Leadership and Learning in Information System Development Project Team

In addition to traditional vertical leadership, the importance of shared leadership in teams has been highlighted recently. However, despite the growing interest in team leadership, researchers pay limited attention to the relationship between specific leadership styles and learning types in teams. This paper addresses this gap by proposing a theoretical model to answer the question: “How vertical and shared team leadership styles affect exploration and exploitation of team learning?” In addition to argue the impact of leadership on both types of learning, we further hypothesize a contingency relationship between learning types and leadership styles

Team Leadership and Diversity Management in Information Systems Development Project Teams

Background: The interplay of diversity and leadership produces mixed findings in the literature. Based on the categorization-elaboration model (CEM) and diversity management (DM) literature, this study investigates the role of team leadership in a diverse ISD team. Further, this study examines the moderating roles of DM practices in the relationships between group diversity, team leadership, and project performance. Method: This study selected a paired survey method to test the hypotheses. Eighty-two valid paired questionnaires were received from project managers and team members in ISD projects. In addition, this study used partial least squares (PLS) with a bootstrapping technique to examine the proposed model. Results: The results show that group diversity has mixed impacts on team leadership. Furthermore, DM practices positively moderate the effect of value diversity on team leadership, as value diversity is positively related to team leadership when DM practices are more robust. At last, DM practices negatively moderate the relationship between team leadership and project performance as the effect of team leadership has weaker effects on project performance when DM practices are strong than when the practices are weak. Conclusion: This study adds to the literature by examining team leadership in a heterogenous ISD team and providing empirical evidence for the moderating roles of DM practices in team leadership processes

Cycling performance of Mn2O3 porous nanocubes and hollow spheres for lithium-ion batteries

Post presentationMn2O3 is a promising anode material for lithium ion battery. Two different kinds of structures of Mn2O3 were synthesized via solution processes, the Mn2O3 porous cubes and hollow spheres. Scanning electron microscope images and transmission electron microscopy images clearly show the structures. Electrochemical impedance spectroscopy and cyclic voltammetry measurements were used to characterize their electrochemical properties. As anode materials for lithium ion batteries, Mn2O3 porous cubes performed similarly as Mn2O3 hollow spheres. Both samples started with high initial capacities (1583.2 mAh/g and 1550.7 mAh/g) which were reduced to 173.3 mAh/g and 162.0 mAh/g at 100th cycle at a current density of 100 mA/g. The decrease is likely due to morphology destruction the materials in charging and discharging process.published_or_final_versio

Template-free synthesis of hierarchical hollow V2O5 microspheres with highly stable lithium storage capacity

Hollow V2O5 microspheres were successfully synthesized by a solvothermal method and subsequent calcination. The rigid hollow V2O5 cathode prepared in isopropanol solvent exhibited excellent cycling performance and rate capability. Within a voltage window of 2.5 to 4 V, a maximum specific discharge capacity of 128 mA h g−1 was delivered at 1 A g−1. Even after 500 cycles, the capacity retention was 92.2%.published_or_final_versio

Parametric study on the regeneration heat requirement of an amine-based solid adsorbent process for post-combustion carbon capture

The thermal energy required for regeneration of CO2-rich adsorbents or absorbents is usually regarded as the most important criterion to evaluate different materials and processes for application in commercialscale CO2 capture systems. It is expected that the regeneration heat can be greatly reduced by replacing the mature aqueous monoethanolamine (MEA) technology with amine-based solid adsorbents capturing systems, due to the much lower heat capacity of solid adsorbents comparing to aqueous MEA and the avoidance of evaporating a large amount of water in the regenerator. Comparing to the MEA technology, the regeneration heat for solid adsorbent based systems has not received adequate attention especially on the impacts of process related parameters. Further, the methodologies used in previous investigations to calculate the regeneration heat may have deficiencies in defining the working capacities, adopting proper heat recovery strategies and/or evaluating the effect of moisture co-adsorption. In this study, an energy equation to calculate the regeneration heat has been revised and proposed to systematically evaluate the most important parameters affecting the regeneration heat, including the physical properties of the adsorbents and process related variables including the heat of adsorption, specific heat capacity, working capacity, moisture adsorption of the polyethyleneimine (PEI)/silica adsorbent, the swing temperature difference and the degree of heat recovery. Based on the parametric analysis, the calculated regeneration heat for the PEI/silica adsorbent based system is found to be around 2.46 GJ/tCO2, which is much lower than the value of 3.9 GJ/tCO2 for a typical aqueous MEA system and is also lower than 3.3 GJ/tCO2 for an advanced MEA system. Sensitivity analysis of all the parameters has also been conducted and the results have shown that working capacity, moisture adsorption and heat recovery ratios are the most influential factors. With more proficiency and development in the energy efficient process designs, the advantages of a solid adsorbent based capturing system over typical MEA systems will be justified