19 results on '"Schreiter L"'
Search Results
2. System Integration of ATLAS ITK Pixel DCS ASICs
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Qamesh, A., Ahmad, R., Ecker, D., Fischer, T., Karagounis, M., Kind, P., Kersten, S., Krawutschke, T., Schreiter, L., and Zeitnitz, C.
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Physics - Instrumentation and Detectors ,High Energy Physics - Experiment - Abstract
During the ATLAS phase II upgrade, the tracking system of the ATLAS experiment will be replaced by an all-silicon detector called the inner tracker (ITK) with a pixel detector as the most inner part. The monitoring data of the new system will be aggregated from an on-detector ASIC called Monitoring Of Pixel System (MOPS) and sent to the Detector Control System(DCS) using a new interface called MOPS-HUB. The hardware components of the MOPS-HUB, firmware specifications for the FPGA of MOPS-HUB and its integration plan will be presented. In addition, an irradiation plan for the new system will be introduced.
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- 2022
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3. An Empirical Model of the Occurrence Rate of Low Latitude Post‐Sunset Plasma Irregularities Derived From CHAMP and Swarm Magnetic Observations.
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Stolle, C., Siddiqui, T. A., Schreiter, L., Das, S. K., Rusch, I., Rother, M., and Doornbos, E.
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MAGNETIC field measurements ,IONOSPHERIC plasma ,SOLAR activity ,RADIO waves ,LATITUDE - Abstract
The prediction of post‐sunset equatorial plasma depletions (EPDs), often called ionospheric plasma bubbles, has remained a challenge for decades. In this study, we introduce the Ionospheric Bubble Probability (IBP) model, an empirical model to predict the occurrence probability of EPDs derived from 9 years of CHAMP and 9 years of Swarm magnetic field measurements. The model predicts the occurrence probability of EPDs for a given longitude, day of year, local time and solar activity, for the altitude range of about 350–510 km, and low geographic latitudes of ±45°. IBP has been found to successfully reconstruct the distribution of EPDs as reported in previous studies from independent data. IBP has been further evaluated using 1‐year of untrained data of the Ionospheric Bubble Index (IBI). IBI is a Level 2 product of the Swarm satellite mission used for EPD identification. The relative operating characteristics (ROC) curve shows positive excursion above the no‐skill line with Hanssen and Kuiper's Discriminant (H&KSS) score of 0.52, 0.51, and 0.55 at threshold model output of 0.16 for Swarm A, B, and C satellites. Additionally, the reliability plots show proximity to the diagonal line with a decent Brier Skill Score (BSS) of 0.249, 0.210, and 0.267 for Swarm A, B, and C respectively at 15% climatological occurrence rate. These tests indicate that the model performs significantly better than a no‐skill forecast. The IBP model offers compelling glimpses into the future of EPD forecasting, thus demonstrating its potential to reliably predict EPD occurrences. The IBP model is publicly available. Plain Language Summary: Post‐sunset equatorial plasma depletions (EPDs), often called ionospheric plasma bubbles, are a severe threat for reliable radio wave communication. However, their predictability has remained a challenge for the scientific community for decades. In this study, we introduce the Ionospheric Bubble Probability (IBP) model predicting the occurrence probability of post‐sunset EPDs for a given longitude, day of year, local time and solar activity, for the altitude range of about 350–510 km, and low geographic latitudes of ±45°. To this aim we have used 9 years of CHAMP and 9 years of Swarm magnetic field measurements. The IBP model predictions have been found to agree well with climatologies derived from independent data and performs largely better than unskilled forecasts. The IBP model is made publicly available. Key Points: The Ionospheric Bubble Probability (IBP) model estimates the occurrence probability of post‐sunset equatorial plasma depletions (EPDs)IBP shows high performance in predicting EPD occurrence for longitude, local time, day of year, solar activity, at altitudes of about 350–510 kmThe IBP model is publicly made available with documentation [ABSTRACT FROM AUTHOR]
- Published
- 2024
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4. System integration of ATLAS ITK Pixel DCS ASICs
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Qamesh, A., primary, Ahmad, R., additional, Ecker, D., additional, Fischer, T., additional, Karagounis, M., additional, Kind, P., additional, Kersten, S., additional, Krawutschke, T., additional, Schreiter, L., additional, and Zeitnitz, C., additional
- Published
- 2023
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5. L2 bandwidth correction for the Swarm Satellites
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Schreiter, L., Montenbruck, O., Zangerl, F., Siemes, C., Arnold, D., and Jäggi, A.
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520 Astronomy - Published
- 2021
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6. Combining Swarm, GRACE-FO and Sentinel for topside electron density estimation
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Schreiter, L., Stolle, C., Arnold, D., and Jäggi, A.
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520 Astronomy - Published
- 2020
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7. Reprocessing of GOCE Precise Science Orbits
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Arnold, D., Grombein, T., Schreiter, L., Sterken, V., and Jäggi, A.
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520 Astronomy - Published
- 2019
8. Total Electron Content (TEC) and the Rate Of change of TEC Index (ROTI) derived from ESA’s Low Earth Orbit (LEO) mission observations
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Kervalishvili, G., Xiong, C., Rauberg, J., Stolle, C., van den IJssel, J., and Schreiter, L.
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The LEO (Low Earth Orbit) satellite-based TEC (Total Electron Content) and ROTI (Rate Of change of TEC Index) are highly relevant for users in navigation and communications in view of strong plasma gradients causing GPS signal degradation and can lead to the losses of the signal. ESA’s Swarm constellation mission, consisting of three identical satellites, was launched on 22 November 2013. Among other instruments, each Swarm satellite carries a dual frequency GPS (Global Positioning System) Receiver (GPSR), which can be used to derive TEC and ROTI data. Swarm ROTI is defined as a standard deviation of Rate Of change of TEC (ROT) and it describes the small-scale variability of the line of sight electron content resulting from the ionosphere and plasmasphere. We present the climatology of TEC and ROTI using 5 years of Swarm constellation mission observations and investigate the seasonal and local time dependence at high and low latitudes. Also, the newly derived TEC and ROTI products for the ESA’s GOCE (Gravity Field and Steady-State Ocean Circulation Explorer) mission, which flew from 2009 to 2013 at approximately 270 km altitude, are presented. We compare GOCE results to the Swarm observations for the same local times and seasons, taking into account similar solar conditions. Contrary to the Swarm satellite data, GOCE TEC observations contain a considerable part of the F region electron density. The comparison between both data sets enables the estimation of the electron content variation in the upper atmosphere.
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- 2019
9. Characterization and modelling of low latitude plasma depletions by means of the magnetic field
- Author
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Stolle, C., Rodríguez-Zuluaga, J., Schreiter, L., Rother, M., Xiong, C., and Kervalishvili, G.
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Physics::Space Physics ,Physics::Geophysics - Abstract
Post sunset equatorial ionospheric plasma irregularities are a unique study case to investigate ion-neutral coupling in the low-latitude ionosphere, additionally, they are known to disturb radio wave communication. We use high precision magnetometer data from 10 years of CHAMP (2000-2010) and the recent the Swarm (2013-today) LEO missions high precision magnetometer data to derive a global model of their occurrence rate in the F region ionosphere (300-500km). The model is derived by appropriate functions, e.g., parameterizing season, longitude, solar flux, local time and persistence to describe the significant probability distribution. The model shows very good agreement to earlier climatological investigations based on other satellite missions. Identification of the plasma irregularities is through correlation between the high resolution insitu magnetic and electron density time series. This relation tells about ionospheric pressure-gradient electric currents. We find a typical global distribution of positive and negative correlation values opening new questions on processes of local ionospheric energy balance.
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- 2019
10. High-Resolution Near-Surface Velocity Model for Depth Imaging of Mineral Deposits in the Ludvika Mining Area, Sweden
- Author
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Schreiter, L., primary, Buske, S., additional, Malehmir, A., additional, Bäckström, E., additional, Schön, M., additional, and Marsden, P., additional
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- 2018
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11. Effects of Seismic Anisotropy on Target Depth Determination in Geothermal Exploration
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Köhn, D., primary, Jusri, T., additional, Rabbel, W., additional, Motra, H.B., additional, Schreiter, L., additional, Thorwart, M., additional, De Nil, D., additional, Wuttke, F., additional, and Buske, S., additional
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- 2018
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12. Situation detection for an interactive assistance in surgical interventions based on random forests
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Schreiter, L., Philipp, P., Giehl, J., Fischer, Yvonne, Raczkowsky, J., Schwarz, M., Beyerer, Jürgen, Wörn, H., and Publica
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surgical/interventional workflow modelling & management - Published
- 2016
13. Regulatory T cell frequencies are increased in preterm infants with clinical early-onset sepsis
- Author
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Pagel, J, primary, Hartz, A, additional, Figge, J, additional, Gille, C, additional, Eschweiler, S, additional, Petersen, K, additional, Schreiter, L, additional, Hammer, J, additional, Karsten, C M, additional, Friedrich, D, additional, Herting, E, additional, Göpel, W, additional, Rupp, J, additional, and Härtel, C, additional
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- 2016
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14. Counselling with a focus on product and price transparency for over-the-counter headache medicines: A simulated patient study in community pharmacies in Munich, Germany.
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Langer B, Kunow C, Bolduan J, Sackmann L, Schreiter L, Schüler K, and Ulrich M
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- Humans, Germany, Cross-Sectional Studies, Female, Adult, Male, Middle Aged, Young Adult, Pharmacies economics, Nonprescription Drugs economics, Patient Simulation, Community Pharmacy Services economics, Counseling, Headache drug therapy
- Abstract
Background: In Germany, over-the-counter (OTC) medicines may only be dispensed by community pharmacies (CPs). German CPs must ensure 'adequate' counselling, including the cost of medicines. Along with information gathering and advice giving as classic aspects of counselling, the aim was also to investigate counselling indicators of product and price transparency., Methods: The cross-sectional study was based on the covert simulated patient (SP) methodology and was conducted in a random sample of CPs stratified by districts in the major German city of Munich. Each of the 178 selected CPs was visited once by one of five trained female students. They simulated a symptom-based sub-scenario 1 with a request for an OTC medicine for a headache and a sub-scenario 2 with standardised information regarding product and price transparency. The assessment, completed immediately postvisit by the SPs, included a total of 23 items., Results: All 178 scheduled visits were completed successfully. The median counselling score with the classic items was 3.0 out of 12 points (interquartile range [IQR] 4.25) and when expanded by items for product and price transparency the score was 4.0 out of 14 points (IQR 4.00). A selection of medicines was offered unsolicited in 38.2% of the visits and in 5.6% of the visits voluntary price information was provided before the transaction. A request for a cheaper medicine led to a significant price reduction (Wilcoxon signed-rank test; p < 0.001, r = 0.869)., Conclusion: Due to the below-average level of counselling, the regional chambers of pharmacists are recommended to initiate measures for improvement. There is also potential for optimisation with regard to product and price transparency as an important extension of the classic counselling aspects. It is therefore recommended that the government raise customers' awareness of the cost of medicines., (© 2024 The Author(s). The International Journal of Health Planning and Management published by John Wiley & Sons Ltd.)
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- 2024
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15. Reprocessed precise science orbits and gravity field recovery for the entire GOCE mission.
- Author
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Arnold D, Grombein T, Schreiter L, Sterken V, and Jäggi A
- Abstract
ESA's Gravity field and steady-state Ocean Circulation Explorer (GOCE) orbited the Earth between 2009 and 2013 for the determination of the static part of Earth's gravity field. The GPS-derived precise science orbits (PSOs) were operationally generated by the Astronomical Institute of the University of Bern (AIUB). Due to a significantly improved understanding of remaining artifacts after the end of the GOCE mission (especially in the GOCE gradiometry data), ESA initiated a reprocessing of the entire GOCE Level 1b data in 2018. In this framework, AIUB was commissioned to recompute the GOCE reduced-dynamic and kinematic PSOs. In this paper, we report on the employed precise orbit determination methods, with a focus on measures undertaken to mitigate ionosphere-induced artifacts in the kinematic orbits and thereof derived gravity field models. With respect to the PSOs computed during the operational phase of GOCE, the reprocessed PSOs show in average a 8-9% better consistency with GPS data, 31% smaller 3-dimensional reduced-dynamic orbit overlaps, an 8% better 3-dimensional consistency between reduced-dynamic and kinematic orbits, and a 3-7% reduction of satellite laser ranging residuals. In the second part of the paper, we present results from GPS-based gravity field determinations that highlight the strong benefit of the GOCE reprocessed kinematic PSOs. Due to the applied data weighting strategy, a substantially improved quality of gravity field coefficients between degree 10 and 40 is achieved, corresponding to a remarkable reduction of ionosphere-induced artifacts along the geomagnetic equator. For a static gravity field solution covering the entire mission period, geoid height differences with respect to a superior inter-satellite ranging solution are markedly reduced (43% in terms of global RMS, compared to previous GOCE GPS-based gravity fields). Furthermore, we demonstrate that the reprocessed GOCE PSOs allow to recover long-wavelength time-variable gravity field signals (up to degree 10), comparable to information derived from GPS data of dedicated satellite missions. To this end, it is essential to take into account the GOCE common-mode accelerometer data in the gravity field recovery., Competing Interests: Conflict of interestThe authors declare no conflict of interest., (© The Author(s) 2023.)
- Published
- 2023
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16. Bandwidth correction of Swarm GPS carrier phase observations for improved orbit and gravity field determination.
- Author
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Schreiter L, Montenbruck O, Zangerl F, Siemes C, Arnold D, and Jäggi A
- Abstract
Gravity fields derived from GPS tracking of the three Swarm satellites have shown artifacts near the geomagnetic equator, where the carrier phase tracking on the L2 frequency is unable to follow rapid ionospheric path delay changes due to a limited tracking loop bandwidth of only 0.25 Hz in the early years of the mission. Based on the knowledge of the loop filter design, an analytical approach is developed to recover the original L2 signal from the observed carrier phase through inversion of the loop transfer function. Precise orbit determination and gravity field solutions are used to assess the quality of the correction. We show that the a posteriori RMS of the ionosphere-free GPS phase observations for a reduced-dynamic orbit determination can be reduced from 3 to 2 mm while keeping up to 7% more data in the outlier screening compared to uncorrected observations. We also show that artifacts in the kinematic orbit and gravity field solution near the geomagnetic equator can be substantially reduced. The analytical correction is able to mitigate the equatorial artifacts. However, the analytical correction is not as successful compared to the down-weighting of problematic GPS data used in earlier studies. In contrast to the weighting approaches, up to 9-10% more kinematic positions can be retained for the heavily disturbed month March 2015 and also stronger signals for gravity field estimation in the equatorial regions are obtained, as can be seen in the reduced error degree variances of the gravity field estimation. The presented approach may also be applied to other low earth orbit missions, provided that the GPS receivers offer a sufficiently high data rate compared to the tracking loop bandwidth, and provided that the basic loop-filter parameters are known., (© The Author(s) 2021.)
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- 2021
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17. Mannose-binding lectin and mannose-binding protein-associated serine protease 2 levels and infection in very-low-birth-weight infants.
- Author
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Hartz A, Schreiter L, Pagel J, Moser K, Wieg C, Grotheer A, Rupp J, Herting E, Göpel W, and Härtel C
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- Birth Weight, Exons, Female, Genetic Predisposition to Disease, Genotype, Gestational Age, Humans, Infant, Newborn, Male, Mannose-Binding Lectin genetics, Mannose-Binding Protein-Associated Serine Proteases genetics, Polymorphism, Genetic, Polymorphism, Single Nucleotide, Premature Birth, Prospective Studies, Sepsis genetics, Infant, Very Low Birth Weight, Mannose-Binding Lectin blood, Mannose-Binding Protein-Associated Serine Proteases analysis, Sepsis blood
- Abstract
Objective: The aim of this study was to explore the role of the lectin pathway in neonatal sepsis through the study of MBL and MASP2 levels and their relationship with infection in a cohort of very-low-birth-weight infants (VLBWI)., Methods: MBL and MASP2 were measured in plasma samples of n = 89 VLBWI using ELISA and correlated with clinical parameters. MBL plasma levels were aligned with genotyping data of mbl2 exon 1 polymorphisms, rs1800450, rs1800451, and rs5030737., Results: MBL levels were clearly determined by MBL genotype, i.e., AA individuals had tenfold higher MBL levels than AO individuals. MBL and MASP2 levels did not correlate with gestational age, apart from MASP2 levels on day 7. During the first 21 days of life, we noted a gradual increase in both MBL and MASP2 levels. On day 7 of life, MASP2 levels in infants developing late-onset sepsis measured before the onset of symptoms were found to be lower, as compared to non-LOS infants., Conclusions: In our cohort of VLBWI, MBL levels were genetically determined, but not associated with gestational age or sepsis in the first 21 days of life. Lower MASP2 levels on day 7 may indicate increased risk for late-onset infection.
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- 2018
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18. The association of mannose-binding lectin 2 polymorphisms with outcome in very low birth weight infants.
- Author
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Hartz A, Pagel J, Humberg A, Preuss M, Schreiter L, Rupp J, Figge J, Karsten CM, Nürnberg P, Herting E, Göpel W, and Härtel C
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- Cohort Studies, Humans, Infant, Newborn, Infections complications, Mannose-Binding Lectin deficiency, Mannose-Binding Lectin genetics, Metabolism, Inborn Errors complications, Metabolism, Inborn Errors genetics, Infant, Very Low Birth Weight, Mannose-Binding Lectins genetics, Polymorphism, Genetic
- Abstract
Objectives: Studies on the influence of mannose-binding lectin (MBL) deficiency on infection susceptibility in preterm infants have yielded controversial results. We investigated the association of genotype-based MBL levels with outcome in very-low-birth weight infants (VLBWI)., Methods: We genotyped 3 genetic variants of MBL2 (rs1800450, rs1800451, rs5030737) in 6878 VLBWI. MBL plasma levels were categorized as normal (wild type, A/A), low (heterozygotes, A/O) or undetectable (homozygotes, O/O). Primary outcome was the effect of genotype-based MBL2 levels on blood-culture proven and clinical sepsis during primary stay in hospital. We also evaluated burden of infection within 24 months after discharge., Results: We found no association between MBL levels and sepsis risk in the whole cohort. Infants without measurable MBL levels born between 32 0/7 to 36 6/7 weeks of gestation, however, had a higher rate of Gram-negative sepsis than infants with normal or reduced MBL levels. In a follow-up investigation at 24 months (n = 1070 infants), infants without measurable MBL levels suffered more frequently from stomatitis and urinary tract infection., Conclusions: In a large cohort of VLBWI MBL2 deficiency had no major impact on infection risk unless children were born between 32 0/7 and 36 6/7 weeks of gestation.
- Published
- 2017
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19. 3D Perception Technologies for Surgical Operating Theatres.
- Author
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Beyl T, Schreiter L, Nicolai P, Raczkowsky J, and Wörn H
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- Imaging, Three-Dimensional instrumentation, Photography instrumentation, Reproducibility of Results, Sensitivity and Specificity, Software, Surgery, Computer-Assisted instrumentation, Systems Integration, Video Games, Whole Body Imaging instrumentation, Imaging, Three-Dimensional methods, Operating Rooms methods, Pattern Recognition, Automated methods, Photography methods, Surgery, Computer-Assisted methods, Whole Body Imaging methods
- Abstract
3D Perception technologies have been explored in various fields. This paper explores the application of such technologies for surgical operating theatres. Clinical applications can be found in workflow detection, tracking and analysis, collision avoidance with medical robots, perception of interaction between participants of the operation, training of the operation room crew, patient calibration and many more. In this paper a complete perception solution for the operating room is shown. The system is based on the ToF technology integrated to the Microsoft Kinect One implements a multi camera approach. Special emphasize is put on the tracking of the personnel and the evaluation of the system performance and accuracy.
- Published
- 2016
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