| 1. |
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| 2. |
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| 3. |
- Lindgren, Johan, et al.
(författare)
-
The first neoceratopsian dinosaur remains from Europe
- 2007
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Ingår i: Palaeontology. - : Wiley. - 1475-4983 .- 0031-0239. ; 50:4, s. 929-937
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Tidskriftsartikel (refereegranskat)abstract
- Shallow marine, nearshore strata of earliest Campanian (Gonioteuthis granulataquadrata belemnite Zone) and latest Early Campanian (informal Belemnellocamax mammillatus belemnite zone) age in the Kristianstad Basin, southern Sweden, have yielded isolated leptoceratopsid teeth and vertebrae, representing the first record of horned dinosaurs from Europe. The new leptoceratopsid occurrence may support a European dispersal route for the Leptoceratopsidae, or may represent an entirely endemic population. The presence of leptoceratopsid teeth in shallow marine deposits contradicts previous hypotheses suggesting that basal neoceratopsians mainly preferred and and/or semi-arid habitats far from coastal areas.
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| 4. |
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| 5. |
- Antoni, Per, et al.
(författare)
-
Europium confined cyclen dendrimers with photophysically active triazoles
- 2008
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Ingår i: Journal of Materials Chemistry. - : Royal Society of Chemistry (RSC). - 0959-9428 .- 1364-5501. ; 18:22, s. 2545-2554
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Tidskriftsartikel (refereegranskat)abstract
- Dendrimers up to the fourth generation (G1-G4) were successfully synthesized via the efficient copper catalyzed 1,3-dipolar cycloaddition between primary alkynes and azides (CuAAC), also referred to as a click reaction. The synthetic protocol involved the preparation of presynthesized dendron wedges that subsequently were attached to a tetra-valent alkyne functional cyclen core. These constructed structures integrated stable triazole groups "intra-locked'' between the cyclen and dendron wedges. The incorporation of a lanthanide metal ion, europium, into the interior of all cyclen dendrimers was monitored by FT-IR. Interestingly, the photophysical results showed that the proximate triazole not only acts as a stable linker but also as a sensitizers, transferring its singlet-singlet excitation in the ultraviolet region (270-290 nm) to the partially filled luminescent lanthanide 4f shell. An increase of luminescence decay time from the lanthanide D-5(0) -> F-7(2) emission was observed with increasing dendrimer size, indicating that the shielding effect of the dendron wedges is important for the relaxation of the photo-excitation and energy transfer. To the best of our knowledge, this is the first time a set of dendron wedges have successfully been attached to a cyclen metal ion cage via the versatile click reaction. Furthermore, the produced triazoles intra-locked in close proximity to the macrocycle core elucidated an interesting photophysical function.
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| 6. |
-
Brain Talk : discourse with and in the brain : papers from the first Birgit Rausing Language Program Conference in Linguistics, Lund, June 2008
- 2009
-
Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- Brain Talk had as its theme, different aspects of language processing in the brain. The contributions focussed on the importance of context for the neurocognitive processing of language and speech in various communicative situations. The present volume, the first in the Birgit Rausing Language program conference series, contains papers from the Brain talk conference. They have been grouped in to six general areas of research in language processing in the brain: Lexicon, Syntax, Pragmatics, Prosody, Processing and modelling, and Clinical aspects.
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| 7. |
- Brandin, Mathias, et al.
(författare)
-
The Synchrotron Radiation and Free Electron Laser Project MAX IV at MAX-lab
- 2008
-
Ingår i: Journal of Physics Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 100
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The proposed MAX IV facility at MAX-lab, Lund University is presented. The project consists of two storage rings at 1.5 and 3 GeV respectively, a 3 GeV linac injector, a facility for short pulses and a Free Electron Laser. The storage rings will cover a broad spectral range and are designed to reach the diffraction limit in a large wavelength range. A new innovative magnet concept and lattice form the back bone of the ring design. Short photon pulses will be generated with compressed pulses from the linac system and coherent pulses by a Free Electron Laser operating in the HGHG mode. The project has received the highest marks in the scientific evaluations both concerning machine design and scientific program.
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| 8. |
- Börjesson, L., et al.
(författare)
-
Green liquor clarification method for cellulose pulp production, involves using filtering layer which is made of membrane material with pores having predetermined pore size.
- 2009
-
Patent (populärvet., debatt m.m.)abstract
- NOVELTY - The green liquor clarification method involves filtering of flowing suspension containing solids and bringing in contact with a first filter unit (4). The filter unit consists of filter elements (12) with filter bodies having filter channels. A part of the suspension is forced to pass through the filtering layer to forming a filtrate while the solids substantially remain in a residual part of the suspension forming a slurry. The filtering layer is made of a membrane material with pores having a pore size of 0.1-10 micrometer (um), more preferred 0.1-5 um and most preferred 0.2-1.0 um. USE - Green liquor clarification method for cellulose pulp production. ADVANTAGE - Provides a filtering process which is a continuous process with no build up of a filter cake and is very effective in leading to a very high separation degree of dregs which is up to almost 100 percent and the filtrated green liquor is almost free from slurry. Characteristic green color of the green liquor is removed with the dregs which simplifies the identification both of disturbances in the filtration process and in the recovery flimace under normal operating conditions. Investment costs for the cross-flow filtration equipment is very minimal. The space required is much smaller than the space required for the sedimentation tanks. Minimizes oxidation of the valuable sulfide content of the green liquor since there is no contact with the surrounding air, nor is pressurized air used in the equipment. The closed system with no contact with surrounding air or use of vacuum shows that the temperature of the green liquor is maintained at a high level. The modular design of the filters facilitates an incremental capacity increase with minimal investment cost. Provides a simple system with minimal moving parts so less labor is needed for oversight and maintenance. Provides less lime make-up or decreased content of inerts in the lime at the same make-up rate due to less particles in the green liquor Less dregs carryover improves clarification of white liquor and improves mud dewatering and lower energy consumption. Enables efficient removal of non-process elements for minimum operation cost and low landfill volumes. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an arrangement for green liquor clarification. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic of an arrangement for cleaning green liquor using cross-flow filtration. First filter unit (4) Filter elements (12) Conduit (21) Tank (40) Collecting tank (42)
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| 9. |
- Erikson, Arne, et al.
(författare)
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Quantification of the second-order nonlinear susceptibility of collagen I using a laser scanning microscope
- 2007
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Ingår i: Journal of Biomedical Optics. - : SPIE-Intl Soc Optical Eng. - 1083-3668 .- 1560-2281. ; 12:4
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Tidskriftsartikel (refereegranskat)abstract
- Characteristic changes in the organization of fibrillar collagen can potentially serve as an early diagnostic marker in various pathological processes. Tissue types containing collagen I can be probed by pulsed high-intensity laser radiation, thereby generating second harmonic light that provides information about the composition and structure at a microscopic level. A technique was developed to determine the essential second harmonic generation (SHG) parameters in a laser scanning microscope setup. A rat-tail tendon frozen section was rotated in the xy-plane with the pulsed laser light propagating along the z-axis. By analyzing the generated second harmonic light in the forward direction with parallel and crossed polarizer relative to the polarization of the excitation laser beam, the second-order nonlinear optical susceptibilities of the collagen fiber were determined. Systematic variations in SHG response between ordered and less ordered structures were recorded and evaluated. A 500µm-thick z-cut lithiumniobate (LiNbO3) was used as reference. The method was applied on frozen sections of malignant melanoma and normal skin tissue. Significant differences were found in the values of d22, indicating that this parameter has a potential role in differentiating between normal and pathological processes.
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| 10. |
- Eriksson, Johan, et al.
(författare)
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Using Timber in a multi-body design environment to develop reliable embedded software
- 2008
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Ingår i: Intelligent vehicle iniative (IVI) technology controls and navigation systems, 2008. - Warrendale, Pa. : Society of Automotive Engineers, Incorporated. - 9780768020359 - 768020352 - 0768020352
-
Konferensbidrag (refereegranskat)abstract
- A major challenge for the automotive industry is to reduce the development time while meeting quality assessments for their products. This calls for new design methodologies and tools that scale with the increasing amount and complexity of embedded systems in today's vehicles.In this paper we undertake an approach to embedded software design based on executable models expressed in the high-level modelling paradigm of Timber. In this paper we extend previous work on Timber with a multi-paradigm design environment, aiming to bridge the gap between engineering disciplines by multi-body co-simulation of vehicle dynamics, embedded electronics, and embedded executable models. Its feasibility is demonstrated on a case study of a typical automotive application (traction control), and its potential advantages are discussed, as highlighted below:shorter time to market through concurrent, co-operative distributed engineering, andreduced cost through adequate system design and dimensioning, andimproved efficiency of the design process through migration and reuse of executable software components, andreduced need for hardware testing, by specification verification on the executable model early in the design process, andimproved quality, by opening up for formal methods for verification.
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| 11. |
- Eriksson, Mikael, et al.
(författare)
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MAX-IV Design: Pushing the Envelope
- 2007
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Ingår i: 2007 IEEE Particle Accelerator Conference, vols 1-11. - 9781424409167 ; , s. 1277-1279
-
Konferensbidrag (refereegranskat)abstract
- The proposed MAX IV facility is meant as a successor to the existing MAX-lab. The accelerator part will consist of three storage rings, two new ones operated at 3 and 1.5 GeV respectively and the existing 700 MeV MAX III ring. The two new rings have identical lattices and are placed on top of each other. Both these rings have a very small emittance, 0.86 and 0.4 nm rad respectively, and offer synchrotron radiation of very high mean brilliance. As an injector, a 3 GeV linear accelerator is planned. The design philosophy and the special technical solutions called for are presented in this paper.
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| 12. |
- Eriksson, Mikael, et al.
(författare)
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Some small-emittance light-source lattices with multi-bend achromats
- 2008
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - : Elsevier BV. - 0167-5087 .- 0168-9002. ; 587:2-3, s. 221-226
-
Tidskriftsartikel (refereegranskat)abstract
- Two examples of low-emittance light-source lattices are discussed. Both use similar building blocks consisting of 7-bend achromats. The small emittances generated by these lattices are further reduced by the introduction of insertion devices (IDs), resulting in beam emittance values ranging from 0.2 to 0.9 nm rad, depending on the number of achromats chosen. The two examples discussed here are rings with 12 and 20 achromats. The performances of any intermediate number of achromats can easily be estimated. A higher number of achromats of this type seems to result in an uncomfortably small dynamic aperture. The Touschek losses and Intra Beam Scattering (IBS) effect are calculated together with some means to reduce their impact. To calculate this impact, certain technical solutions are assumed, which are described. Other technical solutions could naturally be chosen. The impact of emittance on brilliance is also discussed and the brilliance curves for the two cases are presented and compared with the zero-emittance case ("ultimate source"). (C) 2008 Elsevier B.V. All rights reserved.
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| 13. |
- Eriksson, Mikael, et al.
(författare)
-
STATUS OF THE MAX IV LIGHT SOURCE PROJECT
- 2006
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Ingår i: European Particle Accelerator Conference 2006, Edinburgh, UK.
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 14. |
- Eriksson, Mikael, et al.
(författare)
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Using Multi-Bend Achromats in Synchrotron Radiation Sources
- 2008
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Ingår i: Proceedings of EPAC08. ; , s. 2007-2009
-
Konferensbidrag (refereegranskat)abstract
- Multi-bend achromats offer small electron beam emittance, large energy acceptance and a good dynamic aperture. Two examples are discussed below, each using 7-bend achromats; a 12 achromat lattice and a 20 achromat one. Some possible technical solutions associated with the dense lattices are discussed: magnet technology, vacuum system and RF system. Some characteristics of the two rings are also presented; effects of Intra Beam Scattering, Touschek life-time and the electron beam parameter values.
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| 15. |
- Glimsdal, Eirik, et al.
(författare)
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Excited States and Two-Photon Absorption of Some Novel Thiophenyl Pt(II)-Ethynyl Derivatives
- 2007
-
Ingår i: JOURNAL OF PHYSICAL CHEMISTRY A. - : American Chemical Society (ACS). - 1089-5639 .- 1520-5215. ; 111, s. 244-50
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Tidskriftsartikel (refereegranskat)abstract
- The photophysical characterization of two new compounds related to bis((4-(phenylethynyl)phenyl)ethynyl)bis(tributylphosphine)platinum(II), here abbreviated Pt1, is reported. For the first new compound ATP1, the inner phenyl rings (closer to the Pt atom) in Pt1 are replaced by thiophene rings bridging at the 2,5-positions. In compound ATP2, the outer phenyl groups are replaced by thiophene rings bonded at the 2-position. Specifically, we report on the fluorescence quantum yield, two-photon absorption, triplet decay times and two-photon absorption induced emission spectra of the molecules in THF solutions. The results were compared with those of Pt1 and Pt1 capped with an acetonide-protected 2,2-bis(methylol)propionic acid (bis-MPA) ester group (Pt1-G1). The photophysical properties of the organic dye 7-(diethylamino)coumarin (Coumarin 110) were determined and used as a reference material. The two-photon absorption cross section around 720-740 nm of ATP1 and ATP2 was found to be of the same order of magnitude as for Pt1-G1, i.e., between 5 and 10 GM, but slightly larger for ATP1 than for ATP2 (1 GM = 1 Goppert-Mayer = 10(-50) (cm(4) s)/photon). The fluorescence decay time of all compounds was found to be very short (subnanosecond) with quantum yields 0.0045, 0.0007, 0.0011 and 0.0020 for ATP1, ATP2, Pt1-G1 and Pt1, respectively, measured at excitation wavelength 373 nm. Just as Pt1 and Pt1-G1, both thiophenyl derivatives showed large intersystem crossing capabilities and phosphorescence, characteristic for a triplet state that can enhance the nonlinear absorption and optical power limiting by triplet state absorption. The phosphorescence emission of the thiophenyl derivatives was red-shifted in comparison with Pt1 and Pt1-G1, and the phosphorescence decay times were on the order of 200-500 ns, as for the Pt1 compound.
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| 16. |
- Glimsdal, Eirik, et al.
(författare)
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Triplet excited states of some thiophene and triazole substituted platinum(II) acetylide chromophores
- 2009
-
Ingår i: Journal of Physical Chemistry A. - Washington : American Chemical Society (ACS). - 1089-5639 .- 1520-5215. ; 113:14, s. 3311-3320
-
Tidskriftsartikel (refereegranskat)abstract
- The photophysical properties of a series of platinum(II) acetylide compounds (trans-Pt(PBu(3))(2)(CC-R)(2)) with the R group consisting of two or three aryl rings (phenyl, phenyl/thiophenyl, phenyl/triazolyl) linked together with ethynyl groups were systematically investigated. Four new structurally similar compounds are reported with: (i) a bithiophene unit in the ligands, (ii) methyl or (iii) methoxy substituents on the aryl ring ligands that promote a more twisted conformation along the long axis of the molecule, and (iv) with two different alkynylaryl ligands giving rise to an asymmetric substitution with respect to the photoactive metal ion center. The spectroscopic studies include optical absorption, spectrally and time-resolved luminescence, as well as transient absorption spectra. The ground-state UV absorption between 300 and 420 nm gave rise to fluorescence with quantum efficiencies in the range of 0.1-1% and efficient intersystem crossing to triplet states. Phosphorescence decay times were in the order of 10-500 mus in oxygen-evacuated samples. The triplet states also lead to strong broadband triplet-triplet absorption between 400 and 800 nm. The complex with asymmetric substitution was found to populate two triplet states of different structure and energy.
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| 17. |
- Hadad, Rabie, et al.
(författare)
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A Theoretical / Empirical study of void closure in heavy plate hot rolling of tool steel
- 2009
-
Ingår i: Metallurgy and New Materials Researches / Cercetari metalurgice, si de noi materiale. - Bucarest : Societatea Româna de Metalurgie. - 1221-5503. ; 17:1, s. 9-26
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- By the introduction of TOOLOX®, SSAB in Oxelösund has turned into a new market segment, including heavier sizes and dramatically increased requirements on inner quality of the plate. To be able to determine the minimum reduction from slab to finished plate with acceptable inner quality, a study was made, to evaluate the minimum reduction for a given requirement of inner quality. By experimental rolling in the heavy plate mill in Oxelösund it has been proven that more than 40 % total reduction is necessary for total closure of voids under the geometrical deformation conditions in that mill. The total reduction is more important than the geometrical rolling conditions, and heavy pass reductions are favourable for void closure. The closure of internal defects can be improved by cooling the surface of the slabs.
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| 18. |
- Henfridsson, Ola, et al.
(författare)
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SeamlessTalk : User-Controlled Session Management for Sustained Car Conversations
- 2005
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Ingår i: The Interaction Society. - Hershey, PA : Information Science Publishing. - 1591405300 ; , s. 304-318
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This chapter approaches sustained car conversations across mobile phones and in-car phone resources as a session management problem. Addressing this problem, the chapter outlines a session management model for user-controlled media switches during ongoing phone conversations. The model makes a distinction between the user and the infrastructure levels of session management. To illustrate and validate the rationale of the model, the chapter presents an in-car mobile phone hands-free system, SeamlessTalk, developed to support sustained car conversations. The user-controlled session management model contributes to current research on session management by addressing the explicit/implicit session management dichotomy in multiple media situations.
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| 19. |
- Hällstig, Emil, et al.
(författare)
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Polarization properties of a nematic liquid-crystal spatial light modulator for phase modulation
- 2005
-
Ingår i: Optical Society of America. Journal A. - 1084-7529 .- 1520-8532. ; 22:1, s. 177-184
-
Tidskriftsartikel (refereegranskat)abstract
- The polarization properties of a nematic zero-twist liquid-crystal (NLC) spatial light modulator (SLM) were studied. A large ratio between the liquid-crystal (LC) layer thickness and the pixel pitch combined with spatial variations in the applied electric field causes fringing fields between pixels. Depending on the LC alignment, the electric field components within the LC layer can result in a twist deformation. The produced inhomogeneous optical anisotropy affects the polarization of light propagating through the device. We experimentally examined polarization effects in different diffraction orders for both binary and blazed phase gratings. Simulations of the LC deformation together with finite-difference time-domain simulations for the optical propagation were used to calculate the corresponding far-field intensities. It was demonstrated how rigorous simulations of the NLC SLM properties can be used to understand the polarization features of different diffraction orders.
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| 20. |
- Jarvis, Åsa, et al.
(författare)
-
Activity and composition of ammonia oxidizing bacterial communities and emission dynamics of NH3 and N2O in a compost reactor treating organic household waste
- 2009
-
Ingår i: JOURNAL OF APPLIED MICROBIOLOGY. - : Oxford University Press (OUP). - 1364-5072 .- 1365-2672. ; 106:5, s. 1502-1511
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Tidskriftsartikel (refereegranskat)abstract
- To monitor emissions of NH3 and N2O during composting and link these to ammonia oxidation rates and the community structure of ammonia oxidizing bacteria (AOB). A laboratory-scale compost reactor treating organic household waste was run for 2 months. NH3 emissions peaked when pH started to increase. Small amounts of N2O and CH4 were also produced. In total, 16% and less than 1% of the initial N was lost as NH3-N and N2O-N respectively. The potential ammonia oxidation rate, determined by a chlorate inhibition assay, increased fourfold during the first 9 days and then remained high. Initially, both Nitrosospira and Nitrosomonas populations were detected using DGGE analysis of AOB specific 16S rRNA fragments. Only Nitrosomonas europaea was detected under thermophilic conditions, but Nitrosospira populations re-established during the cooling phase. Thermophilic conditions favoured high potential ammonia oxidation rates, suggesting that ammonia oxidation contributed to reduced NH3 emissions. Small but significant amounts of N2O were emitted during the thermophilic phase. The significance of different AOBs detected in the compost for ammonia oxidation is not clear. This study shows that ammonia oxidation occurs at high temperature composting and therefore most likely reduces NH3 emissions.
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| 21. |
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| 22. |
- Johansson, Jonny, et al.
(författare)
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Project: EISCAT 3D
- 2007
-
Annan publikation (populärvet., debatt m.m.)
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| 23. |
- Jonsson, P., et al.
(författare)
-
Detection of fluorescence spectra of individual bioaerosol particles
- 2005
-
Ingår i: Proc SPIE Int Soc Opt Eng. - : SPIE.
-
Konferensbidrag (refereegranskat)abstract
- We present initial results of a measurement system designed for detecting the fluorescence spectrum of individual particles of biological warfare agent (BWA). A compact optical parametric oscillator with intracavity sum-frequency mixing and a commercial Nitrogen gas laser was used as excitation sources to generate 293 nm or 337 nm UV laser irradiation. The pulsed lasers and a photomultiplier tube (PMT) array based spectrometer were triggered by a red laser-diode and a PMT detector that sensed the presence of a particle typical of size 5-20 μm in diameter. The spectral detection part of the system consisted of a grating and a PMT array with 32 channels, which measured fluorescence in the wavelength from 280 nm to 800 nm. The detector system was used to demonstrate the measurement of laser induced fluorescence spectra of individual BWA simulant particles by excitation of single UV laser pulses. The spectrum obtained by averaging spectra from several BWA aerosol simulant particles were found generally similar, but not identical, to the fluorescence spectrum obtained from water solutions containing the same particles dissolved.
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| 24. |
- Jonsson, P., et al.
(författare)
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Development of fluorescence-based LIDAR technology for biological sensing
- 2005
-
Ingår i: 2005 MRS Spring Meeting - Symposium FF. - : Materials Research Society. ; , s. 51-62
-
Konferensbidrag (refereegranskat)abstract
- Results of our on-going development of biological warfare agents (BWA) detection systems based on spectral detection of ultraviolet (UV) laser induced fluorescence (LIF) are presented. A compact optical parametric oscillator (OPO) with intracavity sum-frequency mixing (SFM) to generate 293 nm UV laser irradiation was developed. The OPO/SFM device was pumped by a diode-pumped Nd:YAG laser (1064 nm), including subsequent second-harmonic generation (SHG) in an external periodically poled KTiOPO4 (PPKTP) crystal. The laser generated 1.8 ns pulses at 100 Hz with an average power of 44 mW at 532 nm. The whole system could be used to deliver approximately 30 μJ laser irradiation per pulse (100 Hz) at 293 nm. The spectral detection part of the system consists of a grating and a photomultiplier tube (PMT) array with 32 channels, which can measure fluorescence spectra in the wavelength band from 250 nm to 800 nm. The detector system was designed along with a trigger laser to enable measurement of fluorescence spectra from an individual aerosol particle of simulants for BWA upon excitation with a single nanosecond laser pulse. We demonstrate the successful detection and spectral characterization of simulants for BWA, i.e., Bacillus atrophaeus (BG), Bacillus thuringiensis (BT), and Ovalbumin (OA).
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| 25. |
- Jonsson, P., et al.
(författare)
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Spectral detection of ultraviolet laser induced fluorescence from individual bioaerosol particles
- 2006
-
Ingår i: Proceedings of SPIE, the International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. - 0819464961 - 9780819464965 ; 6398
-
Tidskriftsartikel (refereegranskat)abstract
- We present results of a measurement system designed for detecting the fluorescence spectrum of individual aerosol particles of biological warfare agents excited with laser pulses at wavelengths around 290 or 340 nm. The biological aerosol is prepared and directed into a narrow air beam. A red laser is focused on the aerosol beam and a trigger photomultiplier tube monitor the presence of individual particles by measuring the scattered light. When a particle is present in the detection volume, a laser pulse is triggered from an ultraviolet laser and the fluorescence spectrum is acquired with a spectrometer based on a diffraction grating and a 32 channels photomultiplier tube array with single-photon sensitivity. The spectrometer measures the fluorescence spectra in the wavelength region from 300 to 800 nm. In the experiment we used different simulants of biological warfare agents. These bioaerosol particles were excited by a commercial available gas laser (337 nm), or a laser (290 nm) that we have developed based on an optical parametric oscillator with intracavity sum-frequency mixing. In the analysis of the experiments we compare the measured signals (fluorescence spectra, total fluorescence energy and the scattered energy) from the individual bioaerosol particles excited with the two different ultraviolet wavelengths.
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| 26. |
- Leemann, Simon, et al.
(författare)
-
Beam dynamics and expected performance of Sweden's new storage-ring light source: MAX IV
- 2009
-
Ingår i: Physical Review Special Topics. Accelerators and Beams. - 1098-4402. ; 12:12, s. 1-120701
-
Tidskriftsartikel (refereegranskat)abstract
- MAX IV will be Sweden's next-generation high-performance synchrotron radiation source. The project has recently been granted funding and construction is scheduled to begin in 2010. User operation for a broad and international user community should commence in 2015. The facility is comprised of two storage rings optimized for different wavelength ranges, a linac-based short-pulse facility and a free-electron laser for the production of coherent radiation. The main radiation source of MAX IV will be a 528 m ultra-low emittance storage ring operated at 3 GeV for the generation of high-brightness hard X-rays. This storage ring was designed to meet the requirements of state-of-the-art insertion devices which will be installed in nineteen 5 m long dispersion-free straight sections. The storage ring is based on a novel multi-bend achromat design delivering an unprecedented horizontal bare lattice emittance of 0.33 nm rad and a vertical emittance below the 8 pm rad diffraction limit for 1 A radiation. In this paper we present the beam dynamics considerations behind this storage ring design and detail its expected unique performance.
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| 27. |
- Lind, Per, et al.
(författare)
-
Structural, photophysical, and nonlinear absorption properties of trans-di-arylalkynyl Platinum(II) Complexes with Phenyl and Thiophenyl Groups
- 2007
-
Ingår i: Journal of Physical Chemistry A. - : American Chemical Society (ACS). - 1089-5639 .- 1520-5215. ; 111:9, s. 1598-1609
-
Tidskriftsartikel (refereegranskat)abstract
- Optical power limiting and luminescence properties of two Pt(II) complexes with thiophenyl and phenyl groups in the ligands, trans-Pt(P(n-Bu)3)2(C[triple bond]C-Ar)2, where Ar = -C4H2S-C[triple bond]C-p-C6H4-n-C5H11 (1) and -p-C6H4-C[triple bond]C-C4H3S (2), have been investigated. The fluorescence lifetimes were found to be on the sub-nanosecond time scale, and the quantum yields were low, in accord with fast intersystem crossing from the excited singlet to triplet manifold. The phosphorescence lifetimes of 1 and 2 were shorter than that of a Pt(II) complex having two phenyl groups in the ligands. In order to elucidate the C-Pt bonding nature in the ground state, the 13C NMR chemical shift of the carbon directly bonded to Pt, the coupling constants 1JPtC, 2JPtC, and 1JPtP, and IR νC[triple bond]C wavenumbers were obtained for 1, 2, and three other trans-diarylalkynyl Pt(II) complexes. X-ray diffraction data of 1 and 2 and density functional theory calculated geometries of models of 1, 2, and trans-Pt(P(n-Bu)3)2(C[triple bond]C-p-C6H4-C[triple bond]C-C6H5)2 (3) show that 1 preferably exists in a different conformation from that of 2 and 3. The variations in photophysical, NMR, and IR data can be rationalized by differences in geometry and pi-backbonding from Pt to the alkynyl ligand.
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| 28. |
- Lindgren, Christofer, et al.
(författare)
-
Förfarande och anordning vid kontinuerlig kokning av kemisk cellulosamassa : Method and device for the continuous cooking of pulp
- 2005
-
Patent (populärvet., debatt m.m.)abstract
- The invention concerns an arrangement and a method for the continuous cooking of chemical cellulose pulp in a continuous digester system (100). The continuous digester system (100) comprises an inlet (102) for the feed of a chips suspension and an outlet (103) for the output of a cooked suspension of pulp. The suspension of chips is fed in to the inlet through a line (105) at the beginning of the cook, where the chips suspension has a volume of starting cooking fluid that establishes a fluid/wood ratio that is greater than 3.5. The invention is characterised in that a final cooking fluid is present during the cook for the major part of the cook and is withdrawn through a withdrawal strainer (106) only during the final 15 minutes of the cook. The final cooking fluid ensures a fluid/wood ratio that is greater than 3.5 in association with the withdrawal. The withdrawn final cooking fluid during the final 15 minutes of the cook consists of spent black liquor, which maintains a residual alkali level that lies under 15 g/l.
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| 29. |
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| 30. |
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| 31. |
- Lindgren, Johan, et al.
(författare)
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Halisaurus sternbergi, a small mosasaur with an intercontinental distribution
- 2005
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Ingår i: Journal of Paleontology. - 0022-3360. ; 79:4, s. 763-773
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Tidskriftsartikel (refereegranskat)abstract
- Remains of Halisaurus sternbergi (Wiman, 1920) from the latest Early Campanian (sensu germanico) of the Kristianstad Basin, southern Sweden, represent the first record of this species outside of the USA. The material comprises numerous marginal tooth-crowns, a premaxilla, an incomplete pterygoid, and vertebrae. The Kristianstad Basin population of H. sternbergi was probably derived from individuals that migrated from the Mississippi Embayment in North America sometime during the Early Campanian. Even though H. sternbergi thrived in great numbers in the coastal waters of the southern part of the Baltic Shield during the latest Early Campanian, the population appears to have been short-lived. Available data indicate that H. sternbergi, along with several other species of mosasaurs, vanished from the region following an intercontinental mosasaur extinction event, or a series of events, near the Early/Late Campanian boundary.
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| 32. |
- Lindgren, Johan, et al.
(författare)
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Theropod dinosaur teeth from the lowermost Cretaceous Rabekke Formation on Bornholm, Denmark
- 2008
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Ingår i: Geobios. - : Elsevier BV. - 0016-6995. ; 41:2, s. 253-262
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Tidskriftsartikel (refereegranskat)abstract
- The dinosaur fauna of the palynologically dated lower Berriasian Skyttegard Member of the Rabekke Formation on the Baltic island of Bornholm, Denmark, is represented by isolated tooth crowns. The assemblage is restricted to small maniraptoran theropods, assigned to the Dromaeosauridae incertae sedis and Maniraptora incertae sedis. The dromaeosaurid teeth are characterized by their labiolingually compressed and distally curved crowns that are each equipped with a lingually flexed mesial carina and a distinctly denticulated distal cutting edge. A morphologically aberrant tooth crown (referred to as Maniraptora incertae sedis) has triangular denticles of uneven width, a feature occasionally found in Upper Cretaceous hesperornithiform toothed diving birds, but also in premaxillary teeth of the velociraptorine Nuthetes from the Lower Cretaceous of England.
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| 33. |
- Lindgren, Lars-Erik, et al.
(författare)
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Machining simulations and their use in industry
- 2005
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Ingår i: VIII International Conference on Computational Plasticity. - : International Center for Numerical Methods in Engineering (CIMNE). ; , s. 335-338
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Konferensbidrag (refereegranskat)abstract
- Machining simulations is a challenge both with respect to demands on robust numerical methods as well as modelling issues. The paper outlines some of the challenges but also current use of simulations at Sandvik Coromant.
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| 34. |
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| 35. |
- Lindgren, Mikael, et al.
(författare)
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Detection and characterization of aggregates, prefibrillar amyloidogenic oligomers, and protofibrils using fluorescence spectroscopy
- 2005
-
Ingår i: Biophysical Journal. - : Elsevier BV. - 0006-3495 .- 1542-0086. ; 88:6, s. 4200-4212
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Tidskriftsartikel (refereegranskat)abstract
- Transthyretin (TTR) is a protein linked to a number of different amyloid diseases including senile systemic amyloidosis and familial amyloidotic polyneuropathy. The transient nature of oligomeric intermediates of misfolded TTR that later mature into fibrillar aggregates makes them hard to study, and methods to study these species are sparse. In this work we explore a novel pathway for generation of prefibrillar aggregates of TTR, which provides important insight into TTR misfolding. Prefibrillar amyloidogenic oligomers and protofibrils of misfolded TTR were generated in vitro through induction of the molten globule type A-state from acid unfolded TTR through the addition of NaCl. The aggregation process produced fairly monodisperse oligomers (300–500 kD) within 2 h that matured after 20 h into larger spherical clusters (30–50 nm in diameter) and protofibrils as shown by transmission electron microscopy. Further maturation of the aggregates showed shrinkage of the spheres as the fibrils grew in length, suggesting a conformational change of the spheres into more rigid structures. The structural and physicochemical characteristics of the aggregates were investigated using fluorescence, circular dichroism, chemical cross-linking, and transmission electron microscopy. The fluorescent dyes 1-anilinonaphthalene-8-sulfonate (ANS), 4-4-bis-1-phenylamino-8-naphthalene sulfonate (Bis-ANS), 4-(dicyanovinyl)-julolidine (DCVJ), and thioflavin T (ThT) were employed in both static and kinetic assays to characterize these oligomeric and protofibrillar states using both steady-state and time-resolved fluorescence techniques. DCVJ, a molecular rotor, was employed for the first time for studies of an amyloidogenic process and is shown useful for detection of the early steps of the oligomerization process. DCVJ bound to the early prefibrillar oligomers (300–500 kD) with an apparent dissociation constant of 1.6 mM, which was slightly better than for ThT (6.8 mM). Time-resolved fluorescence anisotropy decay of ANS was shown to be a useful tool for giving further structural and kinetic information of the oligomeric aggregates. ThT dramatically increases its fluorescence quantum yield when bound to amyloid fibrils; however, the mechanism behind this property is unknown. Data from this work suggest that unbound ThT is also intrinsically quenched and functions similarly to a molecular rotor, which in combination with its environmental dependence provides a blue shift to the characteristic 482nm wavelength when bound to amyloid fibrils.
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| 36. |
- Lindgren, Mikael, et al.
(författare)
-
Electronic states and phosphorescence of dendron functionalized platinum(II) acetylides
- 2007
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Ingår i: Journal of Luminescence. - : Elsevier BV. - 0022-2313 .- 1872-7883. ; 124:2, s. 302-310
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Tidskriftsartikel (refereegranskat)abstract
- The photophysical properties of bis((4-(phenylethynyl)phenyl)ethynyl)bis(tributylphosphine) platinum(II) with 2,2-bis(methylo])propionic acid (bis-MPA) dendritic substituents were studied. The fluorescence emission decay upon excitation in the UV (typically 350-380 nm) was rapid, in the order of I ns or shorter. In oxygen-saturated tetrahydrofuran solvent, the phosphorescence decay time was in the order of 200 ns. Bright phosphorescence at 530 nm was found for dendrimers under certain conditions. The associated phosphorescence decay time considerably increased to above 100-200 mu s at higher concentrations (30-100 mu M), and in oxygen-evacuated samples. Thus, it was clarified that the strongest triplet quenching was caused by oxygen dissolved in the sample, since it was possible to reversibly go between the bright and quenched phosphorescent state by freeze-thaw pumping cycles. The bright phosphorescence formed spontaneously for the cases with the larger dendritic substituents is implying a chromophore protecting effect. From time-dependent density functional calculations, the electronic structure of a few low-lying singlet and triplet states are discussed. A new mechanism for efficient triplet state formation and phosphorescence of Pt-ethynyls is proposed. Here, a fast relaxation via internal conversion takes the excited population of the dominant pi -> pi*, excitation into a lower singlet state of ligand-to-metal charge transfer character of pi sigma* type. This allows an efficient inter system crossing to the triplet state manifold.
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| 37. |
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| 38. |
- Malmaeus, Mikael, et al.
(författare)
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The optimal size of dynamic phosphorus models for baltic coastal areas
- 2008
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Ingår i: Ecological Modelling. - : Elsevier BV. - 0304-3800 .- 1872-7026. ; 216:3-4, s. 303-315
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Tidskriftsartikel (refereegranskat)abstract
- 6 models for phosphorus and chlorophyll of different complexity were applied in 11 Swedish coastal areas. The number of state variables varied between 1 in the simplest model to 7 in the most complex. The results were compared for total phosphorus and chlorophyll in surface water compartments. The results imply that for the studied water bodies, models containing separate state variables for phosphorus in surface water and deep water are superior to models treating the water column as a completely mixed entity. The results do not justify separation of phosphorus into dissolved and particulate fractions. Modeling chlorophyll as a separate state variable did not improve the results for individual values compared to a simple regression against total phosphorus in surface water. Unless detailed descriptions or predictions of chlorophyll dynamics are required, modeling eutrophication in coastal areas may thus be considered as a matter of total phosphorus in two water compartments plus sediments.
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| 39. |
- Minaev, Boris, et al.
(författare)
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Application of density functional theory for studies of excited states and phosphorescence of platinum(II) acetylides
- 2006
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 125:9, s. 094306-
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Tidskriftsartikel (refereegranskat)abstract
- The electronic states of different conformations of platinum acetylides Pt(PH3)(2)(C C-Ph)(2) and Pt(PH3)(2)(C C-PhC C-Ph)(2) (PE1 and PE2) were calculated with density functional theory (DFT) using effective core potential basis sets. Time dependent DFT calculations of UV absorption spectra showed strong dependence of the intense absorption band maxima on mutual orientation of the phenyl rings with respect to the P-Pt-P axis. Geometry optimization of the first excited triplet state (T-1) indicates broken symmetry structure with the excitation being localized in one ligand. This splits the two substitution ligands into a nondistorted aromatic ring with the C C-Ph bonds for one side and into a quinoid structure with a cumulenic C = C = C link on the other side. Quadratic response (QR) calculations of spin-orbit coupling and phosphorescence radiative lifetime (tau(R)) indicated a good agreement with experimental tau(R) values reported for solid PE1 and PE2 and PE2 capped with dendrimers in tetrahydrofuran solutions. The QR calculations reproduced an increase of tau(R) upon prolongation of pi chain of ligands and concommittant redshift of the phosphorescence. Moreover, it is shown how the phosphorescence borrows intensity from sigma ->pi(*) transitions localized at the C C-Pt-P fragments and that there is no intensity borrowing from delocalized pi ->pi(*) transitions.
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| 40. |
- Mohammed, Abdelsalam, et al.
(författare)
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Classification of Raman active modes of platinum(II) acetylides : A combined experimental and theoretical study
- 2009
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Ingår i: Chemical Physics Letters. - : Elsevier BV. - 0009-2614 .- 1873-4448. ; 481:4-6, s. 209-213
-
Tidskriftsartikel (refereegranskat)abstract
- Non-resonance Raman scattering of platinum(II) acetylide molecules is studied both by theory and experiment. Differential cross sections are presented for bis((4-(phenyl-ethynyl)phenyl)ethynyl)bis(tri-n-butylphosphine)platinum( II) (Pt1), and for bis((4-(phenyl-ethynyl) bis(tri-n-butylphosphine) platinum(II) substituted with triazole end group (Z1). All intense bands in the observed Raman scattering are assigned to symmetric vibrations of Pt-C C, C C, and phenyl groups; a reliable interpretation includes some details of relative intensities for the stretching and in-plane bending modes. The Raman spectra verify that the Pt-acetylide dyes remain intact during the material processing, indicating that they retain functionality for applications like in optical power limiting, nonlinear optics, and light emitting diodes.
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| 41. |
- Nilsson, K. Peter R., et al.
(författare)
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Imaging distinct conformational states of amyloid-beta fibrils in Alzheimer's disease using novel luminescent probes
- 2007
-
Ingår i: ACS Chemical Biology. - : American Chemical Society (ACS). - 1554-8929 .- 1554-8937. ; 2:8, s. 553-560
-
Tidskriftsartikel (refereegranskat)abstract
- Using luminescent conjugated polyelectrolyte probes (LCPs), we demonstrate the possibility to distinguish amyloid-β 1–42 peptide (Aβ1–42) fibril conformations, by analyzing in vitro generated amyloid fibrils of Aβ1–42 formed under quiescent and agitated conditions. LCPs were then shown to resolve such conformational heterogeneity of amyloid deposits in vivo. A diversity of amyloid deposits depending upon morphology and anatomic location was illustrated with LCPs in frozen ex vivo brain sections from a transgenic mouse model (tg-APP swe) of Alzheimer’s disease. Comparative LCP fluorescence showed that compact-core plaques of amyloid β precursor protein transgenic mice were composed of rigid dense amyloid. A more abundant form of amyloid plaque displayed morphology of a compact center with a protruding diffuse exterior. Surprisingly, the compact center of these plaques showed disordered conformations of the fibrils, and the exterior was composed of rigid amyloid protruding from the disordered center. This type of plaque appears to grow from more loosely assembled regions toward solidified amyloid tentacles. This work demonstrates how application of LCPs can prove helpful to monitor aggregate structure of in vivo formed amyloid deposits such as architecture, maturity, and origin.
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| 42. |
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| 43. |
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| 44. |
- Nilsson, Peter, et al.
(författare)
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Imaging distinct conformational states of amyloid-β fibrils in Alzheimer's disease using novel luminescent probes
- 2007
-
Ingår i: ACS Chemical Biology. - : American Chemical Society (ACS). - 1554-8929 .- 1554-8937. ; 2:8, s. 553-560
-
Tidskriftsartikel (refereegranskat)abstract
- Using luminescent conjugated polyelectrolyte probes (LCPs), we demonstrate the possibility to distinguish amyloid-β 1-42 peptide (Aβ1-42) fibril conformations, by analyzing in vitro generated amyloid fibrils of Aβ1-42 formed under quiescent and agitated conditions. LCPs were then shown to resolve such conformational heterogeneity of amyloid deposits in vivo. A diversity of amyloid deposits depending upon morphology and anatomic location was illustrated with LCPs in frozen ex vivo brain sections from a transgenic mouse model (tg-APPswe) of Alzheimer's disease. Comparative LCP fluorescence showed that compact-core plaques of amyloid β precursor protein transgenic mice were composed of rigid dense amyloid. A more abundant form of amyloid plaque displayed morphology of a compact center with a protruding diffuse exterior. Surprisingly, the compact center of these plaques showed disordered conformations of the fibrils, and the exterior was composed of rigid amyloid protruding from the disordered center. This type of plaque appears to grow from more loosely assembled regions toward solidified amyloid tentacles. This work demonstrates how application of LCPs can prove helpful to monitor aggregate structure of in vivo formed amyloid deposits such as architecture, maturity, and origin.
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| 45. |
- Nybacka, Mikael, et al.
(författare)
-
Project: CASTT - Centre for Automotive Systems Technologies and Testing
- 2007
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Annan publikation (populärvet., debatt m.m.)abstract
- Through the Centre for Automotive Systems Technologies and Testing, Luleå University of Technology aims to first of all support automotive winter testing in Northern Sweden. This means to support the local automotive test entrepreneurs and through them their customers: the car manufacturers and their suppliers. To succeed in this task, the center relies on the university's areas of leading research and most importantly on the cooperation between those areas.
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| 46. |
- Nybacka, Mikael, et al.
(författare)
-
Projekt: Intelligenta inlandsvägen
- 2009
-
Annan publikation (populärvet., debatt m.m.)abstract
- VISION Genom samverkan med initiativtagare runt TSS-konceptet skall projektet ha bidragit till att göra E45’an till en europeisk ”Test Route”. Infrastrukturen skall erbjuda testmöjligheter av fordon i en mix av 2G, 3G, WLAN, WIMAX, NMT 450, o.s.v. Projektet skall skapa ett tydligt partnerskap mellan regionens entreprenörsdrivna mindre företag och de stora aktörerna inom två av svensk industris kärnområden (fordonsindustrin och telekomindustrin). BAKGRUND Centrum för Distansöverbryggande Teknik, ”CDT”, och Centre for Automotive system technology and Testing, CASTT, vid Luleå Tekniska Universitet, har den 1/1 2008 startat upp mål2-projektet ”den Intelligenta Inlandsvägen”. Övergripande mål är dels ett heterogent nät i form av en demomiljö med flera typer av transmissionstekniker, dels ett antal utvecklingsprojekt, med sikte på att bygga kunskap, teknik och metod som stödjer den vintertestrelaterade verksamheten inom denna demomiljö. PROJEKTSTRATEGI Ett samarbete med näringslivet både regionalt och nationellt skall säkra att framtagna prototyper tar sig ut på markanden som produkter och tjänster. Kopplingar till nationella projekt inom fordonsindustrin, inte minst Test Site Sweden, säkrar att utvecklingsinsatserna leder till ett vidgat nätverk för aktörerna inom vintertestregionen.
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| 47. |
- Parola, Stephane, et al.
(författare)
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Hybrid materials for optical limiting applications
- 2006
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Ingår i: Optical Materials in Defence Systems Technology III. - Stockholm, Sweden : SPIE-INT SOC OPTICAL ENGINEERING. - 9780819464996 ; , s. U71-U78
-
Konferensbidrag (refereegranskat)abstract
- Optical limiting materials are developed for applications in protection of optical sensors against laser aggressions. We have studied functionalised macrocycles (thiacalixarenes) and alkynylplatinum(H) derivatives for optical limiting applications. Glass materials based on alkynylplatinum(H) derivatives and macrocycles were prepared through the sol-gel process. The molecular species were grafted to the matrix in order to maximise the concentration and the stability of the final solid-state material. The glass materials were cut and polished to approximately 1.5 mm. The glass materials show broadband optical limiting in the visible wavelength region, for nanosecond laser pulses.
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| 48. |
- Pudelko, Maciej, et al.
(författare)
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Formation of lactones from sialylated MUC1 glycopeptides
- 2006
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Ingår i: Organic and biomolecular chemistry. - : Royal Society of Chemistry (RSC). - 1477-0520 .- 1477-0539. ; 4:4, s. 713-20
-
Tidskriftsartikel (refereegranskat)abstract
- The tumor-associated carbohydrate antigens TN, T, sialyl TN and sialyl T are expressed on mucins in several epithelial cancers. This has stimulated studies directed towards development of glycopeptide-based anticancer vaccines. Formation of intramolecular lactones involving sialic acid residues and suitably positioned hydroxyl groups in neighboring saccharide moieties is known to occur for glycolipids such as gangliosides. It has been suggested that these lactones are more immunogenic and tumor-specific than their native counterparts and that they might find use as cancer vaccines. We have now investigated if lactonization also occurs for the sialyl TN and T antigens of mucins. It was found that the model compound sialyl T benzyl glycoside , and the glycopeptide Ala-Pro-Asp-Thr-Arg-Pro-Ala from the tandem repeat of the mucin MUC1, in which Thr stands for the 2,3-sialyl-T antigen, lactonized during treatment with glacial acetic acid. Compound gave the 1''--> 2' lactone as the major product and the corresponding 1''--> 4' lactone as the minor product. For glycopeptide the 1''--> 4' lactone constitued the major product, whereas the 1''--> 2' lactone was the minor one. When lactonized was dissolved in water the 1''--> 4' lactone underwent slow hydrolysis, whereas the 1''--> 2' remained stable even after a 30 days incubation. In contrast the corresponding 2,6-sialyl-TN glycopeptide did not lactonize in glacial acetic acid.
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| 49. |
- Roll, Mikael, et al.
(författare)
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Left-edge boundary tone and main clause verb effects on syntactic processing in embedded clauses - An ERP study
- 2009
-
Ingår i: Journal of Neurolinguistics. - : Elsevier BV. - 0911-6044. ; 22:1, s. 55-73
-
Tidskriftsartikel (refereegranskat)abstract
- We examined the effects of main clause verb pragmatics and left-edge boundary tones on syntactic processing in Swedish embedded clauses, using listener judgments and Event-Related Potentials. When the syntactic structure did not match the expectation based on the occurrence of a left-edge boundary tone, the acceptance rate decreased significantly, and a biphasic positive effect with an early peak (P345) and a late peak (P600) showed increased processing load. A larger continuous positive effect (P600) was obtained by changing an assertive main clause verb to a nonassertive verb, thereby modifying the lexical pragmatic context of the embedded clause. Increased positivity was also seen at the left-edge boundary tone when it mismatched a preceding nonassertive verb. We conclude that left-edge boundary tones are used in addition to verb pragmatics to guide the syntactic processing of embedded clauses in Swedish, and that pragmatic and prosodic information is integrated immediately.
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| 50. |
- Roll, Mikael, et al.
(författare)
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Neurophysiology of a left-edge boundary tone using natural and edited F0
- 2008
-
Ingår i: Proceedings Speech Prosody 2008. ; , s. 247-250
-
Konferensbidrag (refereegranskat)abstract
- The ERP effects of left-edge, sentence-medial boundary tones in East Swedish were examined using synthesized and non-synthesized F0. The perception of the boundary tone gave rise to an N100 effect, reflecting automated processing of the acoustic features of the stimuli, a broadly distributed P200 effect, similar to what has earlier been seen for sentence-initial pitch accents, and an expectancy negativity, previously observed in response to sentence-medial, expected pitch accents. The N100 effect was clear only for the synthesized stimuli, possibly due to their relatively greater salience. The P200 was only seen in the combined results. The expectancy negativity was present in the combined results as well as for the non-edited stimuli. The F0 synthesis in the environment of voiceless obstruents produced a difference in the F0 level before the disambiguation point of the H boundary tone, which led to an anterior negativity starting around 50 ms before the H.
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