Henrik Andersen Sveinsson

• Najafi, Fahimeh; Sveinsson, Henrik Andersen; Dreierstad, Christer; Glad, Hans Erlend Bakken & Malthe-Sørenssen, Anders (2023). Modeling the relationship between mechanical yield stress and material geometry using convolutional neural networks. Applied Physics Letters. ISSN 0003-6951. 123(11). doi: 10.1063/5.0160338. Fulltekst i vitenarkiv
• Nordhagen, Even Marius; Sveinsson, Henrik Andersen & Malthe-Sørenssen, Anders (2023). Diffusion-Driven Frictional Aging in Silicon Carbide. Tribology letter. ISSN 1023-8883. 71(3), s. 1–11. doi: 10.1007/s11249-023-01762-z. Fulltekst i vitenarkiv
• Paus-Knudsen, Julie Sørlie; Sveinsson, Henrik Andersen; Grung, Merete; Borgå, Katrine & Nielsen, Anders (2023). The Neonicotinoid Imidacloprid Impairs Learning, Locomotor Activity Levels, and Sucrose Solution Consumption in Bumblebees (Bombus terrestris). Environmental Toxicology and Chemistry. ISSN 0730-7268. 42(6), s. 1337–1345. doi: 10.1002/etc.5611. Fulltekst i vitenarkiv Vis sammendrag

  Bumblebees carry out the complex task of foraging to provide for their colonies. They also conduct pollination, an ecosystem service of high importance to both wild plants and entomophilous crops. Insecticides can alter different aspects of bumblebee foraging behavior, including the motivation to leave the hive, finding the right flowers, handling flowers, and the ability to return to the colony. In the present study, we assessed how the neonicotinoid imidacloprid affects bumblebees' foraging behavior after exposure to four different treatment levels, including field-realistic concentrations (0 [control], 1, 10, and 100 μg/L), through sucrose solution over 9 days. We observed the behavior of several free-flying bumblebees simultaneously foraging on artificial flowers in a flight arena to register the bees' complex behavior postexposure. To conduct a detailed assessment of how insecticides affect bumblebee locomotor behavior, we used video cameras and analyzed the recordings using computer vision. We found that imidacloprid impaired learning and locomotor activity level when the bumblebees foraged on artificial flowers. We also found that imidacloprid exposure reduced sucrose solution intake and storage. By using automated analyses of video recordings of bumblebee behavior, we identified sublethal effects of imidacloprid exposure at field-realistic doses. Specifically, we observed negative impacts on consumption of sucrose solution as well as on learning and locomotor activity level. Our results highlight the need for more multimodal approaches when assessing the sublethal effects of insecticides and plant protection products in general.

• Guren, Marthe Grønlie; Sveinsson, Henrik Andersen; Malthe-Sørenssen, Anders & Renard, Francois (2022). Nanoscale Damage Production by Dynamic Tensile Rupture in α-Quartz. Geophysical Research Letters. ISSN 0094-8276. 49(20). doi: 10.1029/2022GL100468. Fulltekst i vitenarkiv
• Cao, Pinqiang; Sheng, Jianlong; Sveinsson, Henrik Andersen; Wu, Jianyang & Ning, Fulong (2022). Electric Field-Controlled Structural Instability and Mechanical Properties of Methane Hydrates. Crystal Growth & Design. ISSN 1528-7483. 22(5), s. 3107–3118. doi: 10.1021/acs.cgd.2c00008. Vis sammendrag

  Gas hydrates play a significant role in the broad areas of energy applications and climate changes. Furthermore, externally applied fields by charged sediments and artificial activities are of paramount importance for transitions between disordered and ordered gas hydrate systems on the Earth. Herein, the role of external static electric fields in the structural instability and mechanical properties of methane hydrates are explored using molecular dynamics simulation methods. Our simulation results show that mechanical characteristics of methane hydrates such as Young’s modulus, strengths, and failure modes are greatly affected by strengths and imposed directions of external electric fields. Interestingly, strong electric fields can result in the distortion and dissociation of local water cages in methane hydrates mainly due to realignments of water molecules, thereby weakening their mechanical properties. Moreover, instability failure modes of methane hydrates can be attributed to notable reorientations of water molecules and molecular diffusions of water and methane molecules in methane hydrates. This work provides new insights into mechanics of natural crystalline gas hydrates, which is also helpful for understanding the mechanical instability of charged sediment–host natural gas hydrates.

• Sveinsson, Henrik Andersen; Ning, Fulong; Cao, Pinqiang; Fang, Bin & Malthe-Sørenssen, Anders (2021). Grain-Size-Governed Shear Failure Mechanism of Polycrystalline Methane Hydrates. Journal of Physical Chemistry C. ISSN 1932-7447. 125(18), s. 10034–10042. doi: 10.1021/acs.jpcc.1c00901. Fulltekst i vitenarkiv
• Guren, Marthe Grønlie; Sveinsson, Henrik Andersen; Hafreager, Anders; Jamtveit, Bjørn; Malthe-Sørenssen, Anders & Renard, Francois (2021). Molecular dynamics study of confined water in the periclase-brucite system under conditions of reaction-induced fracturing. Geochimica et Cosmochimica Acta. ISSN 0016-7037. 294, s. 13–27. doi: 10.1016/j.gca.2020.11.016. Fulltekst i vitenarkiv
• Cao, Pinqiang; Ning, Fulong; Wu, Jianyang; Cao, Boxiao; Li, Tianshu & Sveinsson, Henrik Andersen [Vis alle 9 forfattere av denne artikkelen] (2020). Mechanical Response of Nanocrystalline Ice-Contained Methane Hydrates: Key Role of Water Ice. ACS Applied Materials & Interfaces. ISSN 1944-8244. 12, s. 14016–14028. doi: 10.1021/acsami.0c00972.
• Sveinsson, Henrik Andersen; Hafreager, Anders; Kalia, Rajiv K.; Nakano, Aiichiro; Vashishta, Priya & Malthe-Sørenssen, Anders (2020). Direct Atomic Simulations of Facet Formation and Equilibrium Shapes of SiC Nanoparticles. Crystal Growth & Design. ISSN 1528-7483. 20(4), s. 2147–2152. doi: 10.1021/acs.cgd.9b00612. Fulltekst i vitenarkiv Vis sammendrag

  Understanding the shapes of nanoparticles is an important interdisciplinary problem because particle shapes can affect their properties, functionality, and applications. Advances in nanoscale imaging probes have revealed exquisite details of nanofaceting phenomena. However, quantitative theoretical predictions have not kept up the pace with experimental advances, and the atomic pathways of facet formation are largely unknown due to a lack of direct observations and simulations. Here we examine facet formation in spherical and cubic SiC nanoparticles and in SiC nanowires using molecular dynamics simulations reaching microseconds. We characterize layer-by-layer formation, diffusional motion along edges and corners, and determine energy barriers. We find that the equilibrium shapes are identical regardless of the initial shape of SiC nanoparticles or nanowires. For spherical and cubic nanoparticles, (110) facets form within 10 ns by lateral liquid-like diffusion of atoms. In contrast, faceting in SiC nanowires also involves normal diffusional motion with a higher energy barrier and hence much longer faceting times. These results have important implications for molecular-level understanding of the synthesis and stability of ceramic nanocrystals and nanowires.

• Thøgersen, Kjetil; Sveinsson, Henrik Andersen; Scheibert, Julien; Renard, Francois & Malthe-Sørenssen, Anders (2019). The Moment Duration Scaling Relation for Slow Rupture Arises From Transient Rupture Speeds. Geophysical Research Letters. ISSN 0094-8276. 46(22), s. 12805–12814. doi: 10.1029/2019GL084436. Fulltekst i vitenarkiv
• Thøgersen, Kjetil; Sveinsson, Henrik Andersen; Amundsen, David Skålid; Scheibert, Julien; Renard, Francois & Malthe-Sørenssen, Anders (2019). Minimal model for slow, sub-Rayleigh, supershear, and unsteady rupture propagation along homogeneously loaded frictional interfaces. Physical Review E (PRE). ISSN 2470-0045. 100(4). doi: 10.1103/PhysRevE.100.043004. Fulltekst i vitenarkiv
• Sveinsson, Henrik Andersen & Malthe-Sørenssen, Anders (2019). Molecular-scale thermally activated fractures in methane hydrates: a molecular dynamics study. Physical Chemistry, Chemical Physics - PCCP. ISSN 1463-9076. 21(25), s. 13539–13544. doi: 10.1039/c9cp01337g. Fulltekst i vitenarkiv
• Trømborg, Jørgen Kjoshagen; Sveinsson, Henrik Andersen; Thøgersen, Kjetil; Scheibert, Julien & Malthe-Sørenssen, Anders (2015). Speed of fast and slow rupture fronts along frictional interfaces. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. ISSN 1539-3755. 92(1). doi: 10.1103/PhysRevE.92.012408.
• Trømborg, Jørgen Kjoshagen; Sveinsson, Henrik Andersen; Scheibert, Julien; Thøgersen, Kjetil; Amundsen, David Skålid & Malthe-Sørenssen, Anders (2014). Slow slip and the transition from fast to slow fronts in the rupture of frictional interfaces. Proceedings of the National Academy of Sciences of the United States of America. ISSN 0027-8424. 111(24), s. 8764–8769. doi: 10.1073/pnas.1321752111.
• Thøgersen, Kjetil; Trømborg, Jørgen Kjoshagen; Sveinsson, Henrik Andersen; Malthe-Sørenssen, Anders & Scheibert, Julien (2014). History-dependent friction and slow slip from time-dependent microscopic junction laws studied in a statistical framework. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. ISSN 1539-3755. 89(5). doi: 10.1103/PhysRevE.89.052401. Fulltekst i vitenarkiv

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• Haraldsrud, Andreas Drolsum; Sveinsson, Henrik Andersen & Løvold, Henrik Hillestad (2020). Programmering i skolen. Universitetsforlaget. ISBN 9788215034287. 320 s.

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• Camposano, Anthony Val Canillas; Sveinsson, Henrik Andersen & Malthe-Sørenssen, Anders (2024). Machine Learning an All-Atom Empirical Force Field for a Water-Silica System. Vis sammendrag

  Molecular modeling of the interaction between silica and water provides a better understanding of how water affects rocks and glasses at the nanoscale. Here, we parametrize a new classical dissociative force field for the water–silica system. We create a classical force field capable of reactive interactions between all chemical species in the water–silica system, using the same functional form by Vashishta et al. to describe bulk water, silica, and silica–water interactions. Using a hierarchical genetic algorithm as a global optimizer and the Nelder-Mead simplex algorithm as a local optimizer, we parameterized the Vashishta force field to reproduce the density, transport properties, and vapor-liquid properties of water. We then used the same method to obtain water–silica interaction parameters to reproduce gas phase orthosilicic geometry and silica surface properties such as silanol concentration, heat of immersion, and the wettability angle of water on a silica surface. For oxygen–silicon interactions in silica, we reuse an existing Vashishta potential parameter set that has been parameterized to reproduce bulk mechanical behavior, surface properties, and fracture properties. Our developed force field can be used to study processes such as dissolution, friction, and stress corrosion fracture in the presence of water over a wide range of thermodynamic conditions for larger-scale and longer-scale simulations.

• Camposano, Anthony Val Canillas; Sveinsson, Henrik Andersen & Malthe-Sørenssen, Anders (2023). Tuning Vashishta Potential for Water.
• Sveinsson, Henrik Andersen & Cao, Pinqiang (2023). Distinct creep regimes of methane hydrates can be predicted by a monatomic water model.
• Sveinsson, Henrik Andersen; Thøgersen, Kjetil & Malthe-Sørenssen, Anders (2023). Grain boundary behavior of hydrate–hydrate and ice—ice bicrystals: molecular dynamics insights.
• Sveinsson, Henrik Andersen (2022). Bruker du denne feil? Med dette trikset kan du kanskje spare litt tid foran mikrobølgeovnen . [Internett]. TV2 Video .
• Sveinsson, Henrik Andersen (2022). Praktisk info med Jon Almaas: Kokosnøtter og sprekkmekanikk. [TV]. TVNorge/Discovery+ .
• Sveinsson, Henrik Andersen; Thøgersen, Kjetil & Malthe-Sørenssen, Anders (2020). Grain boundary behavior of hydrate–hydrate and ice–ice bicrystals: Molecular dynamics insights.
• Sveinsson, Henrik Andersen (2020). Gasshydrater: fra laboratoriekuriositet til klimatrussel. Naturen. ISSN 0028-0887. 144(1–2), s. 38–43. doi: 10.18261/issn.1504-3118.
• Guren, Marthe Grønlie; Zheng, Xiaojiao; Jamtveit, Bjørn; Hafreager, Anders; Sveinsson, Henrik Andersen & Malthe-Sørenssen, Anders [Vis alle 7 forfattere av denne artikkelen] (2019). Molecular dynamics simulations of the hydration force and transport properties of a water film during reaction-induced fracturing.
• Paus-Knudsen, Julie Sørlie; Sveinsson, Henrik Andersen; Aarønes, Malin Røyset; Borgå, Katrine & Nielsen, Anders (2018). Interacting effects of neonicotinoids and temperature on bumblebee (Bombus terrestris) behaviour.
• Sveinsson, Henrik Andersen; Malthe-Sørenssen, Anders & Ning, Fulong (2018). Mechanisms of shear fracture in polycrystalline methane hydrates.
• Thøgersen, Kjetil; Malthe-Sørenssen, Anders; Sveinsson, Henrik Andersen & Scheibert, Julien (2018). Modeling the onset of frictional sliding.
• Sveinsson, Henrik Andersen; Hafreager, Anders; Vashishta, Priya; Malthe-Sørenssen, Anders & Kalia, Rajiv K. (2018). Molecular dynamics simulations of faceting of silicon carbide nanoparticles.
• Malthe-sørenssen, Anders; Sveinsson, Henrik Andersen; Trømborg, Jørgen Kjoshagen; Thøgersen, Kjetil & scheiber, julien (2017). Frictional behavior across scale.
• Sveinsson, Henrik Andersen & Malthe-Sørenssen, Anders (2017). Thermally Activated Slow Crack Evolution in Single Crystal Methane Hydrates.
• Sveinsson, Henrik Andersen & Malthe-Sørenssen, Anders (2016). Molecular dynamics modeling of tensile cracks in methane hydrates. Vis sammendrag

  Production of methane from hydrates is significantly different from producing from a porous matrix, as the material itself disappears during production. Stress heterogeneities arising when methane hydrates dissociate may trigger fractures in the material, and drive further dissociation through fracture of the hydrate. The unstable nature of the gas hydrates renders it di cult to study its mechanical and failure properties experimentally. Even simple characteristics such as the mode I fracture toughness are hard to obtain. In this study, we use molecular dynamics simulations to obtain fracture properties of methane hydrates, with a main focus on crack initiation. We find that on the nanosecond scale, an important crack initiation mechanism is the slow growth of initial cracks due to melting. Rapid cracks start propagating when the system configuration reach a state close to the Griffith fracture criterion from continuum fracture mechanics. The nature of the process taking the system from an uncritical to a critical state is well described by a relation based on Arrhenius’ equation.

• Sveinsson, Henrik Andersen; Trømborg, Jørgen Kjoshagen & Malthe-Sørenssen, Anders (2014). Sommervikar ble toppforsker. [Avis]. Dagens Nærlingsliv.
• Trømborg, Jørgen; Amundsen, David Skålid; Thøgersen, Kjetil; Sveinsson, Henrik Andersen; Scheibert, Julien & Malthe-Sørenssen, Anders (2012). Modelling the Onset of Frictional Sliding.
• Thøgersen, Kjetil; Trømborg, Jørgen; Sveinsson, Henrik Andersen; Malthe-Sørenssen, Anders; Scheibert, Julien & Amundsen, David Skålid (2012). Complex frictional behaviour explained by connecting models at different length scales.
• Mørken, Knut Martin; Sveinsson, Henrik Andersen & Dahl, Lars Oswald (2012). Computing in Science Education (CSE): Numeriske metoder i tverrfaglig og FoU-basert undervisning – gevinster for utdanningen, kandidatene og arbeidslivet.
• Sveinsson, Henrik Andersen (2019). Molecular dynamics modeling of mechanical failure processes in methane hydrates. Det matematisk-naturvitenskapelige fakultet. Fulltekst i vitenarkiv
• Sveinsson, Henrik Andersen & Malthe-Sørenssen, Anders (2015). Molecular Modeling of Fracture in Methane Hydrates. Universitetet i Oslo.

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