- Net Insight AB
L'invention porte sur l'acces a un flux binaire (B) a canaux et acces multiples comportant des canaux isochrones servant au transfert de trafic asynchrone tandis qu'un paquet de donnees provenant d'un noeud relie audit... more
L'invention porte sur l'acces a un flux binaire (B) a canaux et acces multiples comportant des canaux isochrones servant au transfert de trafic asynchrone tandis qu'un paquet de donnees provenant d'un noeud relie audit flux binaire est recu dans l'un de ses canaux isochrones. On determine alors si ledit paquet de donnees doit ou non etre transfere sur un deuxieme noeud relie audit flux binaire par l'intermediaire d'un autre desdits canaux isochrones. Si c'est le cas, ledit paquet de donnees est transfere sur le deuxieme noeud par l'intermediaire du second desdits canaux isochrones.
Research Interests:
The MEGA spectrometer, invented mainly by Peter Lindblom and Sonja Engman, used a novel approach for high resolution spectroscopy. It consisted of 4 grazing incidence echelle gratings that dispersed the light in series. Echelle grating... more
The MEGA spectrometer, invented mainly by Peter Lindblom and Sonja Engman, used a novel approach for high resolution spectroscopy. It consisted of 4 grazing incidence echelle gratings that dispersed the light in series. Echelle grating works at high diffraction order and thus have a very high dispersion and having several in series further increased the dispersion. The gratings were mounted rigidly and there was no moving parts involved in the spectrometer, instead the pressure of the contained Argon gas was altered, changing the refraction index of the medium, in order to scan the spectrum. My work was to make a FORTRAN program that simulated the spectral properties by solving a set of coupled non-linear grating equations and tabulate the relative positions and intensities of the “ghost” lines that came from other than the main diffraction order. This could be useful for calibrating the spectrometer and understand some properties of it. The MEGA spectrometer never became a “hit” (I’m sorry Peter, but even back in 1985 I was doubtful about the commercial future of the machine that you so enthusiastically pushed... it was a heavy beast with its own set of problems) but nevertheless, here is the thesis if anyone should be interested in the future.
Research Interests: Spectroscopy and Gratings
The rapidly progressing transition from using traditional TDM-based transport mechanisms, such as SDH/SONET, to use IP based transport for broadcast services provides broadcast operators with a possibility to use a converged network... more
The rapidly progressing transition from using traditional TDM-based transport mechanisms, such as SDH/SONET, to use IP based transport for broadcast services provides broadcast operators with a possibility to use a converged network platform for all their services and hence save on infrastructure costs. However, in the trail of this transition, there is a renewed focus on transport quality of service (QoS) issues and related to this, a focus on how to follow up service level agreements (SLAs) given for IP connectivity QoS. This article will discuss these questions with respect to the broadcasters’ needs, while an emphasis will be given to the effects and handling of packet delay variation (PDV) since this is the least known QoS parameter and a good estimator for the general connection performance.
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Shake-up transitions during the Auger decay of the Kr 3d-1np, n=5,6 resonance states have been studied with high photon and electron resolution (<0.1 eV) using the Aladdin undulator beamline in Stoughton, Wisconsin. This resolution... more
Shake-up transitions during the Auger decay of the Kr 3d-1np, n=5,6 resonance states have been studied with high photon and electron resolution (<0.1 eV) using the Aladdin undulator beamline in Stoughton, Wisconsin. This resolution enables us to resolve the complex spectra and study the distribution of intensity between the multiplets of the 4p-2np final states. The intensity distribution between these multiplets has been found to depend strongly on the principal quantum number n, and theoretical intensity calculations are in good agreement with experiment. Correspondingly, shake fractions differ for each parent and also depend strongly on whether the electron is excited to the first or second Rydberg orbital.
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... This work 1 2 3 4 5 6 I 8 9 10 11 Physica Scripta 33 Page 4. 414 G. Kindvall, M. Larsson, B. Olsson and P. Sigray ... There is no theoreti-cal data to compare the present result with. References 1. Dayton, IE, Dalby, FW and Bennet,... more
... This work 1 2 3 4 5 6 I 8 9 10 11 Physica Scripta 33 Page 4. 414 G. Kindvall, M. Larsson, B. Olsson and P. Sigray ... There is no theoreti-cal data to compare the present result with. References 1. Dayton, IE, Dalby, FW and Bennet, RG, J. Chem. Phys. 33,179 (1960). ...
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Dissociation fragments, following 20 keV electron impact on supersonic jet targets of methane, methanol and ethanol, have been analysed to determine rotational temperatures. The intensities of individual rotational lines of the CH A2... more
Dissociation fragments, following 20 keV electron impact on supersonic jet targets of methane, methanol and ethanol, have been analysed to determine rotational temperatures. The intensities of individual rotational lines of the CH A2 Delta-X2Pi, CH B2∑- -X2Pi and CH+A1 Pi-X1∑+ transitions were measured and fitted to Boltzmann distributions. The temperatures obtained were about 4000 K for the CH A-X, 2000 K for the B-X and 1650 K for the CH+A-X transitions. The recorded spectra showed distributions at single temperatures. The intensities were also fitted to theoretical distributions in order to obtain excess energies. Possible fragmentation mechanisms are discussed.
Research Interests:
The experimental high-frequency deflection (HFD) technique and the theoretical complete active space SCF (CAS SCF) ab initio method have been used to investigate the radiative properties of the A 3Π state of NH. Fluorescence lifetimes of... more
The experimental high-frequency deflection (HFD) technique and the theoretical complete active space SCF (CAS SCF) ab initio method have been used to investigate the radiative properties of the A 3Π state of NH. Fluorescence lifetimes of rotational fine-structure levels were measured for ν' = 0 and 1. These measurements gave a lifetime of τ (ν' = 0, N' = 1,Fle)=453 ± 10 ns. Radiative lifetimes were calculated with the help of non-orthogonal CAS SCF wavefunctions and the result for ν = 0 was 408 ns. Small discrepancies between measured and calculated lifetimes are discussed in terms of a predissociation in the A 3Π state caused by the continuum of the X 3Σ− ground state. Model calculations suggest that these discrepancies can be removed if the nonradiative process A 3Π (bound)→ X 3Σ− (continuum) is taken into account.
Traditional session control is not a sufficient solution in a multimedia services network, it must be renewed in order to handlemultimedia and multiuser sessions. In this paper we address this issue and present a proposal for a solution,... more
Traditional session control is not a sufficient solution in a multimedia services network, it must be renewed in order to handlemultimedia and multiuser sessions. In this paper we address this issue and present a proposal for a solution, which wecall Distributed Session Control (DiSC). DiSC can be seen both as an overall solution for session control in a network, andsimply
Research Interests:
The rapidly progressing transition from using traditional TDM-based transport mechanisms, such as SDH/SONET, to use IP based transport for broadcast services provides broadcast operators with a possibility to use a converged network... more
The rapidly progressing transition from using traditional TDM-based transport mechanisms, such as SDH/SONET, to use IP based transport for broadcast services provides broadcast operators with a possibility to use a converged network platform for all their services and hence save on infrastructure costs. However, in the trail of this transition, there is a renewed focus on transport quality of service (QoS) issues and related to this, a focus on how to follow up service level agreements (SLAs) given for IP connectivity QoS. This article will discuss these questions with respect to the broadcasters’ needs, while an emphasis will be given to the effects and handling of packet delay variation (PDV) since this is the least known QoS parameter and a good estimator for the general connection performance.
Research Interests:
G. Dujardin 1 , L. Hellner 1 , BJ Olsson 2 , MJ Besnard-Ramage 1 , and A. Dadouch 1 1 Laboratoire de Photophysique Moléculaire, Bâtiment 213, Université de Paris-Sud, 91405 Orsay, France, and Laboratoire pour l&#x27;Utilisation du... more
G. Dujardin 1 , L. Hellner 1 , BJ Olsson 2 , MJ Besnard-Ramage 1 , and A. Dadouch 1 1 Laboratoire de Photophysique Moléculaire, Bâtiment 213, Université de Paris-Sud, 91405 Orsay, France, and Laboratoire pour l&#x27;Utilisation du Rayonnement Electromagnétique, Centre ...
Research Interests:
Results are presented on experimental studies designed to search for quasi-bound electronic states of CO(2+) by means of photoion/photon-of-fluorescence coincidence and kinetic-energy-release spectroscopy. By comparison with the ab initio... more
Results are presented on experimental studies designed to search for quasi-bound electronic states of CO(2+) by means of photoion/photon-of-fluorescence coincidence and kinetic-energy-release spectroscopy. By comparison with the ab initio calculations of Larsson et al. (1989), the following assignments were deduced: 41.25 eV = 3 Pi 1Sigma(+), 41.3 eV = 3Pi, 41.8 eV = 1Pi, and 43.8 eV = 3Sigma(+). The two lowest states are observed to be quasi-stable states (capable of surviving for a few microsec), whereas the two higher states are detected as rapidly dissociating states (lifetime less than 1 microsec).
Research Interests:
Potential energy curves for a number of electronic states of the doubly charged CO2+ dications have been calculated with the complete active space SCF (CASSCF) and multireference contracted CI( (MRCCI) methods with a one-particle basis... more
Potential energy curves for a number of electronic states of the doubly charged CO2+ dications have been calculated with the complete active space SCF (CASSCF) and multireference contracted CI( (MRCCI) methods with a one-particle basis set of medium size ([8s, 6p, 2d]). The computed results are compared with results obtained from experimental investigations such as Auger spectroscopy, time-of-flight mass spectrometry, energy gain spectroscopy, double electron capture and ion translational energy spectrometery.
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ABSTRACT We report the design, construction, and performance of a soft x‐ray beam line with accessible photon energy 0.8–4.0 keV at the Synchrotron Radiation Center, University of Wisconsin–Madison. The beam line features an... more
ABSTRACT We report the design, construction, and performance of a soft x‐ray beam line with accessible photon energy 0.8–4.0 keV at the Synchrotron Radiation Center, University of Wisconsin–Madison. The beam line features an ultrahigh‐vacuum (UHV) compatible high‐precision double‐crystal monochromator (DCM) covering Bragg angles 12°–72°, which was designed and built at the Physical Science Laboratory (PSL), University of Wisconsin–Madison. The monochromatic x rays are focused by a bent cylindrical mirror (Ni‐coated fused silica, located 7.5 m from the source) into the experimental chamber (located 5.5 m from the mirror) down to a spot less than 1 mm(h)×3 mm(v). During the initial runs, the DCM used a pair of InSb(111) crystals and covered photon energy 1.75–3.7 keV. At the silicon K edge (1840 eV), the beam line delivered about 4×1011 photons/s with stored electron beam at 100 mA at 1 Gev, among the most intense and stable sources currently available at this energy. The energy resolution is about 0.9 eV at the Si K edge.
Research Interests:
ABSTRACT We report the design, construction, and performance of a soft x‐ray beam line with accessible photon energy 0.8–4.0 keV at the Synchrotron Radiation Center, University of Wisconsin–Madison. The beam line features an... more
ABSTRACT We report the design, construction, and performance of a soft x‐ray beam line with accessible photon energy 0.8–4.0 keV at the Synchrotron Radiation Center, University of Wisconsin–Madison. The beam line features an ultrahigh‐vacuum (UHV) compatible high‐precision double‐crystal monochromator (DCM) covering Bragg angles 12°–72°, which was designed and built at the Physical Science Laboratory (PSL), University of Wisconsin–Madison. The monochromatic x rays are focused by a bent cylindrical mirror (Ni‐coated fused silica, located 7.5 m from the source) into the experimental chamber (located 5.5 m from the mirror) down to a spot less than 1 mm(h)×3 mm(v). During the initial runs, the DCM used a pair of InSb(111) crystals and covered photon energy 1.75–3.7 keV. At the silicon K edge (1840 eV), the beam line delivered about 4×1011 photons/s with stored electron beam at 100 mA at 1 Gev, among the most intense and stable sources currently available at this energy. The energy resolution is about 0.9 eV at the Si K edge.
Research Interests:
Research Interests:
... level A. Dadouch, G. Dujardin, L. Hellner, and M. J.Besnard-II&#x27;amage Laboratoire de Photophysique Moleculaire, Mti ment 213, Universi te de Paris Sud, 91405 Orsay, France and Laboratoire pour I&#x27;Utilisation du... more
... level A. Dadouch, G. Dujardin, L. Hellner, and M. J.Besnard-II&#x27;amage Laboratoire de Photophysique Moleculaire, Mti ment 213, Universi te de Paris Sud, 91405 Orsay, France and Laboratoire pour I&#x27;Utilisation du Rayonnement Electromagnetique, Uniuersite de Paris Sud ...
Research Interests:
ABSTRACT
Research Interests:
ABSTRACT The high resolution synchrotron photoelectron spectra (PES) of furan and thiophene are obtained at 90–200 eV photon energy. Several ionization peaks attributed to inner valence orbitals and correlation (satellite) states are... more
ABSTRACT The high resolution synchrotron photoelectron spectra (PES) of furan and thiophene are obtained at 90–200 eV photon energy. Several ionization peaks attributed to inner valence orbitals and correlation (satellite) states are resolved for the first time. By using the photon energy dependence of the ionization cross sections of the valence orbitals and the correlation states, significant insight into the dominant character of the valence orbitals and correlation states of furan and thiophene is attained. Two classes of a1-type molecular orbitals in furan, two classes of b2-type molecular orbitals in furan and two types of correlation (satellite) states in thiophene are distinguished by the present procedure. Some limitations of the photon energy dependence of molecular photoionization cross sections are also discussed.
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ABSTRACT The high resolution photoelectron valence satellite spectra of neon have been obtained at 90 and 150 eV photon energies with total experimental resolution of 140 meV fwhm and 200 meV fwhm, respectively. The satellite intensity... more
ABSTRACT The high resolution photoelectron valence satellite spectra of neon have been obtained at 90 and 150 eV photon energies with total experimental resolution of 140 meV fwhm and 200 meV fwhm, respectively. The satellite intensity ratio (peak p main) obtained in these high resolution spectra confirms and extends earlier experimental observations regarding the unusual energy dependence of this satellite intensity ratio. This ratio is found to increase with increasing photon energy contrary to the observed ratios for the other satellites of neon. Some possible explanations for this behaviour are discussed.
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ABSTRACT The fluorescence lifetime of the v′=0 level of the N2+2 D 1 ∑+u electronic state has been measured, with the high frequency deflection technique, for the first time. The result, τ=6.0±0.5 ns, is in good agreement with a recent... more
ABSTRACT The fluorescence lifetime of the v′=0 level of the N2+2 D 1 ∑+u electronic state has been measured, with the high frequency deflection technique, for the first time. The result, τ=6.0±0.5 ns, is in good agreement with a recent photoion–photon of fluorescence coincidence measurement which yields a lifetime, averaged over an unspecified number of vibrational levels, of 8±3 ns. The electronic transition moment function for the N2+2 D 1 ∑+u–X 1 ∑+g transition was calculated with nonorthogonal complete active space SCF wave functions. Potential energy curves for the X 1 ∑+g and D 1 ∑+u states were calculated with a multireference contracted CI treatment and these potential curves were used, together with the electronic transition moment function, to obtain vibrationally averaged transition moments and hence a theoretical radiative lifetime. The calculated lifetime, 8.0 ns, is in good agreement with the experimentally determined value indicating that the decay of D 1 ∑+u, v′=0 occurs primarily via fluorescence to the X 1 ∑+g state.
Research Interests:
Research Interests:
... The atomic basis sets used in the present work consisted, for chlorine, of a (14s, lop, 5d) Gaussian basis set in a (7s, 5p, 3d) contraction, as described by Pettersson ... Spectrosc. 113 159 Cossart D, Launay F, Robbe J M and Gandara... more
... The atomic basis sets used in the present work consisted, for chlorine, of a (14s, lop, 5d) Gaussian basis set in a (7s, 5p, 3d) contraction, as described by Pettersson ... Spectrosc. 113 159 Cossart D, Launay F, Robbe J M and Gandara G 1985 J. Mol. Spectrosc. ...
Research Interests:
Research Interests:
The MEGA spectrometer, invented mainly by Peter Lindblom and Sonja Engman, used a novel approach for high resolution spectroscopy. It consisted of 4 grazing incidence echelle gratings that dispersed the light in series. Echelle grating... more
The MEGA spectrometer, invented mainly by Peter Lindblom and Sonja Engman, used a novel approach for high resolution spectroscopy. It consisted of 4 grazing incidence echelle gratings that dispersed the light in series. Echelle grating works at high diffraction order and thus have a very high dispersion and having several in series further increased the dispersion. The gratings were mounted rigidly and there was no moving parts involved in the spectrometer, instead the pressure of the contained Argon gas was altered, changing the refraction index of the medium, in order to scan the spectrum.
My work was to make a FORTRAN program that simulated the spectral properties by solving a set of coupled non-linear grating equations and tabulate the relative positions and intensities of the “ghost” lines that came from other than the main diffraction order. This could be useful for calibrating the spectrometer and understand some properties of it.
The MEGA spectrometer never became a “hit” (I’m sorry Peter, but even back in 1985 I was doubtful about the commercial future of the machine that you so enthusiastically pushed... it was a heavy beast with its own set of problems) but nevertheless, here is the thesis if anyone should be interested in the future.
My work was to make a FORTRAN program that simulated the spectral properties by solving a set of coupled non-linear grating equations and tabulate the relative positions and intensities of the “ghost” lines that came from other than the main diffraction order. This could be useful for calibrating the spectrometer and understand some properties of it.
The MEGA spectrometer never became a “hit” (I’m sorry Peter, but even back in 1985 I was doubtful about the commercial future of the machine that you so enthusiastically pushed... it was a heavy beast with its own set of problems) but nevertheless, here is the thesis if anyone should be interested in the future.
Research Interests:
The transition from synchronous transport methods to IP for production quality video and audio services implies a deterioration of the timing quality of the signals, since IP is a completely asynchronous transport format. IEEE 1588 (PTP)... more
The transition from synchronous transport methods to IP for production quality video and audio services implies a deterioration of the timing quality of the signals, since IP is a completely asynchronous transport format. IEEE 1588 (PTP) has been introduced to convey precise timing over an IP network. In the Studio LAN, reaching the required quality level of timing transport with PTP is manageable, but doing it in the WAN is very challenging. In practice the only wide area solution today is to use GPS controlled Grand Master (GM) clocks at each remote location to provide synchronization with sufficient quality. This scheme has some disadvantages in that it depends on that a GPS signal is always available, which may not be the case, for several reasons. The industry also needs solutions for PTP transport over the terrestrial WANs. We will describe the challenges with PTP over the WAN, but also show how a synchronous overlay on top of the IP network can provide sufficient PTP quality over the WAN for professional Audio and Video services without resorting to GPS controlled GMs at each end point. Real operational cases using this functionality will be described.