Wei X.,SUNY Institute of Technology |
Wei H.,West Virginia University |
Viadero R.C.,Western Illinois University
Science of the Total Environment | Year: 2011
Abandoned mine land (AML) is one of the legacies of historic mining activities, causing a wide range of environmental problems worldwide. A stream monitoring study was conducted for a period of 7. years to evaluate the water quality trend in a Mid-Appalachian watershed, which was heavily impacted by past coal mining and subsequently reclaimed by reforestation and revegetation. GIS tools and multivariate statistical analyses were applied to characterize land cover, to assess temporal trends of the stream conditions, and to examine the linkages between water quality and land cover. In the entire watershed, 15.8% of the land was designated as AML reclaimed by reforestation (4.9%) and revegetation (10.8%). Statistic analysis revealed sub-watersheds with similar land cover (i.e. percentage of reclaimed AML) had similar water quality and all tested water quality variables were significantly related to land cover. Based on the assessment of water quality, acid mine drainage was still the dominant factor leading to the overall poor water quality (low pH, high sulfate and metals) in the watershed after reclamation was completed more than 20. years ago. Nevertheless, statistically significant improvement trends were observed for the mine drainage-related water quality variables (except pH) in the reclaimed AML watershed. The lack of pH improvement in the watershed might be related to metal precipitation and poor buffering capacity of the impacted streams. Furthermore, water quality improvement was more evident in the sub-watersheds which were heavily impacted by past mining activities and reclaimed by reforestation, indicating good reclamation practice had positive impact on water quality over time. © 2010.
Levi D.,Third University of Rome |
Thomova Z.,SUNY Institute of Technology |
Winternitz P.,University of Montreal
Journal of Physics A: Mathematical and Theoretical | Year: 2011
We define infinitesimal contact transformations for ordinary difference schemes as transformations that depend on K + 1 lattice points (K ≥ 1) and can be integrated to form a local or global Lie group. We then prove that such contact transformations do not exist. © 2011 IOP Publishing Ltd.
Kahn R.L.,SUNY Institute of Technology
IEEE International Professional Communication Conference | Year: 2015
Research completed for this paper found that an optimal online learning experience should appeal to all of the learning styles of all students. This discussion focuses on how to apply Web-based tools to design courses that appeal to all learning styles beginning with teacher centered learning, moving to more active student involvement in their learning and concluding with the use of student-based teaching techniques. The author's research found that courses should include all learning styles and end with a metacognitive exercise in which students reflect on what they've learned. © 2014 IEEE.
Dziubek A.,SUNY Institute of Technology
Journal of Heat Transfer | Year: 2013
In this paper, we study the continuum physics model equations for condensation (two phase flow problems) in vertical tubes with small diameter and obtain reduced model equations. We found that generalization of dimensional analysis to multiple spatial dimensions is an excellent tool for that purpose, so that a review of this method is also part of the paper. We obtain the nondimensional numbers of the problem and derive reduced bulk and interface equations. The problem is characterized by three length scales, tube radius R, tube length L, and initial film thickness H. For small ratio ε = H/L, we derive a single ordinary differential equation for the condensate film thickness as function of axial position with tube radius as parameter, which agrees well with commonly used (parametric) models from literature. Our model is based on the physical dimensions of the problem which gives a greater geometrical flexibility and a wider range of applicability. We also discuss the effect of surface tension and the limit of the model. Copyright © 2013 by ASME.
Dziubek A.,SUNY Institute of Technology
Meccanica | Year: 2012
The main goal of these notes is to give a review of the equations for two phase flow problems with an interface between the two phases in a selfcontained way, and, in particular, to properly include surface tension into the interface balance equations. © Springer Science+Business Media B.V. 2012.