Ground movements due to longwall mining operations have the potential to damage the hydrological balance within as well as outside the mine permit area in the form of increased surface ponding and changes to hydrogeol...Ground movements due to longwall mining operations have the potential to damage the hydrological balance within as well as outside the mine permit area in the form of increased surface ponding and changes to hydrogeological properties. Recently, the Office of Surface Mining, Reclamation and Enforcement(OSMRE) in the USA, has completed a public comment period on a newly proposed rule for the protection of streams and groundwater from adverse impacts of surface and underground mining operations(80 FR 44435). With increased community and regulatory focus on mining operations and their potential to adversely affect streams and groundwater, now there is a greater need for better prediction of the possible effects mining has on both surface and subsurface bodies of water. With mining induced stress and strain within the overburden correlated to changes in the hydrogeological properties of rock and soil, this paper investigates the evaluation of the hydrogeological system within the vicinity of an underground mining operation based on strain values calculated through a surface deformation prediction model. Through accurate modeling of the pre- and post-mining hydrogeological system, industry personnel can better depict mining induced effects on surface and subsurface bodies of water aiding in the optimization of underground extraction sequences while maintaining the integrity of water resources.展开更多
In a case study investigating Chinese EFL university majors＇ perceptions of a portfolio-based writing assessment （PBWA） project, English majors were sampled to find out whether the portfolio method made them more i...In a case study investigating Chinese EFL university majors＇ perceptions of a portfolio-based writing assessment （PBWA） project, English majors were sampled to find out whether the portfolio method made them more interested in writing and/or improved their writing process and writing strategies. Four sophomores were chosen from among an experimental group at a local university in China. Analysis of data from student journals, interviews and reflective essays showed that taking part in portfolio writing empowered them to take charge of their own learning and motivated them to write better. The students welcomed PBWA as a fairer assessment tool than timed, one-shot essay tests. They held more interest in English writing, improved their writing strategies and shifted their attention from products of writing to process of writing and, thus, preferred scores from PBWA as a more satisfactory indicator of their writing ability.展开更多
基金sponsored by the Appalachian Research Initiative for Environmental Science(ARIES)
文摘Ground movements due to longwall mining operations have the potential to damage the hydrological balance within as well as outside the mine permit area in the form of increased surface ponding and changes to hydrogeological properties. Recently, the Office of Surface Mining, Reclamation and Enforcement(OSMRE) in the USA, has completed a public comment period on a newly proposed rule for the protection of streams and groundwater from adverse impacts of surface and underground mining operations(80 FR 44435). With increased community and regulatory focus on mining operations and their potential to adversely affect streams and groundwater, now there is a greater need for better prediction of the possible effects mining has on both surface and subsurface bodies of water. With mining induced stress and strain within the overburden correlated to changes in the hydrogeological properties of rock and soil, this paper investigates the evaluation of the hydrogeological system within the vicinity of an underground mining operation based on strain values calculated through a surface deformation prediction model. Through accurate modeling of the pre- and post-mining hydrogeological system, industry personnel can better depict mining induced effects on surface and subsurface bodies of water aiding in the optimization of underground extraction sequences while maintaining the integrity of water resources.
基金part achievements of the project "Reform of Reading-to-writing courses of English Major" supported by Guangdong Province Higher Educational Reform Essential Project(2013)the education reform project of Southern Medical University
文摘In a case study investigating Chinese EFL university majors＇ perceptions of a portfolio-based writing assessment （PBWA） project, English majors were sampled to find out whether the portfolio method made them more interested in writing and/or improved their writing process and writing strategies. Four sophomores were chosen from among an experimental group at a local university in China. Analysis of data from student journals, interviews and reflective essays showed that taking part in portfolio writing empowered them to take charge of their own learning and motivated them to write better. The students welcomed PBWA as a fairer assessment tool than timed, one-shot essay tests. They held more interest in English writing, improved their writing strategies and shifted their attention from products of writing to process of writing and, thus, preferred scores from PBWA as a more satisfactory indicator of their writing ability.
