Ethnographies of social enterprise

Purpose – As a critical and intimate form of inquiry, ethnography remains close to lived realities and equips scholars with a unique methodological angle on social phenomena. This paper aims to explore the potential gains from an increased use of ethnography in social enterprise studies. Design/methodology/approach – The authors develop the argument through a set of dualistic themes, namely, the socio-economic dichotomy and the discourse/practice divide as predominant critical lenses through which social enterprise is currently examined, and suggest shifts from visible leaders to invisible collectives and from case study-based monologues to dialogic ethnography. Findings – Ethnography sheds new light on at least four neglected aspects. Studying social enterprises ethnographically complicates simple reductions to socio-economic tensions, by enriching the set of differences through which practitioners make sense of their work-world. Ethnography provides a tool for unravelling how practitioners engage with discourse(s) of power, thus marking the concrete results of intervention (to some degree at least) as unplannable, and yet effective. Ethnographic examples signal the merits of moving beyond leaders towards more collective representations and in-depth accounts of (self-)development. Reflexive ethnographies demonstrate the heuristic value of accepting the self as an inevitable part of research and exemplify insights won through a thoroughly bodily and emotional commitment to sharing the life world of others. Originality/value – The present volume collects original ethnographic research of social enterprises. The editorial develops the first consistent account of the merits of studying social enterprises ethnographically

Hydraulic Transport Across Hydrophilic and Hydrophobic Nanopores: Flow Experiments with Water and n-Hexane

We experimentally explore pressure-driven flow of water and n-hexane across nanoporous silica (Vycor glass monoliths with 7 or 10 nm pore diameters, respectively) as a function of temperature and surface functionalization (native and silanized glass surfaces). Hydraulic flow rates are measured by applying hydrostatic pressures via inert gases (argon and helium, pressurized up to 70 bar) on the upstream side in a capacitor-based membrane permeability setup. For the native, hydrophilic silica walls, the measured hydraulic permeabilities can be quantitatively accounted for by bulk fluidity provided we assume a sticking boundary layer, i.e. a negative velocity slip length of molecular dimensions. The thickness of this boundary layer is discussed with regard to previous capillarity-driven flow experiments (spontaneous imbibition) and with regard to velocity slippage at the pore walls resulting from dissolved gas. Water flow across the silanized, hydrophobic nanopores is blocked up to a hydrostatic pressure of at least 70 bar. The absence of a sticking boundary layer quantitatively accounts for an enhanced n-hexane permeability in the hydrophobic compared to the hydrophilic nanopores.Comment: 15 pages, 7 figures, in press, Physical Review E 201

Connectivity of the Uniform Random Intersection Graph

A \emph{uniform random intersection graph} $G(n,m,k)$ is a random graph constructed as follows. Label each of $n$ nodes by a randomly chosen set of $k$ distinct colours taken from some finite set of possible colours of size $m$. Nodes are joined by an edge if and only if some colour appears in both their labels. These graphs arise in the study of the security of wireless sensor networks. Such graphs arise in particular when modelling the network graph of the well known key predistribution technique due to Eschenauer and Gligor. The paper determines the threshold for connectivity of the graph $G(n,m,k)$ when $n\to \infty$ with $k$ a function of $n$ such that $k\geq 2$ and $m=\lfloor n^\alpha\rfloor$ for some fixed positive real number $\alpha$. In this situation, $G(n,m,k)$ is almost surely connected when $$\liminf k^2n/m\log n>1,$$ and $G(n,m,k)$ is almost surely disconnected when $$\limsup k^2n/m\log n<1.$$Comment: 19 pages New version with rewritten intro, and a discussion section added. The results and proofs are unchanged from the previous versio

Female Leaders: Injurious or Inspiring Role Models for Women?

The impact of female role models on women’s leadership aspirations and self-perceptions after a leadership task were assessed across two laboratory studies. These studies tested the prediction that upward social comparisons to high-level female leaders will have a relatively detrimental impact on women’s self-perceptions and leadership aspirations compared to male and less elite female leaders. In Study 1 (N = 60), women were presented with both female and male leaders before serving as leaders of ostensible three-person groups in an immersive virtual environment. This study established the relatively deflating impact of high-level female leaders, compared to high-level male leaders and the control condition, on participants’ self-perceptions. Using a similar methodology, Study 2 (N = 57) further demonstrated that the impact of elite female leaders on participants’ self-perceptions in turn adversely affects their leadership aspirations. This study also showed more positive responses to non-elite female leaders with whom participants more strongly identify and who increase counter-stereotypic thinking. Taken together, these studies point to a potential dark side of elite female leaders as role models in a domain where individuals are possible targets of a negative stereotype. However, they also point to the relatively more beneficial impact of female role models who disconfirm the negative stereotype

The Role of Social Dominance Orientation and Patriotism in the Evaluation of Minority and Female Leaders

This research broadens our understanding of racial and gender bias in leader evaluations by merging implicit leadership theory and social dominance perspectives. Across two experimental studies (291 participants), we tested the prediction that bias in leader evaluations stemming from White and masculine leader standards depends on the extent to which people favor hierarchical group relationships (SDO) and their level of patriotism. Employing the Goldberg paradigm, participants read identical leadership speeches attributed to either a woman or a man described as either a minority (Black or Latino/a) or a majority (White) group member. Results show SDO negatively predicted evaluations of minority and female leaders and patriotism positively predicted evaluations of White leaders

Social Psychological Approaches to Women and Leadership Theory

In this chapter, we take a social psychological approach to understanding gender and leadership. In doing so, we explain how both the social context and people’s perceptions influence leadership processes involving gender. The theoretical approaches taken by social psychologists are often focused on one of these two questions: (1) Are there gender differences in leadership style and effectiveness? and, (2) What barriers do women face in the leadership domain? We begin our chapter by reviewing the literature surrounding these two questions. We then discuss in detail one of the greatest barriers to women in leadership: the prejudice and discrimination that stem from gender stereotypic beliefs and implicit theories of leadership. Social psychological theory helps to better our understanding of how stereotypes shape expectations people have of female leaders, as well as how they influence women’s own thoughts and behaviors via stereotype threat processes. Social psychological approaches to understanding gender and leadership reveal how gender does matter in how people respond to leaders and how leaders approach their roles, regardless of whether it ought to matter

Star formation and molecular hydrogen in dwarf galaxies: a non-equilibrium view

We study the connection of star formation to atomic (HI) and molecular hydrogen (H$_2$) in isolated, low metallicity dwarf galaxies with high-resolution ($m_{\rm gas}$ = 4 M$_\odot$, $N_{\rm ngb}$ = 100) SPH simulations. The model includes self-gravity, non-equilibrium cooling, shielding from an interstellar radiation field, the chemistry of H$_2$ formation, H$_2$-independent star formation, supernova feedback and metal enrichment. We find that the H$_2$ mass fraction is sensitive to the adopted dust-to-gas ratio and the strength of the interstellar radiation field, while the star formation rate is not. Star formation is regulated by stellar feedback, keeping the gas out of thermal equilibrium for densities $n <$ 1 cm$^{-3}$. Because of the long chemical timescales, the H$_2$ mass remains out of chemical equilibrium throughout the simulation. Star formation is well-correlated with cold ( T $\leqslant$ 100 K ) gas, but this dense and cold gas - the reservoir for star formation - is dominated by HI, not H$_2$. In addition, a significant fraction of H$_2$ resides in a diffuse, warm phase, which is not star-forming. The ISM is dominated by warm gas (100 K $<$ T $\leqslant 3\times 10^4$ K) both in mass and in volume. The scale height of the gaseous disc increases with radius while the cold gas is always confined to a thin layer in the mid-plane. The cold gas fraction is regulated by feedback at small radii and by the assumed radiation field at large radii. The decreasing cold gas fractions result in a rapid increase in depletion time (up to 100 Gyrs) for total gas surface densities $\Sigma_{\rm HI+H_2} \lesssim$ 10 M$_\odot$pc$^{-2}$, in agreement with observations of dwarf galaxies in the Kennicutt-Schmidt plane.Comment: Accepted for publication in MNRAS. Changes (including a pamameter study in Appendix C) highlighte

A finite strain thermo-mechanically coupled material model for semi-crystalline polymers

In this work, a thermo-mechanically coupled constitutive model for semicrystalline polymers is derived in a thermodynamically consistent manner. In general, the macroscopic material behaviour of this class of materials is dictated by the underlying microstructure, i.e. by the distribution and structure of crystalline regimes, which form up after cooling from the amorphous melt. In order to account for the latter, the total degree of crystallinity is incorporated as an internal variable and its evolution is prescribed by means of a non-isothermal crystallisation kinetics model. The numerically efficient and robust framework is characterised based on experimental data for Polyamide 6 and shows a promising potential to predict the hyperelastic, visco-plastic material behaviour at various temperature