To solve the durability of island and reef concrete engineering in the harsh environment of high temperature, high salt, high humidity and windy, the strength grade of concrete and the type of corrosion inhibitor were used as the influence factors, while the relative dynamic elastic modulus was used as the evaluation index. In addition, the law and time variability of the deterioration of concrete, the size effect, environmental similarity and the service life model were studied. The results showed that improving the strength grade of concrete could improve the durability of concrete, and corrosion inhibitor could slightly improve the durability of concrete. Time-varying law of the deterioration of concrete conformed to the univariate quadratic polynomial. Combined with the concrete damage equivalent theory, a size effect model based on the relative dynamic elastic modulus was proposed and verified, and the size effect coefficient was also given. An environmental similarity model between simulated and practical island and reef environment was proposed. Combined with the reliability theory and the first order second moment method, a new service life model of concrete structure was proposed. The authors were convinced that the research will be advantageous to researchers.
Climate Dynamics - Decadal climate prediction has been one of the most popular topics in recent climate change studies. It is closely linked to our daily life, deeply affecting the wellbeing of... 相似文献
With the goal of investigating the degree at which the MIR luminosity in the Wide-field Infrared Survey Explorer (WISE) traces the SFR, we analyse 3.4, 4.6, 12 and 22 ??m data in a sample of ~140,000 star-forming galaxies or star-forming regions covering a wide range in metallicity 7.66 < 12 + log(O/H)<9.46, with redshiftz?< 0.4. These star-forming galaxies or star-forming regions are selected by matching the WISE Preliminary Release Catalog with the star-forming galaxy Catalog in SDSS DR8 provided by JHU/MPA1?. We study the relationship between the luminosity at 3.4, 4.6, 12 and 22 ??m from WISE and H?? luminosity in SDSS DR8. From these comparisons, we derive reference SFR indicators for use in our analysis. Linear correlations between SFR and the 3.4, 4.6, 12 and 22 ??m luminosity are found, and calibrations of SFRs based on L(3.4), L(4.6), L(12) and L(22) are proposed. The calibrations hold for galaxies with verified spectral observations. The dispersion in the relation between 3.4, 4.6, 12 and 22 ??m luminosity and SFR relates to the galaxy??s properties, such as 4000 ? break and galaxy color. 相似文献
The National Bureau of Surveying and Mapping of China has planned to speed up the development of spatial data infrastructure (SDI) in the coming few years. This SDI consists of four types of digital products, i. e., digital orthophotos, digital elevation models, digital line graphs and digital raster graphs. For the DEM, a scheme for the database building and updating of 1∶10 000 digital elevation models has been proposed and some experimental tests have also been accomplished. This paper describes the theoretical (and/or technical) background and reports some of the experimental results to support the scheme. Various aspects of the scheme such as accuracy, data sources, data sampling spatial resolution, terrain modeling, data organization, etc are discussed. 相似文献