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1.
  • Angenendt, Knut, et al. (författare)
  • Ionic liquid structures from large DFT calculations using mindless configurations
  • 2010
  • Ingår i: Journal of Physical Chemistry C. - 1932-7447. ; 114, s. 20577-20582
  • Tidskriftsartikel (refereegranskat)abstract
    • Three different popular imidazolium based ionic liquids (ILs); EMI-BF4, EMI-PF6, and EMI-TFSI, have been modeled by DFT calculations (B3LYP/6-311+G*) using large, up to 130 atom cluster models, for a better understanding of the structure and ion ion interactions in these ILs and ILs in general. Particular emphasis has been put on the role of appropriate starting structures and how the present large models differ from the ion-pair models of ILs generally used. The system size normalized ion ion interaction energies are shown to converge rapidly, and conformational equilibria and higher order properties like IR spectra are shown to be valuable as quality criteria. The explicit inclusion of an IL environment by the large cluster approach is also compared to using an implicit, continuum, strategy via SCRF C-PCM calculations.
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2.
  • Bengtsson, Lars, 1963- (författare)
  • Avancerad Elektrisk Mätteknik
  • 1996
  • Bok (övrigt vetenskapligt)abstract
    • Boken är avsedd för fortsättnigskurser i elektrisk mätteknik på högskolenivå. Den lämpar sig också väl som kompletteringslitteratur för kurser i signalbehandling. Innehållet är framför allt koncentrerat till analog och digital frekvensanalys, brusreducerande mätmetoder och AD/DA-omvandlingsmetoder. Ett kapitel tar upp signalbehandling och sambanden mellan analys i tid och rum. Fouriertransformen och faltningsintegralen gås igenom i detalj. Boken avslutas dels med ett kapitel om snabba förlopp i transmissionsledningar, dels med ett kapitel om GPIB-bussen. I appendix finns även en beskrivning av RS-232-kommunikation.
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3.
  • Bengtsson, Lars, 1963- (författare)
  • Electrical Measurement Systems and Methods
  • 2014
  • Bok (övrigt vetenskapligt)abstract
    • This book treats a wide range of aspects on electrical measurement systems and the methods used to acquire data from electronic systems. That includes sensors and sensor design, amplifiers such as differential and charge amplifiers, ADCs and DACs, digital oscilloscopes, cable theory and probes, noise and noise coupling, common and normal mode signals. This first part (chapters 1-8) doesn’t require any advanced mathematics and is aimed towards undergraduates. The second part (chapters 9-17) is on an advanced level (master level) and treats transform theory (Fourier, Laplace, z) and how to handle signals in frequency space. We cover the sampling theorem (Nyquist), resolution bandwidth, frequency spectrum distortions like aliasing and leakage and how to apply windows in a frequency spectrum. We also cover systems and signal processing in time-space, including convolution and correlation, filter theory and filter design (both analog and digital). The last chapters concern the statistical aspects on measurement systems and signals, like point and interval estimations, curve fitting and uncertainty estimations according to the GUM method.
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4.
  • Brucas, Rimantas, 1965-, et al. (författare)
  • Tunneling and charging effects in discontinuous superparamagnetic Ni81Fe19/Al2O3 multilayers
  • 2010
  • Ingår i: Physical Review B. - 1098-0121. ; 81:22
  • Tidskriftsartikel (refereegranskat)abstract
    • The magnetic and transport properties of films based on discontinuous layers of Ni81Fe19 (Py) embedded inAl2O3 were investigated. In films with nominal Py thicknesses 6 and 8 Å superparamagnetic particles withmedian diameters Dmed=2.8 and 3.1 nm and distribution widths s_D=1.2 and 1.3 nm were formed. Current-voltage (IU) curves were measured with the current perpendicular to the film plane. The analyses show that thecharge transport occurs via tunneling; with the charging energy supplied by thermal fluctuations at hightemperature, T>100 K, and by the electric field at low temperature, T<10 K. The separation of the tworegimes allows independent estimates of the mean charging energy <EC>~40 meV for both samples; from theresistance R versus T analyzed in an effective-medium model at high temperature and from I versus U at 4 K.In order to obtain a consistent description of the transport properties, the size distributions must be included toaccount for the deviation from the single size behavior R~exp(EC/kBT) at high T. The scaling parameter inthe relation I \propto (U/Uth−1)^g, where Uth is the threshold for conduction, is estimated to g~2 at 4 K. The superparamagneticrelaxation of the particles becomes blocked below a temperature T~20 K respective 30 K for 6and 8 Å. The magnetic field (B) dependence of the resistance R(B) displays a single maximum of the ratio MR=[R(B)−R(2 T)] /R(2 T) in zero field at room temperature and a characteristic splitting of the peak at 4K, attributed to the blocking. The maxima, ~0.9% for 6 Å and 1.1% for 8 Å, are positioned at fields abouta factor of two to three higher than the coercive fields of the samples
5.
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6.
  • Carini, Giovanni, et al. (författare)
  • Hypersonic attenuation in cesium borate glasses: Relaxation and anharmonicity
  • 2009
  • Ingår i: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING. 15th International Conference on Internal Friction and Mechanical Spectroscopy (ICIFMS-15). Perugia, ITALY. JUL 20-25, 2008. - 0921-5093. ; 521-22, s. 247-250
  • Konferensbidrag (refereegranskat)abstract
    • The internal friction and the sound velocity in a cesium borate glass (Cs(2)O)(0.14)(B(2)O(3))(0.86) were measured at ultrasonic and hypersonic frequencies by Brillouin scattering measurements over the temperature range between 15 and 300 K. The analysis of the experimental results show that, in addition to thermally activated local motions of structural defects, the vibrational anharmonicity contributes substantially to the temperatures dependences of both the hypersonic loss and velocity. It has been also proved that above 150 K the vibrational anharmonicity appears to be governed by the Akhiezer mechanism of phonon viscosity.
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7.
  • Chernikova, Dina, 1982-, et al. (författare)
  • Testing a direct method for evaluating the concentration of boron in a fuel pool using scintillation detectors, and a 252Cf and an 241Am-Be source
  • 2013
  • Ingår i: Proceeding of ESARDA meeting 2013.
  • Konferensbidrag (refereegranskat)abstract
    • The present investigations are aimed at the development and testing of a direct non-destructive method for evaluating the concentration of boron in a fuel pool using scintillation detectors. The method uses a modified ratio between two gamma lines with energy of 480 keV and 2.23 MeV. These lines belong to the capture of a thermal neutron in boron and hydrogen, respectively. The relation between them can reveal the concentration of boron in the fuel pond. The method proposed was tested in a laboratory experiment with a 252Cf and an 241Am-Be source. EJ-309 liquid scintillation detectors were used for measurements of gamma spectra. The concentration of boron in water varied from 1550 ppm to 4200 ppm. The optimization and test studies were performed via MCNPX simulations. The results of these tests are provided in the present paper and they show that the boron content in water can be determined through using the characteristics of gamma lines with energy of 480 keV and 2.23 MeV.
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8.
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10.
  • Engström, Olof, 1943- (författare)
  • Limitations in future high-k materials
  • 2009
  • Ingår i: NANOSIL Workshop at ESSDERC, Athens, Sept. 14 - 18, 2009 (Invited).
  • Konferensbidrag (refereegranskat)
  •  
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