The synthesis of the novel inimer (initiator‐monomer) 4‐(1,2‐oxirane‐isopropyl)styrene EPOIM and the copolymerization of this inimer with isobutylene (IB) to form arborescent polyisobutylene (PIB) is described. Polymerizations were accomplished by use of TiCl4 coinitiator and the effect of reaction conditions was investigated. Size exclusion chromatography (SEC) was used demonstrate EPOIM incorporation across the whole molecular weight distribution. The average number of branch points (B) per chain measured by use of selective link destruction increased with increasing EPOIM/IB ratio and decreased with [TiCl4]. Large scale polymerizations were carried out based on results from small scale polymerizations. Architecture analysis carried out through use of branching parameters based on the radii of gyration Rg and hydrodynamic radii Rh measured by multidetector SEC corroborated the proposed arborescent architecture. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 5847–5856, 2007

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The purpose of this study was to identify and describe experiences of undergraduate extracurricular involvement that result in increased leadership development. Senior students in the College of Agriculture and Life Sciences at Iowa State University completed an online questionnaire about their extracurricular experiences. Leadership development was conceptualized using the social change model. The Socially Responsible Leadership Scale (SRLS-R2) group scale was used to access leadership group values, and the Omnibus SRLS-R2 was used to measure the overall leadership construct. Ninety-six percent of respondents indicated they were involved in an extracurricular activity, including 21% in the Greek system, 95% in clubs and organizations, and 29% in competitive teams. Students who reported serving as an officer of a club or organization and students who reported spending more hours per week in extracurricular clubs and organizations scored significantly higher on both the SRLS-R2 group and an Omnibus SRLS score.

This study examined the relationship between extracurricular involvement and leadership outcomes among traditional-age college seniors in the College of Agriculture and Life Sciences at Iowa State University. We collected data related to quantitative (i.e., how much time a student spends on an activity) and qualitative (i.e., how focused the student is on the activity) aspects of involvement in extracurricular organizations. We measured leadership, as an outcome, using the individual values scale of the Socially Responsible Leadership Scale (SRLS-R2). The number of clubs in which a student participated and served as an officer was associated with higher leadership scores. We identified a threshold of involvement that suggests the optimum number of clubs or organizations to be actively involved in is three to four.

This study examined the relationship between extracurricular involvement and leadership outcomes among traditional-age college seniors in the College of Agriculture and Life Sciences at Iowa State University. Authors collected data related to quantitative and qualitative aspects of involvement in extracurricular organizations. Further, they measured leadership, as an outcome, using the individual values scale of the Socially Responsible Leadership Scale (SRLS-R2). The number of clubs in which a student participated and served as an officer was associated with higher leadership scores. Findings identified a threshold of involvement that suggests the optimum number of clubs or organizations to be actively involved in is three to four. Disciplines Agricultural Education | Educational Assessment, Evaluation, and Research | Educational Leadership | Educational Methods CommentsThis article is from Journal of Leadership Education 12 (2013) AbstractThis study examined the relationship between extracurricular involvement and leadership outcomes among traditional-age college seniors in the College of Agriculture and Life Sciences at Iowa State University. We collected data related to quantitative (i.e., how much time a student spends on an activity) and qualitative (i.e., how focused the student is on the activity) aspects of involvement in extracurricular organizations. We measured leadership, as an outcome, using the individual values scale of the Socially Responsible Leadership Scale (SRLS-R2). The number of clubs in which a student participated and served as an officer was associated with higher leadership scores. We identified a threshold of involvement that suggests the optimum number of clubs or organizations to be actively involved in is three to four.

Summary: This paper discusses the analysis of star-branched and dendritic polyisobutylenes (PIBs) using branching parameters based on radii of gyration R g,z and hydrodynamic radii R h,z . R g,z and R h,z were measured by Size Exclusion Chromatography equipped with a Wyatt Technology Viscostar viscometer (VIS), a Wyatt Optilab DSP RI detector, a Wyatt DAWN EOS 18 angle Multiangle Light Scattering (MALS) detector and a Wyatt Quasi-elastic Light Scattering QELS detector. Branching parameters were calculated from these measurements and compared with those computed for these architectures.

We introduce an inhomogeneously nonlinear Schrödinger lattice, featuring a defocusing segment, a focusing segment and a transitional interface between the two. We illustrate that such inhomogeneous settings present vastly different dynamical behavior in the vicinity of the interface than the one expected in their homogeneous counterparts. We analyze the relevant stationary states, as well as their stability, by means of perturbation theory and linear stability analysis. We find good agreement with the numerical findings in the vicinity of the anticontinuum limit. For larger values of the coupling, we follow the relevant branches numerically and show that they terminate at values of the coupling strength which are larger for more extended solutions. The dynamical development of relevant instabilities is also monitored in the case of unstable solutions.

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