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Abstract

A two-parameter continuation method was developed and shown in the form of an example, allowing determination of Hopf bifurcation sets in a chemical reactor model. Exemplary calculations were made for the continuous stirred tank reactor model (CSTR). The set of HB points limiting the range of oscillation in the reactor was determined. The results were confirmed on the bifurcation diagram of steady states and on time charts. The method is universal and can be used for various models of chemical reactors.

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Authors and Affiliations

Marek Berezowski
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Abstract

The article presents the results of the questionnaire research carried out after the first and repeated after the second semester of crisis remote education, conducted at The Maria Grzegorzewska University. Students participating in the study indicate a significant increase in their IT competences and the level of remote education. They declare a similar, high level of commitment and independence during classes. They indicate that commitment, activity, contact with the lecturers, regularity and quality of work, as well as the adequacy of the grades given are better during traditional education, although their timeliness is higher during distance education. The computer equipment of students and the way of accessing the Internet have not changed significantly. 20% of respondents admitted to using unauthorized assistance during exams. In the statements of students, on the one hand, there is a desire to return to social contacts and traditional classes, and on the other hand, a desire to maintain remote education, associated with the comfort of home-based learning and independence.
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Bibliography

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Authors and Affiliations

Miłosz Wawrzyniec Romaniuk
1
Joanna Łukasiewicz-Wieleba
1

  1. The Maria Grzegorzewska University, Warsaw, Poland
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Abstract

The aim of this study was to determine if reticulorumen ph, temperature and cow activity registered before calving can serve as indicators of diseases after calving.

The cows were selected according to those fitting the profile of having had two or more lactations (on average 2.9±0.13 lactations), from 60 to 0 days before and the first 30 days after calving, and being clinically healthy. The clinical examination (identification of diseases after calving) was performed from 60 days before calving to 60 days after calving. Diseases after calving were diagnosed based on clinical symptoms specific to these diseases. The pH and temperature of the contents of the cow reticulorumens and cow activity were measured using specific smaX-tec boluses manufactured for animal care.

We found that the highest pH and temperature before calving can serve as biomarkers of healthy cows after calving. The lowest reticulum temperature before calving can serve as an indicator of MF after calving. A positive correlation of reticulum pH and temperature before calving can serve as biomarkers of PR. Decreasing cow activity before calving can serve as an indicator of diseases after calving. For calving prognosis, temperature of the reticulorumen can be used; it decreased 6–7 days before calving.

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Authors and Affiliations

R. Antanaitis
V. Juozaitienė
D. Malašauskienė
M. Televičius

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