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| 2. |
- Gabrysch, Markus, et al.
(författare)
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Formation of secondary electron cascades in single-crystalline plasma-deposited diamond upon exposure to femtosecond x-ray pulses
- 2008
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 103:6
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Tidskriftsartikel (refereegranskat)abstract
- Secondary electron cascades were measured in high purity single-crystalline chemical vapor deposition (CVD) diamond, following exposure to ultrashort hard x-ray pulses (140 fs full width at half maximum, 8.9 keV energy) from the Sub-Picosecond Pulse Source at the Stanford Linear Accelerator Center. We report measurements of the pair creation energy and of drift mobility of carriers in two CVD diamond crystals. This was done for the first time using femtosecond x-ray excitation. Values for the average pair creation energy were found to be 12.17 +/- 0.57 and 11.81 +/- 0.59 eV for the two crystals, respectively. These values are in good agreement with recent theoretical predictions. The average drift mobility of carriers, obtained by the best fit to device simulations, was mu(h)= 2750 cm(2)/V s for holes and was mu(e)= 2760 cm(2) / V s for electrons. These mobility values represent lower bounds for charge mobilities due to possible polarization of the samples. The results demonstrate outstanding electric properties and the enormous potential of diamond in ultrafast x-ray detectors.
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| 3. |
- Anisimov, AN, et al.
(författare)
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Magnetic anisotropies of Fe-n/V-m(001) superlattices determined by Ferromagnetic Resonance
- 1998
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Ingår i: IEEE TRANSACTIONS ON MAGNETICS. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0018-9464. ; 34:4, s. 873-875
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The temperature-dependent magnetic anisotropies of Fe-n/V-m(001) superlattices on MgO(001) were determined by Ferromagnetic Resonance (FMR). The re-layer thickness n ranges between 2 and 4 atomic layers. The shape anisotropy dominates, and the easy-axis o
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| 4. |
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| 5. |
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| 6. |
- Elvstam, O., et al.
(författare)
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Is low-level HIV-1 viraemia associated with elevated levels of markers of immune activation, coagulation and cardiovascular disease?
- 2019
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Ingår i: HIV Medicine. - : Wiley. - 1464-2662 .- 1468-1293. ; 20:9, s. 571-580
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: The clinical significance of low-level viraemia (LLV) during antiretroviral therapy (ART) is debated. We retrospectively investigated longitudinal levels of plasma markers associated with inflammation, altered coagulation and cardiovascular disease in Swedish HIV-positive adults in relation to LLV or permanent virological suppression during long-term ART. Methods: Plasma levels of C-reactive protein (CRP), D-dimer, vascular cell adhesion molecule 1 (VCAM-1), suppression of tumorigenicity 2 (ST2), growth differentiation factor 15 (GDF-15), soluble CD14 (sCD14), soluble CD163 (sCD163), interferon-γ-induced protein 10 (IP-10) and β-2-microglobulin were measured in 34 individuals with LLV (viral load 50–999 HIV-1 RNA copies/mL) and in matched controls with persistent virological suppression. Biomarker levels were analysed in samples obtained during episodes of LLV and follow-up samples obtained 1year later (with similar timing for controls). All biomarkers were analysed using an independent sample t-test and analysis of covariance (ANCOVA) after logarithmic transformation. Log-rank analysis was applied for markers with concentration values out of range. Results: Compared with controls, patients with LLV had significantly higher levels of GDF-15 [geometric mean 3416 (95% confidence interval (CI) 804–14516) pg/mL versus 2002 (95% CI 355–11295) pg/mL in controls; P=0.026] and D-dimer [mean 1114 (95% CI 125–9917) ng/mL versus 756 (95% CI 157–3626) ng/mL; P=0.038] after adjustment for age, CD4 count nadir and type of ART. In the unadjusted t-test, only GDF-15 was significantly higher and in the log-rank test, both GDF-15 and D-dimer were significantly elevated. No significant differences were observed for the other biomarkers analysed. Conclusions: Although levels of inflammation markers were similar in ART recipients with and without LLV, persons with LLV had significantly higher levels of GDF-15 and D-dimer. These findings suggest a potential link between LLV and cardiovascular outcomes. © 2019 British HIV Association
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| 7. |
- Granberg, P, et al.
(författare)
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Anisotropic behaviour of the magnetoresistance in single crystalline iron films
- 1999
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Ingår i: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - : ELSEVIER SCIENCE BV. - 0304-8853. ; 195:1, s. 1-8
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Tidskriftsartikel (refereegranskat)abstract
- Magnetoresistive properties of single crystalline Fe(0 0 1) films with thickness in the range 5-100 nm are reported. The films possess low coercive fields (similar to 100 A/m) but a weak irreversible behaviour of the magnetization remains to fields of the
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| 8. |
- Granberg, P, et al.
(författare)
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Antiferromagnetic coupling and giant magnetoresistance in Fe/V(0 0 1) superlattices
- 1998
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Ingår i: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - : ELSEVIER SCIENCE BV. - 0304-8853. ; 186:1-2, s. 154-160
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Tidskriftsartikel (refereegranskat)abstract
- Structural and magnetic properties of Fe/V(0 0 1) superlattices consisting of 3 monolayers Fe separated by V interlayers of thickness in the range 8-17 monolayers have been investigated. RHEED and X-ray diffraction investigations show that the samples are
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| 9. |
- Granberg, P, et al.
(författare)
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Magnetic and transport properties of epitaxial Fe/V(001) superlattice films
- 1996
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Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. - 0163-1829. ; 54:2, s. 1199-1204
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Tidskriftsartikel (refereegranskat)abstract
- Single-crystalline Fe(15 ML)/V (1-12 ML) superlattices, epitaxially grown in the (001) direction, have been investigated using magnetization and electrical transport measurements. For all V thicknesses the system exhibits ferromagnetic properties. Results
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| 10. |
- Isberg, P, et al.
(författare)
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Structure and magnetic properties of Fe/V (110) superlattices
- 1998
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Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMERICAN PHYSICAL SOC. - 0163-1829. ; 57:6, s. 3531-3538
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Tidskriftsartikel (refereegranskat)abstract
- Structural, magnetic, and magnetotransport properties of Fe/V (110) superlattices have been investigated. Using Al2O3 (<10(2)over bar 0>) substrates and Mo or MoxV1-x allay seed layers, the superlattices could be grown with a large in- and out-of-plane cr
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