INNOVATION IN ENVIRONMENTAL ENGINEERING EDUCATION AT REZEKNE HIGHER EDUCATION INSTITUTION

The paper discusses the elaboration of new study program and curricula in Environmental Engineering at the Rezekne University (RU).The main goal of the Program is to prepare new formation of Environmental specialists - Ecotehnblogists, who are able not only to control pollution of Enviroment, but to prevent it on the early stages by applying in industry ecologically safe technologies

Identification of the Content of Biologically Active Substances in Nut Shots

One of ways of the food industry development is a search for non-traditional raw material resources with the high content of physiologically healthy nutrients. A promising way of biologically important raw materials is secondary products of oil production, especially shots. The aim of the research was to determine the content of biologically active substances in nut shots (cedar nut shot (CNS) and walnut shot (WNS)). The quality composition of the phenol nature was established by reactions with 10 % alcohol solutions of FeCl3, NaOH, АlCl3 and cyanidin test. The content of hydroxycinnamic acids (with recalculation for chlorogenic acid) was determined by the spectrophotometric method. The amount of tanning substances – by the method of permanganometry. The analysis of the sum of flavonoids (in recalculation for rutin) was realized by the method of differential spectrophotometry. Carbonic acids were identified by the method of gas-liquid chromatography. There were revealed quality differences in the composition of substances of the phenol nature for CNS and WNS. WNS is characterized by the higher content of hydroxycinnamic acids – in 2,5 times, tanning substances – in 3,1 times and flavonoids – in 60 times, comparing with CNS. The content of unsaturated fats in WNS is 95,79 % of the total number of fats, and in CNS – 80,05 %. The ratio Omega-3/Omega-6 for the fat component of CNS is 1/0,06, and for WNS fats – 1/1,3. WNS comparing with CNS is characterized by the higher content of Malic (in 5,3 times) and fumaric (in 100 times)acid. CNS contains more lemon (in 2,9 times) and succinic (in 2,2 times) acid. That is, identification of the content of some biologically active substances in nut shots allows to recommend them for usage in technologies of food products. It allows to enrich them with phenol compounds, polyunsaturated fats and organic acids

From Temporal to Contemporaneous Iterative Causal Discovery in the Presence of Latent Confounders

We present a constraint-based algorithm for learning causal structures from observational time-series data, in the presence of latent confounders. We assume a discrete-time, stationary structural vector autoregressive process, with both temporal and contemporaneous causal relations. One may ask if temporal and contemporaneous relations should be treated differently. The presented algorithm gradually refines a causal graph by learning long-term temporal relations before short-term ones, where contemporaneous relations are learned last. This ordering of causal relations to be learnt leads to a reduction in the required number of statistical tests. We validate this reduction empirically and demonstrate that it leads to higher accuracy for synthetic data and more plausible causal graphs for real-world data compared to state-of-the-art algorithms.Comment: Proceedings of the 40-th International Conference on Machine Learning (ICML), 202

АНАЛИЗ РЕЗУЛЬТАТОВ КОМПЬЮТЕРНОГО МОДЕЛИРОВАНИЯ N-СОЛИТОННОГО РЕШЕНИЯ УРАВНЕНИЯ КОРТЕВЕГА – ДЕ ФРИЗА

The results of computer simulation N-soliton solutions of the Korteweg – de Vries equation with N = 1, 2, 3, 4 are shown. Using numerical experiment the property of conservation of area under the envelope of soliton solutions of the Korteweg – de Vries equation is found. In addition, the dependence value of the area under the envelope of N-soliton on the value of parameter, included into a corresponding solution of the Korteweg – de Vries equation, is detected.Приводятся результаты компьютерного моделирования N-солитонного решения уравнения Кортевега – де Фриза при N = 1, 2, 3, 4. С помощью численного эксперимента находится свойство сохранения площади под огибающей солитонных решений уравнения Кортевега – де Фриза. Обнаруживается зависимость значения площади под огибающей N-солитона от значения параметра, входящего в соответствующее решение уравнения Кортевега – де Фриза

Single valley Dirac fermions in zero-gap HgTe quantum wells

Dirac fermions have been studied intensively in condensed matter physics in recent years. Many theoretical predictions critically depend on the number of valleys where the Dirac fermions are realized. In this work, we report the discovery of a two dimensional system with a single valley Dirac cone. We study the transport properties of HgTe quantum wells grown at the critical thickness separating between the topologically trivial and the quantum spin Hall phases. At high magnetic fields, the quantized Hall plateaus demonstrate the presence of a single valley Dirac point in this system. In addition, we clearly observe the linear dispersion of the zero mode spin levels. Also the conductivity at the Dirac point and its temperature dependence can be understood from single valley Dirac fermion physics.Comment: version 2: supplementary material adde