Metastable Solid Solutions in the Gallium Antimonide-Germanium Pseudobinary System

Abstract unavailable

Metastable Electron Compound in Ag-Ge Alloys

Abstract unavailable

Knowledge in the dark: scientific challenges and ways forward

A key dimension of our current era is Big Data, the rapid rise in produced data and information; a key frustration is that we are nonetheless living in an age of ignorance, as the real knowledge and understanding of people does not seem to be substantially increasing. This development has critical consequences, for example it limits the ability to find and apply effective solutions to pressing environmental and socioeconomic challenges. Here, we propose the concept of “knowledge in the dark”—or short: dark knowledge—and outline how it can help clarify key reasons for this development: (i) production of biased, erroneous, or fabricated data and information; (ii) inaccessibility and (iii) incomprehensibility of data and information; and (iv) loss of previous knowledge. Even in the academic realm, where financial interests are less pronounced than in the private sector, several factors lead to dark knowledge, that is they inhibit a more substantial increase in knowledge and understanding. We highlight four of these factors—loss of academic freedom, research biases, lack of reproducibility, and the Scientific tower of Babel—and offer ways to tackle them, for example establishing an international court of arbitration for research and developing advanced tools for research synthesis

The visitor from an ancient galaxy: A planetary companion around an old, metal-poor red horizontal branch star

We report the detection of a planetary companion around HIP 13044, a metal-poor red horizontal branch star belonging to a stellar halo stream that results from the disruption of an ancient Milky Way satellite galaxy. The detection is based on radial velocity observations with FEROS at the 2.2-m MPG/ESO telescope. The periodic radial velocity variation of P=16.2 days can be distinguished from the periods of the stellar activity indicators. We computed a minimum planetary mass of 1.25 Jupiter masses and an orbital semimajor axis of 0.116 AU for the planet. This discovery is unique in three aspects: First, it is the first planet detection around a star with a metallicity much lower than few percent of the solar value; second, the planet host star resides in a stellar evolutionary stage that is still unexplored in the exoplanet surveys; third, the planetary system HIP 13044 most likely has an extragalactic origin in a disrupted former satellite of the Milky Way.Comment: 5 pages, 2 figures, 2 tables, submitted to the Proceedings of the 276th IAU Symposium "The Astrophysics of Planetary Systems

Web Portal for Network Traffic Reporting

Náplní této bakalářské práce je návrh, analýza a implementace webového portálu pro generování zpráv o síťovém provozu. Dále se tato práce zabývá analýzou možností vytváření grafů, tabulek a statistik z dat, získaných prostřednictvím technologie NetFlow. Právě technologie NetFlow je klíčovým prvkem a celá tato práce je na ní postavena. Cílem této práce je možnost snadného, přehledného a jednoduchého monitorování síťového provozu a následné analýzy získaných dat v podobě vygenerovaných souhrnných zpráv. Pro implementaci byly zvoleny jazyky PHP a HTML. Zprávy o síťovém provozu budou generovány v dnes velmi oblíbeném formátu PDF.The main subject of this bachelor thesis is an proposal, analysis and implementation of the web portal for network traffic reporting. This work also deals with analysis of creating  graphs, tables and statistics from data gained by NetFlow technology. The NetFlow technology itself is the key element in this thesis and this work is based on it. The main goal of this thesis is to make a simple tool for monitoring and analyzing the network traffic by generating complex reports. For the implementation itself, PHP and HTML have been chosen. Reports will be generated as well-know PDF documents.