| 1. |
- Lomb, Lukas, et al.
(author)
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Radiation damage in protein serial femtosecond crystallography using an x-ray free-electron laser
- 2011
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In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 84:21, s. 214111-1-214111-6
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Journal article (peer-reviewed)abstract
- X-ray free-electron lasers deliver intense femtosecond pulses that promise to yield high resolution diffraction data of nanocrystals before the destruction of the sample by radiation damage. Diffraction intensities of lysozyme nanocrystals collected at the Linac Coherent Light Source using 2 keV photons were used for structure determination by molecular replacement and analyzed for radiation damage as a function of pulse length and fluence. Signatures of radiation damage are observed for pulses as short as 70 fs. Parametric scaling used in conventional crystallography does not account for the observed effects.
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| 2. |
- Bergstrand, Fredrik, 1983, et al.
(author)
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Leveraging Bystander Reports in Emergency Response Work: Framing Emergency Managers Social Media Use
- 2016
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In: Proceedings of the Annual Hawaii International Conference on System Sciences. - 9780769556703
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Conference paper (peer-reviewed)abstract
- This paper considers empirical data gathered on the use of social media and online bystander reports in operative emergency response work. Interviews with 12 emergency response professionals have been conducted in order to understand the role of social media, as we need to look at how professional actors use and make sense of this technology as part of their work. Focus is on the use, interpretation, and experiences of bystander reports in early phases of emergency events. The findings of a frame analysis suggest that bystander reports present both new opportunities and challenges to this time-critical work by providing information otherwise not available. These reports also change how emergencies are communicated. Leveraging bystander reports is not yet an organizational capability, but rather a technique used by individuals engaged in emerging practices. Textual information is often considered ambiguous and hard to interpret, while experienced professionals leverage visible information in photographs to make their own interpretations of ongoing emergency events.
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| 3. |
- Bergstrand, Fredrik, 1983, et al.
(author)
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Organizations Don't Tweet, Employees Do!
- 2013
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In: Workshop on Informing Future Design via Large-Scale Research Methods and Big Data. MobileHCI 2013.
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Conference paper (other academic/artistic)abstract
- The research presented in this paper explores government authorities’ use of social media. An exploratory approach has been used to identify characteristics of online interactions over an extended period of time. The data consists of communications and interactions of Twitter accounts belonging to a multitude of Swedish government authorities, ranging from top-level accounts of formal agencies, to accounts belonging to employees stating a formal position at a government agency. The findings show that there is a large diversity in the characteristics of government accounts. The focus of the paper is to presents an account type typology that represents government authorities presence on social media services. The authors believes that acknowledging these differences are an important step in theorizing the role of social media in crisis communication and for future research on social media use in emergency and crisis management practices.
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| 4. |
- Dubrovinskaia, NA, et al.
(author)
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Thermal expansion of chromium (Cr) to melting temperature
- 1997
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In: CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0364-5916. ; 21:4, s. 497-508
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Journal article (other academic/artistic)abstract
- In situ x-ray data on molar volumes of chromium have been collected over the temperature range from 300 K to melting. The sample was heated to melting by passing an electrical current through the sample (the technique of electrical resistance wire heating
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| 7. |
- Gyllensten, Amaru Cuba, et al.
(author)
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Measuring Issue Ownership using Word Embeddings
- 2018
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Other publication (other academic/artistic)abstract
- Sentiment and topic analysis are commonmethods used for social media monitoring.Essentially, these methods answers questionssuch as, “what is being talked about, regardingX”, and “what do people feel, regarding X”.In this paper, we investigate another venue forsocial media monitoring, namely issue ownership and agenda setting, which are conceptsfrom political science that have been used toexplain voter choice and electoral outcomes.We argue that issue alignment and agenda setting can be seen as a kind of semantic sourcesimilarity of the kind “how similar is sourceA to issue owner P, when talking about issue X”, and as such can be measured usingword/document embedding techniques. Wepresent work in progress towards measuringthat kind of conditioned similarity, and introduce a new notion of similarity for predictive embeddings. We then test this methodby measuring the similarity between politically aligned media and political pparties, conditioned on bloc-specific issues.
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| 9. |
- Jonoobi, Mehdi, et al.
(author)
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Chemical composition, crystallinity and thermal degradation of bleached and unbleached kenaf bast (Hibiscus cannabinus) pulp and nanofiber
- 2009
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In: BioResources. - 1930-2126. ; 4:2, s. 626-639
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Journal article (peer-reviewed)abstract
- Kenaf (Hibiscus cannabinus) nanofibers were isolated from unbleached and bleached pulp by a combination of chemical and mechanical treatments. The chemical methods were based on NaOH-AQ (anthraquinone) and three-stage bleaching (DEpD) processes, whereas the mechanical techniques involved refining, cryo-crushing, and high-pressure homogenization. The size and morphology of the obtained fibers were characterized by environmental scanning electron microscopy (ESEM) and transmission electron microscopy (TEM), and the studies showed that the isolated nanofibers from unbleached and bleached pulp had diameters between 10-90 nm, while their length was in the micrometer range. Fourier transform infrared (FTIR) spectroscopy demonstrated that the content of lignin and hemicellulose decreased in the pulping process and that lignin was almost completely removed during bleaching. Moreover, thermogravimetric analysis (TGA) indicated that both pulp types as well as the nanofibers displayed a superior thermal stability as compared to the raw kenaf. Finally, X-ray analyses showed that the chemo-mechanical treatments altered the crystallinity of the pulp and the nanofibers: the bleached pulp had a higher crystallinity than its unbleached counterpart, and the bleached nanofibers presented the highest crystallinity of all the investigated materials.
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