scholarly journals Successive processes at quarry waste dumps of various ages

2021 ◽  
Vol 63 (4) ◽  
pp. 289-299
Author(s):  
Aleksandr Smirnov ◽  
Gavakhirat Mutalibova ◽  
Vyacheslav Leontyev ◽  
William Lozano-Rivas
Keyword(s):  
Chemical Properties ◽  
Carbonate Content ◽  
Quantitative Composition ◽  
Ph Values ◽  
Basal Soil Respiration ◽  
Waste Dumps ◽  
The Russian Federation ◽  
Physical And Chemical ◽  
Succession Processes ◽  
Rate Of Succession

Abstract This work is dedicated to the study of the succession processes in quarries of different ages in the territory of the Russian Federation and neighbouring countries, namely, Kazakhstan and Ukraine. In selected soil samples from the areas studied, certain physical and chemical properties, the quantitative composition of microbial communities and the diversity of floral species from the quarries were studied. The pH values for the Kuzbass area were found to decrease to 4.8, and in the area of the younger quarries – Inguletsky and Sokolovsky – higher pH values were recorded. The basal soil respiration rate of the Kuzbass quarry was approximately 0.2 mg CO2/g/h. The CO2 carbonate content ranged from 0.05% to 0.6%. The microbial biomass in Kuzbass soil was from 0.87 to 5.10 μg C/g soil, while its quantity in other quarries was 6 times lower, which is associated with the relatively young age of these sites. The study of the diversity of floral species in the Kuznetsk coalfield identified 120 species of upper plants belonging to 34 families. Among them, cereals, legumes and mosses, lichens and algae were predominant. In the territory of Inguletsky and Sokolovsky quarries, the diversity of plant species was much poorer. In this regard, further research will focus on increasing the rate of succession and maintaining ecosystem stability by increasing the share of microorganisms. Also, the study of the possibility to accelerate the restoration of younger flora in the discharges of age careers at the expense of the mycorrhizal communities formation is of high relevance.

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.

Methodological approaches to modeling the conditions for the formation of technological losses of oil and petroleum products due to evaporation from tanks

2020 ◽  
Vol 10 (4) ◽  
pp. 386-393
Author(s):  
Кonstantin Е. Lesnykh ◽  
◽  
Aleksey А. Korshak ◽  
Nafis N. Khafizov ◽  
Andrey A. Kuznetsov ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Petroleum Products ◽  
Quantitative Composition ◽  
Number Of Factors ◽  
Main Pipelines ◽  
Pumping Rates ◽  
Mathematical Relationships ◽  
Physical And Chemical ◽  
Storage Temperatures ◽  
And Chemical Properties

The conditions for the formation of technological losses of oil and petroleum products during transportation through the main pipelines are considered and it is established that the main sources of these losses are large and small airflows of reservoirs. The value of technological losses from evaporation from tanks depends on a large number of factors, in particular: storage temperatures, pumping rates, tank filling heights, physical and chemical properties of the transported liquid, tanks turnover. Until now, a unified approach to the procedure for determining the qualitative and quantitative composition of technological losses from the evaporation of hydrocarbons during storage has not been developed, which leads to disagreements in assessing the actual losses of energy carriers. According to the analysis, it was found that the best is the calculation method for determining the actual irrecoverable losses of hydrocarbons. Its application involves the use of mathematical relationships that describe the dynamics of evaporation of oil and petroleum products in real conditions. To establish such relationships, it is proposed to develop and implement a unit that enables simulation of the process of evaporation from tanks under various conditions and obtaining experimental data taking into account a combination of a variety of factors that affect the amount of the technological losses.

scholarly journals The kinetic parameters of aerosols formed during combustion of modified wood

2018 ◽  
Vol 251 ◽  
pp. 02023
Author(s):  
Feodor Portnov
Keyword(s):  
Grain Size ◽  
Surface Layer ◽  
Chemical Properties ◽  
Quantitative Composition ◽  
Kinetic Properties ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
The Impact ◽  
And Chemical Properties ◽  
Modified Wood

The paper studies kinetic properties of aerosols formed in thermal degradation of wood. The impact of modifying agents in wood surface layer on the quantitative composition of smoke aerosol solids was analyzed. For this purpose, grain-size of aerosol solids was analyzed, and the physical and chemical properties of source and modified wood were assessed.

scholarly journals Factors Affecting the Setting Time of Fly Ash-Based Geopolymer

2016 ◽  
Vol 841 ◽  
pp. 90-97 ◽  
Author(s):  
Antoni ◽  
Stephen Wibiatma Wijaya ◽  
Djwantoro Hardjito
Keyword(s):  
Fly Ash ◽  
Initial Temperature ◽  
Ph Value ◽  
Setting Time ◽  
Chemical Properties ◽  
Curing Temperature ◽  
Factors Affecting ◽  
Ph Values ◽  
Physical And Chemical ◽  
And Chemical Properties

Fly ash is a waste from coal burning, that are generated with fluctuation both in its physical and chemical characteristics. This characteristics of fly ash when used in the making of geopolymer concrete will greatly affect the final products obtained. The pH value measured in fly ash, according previous research, can influence the setting time of geopolymer and fly ash with high pH values can cause flash-setting in the concrete. Understanding more clearly about the factors that affect the setting time of fly ash based geopolymer is important for further progress and development of the material. It was found that factors that influence the setting time of geopolymer was not only from the physical and chemical properties of the fly ash itself. Other factors such as composition and mix design, manufacturing process and environmental conditions can also affect its setting time. The experimental results showed that fly ash particle size, CaO and MgO content, in addition to ratio of sodium silicate and sodium hydroxide in the alkali solution, molarity of NaOH, initial temperature of the mixture, curing temperature, and mix volume could potentially influence the setting time of the geopolymer mixture.

scholarly journals Influence of the Addition of Calcium Hydroxide Powder on Some Physical and Chemical Properties of the Sealer MTA Fillapex

2012 ◽  
Vol 3 (2) ◽  
pp. 180-183
Author(s):  
Marcelo Ferrarezi de Andrade ◽  
Renato de Toledo Leonardo ◽  
Edson Alves de Campos ◽  
Milton Carlos Kuga ◽  
Marco Antonio Hungaro Duarte ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Calcium Release ◽  
Ph Value ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Ph Values ◽  
The One ◽  
Physical And Chemical ◽  
The Impact ◽  
And Chemical Properties

ABSTRACT Objective This study evaluated the flow, pH and calcium release of MTA Fillapex (G1) or Fillapex plus 10% in weight of calcium hydroxide powder (G2), compared to AH Plus (G3) and Sealapex (G4). Materials and methods The flow test was performed according to ISO 6876:2001 requirements. The sealers were placed into plastic tubes and immersed in deionized water. After 24 hours, 7, 14 and 28 days, the water of each tube was removed and tested to evaluate the pH values and the level of released calcium. Calcium release values were analyzed statistically by Kruskal Wallis and Dunn tests and pH values analyzed by ANOVA and Tukey tests (α = 5%). Results G1 presented higher flow among all sealers. The addition of 10% calcium hydroxide into MTA Fillapex reduced the flow (p < 0.05) but, in a level, that is lower than the one recommended for ISO norms. G2 and G4 presented pH values and calcium release higher than G3 (p < 0.05) in all periods. G1 presented pH value higher than G3 (p < 0.05), except in 7 days period (p > 0.05). G4 presented higher pH values than G1 and G2, but the calcium release was similar for all periods (p > 0.05). G3 presented lower calcium release among all groups (p < 0.05). Conclusion The addition of 10% calcium hydroxide in MTA Fillapex caused reduction in flow and no negative interference in pH and/or calcium release. However, the obtained flow is different from ISO requirements. Clinical relevance MTA Fillapex presents levels of flow above the ISO norms. The addition of calcium hydroxide is a suggestion for solving this problem, but the impact of these procedures should be carefully evaluated. How to cite this article Keine KC, Guiotti FA, Leonardo RT, Kuga MC, Duarte MAH, de Campos EA, de Andrade MF. Influence of the Addition of Calcium Hydroxide Powder on Some Physical and Chemical Properties of the Sealer MTA Fillapex. World J Dent 2012;3(2):180-183.

scholarly journals Substratos no desenvolvimento de cultivares de gérbera envasada

2015 ◽  
Vol 21 (2) ◽  
pp. 177
Author(s):  
Fernanda Ludwig ◽  
Dirceu Maximino Fernandes ◽  
Amaralina Celoto Guerrero ◽  
Roberto Lyra Villas Bôas
Keyword(s):  
Dry Matter ◽  
Ornamental Plants ◽  
Chemical Properties ◽  
Dry Mass ◽  
Chemical Characteristics ◽  
Physical And Chemical Properties ◽  
Ph Values ◽  
Aerial Parts ◽  
Physical And Chemical ◽  
And Chemical Properties

The gerbera is a prominent culture that has gained in the Brazilian market of flowers and ornamental plants and there is a great demand for adequate substrates for its production. This study was conducted to evaluate the growth and distribution of dry mass and nitrogen in potted gerbera, depending on the substrates and cultivars. Experimental design was randomized blocks in a 5x2 factorial arrangement (5 substrates and 2 cultivars). Red and Cherry cultivars were evaluated at 1, 15, 29, 43 and 50 days of acclimation (DAA) to the leaves number, leaf area, dry mass of aerial parts (leaf and flower) and accumulation of nitrogen. From 29 DAA, the inflorescence has established as the drain and has contributed significantly to the total dry mass. The accumulation of nitrogen was similar in vegetative and reproductive periods. The traits evaluated varied depending on the substrate used, influenced by physical and chemical properties of the same. The growth, dry matter and nitrogen distribution potted gerbera cultivars Cherry and Red are influenced by physical and chemical characteristics of substrates, with better results in substrates with bulk density of less than 530 kg m-3 and pH values between 5.5 and 6.8

scholarly journals COMPARISON OF THE PHYSICAL AND CHEMICAL PROPERTIES BETWEEN CONTAINER-GROWN WOODY ORNAMENTALS

HortScience ◽  
1994 ◽  
Vol 29 (7) ◽  
pp. 730e-730
Author(s):  
April D. Edwards ◽  
Steven E. Newman ◽  
Adolph J. Laiche
Keyword(s):  
Pore Space ◽  
Chemical Properties ◽  
Hibiscus Cannabinus ◽  
Pine Bark ◽  
Physical And Chemical Properties ◽  
Woody Ornamentals ◽  
Fiber Core ◽  
Ph Values ◽  
Physical And Chemical ◽  
And Chemical Properties

Kenaf (Hibiscus cannabinus) is an alternative fiber crop being grown in Mississippi that maybe used as a tree-less fiber substitute for making paper. A by-product in this process is the pithy light-weight fiber core. The objective of this study was to examine the chemical and physical properties of kenaf fiber core as a medium component in growing woody ornamentals and compare to pine bark. Comparisons of media in which Ilex crenata `Cherokee' and Rhodoendron eirocarpum `Wakabuisi' were grown were made. The physical and chemical properties including bulk density, total pore space, water retention, pH and soluble salt concentrations were determined. Aged kenaf had lower pH values than fresh and both aged and fresh kenaf had higher pH values than pine bark. The total pore space of kenaf was lower than the pore space of pine bark. At the termination of the study, the kenaf media had considerable shrinkage, which was considered unsuitable for a long-term crop.

scholarly journals Pandemic COVID-19. Prevention Measures in the Russian Federation

2020 ◽  
Vol 19 (2) ◽  
pp. 4-12
Author(s):  
N. I. Briko ◽  
I. N. Kagramanyan ◽  
V. V. Nikiforov ◽  
T. G. Suranova ◽  
O. Р. Chernyavskaya ◽  
...  
Keyword(s):  
Russian Federation ◽  
Chemical Properties ◽  
Prevention Measures ◽  
Healthcare Facilities ◽  
The World ◽  
Global Spread ◽  
The Russian Federation ◽  
Biological Protection ◽  
Physical And Chemical ◽  
And Chemical Properties

Relevance. Humanity has been confronted with the global spread of dangerous viral diseases for centuries. Today a new coronavirus, SARSCoV-2, has been added to the list of potentially pandemic pathogens.The purpose of the article is to highlight, as much as possible, the physical and chemical properties of coronavirus, its epidemiology, framework for the disease prevention and treatment in various population groups and healthcare workers. The article provides a list of regulatory documents, a detailed guidance for healthcare professionals on how to act in case of identifying a patient with suspected COVID-19 in healthcare facilities, and a description of the coronavirus disease outbreak situation in the world and in the Russian Federation.Conclusions. The sanitary protection of the territories of the countries represents the main way to shield a population from a dangerous infectious disease. Therefore, the collaboration of physicians from all over the world and constant exchange of information among them is of crucial importance. The COVID-19 pandemic requires decisive, coordinated, global quarantine measures; biological protection of the population, collaboration on the vaccine’s development and treatment methods, and joining efforts against the panic and misinformation.

scholarly journals Characterization of some physical and chemical properties of post-bog soils developed from limnic deposits in vicinity of lake Dubie (Western Pomerania, NW Poland)

2016 ◽  
Vol 67 (1) ◽  
pp. 24-31 ◽  
Author(s):  
Grzegorz Jarnuszewski
Keyword(s):  
Arable Land ◽  
Organic Matter Content ◽  
Chemical Properties ◽  
Matter Content ◽  
Carbonate Content ◽  
High Porosity ◽  
Physical And Chemical ◽  
Nw Poland ◽  
Bog Soils

AbstractPost-bog soils developed from limnic calcareous sediments are closely related to a young-glacial landscape and postglacial lakes in Northern Poland. The studies conducted in 2010–2012 on post-bog soils near lake Dubie (Równina Drawska, NW Poland), partially used as an arable land. The goal of research was to characterise some chemical and physical properties of post-bog soils developed from carbonate deposits near lake Dubie. The soils of the analysed area developed from lacustrine chalk and calcareous gyttja belong to black earth and mucky soils. Organic matter content in surface horizons ranged from 5.0 to 14.2%, content of CaCO3from 27.2 to 55.2%, the highest carbonate content was found in arable soil. The soils of the study area were characterised by a narrow C/N ratio, low level of total form of P and a high content of Ca. Specific density of surface horizons was in the range 2.49 to 2.58 Mg · m−3, bulk density from 0.445 to 1.212 Mg · m−3. High porosity was also found in the examined formations, from 0.826 in surface horizons and 0.700 m3· m−3in limnic deposits.

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