1,608 research outputs found
Comparison of Renal Transplantation Outcomes in Patients After Peritoneal Dialysis and Hemodialysis – A Case Control Study and Literature Review
AI for Earth System Science - Ocean & Cryosphere in Climate, Workshop
The Workshop within the Research Program "Changing Earth - Sustain our Future" focuses on Artificial Intelligence topics and projects within the Data Science sub-cluster in Subtopic 2.4. Common directions and posible collaborations are discussed in four thematic sessions: AI Classification, Explainable AI, AI for Parameterization, and AI Enablement
Methods, Applications and Services 2024 Workshop-Seminar of the AI-Cluster in Subtopic 2.4
The yearly Wokshop is forum for data science research, developments and support services. The agenda is published regularly online
A Compact Millimeter-Wavelength Fourier-Transform Spectrometer
We have constructed a Fourier-transform spectrometer (FTS) operating between
50 and 330 GHz with minimum volume (355 x260 x64 mm) and weight (13 lbs) while
maximizing optical throughput (100 sr) and optimizing the
spectral resolution (4 GHz). This FTS is designed as a polarizing
Martin-Puplett interferometer with unobstructed input and output in which both
input polarizations undergo interference. The instrument construction is simple
with mirrors milled on the box walls and one motorized stage as the single
moving element. We characterize the performance of the FTS, compare the
measurements to an optical simulation, and discuss features that relate to
details of the FTS design. The simulation is also used to determine the
tolerance of optical alignments for the required specifications. We detail the
FTS mechanical design and provide the control software as well as the analysis
code online.Comment: Submitted to Applied Optics. [Copyright 2019 Optical Society of
America]. Users may use, reuse, and build upon the article, or use the
article for text or data mining, so long as such uses are for non-commercial
purposes and appropriate attribution is maintained. All other rights are
reserve
Selektive Unkrautbekämpfung mittels Lasertechnik
In diesem Beitrag werden technische und wachstumsrelevante Aspekte des Einsatzes von Lasertechnik zur Unkrautbekämpfung vorgestellt. In der Erforschung thermischer Unkrautbekämpfung mittels Laser stand zunächst die Wechselwirkung zwischen Laserstrahl und Unkrautpflanze im Vordergrund. Nach Auswahl eines CO2-Lasers auf Basis erster Ergebnisse wurde für weitere Studien unter Berücksichtigung der Faktoren Laserenergie, Laserspotfläche, Abdeckung des Meristems, Unkrautart und Unkrautwuchsgröße die letale Schädigung modelliert. Dies wurde für die untersuchte Unkrautpflanze Amaranthus retroflexus dargestellt. Das Modell diente der Festlegung der online zu applizierenden Laserenergie. Darüber hinaus wurde die für eine wirksame Schädigung erforderliche Laserstrahlpositionierung untersucht sowie ein Testsystem entworfen. Mithilfe aktueller Bildverarbeitungssalgorithmen zur Unkrauterkennung und zur Bestimmung der Zielobjekte wurde eine Laser-Servomotor-Ansteuerung entwickelt. Das Projekt, in dessen Rahmen wesentliche Teile dieses Beitrages durchgeführt wurden, wird unter dem Titel „Untersuchungen zur Laserlichtwirkung auf der Basis von Bildanalysen auf juvenile Pflanzen zur Unkrautregulierung“ von der Deutschen Forschungsgemeinschaft gefördert.Stichwörter: Laser-Applikation, Schädigungsmodell, Unkrautbekämpfung, ZielfindungSelective weed control using laser techniquesThis contribution discusses technical and growth relevant aspects of using laser techniques for weed control. The research on thermal weed control via laser first focused on the interaction of laser beams and weed plants. Due to preliminary studies, a CO2-laser was selected for further studies with regard to the process factors laser energy, laser spot area, coverage of the weeds meristem, weed species (Amaranthus retroflexus), and weed growth stage. Thereby, the laser damage was modeled in order to control the necessary laser output power online. Furthermore, the beam positioning leading to an effective damaging of the weeds was investigated and a test device was designed. With the aid of contemporary image processing algorithms for weed recognition and meristem determination, a laser and servo-motor control was developed. Most of the studies presented in this paper were part of the project “Investigations on laser light affected weed control of juvenile plants with the aid of image processing” funded by the Deutsche Forschungsgemeinschaft.Keywords: Damage model, laser application, targeting, weed contro
Second Data Science Symposium at AWI
The second Data Science Symposium at AWI gathered several data science related talks from AWI, GEOMAR and HZG
Compact millimeter-wavelength Fourier-transform spectrometer
We have constructed a Fourier-transform spectrometer (FTS) operating between 50 GHz and 330 GHz with minimum volume (355×260×64 mm) and weight (5.9 kg) while maximizing optical throughput (100 mm^2 sr) and optimizing the spectral resolution (4 GHz). This FTS is designed as a polarizing Martin–Puplett interferometer with unobstructed input and output in which both input polarizations undergo interference. The instrument construction is simple with mirrors milled on the box walls and one motorized stage as the single moving element. We characterize the performance of the FTS, compare the measurements to an optical simulation, and discuss features that relate to details of the FTS design. The simulation is also used to determine the tolerance of optical alignments for the required specifications. We detail the FTS mechanical design and provide the control software as well as the analysis code online
Correction to: Solve-RD: systematic pan-European data sharing and collaborative analysis to solve rare diseases (European journal of human genetics : EJHG (2021) 29 9 (1325-1331))
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