bluuebunny/crossref_metadata_2025 huggingface dataset:
Lanthanide dodecyl sulfates, a potent family of catalysts for the preparation of biobased epoxy thermosets
Authors: Kazemi Forouzan , Schutz Louis , Bergeron Jean-Yves , Gagnon Eric , Yap Glenn , Claverie Jerome P.
Published: June 2021

Lanthanide dodecyl sulfates are highly active catalysts for the polymerization of epoxy monomers.
A pentanuclear {Co5} cluster motif forming a capped breathing kagomé lattice
Authors: Du Shaowu , Cui Meiyan , He Zhangzhen
Published: June 2021

A new pentanuclear cobalt–oxo cluster with a D3h oblate trigonal bipyramidal topology is extended into a triangle network, forming a unique capped breathing kagomé lattice.
Emergence of uniform tilt and π-stacking in triangular liquid crystalline honeycombs
Authors: Poppe Marco , Chen Changlong , Liu Feng , Poppe Silvio , Tschierske Carsten
Published: June 2021

Specifically designed oligo(p-phenylene ethynylene) rods form helical shells around triangular prismatic cells which fuse to a honeycomb with alternating helix sense; fluorination allows the control of tilt and π-stacking along the honeycomb.
The number and shape of lattice solvent molecules controls spin-crossover in an isomorphous series of crystalline solvate salts
Authors: Berdiell Izar Capel , Kulmaczewski Rafal , Shahid Namrah , Cespedes Oscar , Halcrow Malcolm A.
Published: June 2021

The hysteretic spin-transition in isomorphous [FeL2][ClO4]2·solv (solv = MeCN or EtCN) has the same midpoint temperature, but is split into two steps via a re-entrant intermediate phase in the EtCN solvate.
Two-dimensional stable and ultrathin cluster-based metal–organic layers for efficient electrocatalytic water oxidation
Authors: Yu Bin-Bin , Hua Yi-Wei , Huang Qi , Ye Si-Yuan , Zhang Hao-Dong , Yan Zheng , Li Rui-Wen , Wu Jun , Meng Yan , Cao Xuebo
Published: June 2021

The report describes the successful synthesis of CoNi bimetal two-dimensional CMOLs directly grown on Ni foam (Co0.6Ni0.4-CMOLs/NF), which shows excellent catalytic activity and stability for the OER under alkaline conditions.
Vacancy diffusion in palladium hydrides
Authors: Polfus Jonathan M. , Peters Thijs , Bredesen Rune , Løvvik Ole Martin
Published: June 2021

The diffusion coefficient of palladium varies with hydrogen content due to filling of antibonding states and softening of lattice modes.
Crystal transformation in Mn(ii) metal–organic frameworks based on a one-dimensional chain precursor
Authors: Jiang Yansong , Liu Rui , Gong Yiran , Fan Yong , Wang Li , Xu Jianing
Published: June 2021

The solvothermal reaction of Mn(ii) salts and 5-((4′-(tetrazol-5′′-yl)benzyl)oxy)isophthalic acid (H3L) affords an Mn(ii) based coordination polymer Mn(H2L)2(H2O)2 (1), which possesses a one-dimensional (1D) chain structure.
Correction: Up-scalable emerging energy conversion technologies enabled by 2D materials: from miniature power harvesters towards grid-connected energy systems
Authors: Rogdakis Konstantinos , Karakostas Nikolaos , Kymakis Emmanuel
Published: June 2021

Correction for ‘Up-scalable emerging energy conversion technologies enabled by 2D materials: from miniature power harvesters towards grid-connected energy systems’ by Konstantinos Rogdakis et al., Energy Environ. Sci., 2021, DOI: 10.1039/d0ee04013d.
Structural variation of protein–ligand complexes of the first bromodomain of BRD4
Authors: Guest Ellen E. , Pickett Stephen D. , Hirst Jonathan D.
Published: June 2021

The importance of the water network in BRD4-BD1 complexes is illustrated using molecular docking and absolute free energy perturbation simulations. 82% of the ligand poses were better predicted when including water molecules as part of the receptor.
The structure and biosynthesis of heinamides A1–A3 and B1–B5, antifungal members of the laxaphycin lipopeptide family
Authors: Heinilä Lassi Matti Petteri , Fewer David Peter , Jokela Jouni Kalevi , Wahlsten Matti , Ouyang Xiaodan , Permi Perttu , Jortikka Anna , Sivonen Kaarina
Published: June 2021

Laxaphycins are a family of cyclic lipopeptides with synergistic antifungal and antiproliferative activities.
Alkylation of the α-amino C–H bonds of anilines photocatalyzed by a DMEDA-Cu-benzophenone complex: reaction scope and mechanistic studies
Authors: Abadie Baptiste , Jonusauskas Gediminas , McClenaghan Nathan D. , Toullec Patrick Y. , Vincent Jean-Marc
Published: June 2021

The Cu(ii) complex 1 incorporating a BP chromophore is a highly active photocatalyst for the alkylation of α-amino C–H bonds of anilines. Mechanistic studies revealed the spectroscopic signatures of the key reaction intermediates.
Structure of plant photosystem I-plastocyanin complex reveals strong hydrophobic interactions
Authors: Caspy Ido , Fadeeva Mariia , Kuhlgert Sebastian , Borovikova-Sheinker Anna , Klaiman Daniel , Masrati Gal , Drepper Friedel , Ben-Tal Nir , Hippler Michael , Nelson Nathan
Published: June 2021

Photosystem I is defined as plastocyanin-ferredoxin oxidoreductase. Taking advantage of genetic engineering, kinetic analyses and cryo-EM, our data provide novel mechanistic insights into binding and electron transfer between PSI and Pc. Structural data at 2.74 Å resolution reveals strong hydrophobic interactions in the plant PSI–Pc ternary complex, leading to exclusion of water molecules from PsaA–PsaB/Pc interface once the PSI–Pc complex forms. Upon oxidation of Pc, a slight tilt of bound oxidized Pc allows water molecules to accommodate the space between Pc and PSI to drive Pc dissociation. Such a scenario is consistent with the six times larger dissociation constant of oxidized as compared with reduced Pc and mechanistically explains how this molecular machine optimized electron transfer for fast turnover.
CXCL2/10/12/14 are prognostic biomarkers and correlated with immune infiltration in hepatocellular carcinoma
Authors: Lin Tong , Zhang E , Mai Pei-pei , Zhang Ying-zhao , Chen Xiang , Peng Li-sheng
Published: June 2021

Background: C-x-C motif chemokine ligands (CXCLs) are critical regulators of cancer immunity and angiogenesis, which affect disease progression and treatment responses. The character of each CXCL in the prognosis and immune infiltration of hepatocellular carcinoma (HCC) patients is unclear yet. Methods: Differentially expressed CXCLs between HCC and normal control were screened by Oncomine and GEPIA2. Genetic alternations of CXCLs in HCC were analyzed by cBioPortal. Clinicopathological relevance of CXCLs in HCC patients was analyzed using UALCAN. The prognostic value of CXCLs was evaluated using univariate and multivariate analyses. Correlations of CXCLs’ expression with immune infiltration, chemokines and their receptors were assessed integrating TIMER, TISIDB, and GEPIA2. The co-expressed genes of CXCLs were discovered, and functional enrichment analysis was performed for them. Results:CXCL9/10 was significantly higher expressed while CXCL2/12/14 was lower expressed in HCC than normal tissues, but they didn’t show significant clinicopathological relevance in HCC patients. High-expression of CXCL2/10/12/14 indicated favorable outcomes of HCC patients. The expression of CXCL9/10/12/14 was significantly positively correlated with not only the infiltration and biomarkers’ expression of various tumor-infiltrating immune cells but also the abundance of chemokines and their receptors. The co-expressed genes of the five CXCLs were extracellular components and regulated immune or inflammatory responses and signaling pathways of chemokine, Toll-like receptor and tumor necrosis factor might be involved. Conclusion: The present study proposed CXCL2/10/12/14 might predict outcomes of HCC patients and were extensively related with the immune microenvironment in HCC. It would be a prospective therapeutic strategy for HCC to enhance effective immunity surveillance through intervening in these CXCLs.
Abundance–age relations with red clump stars in open clusters
Authors: Casamiquela L. , Soubiran C. , Jofré P. , Chiappini C. , Lagarde N. , Tarricq Y. , Carrera R. , Jordi C. , Balaguer-Núñez L. , Carbajo-Hijarrubia J. , Blanco-Cuaresma S.
Published: June 2021

Context. Precise chemical abundances coupled with reliable ages are key ingredients to understanding the chemical history of our Galaxy. Open clusters (OCs) are useful for this purpose because they provide ages with good precision.

Aims. The aim of this work is to investigate the relation between different chemical abundance ratios and age traced by red clump (RC) stars in OCs.

Methods. We analyzed a large sample of 209 reliable members in 47 OCs with available high-resolution spectroscopy. We applied a differential line-by-line analysis, performing a comprehensive chemical study of 25 chemical species. This sample is among the largest samples of OCs homogeneously characterized in terms of atmospheric parameters, detailed chemistry, and age.

Results. In our metallicity range (−0.2 < [M/H] < +0.2) we find that while most Fe-peak and α elements show a flat dependence on age, the s-process elements show a decreasing trend with increasing age with a remarkable knee at 1 Gyr. For Ba, Ce, Y, Mo, and Zr, we find a plateau at young ages (< 1 Gyr). We investigate the relations between all possible combinations among the computed chemical species and age. We find 19 combinations with significant slopes, including [Y/Mg] and [Y/Al]. The ratio [Ba/α] shows the most significant correlation.

Conclusions. We find that the [Y/Mg] relation found in the literature using solar twins is compatible with the one found here in the solar neighborhood. The age–abundance relations in clusters at large distances(d > 1 kpc) show larger scatter than those in clusters in the solar neighborhood, particularly in the outer disk. We conclude that, in addition to pure nucleosynthetic arguments, the complexity of the chemical space introduced by the Galactic dynamics must be taken into account in order to understand these relations, especially outside of the local bubble.
The dipper population of Taurus seen with K2
Authors: Roggero Noemi , Bouvier Jérôme , Rebull Luisa M. , Cody Ann Marie
Published: June 2021

Context. Dippers are typically low-mass, pre-main-sequence stars that display dips in their light curves. These dips have been attributed to dusty warps that form in the inner part of the disk.

Aims. Our goal is to derive the characteristics of dipper stars in Taurus to assess the physical mechanisms that induce dipper light curves.

Methods. We used the light curves of the fourth and thirteenth campaigns of K2 to select a dipper sample among 179 members and possible members of the Taurus star-forming region based on the light-curve morphology. We studied the periodicities by combining periodograms with wavelet analysis and derived the stellar parameters of the sample from the photometry. We also studied the morphology of the photometric dips.

Results. We find a dipper occurrence of ~30% in disk-bearing stars observed with K2 that were identified visually by us. This represents a lower limit to their true occurrence, on the one hand because they are ephemeral, and on the other because there are detection limits. About half of the dippers are aperiodic, and most of these are dominated by another type of variability. The chosen sample is of late spectral type (K/M), low mass (mostly <1 M⊙), and moderate mass accretion rates and has periods of a few days. We observed a transient dipper over a few rotation cycles and observed a dipper with a changing period. The structure of the dips can be complex and varies strongly over timescales of down to one stellar rotation. The corotation radii are located at a few stellar radii, and the temperatures at corotation allow dust survival. Many of the systems are seen at moderate to high inclination. We find that the angular extension of the dusty structure producing the dips is correlated with the stellar period.

Conclusions. Magnetospheric accretion, which causes an accretion column and its base to occult the star, can explain most of the observed light curves. Although compatible with the model, many of the stellar inclination angles are moderate and do not exclude mechanisms other than the occultation by an inner disk warp to account for dipper light curves.
Widespread occurrence of high-velocity upflows in solar active regions
Authors: Yardley S. L. , Brooks D. H. , Baker D.
Published: June 2021

Aims. We performed a systematic study of 12 active regions (ARs) with a broad range of areas, magnetic fluxes, and associated solar activity in order to determine whether there are upflows present at the AR boundaries and, if these upflows exist, whether there is a high-speed asymmetric blue wing component present in them.

Methods. To identify the presence and locations of the AR upflows, we derive relative Doppler velocity maps by fitting a Gaussian function to Hinode/EIS Fe XII 192.394 Å line profiles. To determine whether there is a high-speed asymmetric component present in the AR upflows, we fit a double Gaussian function to the Fe XII 192.394 Å mean spectrum that is computed in a region of interest situated in the AR upflows.

Results. Upflows are observed at both the eastern and western boundaries of all ARs in our sample, with average upflow velocities ranging between −5 and −26 km s−1. A blue wing asymmetry is present in every line profile. The intensity ratio between the minor high-speed asymmetric Gaussian component compared to the main component is relatively small for the majority of regions; however, in a minority of cases (8/30) the ratios are large and range between 20 and 56 %.

Conclusions. These results suggest that upflows and the high-speed asymmetric blue wing component are a common feature of all ARs.
Use of liquid-gas ejector in liquefied natural gas (LNG) sampling system
Authors: Martynenko Y.V. , Bolobov V.I. , Voronov V.A.
Published: June 2021

The article considers the modernization of the periodic sampling system of liquefied natural gas (LNG)by introducing a liquid-gas ejector (LGE) as an alternative to a gas compressor. The unique properties of liquefied natural gas allow the fuel energy to be directed to the ejector without any externalenergy input. Besides, the advantage of this method is that it prevents changes in the original chemical composition of the sample due to the liquid-gas ejector, which does not require lubricating oils. Also, the system reduces the volume of the regasified sample and eliminates the possibility of ejector failure.
Application of combined fracturing in carbonate reservoirs of an oil field
Authors: Ovsepian E.E. , Migunova S.V.
Published: June 2021

This scientific work presents the design of combined acid fracturing in carbonate reservoirs of an oil field using mathematical modeling methods. An analysis of geological and technical actions was carried out, on the basis of which it was revealed that the previously used acid fracturing showed high efficiency, but at the same time there was a rapid rate of decline in production. In this regard, after studying various types of fracturing, combined acid fracturing is recommended to apply. It was found that the application of this method helps to increase the width of fracture and keeps it open, thereby compensating the lack of traditional acid fracturing.
Modeling of unsteady flow around well with hydraulic fracture
Authors: Khisamov A.A. , Khabibullin I.L.
Published: June 2021

At present, hydraulic fracturing technologies are widely used for intensification of oil and gas recovery from reservoirs with hard-to-recover reserves. Modeling the processes of flow through porous reservoirs with hydraulic fractures has beenfairly completely developed in the steady-state flow approximation. Non-stationary processes of pressure distribution are considered as applied to the theory of hydrodynamic well survey methods, in which asymptotically limited intervals of coordinate and time variations are taken into account, i.e., distances of the order of the well radius and time significantly shorter than the characteristic time of the flow through the porous medium. At the same time, in reservoirs with hard-to-recover reserves (low-permeability reservoirs and high-viscosity oils), the duration of unsteady processes of pressure redistribution can be of the same order as the characteristic time of flow through the reservoir. This study presents new analytical solutions to the problem of the redistribution of non-stationary pressure in the vicinity of a well penetrated by a vertical fracture. The scientific novelty of the study lies in the fact that the model used takes into account, first, the fluid compressibility in the fracture and, secondly, the fluid flow not only through the fracture, but also through the porous reservoir. The solutions to the problems are constructed using the Laplace transform technique. In particular cases, the expressions known in literature follow from the solutions obtained. The analytical solutions obtained are analyzed, which makes it possible to determine the main characteristic features of the flow processes of around a porous medium.
Study on the effect of cetyltrimethylammonium bromide on gas-liquid flow characteristics at low gas flow rates and gas pressure
Authors: Yushkov A. Yu. , Ogai V. A. , Koroleva I.A. , Amro Moh'd M. , Rose Frederick , Kummer Nicolai-Alexeji
Published: June 2021

Cenomanian gas deposits account for about 80% of natural gas production in Russia. Today, mature Cenomanian gas fields are depleted by more than 75% on average, the reservoir pressure in the productive formation zone has decreased by almost 90% compared to the initial pressure and in some places reaches 1.0-1.5 MPa. Reduction of pressure in the pay zone leads to active intrusion of water from the aquifer. The liquid is loading the well, and gas production decreases. The technology of gas well operation with foaming agent is widespread in the world, which is characterized by a high level of efficiency, including economic. The use of technology leads to a solution to the liquid loading and requires a preliminary selection of the optimal concentration of surfactants. The optimal concentration should ensure the creation of a relatively stable foam and provide a minimum pressure gradient in the production tubing. The article presents the results of studies of CTAB foaming agent influence on the process of liquid removal and pressure gradient in production tubing. Sequential studies to determine CMC, foamability, foam stability, and pressure gradient under foam flow were conducted on small-scale and large-scale facilities. These results can be reliable when using CTAB foaming agent, foaming agents based on it, or other cationic foaming agents in Cenomanian gas wells under the condition of reservoir water inflow. Besides, the effect of pressure on the optimal concentration of the foaming agent was also studied in this work.
Optimization of distribution of emergency resources for emergency rescue points of oil and gas pipelines
Authors: Chen Y.Y. , Zhang L.B. , Hu J.Q. , Liu Z.Y.
Published: June 2021

According to the inherent characteristics of long-distance oil and gas pipelines, the optimization of emergency resources allocation can be implemented to maximize the utilization of pipeline emergency resources under a certain cost of emergency investment. We built an improved solution of a multiple knapsack problem in a greedy algorithm, proposed maximizing Emergency Resources Factor (ERF) as the greedy strategy, and established the optimization model of emergency resources allocation. This model innovatively combines factors such as the centrality of rescue points, the risk of pipe sections, and the necessity of emergency resources. The results show that, compared to a conventional resource allocation in a fixed proportion, an optimized allocation can reduce resource shortage and redundancy by 2.660% and 1.051%, respectively. Therefore, this model can be used to control the initialization of resource allocation in emergency rescue points of long-distance oil and gas pipelines.
Comparison of novel Ni doped exsolution perovskites as methane dry reforming catalysts
Authors: Lindenthal L. , Schrenk F. , Rameshan R. , Rameshan C. , Kronlachner L. , Nenning A.
Published: June 2021

Three perovskite-type materials with a different amount of B-site Ni doping have been tested for their catalytic performance during me-thane dry reforming (MDR) followed by characterization with X-ray dif-fraction (XRD) and scanning electron microscopy (SEM). They could be activated via a reductive treatment (either during a pre-reduction step or di-rectly in reducing reaction atmosphere), the main activating mechanism be-ing the formation of Ni nanoparticles on the surface by exsolution. The catalytic activity increased with the particle size and density. The particle distribution properties could be improved by increasing the amount of Ni doping from 3 % to 10 %, by using an A-site sub-stoichiometric perovskite and by choosing a higher annealing temperature during material prepara-tion. A deactivation over time was observed, due to segregation of CaCO3 on the surface, but no coking or particle sintering occurred
Methodology for assessing measures to reduce the technological risk caused by the effects of electromagnetic factor at the enterprises of the fuel and energy complex of Russia
Authors: Alimkhanova T.A. , Kovshov S.V.
Published: June 2021

The study includes assessment of working conditions of personnel, modeling of non-ionizing radiation distribution, methods and means of protection contributing to the effective organization of measures to protect workers. The study analyzes the actual parameters of electromagnetic safety at the facility for transportation and storage of natural gas; a mechanism is proposed for modeling the electromagnetic effect of the transformer on an adjacent work area; the option of minimizing the negative impact of the transformer by shielding is proposed; the effectiveness parameters of the developed shield are estimated.
Gentrification versus structure relocation – how can we preserve a city’s cultural heritage?
Authors: Połtowicz A. , Podhalański B.
Published: June 2021

A number of cities are currently experiencing gentrification at various stages and intensities. Gentrification is a powerful force for economic change, but it is often accompanied by unnecessary demolition of historic buildings that are not included in the monuments registers. This article describes how to identify an area that could potentially undergo or has already undergone gentrification, using the example of the Piasek district in Krakow. It explains how gentrification has intensified in this district since the 1990s. The article also discusses the possibilities of reducing the destructive impact of gentrification on urban space by relocation of a historical building that was initially slated for demolition due to the ongoing gentrification of the area.
A probabilistic and statistical model of rock deformation
Authors: Katanov Yu. E.
Published: June 2021

A new approach to the study of strength characteristics of the rocks on the basis of probabilistic and statistical models of the deformation processes (models of dilatancy initiation processes) under conditions of uncertainty is presented. The main purpose of the study is to create geological and mathematical tools, which could be used to study the development of volumetric deformation (dilatancy, disintegration) of reservoirs at a constant tension, acting on the array. The information and analytical basis of the performed study consists of methods of mathematical statistics and probability theory and the sedimentary rocks research methods. The probabilistic-statistical approach is formed in the study of deformation processes of the productive stratum structure, taking into account the degree of heterogeneity of the reservoirs. The obtained analytical expressions allow us to determine the moment of the beginning of the volumetric deformation process (dilatancy, disintegration) in the rock, similar to the identification of the bifurcation point in the development of geological and dynamic systems
Quality control of hardening technologies using the acoustic emission method
Authors: Grigoriev E.V. , Palaev A.G. , Golikov T.S. , Nosov V.V.
Published: June 2021

The ways of increasing the reliability and service life of industrial facilities are considered. The types of hardening technologies and methods of their control are analyzed. An approach that makes it possible to evaluate the quality of hardening technologies based on the registration of acoustic emission (AE) is described. The results of experimental research on the quality of three types of strengthening technologies are presented and the effectiveness of the proposed approach is shown. The obtained results can be used to assess hardening technologies at real facilities in a non-destructive way.
Improvement of Ural-20R borer miner loading augers
Authors: Sukhanov A.E. , Shishlyannikov D.I. , Kormshchikov D.S.
Published: June 2021

The paper analyses haulage equipment features of the Ural-20R borer miner. The process of loading ore with an auger is accompanied by circulation and grinding. This negatively affects the efficiency of mineral processing and causes increased dust formation and the need to use energy-intensive methods to reduce the concentration of dust in the bottomhole space. The authors of the work justify the rational geometric parameters of the design of the loading auger of the Ural-20R combine, which will reduce the circulation and crushing of ore during loading.
Hardware-software implementation of the compression and transmission of seismic data
Authors: Murtazina Leisan Sh. , Danilov Evgeniy V. , Ryabchenko Evgeniy Yu. , Sherstyukov Oleg N.
Published: June 2021

A real-time wireless network architecture for seismic data ac-quisition system based on multi-level radio network is proposed. The sin-gle-chip programmable transceiver Si446x that allows creating the first level of the network is considered. Physical layer with GFSK modulation in the sub-gigahertz band is considered. Data link layer implementation with generic frame structure for a network, operating in synchronous mode, is presented. An algorithm for seismic data accumulating and com-pressing is presented. The comparison of existing and proposed solutions is given.
Development of a filter amplifier of the signal pre-processing device for the passive listening mode of the hydroacoustic complex (НАС)
Authors: Hviyuzova D.A. , Belitskiy A.A.
Published: June 2021

The article describes the process of developing a filter amplifier, which is part of the signal pre-processing device. The requirements to the filter, which must be obtained at the output of the developed circuit diagram, have been established. It is described what the main elements of the circuit are responsible for and how they have been selected. It is shown that the developed device can find application in sonar technology.
Benefits and drawbacks of the national and foreign engineering education. Development trends
Authors: Voronova N.A. , Ostapenko M.S.
Published: June 2021

Modern education is a factor that determines the development of a person not only as a personality, but also as a well-qualified specialist. The change in the vector of development of state educational standards of higher education contributes to the reform of programs and methods of teaching students. The integration of the educational environment has led to the fact that most countries have adopted the Bologna system of education. It is thus losing the individuality of the educational process. This paper presents the differences between the national and foreign models of education, as well as the general requirements currently imposed on the quality of engineering education. The study was conducted based on a survey among students, teachers, and employees of enterprises. The aim was to determine the level of engineering education, the number of specialists, as well as personal and professional qualities of future employees of enterprises. The results of this research are based on respondents’ responses to an online questionnaire. The paper proposes the reconstruction of engineering education based on the scientistific research and the authors’ personal opinion, which contributed to the internationalization of science and the creation of international departments, increased mobility, language training, as well as the creation of conditions for non-standard tasks and team-work. The possibility of training students in real projects, which will promote the relationship between universities and enterprises, as well as facilitate the adaptation of students in the workplace in the future, was considered.
Three great books about power. Actual analysis of concepts
Authors: Zdretsov I.M. , Vasilyeva M.A.
Published: June 2021

In this article, three books related to power were analyzed: Kitami Masao’s “The Swordless Samurai”, Han Feitzu’s “The Book of Law and Order” and N. Machiavelli’s “The Prince”. The main judgments were highlighted and conclusions were drawn on how each author understands the power. Similar and opposite conclusions were compared. Also, the reasons for the fundamental differences between these ideas are identified. Analysis of differences on a religious basis was made using the modern Agamben's work “The Kingdom and the Glory” as it touches on the relationship between religion and power. The study used an integrated cultural-philosophical approach, in which descriptive method, comparative analysis, and synthesis can be separated from each other. As a result of this work, the following conclusions were obtained: the difference in the functions of power leads to different understanding of power; the religious environment surrounding a person largely influences his understanding of power. Based on this, different concepts of power should be compared to identify common significant positions that demonstrate the nature of power relations.
Contract modeling of investment projects in the field of oil and gas construction
Authors: Altemirova A.S. , Burenina I.V.
Published: June 2021

The purpose of this article is to select and justify the optimal contract model for one of the largest investment and construction projects of PJSC based on a preliminary assessment of the project under several alternative contracts. To achieve this goal, the following results were obtained: first, a classification of contracts for investment and construction projects (ICP) was developed, adapted to the specifics of the oil and gas business, second, the process steps for planning the contract model of oil and gas construction projects were formed, and third, a conclusion was made about the feasibility of using a particular contract model in terms of the project economy, its timing, the quality of decisions at each stage, and the risk management system.
Impact of oil prices on profitability and investment activity of oil companies from central and eastern europe
Authors: Ilic A. , Ponomarenko T.
Published: June 2021

In this text, we analyze the profitability and investments trends of oil companies from Central and Eastern Europe (CEE1)over the period 2008-2019. Based on descriptive statistics, comparative analysis, and panel data analysis, we show that: (1) CEE oil companies increased profitability in the period 2008-2019; (2) in the second sub-period (2015-2019), when the oil price was lower, ROACE of CEE oil companies exceeded ROACE of global major oil and gas companies; (3) in the second sub-period investment activity continued to be relatively high; and (4) oil price had less influenceon profitability and investment activities of CEE oil companies in comparison to oil majors. It is also showed that the upstream segment is less important for CEE oil companies than for major oil companies and the contribution of upstream segment to profitability of the companies was reduced during the period of lower oil prices.
Rating of resource-oriented countries based on aggregated sustainable development indexes
Authors: Khinkiladze V. , Nevskaya M.A.
Published: June 2021

Today, there is an acute problem of ensuring the universal well-being of humanity, based on the principles of sustainability. This problem is especially urgent for countries with a resource-oriented economy. This study considers the possibility of using adequate methods and indicators for assessing sustainable development, as well as building a ranking based on the data obtained, in countries with different levels of economic development and various human, natural, financial and material resources that determine the possibilities and lines of development for a dedicated group of resource-oriented economies. As a result of this study, it was revealed that today there is no single method capable of assessing the level of sustainable development of a particular country, the very indicators of certain raw material countries are difficult to compare sue to their subjectivity and, in their turn, require unification for more accurate analysis.
A theoretical framework for economic assessment of small-scale LNG projects
Authors: Tsvetkov Pavel
Published: June 2021

The production of small-scale liquefied natural gas (SLNG) is a promising area of the gas industry, which allows to solve the problem of energy carriers distribution between end users. This differs SLNG from medium- and large-scale projects that concentrate LNG in hubs. The implementation of SLNG projects assumes the creation of an extensive network that allows covering vast territories that are not covered by centralized gas supply networks, rather than the development of single production capacities. In this paper, we propose a theoretical framework that allows to assess the attractiveness of SLNG networks development not only in terms of direct, but also indirect effects, which differ depending on the composition of project stakeholders, as well as on the stage of technological chain. The essence of term “flexibility” in relation to LNG projects has also been clarified.
Influence of leaching parameters on the vanadium extraction from petroleum coke
Authors: Kudinova A.A. , Kondrasheva N.K. , Rudko V.A.
Published: June 2021

More than 60 trace elements, including rare metals, can be found in heavy oils. The most valuable component of oils and petroleum products is vanadium. It is used as an alloying agent to create extra strong steel, as a cathode for lithium-ion batteries, and also as a catalyst in the chemical industry. Nowadays studies of various methods for extracting vanadium from heavy oils and petroleum products are actively carried out. This work presents the method of alkaline and acid leaching of vanadium from petroleum coke and also results of the examination of influence of factors such as the duration of the process (0.5, 1.5 and 2.5 h) and the ratio of solid and liquid phases (1:2, 1:3 and 1:4). The highest yield of vanadium 80% is observed using sulfuric acid with the process duration is 1.5 hours and the ratio S/L = 1:4
Ensuring environmental safety of the Baltic Sea basin
Authors: Smirnova E.E. , Tokareva L.D.
Published: June 2021

The Baltic Sea is not only important for transport, but for a long time it has been supplying people with seafood. In 1998, the Government of the Russian Federation adopted Decree N 1202 “On approval of the 1992 Convention on the Protection of the Marine Environment of the Baltic Sea Region”, according to which Russia approved the Helsinki Convention and its obligations. However, the threat of eutrophication has become urgent for the Baltic Sea basin and Northwest region due to the increased concentration of phosphorus and nitrogen in wastewater. This article studies the methods of dephosphation of wastewater using industrial waste.
Cybersecurity in complex operations: a post-drilling approach foroil and gas wells
Authors: Perdomo R.A. , Serdyuk N.I.
Published: June 2021

Many companies are now workingto converge business models and engineering processes with the technologies of the fourth industrial revolution. The automation of industrial processes together with the implementationof infrastructure,makes it possible to interconnect people and performance indicators in real-time, reducing the decision-making time and time in themarketplace. This provides companies with unprecedented opportunities to create and capture value while rethinking business models but brings vulnerabilities and risks that must be properly assessed and mitigated. New malicious third parties are emerging and directly threaten the efforts of companies. The purpose of this article is to enumerate the possible attackers (vectors) and to define the possible areas where they can attack companies (surfaces), illustratingwith the example of drilling operations in the oil and gas industry, in order to provide discussion points about what new competencies technicians need to developto face these emerging threats.
Industry-energy system management by a Copula-based stochastic programming approach
Authors: Zhu Ying , Wei Zhao , Li Yexin , Luo Jingqi , Ge Bizhou
Published: June 2021

In this study, a Copula-based stochastic industry-energy system management (CSIE) model was developed based on Copula-based stochastic programming and interval linear programming. CSIE model can not only deal with extreme random events in industry-energy system (IES) of resource-dependent cities, but also quantify the risks of industrial energy demand-supply. To prove the practicability, a case study of IES planning in Yulin city was represented. Reasonable solutions of energy production and industrial energy consumption strategy were obtained, which can guarantee that pollutant emission meets the environmental requirements, and the system cost gets the lowest during 2021-2035. Furthermore, CSIE model could be spread to IES management in similar resource-dependent cities.
Quantitative evaluation of the nexus between water and energy in China
Authors: He Guohua , Li Xiaoling , Jiang Shan , Zhu Yongnan , He Fan , Li Haihong
Published: June 2021

This paper takes each province and region as the research object and 2017 as the research period, and the energy consumption of China’s social water cycle process was analyzed. The results showed that the total power consumption of China’s social water cycle process was 1082.81 billion kWh, accounting for 17.2% of the total power consumption of China’s society in 2017. Terminal water consumption is the biggest energy consumption. Based on the calculated results, this study puts forward relevant suggestions for realizing energy-water coordinated security.
Evaluation and spatial aggregation of ecological water use in each region of the Yellow River Basin
Authors: Huiliang Wang , Hui Li , Danyang Di , Dengmin Yan
Published: June 2021

Ecological water is the basic condition to maintain river health in a water-deficient basin. The evaluation and spatial distribution of ecological water are significance to the allocation of water resources under the concept of ecological civilization. In this paper, the connotation and composition of value of ecological water are defined from the perspective of ecosystem material circulation. Based on the emergy theory, the quantitative methods of different types of ecological water value are proposed. Combined with the spatial autocorrelation analysis method, the analysis method of spatial distribution and aggregation characteristics of watershed ecological water value is established. We took the Yellow River Basin as an example, and estimated and analysed its ecological water value and the spatial distribution characteristics according to the 9 regions of basin. The results showed that: In the Yellow River Basin, the single water value of the ecological water in the river channel is 17.45-24.36 yuan, the single water value of the sediment transport water is 2.42-7.28 yuan, and the single water value of the ecological water outside the river channel is 10.87-16.61 yuan. Ecological water value presents obvious difference in the space. Both outside and inside the river course, the high concentration areas of ecological water value are in the middle and lower reaches, while the low concentration areas are in the lower reaches, which indicates that we should consolidate the ecological water value in the middle and lower reaches and enhance the water value in the upper reaches. The research results have guiding significance for the allocation of ecological water in each province and region.
Parameter identification and state-of-charge prediction of decommissioned lithium batteries
Authors: Shi Qian , Li Junkai , Qin Qi , Zhang Chijian
Published: June 2021

Aiming at the problem that different temperatures and working modes affect the parameter identification and state of charge (SOC) estimation of decommissioned lithium batteries, a new method based on the second-order RC equivalent circuit model combined with the recursive least square method (RLS) is proposed to introduce the forgetting factor, and combined with the extended Kalman filter algorithm (EKF) to realize the method of online parameter identification of decommissioned lithium batteries and the optimal estimation of SOC. In order to solve the problem of obtaining the optimal solution of the error covariance matrix and the measurement noise covariance matrix in EKF, the particle swarm optimization algorithm (PSO) is used to optimize online to further improve the SOC prediction accuracy. The results show that the joint optimization algorithm can accurately identify the parameters and SOC values of retired lithium batteries, which is helpful to realize the echelon utilization of retired lithium batteries.
Analysis and application of prediction model for formation fluid sampling time while drilling
Authors: Chen Zhongshuai , Ni Hongjian , Jiang Chuanlong , Zhang Yang , Zhang Hui
Published: June 2021

Formation sampling while drilling (FSWD) is one of the most advanced formation sampling techniques in the world. It is characterized by short operation time, shallow mud invasion, and the obtained formation data is closer to the real situation of the reservoir. During the sampling process, the first fluid that the suction probe on the borehole wall inhales is basically drilling mud filtrate. With the increase of suction time, it gradually mixes into the formation fluid, and finally the formation fluid is infinitely close to 100%. At this time, it is very important to judge the starting time of sampling. If the sampling time is too early, the percentage of samples contaminated by drilling filtrate will be higher, which can not meet the requirement of fidelity. If the sampling time is too late, the drilling fluid will stop circulating for too long, which will cause sticking. In this paper, the prediction method of sampling time is to simulate the permeability of drilling fluid to formation under certain formation parameters and drilling conditions. Based on the simulated permeability results, the suction model of sampling tool is established to simulate the pumping situation, and the variation of the content of drilling filtrate in the pumped fluid with the suction time is obtained, that is, the relationship between the contamination rate of formation fluid and the suction time, This method is of great significance to the field application of fluid sampling tools while drilling.
Ecological management technology for coarse sediment area in the Yellow River Basin
Authors: Shen Zhenzhou , Li Binbin , Deqiang Han , Hong Zhang , Cheng Shiping , Hou Liting , Li Cao , Yideng Chang
Published: June 2021

Across wide range of research survey of the Pisha stone area landform, erosion and vegetation characteristics, on the basis of conducting the Pisha stone under different conditions of underlying surface erosion characteristics of the test, at the same time the wide range of investigation, access, summarizes the local government and the management experience and management pattern of the masses, summarizes the research of Yulin Pisha stone areas covered sand erosion governance approach and the prevention and control technology.
The Evolutionary Game Model of Local Government Environmental Regulation with Media Participation
Authors: Song Minxue , Wang Tianhua
Published: June 2021

The battle for pollution prevention and control has been promoted in an all-round way, and the quality of the ecological environment has been significantly improved, but the results are not stable, and environmental problems are still prominent. With the development of social economy, media supervision is playing an increasingly important role in government actions and environmental issues. This paper considers the role of media supervision, constructs an evolutionary game model between local governments and enterprises, analyzes and explains the evolutionary equilibrium. The results show that the media exposure of corporate pollution and local government inaction is conducive to achieve evolutionary equilibrium {regulation, cleaner production}. Local governments give enterprises pollution control subsidies and environmental protection rewards, which can promote green and clean production of enterprises. The paper provides a useful reference for promoting clean production of enterprises and achieving high-quality development.
Study on Predication of Air-conditioning Energy Consumption in University Teaching Buildings
Authors: Qiao Chunzhen , Yang Tingrui , Jia Chunxia
Published: June 2021

In this paper, the summer air conditioning cooling load of a university teaching building in Beijing is analyzed by orthogonal experiment and DeST energy consumption simulation method, and the primary and secondary relationship and significance level of the factors affecting cooling load are obtained, which can provide energy-saving design Focus. At the same time, through regression analysis of the test results, the summer cooling load prediction equation of the teaching building is obtained, and the error analysis of the equation is performed to verify the linear correlation of the equation. The prediction equation can be used to quickly and simply evaluate and analyze the effects of different design strategies on teaching the influence of building summer cooling load.
Scheme design and economic analysis of an office building’s cold and heat source system in hot-summer and cold-winter zone
Authors: Jiang Xiangting , Lv Yaojun , Jin Hongwen , Yan Haoran , Qiu Yang , Hou Qingying
Published: June 2021

In the context of green development and sustainable development, in response to the national policy of “carbon neutrality and peak carbon dioxide emissions”, we will fully implement clean energy heating and reduce air pollution. Air energy is the representative, bringing the comfortable, efficient, safe and energy-saving environment to people. For an office building in Nanjing, which is located in hot-summer and cold-winter zone, an air source heat pump unit is designed as a cold and heat source system to meet the demand for heating in winter and cooling in summer. At the same time, compared with the traditional cold and heat source system which is designed central heating in winter and multi-line refrigeration in summer, the result of economic analysis shows that the use of air source heat pump as the cold and heat source system of office buildings is more economical and energy-saving. It is suitable to popularize and apply in China’s hot-summer and cold-winter zone.
Route Optimization Method of UAV Autonomous Transmission Line Detection Based on Beidou Positioning Service
Authors: Cui Wenjun , Wang Tao , Cai Lifeng , Zhang Yanhua , Zhang Jiaxin
Published: June 2021

By using Beidou high-precision positioning technology, drone autonomous flight technology, and drone communication technology, a drone inspection system has been constructed. In order to further improve the work efficiency of UAV inspection on transmission lines, a single-base tower UAV inspection track optimization method based on the filtering method of the sphere unit limit is proposed. With the assistance of precision positioning services, the autonomous drone inspection hovering accuracy can reach an average of 5cm (E-W), 6cm (N-S), and 7cm (H), which meets the requirements of fine line inspections. The method proposed in this paper can further improve the efficiency of UAV fine independent inspection while improving the intelligent level of transmission line inspection.