(1)chgrp xiazdong test.txt:将test.txt的文件用户组设置为xiazdong; (2)chgrp xiazdong dir:将dir的文件用户组设置为xiazdong; (3)chown xiazdong test.txt:将test.txt的文件所有者设置为xiazdong; (4)chown xiazdong:root test.txt:将test.txt的文件所有者设置为xiazdong,用户组设置为root;...
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SERS spectra were recorded with a Confocal Raman spectrometer (DXR, GX-PT-2412, Thermo, Waltham, MA, USA) with 780 nm line of a He-Ne laser as excitation wavelength. The laser power at the samples was 24 mW and the data acquisition time was 60 s. R6G and DOX was used as probe ...
The acidification of soils and water has various detrimental effects on plants, animals and ecosystems (e.g., root damage and increased erosion of important nutrients). The observed secondary effects include long-term changes in species composition and the genetic variability of remaining species, ...
Correlation of Technological Parameters of Mechanical Crushing and Screening of Rock Materials used in Road Construction; Wyd Uczelniane Politechniki Szczecin´ skiej: Szczecin, Poland, 1983. (In Polish) 7. Gu, X.; Tran, Y.; Hong, L. Quantification of Coarse Aggregate Shape in Concrete. Front...
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Newcastle upon Tyne NE18ST, UK 2 Department of Information System Engineering, Erbil Technical Engineering College, Erbil Polytechnic University, Erbil, Kurdistan Region 44001, Iraq; Reben.kurda@epu.edu.iq 3 Department of Civil Engineering, Technical Engineering College, Erbil Polytechnic University, Erb...
The empirical model assumes that carbonation depth is proportional to the square root of the carbonization time. Smolczyk established a calculation formula for the concrete carbonization depth and compressive strength based on experimental data and assumed that the carbonation depth was proportional to ...