| 1. |
- Acharya, B. S., et al.
(författare)
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Introducing the CTA concept
- 2013
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Ingår i: Astroparticle physics. - : Elsevier BV. - 0927-6505 .- 1873-2852. ; 43, s. 3-18
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The Cherenkov Telescope Array (CTA) is a new observatory for very high-energy (VHE) gamma rays. CTA has ambitions science goals, for which it is necessary to achieve full-sky coverage, to improve the sensitivity by about an order of magnitude, to span about four decades of energy, from a few tens of GeV to above 100 TeV with enhanced angular and energy resolutions over existing VHE gamma-ray observatories. An international collaboration has formed with more than 1000 members from 27 countries in Europe, Asia, Africa and North and South America. In 2010 the CTA Consortium completed a Design Study and started a three-year Preparatory Phase which leads to production readiness of CTA in 2014. In this paper we introduce the science goals and the concept of CTA, and provide an overview of the project. (C) 2013 Elsevier B.V. All rights reserved.
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| 2. |
- Actis, M., et al.
(författare)
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Design concepts for the Cherenkov Telescope Array CTA : an advanced facility for ground-based high-energy gamma-ray astronomy
- 2011
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Ingår i: Experimental astronomy. - : Springer. - 0922-6435 .- 1572-9508. ; 32:3, s. 193-316
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Tidskriftsartikel (refereegranskat)abstract
- Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. Ground-based gamma-ray astronomy has a huge potential in astrophysics, particle physics and cosmology. CTA is an international initiative to build the next generation instrument, with a factor of 5-10 improvement in sensitivity in the 100 GeV-10 TeV range and the extension to energies well below 100 GeV and above 100 TeV. CTA will consist of two arrays (one in the north, one in the south) for full sky coverage and will be operated as open observatory. The design of CTA is based on currently available technology. This document reports on the status and presents the major design concepts of CTA.
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| 3. |
- Alneberg, Johannes, et al.
(författare)
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Genomes from uncultivated prokaryotes : a comparison of metagenome-assembled and single-amplified genomes
- 2018
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Ingår i: Microbiome. - : BioMed Central. - 2049-2618. ; 6
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Tidskriftsartikel (refereegranskat)abstract
- Background: Prokaryotes dominate the biosphere and regulate biogeochemical processes essential to all life. Yet, our knowledge about their biology is for the most part limited to the minority that has been successfully cultured. Molecular techniques now allow for obtaining genome sequences of uncultivated prokaryotic taxa, facilitating in-depth analyses that may ultimately improve our understanding of these key organisms. Results: We compared results from two culture-independent strategies for recovering bacterial genomes: single-amplified genomes and metagenome-assembled genomes. Single-amplified genomes were obtained from samples collected at an offshore station in the Baltic Sea Proper and compared to previously obtained metagenome-assembled genomes from a time series at the same station. Among 16 single-amplified genomes analyzed, seven were found to match metagenome-assembled genomes, affiliated with a diverse set of taxa. Notably, genome pairs between the two approaches were nearly identical (average 99.51% sequence identity; range 98.77-99.84%) across overlapping regions (30-80% of each genome). Within matching pairs, the single-amplified genomes were consistently smaller and less complete, whereas the genetic functional profiles were maintained. For the metagenome-assembled genomes, only on average 3.6% of the bases were estimated to be missing from the genomes due to wrongly binned contigs. Conclusions: The strong agreement between the single-amplified and metagenome-assembled genomes emphasizes that both methods generate accurate genome information from uncultivated bacteria. Importantly, this implies that the research questions and the available resources are allowed to determine the selection of genomics approach for microbiome studies.
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| 4. |
- Andersson, Anders, et al.
(författare)
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Pyrosequencing reveals contrasting seasonal dynamics of taxa within Baltic Sea bacterioplankton communities
- 2010
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Ingår i: ISME JOURNAL. - : Springer Science and Business Media LLC. - 1751-7362 .- 1751-7370. ; 4:2, s. 171-181
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Tidskriftsartikel (refereegranskat)abstract
- Variation in traits causes bacterial populations to respond in contrasting ways to environmental drivers. Learning about this will help us understand the ecology of individual populations in complex ecosystems. We used 454 pyrosequencing of the hypervariable region V6 of the 16S rRNA gene to study seasonal dynamics in Baltic Sea bacterioplankton communities, and link community and population changes to biological and chemical factors. Surface samples were collected from May to October 2003 and in May 2004 at the Landsort Deep in the central Baltic Sea Proper. The analysis rendered, on average, 20 200 sequence reads for each of the eight samples analyzed, providing the first detailed description of Baltic Sea bacterial communities. Community composition varied dramatically over time, supporting the idea of strong temporal shifts in bacterioplankton assemblages, and clustered according to season (including two May samples from consecutive years), suggesting repeatable seasonal succession. Overall, community change was most highly correlated with change in phosphorus concentration and temperature. Individual bacterial populations were also identified that tightly co-varied with different Cyanobacteria populations. Comparing the abundance profiles of operational taxonomic units at different phylogenetic distances revealed a weak but significant negative correlation between abundance profile similarity and genetic distance, potentially reflecting habitat filtering of evolutionarily conserved functional traits in the studied bacterioplankton.
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| 5. |
- Baraldi, Enrico, 1970-, et al.
(författare)
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Start-ups and networks : Interactive perspectives and a research agenda
- 2019
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Ingår i: Industrial Marketing Management. - : Elsevier. - 0019-8501 .- 1873-2062. ; 80, s. 58-67
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Tidskriftsartikel (refereegranskat)abstract
- This article introduces Industrial Marketing Management's special issue on start-ups and networks. To begin with, we stress the relevance of understanding the context wherein entrepreneurship unfolds – a context filled with social, technical and economic connections to which the start-up needs to relate. We also present and confront three network perspectives which bring different insights to the interplay between start-ups and networks: Social Network (SN) theory, the Industrial Marketing & Purchasing (IMP) view, and Actor-Network Theory (ANT). Next, we introduce the 12 papers of this special issue and place them on a continuum covering a start-up's process of network embedding and including the three periods of establishment, consolidation and stabilization. We conclude with a research agenda suggesting five avenues for further research: (1) tracing start-ups' process of network embedding, (2) mapping the connections between the different networks affecting a start-up, (3) grasping the negative effects of networks on start-ups, (4) making longitudinal case studies on start-ups and networks more comparable via common analytical tools, and (5) investigating how policy influences the complex interplay between start-ups and networks.
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| 6. |
- Bergman, Anders, et al.
(författare)
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Spin relaxation signature of colossal magnetic anisotropy in platinum atomic chains
- 2016
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Ingår i: Scientific Reports. - : Springer Nature. - 2045-2322. ; 6
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Tidskriftsartikel (refereegranskat)abstract
- Recent experimental data demonstrate emerging magnetic order in platinum atomically thin nanowires. Furthermore, an unusual form of magnetic anisotropy-colossal magnetic anisotropy (CMA)-was earlier predicted to exist in atomically thin platinum nanowires. Using spin dynamics simulations based on first-principles calculations, we here explore the spin dynamics of atomically thin platinum wires to reveal the spin relaxation signature of colossal magnetic anisotropy, comparing it with other types of anisotropy such as uniaxial magnetic anisotropy (UMA). We find that the CMA alters the spin relaxation process distinctly and, most importantly, causes a large speed-up of the magnetic relaxation compared to uniaxial magnetic anisotropy. The magnetic behavior of the nanowire exhibiting CMA should be possible to identify experimentally at the nanosecond time scale for temperatures below 5 K. This time-scale is accessible in e.g., soft x-ray free electron laser experiments.
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| 7. |
- Bessarab, Pavel F., et al.
(författare)
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Lifetime of racetrack skyrmions
- 2018
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Ingår i: Scientific Reports. - : Springer. - 2045-2322. ; 8
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Tidskriftsartikel (refereegranskat)abstract
- The skyrmion racetrack is a promising concept for future information technology. There, binary bits are carried by nanoscale spin swirls-skyrmions-driven along magnetic strips. Stability of the skyrmions is a critical issue for realising this technology. Here we demonstrate that the racetrack skyrmion lifetime can be calculated from first principles as a function of temperature, magnetic field and track width. Our method combines harmonic transition state theory extended to include Goldstone modes, with an atomistic spin Hamiltonian parametrized from density functional theory calculations. We demonstrate that two annihilation mechanisms contribute to the skyrmion stability: At low external magnetic field, escape through the track boundary prevails, but a crossover field exists, above which the collapse in the interior becomes dominant. Considering a Pd/Fe bilayer on an Ir(111) substrate as a well-established model system, the calculated skyrmion lifetime is found to be consistent with reported experimental measurements. Our simulations also show that the Arrhenius pre-exponential factor of escape depends only weakly on the external magnetic field, whereas the pre-exponential factor for collapse is strongly field dependent. Our results open the door for predictive simulations, free from empirical parameters, to aid the design of skyrmion-based information technology.
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| 8. |
- Cederlöf, Gunnel, 1960-
(författare)
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Founding an Empire on India's North-Eastern Frontiers, 1790-1840 : Climate, Commerce, Polity
- 2013
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Bok (refereegranskat)abstract
- This study is a richly detailed historical work of the unsettled half-century from the 1790s to the 1830s when the British East India Company strove to establish control of the colonial north-eastern frontiers spanning the River Brahmaputra to the Burmese border. It offers a much-needed reframing of regional histories of South Asia away from the subcontinental Indian mainland to the varied social ecologies of Sylhet, Cachar, Manipur, Jaintia, and Khasi hills.As a mercantile corporation, the EIC aimed at getting in command of the millennium-old over-land commercial routes connecting India and China. The study specifically engages with the early nineteenth century explorations of trade across Burma. Simultaneously, the Mughal diwani grant compelled the EIC to govern territory. Drawing on extensive research, the study demonstrates the incompatibility of bureaucratic power, the complex socio-economic networks of authority, and the ever-changing landscapes of the region. In a monsoon climate, where rivers moved and land was inundated for months, any attempt to form a uniform administration tended to clash with hybrid landscapes and waterscapes. This work explores how daily administrative and military practice shaped colonial polities and subject formation.Located at the intersection of colonial, legal, and environmental history, the study is of particular interest for scholars and students in history, political ecology, and anthropology.Reframes the regional history of South Asia away from the subcontinental Indian mainlandLocated at the intersection of colonial, environmental, and legal historyIntegrates climate history with socio-political historyBrings present-day north-east India into a wider historical and regional analysisAddresses the gap in research on formative years of the British ruleStudies lesser-known areas like Cachar, Manipur, Tripura, and Jaintia
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| 9. |
- Cederlöf, Gunnel, 1960-
(författare)
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The Art of Throwing a Shoe
- 2014
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Ingår i: Head over Heels. - Uppsala : Uppsala University. - 9789150624120 ; , s. 35-36
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Bokkapitel (populärvet., debatt m.m.)
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| 10. |
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Ecological Nationalisms : Nature, Livelihoods, and Identities in South Asia
- 2014. - 2
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Samlingsverk (redaktörskap) (refereegranskat)abstract
- The works presented in this collection take environmental scholarship in South Asia into novel territory by exploring how questions of national identity become entangled with environmental concerns in Bangladesh, Nepal, Pakistan, and India. The essays provide insight into the motivations of colonial and national governments in controlling or managing nature, and bring into fresh perspective the different kinds of regional political conflicts that invoke nationalist sentiment through claims on nature. In doing all this, the volume also offers new ways to think about nationalism and, more specifically, nationalism in South Asia from the vantage point of interdisciplinary environmental studies. The contributors to this innovative volume show that manifestations of nationalism have long and complex histories in South Asia. Terrestrial entities, imagined in terms of dense ecological networks of relationships, have often been the space or reference point for national aspirations, as shared memories of Mother Nature or appropriated economic, political, and religious geographies. In recent times, different groups in South Asia have claimed and appropriated ancient landscapes and territories for the purpose of locating and justifying a specific and utopian version of nation by linking its origin to their nature-mediated attachments to these landscapes. The topics covered include forests, agriculture, marine fisheries, parks, sacred landscapes, property rights, trade, and economic development. Gunnel Cederlof is associate professor of history, Uppsala University, Sweden. K. Sivaramakrishnan is professor of anthropology and international studies and director of the South Asia Center, Jackson School of International Studies, at the University of Washington. The other contributors are Nina Bhatt, Vinita Damodaran, Claude A. Garcia, Urs Geiser, Goetz Hoeppe, Bengt G. Karlsson, Antje Linkenbach, Wolfgang Mey, Kathleen D. Morrison, J. P. Pascal, and Sarah Southwold-Llewellyn.
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