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Ab initio calculations of 14N and 15N hyperfine structures
Jönsson, Per; Carette, Thomas; Nemouchi, Messaoud; Godefroid, Michel Journal article in Journal of Physics B: Atomic, Molecular and Optical Physics;11 (2010)	peer-reviewed scientific ARTICLE

English abstract:	Hyperfine structure parameters are calculated for the 2p2(3P)3s 4PJ, 2p2(3P)3p 4Po J and 2p2(3P)3p 4Do J levels, using the ab initio multiconfiguration Hartree–Fock method. The theoretical hyperfine coupling constants are in complete disagreement with the experimental values of Jennerich et al deduced from the analysis of the near-infrared Doppler-free saturated absorption spectra.

a_88.pdf (128.8Kb)

Aging response of spray-formed Inconel 718 between 620C and 1000C
Wei, Liu-Ying; Warren, Richard; Azadian, Saied Journal article in Journal of materials Science and technology : Journal of materials Science and technology (2005)	peer-reviewed scientific ARTICLE

Analysis of ferromagnetic archiving media ageing by time of flight-en...
Whitlow, Harry J; Zhang, Y; Winzell, T Journal article in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms (2000)	peer-reviewed scientific ARTICLE

English abstract:

Time of flight-energy elastic recoil detection analysis (ToF-E ERDA) has been applied to study the ageing of commercial thin film hard discs. Samples from a standard commercial removable hard disc were subjected to accelerated ageing heat treatment in normal humidity from 90°C up to 240°C in steps of 30°C for 3 h each. A test using a high humidity environment at 90°C up to 40 h was also performed. The ToF-E ERDA was carried out using a 60 MeV 127I11+ ion beam incident at 67.5° to the surface normal, and detecting recoils at 45° to the ion beam direction by measuring their time of flight and energy in a detector telescope. The magnetic thin film structure was assigned to be a CNx/Co/N-Cr/Ni-P multilayer. At temperatures higher than 180°C the CNx coating layer detoriated with an increase of surface oxygen and an N content reduction in the N-Cr layer.

Annealing of Low Resistivity Co-silicides formed by MEVVA Implantatio...
Zhang, Y; Lu, D-T; Zhang, T; Maximov, I A; Sarwe, E-L; Graczyk, M; Whitlow, Harry J Journal article in Nucl. Instrm. Meth INT75-177 (2001)	peer-reviewed scientific ARTICLE

Annual changes in MODIS vegetation indices of Swedish coniferous fore...
Jönsson, Anna Maria; Eklundh, Lars; Hellström, Margareta; Bärring, Lars; Jönsson, Per Journal article in Remote Sensing of the Environment;11 : Elsevier (2010)	peer-reviewed scientific ARTICLE

English abstract:

Remote sensing provides spatially and temporally continuous measures of forest reflectance, and vegetation indices calculated from satellite data can be useful for monitoring climate change impacts on forest tree phenology. Monitoring of evergreen coniferous forest is more difficult than monitoring of deciduous forest, as the new buds only account for a small proportion of the green biomass, and the shoot elongation process is relatively slow. In this study, we have analyzed data from 186 coniferous monitoring sites in Sweden covering boreal, southern-boreal, and boreo-nemoral conditions. Our objective was to examine the possibility to track seasonal changes in coniferous forests by time-series of MODIS eight-day vegetation indices, testing the coherence between satellite monitored vegetation indices (VI) and temperature dependent phenology. The relationships between two vegetation indices (NDVI and WDRVI) and four phenological indicators (length of snow season, modeled onset of vegetation period, tree cold hardiness level and timing of budburst) were analyzed. The annual curves produced by two curve fitting methods for smoothening of seasonal changes in NDVI and WDRVI were to a large extent characterized by the occurrence of snow, producing stable seasonal oscillations in the northern part and irregular curves with less pronounced annual amplitude in the southern part of the country. Measures based on threshold values of the VI-curves, commonly used for determining the timing of different phenological phases, were not applicable for Swedish coniferous forests. Evergreen vegetation does not have a sharp increase in greenness during spring, and the melting of snow can influence the vegetation indices at the timing of budburst in boreal forests. However, the interannual variation in VI-values for specific eight-day periods was correlated with the phenological indicators. This relation can be used for satellite monitoring of potential climate change impacts on northern coniferous spring phenology.

An effective method for calculation of diffusive flow in spherical gr...
Massih, Ali R; Hermansson, P. Journal article in Journal of Nuclear Materials;2-3 (2002)	peer-reviewed scientific ARTICLE

An improved method for detecting and delineating genomic regions with...
Nilsson, Björn; Johansson, M; Heyden, Anders; Melander, S; Fioretos, Thoas Journal article in Genome Biology;13 : BioMed Central (2008)	peer-reviewed scientific ARTICLE

English abstract:

Genomic regions with altered gene expression are a characteristic feature of cancer cells. We present a novel method for identifying such regions in gene expression maps. This method is based on total variation (TV) minimization, a classical signal restoration technique. In systematic evaluations, we show that our method combines top-notch detection performance with an ability to delineate relevant regions without excessive over-segmentation, making it a signi¯cant advance over existing methods. Software { Rendersome { is provided.

An Inverse Problem for Trapping Point Resonances
Iantchenko, Alexei Journal article in Letters in Mathematical Physics;2-3 : Springer (2008)	peer-reviewed scientific ARTICLE

English abstract:

We consider semi-classical Schr¨odinger operator P(h)=−h2+V (x) in Rn such that the analytic potential V has a non-degenerate critical point x0 = 0 with critical value E0 and we can define resonances in some fixed neighborhood of E0 when h > 0 is small enough. If the eigenvalues of the Hessian are Z-independent the resonances in hδ-neighborhood of E0 (δ>0) can be calculated explicitly as the eigenvalues of the semiclassical Birkhoff normal form. Assuming that potential is symmetric with respect to reflections about the coordinate axes we show that the classical Birkhoff normal form determines the Taylor series of the potential at x0. As a consequence, the resonances in a hδ-neighborhood of E0 determine the first N terms in the Taylor series of V at x0. The proof uses the recent inverse spectral results of V. Guillemin and A. Uribe.

trapping_point_arxiv.pdf (162.4Kb)

Application of variational inequalities to the moving-boundary proble...
Overgaard, Niels (2006) Submitted to Nonlinear Analysis: Theory, Methods & Applications	REPORT

English abstract:	We consider a moving-boundary problem associated with a limiting case of the fluid model for biofilm growth proposed by J. Dockery and I. Klapper, SIAM J. Appl. Math. 62(3), 2001. Concepts of classical, weak, and variational solutions for this problem are introduced. Classical solutions with radial symmetry are constructed, and estimates for their growth are given. Using a weighted Baiocchi transform it is shown that every classical solution is a weak solution. Every weak solution is in turn equivalent to the solution-set of a family of variational inequalities for an elliptic PDE (the variational solution). This allow us to show that, given arbitrary initial data at time t = 0 (any bounded open set), there exists a weak solution defined for all times t > 0. Upper bounds for the weak solutions are given, and a semi-group property is proved. The background for this problem, and a model derivation is also presented.
Swedish abstract:	Vi betraktar et problem med rörlig rand motsvarande ett gränsfall i en fluid modell för biofilmstillväxt som föreslagits av J. Dockery och I. Klapper SIAM J. Appl. Math. 62(3), 2001.

sDK-4.pdf (448.5Kb)

Application Specific Integrated Circuit (ASIC) Readout Technologies f...
Whitlow, Harry J Journal article in Nuclear instruments & methods in physics research Section B (2000)	peer-reviewed scientific ARTICLE

English abstract:

New possibilities for ion beam analysis (IBA) are afforded by recent developments in detector technology which facilitate the parallel collection of data from a large number of channels. Application specific integrated circuit (ASIC) technologies, which have been widely employed for multi-channel readout systems in nuclear and particle physics, are more net-cost effective (160 /channel for 1000 channels) and a more rational solution for readout of a large number of channels than afforded by conventional electronics. Based on results from existing and on-going chip designs, the possibilities and issues of ASIC readout technology are considered from the IBA viewpoint. Consideration is given to readout chip architecture and how the stringent resolution, linearity and stability requirements for IBA may be met. In addition the implications of the restrictions imposed by ASIC technology are discussed.

Approximating a Shortest Watchman Route
Nilsson, Bengt J. Journal article in Fundamenta Informaticae;3 : IOS Press (2001)	peer-reviewed scientific ARTICLE

English abstract:	We present a fast algorithm for computing a watchman route in a simple polygon that is at most a constant factor longer than the shortest watchman route. The algorithm runs in $O(n\log n)$ time as compared to the best known algorithm that computes a shortest watchman route which runs in $O(n^6)$ time.

Approximation Results for Kinetic Variants of TSP
Hammar, Mikael; Nilsson, Bengt J Journal article in Discrete and Computational Geometry;4 : Springer Verlag (2002)	peer-reviewed scientific ARTICLE

English abstract:

We study the approximation complexity of certain kinetic variants of the Traveling Salesman Problem where we consider instances where points move with fixed constant velocity in a fixed direction. We prove the following results: 1. If the points all move with the same velocity and in the same direction, then there is a PTAS for the Kinetic TSP. 2. The Kinetic TSP cannot be approximated better than by a factor of two by a polynomial time algorithm unless P=NP, even if there are only two moving points in the instance. \item The Kinetic TSP cannot be approximated better than by a factor of $2^{\Omega(\sqrt{n})}$ by a polynomial time algorithm unless P=NP, where $n$ is the size of the input instance, even if the maximum velocity is bounded.

kineticTSP.pdf (286.3Kb)

Are MCDF calculations 101 % correct in the superheavy elements range?
Indelicato, Paul; Bieron, Jacek; Jönsson, Per Journal article in Theoretical Chemistry Accounts: Theory, Computation, and Modeling;3-5 : Springer (2011)	peer-reviewed scientific ARTICLE

English abstract:

We explore QED and many-body effects in super-heavy elements up to Z = 173 using the multicon- ﬁguration Dirac–Fock method. We study the effect of going beyond the average level approximation on the determination of the ground state of element 140 and compare with the recent work of Pekka Pyykko¨ on the periodic table for super-heavy elements (Pyykko¨, in Phys Chem Chem Phys, 13:161, 2011). We conﬁrm that QED corrections are of the order of 1% on ionization energies. We show that the atomic number at which the 1s shell dives into the negative energy continuum is 173 and is not affected by the approximation employed to evaluate the electron–electron interaction.

superheavy.pdf (302.7Kb)

Att skapa framtiden – styrningsdilemman inom svensk IT-politik
Hall, Patrik; Löfgren, Karl; Stoltz, Pauline Journal article in Nordisk Administrativt Tidsskrift;4 (2002)	scientific ARTICLE

Swedish abstract:

Hvilke nye og gamle typer af spørgsmål har svenske politikkere defineret i forhold til den nye informationsteknologi? Kræver nye typer af sammenlignelige problemer og løsninger nye institutionelle former for politisk styring og styringsmidler? I artiklen beskrives den grundlæggende diskurs som denne fremtidsstyring formuleres indenfor. Desuden følger en kortlægning af, hvordan denne diskurs har resulteret i nye institutionelle former for politisk styring og i hvilke "netværk" den har kommet til at spille en stor rolle. Artiklen viser, at diskursen om IT har haft en konkret betydning for organisering af policyområdet IT. Med en mere traditionel måde at se på styring kan man samtidig spørge om denne organisering har været særlig effektiv.

Autonoma krafter och beroende människor: diskursiv makt inom svensk
Hall, Patrik Journal article in Statsvetenskaplig Tidskrift;2 (2004)	peer-reviewed scientific ARTICLE

A Combined SIF and Temperature Model of Delayed Hydride Cracking in Z...
Singh, R.N.; Shmakov, A.A.; Yan, D.; Eadie, R.L.; Matvienko, Yu.G. Journal article in Journal of Nuclear Materials;359 (2006)	peer-reviewed scientific ARTICLE

A Compact Ultra-High Vacuum (UHV) Compatible Instrument for Time-of-f...
Kuznetsov, A V; van Veldhuizen, E J; Westerberg, L; Lyapin, V G; Alekkelt, K; Loveland, W; Bondorf, J P; Jakobsson, B; Whitlow, Harry J; El Bouanani, M Journal article in Nuclear instruments & methods in physics research. Section A;3 (2000)	peer-reviewed scientific ARTICLE

English abstract:

A compact Ultra-High Vacuum (UHV) compatible instrument for time of flight-energy measurements of slow heavy reaction products from nuclear reactions has been designed and tested at the CELSIUS storage ring in Uppsala. The construction is based on MicroChannel Plate (MCP) time detectors of the electron mirror type and silicon p-i-n diodes, and permits the detectors to be stacked side-by-side to achieve large solid angle coverage. This kind of telescope measures the Time of Flight (ToF) and Energy (E) of the particle from which one can reconstruct mass. The combination of an ultra-thin cluster gas-jet target and thin carbon emitter foils allows one to measure heavy residues down to an energy of ~35 keV/nucleon from the interactions of 400 MeV/nucleon 16O with natXe gas targets.

A crack perpendicular to and terminating at the bimaterial interface ...
Chen, S. H.; Wang, T. C.; Kao-Walter, S. Journal article in Acta Mechanica Sinica;1 (2005)	peer-reviewed scientific ARTICLE

A Crack Perpendicular to a Bimaterial Interface in a Finite Solid
Chen, S. H.; Wang, T. C.; Kao-Walter, Sharon Journal article in Int. J. of Solids and Structures;40 (2003)	peer-reviewed scientific ARTICLE

A critical appraisal of the interfacial toughness of ceramic matrix c...
Warren, R.; Nilsson, M.; Swain, M.V. Journal article in Key Engineering Materials (1999)	peer-reviewed scientific ARTICLE

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