48TH NATIONAL CONFERENCE OF CHEMISTRY TEACHERS

DIGITALIZATION OF EDUCATION: NECESSITY AND PROBLEMS

LASER MICRO-PERFORATION AND FIELDS OF APPLICATION

Replacing of conventional technology for producing microfilters with a laser technology is presented in the paper. Two approaches for laser drilling through melting and sublimation are discussed. The paper describes possibilities of laser technology in obtain...

ELABORATION OF A LAB EXERCISE TO ANALYZE THE CHARACTERISTICS OF PHOTOVOLTAIC PANELS THROUGH A V-I ELECTRONIC UNIT

A lab exercise has been developed to teach students how to monitor and analyze basic characteristics of a photovoltaic (PV) panel. The exercise configuration is based on an electronic unit, previously constructed and reported by the authors. It is applied t...

CHITOSAN/ALGINATE COMPLEXES PREPARED BY JET MIXING

The influence of mixing procedure on the size of polyelectrolyte complexes (PECs) was investigated using modified jet mixing complexation technique. Two natural weak polyelectrolytes – chitosan and alginate were used for PECs formation. All the experiments we...

APPLIED PHOTONICS AND ANTIOXIDANT PROPERTIES OF HIGH OLEIC SUNFLOWER OIL WITH HERBS

Physico-chemical and optical properties of sunflower oil with basilicum (Ocimum basilicum), rosemary (Rosmarinus officinalis) and walnut oil have been investigated. Adding herbs to the sunflower oil increases the content of polyunsaturated fatty acids β-β-c...

THE DIFFUSION AS A BASE OF DIALYSIS

The aim of this paper is to present the nature of the processes osmosis and diffusion, their crucial part in the excretory system of the living organism as well as the physical principles behind dialysis. There are two methods of dialysis hemodialysis and per...

IN VITRO EVALUATION OF THE ANTIOXIDANT PROPERTIES OF OLIVE LEAF EXTRACTS – CAPSULES VERSUS POWDER

The olive leaf extract has been known for its healing abilities since ancient times, when it was used to brew tea and to treat multiple conditions. In modern times it is advertised as a natural source of antioxidants which have a positive effect on human hea...

MODEL FOR CONTENTIVE AND TECHNOLOGICAL INTEGRATION APPLIED IN ENVIRONMENTAL EDUCATION

The problem concerning unity of scientific knowledge and hence its transformation into educational knowledge is not new to research. In recent years, the idea of implementing this unity has been present in the normative documentation for the management of pr...

REMARKS ON THE NORMATIVE PROVISION OF THE PROCESS OF LEARNING IN SCHOOL

The present article presents regulatory requirements for school assessment of students regulated by Regulation No. 11 of 01.09.2016. The forms, types, manner and classifications of assessment are discussed in the article. The general provisions, principle...

ANALYSIS OF THE RESULTS OF THE EXTERNAL ASSESSMENT OF ‘GEOGRAPHY AND ECONOMY’, 5TH GRADE – YEARS 2017 AND 2018

The article presents and analyzes the achievements of the pupils from the 2017 and 2018 external evaluations of geography and economy in Vth grade. Some tricky educational requirements in the new subject curriculum are highlighted. The expert opinions, expre...

PARACELSUS IN THE HISTORY OF CHEMISTRY, MEDICINE AND PHARMACY

Philippus Aureolus Teophrastus Bombastus von Hohenheimm, known also as Paracelsus, is one of the most eminent representative of European alchemy. His achievements and fragments of the course of life are both presented in this article.

2019 − THE INTERNATIONAL YEAR OF THE PERIODIC TABLE OF CHEMICAL ELEMENTS

The 150th anniversary of the discovery of Periodic Table of chemical elements by Dmitri Mendeleev in 1869 will be celebrated in 2019 year. The key role of Mendeleev’s work on elements systematization is presented in brief together with the indispensable effor...

TECHNOLOGY

In modern life, technology is everywhere. But what is it? In this book Erik Schatzberg explains why technology is so difficult to define by examining its threethousand-year history, one shaped by persistent tensions between scholars and technical practitio...