Advances in Engineering Technology Research

Initial effects of nitrogen rate on nodulation of peanut in sole and intercropping system in semi-humid area in Liaoning

Thu, 05 Sep 2024 00:00:00 +0800

The maize/peanut intercropping is an important cereal/legume intercropping system in Liaoning. This intercropping system can reduce wind erosion, increase yield and resource use efficiency. To clarify the effects of nitrogen rate on nodulation characteristic of peanut in sole and intercropping system in semi-humid area, a micro-plot experiment was conducted at the Drought-resistant Cultivation Simulation Test Site, Liaoning, Northeast China. Including two cropping system (sole peanut and maize/peanut intercropping) and seven N rates (0, 50, 75, 100, 150, 200 and 300 kg/ha) based on the cropping pattern. The results showed that maize/peanut intercropping have the potential to enhance the nodulation of peanut and there was alleviatory effect on the inhibitory effect of N fertilization on the nodulation of peanut when intercropped with maize in earlier stage in semi-humid area. These advantages can be due to the enhancement of nodule number or facilitation of the single nodule development, or both of them by intercropping with maize. There was interaction between cropping system and the N input. More tests should be done in different climate conditions, agronomics, growing stages, and N rates to clarify the potential of peanut nodulation forming and to maximize the biological N fixation of peanut in intercropping system.

Research on the Collaborative Development and Evolution Mechanism of the New Type Power System Industry Chain

Yufang Jia, Bo Yuan, Yichun Gong — Thu, 05 Sep 2024 00:00:00 +0800

At present, under the multiple strategic overlays of the new development pattern, “dual carbon” goals, and new energy systems, the role and position of China’s energy power industry in serving the overall economic and social development is expanding and elevating. Based on the vision of Chinese path to modernization and the construction requirements of a modern industrial system, this paper studies how China’s power industry will evolve from the current fossil energy-based foundation to a new type power system industry chain based on technological innovation. Therefore, it is necessary to forge a path focusing on mastering key core technologies, with the aim of enhancing the resilience and security level of the industry chain and supply chain. High-quality supply and digital infrastructure should serve as driving force, with the interconnection of electricity and various resource elements as a key task. The industrial application of high-tech and commercial model innovation should be developed as the main methods for the rise of China’s energy power industry.

Study on the Interface Characteristics in Si-C Composite Anode Materials

Zhaowen Huang, Youpeng Li, Jingbo Liu, Xianhua Hou — Thu, 05 Sep 2024 00:00:00 +0800

Due to the volume expansion during the lithium intercalation and deintercalation process, the carbon layer of silicon@carbon gradually falls off, exhibiting low capacity or poor cycling stability. The role of Si-C bonding and interface characteristics in Si@C composite materials on material cycling stability is still unclear. Based on the first principle method, the Si-C bonding and lithium intercalation and deintercalation properties of two Si-C alloys with different space group were studied. The results show that the lithium intecalation formation energy of SiC-1 is only 0.158 eV, much lower than the 0.6537 eV of SiC-2. The volume expansion ratio after lithium intercalation is only 38.9064%, which is basically equivalent to graphite. The bonding mode between Li-Si and Li-C determines whether lithium ions can be reversibly released. The bonding strength of Si-C bonds plays a stabilizing role in the lithium intercalation and deintercalation process, which is beneficial for reducing the volume expansion ratio of lithium intercalation.This work has certain guiding significance for the research of silicon carbon anode materials with high capacity and long cycilc life.

Numerical Simulation Study on the Average Air Velocity Circle in Coal Mine Roadway

Min He — Thu, 05 Sep 2024 00:00:00 +0800

To determine the accurate installation position of the air velocity sensor and ensure that it monitors the average air velocity of the full section of the roadway, a numerical simulation method was employed. The results verified the existence of an average air velocity circle on the section of a fully developed turbulent roadway, where the air velocity at any point on it is equal to the average air velocity of the roadway, and its position is approximately fixed, independent of the size of the roadway air velocity. It revealed the rule that the distance from the top of the average air velocity circle to the roof of rectangle, semi-circular arch, and three-centered arch roadways with smooth walls is 0.11-0.12 times the height of the roadway. Through field tests, it was found that in real underground roadways, the distance from the average air velocity circle to the roof is greater than that in roadways with smooth walls. When installing air velocity sensor in real roadway, the installation position of the sensor should be adjusted appropriately based on the roughness of the roadway wall surface.

Exploring Novel Applications of Chinese Herbal Medicine in Beer Brewing

Jianghua Zhao, Huiquan Liu, Fangyuan Deng, Delin Han — Thu, 05 Sep 2024 00:00:00 +0800

With the rise of health food products, the development of functional beers brewed with medicinal herbs has increasingly become a focus of research. This article provides an overview of the brewing processes involved in herbal beers, examining the potential impacts of these herbs on yeast during fermentation and the resultant beer. Additionally, it briefly introduces several popular varieties of herbal beers, outlining their brewing techniques and highlighting the key functional components that contribute to their health benefits.

Nozzle design and test of water seal lubrication system for large gate

Lin Chen, Dongmei Li, Aoran Wang, Qinxia Zheng — Thu, 05 Sep 2024 00:00:00 +0800

In order to solve the problem of poor lubrication effect of water seal in large gate, three kinds of nozzles with different structures are designed. In order to further explore the best installation form of nozzle, the water flow animation of 3# nozzle at different angles, different installation positions and different water pressures was simulated by using Blender and ANSYS-CFD, the best lubrication effect is obtained when the distance from water seal section is 40mm and the water pressure is 0.5MPa. The experimental results show that the model test results of 3# nozzle are basically consistent with the simulation results, and the optimum 3# nozzle has the best lubrication effect. The research results can provide technical reference for the optimization transformation of water seal lubrication and the design of water seal lubrication for the same type of gate.

The Lichnerowicz formula and residue for Dirac operator with one form

Nan Wang, Jian Wang — Thu, 05 Sep 2024 00:00:00 +0800

In this paper, a Dirac operator with formal perturbation is studied. We study the decomposition formula of the Dirac operator squared, and get the generalized Lichnerowicz formula. According to the relation between the noncommutative remainder of a formal Dirac operator and the trace of the Dirac operator, the noncommutative remainder of a formal Dirac operator can be obtained by directly calculating the trace of the endomorphism.

Research on Adaptive Segmentation Algorithm for Highway Roadside Video Images Based on Unet Networks

Bin Xie, Shuyue Li — Thu, 05 Sep 2024 00:00:00 +0800

Aiming at the existing highway roadside video analysis applications that can't adapt to the rotation of the ballbar and the difficulty that the monitoring area needs to be re-calibrated after the rotation, the adaptive segmentation algorithm is studied. We collect 2370 images of various highway line types, make fine labeled motorway, non-motorized lane, central isolation zone, road environment and other highway video image area segmentation samples, train Deeplabv3, Unet, Pspnet three kinds of deep learning semantic segmentation network respectively, and combine the test results with the comprehensive analysis to select Unet semantic segmentation network, the semantic segmentation prediction and the real intersection and merge. The ratio of semantic segmentation prediction and real intersection reaches 92.45%, detection accuracy reaches 96.32%, and recall rate reaches 95.77%. For different preset positions of the ball machine rotation, adaptive video monitoring to provide different regional coordinates, and according to different regions to allocate different detection capabilities, effectively solve the video analysis algorithms due to the ball machine rotation failure, as well as the need to repeatedly calibrate the problem of manual calibration, and significantly reduce the highway algorithms in different scenes repeated access to the video streams caused by the pressure of network transmission.

Study on Evaluation Indicators for Structural Damage of Pavilion and Dense-eaves Brick-and-stone Ancient Pagodas

Yongjing Tang, Yu Yuan, Lei Hua, Gabriele Milani — Thu, 05 Sep 2024 00:00:00 +0800

The pavilion and dense-eaves structures are the most commonly used forms of brick-and-stone ancient pagodas. Due to the extensive temporal and regional distribution of these ancient pagodas, accurately evaluating the structural damage and safety levels of pavilion and dense-eaves brick-and-stone pagodas is extremely challenging. Based on existing research results on the damage and assessment of brick-and-stone ancient pagodas and continuous attention to their current status, we have chosen the most common used pavilion and dense-eaves structures among brick-and-stone pagodas. According to the typical parts of their architectural structures, construction materials, and building techniques, and considering the effects of earthquakes and climate, we describe the damage to brick-and-stone pagodas and its extent. We propose a safety assessment model for brick-and-stone pagodas.

Isolation and identification of postharvest pathogenic bacteria of winter jujube and antibacterial test of 34 essential oils

Haoyue Jiang, Qiyu Lu, Yongdong Xie, Mingting Xu, Min Guo, Ji Liu — Fri, 06 Sep 2024 00:00:00 +0800

The 'Dali' winter jujube was used as the test object. The postharvest pathogens were isolated, purified and identified . The pathogenicity was determined by Koch's postulates. The antibacterial activity of 34 types of plant essential oils against pathogens with strong pathogenicity was determined. The findings indicated that a fungus with strong pathogenicity was isolated and identified from diseased winter jujube, which was marked as DZ1. The phylogenetic tree showed that the DZ1 strain had a high relationship with Fusarium oxysporum . Among the 34 essential oils, basil, mustard, litsea cubeba and cinnamon essential oils (1000μl/L) had the most significant antibacterial effect on the DZ1 strain, with an inhibition rate of 100%. Clove and garlic essential oils (1000μl/L) had a good antibacterial effect on the DZ1 strain, with an inhibition rate of more than75%. 500μl/L mustard essential oil had the best inhibitory effect on the DZ1 strain, and the the antibacterial rate was still more than 95 % after 12 days of treatment. In summary, it was determined that the pathogen causing post-harvest diseases of winter jujube was Fusarium oxysporum , which had a strong pathogenicity. 500μl/L mustard essential oil had the best inhibitory effect on Fusarium oxysporum .

Isolation and identification of postharvest pathogenic bacteria of mango and antibacterial test of 36 essential oils

Qiyu Lu, Yongdong Xie, Qiliang Guo, Yanzhou Zhu, Mingting Xu, Ji Liu — Fri, 06 Sep 2024 00:00:00 +0800

The ' Kate ' mango was used as the test object, and the post-harvest pathogens were isolated, purified and identified . The pathogenicity was determined using Koch's postulates, and the antibacterial activity of 36 types of plant essential oils against pathogens with strong pathogenicity was determined. The results showed that a highly pathogenic fungus MG1 was isolated and identified from mangoes, and molecular biological identification identified it as Diaporthe pseudophoenicicola . Among the 36 essential oils, achyranthes bidentata, mustard, burdock, clove and litsea cubeba essential oils (1000μl/L) had the most significant antibacterial effect on MG1 strain, with an antibacterial rate of 100%. After 4 days of treatment with 500μl/L clove essential oil, the antibacterial rate of MG1 strain was still more than95%. In summary, the pathogen causing postharvest disease of mango was determined to be Diaporthe pseudophoenicicola , which is highly pathogenic, 500μl/L of clove essential oil was effective against Diaporthe pseudophoenicicola had the best inhibitory effect.

Analysis of the impact of the development of artificial intelligence on the employment of China's labor force

Ping Wang — Tue, 10 Sep 2024 00:00:00 +0800

The development of artificial intelligence affects the employment of labor force in China. The article uses the panel data of 30 provinces in China from 2004 to 2020 to analyze the development trend of AI in China from the spatio-temporal dimension, and finds that the development of AI promotes the two dimensions of the quantity of labor force employment and the quality of the labor force through the two-step system generalized moments estimation (Two-step-SYS-GMM) regression. Meanwhile, regional innovation efficiency is measured with the super-efficient SBM model (US-SBM model) considering non-desired outputs, and it is found that regional innovation efficiency has a positive moderating effect on the dynamic relationship between the two. Then, it proposes coping strategies to improve institutional arrangements, strengthen vocational training and activate innovation factors.

Evaluation and Function Zoning of Geological Environment Carrying Capacity in Dongning-Suifenhe Region,China

Haiyang He, Xinzhi Gao, Weiqiang Huang, Wenyan Xu, Yan Wang — Tue, 10 Sep 2024 00:00:00 +0800

The carrying capacity of the geological environment to human activities is limited, and the maximum limit of this carrying capacity is the geological environment carrying capacity. It is necessary to scientifically understand the concept of geological environment carrying capacity from two dimensions: the geological environmental conditions (the carrier) and human activities (the load). With the entry into force of the document "Consent of the General Administration of Customs to Designation of the Port of Vladivostok, Russia as a Transit Port for Cross-Border Transportation of Domestic Trade Goods," the Dongning-Suifenhe region has ushered in new opportunities for development. How to ensure economic and social development while coordinating the relationship between geological environment and resource development, as well as ecological environmental protection, has become the key to the success of opening up and development. It is imperative to carry out the evaluation of geological environmental carrying capacity and function zoning in the study area. This paper evaluates the background carrying capacity and bearing state of the geological environment in the Dongning-Suifenhe region by using the hierarchical comprehensive index method. The evaluation has determined the degree of favorable geological environmental conditions as well as the degree of impact from human activities on the geological environment and resources. Based on this, geological environment function zoning is conducted, and recommendations on regional development and eco-environmental protection are presented.

Thermodynamic analysis and optimization of carbon capture system

Tue, 10 Sep 2024 00:00:00 +0800

With the acceleration of the global industrialization process, the problem of greenhouse gas emissions is becoming more and more serious. Carbon dioxide is one of the most important greenhouse gases, and carbon capture technology can make an important contribution to the mitigation of climate change. In this paper, Aspen Plus is used to establish a numerical model for thermodynamic analysis of carbon dioxide capture system, and the thermal efficiency and exergic efficiency of system equipment under different conditions are studied. The results show that: When the inlet flue gas temperature of the absorber tower was 35℃, exergic efficiency and exergic efficiency reached the best, while the efficiency of the supplementary liquid cooler decreased with the increase of the outlet temperature. The efficiency of the liquid-rich heater and the liquid-poor cooler decreases with the increase of the inlet and outlet temperature, and the system runs in a better state when the flue gas temperature and the absorber temperature are between 30℃ and 40℃. Exergic efficiency of equipment decreased with the increase of temperature, so research results are of great significance for improving the efficiency of carbon capture system.

Intelligent Diagnostic System for Starter Motor Testers Based on Fuzzy Neural Networks

Dunli Zhang — Tue, 10 Sep 2024 00:00:00 +0800

In response to the multiple and ambiguous faults characteristic of starter motor testers, a fault diagnosis expert system based on fuzzy neural networks has been proposed. This design leverages the strengths of neural networks, fuzzy control, and expert systems. Neural networks diagnose faults in testing equipment, while fuzzy membership functions represent the degree of these faults. The system offers fast inference speed and strong fault tolerance. A control program was developed using Matlab, featuring a new user-friendly human-machine interface to enhance usability and operational ease of the system.

Effects of aging and thread rolling process sequence on tensile-tensile fatigue of GH4169 alloy bolt

Guanghui Liu, Hongxing Sun, Dan Liu, Le Liu, Xiaojun Sun, Hua Liu — Sat, 14 Sep 2024 00:00:00 +0800

GH4169 superalloy has excellent corrosion resistance, high temperature strength, good machinability and high temperature stability.Therefore, GH4169 was widely used in the manufacturing field of aviation equipment components. In this paper, GH4169 was used as the research material to analyze the effects of aging treatment and thread rolling process sequence on metallographic structure, thread morphology, tension-tension fatigue life and fracture morphology. The results showed that the manufacturing process of aging treatment before thread rolling process can reduce the grain size of the material and have good thread morphology, and its tension-tension fatigue life is higher than that of aging treatment after thread rolling process. And there were obvious differences in fracture morphology.

Study on Spectral Hole Burning Effect in Super-C Band EDFA

Hongxuan Wen, Xianhong Zhao — Sat, 14 Sep 2024 00:00:00 +0800

Erbium-doped fiber amplifiers (EDFAs) are a key component in optical communication networks, but they suffer from the significant issue of spectral hole burning (SHB). This paper conducts three sets of comparative experiments by controlling the signal power, signal wavelength, and channel bandwidth of the EDFA to delve deeper into the factors influencing SHB. Additionally, the feasibility of compensating for SHB using iSHB has been experimentally verified.

Optimization of Link Failure Detection Models Integrating Link Importance Assessment and Community Division

Xiaoxiao Wu, DR. MUHAMMAD NUR FIRDAUS BIN SAHRAN — Sat, 14 Sep 2024 00:00:00 +0800

This study introduces an efficient link failure detection model to enhance network operation and service quality by addressing current methods' limitations like high resource use and narrow monitoring scope. The model integrates a dual-layer structure using link importance assessment and community partition algorithms, complemented by fault identification algorithms based on time series analysis and machine learning, such as autoregressive models and support vector machines. Tested in simulated environments, the model achieves up to 98% accuracy, with fault response times reduced to 20 seconds and recovery times to 40 seconds, showing particular effectiveness in critical and high-bandwidth scenarios.

Research of Containment Leakage for Marine Nuclear Power Platform

Gang Ji, Xiru Wang, Mei Tan — Sat, 14 Sep 2024 00:00:00 +0800

The purpose of this paper is to clarify the overall and local leakage rates of the Marine reactor containment, establish the containment seal test acceptance criteria, and support the analysis of airborne radioactive material concentration in the compartments around the containment. Based on the containment seal test standard of onshore nuclear power plants, the leakage rate index allocation, leakage rate calculation and feasibility analysis of Marine Nuclear Power Platform (MNPP) were carried out through the general idea of "standard analysis-proposed index-verification index". The study showed that the overall leakage rate of the containment of the MNPP was proposed about 3‰/24h, and the leakage rate distribution of the penetration parts of Class B and C accounted for 10% and 50% of the overall leakage rate respectively under the condition of the design accident. During the sealing test phase, the overall leakage rate of the containment should consider 25% of the design margin. The results of numerical analysis and calculation of containment leakage of the MNPP meet the requirements of index and have a good design margin, which is of great reference value for the establishment of containment sealing test acceptance criteria.

Analysis on decoupling effect of transportation carbon emissions in Inner Mongolia, China

Xiaoyan Liu — Sat, 14 Sep 2024 00:00:00 +0800

Transportation plays a pivotal role in social and economic development, and economic growth has a significant driving effect on transportation carbon emissions. It is particularly important to explore the relationship between economic growth and transportation carbon emissions. Based on the 2006-2021 time series data of transportation energy consumption in Inner Mongolia, this paper uses the IPCC "top-down" calculation method to calculate the total carbon emissions of transportation, and selects per capita GDP and added value of transportation industry to represent economic growth. Through the stationary test of time series data, the construction of Tapio decoupling model, the calculation of decoupling elasticity coefficient, and the decoupling effect analysis, the decoupling state between economic growth and transportation carbon emissions in different time periods during the study period was obtained, and the decoupling effect of transportation carbon emissions in Inner Mongolia was explored, providing theoretical support for energy conservation and emission reduction of transportation.

Road Passing Analysis and Test Study of Semi-trailer Traction Train

Xiaofei Hua — Sat, 14 Sep 2024 00:00:00 +0800

Taking the low-plate semi-trailer as the research object, the calculation model of road passability is established, and the two parameters of the minimum turning diameter and turning channel width are analyzed based on the analytical method. According to the requirements of GB1589-2016 vehicle channel circle and the test method for the limit and measurement method of the vehicle turning channel circle diameter, and the circle and external pendulum value of the turning channel of a semi-trailer tractor are studied. Firstly, the low flat semi-trailer is established as the research object; secondly, according to the circle and the test method of the national standard, the comparison test is carried out to verify the correctness of the analytical analysis, the calculation result and the test error are very small, the model is credible, and the performance of the vehicle road meets the use requirements.

The characteristics of linear filament system is studied based on Incomplete statistics

Yaya Li, Xiaochun Yong — Sat, 14 Sep 2024 00:00:00 +0800

Non-extensive statistical mechanics has shown its superiority in explaining the singular phenomena of complex physical ensembles, and Incomplete statistics is one of the methods. The idea of Incomplete statistics was used, the E-V distribution of Shannon entropy is derived and applied to the linear filament system to simulate the E-T-q image. The results show that the thermodynamic properties under different q values are different from the traditional statistical results, which provides a theoretical basis for explaining the phenomena of real complex physical systems.

Zinquinone hybrid for the anode of drainage potassium ion battery

Bin Tang, Wei Shao, Yan Wang, Mengwei Yang, Qinggang He — Sat, 14 Sep 2024 00:00:00 +0800

Based on the development of energy materials, phenazine (PNZ) and its analogues were selected as the development target, and the high purity TAPQ was obtained through actual synthesis. The resulting TAPQ was applied to strong alkaline conditions (6 M KOH). Through actual assembly and debugging, and cyclic voltammetric test, it was found that the specific capacity was 370 mAh g^-1 at the current capacity of 0.1 A g^-1, and the ratio ratio was still maintained 100%. Meanwhile, the redox reaction of TAPQ was found to be step by step with high reversibility. At the same time, the full cell cycle voltammogram shows that TAPQ has good cycle stability in actual operation. Based on the performance results of the detection and the comparative analysis of the current data, the practical application of TAPQ provides a new idea for exploring new organic electrode materials.

Study on the Influencing Factors of Insulation Failure on Surface of PCB in Switching Power Supply

Lingqi Guo, Chuang Zhang, Shuo Zhang, Xinlu Li, Shengtao Li, Na Liu — Sat, 14 Sep 2024 00:00:00 +0800

The miniaturisation and high-power density of switching power supplies encountered internal insulation problems where the printed circuit board (PCB) should be considered carefully. In order to investigate the influencing factors of insulation failure on the surface of PCB in switching power supplies, this paper explores the surface flashover conditions of PCBs by varying the distance between the electrodes, the air pressure, and the external environment. The results showed that the distance between the electrodes and the structure of the electrodes significantly affect the electric field distribution and the surface flashover voltage. Besides, the surface flashover voltage under varied air pressure approximately conforms to the general law of the Paschen’s curve, that is, the surface flashover voltage decreases and then increases with the the air pressure increasing. Additionally, it is indicated that the more complex the surface environment of the PCB is, the lower the corona voltage is.

Inference Method for Traffic Accident in Highway Monitoring Blind Based on Running Speed

Yan Cui, Xingtao Yang, Sibo Zhang, Haiyun Zou — Sat, 14 Sep 2024 00:00:00 +0800

This study proposes and validates an inference method to detect abnormal traffic events in highway monitoring blind spots by analyzing vehicle speed data from adjacent monitoring areas. Utilizing simulation tools such as Vissim and LumenRT, various realistic traffic scenarios were designed to collect comprehensive data on vehicle speeds. Cross-correlation and Pearson correlation coefficients were employed to identify time lags and quantify the relationship between speeds in different sections. The results indicated a significant correlation under normal conditions and a marked decrease during abnormal events. This method provides a reliable approach to enhancing the detection of traffic anomalies, improving highway safety and efficiency. The implications of this research suggest that integrating such methods into existing traffic management systems can offer a more comprehensive surveillance framework, with potential for future enhancements through real-world validation and the inclusion of additional variables.

A highway classification method based on floating cars and Moran's index

Jin He, Yiyong Zhang, Shencheng Yang, Xiaoyu Xu, Shaopeng Li — Sat, 14 Sep 2024 00:00:00 +0800

To align with the essential demands of expressway operational and maintenance management in the contemporary era, this paper advocates refining the monitoring standards for distinct highway segments and enhancing the operational efficiency of the expressway monitoring system. It introduces the concept of stability in traffic conditions, particularly focusing on overtaking frequency, speed differentials, and traffic fluctuations at entry and exit points. Furthermore, by employing entropy method and global Moran index, the paper establishes a grading detection approach for expressways, thereby laying a solid foundation for optimizing monitoring strategies and bolstering road safety.

All-fiber curvature sensor based on asymmetric structure

Fan Yang, Lijun Li, Qianqian Cui, Nuo Cheng, Hongyuan Zhang, Mengge Xue — Sat, 14 Sep 2024 00:00:00 +0800

In this paper, an asymmetrically structured curvature sensor fabricated as a biased core fusion bonding, which consists of a PDMS elastomeric material encapsulating an all-fiber Mach-Zehnder interferometer, is proposed to solve the problem of identifying vector bending and twisting. The curvature in the range of 0.2cm-1~0.67cm-1 was realized to recognize the bending direction of the Y-axis and Z-axis in the positive and negative four directions, and the twisting direction of clockwise/counterclockwise in the twisting range of 0-10°. Meanwhile, four repetitive experiments on the repeatability of the sensor were carried out in a constant temperature environment, and the sensitivity error was less than 0.211%. The designed flexible sensor has good linearity and repeatability.It has the advantages of small size,no electromagnetic interference and high sensitivity, which can be applied in the fields of robot intelligent skin and motion monitoring.

Layout and Target Estimation Method of Sheltered Area for Multipath Signal

Can Dong, Wenyin Song, Haibin Li — Sat, 14 Sep 2024 00:00:00 +0800

Building environment sensing and shelter target detection technology based on low frequency electromagnetic wave has attracted the attention of researchers around the world. Low frequency electromagnetic wave has good penetration and low loss characteristics, which can realize building structure layout imaging and shelter target detection and tracking, and has important application prospects in the fields of anti-terrorism and stability maintenance, disaster relief and urban mapping. Due to the occlusion of urban buildings, electromagnetic wave propagation will produce complex electromagnetic phenomena such as reflection, transmission and diffraction, resulting in imaging defocusing and unstable target detection and tracking. This paper proposes a reconstruction method of building layout based on the combination of transmitted and reflected signals. Through the result level fusion of reflected projection images and transmission tomography images, the problems of wall position deviation and serious artifact interference existing in the reconstruction process are solved, and efficient and high-precision imaging of building layout under limited scanning paths is realized. The research on building layout and target imaging methods for multipath signals conducted in this paper can not only improve the detection performance of radar equipment in urban buildings, but also be applied to reconnaissance and surveillance in non-line-of-sight areas such as street corners, providing reliable information for anti-terrorism, stability maintenance and automatic driving, and playing an important role in national defense and social applications.

Research on Ecological Protection and Restoration Technology of Fushun West Open pit Mine in Liaoning Province

Ping Xiao, Xu Yan, Xuefeng Wang, Ying Deng, Shaoming Xie, Lei Sun, Ye Xing — Sat, 14 Sep 2024 00:00:00 +0800

This article takes Fushun West Open pit Mine as the research subject, and focuses on the issues of land damage, dust and sand raising, water level reduction, soil desertification, and vegetation degradation caused by mining. It conducts in-depth research on ecological environmental protection and restoration technologies.This paper first comprehensively analyzes the characteristics of Fushun West Open pit Mine and the impact of mining activities on ecology through literature research and case analysis. It reveals the transmission mechanism of rock and soil damage ecological degradation in the open-pit mine, reconstructs the ecological self-sustaining system, and further conducts research on key technologies such as land leveling technology, soil reconstruction and improvement restoration technology, and mine vegetation restoration. A technical framework suitable for ecological protection and restoration in the West Open pit Mining Area is constructed, and corresponding restoration technologies and measures are proposed. The implementation of these technologies has significant implications for improving the ecological environment of mining areas and promoting sustainable development. I hope to provide reference for ecological restoration in similar mining areas.

Research on effect of the water-based permeable crystalline material on concrete durability

Jiakun Zhang, Xiji Li, Kandi Yang — Sat, 14 Sep 2024 00:00:00 +0800

This study investigates the effect of the water-based permeable crystalline material on the compressive strength, permeability resistance, freeze-thaw resistance, abrasion resistance, and chloride ion permeability resistance of concrete through multiple sets of experiments. The results illustrate that the water-based permeable crystalline material enhances the compressive strength of concrete by approximately 9% and enhances the permeability resistance by 42.9%. Due to the notably higher permeability resistance, the chloride ion permeability resistance of concrete correspondingly increases by 17.2%. Moreover, this material significantly mitigates the damage caused by the freeze-thaw cycles and abrasion, making concrete more suitable for various working environments.

Judge The Function of Rules In The Power Grid Emergency Command System

Ming Ni, Huan Liu, Wei Zhang, Buchao Wang, Rui Kang, Jun Wang, Yitian Liu — Mon, 30 Sep 2024 00:00:00 +0800

The research and judgment rules are the core of the research and judgment function. The research and judgment function will strengthen the construction of the emergency technical support capabilities of the power grid company, break the data barriers, strengthen the interconnection and resource sharing of integration, and realize information. Intelligent, digitalization, effectively improve the level of response to emergencies, and promote the modernization of the company's emergency management system and emergency capacity, some have a significant role.

A Study on the relationship between Landscape Elements, Landscape Preferences and Health Benefits in Urban Parks

Yu Wen, Yulan Li, Bingbing Liu, Tao Long, Jianyu Hu — Mon, 30 Sep 2024 00:00:00 +0800

Public health and well-being are closely linked to the quality of the human landscape environment. As a vehicle for studying human-landscape interactions, landscape preferences are closely linked to landscape resilience. Numerous studies have shown that individuals exhibit different preferences for different environments, with more preferred environments producing greater health benefits. Natural environments are also subject to differences in individual preferences and offer greater health benefits than urban environments. To investigate the relationship between landscape elements, landscape preferences, health benefits and their influence mechanisms, an influence pathway and evaluation model was constructed for this study between these three variables, using the South Lake Urban Central Ecological Park in Tangshan, China as the research object and social media network evaluation as the data source. Quantitative and qualitative analyses were used to extract landscape element measures, in combination with existing landscape preference and health benefit assessment scales. Field research was conducted to obtain evaluation data, and a structural relationship model was constructed for validation to examine the interactions between landscape elements, landscape preferences, and health benefits. The results showed that landscape elements had a significant positive effect on landscape preferences (β is 0.699, t=8.375, P<0.001); landscape preferences also had a significant positive effect on health benefits (β is 0.643, t=6.526, P<0.001); landscape elements also had a significant positive effect on health benefits (β is 0.42, t=2.816, P< 0.01), while landscape elements had an indirect effect through partial mediation of landscape preferences. In the landscape element measurement model, each latent variable can effectively explain landscape elements, but the explanation ability of each latent variable for landscape elements varies, indicating that different landscape elements have different effects on landscape preferences; in the landscape preference measurement model, the four measurement dimensions can effectively explain landscape preferences, among which consistency has the highest explanation ability for landscape preferences; in the health benefits assessment measurement model, all four measurement dimensions effectively captured the health benefits assessment, eliminating fatigue has the highest explanatory power for the health benefits assessment. From the final structural equation model, it can be seen that landscape elements have a significant effect on both landscape preferences and health benefits, and landscape preferences also has a significant effect on health benefits. Visitors moved from landscape element evaluation to landscape preferences and finally to health benefits assessment, which is a sequential experience.

Optimizating Sporadic Data Transmission for mMTC in 5G Networks

Qingguo Shen, Fan Luo, Ruiqi Qiu, Zulei Hou — Mon, 30 Sep 2024 00:00:00 +0800

In response to the explosive growth of massive Machine-Type Communication (mMTC) terminals in 5G networks, this paper proposes an optimization method for sporadic mMTC data transmission in 5G based on grant-free radio bearers. This method achieves efficient access and resource sharing among mMTC terminals through sharing pre-configured radio bearers. Additionally, an uplink grant-free random access mechanism is introduced to ensure that terminals are only activated for necessary data transmissions, then automatically entering a low-power sleep state. By optimizing the design of the air interface protocol stack, transmission delay and operating cost of the system are significantly reduced, and data transmission efficiency is further improved. The paper also explores the application of this method in satellite networks, demonstrating in detail its capacity to substantially reduce signaling overhead and enhance network performance for mMTC data transmission. This method has broad application prospects in 5G and satellite communication networks.

Model experiment on the treatment effect of concrete cover plate for karst developed roadbed

Xiong Yang, Ze Liu, Qingxi Yi, Keyou Shi — Mon, 30 Sep 2024 00:00:00 +0800

In order to explore the treatment effect of concrete cover plates on karst roadbeds under karst development conditions, two comparative analysis models of karst roadbeds without prevention measures and with concrete cover plates were designed. The instability and failure laws of karst roadbeds under development conditions and the control effect of concrete cover plates on karst roadbed settlement were studied. Research has shown that the maximum displacement of karst roadbeds occurs at the top of the karst cave. With the continuous development of the karst cave, the displacement at the top of the cave increases, leading to settlement deformation of the roadbed surface and ultimately resulting in roadbed collapse; During the development of karst caves, the vertical soil pressure of the roadbed at positions 0cm and 10cm from the centerline decreases with the increase of cave span, while the vertical soil pressure of the roadbed at positions 20cm and 30cm from the centerline increases with the increase of cave span; Even with the continuous development of karst caves, the karst treatment effect of concrete cover plates is still very obvious.

Numerical simulation study of impingement atomization of kerosene propellant

Jiahui Zhong, Xinjun Zhao, Xinyan Wang, Shunhua Yin, Jin Chai, Guang Xian — Mon, 30 Sep 2024 00:00:00 +0800

In order to analyse the mechanism of impinging atomization and improve the effect of kerosene propellant atomization, numerical simulation of two-nozzle impinging kerosene atomization is carried out by Discrete Particle Model (DPM) in the Eulerian-Lagrangian framework, which is used to build a two- nozzle impinging kerosene propellant atomization model and to study the effects of the initial impinging angle and the jet velocity on the atomization characteristics. The results show that: with the increase of the impact angle, the forward impact area of the two jets increases, resulting in more energy loss of the jet due to collision, and the droplet velocity decreases so that the conical atomization field devel-ops slower; the spreading range of the atomization field is related to the impact angle, when the initial impact angle is in-creased from 45° to 60°, the spray cone angle and the atomization range angle increase a respective 48.57% and 20.68%; The Sauter mean diameter (SMD) of the atomized droplet gradually decreases with an increase in the impinging jet velocity, under the same initial impinging angle.

The pilot study investigates the degradation of pollutants in a river within Jinan City using a three-dimensional ecosystem

Guangjing Zhou, Wenqiang Jiang, Hao Liu — Mon, 30 Sep 2024 00:00:00 +0800

Ammonia nitrogen pollution in rivers is increasing day by day, and the use of plants to remove ammonia nitrogen from water bodies in large-volume sewage is a more common method.However, there are many problems in ecological methods such as traditional constructed wetlands.Therefore, the results of pilot experiments in this paper show that (1) the spatial intensification of the system: Combined with multi-level artificial ecological technology and three-dimensional hydroponic technology, a three-dimensional artificial ecosystem is constructed to maximize the use of vertical space, increase the system space and hydraulic residence time, reduce the area of more than 75% compared with traditional ecological wetlands, and exert efficient pollutant reduction ability in a small area.(2) High nitrogen removal efficiency of the system: The introduction of plant root zone microbial culture and domestication technology in the process of ecological plant culture can improve the nitrogen removal capacity of the three-dimensional ecosystem, and the ammonia nitrogen degradation rate can reach up to 96%, stably reaching the surface water environmental quality standard (GB 3838-2002) Class IV water quality.(3) To achieve low temperature and stable operation in the northern winter: Capping photovoltaic glass greenhouses outside the three-dimensional ecosystem to ensure the operating temperature of the ecosystem in autumn and winter, ensuring that the system can maintain a high water temperature at night in winter, and promoting microbial nitrogen removal and plant growth.④ Ecological and economic value: The solar photovoltaic system is set on the greenhouse, and the solar photovoltaic technology is used to provide electricity for the ecosystem.The effluent treated by the system is used for the water of flowers and plants in the system.The labor cost and equipment maintenance cost during the operation of the system are compensated by the income from the sale of flowers.To achieve the long-term operation mechanism of "green and efficient, low-carbon cycle, intelligent ecology" of the ecosystem, to ensure the sustainable and stable operation of the treatment system, and the ecological economic value is high.

Power grid fault comprehensive analysis model and monitoring method

Xinbo Guo, Liqing Shi, Rui Kang, Jun Wang, Yitian Liu — Mon, 30 Sep 2024 00:00:00 +0800

This paper proposes a fault prediction method based on disaster meteorology and real-time monitoring of power grid faults, to provide important data support for early warning and emergency start and on-site emergency repair of power grid companies. When there is ice, wildfire, flood, typhoon and other disasters, the probability of power grid failure will greatly increase. Through the previous historical data analysis, predict the scale of power grid failure and main areas, so as to prepare corresponding materials and personnel. When disaster weather occurs, monitor all kinds of power grid fault signals in real time, conduct power grid fault analysis, real-time analysis of power grid fault and the affected lines, transformers, communities, users and other data, grasp the latest state of power grid fault, and then provide important data support for emergency rescue.

Research on intelligent interpretation of covering measures of dense mesh net based on UAV remote sensing images

Ying Zhang, Zhibin Li, Rongrong Tan, Yang Li — Mon, 30 Sep 2024 00:00:00 +0800

In order to explore the method of intelligent interpretation of typical measures of environmental protection and water conservation in pumped storage power station by UAV remote sensing technology, Wei Fang of pumped storage power station in North China was selected as the research area and the measure of dense mesh covering was selected for intelligent interpretation study. Firstly, a sample database of typical measures of dense mesh cover was built based on the orthophoto image of the UAV. Then the dense mesh cover recognition model is constructed using ENVI deep learning model framework. At last, the loss, accuracy and recall rate indicators provided by the ENVI deep learning module TensorBoard is usd to evaluate the accuracy of the recognition of model, which the accuracy reaches to 93%.

Application of situational simulation pedagogy in a basic course in specialized rehabilitation nursing

Yixin Lu, Jing Tang, Lingjuan Niu, Nan Zhao — Mon, 30 Sep 2024 00:00:00 +0800

Objective To explore the influence of situational simulation teaching method on enhancing the humanistic care ability of nursing specialist students in the basic course of rehabilitation nursing. Methods A total of 80 nursing students in 2 classes of 3-year specialized nursing program 2022 in our school were selected as the research object, all of them were in 3-year system, and were divided into 40 in observation group and 40 in control group by whole cluster random sampling. The control group used the traditional teaching method to carry out the teaching of the basic course of rehabilitation nursing, and the observation group used the situational simulation teaching method. Compare the two groups of nursing students' learning achievement, nursing students' humanistic caring ability, and objective structured clinical examination OSCE examination score. Results After teaching, the total score of the observation group's learning achievement was 161.01±3.17, the total score of nursing students' humanistic caring ability was (200.13±2.13), and the score of the objective structured clinical examination OSCE examination was (96.68±3.17), which were higher than those of the control group. The differences were statistically significant. Conclusion Compared with the traditional teaching method, the situational simulation teaching method can effectively improve students' academic performance, clinical examination OSCE examination scores and enhance nursing students' humanistic care ability.