scholarly journals Boat-shaped enkolpiobracelets: the areal peculiarities

2020 ◽  
Vol 28 ◽  
pp. 329-333
Author(s):  
Svetlana Kochkurkina ◽  
Keyword(s):  
Ferrous Metal ◽  
Lake Ladoga ◽  
Northern Coast ◽  
Hollow Part

Boat-shaped bracelets with a bulging middle hollow part are represented by two types: those with free ends and examples with hinged terminals. The first type is known in the monuments of the Karelian Istmus and northern coast of Lake Ladoga, the second type is represented at barrows on the Oyat’ river.They are complicated in manufacture and because of the use of expensive non-ferrous metal and are made most probably at the order of elite jewellery workshops.

Assessing the environmental conditions of rivers on the northern coast of Lake Ladoga by chemical characteristics and the structure of hydrobiocenoses

2016 ◽  
Vol 43 (3) ◽  
pp. 486-494 ◽  
Author(s):  
S. F. Komulainen ◽  
P. A. Lozovik ◽  
A. N. Kruglova ◽  
I. A. Baryshev ◽  
N. A. Galibina
Keyword(s):  
Environmental Conditions ◽  
Lake Ladoga ◽  
Chemical Characteristics ◽  
Northern Coast

Diatoms in the Early Valdai (Weichselian) sediments in Lake Ladoga basin

2019 ◽  
pp. 225-228
Author(s):  
Anna V. Ludikova
Keyword(s):  
Species Diversity ◽  
High Energy ◽  
Lake Ladoga ◽  
Diatom Assemblages ◽  
Marine Diatoms ◽  
Selective Preservation

The pioneer diatom study of the Early Weichselian (Valdai) sediments in Lake Ladoga basin was performed. The specifics of the diatom assemblages (co-occurrence of ecologically incompatible taxa, poor species diversity, low diatom concentration and selective preservation) suggest that during the Early Weichselian time intense erosion of previously deposited marine Eemian (Mikulino) sediments prevailed, which resulted in re-deposition of marine diatoms. The sedimentation took place in high-energy environments unfavorable for diatom accumulation and preservation.

Challenges and threats to the economic security in the ferrous metallurgy

2020 ◽  
Vol 8 (8) ◽  
pp. 1527-1544
Author(s):  
I.L. Ryabkov ◽  
N.N. Yashalova
Keyword(s):  
Ferrous Metallurgy ◽  
Financial Management ◽  
Ferrous Metal ◽  
Economic Security ◽  
Competitive Advantages ◽  
Corporate Strategies ◽  
Group Methods ◽  
Production Distribution ◽  
The Impact ◽  
Market Strategies

Subject. The article focuses on market strategies of the Russian enterprises operating in the ferrous metallurgy. Objectives. The study is to analyze corporate strategies the leading ferrous metal manufacturers use in the Russian Federation, such as NLMK Group, Severstal, Magnitogorsk Iron & Steel Works, EVRAZ Group. Methods. The study interprets public financial statements and methods of the logic, intuitive and comparative analysis. Results. We analyze market strategies of the Russian metal manufacturers, determine their development priorities and competitive advantages and weaknesses. We describe the impact of various threats and measures metallurgical companies undertake to eliminate them. Conclusions and Relevance. We sorted out possible threats and exposures of the Russian metallurgic companies' economic security and traced the dynamics of their significance for 2015 to 2019. Key threats relate to policies, economy, external and internal market, regulations and laws, production, distribution and financial management, consumption, IT, social welfare and environment.

Pathology of the upper gastrointestinal tract when exposed to non-ferrous metal aerosols

2020 ◽  
pp. 809-810
Author(s):  
M. V. Sheenkova
Keyword(s):  
Gastrointestinal Tract ◽  
Ferrous Metal ◽  
Upper Gastrointestinal Tract ◽  
Subjective Symptoms ◽  
Upper Gastrointestinal

A survey of 65 workers of PJSC «MMC Norilsk Nickel» was conducted to assess the lesions of the upper gastrointestinal tract and to identify features of subjective symptoms when exposed to industrial aerosols of different composition.

On Riccia marginata and related species (Ricciaceae, Marchantiophyta)

2012 ◽  
Vol 46 ◽  
pp. 298-305 ◽  
Author(s):  
A. D. Potemkin ◽  
T. Ahti
Keyword(s):  
Related Species ◽  
Lake Ladoga ◽  
Leningrad Region ◽  
Sem Images ◽  
North Shore ◽  
The North ◽  
Molecular Studies ◽  
The Future ◽  
The Town

Riccia marginata Lindb. was described by S. O. Lindberg (1877) from the outskirts of the town of Sortavala near the north shore of Lake Ladoga, Republic of Karelia, Russia. The species has been forgotten in most recent liverwort accounts of Europe, including Russia. Lectotypification of R. marginata is provided. R. marginata shares most characters with R. beyrichiana Hampe ex Lehm. It differs from “typical” plants of R. beyrichiana in having smaller spores, with ± distinctly finely areolate to roughly papillose proximal surfaces and a narrower and shorter thallus, as well as in scarcity or absence of marginal hairs. It may represent continental populations of the suboceanic-submediterranean R. beyrichiana, known in Russia from the Leningrad Region and Karelia only. The variability of spore surfaces in R. beyrichiana is discussed and illustrated by SEM images. A comparison with the spores of R. bifurca Hoffm. is provided. The question how distinct R. marginata is from R. beyrichiana needs to be clarified by molecular studies in the future, when adequate material is available. R. marginata is for the time being, provisionally, included in R. beyrichiana.

THE LANDSCAPE INVESTIGATIONS AS NECESSARY PART OF BIOLOGICAL STUDY IN THE COASTAL ZONE TO THE QUESTION OF THE IMPACT OF CLIMATE CHANGE ON THE ECOLOGICAL STATE OF ARTIFICAL

2017 ◽  
Author(s):  
Artem Lapenkov ◽  
Artem Lapenkov ◽  
Yury Zuyev ◽  
Yury Zuyev ◽  
Nadezhda Zuyeva ◽  
...  
Keyword(s):  
Coastal Zone ◽  
Benthic Communities ◽  
Great Depth ◽  
Research Strategy ◽  
Biological Study ◽  
Lake Ladoga ◽  
Coastal Zones ◽  
Investigation Methods ◽  
Ground Conditions ◽  
The Impact

Coastal zones have great diversity of resources. The shallow water zones contain the most of plant and benthic communities. A description of relief and type of ground is needed for the rigorous monitoring of biota and environmental condition of coastal zone. Generally, on the basis of these data the investigation methods of the coastal zone are selected. The shallows research strategy has been developed by us for northern part of the Lake Ladoga. If the coastal areas are characterized by great depth and flat topography, then sonar’s can be used to describe them and samples of ground can be taken by bottom grabs. In the Lake Ladoga these methods don’t operate correctly by reason of the compound bottom relief and the fact that a sizeable part of the bottom is occupied by hard ground. Therefore, our investigations base on the diving transect method of Golikov and Skarlato (1965). A diver moves along transects. He registers the depth, length to coastline, water temperature, relief and ground, edificators and records video. In the laboratory all these data are decoded and used for mapping of bays. Studies of plant communities have been performed and strategy for research of benthic communities in complex relief and hard ground conditions has been developed based on the descriptions of shallow waters. Description of the Malay Nikonovskia Bay bottom has given an opportunity to estimate changes in the bottom of the bay under the influence of the trout farm.

Study of the Effect of Crude Oils on the Metallic Corrosion

2018 ◽  
Vol 5 (1) ◽  
pp. 43-54
Author(s):  
Suresh Aluvihara ◽  
Jagath K Premachandra
Keyword(s):  
Crude Oil ◽  
Sulfur Content ◽  
Salt Content ◽  
Ferrous Metal ◽  
Relative Weight ◽  
Oil Refining ◽  
Crude Oils ◽  
Hardness Tester ◽  
Corrosion Rates ◽  
Ferrous Metals

Corrosion is a severe matter regarding the most of metal using industries such as the crude oil refining. The formation of the oxides, sulfides or hydroxides on the surface of metal due to the chemical reaction between metals and surrounding is the corrosion that  highly depended on the corrosive properties of crude oil as well as the chemical composition of ferrous metals since it was expected to investigate the effect of Murban and Das blend crude oils on the rate of corrosion of seven different ferrous metals which are used in the crude oil refining industry and investigate the change in hardness of metals. The sulfur content, acidity and salt content of each crude oil were determined. A series of similar pieces of seven different types of ferrous metals were immersed in each crude oil separately and their rates of corrosion were determined by using their relative weight loss after 15, 30 and 45 days. The corroded metal surfaces were observed under the microscope. The hardness of each metal piece was tested before the immersion in crude oil and after the corrosion with the aid of Vicker’s hardness tester. The metallic concentrations of each crude oil sample were tested using atomic absorption spectroscopy (AAS). The Das blend crude oil contained higher sulfur content and acidity than Murban crude oil. Carbon steel metal pieces showed the highest corrosion rates whereas the stainless steel metal pieces showed the least corrosion rates in both crude oils since that found significant Fe and Cu concentrations from some of crude oil samples. The mild steel and the Monel showed relatively intermediate corrosion rates compared to the other types of ferrous metal pieces in both crude oils. There was a slight decrease in the initial hardness of all the ferrous metal pieces due to corrosion.

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