The essence of the “border problem” between Poland and the FRG reaches back to the provisions of the Potsdam Agreement of 1945. The Polish position was unambiguous from the beginning: the border on the Odra and Nysa Łużycka rivers was established under international law in the Potsdam Agreement, while the subsequent actions undertaken within the framework of the “peace settlement” could only have complementary, declaratory significance. On the other hand, in the FRG an official legal position was developed according to which the former eastern German territories were only given to Poland (and the USSR) “under their administration”, and the final decision on the border was left to be taken by the future unified Germany in a “peace treaty” or a “peace settlement”. This position was not changed by the Normalization Treaty between Poland and the FRG of 1970, because it was interpreted in the FRG as only a “treaty about the renunciation of force”, an element of a modus vivendi which was to last until the unification of Germany. On the other hand, the Zgorzelec Treaty of 1950 between Poland and the GDR was interpreted as not binding for the future unified Germany. Such a position deeply destabilized political relations between the FRG and Poland in the post-war period and had a conflict-generating significance in a number of areas. At the beginning of 1990 the political changes in Poland coincided with the process of German unification. The democratic opposition in Poland, and thereafter the government of Tadeusz Mazowiecki, unequivocally supported the right of the German people to self-determination, at the same time expecting an unequivocal position on the Polish-German border. This fundamental problem was closed in 1990 under two international agreements: the Treaty on the Final Settlement with Respect to Germany (2+4 Treaty) and the Treaty between the Federal Republic of Germany (united Germany) and the Republic of Poland on the confirmation of the border between them. Thus for thirty-plus years now the “border problem” has been removed from the agenda of political discussions in Polish-German relations, which proves the effectiveness and durability of the agreement reached, which was reflected in both treaties.

Global brown coal resources are estimated to be extracted at around 512 million Mg. They are found in over a dozen countries, including primarily: Australia, China, the Czech Republic, Greece, Germany, Poland, Russia, the United States and Turkey. More than 80% of total brown coal production in the EU takes place in: Germany, Poland, Greece and the Czech Republic. This means that the majority of production still uses conventional fuels, including both hard coal and brown coal. Given the current energy needs in the context of brown coal reserves depletion and the impacts of the current climate and energy policies of the EU, it is very important that all new investments in mining and energy complexes based on brown coal resources must be prepared carefully to ensure high production efficiency and minimize negative environmental impacts. This article attempts to solve a problem involving the choice of the location of the opening cut to expose brown coal deposits. Due to the stratified nature of brown coal deposits and the associated open-cast mining technology used in a continuous mining system with bucket wheel excavators, belt conveyor systems and spreaders, the location of the opening cut is not completely random and the number of potential solutions is finite. The multifaceted technical, organizational, economic, social and environmental problems require a holistic approach to this research problem. Such an approach should take the different, often opposing, perspectives of the many stakeholders into account. These issues can be solved using mathematical tools designed for multiple-criteria decision support. With the proposed method, a ranking of alternatives can be created, depending on the predefined location of the opening cut.

The paper focuses on the social education of younger students, which I see as an important area of activity that enables a better understanding of oneself, others and the world. However, this can only be achieved if social topics include issues arising from the needs of individuals and social expectations and if expository methods of teaching are replaced by a reflective problem approach. & en “the different one” will cease to be perceived as inferior, dangerous, marked by stereotypes, and will seem interesting, worth knowing, and the world will become a space for the child to explore and discover in order to know it better and act in it more skillfully. The paper is a study report. The starting point for discussion are two conceptual categories of “the inactive bystander effect” and “the active bystander effect” taken from the Heroic Imagination Project by Philip Zimbardo, which I illustrate with the results of ethnomethodological studies conducted among 7–9-year old children during their classes about social issues. The research objective is to reconstruct the features of social knowledge and the process of its acquiring in the classroom. The paper includes a theoretical part that explains the idea and nature of social education with the emphasis on so-called new thematic areas resulting from the needs of individuals and social expectations. Then the paper describes the concept of the studies. The next section presents the research outcomes and highlights several areas of analysis, including lesson topics on social education, methods of their implementation, and the social importance that is revealed during communication practices. The final part contains research conclusions and summarizing reflections.

In the article we study a model of TCP connection with Active Queue Managementin an intermediate IP router. We use the fluid flow approximation technique to model the interactions between the set of TCP flows and AQM algoithms. Computations for fluid flow approximation model are performed in the CUDA environment.

Pigmented villonodular synovitis (PVNS) is a benign disease that rarely undergoes malignant transformation. Th ere are two types of disease: localized (nodular tenosynovitis) and diff used (pigmented villonodular synovitis/tenosynovitis) with intra- or extra-articular locations. Th e second one is limited to synovium of the burse (PVNB) or tendon sheath (PVNTS). Th e intraarticular lesions are usually located in the knee, hip, ankle and elbow joints. Histologically, PVNS is a tenosynovial giant cell tumor, characterized by proliferation of two types of mononuclear cells — predominantly small, histiocyte-like cells and larger cells with dense cytoplasm, reniform or lobulated nucleus, with accompanying multinucleated giant cells and macrophages overloaded with hemosiderin that give typical image on MRI — currently selected as a gold standard for its diagnosis. Th e classic X-ray and CT are non-specifi c but similar to ultrasound should be used to evaluate disease progression and treatment response if radiotherapeutic and pharmacological methods were selected for treatment. An open arthroscopic surgery could also be applied in selected cases.

Psychedelics, as a plant-derived material, have been used for millennia in religious and medical practices. They produce an altered state of consciousness characterized by distortions of perception, hallucinations, dissolution of self boundaries and the experience of unity with the world. Classic psychedelics, also known as serotonergic hallucinogens, such as lysergic acid diethylamide (LSD) and psilocybin were extensively investigated in substance-assisted psychotherapy during the 1950s–1960s. These early clinical studies reported improvement rates in patients with various forms of depression, anxiety disorders, alcohol dependence. The development of modern neuroimaging techniques renewed interest in the investigation of psychedelics as a class of drugs that may reopen multiple therapeutic benefits. Current behavioral and neurochemical data show that psychedelics induce their psychological effects primarily via 5-hydroxytryptamine type 2A (5-HT2A) receptor activation and modulate neural circuits involved in mood and affective disorders. Clinical trials examining psilocybin have suggested that the compound relieves symptoms of depression and anxiety with rapid onset and longer duration. Serotonergic psychedelics enhance expression of neurotrophic factors such as brain-derived neurotrophic factor (BDNF) as well as expression of genes associated with synaptic plasticity and stimulate synapse formation. These effects are similar to those produced by fast-acting antidepressant ketamine. Basic science research can reveal the neural mechanism of psychedelics action and how they can be used for treatment.