scholarly journals Nuclear forensic signatures and structural analysis of uranyl oxalate, its products of thermal decomposition and Fe impurity dopant

2021 ◽  
Author(s):  
Nathan B. A. Thompson ◽  
Martin C. Stennett ◽  
Matthew R. Gilbert ◽  
Neil C. Hyatt
Keyword(s):  
Thermal Decomposition ◽  
Fuel Cycle ◽  
Chemical Properties ◽  
Spent Fuel ◽  
Trace Impurities ◽  
Spent Fuel Reprocessing ◽  
Uranyl Oxalate ◽  
Physical And Chemical ◽  
Nuclear Forensic

AbstractUranyl oxalate (UO2C2O4·xH2O) may exist at the back-end of the nuclear fuel cycle (NFC) as an intermediate in spent fuel reprocessing. The conditions used in aqueous reprocessing and thermal treatment can affect the physical and chemical properties of the material. Furthermore, trace impurities, such as Fe, may incorporate into the structure of these materials. In nuclear forensics, understanding relationships between processing variables aids in determination of provenance and processing history. In this study, the thermal decomposition of UO2C2O4·3H2O and phase analysis of its thermal products are examined. Their morphologies are discussed with respect to a matrix of solution processing conditions.

THE IMPORTANCE OF THE RED BOOK OF SOILS FOR MONITORING AND JUSTIFICATION OF CONSERVATION MEASURES

2020 ◽  
Author(s):  
O.S. Bezuglova ◽  
Keyword(s):  
Chemical Properties ◽  
Natural State ◽  
Soil Maps ◽  
Rostov Region ◽  
Conservation Measures ◽  
Background Data ◽  
The Russian Federation ◽  
Physical And Chemical ◽  
And Chemical Properties

Rostov Region belongs to the highly protected natural territories characterized by the continuous plowing. There territories are the only reserves with the soils preserved in their natural state. However, these areas often lack detailed information about the soils quality and composition. Surveying soils on these territories is crucial for determination of their basic physical and chemical properties. The resulted compilation of soil maps could lay a foundation for creating the Red Book of Soils and the formation of a section in the soil-geographical database of the Russian Federation. Subsequently, such information can be used as a background data for the main types of soils in the region. It will be also valuable during monitoring and justification of conservation measures.

scholarly journals Treated wastewater irrigation effects on soil hydraulic conductivity and aggregate stability of loamy soils in Israel

2015 ◽  
Vol 63 (1) ◽  
pp. 47-54 ◽  
Author(s):  
Karsten Schacht ◽  
Bernd Marschner
Keyword(s):  
Hydraulic Conductivity ◽  
Chemical Properties ◽  
Aggregate Stability ◽  
Treated Wastewater ◽  
Soil Aggregate Stability ◽  
Irrigation Effects ◽  
Physical And Chemical ◽  
The Impact

Abstract The use of treated wastewater (TWW) for agricultural irrigation becomes increasingly important in water stressed regions like the Middle East for substituting fresh water (FW) resources. Due to elevated salt concentrations and organic compounds in TWW this practice has potential adverse effects on soil quality, such as the reduction of hydraulic conductivity (HC) and soil aggregate stability (SAS). To assess the impact of TWW irrigation in comparison to FW irrigation on HC, in-situ infiltration measurements using mini disk infiltrometer were deployed in four different long-term experimental orchard test sites in Israel. Topsoil samples (0-10 cm) were collected for analyzing SAS and determination of selected soil chemical and physical characteristics. The mean HC values decreased at all TWW sites by 42.9% up to 50.8% compared to FW sites. The SAS was 11.3% to 32.4% lower at all TWW sites. Soil electrical conductivity (EC) and exchangeable sodium percentage (ESP) were generally higher at TWW sites. These results indicate the use of TWW for irrigation is a viable, but potentially deleterious option, as it influences soil physical and chemical properties.

In search of an optimum plutonium density measurement fluid

2009 ◽  
Vol 97 (4-5) ◽  
Author(s):  
K. M. Dziewinska ◽  
A. M. Peters ◽  
J. A. La Verne ◽  
P. Martinez ◽  
J. J Dziewinski ◽  
...  
Keyword(s):  
National Laboratory ◽  
Density Measurement ◽  
Chemical Properties ◽  
Decomposition Products ◽  
Los Alamos National Laboratory ◽  
Corrosion Rates ◽  
Physical And Chemical ◽  
Near Future ◽  
Plutonium Metal

AbstractDensity measurements of plutonium metal and its alloys are performed at Los Alamos National Laboratory (LANL) using a technique based on the Archimedes principle. The goal is to find and characterize a fluid for density determination of large objects made of plutonium to replace the currently used monobromobenzene. Physical and chemical properties must be considered while selecting the fluid. Chemical properties of the fluid must ensure low corrosion rates and good resistance to radiological decomposition. The study was carried on to evaluate the corrosion rates of Pu metal cause by FC-43 and the FC-43 decomposition products of radiolysis. The results of these studies proved favourable for this application. The evaluation of the surface reactions between FC-43 and Pu metal will be conducted in the near future.

scholarly journals Structure Determination of C23H19N4OBr from Synchrotron Data

2014 ◽  
Vol 70 (a1) ◽  
pp. C141-C141
Author(s):  
Ozen Ozgen ◽  
Engin Kendi ◽  
Semra Koyunoglu ◽  
Akgul Yesilada ◽  
Hwo-Shuenn Sheu
Keyword(s):  
Powder Diffraction ◽  
Structural Information ◽  
Chemical Properties ◽  
Biological Properties ◽  
Cell Parameters ◽  
Fundamental Understanding ◽  
Physical And Chemical ◽  
Radiation Research ◽  
And Chemical Properties

A significant part of medicine is based on the discovery and development of drugs. It is very important to know the crystal structure of pharmaceutical compounds for fundamental understanding of structure, physical and chemical properties. Many of these materials are available only as powders. So any structural information must be obtained from powder diffraction. I am going to present following the stages while solving the structure of C23H19N4OBr, 2-[3-phenyl-4(m-bromophenyl)-2-pyrazolin-1-yl]-3-methyl-4(3H)-quinazolinone, from 2-pyrazolines derivatives. The compounds are known to display various biological properties such as fungicidal insecticidal, anti bacterial, anti viral activities, pharmacological properties such as antiinflammatory agents and have industral properties(1). The powder diffraction data was collected with Debye Scherrer camera at the BL01C2 beamline at room temperature in National Synchrotron Radiation Research Center(NSRRC), Taiwan. X-ray of wavelength was 1.0333Å. This compound crystallizes in orthorhombic system space group P bca, Z=8, unit cell parameters of a=25.83(1)Å, b=15.55(5)Å, c=10.63(3)Å, and V=4266.0(10)Å3. Reliability factors were reached Rwp=0.075, Rp=0.053, RB=0.086 ve S=1.31 after Rietveld refinement.

scholarly journals RESEARCH OF THE SYNTHETIC, PHYSICAL AND CHEMICAL PROPERTIES OF 3-ALKYLSULFONYL-5-(CHINOLINE-2-YL, 2-HYDROXYCHINOLINE-4-YL)-4-R -2,4-DIHYDRO3N-1,2,4-TRIAZOLES 1

2016 ◽  
Vol 10 (1) ◽  
pp. 81
Author(s):  
Kaplaushenko Tm ◽  
Panasenko Oi ◽  
Kucheryavy Yu
Keyword(s):  
Biological Effects ◽  
Chemical Properties ◽  
Biological Action ◽  
Pharmacological Properties ◽  
Physical And Chemical Properties ◽  
Element Analysis ◽  
Fundamental Research ◽  
Physical And Chemical ◽  
And Chemical Properties

ABSTRACTObjective: Fundamental research in pharmacy and medicine have shown that drugs, which are based on nucleus of the 1,2,4-triazole, have a widerange of biological effects. Derivatives of this heterocyclic system have well-known Ukrainian clinicians and the world scientists due to its antifungal,antidepressant, anticancer, cardio- and hepatoprotective properties. The pharmacological activity of most organic compounds depends on severaldifferent factors, including bioavailability of the substance. Hence, it is very important to consider the results of the synthetic and biological researchesand established dependence of structure on the biological action when scientists model new molecules or improve pharmacological properties of anexisting structure. One of the important social and economic problems of the pharmaceutical industry is the implementation in practice of new drugsthat could compete with expensive imported drugs. In recent times, 1,2,4-triazole-3-thioderivatives take attention of compatriots and scientists offoreign countries who are working on finding bioactive compounds including heterocyclic systems. The structure, physical and chemical properties,pharmacological activities of 1,2,4-triazoles, and their 3-thioderivatives are understudied. Hence, the study of that will be actually and novelty formodern science. The main purpose of our research is synthesis of 3-alkylsulfonyl-5-(chinoline-2-yl, 2-hydroxychinoline-4-yl)-4-R-2,4-dihydro-3N1,2,4-triazoles,studyingof its physicaland chemical properties.Methods: The initial compounds have been synthesized previously using known in literature techniques. Oxidation of the sulfur atom of thesynthesized compounds to the hexavalent condition was carried out adding solution of hydrogen peroxide.Results: The structure of the obtained compounds was determined with the modern physical and chemical analysis methods: Element analysis,infrared-spectrophotometry, and their individuality with thin layer chromatography.Conclusions: Prospect of the further researches is determination of acute toxicity and next studying of pharmacological properties of the synthesizedcompounds.Keywords: 1,2,4-triazoles, Synthesis, Chemical properties, Chinoline.1 

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