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Untersuchung und Darstellung der Qualitätsveränderung von Agrarprodukten während der Trocknung
(2019)
Das Ziel der Arbeit war es optimale Trocknungsprozesse für verschiedene Agrarprodukte zu finden. Dazu wurden die Qualitätskriterien frischer und getrockneter Agrarprodukte analysiert und die Veränderungen durch die unterschiedlichen Trocknungsparameter, wie Luftgeschwindigkeit, Taupunkttemperatur, Trocknungstemperatur und –zeit dargestellt. In einer Literaturrecherche wurden sowohl die Faktoren für die Nachernteverluste und deren Höhe in Industrie- sowie Schwellen- und Entwicklungsländer untersucht. Zudem sind die Agrarprodukte und deren qualitätsbestimmenden Inhaltsstoffe vorgestellt. Auch die Extraktions- sowie die Analyse-Methoden werden aufgezeigt und erklärt. Dabei handelt es sich um die Hochleistungsflüssigkeit- und die Ionenausschlusschromatographie, aber auch um die UV/Vis-Spektroskopie und die Polarimetrie. Des Weiteren wurden während den Trocknungsprozessen mit der integrierten Kamera des Trockners in definierten Zeitabständen Bilder aufgenommen und diese über eine speziell entwickelte Software im Hinblick auf die Farbveränderung und die Schrumpfung der Agrarprodukte untersucht. Die Erstellung und Überprüfung der Versuchsergebnisse fand mittels Statistik-Software statt. Es wurden neue Diagramme, sogenannte Schädigungsdiagramme, eingeführt. Dabei handelt es sich um Diagramme, mit deren Hilfe die Identifizierung optimaler Trocknungsprozesse möglich ist. Für Chilis erwies sich eine Trocknungstemperatur von ~ 60 °C, für Kartoffeln von ~ 64 °C bis 74 °C, für Ananas von ~ 43 °C und Mangos von ~ 60 °C als optimal. Auch Taupunkttemperaturen von ~ <12 °C / >27 °C für Chilis, ~ 30 °C für Kartoffeln, ~ 14 °C für Ananas und ~ 20 °C Mangos waren optimal. Die Luftgeschwindigkeit wurde mit rund 1,2 m/s (Kartoffeln: ~ 1.2 m/s; Ananas: ~ 1.2 m/s und Mangos: ~ 0.9 m/s) als optimal befunden. Die Ergebnisse zeigten, dass bei jedem der vier Agrarprodukte die Trocknungstemperatur den größten Effekt auf die Reduzierung der qualitätsbestimmenden Eigenschaften hatte. Bei-spielsweise wurden die Ascorbinsäure, der Gesamtzucker-Gehalt sowie die organischen Säuren mit zunehmender Trocknungstemperatur stärker abgebaut. In Zukunft sollte neben den optimalen Trocknungsbedingungen auch beachtet werden, dass die Größe, Form, und Beschaffenheit der Proben einen entscheidenden Einfluss auf die stationären Trocknungsprozesse haben. Weiter ist es denkbar, instationäre Trocknungsprozesse zum Einsatz zu bringen. Dabei werden zuerst bei hohen Temperaturen die qualitätsreduzierenden Enzyme inaktiviert und anschließend bei geringen Temperatur und damit geringerer thermischer Belastung getrocknet. Weiter sollte darauf geachtet werden, dass Produkte nicht übertrocknen, so dass in Zukunft nur bis knapp unter den maximalen Restfeuchte-Gehalt und nicht wie in dieser Arbeit bis zur Gewichtskonstanz getrocknet wird.
In the field of autonomously driving vehicles the environment perception containing dynamic objects like other road users is essential. Especially, detecting other vehicles in the road traffic using sensor data is of utmost importance. As the sensor data and the applied system model for the objects of interest are noise corrupted, a filter algorithm must be used to track moving objects. Using LIDAR sensors one object gives rise to more than one measurement per time step and is therefore called extended object. This allows to jointly estimate the objects, position, as well as its orientation, extension and shape. Estimating an arbitrary shaped object comes with a higher computational effort than estimating the shape of an object that can be approximated using a basic geometrical shape like an ellipse or a rectangle. In the case of a vehicle, assuming a rectangular shape is an accurate assumption.
A recently developed approach models the contour of a vehicle as periodic B-spline function. This representation is an easy to use tool, as the contour can be specified by some basis points in Cartesian coordinates. Also rotating, scaling and moving the contour is easy to handle using a spline contour. This contour model can be used to develop a measurement model for extended objects, that can be integrated into a tracking filter. Another approach modeling the shape of a vehicle is the so-called bounding box that represents the shape as rectangle.
In this thesis the basics of single, multi and extended object tracking, as well as the basics of B-spline functions are addressed. Afterwards, the spline measurement model is established in detail and integrated into an extended Kalman filter to track a single extended object. An implementation of the resulting algorithm is compared with the rectangular shape estimator. The implementation of the rectangular shape estimator is provided. The comparison is done using long-term considerations with Monte Carlo simulations and by analyzing the results of a single run. Therefore, both algorithms are applied to the same measurements. The measurements are generated using an artificial LIDAR sensor in a simulation environment.
In a real-world tracking scenario detecting several extended objects and measurements that do not originate from a real object, named clutter measurements, is possible. Also, the sudden appearance and disappearance of an object is possible. A filter framework investigated in recent years that can handle tracking multiple objects in a cluttered environment is a random finite set based approach. The idea of random finite sets and its use in a tracking filter is recapped in this thesis. Afterwards, the spline measurement model is included in a multi extended object tracking framework. An implementation of the resulting filter is investigated in a long-term consideration using Monte Carlo simulations and by analyzing the results of a single run. The multi extended object filter is also applied to artificial LIDAR measurements generated in a simulation environment.
The results of comparing the spline based and rectangular based extended object trackers show a more stable performance of the spline extended object tracker. Also, some problems that have to be addressed in future works are discussed. The investigation of the resulting multi extended object tracker shows a successful integration of the spline measurement model in a multi extended object tracker. Also, with these results some problems remain, that have to be solved in future works.
This paper presents the integration of a spline based extension model into a probability hypothesis density (PHD) filter for extended targets. Using this filter the position and extension of each object as well as the number of present objects can jointly be estimated. Therefore, the spline extension model and the PHD filter are addressed and merged in a Gaussian mixture (GM) implementation. Simulation results using artificial laser measurements are used to evaluate the performance of the presented filter. Finally, the results are illustrated and discussed.
Summary of the 8th Workshop on Metallization and Interconnection for Crystalline Silicon Solar Cells
(2019)
This article gives a summary of the 8th Metallization and Interconnection workshop and attempts to place each contribution in the appropriate context. The field of metallization and interconnection continues to progress at a very fast pace. Several printing techniques can now achieve linewidths below 20 μm. Screen printing is more than ever the dominating metallization technology in the industry, with finger widths of 45 μm in routine mass production and values below 20 μm in the lab. Plating technology is also being improved, particularly through the development of lower cost patterning techniques. Interconnection technology is changing fast, with introduction in mass production of multiwire and shingled cells technologies. New models and characterization techniques are being introduced to study and understand in detail these new interconnection technologies.
Ziel der Masterarbeit war es, die Feuchtigkeitseigenschaften von Estrichen bei unterschiedlichen Klimaten mithilfe von Sorptionsisothermen zu charakterisieren. Die wenigen Literaturangaben zu Sorptionsisothermen von mineralischen Estrichen beziehen sich im Wesentlichen auf Calciumsulfatestriche und genormte Zementestriche (ohne dass die Zementart: Portlandzemente, Hochofenzemente bzw. CEM I, CEM II, CEM III etc. unterschieden werden) und i.d.R. nur auf eine Lufttemperatur (= 20 Grad C). Anliegen der Arbeit war es, zusätzlich die seit ca. 20 Jahren marktüblichen ternären Schnellzemente mit zu untersuchen und die baupraktisch interessanten Temperaturen von 15 Grad C und 25 Grad C einzubeziehen. Ebenso wurden die Auswirkungen der Klimabedingung auf der Baustelle (Jahreszeit, Luftfeuchtigkeit, Temperatur) auf den Hydratationsvorgang der Estriche untersucht. Dabei wurden jeweils nicht nur ein Vertreter der verschiedenen Bindemittelsysteme, sondern mindestens zwei verschiedene Estriche unterschiedlicher Hersteller mit einbezogen. In Kombination mit den Ergebnissen der Gefügeuntersuchungen (u. a. Hg-Porosametrie) wird belegt, weshalb sich die zement- und schnellzementgebundenen Estriche vollkommen anders verhalten als die calciumsulfatgebundenen Estriche. Dieses unterschiedliche Verhalten ist auch einer der Gründe, warum Estriche mit der KRL-Methode in Bezug auf ihren Feuchtegehalt nicht bewertet werden können. Aus diesem Grund folgt ein Vergleich der Materialfeuchtemessungen "KRL-Methode" mit der handwerksüblichen und seit Jahrzehnten in der Praxis bewährten "CM-Methode".
Flatness-based feed-forward control of solenoid actuators is considered. For precise motion planning and accurate steering of conventional solenoids, eddy currents cannot be neglected. The system of ordinary differential equations including eddy currents, that describes the nonlinear dynamics of such actuators, is not differentially flat. Thus, a distributed parameter approach based on a diffusion equation is considered, that enables the parametrization of the eddy current by the armature position and its time derivatives. In order to design the feedforward control, the distributed parameter model of the eddy current subsystem is combined with a typical nonlinear lumped parameter model for the electrical and mechanical subsystems of the solenoid. The control design and its application are illustrated by numerical and practical results for an industrial solenoid actuator.
At the University of Applied Sciences Konstanz, Germany, a modern electronically controlled dynamometer and several cars are available for tests. Numerous studies have been carried out, and the latest results will be presented. The paper is intended to explain different tests under load. One focus is the driving cycle WLTC (Worldwide harmonized Light vehicles Test Cycle) and the requirements for the proper conduct of investigation with this driving cycle. Two and three wheelers have a great importance for mobility in various Asian countries. But also in other countries, this segment is very important for the so-called First or Last Mile Vehicles. Because of this, a short explanation of the driving cycle WMTC (Worldwide harmonized Motorcycle Emissions Certification/Test Procedure) is given. The various possibilities for the operation of the dynamometer and for carrying out various experiments are shown.
Other important figures that can be determined on a dynamometer are the wheel power, the power losses and eventually the engine performance. With the brake specific torque, the traction force at the propelled wheels, the maximum acceleration or maximum gradeability of a car can be determined.
As well the slippage related to load can be measured on the dynamometer. The dynamic wheel radius of the driven wheels has a significant influence on the slippage. Because of the temperature increase of the tires during the tests the tire pressure increases. A rise of tire temperature, tire pressure, and wheel speed results in an increase of the dynamic wheel radius and slippage. Equations for the determination of the dynamic wheel radius are presented.
This thesis deals with the object tracking problem of multiple extended objects. For instance, this tracking problem occurs when a car with sensors drives on the road and detects multiple other cars in front of it. When the setup between the senor and the other cars is in a such way that multiple measurements are created by each single car, the cars are called extended objects. This can occur in real world scenarios, mainly with the use of high resolution sensors in near field applications. Such a near field scenario leads a single object to occupy several resolution cells of the sensor so that multiple measurements are generated per scan. The measurements are additionally superimposed by the sensor’s noise. Beside the object generated measurements, there occur false alarms, which are not caused by any object and sometimes in a sensor scan, single objects could be missed so that they not generate any measurements.
To handle these scenarios, object tracking filters are needed to process the sensor measurements in order to obtain a stable and accurate estimate of the objects in each sensor scan. In this thesis, the scope is to implement such a tracking filter that handles the extended objects, i.e. the filter estimates their positions and extents. In context of this, the topic of measurement partitioning occurs, which is a pre-processing of the measurement data. With the use of partitioning, the measurements that are likely generated by one object are put into one cluster, also called cell. Then, the obtained cells are processed by the tracking filter for the estimation process. The partitioning of measurement data is a crucial part for the performance of tracking filter because insufficient partitioning leads to bad tracking performance, i.e. inaccurate object estimates.
In this thesis, a Gaussian inverse Wishart Probability Hypothesis Density (GIW-PHD) filter was implemented to handle the multiple extended object tracking problem. Within this filter framework, the number of objects are modelled as Random Finite Sets (RFSs) and the objects’ extent as random matrices (RM). The partitioning methods that are used to cluster the measurement data are existing ones as well as a new approach that is based on likelihood sampling methods. The applied classical heuristic methods are Distance Partitioning (DP) and Sub-Partitioning (SP), whereas the proposed likelihood-based approach is called Stochastic Partitioning (StP). The latter was developed in this thesis based on the Stochastic Optimisation approach by Granström et al. An implementation, including the StP method and its integration into the filter framework, is provided within this thesis.
The implementations, using the different partitioning methods, were tested on simulated random multi-object scenarios and in a fixed parallel tracking scenario using Monte Carlo methods. Further, a runtime analysis was done to provide an insight into the computational effort using the different partitioning methods. It emphasized, that the StP method outperforms the classical partitioning methods in scenarios, where the objects move spatially close. The filter using StP performs more stable and with more accurate estimates. However, this advantage is associated with a higher computational effort compared to the classical heuristic partitioning methods.
This paper presents a new likelihood-based partitioning method of the measurement set for the extended object probability hypothesis density (PHD) filter framework. Recent work has mostly relied on heuristic partitioning methods that cluster the measurement data based on a distance measure between the single measurements. This can lead to poor filter performance if the tracked extended objects are closely spaced. The proposed method called Stochastic Partitioning (StP) is based on sampling methods and was inspired by a former work of Granström et. al. In this work, the StP method is applied to a Gaussian inverse Wishart (GIW) PHD filter and compared to a second filter implementation that uses the heuristic Distance Partitioning (DP) method. The performance is evaluated in Monte Carlo simulations in a scenario where two objects approach each other. It is shown that the sampling based StP method leads to an improved filter performance compared to DP.
Flooded Edge Gateways
(2019)
Increasing numbers of internet-compatible devices, in particular in the context of IoT, usually cause increasing amounts of data. The processing and analysis of a continuously growing amount of data in real-time by means of cloud platforms cannot be guaranteed anymore. Approaches of Edge Computing decentralize parts of the data analysis logics towards the data sources in order to control the data transfer rate to the cloud through pre-processing with predefined quality-of-service parameters. In this paper, we present a solution for preventing overloaded gateways by optimizing the transfer of IoT data through a combination of Complex Event Processing and Machine Learning. The presented solution is completely based on open-source technologies and can therefore also be used in smaller companies.
Angesichts der aktuellen höchstrichterlichen Rechtsprechung ist der betagte oder sonst hinfällige, auf Geldentschädigung klagende Verletzte gezwungen, in Rechtsmittelüberlegungen sein nahendes Ableben als erhebliches Prozessrisiko mit einzubeziehen. Das führt zu einer beträchtlichen Schmälerung der ideellen Bestandteile seines Persönlichkeitsrechts. Es ist daher dringend geboten, im Wege der richterlichen Rechtsfortbildung Kriterien für Ausnahmefallgruppen aufzustellen, um untragbare Härtefälle künftig verlässlich auszuschließen.