bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Impact of the “The Belt and Road” on the Development of Open Economy in the Central and Western Regions ——Empirical Analysis Based on Differences-in-Differences
Authors: Wang Yaxian
Published: December 2023

“The Belt and Road” (B&R) has made the mid-west region the frontier of opening to the outside. Based on the sample data from 51 cities from 2005 to 2019, the paper studies the policy effects of B&R on the open economy in the mid-west region by utilizing a difference-in-differences model. Also, building upon the index of level of infrastructure development, the paper analyzes the specific mechanism of this policy effect. The research results show that: B&R has elevated the level of opening-up in the mid-west region, as reflected in a significant increase in the regions’ foreign trade dependence and foreign investment reliance since the initiative was launched; further research reveals that B&R has a greater stimulating impact on promoting foreign trade in the mid-west region compared to attracting foreign investment while factors such as location and business environment have affected the policy effect of B&R to some extent. In terms of its mechanism of action, B&R has improved the transport facilitation and communication facilitation in the mid-west region, thereby promoting the development of its open economy. The research holds valuable insights for guiding China in the acceleration of the western region development through B&R, and the achievement of the high-quality opening economy development in the mid-west region.
Design and development trend of hotel management system based on Web technology
Authors: Liu Xiaohan , Lu Wenqin
Published: December 2023

In the rapid development of modern society, how to build and promote the integration of guest rooms, catering, business culture and other various service facilities for the consumption of places, is the main issue that the domestic and foreign hotel industry actively explore. Nowadays, China's hotels have a large organization, provide more service items, and collect a large amount of information. In order to further improve the level of labor production, control costs, and improve service quality, it is necessary to achieve information management and control with the help of computers. Therefore, after understanding the current research status and development trend of hotel management system, this paper mainly studies the design of hotel management system based on Web technology according to system demand analysis and system function analysis, and puts forward effective measures from the perspective of long-term development of the industry.
A New Kind of Anti-bending and Anti-deformation Cathode Frame for Electrostatic Precipitators
Authors: Zeng Jingsong , Zeng Yuhan , Wang Ziwei
Published: December 2023

The present invention discloses a cathode frame of an electrostatic precipitator, comprising a rectangular frame composed of four horizontal bars and five vertical bars; The horizontal and vertical bars are perpendicular to each other and located in the same plane, and four horizontal bars are arranged parallel to each other, while five vertical bars are arranged parallel to each other; Four horizontal bars divide the longitudinal length of the rectangular box into three equal parts, five vertical bars divide the transverse length of the rectangular box into 2:1:1:2, and one of the vertical bars is located on the vertical centerline of the rectangular box; The upper section of the two outermost vertical rods on the rectangular frame is a reinforced vertical rod, and there are two horizontal through-holes on the reinforced vertical rod for installing the cathode frame support. The cathode frame of the electrostatic precipitator has a simple structure and convenient assembly, which can effectively prevent the cathode frame of the electrostatic precipitator from bending, deformation, or even sliding and collapsing from the overall cathode support, greatly improving the safety and stability of the operation of the electrostatic precipitator.
Study on the Similarity between Nonnegative Irreducible Matrices and Positive Matrices
Authors: Zhang Hao
Published: December 2023

The main objective of this study is to explore the problem of similarity between nonnegative irreducible matrices and positive matrices. By leveraging established lemmas and drawing insights from pertinent literature, this article provides a rigorous proof: When  is greater than 8, for any  nonnegative irreducible matrix , if it contains  zero elements and possesses mutually distinct diagonal elements, then  is similar to a positive matrix.
Spatial variability characteristics and source analysis of heavy metals in soils of the Daxia River basin
Authors: Wang Shengwei , Wen Yongqin , Wang Haizhen , Yuan Zhongjie
Published: December 2023

In order to understand the influence of heavy metals on the surrounding environment in the Daxia River basin and provide a scientific basis for environmental pollution prevention and control, 30 heavy metal samples were collected and the contents of five heavy metals, As, Cd, Cr, Cu and Pb, were detected. The contribution rates of As and Cr were 98.36% and 56.14%, respectively, which were mainly influenced by agricultural activities; the contribution rates of Cu and Pb were 42.28% and 89.80%, respectively, which were more influenced by traffic factors; and the contribution rate of Cd was 35.50%, which was influenced by industrial activities. industrial activities, the estimated probabilities indicate a risk of heavy metal pollution in the northeastern part of the study area in the Daxia River basin.
Experimental research on mechanical properties and elastic modulus of glass fiber reinforced concrete
Authors: Tang Yanzhi , Duan Xiaofang
Published: December 2023

By adding ordinary glass fiber and alkali resistant glass fiber into concrete, the development of axial compressive strength, axial tensile strength and elastic modulus of concrete are studied. The results show that with the increase of glass fiber, the axial compressive strength increases first and then decreases; the axial tensile strength increases; the elastic modulus decreases. The results show that glass fiber can improve the strength of concrete, and reduce the elastic modulus.
Isolation and characterization of Streptococcus suis from pig farms in Sichuan
Authors: Liu Siyuan , Liu Tianshan
Published: December 2023

In this experiment, bacteria were isolated by aseptically collecting tissue samples of heart, spleen, liver, lymph node, and joint fluid from diseased and dead pigs, and were identified by colony morphology observation, Gram staining microscopy, biochemical experiments, PCR identification, pathogenicity test, and drug sensitivity test. The results showed that the isolated strains were Gram-positive, long-chained, or bipartite coccoid bacteria. It could ferment most sugars, and the VP test and indigo substrate test were negative, consistent with the physiological characteristics of Streptococcus suis. The PCR method was used to identify the serotypes, and about 500 bp of podocarp serotype 9-specific bands could be amplified. Pathogenicity test showed that mice became depressed 6h after intraperitoneal inoculation with the isolate, and died within 24h after rapid breathing, slow movement, and loss of appetite. The results of the drug sensitivity test showed that the isolate was highly sensitive to cefthiophene, florfenicol, cefadroxil, ciprofloxacin, ampicillin, amoxicillin, highly sensitive to sulfisoxazole, polymyxin B, enrofloxacin, doxycycline, and showed resistance to lincomycin, kanamycin, neomycin, gentamicin.
Effect of pulse injection on proppant distribution in fracture
Authors: Bai Zhifeng , Li Mingzhong
Published: December 2023

The trend of changes in proppant concentration and fracture conductivity is essentially identical. When combined with an analysis of the average conductivity of effectively propped fractures at different locations, it becomes evident that the proppant distribution pattern becomes uneven after pulse injection. However, this pattern displays a discontinuous distribution law on the macro level. Influenced by the proppant distribution pattern, fracture conductivity exhibits significant variation at different locations. During the conventional injection process, the conductivity of fractures near the wellbore gradually decreases from proximity to distance. Conversely, the proppant phase distribution during pulse injection induces fluctuation in fracture conductivity, transitioning from proximity to distance.
Effects of Functional Materials and Fertilizer Application on the Growth and Physiological Indicators of Pearl Apricot
Authors: Chen Junxi , Lin Xiangjie , Zhang Guangna , Lei Guihua
Published: December 2023

In order to study the effects of different amount of functional materials (FM) on pearl oil apricot, the study set up 0 g (control), 50 g (FM50), 200 g (FM200) and 300 g (FM300) of functional materials, and mixed with 2 kg of compound fertilizer as the base fertilizer. The growth and physiological indexes of pearl oil apricot and soil physicochemical properties were measured. Results showed that FM treatment significantly improved the pollen viability especially under FM300 treatment. FM200 and FM300 treatments significantly improved leaf carotenoids, anther size and anther quality of 100 seeds compared with the control. The anther width was significantly increased by 0.13 mm at FM300. However, physiological indexes such as filament length, anther length, pistil development type, hundred leaves length, hundred leaves width, hundred leaves thickness, hundred leaves weight and pollen fullness were not affected by FM. It can be seen that FM had a greater effect on growth and physiology indicators of pearl oil apricot, while the effect on soil physicochemical properties was smaller.
Study on Soil Heavy Metal Pollution on Both Sides of Jiyin Avenue in Nanjing
Authors: Cao Jingjing , Min Chaochao
Published: December 2023

More than 30 soil samples were collected from the two sides of Jiyin road in Nanjing, and the contents of  Pb, Cd, Cu and Zn were determined. The evaluation results of single pollution index show that the content of Cu on both sides of Jiyin road exceeds the standard. Except that the content of Zn at 150m in the south of the road, the content of other Zn has exceeded the standard  The content of Pb and Cr on both sides of the road does not exceed the standard. The Nemerow comprehensive pollution index of each region is more than 1 and less than 2, which belongs to the range of light pollution.
Construction of Testing Standards System for Comprehensive Utilization of Bulk Industrial Solid Waste
Authors: Wang Xiuteng , Liu Jing , Lin Ling , Gao Dongfeng , Huo Xiaodong , Xu Ling
Published: December 2023

According to the general steps of comprehensive utilization of each type of bulk industrial solid waste, including fly ash, coal gangue, tailings, smelting slag, industrial by-product gypsum, and red mud, we construct the testing standards system for comprehensive utilization of bulk industrial solid waste in China. The standards system, according to the lifecycle stage of "raw materials - pre-treatment - processing - forming products - using products", can be divided into 5 standard subsystems, namely a subsystem of physical property testing standards for raw materials, a subsystem of chemical property testing standards, a subsystem of process testing standards, a subsystem of the product quality performance testing standards and a subsystem of the environmental impact testing standards. The standards system provide top-level guidance for the implementation and development of comprehensive utilization testing methods for bulk industrial solid waste.
Research on environmental protection and water and soil conservation technology of power grid engineering mechanized construction based on modular design
Authors: Tan Yakun , Li Guoyong , Tang Jianli , Peng Wenfeng , Wang Hai , Kong Jiayi , Yang Song , Zhou Yuan , Liu Hongyuan , Tang Dugui , Huang Wei , Huang Tao , Liu Qing , Yu Weiqing , Su Wei
Published: December 2023

In the construction and development of modern society, power grid engineering as an important content of urban construction and development and protection of residents' quality of life, in the face of the expanding scale of power grid investment, power grid project construction shows a rapid growth trend. With the continuous development of social economy and smart grid construction needs, the requirements of power grid construction quality and construction period are getting higher and higher. On the basis of understanding the research status of mechanized construction of power engineering, this paper mainly discusses the principle and structure of modular design by taking the actual soil and water conservation measures on site as an example, and then takes the mechanized construction of power engineering in a certain area as an example to determine the construction environmental protection technology, in order to improve the comprehensive level of China's power grid construction.
Review on remanufacturability evaluation of retired products
Authors: Wang Jia , Cai Zhihai , Yao Jukun , Xu Dan , Shi Mengjia , Sun Jia
Published: December 2023

The uncertainty of recycling waste products affects the remanufacturing of products. Therefore, whether waste products can be remanufactured has become a key issue. Remanufacturability evaluation is an important part of the remanufacturing process of waste products, which directly determines the service safety and reliability of remanufactured products. Based on the research and review of a large number of literatures, this paper studies the current research hotspots and main research achievements of remanufacturing evaluation, and summarizes the existing achievements from the aspects of evaluation objects, evaluation directions and evaluation methods. Through research, it is found that most of the remanufacturability currently selects economic, technical, environmental and other evaluation grades, constructs corresponding evaluation index system, assigns weight to each index, and finally obtains evaluation conclusions through hierarchical analysis and entropy method.
The Construction of Social Cooperation System and Its Application in the Location Selection of Tourism Equipment Manufacturing Base under Mobile Internet
Authors: Sun Jianzhu
Published: December 2023

To study the application of social collaboration system in Tourism Equipment Manufacturing base selection under mobile Internet, firstly, Spring MVC framework and Activiti workflow engine technology are adopted to analyze the requirements of base location selection system based on the design idea and implementation method of mobile Internet base location selection system. Then the base site selection system based on social collaboration system is designed. Finally, the system is tested in user information management, site data management and site selection process management modules. The Activiti process framework can realize the business process modeling of the system, and can effectively help the site selection personnel to carry out site selection planning. At the same time, site selection personnel can carry out online interaction, facilitate site selection personnel to conduct on-site operations to obtain real-time data, and reduce workload and information errors, and improve the speed and quality of site selection under the design of mobile Internet. Therefore, the social cooperation model based on mobile Internet can reduce the cost of site selection and provide a basis for site selection.
Reflection-type 1-bit coding metasurface based on polarization conversion for broadband RCS reduction
Authors: Zhang Gaiping , Wang Aixia , Sui Sai
Published: December 2023

This paper proposed a 1-bit coding metasurface which based on polarization conversion for broadband RCS reduction. The coding metasurface were composed of digital ‘0’ and ‘1’ elements which formed by two semicircle structure and its mirror, respectively. The simulation confirmed that the unit cell can realize the polarization conversion; Moreover, the PCR was more than 90% at 7.7-18.3 GHz. Meanwhile, the phase difference of ‘0’ and ‘1’ element was exactly π at full band. So, the coding metasurface can scatter the energy of incident electric magnetic in all other directions, it successfully realized the RCS reduction.
Design and Verification of Urine Collection Hose Assembly Used for Environment Control and Life Support System
Authors: Zhang Rong , Cui Xiaohang , Li Haiou , Zhou Xiaolei , Su Huanhuan , Li Na , Li Ren , Liu Kun , Li Boyi , Mao Lei
Published: December 2023

The urine collection hose assembly is u sed in the urine collection subsystem of the environmental control and life support system (ECLSS) of the space station to connect the products or components in the urine collection subsystem and transmit the working medium. This paper introduces the design scheme and verification test of urine collection hose assembly. The urine collection hose adopts the design scheme of stainless steel wire armored polytetrafluoroethylene hose. Through the verification test, the results show that the scheme can meet the performance requirements of the space station toilet collection subsystem hose assembly.
Numerical Simulation Analysis of Construction Support of Intersection Section in Extra-long Water Diversion Project Tunnels
Authors: Li Juan , Zhu Jianwen , Ma Fei , Wang Kezhong
Published: December 2023

The selected Middle Yellow River Diversion Project is an important backbone project of the planning and construction of the modern water network in Shanxi Province. The project is composed of water source project and water transmission project, the water transmission project is about 400 kilometers long, there are about 200 kilometers of total dry, about 100 kilometers of East Dry and West Dry each, with an average depth of about 400 meters. The intersection section studied in this paper is located under the ridgeline of Lvliang Mountain with a burial depth of more than 600 meters. Whether to support the excavation of the tunnel intersection section was simulated by three-dimensional numerical simulation analysis of different sections. The stress field of surrounding rock and liner and the distribution of plastic zones in surrounding rock were simulated and calculated. The research results provide a technical reference for the design of tunnel support and the formulation of construction schemes, which is of great significance for the construction safety and operation management of water diversion tunnels.
Research on the Stability and Support Effect of Earth Section of Hydraulic Tunnel Based on FLAC 3D
Authors: Zhu Jianwen , Li Juan , Ma Fei , Wang Kezhong
Published: December 2023

The stress of the surrounding rock of hydraulic tunnel can produce a stress load on the lining body, which may cause the crack failure of the lining. The distribution and deformation characteristics play a key role in ensuring the long-term stability of tunnels. Therefore, an analysis of the distribution characteristic is of great significance. This paper takes the branch tunnel in the Yellow River Diversion Project of central Shanxi as an entity for modeling, and uses the finite difference program FLAC3D for analysis and calculation. The research results show that before the support is strengthened, the compressive stress of feet-lock bolts has exceeded the compressive strength of the bolts, with obvious stress concentration at the arch feet; the deformation mainly occurs on the vault and the bottom plate; after strengthening the support, the deformation of the steel arch prop, the axial force of the steel arch prop, and the maximum tensile stress of the anchor rods are all reduced. The stable support effect can meet the requirements of construction and later operation.
Sound Absorption Properties of An Open-Cell Ceramic with A High Occupancy Ratio for Recycling of Sediment from Taihu Lake
Authors: Chen Xiaojiang , Wang Ziyang , Rong Ningning , Min Hequn
Published: December 2023

This paper proposes an open-cell ceramic acoustic material to combat noise pollution, which utilizes sediment from Taihu Lake as its main ingredient. The open-cell ceramic is manufactured using the gel injection molding method to achieve a high occupancy ratio. Simulation and experimental research demonstrate that the open-cell ceramics possess excellent sound absorption properties, particularly in the middle and high frequencies, with high sound absorption characteristics. The unique pore structure of the open-cell ceramics provides multifunctional and excellent mechanical properties, resulting in a lightweight, pore-designable, and broad-frequency sound absorption material that is environmentally friendly, energy-efficient, and renewable.
The Effects of Mist Cannon Trucks on Human Health and Reducing Dust
Authors: Xu Yihan
Published: December 2023

More and more attention has been paid to dust removal by Mist Cannon Trucks (MCT). It is necessary to study the effect and influencing factors of dust removal by MCT. This study discusses the effectiveness and hazards of using MCT to reduce airborne dust by conducting lead testing, color identification, pH testing, and chlorine testing on collected samples. The results show that dust can be significantly reduced by MCT, and the effect of fog cannon decreases with the increase of distance. The MCT is currently safe for pedestrians because it has very few corrosive and toxic substances, and the lead content is also very low, which is below the safe value. At the same time, the sprayed water captured a lot of dust compared to the water in the tank. The main harm to the human body is the excessive lead content in water..
A review of the research progress of composite bipolar plates for proton exchange membrane fuel cells with different substrate materials
Authors: Zeng Yutian
Published: December 2023

As an important component in proton exchange membrane fuel cells, the performance of bipolar plates, such as electrical conductivity, bending strength, corrosion resistance, gas tightness, etc., directly determines the lifetime of fuel cells and their promotion applications. Composite bipolar plates have become a research hotspot and have been applied and promoted in related fields because of their strong design, flexible formulation, excellent performance, low cost, and applicability to various operating environments. This paper analyzes in detail the research progress of composite bipolar plates using different matrix materials, briefly analyzes and introduces the research on improving the performance of composite bipolar plates, and makes an outlook on the future development trend of composite bipolar plates for proton exchange membrane batteries.
Habitat Suitability Evaluation and Environmental Factor Identification for Spatial Distribution of Urban Birds: A Case Study of Hongshan District, Wuhan City, China
Authors: Yin Bidan , Chai Xingyu
Published: December 2023

The article takes 11 species of birds in Hongshan District as the research object based on the bird observation data 2020 and then identifies the spatial distribution of their habitats through the MaxEnt model. According to the results, we analyze the distribution characteristics and problems of bird habitats in Hongshan District and finally put forward the optimization suggestions according to the cohort groups. We conclude that water habitats and urban forest parks have higher suitability for bird spatial distribution and that the influence of various environmental factors on different types of birds is somewhat different. Based on the data analysis results, we provide references for the conservation of bird diversity and habitat restoration in Hongshan District: (1) Control the area of construction land and the number of high-rise buildings to make room for bird migration, enhance gene exchange among birds in different patches, and enrich species diversity. (2) Increase the number of bird migration “stations” between long-distance habitat patches to provide resting points for birds during long-distance migration. (3) Increase the number of bird migration "stations" between long-distance habitat patches to provide resting points for birds in the urban forest park. (4) Adopt tree-shrub-grass planting to provide more living space for birds. (5) Reserve a green corridor around urban roads and water systems to reduce the impact of urban roads on the distribution pattern of bird suitability.
Progress in the study of bipolar plates/conductive fillers
Authors: Ma Shuoyu
Published: December 2023

Proton exchange fuel cell (PEMFC) is an efficient, low-pollution and clean energy source that can directly convert chemical energy into electrical energy, and it has a broad application prospect in the future of on-board driving power supply, portable power supply and power station for home use. As one of the key components of PEMFC, the choice of material has a great influence on its performance. In order to find new materials for bipolar plates with excellent performance and low cost, this paper reviews the research progress of conductive filler/resin composite bipolar plates for PEMFCs, and summarizes the relevant properties of the current composite bipolar plates with different resins/different conductive fillers.
Advances in Nickel-cobalt Electrode Materials for Supercapacitors
Authors: Sun Linkun , Zhang Yuxuan
Published: December 2023

With the rapid development of society, supercapacitors have been widely studied in energy storage devices for their unique advantages of high energy density, good cycle stability, fast charge and discharge speed. However, the development of supercapacitors is limited by low energy density. To address this challenge, it is important to develop and prepare electrode materials with excellent electrochemical properties for supercapacitors. To improve the energy density of supercapacitors, nickel-cobalt electrode materials have been widely studied due to their advantages of high energy density, high safety and long life. In this review, the research progress in material morphology and microstructure of supercapacitors prepared from nickel-cobalt metal oxides/hydroxides, sulfides, selenides and phosphates in recent years is summarized and prospected.
Research on Advanced Treatment Technology of Fluorine Containing Wastewater from Graphite Production
Authors: Liu Yanli , Qiao Iyang , Ma Xiang , Zhao Zhilong , Liu Fengbiao , Shen Shifu
Published: December 2023

With the gradual improvement of environmental emission requirements in China, the graphite industry is facing environmental pressure from advanced treatment. This article first conducted a study on the current status of advanced treatment technology for fluorinated wastewater. Subsequently, a single defluorination agent experiment was conducted, and it was found that compared to several agents used in the experiment, such as PAC, PAFS, and CaCl2, PAC had the best defluorination effect. The optimization of PAC conditions showed that its optimal reaction pH was 7, and equilibrium could be achieved after 3 minutes of reaction. The study also conducted orthogonal experiments with mixed salts, and the best conditions for the combination of fluoride removal agents were found to be PAC adding 400 mg/L, CaCl2 adding 400 mg/L, PAFS adding 200 mg/L, which can remove fluoride to 0.92 mg/L, below 1 mg/L, meeting the Class III water standard in the " Environmental quality standards for surface water ".The SEM image of the sludge generated by the reaction between the composite fluoride removal agent and fluoride containing wastewater shows a larger particle size of up to 50 μm which is beneficial for the separation and removal of sludge. The generated sediment sludge is mainly composed of Al, Fe, Ca, O, and Si according to EDS results, and belongs to general industrial solid waste.
Synthesis of hydrogen-bond-enriched, fluorescent and triboelectric hyperbranched polymers via Michael addition reaction
Authors: Qiu Ziyi , Li Weiying
Published: December 2023

It is very meaningful to realize color recognition and mechanical-electrical energy conversion in one material simultaneously, which is very essential in improving the equipment of border guards. However, simultaneously endowing one material with color regonition and mechanical-electrical energy conversion presents challenges because they result from different mechanism. Herein, a series of hyperbranched polymers, HP9, HP10, and HP11, were synthesized via the Michael addition reaction to solve the dilemma. Extensive hydrogen bonding was embedded into these hyperbranched polymers, so that the polymers exhibit good triboelectrification ability. The voltage output is about 347 V, the current output is about 2.8 μA, and the charge quantity is about 150 nC, respectively. Moreover, the polymers display excellent fluorescence under 365 nm ultraviolet light based on the mechanism of aggregation-induced emission (AIE). Furthermore, the thermodynamic behavior and mechanical properties of the hyperbranched polymers can be regulated by adjusting the content of the hard segments. The Young's modulus and strength gradually increase with the increase of the hard segment unit. The Young’s modulus, strength and toughness of HP10 are 3.72 MPa, 2.69 MPa and 19.55 MJ/m3, respectively. The combination of fluorescence and frictional electrification will have great application potential in the equipment of border guards.
DDoS Attack Defense in Big Data-oriented Urban Rail Transit Safety Evaluation System
Authors: Ding Qi , Sun Lijian , Wang Xiaoyu
Published: December 2023

Big data technology is playing an increasingly important role in the safety evaluation of urban rail transit, which can help improve the safety and reliability of the transportation system. However, such a big data system will also become the target of attackers, especially in the face of DDoS attacks, its stability and availability may be greatly affected. Various attacks against the Internet have become a major concern among the many flaws of the contemporary Internet. Unfortunately, attacks against the Internet continue to grow more sophisticated, unpredictable, and unstoppable. At present, many researchers have devoted themselves to the research of DDoS defense solutions, and it is necessary to summarize the existing research on DDoS defense work and the technologies used in it. In this article, we introduce the process of DDoS attacks, and summarize the characteristics, mechanism and weaknesses of various DDoS attacks according to the network layer where the attack is located. Finally, defending against DDoS attacks is crucial to the big data-based urban rail transit security evaluation system. This paper summarizes the content of this paper and discusses some open issues in the field of network intrusion detection.
Railway Remote Sensing Image Segmentation Technology in Big Data-oriented Urban Rail Transit Safety Evaluation System
Authors: Ding Qi , Liu Song , Wang Jiantao
Published: December 2023

This paper discusses the application of satellite remote sensing images in urban rail transit safety evaluation. First of all, the article expounds the significance of satellite remote sensing images in the rail transit safety evaluation system, which can provide the overall information of the rail transit network, be used for traffic flow analysis, land use monitoring, etc., and provide a basis for planning decision-making. Then, the article introduces the application of artificial intelligence technology in the segmentation of railway remote sensing images. The deep learning model can realize automatic and efficient image segmentation and improve the segmentation accuracy. Then, the article designs a railway remote sensing image segmentation system based on PaddleSeg, and uses Google Earth remote sensing images for training and testing. Finally, the article analyzes the role of U-Net in the railway segmentation task, and the reflection of different evaluation indicators on the performance of the model. Research shows that artificial intelligence technology can greatly improve the segmentation efficiency and accuracy of railway remote sensing images, and provide strong support for rail transit safety evaluation.
Second phase strengthening mechanism of 2219 aluminum alloy
Authors: Lin Haiyan , Mao Xianchang , Lin Tugan , Wei Jun
Published: December 2023

Second phase particles have a decisive role in strengthening 2219 aluminum alloy, so it is important to study its strengthening mechanism. The different characteristics of the second phase particles of 2219 aluminum alloy were summarized, and the strengthening mechanism of deformable second phase particles (strain strengthening, chemical strengthening, order strengthening, modulus strengthening) and non-deformable second phase particles was analyzed. The strengthening mechanism model was established, the main application of the two particles was explained, and the guiding significance of the second phase particles on the coarse residual crystal phase breaking and the grain microstructure refinement of aluminum alloy was pointed out.
Raspberry Pi Based Smart Humidifier with Model Prediction
Authors: Xue Mengdong , Wu Hengyang
Published: December 2023

This work is based on Raspberry Pi and implements three main functions, namely temperature and humidity measurement, automatic switching on or off of the humidification module beyond the threshold, and anti-dry burning warning. The temperature and humidity sensor and pressure sensor receive the data and display it in real time on the serial port monitor. After the data is sent to the serial port, the WiFi module can transmit the data to the mobile phone application for remote real-time monitoring and surveillance. When the mobile phone detects insufficient water in the humidifier, it turns on the operation pump and pumps a fixed amount of water into the humidifier. At the same time, the data detected by the sensor is put into the deep learning model, and the predicted data is analysed to achieve the effect of pre-humidification and regulating the balance of environmental parameters.
Surface Electromyography in the Field of Human Factors and Ergonomic Muscle Fatigue: A Narrative Review
Authors: Fang Mingzhu , Kong Yue , Hu Jie
Published: December 2023

Recently Work-Related Musculoskeletal Disorders (WMSD) and Fatigue are taking on an important role especially in the progressive increase and tightening of the human-machine interface. Many ergonomists are currently using surface electromyographic (sEMG) signals techniques to investigate and assess muscle fatigue. Therefore, this paper provides a narrative review of current research on sEMG techniques in the field of human factors and ergonomic muscle fatigue.Evaluate and summarize studies related to the use of sEMG in human factors and ergonomics to probe muscle fatigue.Selected articles included publications in journals, books, and conference proceedings between 2012 and 2022 and assessed muscle activity in research using surface EMG techniques, intervention studies in real human subjects, quantitative research methods and evaluation tools, and authoritative study design.The final review included 32 articles and found that surface EMG studies in the field of human factors and ergonomic muscle fatigue mainly included risk assessment of work-related musculoskeletal disorders, workplace layout design assessment, usability assessment, and exoskeleton optimization assessment. Moreover, the current EMG experiments have significant variability in ideal and realistic conditions, and the lack of standardization of data and methods, which limits the development and application of EMG signals in human factors and ergonomic studies.The findings of this study can help ergonomists to understand the current research progress of sEMG techniques in this field in order to better select suitable, reliable, and accurate methods for human factors and ergonomic muscle fatigue assessment.
The enhancement of photocatalytic activity of porous g-C3N4@TiO2 nanotubes heterostructure
Authors: Zhao Shengzhe , Yang Yi , Chen Jinju
Published: December 2023

The g-C3N4 nanosheets were uniformly grown on TiO2 nanotubes with porous structure via the improved methods of impregnation calcination and facial vapor deposition. The photocatalytic performance of the g-C3N4/TiO2 nanotubes was evaluated by the degradation of methyl orange solution (MO) and exhibited higher photodegradation rate than the pure g-C3N4 or TiO2 nanotubes under xenon light irradiation, which may be attributed to the increased specific surface area and efficiently separation of photon-generated electrons/holes by the heterostructure. This work provides a simple and efficient scheme of manufacturing porous heterostructure nanotubes for environmental and energy applications.
An Optimized Control Strategy for Image-Based Visual Servoing Using Polar Coordinates
Authors: Li Liang , Luo Junqi , Zhang Zhenyu , Liu Jiyuan , Zhang Shanjun , Zhu Liucun
Published: December 2023

Image-based visual servoing is a crucial technique in robotic systems that enables accurate manipulation and control through visual feedback. In scenarios involving substantial rotational motion or changes in orientation, traditional Cartesian-based visual servoing methods may encounter limitations in terms of control performance. To address this challenge, we propose a novel approach that use coordinates for visual servoing control. By reparametrizing the control inputs in terms of polar radius and polar angle, our method offers a more intuitive and efficient way to handle rotations and angular variations. In addition, we further study the polar-based IBVS control by conducting experiments using a Proportional (P) controller as well as the Levenberg-Marquardt (LM) algorithm respectively, and the experimental results indicate that the proposed method demonstrates a faster convergence speed and better robustness.
Civil Aircraft Electrical System Development Using Model-Based System Engineering
Authors: Liu Xinhai , He Yifan , Zhang Shaojie
Published: December 2023

As one of the key systems of modern civil aircraft, Electrical System (ES) plays an important role in all flight phases of the aircraft. Considering the needs of the electrical system, based on the analysis of interaction process of civil Electrical System design and safety assessment, Doors and Rhapsody are used to accomplish the Requirement Analysis, Functional Analysis and Design Synthesis of electrical system in this paper. The use case model, function analysis model and verifiable state machine model of the electrical system are established to ensure the requirements are accomplished by system architecture. Finally, the interactive interface of panel diagram is developed to complete the simulation of the system model according to design requirements. The simulation shows that Model-Based Systems Engineering (MBSE) can greatly improve the efficiency and accuracy of the development of the electrical system.
Three-dimensional Electrocatalytic Degradation of Tetracycline by Nano-Feooh
Authors: Xu Qiang , Wang Yuexin , Zhou Yanming , Gong Yucai , Kong Dewen , Tang Shoufeng , Zhang Qingrui
Published: December 2023

Nano-FeOOH catalysts were prepared by a co-precipitation method and characterized by XRD, SEM, XPS and BET to analyze the phase composition, surface morphology, elemental composition and specific surface area of FeOOH. Results showed that the FeOOH catalyst had large pore volume and surface area, providing more active sites for catalytic reactions. A 3D electrocatalytic system EC/PS/FeOOH was established to degrade tetracycline (TC), and the contributions of FeOOH adsorption, PS activation and electrocatalysis were investigated. It was found that the adsorption rate of TC on sole FeOOH was 42%, the degradation rate of TC in the PS/FeOOH system was 63.80%, and the degradation rate of TC in the 3D EC/PS/FeOOH system reached 72.97%, indicating the high electrocatalytic activity of FeOOH. Surface catalysis mechanism studies showed that the high catalytic activity of FeOOH could be attributed to electron transfer between Fe(II) and Fe(III) and adsorbed oxygen on its surface.
Estimation of Left Ventricular Ejection Fraction Based on Swin_Uniform
Authors: Qi Dongsheng , Zhang Yanfen
Published: December 2023

A new left ventricular ejection index prediction method was proposed by introducing a block attention mechanism, which helps to reduce overfitting problems and improve the power of the model to process new different samples. Swin Transformer is a Transformer architecture that retains the modeling advantages of self attention mechanism. Its hierarchical design has both global and local modeling capabilities, and can output multi resolution feature maps, which is suitable for EchoCoTr's need to extract multi-scale information from time series medical images. Meanwhile, the resources required of Swin Transformer at runtime are linearly related to images to be processed, which reduces computational complexity and is suitable for processing high-resolution sequence images in EchoCoTr[1]. Swin Transformer has better results than Transformer in both classification and detection tasks, which just goes to show that it is somewhat of a great application in the field of vision. This is beneficial for EchoCoTr's understanding of cardiac ultrasound sequences. Therefore, in the original UniFormer model structure of the EchoCoTr[1] model, a new Swin Transformer Block is added. The new model has stronger modeling capabilities. This means that better results can be obtained under the same computing resources.
Research Progress On Identification Methods And Traceability Experimental Methods Of Oil Spills On The Sea
Authors: Wu Xuan
Published: December 2023

Oil spill composition is complex and difficult to identify. Traditional oil spill identification techniques include gas chromatography, infrared spectroscopy, liquid chromatography, fluorescence spectrometry, gas chromatography-mass spectrometry and nuclear magnetic resonance spectroscopy. Different methods of oil spill identification have their advantages and disadvantages. Oil spill identification is of guiding significance to the clean-up of oil spill at sea, liability disputes and the subsequent ecological restoration. In order to improve the persuasiveness and reliability of the identification results, it is necessary to combine different identification methods and develop a new oil spill identification technology. Based on the analysis of oil spill types, oil spill identification methods and relevant experimental facilities at home and abroad, it is necessary to carry out research on oil spill identification methods and traceability experiments, so as to provide a reliable basis for legal adjudication of oil spill accidents.
Drag Reduction Analysis of Optimal Three-dimensional Bumps on the M6 Wing
Authors: Gao Jianfeng
Published: December 2023

Based on Isight optimization software and evolutionary strategy algorithm, this paper builds a bump optimization design platform by integrating the three-dimensional bump shape generator program, grid generation software Gridgen and flow field simulation software Fluent. This platform is successfully validated on the RAE2822 supercritical infinite straight wing, which reduces the drag coefficient by 11 counts and increases the lift-drag ratio by 11.48 percent. Through this platform, the drag reduction characteristics of optimal three-dimensional bumps on the M6 wing are numerical studied. The results show that the three-dimensional bumps can weaken shock waves and have spanwise characteristics, the stronger the shock waves, the more obvious the drag reduction effect of the three-dimensional bumps, and the wing with optimal three-dimensional bumps can improve flow field characteristics and prevent flow separations.
Research on Adaptability of Temperature Characteristic for Electric Vehicle Power Battery
Authors: Zhang Yaxuan , Zhu Xiaofang , Zhu Xu
Published: December 2023

The operating temperature of power lithium-ion batteries in different application scenarios and working conditions not only relates to the economic cost and power performance of the energy system, but also directly affects its life. Therefore, based on the vehicle-mounted power battery, a comprehensive battery test platform was built to carry out charge and discharge tests, and the relationship between capacity and temperature was studied. In the temperature range of -30~50℃, a temperature gradient of 20℃ was used to obtain the charge/discharge curves at different temperatures, and the temperature characteristics of the power LFP batteries were analyzed in terms of charging and discharging.Based on data analysis, the conclusions of the study provide numerical references for the control of temperature thresholds for power battery applications.
The evolution trend and thinking of the modernization of command, control and communication system of American nuclear force
Authors: Zhou Yu , Peng Yongjun , Gong Wenquan
Published: December 2023

The nuclear force Command, Control and Communication System (NC3) is a variety of facilities required when the president issues nuclear operations instructions, is the central nervous system to achieve the United States "trinity" strategic nuclear strike, and is an important basis for achieving reliable and effective nuclear deterrence. The future contest between major powers is a comprehensive confrontation based on the comprehensive national strength of strategic nuclear forces. While the United States has the world's most advanced conventional combat forces and the largest nuclear Arsenal, it continues to apply new technological means to improve the operational command and control system of nuclear forces, upgrade its nuclear Arsenal, strengthen the construction and development of nuclear forces, and maintain its nuclear superiority. We should draw inspiration from this and speed up the independent research and development of a credible and reliable combat command system of nuclear forces to ensure that we will win the first opportunity in future wars.
Ultra-Short-term Electric Load Forecasting Based on VMD-BiLSTM Model
Authors: Chen Jiakun , Ma Wanxing , Chen Zhimin
Published: December 2023

Fast and accurate ultra-short-term load forecasting is beneficial for building an efficient and modern smart grid. This paper proposes an ultra-short-term load forecasting model based on Variational Mode Decomposition (VMD) and improved Bi-directional Long Short-Term Memory (BiLSTM) network. The model first decomposes the complex load historical sequence using VMD, reducing the non-stationarity and complexity of the load sequence to facilitate the prediction task using neural networks. Then, the improved BiLSTM network is used to allow input data to skip some transformations in the network, thereby deeply and bidirectionally mining various hidden information from historical sequences. Finally, this paper selects temperature as the factor most correlated with power load forecasting and incorporates it into the prediction process to achieve effective ultra-short-term load forecasting. Compared with existing models such as LSTM, SVM, LeNet, DRNet4-7, and unimproved VMD-BiLSTM based on example data, the simulation results show that the proposed model can predict the load changes within one hour in the future, achieving ultra-short-term load forecasting, and has good prediction accuracy and algorithm robustness.