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Determining parameters of extrasolar systems from CCD photometry of their transits
This work deals with a determination of some parameters of transiting exoplanets. This group of exoplanets is very interesting because we can observe their transit over their parent star. The parameters of these exoplanets were determined from the decrease of brightness of the parents star. This decrease was measured with a help of CD photometry. The features of measured light curves were processed with using of the PC program which was created in this work to find out some figures which the observe extrasolar system is characterized.
Development of Red-Fluorescent Materials using POSS-Hybrid
Hye Min Choi
In this study, I chose the 2,6-pyridinedicarbonyxylic acid chloride (PDC) as the original ligand to construct the bridge molecule with POSS amine hybrid compound, which afterward bound with Eu3+ to obtain the binary lanthanide organic-inorganic hybrid material Eu-PDC-POSS. The figure below shows efficient fluorescent activity when subjected to different excitation wavelengths, such as 254 nm, 288 nm, 393 nm, and 464 nm. More importantly, all of these excitation wavelengths match well with the prominent excitation wavelengths of different light-emitting devices.
Development of an anthropomorphic robot hand
Joé Hoffmann, Ben Weber, Patrick Lux
This project aimed to develop an animatronic hand, able to accomplish the basic functionalities of the human hand. Furthermore, the robotic hand shall be comparable to the human hand in sense of dimensions and mass properties, all at low production costs. The robotic hand consists of 2 identical fingers and an opposable thumb. The robotic hand provides only 9 DOF (Degrees of Freedom), necessary to accomplish those functionalities, compared to the 23 DOF in the human hand. Furthermore, an actuation concept was developed, whereby only one servomotor per finger and two motors for the thumb are needed. Extension of the fingers is assured by torsion springs installed in every joint. All parts are printed out of PLA plastic material thus being lightweight while providing sufficient rigidity. In order to test the functionality of the robot hand with regard to the objectives, a master-slave system has been implemented, while the hand is actuated with commands coming from a sensor glove and thus mimics the masters hand position. Experiments were showed that the two basic grips of the human hand are fully accomplished by the robot hand and that grasping of lightweight objects is possible. Position deviations and time delays in comparison to the master’s commanded reference trajectories occurred. Position inaccuracies are mainly due to corrupt outputs of the sensor glove and do not occur when the hand is controlled numerically. In this project, functionality of the robotic hand could be successfully proven. This anthropomorphic hand offers sufficient potential for future research.
Dynamic Road Conditioning Network
The project explores the possibility to use hardware devices embedded in non-specialised vehicles in order to determine road condition. An embedded electronic device was constructed. The device records the vehicle’s vibrations and then the data is processed. Specifically developed software analyses the acceleration signal by computing its Crest factor and RMS values and visualises the road condition on a map. The collected data can be used by drivers to choose the safest route and by municipalities to optimise road repairs. Choosing a good route can be essential for safety and transportation of high risk and high value cargo. Optimising road repairs is also important because a repair can cause traffic jams, therefore, a good repair priority list is important. The data can also be used to analyse car accidents and determine the reasons for it's occurence.
Energy harvesting with piezoelectric materials
Edgars is interested in physics, engineering and has a great experience in motor sport and that is why this research project was carried out. The Project “Energy harvesting with piezoelectric materials” deals with development of measuring device (called d33 measuring cell) for measurements of piezo-electric properties as well as new source of electrical energy for racing motor bikes. In this research piezoelectric materials (called NBT) have been studied. NBT can substitute environmentally unfriendly piezoelectric materials with high lead content. This scientific research project shows the research cycle starting from examining of materials up to the practical application of them. New type of measuring device, NBT and piezo-electric converter have prospective possibilities for being applied in practice. The popularization of d33 measuring cell has to facilitate the work of piezoelectric material producers. NBT materials have to substitute piezoelectric materials with high lead content conforming to EU regulations of fabrication. New piezo-electric converter can be used for all braking systems of vehicles.
Estonian High School Students’ Attitude Towards Global Problems and Change of Perception between 1991 and 2012
Global problems are threatening the continuance of humankind. To get information about whether people understand the importance of these problems a survey was conducted. The supplemented version of “A world problem questionnaire”, worked out by Z. Chlewiński in 1991, was used. The students had to evaluate how important the described 39 global problems are for them and estimate the change of importance of the problems within the next 50 years. In 2012, 1,391 high school students were questioned all over Estonia. The results were compared to earlier studies. It appeared that students consider the global problems generally important and believe that these problems will become even worse in the future. The youth of today are worried about the exhaustion of energy resources, the continuous growth of the world population and the issues of social inequality. In addition, it appeared that the results of the survey were affected by gender, place of habitation and language of study. There is a connection between world problems deemed important by high school students and those most reflected by the media.
Extraction of arsenic and its metabolites after ingestion of contaminated mineral water
Extraction of arsenic and its metabolites after ingestion of contaminated mineral water The purpose of research was to find out how fast is the excretion of inorganic arsenic and which are the main metabolites of inorganic arsenic in urine. In first step of the experiment I was consuming contaminated water and collecting samples of urine for later analysis. In time of collecting my urine I had to be careful about my nutrition and I had to write down everything that I ate that was possibly contaminated with organic arsenic. For urine analysis I used the technique of liquid chromatography on HPLC column Hamilton PRP-X100 coupled on-line with hydride generation and atomic fluorescence spectrometry. After processing the data I realized that arsenic excretes relatively quickly and that its influence on organism in such low concentrations is very small. I assume that if concentrations were bigger the effects would be stronger and if body would be chronically exposed to arsenic the consequences could be fatal.
Factors That Affect the Accuracy of 3-Dimensional Acoustic Locating for Sound Emitting Objects.
Factors That Affect the Accuracy of 3-Dimensional Acoustic Locating for Sound Emitting Objects Maria Zakharova, International School of Stavanger This study in acoustics/physics deals with such phenomena as “sound” and “waves”. An audible sound source (punctured balloon) is being located using experimental time-of arrival measurements on four microphones pre installed in a room. A localization algorithm has been implemented using a GPS-inspired method. Some hypotheses have been formulated regarding factors that may affect the locating accuracy (such as reduced accuracy with range, dependency of microphone layout geometry, and effect of sampling frequency), and tested experimentally. Particular attention is given to theoretical explanation of the experimentally observed effects and dependencies. The main theory for explaining observed errors is the Positional Dilution of Precision theory which is used in GPS. The challenge of explaining some observed anomalies is solved through analysis of the discrete nature of data acquisition. The results of this investigation may be of interest for those who design 3D acoustic locating systems.
FreeGeo – the world's first dynamic Android mathematics system app
Smartphones and tablet computers enjoy immense popularity. They are not only practical due to portability, but their touch-sensitive screens also make them convenient and intuitive to operate. Lennart Kleinwort has taken advantage of these features for his project: He has written a software program that makes it possible to draw and modify geometric figures on smartphones and tablets. The program enables the user to move, rotate or enlarge circles simply by swiping multiple fingers across the screen simultaneously. In addition, users can draw geometric objects on the screen in free-hand mode, which the computer then adds to an existing figure automatically.
Genetics at home: Building a PCR machine and other equipment for setting up a home genetics lab
The aim of this project was to build the equipment required to carry out some basic genetic tests at home for as little cost as possible. I designed and built a fully working PCR machine which copies specific regions of DNA many times as well as several other pieces of lab equipment which can be used to test for SNPs or mutations in genes.