| 1. |
- Andersson, Martin, et al.
(författare)
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A Reconfigurable Pipelined ADC in 0.18 um CMOS
- 2005
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Ingår i: 2005 Symposium on VLSI Circuits, Digest of Technical Papers. - 490078401X ; , s. 326-329
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Konferensbidrag (refereegranskat)abstract
- A reconfigurable pipelined A/D converter has been implemented in a 0.18 mu m RF-CMOS process. The ADC has eight configurations with a top performance of 10 bits resolution at 80 MSPS consuming 94mW. The reconfigurability is achieved by combining the cyclic and pipelined ADC architectures giving it a low level of complexity. In the conventional pipeline mode, the measured SFDR is 69 dBFS and the SNDR is 56.5 dBc for a 1.54 MHz single sinusoid tone input.
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| 2. |
- Aprodu, Iuliana, et al.
(författare)
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Advanced sample preparation for the molecular quantification of Staphylococcus aureus in artificially and naturally contaminated milk.
- 2011
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Ingår i: International Journal of Food Microbiology. - : Elsevier BV. - 0168-1605. ; 145, s. 61-65
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Tidskriftsartikel (refereegranskat)abstract
- Sample treatment is an essential element when using real-time PCR for quantification of pathogens directly on food samples. This study comparatively evaluated three different principles of sample treatment, i.e. immunomagnetic separation based on phage-derived cell wall binding molecules, matrix solubilization and flotation, in order to establish their suitability for quantifying low numbers of Staphylococcus aureus in milk. All three procedures succeeded to remove S. aureus from the milk matrix, either raw or pasteurized, and, as a result of the concentration of the target cells, minimized the effect of milk associated PCR inhibitors. Sample preparation based on immunomagnetic separation albeit of being user friendly, specific and rapid, failed to allow quantification of low and medium numbers (<10(4)CFU) of S. aureus. In a mastitic milk model cell wall binding domain (CBD)-based target cell extraction revealed results most closely matching those derived from culture-based quantification. Both matrix lysis and flotation allowed quantification of S. aureus at a level of 1-10 cells per ml. Both methods resulted in higher numbers of bacterial cell equivalents (bce) than plating could reveal. Since both methods harvest cells that have been subjected to either mechanical and chemical stresses before quantification, we concluded that the higher bce numbers resulted from a disaggregation of S. aureus clusters initially present in the inoculum. Conclusively, since likely each S. aureus cell of a toxigenic strain contributes to enterotoxin production, molecular quantification could provide an even more realistic impact assessment in outbreak investigations than plating does.
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| 3. |
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| 4. |
- Berge, John, 1979, et al.
(författare)
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Field and temperature dependent parameters of the dc field induced resonances in BaxSr1-xTiO3-based tunable thin film bulk acoustic resonators
- 2008
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 103:6, s. 064508-
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Tidskriftsartikel (refereegranskat)abstract
- Electrically tunable solidly mounted thin film bulk acoustic resonators based on Ba0.25 Sr0.75 Ti O3 and BaTi O3 films are fabricated and measured in wide dc bias voltage and temperature ranges. At room temperature, the tunability of the series and parallel resonances for the Ba0.25 Sr0.75 Ti O3 resonator are 1.7% and 0.3%, respectively, for 15 V bias voltage applied over the 350 nm thick ferroelectric film (43 Vμm). The electromechanical coupling coefficient increases with dc bias up to 3.7% at 15 V. The measured tunability and coupling coefficient are limited partly by the quality of the used films. Potentially, they may be substantially increased for high quality films allowing application of higher dc fields. The resonator quality factor is approximately 100. The measured resonator response is in good agreement with available models based on the electromechanical equations describing the ferroelectric film under applied dc and ac electric fields. Measurements of the resonance frequencies of the Ba0.25 Sr0.75 Ti O3 resonator as a function of temperature in the range 40-520 K reveal a sharp step at 150 K which is related to a structural phase transition of the ferroelectric material. The series resonance frequency is tuned to lower frequencies with increasing dc bias for all temperatures, while the parallel resonance frequency reveals a change in the sign of the tunability at approximately 150 K, from being tuned to lower frequencies at high temperatures to being tuned to higher frequencies at low temperatures. Measurements of BaTi O3 resonators in the temperature range 300-520 K are presented and compared to the Ba0.25 Sr0.75 Ti O3 results. © 2008 American Institute of Physics.
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| 5. |
- Berge, John, 1979, et al.
(författare)
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The effect of Bragg reflectors on the electromechanical performance of parallel-plate ferroelectric capacitors
- 2010
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Ingår i: IOP Conference Series: Materials Science and Engineering - Fundamentals and Technology of Multifunctional Oxide Thin Films (Symposium G, EMRS 2009 Spring Meeting) 8–12 June 2009, Strasbourg, France. - 1757-8981. ; 8:1, s. 012011-
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Konferensbidrag (refereegranskat)abstract
- Parallel-plate capacitors based on ferroelectric thin films are considered as high density capacitors and varactors. Due to the small thickness of the ferroelectric films, typically less than 1.0 mu m, high electric fields are generated even at relatively low voltages inducing piezoelectric effect associated with electrostriction. This induced piezoelectric effect has negative impact on ferroelectric capacitors since it causes extra loss (electroacoustic transformation of microwave energy). In this work the use of Bragg reflectors between the substrate and ferroelectric film is proposed as a possible way of suppression of the enhanced losses associated with the piezoelectric activity of the ferroelectric film.
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| 6. |
- Fransson, Martin, 1965-
(författare)
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Självbeskrivning och tjänstekognition : Om processkartläggning på Arbetsförmedlingen
- 2008
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- When duties are documented, new ideas are often created regarding how the work should be carried out. Writing is an important source of development, but unfortunately the possibilities are limited when it comes to transferring new ways of thinking to personnel. As with organizational change in general, employees tend to neglect new instructions. On the basis of their personal ways of thinking, they might find that the new order is incorrect, requires more resources, lacks contact with reality, or cannot be understood. The people who have prepared the new directives think they are surely justified and easy to understand. In their eyes, those who stick to what used to be correct and reasonable seem resistant to change. The aim of this dissertation is to understand the influence of self-assessment on service cognition and to propose how this influence can be utilized to attain strategic aims. The term self-assessment refers here to the activity whereby employees, in a structured manner, collectively assess and document their own instructions. The concept of service cognition refers to individual employee’s conceptions on how to carry out their own tasks, on how colleagues carry out theirs, and on connections between activities in the common workflow. The object of study is self-assessment as business process modeling at the local offices of the Swedish Employment Service. What is explored is the crass but fruitful understanding that new ways of thinking more easily arise among those who define organizational design than among those who are expected to change. Using socio-cognitive theory as well as longitudinal and extensive action research, the reasons are investigated behind the inevitable development of units which are trusted to write their own instructions and, in so doing, start to talk about the way work is done. Despite the independence needed to coordinate by consensus, it seems that the collective mind thereby induced actually enhances opportunities for central control and change: Units designing their own routines surely become better coordinated, but also more controllable and adaptive to strategic change. Furthermore, some principles are presented to support self-assessment regarding organization and change.
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| 7. |
- Fransson, Martin
(författare)
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Verkstadsindustrins tjänstefiering : en explorativ resa i det nya affärslandskapet
- 2004
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- I läroböcker och managementlitteratur hävdas att industrins erbjudanden får ett allt större tjänsteinnehåll. Kunskapen om hur denna ”tjänstefiering” tar sig uttryck är emellertid begränsad. I ett samarbete med Volvo Aero Corporation (VAC) i Trollhättan och SKF AB i Göteborg har Martin Fransson sökt och analyserat framgångsfall inom svensk verkstadsindustri. Teoretiskt kan rapporten positioneras till det fält som ges i överlappningen mellan industriell produktutveckling, tjänsteutveckling samt nätverkssamarbete och virtuella organisationer. Ett tydligt mönster är att verkstadsföretagen alltmer kombinerar hårdvara, mjukvara och tjänster till sk ”funktionella produkter”. Detta innebär en ändrad affärslogik med fokusförskjutning från den fysiska varans pris och egenskaper, till immateriella värden såsom tillgänglighet, användbarhet och driftsäkerhet. Ekonomisk potential uppstår då leverantörens hela kunskap om teknologins tillämpning blir tillgänglig fullt ut inne i kundens eget värdeskapande. Hårdvarans funktion under användningen blir i första hand en angelägenhet för leverantören och god kvalitet blir en fråga om förmåga till samproduktion. Priser sätts, inte utifrån levererade hårdvaru-, mjukvaru- eller tjänstedelar, utan utifrån användningstid, tillgänglighet, driftsäkerhet och utifrån bonus på kundens uppnådda resultat. Ser vi det hela ur ett organisatoriskt perspektiv innebär samproduktionen att leverantörer övertar konkreta arbetsuppgifter i kundens processer. Detta fordrar ett slags “interorganisatoriskt” ledarskap där innovationer gällande omorganisering skapas av ingenjörer som behärskar social och teknisk konstruktion, hos båda parter.
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| 8. |
- Gevorgian, Spartak, 1948, et al.
(författare)
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A voltage controlled switching device
- 2009
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- A capacitive device (100, 200) comprising first (110) and second (130) layers of electrically conductive material, each of which has a first and a second main surface. The device also comprises a third layer (120) of a paraelectric phase material between the first (110) and second (120) layers, so that one of said first or second surfaces of the first and second layers face the third layer. The device (100, 200) additionally comprises a non-conducting supporting structure (160) on which the device rests, and comprises means (DC) for applying a DC voltage across the third layer (160), so that the device by means of varying the applied DC voltage may be made to alter its electrical characteristics between that of a capacitor, a short circuit or an open circuit.
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| 9. |
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| 10. |
- Karlsson Lindsjö, Oskar, et al.
(författare)
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MetLab: An In Silico Experimental Design, Simulation and Analysis Tool for Viral Metagenomics Studies
- 2016
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Ingår i: PLoS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 11
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Tidskriftsartikel (refereegranskat)abstract
- Metagenomics, the sequence characterization of all genomes within a sample, is widely used as a virus discovery tool as well as a tool to study viral diversity of animals. Metagenomics can be considered to have three main steps; sample collection and preparation, sequencing and finally bioinformatics. Bioinformatic analysis of metagenomic datasets is in itself a complex process, involving few standardized methodologies, thereby hampering comparison of metagenomics studies between research groups. In this publication the new bioinformatics framework MetLab is presented, aimed at providing scientists with an integrated tool for experimental design and analysis of viral metagenomes. MetLab provides support in designing the metagenomics experiment by estimating the sequencing depth needed for the complete coverage of a species. This is achieved by applying a methodology to calculate the probability of coverage using an adaptation of Stevens' theorem. It also provides scientists with several pipelines aimed at simplifying the analysis of viral metagenomes, including; quality control, assembly and taxonomic binning. We also implement a tool for simulating metagenomics datasets from several sequencing platforms. The overall aim is to provide virologists with an easy to use tool for designing, simulating and analyzing viral metagenomes. The results presented here include a benchmark towards other existing software, with emphasis on detection of viruses as well as speed of applications. This is packaged, as comprehensive software, readily available for Linux and OSX users at https://github.com/norling/metlab.
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