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2023

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Articles 5221 - 5250 of 9780

Full-Text Articles in Engineering

User Classification Based On Mouse Dynamic Authentication Using K-Nearest Neighbor, Didih Rizki Chandranegara, Anzilludin Ashari, Zamah Sari, Hardianto Wibowo, Wildan Suharso Apr 2023

User Classification Based On Mouse Dynamic Authentication Using K-Nearest Neighbor, Didih Rizki Chandranegara, Anzilludin Ashari, Zamah Sari, Hardianto Wibowo, Wildan Suharso

Makara Journal of Technology

Mouse dynamics authentication is a method for identifying a person by analyzing the unique pattern or rhythm of their mouse movement. Owing to its distinctive properties, such mouse movements can be used as the basis for security. The development of technology is followed by the urge to keep private data safe from hackers. Therefore, increasing the accuracy of user classification and reducing the false acceptance rate (FAR) are necessary to improve data security. In this study, we propose to combine the K-nearest neighbor method and simple random sampling and obtain a sample from a dataset to improve the classification of …

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Remote Alignment Fixing Device With Vizir Marks In Base Lcd Indicator, Nodirbek Rustambekovich Yusupbekov, Zahidov Muratovich Nematjon Apr 2023

Remote Alignment Fixing Device With Vizir Marks In Base Lcd Indicator, Nodirbek Rustambekovich Yusupbekov, Zahidov Muratovich Nematjon

Chemical Technology, Control and Management

The article substantiates the needs to increase the level of automation of methods and geodetic support of geometric parameters during the construction of buildings and structures. In particular, the method of alignment measurements is considered. This is widely used in determining deviations from the straightness and alignment of the installation of elements in engineering building structures, including hydraulic structures, as well as in the control of process equipment installations, rolling mills, conveyor lines, crane tracks, when monitoring precipitation. and deformations of techno objects. One of the methods of alignment measurements with the use of a visual-optical device – aliniometer and …

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The Magnetic Chain Mathematical Models Of A New Angular Displacement Converter With A Variable Active Area Of A Movable Core, Sultan Faizullayevich Аmirov, Ulugbek Shukhratovich Mamadaliyev, Islom Azim Ugli Karimov Apr 2023

The Magnetic Chain Mathematical Models Of A New Angular Displacement Converter With A Variable Active Area Of A Movable Core, Sultan Faizullayevich Аmirov, Ulugbek Shukhratovich Mamadaliyev, Islom Azim Ugli Karimov

Chemical Technology, Control and Management

The article develops mathematical models of the magnetic chain of new differential type angular displacement transformer converter with a variable active area of the movable core, in which the width of the movable ferromagnetic core is a function of the angular displacement of the converter. In this case, the magnetic chain of the converter, divided into three characteristic (before the mobile ferromagnetic core, ferromagnetic core and after the ferromagnetic core) sections, is considered as a magnetic chain with distributed parameters. It is established that when the magnetic resistance of the magnetic chain steel part is not taken into account, the …

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Choice Of Instruments For Verification And Calibration Of Gas Analyzers, Ortigali Khakimov, Paraxat Mayliyevna Matyakubova, Mirolim Muhammad O'G'Li Maxmudjonov Apr 2023

Choice Of Instruments For Verification And Calibration Of Gas Analyzers, Ortigali Khakimov, Paraxat Mayliyevna Matyakubova, Mirolim Muhammad O'G'Li Maxmudjonov

Chemical Technology, Control and Management

This article analyzes the process of metrological control of gas analyzers and metrological requirements for them. The current state of the standards used in the state metrological control of gas analyzers and the results of the analyzes were studied. The task of choosing the measuring instruments used in the verification process and optimizing the requirements for them is set. An experimental verification process was organized in three groups using several measuring devices, and the reliability of the verification results was assessed. With the use of modern measuring instruments, a graph of the output value was built during the experimental verification …

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Power Amplifier Based On Composite Injection-Voltaic Transistors, Nodira Batirdjanovna Alimova Apr 2023

Power Amplifier Based On Composite Injection-Voltaic Transistors, Nodira Batirdjanovna Alimova

Chemical Technology, Control and Management

The problem of high-current radio engineering devices is related to the fact that the use of high-power transistors and other semiconductor devices is limited by such a phenomenon as a secondary breakdown, in which there is a sharp decrease in the voltage on the device with simultaneous internal current lacing, and the device fails. To solve the problem of secondary breakdown, schemes have been proposed that operate stably at reverse voltage values 4-5 times higher than usual and at power dissipation 2-3 times higher than the maximum allowable power for an individual device. The problem is proposed to be solved …

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Modeling And Adjustment Of A Fuzzy Controller In A Bioreactor Control System, Mahmudov Giyosjon Baqoyevich Apr 2023

Modeling And Adjustment Of A Fuzzy Controller In A Bioreactor Control System, Mahmudov Giyosjon Baqoyevich

Chemical Technology, Control and Management

The article describes the modeling and configuration of a fuzzy controller for the control system of the bacterial oxidation of hard-to-enrich gold-bearing sulfide ores. The simulated logical fuzzy controller allows you to save the consumption of refrigerant water consumed in the process by 4,3%, using it to control the process of bacterial oxidation.

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Mathematical Description Of A Bleach Impregnation Reservoir, Bekobod Ibragimov Apr 2023

Mathematical Description Of A Bleach Impregnation Reservoir, Bekobod Ibragimov

Chemical Technology, Control and Management

This article discusses the issues of constructing a mathematical model of the technological process of bleaching textile materials in an impregnating reservoir using the heat balance equation, on the basis of which a qualitative analysis of the dynamic properties of an object has been carried out in order to create highly efficient control systems with the use of energy-saving technologies. While constructing a mathematical model characterizing the established and non-established modes of the control object (impregnating reservoir) used changes in heat flow and mass velocity of the incoming tissue. An algorithm for constructing a mathematical model of the process of …

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What If Plants Compute?, Jordi Vallverdú Apr 2023

What If Plants Compute?, Jordi Vallverdú

Animal Sentience

The unexpended cognitive capacities of plants suggest the possibility of combining them with advances in computation. It is important to explore such a new field of research despite the incompleteness of the empirical support for it.

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Energy Efficient Integrated Mems Neural Network For Simultaneous Sensing And Computing, Hamed Nikfarjam, Mohammad Megdadi, Mohammad Okour, Siavash Pourkamali, F. M. Alsaleem Apr 2023

Energy Efficient Integrated Mems Neural Network For Simultaneous Sensing And Computing, Hamed Nikfarjam, Mohammad Megdadi, Mohammad Okour, Siavash Pourkamali, F. M. Alsaleem

Durham School of Architectural Engineering and Construction: Faculty Publications

Biological systems seamlessly combine multiple functions in lightweight and energy-efficient structures. Such capability in synthetic structures would be desirable in numerous engineering applications such as aerospace, robotics and wearable devices. Here we report an integrated silicon-based structure configured to sense, perform different classification algorithms, and produce an action signal within the same physical layer. The algorithms are coded in the mechanical responses of the sensing elements of multiple coupled micro-electromechanical systems (MEMS), simultaneously capturing acceleration measurements to produce an actuated signal. This all-in-one structure operates with zero circuitry and low power consumption. As a demonstration, we designed and fabricated a …

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Neutrosophic Mcdm Methodology For Evaluation Onshore Wind For Electricity Generation And Sustainability Ecological, Karam M. Sallam, Ali Wagdy Mohamed Apr 2023

Neutrosophic Mcdm Methodology For Evaluation Onshore Wind For Electricity Generation And Sustainability Ecological, Karam M. Sallam, Ali Wagdy Mohamed

Neutrosophic Systems with Applications

The conviction in the necessity of renewable energy has been prompted by both the constantly increasing need for power production and the ecological issues of recent years. When it comes to generating power in a sustainable manner, wind is among the most essential renewable energy sources. This research attempts to present a structural technique for assessing the performance of operational onshore wind facilities with respect to the three dimensions of sustainability. The energy production, environmental effect, and practicability of onshore wind facilities are all dependent on accurate assessments. Wind resources, site accessibility, environmental impact, permitting and regulatory requirements, turbine technology, …

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Unity Power Factor Operation In Microgrid Applications Using Fuzzy Type 2 Nested Controllers, Ehab Bayoumi Apr 2023

Unity Power Factor Operation In Microgrid Applications Using Fuzzy Type 2 Nested Controllers, Ehab Bayoumi

Mechanical Engineering

The issue of low-power factor operation microgrids was reported for several layouts. Although numerous power factor improvement strategies have been applied and tested, various concerns remain to be addressed such as transient performance, simplicity of implementation, and satisfying the power-quality standards. The presented research aimed to design and implement controllers that can improve the transient response of microgrids due to changes in the load demand and achieve a near-unity power factor at the AC grid side, to which the DC microgrid is connected. Due to the nonlinear nature of microgrids, as they rely on power electronics converters, a Fuzzy type …

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Mathematical Description And Algorithm For Solving The Model Of The Ionite Regeneration Process In The Ion Exchange Method Of Water Softening, Djalolitdin Paxritdinovich Mukhitdinov, Nilufar Abdusami Qizi Yunusova Apr 2023

Mathematical Description And Algorithm For Solving The Model Of The Ionite Regeneration Process In The Ion Exchange Method Of Water Softening, Djalolitdin Paxritdinovich Mukhitdinov, Nilufar Abdusami Qizi Yunusova

Chemical Technology, Control and Management

Based on the modern representation of the water softening process by the ion exchange method, modeling was carried out, an algorithm was developed and the ionite regeneration process was calculated in a water softening plant with a fixed ionite layer. To solve the system of equations of the model, special, but simple enough for use in engineering calculations, techniques and methods have been developed and applied. The constructed model and its solution algorithm can be used to predict the process of ionite regeneration in an ion exchange apparatus. It can also be used to calculate the time of the ionite …

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Synthesis Methods And Algorithms For Expanding The Dynamic Range Of The Adc, Jumaev Odil Abdujalilovich, Rashidov G'Olibjon Xayriddinovich Apr 2023

Synthesis Methods And Algorithms For Expanding The Dynamic Range Of The Adc, Jumaev Odil Abdujalilovich, Rashidov G'Olibjon Xayriddinovich

Chemical Technology, Control and Management

The modern development of new technologies, in particular, the intensive use of programmable logic integrated circuits in digital information processing tasks, allows for algorithmically and programmatically solving problems, opens up real opportunities to increase accuracy and ensure the required signal conversion speed, and also, it will be possible to take into account the effects of noise and their elimination over the entire time interval band. The article discusses the main methods of digital information processing, analyzes the ways and possibilities of expanding the dynamic range of analog-to-digital converters, as well as the synthesis of appropriate conversion devices, primarily digital filters.

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Synergetic Synthesis Of Multivariate Nonlinear Dynamic Objects, Isamiddin Siddikov, Komil Usmanov Apr 2023

Synergetic Synthesis Of Multivariate Nonlinear Dynamic Objects, Isamiddin Siddikov, Komil Usmanov

Chemical Technology, Control and Management

Based on the synergetic approach, the article solves the problem of analyzing a chemical reactor as a control object and formulates recommendations on the structural and topological synthesis of various control system options. The main feature of technological control objects, in which, as a result of hydromechanical, physical, chemical influences on the flows of the starting substances, their physical properties, state of aggregation and composition change, is their multidimensionality, nonlinearity, multiconnectedness, as well as parametric uncertainty of the mathematical model at the design stage. This type of facility includes a chemical reactor, thermal management, which in most cases is carried …

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Methods And Algorithms For Monitoring And Prediction Of Various Fire Hazardous Situations, Mizaakbar Xakkulmirzayevich Hudayberdiyev, Oybek Zokirovich Koraboshev Apr 2023

Methods And Algorithms For Monitoring And Prediction Of Various Fire Hazardous Situations, Mizaakbar Xakkulmirzayevich Hudayberdiyev, Oybek Zokirovich Koraboshev

Chemical Technology, Control and Management

This article analyzes emergency situations arising from natural disasters (fires, explosions, earthquakes, floods, landslides, etc.) and man-made accidents. The event in which the values of fire risks in the area decrease uniformly and at the same time the amount of fire risks is minimal is considered optimal. Models, methods, and logistic regression algorithm have been used to predict fire hazard situations and identify potential fire safety measures.

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Mechanical Properties And Morphological Alterations In Fiber-Based Scaffolds Affecting Tissue Engineering Outcomes, James Dolgin, Samerender Nagam Hanumantharao, Stephen Farias, Carl G. Simon, Smitha Rao Apr 2023

Mechanical Properties And Morphological Alterations In Fiber-Based Scaffolds Affecting Tissue Engineering Outcomes, James Dolgin, Samerender Nagam Hanumantharao, Stephen Farias, Carl G. Simon, Smitha Rao

Michigan Tech Publications, Part 1

Electrospinning is a versatile tool used to produce highly customizable nonwoven nanofiber mats of various fiber diameters, pore sizes, and alignment. It is possible to create electrospun mats from synthetic polymers, biobased polymers, and combinations thereof. The post-processing of the end products can occur in many ways, such as cross-linking, enzyme linking, and thermal curing, to achieve enhanced chemical and physical properties. Such multi-factor tunability is very promising in applications such as tissue engineering, 3D organs/organoids, and cell differentiation. While the established methods involve the use of soluble small molecules, growth factors, stereolithography, and micro-patterning, electrospinning involves an inexpensive, labor …

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Experimental And Theoretical Analysis Of Nonlinear Triboelectric Energy Harvester For Frequency Up-Conversion Applications, Hadeel A. Abumarar Apr 2023

Experimental And Theoretical Analysis Of Nonlinear Triboelectric Energy Harvester For Frequency Up-Conversion Applications, Hadeel A. Abumarar

Mechanical Engineering Theses

With the development of micro-sensors and wireless applications, energy harvesting has become an effective method for self-powering. However, ambient energy is only limited to below 100Hz, which restricts the energy harvester designs to this range resulting in
an impractical bulky and large-scale harvester. Therefore, in this thesis, we investigated
frequency Up and Down conversion energy harvesters to benefit from the high-frequency oscillations and transferred them to the ambient vibration ranges. Toward this, the triboelectric transduction mechanism has been utilized for a frequency-up conversion for energy harvesting applications, while the piezoelectric transduction mechanism is used for frequency-down
conversion for mass sensing …

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Numerical Simulation On Development Effect Of Tar-Rich Coal Through In-Situ Conversion By Convective Heating In Huangling Mining Area, Dong Guangshun, Zhu Chaofan, Li Jiazong, Xu Shaotao, Guo Wei Apr 2023

Numerical Simulation On Development Effect Of Tar-Rich Coal Through In-Situ Conversion By Convective Heating In Huangling Mining Area, Dong Guangshun, Zhu Chaofan, Li Jiazong, Xu Shaotao, Guo Wei

Coal Geology & Exploration

The effective development of tar-rich coal to extract oil is of great practical significance to alleviate the oil and gas tension in China, and the convective heating technology of underground in-situ mining is one of the main technologies for the effective development of tar-rich coal. Herein, the mining effect and energy return rate of the two heating media (high-temperature steam and nitrogen) under different injection pressures were studied by convective heating technology for underground in-situ conversion mining based on the tar-rich coal seam of Yan'an Formation in Huangling Mining Area. The results show that: the heating efficiency of steam injection …

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Table Of Contents, The Editors Apr 2023

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Effect Of Amf-Maize Combination On Water And Salt Distribution In Soil Under The Dump Reconstruction Mode Of “Topsoil-Aquifer-Aquitard”, Bi Yinli, Yang Wei, Ke Zengming, Wu Chao, Li Mingchao, Xue Chao Apr 2023

Effect Of Amf-Maize Combination On Water And Salt Distribution In Soil Under The Dump Reconstruction Mode Of “Topsoil-Aquifer-Aquitard”, Bi Yinli, Yang Wei, Ke Zengming, Wu Chao, Li Mingchao, Xue Chao

Coal Geology & Exploration

The distribution of soil water and salt severely affects the ecological reconstruction and plant configuration modes at coal mine dumps. To investigate the characteristics of soil water and salt distribution under the three-layer reconstruction mode of “topsoil-aquifer-aquitard” in coal mine dump under the influence of mycorrhizal plants, laboratory soil column test was conducted, in which the soil was treated in three ways: planting maize and inoculating with arbuscular mycorrhizal fungi (YM+AMF), planting maize (YM) only, and no planting of maize + no inoculation with bacteria (CK). The results showed that: (1) The different treatments have no significant effect on the …

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Effects Of Actinomycetes On Root Growth Of Onobrychis Viciaefolia And Rhizosphere Soil Fertility In Dumping Site Of Open-Pit Mine In Arid Area, Cao Shumiao, Wang Qiangmin, Yang Fan, Yang Jian, Zhang Haihan, Xu Ganggang, Zhu Shibin Apr 2023

Effects Of Actinomycetes On Root Growth Of Onobrychis Viciaefolia And Rhizosphere Soil Fertility In Dumping Site Of Open-Pit Mine In Arid Area, Cao Shumiao, Wang Qiangmin, Yang Fan, Yang Jian, Zhang Haihan, Xu Ganggang, Zhu Shibin

Coal Geology & Exploration

In order to resolve the issue of soil degradation in the dumping site of open-pit coal mine in arid area, the effects of actinomycetes on the root growth and rhizosphere soil fertility of onobrychis viciaefolia in the dumping site of Xinjiang Heishan Open-pit Coal Mine were investigated by highly efficient actinomycete inoculation and in-situ pot experiment. The results show that: (1) Under the drought conditions, actinomycetes inoculation could significantly promote the development of root morphology and the growth of onobrychis viciaefolia. Compared with the control without actinomycetes inoculation, the total root length, average root diameter, root surface area and …

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Quantification Of Various Types Of Biases In Large Language Models, Sudhashree Sayenju Apr 2023

Quantification Of Various Types Of Biases In Large Language Models, Sudhashree Sayenju

Doctor of Data Science and Analytics Dissertations

Natural Language Processing (NLP) systems are included everywhere on the internet from search engines, language translations to more advanced systems like voice assistant and customer service. Since humans are always on the receiving end of NLP technologies, it is very important to analyze whether or not the Large Language Models (LLMs) in use have bias and are therefore unfair. The majority of the research in NLP bias has focused on societal stereotype biases embedded in LLMs. However, our research focuses on all types of biases, namely model class level bias, stereotype bias and domain bias present in LLMs. Model class …

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Mechanical Property Evaluation Of Coal Bed And Favorable Area Prediction Of Coalbed Methane (Cbm) Development Based On Well Logging: A Case Study Of No. 3 Coal Bed In Zhengzhuang Block, Southern Qinshui Basin, Qiu Feng, Liu Jinhua, Cai Yidong, Liu Dameng, Sun Fengrui Apr 2023

Mechanical Property Evaluation Of Coal Bed And Favorable Area Prediction Of Coalbed Methane (Cbm) Development Based On Well Logging: A Case Study Of No. 3 Coal Bed In Zhengzhuang Block, Southern Qinshui Basin, Qiu Feng, Liu Jinhua, Cai Yidong, Liu Dameng, Sun Fengrui

Coal Geology & Exploration

Accurately grasping the mechanical properties of coal is of great significance to reservoir reconstruction and CBM development. Herein, the prediction model of shear wave time difference in coal reservoir based on multiple logging parameters and the brittleness index evaluation model based on dynamic and static mechanical parameter conversion were established for the research horizon of No.3 coal bed in Zhengzhuang Block. The brittleness index of coal reservoir in the study area was comprehensively evaluated by elastic parameter method. By this way, it is found that the brittleness index of coal bed in single well is obviously affected by “boundary effect” …

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Preface To The Special Issue On Lithium-Sulfur Batteries, Jia-Jia Chen, Ren-Jie Chen, Zhong Jin Apr 2023

Preface To The Special Issue On Lithium-Sulfur Batteries, Jia-Jia Chen, Ren-Jie Chen, Zhong Jin

Journal of Electrochemistry

No abstract provided.

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Threshold Segmentation Method Of Ct Scanning Data Of Coal And Rock Samples Considering Beam Hardening Effect And Its Application, Wang Kai, Fu Qiang, Xu Chao, Ai Zibo, Wang Lei, Shu Longyong Apr 2023

Threshold Segmentation Method Of Ct Scanning Data Of Coal And Rock Samples Considering Beam Hardening Effect And Its Application, Wang Kai, Fu Qiang, Xu Chao, Ai Zibo, Wang Lei, Shu Longyong

Coal Geology & Exploration

Beam hardening is a common phenomenon in the application of industrial computerized tomography (ICT). It can cause different grayscale values in components with the same density, which affects the threshold segmentation and later reconstruction of components seriously. Herein, study was conducted on the distribution law of grayscale values under the effect of beam hardening, so as to segment the CT scanning data of coal and rock samples under the beam hardening effect accurately. Through the study, it is found that the change in grayscale value on the grayscale beam could truly reflect the change in component density, which is proved …

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Sedimentary Coal-Controlling Effect And Coal-Forming Model Of Paleogene Coal Measures In Paralic Faulted Basin：A Case Study Of Huangxian Basin, Shandong Province, Wu Yue, Wang Dongdong, Wang Hailiang, Liu Haiyan, Li Zengxue, Zheng Xue Apr 2023

Sedimentary Coal-Controlling Effect And Coal-Forming Model Of Paleogene Coal Measures In Paralic Faulted Basin：A Case Study Of Huangxian Basin, Shandong Province, Wu Yue, Wang Dongdong, Wang Hailiang, Liu Haiyan, Li Zengxue, Zheng Xue

Coal Geology & Exploration

There are abundant coal-type oil and gas resources in Chinese sea area, but few researches have been conducted on the coal-type source rock, which seriously restricts the exploration of coal-type oil and gas resources in the sea area. Herein, this study on sedimentary coal-controlling effect and coal-forming model was carried out based on Huangxian Basin that is a paralic faulted basin with same coal-forming period, similar geological conditions and high degree of research for the coal basins in the sea area. Specifically, the pattern, evolution and sedimentary coal-controlling effect of paleogeography during the coal-forming period were reconstructed with full consideration …

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Deterioration Characteristics Of Water-Rock Interaction On Combustion Metamorphic Rocks In Northern Shaanxi, Hu Xin, Sun Qiang, Yan Changgen, Zhao Chunhu, Wang Shaofei Apr 2023

Deterioration Characteristics Of Water-Rock Interaction On Combustion Metamorphic Rocks In Northern Shaanxi, Hu Xin, Sun Qiang, Yan Changgen, Zhao Chunhu, Wang Shaofei

Coal Geology & Exploration

There are a lot of combustion metamorphic (CM) rocks formed by high temperature baking of coal fires in the border area of Shaanxi, Shanxi and Inner Mongolia in the northeastern margin of Ordos Basin. Compared with the virgin rock, the rock mass subjected to combustion metamorphism is broken in structure, with pores developed, and a large number of dangerous rock masses are formed under the long-term water-rock interaction. Herein, 50 dry-wet cycle experiments were carried out with the CM rocks in Daliuta Area of Shenmu in Shaanxi Province. Meanwhile, the changes in the physical and mechanical properties of CM rocks …

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Ecological Natural Restoration And Its Artificial Promotion Mode In Coal Mining Area, Liu Wei, Yin Qinrui, Liu Xianghong Apr 2023

Ecological Natural Restoration And Its Artificial Promotion Mode In Coal Mining Area, Liu Wei, Yin Qinrui, Liu Xianghong

Coal Geology & Exploration

The natural ecological restoration is an important direction of the national ecological restoration policy. Taking limited artificial measures to promote the natural ecological restoration in coal mining areas is in line with the actual engineering requirements under the context of "double carbon" goal and thus has a better prospect in market application. Herein, the research results in terms of natural ecological restoration were sorted out systematically for the three main types of damaged land in the coal mining areas. Meanwhile, the concept connotation of artificial promotion of natural restoration was studied and analyzed. Besides, the governance mode by zone and …

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Hydrochemical Characteristics And Source Analysis Of Mine Water In Shallow Coal Seams In Shaanxi And Inner Mongolia Contiguous Area, Wang Yutong, Wang Hao, Wang Tiantian, Xue Jiankun, Shang Hongbo, Zhou Zhenfang Apr 2023

Hydrochemical Characteristics And Source Analysis Of Mine Water In Shallow Coal Seams In Shaanxi And Inner Mongolia Contiguous Area, Wang Yutong, Wang Hao, Wang Tiantian, Xue Jiankun, Shang Hongbo, Zhou Zhenfang

Coal Geology & Exploration

In order to study the hydrochemical characteristics and sources of mine water under the mining of shallow coal seams in the contiguous area of Inner Mongolia and Shaanxi, the hydrochemical characteristics and the formation action of mine water in this area were investigated through the study of hydrochemical characteristics, mathematical statistics, ion ratio coefficient method and the hydrogen and oxygen isotopes in combination, by collecting samples of the mine water, groundwater in different aquifers and surface water in the study area. Based on this, the main sources of mine water in the study area were identified. The results show that …

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Visco-Elastic Full-Waveform Inversion Based On Multi-Objective Function, Liang Xu, Ma Yue, Liu Chao, Chen Zhen, Jia Dongdong, Li Zhiyong, Pan Wenyong Apr 2023

Visco-Elastic Full-Waveform Inversion Based On Multi-Objective Function, Liang Xu, Ma Yue, Liu Chao, Chen Zhen, Jia Dongdong, Li Zhiyong, Pan Wenyong

Coal Geology & Exploration

Full-waveform inversion (FWI) is one of the core technologies developed in exploration geophysics. Through FWI, the subsurface velocity structures can be constructed and the attenuation parameter (the quality factor Q) model can be inverted, which is helpful to characterize the types and structures of subsurface media (such as the fluid and collapse column in collapse column). This is significant for the exploration and development of natural resources such as coal, oil and gas. Parameter crosstalk is the key difficulty of visco-elastic FWI. Due to the influences of velocity errors, the inverted Q models contain very strong crosstalk noise. To …

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