Professor Zdzisław Hellwig (1925–2013) a Giant in the Renaissance Style

On 8th November 2013, with great sadness we said goodbye to our dear Master and Teacher, Professor Zdzisław Hellwig. He walked away from us forever. Professor Zdzisław Hellwig (1925 – 2013) was a great man with impressive biography. Primarily professor Zdzisław Hellwig was prominent, widely recognized, eminent scholar of international standing in the field of statistics. His most important works are Elements of probability and mathematical statistics, Linear Regression and its applications in economics and Stochastic approximation. On 8th November 2013, with great sadness we said goodbye to our dear Master and Teacher, Professor Zdzisław Hellwig. He walked away from us forever. Professor Zdzisław Hellwig (1925 – 2013) was a great man with impressive biography. Primarily professor Zdzisław Hellwig was prominent, widely recognized, eminent scholar of international standing in the field of statistics. His most important works are Elements of probability and mathematical statistics, Linear Regression and its applications in economics and Stochastic approximation. His second field of achievements was econometrics. The rich scientific achievements in the field of econometrics of Professor Zdzisław Hellwig cover numerous studies dealing with the theory and application, including modeling of the socio – economic development, economic forecasting, and multidimensional comparative analysis and taxsonometrics. Professor Zdzisław Hellwig has a standing as economist. Professor Zdzisław Hellwig is a precursor of research in the field referred to as sustainable development, and early warning system for the national economy. He is considered pioneer of computer science in Poland. His international activities gave him the global scholar rank. Professor Zdzisław Hellwig was exceptionally gifted teacher and educator with long list of prominent followers. He has notable achievements as an organizer. Achievements of Professor Zdzisław Hellwig were widely acknowledged, both in the home university, countywide and abroad.

Nature value of the environment in Poland and its protection

Published in: Natural environment of Poland and its protection in Łódź University Geographical Research, edited by E. Kobojek and T.Marsza

Design of engineering systems in Polish mines in the third quarter of the 20th century

Participation of mathematicians in the implementation of economic projects in Poland, in which mathematics-based methods played an important role, happened sporadically in the past. Usually methods known from publications and verified were adapted to solving related problems. The subject of this paper is the cooperation between mathematicians and engineers in Wroc{\l}aw in the second half of the twentieth century established in the form of an analysis of the effectiveness of engineering systems used in mining. The results of this cooperation showed that at the design stage of technical systems it is necessary to take into account factors that could not have been rationally controlled before. The need to explain various aspects of future exploitation was a strong motivation for the development of mathematical modeling methods. These methods also opened research topics in the theory of stochastic processes and graph theory. The social aspects of this cooperation are also interesting.Comment: 45 pages, 11 figures, 116 reference

Low-Temperature Pyrolysis of Municipal Solid Waste Components and Refuse-Derived Fuel—Process Efficiency and Fuel Properties of Carbonized Solid Fuel

New technologies to valorize refuse-derived fuels (RDFs) will be required in the near future due to emerging trends of (1) the cement industry’s demands for high-quality alternative fuels and (2) the decreasing calorific value of the fuels derived from municipal solid waste (MSW) and currently used in cement/incineration plants. Low-temperature pyrolysis can increase the calorific value of processed material, leading to the production of value-added carbonized solid fuel (CSF). This dataset summarizes the key properties of MSW-derived CSF. Pyrolysis experiments were completed using eight types of organic waste and their two RDF mixtures. Organic waste represented common morphological groups of MSW, i.e., cartons, fabrics, kitchen waste, paper, plastic, rubber, PAP/AL/PE composite packaging (multi-material packaging also known as Tetra Pak cartons), and wood. The pyrolysis was conducted at temperatures ranging from 300 to 500 °C (20 °C intervals), with a retention (process) time of 20 to 60 min (20 min intervals). The mass yield, energy densification ratio, and energy yield were determined to characterize the pyrolysis process efficiency. The raw materials and produced CSF were tested with proximate analyses (moisture content, organic matter content, ash content, and combustible part content) and with ultimate analyses (elemental composition C, H, N, S) and high heating value (HHV). Additionally, differential scanning calorimetry (DSC) and thermogravimetric analyses (TGA) of the pyrolysis process were performed. The dataset documents the changes in fuel properties of RDF resulting from low-temperature pyrolysis as a function of the pyrolysis conditions and feedstock type. The greatest HHV improvements were observed for fabrics (up to 65%), PAP/AL/PE composite packaging (up to 56%), and wood (up to 46%)

Analysis of the strategic groups maps of the higher schools sector in Poland

This paper presents the theoretical assumptions of the method of strategic groups maps and an analysis of the higher schools sector in Poland. Moreover, it presented as a proposal for a simplified version of the method of strategic groups maps. It has used data on the ranking of the universities sector in Poland, which was conducted in 2011 by Perspektywy, thanks to which universities were classified into different strategic groups. It should be also noted that for the purposes of this study the top 50 universities in Poland (higher schools which gained relatively high places in this ranking), were taken into account. Which means that the studies are not fully representative, and therefore are rather pilot researchesW niniejszym opracowaniu zaprezentowano teoretyczne założenia metody analizy map grup strategicznych sektora szkół wyższych w Polsce. Ponadto zaproponowano uproszczą wersję metody map grup strategicznych. W opracowaniu podstawę stanowiły informacje zawarte w rankingu szkół wyższych w Polsce, przeprowadzonego w 2011 roku przez "Perspektywy", dzięki któremu szkoły wyższe zostały sklasyfikowane w równe grupy strategiczne. Należy również wspomnieć, iż dla celów niniejszego opracowania pod uwagę wzięto 50 najlepszych polskich uczelni (szkół wyższych, które zdobyły najwyższe miejsca w tym rankingu). Oznacza to, iż przeprowadzone badania nie są w pełni reprezentatywne, i mają charakter badań pilotażowyc

Perspectives on the Transformation of Breslau into Wrocław, 1945-1948

Breslau, which is now known as Wrocław, is a city in Western Poland that was annexed after the end of the Second World War. The final goal regarding Poland was to create an ethnically homogenous nation state, and this was achieved through forced expulsions, killings, and the mass migration of Poles from what is now Lithuania, Belarus, and Ukraine. This paper will explore both civilian and administrative perspectives of these events in the city of Wrocław while this was taking place in Poland from 1945 to 1948. It will also examine the relationships that developed between the two through the use of statistics, propaganda posters, pictures, firsthand accounts, diaries from the period, newspaper and magazine articles, a novel by Olga Tokarczuk, and three other nonfiction books on the topic.   &nbsp