摘要：The main objective of this research is to assess the existence （or lack） of media concentration in the Portuguese dailies newspaper sector, and to evaluate the extension to which this situation may be compromising fundamental society values： freedom of speech and right of access to information. Authors resorted to market indicators, namely total average circulation,number of copies per issue, business volume and advertising investments. These indicators are found to be complementary： some indicators evaluate group position in the readers＇ market, whereas other evaluates group position in the general market and the advertising market in particular. Based in this market information, we used quantitative models （HII, CR4 and Noan） to measure de concentration in the newspaper segment. Additionally we tried to demonstrate that to analyze the dailies newspaper concentration situation in Portugal a holist perspective of the media market is needed, using a country context to understand some local characteristics and market structure and political, economic, social and technological dynamics. Additionally, there are evidences that existing concentration indexes are not conclusive because of potential replacement effects in the Portuguese media sector.

摘要：[Objective] The research aimed to provide basic files and theoretical guidance for constructing sluicing-siltation dam using soil with high clay content soil.[Method] The soils of Dagou basin near Xiwu Village of Baishui County,Shaanxi Province were taken as experimental *** pipes with same height and diameter were used to construct testing model for dynamically determining settlement,shear strength,wet density of grouting bulk under 2 different grouting speeds(15 cm/d and 25 cm/d).[Result] Under different grouting speeds,general change trend was similar during grouting *** subsidence,deformation,shear strength and wet density increased with the increase of grouting *** or six days after grouting,daily displacement under 25 cm/d grouting speed was fewer than that under 15 cm/d grouting speed.[Conclusion] The increase of grouting speed could shorten the time for reaching the same subsidence,deformation,shear strength and wet density and increased displacement at the initial stage of grouting,however,with the increase of grouting time,lower grouting bulk was bad for displacement at later grouting period because it was near impermeable layer.