TAPS 2020 program is postponed to summer 2021 due to COVID-19 pandemic.

TAPS 2020 projects

The main component of the summer program is an active participation in the selected Science research project offered by the staff members of the Nicolaus Copernicus University, please see the topics and their descriptions below. Interested students are welcome to contact possible advisors for more details concerning the foreseen projects and discuss the dates that the project could be undertaken.

Astronomy / Astrophysics:

Automatics and robotics:

Computer science:

Physics:


Astronomy / Astrophysics

IRX-M* relation out to redshift ~7


Most high-redshift galaxies lack infrared (IR) detections, tracing dust emission, due to the low resolution of single-dish IR telescopes or small field of view of IR interferometers. We, therefore, have to utilise indirect methods in order to account for the dust, which is crucial mainly for the correct estimates of the star formation rates (SFRs). One of the the main such methods involves determining the IR emission from the stellar mass of a given galaxy via the so-called IRX-M* relation. Problem is, it is not known whether this relation undergoes any redshift evolution. This project involves stacking 100k's of optically-selected galaxies in the far-IR Herschel/SPIRE and JCMT/SCUBA2 UDS maps in stellar mass bins, in order to investigate various dust properties of high-redshift galaxies and their evolution with redshift. The properties, depending on the efficiency of the student, will involve dust temperature, mass, IR luminosity, SFRs and, ultimately,IRX-M* relation. The student will gain experience in working with large data sets, stacking methods, deriving galaxy properties from fitting models to data and interpreting their results in order to understand galaxy evolution properties in the Universe. The basic knowledge of python will be an advantage, but is not a prerequisite.

Supervisor: Maciej Koprowski (mkoprowski[at]fizyka.umk.pl)
Time: 01.07 – 28.07

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Optically thick globules in the solar vicinity


Interstellar medium (ISM) as an important component of the Milky Way system started to be considered in 1930 from the works of Trumpler who connected the observed optical thickness of interstellar clouds with the presence of dust particles. The interstellar absorptions are usually observed in spectra of young, massive, early type stars where stellar lines are scarce. Moreover, the above-mentioned stars are intrinsically bright which makes feasible their observations at long distances – probability of intersecting a cloud by a sightline grows with distance. However, very distant objects likely shine through several separate clouds which may be of different physical parameters (different spectra). This project is related to investigations of interstellar absorption lines or bands.
Bright and hot star (an object from the top of Main Sequence at the Hertzsprung-Russel diagram) is usually a „source of continuous spectrum”. Such objects are scarce in our Galaxy (Milky Way) but can be observed at very large distances. „Cloud of gas” is composed mostly of hydrogen and helium but about 1% of its mass is the dust. The latter causes the observed continuous extinction (colloquial: reddenening) of the observed star while the gas carries observed absorption lines and bands (the clouds contain a wealth of molecules). The massive stars are rapidly evolving objects and thus – young. One can expect in their spectra some effects of interstellar as well as circumstellar (relic) matter. Moreover, along very long sightline one can observe several absorbing clouds.
Our recent survey of Galactic reddened stars done with the aid of UVES spectrograph fed with the 8m Kueyen telescope (member of VLT) allows to select and investigate several late B type stars, likely obscured by single, geometrically small and likely homogeneous, interstellar clouds. These clouds are unlikely parts of the stellar parent clouds and thus their physical parameters may be deciphered. Thus such objects are very interesting and should be investigated as broadly as possible, so they will be a subject of study during this project.

Supervisor: Jacek Krełowski (jacek[at]umk.pl)
Andrzej Strobel (strobel[at]umk.pl)
Time: 06.07 – 31.07

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Polarimetry of stars with circumstellar disks


The project aim is to study polarimetrically a sample of stars with known circumstellar disks (protoplanetary disks, debris disks, etc.) by using the two Savart plates. The Savart plates are mounted on the filter wheel integrated with the CCD SBIG camera STL 11000M on the 0.9-m Schmidt-Cassegrain telescope (TSC90). For much brighter targets, it is also possible to use the same Savart plates, and CCD camera mounted on the 20-cm telescope (T20). The telescopes are located in the Institute of Astronomy of the Nicolaus Copernicus University, 15 km to the North from Toruń.
The main objective is to determine polarization degree (PD) and polarization angle (PA) for sample stars. It is expected that the stars show higher PD since circumstellar dust scatters incident light from the host star and generates non-zero polarization of that light. The target sample were selected from the catalogue of stars with circumstellar disks (https://www.circumstellardisks.org) based on their visibility on the sky, distance and magnitude range (4 < R< 15 mag). Also, the stars present a broad range of spectral types (B-K). All of this allows comparing the observational parameters with the literature data. Moreover, the applicant will develop polarimetric data reduction and calibration algorithms and analyze the influence of the interstellar medium (ISM) towards the stars on the observed PD of the star's light.
The successful applicant will perform photopolarimetric observations, data analysis and calibration of the instrument. The calibration will be based on the observations of zero polarized and highly polarized standard stars. During the project, the scientific data will be taken and analyzed with used of the delivered calibration parameters. Interest in the optical observations, data processing and excellent programming skills are required.

Supervisor: Agnieszka Słowikowska (aga[at]umk.pl)
Co-supervisors:Paweł Zieliński (pzielinski[at]astrouw.edu.pl, Astronomical Observatory, University of Warsaw)
Time: 05.07 – 01.08

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Full automatization of the telescope in the second dome of the astronomical observatory of the Institute of Astronomy of NCU in Toruń


The project aim is to fully automatize the telescope, its mount, the dome and the dome slit in the second dome of the astronomical observatory of the Institute of Astronomy of the Nicolaus Copernicus University in Toruń (https://www.ca.umk.pl/en/science/instrumentarium/).
The dome/slit system needs to be controlled by the MaximDL software (https://diffractionlimited.com/help/maximdl/MaxIm-DL.htm) through the ASCOM driver (https://ascom-standards.org/). The communication between the dome and the MaximDL is via port RS232. Additionally, after the upgrade of the GM4000 mount to the GM4000HSP also the mount should be connected to the MaximDL.
At the end of the project, the possibility of running the observing scripts should be achieved. Excellent programming and communication skills are required.

Supervisor: Agnieszka Słowikowska (aga[at]umk.pl)
Co-supervisors:Paweł Zieliński (pzielinski[at]astrouw.edu.pl, Astronomical Observatory, University of Warsaw)
Time: 05.07 – 01.08

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Automatics and robotics

Control of a delta-type parallel kinematics machine using LinuxCNC and EtherCAT


The purpose of this project is to adapt an existing control system to control a multi axis machine with delta type parallel kinematics. Main machine controller is implemented on a PC with a real-time Linux operating system (RT-Preempt kernel) and LixnuCNC machine control software. EtherCAT fieldbus master stack is also implemented for real-time communication with the motor controller. The multi axis stepper motor controller generates control signals for the machine motors (step/dir) and interfaces with other machine elements such as limit sensors based on periodic EtherCAT commands received from the PC. Because the machine has a non-cartesian kinematic configuration an inverse kinematics transformation module will have to be developed and implemented between the LinuxCNC software and the EtherCAT stack. The EtherCAT stack is the IGH EtherCAT master stack and was previously tested to work with LinuxCNC and RT-Preempt kernel.
  1. Installation of real-time Linux (RT-Preempt), LinuxCNC and EtherCAT stack on a PC
  2. Testing of EtherCAT communication with the motor controller using i/o and free running motors
  3. Implementation of an inverse kinematics transformation module in C between the LinuxCNC software and the EtherCAT stack
  4. Testing and performance investigation of the system with the delta machine connected, some further modifications if necessary
Supervisor: Krystian Erwiński (erwin[at]fizyka.umk.pl)
Time: 01.07 – 29.07

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Implementation of the RTIG algorithm in SoC architecture


Since last 10 years, many different techniques of using Tapped Delay Lines (TDL) to construction of various types the Time-to-Digital Converters (TDC) implemented in Field-Programmable-Gate-Array (FPGA) structures have been observed. As long as, the precision of TDCs largely depends on quantization parameters, then it is necessary to seeking the new solutions aiming to increase the TDLs resolution and accuracy. Due to the rapid development of microelectronic technology and quick prototyping makes the new series of highest performance FPGAs is a very interesting solution for future investigations. One of the possible testing methods of above systems is a precise and fast generating of the reference time intervals (RTI) and sending them into the TDC. The final verification is obtained by comparing the reference time intervals with the results obtained from the measurement process. Properly generated RTIs provide the ability to modelling of any physical phenomena and control of the process intensity. Meeting the above assumptions will be possible through implementation of the reference time-interval generation (RTIG) functionality in the SoC structure.
The research goal is to increase the efficiency of the RTIG process by implementing such functionality in the SoC structure. The student will acquire knowledge of at least one or more research tasks:
Supervisor: Robert Frankowski (robef[at]umk.pl)
Time: 15.06 – 12.07

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Generating the main parameters of the envelope function for the time interval generating system


High resolution time interval measurement systems implemented in programmable FPGA structure consist of such modules: the tapped delay line, the code converter, memory modules and the communication interface. In such systems, high resolution depends on the tapped delay line. The line parameters such as resolution, differential nonlinearity, integral nonlinearity is obtained in a variety ways. Knowing these parameters, you can enter the nonlinearity correction to improve the result of the time interval measurement. In this way, we minimize the time interval measurement error associated with these parameters. To check how well the correction has been made, the comparison between the time interval results obtained in measurement process and the time intervals with a known time distribution (the envelope function) should be performed. Therefore, it is necessary to determine the parameters (mean, standard deviation), of normal distribution functions which will be used to interpolate the given envelope function and send them to the time interval generation system.
The student will have the opportunity to learn the methods of data analysis and interpolation of functions with a given distribution using the function of normal distribution, as well as interfaces enabling communication between a desktop computer and the system implemented in the FPGA structure.

Supervisor: Marcin Kowalski (markow[at]fizyka.umk.pl)
Time: 15.06 – 12.07

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Application for communication with a mobile robot in a QT environment


The student will be involved into a project related to mobile robotics. The main task is the development of a PC application dedicated for data exchange between a mother station and a mobile robot. The project should be realized in QT environment, employing TCP/IP communication protocol. The control panel should be equipped in several status indicators and displays, enabling the two way communication with the robot. The exchanged data should contain: status information about the mobile platform and commands to the robot controller. The application should be able to save the received data into a predefined file format on the hard disk of the mother station.

Supervisor: Łukasz Niewiara (lukniewiara[at]umk.pl)
Co-supervisors:Kamil Wyrąbkiewicz (kamillo[at]umk.pl)
Time: 15.06 – 12.07

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Development of half-bridge power module based on Gallium Nitride (GaN) power semiconductor devices dedicated for conversion of electric energy


The proposed project is focused on development of a half- bridge module equipped in GaN GIT power devices. The designed circuits will be employed in DC/DC and DC/AC power converters in order to realize research projects in the area of modern and high-efficient power electronics.

The research tasks are as follows:
  1. Development of isolated gate driver circuit for a GaN gate injection transistor (GIT) including EMC input filters. The Student should design the electrical circuit of the driver equipped in dedicated isolated integrated circuits (ICs) and power sources with EMC filters. The primary side of the device should be able to operate with a microcontroller board and compatible with TTL standard. The secondary side should control the power devices (GaN GIT) ensuring proper generation of gate signals. The operating conditions of the power circuit: up to 600 V and 15 A.
  2. Design of printed circuit board of the half bridge. This task should be realized taking into account minimization of stray inductances of the circuit paths, it is recommended to design a board with at least 4 or more layers.
  3. Assembling of the developed prototype of half- bridge. At this stage, the designed device should be manufactured by the Student – the electrical components have to be soldered at the surface of the printed board circuit. The prepared device has to be tested and its proper operation should be investigated.
Supervisor: Łukasz Niewiara (lukniewiara[at]umk.pl)
Time: 15.06 – 12.07

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PC-based control platform with real-time Linux and EtherCAT


The purpose of this project is to implement a platform for rapid testing various motion control algorithms on a PC. The platform will be implemented in a real-time Linux operating system – Linux RT-Preempt and will communicate with servo drives via EtherCAT fieldbus. Previous work done in this area included implementation of EtherCAT stack with a drive control module and implementation of trajectory generation modules. This required hand coding these modules in C. In order to enable rapid development of motion control algorithms and servo controllers a solution is required that will enable direct import of control structures from Simulink. In order to achieve that goal an open-source software platform EtherLab will be used.

The research tasks are as follows:
  1. Compilation and integration of the EtherLab software in Linux RT-Preempt
  2. Testing of EtherCAT communication with distributed I/O and servo drives
  3. Implementation of motion control algorithms and controllers in Simulink and exporting them to EtherLab in Linux RT-Preempt
  4. Testing of implemented control algorithms with EtherCAT and servo drives
Supervisor: Marcin Paprocki (marcin.paprocki[at]umk.pl)
Time: 01.07 – 29.07

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Adaptive speed controller for PMSM drive - classical approach


The project objective includes a development and implementation on the laboratory stand selected adaptive control approaches for PMSM drive. Student will compare the developed adaptive controller with already implemented ones.

The research tasks are as follows:
  1. Development and simulation tests of gain scheduled or/and sliding mode approaches for PMSM drive
  2. Simulation tests in Matlab/Simulink environment of developed adaptive controllers for PMSM drive
  3. Implementation of developed adaptive controller in laboratory stand equipped in 2.7kW PMSM, a prototype voltage source inverter with SiC power devices and STM32F4 microcontroller
  4. Comparison of developed approaches with already implemented ones in the laboratory stand.
Supervisor: Tomasz Tarczewski (ttarczewski[at]umk.pl)
Co-supervisors:Rafał Szczepański (rafal.szczepanski00[at]gmail.com)
Time: 15.06 – 12.07

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Computer science

Mining of publicly available software repositories in context of replicable research


The researchers following the reproducible research movement tend to publish supporting resources like source code and data alongside the paper. Access to the source code supporting the research allows faster replication and validation of the results. Some new and interesting questions arise about these types of repositories, like structure, development cycle, and influence on future works and existing software. During this project Mining Software Repositories (MSR) techniques will be used to answer some of these questions. MSR concentrates on analysing rich data sources used in software development, like version control repositories, bug tracking tools, mailing lists and other, with the goal to uncover interesting and usable information that can help to improve software development. Good programming skills are required, but prior experience in MSR is not a must. We will provide tutorials on relevant topics at the beginning of the project.
The research tasks are as follows:
  1. Identify source code repositories that hold supporting materials for research papers, on popular public access platforms, like github, bitbucket, but also publishers own solutions.
  2. Identify type and field of the research.
  3. Identify impact on other research projects.
Supervisor: Piotr Przymus (eror[at]mat.umk.pl)
Time: 29.06 – 26.07 or 06.07 – 02.08

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Impact of scientific research contributions on software development


Scientific research has a large impact on software development. Some new methods and algorithms find their way into mainstream software projects. This poses new and interesting questions about the nature and dynamics behind scientific research and software development. During this project Mining Software Repositories (MSR) techniques will be used to answer some of them. MSR concentrates on analysing rich data sources used in software development, like version control repositories, bug tracking tools, mailing lists and other, with the goal to uncover interesting and usable information that can help to improve software development. One example of such scientific research and software development interaction can be the usage of the EWAH algorithm that found its place in Git software. Good programming skills are required (preferably in Python), but prior experience in MSR is not a must. We will provide tutorials on relevant topics at the beginning of the project.

The research tasks are as follows:
  1. Identify source code repositories that take advantage of scientific research.
  2. Identify type and field of the contribution.
  3. Explore dynamics of this interaction.
Supervisor: Piotr Przymus (eror[at]mat.umk.pl)
Co-supervisors:Jakub Narębski (jnareb[at]mat.umk.pl)
Time: 29.06 – 26.07 or 06.07 – 02.08

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Synthesis of unbounded Petri nets


The project objective includes synthesis of concurrent systems in the form of unbounded Petri nets on the case of given specification (rational and semilinear seta, formal languages, infinite transition systems). The research tasks are as follows:
  1. study on examples of known methods for the synthesis of unbounded Petri nets, basing on eight chapter of Badouel, Bernardinello, Darondeau: Petri Net Synthesis, Springer 2015 and bibliography of this chapter)
  2. extending the list of potential base models and the development of new synthesis methods together with the designation of sufficient and necessary conditions
  3. participation in Advanced Course on Petri Nets (6-12.09)

Supervisor: Łukasz Mikulski (mikulskilukasz[at]gmail.com)
Time: 17.08 – 13.09

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Physics

Cold atoms optical frequency standards for science


Cold atomic experiments are composed of complex setups which require team work and broad knowledge for operation. During the four weeks internship student will be involved in current research activities connected with optical atomic clocks in CASTLE group (http://fizyka.umk.pl/~castle/). The main goal of the internship is to get experience in research team work. Optical atomic clocks with neutral cold atoms allows for absolute precision on the order of 10-18, unmatched by any other device. They cover design of an active optical clock, construction of an ultra-stable laser for strontium atomic clock, and improvements of existing cold atom setups. Other activities are related to search of dark matter with atomic clocks and studies of fundamental physics with atom-light interaction.
The specific tasks including laser stabilization and optics, ultrastable cavities, vacuum setups, optical frequency combs, electronics and simulations can be adopted to student's interests and skills.

Supervisor: Sławomir Bilicki (slawko[at]fizyka.umk.pl)
Co-supervisors:Marcin Witkowski (marcin_w[at]fizyka.umk.pl)
Time: 01.06 – 31.07 (to be agreed)

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Spectroscopy with high-finesse cavities


The use of a high-finesse optical cavity extends the optical pathlength to several kilometers (the cavity is about 1 meter long) and allows precise measurements of weak absorption spectra. CRDS (cavity ring-down spectroscopy), CMWS (cavity mode width spectroscopy) and CMDS (cavity mode dispersion spectroscopy) are the spectroscopic techniques developed in our group allowing for precise measurements of the weak absorption spectra. The molecules spectra investigated in our laboratory are important for atmospheric studies, these include O2, CO, CO2. The TAPS student will get the opportunity to learn these experimental techniques working with the state-of-the-art spectrometer. Furthermore, student will be introduced to advanced spectral line shape models and multispectrum fitting technique.
Depending on the student’s interest and experience he/she may be involved in participation in ongoing measurements, data analysis, development and construction of a new spectrometer, development of the experimental control software.

Supervisor: Jolanta Domysławska (jolka[at]fizyka.umk.pl)
Time: 29.06 - 24.07

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Plasmon Enhanced Fluorescence of PSI based electrode


Metal-enhanced fluorescence (MEF) occurs in hybrid structures due to the presence of localized plasmon resonance in metallic nanoparticles. In this project we apply Photosystem I (PSI) and Silver Island Film (SIF) to construct a hybrid nanostructure. Oriented layer of PSI on SIF will be obtain using the electrodeposition. The main aim of this experiment is to describe the energy transfer in the such hybrid nanostructures and the influence of various parameters on the efficiency of this process.
The experiment will be focused on imaging the fluorescence from PSI in presence of SIF and using wide field fluorescence microscopy in the visible spectral range. The student will be involved in some steps of the hybrid structure fabrication including synthesis of the SIF layer.

Supervisor: Dorota Kowalska (dorota[at]fizyka.umk.pl)
Time: 01.07 – 28.07

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“Thin” and “thick” silver nanowires as a source of luminescence enhancement


The main objective of this project is to investigate optical properties of thin (diameter < 100 nm) and thick (diameter > 300 nm) silver nanowires, especially their ability to localize electromagnetic fields and thus tune spectroscopic properties of nearby nanoemitters. We will show that probability of radiative emission of single emitter depends on polarization of the excitation laser with respect to the emitter-coupled nanowire. This process also depends on thickness of the nanowire.

Main research goals:
  1. introduction to fluorescence microscopy
  2. characterization of silver nanowires (SEM, AFM)
  3. confocal microscopy of single emitter
  4. polarization- and time-resolved microscopy of metal-enhanced single emitters
Supervisor: Dawid Piątkowski (dapi[at]fizyka.umk.pl)
Time: 01.08 – 31.08

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Investigations of hybrid photovoltaic cells based on perovskites and organic compounds


The project includes the following research problems:
Supervisor: Przemysław Płóciennik (przemas.plociennik[at]gmail.com)
Time: 01.06 – 30.06

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Methods of multilinear algebra in multipartite quantum entanglement detection and data analysis


Multilinear algebra deals with multi (more than 2) indices tensors, which entries can be arranged into multidimensional matrices. The student will get familiar with multidimensional generalisations of such notions as rank, deter- minant and singular value decomposition, which are more involved that their origin formulations for two-dimensional matrices. During the programme the student will learn the application of multidimensional matrices in problems of multipartite entanglement and data analysis.
During the stay the student will be introduced into problems of multilinear algebra, algebraic geometry, theory of entanglement and data analysis. The goal will be to solve a simple problem, like charactering a class of mul- tidimensional matrices of a given properties, classify types of entanglement within a given family of three-qubit states or something of similar level of difficulty.

Supervisor: Gniewomir Sarbicki (gniewko[at]fizyka.umk.pl)
Co-supervisors:Katarzyna Siudzińska (kasias[at]fizyka.umk.pl)
Time: 29.06 – 26.07

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Geometry of the Pauli channels


The goal of this project is to analyze the geometrical properties of a sub- set of quantum channels - Pauli channels. The Choi-Jamiołkowski isomor- phism between quantum states and quantum channels allows for equipping the manifold of states corresponding to the trace-preserving Pauli maps in the Hilbert-Schmidt metric. The associated volume element can be integra- ted analytically over the integration regions given in terms of the map’s eigenvalues. Relative volumes can be interpreted as the probability that a randomly generated Pauli map has the desired properties, like being comple- tely positive, entanglement breaking, divisible, or achievable with a legitimate time-local generator.
Research tasks include the derivation of the total volumes for important subclasses of the positive, trace-preserving Pauli maps. The calculations will be carried out for invertible maps with a full Kraus, non-invertible maps, and also dynamical maps, which provide the evolution for open quantum systems. The Pauli channels describe the mixed unitary evolution of a qu- bit. They found many applications in quantum information theory, quantum information processing, quantum communication, and many more.

Supervisor: Gniewomir Sarbicki (gniewko[at]fizyka.umk.pl)
Co-supervisors:Katarzyna Siudzińska (kasias[at]fizyka.umk.pl)
Time: 03.08 –30.08

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Description of noncovalent interaction within ab initio DFT methods


The accurate description of noncovalent interactions (NCI) plays an important role in many areas of science e.g. biology, chemistry, and physics. Usually, the interaction energies for these species are calculated using coupled-cluster singles and doubles with perturbative triples method [CCSD(T)]. Although the accuracy of the CCSD(T) results is high (considered as a reference in many cases) the computational cost of the method (scaling as N7, where N – is the number of electrons) becomes a real bottleneck in many applications, especially for large molecular systems. In Chem. Phys. Lett. 405, 43 (2005) is was shown that ab initio DFT methods are able to provide a relatively good description of NCI at a much lower computational cost.
This general conclusion was based only on a few simple exemplary cases. Thus, within this project, we would like to make some broader assessment of ab initio DFT methods such as OEP2-sc and OEP2-SOS on the standard benchmarks set available in the literature. We will also investigate also several theoretical aspects related to ab inito DFT method e.g. the role of single excited term or different scaling schemes in OEP2-SOS method.
Potential candidates should have good mathematical skills, basic knowledge of quantum chemistry and be familiar with the Linux operating system.

Supervisor: Szymon Śmiga (szsmiga[at]fizyka.umk.pl)
Time: 01.07 – 31.07

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Flexible auxiliary basis sets in the optimized effective potential method


The ab initio density functional theory (DFT) provides one of the most effective tools to develop exact exchange-correlation (XC) potentials and functionals within the Kohn-Sham (KS) DFT (KS-DFT) framework. However, one of the most problematic features of ab initio DFT is the solution of integral Fredhold equation of I kind which produces the local exchange-correlation potential for a given orbital-dependent functional within, so-called, optimized effective potential method (OEP). Unfortunately, numerical solution is only possible for small systems which exhibit spherical symmetry. In general applications one need to solve OEP Fredholm using the projection method, where both potential and density-density response matrix are spanned in M-dimensional auxiliary basis set. This turns the solution of OEP equation into the algebraic problem which may be solved, on the first glance, much easier. Sadly, this transformation rises much more question than it answers. For example, how to choose the auxiliary basis set to be sure that it spans the response matrix and XC potential properly. Improper selection of auxiliary basis set leads to the unphysical oscillatory behavior of XC potential in the inner-valence and core regions which might cause a problem with convergence of OEP equation. During the summer project we would like to lean over this problem, basically to find a mathematical procedure to obtain smooth XC potential by removing or reducing the unwanted oscillations. We will try to solve this problem by utilization of some basic mathematical concepts related to solution of inverse problem.
Potential candidates should have good mathematical skills, basic knowledge of quantum chemistry and be familiar with the Linux operating system.

Supervisor: Szymon Śmiga (szsmiga[at]fizyka.umk.pl)
Time: 01.07 – 31.07

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Modelling of molecular spectra with advanced line profiles


Modelling of molecular spectra requires knowledge of not only the thermodynamic conditions of the gas but also the line-shape parameters. Retrieval of these parameters requires the use of realistic line profiles which account for several physical effects affecting the line shape. Apart from the simplest ones, i.e. the Doppler broadening and the collisional broadening and shifting, other effects such as the speed-dependence of collisional broadening and shifting, the velocity-changing collisions, and the correlations between velocity- and phase-changing collisions may need to be taken into account. The student will be responsible for the development of the software for molecular spectra simulation based on advanced theoretical models (e.g. the Hartmann-Tran profile). He/she will also work on the retrieval of the line-shape parameters from the high-quality experimental data measured using the cavity ring-down spectroscopy.

Research tasks are as follows:
  1. Simulation of the line-shape profiles based on advanced theoretical models (e.g. the Hartmann-Tran profile)
  2. Development of spectra fitting software
  3. Analysis of experimental spectra of atmospheric gases (e.g. O2, CO) measured in various pressure ranges
Supervisor: Szymon Wójtewicz (szymon[at]umk.pl)
Time: 29.06 – 26.07

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Fabrication and characterization of OLEDs based on 8-hydroxyquinoline complexes with metals


This work will contain investigation of the structural and optical properties of the thin films containing 8-hydroxyquinoline complexes with various metals (aluminum, zinc, copper, etc.) The films will be fabricated by physical vapor deposition (PVD) technique by using Kurt J Lesker Nano-36 Thermal Evaporator in high vacuum. The films will grow on glass and transparent soft (PET coated by ITO) substrates kept at room temperature during the deposition process. Spectral properties of these films will be examined using transmittance spectroscopy as well as normal fluorimetry and time and thermal dependent luminescence measurements. AFM will be used to study structural properties of the films.
Selected thin films with high luminescence efficiency will be used to produce organic luminescent diodes. The current-voltage (I-V) characteristics of the received OLEDs will be measured. Finally, spectra of emitted light and efficiency of the diodes as a function of the complex metal core will also be examined.

The research tasks are as follows:
  1. Application of PVD techniques for deposition process of the thin films containing 8-hydroxyquinoline complexes with various metals.
  2. Characterization of optical and structural properties of thin film as a function of the complex metal core.
  3. Investigation of the fabricated OLEDs as a function of the complex metal core.
Supervisor: Anna Zawadzka (azawa[at]fizyka.umk.pl)
Time: 01.06 – 30.06

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