IslandScholar
Not a member yet
16367 research outputs found
Sort by
Using responsive evaluation in strategic management
No full textProgram and policy evaluation is a key component of strategic management. Managers and other leaders need to know
“what works” to determine if strategic priorities are being achieved. In the 21st century, managers are required to have a
broad range of knowledge and skill sets to support business development and to establish and maintain strategic priorities. In
our efforts to ensure that our evaluative work is “evidence-based” and “scientific” we may overlook those evaluative
approaches and models which do not necessarily align with the traditional, positivist approach to program and policy
evaluation. Managers should be aware of alternative approaches to program and policy evaluation to ensure that methods are
able to capture the complexity of the social phenomenon which is inherent to every program and policy. This paper makes a
case for using Responsive Evaluation and provides an overview of its development, application, and strengths
Thermochemical modeling of a hydrolysis moving bed reactor in the Cu-Cl cycle of hydrogen production
No full textThis study focuses on simulating the hydrolysis step of the Copper-Chlorine (Cu-Cl) Cycle in a moving bed reactor (MBR). The
hydrolysis reaction is one of three reactions in the Cu-Cl cycle for hydrogen production. Several recent studies have highlighted
fluidized bed reactors as a promising reactor for this reaction, with lab scale studies ongoing. However, a potential alternative
reactor system, to decrease associated costs and energy requirements of high steam to copper ratios, is an MBR. Alternative
heterogeneous MBRs have been successful in reducing steam requirements in steam gasification of coal and biomass. These
operations demonstrate comparable reaction models to the hydrolysis reaction, which indicate the potential of moving bed reactors
as an attractive alternative for the process. Simulation of MBRs can be used as a tool to establish the feasibility and design of a lab
scale and scaled up MBR, however, there are no current models for this reaction system. This reactor model uses the Shrinking
Core Model (SCM) for heterogenous reactions, reaction kinetics, and mass and energy balances, to represent the system. The
resulting simulation is first validated by established reaction system / data and then applied to the Cu-Cl system. The model is then
used to investigate whether a series of MBRs could improve the steam to copper ratio and conversion of the hydrolysis reaction, as
well as the overall cycle efficiency
Exergy analysis and environmental impact assessment of using various refrigerants for hybrid electric vehicle thermal management systems
No full textThermal management systems (TMSs) are one of the key components of hybrid electric vehicles in terms of their impact on vehicle efficiency and performance, as well as the vehicle’s environmental footprint. In this chapter, an environmental assessment of hybrid electric vehicle thermal management systems is developed with respect to various refrigerants such as R134a, R600 (butane), R600a (isobutane), R1234yf (tetrafluoropropene) and dimethyl ether (DME). The energetic and exergetic COPs along with exergy destruction rates are analyzed for the TMS using each refrigerant. Also, greenhouse gas (GHG) emissions (in g CO2-eq/kWh) during operation and the sustainability index are determined under various system parameters, operating conditions, as well as carbon dioxide scenarios. Based on the results, all selected TMSs are determined to have higher energetic and exergetic COPs along with lower environmental impact than the baseline TMS (which uses R134a) except for the TMS using R1234yf. The highest efficiency and lowest environmental impact are achieved by TMS using DME with higher energetic and exergetic COPs (by 7.9 and 8.2 %, respectively) and lower GHG emissions (by 8.3 %) and higher sustainability index (by 3.3 %) than the baseline TMS
Reflections and lessons learned in developing a National Aboriginal substance abuse treatment program
No full text
Mass transfer and bubble flow dynamics in aqueous solutions for hydrogen production cycles
No full textThe hydrogen economy is one potential avenue to a clean energy system, and a promising option for hydrogen production is thermochemical water decomposition. This process involves multiple steps, some consisting of multiphase reaction systems. Here, the thermodynamics and kinetics of vapour diffusion and entrainment for ascending bubbles in a vertical column are examined through experimental studies for various gas production rates. The vapour entrainment is interpreted in terms of the phase transition rate, and its dependence on such operating parameters as gas bubble size, liquid depth, temperature, pressure and concentration is examined. These effects are investigated experimentally, and a phase transition correlation is developed to analyze these parameters. Also, a predictive model is developed to simulate the physical processes of bubble transport in a vertical liquid column, as it occurs in water splitting processes such as oxygen generation in the copper-chlorine thermochemical cycle, as well as hydrogen generation in electrolytic and photocatalytic processes