scholarly journals Geochemical composition of Holocene and Late Pleistocene ice wedges in the yedoma of Stanchikovsky Yar and near the Chersky town, Northern Yakutia

2021 ◽  
pp. 65-79
Author(s):  
Nadine Arkad'evna Budantseva ◽  
Yurij Kirillovich Vasil'chuk
Keyword(s):  
Late Pleistocene ◽  
Animal Origin ◽  
Geochemical Composition ◽  
Mean Values ◽  
Melted Snow ◽  
Level Ice ◽  
Ice Wedge ◽  
The Subject ◽  
Different Levels ◽  
Kolyma River

The subject of this research is the Late Pleistocene and Holocene ice wedges exposed near Chersky settlement, lower Kolyma River, and in the yedoma strata of the Stanchikovsky Yar on the Maly Anyuy River. In the yedoma of the Stanchikovsky Yar, multi-tiered syngenetic ice wedges were exposed at different levels – from 10 to 35 m above river level. Ice wedge in the lower tier was sampled in detail. In the yedoma strata near Chersky relatively small fragments of ice wedges up to 1.5 m wide and up to 2 m high were exposed. 1.5-2 km from Chersky within the lacusrtine-paludal depression Holocene ice wedges were exposed. Ice wedges in these three sections was sampled to clarify the geochemical conditions of their formation. It is shown that concentration of Na+, K+, Mg2+, Cl- and SO42- in Holocene and Late Pleistocene ice wedges is very low and mean values do not exceed 5 mg/L. The highest values were obtained for Ca2+, which corresponds to the predominance of this ion in the modern snow of Yakutia and indicates that ice wedges were formed mainly from melted snow. Rather high values of NO3-, reaching 14-27 mg/L, are quite likely due to the swampy environment within polygonal landscapes, where organic matter of both plant and animal origin is decomposed. For comparison, in the water of the Kolyma and Maly Anyu rivers, concentration of nitrates is quite low and does not exceed 0.3 mg/L.

scholarly journals Geochemical composition of ice wedges in the Batagay yedoma

2021 ◽  
pp. 70-92
Author(s):  
Yurij Kirillovich Vasil'chuk ◽  
Jessica Yur'evna Vasil'chuk ◽  
Nadine Arkad'evna Budantseva ◽  
Alla Constantinovna Vasil'chuk ◽  
Alexander Pavlovich Ginzburg
Keyword(s):  
Late Pleistocene ◽  
Ionic Composition ◽  
Chloride Ion ◽  
Geochemical Composition ◽  
Air Masses ◽  
Ice Wedge ◽  
The Subject ◽  
First Time ◽  
Dissolved Form ◽  
Suspended Form

The subject of this research is the syngenetic ice wedges stripped in the Batagaika crater (67°34 '49" N, 134°46 ' 19 " E), located 10 km southeast of the Batagay settlement. The assessment of macroelement composition of ice was conducted using “Stayer” ion chromatograph (Russia), the chloride ion detection limit is 0.02 mg/l. The article examines the ionic and macroelement composition of ice in suspended and dissolved forms in the Late Pleistocene syngenetic ice wedge of the Batagay yedoma. A comprehensive geochemical research of the Batagaika crater is carried out for the first time. The author explores the upper and lower ice wedges of different age. The main conclusions are as follows: 1) mineralization of Late Pleistocene ice wedge of the Batagay yedoma ranges from 66.56 to 424.8 mg/l, from ultra-fresh to slightly salted; by ionic composition, the ice is bicarbonate-calcium and corresponds to the snow formed under the influence of continental air masses; 2)  the share of Ca contained in the dissolved form does not exceed 20-30%’ as far as other elements, the share of Mg, K, Na, Al, Fe, Mn in the suspended form is over  90%; 3) by mineralization, the Pleistocene ice of Batagay yedoma coincides with the previously studied Pleistocene ice wedges of Yakutia and the Interior Alaska.

scholarly journals Oxygen isotope composition of the ice wedges of Ayon Island and Late Pleistocene and Holocene palaeotemperature reconstruction of the Northern Chukotka

2017 ◽  
pp. 92-104
Author(s):  
Yu. K. Vasil’Chuk ◽  
A. C. Vasil’Chuk
Keyword(s):  
Isotopic Composition ◽  
Oxygen Isotope ◽  
Late Pleistocene ◽  
Isotope Composition ◽  
Oxygen Isotope Composition ◽  
Geochemical Characteristics ◽  
The Holocene ◽  
Temperature Reconstructions ◽  
Ice Wedge ◽  
Kolyma River

Syngenetic ice wedges have been investigated in the Ayon Island. Their isotopic composition, geochemical characteristics of both ice wedges and enclosing sediment have been obtained; four ice-wedges stages have been distinguished. Paleo temperature reconstructions for Ayon Island and adjacent territories of northern Chukotka have been yielded at the basis of these results. It is observed almost identical trends in the distribution of ice-wedge isotopic characteristics in the island and in the lower reaches of the Kolyma River, as well as differences in the magnitude of isotopic oscillations during the transition from Late Pleistocene to the Holocene as compared to ice-wedges of the Lower Kolyma region.

Viable Nematodes from Late Pleistocene Permafrost of the Kolyma River Lowland

2018 ◽  
Vol 480 (1) ◽  
pp. 100-102 ◽  
Author(s):  
A. V. Shatilovich ◽  
A. V. Tchesunov ◽  
T. V. Neretina ◽  
I. P. Grabarnik ◽  
S. V. Gubin ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
Kolyma River

scholarly journals pH of exudate test in the physiological quality of crambe seeds

2016 ◽  
Vol 46 (6) ◽  
pp. 1014-1018 ◽  
Author(s):  
Charline Zaratin Alves ◽  
Lennis Afraire Rodrigues ◽  
Carlos Henrique Queiroz Rego ◽  
Josué Bispo da Silva
Keyword(s):  
Pearson Correlation ◽  
Raw Material ◽  
Mean Values ◽  
Tukey Test ◽  
Physiological Quality ◽  
The Subject ◽  
The Mean ◽  
C 30

ABSTRACT: Crambe is a rapeseed with high oil content and can be used as a winter cover or as a source of raw material for the production of biodiesel, however espite the growing interest in the culture, research on the subject is still incipient, especially concerning the seed production and analysis technology. The purpose of this study is to evaluate the physiological quality of crambe seeds, 'FMS Brilhante' cultivar, by testing the pH of exudate. Five seed lots were submitted to the determination of water content and the tests of germination and vigor (first count, emergence and tetrazolium). In the conduction of pH exudate test, temperatures (25 and 30oC), and periods of seed imbibition in water (15, 30 and 45 minutes) were tested. The experiment was conducted in a completely randomized manner, with four replicates, and the mean values were compared by the Tukey test at 5% probability; Pearson correlation between the pH of the exudate and initial tests was also made. Testing the pH of exudate is promising for separating lots of crambe seeds and the following combinations of 25°C/30 minutes or 30°C/45 minutes can be used.

scholarly journals Radicalisation of Adolescents and Youth: In Search of Explanations

2017 ◽  
Vol 13 (3) ◽  
pp. 32-40 ◽  
Author(s):  
A.D. Tikhonova ◽  
N.V. Dvoryanchikov ◽  
A. Ernst-Vintila ◽  
I.B. Bovina
Keyword(s):  
Young People ◽  
Main Part ◽  
Modern Society ◽  
Integral Characteristic ◽  
Modern World ◽  
Social Psychological ◽  
The Subject ◽  
Psychological Knowledge ◽  
Different Levels

The main purpose of the presented article is to reveal the potential of social psychological knowledge for the analysis of radicalisation of young people. In the introduction, the features of socialisation in the modern world are discussed. Special attention is drawn to the role of the Internet in the socialisation of adolescents and young people. It is noted that the dominance of audiovisual information contributes to the reduction of reflexivity and promotes the so-called clip thinking, which has become an integral characteristic of adolescents and young people. It is emphasized that life in the modern society is associated with a number of changes taking place simultaneously at different levels, and uncertainty has become its important feature. Extremism and radicalisation are considered as a reaction to uncertainty, a way to overcome it. The main part of the article is devoted to the analysis of models of radicalization describes in various works. Finally, perspectives of further investigation into the subject are outlined.

scholarly journals Ethnic peculiarities of fairy tale folklore of the bulgarians from Moldova as an element of traditional culture in a regional manifestation

2021 ◽  
Author(s):  
Nadejda Cara ◽  
Keyword(s):  
Fairy Tales ◽  
Interdisciplinary Research ◽  
Fairy Tale ◽  
Traditional Culture ◽  
Structural Features ◽  
Ethnic Culture ◽  
Republic Of Moldova ◽  
The Subject ◽  
The Republic ◽  
Different Levels

The article presents some research approaches to the fairy-tale folklore of Bulgarians from the Republic of Moldova. According to the author, the fairy-tales texts of Bulgarians from the Republic of Moldova, their semantic, symbolic, and structural features should be researched as a local (regional) variant of Bulgarian folklore. Identification of ethnocultural markers in the fairy-tales of local Bulgarians on some different levels (such as on the subject, ethno-social and spiritual (church-religious) level) will allow to identify some peculiarities in the adaptation process of Bulgarians that migrated to a new ethnocultural zone, as well as to identify the level of preservation of basic ethnic mentality under the conditions of new “mental environment”. Thus, the study of regional ethnic culture is an interdisciplinary research, which allows discovering how localization in time and space affects ethnic culture, in general, and oral folk art, in particular.

scholarly journals Ratio of isotopic parameters δ2H-δ18o in Late Pleistocene and Holocene ice wedge

2021 ◽  
pp. 19-43
Author(s):  
Nadine Arkad'evna Budantseva ◽  
Yurij Kirillovich Vasil'chuk
Keyword(s):  
Isotopic Fractionation ◽  
Atmospheric Precipitation ◽  
Yenisei River ◽  
Winter Snow ◽  
Snow Water ◽  
Normal Ratio ◽  
Ice Wedge ◽  
The Subject ◽  
Line Inclination ◽  
Continental Climate

The subject of this research is the ratio of isotopic parameters of deuterium of heavy oxygen in ice wedges. The authors considered such parameter as inclination of the line of the ration of deuterium of heavy oxygen in ice wedges. Proximal to GMLV (or LLMV) position of isotope values for ice wedge and inclination of the line proximate to 8 suggests that the ice wedge was formed from atmospheric precipitation (winter snow). The article provides separate examples of anomalous deuterium ratios of heavy oxygen with very low ration of line inclination, which in combination with the abnormally low dexc values indicate the indicate isotopic fractionation processes in snow before melting and/or melting snow water before filling frost-cutting cracks. Three author determines the three main types of ratios of deuterium m of heavy oxygen content in ice wedge: a) normal ratio δ2H-δ18O (with line inclination of the ratio proximate to GLMV or LLMW). b) ratio of deuterium  of heavy oxygen to deviation from GLMV or LLMW (with signs of change in the primary isotope signal of atmospheric precipitation), c) anomalous ratio of deuterium of heavy oxygen. It is shown that the first two types  are characteristic to most ice wedge under study in the vast part of the Russian cryolithozone from the European North to the east of Chukotka; the third type is obtained for several Holocene ice wedge in Transbaikal and upper Yenisei River. This may be explained by significant isotope transformation of snow cover in the conditions of distinctly continental climate.

scholarly journals The Ice-Rich Permafrost Sequences as a Paleoenvironmental Archive for the Kara Sea Region (Western Arctic)

2021 ◽  
Vol 9 ◽  
Author(s):  
I. D. Streletskaya ◽  
A. A. Pismeniuk ◽  
A. A. Vasiliev ◽  
E. A. Gusev ◽  
G. E. Oblogov ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
Marine Sediments ◽  
Isotope Composition ◽  
Kara Sea ◽  
Coastal Sediments ◽  
Organic Carbon Content ◽  
Ground Ice ◽  
Geochemical Composition ◽  
The Holocene ◽  
Mis 3

The Kara Sea coast and part of the shelf are characterized by wide presence of the ice-rich permafrost sequences containing massive tabular ground ice (MTGI) and ice wedges (IW). The investigations of distribution, morphology and isotopic composition of MTGI and IW allows paleoenvironmental reconstructions for Late Pleistocene and Holocene period in the Kara Sea Region. This work summarizes result of long-term research of ice-rich permafrost at eight key sites located in the Yamal, Gydan, Taimyr Peninsulas, and Sibiryakov Island. We identified several types of ground ice in the coastal sediments and summarized data on their isotopic and geochemical composition, and methane content. We summarized the available data on particle size distribution, ice chemical composition, including organic carbon content, and age of the enclosing ice sediments. The results show that Quaternary sediments of the region accumulated during MIS 5 – MIS 1 and generally consisted of two main stratigraphic parts. Ice-rich polygenetic continental sediments with syngenetic and epigenetic IW represent the upper part of geological sections (10–15 m). The IW formed in two stages: in the Late Pleistocene (MIS 3 – MIS 2) and in the Holocene cold periods. Oxygen isotope composition of IW formed during MIS 3 – MIS 2 is on average 6‰ lower than that of the Holocene IW. The saline clay with rare sand layers of the lower part of geological sections, formed in marine and shallow shelf anaerobic conditions. MTGI present in the lower part of the sections. The MTGI formed under epigenetic freezing of marine sediments immediately after sea regression and syngenetic freezing of marine sediments in the tidal zone and in the conditions of shallow sea.

scholarly journals Frequency of number of roots and root canals of maxillary first premolar teeth.

2021 ◽  
Vol 28 (10) ◽  
pp. 1513-1518
Author(s):  
Munawar Aziz Khattak ◽  
Sana Arbab ◽  
Syed Amjad Shah
Keyword(s):  
Statistical Significance ◽  
Maxillofacial Surgery ◽  
P Value ◽  
Cross Sectional ◽  
Mean Values ◽  
Khyber Pakhtunkhwa ◽  
Root Canals ◽  
India Ink ◽  
Different Levels ◽  
Chamber Floor

Objective: To determine the frequency of the number of roots and root canals in a sample of 250 extracted maxillary first premolar teeth of patients visiting Peshawar Dental College and Hospital Khyber Pakhtunkhwa. Study Design: Cross Sectional. Setting: Department of Oral Biology, Peshawar Dental College and Hospital Khyber Pakhtunkhwa. Period: April 2016 to December 2016. Material & Methods: A total of 250 extracted human maxillary first premolars were collected from the Department of Oral & Maxillofacial Surgery, Peshawar Dental College, and Hospital Khyber Pakhtunkhwa. All teeth were visually inspected to count the number of roots. Subsequently, the access cavity was prepared, and pulp extirpated from each tooth. Endodontic explorer was used to locating the canal orifice(s) at the pulp chamber floor. Later the root canal orifices were injected with India ink to stain the canals. After that roots of teeth were sectioned at different levels to note down the number of canals. Data were analyzed using SPSS version 19. The statistical significance of the variations from mean values was considered significant if the p-value was less than 0.05. Results: Out of 250 maxillary first premolar teeth, 44.8% had one root, 40.4% had two separate and 12.8% had two fused roots. Three roots were seen in 2.0% teeth. Two root canals were present in the vast majority (70.4%), whereas one and three root canals were seen in 27.6% and 2.0% teeth, respectively. The correlation between the number of roots and root canals of maxillary first premolar teeth was highly significant. Conclusions: There was a high frequency of maxillary first premolars with two roots and two root canals.

scholarly journals Geoinformation analysis of spatial location of flood susceptible settlements in Yakutia

2021 ◽  
pp. 16-23
Author(s):  
Viktoriia Viktorovna Filippova
Keyword(s):  
Socioeconomic Development ◽  
Statistical Data ◽  
Spatial Location ◽  
Lena River ◽  
Different Types ◽  
Archival Documents ◽  
Analytical Processing ◽  
The Subject ◽  
The Republic ◽  
Kolyma River

The subject of this research is the structure and content of the developed by the author Geographic Information System (GIS) “Flood susceptible settlements in the territory of Sakha Republic (Yakutia)”. The object of this research is 128 floodable settlements included in the list of the established flood zones in the Sakha (Yakutia), their analytical processing and cartographic interpretation. The sources for the creation of GIS contain published sources, statistical data, passports of socioeconomic development of the municipalities, archival documents, and information provided by the departmental organizations. The author conducted different types of geoinformation analysis (analysis of the geography of settlements by river basins, dynamics of the number of floods in the settlements (for the period 1929 – 2017), density of floodable settlements) in ArcGIS. It is determined that most of the settlements susceptible to flood are located in the middle reach  the Lena River and along its major tributaries – Aldan, Amga, Olekma; in the northeast of Yakutia, floodable settlements are mainly located in the upper reaches of the rivers Yana, Indigirka, Alazeya, as well as in the lower and middle reaches of the Kolyma River and its tributaries. The author notes that in some settlements, the number of floods over the period from 1930 to 2017 amounted to 30-40. It is also indicated that highest density of the settlements susceptible to flood is observed in Central Yakutia in the places of the highest concentration of population in the republic. The developed GIS can be used for adopting recommendations to protection the settlements from flooding.

Sign in / Sign up

Export Citation Format

Share Document