Practical trainings, student assistants and theses

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Halogen element (F, Cl, Br, and I) content and distribution in natural and synthetic sphalerite – a SIMS study (Id 236)

Master theses / Diploma theses

Foto: Sphaleritprobe für SIMS Untersuchungen ©Copyright: René ZiegenrückerDue to crystallochemical considerations, sphalerite (ZnS) as a typical sulfide mineral should not contain high contents of the halogen elements fluorine, chlorine, bromine and iodine. Current research findings proved at least for chlorine and bromine elevated contents up to 1000 µg*g-1 (Cl) and x0 µg*g-1 (Br). If it appears that the halogen elements are built into the lattice and not in fluid- and mineral inclusions we will be able to draw conclusions about the chemical as well as physicochemical parameters of the ore-forming fluids.
Using the Super-SIMS setup we could prove that all halogens are detactable in natural sphalerites.
The aim of the thesis is to analyse and compare these natural sphalerites by normal SIMS. Additionally halogen-rich synthetic sphalerites will be analysed.

Department: Analytics

Contact: Dr. Renno, Axel

Requirements

• You study geosciences, material's sciences or chemistry
• You are interested in mineralogical or analytical problems
• You are interested in modern analytical techniques
• You show initiative and good teamwork skills

Conditions

Start immediately
project period in accordance withe respective study regulations (est. 6 month)

Links:

Online application

Please apply online: english / german

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Evaluation of the HDF5 file format for measurement data archiving at Dresdyn (Id 235)

Student practical training / Bachelor theses / Compulsory internship / Volunteer internship

At the Institute of Fluid Dynamics, Dresdyn will be a new large-scale experiment built up. The measurement data from several PLCs and Microcontrollers are captured and must be archived. Due to high incoming data rates a perfomant software is necessary for writing the archive data.

The task includes the following topics:
- Investigation of the HDF5 file format (structure, performance, parallel processing)
- Specification and optimization of a data storage structure for continuous data streams
- Creation of libraries for use in the logging system as well as in non-time critical evaluation

Institute: Department of Research Technology

Contact: Wagner, Nicole, Meyer, Markus

Requirements

- Advanced knowledge in C ++
- Basic knowledge of Linux

Conditions

- Duration: 3-5 months
- Start: now

Online application

Please apply online: english / german

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Untersuchung konvektionsgetriebener Beeinflussung des Erstarrungsgefüges von Leichtmetalllegierungen (Id 234)

Bachelor theses / Master theses / Diploma theses / Student Assistant

Die Gefügeeigenschaftsbeziehungen fordern für Konstruktionswerkstoffe zumeist ein möglichst feines, homogenes und isotrop belastbares Erstarrungsgefüge. Für Aluminiumgusslegierungen wird dies durch Zusätze von Veredelungs- und Kornfeinungsmitteln erreicht. Diese Zusätze verursachen Kosten, sind problematisch bezüglich Recycling sowie dem Umweltschutz und haben weitestgehend keinen positiven Einfluss auf intermetallische Verbindungen. Es besteht daher der Wunsch, ohne Zusätze ein feines und homogenes Erstarrungsgefüge einstellen zu können. Ein probates Mittel ist der Einsatz von elektromagnetischen Feldern. Diese sind für Leichtmetallschmelzen zur kontaktlosen Erzeugung einer Strömung mit nachweislich positiven Effekten geeignet. Dabei sind die Auswirkungen auf die Morphologie von intermetallischen Verbindungen kaum erforscht.

Ziel ist es, mit Hilfe von elektromagnetisch erzeugter Konvektion die Kristallisationsmorphologie von intermetallischen Phasen zu verändern und gleichzeitig Kornfeinungsmittel ganz oder teilweise zu substituieren. Für die wissenschaftliche Bewertung der Aluminium-Gussbolzen ist eine qualitative und quantitative Gefügecharakterisierung notwendig. Zusätzlich besteht die Möglichkeit, die Metallurgie von Aluminiumlegierungen kennenzulernen und den Erstarrungsverlauf an Hand von Temperaturverläufen zu studieren. Grundlage für die Arbeit ist es, sich in die Thematik des elektromagnetischen Rührens von Metallen und deren Auswirkung auf das Gefüge einzuarbeiten. Des Weiteren wird eine selbständige Arbeitsweise bei der Gefügeanalyse erwartet. Es sollte Interesse an Erstarrungsvorgängen und der damit einhergehenden Gefügeausbildung bestehen.

Department: Magnetohydrodynamics

Contact: Dr. Räbiger, Dirk, Willers, Bernd

Requirements

Die Ausschreibung richtet sich an Studentinnen und Studenten der Fachrichtung Werkstoffwissenschaft, Giessereiwesen, Urformtechnik, ...

Conditions

Beginn: ab sofort
Bearbeitungszeit: Variabel nach Interesse und Themenauswahl
Bewerbung mit Lebenslauf und Zeugnissen
Vergütung nach hausinternen Vergütungsregeln

Online application

Please apply online: english / german

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Entwicklung, Aufbau und Funktionsnachweis eines Ultraschallwellenleiters zur Bestimmung der Durchflussgeschwindigkeit in Chloridsalzschmelzen bei 800 °C (Id 233)

Bachelor theses / Master theses / Diploma theses / Student Assistant

Aufgrund der sich aus der Energiewende ergebenden Anforderungen für das Stromnetz besteht die wissenschaftliche Erfordernis, innovative Systeme zur Speicherung und effizienten Nutzung fluktuierend bereitgestellter Energiemengen zu entwickeln. An der TU Dresden, Professur für Wasserstoff- und Kernenergietechnik wird im Rahmen des Projektes SYNKOPE-flex ein System zur Speicherung und zum Transport von Wärme mittels Salzschmelzen weiterentwickelt, wie es beispielsweise in solarthermischen Kraftwerken (CSP) Anwendung finden kann. Dazu wird zur Untersuchung des Wärmespeicherverhaltens von Chloridsalzschmelzen sowie der Material-Schmelze-Interaktion, insbesondere der Korrosion in Strömungen ein Versuchsstand errichtet.
Im Rahmen einer studentischen Arbeit soll für ein Durchfluss-Messsystem ein Ultraschall-Wellenleiter entwickelt werden, welcher die Bestimmung der Strömungsgeschwindigkeiten in Chloridsalzschmelzen ermöglicht. Dazu sollen am Helmholtz-Zentrum Dresden-Rossendorf (HZDR) verschiedene Werkstoffe für einen Ultraschall-Wellenleiter getestet und auf deren Eigenschaften in Salzschmelzen hin charakterisiert werden. Nach Abschluss der Werkstoffanalyse wird ein Demonstrator des Wellenleiters gefertigt und ein Machbarkeitsnachweis erbracht. Die Arbeiten und Versuche erfolgen am Standort des HZDR in Rossendorf nahe Dresden.
Schwerpunkte:
• Literaturrecherche zu Durchflussmessverfahren und Bewertung hinsichtlich des Einsatzes in Hochtemperatur-Chloridsalzschmelzen.
• Auswahl eines Wellenleitermaterials hinsichtlich akustischer, chemischer und thermischer Eignung
• Systematische Materialuntersuchung und Auswertung der Sensorwerkstoffe
• Nutzung der Versuchsergebnisse zur Entwicklung eines Demonstrator-Messsystems mit Funktionsnachweis
• Dokumentation der Ergebnisse

Department: Magnetohydrodynamics

Contact: Dr. Räbiger, Dirk

Requirements

Studenten/Studentinnen im Bereich Werkstofftechnik, Elektrotechnik und Maschinenbau bevorzugt
Interesse an experimenteller Arbeit
Strukturierte, selbstständige Arbeitsweise

Conditions

Beginn: ab sofort
Bearbeitungszeit: 4-6 Monate
Bewerbung mit Lebenslauf und Zeugnissen
Vergütung nach hausinternen Vergütungsregeln

Online application

Please apply online: english / german

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VOF simulation of bubble formation using OpenFoam (Id 231)

Master theses / Diploma theses

The formation of gas bubbles by submerged needles or orifices is of great importance for diverse industrial applications, because it influences the bubble size and thereby bubble rise velocity. To optimize the industrial process, the fundamental physics of the bubble formation should be understood. However, some of the fundamental knowledge is still lacking. The goal of this work is to investigate the bubble formation, growth and departure from a submerged orifice using the volume of fluid (VOF) method in OpenFoam. The main tasks include:

• Simulation of the bubble formation and departure process using interFoam
• Acquiring the parameters of interest, e.g. bubble size, shape and detachment frequency, from the simulation results by writing post-processing scripts
• Analyse and document simulation results

Department: Computational Fluid Dynamics

Contact: Dr. Liao, Yixiang

Requirements

• Good C++/C programming skills
• Experience with OpenFOAM
• Basic knowledge of fluid dynamics and CFD
• Good English in writing and reading

Conditions

• Begin: from now on
• Duration: 4-6 months

Online application

Please apply online: english / german

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3D chemical imaging inside materials (Id 230)

Master theses

Foto: 3D visualization of a sulfide vein with disseminated gold ©Copyright: HZDR/ Jose Godinho2-dimensional imaging of surfaces is the preferred method to analyse the microstructure of rocks for industrial and academic research. The main advantages of 2D imaging are the high resolution and the possibility to analyse the chemical and mineral composition of surfaces. 3D imaging of mineral phases inside a material is also possible using tomographic techniques although the resolution is often lower than surface techniques and no elemental information can be derived. A new energy detector capable of identifying the elements inside rocks is being tested. The student will use the new detector to identify chemical elements and mineral phases inside samples in order to develop new analytical techniques to answer questions important to research and to industry.

Different cases studies are possible:

Project 1: Gold and galena are very dense minerals with similar spatial distribution in porphyritic deposits, which makes them indistinguishable using normal CT. The goal is to optimize the scanning conditions, using the new detector, to identify the valuable gold particles. These particles will be characterized using 3D imaging to estimate the potential value of the deposit and to help defining the mining and mineral processing strategy. Important 3D characteristics include mineral association (pirite/ chalcopyrite/ quartz), particle size distribution. 3D results will be compared to 2D mineral liberation analysis. Due to the small size of gold particles calibration using larger particles may be required.

Project 2: Tin and gold are important technological components of electronic devices (e.g. up to 3 g of Sn in each iphone). To meet their increasing demand mining lower grade deposits and recycling obsolete electronics are necessary. Common to mining and recycling are the steps of grading the elemental content of either rocks or scrap so that the material can be sorted and processed efficiently. A radiographic technique using the new detector will be tested to grade the content of tin and gold. The project aims to determine the suitability of the technique for larger scale application by optimizing the experimental conditions and assessing the spatial resolution, particle size limits, sample environment effect (rock vs scrap), and other factors. Ultimately, the concentration of other minor elements (Bi, Ag, Pb, In) may be detectable, which could be good or could interfere with the measurement of Au and Sn.

Project 3: Rare earth elements, fundamental to HiTec applications, are usually mined as a mixture of lanthanides present in a mixture of primary and secondary minerals, such as xenotime (YPO4), monazite (CePO4) as well as parasite (Ca(Ce,La)2(CO3)3F2) or bastnaesite (Ce(CO3)F). The presence of some lanthanides and their relative abundance, especially the economic extremely important ratio of HREE (Y + Gd - Lu) to LREE (La - Gd) can vary significantly even within the same deposit depending on the ore formation mechanism. This work aims to define the principal analytical parameters necessary to estimate the LREE/HREE value in a sample with other minerals with similar densities present.

Most experimental work is similar to all projects
- Preparation of calibration samples with known properties to evaluate the resolution of the technique.
- Optimization of scanning conditions to maximize resolution and contrast between phases.
- Characterize the 3D mineralogical properties of a material using 3D image processing techniques.
- Correlate 3D chemical imaging to 2D SEM imaging, XRD and XRF to compare and validate the new technique.

Expected learning outcomes
– Hands on experience with CT and 3D image processing techniques
– Knowledge of laboratory procedures and analytical techniques used in raw materials research and industry
– Experience developing analytical methods
– Work in an international collaboration project

Institute: Helmholtz Institute Freiberg for Resource Technology

Contact: da Assuncao Godinho, Jose Ricardo, Dr. Renno, Axel

Requirements

This project is part of a collaboration between UoG, HIF and industry so that collaboration with a partner's research activities is desirable.
Requirements:
- Good spoken and written English
- Enthusiasm for experimental and analytical laboratory work
- Creativity and desire to do new things
- Studying a subject related to Earth or materials sciences

Conditions

- Start anytime
- Indicate the prefered topic in your application

Links:

Online application

Please apply online: english / german

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Dynamics of particles at interfaces (Id 229)

Master theses / Diploma theses

Foto: Drop shape change ©Copyright: Milad EftekhariInterfaces between air-liquid, liquid-liquid and liquid-solid are very important and they affect many industrial processes including flotation. Here, we want to hydrophobize particles by means of surfactants adsorption and investigate their attachment to air-liquid interface. This is important as the interfacial interactions between bubbles, particles and liquid determine the efficiency of flotation process.

We aim to understand:

• The effect of surfactant tail length on hydrophobicity of particles and their interfacial behavior
• The effect of salinity and pH on interfacial behavior of surfactant molecules
• The influence of these variables on the properties of emulsions and foams

Experimental methods:

• Profile analysis tensiometry (PAT)
• Zeta potential measurements and particle sizing by dynamic light scattering (DLS)

These experimental methods and the topic of particles at interfaces can prepare you for different jobs after graduation, as these concepts are widely applicable in various areas such as mineral processing, recycling, pharmaceutics, cosmetics, painting and so on.

Department: Transport processes at interfaces

Contact: Dr. Schwarzenberger, Karin, Eftekhari, Milad

Requirements

• Study in process engineering, chemical engineering (or comparative field of study)
• Motivation, interest in this field of research, experimental experience
• Optimally: basic knowledge in particle and interface science

Conditions

• Duration min. 3 month
• Start: from now

Online application

Please apply online: english / german

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Direct numerical simulation of aerosol deposition in turbulent flows (Id 228)

Bachelor theses / Master theses / Diploma theses / Compulsory internship

The institute of fluids dynamics has been developing various numerical tools for the prediction of particle transport in flows. A distinguished feature of the institute lies in the deposition and resuspension of solid particles in turbulent flows. In many industrial and natural processes, the deposition of solid particles is of significant importance. A typical example includes for instance the deposition and the resuspension of microplastic particles in rivers. Our previous experimental and numerical studies showed that the deposition of particles is considerably increased in a turbulent flow evolving over a rough wall surface. Within the frame of a 6-month internship, a model will be developed to randomly generate realistic three-dimensional terrains (height maps). The objective of the internship will be to study the effect of randomness in the generated terrains on the particle deposition rate. The flow simulations will be performed using direct numerical simulations.

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Lecrivain, Gregory

Requirements

• Student with above average marks
• good programing skills
• good written and oral communication skills in English, German language is an asset (free classes are available on site)

Conditions

• 6-month internship
• Interest in multiphase flow phenomenas and in applied mathematics

Online application

Please apply online: english / german

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Process intensification of multiphase reactors (Id 227)

Bachelor theses / Master theses / Diploma theses

Foto: Rotating fixed bed reactor for process intensification of multiphase reactions #1 ©Copyright: Dr. Markus SchubertMultiphase reactors are widely used in the chemical industry. Especially, trickle bed reactors are advantageous, due to the high residence time, which compensate low diffusion rates. Examples are hydrogenations, aminations or oxidation of glucose.
Recently, a new multiphase reactor was developed to intensify the mass transfer by the superposition of rotation an inclination. To investigate the innovative reactor concept a modelling approach for the space-time-yield is necessary.
In the framework of a student thesis a reactor-particle model will be investigated via simulation studies. Additionally, further model improvements will be considered as the incorporation of heat balances. The simulations have to be executed in the MATLAB environment.

Department: Experimental Thermal Fluid Dynamics

Contact: Timaeus, Robert

Requirements

Studies in chemical engineering, process engineering or similar fields

Online application

Please apply online: english / german

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Simulation Tools for Liquid Metal Batteries (Id 226)

Student Assistant

Foto: Lithium liquid metal electrode ©Copyright: ©Steffen Landgraf, Michael NimtzIn contrast to conventional batteries, Liquid Metal Batteries feature all liquid anodes (alkali or earthalkalimetal), cathodes (transition metal or metal) and electrolytes (molten salts) at a temperature between 400 °C and 600 °C.
To simulate single cells and battery systems, a software package was developed (language: Python) at HZDR. This student assistant position is about the testing and documenting existing routines, and implementing new functions and routines.
The main topics are:
- Determination of the charge- and discharge behavior (electrical, thermal)
- Simulation of scenarios
- Optimization of energy and power density
- Geometrical-mechanical design and engineering
- Refinement of models and adaption to new cell chemistries
- Improivement of simulation times and storage management

Department: Magnetohydrodynamics

Contact: Dr. Nimtz, Michael

Requirements

Studies in chemistry, process engineering, mechanical engineering or physics, first experiences in programming (any language)

Conditions

Start: immediately
Duration: long-term

Links:

Online application

Please apply online: english / german

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Design of a flexible Haber-Bosch process (Id 225)

Bachelor theses / Master theses / Diploma theses

As part of the Energiewende, the Institute for Fluid Dynamics at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) is adapting energy intensive processes for the production of chemicals to be supplied only with electricity from renewable resources.
Ammonia is the second most produced chemical worldwide and the basis of all nitrogen-based fertilizers. Novel production paths include the combination of Haber-Bosch synthesis and water electrolysis.
The objective of the thesis is to model in Aspen Plus a Haber-Bosch process capable of operating with an intermittent energy supply, whether from renewable resources or from low priced electricity.
During the thesis, you are expected to perform the following tasks:
• Collect data on ammonia production using renewable energies and other flexible energy sources and its simulation.
• Design a dynamic Haber-Bosch process.
• Adapt the process for its operation with an intermittent energy supply.
• Assess the compatibility of the process with flexible water electrolysis and air separation.

Department: Experimental Thermal Fluid Dynamics

Requirements

• Student of Chemical, Process or Electrical Engineering, Energy Technology (Renewable Energy Systems) or similar.
• Experience with Aspen Plus, ChemCAD or similar
• High level of English.

Conditions

6 month, start immediately

Online application

Please apply online: english / german

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Design of a flexible water electrolyzer (Id 224)

Bachelor theses / Master theses / Diploma theses

As part of the Energiewende, the Institute for Fluid Dynamics at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) is adapting energy intensive processes for the production of chemicals to be supplied only with electricity from renewable resources.
Besides being the source of renewable-based hydrogen, water electrolysis is the key stage of all the Power-to-X processes and the production of commodities such as ammonia.
The objective of the thesis is to model in Aspen Plus a water electrolyzer process capable of operating with an intermittent energy supply, whether from renewable resources or from low priced electricity.
As part of the thesis, you are expected to perform the following tasks:
• Collect data on water hydrolysis using renewable energies and other flexible energy sources and its simulation.
• Design a dynamic electrolyzer.
• Adapt it for its operation with an intermittent energy supply.
• Assess the compatibility of the process with flexible air separation, ammonia synthesis (Haber-Bosch process).
• Evaluate its O2 generation potential.

Department: Experimental Thermal Fluid Dynamics

Requirements

• Student of Chemical or Process Engineering, Energy Technology (Renewable Energy Systems), or similar.
• Experience with Aspen Plus, ChemCAD or similar
• High level of English.

Conditions

6 month, start immediately

Online application

Please apply online: english / german

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Design of a flexible pressure swing adsorption (PSA) process (Id 223)

Bachelor theses / Master theses / Diploma theses / Compulsory internship

As part of the Energiewende, the Institute for Fluid Dynamics at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) is adapting energy intensive processes for the production of chemicals to be supplied only with electricity from renewable resources.
Air separation is the source of two diatomic molecules key to a number of industrial processes, O2, and N2. Pressure Swing Adsorption (PSA) is a process capable of producing N2 for erratic use patterns, and thus, a possible candidate for flexible operation.
The objective of the thesis is to model in Aspen Plus/Aspen Adsorption a PSA process capable of operating with an intermittent energy supply, whether from renewable resources or from low priced electricity.
The thesis project has the following aims:
• Collect data on air separationunits using renewable energies and other flexible energy sources and its simulation.
• Design a dynamic PSA process.
• Adapt it for its operation with an intermittent energy supply.
• Assess the compatibility of the process with flexible water electrolysis, and ammonia synthesis (Haber-Bosch process).
• Evaluate its O2 generation potential.

Department: Experimental Thermal Fluid Dynamics

Requirements

• Student of Chemical or Process Engineering, Energy Technology (Renewable Energy Systems), or similar.
• Experience with Aspen Plus, ChemCAD or similar
• High level of English.

Conditions

6 month, start immediately

Online application

Please apply online: english / german

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Synthesis and characterization of isotope specific 'in-house standards' for the analysis of light and medium-heavy trace elements in natural minerals by secondary ion mass spectrometry (SIMS) and electron probe microanalysis (EPMA) (Id 222)

Master theses / Diploma theses

Foto: cesium ion source Cameca IMS 7f-Auto ©Copyright: René ZiegenrückerSecondary Ion Mass Spectrometry (SIMS) is a microanalytical method with a very good lateral and depth resolution combined with excellent limits of detection as well as a weak degree of destruction.
However, the method is very matrix sensitive and requires matrix adapted reference materials. Actually, there are no certified reference materials available for mineralogical studies. Therefore most SIMS labs use so-called ‘in-house’ standards.
The concentration of trace elements in minerals is of great economic importance as a quality parameter for raw materials. On the other hand, it bears very valuable genetic mineralogical information.
In collaboration with an industrial partner we will use the new method "energy-filter for ion implantation" as a tool for the production of matrix-matched reference materials (RMs) with a homogeneous trace element distribution in all three dimensions. These RMs will be used for SIMS and EPMA purposes.
The thesis project has the following aims:
• Determination of implantation possibilities for selected elements over the complete range of densities of naturally minerals using the available filters
• Calculation of the implantation parameters
• Experimental test of these parameters on selected minerals
• Test of the implantation by means of SIMS and EPMA

Department: Analytics

Contact: Dr. Renno, Axel

Requirements

• You study physics, material's sciences or engineering
• You are interested in mineralogical or analytical problems
• You are interested in modern analytical techniques
• You show initiative and good teamwork skills

Conditions

Start immediately
project period in accordance withe respective study regulations (est. 6 month)

Links:

Online application

Please apply online: english / german

Druckversion


Synthesis and characterization of isotope specific 'in-house standards' for the analysis of trace elements in natural quartz (SiO2) by secondary ion mass spectrometry (SIMS) and electron probe microanalysis (EPMA) (Id 221)

Master theses / Diploma theses

Foto: synthetic quartz crystal ©Copyright: Dr. Axel RennoSecondary Ion Mass Spectrometry (SIMS) is a microanalytical method with a very good lateral and depth resolution combined with excellent limits of detection as well as a weak degree of destruction.
However, the method is very matrix sensitive and requires matrix adapted reference materials. Actually there are no certified reference materials available for mineralogical studies. Therefore most SIMS labs use so-called ‘in-house ’ standards.
The concentration of trace elements in natural quartzes is a very important quality parameter for the usage of these minerals as a raw material. On the other hand it bears very valuable genetic mineralogical information.
In collaboration with an industrial partner we will use the new method "energy-filter for ion implantation" as a tool for the production of matrix-matched reference materials (RMs) with a homogeneous trace element distribution in all three dimensions. These RMs will be used for SIMS and EPMA purposes.
The thesis project has the following aims:
• Determination of the implantable set of elements by using the available filters
• Calculation of the implantation parameters
• Experimental test of these parameters with selected combinations element – concentration – implantation depth
• Test of the implantation by means of SIMS and EPMA

Department: Analytics

Contact: Dr. Renno, Axel

Requirements

• You study physics, material's sciences or engineering
• You are interested in mineralogical or analytical problems
• You are interested in modern analytical techniques
• You show initiative and good teamwork skills

Conditions

Start immediately
project period in accordance withe respective study regulations (est. 6 month)

Links:

Online application

Please apply online: english / german

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Image processing to determine the size and velocity distribution of drops in annular flows (Id 217)

Bachelor theses / Master theses / Diploma theses

Foto: graphical abstract student position ©Copyright: Paul PorombkaThe modelling of disperse two-phase flows in Computational Fluid Dynamics is the subject of a current research project of the Institute of Fluid Dynamics at the HZDR. To validate these numerical methods, image data were obtained from experiments on horizontal droplet flows of air and water (refer to Figure).
For the comparison with the simulation the image data is to be automatically evaluated with regard to size and speed distributions.
Existing program libraries (ImageJ/Fiji, SciKit-Image, Matlab Image Processing Toolbox) are to be used for this purpose.
To support this work we are searching for student assistant. The candidate will be responsible for the following tasks:

• literature study on noise filtering and edge detection techniques
• preprocessing of image data (background subtraction, normalisation, noise filtering)
• edge detection and determination of drop size / velocity
• binning and averaging to calculate distribution functions
• validation of the method by means of image data of particles of known size
• documentation of the results

Requirements of the respective university can be accounted for after consultation.

Department: Computational Fluid Dynamics

Contact: Porombka, Paul

Requirements

• interest in fluid mechanics , especially multiphase flows
• good command of a programming/scripting language (preferably Python, Java, Matlab)
• ideally experienced in the field of image processing

Conditions

• duration: 4-6 months
• start date: as of now
• compensation for expenses

Online application

Please apply online: english / german

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Entwicklung einer Handsteuerung für Kondensatorladegeräte (Id 216)

Student practical training

Foto: Display ©Copyright: Nick WinklerDie Handsteuerung eines Kondensatorladegerätes soll modernisiert werden. Das Kondensatorladegerät wird zur Untersuchung von Materialeigenschaften verwendet und erzeugt hohe Spannungen für das Laden von Kondensatoren.

Die Entwicklung der Handsteuerung beinhaltet unter anderem folgende Themen:
- Hardwareentwicklung (Schaltungsentwurf)
- Spezifikation/Recherche von Gehäuse-Optionen
- Softwareentwicklung (Mikrocontroller, Ansteuerung Display)

Institute: Department of Research Technology

Contact: Winkler, Nick, Wagner, Nicole

Requirements

- Grundkenntnisse Elektrotechnik
- Grundkenntnisse C

Online application

Please apply online: english / german

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Beiträge zur Weiterentwicklung der ultraschnelle Röntgencomputertomografie (Id 212)

School practical training / Master theses / Diploma theses

Die im Institut für Fluiddynamik am HZDR entwickelte Ultraschnelle Röntgencomputertomografie wird bei der Beforschung von Strömungsvorgängen auf einer Vielzahl von Themengebieten als berührungsloses, bildgebendes Messverfahren genutzt. Dabei wird mit Hilfe eines freien Elektronenstrahls, der durch Magnetfelder im Vakuum geführt wird, eine um das Messobjekt rotierende Röntgenstrahlungsquelle erzeugt. Aus den vom Detektor synchron aufgenommenen Projektionsdatensätzen werden 2D-Schnittbildsequenzen der Schwächungsverteilung im Messobjekt mit hoher räumlicher und sehr hoher zeitlicher Auflösung generiert. In den letzten Jahren wurden die bestehenden ROFEX-Scanner stetig verbessert. Gleichwohl besteht Entwicklungspotential im Bereich des Monitorings der Röntgenquellposition, d.h. des Fokuspunkts des Elektronenstrahls, da dieser sehr empfindlich auf Störeinflüsse, wie zum Beispiel parasitäre Magnetfelder, reagiert. Schlussendlich wäre eine aktive, dynamische Nachjustage des Elektronenstrahls das Entwicklungsziel.
Im Rahmen dieser Arbeit sollen zunächst Konzepte für ein in-situ Strahlbahnmonitoring entwickelt und bewertet werden. Für das erfolgversprechendste Konzept soll ein Realisierungsvorschlag bis hin zur Auslegung notwendiger Komponenten erarbeitet werden. Ein praktischer Test ist wünschenswert, wenn in der Zeit möglich.

Teilaufgaben:
• Theoretische Entwicklung der Monitoring-Konzepte / Literaturstudium
• Grundsätzliche Berechnungen; evtl. Simulationen
• Aufbau eines Demonstrators bzw. Test am ROFEX-Scanner

Infos zu ROFEX-Scanner: https://www.hzdr.de/db/Cms?pOid=30242&pNid=0

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Barthel, Frank

Requirements

• Studium der Elektrotechnik/Physik/Maschinenbau
• Strukturierte, selbstständige Arbeitsweise
• Technische Kreativität und Gestaltungswille
• Fundierte Kenntnisse in Automatisierung und Konstruktion

Online application

Please apply online: english / german

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Beiträge zu innovativen Konzepten für die ultraschnelle Röntgencomputertomografie (Id 211)

Student practical training / Master theses / Diploma theses

Die im Institut für Fluiddynamik am HZDR entwickelte Ultraschnelle Röntgencomputertomografie wird bei der Beforschung von Strömungsvorgängen auf einer Vielzahl von Themengebieten als berührungsloses, bildgebendes Messverfahren genutzt. Dabei werden aus Projektionsdatensätzen 2D-Schnittbildsequenzen mit hoher räumlicher und sehr hoher zeitlicher Auflösung generiert. In den letzten Jahren wurden die bestehenden ROFEX-Scanner stetig verbessert. Gleichwohl besteht ein hohes Entwicklungspotenzial im Bereich der Röntgenstrahlungserzeugung.
Im Rahmen dieser Arbeit sollen Schlüsselexperimente auf dem Gebiet der schnell gepulsten Röntgenstrahlungserzeugung geplant und durchgeführt werden.

Teilaufgaben:
• Literaturstudium zu gesteuerter bzw. provozierter Feldemission
• Grundsätzliche Berechnungen; evtl. Simulationen
• Aufbau eines Demonstrators und Experimente zur getakteten Erzeugung von Röntgenstrahlung

Infos zu ROFEX-Scanner: https://www.hzdr.de/db/Cms?pOid=30242&pNid=0

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Barthel, Frank

Requirements

• Studium der Elektrotechnik/Physik/Maschinenbau
• Strukturierte, selbstständige Arbeitsweise
• Technische Kreativität und Gestaltungswille
• Konstruktionsfähigkeiten

Online application

Please apply online: english / german

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Optimization of the design and the operation of liquid metal batteries (Id 205)

Student practical training / Bachelor theses / Master theses / Diploma theses / Compulsory internship

Foto: Study of a liquid metal battery module ©Copyright: Dr. Michael Nimtz, ©Michael NimtzIn contrast to conventional batteries, Liquid Metal Batteries feature all liquid anodes (alkaline or alkaline earth metal), cathodes (transition metal or metal) and electrolytes (molten salts) at a temperature between 400 °C and 600 °C.
The technical design of a liquid metal battery system (elctrodes, electrolyte, current collector, cell container and electrical and mechanical connections) and the operational parameter of such a system are connected in a complex manner and need to fulfil a number of auxiliary conditions.
For such a system, a multi-objective optimization shall be implemented and applied. He goal is to optimize the whole system in terms of energy efficiency, material usage and overall size for arbitrary power ratings/capacities and different load cycles.
Starting point is an existing model of a battery system in Python.

Department: Magnetohydrodynamics

Contact: Dr. Nimtz, Michael, Dr. Weier, Tom

Requirements

Study of mechanical engineering, physics, mathematics or similar
Basic knowledge of engineering principles.
Good knowledge of a programming language, preferably python.

Conditions

Start: from now
Duration: 4-6 months

Links:

Online application

Please apply online: english / german

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Looking for treasures inside rocks: from 2D to 3D (Id 204)

Bachelor theses / Master theses / Diploma theses

Foto: 3D visualization of a sulfide vein with disseminated gold ©Copyright: HZDR/ Jose Godinho2-dimensional imaging of surfaces is the preferred method to analyse the microstructure of rocks for industrial and academic research. The main advantages of 2D imaging are the high resolution and the possibility to analyse the chemical and phase composition of surfaces. However, it is inaccurate to extrapolate bulk quantitative information from the inside of a rock based on just looking at its surface.
This project aims to develop the first experimental procedures to correlate quantitative 3D imaging (computed tomography, CT) with high resolution chemical 2D imaging (e.g. electron microscopy, SEM / MLA, and spectroscopy). You will gain hands on experience on these techniques and sample preparation. You are expected to develop the experimental workflow and to optimize the image analysis to achieve the best correlation between 2D and 3D imaging. This correlation will allow you to identify the valuable minerals and their 3D properties inside rocks from mining sites and ore processing plants.

Department: Analytics

Contact: da Assuncao Godinho, Jose Ricardo, Dr. Renno, Axel

Requirements

- Student of geology, mineralogy, material sciences or related areas
- Good spoken and written English
- Enthusiasm for experimental lab. work
- Creativity and desire to do new things

Conditions

- start any time

Links:

Online application

Please apply online: english / german

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Programmierung einer Tellerradsteuerung mit TwinCAT 3 (Id 203)

Student practical training / Bachelor theses

Foto: LE-Implanter 1Am Zentrum für Ionenstrahlphysik wird eine bestehende Implantationskammer modernisiert. Für die Instrumentierung wird ein Steuerungssystem der Firma Beckhoff verwendet, welches eine Vakuumsteuerung und die Steuerung eines Tellerrades mit einem Servo-Motor realisieren soll.
Die Arbeit umfasst u.a. folgende Themen:
- Einbindung von Anlagen-I/O in die Steuerung
- Programmierung von Abläufen für das Vakuum
- Ansteuerung des Motors und Anfahren von dedizierten parametrierbaren Positionen
- Realisierung einer benutzerfreundlichen Visualisierung direkt auf der Steuerung
- Test und Inbetriebnahme der Steuerung

Institute: Department of Research Technology

Contact: Wagner, Nicole

Requirements

- Grundlagen der Automatisierungstechnik
- Programmiererfahrung im Bereich SPS-Steuerungen (vorzugsweise TwinCAT)

Conditions

- Bearbeitungszeit: 4-6 Monate
- Beginn: ab sofort

Online application

Please apply online: english / german

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Analysis of Liquid Metals by Laser Induced Breakdown Spectroscopy LIBS (Id 202)

Student practical training / Bachelor theses / Master theses / Diploma theses / Compulsory internship / Volunteer internship

The expansion of renewable energies requires innovative systems for the efficient storage and conversion of energiy. The HZDR investigates how liquid metals can be used in Liquid Metal Batteries (LMB) and thermoelectric converters (Alkali-Metal Thermo-Electric Converter – AMTEC). These system are promising candidates for future grid storages and waste heat utilisation, respectively.
In both systems, metal alloys and intermetallic phases of reactive alkali metals (lithium, potassium, sodium) are formed. Within this work, these alloys will be analysed and characterised by LIBS (Laser Induced Breakdown Spectroscopy). LIBS is a type of emission spectroskopy, where laser ablated and excited sample particles are analysed. The aim is to determine the cell performance on the basis of the state of charge and health, respectively, and derive corresponding measures for optimisation.

Work packages include:
- Characterisation of measured spectra by multivariate analysis
- Development of a suitable evaluation tool
- Preparation of reference samples and analysis of reproducibility
- Method development for sample taking and preparation

Department: Magnetohydrodynamics

Contact: Dr. Kubeil, Clemens, Dr. Weier, Tom

Requirements

• Interest in scientific and experimental work
• Knowledge of analytical techniques (ideally emission spectroscopy)
• Knowledge of spectra evaluation / multivariate analysis / progamming
• Good to very good marks

Conditions

• Starts April/May 19
• Duration: 3-6 months
• Only application with CV and certificates will be considered

Online application

Please apply online: english / german

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Simulation of ion optical behaviour of ions in the mass range between 1 and 300 amu during coupling of a SIMS instrument with a tandem accelerator (Id 200)

Master theses / Diploma theses

Actually, a Super-SIMS-Set-up is developed at the HZDR Ion Beam Centre (IBC) by connecting a conventional SIMS-source (SIMS = Secondary ion mass spectrometry) to a 6 MV tandem accelerator. Due to the acceleration of the extracted secondary ions to MeV-energies and their charge reversal from negative to positive ions, Super-SIMS can reach about 2 to 3 orders of magnitude lower detection limits (up to 10-12 or ppt, highly depending on analyte and matrix) as conventional SIMS.
The CAMECA 7fauto SIMS spectrometer is coupled by means of a 30 kV potential to the 6MV tandem accelerator. This potential is needed to fulfil the acceptance conditions of the accelerator. The beam transfer from the SIMS, seen as an ion source, to the entrance lens differs individually for every type of ion (mass and energy) and needs to be studied systematically.
The aim of the thesis is a systematic survey of all possible negative secondary ions (masses 1 – 300) in the energy range of the connection ion optics. The method of simulation will be SIMION® (http://simion.com/) an ion optical modelling and calculation software.

Department: Analytics

Contact: Dr. Renno, Axel, Dr. Rugel, Georg

Requirements

• interest in modern analytical techniques
• student of physics
• experiences in simulation calculations
• You show initiative and good teamwork skills

Conditions

start: immediately

Links:

Online application

Please apply online: english / german

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Ion beam transport calculations for Super-SIMS project (Id 199)

Master theses / Diploma theses

Actually, a Super-SIMS-Set-up is developed at the HZDR Ion Beam Centre (IBC) by connecting a conventional SIMS-source (SIMS = Secondary ion mass spectrometry) to a 6 MV tandem accelerator. Due to the acceleration of the extracted secondary ions to MeV-energies and their charge reversal from negative to positive ions, Super-SIMS can reach about 2 to 3 orders of magnitude lower detection limits (up to 10-12 or ppt, highly depending on analyte and matrix) as conventional SIMS. To understand and optimize the ion-optics needed for these challenging project calculations should be performed. All the existing hardware at the IBC, like einzel lenses, quadrupoles, magnets have to be implemented in the calculation. The tool to perform and visualize the ion optic calculations will be LIMIOPTIC (www.limioptic.de), which was built for the CologneAMS (http://www.cologneams.uni-koeln.de/) system similar to the setup DREAMS at the IBC. The results of these calculations have to be compared with real machine settings and used for improvement of the transmission parameters of the whole system.

Department: Analytics

Contact: Dr. Renno, Axel, Dr. Rugel, Georg

Requirements

• interest in modern analytical techniques
• student of physics
• experiences in simulation calculations
• You show initiative and good teamwork skills

Conditions

start: immediately

Links:

Online application

Please apply online: english / german

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Simulation of the critical time line of ions in the mass range between 1 and 300 amu in a Super-SIMS setup (Id 198)

Master theses / Diploma theses

Actually, a Super-SIMS-Set-up is developed at the HZDR Ion Beam Centre (IBC) by connecting a conventional SIMS-source (SIMS = Secondary ion mass spectrometry) to a 6 MV tandem accelerator. Due to the acceleration of the extracted secondary ions to MeV-energies and their charge reversal from negative to positive ions, Super-SIMS can reach about 2 to 3 orders of magnitude lower detection limits (up to 10-12 or ppt, highly depending on analyte and matrix) as conventional SIMS.
The basis for a coordinated control software between ion source (SIMS instrument), accelerator and the detectors of the high-energy mass spectrometer is a sound knowledge of the flight time of ions in the mass range between 1 and 300 amu and the complete energy range on the low and high-energy side.
The aim of the thesis is the establishment of a small software tool which allows the simulation of the critical time line of given ions in a broad range of ion optical conditions. The simulation should base on ion optical simulations done with the LIMIOPTIC (www.limioptic.de) and SIMION® (http://simion.com/) codes.
It is the intention that the software tool runs either independently or could be integrated in the future control software of the Super-SIMS.

Department: Analytics

Contact: Dr. Rugel, Georg

Requirements

• interest in modern analytical techniques
• student of physics or informatics
• programming skills
• You show initiative and good teamwork skills

Conditions

start: immediately

Links:

Online application

Please apply online: english / german

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Smart actuation system for flow following µAUV particles for industrial process environments (Id 175)

Master theses / Diploma theses / Compulsory internship

Foto: flow following sensor particle ©Copyright: Dr. Sebastian ReineckeSmart flow following sensor particles are used for acquisition of spatially distributed process parameters in industrial processes, such as biogas digesters, waste water treatment basins or bioreactors. The aim of the work is the development of an actuator concept for sensor µAUV-particles for the automatic adjustment of buoyancy (buoyancy) and for buoyancy maneuvers under the condition of small size, minimum energy consumption and high reliability. For this, alternative physical and chemical mechanisms should be considered based on the existing electromechanical solution. There are suitable variants to implement and test. Furthermore, the development of sensor intelligence for the actuators in the sensor particles is an essential part of the task. The developed concepts have to be validated experimentally.

We cordially invite you to an on-site conversation to introduce the topic and to agree on further details. Do not hesitate to contact us, because the way is worth it for you.

What can you expect:

In our department, we offer you an attractive work environment to expand your personal and professional skills. The insight into the diverse R&D projects of the department in the areas of sensor and measuring technology as well as energy and process engineering (among others) and the excellent technical equipment of the laboratories offer optimal conditions for this. The possibility of close contact with competent experienced colleagues plays a central role. As part of student work, we have pursued the approach of structured supervision and associated constructive feedback. This includes regular meetings with your supervisor and intermediate presentations in the form of informal "workshop reports" in the extended audience of interested individuals of the department in order to optimally support you in the successful completion of your project. Furthermore, we are open to support outstanding candidates in their continuing academic qualification, such as in doctoral scholarships or in current or upcoming R&D projects.

Subject-related task spectrum:

• Establishment of the scientific and technical principles of mechanical, physical and chemical principles of action for embedded, actuating components
• Concept development for actuators for taring of sensor particles
• Development of sensor intelligence for situation-dependent, automatic buoyancy, for buoyancy maneuvers and for recovery
• Selection, purchase/ composition and comparison of solution variants
• Minimization of size and energy consumption
• Increased reliability when used in particle-loaded biological substrates
• Development of firmware taking into account existing function routines based on an embedded system with 32-bit data structure (e.g. STM32)
• Conception and realization of suitable test scenarios
• Characterization and comparison of implemented variants with regard to accuracy of taring and reliability in long-term use

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Reinecke, Sebastian

Requirements

• Studies in electrical engineering, mechatronics, mechanical engineering and similar engineering courses
• Experience in design and (micro) actuator systems
• Experience in programming microcontrollers for embedded systems (e.g. STM32)
• Experience in control electronics for microdrives and board design for embedded systems
• Fundamentals of (micro) actuator systems, movement of rigid bodies, measurement uncertainties, digital signal processing
• Data analysis optionally in Matlab, Octave or C / C ++
• Independent, self-responsible working method

Links:

Online application

Please apply online: english / german

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Development of new absorber layers for concentrated solar tower plants (Id 173)

Bachelor theses / Master theses / Diploma theses

Foto: solar power plant by Abengoa ©Copyright: AbengoaTurmkraftwerke stellen die neueste Generation von Anlagen zur solarthermischen Elektroenergieerzeugung dar. Extrem konzentriertes Sonnenlicht wird dabei auf einen zentralen Absorber gerichtet, der die Wärme auf eine Wärmeträgerflüssigkeit überträgt. Zur Erhöhung des Wirkungsgrades von Turmkraftwerken muss die Arbeitstemperatur des Wärmeträgers von derzeit maximal 550°C auf 800°C erhöht werden. Dafür benötigt man neuartige Absorberschichten, deren Funktionalität unter den herrschenden Bedingungen 25 Jahre lang erhalten bleibt.

Inhalte dieser Abschlussarbeit sollen primär die gezielten PVD-Abscheidungen und deren Charakterisierungen mit modernsten in situ und ex situ Analysemethoden sein. Zur Abscheidung stehen verschiedene PVD-Verfahren zur Verfügung.

Department: Nanocomposite Materials

Contact: Dr. Krause, Matthias

Requirements

1. Studium der Werkstoffwissenschaften, Physik oder Chemie
2. Interesse und Freude an experimenteller wissenschaftlicher Arbeit
3. Gute Kenntnisse in Programmierung und Datenverarbeitung
4. Fließendes Englisch

Conditions

Beginn: 1.1.2018 (frühestens), internationale Forschungsumgebung, ortsübliche Aufwandsentschädigung

Die Arbeit wird im Rahmen eines EU-RISE-Projektes (GA 645725) in Zusammenarbeit mit 4 Partnern im EU-Ausland angefertigt.

Online application

Please apply online: english / german

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Liquid flow characterization on distillation column trays (Id 169)

Student practical training / Master theses / Diploma theses / Student Assistant

Distillation is highly important in chemical process industries, as 95% of the worldwide separations use this technology in large industrial columns. Increasing energy costs and higher awareness for environmental concerns motivate towards the optimization of the performance of tray columns. Flow and mixing patterns in the tray columns have strong influence on their separation performance. Plug flow is considered ideal, while any deviations from plug flow are referred as non-idealities that are detrimental to the tray efficiency.
Mathematical models are used to assess the flow patterns and predict the tray efficiency. For this purpose, precise identification of the flow patterns and the hydraulic parameters at high spatio-temporal resolution is a prerequisite. An in-house developed sensor specifically designed for the cross-flow trays will be used in three-dimensional framework. Proper sensor calibration and data processing is essential for the accuracy of the measurements. Further, the flow visualization and determination of the hydraulic parameters need to be achieved through MATLAB scripts.

Department: Experimental Thermal Fluid Dynamics

Contact: Vishwakarma, Vineet

Requirements

1. Academic studies in chemical engineering, process engineering or similar field, with reasonable understanding of mathematics and distillation columns.
2. Enthusiasm for experimental work, with good interpersonal skills.
3. Programming skills: MATLAB.

Conditions

The candidate can start at the earliest. The duration of the project can be up to 6 months. The candidate will be invited for interview and discussion, or may be asked to give a short presentation before the selection.

Links:

Online application

Please apply online: english / german

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Entwicklung eines digitalen Lock-in-Verstärkers auf FPGA-Basis (Id 166)

Student practical training

Foto: Lock-in amplifier ©Copyright: Bert LangeDas Prinzip des Lock-In-Verstärkers erlaubt es empfindliche Messgeräte zu realisieren. Im vorliegenden Projekt soll die Umsetzung auf Basis digitaler Signalverarbeitung im FPGA erfolgen. Dabei sollen u.a. Erfahrungen bezüglich erreichbarer Performance und des nötigen Implementierungsaufwandes gewonnen werden.

Institute: Department of Research Technology

Contact: Lange, Bert

Requirements

- Studium der Elektrotechnik oder Informatik
- Interesse an digitaler Signalverarbeitung
- Grundkenntnisse im Einsatz von FPGAs
- Grundkenntnisse VHDL erforderlich

Online application

Please apply online: english / german

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Bestimmung von Geschwindigkeitsfeldern aus tomographischen Bilddaten mittels Kreuzkorrelation (Id 164)

Bachelor theses / Master theses / Diploma theses

Foto: ROFEX CAD ©Copyright: Dr. Frank BarthelAm Institut für Fluiddynamik am Helmholtz-Zentrum Dresden-Rossendorf sind zahlreiche Messverfahren für die Untersuchung von Mehrphasenströmungen entwickelt worden. Eines davon ist die ultraschnelle Elektronenstrahl-Röntgen-Computertomographie, welche mit Aufnahmeraten von bis zu 8000 Bildern pro Sekunde eine dedizierte Aufklärung von Strömungsstrukturen erlaubt. Aufgrund der quasi simultanen Aufnahme von Bilddaten aus zwei Messebenen ergibt sich zudem die Möglichkeit, axiale Geschwindigkeiten zu bestimmen, wofür üblicherweise Kreuzkorrelationsverfahren verwendet werden. Im Rahmen dieser Arbeit sollen die Möglichkeiten dieser Methodik in Hinblick auf die Bestimmung von Geschwindigkeitsfeldern in verschiedenen Strömungsszenarienn analysiert werden.

Folgende Teilaufgaben sind zu lösen:
• Studie zu verschiedenen Varianten der Kreuzkorrelation
• Simulation verschiedener Szenarien und Bewertung der Genauigkeit
• Übertragung der Ergebnisse auf reale Messungen

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Bieberle, Martina

Requirements

• Studium der Informatik, Mathematik oder einer Ingenieurwissenschaft
• Interesse an Messverfahren und Datenanalyse
• Selbständiges Arbeiten

Conditions

Bearbeitungszeit 4 bis 6 Monate

Links:

Online application

Please apply online: english / german

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Untersuchungen zur Steigerung der Energieeffizienz von Belüftungselementen für die Anwendung in der biologischen Abwasserreinigung (Id 154)

Student practical training / Bachelor theses / Master theses / Diploma theses / Student Assistant

Foto: SEBAK setup and aerators ©Copyright: Robert Herrmann-HeberDie biologische Abwasserbehandlung leistet einen wesentlichen Beitrag zum Erhalt der Gewässerqualität. Im kommunalen Bereich entfällt ein großer Anteil des Gesamtenergiebedarfs auf die Kläranlagen. In diesen Anlagen wird oft mehr als 50 % der elektrischen Energie für den Eintrag von Luft in Belebungsbecken benötigt, in denen Mikroorganismen die im Abwasser enthaltenen Nährstoffe unter Verbrauch von Sauerstoff zersetzen.
Nach aktuellem Stand der Technik wird die Luft durch Belüftungselemente wie Membran- oder Keramikbelüfter eingetragen. Ein Teil der für den Lufteintrag benötigten Energie wird entweder für die Dehnung der schlitzförmigen Öffnungen der Membranen oder zur Überwindung des Strömungswiderstandes in der Keramikwand aufgewendet.
Neue Konzepte sollen diesen Energiebedarf reduzieren und für einen optimierten Sauerstoffeintrag in das Belebungsbecken sorgen.

Department: Experimental Thermal Fluid Dynamics

Contact: Herrmann-Heber, Robert

Requirements

• Studium im Bereich Verfahrenstechnik, Chemie-Ingenieurwesen und ähnlichen Ingenieurstudiengängen
• Freude am experimentellen Arbeiten

Conditions

• 4-6 Monate
• Ab September/Oktober

Online application

Please apply online: english / german

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Student assistant at the DeltaX School Lab (Id 95)

Student Assistant

Foto: SommerferienForscherWoche im Schülerlabor DeltaX ©Copyright: HZDRDas Schülerlabor DeltaX macht die Forschung am Helmholtz-Zentrum Dresden-Rossendorf für Schülerinnen und Schüler erlebbar. Für ihre Betreuung und Unterstützung beim Experimentieren suchen wir Studierende, die Freude an der Vermittlung von Naturwissenschaften, Forschung und Technik haben. Bewerben Sie sich als studentische Hilfskraft im Schülerlabor DeltaX und werden Sie Teil eines jungen und aufgeschlossenen Teams.

Das Schülerlabor DeltaX bietet Schulklassen Experimentiertage zu den Themen:
- „Licht und Farbe“ (Klassen 5-10)
- „Magnetismus und Materialforschung“ (ab Klasse 10)
- „Radioaktivität und Strahlung“ (ab Klasse 9)
- NEU ab dem SJ 2019/2020 - Biologie und Chemie (ab Klasse 10)

Department: Communication & Media Relations

Contact: Dr. Streller, Matthias, Gneist, Nadja

Requirements

- Studium eines naturwissenschaftlichen Faches
- Verbleibende Studiendauer mind. 2 Semester
- Freude an der Vermittlung von Naturwissenschaften und Forschung
- Gute bis sehr gute Noten

Conditions

- 5 - 10 h / Woche an ganzen Wochentagen
- Beginn der Einstellung nach Vereinbarung

Links:

Online application

Please apply online: english / german

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Untersuchung des Einflusses von Regularisierungsmethoden auf Bildrekonstruktionsalgorithmen (Id 57)

Student practical training / Bachelor theses / Master theses / Diploma theses

Bei der tomographische Bildrekonstruktion muss ein diskretes inverses Problem gelöst werden, wofür algebraische Methoden wie zum Beispiel ART und CG-Verfahren verwendet werden können. Dabei spielt die Regularisierung, die den Einfluss von Diskretisierungsfehler und Messdatenrauschen auf die Lösung beschränkt, eine entscheidende Rolle. Deren Einfluss auf die Bildrekonstruktion von Röntgen- und Gamma-CT-Messdaten soll untersucht werden. Dazu sind folgende Teilaufgaben zu lösen:
• Implementierung verschiedener Regularisierungsmethoden
• Anwendung der Programme auf Messdaten
• Parameterstudien um die Regularisierungsmethoden für die Messdatensätze zu optimieren.

Department: Experimental Thermal Fluid Dynamics

Contact: Wagner, Michael, Dr. Bieberle, Martina

Requirements

• Programmierkenntnisse in MATLAB
• Grundkenntnisse zur numerischen Behandlung linearer Gleichungssysteme

Links:

Online application

Please apply online: english / german

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