Coal's physical structure is known to affect high‐temperature coal conversion processes such as gasification or combustion. This paper is Part II of the study of brown coal char structural changes during gasification. Firstly, German Lusatian brown coal was gasified in a laboratory‐scale fluidized bed reactor in CO2 within a temperature range of 800–950 °C at atmospheric pressure. Then, physical structure properties were extensively evaluated by means of various techniques. Char specific surface area and its changes during gasification reaction were evaluated using N2 and CO2 physical adsorption techniques. Adsorption isotherms were also interpreted employing unconventional methods in order to obtain the specific surface areas of pores of different sizes. Gasification kinetics were evaluated employing three widely applied kinetic models: the random pore model (RPM), the volume reaction model (VM), and the shrinking core model (SCM). Finally, the instantaneous gasification reaction rate was correlated with the char structural properties at the corresponding conversion degrees. The closest linear correlation appeared between the gasification reaction rate and the specific surface area of mesopores (as determined by N2 adsorption). Furthermore, correlations of the other structural properties with char conversion are provided. Observed structural changes were compared with the assumptions of the kinetic models.
This paper suggests an approach for the use of a single paucicellular histological sample to investigate two characteristics indicative of the cell’s functional potential: 1) the content of telomerase reverse transcriptase (TERT) and 2) the telomere length. An algorithm has been suggested for the successive detection of the catalytic telomerase subunit with immunohistochemical staining and assessment of telomere length with Q-FISH on the same set of cells. The described approach uses three incontestable advantages of the FISH technique, namely, the possibility of analyzing target sequences in individual cells and paucicellular samples, the performance of several successive hybridization rounds with different FISH probes on the same sample, and the examination of genomic regions consisting of repeats. This approach has been applied to assess the TERT content and telomere length in cumulus cells from human cumulus-oocyte complexes obtained from assisted reproduction programs. This approach provides an opportunity to examine the correlation between the TERT content and telomere length in cumulus cells surrounding the oocyte and the oocyte's capacity for fertilization, as well as the subsequent pre- and post-implantation development of the resulting embryo.
Purpose: to consider the possibility of using the cavitation method of disinfection of livestock effluents with the possibility of their applying immediately for fertilizing agricultural crops and obtaining liquid and solid phases of organic-mineral fertilizers. Discussions. The presented technological schemes for preparation of livestock effluents allow them to be used without adding chemical reagents and keeping quarantine in lagoons, as well as to obtain environmentally friendly fertilizers, which is promising for organic agriculture. The introduction of the cavitation method for processing livestock wastewater allowed Sistema LLC to get rid of the specific smell characteristic of pig farms, to reduce the cost of utilizing manure, since the cost of treatment 1 m³ of wastewater on a cavitation generator-disperser is about 7.5 rubles/m³. The introduction of cavitated manure runoff under cultivated crops ensured an increase in productivity, an increase in biomass and an increase in the quality of cultivated crops. Conclusions. Cavitation treatment allows livestock wastewater to be immediately applied to agricultural fields and makes it possible to build livestock complexes without settling lagoon-silt sumps, which reduces the negative impact on the environment. Cavitation is an efficient and energy-saving, environmentally friendly direction of manure disposal, allows organic agriculture based on environmental principles. The obtained organic-mineral fertilizers are not much inferior to industrial fertilizers in terms of yield and surpass them in quality. The cavitation treatment technologies of livestock wastewater will allow farms to produce organic products, which, due to an increase in demand for such products, will increase the level of sales both in Russia and in countries whose inhabitants are the main consumers of organic products.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.