suitability. The historical spatial distribution of fishery landings shows the highest proportional landings in Maine’s Southern (southwest) regions. The current distribution of landings shows higher proportional landings in Downeast (northeast) regions with the highest proportional landings in Midcoast (middle) regions. Our results suggest that while the proportion of landings in each zone will remain stable, changes in habitat suitability in the spring and fall will reduce total landings. Future habitat suitability is projected to decrease in spring but increase in fall in Downeast areas. Downeast landings are projected to decrease in the next 30 years, then increase over the subsequent 80 years, depending on RCP scenarios and abundance regimes. Midcoast landings are projected to decrease while Southcoast landings are expected to stay constant. This study develops an approach to link climate change effects to fishery landings. These findings have long-term implications for sustainable, localized management of the Maine lobster fishery in a changing climate
    • 

    corecore