| 1. |
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| 2. |
- Jedvert, Kerstin, et al.
(författare)
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Adsorption Studies of Amino Cellulose on Cellulosics
- 2017
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Ingår i: Macromolecular materials and engineering. - : Wiley. - 1438-7492 .- 1439-2054. ; 302:7
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Tidskriftsartikel (refereegranskat)abstract
- Adsorption of a typical example of a new class of amino cellulose, namely 6-deoxy-6-(2-aminoethyl)amino cellulose at different pH-values and in the presence of electrolytes, onto cellulose model substrates is studied with surface plasmon resonance and quartz crystal microbalance with dissipation monitoring. Unexpectedly, adsorption is consistently higher at a higher pH-value of 10, indicating that solubility and interactions between amine moieties and cellulose are more important than electrostatic interactions. The findings are highly relevant for the process to modify material surfaces with amino cellulose in water-based systems as a universal tool for changing the surface properties and chemistry. Potential applications for an antimicrobial all biobased material could be found, e.g., as medical textiles or in the biotechnology sector.
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| 3. |
- Achtel, Christian, et al.
(författare)
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Dissolution capacity of novel cellulose solvents based on triethyloctylammonium chloride
- 2017
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Ingår i: Macromolecular Chemistry and Physics. - : Wiley. - 1022-1352 .- 1521-3935. ; 218:21
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Tidskriftsartikel (refereegranskat)abstract
- Dissolution of cellulose from various sources (microcrystalline cellulose and different dissolving grade pulp fibers) is investigated in solvent systems based on triethyl(n-octyl)ammonium chloride (N2228Cl). Clear cellulose solutions are obtained with N2228Cl in a variety of solvents, e.g., dimethyl sulfoxide, N,N-dimethylacetamide, and acetone. It is possible to prepare clear cellulose solutions from pulp fibers with concentrations up to 15 wt%. However, it is found that the cellulose is degraded, especially when neat (i.e., molten) N2228Cl is used as a solvent. The present work includes comprehensive rheological characterization of the cellulose solutions, both with shear and extensional rheology. In most cases, the viscosity values are low (complex viscosities below 100 Pa s for 5–10 wt% dissolved cellulose), and the solutions show more Newtonian than viscoelastic behavior.
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| 4. |
- Achtel, Christian, et al.
(författare)
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Surprising Insensitivity of Homogeneous Acetylation of Cellulose Dissolved in Triethyl(n-octyl)ammonium Chloride/Molecular Solvent on the Solvent Polarity
- 2018
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Ingår i: Macromolecular materials and engineering. - : Wiley-VCH Verlag. - 1438-7492 .- 1439-2054. ; 303:5
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Tidskriftsartikel (refereegranskat)abstract
- The homogeneous acetylation of microcrystalline cellulose (MCC) by acetyl chloride and acetic anhydride in triethyl(n-octyl)ammonium chloride (N2228Cl)/molecular solvents (MSs) is investigated. The reaction with both acylating agents shows the expected increase of the degree of substitution (DS) on reaction temperature and time. Under comparable reaction conditions, however, DS is surprisingly little dependent on the MS employed, although the MSs differ in empirical polarity by 7 kcal mol−1 as calculated by use of solvatochromic probes. The empirical polarities of (MCC + N2228Cl + MS) differ only by 0.8 kcal mol−1. The formation a polar electrolyte sheath around cellulose chains presumably contributes to this “leveling-off†of the dependence DS on the polarity of the parent MS employed. N2228Cl recovery and recycling is feasible. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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| 5. |
- Graham, Jesse R., et al.
(författare)
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The pipeline project: Pre-publication independent replications of a single laboratory's research pipeline
- 2016
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Ingår i: Journal of Experimental Social Psychology. - : Elsevier. - 1096-0465 .- 0022-1031. ; 66, s. 55-67
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Tidskriftsartikel (refereegranskat)abstract
- This crowdsourced project introduces a collaborative approach to improving the reproducibility of scientific research, in which findings are replicated in qualified independent laboratories before (rather than after) they are published. Our goal is to establish a non-adversarial replication process with highly informative final results. To illustrate the Pre-Publication Independent Replication (PPIR) approach, 25 research groups conducted replications of all ten moral judgment effects which the last author and his collaborators had “in the pipeline” as of August 2014. Six findings replicated according to all replication criteria, one finding replicated but with a significantly smaller effect size than the original, one finding replicated consistently in the original culture but not outside of it, and two findings failed to find support. In total, 40% of the original findings failed at least one major replication criterion. Potential ways to implement and incentivize pre-publication independent replication on a large scale are discussed.
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| 6. |
- Hallonsten, Olof, et al.
(författare)
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Formation and expansion of a new organizational field in experimental science
- 2015
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Ingår i: Science and Public Policy. - : Oxford University Press (OUP). - 1471-5430 .- 0302-3427. ; 42:6, s. 841-854
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Tidskriftsartikel (refereegranskat)abstract
- This paper examines the formation and expansion of a new organizational field in experimental science: synchrotron radiation laboratories. These labs were once peripheral servants of some specialisms of solid-state physics, but over the 40 years studied they have grown into a worldwide generic resource for tens of thousands of users in a broad spectrum of disciplines. The paper uses insights primarily from historical institutionalism, but also neo-institutional theory, to analyze the formation and expansion of the organizational field of synchrotron radiation laboratories, and thus contributes to the analysis of the rather dramatic growth of this tool for experimental science from a small-scale lab curiosity to a generic research technology. But the key contribution of the paper is to provide insights into multi-level and multi-dimensional change in science systems by analyzing the emergence and expansion of a new organizational field in experimental science, which has implications not least for science policy.
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| 7. |
- Heinze, Thomas, et al.
(författare)
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From Periphery to Center: Synchrotron Radiation at DESY : Part I: 1962–1977
- 2015
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Ingår i: Historical Studies in the Natural Sciences. - : University of California Press. - 1939-1811 .- 1939-182X. ; 45:3, s. 447-492
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Tidskriftsartikel (refereegranskat)abstract
- In its fifty-year history, the German national research laboratory DESY (Deutsches Elektronen-Synchrotron, German Electron Synchrotron) has undergone a gradual transformation from a single-mission particle physics laboratory to a multi-mission research center for accelerator physics, particle physics, and photon science. The last is an umbrella term for research using synchrotron radiation and, in later years, free-electron laser. Synchrotron radiation emerged initially as a peripheral part of the laboratory activities but grew to become a central experimental activity at DESY via a series of changes in the organizational, scientific, and infrastructural setup of the lab, and in its contextual scientific, political, and societal environment. This article chronicles the first sixteen years (1962-77) of the history of synchrotron radiation at DESY and its gradual transformation from peripheral and parasitic to a regular and recognized research program. The article complements previous writings on DESY history by focusing on synchrotron radiation, and it adds to the body of knowledge about the crucial renewal of Big Science laboratories toward the end of the twentieth century. This renewal culminated in the close-down of several particle physics machines in the early 2000s and their replacement by facilities dedicated to the study of the structure, properties, and dynamics of matter by the interaction with vacuum ultraviolet/X-ray photons. Therefore, this article contributes to the knowledge about the emergence and growth of synchrotron radiation as a laboratory resource, the understanding of processes of renewal in Big Science, and the general history of late-twentieth-century science.
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| 8. |
- Heinze, Thomas, et al.
(författare)
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From Periphery to Center: Synchrotron Radiation at DESY, Part II: 1977–1993
- 2015
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Ingår i: Historical Studies in the Natural Sciences. - : University of California Press. - 1939-1811 .- 1939-182X. ; 45:3, s. 513-548
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Tidskriftsartikel (refereegranskat)abstract
- In its fifty-year history, the German national research laboratory DESY (Deutsches Elektronen-Synchrotron, German Electron Synchrotron) has undergone a gradual transformation from a single-mission particle physics laboratory to a multi-mission research center for accelerator physics, particle physics, and photon science. The last is an umbrella term for research using synchrotron radiation and, in later years, free-electron laser. Synchrotron radiation emerged initially as a peripheral part of the laboratory activities but grew to become a central experimental activity at DESY via a series of changes in the organizational, scientific, and infrastructural setup of the lab, and in its contextual scientific, political, and societal environment. Together with an earlier publication on the issue in this journal, 1 this article chronicles the first thirty years in the history of synchrotron radiation at DESY. The focus is on the gradual transformation of DESY's research program in synchrotron radiation from peripheral and parasitic into mainstream and mission. We provide insights about the crucial renewal of Big Science laboratories toward the end of the twentieth century. This renewal culminated in the close-down of several particle physics machines in the early 2000s and their replacement by facilities dedicated to the study of the structure, properties, and dynamics of matter by the interaction with vacuum ultraviolet and X-ray photons. Therefore, we contribute to better understanding the growth of synchrotron radiation as a laboratory resource, and processes of renewal in Big Science as part of the general history of late-twentieth-century science.
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| 9. |
- Heinze, Thomas, et al.
(författare)
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From Periphery to Center: Synchrotron Radiation at DESY, Part II: 1977—1993
- 2015
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Ingår i: Historical Studies in the Natural Sciences. - : University of California Press. - 1939-182X .- 1939-1811. ; 45:4, s. 513-548
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Tidskriftsartikel (refereegranskat)abstract
- In its fifty-year history, the German national research laboratory DESY (Deutsches Elektronen-Synchrotron, German Electron Synchrotron) has undergone a gradual transformation from a single-mission particle physics laboratory to a multi-mission research center for accelerator physics, particle physics, and photon science. The last is an umbrella term for research using synchrotron radiation and, in later years, free-electron laser. Synchrotron radiation emerged initially as a peripheral part of the laboratory activities but grew to become a central experimental activity at DESY via a series of changes in the organizational, scientific, and infrastructural setup of the lab, and in its contextual scientific, political, and societal environment. Together with an earlier publication on the issue in this journal,1 this article chronicles the first thirty years in the history of synchrotron radiation at DESY. The focus is on the gradual transformation of DESY’s research program in synchrotron radiation from peripheral and parasitic into mainstream and mission. We provide insights about the crucial renewal of Big Science laboratories toward the end of the twentieth century. This renewal culminated in the close-down of several particle physics machines in the early 2000s and their replacement by facilities dedicated to the study of the structure, properties, and dynamics of matter by the interaction with vacuum ultraviolet and X-ray photons. Therefore, we contribute to better understanding the growth of synchrotron radiation as a laboratory resource, and processes of renewal in Big Science as part of the general history of late-twentieth-century science.
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| 10. |
- Heinze, Thomas, et al.
(författare)
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The reinvention of the SLAC National Accelerator Laboratory, 1992–2012
- 2018
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Ingår i: History and Technology. - : Informa UK Limited. - 0734-1512 .- 1477-2620. ; 33:3, s. 300-332
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Tidskriftsartikel (refereegranskat)abstract
- This article examines the most recent history of the SLAC National Accelerator Laboratory, with particular emphasis on how this laboratory shifted its research program from accelerator-based particle physics towards astroparticle physics, cosmology and multi-disciplinary photon science. Photon science became the central experimental research program through a series of changes in the organisational, scientific, and infrastructural set-up and in its science policy context. The article shows that SLAC’s reinvention unfolded in a science policy context in which funding priorities drifted towards the materials sciences and the life sciences at the expense of nuclear and particle physics, which had dominated science budgets during the Cold War. SLAC took a lead position in this global development by partly dismantling and also redeploying scientific and technical capabilities from its particle physics program for these new fields, thus, providing novel experimental facilities for user communities to expand across academia and industry.
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