Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Climate stabilization and replacement of oil with alternative energy sources are urgent problems in the modern world. Space solar power plants [SSPP] can solve these problems simultaneously. Based on the review of literary sources, we raised one of the primary issues of the SSPP creation related to the need to identify the nature and the extent of its impact on the environment. First, we analyzed the environmental impact of the SSPP and traditional energy sources (thermal power plants, nuclear power plants, and hydroelectric power plants). Second, we considered the environmental impact of various wireless transmission methods of energy from the SSPP: ultrahigh-frequency (microwave) and infrared [IR] laser radiation, and the efficiency of energy transmission from the SSPP. One should emphasize the specific concept of efficiency for these power plants since they have an infinite energy source in the form of the Sun. Thus, the superiority of space solar power plants lies in the absence of nuclear radiation and chemical toxicity, a much higher efficiency, locality of impact (a site with a diameter of 40–50 m on Earth when broadcasting from a geostationary orbit), and a lower cost. For several reasons, mainly due to the terrorist threat, it is advisable to abandon the use of tethered balloons for receiving laser radiation above the clouds to eliminate losses in the atmosphere and carry out a live broadcast and reception of energy on the Earth, creating lasers operating in the windows of atmospheric transparency. One can use local illumination of the atmosphere during the operation of these power plants. The use of laser SSPP is especially relevant for solving the problems of the Arctic and continental shelf development with an extreme climate (taiga and tundra with swamps and permafrost) and for mobile objects and transport.

In the present study, a bibliometric analysis was carried out on the species Dermochelys coriacea in the Scopus database for the last ten years. Two inquiry analyzes were used (co-authorship and co-presence), from the VOSviewer version 1.6.17 software. The items Dermochelys coriacea, and Mexico were used to search for relevant publications. A total of 7 articles were found during the period 2010 - 2021, in each year there was at least one publication. The author who published the most on this species is García-Grajales (N=2) (Universidad del Mar) and the state that recorded the most articles on the species is Oaxaca (N=4). The topics of Ecology and Microbiology have been the most addressed and a total of 52 authors with articles on D. coriacea in Mexico were registered. The keywords provided by the authors of the articles were a total of 66, three of which reached the threshold. The words that appeared most frequently were: Dermochelys coriacea, leatherback and morphology.

The introduction of such plasticizers as tributyl phosphate and di-(2-Ethylhexyl)-sebacate [DEHS] into the composition of polyurethane elastomers, synthesized through the stage of epoxyurethane oligomer can significantly reduce the glass transition temperature, which expands the operating temperature range. The peculiarities of changes in the basic properties of the studied elastomers during plasticization are determined by their two-phase structure, which is characterized by hard urethane hydroxyl blocks.

According to the Federal State Statistics Service regarding respiratory diseases in Krasnoyarsk Krai, the increase in this indicator was 6% over the five years, and the increase in oncologic diseases was 4% over the same period. Polluted air is one of the leading causes of the increased incidence. The paper aims to find ways to clean indoor air using ion-electronic technology and bring the microclimate parameters to optimal values in cold and warm seasons. Experimental and theoretical studies substantiated the possibility of developing a device capable of creating and maintaining an air environment in closed premises, close in terms of indicators to the healthy air of ecologically clean regions. The device can have different performance and can be used in domestic, industrial, and public premises. Depending on the mode of operation and purpose, this device can be both stationary and mobile. Fine dust cannot be removed from the room even if the air exchange rate is increased by 200 and 400 times. It has been experimentally proven that ion-electronic technology and volatile matter of woody plants remove dust to achieve a clean room. This concept formed the basis for developing a device using nanotechnology combined with the volatile matter of woody plants. The dependences of the influence of artificial ionization of air and volatile matter of woody plants on reducing the amount of fine dust and pathogenic microflora are theoretically substantiated. The air purified in this way maintains immunity and reduces the incidence of respiratory diseases, which has been proven experimentally based on a prototype of the developed device.

The paper aims to compare the CO2, CO, CH, and O2 concentrations in the exhaust gases of Cummins KTA 50 diesel engines of BelAZ 75131 mining dump trucks equipped with an onboard cryogenic fuel system and running on diesel and gas-diesel fuel at coal mines of Kuzbass (Russia). The research novelty lies in determining ecological efficiency when using liquefied natural gas (methane) as a motor fuel for heavy-duty mining dump trucks. In the near future, the use of this type of motor fuel will minimize the anthropogenic impact on the environment by reducing harmful emissions and provoking the environmental safety of the region where a large amount of mining equipment is used in coal mining enterprises. The demand for mining dump trucks, their operating conditions, and the world experience in converting mining equipment to liquefied natural gas (methane) were briefly analyzed. The use of alternative fuel sources for heavy-duty mining trucks is a promising way to reduce harmful emissions into the atmosphere. This paper presents a research technique. The data on the study of the CO2, CO, and CH groups and O2 concentrations in the exhaust gases of Cummins KTA 50 diesel engines of BelAZ 75131 mining dump trucks hauling rock mass are presented. The obtained data on the CO2, CO, and CH groups and O2 concentrations during diesel and gas-diesel operation of empty and laden BelAZ 75131 mining dump trucks when going uphill and downhill were substantiated. The results of calculating the average weighted emissions of the CO2, CO, and CH groups in the exhaust gases of Cummins KTA 50 diesel engines were presented.

The paper describes the design of an electroosmotic device for treating dehydration of water-mineral-organic wastewater sludge from paper production and a methodology for conducting experimental studies. As for regression equations for the reduction factor of the waste mass, specific indicators were presented: drainage fluid consumption, current strength, power consumption, and energy, depending on the voltage on the electrodes and the duration of treatment. Besides, the required waste treatment function depends on the voltage and the required waste concentration. Equations and graphs were presented. In terms of the intensity of fluid excretion, it was found that the most effective treatment is performed during the first 0.5–0.7 h. At a voltage of about 25 V, the processing time of waste (until the mass of waste is reduced to 1/3) is about 0.75 h, and at a voltage of less than 10 V, it is about 3–5 h. With a decrease in the voltage, the liquid withdrawal slows down faster. By the magnitude of the current, the separation process lasts for the first 0.7–1.0 h. By the nature of the change in the current, the process is homogeneous (differing only in intensity) at a voltage of more than 8 V. At a lower voltage, the intensity of waste separation by current strength and an increase in the duration of processing decreases sharply. The power consumption is actively growing in the first 1–2 h of processing, gradually slowing down. Then we found the proportionality of power to the applied voltage. The increase in power was associated with a decrease in the distance between the electrodes. With a decrease in the mass of waste less than 50% of the initial value, energy is less efficiently used for separating waste, and the observed increase in energy consumption during further processing sharply increases energy consumption. To reduce the final mass of waste and obtain their concentrate, it was necessary to increase energy consumption. Waste processing should be stopped when 1/3 of the initial waste mass remains due to the actual cessation of the separation of waste fractions with an active increase in energy consumption.

The isolation of soil bacteria from various environments with exceptionally high fertility rates represents an opportunity to identify promising agents to promote agriculture production. The paper aims to study the densities of cultivable bacteria and isolate bacteria from the radish and spring wheat rhizosphere. Plants were grown in the pot experiment with virgin Chernevaya soil, which possessed extraordinary productivity, and zonal forest soil that did not demonstrate similar features. Fifty-nine bacterial isolates were purified and evaluated for their beneficial effects on the early growth of wheat. Isolates belonged to Proteobacteria, Actinobacteria, and Firmicutes phyla, and the most represented genera were Pseudomonas, Streptomyces, Paenibacillus, and Methylobacterium. These dominant bacteria were used in plant inoculation studies. Strains promoted a significant increase in shoot and root length and biomass, thus they may be considered plant growth-promoting rhizobacteria [PGPR]. Regarding biotest assays, strains that displayed high plant growth-promoting capabilities [PGP] were selected for further investigation. This study contributed to bacteria isolates from a unique natural environment with biotechnological potentials in improving plant growth and showed potency to be exploited as bioinoculants.

The Project Management Information System (PMIS) is a powerful tool in project management discussions due to its many benefits. Improper deployment of a PMIS and disregard for its qualitative factors influencing project success will never lead to the achievement of project goals. The purpose of this study was to investigate the impact of using PMIS on the cost management of construction projects that have used this information system. In this study, the impact of PMIS quality factors such as project quality, level of implementation technology, level of design skills, teamwork coefficient and execution time on project cost management was evaluated. The statistical population is the questionnaire of projects implemented through PMIS in construction projects, based on which 100 questionnaires were distributed among the projects and then collected. In this study, structural equation modeling has been used to investigate the research hypotheses. In this regard, "SPSS" software was used. The results of this study indicate that system quality, information quality and service quality have a positive effect on project success in terms of cost management.

In this paper, to determine the main knowledge streams of technological learning in joint R&D (JRD) projects in petroleum industry, the co- word analysis method is used. The knowledge map is drawn by reviewing 388 papers published in the study area from 2000 to 2021 in Scopus and Sage databases using VOSviewer1.6.16 software. Accordingly, by reviewing the existing knowledge, the two main concepts of knowledge management and technological innovation are identified. Then, using text mining method and drawing a concept knowledge map, 8 clusters are extracted and their relationships are analyzed using Netdraw software.  Finally, the study period from 2000 to 2021 is divided into three main categories: organizational - communication characteristics, economic goals and concepts of innovation, and shown the most focus in recent years is in the field of innovation concepts.

Controlling the moisture level is especially important when irrigating various crops to obtain a resistant, stable harvest and save water resources. Over moistening of the soil adversely affects the soil structure and can lead to salinization, waterlogging, and acidification. In addition, the formation of surface water runoff from the fields causes depletion of nutrients, oxygen starvation, and, ultimately, soil degradation. The degradation of fields (areas of the field) leads to the withdrawal of the field from crop rotation (exploitation), a reduction in acreage, the need for agrotechnical measures, reclamation, and, as a result, high financial costs. Currently applied irrigation technologies lead to the withdrawal of up to 50% of irrigated land. Therefore, the technology of differentiated irrigation with constant control over the condition of the soil and plants will help eliminate these negative consequences while increasing the yield and reducing the consumption of water, electricity, and labor costs. For the implementation of this technology, sensors are needed to control the moisture and temperature of the soil at different depths and perform operational control of the water supply to the field. The implementation of a constant connection between the field and the plant with the water supply system will allow creating digital irrigation map and forming of a database about the irrigated field underlying the information and created advisory system. The system for the continuous monitoring of soil moisture and temperature at different depths is based on IT technology with data transmission via radio communication channels. It uses platforms for data transmission via such communication channels as LoRaWAN (highly economical wireless communication interface from ICBCom), GSM (Groupe Spécial Mobile - the global standard for digital mobile cellular communication), and the Internet.