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Since the first commercial projects, the development of vertical-axis wind turbines (VAWTs) has been impeded by the limited understanding and inability to accurately model VAWTs. This paper investigates and compares different aerodynamic modelling techniques for VAWTs in 3D. All considered models are using the same blade-element characteristics but use different descriptions to determine the induced velocity field. The H-and Φ-rotor are studied with various aspect ratios and rotor loadings. Both instantaneous azimuthal parameters as well as integral parameters, such as the thrust and power are investigated. The paper concludes that capturing the 3D effects of VAWTs is challenging and the trends to be expected are not straightforward due to the complex vortex system created by VAWTs. All model assumptions affect the results both at the mid-plane of the rotor as well as at the blade tips.

Organizations are downsizing, challenging their employees to "do more with less." Projects teams and work groups being formed to accomplish this goal are being supported with a new type of technology called Group Support Systems (GSS). This research was concerned with determining the major factors that affect the diffusion of GSS in organizations. GroupSystems (GS) is the GSS that was researched. A survey methodology was used to collect data. The model for this research was developed from existing models in diffusion research, from prior MIS research on GroupSystems, and from prior MIS implementation research. The following independent variables were analyzed: the role of the internal champion, the role of the facilitator, average size of the work groups and the percentage of work that was handled by each work group, hourly charge for using GS, total amount of money invested in the technology, and the role of communication channels within the organization. The data were analyzed through four different regressions, with the same results being obtained each time. Significant relationships were found for the size of work groups, the hourly charge rate, and the amount spent on the technology; findings for the role of the facilitator were partially significant. The final regression was significant at the p<.001 level and accounted for over 58% of the model.

The Ladies' repository: a monthly periodical, devoted to literature, arts, and religion. / Volume 25, Issue 5, Page(s) 265-267, (dlps) volume: acg2248.1-25.005, (dlps) article: acg2248.1-25.005:5, http://quod.lib.umich.edu/t/text/accesspolicy.html

The Ladies' repository: a monthly periodical, devoted to literature, arts, and religion. / Volume 5, Issue 1, Page(s) 45-49, (dlps) volume: acg2248.2-05.001, (dlps) article: acg2248.2-05.001:20, http://quod.lib.umich.edu/t/text/accesspolicy.html

The Ladies' repository: a monthly periodical, devoted to literature, arts, and religion. / Volume 25, Issue 12, Page(s) 740-743, (dlps) volume: acg2248.1-25.012, (dlps) article: acg2248.1-25.012:23, http://quod.lib.umich.edu/t/text/accesspolicy.html

The Ladies' repository: a monthly periodical, devoted to literature, arts, and religion. / Volume 23, Issue 7, Page(s) 432-435, (dlps) volume: acg2248.1-23.007, (dlps) article: acg2248.1-23.007:21, http://quod.lib.umich.edu/t/text/accesspolicy.html

The Ladies' repository: a monthly periodical, devoted to literature, arts, and religion. / Volume 22, Issue 1, Page(s) 48-49, (dlps) volume: acg2248.1-22.001, (dlps) article: acg2248.1-22.001:32, http://quod.lib.umich.edu/t/text/accesspolicy.html

The Ladies' repository: a monthly periodical, devoted to literature, arts, and religion. / Volume 19, Issue 2, Page(s) 94-96, (dlps) volume: acg2248.1-19.002, (dlps) article: acg2248.1-19.002:15, http://quod.lib.umich.edu/t/text/accesspolicy.html

The Ladies' repository: a monthly periodical, devoted to literature, arts, and religion. / Volume 17, Issue 1, Page(s) 14-15, (dlps) volume: acg2248.1-17.001, (dlps) article: acg2248.1-17.001:9, http://quod.lib.umich.edu/t/text/accesspolicy.html

The Ladies' repository: a monthly periodical, devoted to literature, arts, and religion. / Volume 21, Issue 1, Page(s) 31-32, (dlps) volume: acg2248.1-21.001, (dlps) article: acg2248.1-21.001:22, http://quod.lib.umich.edu/t/text/accesspolicy.html