| 1. |
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| 2. |
- Vorobiev, Andrei, 1963, et al.
(författare)
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Broadband microprobe characterization of the ferroelectric films and varactors
- 2006
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Ingår i: 36th European Microwave Conference, EuMC 2006; Manchester; United Kingdom; 10 September 2006 through 12 September 2006. - 2960055160 ; , s. 843-846
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Konferensbidrag (refereegranskat)abstract
- A simple method for the assessment of layout parasitics in the on-wafer microprobe characterization of the ferroelectric films and varactors is presented. The proposed method considers also the effect of the negative inductance associated with calibration procedure.
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| 3. |
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| 4. |
- Parishwad, Omkar, 1987, et al.
(författare)
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Investigating machine learning for simulating urban transport patterns: A comparison with traditional macro-models
- 2023
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Ingår i: Multimodal Transportation. - : Elsevier. - 2772-5863. ; 2:3
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Tidskriftsartikel (refereegranskat)abstract
- Predicting passenger flow within a city is crucial for intelligent transportation management systems, especially in the context of urban development, post-pandemic policy changes, and infrastructure improvements. Traditional macro models have limitations in accurately capturing the complex structure of real traffic flows, and recent advancements in machine learning offer promising approaches for improving transportation simulations. This research aims to compare the effectiveness of traditional simulation models with a selective machine learning (ML) model for traffic flow prediction in Oslo, Norway. Sensitivity and scenario analyses are conducted to examine the models’ parameters and derive the city’s characteristics. Results substantiate that the traditional Spatial Interaction model (SIM), although interpretable and requiring fewer parameters, has limitations in accurately capturing real flow structures and exhibits greater variability compared to the ML model. Statistical analyses support these findings and raise questions about the validity of the ML model’s results over the SIM. The research highlights the potential of ML models to identify trends in passenger flows and simulate traffic flows in different scenarios related to city development. Overall, the research presents a decision support system for planners and policymakers to predict traffic flow accurately and efficiently. It highlights the benefits and drawbacks of both the traditional SIM and ML models, contributing to the ongoing discussion of the role of machine learning in transportation modelling.
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| 5. |
- Hollberg, Alexander, 1985
(författare)
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Does a flipped classroom approach help? – Experiences from a project-based engineering course
- 2023
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Ingår i: Proceedings Chalmers Conference on Teaching and Learning 2023. - 9789188041548 ; , s. 24-31
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Konferensbidrag (refereegranskat)abstract
- Many project-based courses start with theoretical background lectures. However, the application of this knowledge in the students’ projects is often limited. This paper explores the research question: Does a flipped classroom approach improve the connection between theoretical lectures and the practical project? The method consists of converting four conventional lectures into a flipped classroom approach and posing surveys to the students. Furthermore, the teachers reflect on the outcomes in comparison to previous years. The results show that the exercises after the pre-recorded flipped lectures are appreciated by the students. However, the quality of their final project reports and observations during supervision meetings do not show clear results. As the project was carried out in 2021 during the pandemic, the results might be overshadowed by the impact of the remote teaching situation. Finally, the continued work on the flipped classroom approach led to high quality reports and improved course evaluations in 2023.
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| 6. |
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| 7. |
- Nguyen, Minh Vu Chuong, et al.
(författare)
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Quinone compounds regulate the level of ROS production by the NADPH oxidase Nox4
- 2013
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Ingår i: Biochemical Pharmacology. - : Elsevier. - 0006-2952 .- 1356-1839. ; 85:11, s. 1644-1654
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Tidskriftsartikel (refereegranskat)abstract
- NADPH oxidase Nox4 is expressed in a wide range of tissues and plays a role in cellular signaling by providing reactive oxygen species (ROS) as intracellular messengers. Nox4 oxidase activity is thought to be constitutive and regulated at the transcriptional level; however, we challenge this point of view and suggest that specific quinone derivatives could modulate this activity. In fact, we demonstrated a significant stimulation of Nox4 activity by 4 quinone derivatives (AA-861, tBuBHQ tBuBQ and duroquinone) observed in 3 different cellular models, HEK293E, T-REx (TM), and chondrocyte cell lines. Our results indicate that the effect is specific toward Nox4 versus Nox2. Furthermore, we showed that NAD(P)H:quinone oxidoreductase (NQO1) may participate in this stimulation. Interestingly, Nox4 activity is also stimulated by reducing agents that possibly act by reducing the disulfide bridge (Cys226, Cys270) located in the extracellular E-loop of Nox4. Such model of Nox4 activity regulation could provide new insight into the understanding of the molecular mechanism of the electron transfer through the enzyme, i.e., its potential redox regulation, and could also define new therapeutic targets in diseases in which quinones and Nox4 are implicated.
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| 8. |
- Razzaghpour, Milad, et al.
(författare)
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A Highly-Accurate Low-Power CMOS Potentiostat for Implantable BioSensors
- 2011
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Ingår i: Biomedical Circuits and Systems Conference (BioCAS), 2011 IEEE. - 9781457714696 ; , s. 5-8
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Konferensbidrag (refereegranskat)abstract
- Current-mirror-based potentiostats suffer from sys-tematic and random errors causing offset, gain and linearityerror in reading out the sensor data. In this work, a newpotentiostat topology is proposed to eliminate the systematicerror via an error-cancellation loop. The loop takes advantageof an error-tracking amplifier connected to a transimpedanceamplifier with adjustable input common-mode voltage. Due tothe enhanced loop gain, the potentiostat is able to accuratelycopy the sensor current which will then be converted into theproportional voltage. Additionally, a theoretical discussion ofthe proposed topology is given and a thorough study on theeffect of random error sources is carried out. The potentiostat isdesigned and simulated in a 150nm CMOS process. The resultsverify a highly-linear highly-accurate performance in a low-noisecondition, while consuming only 32 μW.
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| 9. |
- Zelenski, M., et al.
(författare)
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High emission rate of sulfuric acid from Bezymianny volcano, Kamchatka
- 2015
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Ingår i: Geophysical Research Letters. - 1944-8007 .- 0094-8276. ; 42:17, s. 7005-7013
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Tidskriftsartikel (refereegranskat)abstract
- High concentrations of primary sulfuric acid (H2SO4) in fumarolic gases and high emission rate of sulfuric acid aerosol in the plume were measured at Bezymianny volcano, an active dome-growing andesitic volcano in central Kamchatka. Using direct sampling, filter pack sampling, and differential optical absorption spectroscopy measurements, we estimated an average emission of H2SO4 at 243 ± 75 t/d in addition to an average SO2 emission of 212 ± 65 t/d. The fumarolic gases of Bezymianny correspond to arc gases released by several magma bodies at different stages of degassing and contain 25-92% of entrained air. H2SO4 accounts for 6-87 mol% of the total sulfur content, 42.8 mol% on average, and SO2 is the rest. The high H2SO4 in Bezymianny fumaroles can be explained by catalytic oxidation of SO2 inside the volcanic dome. Because sulfate aerosol is impossible to measure remotely, the total sulfur content in a plume containing significant H2SO4 may be seriously underestimated.
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| 10. |
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| 11. |
- Cottinet, M, et al.
(författare)
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Road information and road safety
- 1989
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Ingår i: Proceedings of Road Safety in Europe in Gothenburg, Sweden, October 12-14 1988. - Linköping : Statens väg- och transportforskningsinstitut. ; , s. 69-73
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 12. |
- Feiden, Gregory A.
(författare)
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Magnetic inhibition of convection and the fundamental properties of low-mass stars III. A consistent 10 Myr age for the Upper Scorpius OB association
- 2016
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 593
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Tidskriftsartikel (refereegranskat)abstract
- When determining absolute ages of identifiably young stellar populations, results strongly depend on which stars are studied. Cooler (K, M) stars typically yield ages that are systematically younger than warmer (A, F, G) stars by a factor of two. I explore the possibility that these age discrepancies are the result of magnetic inhibition of convection in cool young stars by using magnetic stellar evolution isochrones to determine the median age of the Upper Scorpius subgroup of the Scorpius-Centaurus OB association. A median age of 10 Myr consistent across spectral types A through M is found, except for a subset of F-type stars that appear significantly older. Agreement is shown for ages derived from the Hertzsprung-Russell (HR) diagram and from the empirical mass-radius relationship defined by eclipsing multiple-star systems. Surface magnetic field strengths required to produce agreement are approximately 2.5 kG and are predicted from a priori estimates of thermal equipartition values. A region in the HR diagram is identified that plausibly connects stars whose structures are weakly influenced by the presence of magnetic fields with those whose structures are strongly influenced by magnetic fields. The models suggest that this region is characterized by stars with rapidly thinning outer convective envelopes where the radiative core mass is greater than 75% of the total stellar mass. Furthermore, depletion of lithium predicted from magnetic models appears in better agreement with observed lithium equivalent widths than predictions from non-magnetic models. These results suggest that magnetic inhibition of convection plays an important role in the early evolution of low-mass stars and that it may be responsible for noted age discrepancies in young stellar populations.
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| 13. |
- van Dam, LF, et al.
(författare)
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Magnetic resonance imaging for diagnosis of recurrent ipsilateral deep vein thrombosis
- 2020
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Ingår i: Blood. - : American Society of Hematology. - 1528-0020 .- 0006-4971. ; 135:16, s. 1377-1385
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Tidskriftsartikel (refereegranskat)abstract
- The diagnosis of recurrent ipsilateral deep vein thrombosis (DVT) is challenging, because persistent intravascular abnormalities after previous DVT often hinder a diagnosis by compression ultrasonography. Magnetic resonance direct thrombus imaging (MRDTI), a technique without intravenous contrast and with a 10-minute acquisition time, has been shown to accurately distinguish acute recurrent DVT from chronic thrombotic remains. We have evaluated the safety of MRDTI as the sole test for excluding recurrent ipsilateral DVT. The Theia Study was a prospective, international, multicenter, diagnostic management study involving patients with clinically suspected acute recurrent ipsilateral DVT. Treatment of the patients was managed according to the result of the MRDTI, performed within 24 hours of study inclusion. The primary outcome was the 3-month incidence of venous thromboembolism (VTE) after a MRDTI negative for DVT. The secondary outcome was the interobserver agreement on the MRDTI readings. An independent committee adjudicated all end points. Three hundred five patients were included. The baseline prevalence of recurrent DVT was 38%; superficial thrombophlebitis was diagnosed in 4.6%. The primary outcome occurred in 2 of 119 (1.7%; 95% confidence interval [CI], 0.20-5.9) patients with MRDTI negative for DVT and thrombophlebitis, who were not treated with any anticoagulant during follow-up; neither of these recurrences was fatal. The incidence of recurrent VTE in all patients with MRDTI negative for DVT was 1.1% (95% CI, 0.13%-3.8%). The agreement between initial local and post hoc central reading of the MRDTI images was excellent (κ statistic, 0.91). The incidence of VTE recurrence after negative MRDTI was low, and MRDTI proved to be a feasible and reproducible diagnostic test. This trial was registered at www.clinicaltrials.gov as #NCT02262052.
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| 14. |
- Abolfathi, Bela, et al.
(författare)
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The Fourteenth Data Release of the Sloan Digital Sky Survey : First Spectroscopic Data from the Extended Baryon Oscillation Spectroscopic Survey and from the Second Phase of the Apache Point Observatory Galactic Evolution Experiment
- 2018
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Ingår i: Astrophysical Journal Supplement Series. - : IOP Publishing Ltd. - 0067-0049 .- 1538-4365. ; 235:2
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Tidskriftsartikel (refereegranskat)abstract
- The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since 2014 July. This paper describes the second data release from this phase, and the 14th from SDSS overall (making this Data Release Fourteen or DR14). This release makes the data taken by SDSS-IV in its first two years of operation (2014-2016 July) public. Like all previous SDSS releases, DR14 is cumulative, including the most recent reductions and calibrations of all data taken by SDSS since the first phase began operations in 2000. New in DR14 is the first public release of data from the extended Baryon Oscillation Spectroscopic Survey; the first data from the second phase of the Apache Point Observatory (APO) Galactic Evolution Experiment (APOGEE-2), including stellar parameter estimates from an innovative data-driven machine-learning algorithm known as "The Cannon"; and almost twice as many data cubes from the Mapping Nearby Galaxies at APO (MaNGA) survey as were in the previous release (N = 2812 in total). This paper describes the location and format of the publicly available data from the SDSS-IV surveys. We provide references to the important technical papers describing how these data have been taken (both targeting and observation details) and processed for scientific use. The SDSS web site (www.sdss.org) has been updated for this release and provides links to data downloads, as well as tutorials and examples of data use. SDSS-IV is planning to continue to collect astronomical data until 2020 and will be followed by SDSS-V.
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| 15. |
- Beecken, Jörg, 1982, et al.
(författare)
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Emission factors of SO2, NOx and particles from ships in Neva Bay from ground-based and helicopter-borne measurements and AIS-based modeling
- 2015
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Ingår i: Atmospheric Chemistry and Physics. - : Copernicus GmbH. - 1680-7316 .- 1680-7324. ; 15:9, s. 5229-5241
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Tidskriftsartikel (refereegranskat)abstract
- Emission factors of SO2, NOx and size-distributed particle numbers were measured for approximately 300 different ships in the Gulf of Finland and Neva Bay area during two campaigns in August/September 2011 and June/July 2012. The measurements were carried out from a harbor vessel and from an Mi-8 helicopter downwind of passing ships. Other measurements were carried out from shore sites near the island of Kronstadt and along the Neva River in the urban area of Saint Petersburg. Most ships were running at reduced speed (10 kn), i.e., not at their optimal load. Vessels for domestic and international shipping were monitored. It was seen that the distribution of the SO2 emission factors is bi-modal, with averages of 4.6 and 18.2 gSO(2) kg(fuel)(-1) for the lower and the higher mode, respectively. The emission factors show compliance with the 1% fuel sulfur content Sulfur Emission Control Areas (SECA) limit for 90% of the vessels in 2011 and 97% in 2012. The distribution of the NOx emission factor is mono-modal, with an average of 58 gNO(x) kg(fuel)(-1). The corresponding emission related to the generated power yields an average of 12.1 gNO(x) kWh(-1). The distribution of the emission factors for particulate number shows that nearly 90% of all particles in the 5.6 nm to 10 mu m size range were below 70 nm in diameter. The distribution of the corresponding emission factors for the mass indicates two separated main modes, one for particles between 30 and 300 nm and the other for above 2 mu m. The average particle emission factors were found to be in the range from 0.7 to 2.7 x 10(16) particles kg(fuel)(-1) and 0.2 to 3.4 gPM kg(fuel)(-1), respectively. The NOx and particulate emissions are comparable with other studies. The measured emission factors were compared, for individual ships, to modeled ones using the Ship Traffic Emission Assessment Model (STEAM) of the Finnish Meteorological Institute. A reasonably good agreement for gaseous sulfur and nitrogen emissions can be seen for ships in international traffic, but significant deviations are found for inland vessels. Regarding particulate mass, the values of the modeled data are about 2-3 times higher than the measured results, which probably reflects the assumptions made in the modeled fuel sulfur content. The sulfur contents in the fuel retrieved from the measurements were lower than the previously used assumptions by the City of Saint Petersburg when carrying out atmospheric modeling, and using these measurements it was possible to better assess the impact of shipping on air quality.
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| 16. |
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| 17. |
- Josephson, Per-Erik, 1960, et al.
(författare)
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Non value-adding costs in building projects: the missing thoughts
- 2002
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Ingår i: Proceedings of First International Conference on Construction in the 21st Century: Challenges and Opportunities in Management and Technology, Miami, Florida, USA, 25-26 April 2002. ; , s. 17-24
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Konferensbidrag (refereegranskat)
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| 18. |
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| 19. |
- Tjörnhammar, Staffan, 1980-, et al.
(författare)
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Iterative numerical investigation of the thermal dephasing process in second harmonic generation in bulk periodically-poled crystals
- 2014
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Ingår i: 6th EPS-QEOD Europhoton Conference, "Solid State, Fibre, and Waveguide Coherent Light Sources". - 2914771894 ; , s. 39-39
-
Konferensbidrag (refereegranskat)abstract
- We numerically study the detrimental effect of thermal dephasing during second-harmonic generation in quasi-phase matched materials by iteratively solving the coupled wave eqations and the heat transfer equation.The variation of different experimental conditions, such as external phase-match temperature and focussing conditions is discussed.
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| 20. |
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| 21. |
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| 22. |
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| 23. |
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| 24. |
- Beeching, Nick J., et al.
(författare)
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Training and assessment of medical specialists in clinical microbiology and infectious diseases in Europe
- 2021
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Ingår i: Clinical Microbiology and Infection. - : Elsevier. - 1198-743X .- 1469-0691. ; 27:11, s. 1581-1588
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Forskningsöversikt (refereegranskat)abstract
- Background: There is wide variation in the availability and training of specialists in the diagnosis and management of infections across Europe. Objectives: To describe and reflect on the current objectives, structure and content of European curricula and examinations for the training and assessment of medical specialists in Clinical (Medical) Microbiology (CM/MM) and Infectious Diseases (ID). Sources: Narrative review of developments over the past two decades and related policy documents and scientific literature. Content: Responsibility for curricula and examinations lies with the European Union of Medical Specialists (UEMS). The ID Section of UEMS was inaugurated in 1997 and the MM Section separated from Laboratory Medicine in 2008. The sections collaborate closely with each other and the European Society of Clinical Microbiology and Infectious Diseases (ESCMID). Updated European Training Requirements (ETR) were approved for MM in 2017 and ID in 2018. These comprehensive curricula outline the framework for delivery of specialist training and quality control for trainers and training programmes, emphasizing the need for documented, regular formative reviews of progress of trainees. Competencies to be achieved include both specialty-related and generic knowledge, skills and professional behaviours. The indicative length of training is typically 5 years; a year of clinical training is mandated for CM/MM trainees and 6 months of microbiology laboratory training for ID trainees. Each Section is developing examinations using multiple choice questions to test the knowledge base defined in their ETR, to be delivered in 2022 following pilot examinations in 2021. Implications: The revised ETRs and European examinations for medical specialists in CM/MM and ID provide benchmarks for national authorities to adapt or adopt locally. Through harmonization of postgraduate training and assessment, they support the promotion and recognition of high standards of clinical practice and hence improved care for patients throughout Europe, and improved mobility of trainees and specialists. Nick J. Beeching, Clin Microbiol Infect 2021;27:1581 (c) 2021 The Author(s). Published by Elsevier Ltd on behalf of European Society of Clinical Microbiology and Infectious Diseases. This is an open access article under the CC BY license (http://creativecommons. org/licenses/by/4.0/).
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| 25. |
- Birnbaum, Simon, 1977-
(författare)
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Inkomst utan arbete
- 2024
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Ingår i: Forskning & framsteg. - Stockholm : Forskning & framsteg. - 0015-7937. ; :5, s. 32-37
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- När AI tar över allt fler arbetsuppgifter har idén om basinkomst väckts till liv. Det finns experiment som visar att en ovillkorad grundinkomst från staten får människor att må bättre – och jobba mer, skriver statsvetaren Simon Birnbaum.
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| 26. |
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| 27. |
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| 28. |
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| 29. |
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| 30. |
- Silvervarg (Camara), Karin, et al.
(författare)
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A Visual Query Language for Uncertain Spatial and Temporal data
- 2005
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Ingår i: Proceedings of the Conference on Visual Information systems 2005. - Berlin/Heidelberg : Springer. - 9783540304883 ; , s. 163-176
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Query languages for sensor data will have similarities with traditional query languages but will also have diverging properties that cause a higher complexity than the traditional ones. Both types require data independence. However, as different sensors create data of heterogeneous type the commonly used methods for data selection cannot be used. Furthermore, sensor data will always be associated with uncertainties and since also sensor data fusion must be possible to carry out this cause further problem in development of the query languages. Here a visual query language for sensor data input is discussed from these perspectives to allow a complete set of spatial temporal queries by means of its visual user interface.
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| 31. |
- Vinberg, Stig, 1954-
(författare)
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Sickness presence among Swedish female and male managers
- 2019
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Ingår i: Working for the greater good. ; , s. 643-644
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Konferensbidrag (refereegranskat)abstract
- Purpose: The study investigates sickness presence, health and work-related factors among female and male managers in Swedish public and private organizations. Research indicate that managers have demanding and conflicting psychosocial working conditions and low replace ability,which may contribute to ill health and high sickness presence. Design/Methodology: The data consists of questionnaire answers from 1173 managers (50% women, 50% men) at different Swedish workplaces. The data makes it possible to compare managers at public and private workplaces and different workplace sizes. Results: The managers express high job satisfaction – 86% of public sector managers and 78% of private sector managers. However, 78% of male managers and 81% of female mangers report sickness presence with different time lengths. In addition, the results indicate differences in sickness presence related to manager positions and workplace sizes. Limitations: The study used self-assessments in a cross-sectional design, which does not allow for causal analyses. However, the data covers different workplaces in different Swedish regions. Research/Practical Implications: In politically ruled public sector organizations, the lack of clarity surrounding a manager’s role,responsibility, and decision latitude may create conflicting demands that contribute to highlevels of job strain and stress. Based on these facts, it is of relevance to contribute to knowledge about differences concerning sickness presence among different manager groups. Based on the results, practical implications at a societal and organizational level will be presented. Originality/Value: This research focus is of importance due to that research shows relations between managersand employees health and working conditions.
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| 32. |
- Wang, Ying, et al.
(författare)
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A multimodal electrochemical approach to measure the effect of zinc on vesicular content and exocytosis in a single cell model of ischemia
- 2021
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Ingår i: QRB Discovery. - : Cambridge University Press (CUP). - 2633-2892. ; 2
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Tidskriftsartikel (refereegranskat)abstract
- Zinc ion is essential for normal brain function that modulates synaptic activity and neuronal plasticity and it is associated with memory formation. Zinc is considered to be a contributing factor to the pathogenesis of ischemia, but the association between zinc and ischemia on vesicular exocytosis is unclear. In this study, we used a combination of chemical analysis methods and a cell model of ischemia/reperfusion to investigate exocytotic release and vesicular content, as well as the effect of zinc alteration on vesicular exocytosis. Oxygen-glucose deprivation and reperfusion (OGDR) was used as an in vitro model of ischemia in a model cell line. Exocytotic release and vesicular storage of catecholamine content were increased following OGDR, resulting in a higher fraction of release during exocytosis. However, zinc eliminated these increases following OGDR and the fraction of release remained unchanged. Understanding the consequences of zinc accumulation on vesicular exocytosis at the early stage of OGDR should aid in the development of therapeutic strategies to reduce ischemic brain injury. As the fraction released has been suggested to be related to presynaptic plasticity, insights are gained towards deciphering ischemia related memory impairment. ©
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