bluuebunny/crossref_metadata_2025 huggingface dataset:
Planning pipeline pigging operations with predictive maintenance
Authors: Sousa A. M. , Pereira M. J. , Matos H. A.
Published: June 2021

Deposition of waxes, asphaltenes, scales or hydrates is one of the most challenging operational problems in the oil and gas industry, both during production and transportation. Direct inspection procedures, such as employing a closed-circuit television system, allow visual assessment of the blockage, yet discretely in time and, consequently, of low value for the purpose of ensuring production over time. Therefore, an indirect predictive maintenance method for systematic evaluation of the internal pipe section is herein developed, adding a much needed solution to the current body of knowledge. Using continuous field measurements, it is now possible to predict when pigging should be performed to avoid significant blockages. Moreover, evaluating the maintenance plan risk is another major achievement. Finally, the proposed methodology and model were applied to a real case-study yielding good results compared to the current scheduled maintenance approaches.
Performance of a novel green scale inhibitor
Authors: Mahmoodi Leila , Malayeri M. Reza , Tabrizi Farshad Farshchi
Published: June 2021

Many aspects of oilfield scale inhibition with green scale inhibi-tors (SIs) have remained untouched. For instance, the discharge of large amounts of produced water containing various types of hazardous chemi-cals, such as SIs into the environment has become a major concern. In-stead, environmental regulators encourage operators to look for greener SIs. In this study, the performance of a green SI was investigated using PHREEQC simulation. For a specific case study, two brines are considered to mix incompatibly to estimate the critical mixing ratio that has the high-est tendency to scaling. Subsequently, for 50/50 mixing ratio as the critical value, theoptimal dosage of SI and its performance in the presence of two different rocks were investigated such that 450 mg/L SI would be consi-dered as optimal value. Moreover, the simulated results show that more SI adsorption on calcite would be predicted, compared to dolomite.
Description of the stability of residual marine fuel using ternary phase diagrams and SARA analysis
Authors: Smyshlyaeva K.I. , Kondrasheva N.K. , Rudko V.A.
Published: June 2021

The results of the analysis of the properties of components of residual marine fuels (RMF) are described. The stability areas of marine fuels are determined using ternary phase diagrams VisRes - ULSD – LGOCC, Asphalt – ULSD – LCGO, Asphalt – ULSD – LGODC. The graphic method for determining the stability of A.B. Stankiewicz based on SARA analysis is used to describe the stability of RMF on the basis of VisRes - ULSD – LGOCC. The areas of stability, instability, and metastability of marine fuel are presented on the graph according to the Stankiewicz method, which can be used to predict the stability of RMF.
Water vapor adsorption/desorption on granulated binder-free low-module zeolites
Authors: Borisova T.N. , Gordina N.E. , Prokof’ev V.Yu. , Afanas’eva E.E. , Afineevskii A.V.
Published: June 2021

A characteristic of granulated LTA and SOD zeolites is given. It was determined that LTA zeolite particles have a cube shape with a size of ~2 μm; SOD particles have an irregular shape with a size of 0.5–1 μm. The dimension of the coherent scattering region was calculated to be 760 nm for LTA and 453 nm for SOD. The specific surface area of LTA is 115 m2·g–1 and SOD is 141 m2·g–1. Static tests of granulated zeolite showed that the maximum quantity of absorbed water vapor for LTA was ~30 wt.%, and for SOD ~20 wt.%. It was found LTA zeolite to provide adsorption of water from the gas to a dew point of –50 °C, and SOD zeolite of –9 °C. The apparent activation energies for the desorption of water on zeolites were calculated using isoconversional analysis of Friedman, Ozawa–Flynn–Wall, and Kissinger–Akahira–Sunose.
Use of tailings in mn dissolution from marine nodule matrix
Authors: Herrera N. , Toro N.
Published: June 2021

The nodules are spherical bodies that are scattered within the sedimentary zone of the seabed, and their growth is closely associated with the biogeochemical processes and water sediments. These nodules are mainly composed of Mn, Fe, SiO2, Ca, Ni, Cu, Co and Al. Manganese nodules are an excellent source of base metals and sought-after and rare elements and the fact that they are used as a base elements matrix will be in high demand in industry. Previous studies have shown that primary con-centrations of chemical such as Fe in the system are beneficial for increas-ing manganese extraction. However, it is necessary to optimize the opera-tional parameters so as to maximise Mn recovery. This work investigates the effect of using of tailings, obtained after slag flotation ata foundry plant on the dissolution of Mn from marine nodules, where statistical analysis was distributed using factorial experimental design ontime, MnO2/Fe2O3 ratio, and H2SO4 concentration.
On the recycling and use of microsilica in the oil industry
Authors: Glazev M. , Bazhin V.
Published: June 2021

Cementing of casing strings is one of the most important processes of well construction for the exploration and exploitation of oil, gas and gas condensate fields. Despite more than half a century of research and development of grouting mortars, they are not able to provide high strength and good adhesion to the casing string. The article considers the possibility of using microsilica (waste of silicon production) in the oil industry, as an additive of a plugging solution to increase the strength, expansion valve, and reduce the permeability of the plugging stone.
Difficulties in the industrial introduction of new effective hydrodesulfurization catalysts in the Russian Federation
Authors: Konoplin R.R. , Kondrasheva N.K.
Published: June 2021

The article presents bibliographic knowledgeof the world-scaleinventions that formed the basis ofHDS-catalysts for the development of variousoil products. Extensive studies were conductedon optimizationof carrier properties, active-phase chemical-mass composition, and basictech-nological parameters of transformation of initial components into active six-sided MoS2 groups which are decorated by CoS2 molecules, involving stages of desulfurization ofoxide formsof the catalyst. Differences in the microstructure of Al2O3supportsderived from aluminum hydroxide of vari-ous genesis are described. Comparative possibilitiesof binding properties of aluminum hydroxide raw materials in laboratory tests and molding of-waterpeptidized pastesare presented.
Comparative Analysis of the Russian and Australian Legislation on Toxic Gases after Blasting
Authors: Medova E.A. , Rudakov M. L.
Published: June 2021

The article provides an analysis of Russian and Australian national documentation on occupational safety and industrial safety for toxic post-blast gases. The main purpose of the article is to present the results of research on the need for a recognized document that would be appropriate for the all countries conducting open cut blasting. The research was performed with two spheres of mine safety in mind, such as occupational health and safety to establish standards for environmental exposure to harmful gases and an industrial safety to establish the sequence of blasting operations to prevent the spread of post-blast gases. In addition, a brief description of the key parameters to be included in the documentation is included.
Numerical simulation of vertical shaft sinking using artificial ground freezing
Authors: Zhelnin M.S. , Kostina A.A. , Plekhov O.A. , Levin L.Y.
Published: June 2021

Artificial ground freezing (AGF) is used worldwide for vertical shaft sinking in difficult hydrogeological conditions. The modern tendency is to determine the design parameters of the freezing technique based on numerical simulation. This work is devoted to the numerical simulation of the formation of an ice-soil wall in the soil stratum due to the AGF and shaft sinking under the protection of the wall. For this purpose, a fully coupled thermo-hydro-mechanical model of soil freezing has been developed on the basis of the theory of poromechanics. The developed model considers important features of the freezing process, such as the phase change, pore water migration due to cryogenic suction, frost heave, and consolidation of the soil. The results have shown that the model allows to predict the distribution of ice content, assess stress and strain in the ice-soil wall, and estimate displacement of the excavation wall.
Problems of the organization of surface and underground space (e.g. historical embankments of Saint Petersburg)
Authors: Shapiro S.L. , Kopkov M.P. , Potseshkovskaya I.V.
Published: June 2021

The article explores modern approaches to urban environment improvement, reconstruction ofSt. Petersburg embankments in the historic center, management of the pedestrian environment and public spaces. The concept of creating multifunctional underground and subaqueous thruways close to the historical development of St. Petersburg has maximum potential. The article gives several of embankment spaces from domestic and foreign experience and analyzes some transport problems. The projects of different years are studied. A new urban planning concept for the solving problem of separation of traffic and pedestrian traffic, aimed at the development of public space near water is proposed
Building GIS data & sustainable master plan for Haddatha village
Authors: Bdeir Soha , Abboud Mohammad
Published: June 2021

Places are built and expand as society grows. Nowadays, it is essential to use a sustainable approach to the use of natural resources. Presently, the whole world must create a digital model, archive data, and build villages and cities using digital information. Accordingly, the objective of this project is to build geodatabase and create a master plan for Haddatha. Haddatha is a village on the border with southern Lebanon, which to this day suffers from a lack of proper urban planning. GIS and sustainable master plan were built for this village to identify information about roads, land plots, zoning, and planning.
Study of the effect of positioning accuracy of system rigidity and part quality in waterjet cutting
Authors: Nozirzoda Sh. S. , Bukhanchenko S. E.
Published: June 2021

This paper discusses ensuring the specified accuracy and quality of processing parts of various shapes by scientifically validatedchoiceof the processing zone, cutting modes, and making adjustments to the control systems of the technological system for waterjet cutting. In the course of experimental studies, the stiffness of the positioning system for the installation of awaterjet cutting tool, the accuracyand quality of processing with waterjet cutting were determined. The influenceof the stiffness of the positioning system of the abra-sive waterjet cuttingtool on the accuracyand quality of the surface of the ob-tained products and the ways to improve accuracy were determined. Based on the results of the study, recommendations to improve the accuracy and quality of partsare given.
Development of methods for determining the relative weight of physical factors in pipeline paraffinization
Authors: Kopteva A.V. , Ushkova T.O.
Published: June 2021

The paper is devoted to the development of a system for predicting pipeline paraffinisation, which is a matter of urgency in oil transportation to ensure resource-saving and facilitating sustainable development of the oil industry. The paper focuses on the composition analysis of measuring instruments, the combined use of which can fix the values of all physical parameters right at the time of paraffin formation. To date, the need for such measurements is due to the absence of a precise model for the process of formation of paraffin deposits and correlating dependencies between the process of paraffinisation and physical factors causing it, as well as the absence of possibility to create a forecasting system without this information. Its creation has become possible as a result of introducing advanced methods for measuring the degree of pipeline paraffinisation and oil stream viscosity, critical for the aforesaid data collection. The paper discusses the process of pipeline paraffinisation, presents the selected methods for measuring the desired values, as well as describes the required measuring equipment. The developed system of sensors is characterized by the absence of contact with the medium being measured, full automation, and minimum number of elements. Economically feasible stages of the system development and implementation were selected.
System of forming control signals by correction devices with creation of neural network patterns based on matrix analysis
Authors: Manin A. V. , Vayner D. B.
Published: June 2021

The compensating devices are controlled in the structure of the automatic control system in conjunction with the sensors included in a particular node of the power grid. But the overall state of the local power grid for the reactive power flow is not considered. It is proposed to generate control signals to correction devices by processing the information obtained by monitoring from remote sensors of voltage and current of the distribution grid. It is possible to use the matrix method of forming the control signals to correction devices to adjust the grid parameters. To improve the energy efficiency of correction devices in the monitoring structure, it is proposed to use static reactive power compensators (SVCs) based on magneto-valve elements. The proposed distribution grid monitoring structure with the transfer of information over a local area network from sensors to correction devices makes it possible to stabilize the required grid parameters among consumers and minimize the loss of electrical energy from reactive power flow.
Substantiation of development system parameters taking into account the main dimensions of working equipment used in the development of mineral deposits by open-pit method
Authors: Tyukov P.O. , Loginov E.V.
Published: June 2021

The text substantiates the dependence of the complex dimen-sions of and transportation equipment (excavator - dump truck links) on the parameters of the mining method, which ensures an increase in the effi-ciency of open-pit mining of mineral deposits, is justified in the text. In-creasing the efficiency of open-pit mining method using a complex of ex-traction and loading and transportation equipment is achieved by increasing the range of permissible parameters of the mining method. The study allowed to identify

the dimensions of the extraction and loading and transportation equipment complex (excavator - dump truck links) affect the height of the bench and the width of the working platform

the dimensions of the mining and loading equipment (excavator - dump truck links) are the main indicators that affect the parameters of the mining method at the complex of mining and loading and transportation equipment.
Socialization of a person at the stage of entering university
Authors: Morgunov V.V. , Novikova E.S.
Published: June 2021

The purpose of this study is to analyze the main factors of socialization that affect a person at the stage of admission to a higher education institution. The study is based on a 2020 survey of students of St. Petersburg Mining University. The paper analyzes such factors as family influence, academic performance, changes in the circle of friends, and new conditions. As a result, each of the studied factors was characterized, as well as the phenomenon of value conflict and the possibility to consider high academic performance at university as an indicator of successful socialization were noted.
Mining damage management system with a stakeholder communication component
Authors: Styk Katarzyna , Bogacz Paweł
Published: June 2021

The paper presents an original algorithmfor a mining damage management system with a stakeholder communication component.The paper addresses the issue of communication with stakeholders of mining companies, more specifically, with local stakeholders (hosts) who face the problem of damage caused by the mining activities of companies. Efficient and effective communication in case of occurrence and reporting of damages is extremely important for the image and quality of relations with local communities. However, there is an apparent problem in the industry with the speed and efficiency of processing claims. The authors of the paper propose a procedural model to improve this process. The algorithm is based on the Servqual methodology, with parallel accounting,according to the project management triangle, of the elements of scope, finance, time, and quality. The algorithm is fully functional and comprehensive. Not only does it guide through the next steps, indicating times and personal responsibility, but it also includes draft input and output documents. It provides an effective guide for the conduct of each notification, describing the course of actions and indicating the necessary actions to be taken.
Public perception of carbon capture (utilization) and storage projects: world experience and the situation in Russia
Authors: Simonchuk V D , Romasheva N V
Published: June 2021

At present, one of the major global environmental problems is the greenhouse effect, which is caused by carbon dioxide emissions. One of the most innovative methods to combat the greenhouse effect is the introduction of CC(U)S projects, involving the implementation of CC(U)S technologies, aimed to carbon capture (CC), storage in underground facilities (S), and sometimes utilization (U). This paperexamines foreign experience of applying CC(U)Stechnologies, which have shownthat some projects have been canceled due to negative public reaction because of low awareness. To understand the prospects for the implementation of CC(U)S projects in Russia, student surveys were conducted among St. Petersburg universities in order to determine the level of awareness of Russian society about this issue. As a result, recommendations were developed to increase awareness level of society of CC(U)S technologies The study is based on publications of Russian and international experts in different scientificjournals. The research methodology includes desk studies, methods of comparative analysis and systematization, a sociological study, a method of generalization, and grouping.
Application of neural network technology to calculate well logging porosity on the example of UK2-7 formations in the Yelizarovsky deflection (Western Siberia)
Authors: Lisovskaya E.A. , Platov B.V.
Published: June 2021

The article describes the use of an artificial neural network to calculate porosity in the West Siberian oil and gas province for the UK2–7 strata. The estimated porosity was compared with core porosity data. Correlation coefficient between core samples porosity and well logging porosity (using the neural network) showed higher values in comparison with traditional methods of porosity estimation.
Integrated reservoir characterization based on a comprehensive study of the geological structure using 3D seismic survey
Authors: Zhumabekov A.K. , Portnov V.S. , Zhen L.
Published: June 2021

The 3D seismic survey is the undisputed leader among tools of identifying potential exploration targets and reservoir characterization. This paper shows surveys that are crucial in the exploration and development of significant amounts of hydrocarbon resources, and enables operator companies to map complex geological structures and select better drilling locations. The purpose of the research is to have better understandings of formations and update previous studies in the oil field of Mangyshlak Basin, Western Kazakhstan. The Main results are the acoustic impedance, Vp/Vs ratio, lithological and reservoir properties data. The quality controls and analysis of results show a good match with well logs and good recovery of seismic signal in inversion, but it should be improved in some areas. The results, from a scientific point of view, expand the already known geological and geophysical studies of the reservoir and improve the quality of interpretation using seismic methods in studying the sedimentation environment.
Nodule bacteria in the remediation of soil contaminated by drilling waste
Authors: Zimnukhov M.A. , Zimnukhova A.E. , Rusakovich A.O. , Beliavskaia O.Sh.
Published: June 2021

The paper studies the possible application of salt-tolerant strains of nodule bacteria such as 340b, 348a, 1360, 367a, 363a, 375a for clover and lupine in bioremediation of the soil contaminated by drilling waste in the Tyumen Region. Chemical composition of drilling sludge at the Nivagal’skoe oil field in KMAO (cluster No 924) was determined using XRF analysis, eight types of salinization wereidentified: MgSO4, Na2SO4, NaCl, NaHCO3, Na2CO3, sulfate-soda, sulfhate-chloride, and gypsum. Laboratory studies on nodule bacteria survival were carried out. Inhibiting influence of most salinization types was found, however, all samples have shown positive survival. Moreover, increaseof essential nutrients in the soil was noted. These results indicate that the application of given strains in the remediation of soil contaminated by drilling waste- is possible.
Ensuring information security in corporate communication systems
Authors: Matrokhina K.V. , Makhovikov A.B. , Trofimets E.N.
Published: June 2021

The paper considers a secure information transfer protocol for corporate IP-telephony system. In the article are analized the advantages and disadvantages of the known protocols. A description of the process of establishing a connection, sending text messages and voice communication in the developed protocol is given. Its practical significance and expediency of use are described.
Groundwater Level Prediction based on Neural Networks: A case study in Linze, Northwestern China
Authors: Zhang Hui , Zhao Jixuan , Chen Chong
Published: June 2021

Groundwater level is an important factor in evaluating groundwater resources. Due to numerous non-linear factors, establishing theoretical models is difficult.. Therefore, this paper proposesthe BP (Back Propagation) neural network and the Radial Basis Function (RBF) neural network. The study area is divided into two zones. The R2 (coefficient of determination) and RMSE (Root Mean Squared Error) are used to evaluate the performance. The BP neural network is used to predict groundwater level in the two zones with the R2of0.57 and 0.54, with the RMSE of 0.0804 meters and 0.1864 meters respectively. The RBF neural network is implemented with R2of 0.65 and 0.61, with RMSE of 0.0720 meters and 0.1519 meters, respectively. The results show the RBF neural network performs better than the BP neural network in the accuracy of predicting groundwater level. This study shows the feasibility and superiority of groundwater simulation using neural network.
Integrated energy system planning research based on big data load prediction method
Authors: Wang Yongli , Shen Hekun , Yang Jialin , Wang Nan , Ma Yuze , Zhao Pengxiang , Li Zhen , Zhou Xichao , Yao Suhang
Published: June 2021

The planning of integrated energy system is a very complex multi-target, multi-constraint, nonlinear, random uncertainty mixed integrated combination optimization problem, its planning and design process should not only consider the interdependence between the system capacity, energy conversion, energy storage, energy use and other links, but also consider the interaction and integration of cold, hot, electricity and other multi-energy flows, which is essentially a non-deterministic polynomial difficult problem. China’s energy continues to develop rapidly, all kinds of sensors and intelligent equipment data is increasing, the data obtained in the equipment and all kinds of sensors collected energy load prediction related factors such as temperature, weather, wind speed and other data volume increased dramatically, the data dimension is also increasing, the scale of data has also increased from GB to TB or even higher, based on the traditional prediction methods and intelligent prediction methods, has been far below the load forecast desired to achieve accuracy and speed requirements, Therefore, the use of big data technology to predict energy demand is an important future direction.
Analysis of energy saving in domestic ceramic industry kilns
Authors: Yin Wen , Wang Kaifang
Published: June 2021

Ceramic industrial kiln refers to the combustion equipment for ceramic production, which generally refers to roller kiln, shuttle tunnel kiln and shuttle kiln. Roller kiln refers to the kiln with continuous firing and rotating roller as the vehicle of the billet body; Tunnel kiln refers to the kiln which adopts continuous firing and takes rail kiln car as the transport vehicle of billet body. Shuttle kiln refers to the kiln which is fired intermittently and consists of kiln car, kiln chamber and kiln door. Factors influencing energy saving of kiln include construction materials, kiln structure, combustion technology, thermal insulation performance and automation control.
Analysis of hidden safety hazards and treatment suggestions when the floating roof of oil storage tanks falls to the bottom
Authors: Yang Jiahao , Zhou Fan , Wu Weixing , Zhang Jun , Chen Shaoqiang , Zhu Genmin
Published: June 2021

In the actual production and operation of enterprises, it is sometimes inevitable that the floating roof will fall to the bottom. This paper calculates the explosion limit of the mixture of oil gas under the floating roof, and confirms that the concentration of oil gas will be within the explosion limit under certain circumstances. Through the monitoring and analysis of the oil-gas mixing space below the floating roof, corresponding control measures are proposed to deal with the potential safety hazards of the floating plate falling to the bottom.
Investigation of data mining technique and artificial intelligence algorithm in microflora bioinformatics
Authors: Li Huixing , Xue Yan , Zeng Xiancai
Published: June 2021

Bioinformatics has gradually received widespread attention and has shown the characteristics of a large amount of calculation and high complexity. Therefore, it is required to adopt computer algorithms in bioinformatics to improve the efficiency of bioinformatics processing problems. Big data and artificial intelligence technologies have the characteristics of supporting bioinformatics and have achieved certain results in the field of bioinformatics. Introduced the application basis of big data and artificial intelligence in bioinformatics, analyzed data collection, preprocessing, data storage and management, data analysis, and mining technology. Furthermore, typical applications in bioinformatics are discussed in terms of gene expression data analysis, genome sequence information analysis, biological sequence difference and similarity analysis, genetic data analysis, and protein structure and function prediction. Finally, the bottlenecks and challenges in the application of big data and artificial intelligence in bioinformatics are discussed, and the application prospects of related technologies in bioinformatics have prospected.
Energy consumption analysis of a ground water-source heat pump for the plant factory based on TRNSYS simulation
Authors: Yang Gukun , Shi Huixian , Xu DeTian , Shen Zheng , Zhang Zhonghua , Shen Haowen , Wang Zijing
Published: June 2021

The ground water-source heat pump system for the plant factory lacks a scientific operation strategy to solve the problem of high energy consumption in winter and summer. It is very difficult and uneconomical to change the operation conditions by experimental means to obtain actual operation data. The current study aims to build a TRNSYS simulation model of the ground water-source heat pump system of Shanghai Chongming Natural Light Plant Factory. For the heating season, the simulation of energy consumption was 2315 GJ. Compared with the actual energy consumption, the relative error is -0.98%, which indicates that the simulation results are accurate and the simulation model developed is appropriate and usable. Numerical simulations for the whole year on this basis yielded that the plant factory energy supply system operates from November to March with a heating energy consumption of 3530.84 GJ and from June to September with a cooling energy consumption of 1126.24 GJ. In most cases, the indoor temperature fluctuates within a reasonable range, but in the summer high-temperature season, the plant factory temperature will reach above 40℃, which seriously affects plant growth. After optimization, the plant factory stops production in July and August, and the system stops running, the results are that the optimized system can save 56% of the annual cooling energy consumption, totalling 767.48 GJ, which can reduce the costs by 160,318.05 RMB.
Green technology innovation, media attention and enterprise performance
Authors: Liu Mingming , Zhang Hongjie
Published: June 2021

This paper selects domestic A-share listed companies from 2010 to 2019 as the research sample, and makes an empirical analysis on the impact mechanism of green technology innovation and enterprise performance, as well as the intermediary role of media attention. It is found that green technology innovation has a significant promoting effect on enterprise performance, and green technology innovation also has a significant promoting effect on media attention, which plays a significant intermediary role between green technology innovation and enterprise performance.
Application of Matter Element Analysis in Power Grid Development Diagnosis
Authors: Xu Chao , Huang Di , Chen Zhe , Peng Dong , Zhao Lang , Zhang Tianqi
Published: June 2021

The structure and form of modern power grids are becoming more and more complex, and there are many indicators and factors that need to be considered to evaluate the development status of the power grid. In order to diagnose the development level of power grid, the index system is reconstructed, which includes seven dimensions: the coordination of power grid development speed, the coordination of power grid development scale, the coordination of power grid structure, the security and reliability of power grid, the level of equipment, the utilization efficiency of power grid and the development benefit of power grid, the construction principle and index selection basis are given. When dealing with contradictory problems in reality, methods combining quantitative and qualitative can be applied to study. The matter element analysis method is applied to power grid development diagnosis, and a model of power grid development diagnosis based on matter element analysis is established, the model can not only diagnose the development level of power grid, but also determine the key factors that affect the diagnosis results, and give suggestions for improvement. The practical example verifies the feasibility and rationality of the method, which has good evaluation accuracy and prediction effect.
Research on explosion suppression technology of low-concentration gas transmission pipeline
Authors: Wu Weizheng
Published: June 2021

In order to effectively control the explosion accident disasters of low-concentration gas transmission pipelines and improve the safety of low-concentration gas transmission and utilization process, the paper has summarized and analyzed the current three types of low-concentration gas transmission pipeline explosion suppression technologies and devices used in the field, including powder suppression, inert gas suppression and fine water mist suppression, and put forward the problems of coal mine gas transmission pipeline explosion suppression technologies. It is of great practical significance to pipeline transmission and utilization of low-concentration gas.
Design of digital regulated power supply based on feedback control
Authors: Zeng Haixia , Huang Yi , Chen Yan
Published: June 2021

This paper studies and designs a multi-functional digital regulated power supply, which can realize the switch between the two functions of numerical control current source and numerical control voltage source, and can set the relevant current parameters and voltage parameters through the keyboard. The idea of feedback control is fully adopted to establish the internal and external double negative feedback structures, so as to improve the precision of the regulated power supply. The digital regulator has the advantages of convenient control, large amount of display data, stable performance and so on. It is suitable for various applications of small capacity power supply.
Study on the impact of coastal land use change on environment based on remote sensing data
Authors: Yong Liu , Chen Yunlin
Published: June 2021

The coastal zone is the bridge between the ocean and the mainland, the junction of the two ecosystems, the focus of the economic development of coastal cities and the gathering place of ports. Remote sensing technology uses the detector to receive the electromagnetic wave from the target object. After processing the information, it can distinguish the attributes of the target object. It is widely used in marine development, aerospace understanding, resource exploration and other fields.In this paper, the coastal zone of Shangyu Economic Development Zone on the south coast of Hangzhou Bay is taken as the research area. Using multi-source remote sensing data, information extraction, change monitoring and analysis are carried out from the perspective of marine and land ecosystems, and the impact of coastal development on the coastal zone is discussed. The main conclusions are as follows:

(a) Using visual interpretation method, it is found that the coastline of the study area changes obviously, and the decrease trend is below the total coastline length; Fractal dimension index is used to characterize the natural condition of coastline. The total coastline length, natural coastline and artificial coastline all increase, which means that the amount of beach sediment deposition and the degree of artificial intervention have increased in this stage.

(b) The object-oriented method is used to extract the land use classification of the coastal zone in the study area. Cultivated land is the main land type in the study area, and the impervious surface is the fastest growing. The degree of artificial development of the whole study area is gradually increasing, and the coastal beach area is greatly reduced, and the impervious surface area is greatly increased. Wetland and impervious surface are the two most dramatic changes in the study period. Wetland is mainly transformed into other surface features, while impervious surface is mainly transformed into other surface features.
Synthesis of flower-like CoOOH with hierarchical micro/nano-structure as a catalyst for peroxymonosulfate activation
Authors: Xia Qiang , Zheng Lin , Liao Xiaogang , Li Gang
Published: June 2021

In this work, hierarchical flower-like CoOOH assembled from many nanoflakes with a thickness of 20 nm was fabricated by a simple chemical bath deposition (CBD) method, and its performance as a heterogenous catalyst to activate peroxymonosulfate (PMS) for degradation of methylene blue (MB) solution was explored. The results show that CoOOH/PMS is a high efficient system for MB removal, in which 91.95% degradation of MB can be realized within 25 min. Influences of process parameters, including dosage of PMS, addition of catalyst, and co-existed anions on MB degradation were also investigated. It is found that the degradation rate of MB increases with the increase of the amount of PMS from 0.15 mmol·L-1 to 0.45 mmol·L-1. In such PMS concentrations ranges, CoOOH catalyst amount of 0.03 g·L-1 is adequate for PMS activation in the reaction system. The presence of Cl-1and HCO3- anions has a negative effect on MB degradation, while SO42- has no significant influence. In addition, quenching experiments were conducted and SO4 ·- is confirmed as the main active specie during the MB degradation process. Moreover, cycling runs proven that CoOOH could be re-used to activate PMS for MB degradation without notable activity reduction. These results suggest that hierarchical CoOOH is a promising PMS activator for organic pollutant removal.
Application and Exploration of Carbon Dioxide R744 as Refrigerant and Secondary Refrigerant in Refrigerating Unit of Commercial Super
Authors: Guangpeng Li , Qi Wang , Changbo Shao
Published: June 2021

In this paper, the cascade refrigeration system and the load cooling system of the natural working medium are integrated as one unit system, which can meet the needs of different temperature zones of refrigerating in supermarkets. The concrete implementation scheme of the unit system with R717 as high temperature refrigerant, CO2 as low temperature refrigerant and carrier refrigerant was designed. According to the actual load of commercial super, the design and calculation of NH3 refrigerant system, CO2 refrigerant carrier system and CO2 cryogenic system were carried out. Through calculation and testing, the ideal refrigeration effect of the unit is obtained. Compared with the traditional unit, the energy saving is 20%, emission reduction (translated into CO2 emission) is 40%, and the operation cost is reduced by 20%.
Research on the Extraction Process in Aqueous Two-Phase System of Moringa Leaf Flavonoids
Authors: Wang Rui , Zhang Xueqin , Zhou Qian
Published: June 2021

Moringa leaves were used as raw materials, ethanol and ammonium sulfate were used to construct a aqueous two-phase system to extract the flavonoids from Moringa leaves. The solid-liquid ratio, ethanol content, ultrasonic extraction time, and ultrasonic extraction temperature were selected as single factors, and the extraction process of flavonoids was optimized through single-factor experiments and orthogonal experiments. The optimal process was: 1:110 of solid-liquid ratio, 45 % of ethanol concentration, 15 minutes of ultrasonic extraction time, 70 °C of ultrasonic extraction temperature. Under this condition, the extraction rate of Moringa leaf flavonoids reached 8.37 %.
The Theoretical Total Synthesis of an Aromatic Esters of the Crinane Amaryllidaceae Alkaloid Ambelline
Authors: Liu Danyang , Zhou Zhijian , Liu Hao
Published: June 2021

A series of crinane-type alkaloid ambelline derivatives were assessed for their potency to inhibit both acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE), which has been shown to be effective medicine for the treatment of Alzheimer’s disease. However, no enzyme modification has been reported total synthesis. In this work, two possible theoretical synthesis paths of Crinane-type alkaloid ambelline were discussed in this article. The major difficulty of the proposed synthesis was the synthesis of the quaternary carbon. One of the approaches emphasized on the reactions between cyclic and heterocyclic compounds and substrates on the intermediates to generate the quaternary carbon shown on the desired product. The other approach utilized series of amine reactions and Michael addition to create the precursor for the reactant in the Diels-Alder reaction and, therefore, the quaternary carbon, and finally, the desired natural product was obtained after a weak acid workup. The synthesis of ambelline has the potential to provide new pathways for treatment of Alzheimer’s disease.
Synthesis, characterization and photoluminescence properties of Tm3+-doped Ca2YTaO6 blue-emitting phosphors
Authors: Li Jianhua , Huang Jinyu , Liao Jing , Fu Jinjin , Deng Bin
Published: June 2021

A series of Ca2YTaO6: Tm3+ blue-emitting phosphors were firstly prepared by the solid-state method. The phase formations and purity of Ca2YTaO6: xTm3+ (x = 0.3%-5% mol) were verified by X-ray powder diffraction. The morphological characteristics of Ca2YTaO6: 0.005Tm3+ were detected by scanning electron microscopy (SEM). Photoluminescence properties were discussed by emission (λem = 460 nm) and excitation (λex = 359 nm) spectra. The critical doping concentration of the products was 0.005 mol. The proposed concentration quenching mechanism in Ca2YTaO6 materials was the electric multipole interaction. Besides, the color coordinates (0.1408, 0.0891) of Ca2YTaO6: 0.005Tm3+ were located in blue region. The results suggested the Ca2YTaO6: Tm3+ phosphors can be promising blue-emitting components for the WLED applications.
Recombinant protein expression and purification experiments based on SARS-CoV-2 Mpro
Authors: Huang Jin
Published: June 2021

Mpro is one of the most important drug targets of the novel Coronavirus. In this study, a series of potential compounds were obtained through virtual drug screening targeting Mpro. Using the key protease (Mpro) of SARS-COV-2 as the drug lead target for virtual drug screening has become a hot topic in current virus research. Mpro plays a key role in virus replication and transcription. Therefore, the key experimental strain of Escherichia coli containing Mpro is commonly used to inhibit drugs from Mpro. In this study, Mpro gene was located on peT-28A vector, and the size of the recombinant protein was about 36 kDa. The e. Coli expression strain BL21(DE3) containing Mpro was inoculated and cultured.
Pretreatment Method for Peroxides Decon Water Before GC Analysis of HD, VX, and GD
Authors: Xu Mengxue , Zhang Hongpeng , Zhu Haiyan , Wang Lianyuan , Miao Ting
Published: June 2021

Peroxides like sodium percarbonate (SPC) and sodium percarbonate-acetylsalicylic acid (SPC-Aspirin) can be used to destroy chemical warfare agents (CWAs) such as HD, VX and GD due to the former's oxidation capacity and nucleophilicity. In this paper, experiments were performed to study factors affecting CWAs recovery from peroxides decontaminant water (decon water) and develop the method to recover residual CWAs from peroxides decon water before GC analysis. Results showed that extraction solvent and neutralization were important for high CWA recovery. DCM was more suitable than PE as extractant for most samples except SPC decon water containing HD. Sodium sulfite could well neutralized decontaminant reactivity in decon water. When suitable conditions of simultaneous neutralization and extraction were carried, CWAs recovery from SPC decon water were greater than 90% at a concentration range of 10 mg l-1 to 10000 mg l-1, the recovery of HD, VX and GD from SPC-Aspirin decon water was more than 90%, 80% and 95% respectively at a concentration range of 100 mg l-1 to 10000 mg l-1, while CWAs recovery were relatively lower from SPC-Aspirin decon water with CWAs concentration of 10 mg l-1 due to the degradation of CWAs during pretreatment processes.
The effect of composite reducing agent on the reduction process and the tail gas of carbon-containing pellets
Authors: Wang Bo , Ding Xueyong , Zhang Xiaofei , Ju Tianhua , Li Shigang
Published: June 2021

In order to explore a reasonable way for the efficient utilization of coal resources in the ironmaking process. In this paper, lignite and bituminous coal are used as reducing agents, and two types of vanadium-titanium magnetite composite reducing agent pellets are prepared for different content ratios and mixed forms of the two coal powders. Under the simulated rotary kiln pre-reduction conditions, the influence of the ratio and mixing of pulverized coal on the metallization rate and tail gas composition of the reduction process was explored. The results show that increasing the proportion of high volatile lignite is beneficial to the reduction of pellets and can obtain pellets with a higher metallization rate. Under the new pre-reduction process conditions of the rotary kiln, the vanadium-titanium magnetite double-layer pellet with 75wt% lignite inside and 25wt% bituminous coal outside has the highest metallization rate of about 76%. At the same time, this new type of composite reducing agent pellets reduced gas emissions. This pellet is of great significance to the coal-based ironmaking process.
In-situ marine gas hydrate production methane leaks electrical monitoring system
Authors: Wu Hanfu , Guo Xiujun , Wu Jingxin , Zhang Yufeng
Published: June 2021

In the process of gas hydrate exploitation, methane leakage needs to be monitored in real time, so an in-situ electrical monitoring system for methane leakage is designed. The monitoring system is mainly composed of monitoring cable, acquisition station, power module and general control platform. According to the electrical principle, the system carries out regional monitoring on the seabed formation, forms the resistivity map, and realizes methane leakage monitoring. The cost of the monitoring system is low, and it can be remotely controlled or automatically collected data according to the preset program, so the system has good application and research value.
Performance of rice straw fiber improving the drying of waste activated sludge
Authors: Li Xue , Wang Lingyu , Huang Jing , Yi Huishuang , Xu Zhiming , Zhou Hao
Published: June 2021

The high moisture content of the excess sludge in the sewage treatment plant has brought great difficulties to the subsequent treatment. In this study, rice straw fiber was collected as a conditioner for adding to the sludge. The effect of different grain diameter and dosages of straw fiber on sludge drying efficiency were investigated under different temperatures. Drying temperature is one of the most important factors affecting sludge drying rate. Compared with the original sludge, the drying efficiency of sludge adding rice straw fiber was higher. The effect of 35-80 straw fiber was 20%, and the water content decreased from about 70% to less than 10%. The effect of straw fiber particle size on sludge drying is affected by temperature, and the particle size should be taken into account at low temperature.
Decontamination performance of air filter paper impregnated with zirconium hydroxide on sulfur mustard
Authors: Huang Xingqi , Zhao Ting , Yan Chunxiao , Jin Yanren , Wu Yue , Zhang Lingxuan
Published: June 2021

Using zirconium hydroxide as a decontaminant, a kind of self-decontaminating air filter paper that can effectively degrade HD was successfully prepared by impregnating. The morphology and filtration efficiency of the filter paper before and after immersing were compared. The filtration efficiency increased linearly and slowly, with the regression equation: η=0.0001L+99.971. The liquid-solid decontamination reaction of HD on zirconium hydroxide powder and self-decontaminating filter paper conformed to the kinetic of quasi-first-order reaction and found that half-lives were 0.4 h and 2.1 h respectively. Good degradation performance for HD was exhibited and the degradation rate reached more than 99 % in 12 hours. Reaction products were analysed by GC-MS, which displayed that HD was decomposed through the substitution of chlorine and the elimination of H on α-C. The ultimate decontamination products were thiodiglycol and 2-hydroxyethyl vinyl sulfide without erosive toxicity.
Study on Technological Process Innovation of Non-Cyanide Leaching
Authors: Chao Xu , Mingming Cai , Tengyue Gao , guangsheng Li , xingfu Zhu , Zhongbo Lu , Yanbo Chen , juntong Zhang , Guanglin Qin , Qiang Ji , Congquan Yu
Published: June 2021

Nowadays, there are many gold leaching processes, and the dominant one is cyanidation, but the virulence of cyanidation seriously endangers the environment and human health. In order to reduce environmental pollution and improve the recovery rate of gold, metallurgical workers put forward a variety of new gold leaching methods, which can be roughly divided into two types: one is to develop pretreatment technology on the basis of traditional cyanidation method; The other is non-cyanide leaching of gold. Based on the existing Non-Cyanide leaching technology, this paper puts forward the process innovation of Non-Cyanide leaching technology, thiourea method and dilute nitric acid pre-oxidation treatment process. The thiourea non-cyanide leaching system was investigated. According to the leaching situation of gold and silver in raw ore, the innovative scheme of gold and silver leaching technology was selected. Compared with other treatment methods, thiourea method and dilute nitric acid pre-oxidation treatment technology overcome the danger of high pressure, and the nitrogen oxide gas produced in the dilute nitric acid oxidation process can be recycled, which basically does not pollute the environment.