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| 2. |
- Gabrysch, Markus, et al.
(author)
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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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In: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 103:6
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Journal article (peer-reviewed)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.
(author)
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Magnetic anisotropies of Fe-n/V-m(001) superlattices determined by Ferromagnetic Resonance
- 1998
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In: IEEE TRANSACTIONS ON MAGNETICS. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0018-9464. ; 34:4, s. 873-875
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Journal article (other academic/artistic)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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| 6. |
- Elvstam, O., et al.
(author)
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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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In: HIV Medicine. - : Wiley. - 1464-2662 .- 1468-1293. ; 20:9, s. 571-580
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Journal article (peer-reviewed)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.
(author)
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Anisotropic behaviour of the magnetoresistance in single crystalline iron films
- 1999
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In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - : ELSEVIER SCIENCE BV. - 0304-8853. ; 195:1, s. 1-8
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Journal article (peer-reviewed)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.
(author)
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Antiferromagnetic coupling and giant magnetoresistance in Fe/V(0 0 1) superlattices
- 1998
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In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - : ELSEVIER SCIENCE BV. - 0304-8853. ; 186:1-2, s. 154-160
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Journal article (peer-reviewed)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.
(author)
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Magnetic and transport properties of epitaxial Fe/V(001) superlattice films
- 1996
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In: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. - 0163-1829. ; 54:2, s. 1199-1204
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Journal article (peer-reviewed)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.
(author)
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Structure and magnetic properties of Fe/V (110) superlattices
- 1998
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In: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMERICAN PHYSICAL SOC. - 0163-1829. ; 57:6, s. 3531-3538
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Journal article (peer-reviewed)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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| 11. |
- Anisimov, AN, et al.
(author)
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Orbital magnetism and magnetic anisotropy probed with ferromagnetic resonance
- 1999
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In: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 82:11, s. 2390-2393
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Journal article (other academic/artistic)abstract
- Via ferromagnetic resonance both the magnetic anisotropy energy (MAE) and the spectroscopic splitting tensor (g tensor) for a bcc Fe-2/V-5(001) superlattice are measured independently. The theoretically proposed proportionality between the anisotropy of t
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| 12. |
- Anisimov, AN, et al.
(author)
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The temperature-dependent in- and out-of-plane magnetic anisotropies in Fe-n/V-m(001) superlattices
- 1997
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In: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. - 0953-8984. ; 9:48, s. 10581-10593
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Journal article (other academic/artistic)abstract
- Fe-n/V-m(001) superlattices grown on MgO(001) are studied by ferromagnetic resonance (FMR). The temperature dependence of the second- and fourth-order in- and out-of-plane magnetic anisotropies were determined from azimuthal and polar angular-dependent FM
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| 13. |
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| 14. |
- Duda, LC, et al.
(author)
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Hydrogen-induced changes of the electronic states in ultrathin single-crystal vanadium layers
- 1997
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In: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. - 0163-1829. ; 55:19, s. 12914-12917
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Journal article (other academic/artistic)abstract
- The electronic structure of vanadium in an Fe/V (001) superlattice, exposed to a 100 torr hydrogen pressure, was investigated using soft-x-ray emission spectroscopy and first-principles band-structure calculations. We present x-ray emission spectra from t
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| 15. |
- Duda, LC, et al.
(author)
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Soft-x-ray emission study of Fe/V(001) superlattices
- 1996
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In: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. - 0163-1829. ; 54:15, s. 10393-10396
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Journal article (other academic/artistic)abstract
- We have studied the electronic structure of the interfaces in bet Fe/V (001) superlattices (SL's) grown on MgO(001) with soft-x-ray emission spectroscopy. Two samples with different thicknesses of Fe and V were investigated: [(V)(2)/(Fe)(5)](60) and [(V)(
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| 16. |
- Hjörvarsson, Björgvin, et al.
(author)
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Temperature dependence of the magnetic interlayer ordering in Fe(3)/V(14)Hx (001) superlattices
- 2008
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In: Superlattices and Microstructures. - : Elsevier BV. - 0749-6036 .- 1096-3677. ; 43:2, s. 101-111
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Journal article (peer-reviewed)abstract
- The magnetic interlayer ordering in Fe(3)/V (14)Hx (001) superlattices exhibits dramatic changes on changing the hydrogen concentration. From initial antiferromagnetic (AF) coupling with , the introduction of H (H/V atomic ratio of 0.06) gives rise to ferromagnetic (FM) alignment at room temperature. When cooled, the magnetic ordering exhibits a transition from FM to a canted state below 200 K. Further increase of the hydrogen content (H/V ≈1) gives rise to FM-ordering at temperatures between 30 and 300 K.
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| 17. |
- Le Guillou, Y, et al.
(author)
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Highly integrated direct conversion receiver for GSM/GPRS/EDGE with on-chip 84-dB dynamic range continuous-time ΣΔ ADC
- 2005
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In: IEEE Journal of Solid-State Circuits. - 0018-9200. ; 40:2, s. 403-411
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Journal article (peer-reviewed)abstract
- This paper describes a highly digitized direct conversion receiver of a single-chip quadruple-band RF transceiver that meets GSM/GPRS and EDGE requirements. The chip uses an advanced 0.25-mum BiCMOS technology. The I and Q on-chip fifth-order single-bit continuous-time sigma-delta (SigmaDelta) ADC has 84-dB dynamic range over a total bandwidth of +/-135 kHz for an active area of 0.4 mm(2). Hence, most of the channel filtering is realized in a CMOS IC where digital processing-is achieved at a lower cost. The systematic analysis of dc offset at each stage of the design enables to perform the dc offset cancellation loop in the digital domain as well. The receiver operates at 2.7 V with a current consumption of 75 mA. A first-order substrate coupling analysis enables to optimize the floor plan strategy. As a result, the receiver has an area of 1.8 mm(2).
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| 18. |
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| 19. |
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| 20. |
- Poulopoulos, P, et al.
(author)
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Magnetic anisotropy and exchange coupling in FenVm(001) superlattices on MgO(001)
- 1997
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In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - : ELSEVIER SCIENCE BV. - 0304-8853. ; 170:1-2, s. 57-66
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Journal article (other academic/artistic)abstract
- Fe(0 0 1) single layers and FenVm(0 0 1) superlattices were epitaxially grown on MgO(0 0 1) substrates, where n and m denote the number of monolayers (ML) of the constituents within each modulation period. n and tn were varied between 3 and 14 ML. Structu
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| 21. |
- Skytt, P, et al.
(author)
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Probe depth variation in grazing exit soft-X-ray emission spectroscopy
- 1997
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In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT. - 0168-9002. ; 384:2-3, s. 558-562
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Journal article (other academic/artistic)abstract
- The angular dependence of soft X-ray emission spectra from a sandwich structured sample has been studied. Greatly enhanced surface sensitivity is observed at grazing emission. Soft X-ray emission allows chemical state information to be obtained owing to h
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| 22. |
- Agren, B, et al.
(author)
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MR imaging of multiple myeloma patients with bone-marrow transplants
- 1998
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In: Acta radiologica (Stockholm, Sweden : 1987). - : SAGE Publications. - 0284-1851 .- 1600-0455. ; 39:1, s. 36-42
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Journal article (peer-reviewed)abstract
- Purpose: to evaluate the role of MR imaging in the examination of multiple myeloma (MM) patients with bone-marrow transplants Material and Methods: A total of 40 MR examinations were made of 20 patients: 33 examinations of the spine and pelvis in 20/20 patients; and 7 examinations of the femora in 5/20 patients. the 40 examinations were evaluated and the results compared with those found at radiography. Altogether 13/20 patients were re-examined: 10 after 1 year (1 patient twice); and 3 after 2 years. Five sequences were tested, 3 of them first without and then with i.v. contrast enhancement Results: in 24/33 examinations, active MM lesions were shown by MR. in 16/33 examinations, MR showed greater spread and detectability than radiography. in the 5/20 femoral patients, 3 had a peripheral red bone-marrow extension in the femora. in the 13 re-examinations, the lesions had spread in 4 patients, were unchanged in 7, and had decreased in 2. the lesions were easier to detect with the turbo inversion recovery (TIR) technique and with fat saturation than with the conventional spin-echo sequences. Contrast enhancement made the lesions more conspicuous in 8/17 examinations Conclusion: MR has the potential to be a useful routine examination with T1-weighted and TIR sequences of selected areas, and without the use of contrast enhancement. However, further longitudinal studies are necessary in order to evaluate its possible predictive value
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