| 1. |
- Aad, G., et al.
(author)
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- 2012
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swepub:Mat__t (peer-reviewed)
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| 2. |
- Aad, G., et al.
(author)
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- 2012
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swepub:Mat__t (peer-reviewed)
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| 3. |
- Aad, G., et al.
(author)
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- 2015
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In: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :4
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Journal article (peer-reviewed)
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| 4. |
- Aad, G., et al.
(author)
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- 2011
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swepub:Mat__t (peer-reviewed)
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| 5. |
- Lind, K, et al.
(author)
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Departures from LTE for neutral Li in late-type stars
- 2009
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 503:2, s. 541-544
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Journal article (peer-reviewed)abstract
- We perform non-LTE calculations of lithium in late-type stars for a wide range of stellar parameters, including quantum mechanical cross-sections for collisions with neutral hydrogen and the negative hydrogen ion. Non-LTE abundance corrections for the lithium resonance line at 670.7 nm and the subordinate line at 610.3 nm, are calculated using 1D MARCS model atmospheres spanning a grid T-eff = [4000, 8000] K, log g = [1.0, 5.0], and [Fe/H] = [0.0, -3.0], for lithium abundances in the range A(Li) = [-0.3, 4.2]. The competing effects of ultraviolet over-ionization and photon losses in the resonance line govern the behaviour of the non-LTE effects with stellar parameters and lithium abundance. The size and sign of the non-LTE abundance corrections vary significantly over the grid for the 670.7 nm line, but are typically positive and below 0.15 dex for the 610.3 nm, line. The new collisional data play a significant role in determining the abundance corrections.
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| 6. |
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- 2011
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swepub:Mat__t (peer-reviewed)
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| 7. |
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| 8. |
- Rodriguez Hortal, Cecilia
(author)
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Non invasive ventilation in people with cystic fibrosis
- 2016
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Doctoral thesis (other academic/artistic)abstract
- Background: Cystic fibrosis (CF) is the most common life shortening autosomal recessive inherited disease affecting Caucasian people. The two main clinical characteristics of CF are progressive pulmonary disease and pancreatic insufficiency. The goal of airway clearance technique (ACT) is to improve ventilation and mucociliary clearance. The overall purpose of this thesis was to evaluate and compare the effects of Non Invasive Ventilation (NIV) and positive expiratory pressure (PEP) on airway clearance, and to find out if the use of NIV during an exercise test would reduce carbon dioxide (CO2) retention compared to oxygen (O2) supplementation. To explore at what point after ACT spirometry should be performed, and to determine whether there are interindividual and intraindividual differences, were also studied. To describe the patients ́experiences of using NIV as an adjunct to ACT was also a purpose. Paper I, a prospective study. Twenty-four patients with CF. In adult patients, mean forced expiratory volume in one second (FEV1) improved 30 min (p=0.001), 1 h (p=0.002), and 2 h (p=0.006) after physiotherapy compared to baseline; in pediatrics it improved after the session (n.s.). There were no intraindividual variations but interindividual differences were found. Paper II, a prospective randomized study. Thirty-two patients with CF completed a 3 month long randomized trial comparing NIV with standard PEP. There was a significant reduction in lung clearance index (LCI) following NIV compared with PEP (p=0.01). Paper III, a qualitative study. Eighteen patients with CF were interviewed about their experiences using NIV during chest physiotherapy. Semi-structured interviews were conducted and analyzed using qualitative content analysis. “Becoming friends with NIV” emerged as a theme and came to represent a learning process. To facilitate this learning process, different factors should be taken into account until NIV is experienced as meningful. Paper IV, a prospective crossover study, compared O2 supplementation and NIV during an exercise test. Eight patients with CF completed an incremental test on a treadmill (using the Bruce protocol) while comparing standard treatment O2 with NIV. NIV showed a decreased rise in transcutaneous pressure of carbon dioxide (tcPCO2), maintaining the level within the normal reference values compared to O2 (p=0.01). Conclusion: The point at which to perform a lung function test after an ACT is different for adults and children. NIV has shown to be as effective as other ACTs. Exercise tests showed tcPCO2 remaining within the normal reference values with NIV but not with PEP. All participants completed the NIV treatment without major discomfort and experienced NIV as meaningful after becoming friendly with the NIV.
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| 9. |
- Feng, Yanyue, 1993, et al.
(author)
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Synthesis and Characterization of Catalytically Active Au Core─Pd Shell Nanoparticles Supported on Alumina
- 2022
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In: Langmuir. - : American Chemical Society (ACS). - 1520-5827 .- 0743-7463. ; 38:42, s. 12859-12870
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Journal article (peer-reviewed)abstract
- A two-step seeded-growth method was refined to synthesize Au@Pd core@shell nanoparticles with thin Pd shells, which were then deposited onto alumina to obtain a supported Au@Pd/Al2O3 catalyst active for prototypical CO oxidation. By the strict control of temperature and Pd/Au molar ratio and the use of l-ascorbic acid for making both Au cores and Pd shells, a 1.5 nm Pd layer is formed around the Au core, as evidenced by transmission electron microscopy and energy-dispersive spectroscopy. The core@shell structure and the Pd shell remain intact upon deposition onto alumina and after being used for CO oxidation, as revealed by additional X-ray diffraction and X-ray photoemission spectroscopy before and after the reaction. The Pd shell surface was characterized with in situ infrared (IR) spectroscopy using CO as a chemical probe during CO adsorption-desorption. The IR bands for CO ad-species on the Pd shell suggest that the shell exposes mostly low-index surfaces, likely Pd(111) as the majority facet. Generally, the IR bands are blue-shifted as compared to conventional Pd/alumina catalysts, which may be due to the different support materials for Pd, Au versus Al2O3, and/or less strain of the Pd shell. Frequencies obtained from density functional calculations suggest the latter to be significant. Further, the catalytic CO oxidation ignition-extinction processes were followed by in situ IR, which shows the common CO poisoning and kinetic behavior associated with competitive adsorption of CO and O2 that is typically observed for noble metal catalysts.
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| 10. |
- Simkins, Lauren M., et al.
(author)
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Advances in understanding subglacial meltwater drainage from past ice sheets
- 2022
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In: Annals of Glaciology. - 0260-3055 .- 1727-5644. ; 63:87-89, s. 83-87
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Journal article (peer-reviewed)abstract
- Meltwater drainage beneath ice sheets is a fundamental consideration for understanding ice–bed conditions and bed-modulated ice flow, with potential impacts on terminus behavior and ice-shelf mass balance. While contemporary observations reveal the presence of basal water movement in the subglacial environment and inferred styles of drainage, the geological record of former ice sheets, including sediments and landforms on land and the seafloor, aids in understanding the spatiotemporal evolution of efficient and inefficient drainage systems and their impact on ice-sheet behavior. We highlight the past decade of advances in geological studies that focus on providing process-based information on subglacial hydrology of ice sheets, how these studies inform theory, numerical models and contemporary observations, and address the needs for future research.
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