Publications by authors named "A V Druzhinina"
Article Synopsis
- - The article investigates the distribution of 137Cs (cesium-137) in the bottom sediments of various Arctic rivers in the Barents Sea basin, specifically in the Nenets Autonomous Okrug, due to concerns over existing and historical radiation sources in the region.
- - Between 2020 and 2023, researchers collected 199 sediment samples from rivers like Chizha and Pechora to analyze the specific activity of 137Cs, sediment composition, and other related factors, finding values up to 36.0 ± 3.2 Bq·kg in the Nes River area.
- - The study suggests a zone of increased 137Cs in the Nes River basin, likely influenced by runoff, hydrology
Enthalpy of formation of 6-phenyl-1,5-diazabicyclo[3.1.0]hexane by combustion calorimetry and theoretical approach for efficient prediction of thermochemistry of diaziridines.
Phys Chem Chem Phys
September 2023
Article Synopsis
- - The study focused on determining the combustion energy and standard molar enthalpy of formation for a new compound called crystalline 6-phenyl-1,5-diazabicyclo[3.1.0]hexane (PDABH) using an advanced calorimetry technique.
- - PDABH is the first diaziridine compound for which these experimental enthalpy values have been obtained, and they were validated with theoretical calculations to ensure accuracy.
- - The researchers used a specific high-level quantum chemistry method (DLPNO-CCSD(T)/CBS) to calculate gas phase enthalpies and the molecular electrostatic potential (MEP) to estimate the enthalpy of sublimation,
The article is devoted to the study of trace metals content in the Pechora River and its tributaries, which is the largest river in the Arctic Ocean basin. The study of physico-chemical properties of water showed aerobic conditions of low-mineralised water with pH values suitable for drinking water. Analysis of the content of trace metals has revealed that the main flow of Al, Mn, Co, Cu, Zn, V, As, Mg and Fe into the Pechora River comes from its tributaries.
View Article and Find Full Text PDFThe heat capacity and phase transitions of 2-methyltetrahydrofuran in the temperature range from 7 to 350 K were measured using adiabatic calorimetry. The smoothed molar thermodynamic functions in the condensed state were determined on the basis of these measurements. The thermodynamic functions of the formation were also calculated.
View Article and Find Full Text PDFEnthalpy formation of fluorene: a challenging problem for theory or experiment?
Phys Chem Chem Phys
September 2021
The large discrepancy between the experimental enthalpy of formation of fluorene and theoretical value calculated by the G3(MP2) method was revealed more than ten years ago. Three years later, a new experimental study of this compound was undertaken to ascertain whether there is any significant error in the thermochemical data. However, after this research, the agreement between theory and experiment was improved only slightly.
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