scholarly journals Carbon and nitrogen ratio in the soils of the lithalsa landscapes in Sentsa River valley, East Sayan

2020 ◽  
pp. 75-97
Author(s):  
Alla Constantinovna Vasil'chuk ◽  
Jessica Yur'evna Vasil'chuk ◽  
Nadine Arkad'evna Budantseva ◽  
Yurij Kirillovich Vasil'chuk ◽  
Elena Vyacheslavovna Terskaya ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Soil Formation ◽  
River Valley ◽  
Parent Rock ◽  
Illuvial Horizon ◽  
Carbon And Nitrogen ◽  
Porcelain Mortar ◽  
Nitrogen Ratio ◽  
Carbon And Nitrogen Content ◽  
Peat Horizon

The subject of this study is the ratio of carbon and nitrogen content in the soil of the lithalsa landscape in the Sentsa River valley. The focus is on the spatial distribution of C/N ratio in the genetic soil horizons: humus (A), illuvial (B), the parent rock(C), as well as in the buried peat horizon (T). The carbon and nitrogen content is analyzed in 70 samples using the element analyzer C, H, N, S –O EA 1110. Sample preparation included drying the soil through a sieve and grinding it with a rubber pestle in a porcelain mortar. It is found that cryogenic concentration of soil solutions, cryogenic heaving, thermokarst, zoogenic turbations, peat burial, and alluvial loam deposition are the main processes determining the peculiarity of soil formation within lithalsa landscapes. The maximum variation in the ratio of carbon and nitrogen content is observed in the illuvial horizon, while in the humus horizon and in the parent rock, as well as in the buried peat horizon, this indicator is of a smaller range.

scholarly journals Role of carbon and nitrogen in the improvement of corrosion resistance of new powder metallurgy Co-Cr-Mo alloys

2020 ◽  
Vol 38 (3) ◽  
pp. 273-286 ◽  
Author(s):  
Cristina Garcia-Cabezon ◽  
Celia Garcia-Hernandez ◽  
Maria L. Rodriguez-Mendez ◽  
Gemma Herranz ◽  
Fernando Martin-Pedrosa
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Nitrogen Content ◽  
Powder Metallurgy Technique ◽  
Carbon And Nitrogen ◽  
Physiological Conditions ◽  
Carbon And Nitrogen Content ◽  
Astm F75

AbstractMicrostructural changes that result in relevant improvements in mechanical properties and electrochemical behavior can be induced using different sintering conditions of ASTM F75 cobalt alloys during their processing using powder metallurgy technique. It has been observed that the increase in carbon and nitrogen content improves corrosion resistance and mechanical properties as long as the precipitation of carbides and nitrides is avoided, thanks to the use of rapid cooling in water after the sintering stage. In addition, the reduction of the particle size of the powder improves hardness and resistance to corrosion in both acid medium with chlorides and phosphate-buffered medium that simulates the physiological conditions for its use as a biomaterial. These results lead to increased knowledge of the role of carbon and nitrogen content in the behavior displayed by the different alloys studied.

Carbon and Nitrogen Scope for Growth as A Function of Diet in the Sea Scallop Placopecten Magellanicus

1991 ◽  
Vol 71 (2) ◽  
pp. 437-450 ◽  
Author(s):  
Jonathan Grant ◽  
Peter J. Cranford
Keyword(s):  
Nitrogen Content ◽  
Clearance Rate ◽  
Absorption Efficiency ◽  
Placopecten Magellanicus ◽  
Scope For Growth ◽  
Carbon And Nitrogen ◽  
Tissue Weight ◽  
Sea Scallop ◽  
Feeding Experiments ◽  
Carbon And Nitrogen Content

Laboratory feeding experiments with the sea scallop Placopecten magellanicus were carried out to compare scope for growth (SFG) to measured growth and determine the effect of diet on carbon and nitrogen SFG. Diets consisting of cultured phytoplankton, kelp detritus, and resuspended sediment were provided daily for 52 days (October-December). Measurements of clearance rate, absorption efficiency, respiration, O/N ratio, and carbon and nitrogen content of diets and scallop tissue were used to construct carbon and nitrogenbudgets for each diet. Growth coefficients were calculated from change in tissue weight during the study period.

Carbon and nitrogen content based estimation of the fat content of animal carcasses in various species

2004 ◽  
Vol 58 (1) ◽  
pp. 37-46 ◽  
Author(s):  
S Kuhla ◽  
Monika Klein ◽  
Ulla Renne ◽  
W Jentsch ◽  
PE Rudolph ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Fat Content ◽  
Carbon And Nitrogen ◽  
Carbon And Nitrogen Content

scholarly journals Methane formation and consumption by sediments in a cross-channel profile of a small river impoundment

2019 ◽  
Vol 78 (2) ◽  
Author(s):  
Adam Bednařík ◽  
Martin Blaser ◽  
Martin Rulik
Keyword(s):  
Nitrogen Content ◽  
Surface Sediment ◽  
Methane Formation ◽  
Organic Carbon Content ◽  
Sediment Layer ◽  
Carbon And Nitrogen ◽  
Ch4 Emissions ◽  
Ch4 Production ◽  
Carbon And Nitrogen Content ◽  
Surface Sediment Layer

Rivers are a natural source of methane (CH4) into the atmosphere and may contribute significantly to total CH4 emissions. Even though the details of sources of CH4 in rivers are not fully understood, weirs have been recognized as a hotspot of CH4 emissions. In this study, we investigated CH4 production and consumption in air-exposed river sediments along a cross-channel transect located upstream of a weir. Stable carbon isotopes were used for determination of individual methanogenic pathways. In order to understand the relationship between physicochemical and biological processes, additional parameters such as organic matter, grain median size, and carbon and nitrogen content were characterized as well. Generally, samples from the surface sediment layer (0-10 cm) had higher CH4 production than sediments from the deeper layer (10-20 cm) during the incubation experiments. Sediments near the bank zones and in the mid-channel were characterized by the highest organic carbon content (6.9 %) as well the highest methanogenic activity (2.5 mmol g-1 DW d-1). The CH4 production was predominated by H2/CO2 dependent methanogenesis in the surface sediment layer (0-10 cm), while the proportion of acetoclastic and hydrogenotrophic methanogenesis in the deeper sediment layer (10-20 cm) was balanced. The CH4 oxidation potential of sediments showed the same spatial pattern as observed for the CH4 production. Our results showed high spatial variability of sediment CH4 production and oxidation in the cross-channel profile upstream of the weir, whereas the highest CH4 dynamics were observed in the littoral zones. This variability was closely linked with the carbon and nitrogen content in the sediment samples.

Soil Aggregates and their Associated Carbon and Nitrogen Content in Winter Annual Pastures

2010 ◽  
Vol 74 (4) ◽  
pp. 1339-1347 ◽  
Author(s):  
M. M. Anders ◽  
P. A. Beck ◽  
B. K. Watkins ◽  
S. A. Gunter ◽  
K. S. Lusby ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Soil Aggregates ◽  
Carbon And Nitrogen ◽  
Winter Annual ◽  
Carbon And Nitrogen Content
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