Measurements of spectral reflectance from potato plants were carried out in the years 2000 and 2001 using the field radiometer CE 313 of Cimel Electronique Company. Field experiments permitted to perceive differences in the reflectance of electromagnetic radiation from potato plant cultivars Bekas and Mila as well as differences between the plants treated with fungicides providing the protection against Phytophthora infestans and the untreated plants. A differentiation of the values of vegetative indices between potato cultivars resulted from the unequal development rate of the cultivars and from their different susceptibility to Phytophthora infestans. The assessment of potato plants infection by the studied pathogen using spectral measurements agreed with the results of field inspection.

The field experiment carried out in Winna Góra compared the efficacy of fungicide programs applied in accordance with the NegFry and Routine systems. The results of2002 validation achieved in Winna Góra showed that NegFry model forecasting the late blight occurrence is useful in Polish climatic conditions. Compared with routine treatment schemes, NegFry recommended fewer treatments without significant reduction of yield thus potato protection according to NegFry was more cost-effective than according to Routine system. Basing on these facts the NegFry decision support system can be recommended for Polish climatic conditions.

The objective of the study was to determine the effect of leaf wetness period and air temperature on development of disease symptoms caused by Puccinia recondita on winter wheat. The experiments were carried out in growth chamber at the Institute of Plant Protection in Poznań. Seedlings of a susceptible winter wheat cultivar Mikon, were artificially inoculated with urediniospores of P. recondita and incubated in temperature of 15 and 20°C. The period of duration of leaf wetness varied from 2 to 14 hours. Disease symptoms on seedlings at 20°C appeared 7 days after inoculation. Reduction of temperature to 15°C resulted in the elongation of latency period to 8 days. The relationship between leaf wetness period and disease symptoms severity was also observed. The gratest number of urediniospores in both tested temperatures were observed on plants exposed to 14 hours of leaf wetness. In temperature of 20°C 4 hours of wetness duration was enough to guarantee infection and the appearance of P. recondita pustules, whereas in 15°C at least 10 hours of wet period was needed to cause disease symptoms development. The experimental results were used to produce two equations describing relation between leaf wetness and symptoms development in tested temperatures.

Formalization of a set of beliefs expressed in one language consists in translating them into sentences of another language. The characteristic property of a good formalization is that the target language is correctly chosen and the translations precisely reflect the meaning of the original sentences. In the paper a formalization of ontology of situations (given by Professor Bogusław Wolniewicz) is discussed. I argue that this is an example of a perfect solution of the problem.

Można wskazać dwa podstawowe kryteria racjonalności wnioskowania: koherencyjne i korespondencyjne. Stosując pierwsze z nich, uznamy wnioskowanie za racjonalne, kiedy będzie ono przebiegać zgodnie z pewnymi ustalonymi normami (np. logiką, prawami rachunku prawdopodobieństwa), stosując drugie – oczekujemy od wnioskowania, aby jego wniosek był prawdziwy (lub przynajmniej bliski prawdzie). W artykule została omówiona wzajemna relacja między tymi różnymi kryteriami racjonalności oraz ich związek z typem środowiska, którego wnioskowanie dotyczy.

Najbardziej znaną częścią zakładu Pascala jest argumentacja kończąca się tezą o opłacalności postawienia na istnienie Boga. Autor Myśli przedstawił także sposób pełnej realizacji zakładu: po zaakceptowaniu racjonalności zakładu konieczne jest podjęcie regularnych praktyk religijnych. Dopiero wówczas osoba może zdobyć wiarę i z nadzieją oczekiwać zbawienia. Artykuł przedstawia propozycję Pascala oraz różne jej interpretacje. Przedyskutowane zostały także najważniejsze zarzuty wiążące się z drugą częścią zakładu.

Under the pressure of sanitary restrictions, the potential of information technologies available to the academic communities for over a dozen years, but not used for various reasons, is released. As a specific case of this trend, a migration from brick-and-mortar voting towards the remote voting by electronic means may intensify in the post-pandemic period at universities. This phenomenon requires an in-depth analysis, the aim of which is to facilitate the management of academic units to choose optimal solutions in the coming years, when such decisions can be made without time pressure and invasive sanitary restrictions. In the process of electronic remote voting, security is a key requirement, which has a number of various attributes: authenticity, correctness, anonymity, verifiability, receiptfreeness, availability. In response to these, to some extent contradictory, requirements, the world of science has been developing protocols and systems based on cryptographic formalisms for years. This article explains the main challenges related to security of remote electronic voting, from which even advanced solutions implemented in academic practice are not free.

The author outlines a basic framework for anarcho-capitalism, a stateless social order in which safety, law and adjudication of disputes are provided by private companies (private defense agencies) competing with each other in the free market. In the course of presentation, three fundamental problems of anarcho-capitalism are addressed. (1) Is a peaceful cooperation among agencies possible? (2) Would agencies respect the rights of their customers? (3) How would the law look like in an anarcho-capitalist society? The last problem is especially vexing, since anarcho-capitalists seem to be caught up in a contradiction here. On one hand they are proponents of a specific moral theory (based on non-aggression principle), on the other hand they do not allow for any central, monopolistic agency to impose that moral theory on society. Is it possible for the law in the anarcho-capitalist society to be simultaneously produced by competing agents and remain libertarian at the same time?

Scribes of the oldest part of the manuscript posted their names in two notes. In the fi rst note the final letter of the scribe’s name is seriously damaged. It is generally believed that his name was Mičьka (Мичька). The author proves that the scribe’s name is a derivative from the suffi x –ko (Mičьko). In the second note the name of the scribe is heavily damaged in the initial part, which results in a number of interpretations. According to the author’s studies the name of the scribe was Potamij (Потамий, gr. PÒtamoj).