Browsing NTNU Open by Title

Hydrothermal Synthesis of Alkali Niobates

Vadseth, Daniel Stormer (Master thesis, 2021)

Reaksjonsforholdene under hydrotermal syntese av kalium- og natriumniobater har blitt undersøkt med hensikt å forstå effekten av reaksjonsforholdene på kinetikken, faseformasjonen, morfologien og gitteparametrene. Kalium ...

Hydrothermal synthesis of hexagonal YMnO3 and YbMnO3 below 250 °C

Marshall, Kenneth Paul; Eidem, Sigurd Opdal; Småbråten, Didrik Rene; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2021)

The hydrothermal synthesis of hexagonal YMnO3 and YbMnO3 are reported using high KOH mineraliser concentrations (>10 M) and low temperatures (<240 °C). The relation between reaction parameters and resulting phase purity ...

Hydrothermal Synthesis of LaFeO3

Reksten, Anita (Master thesis, 2011)

This work explores the hydrothermal synthesis of LaFeO3 (LFO) nanorods with a high aspect ratio. Synthesis of rod shaped LFO is a stepping stone to the synthesis of strontium doped LFO (LSF) nanorods with high aspect ratio. ...

Hydrothermal synthesis of materials for intermediate band solar cells

Mikalsen, Ragni Fjellgaard (Master thesis, 2013)

Solar energy is an abundant energy source that may provide an environmentallyfriendly alternative to fossil fuels. The utilization of the solar energy have so farbeen limited by various energy losses in the photovoltaic ...

Hydrothermal synthesis of SrxBa1–xNb2O6 on nanostructured substrates

Einarsrud, Mari-Ann (Master thesis, 2019)

I nyere tid har syntese av bly-frie ferroelektriske materialer tiltrukket seg stadig mer oppmerksomhet og et av de studerte materialene er strontium barium niobat (SBN). SBN har vist gode elektro-optiske egenskaper, samt ...

Hydrotreating of Bio-Oils over Metal-Phosphide Catalysts

Carlsen, Christina (Master thesis, 2012)

A concern over the impact of fossil fuels on the environment has made the researchers to look for more environmental options. One alternative is bio-oils produced from lignocellulosic material. However, the abundance of ...

Hydroxyl airglow observations for investigating atmospheric dynamics: Results and challenges

Wüst, Sabine; Bittner, Michael; Espy, Patrick Joseph; French, W. John R.; Mulligan, Frank J. (Peer reviewed; Journal article, 2023)

Measurements of hydroxyl (OH*) airglow intensity are a straightforward and cost-efficient method which allows the derivation of information about the climate and dynamics of the upper mesosphere/lower thermosphere (UMLT) ...

Hydroxyl Functionalized Pyridinium Ionic Liquids: Experimental and Theoretical Study on Physicochemical and Electrochemical Properties

Kallidanthiyil Chellappan, Lethesh; Venkatraman, Vishwesh; Fiksdahl, Anne; Evjen, Sigvart (Journal article; Peer reviewed, 2019)

Structurally modified hydroxyl functionalized pyridinium ionic liquids (ILs), liquid at room temperature, were synthesized and characterized. Alkylated N-(2-hydroxyethyl)-pyridinium ILs were prepared from alkylpyridines ...

Hygienic standards and practices in Norwegian salmon Processing plants

Løvdal, Trond; Giske, Lars André Langøyli; Bjørlykhaug, Emil; Eri, Ingrid B.; Mork, Ola Jon (Journal article; Peer reviewed, 2017)

The farmed salmon industry is important economically for several countries with Norway as the main producer constituting 53% of the world total. Bacterial contamination of salmon products may occur during processing, ...

HyGreGel: A new class of gel systems for water diversion by in-depth reservoir placement

Najafiazar, Bahador (Doctoral theses at NTNU;2019:336, Doctoral thesis, 2019)

High water production is typically a major problem late in the life cycle of a water flooded hydrocarbon reservoir. Reservoir heterogeneity plays a significant role in creating this problem. An example is highly permeable ...

Hygroscopic buffering effects in exposed cross-laminated timber surfaces and indoor climate in a Norwegian primary school

Skulberg, Knut Ragnvald; Nyrud, Anders Q.; Nore, Kristine (Peer reviewed; Journal article, 2022)

Laboratory studies have shown that wood has hygroscopic properties. When used as a construction material in buildings, it can thus influence indoor relative humidity and temperature. Ventilation can affect indoor climate ...

Hygrothermal Aging of Amine Epoxy: Reversible Static and Fatigue Properties

Krauklis, Andrey; Gagani, Abedin; Echtermeyer, Andreas (Journal article; Peer reviewed, 2018)

Fiber-reinforced polymers (FRP) are widely used in structural applications. Long-term properties of such materials exposed to water are of high concern and interest, especially for subsea and offshore applications. The ...

Hygrothermal Modeling of Masonry with Interior Insulation Retrofit - Perspectives on hygrothermal performance and modeling-uncertainty

Knarud, Jon Ivar Belghaug (Doctoral theses at NTNU;2024:43, Doctoral thesis, 2024)

Energy retrofit of existing buildings is mainly an endeavor to reduce energy consumption. Interior insulation retrofit of masonry falls among retrofit measures in this regard. However, interior insulation of masonry may ...