1,245 research outputs found
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
The homogenization of urban climate action discourses
The diversification of actors in global climate governance may entail risks, but it is also linked to enhanced democratic performance and opportunities for innovation. To what extent has this diversification fostered a parallel multiplication of perspectives in urban climate policy? To answer this question, we analyze the evolution of urban narratives based on 463 international policy documents issued between 1946 and 2020. Our analysis shows that, instead of leading to diversification, the proliferation of actors is accompanied by a growing homogenization of urban narratives. Language appears to become progressively uniform across organizations and over time, with approaches emphasizing multi-actor governance, integrated planning, and co-benefits becoming dominant. Three factors explain this homogenization. First, actors with a long history of involvement in international development exert a significant amount of influence. Second, there is a tendency toward language harmonization in international policy. Third, urban climate narratives stabilize through association with broader policy paradigms. In conclusion, the diversification of actors in international climate policy is mediated by processes of narrative alignment, which foreclose possibilities for divergent thinking
Postfire Succession in Californian Coastal Sage Scrub: The Role of Continual Basal Sprouting
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
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