University of North Carolina at Charlotte

About: University of North Carolina at Charlotte is a education organization based out in Charlotte, North Carolina, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 8772 authors who have published 22239 publications receiving 562529 citations. The organization is also known as: UNC Charlotte & UNCC.

A meta-analytic review of authentic and transformational leadership: A test for redundancy

Abstract: While authentic leadership (AL) has seen a dramatic increase in scholarly attention over the last decade, its contribution relative to more established leadership constructs merits investigation. We employ meta-analytic techniques to compare AL and transformational leadership theories using 100 independent samples and 25,452 individuals. The findings reveal that (1) the relationship between authentic and transformational leadership is large in magnitude, suggesting construct redundancy (ρ = .72); (2) neither AL nor transformational leadership add noticeable incremental validity beyond the other construct; (3) AL has a lower relative weight than transformational leadership for the outcomes of follower satisfaction, follower satisfaction with the leader, task performance, and leader effectiveness; and (4) AL demonstrates dominance over transformational leadership when predicting group or organization performance and organizational citizenship behaviors. We recommend future research examine AL at the component level and its relationships with related ethical constructs to potentially differentiate it from transformational leadership.

The Economic Value of Volatility Timing using 'Realized' Volatility

Abstract: Recent work suggests that intradaily returns can be used to construct estimates of daily return volatility that are more precise than those constructed using daily returns. We measure the economic value of this "realized" volatility approach in the context of investment decisions. Our results indicate that the value of switching from daily to intradaily returns to estimate the conditional covariance matix can be substantial. We estimate that a risk-averse investor would be willing to pay 50 to 200 basis points per year to capture the observed gains in portfolio performance. Moreover,these gains are robust to transaction costs, estimation risk regarding expected returns, and the performance measurement horizon.

Petrological and tectonic segmentation of the East Pacific Rise, 5°30′–14°30′ N

Abstract: Lavas from the fast-spreading East Pacific Rise are geochemically diverse even within a single tectonically defined spreading cell. Within such spreading cells, small offsets of the rise axis are often boundaries between petrologically distinct magmatic units which must be supplied independently from beneath the ocean crust. Volcanics erupted near the small offsets can have chemical characteristics similar to those previously found near transform faults.

Legacy and Emerging Perfluoroalkyl Substances Are Important Drinking Water Contaminants in the Cape Fear River Watershed of North Carolina

Abstract: Long-chain per- and polyfluoroalkyl substances (PFASs) are being replaced by short-chain PFASs and fluorinated alternatives. For ten legacy PFASs and seven recently discovered perfluoroalkyl ether carboxylic acids (PFECAs), we report (1) their occurrence in the Cape Fear River (CFR) watershed, (2) their fate in water treatment processes, and (3) their adsorbability on powdered activated carbon (PAC). In the headwater region of the CFR basin, PFECAs were not detected in raw water of a drinking water treatment plant (DWTP), but concentrations of legacy PFASs were high. The U.S. Environmental Protection Agency’s lifetime health advisory level (70 ng/L) for perfluorooctanesulfonic acid and perfluorooctanoic acid (PFOA) was exceeded on 57 of 127 sampling days. In raw water of a DWTP downstream of a PFAS manufacturer, the mean concentration of perfluoro-2-propoxypropanoic acid (PFPrOPrA), a replacement for PFOA, was 631 ng/L (n = 37). Six other PFECAs were detected, with three exhibiting chromatographic peak ar...