Organic photovoltaic (OPV) cells have recently undergone a rapid increase in power conversion efficiency (PCE) under AM1.5G conditions, as certified by the National Renewable Energy Laboratory (NREL), which jumped from 11.5% October 2017 to 18.2% December 2020. However, NREL PCE of large area OPV modules is still lagging far behind (11.7% July 2020). Additionally, there has been rapidly growing...

Due to low counts in an (111)In single photon emission computed tomography (SPECT) scan, a large part of the head was missing in the reconstructed images on Philips Extended Brilliance Workspace (EBW) and IntelliSpace Portal (ISP) workstations. This problem occurred for the ordered subsets expectation maximization (OSEM) algorithm with and without resolution recovery (Astonish), but not for fil...

BACKGROUND Long-term human exposure to ambient pollutants can be an important contributing or etiologic factor of many chronic diseases. Spatiotemporal estimation (mapping) of long-term exposure at residential areas based on field observations recorded in the U.S. Environmental Protection Agency's Air Quality System often suffer from missing data issues due to the scarce monitoring network acro...

Purpose This paper aims to consider a multiscale electromagnetic wave problem for housing with ventilation grill. Using the standard finite element method discretise apertures leads an unduly large number of unknowns. An efficient approach simulate multiple scales is introduced. The aim significantly reduce computational costs. Design/methodology/approach A domain decomposition technique upscal...

We review some of our recent efforts in developing upscaling methods for simulating the flow transport through heterogeneous porous media. In particular, the steady flow transport through highly heterogeneous porous media driven by extraction wells and the flow transport through unsaturated porous media will be considered. Mathematics subject classification: 65F10, 65F30.

Upscaling reflectance information of lichens and mosses using a singularity index: a case study of the Hudson Bay Lowlands, Canada T. Neta, Q. Cheng, R. L. Bello, and B. Hu Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada Department of Earth and Space Sciences and Engineering, York University, Toronto, Ontario, Canada Department of Geography, York U...