Decision-making style as a factor in the selection of task-group coordinator

To date, emergent leadership literature has not clearly indicated what variables influence group members\u27 perception and subsequent selection of a group leader. One approach to the study of this problem has been to analyze group members\u27 verbal behavior to identify empirically behaviors which are more frequent among leaders than nonleaders within a task group. The basic assumption underlying this approach appears to be that a group selects as its leader that individual from the group who most frequently exhibits some specific leadership behavior(s). The literature indicates, however, that this approach has been misleading and inconclusive. For example, in an early study in this tradition, task-group members\u27 behaviors were monitored and classified into 53 categories (Carter, Haythorn, Shriner, & Lanzetta, 1950)* Appointed and emergent leaders\u27 frequencies of behaviors in the content categories were then compared to the frequencies of follower behaviors. Many differences were apparent, and Carter et al. concluded that both appointed and emergent leaders made more interpretations about the situation and gave more information concerning the conduct of the group\u27s activities than did their fellow group members

Relationship of Federal Common Law and Federal Regulatory Statutes, City of Milwaukee v. Illinois and Michigan

In City of Milwaukee v. Illinois and Michigan, the United States Supreme Court vacated the judgment of the court of appeals and remanded the case, holding that the Federal Water Pollution Control Act Amendments of 1972 had indeed displaced the federal common law action authorized by the Court before the 1972 Amendments were enacted. The environmental law ramifications of this decision are significant. However, of greater significance is the Court\u27s attempt in Milwaukee to efface some of the uncertainty surrounding the federal common law, and to elucidate the relationship between federal regulatory statutes and federal common law

An Introductory Examination of the Racketeer Influenced and Corrupt Organizations Act,

This comment will attempt to serve as an introduction to RICO, addressed to those with little or no knowledge of either its provisions and intricacies, or its potential usefulness and adaptability as a prosecution tool. The recent criticism of RICO by the American Bar Association will also be reviewed, as well as the ABA\u27s proposed amendments to RICO. Finally, the state RICO statutes will be discussed. The advantages they offer states currently without any substantive laws dealing directly and primarily with organized and white-collar crime will be examined

Towards an institutional PLE

PLEs in their broader sense (the ad-hoc, serendipitous and potentially chaotic set of tools that learners bring to their learning) are increasingly important for learners in the context of formal study. In this paper we outline the approach that we are taking at the University of Southampton in redesigning our teaching and learning infrastructure into an Institutional PLE. We do not see this term as an oxymoron. We define an Institutional PLE as an environment that provides a personalised interface to University data and services and at the same time exposes that data and services to a student’s personal tools. Our goal is to provide a digital platform that can cope with an evolving learning and teaching environment, as well as support the social and community aspects of the institution

QSO hosts and environments at z=0.9 to 4.2: JHK images with adaptive optics

We have observed nine QSOs with redshifts 0.85 to 4.16 at near-IR wavelengths with the adaptive optics bonnette of the Canada-France-Hawaii telescope. Exposure times ranged from 1500 to 24000s (mostly near 7000s) in J, H, or K bands, with pixels 0.035 arcsec on the sky. The FWHM of the co-added images at the location of the quasars are typically 0.16 arcsec. Including another QSO published previously, we find associated QSO structure in at least eight of ten objects, including the QSO at z = 4.16. The structures seen in all cases include long faint features which appear to be tidal tails. In four cases we have also resolved the QSO host galaxy, but find them to be smooth and symmetrical: future PSF removal may expand this result. Including one object previously reported, of the nine objects with more extended structure, five are radio-loud, and all but one of these appear to be in a dense small group of compact galaxy companions. The radio-quiet objects do not occupy the same dense environments, as seen in the NIR. In this small sample we do not find any apparent trends of these properties with redshift, over the range 0.8 < z < 2.4. The colors of the host galaxies and companions are consistent with young stellar populations at the QSO redshift. Our observations suggest that adaptive optic observations in the visible region will exhibit luminous signatures of the substantial star-formation activity that must be occurring.Comment: 22 pages including 10 tables, plus 11 figures. To appear in A

The effect of plasma density and emitter geometry on space charge limits for field emitter array electron charge emission into a space plasma

Field Emitter Array Cathodes (FEACs) are a new technology being developed for several potential spacecraft electron emission and charge control applications. Instead of a single hot (i.e., high powered) emitter, or a gas dependant plasma contactor, FEAC systems consist of many (hundreds or thousands) of small (micron level) cathode/gate pairs printed on a semiconductor wafer that effect cold field emission at relatively low voltages. Each individual cathode emits only micro-amp level currents, but a functional array is capable of amp/cm2 current densities. It is hoped that thus FEAC offers the possibility of a relatively low-power, simple to integrate, and inexpensive technique for the high level of current emissions that are required for an electrodynamic tether (EDT) propulsion mission. Space charge limits are a significant concern for the EDT application. Vacuum chamber tests and PIC simulations are being performed at the University of Michigan Plasmadynamics and Electric Propulsion Laboratory and Space Physics Research Laboratory to determine the effect of plasma density and emitter geometry on space charge limitations. The results of this work and conclusions to date of how to best mitigate space charge limits will be presented. © 2001 American Institute of Physics.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87359/2/467_1.pd

On the move:Exploring the impact of residential mobility on cannabis use

AbstractA large literature exists suggesting that residential mobility leads to increased participation in risky health behaviours such as cannabis use amongst youth. However, much of this work fails to account for the impact that underlying differences between mobile and non-mobile youth have on this relationship. In this study we utilise multilevel models with longitudinal data to simultaneously estimate between-child and within-child effects in the relationship between residential mobility and cannabis use, allowing us to determine the extent to which cannabis use in adolescence is driven by residential mobility and unobserved confounding. Data come from a UK cohort, The Avon Longitudinal Study of Parents and Children. Consistent with previous research we find a positive association between cumulative residential mobility and cannabis use when using multilevel extensions of conventional logistic regression models (log odds: 0.94, standard error: 0.42), indicating that children who move houses are more likely to use cannabis than those who remain residentially stable. However, decomposing this relationship into within- and between-child components reveals that the conventional model is underspecified and misleading; we find that differences in cannabis use between mobile and non-mobile children are due to underlying differences between these groups (between-child log odds: 3.56, standard error: 1.22), not by a change in status of residential mobility (within-child log odds: 1.33, standard error: 1.02). Our findings suggest that residential mobility in the teenage years does not place children at an increased risk of cannabis use throughout these years