1,603 research outputs found
Jens Christian Grøndahl
No full textThis is a short presentation of the main works of the Danish author Jens Christian Grøndahl
Jens August Schade
No full textShort presentation of Danish author Jens August Schade and his main work
Interview with Jens Zimmermann: Author of ‘Hermeneutics: A Very Short Introduction’
No full textDr. Jens Zimmermann is a German-Canadian philosopher and J.I. Packer Professor of Theology at Regent College. As the author of Hermeneutics: A Very Short Introduction, he held a lecture titled “Gadamer, Ricoeur and the Future of Philosophical Hermeneutics” at SFU. Hosted by the Department of World Languages and Literatures, the lecture focused on how we can use the art of hermeneutics to interpret literature and our identities of being human
Native lignin extraction from soft- and hardwood by green and benign sub/supercritical fluid extraction methodologies
No full textLignin constitutes an impressive resource of high-value low molecular weight compounds. However, robust methods for isolation of the extractable fraction from lignocellulose are yet to be established. In this study, supercritical fluid extraction (SFE) and CO2-expanded liquid extraction (CXLE) were employed to extract lignin from softwood and hardwood chips. Ethanol, acetone, and ethyl lactate were investigated as green organic co-solvents in the extractions. Additionally, the effects of temperature, CO2 percentage and the water content of the co-solvent were investigated using a design of experiment approach employing full factorial designs. Ethyl lactate and acetone provided the highest gravimetric yields. The water content in the extraction mixture had the main impact on the amount of extractable lignin monomers (LMs) and lignin oligomers (LOs) while the type of organic solvent was of minor importance. The most effective extraction was achieved by using a combination of liquid CO2/acetone/water (10/72/18, v/v/v) at 60 °C, 350 bar, 30 min and 2 mL min−1 flow rate. The optimized method provided detection of 13 LMs and 6 lignin dimers (LDs) from the hardwood chips. The results demonstrate the potential of supercritical fluids and green solvents in the field of mild and bening lignin extraction from wood
Advanced pharmaceutical solids / Jens T. Carstensen.
No full textIncludes bibliographical references and index.viii, 518 pages :Explores the principles, instrumentation, processes, and programs of pharmaceutical solid science as well as fresh aspects on one-component systems, micromeritics, polymorphism, solid-state stability, cohesion, powder flow, blending, single-unit sustained release, and tablet coatin
Reputation and Organizational Politics: Inside the EU Commission
No full textThe replication data contains the data and do-file necessary to replicate the results presented in "Reputation and Organizational Politics: Inside the European Commission" by Jens Blom-Hansen and Daniel Finke, forthcoming in the Journal of Politics. Corresponding Author: Jens Blom-Hansen, [email protected].
The raw data is a report of the activities recorded in the CIS-net data base operated by the European Commission in 2015 and 2016 (cisnet20152016_jop.dta). The CIS-net data base is further described in the article
Reputation and Organizational Politics: Inside the EU Commission
No full textThe replication data contains the data and do-file necessary to replicate the results presented in "Reputation and Organizational Politics: Inside the European Commission" by Jens Blom-Hansen and Daniel Finke, forthcoming in the Journal of Politics. Corresponding Author: Jens Blom-Hansen, [email protected].
The raw data is a report of the activities recorded in the CIS-net data base operated by the European Commission in 2015 and 2016 (cisnet20152016_jop.dta). The CIS-net data base is further described in the article
Text-fig. 4. Coccal bacteria within the grey crust covering the fetus of Propalaeotherium voigti from Eckfeld. SEM photo by Marie-Louise Tritz and author (both Senckenberg Research Institute Frankfurt). in Report On The Discovery Of Fossil Mares With Preserved Uteroplacenta From The Eocene Of Germany
No full textText-fig. 4. Coccal bacteria within the grey crust covering the fetus of Propalaeotherium voigti from Eckfeld. SEM photo by Marie-Louise Tritz and author (both Senckenberg Research Institute Frankfurt).Published as part of Franzen, Jens Lorenz, 2017, Report On The Discovery Of Fossil Mares With Preserved Uteroplacenta From The Eocene Of Germany, pp. 67-75 in Fossil Imprint 73 (1-2) on page 69, DOI: 10.2478/if-2017-0003, http://zenodo.org/record/458624
Sur la querelle de l'Akakia. Une lettre inconnue de Montesquieu à Maupertuis, présentée
No full textJens Hàseler : The Akakia Dispute. An unknown letter from Montesquieu
to Maupertuis.
This unpublished letter from Montesquieu to Maupertuis, dated 26th January 1754, found in the archives of the Paris Académie des Sciences, throws new light on the good relations that existed between the two philosophes. In particular it shows support for Maupertuis's position in the Docteur Akakia dispute and it adds to the small number of his supporters in France. In it La Condamine is revealed as a tireless intermediary between the President of the Prussian Academy and the author of the Esprit des Lois.Häseler Jens. Sur la querelle de l'Akakia. Une lettre inconnue de Montesquieu à Maupertuis, présentée. In: Dix-huitième Siècle, n°26, 1994. Economie et politique. pp. 223-226
Analysis of lignin monomers and oligomers in technical lignins using chromatography and mass spectrometry
No full textLignin is the most abundant aromatic biopolymer on earth and has the potential to play an important role in the transition from an oil-based refinery to a biorefinery-based industry. The isolation of lignin from the biomass can be achieved by several different technical processes and isolated lignins are referred to as technical lignins in literature. During the last decades, the conversion of technical lignins into economically valuable aromatic chemicals became a growing research interest.For the understanding of the chemical nature of technical lignins and the understanding of the chemical reactions occurring during conversion processes, selective and sensitive analytical methods are crucial. Therefore, analytical methods using liquid chromatography (LC) and supercritical fluid chromatography (SFC) coupled to electrospray ionisation–mass spectrometry (ESI–MS) were developed in this thesis work. Main emphases were set on the optimisation of the ESI of lignin monomers (LMs), the identification of unknown LMs and lignin oligomers (LOs) in complex technical lignin samples and on the separation of LMs and LOs using SFC.Several ESI parameters were studied for the ionisation of LMs to identify which ESI parameters have significant influences. First, the ESI of a wide range of LMs were studied using SFC/ESI–MS, then the influence of specific ESI parameters on different groups of LMs was analysed. Significant ESI parameters, such as the concentration of the makeup solvent additive or the desolvation gas temperature, were identified as significant parameters for the ESI of a wide range of LMs. Furthermore, it has been shown that for the different groups of LMs, different ESI parameters are of importance. For instance, compounds with two methoxy groups seem to need more desolvation energy compared to compounds with one or no methoxy groups.The identification of unknown LMs and LOs in technical lignin samples using MS is very challenging due to the very complex sample mixtures and the lack of commercially available reference standards. Therefore, a non-targeted analysis strategy using SFC/ESI–high-resolution multiple stage tandem MS combined with Kendrick mass defect-based principal component analysis–quadratic discriminant analysis classification models was developed. The developed method assures an identification confidence of level 3 without the need of reference standards and without the study of MS fragmentation patterns. Furthermore, it was demonstrated that a higher identification confidence level and tentative chemical structures can be obtained with multiple stage tandem MS.For the characterisation of unknown compounds in complex samples, clean mass spectra of the investigated compound are useful. In this work, the application of SFC for the separation of LMs and LOs has been investigated using a stationary phase screening approach. It was found that a SFC stationary phase with both hydrogen bonding and π-π-interaction chemistries offers the highest overall resolution power combined with a selective separation of LMs and lignin dimers
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