Low-temperature partial transient liquid phase diffusion bonding of Al/Mg2Si metal matrix composite to AZ91D using Al-based interlayer

Partial transient liquid phase diffusion bonding of an aluminium metal matrix composite (Al/Mg2Si) to magnesium alloy (AZ91D) was performed using two heating rates. The influence of different heating rates on the microstructure, microhardness and shear strength has been studied. With a decrease in heating rate from 20 to 2 °C/min, the Mg content in the bond line decreased and the microstructure was altered. The composition and microstructure of the joined areas were examined by X-ray diffraction (XRD) and scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (EDS). It was found that a heating rate of 2 °C/min resulted in an increasing in the shear strength of the joints. The kinetics of the bonding process accelerated due to the increase of solute diffusivity through grain boundaries of the metal matrix composite. Results suggest that Mg and Si contained in the interlayer favours the partial disruption of oxide films, facilitating the bonding process

An analysis of regulatory frameworks for wireless communications, societal concerns and risk: the case of radio frequency (RF) allocation and licensing.

This thesis analyses how and why culture and geography influence the allocation and licensing of the radio frequency (RF) spectrum in different nations. Based on a broad study of 235 countries, an inter-disciplinary approach is used to explore regulatory frameworks and attitudes toward risk. In addition, detailed case studies of the UK, France, the US and Ecuador provide deeper insights into the main contrasting regulatory styles. Three alternative sociological theories are used to analyse and explain the results for both the in-depth and broad brush studies. The Cultural Theory of Mary Douglas and co-workers is first used to categorise countries in terms of perceptual filters. The empirical findings indicate some countries to be apparently exceptional in their behaviour. The theory of Bounded Rationality is used to investigate and explain these apparent irrationalities. Finally, Rational Field Theory shows how beliefs and values guide administrations in their RF regulation. A number of key factors are found to dominate and patterns emerge. The European RF harmonisation is unique. Following European unification, wireless regulation is divided into two major camps (the EU and the US), which differ in their risk concerns, approach to top-down mandated standards, allocation of RF spectrum to licence-exempt bands and type approval process. The adoption of cellular and TV standards around the world reflects geopolitical and colonial influence. The language of a country is a significant indicator of its analogue TV standard. Interestingly, the longitude of a country to a fair extent defines RF allocation: Africa and West Asia follow Europe, whereas the Americas approximate the US. RF regulation and risk tolerability differ between tropical and non-tropical climates. The collectivised/centralised versus the individualised/market-based rationalities result in different regulatory frameworks and contrasting societal and risk concerns. The success of the top-down European GSM and the bottom-up Wi-Fi standards reveal how the central- planning and market-based approaches have thrived. Attitudes to RF human hazards and spurious emissions levels reveal that the US, Canada and Japan are more tolerant of these risks than Europe. Australia, Canada, New Zealand, UK and USA encourage technological innovation. A practical benefit of this study is that it will give regulators more freedom to choose a rational RF licensing protocol, by better understanding the possibly self-imposed boundaries of cultural and geographical factors which are currently shaping allocation. Academically, there is utility in undertaking a cultural and geographic analysis of a topic that is mostly the domain of engineering, economic and legal analysts

When retailing and Las Vegas meet: probabilistic free price promotions

A number of retailers offer gambling- or lottery-type price promotions with a chance to receive one’s entire purchase for free. Although these retailers seem to share the intuition that probabilistic free price promotions are attractive to consumers, it is unclear how they compare to traditional sure price promotions of equal expected monetary value. We compared these two risky and sure price promotions for planned purchases across six experiments in the field and in the laboratory. Together, we found that consumers are not only more likely to purchase a product promoted with a probabilistic free discount over the same product promoted with a sure discount but that they are also likely to purchase more of it. This preference seems to be primarily due to a diminishing sensitivity to the prices. In addition, we find that the zero price effect, transaction cost, and novelty considerations are likely not implicated.https://pubsonline.informs.org/doi/pdf/10.1287/mnsc.2015.2328Published versio

If you are going to pay within the next 24 hours, press 1: automatic planning prompt reduces credit card delinquency

People often form intentions but fail to follow through on them. Mounting evidence suggests that such intention-action gaps can be narrowed with prompts to make concrete plans about when, where and how to act to achieve the intention. In this paper we pushed the notion of plan-concreteness to test the efficacy of a prompt under a minimalist automated calling setting, where respondents were only prompted to indicate a narrower duration within which they intent to act. In a field experiment this planning prompt significantly helped people to pay their past dues and get out of debt delinquency. These results suggest that minimalist automatic planning prompts are a scalable, cost-effective intervention.https://onlinelibrary.wiley.com/doi/epdf/10.1002/jcpy.1031Published versio

Replicating the effect of moral standards accessibility on dishonesty, author’s response to the replication attempt

https://journals.sagepub.com/doi/pdf/10.1177/2515245918769062Accepted manuscriptPublished versio

A practitioner's guide to nudging

Supporting documentatio

Strengths and limitations of conventional approaches to risk assessment and management of EMF exposure from 5G and B5G networks

This paper describes the current science-based approach to ensuring public safety from RF-EMF base stations. It acknowledges that a degree of public concern persists despite the fact that dose limits are seldom if ever approached in practice. One plausible contributor to the discord is a tendency within parts of academia and by some planning authorities to pursue a technocratic policy approach to siting wherein public concerns are attributed to scientific uncertainty over health risks, whereas the reality is that societal concerns over base stations is broader. Thus, potential mis-framing of the debate as a purely scientific issue leads to inappropriate risk communication exercises which in fact polarise the situation by disenfranchising other potentially legitimate siting concerns. It is recommended that more attention should be paid to the non-health related siting issues, which could be handled by a thoughtful democratic / deliberative process, and that this should not be conflated with the scientific debate over the uncertain and possibly non-existent risks posed by RF EMF complying with the existing science-based dose limit

Providing health checks as incentives to retain blood donors — evidence from two field experiments

The collection of blood given by donors has proven to be a substantial societal and a managerial challenge. Consequently, blood donation services seek for incentive mechanisms to retain donors. However, economic or material rewards might entail negative side effects such as motivational crowding out or even attracting “bad blood”. In an effort to increase the retention of established blood donors, we conducted two randomized field trials (N1 = 53,257, N2 = 31,522) in cooperation with the German Red Cross Blood Donation Service and tested the effectiveness of an incentive strategy that is directly related to the blood donation itself: offering a comprehensive blood health check. Contrary to previous related research, we found substantial positive effects of a comprehensive blood health check incentive on donation behavior. In addition, unlike previous studies, we examine effects of repeated exposure to this incentive and do not find any wearout effects. Considering the positive effect of this incentive on donor retention and the relative low cost for providing this service to donors, our findings suggest that offering comprehensive blood health check incentives is a viable and cost-efficient marketing strategy to increase the retention among previous donors even if offered over the longer run.Accepted manuscrip

Resistance and Resilience: Latinx Migrant Farmworkers in the Northern Borderlands

Vermont prides itself on being a national role model in developing innovative models for community-supported, ecologically responsible agricultural practices. However, Vermont\u27s largest sector of agriculture, the dairy industry, has increasingly relied on Latinx* migrant farm laborers who face significant challenges. Due to a lack of a year-round agricultural visa program, most farmworkers on Vermont\u27s dairy farms are unable to receive proper documentation. This circumstance has a significant impact on migrant workers, particularly those living and working closer to the border, as those areas fall within federal jurisdiction of US immigration enforcement. In these borderlands, surveillance is intensified and so the pressure to be invisible is heightened. The current availability of agricultural visas is limited to seasonal migrant farmworkers, and because dairy is year-round work, farmworkers in the dairy industry are barred from accessing proper documentation. Increased patrolling along the northern border results in extreme isolation, fear, and the inability to access basic human rights. For migrant workers on Vermont\u27s dairy farms, just taking a trip to the grocery store is to risk deportation. This thesis examines systemic barriers, complex relationships, and resilient responses of Vermont\u27s farmworkers, drawing upon applied, mixed methods. The first article uses ethnography to examine food access and food sovereignty through Huertas, an applied garden project in northern VT. The second article analyzes the methodologies connected to El Viaje Más Caro/The Most Costly Journey, an applied cartooning project that shares farmworker stories with other migrant farmworkers as a tool to break cycles of isolation and relieve psychological distress. Both projects illustrate resilient responses to the barriers associated with being undocumented along the Northern border. While the thesis is based on research conducted in Vermont, the significance is broader in scope, and representative of national and international trends. The food system is built upon those who are continually stripped of and denied rights. While this is about Vermont, it is not only about Vermont: these stories are symptomatic of a larger structural violence. This thesis situates itself in a multi-scalar context-Vermont, the US, international- in which the stories conveyed are indicative of political and economic systemic obstacles, and the potential for human creativity to subvert and respond to systems of oppression. *I use the term Latinx throughout my thesis because it is a gender-neutral alternative to Latino, Latina and even Latin@. It is pronounced La-teen-ex . This is a term that has been introduced by the trans/queer community, but is increasingly being adopted by scholars, activists, journalists, and social media. (Ramirez & Blay, 2016