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Träfflista för sökning "AMNE:(TEKNIK OCH TEKNOLOGIER) AMNE:(Materialteknik) srt2:(2020-2024)"

Search: AMNE:(TEKNIK OCH TEKNOLOGIER) AMNE:(Materialteknik) > (2020-2024)

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  • Hossain, Md Shakhawath, et al. (author)
  • Aggregation Behavior of Medium Chain Fatty Acids Studied by Coarse-Grained Molecular Dynamics Simulation
  • 2019
  • In: AAPS PharmSciTech. - : SPRINGER. - 1530-9932. ; 20
  • Journal article (peer-reviewed)abstract
    • Medium chain fatty acids (MCFA) are digestion products of lipid-rich food and lipid-based formulations, and they are used as transient permeability enhancers in formulation of poorly permeable compounds. These molecules may promote drug absorption by several different processes, including solubilization, increased membrane fluidity, and increased paracellular transport through opening of the tight junctions. Therefore, understanding the aggregation behavior of MCFAs is important. A number of studies have measured the critical micelle concentration (CMC) of MCFAs experimentally. However, CMC is highly dependent on system conditions like pH, temperature, and the ionic strength of the buffer used in different experimental techniques. In this study, we investigated the aggregation behavior of four different MCFAs using the coarse-grained molecular dynamics (CG-MD) simulations with the purpose to explore if CG-MD can be used to study MCFA interactions occurring in water. The ratio of deprotonated and non-charged MCFA molecules were manipulated to assess aggregation behavior under different pH conditions and within the box sizes of 22x22x44nm(3) and 44nm(3) for 1s. CMCs were calculated by performing CG-MD simulations with an increasing number of MCFAs. The resulting aggregate size distribution and number of free MCFA molecules were used to determine the CMC. The CMCs from simulations for C-8, C-10, and C-12 were 1.8-3.5-fold lower than the respective CMCs determined experimentally by the Wilhelmy method. However, the variation of MCFA aggregate sizes and morphologies at different pH conditions is consistent with previous experimental observation. Overall, this study suggests that CG-MD is suitable for studying colloidal systems including various MCFAs.
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  • Guiver, Michael D., et al. (author)
  • Gas Transport in a Polymer of Intrinsic Microporosity (PIM-1) Substituted with Pseudo-Ionic Liquid Tetrazole-Type Structures
  • 2020
  • In: Macromolecules. - : American Chemical Society (ACS). - 0024-9297 .- 1520-5835. ; 53:20, s. 8951-8959
  • Journal article (peer-reviewed)abstract
    • We report a side group modification strategy to tailor the structure of a polymer of intrinsic microporosity (PIM-1). PIM-1 with an average of similar to 50% of the repeat units converted to tetrazole is prepared, and a subsequent reaction then introduces three types of pseudo-ionic liquid tetrazole-like structures (PIM-1-ILx). The presence of pseudo-ionic liquid functional groups in the PIM-1 structure increases gas selectivities for O-2/N-2 and CO2/N-2, while it decreases pure-gas permeabilities. The overall gas separation performance of PIM-1-ILx is close to the 2008 Robeson upper bound. Since the tetrazoles are versatile groups for building a wide variety of ionic liquids, the modification method can be expanded to explore a broad spectrum of functional groups.
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  • Johansen, Anders, et al. (author)
  • A pebble accretion model for the formation of the terrestrial planets in the solar system
  • 2021
  • In: Science Advances. - : American Association for the Advancement of Science (AAAS). - 2375-2548. ; 7:8
  • Journal article (peer-reviewed)abstract
    • Pebbles of millimeter sizes are abundant in protoplanetary discs around young stars. Chondrules inside primitive meteorites - formed by melting of dust aggregate pebbles or in impacts between planetesimals - have similar sizes. The role of pebble accretion for terrestrial planet formation is nevertheless unclear. Here, we present a model where inward-drifting pebbles feed the growth of terrestrial planets. The masses and orbits of Venus, Earth, Theia (which later collided with Earth to form the Moon), and Mars are all consistent with pebble accretion onto protoplanets that formed around Mars' orbit and migrated to their final positions while growing. The isotopic compositions of Earth and Mars are matched qualitatively by accretion of two generations of pebbles, carrying distinct isotopic signatures. Last, we show that the water and carbon budget of Earth can be delivered by pebbles from the early generation before the gas envelope became hot enough to vaporize volatiles.
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  • Johansen, Anders, et al. (author)
  • Adding particle collisions to the formation of asteroids and Kuiper belt objects via streaming instabilities
  • 2012
  • In: Astronomy & Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 537
  • Journal article (peer-reviewed)abstract
    • Modelling the formation of super-km-sized planetesimals by gravitational collapse of regions overdense in small particles requires numerical algorithms capable of handling simultaneously hydrodynamics, particle dynamics and particle collisions. While the initial phases of radial contraction are dictated by drag forces and gravity, particle collisions become gradually more significant as filaments contract beyond Roche density. Here we present a new numerical algorithm for treating momentum and energy exchange in collisions between numerical superparticles representing a high number of physical particles. We adopt a Monte Carlo approach where superparticle pairs in a grid cell collide statistically on the physical collision time-scale. Collisions occur by enlarging particles until they touch and solving for the collision outcome, accounting for energy dissipation in inelastic collisions. We demonstrate that superparticle collisions can be consistently implemented at a modest computational cost. In protoplanetary disc turbulence driven by the streaming instability, we argue that the relative Keplerian shear velocity should be subtracted during the collision calculation. If it is not subtracted, density inhomogeneities are too rapidly diffused away, as bloated particles exaggerate collision speeds. Local particle densities reach several thousand times the mid-plane gas density. We find efficient formation of gravitationally bound clumps, with a range of masses corresponding to contracted radii from 100 to 400 km when applied to the asteroid belt and 150 to 730 km when applied to the Kuiper belt, extrapolated using a constant self-gravity parameter. The smaller planetesimals are not observed at low resolution, but the masses of the largest planetesimals are relatively independent of resolution and treatment of collisions.
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  • Result 1-10 of 5987
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journal article (3374)
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peer-reviewed (4059)
other academic/artistic (1707)
pop. science, debate, etc. (218)
Author/Editor
Jareborg, Nils, (13)
Yang, Y. (12)
Sundén, Bengt (12)
Zetterberg, Henrik, ... (12)
Blennow, Kaj, 1958 (11)
Liu, Johan, 1960 (11)
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Bartek, J (11)
Haglund, Peter (11)
He, Sailing (11)
aut (10)
Eriksson, M (10)
Trygg, Johan (9)
Nolte, Thomas (9)
Fabian, Martin, 1960 (9)
Wang, Shu Min, 1963 (9)
Sun, Licheng (9)
Bogdan, Michael (9)
Ågren, Hans (8)
Zhu, J. (7)
Winblad, B (7)
Nilsson, L. (7)
Tegner, Yelverton (7)
Wang, Lihui (7)
Sun, Junliang (7)
Hagfeldt, Anders (7)
Marko-Varga, György (7)
Karim, Ramin (7)
Leisner, Peter (7)
Fogelström, Linda (7)
Hearn, Jeff, 1947- (6)
Aarsland, D (6)
Zhang, Y. (6)
KLARESKOG, L (6)
Zhu, Bin (6)
Nielsen, Jens B, 196 ... (6)
Ekselius, Lisa (6)
Stake, Jan, 1971 (6)
Melen, E (6)
van Hage, M (6)
Tjernström, Michael (6)
Rodilla, Helena, 198 ... (6)
Lichtenstein, P. (6)
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McKelvey, Tomas, 196 ... (6)
Drakinskiy, Vladimir ... (6)
Gao, Feng (6)
da Costa, Karen (6)
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Royal Institute of Technology (633)
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Linköping University (374)
Chalmers University of Technology (374)
Umeå University (297)
Luleå University of Technology (226)
Swedish University of Agricultural Sciences (142)
Linnaeus University (133)
Örebro University (130)
Mälardalen University (89)
RISE (89)
Jönköping University (80)
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Malmö University (54)
University of Gävle (51)
Södertörn University (47)
University of Borås (42)
Kristianstad University College (35)
Halmstad University (34)
VTI - The Swedish National Road and Transport Research Institute (34)
Högskolan Dalarna (30)
University West (28)
Swedish Environmental Protection Agency (28)
Blekinge Institute of Technology (28)
Swedish National Heritage Board (24)
Stockholm School of Economics (22)
University of Skövde (18)
Marie Cederschiöld högskola (16)
Swedish National Defence College (15)
IVL Swedish Environmental Research Institute (14)
The Swedish School of Sport and Health Sciences (11)
Royal College of Music (10)
Swedish Museum of Natural History (9)
Red Cross University College (9)
The Nordic Africa Institute (8)
The Institute for Language and Folklore (7)
University College of Arts, Crafts and Design (4)
University College Stockholm (2)
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Language
English (5914)
Swedish (60)
Norwegian (5)
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Chinese (3)
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Research subject (UKÄ/SCB)
Engineering and Technology (5985)
Natural sciences (1449)
Agricultural Sciences (72)
Medical and Health Sciences (64)
Humanities (49)
Social Sciences (34)

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