Physical interpretation of the Wigner rotations and its implications for relativistic quantum information

We present a new treatment for the spin of a massive relativistic particle in the context of quantum information based on a physical interpretation of the Wigner rotations, obtaining different results in relation to the previous works. We are lead to the conclusions that it is not possible to define a reduced density matrix for the particle spin and that the Pauli-Lubanski (or similar) spin operators are not suitable to describe measurements where spin couples to an electromagnetic field in the measuring apparatus. These conclusions contradict the assumptions made by most of the previous papers on the subject. We also propose an experimental test of our formulation.Comment: 10 pages, 2 figures. Several changes were made on the text. One extra example was include

China's imaginary of ecological civilization: A resonance between the state-led discourse and sociocultural dynamics

The field of science, technology and society (STS) calls for greater geographical diversity that draws attention to ‘the rich mosaic of non-Western cultures.’ This perspective provides cultural insights into the construction of the imaginary of ecological civilization in China. From the lens of sociotechnical theory, this perspective presents the discourses and practices constitutive of ecological civilization. We argue that ecological civilization operates as an imaginary that builds on both state-led environmental narratives and sociocultural traditions. In particular, the Chinese perception of human-nature relationships, represented by the principle of “Unity of Man and Nature,” constitutes a key cultural feature in the collective vision of a desirable life of Chinese people. The perspective piece shows how sociocultural roots might mediate or antagonize relations between national and community aspirations. Moreover, ecological civilization extends beyond any single sector or technology, and the unified diversity projected by the imaginary is a co-production of local knowledge with the normativity embedded in ecological civilization

Ethnographic Media Literacy in the Third Space.

As Poveda, Thomson and Ferro (2018) observe, there is a momentum in ethnographic explorations of the arts in education in which “an increasing number of researchers have turned their attention to expressive practices and artistic spaces as contexts and tools for learning, identity construction and social mobilization (p. 269).” However, the distinction between ethnography of education and education by ethnography – i.e. an ethnographic pedagogy - is at least partly maintained within this momentum. This research attempted an ethnographic approach to pedagogy, utilising digital media literacy for creative production, to facilitate new ways for students to critically engage with their own lived experiences in relation to their participation in formal ‘schooled’ learning. The pedagogic value of this type of ethnographic approach was assessed over two years of participatory fieldwork with three secondary schools and one further education college in the West Midlands of the United Kingdom, working with teachers in multiple curricular areas using ‘low-tech’ media literacy work with students. Our findings suggest that while there are clear benefits presented by this (digital) ethnographic pedagogy, for it to work in media literacy education there is a need for the creation of critical, dynamic ‘third spaces’ (Bhabha, 1994) for students to work in. The creation of these spaces is highly contingent on the respective classification and framing (Bernstein, 1975) of the subject curriculum. This research developed out of a series of ethnographic interventions into digital media education, including a European Union funded project on ethnographic social documentary as a transferable pedagogic tool (McDougall, 2013) and a large scale field review of third space media literacies (Potter and McDougall, 2017, see also McDougall et al, 2018). To apply this conceptual framing to a specific pedagogic context over a longer time period, the research aimed to address the following research questions: 1. What pedagogical value is afforded by the use of ethnographic digital media making as a tool for creative production and critically reflexive media literacy? 2. How can ethnographic pedagogy, in the form of creative digital media production, enhance participation in classroom learning?3. What is the potential for ‘low-tech’ creative production to transgress boundaries between curriculum areas and modes of literacy, learning and teaching? 4. How can ethnographic digital media making give ‘voice’ to learners and how is ‘voice’ socio-culturally framed within pedagogic and research discourses

Spatiotemporal perspectives on urban energy transitions: a comparative study of three cities in China

This paper develops an integrated framework to study the socio-spatial and temporal dimensions of urban energy transitions to investigate the development and spread of solar energy technologies in urban China. A comparative analysis of three case studies of solar energy transitions in the cities of Foshan (in Guangdong), Rizhao (in Shandong), and Wuxi (in Jiangsu) demonstrates the framework’s applicability. The results map each city’s trajectory towards low carbon energy. Transitions result from dynamic interactions among central and local governments, solar manufacturers, solar installers, and residents. Alongside industrial strategies, locally-specific factors have a determining influence on the eventual outcomes

Emerging dynamics of public participation in climate governance: A case study of solar energy application in Shenzhen, China

Climate governance scholars have recognized the role of public participation in improving the outcomes of climate action. Nevertheless, increasing advocacy of environmental authoritarianism in the narratives of climate governance questions the need for and legitimacy of public participation. This study uncovers the emerging dynamics of climate participation in Chinese communities through a case of the implementation of solar energy. Our research challenges the general impression of nonparticipation in climate governance in China and argues that participation is taking a less visible form that we call “defensive participation.” Defensive participation occurs when communities mobilize to defend their interests. Just as other forms of public participation, defensive participation can play important roles in improving policy outcomes and accountability. More nuanced theoretical and empirical accounts of public participation in climate governance will improve current understandings of climate governance in China

A culture-led approach to understanding energy transitions in China: The correlative epistemology

Transformations of the energy system are unfolding in China at an unprecedented scale and pace. The dynamics of China's energy transitions impact global trends of energy decarbonisation. Transition theories within the Anglophone academic tradition have been used to examine this process, but they tend to misrepresent the social, cultural, and political structures that shape energy transitions in China. This paper proposes a move from an analysis of energy transitions “with Chinese characteristics” to alternative thinking on energy transitions truly rooted in Chinese epistemological and philosophical constructs. The correlative epistemology refers to a Chinese tradition of social studies that describes the cosmos as a structured order of relations (guanxi). This tradition sees guanxi as the fundamental constituent of Chinese society. Such a relational focus enables a culture-led reading of China's energy transitions, thus responding to calls for transition theories “from elsewhere.” In particular, correlative interpretations of innovation and transition processes in China frame energy transitions within broader societal transformations, define the operation of transition governance, and reveal that pre-existing guanxi networks shape the activities of actors in transition processes

Temporal and Geospatial Trends of Pediatric Cancer Incidence in Nebraska Over a 24-Year Period

BACKGROUND: Data from the Surveillance, Epidemiology, and End Results (SEER) revealed that the incidence of pediatric cancer in Nebraska exceeded the national average during 2009-2013. Further investigation could help understand these patterns. METHODS: This retrospective cohort study investigated pediatric cancer (0-19 years old) age adjusted incidence rates (AAR) in Nebraska using the Nebraska Cancer Registry. SEER AARs were also calculated as a proxy for pediatric cancer incidence in the United States (1990-2013) and compared to the Nebraska data. Geographic Information System (GIS) mapping was also used to display the spatial distribution of cancer in Nebraska at the county level. Finally, location-allocation analysis (LAA) was performed to identify a site for the placement of a medical center to best accommodate rural pediatric cancer cases. RESULTS: The AAR of pediatric cancers was 173.3 per 1,000,000 in Nebraska compared to 167.1 per 1,000,000 in SEER. The AAR for lymphoma was significantly higher in Nebraska (28.1 vs. 24.6 per 1,000,000; p = 0.009). For the 15-19 age group, the AAR for the 3 most common pediatric cancers were higher in Nebraska (p \u3c 0.05). Twenty-three counties located \u3e2 h driving distance to care facilities showed at least a 10% higher incidence than the overall state AAR. GIS mapping identified a second potential treatment site that would alleviate this geographic burden. CONCLUSIONS: Regional differences within Nebraska present a challenge for rural populations. Novel use of GIS mapping to highlight regional differences and identify solutions for access to care issues could be used by similar states

Particle detectors, geodesic motion, and the equivalence principle

It is shown that quantum particle detectors are not reliable probes of spacetime structure. In particular, they fail to distinguish between inertial and non-inertial motion in a general spacetime. To prove this, we consider detectors undergoing circular motion in an arbitrary static spherically symmetric spacetime, and give a necessary and sufficient condition for the response function to vanish when the field is in the static vacuum state. By examining two particular cases, we show that there is no relation, in general, between the vanishing of the response function and the fact that the detector motion is, or is not, geodesic. In static asymptotically flat spacetimes, however, all rotating detectors are excited in the static vacuum. Thus, in this particular case the static vacuum appears to be associated with a non-rotating frame. The implications of these results for the equivalence principle are considered. In particular, we discuss how to properly formulate the principle for particle detectors, and show that it is satisfied.Comment: 14 pages. Revised version, with corrections; added two references. Accepted for publication in Class. Quantum Gra