scholarly journals EFFECT OF AMBIENT TEMPERATURE ON THE HUMIFICATION OF PLANT LITTER

2017 ◽  
Vol 21 (10) ◽  
pp. 199-205
Author(s):  
Y.V. Simonov
Keyword(s):  
Small Groups ◽  
Plant Litter ◽  
Effect Of Temperature ◽  
Plant Residues ◽  
Humus Substances ◽  
Chemical Studies ◽  
Humus Acids ◽  
Humus Accumulation ◽  
Degree Of Maturity ◽  
Physical And Chemical

Techniques of laboratory microecosystems, small groups of arthropods and physical and chemical studies are shown. On the basis of instrumental studies the effect of temperature on the ratio of the processes of mineralization and humification of plant residues with the participation of small arthropods is computed. Analysis of the results of measurements of indicators of the process ofhumification clearly reveals that the temperature of the plant material affects the intensity of humus accumulation and on indicators of the degree of maturity of humus acids. Activity of microarthropods reduces the dependence of accumulation of humus substances on the temperature.

scholarly journals STUDIES OF THE ORGANIC ORIGIN CHEMICAL COMPOUNDS OF BROWN COALS AND CARBONIZED PLANT RESIDUES FROM NORTHERN TIMAN

2020 ◽  
pp. 55-64
Author(s):  
Lyudmila Sergeyevna Kocheva ◽  
Anatoliy Petrovich Karmanov ◽  
Vladimir Pavlovich Lutoev ◽  
Sergey Aleksandrovich Pokryshkin
Keyword(s):  
Komi Republic ◽  
Plant Residues ◽  
Quantitative Chemical Analysis ◽  
A Value ◽  
Maximum Value ◽  
Brown Coals ◽  
Middle Timan ◽  
Chemical Studies ◽  
Physical And Chemical ◽  
Paramagnetic Properties

The results of the physical and chemical studies of the organic matter of Devonian brown coals and rocks with carbonized plant residues from Northern Timan (Russian Arctic) are presented. We used a complex of physical and chemical methods, including IR spectroscopy, EPR spectroscopy, quantitative chemical analysis, pyrolytic gas chromato-mass spectrometry. For comparative studies we used Devonian (Middle Timan) and Jurassic (Griva, Komi Republic, Russia) carbonized plant residues and lignins, isolated from modern wood and non-wood plants. Organic structures of aromatic nature, which are products of the metamorphic transformation of lignins of coal-forming plants, were found in the investigated samples. It was shown that lignin’s relics show pronounced paramagnetic properties, mainly due to the presence of phenoxyl radicals. The concentration of paramagnetic centers reaches a value that is close to the maximum value nорг for carbonaceous substances. Based on quantitative analysis of phenolic products of pyrolysis the composition of lignin relics was calculated, taking into account the ratio of the main structural H, G and S units. Experimental data allowed to put forward the hypothesis that in the composition of Devonian coal-forming plants, as one of the first representatives of forest communities on the planet, included compositionally homogeneous protolignins of H-type, built mainly from p-coumaric structural units.

scholarly journals Physical and Chemical Studies on Ceruloplasmin

1965 ◽  
Vol 240 (5) ◽  
pp. 1974-1978 ◽  
Author(s):  
Philip Aisen ◽  
Anatol G. Morell
Keyword(s):  
Chemical Studies ◽  
Physical And Chemical

scholarly journals Physical and Chemical Studies of a Limited Reaction of Iodine with Proteins

1959 ◽  
Vol 234 (6) ◽  
pp. 1447-1451
Author(s):  
Leon W. Cunningham ◽  
B. Joanne Nuenke
Keyword(s):  
Chemical Studies ◽  
Physical And Chemical

scholarly journals Physical and Chemical Studies on Ceruloplasmin

1969 ◽  
Vol 244 (13) ◽  
pp. 3494-3496 ◽  
Author(s):  
A G Morell ◽  
C J A Van Den Hamer ◽  
I H Scheinberg
Keyword(s):  
Chemical Studies ◽  
Physical And Chemical

scholarly journals DFT calculation for the electronic properties and quantum capacitance of pure and doped Zr2CO2 as electrode of supercapacitors

2021 ◽  
Author(s):  
Shuo Xu ◽  
Shi-Jie Wang ◽  
Li Xiao-Hong ◽  
Hong-Ling Cui
Keyword(s):  
Electronic Properties ◽  
Electrode Materials ◽  
Chemical Properties ◽  
Effect Of Temperature ◽  
Quantum Capacitance ◽  
Substitutional Site ◽  
Level Shifts ◽  
Dirac Distribution ◽  
Increasing Temperature ◽  
Physical And Chemical

Defect and doping are effective methods to modulate the physical and chemical properties of materials. In this report, we investigated the structural stability, electronic properties and quantum capacitance (Cdiff) of Zr2CO2 by changing the dopants of Si, Ge, Sn, N, B, S and F in the substitutional site. The doping of F, N, and S atoms makes the system undergo the semiconductor-to-conductor transition, while the doping of Si, Ge, and Sn maintains the semiconductor characteristics. The Cdiff of the doped systems are further explored. The B-doped system can be used as cathode materials, while the systems doped by S, F, N, Sn atoms are promising anode materials of asymmetric supercapacitors, especially for the S-doped system. The improved Cdiff mainly originates from Fermi-level shifts and Fermi-Dirac distribution by the introduction of the dopant. The effect of temperature on Cdiff is further explored. The result indicates that the maximum Cdiff of the studied systems gradually decreases with the increasing temperature. Our investigation can provide useful theoretical basis for designing and developing the ideal electrode materials for supercapacitors.

scholarly journals PHYSICAL AND CHEMICAL STUDIES OF OVERROOF ROCKS OF CLAY SHALES OF THE DZHERDANAK DEPOSIT

2021 ◽  
pp. 16-21
Keyword(s):  
Electron Microscopy ◽  
Fine Structure ◽  
Chemical Properties ◽  
Mineralogical Composition ◽  
Physical And Chemical Properties ◽  
X Ray ◽  
Clay Shales ◽  
Chemical Studies ◽  
Physical And Chemical ◽  
And Chemical Properties

The purpose of this study is study of the physical and chemical properties of the overburden of the Dzherdanak deposit. The chemical and mineralogical composition of the overburden of the Djerdanak deposit has been studied by the methods of X-ray and thermography, electron microscopy and infrared spectroscopy. The main phases are quartz, kaolinite and muscovite. The study of the fine structure of the rock under an electron microscope showed the homogeneity of the rock with pronounced uniform inclusions, which is preserved even after firing. Changes in the rock after firing at 1050 °C have been determined. The formation of mullite at this temperature has been established.

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