An Identity-Based Approach to Social Enterprise

Social enterprise has gained widespread acclaim as a tool for addressing social and environmental problems. Yet because social enterprises integrate social welfare and commercial logics, they face the challenge of pursuing frequently conflicting goals. Studies have begun to address how established social enterprises can manage these tensions, but we know little about how, why, and with what consequences social entrepreneurs mix competing logics as they create new organizations. To address this gap, we develop a theoretical model based in identity theory that helps to explain (1) how commercial and social welfare logics become relevant to entrepreneurship, (2) how different types of entrepreneurs perceive the tension between these logics, and (3) what implications this has for how entrepreneurs recognize and develop social enterprise opportunities. Our approach responds to calls from organizational and entrepreneurship scholars to extend existing frameworks of opportunity recognition and development to better account for social enterprise creation

Converging Winds: Logic Hybridization in the Colorado Wind Energy Field

This study explores the hybridization of field-level logics, a process that integrates previously incompatible logics within an organizational field. Through an inductive study of the wind energy field in Colorado, we find that logic hybridization resulted when social movement organizations, incumbent firms, and policy makers variously responded to incompatibility between economizing and ecologizing logics. Compromise and framing efforts catalyzed social movements to alter the balance of power in the field, which transformed the relationship between field logics. Hybrid organizations then emerged to establish, legitimize, and embed a new set of inter-linked frames, practices, and arrangements that integrated previously incompatible logics. Incumbent firms and policy makers further formalized and embedded the new hybridized logic in the field. Our findings suggest that the hybridization of field level logics is a complex process in which organizational actions and field-level conditions recursively influence each other over time

Values-Based Rivalry: A Theoretical Framework of Rivalry Between Activists and Firms

In this article we develop a theoretical framework to explain values-based rivalry between activists and firms by integrating and advancing key insights from competitive dynamics and social activist research. The first part of our framework conceptualizes the unique tensions, actions, and responses that characterize values-based rivalry and distinguish it from rivalry between firms. The second part of our framework conceptualizes the role of managers’ perceptions in shaping their firms’ likelihood of responding to activists’ actions during values-based rivalry. Overall, our conceptualization primarily expands competitive dynamics research to account for rivalry between dissimilar actors and, in doing so, broadens social activist research to account for such rivalry

The evolution of founder identity as an authenticity work process

Research has shown founders' identities have a significant impact on their ventures. Yet, the process through which founder identity evolves and takes shape remains relatively unexplained. This paper explores the evolution of founder identity through a qualitative study of first-time sustainable entrepreneurs, and their stakeholders, over a three years period. Our analysis revealed the importance of personal identity, the aspect of the self that defines a person as a unique individual based largely on values and beliefs. We found that first-time founders sought to align their personal identity with their evolving founder identity over time. Based on these findings we theorize a process model of founder authenticity work, defined as the activities founders engage in to feel and seem authentic while engaged in entrepreneurial action. This study thus details the significance of personal identity as a guidepost for founder identity evolution, complementing extant founder identity studies focused on role and social identities. In addition, our analysis enriches the current conceptualization of authenticity in entrepreneurship research by linking it to validation of personal identity and highlighting its negotiated nature in the evolution of authentic founder identities

CD56negCD16+ NK cells are activated mature NK cells with impaired effector function during HIV-1 infection

BACKGROUND: A subset of CD3(neg)CD56(neg)CD16⁺ Natural Killer (NK) cells is highly expanded during chronic HIV-1 infection. The role of this subset in HIV-1 pathogenesis remains unclear. The lack of NK cell lineage-specific markers has complicated the study of minor NK cell subpopulations. RESULTS: Using CD7 as an additional NK cell marker, we found that CD3(neg)CD56(neg)CD16⁺ cells are a heterogeneous population comprised of CD7⁺ NK cells and CD7(neg) non-classical myeloid cells. CD7⁺CD56(neg)CD16⁺ NK cells are significantly expanded in HIV-1 infection. CD7⁺CD56(neg)CD16⁺ NK cells are mature and express KIRs, the C-type lectin-like receptors NKG2A and NKG2C, and natural cytotoxicity receptors similar to CD7⁺CD56⁺CD16⁺ NK cells. CD7⁺CD56(neg) NK cells in healthy donors produced minimal IFNγ following K562 target cell or IL-12 plus IL-18 stimulation; however, they degranulated in response to K562 stimulation similar to CD7⁺CD56⁺ NK cells. HIV-1 infection resulted in reduced IFNγ secretion following K562 or cytokine stimulation by both NK cell subsets compared to healthy donors. Decreased granzyme B and perforin expression and increased expression of CD107a in the absence of stimulation, particularly in HIV-1-infected subjects, suggest that CD7⁺CD56(neg)CD16⁺ NK cells may have recently engaged target cells. Furthermore, CD7⁺CD56(neg)CD16⁺ NK cells have significantly increased expression of CD95, a marker of NK cell activation. CONCLUSIONS: Taken together, CD7⁺CD56(neg)CD16⁺ NK cells are activated, mature NK cells that may have recently engaged target cells

Photometric redshifts from reconstructed QSO templates

From SDSS commissioning photometric and spectroscopic data, we investigate the utility of photometric redshift techniques to the task of estimating QSO redshifts. We consider empirical methods (e.g. nearest-neighbor searches and polynomial fitting), standard spectral template fitting and hybrid approaches (i.e. training spectral templates from spectroscopic and photometric observations of QSOs). We find that in all cases, due to the presence of strong emission-lines within the QSO spectra, the nearest-neighbor and template fitting methods are superior to the polynomial fitting approach. Applying a novel reconstruction technique, we can, from the SDSS multicolor photometry, reconstruct a statistical representation of the underlying SEDs of the SDSS QSOs. Although, the reconstructed templates are based on only broadband photometry the common emission lines present within the QSO spectra can be recovered in the resulting spectral energy distributions. The technique should be useful in searching for spectral differences among QSOs at a given redshift, in searching for spectral evolution of QSOs, in comparing photometric redshifts for objects beyond the SDSS spectroscopic sample with those in the well calibrated photometric redshifts for objects brighter than 20th magnitude and in searching for systematic and time variable effects in the SDSS broad band photometric and spectral photometric calibrations.Comment: 21 pages, 9 figures, LaTeX AASTeX, submitted to A

Black Hole Data via a Kerr-Schild Approach

We present a new approach for setting initial Cauchy data for multiple black hole spacetimes. The method is based upon adopting an initially Kerr-Schild form of the metric. In the case of non-spinning holes, the constraint equations take a simple hierarchical form which is amenable to direct numerical integration. The feasibility of this approach is demonstrated by solving analytically the problem of initial data in a perturbed Schwarzschild geometry.Comment: 13 pages, RevTeX forma

High-Redshift Quasars Found in Sloan Digital Sky Survey Commissioning Data IV: Luminosity Function from the Fall Equatorial Stripe Sampl

This is the fourth paper in a series aimed at finding high-redshift quasars from five-color imaging data taken along the Celestial Equator by the SDSS. during its commissioning phase. In this paper, we use the color-selected sample of 39 luminous high-redshift quasars presented in Paper III to derive the evolution of the quasar luminosity function over the range of 3.6<z<5.0, and -27.5<M_1450<-25.5 (Omega=1, H_0=50 km s^-1 Mpc^-1). We use the selection function derived in Paper III to correct for sample incompleteness. The luminosity function is estimated using three different methods: (1) the 1/V_a estimator; (2) a maximum likelihood solution, assuming that the density of quasars depends exponentially on redshift and as a power law in luminosity and (3) Lynden-Bell's non-parametric C^- estimator. All three methods give consistent results. The luminous quasar density decreases by a factor of ~ 6 from z=3.5 to z=5.0, consistent with the decline seen from several previous optical surveys at z<4.5. The luminosity function follows psi(L) ~ L^{-2.5} for z~4 at the bright end, significantly flatter than the bright end luminosity function psi(L) \propto L^{-3.5} found in previous studies for z<3, suggesting that the shape of the quasar luminosity function evolves with redshift as well, and that the quasar evolution from z=2 to 5 cannot be described as pure luminosity evolution. Possible selection biases and the effect of dust extinction on the redshift evolution of the quasar density are also discussed.Comment: AJ accepted, with minor change

The Angular Clustering of Galaxy Pairs

We identify close pairs of galaxies from 278 deg^2 of Sloan Digital Sky Survey commissioning imaging data. The pairs are drawn from a sample of 330,041 galaxies with 18 < r^* < 20. We determine the angular correlation function of galaxy pairs, and find it to be stronger than the correlation function of single galaxies by a factor of 2.9 +/- 0.4. The two correlation functions have the same logarithmic slope of 0.77. We invert Limber's equation to estimate the three-dimensional correlation functions; we find clustering lengths of r_0= 4.2 +/- 0.4 h^{-1} Mpc for galaxies and 7.8 +/- 0.7 h^{-1} Mpc for galaxy pairs. These results agree well with the global richness dependence of the correlation functions of galaxy systems.Comment: 12 pages. ApJ, in pres