Question: How does competition between quaking aspen (Populus tremuloides) and white fir (Abies concolor) affect growth and spatial pattern of each species? Location: The northern Sierra Nevada, California, USA. Methods: In paired plots in mixed aspen(n5 3) or white fir-dominated (n5 2) stands, we mapped trees and saplings and recorded DBH, height, species, and condition and took increment core...

The direct (with air) gasification process of biomass in bubbling fluidized bed reactor was simulated using Aspen Plus®. divided three parts: the pyrolysis zone, combustion zone and reduction zone. simulation supported by an external MS-Excel® subroutine to define yield composition main components, namely, char, gas tar. Whereas processes were a kinetic model. These models calibrated thereafter...

The development of tools for the synthesis, design, and optimization biorefineries requires deep knowledge thermochemical processes involved in these schemes. For this project, three models from scientific literature were implemented to simulate processes: fast pyrolysis a fluidized bed, fixed-bed, fluidized-bed gasification using Aspen PlusTM software. These allow user obtain performance, cons...

This study presents a reliable model using Aspen Plus process simulator capable of performing sensitivity analysis the downdraft gasification linked to hydrogen production unit. Effects key factors, including temperature and steam biomass ratio (SBR) on syngas composition, calorific value are discussed then optimal conditions for maximum extracted. The is validated by experimental other modelin...