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  • 1. ANDERSSON, CBM
    et al.
    OLSSON, LO
    HAKANSSON, MC
    ILVER, L
    KARLSSON, Ulf O
    KTH, School of Information and Communication Technology (ICT).
    KANSKI, J
    CORE-LEVEL PHOTOEMISSION FROM (III)-TYPE INAS SURFACES1994In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 4, no C9, p. 209-212Article in journal (Refereed)
    Abstract [en]

    The InAs(111)2x2 and InAs(($$$) over bar 111)1x1 surfaces have been studied with high resolution core level spectroscopy. For the InAs(($$$) over bar 111)1x1 surface both the In 4d and the As 3d core levels display strong surface core level shifts, while for the InAs(111)2x2 surface only the In 4d level shows a detectable surface shift. The results indicate that the InAs(($$$) over bar 111)1x1 surface is relaxed, with atom layer displacement extending to subsurface layers. Unexpectedly, we find no surface shifted anion core level for the InAs(111)2x2 surface.

  • 2.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Stalmans, Rudy
    Ågren, John
    KTH, Superseded Departments, Materials Science and Engineering.
    The Influence of External Stresses on the Transformation Behaviour in a Fe-Mn-Si Alloy1997In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 7, no C5, p. 411-416Article in journal (Refereed)
    Abstract [en]

    The influence of external stresses on the transformation behaviour has been studied for a polycrystalline Fe-3 IMn-SSi alloy exhibiting the y-+& martensitic transformation. Samples have been loaded at temperatures above the M, temperature, cooled with a constant external load to a temperature below the M, temperature and subsequently heated without load to a temperature above the A, temperature of the alloy. Stress, strain and temperature have been continuously measured and transformation temperatures and strains have been determined from the change in strain during the transformation. It has been found that the M, temperature during cooling with load is not influenced by 0.3-2 % plastic pre-deformation of the austenite whereas there is a substantial increase in the transformation strain, i.e. variants with a favourable orientation are enhanced by pre-strain of austenite.

  • 3.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Ågren, John
    KTH, Superseded Departments, Materials Science and Engineering.
    Effect of Prestraining and Training on the γ→ε Transformation in Fe-Mn-Si Alloys1995In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 5, no C8, p. 457-462Article in journal (Refereed)
    Abstract [en]

    The effect of training and predeformation on the martensitic transformation is investigated. It is concluded that MS as a function of predeformation strain must have a maximum at around 3% strain. Prestrains less than 5% will enhance the martensitic transformation whereas larger prestrains depress it due to strain hardening of the γ phase.

  • 4. Astrath, N. G. C.
    et al.
    Bento, A. C.
    Baesso, M. L.
    da Silva, A. F.
    Ahuja, R.
    Persson, Clas
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Zhao, S.
    Granqvist, C. G.
    Thermal lens and photoacoustic spectroscopy to determine the thermo-optical properties of semiconductors2005In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 125, p. 181-183Article in journal (Refereed)
    Abstract [en]

    In this work we used photoacoustic and thermal lens spectroscopy to study four different semiconductor samples: PbI2, 4HSiC, NiCrO and NiO. The results showed that the combination of these two techniques provided the values of the band gap energies and the thermal diffusivities.

  • 5.
    Bhattacharya, Prosun
    et al.
    KTH, Superseded Departments, Land and Water Resources Engineering.
    Tandukar, N.
    Neku, A.
    Valero, A. A.
    Mukherjee, A. B.
    Jacks, G.
    Geogenic arsenic in groundwaters from Terai Alluvial Plain of Nepal2003In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 107, p. 173-176Article in journal (Refereed)
    Abstract [en]

    The origin and mobility of arsenic (As) in the groundwater environment has received serious attention in recent years. Recent studies have reported naturally occurring As in groundwaters of the Terai Alluvial Plains (TAP) in southern Nepal, where groundwater exploitation has increased since the 1960s. The source of As in TAP is geogenic and leached primarily due to weathering of As bearing rocks and sediments in the Himalayas. In our present study, we have investigated the groundwater chemistry in the central part of the TAP in Nawalparasi district. TAP groundwaters are near-neutral to alkaline, with predominantly reducing character and high HCO3-, low SO4- and NO3- concentrations. Elevated HCO3 levels possibly result due to the oxidation of organic matter, low SO42- levels reflect sulfate reduction. Elevated NH4+ concentrations in these groundwaters suggest dissimilatory nitrate reduction in the aquifers. Total arsenic (As,.,) levels in groundwater varied from 1.7 mug/L to as high as 404 mug/L with dominance of As(III) species and elevated levels of dissolved Fe and Mn. Arsenic is mobilized in groundwaters as a result of desorption of As-oxyanions adsorbed onto Fe- and Mn-oxides as well as reductive dissolution of these surface reactive phases from the sediments along with release of As in anoxic groundwaters.

  • 6. da Silva, A. F.
    et al.
    Persson, Clas
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Electronic properties of intrinsic and heavily doped AlN and GaN2006In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 132, p. 105-110Article in journal (Refereed)
    Abstract [en]

    We present a theoretical study of the electronic structure, optical properties, and the effective masses of AlN and GaN based on the local density approximation (LDA) within the density functional theory (DFT), employing the first-principles, full-potential linearized augmented plane wave method. We also describe the effects on the electronic properties of the semiconductors due to heavily n- and p-type doping. The critical concentration N-c for the doping-induced metal-nonmetal (MNM) transition in both n- and p-type is calculated.

  • 7. de Groot, J.
    et al.
    Johansson, G. A.
    Hemberg, O.
    Hertz, Hans M.
    KTH, Superseded Departments, Physics.
    Improved liquid-jet laser-plasma source for X-ray microscopy2003In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 104, p. 121-122Article in journal (Refereed)
    Abstract [en]

    We increase the x-ray flux from a liquid-jet laser-plasma x-ray source by optimizing the target geometry. A new nozzle fabrication method allows us to produce stable microscopic liquid jets with a wide range of diameters. The improved x-ray flux is demonstrated by optimizing the diameter of an ethanol liquid-jet for our 3 ns, square=532 nm Nd:YAG laser and measuring the flux at the square=3.37 rim C VI emission line. Preliminary data suggest that the x-ray flux can be increased by more than a factor of 4 compared to previous experiments. The goal is to significantly reduce the exposure time of our laser-plasma-based compact x-ray microscope by improving the source.

  • 8.
    Engdahl, Göran
    et al.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Bergqvist, A.
    Lundberg, A.
    Measurements and modelling of 2-D magntization and magnetoelasticity in silicon iron1998In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177Article in journal (Refereed)
  • 9. Fruke, R.
    et al.
    Wilhein, T.
    Wieland, M.
    Vogt, Ulrich
    Imaging of a laser plasma source at 13 nm wavelength approaching submicrometer resolution2003In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 104, p. 153-156Article in journal (Refereed)
    Abstract [en]

    Radiation in the extreme ultraviolet (EUV) spectral range is of interest for lithography and microscopy. Laser produced plasmas are sources for this kind of radiation. For successful usage it is necessary to study the source properties like size, stability and emitted spectra. For the spatial characterization of such a source a beamline was built up. The source was imaged at 13, 15 and 17 nm wavelength and at different laser energies with a resolution of better than 2 mum. As target material ethanol was used which was excited by a frequency-doubled Nd:YAG laser (lambda=532 nm; 3 ns, 30 Hz). The source was mapped with a zone plate (KZP5: d=2500 mum, Deltar(n)=0,523 mum). With a magnification of 61 the images were taken with a thinned back-illuminated CCD. Additionally a periodic structure was mapped with micrometer resolution, too.

  • 10.
    Grünfeld, Katrin
    KTH, Superseded Departments, Land and Water Resources Engineering.
    Interactive visualization applied to multivariate geochemical data: A case study2003In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 107, p. 577-580Article in journal (Refereed)
    Abstract [en]

    Geochemical survey data have commonly been analysed combining methods from several disciplines - statistics, geostatistics, geographic information technology, visualization. In initial stages of analysis, tables are often used to describe the data and present statistical measures. For too often the original data are manipulated in one or another way, for example, using mathematical transformations, or interpolation of points to a surface. It is the author's opinion that raw geochemical data should be used in initial stages of data description, thus preserving the original details. This is not a simple task, as geochemical data are commonly complex, multivariate, and collected on irregular grid. Data contain outliers, element contents vary within thousands of ppm (parts per million), and different chemical elements may be correlated. In the present study a graphical approach has been used to study distribution of 5 heavy metals in glacial till. Using interactive visualization and multiple linked views of the data, the following issues were addressed: multi-element outliers, spatial trends, multi-element correlations and patterns. Interactive graphical techniques proved to be especially suitable for studying outliers and identifying and locating samples that are redundant and may be removed from data without loss of information. Visualization using linked views gave valuable insights about metal correlations and spatial trends. As the development of appropriate tools for analysing multivariate spatial data are still in its early stages, visualization freeware seems to be a good alternative providing powerful, easy to use and intuitive techniques for exploratory data analysis.

  • 11.
    Hertz, Hans M.
    et al.
    KTH, Superseded Departments, Physics.
    Berglund, M.
    Hansson, B. A. M.
    Hemberg, O.
    Johansson, G. J.
    Liquid-jet laser-plasma X-ray sources for microscopy and lithography2001In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 11, no PR2, p. 389-396Article in journal (Refereed)
    Abstract [en]

    We review the development of compact laser-plasma soft x-ray sources based on microscopic liquid-drop or liquid-jet targets. It is shown that such sources provide practically debris-free, high-flux operation at water-window and EUV wavelengths. This regenerative and solid-density target system holds promise for the generation of high-average power using high-repetition-rate lasers. Application of the source to compact x-ray microscopy, multi layer-op tics characterization and EUV lithography is briefly discussed.

  • 12.
    Hertz, Hans M.
    et al.
    KTH, Superseded Departments, Physics.
    Johansson, G. A.
    Stollberg, H.
    de Groot, J.
    Hemberg, O.
    Holmberg, Anders
    Rehbein, S.
    Jansson, P.
    Eriksson, F.
    Birch, J.
    Table-top X-ray microscopy: Sources, optics and applications2003In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 104, p. 115-119Article in journal (Refereed)
    Abstract [en]

    We have developed the first operative compact sub-visible-resolution x-ray microscope for the water-window region (lambda = 2.3 - 4.4 nm). The microscope is based on a 100 Hz liquid-jet-target laser-plasma x-ray source, normal-incidence multilayer condenser optics, diffractive zone plate optics and CCD detection. In the present article we emphasize the system's aspects and summarize the recent progress on the components, all aiming at the reduction of the exposure time of a few seconds, i.e., similar to bending-magnet based microscopes. This primarily includes improved laser-plasma source, improved condenser optics using Cr/Sc multilayers, and improved image handling capability using wavelet algorithms. Such compact short-exposure time microscopes would significantly increase the applicability of the technology.

  • 13. Lundgren, Anders
    et al.
    Engdahl, Göran
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Measurements and modelling of magnetostrictive strain of a transversely excited silicon iron sheet1998In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 8, p. 587-590Article in journal (Refereed)
  • 14. Symonds, C
    et al.
    Sagnes, I
    Oudar, J L
    Bouchoule, S
    Strassner, Martin
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Continuous optical pumping laser activity of a VCSEL at room temperature in an external cavity at 1.55 Im2004In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 119, p. 279-280Article in journal (Refereed)
  • 15. Tomas, S. A.
    et al.
    Stolik, S.
    Palomino, R.
    Lozada, R.
    Persson, Clas
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Ahuja, R.
    Pepe, I.
    da Siva, A. F.
    Optical properties of rhodamine 6G-doped TiO2 sol-gel films2005In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 125, p. 415-417Article in journal (Refereed)
    Abstract [en]

    The optical properties of titania (TiO2) thin films prepared by the sol-gel process and doped with rhodamine 6G were studied by Photoacoustic Spectroscopy. Rhodamine 6G-doping was achieved by adding 0.01%, 0.02%, 0.05% y 0.1% mol rhodamine to a solution that contained titanium isopropoxide as precursor. Two absorption regions were distinguished in the absorption spectrum of a typical rhodamine 6G-doped TiO2 film. A shift of these bands occured as a function of rhodamine 6G-doping concentration. In addition, the optical absorption and band gap energy for rutile-phase TiO2 films were calculated employing the full-potential linearized augmented plane wave method. A comparison of these calculations with experimental data of TiO2 films prepared by sol-gel at room temperature was performed.

  • 16. Zheng-Johansson, J. X.
    et al.
    Johansson, Börje
    The peaked structure of phonon density of states of a confined superfluid - a theoretical prediction, and discussions regarding its experimental probe2000In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 10, no P7, p. 181-184Article in journal (Refereed)
1 - 16 of 16
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