0000000000267990
AUTHOR
Solvita Kostjukova
INFORMATICS SUBJECTS’ CONNECTION WITH TEACHABLE SPECIALTY IN LATVIA AND WORLD
The question is solved in the article what to evaluate connection with specialty of the subjects of informatics. The course descriptions are given in the internet. The authors offer variant what evaluate course descriptions by 3 score system. The lecturers’ produced materials show more demonstrative connection with specialty. The authors show what we need regard evaluating and offer evaluation methodic by 5 score system. The criterions are offered what to evaluate if methodic works right. The viewpoint based with research between students.
Microbiological Stability of Bio-Based Building Materials
The aim of this paper was to study the microbiological stability of bio-based composite building materials, which are made using organic-rich lake sediments (further – sapropel) with lime and magnesium cement as binders and hemp shives as filler. The microbial stability properties of the obtained composite materials were investigated and compared to similar composites. Because of their high organic content, these materials are prone to biodegradation; therefore, they were coated with ALINA LIFE TM organoclay coating, which helps to extend the product life, reducing the rate of biodegradation compared to the biocides used in industry. The effect of the coating on the resistance to decay by t…
Determination and Toxicology Studies of Quaternary Ammonium Salts in Solution after Organoclay Processing
Organoclays have potential to be used as additives in various facade paints and other finishing materials. Such new innovative materials must be rigorously tested for them to have no impact on environment. Focus of this study was to develop HPLC – TOF/MS method for determining quaternary ammonium salts in various material washing solutions and to determine organoclay toxicity by performing acute toxicity test on Daphnia magna. From the obtained results, it was possible to conclude that organoclays can be safely used as additives in various materials with low or no impact on environment. We determined that organoclays are significantly less toxic then some quaternary ammonium salts on its ow…