Theoretical and numerical study of the phase diagram of patchy colloids: ordered and disordered patch arrangements

We report theoretical and numerical evaluations of the phase diagram for a model of patchy particles. Specifically we study hard-spheres whose surface is decorated by a small number f of identical sites ("sticky spots'') interacting via a short-range square-well attraction. We theoretically evaluate, solving the Wertheim theory, the location of the critical point and the gas-liquid coexistence line for several values of f and compare them to results of Gibbs and Grand Canonical Monte Carlo simulations. We study both ordered and disordered arrangements of the sites on the hard-sphere surface and confirm that patchiness has a strong effect on the phase diagram: the gas-liquid coexistence region in the temperature-density plane is significantly reduced as f decreases. We also theoretically evaluate the locus of specific heat maxima and the percolation line.Comment: preprint, 32 pages, 6 figures, 3 tables, J. Chem. Phys. in pres

Phase diagram of patchy colloids: towards empty liquids

We report theoretical and numerical evaluations of the phase diagram for patchy colloidal particles of new generation. We show that the reduction of the number of bonded nearest neighbours offers the possibility of generating liquid states (i.e. states with temperature $T$ lower than the liquid-gas critical temperature) with a vanishing occupied packing fraction ($\phi$), a case which can not be realized with spherically interacting particles. Theoretical results suggest that such reduction is accompanied by an increase of the region of stability of the liquid phase in the ($T$-$\phi$) plane, possibly favoring the establishment of homogeneous disordered materials at small $\phi$, i.e. stable equilibrium gels.Comment: 4 pages, 4 figures, revised version, accepted in Phys. Rev. Let

Katniss as a Representation of Girl Power in Hunger Games Trilogy

This study is about the representation of girl power in Hunger Games trilogy.Hunger Games trilogy shows how women that are represented by the main character “Katniss”, can do what they want regardless others people opinion. It shows that Katniss as the main character lives in a society that does not have roles between man and woman by showing some action through her characterisctics in the story that against the culture and society. She is able to do anything without thinking about what man or woman should do. Thus,this thesis aims at showing girl power characteristics that are being represented by Katniss. Therefore, I will analyze girl power characteristics in Katniss by using girl power concept. Moreover through this analysis, I find that there are some girl power characteristics that are being represented by Katniss. First, she is an independent woman. Second, she is equally depends on her “brains and brawn”. Third, Katniss is a self-determined woman. For the result of the analysis, it can be concluded that Katniss is the representation of girl power that is shown through her action, words, and thoughts

Validation of Survey Data on Income and Employment: The ISMIE Experience

This report derives from the project "Improving survey measurement of income and employment (ISMIE)" which investigates measurement error in survey data on income and employment, using a UK sub-sample of the European Household Community Panel (ECHP). In this paper we describe the process of collecting validation data and the outcomes of the process. Validation data were obtained from two sources: employers' records and government benefit data from the Department for Work and Pensions (DWP). The former provided information on occupation and employment status, gross and net pay, membership of company pension schemes and industry sector. The latter provided histories of benefit receipt and tax credits, for example, child, disability, housing and unemployment benefits, pensions and income support. In the survey interview, respondents were asked for written permission both to obtain their DWP records and to contact their employer. They were also asked to provide information that would facilitate the process of obtaining the validation data: National Insurance number (NINO) and employer contact details. Subsequently, DWP records were extracted using a non-hierarchical matching strategy, based on different combinations of identifying variables obtained in the survey (NINO, sex, date of birth, name and postcode), and a survey of employers was carried out (mail, with telephone follow-up). The representativeness of the validation samples obtained depends on the co-operation of both survey respondents and providers of validation data, as well as errors in the matching process. We report permission rates, proportions providing matching items, match rates for the DWP data and response rates to the employer survey. We identify correlates of these measures of success at each stage of the validation process in terms of substantive characteristics of the survey respondents. Variation by subgroups is identified and implications for the representativeness of the validation sample are discussed.

The Effects of Dependent Interviewing on Responses to Questions on Income Sources

Using an experimental design, we compare two alternative approaches to dependent interviewing (proactive and reactive) with traditional independent interviewing on a module of questions about sources of income. We believe this to be the first large-scale quantitative comparison of proactive and reactive dependent interviewing. The three approaches to questioning are compared in terms of their impact on under-reporting of income sources and related bivariate statistics. The study design also enables identification of the characteristics of respondents whose responses are sensitive to the mode of interviewing. We conclude that under-reporting can be significantly greater with independent interviewing than with either form of dependent interviewing, especially for income sources that are relatively common or relatively easy to forget. We find that dependent interviewing is particularly helpful as a recall aid for respondents below retirement age and registered disabled persons.

Tuning effective interactions close to the critical point in colloidal suspensions

We report a numerical investigation of two colloids immersed in a critical solvent, with the aim of quantifying the effective colloid-colloid interaction potential. By turning on an attraction between the colloid and the solvent particles we follow the evolution from the case in which the solvent density close to the colloids changes from values smaller than the bulk to values larger than the bulk. We thus effectively implement the so-called $(+,+)$ and $(-,-)$ boundary conditions defined in field theoretical approaches focused on the description of critical Casimir forces. We find that the effective potential at large distances decays exponentially, with a characteristic decay length compatible with the bulk critical correlation length, in full agreement with theoretical predictions. We also investigate the case of $(+,-)$ boundary condition, where the effective potential becomes repulsive. Our study provides a guidance for a design of the interaction potential which can be exploited to control the stability of colloidal systems

Linking Household Survey and Administrative Record Data: What Should the Matching Variables Be?

Linkages of household survey responses with administrative data may be based on unique individual identifiers or on survey respondent characteristics. The benefits gained from using unique identifiers need to be assessed in the light of potential problems such as non-response and measurement error. We report on a study that linked survey responses to UK government agency records on benefits and tax credits in five different ways. One matched on a respondent-supplied National Insurance Number and the other four used different combinations of sex, name, address, and date of birth. As many linkages were made using matches on sex, date of birth, and post-code, or on sex, date of birth, first name and family name, as were made using matches on self-reported National Insurance Number, and the former were also relatively accurate when assessed in terms of false positive and false negative rates. The five independent matching exercises also shed light on the potential returns from hierarchical and pooled matching.Record linkage; Matching; National Insurance number; Measurement error

Regional Entrepreneurship and Innovation Management: Actors, Helices and Consensus Space

European Smart Specialization (S3) policies aim to mobilize innovation and entrepreneurial capabilities and to deliver job creation and economic growth through inter-regional cooperation. The foundation principles for this policy initiative are an entrepreneurial discovery process that aims to mobilize all stakeholders throughout all stages from conception to strategy implementation; government-led policy initiatives for selecting strategic investment priorities; and building triple helix consensus space for regional policy and strategy implementation. However, the key existing gap resides in a proper investigation of such a consensus space that would fulfill the S3 mission. In this context, this paper outlines the key developments in regional innovation and entrepreneurship that have emerged through the process of S3 development and implementation. The discussion starts with an overview of the challenges and barriers and policy response for building place-based consensus space. We look at critical questions that are addressed by national and regional authorities and the localized mobilization of entrepreneurial and innovation capabilities. Our analysis of the regional innovation and entrepreneurial systems focuses on individual actors within the triple helix model of university-industry and government and their interaction for building a consensus space. We conclude the paper with recommendations for enhanced facilitation and orchestration of inter-regional value chains

Unveiling the complex glassy dynamics of square shoulder systems: simulations and theory

We performed extensive molecular dynamics (MD) simulations, supplemented by Mode Coupling Theory (MCT) calculations, for the Square Shoulder (SS) model, a purely repulsive potential where the hard-core is complemented by a finite shoulder. For the one-component version of this model, MCT predicted [Sperl {\it et al.} Phys. Rev. Lett. {\bf 104}, 145701 (2010)] the presence of diffusion anomalies both upon cooling and upon compression and the occurrence of glass-glass transitions. In the simulations, we focus on a non-crystallising binary mixture, which, at the investigated shoulder width, shows a non-monotonic behaviour of the diffusion upon cooling but not upon isothermal compression. In addition, we find the presence of a disconnected glass-glass line in the phase diagram, ending in two higher-order singularities. These points generate a logarithmic dependence of the density correlators as well as a subdiffusive behaviour of the mean squared displacement, although with the interference of the nearby liquid-glass transition. We also perform novel MCT calculations using as input the partial structure factors obtained within MD, confirming the simulation results. The presence of two hard sphere glasses, differing only in their hard core length, is revealed, showing that the simple competition between the two is sufficient for creating a rather complex dynamical behaviour

Regional Entrepreneurship and Innovation Management: Actors, Helices and Consensus Space

European Smart Specialization (S3) policies aim to mobilize innovation and entrepreneurial capabilities and to deliver job creation and economic growth through inter-regional cooperation. The foundation principles for this policy initiative are an entrepreneurial discovery process that aims to mobilize all stakeholders throughout all stages from conception to strategy implementation; government-led policy initiatives for selecting strategic investment priorities; and building triple helix consensus space for regional policy and strategy implementation. However, the key existing gap resides in a proper investigation of such a consensus space that would fulfill the S3 mission. In this context, this paper outlines the key developments in regional innovation and entrepreneurship that have emerged through the process of S3 development and implementation. The discussion starts with an overview of the challenges and barriers and policy response for building place-based consensus space. We look at critical questions that are addressed by national and regional authorities and the localized mobilization of entrepreneurial and innovation capabilities. Our analysis of the regional innovation and entrepreneurial systems focuses on individual actors within the triple helix model of university-industry and government and their interaction for building a consensus space. We conclude the paper with recommendations for enhanced facilitation and orchestration of inter-regional value chains