bluuebunny/crossref_metadata_2025 huggingface dataset:
Flow electrochemistry: a safe tool for fluorine chemistry
Authors: Winterson Bethan , Rennigholtz Tim , Wirth Thomas
Published: June 2021

A scalable, efficient and safe electrochemical fluorination protocol is conferred. A broad range of iodine(iii) mediated transformations were performed in high yields without exposure to toxic HF.
Effect of collagen and EPS components on the viscoelasticity of Pseudomonas aeruginosa biofilms
Authors: Rahman Minhaz Ur , Fleming Derek F. , Sinha Indranil , Rumbaugh Kendra P. , Gordon Vernita D. , Christopher Gordon F.
Published: June 2021

Pseudomonas aeruginosa is an opportunistic pathogen that causes thousands of deaths every year in part due to its ability to form biofilms composed of bacteria embedded in a matrix of self-secreted extracellular polysaccharides (EPS), e-DNA, and proteins.
Self-assembly of millimeter-scale magnetic particles in suspension
Authors: Hafez Ahmed , Liu Qi , Santamarina J. Carlos
Published: June 2021

Two-component system successfully assembles complex 3D structures.
When photoluminescence, electroluminescence, and open-circuit voltage diverge – light soaking and halide segregation in perovskite solar cells
Authors: Ebadi Firouzeh , Yang Bowen , Kim YeonJu , Mohammadpour Raheleh , Taghavinia Nima , Hagfeldt Anders , Tress Wolfgang
Published: June 2021

Changes inVocfor the mixed halide composition are not correlated with the emergence of the low-gap phase, confirming that this phase is not the sole culprit for a low and unstableVoc.
Recent advances in 2D MXenes: preparation, intercalation and applications in flexible devices
Authors: Xu Jinxin , Peng Ting , Qin Xin , Zhang Qi , Liu Tianyi , Dai Wubin , Chen Bing , Yu Huangzhong , Shi Shengwei
Published: June 2021

The very recent development and progress of 2D MXenes are summarized from the preparation, intercalation and delamination to potential applications in flexible devices, indicating the future directions of 2D MXenes.
Transfer learning‐based surrogate‐assisted design optimisation of a five‐phase magnet‐shaping PMSM
Authors: Ma Yiming , Wang Jin , Xiao Yang , Zhou Libing , Kang Huilin
Published: June 2021

Multi‐phase permanent‐magnet synchronous machines (MPMSMs) with high reliability due to sufficient fault‐tolerant capability have considerable potential for transportation electrification applications. Here, an efficient surrogate‐assisted design optimisation method is proposed based on analytical model transfer learning for torque characteristic optimisation of a five‐phase magnet‐shaping PMSM. By employing transfer learning of the source domain analytical model data and the target domain finite element analysis (FEA) data in surrogate model training, the proposed method can achieve both high accuracy and high efficiency from the merits of FEA‐ and analytical‐based optimisations, respectively. The studied machine with five‐phases and harmonic injected surface‐mounted PMs to enable harmonic injection for torque capability improvement is introduced and the analytical model is built based on the segmented PM and the complex conformal mapping methods. Besides, the optimal Latin hypercube design (LHD) and Taguchi methods are used to form the source and target domain datasets, respectively, so that data features can be efficiently captured over a wide range of optimisation variables. An optimal design is obtained by multi‐objective optimisation using the trained surrogate model, which is prototyped and measured to validate the proposed method.
High‐frequency single‐switch PFC with frequency‐modulation controlled class‐E2 converter
Authors: Zhu Wenqi , Ikari Takayuki , Lovison Giorgio , Inoue Keisuke , Yamagami Shigeharu , Sekiya Hiroo
Published: June 2021

This paper presents a single‐switch zero‐voltage switching (ZVS) power‐factor correction converter based on the class‐E converter at 1 MHz switching frequency. A design method for ensuring the ZVS for the entire line‐voltage period is proposed. By visualising the ZVS region in the parameter space, circuit parameters can be easily obtained to achieve the ZVS for the entire line‐voltage period. Additionally, a closed‐loop controller is applied for achieving a high power factor, low total harmonic distortion of the input current and output voltage regulation. The experimental circuit achieved the ZVS in the entire line‐voltage period against load variations. As a result, the implemented converter achieved the same level of power‐conversion efficiency as the 100‐kHz power‐factor correction converters and a high power factor with low total harmonic distortion, which denoted the effectiveness of the proposed design method.
Dynamical analysis of clusters of galaxies from cosmological simulations
Authors: Aguirre Tagliaferro T. , Biviano A. , De Lucia G. , Munari E. , Garcia Lambas D.
Published: June 2021

Context. Studies of cluster mass and velocity anisotropy profiles are useful tests of dark matter models and of the assembly history of clusters of galaxies. These studies might be affected by unknown systematics caused by projection effects.

Aims. We aim to test observational methods for the determination of mass and velocity anisotropy profiles of clusters of galaxies. Particularly, we focus on the MAMPOSSt technique

Methods. We used results from two semi-analytic models of galaxy formation, coupled with high-resolution N-body cosmological simulations, the DLB07 catalog, and the FIRE catalog based on the new GAlaxy Evolution and Assembly model. We tested the reliability of the Jeans equation in recovering the true mass profile when full projected phase-space information is available. We examined the reliability of the MAMPOSSt method in estimating the true mass and velocity anisotropy profiles of the simulated halos when only projected phase-space information is available, as in observations.

Results. The spherical Jeans equation provides a reliable tool to determine cluster mass profiles, both when considering the whole population of cluster galaxies, and when considering subsamples of tracers separated by galaxy color; the exception to this is for the central region, where deviations may be attributed to dynamical friction effects or galaxy mergers. The results are equally good for prolate and oblate clusters. Using only projected phase-space information, MAMPOSSt provides estimates of the mass profile with a standard deviation of 35–69% and a negative bias of 7–17%, nearly independent of radius, which we attribute to the presence of interlopers in the projected samples. The bias changes sign; that is, the mass is over-estimated, for prolate clusters with their major axis aligned along the line of sight. The MAMPOSSt method measures the velocity anisotropy profiles accurately in the inner cluster regions and there is a slight overestimate in the outer regions for the whole sample of observationally identified cluster members, and, separately, for red and blue galaxies.
The New Generation Planetary Population Synthesis (NGPPS)
Authors: Burn R. , Schlecker M. , Mordasini C. , Emsenhuber A. , Alibert Y. , Henning T. , Klahr H. , Benz W.
Published: June 2021

Context.Previous theoretical works on planet formation around low-mass stars have often been limited to large planets and individual systems. As current surveys routinely detect planets down to terrestrial size in these systems, models have shifted toward a more holistic approach that reflects their diverse architectures.

Aims.Here, we investigate planet formation around low-mass stars and identify differences in the statistical distribution of modeled planets. We compare the synthetic planet populations to observed exoplanets and we discuss the identified trends.

Methods.We used the Generation III Bern global model of planet formation and evolution to calculate synthetic populations, while varying the central star from Solar-like stars to ultra-late M dwarfs. This model includes planetary migration,N-body interactions between embryos, accretion of planetesimals and gas, and the long-term contraction and loss of the gaseous atmospheres.

Results.We find that temperate, Earth-sized planets are most frequent around early M dwarfs (0.3M⊙–0.5M⊙) and that they are more rare for Solar-type stars and late M dwarfs. The planetary mass distribution does not linearly scale with the disk mass. The reason behind this is attributed to the emergence of giant planets forM⋆≥ 0.5M⊙, which leads to the ejection of smaller planets. Given a linear scaling of the disk mass with stellar mass, the formation of Earth-like planets is limited by the available amount of solids for ultra-late M dwarfs. ForM⋆≥ 0.3M⊙, however, there is sufficient mass in the majority of systems, leading to a similar amount of Exo-Earths going from M to G dwarfs. In contrast, the number of super-Earths and larger planets increases monotonically with stellar mass. We further identify a regime of disk parameters that reproduces observed M-dwarf systems such as TRAPPIST-1. However, giant planets around late M dwarfs, such as GJ 3512b, only form when type I migration is substantially reduced.

Conclusions.We are able to quantify the stellar mass dependence of multi-planet systems using global simulations of planet formation and evolution. The results fare well in comparison to current observational data and predict trends that can be tested with future observations.
Eight more low luminosity globular clusters in the Sagittarius dwarf galaxy
Authors: Minniti D. , Gómez M. , Alonso-García J. , Saito R. K. , Garro E. R.
Published: June 2021

Context. The Sagittarius (Sgr) dwarf galaxy is merging with the Milky Way, and the study of its globular clusters (GCs) is important to understand the history and outcome of this ongoing process.

Aims. Our main goal is to characterize the GC system of the Sgr dwarf galaxy. This task is hampered by high foreground stellar contamination, mostly from the Galactic bulge.

Methods. We performed a GC search specifically tailored to find new GC members within the main body of this dwarf galaxy using the combined data of the VISTA Variables in the Via Lactea Extended Survey near-infrared survey and the Gaia Early Data Release 3 optical database.

Results. We applied proper motion cuts to discard foreground bulge and disk stars, and we found a number of GC candidates in the main body of the Sgr dwarf galaxy. We selected the best GCs as those objects that have significant overdensities above the stellar background of the Sgr galaxy and that possess color-magnitude diagrams with well-defined red giant branches consistent with the distance and reddening of this galaxy.

Conclusions. We discover eight new GC members of the Sgr galaxy, which adds up to 29 total GCs known in this dwarf galaxy. This total number of GCs shows that the Sgr dwarf galaxy hosts a rather rich GC system. Most of the new GCs appear to be predominantly metal-rich and have low luminosity. In addition, we identify ten other GC candidates that are more uncertain and need more data for proper confirmation.
Problems of unconventional hydrocarbons sources on the example of the domanikites of the Timan-Pechora oil and gas province
Authors: Rostovshchikov V.B. , Kurta I.V. , Sbitneva Ya.S. , Kolokolova I. V.
Published: June 2021

The first industrial oil in the Timan-Pechora oil and gas province was obtained in 1929. By now more than 230 hydrocarbon deposits have been explored in the Province. A significant part of these deposits is under development. At the same time, the originally explored total resources have been developed in terms of oil only by 50%, in terms of gas - by about 30%. The remaining unexplored part of the initial total resources is forecast to be located in difficult unconventional bedding conditions, in particular, in the domaniсites of the Upper Devonian period. The so-called shale oil and gas are associated with them. The forecasting, exploration, and development of oil and gas deposits in the domaniсites require new methodological and technological solutions. The article discusses the problems of unconventional hydrocarbon development using the example of the domaniсites of the Timan-Pechora oil and gas Province.
Modeling and assessment of the stress-strain state of above-ground pipelines at different types of compensation sections
Authors: Besheryan Z.A. , Kantemirov I.F.
Published: June 2021

The development of Russian fuel and energy complex in the short term is connected with the development of new hydrocarbon field in the permafrost zone and the need to build Arctic pipelines north of the 60th parallel. The ground-based structural scheme of pipeline laying is the most optimal while constructing trunk pipelines in permafrost areas in the Arctic and subarctic latitudes. The actual operating conditions of these systems are insufficiently studied. The above-ground pipeline in permafrost is in an complex stress-strain state. This study presents the results of the assessment of the stress-strain state of linearly extended above-ground pipelines at different compensation sections (triangular compensator; trapezoidal compensator; U-shaped compensator) under actual operating conditions. Using the finite element method on mathematical models, the dependences of the transverse displacements of the pipeline on movable supports and stresses arising in dangerous sections of the typical pipeline section during self-compensation of deformations on the variable design parameters of the system for various load combinations were established (the simulation was carried out in the ANSYS software package).
Experimental studies of the efficiency of high-speed ESPs
Authors: Zhigarev D.B. , Lekomtsev A.V. , Gorlov A.E. , Dengaev A.V.
Published: June 2021

The purpose of the present research paper is to estimate the energy efficiency of ESP-operated low production rate wells (up to 100 m3/d).The data on pumps energy efficiency, including the high-speed ESPs, were consolidated and analyzed. The bench test of high-speed ESPs and comparison with field tests allowed to determine the efficiency adjustment factors and establish functional dependencies of energy parameters on shaft rotation speed;theobtainedcorrelations were suggested for recalculation of nominalvalues in bench tests. The paper also indicates that the average efficiency for the high speed ESPs is 12-17% higher in absolute values and 40-68% higher in relative values, compared with the efficiency of pumps with a nominal rotation speed of 3000 rpm. The suggested approach can be expanded as a methodology for wells with more complex operational conditions and more complex pump systems.
Nonstationary separation of Nd and Pr by P507 extractant
Authors: Dorozhko V.A. , Afonin M.A.
Published: June 2021

The low efficiency of the separation of rare earth metals by extraction on one stage requires the combination of a large number of mixer-settlers in a cascade. The problem of increasing the rare earth elements separation factor is extremely urgent. One of the perspective methods is the nonequilibrium nonstationary process. In this work, it is offered to use the principle of a nonstationary extraction in the separation process of the Nd/Pr pair from chloride medium by the extractant based onP507. The results which have been received by an experimental setup allowing the monitoring of the influence of a cyclic change of physical-chemical parameters on extraction in the online modeare discussed. A comparison of two ways of implementation of extraction in the nonstationary mode is carried out. The apparent values of physical-chemical parameters (ΔG, ΔH, ΔS) in the temperatures range 15-65 °C are calculated from the data of joint extraction of Nd and Pr.
Experimental and theoretical study of the flocculants mixing in water
Authors: Grigoryeva A. , S.Abiev Rufat
Published: June 2021

The article discusses the process of high molecular weight flocculant particles dissolving in water during mechanical stirring. A procedure of mixer selection taking into account mixer geometry based on the Prandtl’s semi-empirical turbulence model was developed and described. It was found that the choice of the optimal rotation speed is related with the turbulent frictional stress generated by the impeller of the mixer. The results of experimental studies on the preparation of concentrated solutions of high molecular weight cationic flocculant MagnaflokМ 155 using various impeller types are shown. The efficiency of a conical mixer has been confirmed, which makes it possible prepare a flocculant solution 1.3 times faster due to the possibility of mixing at higher rotational speeds with lower power consumption
The development of polyurea greases based on paraffin-naphthenic lubricating oil VHVI-4
Authors: Daudi D.I. , Kilyakova A.Y. , Kalyanova O.A. , Korotaev A.F. , Aleksanyan K.G.
Published: June 2021

The purpose of this work was to improve the tribological characteristics and low-temperature properties of polyurea greases, as well as to expand the operating temperatures of their use. In this work, as the dispersion medium were used base oils of groups I (I-20) and III (VHVI-4). Diurea was used as a thickener. The obtained samples of the lubricating greases were analyzed: penetration (GOST 32331-2013), drop-point temperature (GOST 32394-2013), colloidal stability (GOST 7142-74), tribological characteristics (GOST 9490-75), and effective viscosity at -50ºС (GOST 26581-85). Based on the analysis of the obtained data, it was concluded that the best properties have lubricants prepared on the group IIIbase oils. To improve the low-temperature properties, it was proposed to add a 50% ester (DOTF) to the dispersion medium of greases which have better performance.As a result of work done, we concluded that the polyurea greases improved their tribological characteristics and low-temperature properties after adding ether to VHVI-4 (1:1) as a dispersion medium.
Application of Newton’s method to solve optimization geodetic tasks
Authors: Bykasov D. A. , Zubov A. V. , Mustafin M. G.
Published: June 2021

The article provides general information on nonlinear methods of programming. The algorithm for determining the minimum of various target functions by Newton’s method of the second order is considered. The article presents the main advantages and disadvantages of the method. A circular approximation of the chimney measurement results is performed using Newton's method. The algorithm for solving these tasks was implemented in the Visual Basic for Applications software environment. The comparative analysis was held based on Newton’s method of the second order with the gradient methods for solving engineering and geodetic tasks. The data obtained allow considering the possibility of the further application of Newton’s method in geodesy, especially while solving nonlinear optimization problems. The development of modern technology allows to automate the computing process by writing specific software modules. This makes the process of calculating parameters convenient for the surveyor, as it relieves them from routine calculations.
Assessment of differential subsidence harmful effects on large bridge structures during the underground space development
Authors: Kireeva V.I. , Volokhov E.M. , Lebedev M.O.
Published: June 2021

The purpose of the study was to confirm the capability of numerical simulation of soils shift and bridge structures elements deformations during underground construction. The main goal of this simulation was to assess the harmful effects of mining operations on the existing bridge load-bearing elements. Modeling of bridge structures undermining by earth pressure balance tunneling boring machines (EPB TBMs) was carried out both at the design stage for predicting deformations and at the stage of underground work completion.
Characteristics of the method of creating innovative raw materials for the production of carbon fibers on the basis of coal from the Kuznetsk Basin
Authors: Vasilyeva Е.V. , Vetoshkina I.S. , Cherkasova Т.G. , Subbotin S.P. , Nevedrov А.V. , Papin A.V. , Solodov V.S.
Published: June 2021

Studies on thermal dissolution of G, GZh and Zh coals in anthracene oil were carried out in the laboratory of PAO Koks together with the Department of Solid Fuel Chemical Technology of the Institute of chemical and oil and gas technologies. The optimal parameters of the process were determined, and the quality of the obtained products was studied. The obtained indicators are compared with the quality indicators of raw materials required for the production of carbon fibers. It is shown that it is possible to obtain raw materials directly from coal, bypassing the high-temperature coking process, for the production of a binding material with the required properties.
Reflection of Social and Cultural Features in the Names of Stones and Minerals in Bazhov’s Tales
Authors: Stepanova L.I. , Shchukina D.A.
Published: June 2021

The aim of the articleis to study peculiarities of nominations of minerals in Russian and in its regional version, in the socio-lexicon of the Ural mining workers. For this purpose, a methodological procedure was developed based on the methods of corpus linguistics and an exemplary analysis of the semantic fieldmineral(minerals) in Russian was performed. The theoretical and methodological procedure is based on the semantic field theory,theory of divergence andthelexical approachproposed by Kevechs. As the material of the study were used the tales (skazy) of Pavel Bazhov .The tales (narrations) of Bazhov are a bright representation of the Ural folklore, regional perception of natural objects, their metaphorical reinterpretation , enrichment of semantic fields associated with the occupation of the inhabitants of the region, with additional semantic meanings. The results of the study reflect the presence of significant differences in the semantic structure of lexemes-nominations of minerals in the Russian language and its regional variant.
Selection of the optimal subsea production system using original software
Authors: Ivanova V.A. , Shabalov M.Y.
Published: June 2021

Due to the high relevance of the offshore oil and gas fields’ de-velopment, the authorsexaminethe technology of subsea mining, which is gaining popularity in the Russian Federation. The main types of subsea production system constructions were analyzed and a number of factors, which affect the development of offshore oil and gas fields, were proposed. An algorithm for the software product was created which allows after geo-logical exploration and the discovery of industrial oil and gas recourses to optimize the planning process and to save time and material costs for the company at the preliminary stages of planning. The software product algo-rithm based on such factors asdepth and size of the field, duration of ice season of the region, remoteness of the field from the coast, the level of development of transport infrastructure and the complexity of geological structure.
Near-field frequency attenuation of vibrations from blasting using a full-field solution
Authors: Gómez S. , Sanchidrián J.A. , Segarra P.
Published: June 2021

This study analyses the frequency content of vibrations from blasting in the near field using a vibration prediction model called full-field solution (FFS). For that purpose, the frequency content of recorded signals and synthetic waveforms obtained through the FFS using dominant and mean frequencies have been compared and correlated with the geometrical distance to the blastholes. The study shows that the model overestimates the dominant and mean frequencies in the entire frequency domain, which may require tailoring the source function to a lower frequency content. However, it attenuates the frequency content as distance increases. Additionally, the study shows that the mean frequencies may be used as a better estimator of the frequency content than the dominant frequencies.
GPR for mapping fractures for the extraction of facing granite from a quarry: A case study from Republic of Karelia
Authors: Isakova E.P. , Daniliev S.M. , Mingaleva T.A.
Published: June 2021

The main idea of the article is the problem of choosing the optimal complex of geophysical methods to study the coverage and localization of cavity in the rock massif. The necessity of using ground penetration radar (GPR) work on the facing stone deposits in the process of massif research has been identified and justified. Based on the study, the author proposed the use of two types of antennas with the aim of penetrating to different depths. The presented conclusions prove that using georadar for study of fracturing in a facing stone deposit could be effective.
Two-column two-filter water intake well and the method of its calculation
Authors: Ivashechkin V.V. , Medvedeva J.A. , Satsuta E.S.
Published: June 2021

Boreholes are the most versatile and technically advanced structural type of water intake structures. In this article, the authors propose the design of a water intake well with filters located at two levels, capable of simultaneously performing the functions of a working and reserve wells, the use of which will reduce energy consumption for lifting water, reduce capital investments for construction and ensure uninterrupted water supply. The methodology for calculating the inflow of water, constructing hydrodynamic grids, determining the function of lowering the pressure and filtering features during the operation of a two-level well in a confined aquifer is also presented.
Prevention of Oil Spills During Excavation Work Using Electromagnetic Sensors
Authors: Rybin A.S. , Fedorchuk Yu.M. , Nosova M.V. , Seredina V.P.
Published: June 2021

This paper presents an analysis of solution to the problems associated with mechanical damage to pipelines. A method of preventing accidental oil spills during excavation using electromagnetic sensors is proposed. The advantages of this method versus alternative options are described herein. A review of existing sensors and methods of their installation on the operating element of excavation equipment is presented. The optimal design solution ensuring accident-free excavation is developed. The economic effect of introducing this technology in the production processes of the oil and gas sector companies is shown.
Magnetic nanocomposite-system for the remediation of lead-contaminated urban surface
Authors: Maqbool Ahsan , Wang Hui , Saeed Muhammad , Hafeez Aimen
Published: June 2021

Lead pollution contributes 2% to environmental health and is found in air, dust, soil, and water. The presence of lead on the urban surface can put at risk human health and hinder sustainable urban development. The existing strategies are not feasible to remediate lead from the urban surface due to heavy infrastructure, long-term monitoring, and less space availability. Therefore, the magnetic nanocomposite-system is designed to remove lead from the urban surface regardless of contaminated sites within a short period of time and is immediately applicable. The magnetic nanocomposite is synthesized by hydrothermal treatment and has plenty of hydroxyl and carboxyl functional groups with mesoporous surfaces. The results showed that the leadremoval efficiency exceeded 97% even at a high concentration of 300 mg/L. pH has no significant effect on the removal efficiency. Also, it has shown stability and removal efficiency over 96% even after five reuse cycles. The proposed mechanism for the implication and separation of the magnetic nanocomposite system for the in-situ remediation approach has also highlighted the various applicable sites.
Revitalization of urban industrial areas based on sustainable development principles
Authors: Potseshkovskaya I.V. , Soroka A.N.
Published: June 2021

The article considers the formation of industrial territories in the structure of a historical city and the need to revitalize them in modern conditions on the basis of an integrated approach. Its goals and main objectives of revitalization are given. The problem of the industrial “belt” of the historical city, in particular, the “Grey Belt” of Saint Petersburg, and the potential of depressed former industrial areas in the structure of the city are shown. Examples of reconstruction and adaptation for the new functions of New Holland Island, the revitalization of a part of the territory of the Sevkabel Port plant into public space, and the Loft Etagi Project in the industrial zone in St. Petersburg are described.
Modeling of the torsion test of a cylindrical specimen with the help of the inverse method
Authors: Shishkin D.O. , Petrov P.A.
Published: June 2021

This article discusses the torsion problem of a continuous cylindrical specimen used to construct a hardening curve. A brief review of the methods for processing the results of the method of torsion of a cylindrical specimen is given. The possibility of using the inverse method to determine the material model in the case of the torsion of the continuous cylindrical specimen made of steel 20H is shown. By means of QFORM 9.0 software package virtual experiment connected with torsion of a cylindrical specimen is carried out. As a result of this research, the rheological model of steel 20His determined with a high degree of accuracy. The stress-strain state of the material was analyzed during the torsion of the specimen by means of the QFORM. The results of the virtual experiment are compared with the full-scale test.Anexceptionally good match of the results was obtained. The inverse method showed its efficiency and made it possibleto determine a rheological model of the material. The model accurately describes the experimental data. The resulting material model (for steel 20H) is valid in the following range of parameters: deformation temperature of 20°C, deformation rate of 0.5 s−1, the strain range of 0 to 2.5.
Study on the economic dispatch of regional integrated energy system based on master-slave game
Authors: Wang Yongli , Ma Yang , Ma Yuze , Yao Suhang , Tao Siyi , Shen Hekung , Chen Xin
Published: June 2021

Traditional demand response technologies optimize the load profile by cutting or shifting the electrical load, but they affect the customer’s energy experience, and thus the customer’s motivation to participate in demand response and load controllability are limited. For community integrated energy operators, the study of integrated customer demand response can explore their dispatch potential. Based on consumer psychology, we study the alternative energy use behavior of residential customers, establish a customer optimization model and a community integrated energy operator optimization model, and set up a Stackelberg master-slave game model with the operator as the leader and the customer as the follower. The simulation case verifies that the utilization of load-side multi-energy complementary characteristics and integrated demand response behavior can effectively improve the utilization of renewable energy and the efficiency of integrated energy operators.
Research on the structure of energy consumption pattern in typical Western China based on time series analysis
Authors: Kong Weizheng , Dai Hongcai , Wang Yaohua , Wu Xiaoyu , Chen Rui
Published: June 2021

Accelerating the transformation of the energy consumption pattern in western China and promoting the development of clean energy are the main problems facing the energy consumption system. This paper bases on the characteristics of China’s western region the industrial structure, the energy consumption structure, and analyses the energy consumption model transformation trend of typical of the west, on this basis, the combination of time series analysis and ARIMA model is used to set up different typical energy consumption in the field of forecast and analysis, and put forward according to the results of the analysis of energy consumption model transformation.
Analysis on the characteristics of energy mix in Myanmar
Authors: Xiangyang Lei , Youde Wu
Published: June 2021

Energy has been a key factor in economic development. Myanmar has considerable indigenous energy potential, which could meet domestic demand in long term if properly managed. This paper documents the current status of energy demand and supply in Myanmar, and analyses the characteristics of energy mix, and concludes that (1) Myanmar is confronted with a pressing energy demand with the rapid development of economy; (2) Myanmar’s energy production mix is dominated by oil, gas and hydropower, and the consumption structure is dominated by biomass; (3) the shortage of energy is mostly due to its unbalanced energy mix and irrational notion for energy utilization. In order to solve the serious problems between energy demand and supply, it is necessary for Myanmar to build more responsible hydropower projects, to optimize the national grid and to make more reliable and practicable energy plans.
Research on water environment and water saving management of swimming places
Authors: Yi Huang
Published: June 2021

The swimming gymnasium is a social public water industry with water as the carrier, which integrates fitness, education and entertainment. It is an important part of water saving work to strengthen the water environment and water saving management of swimming places because of its large water consumption, complex water users and relatively concentrated water consumption time. In recent years, with the rapid development of the national economy and the continuous improvement of people’s living standards, the demand and construction of swimming venues have rapid development, consuming a lot of water resources.
Leading the Construction of Economics and Management Laboratory in Colleges and Universities with the Concept of Green Development
Authors: Li Yun
Published: June 2021

Green development is the trend of the times. As an important carrier of practical teaching, economic and management laboratories in Colleges and universities should firmly establish the awareness of green development in laboratory construction, and put “green” into all aspects of laboratory construction. This paper discusses the problems of environmental pollution, equipment aging, low resource utilization rate, lack of awareness of green development and complex equipment maintenance in the construction of economics and management laboratories in colleges and universities, and discusses how to implement the green development strategy in the construction of economics and management laboratories, hoping to provide valuable reference for relevant personnel.
Ecological Risk Assessment of Typical Plateau Lakes
Authors: Yuyadong  , Yankun
Published: June 2021

Plateau lakes have significant ecological value. With economic development, lake pollution and ecological degradation have become increasingly prominent. There are many ecological risk assessment methods. This article combines four different ecological risk assessment methods including single-factor pollution index, geological accumulation index method, potential risk index method, and pollution load index method to analyze the heavy metal pollution in Yangzong seabed mud as comprehensively as possible. It shows that the results obtained by different ecological risk assessment methods are slightly different. The overall trends of the geological pollution index and the single-factor pollution index are similar. In terms of time, except for the two elements of mercury and cadmium, the contents of other heavy metals in 2019 are lower than in 2018, indicating that heavy metal pollution has decreased in 2019; from the perspective of spatial distribution, In 2018, the overall pollution level on the south side of Yangzonghai was higher than that in the central and northern regions of Yangzonghai . On the whole, whether it is the potential risk index or the appropriate pollution load index, the pollution level on the south side of Yangzonghai is higher than that in the central and northern areas of Yangzonghai, and the northern area has the least pollution.
Analysis of pressure relief and outburst prevention effect and mining depth effect of floor roadway in single serious outburst coal seam
Authors: Chen Guohong
Published: June 2021

In order to solve the serious problem of single serious outburst coal seam gas disaster, based on the gas geological conditions of Jiangxi Fengcheng Qujiang company, theoretical analysis, numerical simulation, field test and other comprehensive research methods were used to analyze the partition fracture law of roadway surrounding rock under different mining depth conditions. The results show that: under the conditions of high ground stress, high temperature and other environmental conditions, the radius of pressure relief loose circle of surrounding rock of roadway is significantly increased, and it is significantly larger than that of shallow part. In the deep area of - 800m elevation, the distance between floor roadway and coal seam is optimized to be 12 ~ 15m. The field test results show that the original permeability coefficient of overlying coal seam of floor roadway increases by 55.74 times, and the pressure relief effect is good.
Preparation of red elemental nanoselenium by Arabic gum template method
Authors: Guo Qingbing , Lin Xuegui , He Ming , Wu Guojie
Published: June 2021

Red elemental nanoselenium was prepared by reducing sodium selenite with ascorbic acid using Arabic resin as template in this study. The factors effecting on the particle size change of nanoselenium such as reaction time, reactant concentration, template mass fraction and reaction temperature were studied. The orthogonal experiment L9(34) was designed to determine the optimal process conditions. The elemental nanoselenium was characterized by IR and particle size analyzer. The results showed that the stable red elemental selenium with nanometer scale was prepared.
Preparation of silica antireflection film based on sol-gel method
Authors: Jiang Zheyu , Wan Qiuyi , Liu Jiarong , Tian Xiujun
Published: June 2021

Glass antireflection membrane can effectively increase the collection and utilization of sunlight by daylighting equipment, and has been widely used in solar energy related fields. Therefore, exploring the development of high-performance glass antireflection membrane is an essential topic in the current energy utilization research. This paper introduces the general situation of the preparation technology of antireflection membrane internationally, especially the specific method of producing antireflection membrane of silica by sol-gel method in the research. According to the analysis of the results, the significance of membrane surfactant which is similar to Triton X-100 was obtained, and the development prospect of this technology was discussed.
Research Analysis and Construction of Application of Deep Filtration Technology in Biopharmaceutical Process
Authors: Zhou Xin
Published: June 2021

This article analyzes the difference between deep filtration technology and surface filtration technology. The author studied the specific application of deep filtration technology in clarification of fermentation broth, pyrogen removal filtration, small molecule purification, product purification and separation, and purification of macromolecules. This article analyzes the common problems during the application of deep filtration technology. The author puts forward suggestions to improve the resource sharing mechanism, standardize the management of filtering research institutions, increase research on new technologies, and do a good job of comprehensive training of personnel. The purpose of this article is to deepen people’s understanding of deep filtration technology and promote the healthy economic development of the biopharmaceutical industry.
Uncertainty Measurement of Closed Flash Point of Organic Heat Carrier
Authors: Rong Yan , Guo Linyuan , Peng Yunyan , Yang Jianhua , Jin Dong
Published: June 2021

The closed flash point is an important indicator in the detection of organic heat carrier. In this paper, based on the Pensky-Martin flash point (closed) measurement method, the closed flash point of the organic heat carrier is measured with an automatic closed cup flash point meter. The factors that may affect the accuracy of the measurement result during the measurement process are analyzed, and the uncertainty is determined. Through the analysis of the established uncertainty component sources, the repeatability measurement of the organic heat carrier, the temperature sensor, the pressure sensor, and the numerical rounding based on the standard, the results of the closed flash point determination of the organic heat carrier are obtained. The synthetic uncertainty and the relative expanded uncertainty are evaluated to improve the reliability of the measurement results of the closed flash point of the organic heat carrier and provide a reference for the quality control of the organic heat carrier.
Soman hydrolysis catalysed by hypochlorite ions
Authors: Xu Mengxue , Zhang Hongpeng , Zhu Haiyan , Wang Lianyuan , Zhou Chaohua
Published: June 2021

Sarin (GB) and soman (GD) are severely toxic nerve agents that react slowly in water, resulting in long-term poisoning of the water and a serious threat to personnel. Some ions can catalyse GB and GD hydrolysis in water; the relevant research for GB is detailed, whereas that for GD is relatively less so. In this paper, GD hydrolysis catalysed by hypochlorite (ClO−) ions was studied via kinetic experiments. A fluorite-ion-specific electrode was used to monitor F− ions produced, allowing the rate constant and half-life of the GD hydrolysis to be calculated. The results showed that ClO− ions promote GD hydrolysis well; the higher the concentration of ClO−, the faster the GD was hydrolysed. In NaClO solution at pH 8.0 with 3.22×10–3 M ClO− ions, the half-life of GD hydrolysis was 82.5 s, about 875 times shorter than that in water at pH 8.0. The rate constant for catalysis of GD hydrolysis by ClO- ions ++(kc1o−)++ was 2.6 M−1 s−1, about one quarter the value of ++koh− ++but over 1500 times greater than kB and ++kPO4,++ with B representing N-2-hydroxyethylpiperazine-N’-2-ethanesulfonic acid present as a free base; this result indicated that ClO− ions catalyse GD hydrolysis well.
Ni2P/CoP loading on Porous carbon matrix for hydrogen evolution
Authors: Xu Yuelong , Liu Zhenfa
Published: June 2021

Due to high specific surface and plentiful of porosity, 3D porous carbon matrix has shown enormous potential for catalyst supporters. Hydrogen was thought as the next-generation clean energy to substitute the fossil fuel. Metal phosphides has been investigated and exhibited a good catalytic performance for hydrogen evolution reaction (HER). In this work, we prepared Ni2P/CoP loading on Porous carbon matrix through a facile method. The mixture of nickel nitrate, cobalt nitrate and chitosan was ball-milled, then was carbonized under N2 atmosphere at 900°C with NH4HPO2. The as-obtained materials were characterized by X-Ray diffraction (XRD), SEM and Raman spectrums. Also the electrochemical performance for HER was test using electrochemical workstation. The result shown that this catalysts presented a low overpotential at 10 mA cm-2, which was 270 mV.
Research Progress of MoS2Composite rGO Material in Gas Sensor
Authors: Huaning Jiang , Huaizhang Wang , Ting Liang
Published: June 2021

Since the successful preparation of single-layer graphene in 2004, two-dimensional materials have gradually become one of the research hotspots in the field of materials science. However, due to the inevitable defects of intrinsic two-dimensional materials, researchers began to explore how to obtain more excellent two-dimensional materials. In this paper, the basic properties, preparation methods and application in gas sensors of MoS2/rGO composites are reviewed. This paper has a certain reference value for the research of two-dimensional materials used in gas sensors.
Study of fluid flow inside closed cavities using computational numerical methods
Authors: JK Mariya Helen Mercy , V Prabhakar
Published: June 2021

The temperature distribution and distortion of fluid flow inside the closed cavities, square and triangle, are studied for different boundary conditions. Two different conditions of thermal boundary conditions are used for studying square cavities: (i) Left wall is hot, right wall is cold, top and bottom walls are adiabatic. (ii) Left and right walls are cold, top wall is adiabatic, bottom wall is hot. For triangular enclosure, the boundary conditions are (i) the vertical wall is insulated, bottom wall is hot. (ii) The vertical wall is hot, the bottom wall insulated and the inclined walls are kept cold in both conditions. The velocity of the flow is observed by means of stream function and the temperature distribution is displayed in the form of contours. The study is carried out in ANSYS software. The mathematical procedure for solving the nonlinear system of partial differential equations by penalty finite element method involving bi-quadratic elements is also discussed in detail.
State-of-the-Art-Bildgebung des Rektumkarzinoms
Authors: Schäfer Arnd-Oliver
Published: June 2021

Das Rektumkarzinom zählt zu den aggressiven Krebsarten, da es zur Ausbildung von Metastasen und Rezidiven neigt. Vor diesem Hintergrund entstand das Konzept der risikoadaptierten Patientenselektion zu multimodalen Therapien. Das Portfolio der Auswahlkriterien wird durch die differenzierte Analyse neuester Daten kontinuierlich angepasst, wobei die spezialisierte MRT als Gatekeeper im Zentrum der Therapieentscheidung steht.
Enhanced Recovery After Surgery Protocol in Emergency Laparotomy: A Randomized Control Study
Authors: Sharma Jyoti , Kumar Navin , Huda Farhanul , Payal Yashwant Singh
Published: June 2021

Introduction There is established evidence on the role of enhanced recovery after surgery (ERAS) protocols in elective surgeries but its effectiveness in emergency surgeries has been nominally studied. We aimed at studying the feasibility and effectiveness of ERAS protocols in patients undergoing emergency abdominal surgery for intestinal perforation and small bowel obstruction and compare their surgical outcomes with conventional care.

Materials and methods This prospective randomized study was performed for a period of 16 months. A total of 100 patients presenting either with intestinal perforation or acute small bowel obstruction were recruited; 50 each in the ERAS and the conventional care groups. The primary outcomes studied were the postoperative length of stay and 30-day morbidity and mortality.

Results It was seen that the median (interquartile range) of the duration of hospital stay in the ERAS group was 4 (1) days while it was 7 (3) days in the conventional care group, which was statistically significant (W = 323.000, p ≤ 0.001). Similarly, postoperative morbidities like a chest infection and surgical site infections) were significant in the conventional care group.

Conclusion The ERAS protocols are safe and effective in emergency surgeries and result in a better postoperative outcome.