bluuebunny/crossref_metadata_2025 huggingface dataset:
Controlled power: how biology manages succinate-driven energy release
Authors: Mookerjee Shona A. , Gerencser Akos A. , Watson Mark A. , Brand Martin D.
Published: December 2021

Oxidation of succinate by mitochondria can generate a higher protonmotive force (pmf) than can oxidation of NADH-linked substrates. Fundamentally, this is because of differences in redox potentials and gearing. Biology adds kinetic constraints that tune the oxidation of NADH and succinate to ensure that the resulting mitochondrial pmf is suitable for meeting cellular needs without triggering pathology. Tuning within an optimal range is used, for example, to shift ATP consumption between different consumers. Conditions that overcome these constraints and allow succinate oxidation to drive pmf too high can cause pathological generation of reactive oxygen species. We discuss the thermodynamic properties that allow succinate oxidation to drive pmf higher than NADH oxidation, and discuss the evidence for kinetic tuning of ATP production and for pathologies resulting from substantial succinate oxidation in vivo.
Study on power load adjustment capacity of a 300MW cogeneration unit in heating season
Authors: Lao Jinxu , Zheng Wei , Zhu Lingkai , Guo Junshan , Lv haizhen
Published: December 2021

After the formulation of the "3060" double carbon target, the installed capacity of new energy has increased rapidly and the proportion of power generation has become higher and higher. In the heating season, under the operation mode of "determining electricity by heat" of cogeneration units, in order to meet the consumption of renewable energy and the heating guarantee of people's livelihood, the contradiction with power grid peak shaving is increasing. This paper mainly introduces the load capacity of a 300MW cogeneration unit in the heating season. Through the test method, find out the load capacity of the unit under different heating capacity, which can be used as a reference for power generation enterprises and power grid dispatching.
Mathematical model and influence factor analysis for productivity prediction of fractured-vuggy carbonate reservoir when drilling into cavern reservoir
Authors: Gong Yufeng , Fu Yan , Zhao Xinyi , Wen Kaifeng , Zhang Tao , Yan Jie , Li Chengquan , Li Chengyong
Published: December 2021

The seam hole type carbonate didn't touch type drill in the cave reservoir oil and gas resources is rich, but due to the large difference of unused reservoir capacity, capacity of main control factors and the evaluation model is not clear, so the reservoir is difficult to reasonable and effective development, in order to improve the cave reservoir development effect, find the factors influencing the cave reservoir capacity of the master,This article through to carry out the cave type carbonate reservoir capacity model test, the cave reservoir productivity prediction model is set up and analyze the factors affecting capacity, studies have shown that the wellbore storage coefficient and skin factor of cave type carbonate reservoir had a greater influence on the vertical well productivity, this paper research content for the cave type of carbonate reservoir reserves producing has a certain guiding significance.
Measurement of the coordination effect of polyphenols used in oil field by colorimetric method
Authors: Tian Wen , Liu Huanyu , Han Xiaoyu , Zhou Rui , Qu Le , Zhang Jie , Dong Sanbao
Published: December 2021

Polyphenols are widely used in drilling fluid, cement slurry and water treatment in oil fields. The paper is based on the characteristics of the abundant phenolic hydroxyl groups in plant polyphenol compounds that can form stable complexes with iron ions, and the characteristics of phenolic compounds forming blueviolet to brown complexes with iron salts, and the color of iron salts itself for light yellow, a color method is designed to evaluate the quality of polyphenols, which provides a simple and reliable method for the quality analysis of industrial polyphenols.
Preparation and performance evaluation of polyvinyl alcohol grafted polyacrylic acid for plugging
Authors: Liu Jiangbo , Ren Yi , Zhang Qin , Wang Xiangyun , Du Weichao
Published: December 2021

Well-leakage is a very difficult problem in the process of drilling at home and abroad. At present, it mainly relies on the cumulative effect of plugging slurry to implement plugging regardless of the number of times and costs. Commonly used plugging slurry and plugging technology are difficult to guarantee the success rate and scientific of plugging malignant leakage, which has an extremely bad impact on the development of the petroleum industry. In this study, With polyvinyl alcohol and acrylic acid as main agents, a plugging material of acrylic acid grafted polyvinyl alcohol was prepared, and the influence of the composition of the reaction system on the gel state of the system was studied. Through a series of singlefactor experiments, the best formula for preparing the plugging material was determined, polyvinyl alcohol and acrylic acid (specific gravity 1:3) + crosslinking agent (0.1wt%) + initiator (0.3wt%). The gel plugging agent using above formula to prepare has good gel strength and suitable gel time, and has a good application prospect in solving the problem of lost circulation.
Research on Capacity Configuration and Optimal Operation of Microgrid Energy Storage under Demand Management
Authors: Li Wensheng , Sun Donglei , Li Yajin , Wang Xian , Liu Rui , Yu Dayang
Published: December 2021

In order to reduce the energy consumption cost, considering the influence of the correlation of photovoltaic output, load demand and peak valley TOU price in different periods on the optical storage capacity configuration, the system operation strategy and capacity configuration principle are determined based on the peak valley TOU price and energy storage charge state information and the actual size of photovoltaic output and load.Integrated with the historical load, time of use electricity price, state of charge, charge discharge power and other constraints of the energy storage system, the minimum objective function is utilized to optimize the output power of energy storage.The effectiveness of the model is verified by an example. The sensitivity analysis shows that different demand tariff rules affect the user demand declaration strategy. The energy storage system planning selects the light storage combination with appropriate capacity according to the demand tariff rules and the change of energy storage investment cost, which has practical engineering value.
Construction and application of comprehensive early warning system for coal and gas outburst in Xinjing Coal Mine
Authors: Zou Yunlong
Published: December 2021

In order to further strengthen the prevention and control of coal and gas outburst in Xinjing Coal Mine, the online comprehensive analysis and early warning index system and rules of coal and gas outburst suitable for Xinjing Coal Mine were studied. Based on the corresponding early warning computer system and guarantee mechanism, a comprehensive early warning system for coal and gas outbursts in Xinjing Coal Mine was established, realizing real-time intelligent early warning of outburst dangers in working faces. The system realizes the standardization and dynamic management of outburst prevention information at the working face, as well as the real-time dynamic update and sharing of outburst prevention information, which improves the efficiency of mine outburst prevention management and the level of mine safety. The actual application of the system in Xinjing Coal Mine shows that the system can provide an effective reference for the comprehensive early warning of outbursts in other outburst mines of Yangquan Coal Industry Group.
Multi-stage Depressurization Analysis of Subsea Production System Based on LedaFlow Software
Authors: Chen Wenfeng , Ju Pengpeng , Wang Xueyuan , Wang Dong , Liu Feilong
Published: December 2021

This paper briefly summarizes that during the depressurization operation in subsea pipeline for maintenance or prevention of hydrate formation, because the flare knock-out drum pump is designed for ambient temperature, and cannot deal with the low temperature fluid in the depressurization process. Therefore, the low temperature fluid needs to be heated in the knock-out drum to meet the temperature requirement of pump. In order to avoid the volume of low temperature fluid exceeding the surge volume of the flare knock-out drum, the concept of multi stage depressurization is innovatively proposed in this paper, which meets both the requirements of pump temperature and the surge volume of flare drum. Taking a gas field project in the South China Sea as an example, the simulation analysis of depressurization temperature and pressure is carried out by using different size of the blowdown valve. It provides a good reference for the similar project in future.
Research and application of L-shaped ground well gas drainage technology in mining area
Authors: Fu Junhui
Published: December 2021

By law mining fracture morphology analysis, based on coal face gas flow characteristics, obtain the L-shaped surface well layout area in the mining area under the influence of mining. Analysis of overlying strata "three zones" distribution, the calculation method of the height of overburden rock "three zones" designed in mining area ground well structure proposed safety drainage system construction plan. In Sihe Mine was L-shaped ground mining area well engineering practice, the average gas production at a concentration of 80%, with an average drainage net amount 22 000 m3 / d, a total of more than 300 days running, drainaging 6.5 million CBM m3. After the implementation of drainage work surface corner gas content fell 46.5%, to effectively improve production efficiency, for the surface treatment gas play a key role. Successfully removed Mining Face Gas for safe production constraints, to protect the mining of coal mine safety, and achieved good social and economic results, with good promotional value.
Application of Green Power Generation Technology for Distributed Energy
Authors: Fu Qiang , Fu Chengxi , Fu Peng , Deng Yuke
Published: December 2021

This article discusses and analyzes the technical strengths and weaknesses of the green power generation that can be used for distributed system (power generation) power generation, for instance, solar power generation, wind power, hydrogen fuel cells, biomass power generation, and small gas turbines. The key to the discussion is to apply the technical distributed power generation of solar power stations. In addition, it also discussed the use of "focusing solar power generation high-temperature solar thermal power conversion system software" technical completion of distributed system power distribution. Low-cost, high-temperature solar thermal power generation is selected as the power generation solution medium, the power generation is technically low consumption and high-efficiency, the volume and power generation methods are conveniently equipped, the stability is high, and the economic development is environmentally friendly.
Investigation and Water quality Analysis of Agricultural nonpoint Source pollution in Tanxia Town
Authors: Yang Liya , Zhou Hao , Dai Liyuan
Published: December 2021

Taking the small watershed in Tanxia town as an example, the classified investigation of agricultural non-point source pollution in the tributaries of Lijiang River was carried out, the sources of local agricultural non-point source pollution were analyzed, and the surface water environmental quality standard and Nemero index method were used to evaluate the water quality of the basin. The results show that the water quality of the basin is poor and the pollution exceeds the standard all the year round, and the source of agricultural non-point source pollution mainly depends on the pollution of agricultural chemical fertilizer. Improving the use of local chemical fertilizer and rational application of chemical fertilizer are the key factors to improve local agricultural non-point source pollution.
Characteristics and potential area optimization of Oil layer A reservoir in T Oilfield
Authors: Gao Junhong
Published: December 2021

Oil layer A of T oilfield has a low development degree. At present, there are 5 medium and highyield wells in the area, showing a good evaluation and development prospect. In order to understand the reserve potential of this area, the reservoir forming law and reservoir characteristics are further analyzed by analyzing the structure and reservoir development characteristics. The research shows that Oil layer A has two types of reservoirs: one is structural reservoir, which is distributed in the large structural trap near the Aogula-Halahai fault zone in the east of the oilfield. It is characterized by close oil source, short migration path and stable reservoir development. It is a "large and enriched" reservoir. The other type is lithologic reservoir, which is distributed at the sedimentary end of the western structure of the oilfield, and is characterized by distant oil source. After long-distance secondary migration, it is greatly influenced by the development degree and physical properties of the reservoir, but it is a "small but fat" reservoir with high oil saturation. On the basis of clarifying reservoir types, characteristics and evaluation ideas, this paper carries out reserve optimization classification, and selects three potential areas: block Y1 and block Y2 which are mainly controlled by structure and block Y3 which is controlled by lithology.
Analysis of the Influence of Gas Distribution on Flora Structure and Oil Displacement Effect During Microbial Oil Displacement
Authors: Wang Chenying
Published: December 2021

In the context of the rapid development of my country's social economy, the total demand for energy in my country's industrial production continues to increase, of which petroleum energy is an important type of energy required in industrial production. At present, China's petroleum energy mainly depends on imports, so in order to promote the productivity of China's petroleum industry, we must carry out comprehensive innovation of oil displacement technology. Microbial oil displacement is an important technical means, which needs to accurately grasp the factors affecting the oil displacement effect, so as to optimize and innovate the technology. Therefore, this paper will deeply study and analyze the influence of gas distribution on flora structure and oil displacement effect in the process of microbial oil displacement, and put forward some reasonable opinions and measures to further promote the improvement of oil production technology.
Establishment of geology-engineering integration model for shale gas of Wei AH platform in Weiyuan Area
Authors: Jiang Hai , Xiao Yang , Liu Ziping , Li Zhigang , Deng Xiang , Zou Longqing
Published: December 2021

Wei AH platform is a platform composed of 8 horizontal wells in Weiyuan shale gas area. The number of faults in the area is small, and natural fractures are locally developed. Therefore, it is necessary to take volume reconstruction as the core mining technology and establish the geology-engineering integration model for the platform according to the geology-engineering integration concept. On the basis of geological model, combined with one-dimensional rock mechanics profile, the geomechanical model of Wei AH platform is established by means of deep diagenetic theory. Based on geological model and geomechanical model, the well trajectory design model, fracturing design model and reservoir numerical simulation model are modeled and optimized respectively. Finally, it can realize the comprehensive application of geophysical, geological, mechanical and seepage data, and complete the mutual call and matching of all kinds of understanding and models.
Study on carbon emission accounting of warm mix asphalt mixture
Authors: Wu Chengqun , Shi Wenyu , Shao Haoming
Published: December 2021

At present, the international community emphasizes reducing carbon emissions, and the national level includes carbon peaking and carbon neutralization as development goals. As a landmark material for energy conservation and emission reduction in road engineering, the research on carbon emission accounting needs to be further refined. Based on the introduction of the basic concept, development process and current situation of carbon emission accounting of warm mix asphalt mixture, this paper focuses on the most novel and recognized energy consumption accounting method and carbon emission calculation method at home and abroad. The research results of carbon emission accounting in the production, transportation and construction of warm mix asphalt mixture are introduced in detail. Finally, the research on carbon emission accounting of this material is evaluated at the present stage and prospected in the future.
Analysis of logging parameter model of Jurassic complex reservoir in Xinjiang Shenquan Oilfield
Authors: Li Yanjie , Wang Yitong , Ding Hansheng , Ma Yongyi , Shen Yan , Chu Lilan , Nie Zhiyang , Du Jinxia , Shao Zhaoyi , Gao Qicai , Wang Shuheng
Published: December 2021

The study discusses the characteristics of Jurassic reservoir in Shenquan Oilfield in Xinjiang. The reservoir of Qiketai Sanjianfang formation mainly develops delta front facies and shore shallow lake facies sand bodies.The lithological characteristics of the reservoir are mainly fine sandstone and siltstone, and the physical properties of the target layer are mainly medium porosity and medium permeability. The Jurassic reservoir space in Shenquan Oilfield is sandstone pore type, mainly composed of secondary pores, mainly including intergranular dissolved pores, intragranular dissolved pores and intercrystalline pores, with good connectivity between pores. According to the analysis data of well logging, core analysis, production performance and DST in Shenquan Oilfield, porosity, permeability and water saturation models are established respectively:The porosity interpretation model is established by using acoustic wave and shale content; the permeability parameter interpretation model is realized by applying graph based cluster analysis method and neural network algorithm. The oil saturation interpretation model is obtained by Archie formula. According to the logging interpretation model and interpretation results, it can meet the needs of reservoir evaluation, oil-water distribution and original geological reserve parameters. After analyzing the logging parameter model and reservoir parameter calculation method, it is considered that the Jurassic in the Shenquan Oilfield in Xinjiang has better physical properties.
Reservoir forming conditions and exploration potential of Lower Paleozoic carbonate rocks in Gucheng area, Tarim Basin
Authors: Zheng Liu , Liping Yan , Guoxin Sun , Hansheng Ding , Yanjie Li
Published: December 2021

The Gucheng region is oil and gas accumulation area of Tarim Basin，dominated by beach controlled lithologic oil and gas reservoirs，which has superior oil and gas accumulation conditions and broad exploration prospects. The lower Paleozoic strata in the Gucheng region are the Carboniferous, Ordovician, and Cambrian systems from top to bottom. The Silurian, Devonian, and Permian systems are missing. The lower Ordovician – Cambrian are the main exploration target layers in the area. There are four reservoirs: the Ordovician group, the Yingshan group, the Penglaiba group and the Cambrian group in The Gucheng region, The upper part of the Yijianfang formation and Yingshan formation are limestone reservoir, which is a set of potential reservoir. The lower part of the Yingshan formation, the Penglaiba formation, and the Cambrian formation developed three sets of dolomite reservoirs. The distribution of oil and gas in Gucheng region was mainly found in Yijianfang formation, Yingshan formation, Penglaiba formation and Cambrian of the Ordovician. The Yingshan group and the Hanwu group were the main exploration target layers. Yingshan formation and Cambrian are the main exploration targets, and Yijianfang formation and Penglaiba formation of Ordovician can be used as the concurrent exploration targets. Gucheng region can form two major realistic exploration areas: dolomite reservoir of Ordovician and reef beach of Cambrian. The Ordovician dolomite reservoirs are mainly searched for the inner shoal of the platform edge high-energy facies belt, and the Cambrian system is mainly search for the high-energy reef beach far away from the platform edge facies belt in the north of cherchen fault.
Study of seismic attributes recognition method of high quality igneous rock reservoir
Authors: Yitong Wang , Jingsheng Li , Zandong Sun Sam , Wei Qiao , Yanjie Li , Yongyi Ma , Yan Shen , Shuheng Wang
Published: December 2021

Aimed target area is deeply buried, complex lithology, dual media, reservoir development degree is controlled by a variety of factors, meanwhile, lateral thickness and lithofacies change rapidly, and strata formation is poor. Therefore, igneous rock reservoir has difficulty in predicting, since seismic is complicated to track trace, reservoir attribute analysis is hard to determine the time window, and inversion modeling requires sophisticated. By analyzing, the basalt in the target research area accounts for the principal component of the igneous rock, however, the igneous rocks with relatively developed reservoirs are mostly distributed in the trachyte breccia which has good productivity. The results of petrophysical study indicate that frequency-dependent AVO inversion method is an important means to identify fluid and reservoir prediction, notwithstanding it is difficult to distinguish high-quality reservoirs barely by P-wave impedance. Consequently, AVOF inversion method is appropriately proposed to identify igneous rock reservoir. Foremost, eliminating the effects of algorithm,frequency, spectrum balancing and other factors, then put the improved three-term Aki&Richards frequency-dependent AVO inversion method applying to distinguish igneous reservoir fluid and lithology, for the purpose of carrying out the identification of high-quality reservoirs.
Improvement and Application of Key Tools for Hydraulic Jet Fracturing
Authors: Zhang Yibo
Published: December 2021

Aiming at the problems of poor reliability, low construction efficiency, and short service life of fracturing string in the application of hydraulic jet technology in Daqing Oilfield, targeted research has been carried out on key tools such as rubber cylinder, slip, and nozzle.A unidirectionally-sealing rubber cylinder adopting composite sealing method was designed. The rubber cylinder could bear the pressure of 80 MPa and temperature resistance of 150∘C under the setting force of 20 kN, with tensile strength increased by 23% and residual deformation rate less than 3%, showing good overall sealing performance and recovery. The finite element method was used to optimize the structural parameters, materials and process of the slip to increase the ability of slips to withstand alternating loads by 1.5 times. The arc-shaped nozzle was improved to reduce the pressure drop and increase the jet density. By improving the performance indicators of key tools, the optimized fracturing string could meet the construction requirements of low setting force, high sealing pressure difference, and repeated setting and fracturing. The improved technical string was applied to section 3459 of well 218 well in the field, with the success rate reaching 100%. The large-scale application of the improved fracturing string satisfied the construction requirements for large-scale volume fracturing of the for the 5 1/2" inch casing new well completion in the low-permeability and tight reservoirs of Daqing Oilfield.
Study on Reasonable Injection-Production Parameters of Water-Flooding Reservoir: A Case Study of Daqing Oilfield
Authors: Nie Cong
Published: December 2021

This paper, by conducting comprehensive analysis on water-flooding reservoir, intensively studied and discussed the characteristics of geological development, determined the evaluation indexes of development effect, carried out research from five steps, the first is the introduction part, it conducted indepth study and discussion from research background, research significance, literature review, and research methods four aspects. The second outlined the related theory from the optimization principle and mechanism of injection-production parameters, and the distribution mechanism of remaining oil two aspects. The third analyzed the current situation of reasonable injection-production of water-flooding reservoirs in Daqing Oilfield from reservoir characteristics and reservoir deposition. The fourth evaluated the water-flooding development effect from combined water cut, changing conditions of production and predicted recovery ratio. The fifth intensively studied the reasonable injection-production parameters of water- flooding reservoirs in Daqing oilfield from design of separated layer water injection plan, maintaining level reservoir formation pressure, and reasonable plan of injection-production ratio and oil recovery rate three aspects, and provides theoretical guidance for later targeted excavation of water-flooding reservoirs.
Evaluation of the influence of geographical factors on the difficulty of grid operation cost
Authors: Zhang Geli , Zhang Heng , Zheng Yan , Liu Yaqiong , Li Tong , Wang Meibao , Wang Xiaohui
Published: December 2021

The cost of power network operation and maintenance is affected by many factors, which will affect the cost. Among the many influencing factors, the geographical environment is one of the more important factors. The influence of geographical factors on cost is realized by geographical conditions including distance, topography, climate, etc. . When the distance is longer, the topography is more complex, and the climate change is more severe, for the operation and maintenance costs will have a higher increase in the effect.This paper analyzes the process that the internal and external composing mechanism of Power Grid Enterprise's operation cost is affected by geographical factors, and analyzes the influence way and result of geographical factors on power grid's operation cost.
Atmospheric environmental monitoring and evaluation based on experimental statistical methods
Authors: Sun Lihong
Published: December 2021

With the gradual improvement of social economy, the ecological environment is gradually deteriorating. In order to obtain higher economic benefits, enterprises often sacrifice the natural environment. After entering the new era, the public pays more and more attention to the ecological environment, and the relevant state departments also begin to use a variety of scientific and technological means to monitor the environment in order to obtain accurate information, find pollution problems in time, and take effective measures to control them. This is of great significance to improve the problem of environmental pollution. In this paper, combined with the actual situation, the application and layout methods of atmospheric environmental monitoring are analyzed in detail, in order to provide reference and reference for the related work in the future. In this paper, it is pointed out that atmospheric environmental monitoring is the process of measuring the concentration, observation and analysis of the change of pollutants in the atmosphere and the shadow response of the environment. The experimental statistical method is the product of the digital age, and it has its own advantages for monitoring the atmospheric environment, such as climate assessment, environmental assessment, atmospheric disaster prevention and early warning, etc., all based on the application of the experimental statistical method. Taking the digital measurement as the cut-in point, this paper describes the object and appearance of atmospheric monitoring, and focuses on the application strategy of atmospheric environmental monitoring test statistics, in order to clarify the importance of digital measurement and provide reference.
Research on Prediction Methods of Wellbore Hydrate Formation of Ultra-Deep Gas Wells in Northwest Sichuan
Authors: Liu Qilin , Yang Jian , Du Lang , Jiang Jianxun , Ni Dan , Zheng Rong , Luo Zhaoqian , Liu Peng
Published: December 2021

According to the formation and handling situation of hydrate in ultra-deep high-pressure sulfurcontaining gas wells in northwest Sichuan, the formation conditions of natural gas hydrate was studied based on previous studies on hydrate, the molecular dynamics of natural gas hydrate and the multiphase flow law of high-temperature high-pressure high-sulfur-containing gas wellbore were combined, and the pressure prediction model with high-temperature high-pressure sulfur-containing gas wells as the target was built. The chemical and physical control methods of wellbore hydrate plugging were discussed to provide the scientific theoretical basis for the prediction and control of hydrate in high-temperature high-pressure high-sulfurcontaining gas wells.
Distributed solar panel heating scheme with auxiliary energy in Tibet
Authors: Zhou Liqing
Published: December 2021

Tibet is located in the high cold and high altitude, the ecological environment is fragile, and the clean utilization of energy has attracted much attention. On the basis of clean energy and reliable power supply, winter heating in Tibet is an urgent livelihood problem to be solved. Based on the current situation of solar heating in Tibet, a distributed solar flat heating scheme with auxiliary energy is proposed, and the heating dispatching mode is analyzed. The research results not only provide a solution for energy efficient and clean heating in Tibet, but also have a certain reference value for the construction of clean energy base in Tibet.
On the utilization and development of solar energy in Tibet
Authors: Wang Wenya
Published: December 2021

In order to better promote the application demonstration of clean energy such as solar energy, wind energy and geothermal energy in Tibet, scientifically develop and make rational use of new energy such as photovoltaic, photothermal, geothermal and wind power, optimize the energy supply structure, improve the guarantee capacity of energy use, and form a comprehensive energy system dominated by clean energy and complemented by other energy. This paper mainly discusses the importance, application and development of solar energy in Tibetan people's life by discussing the utilization of photoelectric and light and heat.
Study on a collecting structure for impact energy and its dynamic characteristics
Authors: Zhang Kai , Zhu Yongyong , Zhou Qizheng
Published: December 2021

The impact energy harvesting technology is studied in this paper, a piezoelectric harvesting structure with additional resonant structure including spring mass components is proposed, and the system dynamics model of the structure is studied. The influence of the structural parameters of spring mass block on the system output voltage is studied by using the model. The research results have certain application value for impact energy harvesting.
Econometric analysis of the capital structure of oil and gas companies in Russia
Authors: Filimonova Irina , Komarova Anna , Chebotareva Anastasia
Published: December 2021

The article is devoted to an in-depth study of the capital structure of oil and gas companies in Russia and the identification of key factors that affect the ratio of equity and debt capital. In the context of ongoing technological sanctions, an increase in the share of hydrocarbon production in the framework of capital-intensive projects for the development of hard-to-recover reserves and high depreciation of fixed assets, the need for investment, and justification of an effective borrowing strategy is sharpening.
Drive power calculation of a crushing machine working in shear
Authors: Nikitin Aleksandr , Kurochkin Nikita , Yang Yonghui
Published: December 2021

The description of crusher design is given, in which the destruction of the processed material occurs due to the forces acting on the crushed piece in the same plane towards each other, while in the processed piece only tangential stresses arise. It makes possible to reduce the energy consumption per unit of finished product by almost two times.
Operational research and diagnosis for service maintenance and repair of large-loaded equipment of the company Minetech Machinery LLC official dealer of Hitachi
Authors: Nedzelskaya Olga , Bikineeva Anna , Bulakina Elena , Moiseev Vladislav , Pochufarov Dmitry , Ketov Alexander
Published: December 2021

The mining industry is one of the main industries that determine the country’s energy sovereignty. This article studies the effectiveness of organizational and managerial decision making, a separate subdivision of Minetech Machinery LLC, an official dealer of mining equipment from Hitachi, on the territory of the Russian Federation.
Preprocessing of data from air-gas monitoring sensors during underground mining of gas-bearing coal seams for neural network analysis
Authors: Dvoryanchikov Mark , Pavlova Larisa , Weiss Inna
Published: December 2021

The paper describes the stages of primary study and preprocessing of data obtained from air-gas monitoring sensors for their further analysis using machine learning methods.
Development of 3D workspace and methodology for assessing operator’s functional state during the work in virtual environment
Authors: Nikitenko Mikhail , Kizilov Sergey , Tarasova Irina , Ignatova Alla , Natura Elena
Published: December 2021

The article presents the current results of a research project aimed at developing software and hardware solutions that optimize an operation of dispatch services based on immersive technologies. The results of the virtual operator’s office creation for the subsequent program-protocol communication of the displayed information with the data sources of the dispatching object are presented. The virtual workspace is implemented in the form of large-scale objects, textures, lighting, etc. “animated” in virtual reality glasses. The results of the initial approbation of the methodology for assessing the psychophysiological state of operators during virtualization of the working information space are also presented in framework of multistage studies of effects of virtual reality on the user.
Laboratory stand for definition the filtration properties of coal seams
Authors: Tailakov Oleg , Utkaev Evgeniy , Smyslov Alexey , Kolesnichenko Sergey
Published: December 2021

To define the filtration properties of rocks, various physicochemical methods are used, among which laboratory studies can be distinguished [1, 2]. Determination of permeability in laboratory conditions is the main physical and technical study of the filtration properties of rocks.
Electrotomography of the roof rocks in coal seams
Authors: Saltymakov Evgeny , Gerasimov Artem , Tayursky Mikhail
Published: December 2021

A comparative analysis of boundaries determined by the initial and integrated geoelectric section with the results of engineering-geological wells drilling and sampling has been performed. Taking into account the refined boundaries, electrical conductive properties and mining and geological information, geological and geophysical sections were built and the roof condition in the study area was determined.
Assessment of revegetation with waste coal on the reclaimed sites in the Kemerovo Region – Kuzbass
Authors: Semina Irina , Androkhanov Vladimir , Solovyev Sergey
Published: December 2021

The paper presents the results of research and assessment of the revegetation degree in reclaimed areas using coal preparation waste in the Kemerovo region – Kuzbass. Reclamation of disturbed lands was carried out by backfilling the worked-out pits of the former coal mine with coal preparation waste and forming a root layer on the leveled surface of the waste using materials of the fertile soil layer (FSL) and potentially fertile rocks (PFR). During the field survey of reclamation sites, it was found that when sowing perennial grasses (Bromopsis inermis, Medicago sativa, etc.) or planting trees and shrubs (Hippophae rhamnoides, Pinus sylvestris, etc.) on the formed root layer from the PFR and / or FSL, favorable conditions are created for the formation of the primary phytocenosis in the reclaimed areas. The studies also showed that in reclaimed areas using a fertile soil layer for the formation of a root layer, a gradual restoration of soil properties is recorded in the surface covered layers, which in some parameters are close to natural soils common in the adjacent territories.
8 Sydnone-Based Cycloadditions in Click Chemistry
Authors: Friscourt F.
Published: December 2021

The 1,3-dipolar cycloaddition of sydnones (1,2,3-oxadiazolium-5-olates) with dipolarophiles, such as alkynes, has recently emerged as a versatile click reaction, with applications ranging from the mild and regioselective preparation of polysubstituted pyrazoles for drug discovery to the metal-free bioorthogonal ligation of biomacromolecules in living cells. This chapter reviews the importance of metal catalysis for controlling the regioselectivity of the copper-mediated reaction (CuSAC), as well as the development of fluorogenic probes, the click and release strategy, and photo-triggered ligations based on strain-promoted sydnone–alkyne cycloadditions (SPSAC).
Influence of bulky substituents on single-molecule SERS sensitivity
Authors: Pszona Maria , Gawinkowski Sylwester , Jäger Regina , Kamińska Izabela , Waluk Jacek
Published: December 2021

The surface-enhanced Raman spectroscopy (SERS) detection limit strongly depends on the molecular structure, which we demonstrate for a family of tert-butyl-substituted porphycenes. Even though the investigated species present very similar photophysical properties, the ratio between the SERS signal and fluorescence background depends on the number of bulky tert-butyl groups. Moreover, the probability of single molecule detection systematically drops with the number of the moieties attached to the pyrrole ring. As steric hindrance is the only significantly changing feature among the studied chromophores, we attribute the observed phenomena to the spatial structure. We also show that the sensitivity of the SERS technique can be improved by lowering the temperature. We managed to observe single-molecule spectra for derivatives for which this was unattainable at room temperature.
Oral health surveillance in Australia: the need for ongoing data to inform public health decision-making
Authors: Chattopadhyay Amit , Christian Bradley , Gussy Mark , Masood Mohd , Hegde Shalika , Raichur Anil , Martin Rachel , Kenny Amanda
Published: December 2021

Surveillance of people’s health takes on an important meaning in the practice of public health because it allows monitoring of diseases and prompt response to change in proportions and rates at which diseases occur in populations. Improving health of populations requires establishment of an effective public health system. Population level data and analysis is critically important in government policy and program development and monitoring. Lack of or inadequate information about the health of populations leads to ineffective policies that may often attenuate health problems instead of solving them. Australia’s current oral health surveillance is mostly through ad hoc sentinel surveys, which lack recency in time. This position paper is to present the need for real-time oral health surveillance in Australia, which can be used to inform health decision-making in a timely manner.
Rapid assessment of perfect time for transferring wells to water injection for pressure maintenance in low-permeable sediments of Tyumen suite of LLC «RN-Uvatneftegas» oilfields
Authors: Shevchenko B S , Ziazev R R
Published: December 2021

A significant part of the initial geological reserves of LLC “RN-Uvatneftegas” oilfields are concentrated in deposits with abnormally low reservoir properties (porosity, permeability). The organization strategy of pressure maintenance of such oilfields significantly affect to the economic profitability of the reservoir development. One of the major tasks to achieve this goal is to determine the perfect time for application injection wells in oil production before forming the pressure maintenance system. Often, the solution to this issue turns out to be labor-intensive. In this regard, the analytical tool has been developed that allows rapidly assess the perfect time for transferring wells to water injection for pressure maintenance forming. The developed tool is based on a statistical analysis of the decline rate of horizontal wells fluid rates at the RN-Uvatneftegas oilfields. And also a comparative analysis of the results of the developed tool and other existing methods was carried out. The analysis showed that the developed tool is distinguished by its accuracy, simplicity and efficiency of work.
Coral diseases of mushroom coral (Fungiidae) in Pari Island, Kepulauan Seribu, Jakarta
Authors: Subhan B , Zamani N P , Rahmawati F , Arafat D , Bramandito A , Khairudi D , Santoso P , Royhan Q M , Madduppa H , Rizqydiani M
Published: December 2021

Coral disease is one of the causes of the decline in the condition of coral reef ecosystems. This study aims to measure coral health based on the abundance and prevalence of coral health categories. The research was conducted in the Pari Island Cluster, Seribu Islands at four stations. The Belt Transect method with 2 × 100 meters was used to calculate coral health and a 30 m Line Intercept Transect (LIT) with three replications to determine substrate cover. The condition of coral reefs can be categorized as moderate to good based on this percentage value. The study results found five genera from the Fungiidae, namely Fungia, Ctenactis, Herpolitha, Heliofungia, and Sandalolitha. The most commonly found genus is the genus Fungia. The health condition of Fungiidae corals in Pari Island is divided into two categories, namely 35% healthy and 65% unhealthy, consisting of changes in tissue color - white (coral bleaching), changes in tissue color - not white (yellow band disease), and compromised health (damage by sedimentation). Yellow band disease is only found in the genus ˆ and is not found in other genera.
Illuminating species diversity of nudibranch in Indonesian coral reef ecosystem using molecular identification
Authors: Dharmawan I G W D , Bengen D G , Setyobudiandi I , Subhan B , Verawati I , Sani L M I , Madduppa H
Published: December 2021

Nudibranch has high species diversity with complex morphological characters and is challenging to identify at the species level. The lack of knowledge about nudibranchs makes it difficult to identify conventionally using morphological characters. This study aims to identify nudibranchs at the species level using the DNA barcoding method from the mitochondrial cytochrome oxidase 1 (CO1) gen. The results of DNA barcoding using the Cytochrome Oxidase I (COI) gene showed 18 species of 51 samples analyzed. The phylogenetic tree reconstruction revealed 11 main clades belonging to 11 genera. The genetic distance between and within species clearly shows the difference between individuals. Interspecific genetic distance shows the lowest value between species was found between Chromodoris annae and Chromodoris magnifica is 0.075, and the largest genetic distance observed between species Glossodoris rufomarginata and Tritonidae sp is 0.354. This study shows molecular analysis can be used to identify nudibranch up to species level, which will be a source of information in knowing the distribution and the genetic distance.
Internal solitary waves propagation speed estimation in the northern-part of Lombok Strait observed by Sentinel-1 SAR and Himawari-8 images
Authors: Chonnaniyah  , Karang I W G A , Osawa T
Published: December 2021

Remotely sensed data, both Synthetic Aperture Radar (SAR) and optical sensors, significantly contribute to the study and understanding internal solitary wave (ISW) dynamics in the ocean. Pairs of SAR and optical sensors were analyzed to estimate the ISW propagation speed in the northern-part of Lombok Strait. ISW propagation speed estimation used an image from Sentinel-1 SAR and three image pairs of Himawari-8 on 29 October 2018 with a time difference of 409 minutes. Sentinel-1 wide-swath imagery (250 km x 400 km) from two adjacent scenes can provide information on multiple ISW packets evolution in the northern-part of Lombok Strait. ISW propagation speed estimation on Sentinel-1 SAR image using the simple estimation by measuring the interpacket distance and dividing by the semidiurnal tidal period. The high temporal resolution of the optical sensor from Himawari-8 can estimate the ISW propagation speed using two different approaches. ISW propagation speed estimation using the semidiurnal tidal period from Sentinel-1 and Himawari-8 showed almost similar values. Sentinel-1 estimation results are 2.69 m.s−1(Lombok Strait) and 1.30 m.s−1(northern-part area), Himawari-8 results are 2.52 m.s−1(Lombok Strait) and 1.27 m.s−1(northern-part area). ISW propagation speed variability in the northern-part of the Lombok Strait shown in this study.
Influence of river discharge on circulation and tidal process in the Java Sea, Indonesia
Authors: Ramadhan H , Nugroho D , Nurjaya I W , Atmadipoera A S
Published: December 2021

This study investigates the effect of river discharge in transport and tidal processes in the Java Sea using the Coastal and Regional Ocean Community (CROCO) hydrodynamic model. The model has 20 vertical layers and a horizontal resolution of 1/18 degrees. The oceanic and atmospheric forcing of this model is taken from the global Copernicus Marine Environment Monitoring Service (CMEMS) model and the fifth generation ECMWF atmospheric reanalysis (ERA5) hourly data. Daily Global Flood Awareness System (GloFAS) data has been successfully implemented as river flow data for this study. Two scenarios have been applied, namely, with and without river discharge. This study shows that the two scenarios and the satellite observational data agree in terms of water level with Root Mean Square Difference RMSD) about 4 cm, Sea Surface Temperature with RMSD about 0.29 °C, and Sea Surface Salinity with RMSD about 0.39 psu. The model was also validated using seven tide gauges and produced a good agreement. River discharge increase eastward transport in the eastern part of the Java Sea up to 0.1 Sv (1 Sv= 106 m3s−1). Both scenarios produce similar tidal amplitude and phase and agree well with previous studies and other tidal data sources.
Modeling small-pelagic fish biomass in the Indonesian seas: climate variability and climate change impacts
Authors: Koropitan A F , Nabil  , Osawa T
Published: December 2021

The present study uses the Community Earth System Model, version 1– Biogeochemistry [CESM1(BGC)] to examine the influence of climate variability and climate change on small pelagic fish biomass in the Indonesian seas. The fish biomass was calculated based on a fish production model according to primary production and energy transfer at the tropic level. The primary production data were obtained from results of CESM1(BGC) model from 1850 to 2015. Empirical orthogonal function (EOF) analysis of the calculated fish biomass identifies three regions in the Indonesian seas that are associated with coastal upwelling. These regions are located in (1) southern coast of Central Java Province until west-coast of West Sumatra Province, (2) southern coast of Central Java Province until the southern coast of Bali Province, and (3) Banda-Arafura Seas. Fish production variability in these regions exhibits semi-annual, annual, and IOD-ENSO related signals. Climate change impact for RCP 4.5 scenario produces ‘fish stock increase status’ in 2025 for the three regions, while the ‘fish stock current status’ will reoccur in 2050, except for the western part of Sumatra (part of region-1) which alters to ‘fish stock decrease status’.