The impact of early smelting on the environment of Huoshiliang in Hexi Corridor, NW China, as recorded by fossil charcoal and chemical elements

2011 ◽  
Vol 305 (1-4) ◽  
pp. 329-336 ◽  
Author(s):  
Xiaoqiang Li ◽  
Nan Sun ◽  
John Dodson ◽  
Ming Ji ◽  
Keliang Zhao ◽  
...  
Keyword(s):  
Chemical Elements ◽  
Hexi Corridor ◽  
Nw China ◽  
The Impact

Elemental status of the adult able-bodied population of the Republic of Buryatia

2019 ◽  
pp. 308-313
Author(s):  
Inna Yu. Tarmaeva ◽  
Anatoliy V. Skalny ◽  
Olga G. Bogdanova ◽  
Andrey R. Grabeklis ◽  
Alexandr I. Belykh
Keyword(s):  
Inductively Coupled Plasma ◽  
Chemical Elements ◽  
Federal District ◽  
Significant Degree ◽  
Electrolyte Imbalance ◽  
Scientific Development ◽  
Inductively Coupled ◽  
Elemental Status ◽  
The Republic ◽  
The Impact

Introduction.The study of the elemental status of the population of individual regions of the Russian Federation with the purpose of scientific development and implementation of measures for elimination of revealed elementosis is a promising direction for preventive medicine.The aim of the studyis to study the elemental status of the adult able-bodied population of the Republic of Buryatia, which was part of the Siberian Federal district (SFD) until 2018.Materials and methods.The analysis was performed by inductively coupled plasma mass spectrometry (ICP-MS) on the basis of the accredited laboratory of “Center of biotic medicine”. (Moscow; ISO 9001: 2008 certificate 54Q10077 from 21.05.2010). The content of chemical elements in the hair of 130 adults (102 women and 28 men) aged 25–50 years was studied. This indicator serves as an indicator in assessing the impact of the environment on the human body. Methods of nonparametric statistics were used for mathematical processing of the data.Results.For women living in the Republic of Buryatia, the maximum values of Zn, increased levels of Cu, Li, Si were revealed; for men — the maximum values of Mg, Cr, Si, increased levels of P, Li, Se, V, Pb. Minimum values were found for P, Fe, V. Elemental status indicates a significant degree of prevalence of essential trace element deficiencies and electrolyte imbalance. The obtained data can be used as reference values for the content of chemical elements in the hair of adults living in the Republic of Buryatia.Conclusions:Elemental analysis of the population of the Republic of Buryatia indicates imbalances among the adult working-age population.

scholarly journals Characteristics of Cr-B Coatings Produced on Vanadis® 6 Tool Steel Using Laser Processing

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2621
Author(s):  
Aneta Bartkowska
Keyword(s):  
Corrosion Resistance ◽  
Tool Steel ◽  
Laser Processing ◽  
Chemical Elements ◽  
Steel Substrate ◽  
Processing Parameters ◽  
Beam Power ◽  
Laser Beam Power ◽  
High Microhardness ◽  
The Impact

The paper presents the results of a study of the microstructure, chemical composition, microhardness and corrosion resistance of Cr-B coatings produced on Vanadis 6 tool steel. In this study, chromium and boron were added to the steel surface using a laser alloying process. The main purpose of the study was to determine the impact of those chemical elements on surface properties. Chromium and boron as well as their mixtures were prepared in various proportions and then were applied on steel substrate in the form of precoat of 100 µm thickness. Depending on the type of precoat used and laser processing parameters, changes in microstructure and properties were observed. Coatings produced using precoat containing chromium and boron mixture were characterized by high microhardness (900 HV0.05–1300 HV0.005) while maintaining good corrosion resistance. It was also found that too low laser beam power contributed to the formation of cracks and porosity.

scholarly journals QUALITY ASSESSMENT TERRITORY ADJACENT TO THE «DRILLING EQUIPMENT PLANT»

2015 ◽  
Vol 4 (2) ◽  
pp. 68-71
Author(s):  
Marina Yuryevna Garitskaya ◽  
Alina Ivanovna Baitelova ◽  
Ludmila Andreevna Pikus ◽  
Kristina Andreevna Kosacheva
Keyword(s):  
Land Surface ◽  
Chemical Elements ◽  
Machine Building ◽  
Industrial Complex ◽  
Orenburg Region ◽  
Industrial Enterprises ◽  
Drilling Equipment ◽  
The Military ◽  
The Impact ◽  
The City

Soil, performing a number of important functions is the geomembrane and affects the flow of most processes in the biosphere. Wherein geochemical processes occurring in the soil play an important role in the fate of contaminants as organic matter while controlling their redistribution in the ecosystem between its various components are generally leads to the formation of stable areas of contamination. The soil not only geochemically components accumulates contaminants, but also acts as a natural buffer that controls the transfer of chemical elements and compounds in the atmosphere. Around industrial enterprises formed geochemical anomalies with high content of pollutants, which can reach a radius of 10-50 km, and the impact of large industrial centers can be traced to a distance of 100 km. All known processes of metal accompanied by the formation of large amounts of waste that pollutes air, water and land surface. Mechanical engineering is an important industry of the Orenburg region and is represented by enterprises of the military-industrial complex, agricultural machinery, machine tools, equipment for ferrous and non-ferrous metals, vehicles, electric household appliances. In the machine-building complex of the Orenburg region includes more than 70 large enterprises. The share of engineering products in the volume of industrial production is about 8%. In this case, the natural environment of the city of Orenburg slabozaschischena from most adverse geo-environmental factors. Based on this, we carried out a study on the quality of soil and environmental situation prevailing in the city of Orenburg, in the zone of influence of the enterprise Plant drilling equipment.

scholarly journals The Scarcity of Specific Nutrients in Wild Bee Larval Food Negatively Influences Certain Life History Traits

Biology ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 462
Author(s):  
Zuzanna M. Filipiak ◽  
Michał Filipiak
Keyword(s):  
Life History ◽  
Body Mass ◽  
Behavioral Ecology ◽  
Life History Traits ◽  
Chemical Elements ◽  
Nutritional Ecology ◽  
Larval Food ◽  
Male Mortality ◽  
Wild Bee ◽  
The Impact

Bee nutrition studies have focused on food quantity rather than quality, and on details of bee biology rather than on the functioning of bees in ecosystems. Ecological stoichiometry has been proposed for studies on bee nutritional ecology as an ecosystem-oriented approach complementary to traditional approaches. It uses atomic ratios of chemical elements in foods and organisms as metrics to ask ecological questions. However, information is needed on the fitness effects of nutritional mismatches between bee demand and the supply of specific elements in food. We performed the first laboratory feeding experiment on the wild bee Osmia bicornis, investigating the impact of Na, K, and Zn scarcity in larval food on fitness-related life history traits (mortality, cocoon development, and imago body mass). We showed that bee fitness is shaped by chemical element availability in larval food; this effect may be sex-specific, where Na might influence female body mass, while Zn influences male mortality and body mass, and the trade-off between K allocation in cocoons and adults may influence cocoon and body development. These results elucidate the nutritional mechanisms underlying the nutritional ecology, behavioral ecology, and population functioning of bees within the context of nutrient cycling in the food web.

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