6,674 research outputs found

    Accessing the inaccessible: e-sampling via Facebook (867)

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    This paper reflects on the accessing and sampling strategies used in a qualitative PhD study focused on hard to access communities. The hypothesis formulated is that, given the limited PhD research resources, reflectively combining traditional snowballing with e-snowballing sampling via Facebook is efficient, particularly when trying to reach hard to access populations. This paper contributes to knowledge by offering context bounded insights for PhD researchers on how to efficiently access and sample hard to reach informants through e snowballing via Facebook. It provides new evidence of the time it takes to recruit research participants using different sampling techniques. To test this hypothesis, an e snowballing sampling process via Facebook was designed to access and sample immigrant entrepreneurs into participating in face to face interviews. The e-snowballing sampling technique via Facebook was more time-efficient, critical in increasing the sample size, yielding a similar participation rate to the traditional snowballing

    Particle Flow Calorimetry at the ILC

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    One of the most important requirements for a detector at the ILC is good jet energy resolution. It is widely believed that the particle flow approach to calorimetry is the key to achieving the goal of 0.3/sqrt(E[GeV]). This paper describes the current performance of the PandoraPFA particle flow algorithm. For 45 GeV jets in the Tesla TDR detector concept, the ILC jet energy resolution goal is reached. At higher energies the jet energy resolution becomes worse and can be described by the empirical expression: sigma_E/E ~ 0.265/sqrt(E[GeV]) + 1.2x10^{-4}E[GeV].Comment: 5 pages, 2 .eps figures, to appear in Proc. LCWS06, Bangalore, March 200

    You scratch my back, and I scratch yours: Bartering for qualitative data

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    Recruiting research participants has been one of the significant challenges faced by qualitative researchers. Barter gained momentum during the Covid pandemic across a broad spectrum of professionals, including scholars searching to recruit research participants, despite being surrounded by ethical concerns of coercion or undue influence. This reflective paper created a barter reflective and ethical protocol showing how bartering created the entrepreneurial opportunity for 16 migrant entrepreneurs to exchange an average of 60 minutes of their time for participating in a qualitative interview with an average of 2.25 hrs (145 minutes) of business counselling and translation services delivered by the researcher. This paper contributes to the methodological practice of bartering. It argues that bartering is an ethical and efficient research practice in need of a code of ethics and protocol and should not be dismissed as ethically suspect until substantial evidence is brought forwar

    Ethi(cs)quette of (Re)searching with E-friends: Clicking Towards a Social Media-driven Research Agenda

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    Social media increasingly shapes our professional and personal lives, leveraging its size, the potential for ubiquity, and real-time communication. Ranked the most popular social media platform by the number of subscribers, Facebook is increasingly gaining momentum as a research tool, mostly used to conduct surveys, adverts, and observation-driven research. However, Facebook’s potential for supporting consented qualitative research remains largely unexplored and deemed sometimes ethically questionable in the midst of ongoing debates around data protection rules and the ambiguity surrounding e-friendship meaning. This paper is based on an interpretative phenomenological Ph.D. study, between 2017-2020, aiming to deepen our understanding of London-based Romanian migrant entrepreneurs' experiences of social inclusion through entrepreneurship. This paper contributes to the literature on research methodology reflective practice of enabling ethical research, by outlining ethical implications of sampling via Facebook and when researching with e-friends as Facebook friends. It offers context-bound insights as guidance to researchers incorporating social media in their qualitative research The significance of this ethical research practice is discussed in terms of privacy, confidentiality, and informed consent as a cross point between GDPR regulatory framework, as universal research ethical framework, Facebook data privacy settings and the researcher’s reflective approach to mitigate ethical challenges experienced when recruiting Facebook e-friends

    The Quest for Deeper Understanding in Interpretative Research: Hidden Meaning in Plain Sight

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    This paper contributes to the literature on qualitative methodology in a novel way, by being one of a handful of studies offering context and culture-bound insights of an interpretative analysis of meaning based on non-verbal communication from 49 semi-structured, face-to-face interviews. This paper is based on an interpretative phenomenological Ph.D. study, between 2017-2020, aiming to deepen our understanding of London-based Romanian migrant entrepreneurs' experiences of social inclusion through entrepreneurship. By leveraging the cultural insider positionality of the interviewer in this study, which granted direct access to this community and also valuable cultural understanding of participants’ non-verbal communication, seeking meaning within the untapped potential of around 93% non-verbal language, widely overlooked by qualitative researchers, has become an achievable research goal. By creating its own inventory of nonverbal communication codes, this paper uses interview extracts rich in nonverbal communication as illustrative examples to showcase their interpretative significance

    Chemical modification of bacterial cellulose for the development of an antibacterial wound dressing

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    Bacterial cellulose is a bacterially derived polymer with great potential for application in wound healing due to its innate properties such as high biocompatibility and biodegradability. In addition to this, it is naturally biosynthesized by bacteria as a hydrogel, which makes it an optimal substrate for the treatment of dry wounds, where additional moisture is required to facilitate the healing process. However, this polymer lacks antibacterial properties. As bacterial infections are becoming increasingly common and difficult to treat due to antimicrobial resistance, it is of crucial importance to develop strategies for the modification of cellulose to ensure protection against bacterial contamination. In this study, a green-chemistry approach was proposed for the functionalization of cellulose to introduce antibacterial functional groups. Two different active agents, namely glycidyl trimethylammonium chloride and glycidyl hexadecyl ether, were used for the covalent derivatization of the hydroxyl groups of glucose through a heterogeneous reaction in basic aqueous conditions. The modified material was chemically and mechanically characterized by solid-state techniques and rheological measurements. A biological assessment was then carried out both using bacterial cells and human keratinocytes. It was observed that the functionalization performed induced a reduction of approximately half of the bacterial population within 24 h of direct contact with Staphylococcus aureus subsp. aureus Rosenbach 6538PTM and Escherichia coli (Migula) Castellani and Chalmers ATCC® 8739TM (respectively, a reduction of 53% and 43% in the cell number was registered for the two strains). In parallel, cytotoxicity studies performed on keratinocytes (HaCaT cell line) showed cell viability in the range of 90 to 100% for up to 6 days of direct contact with both unmodified and modified samples. The morphology of the cells was also visually evaluated, and no significant difference was noted as compared to the control. Finally, the in vitro scratch assay evidenced good wound closure rates in the presence of the samples, with complete coverage of the scratched area after 5 days for both the modified cellulose and the positive control (i.e., keratinocytes growth medium). Overall, the modified hydrogel showed promising features, confirming its potential as an alternative substrate to develop a sustainable, antibacterial and biocompatible wound dressing

    Analysis of clogging in constructed wetlands using magnetic resonance

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    In this work we demonstrate the potential of permanent magnet based magnetic resonance sensors to monitor and assess the extent of pore clogging in water filtration systems. The performance of the sensor was tested on artificially clogged gravel substrates and on gravel bed samples from constructed wetlands used to treat wastewater. Data indicate that the spin lattice relaxation time is linearly related to the hydraulic conductivity in such systems. In addition, within biologically active filters we demonstrate the ability to determine the relative ratio of biomass to abiotic solids, a measurement which is not possible using alternative techniques

    Production of a novel medium chain length Poly(3-hydroxyalkanoate) using unprocessed biodiesel waste and its evaluation as a tissue engineering scaffold

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    This study demonstrated the utilisation of unprocessed biodiesel waste as a carbon feedstock for Pseudomonas mendocina CH50, for the production of PHAs. A PHA yield of 39.5% CDM was obtained using 5% (v/v) biodiesel waste substrate. Chemical analysis confirmed that the polymer produced was poly(3-hydroxyhexanoate-co-3-hydroxyoctanoate-co-3- hydroxydecanoate-co-3-hydroxydodecanoate) or P(3HHx-3HO-3HD-3HDD). P(3HHx-3HO- 3HD-3HDD) was further characterised and evaluated for its use as a tissue engineering scaffold (TES). This study demonstrated that P(3HHx-3HO-3HD-3HDD) was biocompatible with the C2C12 (myoblast) cell line. In fact, the % cell proliferation of C2C12 on the P(3HHx-3HO-3HD-3HDD) scaffold was 72% higher than the standard tissue culture plastic confirming that this novel PHA was indeed a promising new material for soft tissue engineering
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