Browsing Department of Chemistry by Title
Now showing items 278-297 of 297
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Ultralydsmålinger under høyt trykk - En undersøkelse av solubilisering av 1-heksanol i natrium dodecylsulfat som funksjon av trykk
(Master thesis, 2005)Ny apparatur for lydhastighetsmålinger under trykk har blitt testet, og tilpasset rubidium-klokke teknikk. Det ble deretter gjort studier på solubiliseringsprosessen som funksjon av trykk, der en variert mengde av 1-heksanol ... -
Undersøkelse av effekten av katalysatorer og støttematerialer på omdanningen av lignin til LtL-biooljer ved forskjellige betingelser
(Master thesis, 2014-12-19)Verdens petroleumsforbruk har skutt i været de siste tiårene, og man inser at ressursene holder på å gå tom. Dette har tvunget oss til å begynne å tenke på alternative måter å produsere energi og drivstoff på. Lignocellulosisk ... -
Undersøkelse og optimalisering av krysskoblingsmetatese ved hjelp av statistisk eksperimentelt design og multivariat regresjon
(Master thesis, 2008-06-03)Kryssmetatese er en metode for syntetisering av høyere olefiner fra enkle terminale alkener. Utviklingen av nye katalysatorer har ført til et utvidet bruksområde for denne metoden. Kryssmetatese kan gi tre par produkter, ... -
Undersøking av katalysatorar ved solvolyse av lignin og analysering av produktet ved GC-MS, IR og NMR
(Master thesis, 2011-09-08)Med tanke på at petroleum er ein avgrensa ressurs og det moderne samfunnet er så avhengig av den, er det viktig å finne alternativ. Det er nødvendig med alternativ både til drivstoff og til kjemikalieproduksjon. Solvolyse ... -
Unequivocal structure confirmation of a breitfussin analog by anisotropic NMR measurements
(Journal article; Peer reviewed, 2020)Structural features of proton-deficient heteroaromatic natural products, such as the breitfussins, can severely complicate their characterization by NMR spectroscopy. For the breitfussins in particular, the constitution ... -
Unsaturated and Benzannulated N-Heterocyclic Carbene Complexes of Titanium and Hafnium: Impact on Catalysts Structure and Performance in Copolymerization of Cyclohexene Oxide with CO2
(Journal article; Peer reviewed, 2020)Tridentate, bis-phenolate N-heterocyclic carbenes (NHCs) are among the ligands giving the most selective and active group 4-based catalysts for the copolymerization of cyclohexene oxide (CHO) with CO2. In particular, ligands ... -
Use of herbal products during pregnancy
(Doctoral thesis, 2009-05-27)Background: The use of herbal remedies is gaining popularity in the western world though little scientific documentation for safety and efficacy is available. Women are found to be more frequent users of herbs than men and ... -
The use of surfactant-filled mesoporous silica as an immobilising medium for a fluorescence lifetime pH indicator, providing long-term calibration stability
(Peer reviewed; Journal article, 2019-11-14)Surfactant filled mesoporous silica is applied as a matrix for immobilizing the fluorescence lifetime pH-indicator acridine. We demonstrate that this type of encapsulation provides a stable and uniform chemical environment ... -
Using MUSIC and CC(CO)NH for Backbone Assignment of Two Medium-Sized Proteins Not Fully Accessible to Standard 3D NMR
(Peer reviewed; Journal article, 2014-06-26)The backbone assignment of medium-sized proteins is rarely as straightforward as that of small proteins, and thus often requires creative solutions. Here, we describe the application of a combination of standard 3D ... -
Using Near-Infrared Reflectance Spectroscopy (NIRS) for Qualitative determination of undesirable chemical component of high nitrogen content in protein raw material used for fish feed
(Master thesis, 2018-06-30)Food safety and authenticity are important issue. Ingredients presenting high value are the most vulnerable for adulteration as the common practice is to replace original substance partially with cheap and easily available ... -
Utvikling av metode for å opparbeide organisk materiale frå hydroterminalt sediment til biomarkør-analyse
(Master thesis, 2008-06-09)Det første hydrotermale feltet på store havdjup vart oppdaga utanfor Galapagos i 1977. Det var forventa å finne varmekjelder også på havbotnen, men det ein ikkje forventa å finne var å finne eit rikt liv av virvellaus fauna ... -
Validation strategies for target prediction methods
(Peer reviewed; Journal article, 2019-04-09)Computational methods for target prediction, based on molecular similarity and network-based approaches, machine learning, docking and others, have evolved as valuable and powerful tools to aid the challenging task of mode ... -
Validation study of ReaxFF-optimized geometries in ruthenium compounds
(Master thesis, 2014-03-14)The present thesis, describes a validation study of ReaxFF-optimized geometries, through statistical tools (i) weighted root mean square of distances and (ii) interatomic distances having as reference 786 X-ray and 11 DFT ... -
Variability in the formation and framework polymorphism of metal-organic frameworks based on yttrium(III) and the bifunctional organic linker 2,5-dihydroxyterephthalic acid
(Journal article; Peer reviewed, 2021)Depending on the solvothermal reaction conditions, we obtained three different metal‐organic frameworks with yttrium(III) as metal component and 2,5‐dihdyroxyterepthalic acid (H4dhtp) as bifunctional organic linker: ... -
Variable importance: Comparison of selectivity ratio and significance multivariate correlation for interpretation of latent‐variable regression models
(Journal article; Peer reviewed, 2020)This work examines the performance of significance multivariate correlation (sMC) and selectivity ratio (SR) for ranking variables according to their importance in latent-variable regressions (LVRs) models. Both indices ... -
Variable selection optimization for multivariate classification of metabolomics data
(Master thesis, 2013-05-21)Variable selection is an important step in multivariate calibration in which the number of variables in the independent variable matrix is reduced by eliminating those that are not related to the response. Many methods ... -
Viscosity and Viscoelastic Properties in Hydrophobically Modified Polymers for Enhanced Oil Recovery
(Doctoral thesis, 2019-01-25)Polymers have been studied and used for mobility control since the 1960s and found to improve the mobility ratio between the injected fluid and the displaced oil. However, small changes in polymer structure and/or relation ... -
Volumetric properties of the nucleosides adenosine, cytidine, and uridine in aqueous solution at T = (288.15 and 313.15) K and p = (10 to 100) MPa
(Journal article; Peer reviewed, 2019)Speeds of sound have been measured for aqueous solutions of the nucleosides adenosine, cytidine, and uridine at the temperatures T = (288.15 and 313.15) K and at the pressures p = (10, 20, 40, 60, 80, and 100) MPa. Using ... -
Wetting in Porous Media: A Nuclear Magnetic Resonance Study.
(Doctoral thesis, 2020-06-30)The purpose of this thesis has been to study mechanisms responsible for wettability alteration on reservoir minerals and then to study how surface wettability affects the distribution of immiscible liquids in porous media. ... -
Z-Selective Monothiolate Ruthenium Indenylidene Olefin Metathesis Catalysts
(Journal article; Peer reviewed, 2020)Ru-alkylidenes bearing sterically demanding arylthiolate ligands (SAr) constitute one of only two classes of catalyst that are Z-selective in metathesis of 1-alkenes. Of particular interest are complexes bearing pyridine ...