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As some of the richest sources of natural antioxidants, small berry fruits have attractive colors and special tastes, with recognized benefits for human health. However, sour tastes in small berry juices result in a poor flavor and low acceptance among consumers, greatly limiting their marketability. Among the most commonly used deacidification methods, chemical deacidification methods can neutralize fruit juice via the addition of a deacidification agent, while physical deacidification methods include freezing deacidification, ion-exchange resin deacidification, electrodialysis deacidification, and chitosan deacidification. All of these methods can markedly improve the pH of fruit juice, but they introduce new substances into the juice that may have an influence on its color, taste, and stability. Biological deacidification can effectively remove malic acid from fruit juice, reducing the content from 15 g/L to 3 g/L; additionally, it maintains the taste and stability of the juice. Therefore, it is widely applied for fruit juice deacidification. On this basis, some compound deacidification technologies have also emerged, but they also present problems such as high costs and complicated working procedures. This review of deacidification methods for small berry juice provides a foundation for the industrial development of such juices. [ABSTRACT FROM AUTHOR]

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper addresses the question of how the ups and downs in the development of artificial intelligence (AI) since its inception can be explained. It focuses on the development of artificial intelligence in Germany since the 1970s, and particularly on its current dynamics. An assumption is made that a mere reference to rapid advances in information technologies and the various methods and concepts of artificial intelligence in recent decades cannot adequately explain these dynamics, because from a social science perspective, this is an oversimplified, technology-centred explanation. Drawing on ideas from social scientific innovation research, the hypothesis is rather that artificial intelligence should be understood as a "promising technology". Its various stages of development have always been driven by technological promises about its special powers and capabilities when applied to solving economic and societal challenges. [ABSTRACT FROM AUTHOR]

In order to solve the technical problems of the super-diameter slurry shield in the waterinrush, sand-bursting and mud-bursting strata at the entrance of the receiving tunnel in the water-rich silt and sand strata near the sea, the differences between the super-diameter and the small-diameter shield in the underwater reception are analyzed by taking the key receiving technology of the super-diameter slurry shield in the water-rich strata of the Shantou Bay Tunnel Project as an example. Based on the receiving process of super-large diameter shield, this paper expounds the solution methods of super-large diameter slurry shield in the aspects of end reinforcement, receiving shaft plugging wall construction, receiving base construction, single-layer glass fiber reinforced concrete tunnel door breaking, penetration measurement, receiving tunneling and grouting, tunnel door plugging, etc., including shield posture control, tunneling parameter control, grouting control, segment re-tightening The key technologies of the super-large diameter shield receiving are analyzed from several aspects of the temporary plugging of the tunnel portal. The mortar receiving base is set to provide sufficient reaction force for the shield receiving to ensure the safety of the shield tunneling. The synchronous grouting and secondary grouting closing is employed to improve the reinforcement quality, strengthen the segment re-tightening and ensure the stability of the shield tunnel structure strength. For the last five rings, special perforated ring segments are used to improve the grouting effect. Then, the drainage and sand removal is carried out, and the reinforcement framework and shotcrete are constructed from top to bottom to block the tunnel door, reduce the exposure time of the tunnel door without blocking, ensure the construction safety of the tunnel door, and other measures are taken to ensure the safety of the underwater reception. [ABSTRACT FROM AUTHOR]

Background: High-definition maps can provide necessary prior data for autonomous driving, as well as the corresponding beyond-line-of-sight perception, verification and positioning, dynamic planning, and decision control. It is a necessary element to achieve L4/L5 unmanned driving at the current stage. However, currently, high-definition maps still have problems such as a large amount of data, a lot of data redundancy, and weak data correlation, which make autonomous driving fall into difficulties such as high data query difficulty and low timeliness. In order to optimize the data quality of high-definition maps, enhance the degree of data correlation, and ensure that they better assist vehicles in safe driving and efficient passage in the autonomous driving scenario, it is necessary to clarify the information system thinking of high-definition maps, propose a complete and accurate model, determine the content and functions of each level of the model, and continuously improve the information system model. Objective: The study aimed to put forward a complete and accurate high-definition map information system model and elaborate in detail the content and functions of each component in the data logic structure of the system model. Methods: Through research methods such as the modeling method and literature research method, we studied the high-definition map information system model in the autonomous driving scenario and explored the key technologies therein. Results: We put forward a four-layer integrated high-definition map information system model, elaborated in detail the content and functions of each component (map, road, vehicle, and user) in the data logic structure of the model, and also elaborated on the mechanism of the combined information of each level of the model to provide services in perception, positioning, decision making, and control for autonomous driving vehicles. This article also discussed two key technologies that can support autonomous driving vehicles to complete path planning, navigation decision making, and vehicle control in different autonomous driving scenarios. Conclusions: The four-layer integrated high-definition map information model proposed by this research institute has certain application feasibility and can provide references for the standardized production of high-definition maps, the unification of information interaction relationships, and the standardization of map data associations. [ABSTRACT FROM AUTHOR]

Copyright of Railway Construction Technology is the property of Railway Construction Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Deep-sea underwater technology and equipment are crucial aspects to cognize the deep sea, exploit deep-sea resources, and protect the marine ecosystem. Expanding the deep-sea space faces complex environmental challenges and urgently requires support of high-level deep-sea underwater technologies and equipment. This study analyzes the components and demands for the deep-sea underwater technology and equipment and reviews the current status and development trends of the technology and equipment from four aspects: deep-sea observation/detection and perception, underwater construction, deep-sea oil and gas production, and deep-sea mineral resource collection. Moreover, this study analyzes the development status and engineering challenges in China, explores the key technology and equipment systems and key physical–mechanical mechanisms behind them, and summarizes the typical equipment and corresponding diagram. Additionally, the common key technologies of the deep-sea underwater equipment in China are summarized, including the intelligent and automation technology, precision component processing and manufacturing technology, high-precision positioning and navigation technology, high-speed communication technology, computational and analytical mechanics of large systems, and multiscale engineering design methods and technologies. Furthermore, countermeasures and suggestions are proposed aiming at achieving high-quality development of the deep-sea underwater technology and equipment in China: strengthening the top-level design of deep-sea underwater engineering to promote the establishment of a coordinating system for common key technologies, enhancing the industry influence of Chinese deep-sea underwater technical standards to explore the international market, promoting the construction of compatible and universal platforms with high quality, and training innovation professionals to provide support for the high-level development of the marine science and technology industry.

[Objective] In order to thoroughly implement the national strategy of building China with a strong transportation network and the low-carbon assembly and construction concepts such as standardization, intelligence and refinement, and to address the problems of insufficient construction accuracy, outdated construction equipment, lack of maintenance methods, and poor overall life cycle systematicity caused by the current cast-in-place ballast, which is presently the main track structure in urban rail transit, it is necessary to make research on high-precision prefabricated track technology for urban rail transit. [Method] In terms of the prefabricated tracks, theoretical research and scheme design, effect experiments and verification, and online monitoring of track conditions are carried out in accordance with the overall research and development technology route of "standardized design, factory production, mechanized construction, high-precision control, and full life management", and based on the Phase II and Phase III construction projects of Shanghai Metro. The application effect of the high-precision prefabricated track is briefly introduced. [Result & Conclusion] The key technologies of prefabricated track in urban rail transit, including high-precision prefabrication and assembly technology, energy saving construction facility technology, green construction technology and intelligent monitoring technology are developed, significantly improving the quality of rail construction, rail operation and maintenance. The application of high precision prefabricated track technology improves the construction precision of track structure effectively, improves the indicators like excellent geometry, stability and smoothness of the track structure significantly. Series of trackless construction equipment saves a lot of manpower, material resources and time cost during construction. The application of track condition online monitoring system and management platform reduces the workload of manual inspection by 30%~40%, increases the maintenance efficiency by 20%~30% and the disease detection rate by 30%~40%, reducing the environmental impact of urban rail transit train operation.

[Objective] The cover development design for urban rail transit parking lot is very complicated, requiring more new column grids. Moreover, after the cover development, the omnidirectional antenna set up on the roof of the complex building cannot cover the ground area of the parking lot. In order to effectively realize the wireless communication coverage of the parking lot, it is necessary to study the related schemes and key technologies. [Method] Based on the systematic engineering design of TETRA (terrestrial trunked radio) communication system for the parking lot of Textile City Station on Xi’an Metro Line 6 and in view of the difficulties of wireless communication coverage engineering, the frequency planning and allocation scheme of wireless communication system is proposed. A wireless communication coverage scheme is proposed for the parking lot, switch area, access sections and roads in the non-cover area of the parking lot. [Result & Conclusion] FA (frequency allocation) frequency group for wireless communication coverage is adopted for the parking lot of Textile City Station, which ensures frequency interval and avoids same frequency interference. The public security wireless communication system is introduced into the above parking lot, and the scheme of signal route coverage combined with the dedicated wireless communication system is adopted. Directional antenna is used as the coverage mode for the covered parking area to replace the omnidirectional antenna on the roof. Antenna correlation is used for the depot, antenna reinforcement for the throat area, and antenna coverage for U-shaped slot to solve the cross-zone switching , and directional antennas are adopted to cover the surrounding roads by utilizing building sidewalls or columns. The proposed wireless system coverage scheme for the cover development parking lot not only reduces the system interference and the impact on the existing operation, but also effectively solves the problem of the wireless communication coverage for the cover development parking lot, saving the project investment.

AbstractWith the development of the manufacturing industry and the continuous progress of science and technology, as one of the core equipment of the high-end manufacturing industry, CNC lathe is also developed and improved. After searching a large amount of literature, through the elaboration of the current domestic and foreign research institutions for the CNC lathe research history, development level and development status, comparative analysis of different types of CNC lathe structure, characteristics and applications, concluded that the CNC lathe is the best choice for the current rotary parts machining manufacturing tools. On this basis, it analyzes and summarizes the tool path planning, cutting process optimization, high-speed cutting technology and other key technical issues to be solved in the future development of CNC lathe, and finally looks forward to the development trend of CNC lathe, in order to provide references for related research.

China has made notable advancements in the intelligent construction of coal mines. However, for longwall top coal caving (LTCC) mining faces, a key obstacle impeding the intelligent transition of the coal-cutting process is automated control. This paper focuses on the aforementioned issue and comprehensively considers the pre-, intra-, and post-coal-caving stages. In this work, diverse detection and monitoring technologies are integrated at various stages through a computer platform, facilitating the construction of an automated coal caving control system with self-perception, self-learning, self-decision-making, and self-execution capabilities. Key technologies include ground-penetrating radar-based top coal thickness detection, inertial navigation-based shearer positioning, tail beam vibration-based identification of coal and gangue, and magnetostrictive sensor-based monitoring of the tail beam and insert plate attitude. In this study, the 12309 working face of the Wangjialing Coal Mine was experimentally validated, and the efficacy of the aforementioned key technologies was assessed. The results demonstrated that the control requirements for automated coal caving are satisfied by the maximum errors. Automatic regulation of coal caving was realized through the implementation of this system, thereby facilitating initiation and cessation and yielding promising experimental outcomes. Overall, this system offers practical insights for intelligent construction in current LTCC mining faces and the sustainable development of coal resources. [ABSTRACT FROM AUTHOR]

As one of the traditional provinces of beef cattle breeding in China, Guizhou Province carries the high-quality supply of beef for people of the province and even the whole country of China. However, at present, the development level of large-scale beef cattle breeding in Guizhou Province is not high, and the hardware equipment and feeding management in line with international standards are relatively weak. Based on practical experience, firstly, the current situation of large-scale beef cattle breeding in Guizhou Province was summarized, and then the key breeding technologies suitable for the development of large-scale beef cattle breeding in Guizhou Province was put forward, aiming to provide references for promoting the development of beef cattle breeding industry in Guizhou Province. [ABSTRACT FROM AUTHOR]

Copyright of Railway Construction Technology is the property of Railway Construction Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

UAV real time photogrammetry is a kind of high technology with rapid development and wide application prospect. In order to better understand the current application status and future development trends of UAV photogrammetry technology, the basic principles of UAV photogrammetry technology are systematically sorted out through a literature review. The key technologies of UAV photogrammetry are reviewed from four aspects; flight platform and control, route planning and navigation, image processing and extraction, and 3D modeling and application. The application status of UAV photogrammetry technology is discussed from four fields; urban planning and construction, disaster monitoring and assessment, cultural relic protection and research, and land use and management. The research shows that through the optimization of data processing and analysis algorithms and the development of intelligence and automation to improve the innovative application of these two aspects, can greatly promote the development of UAV real-time photogrammetry technology, and better achieve the development goals of high quality, high efficiency, and high safety. [ABSTRACT FROM AUTHOR]

Copyright of Coatings & Protection / Tuceng yu Fanghu is the property of Coating & Protection Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Forests have been the most important components of terrestrial ecosystems to maintain the ecological balance and national ecological security. Unmanned aerial vehicles (UAVs) have emerged as the representatives of intelligent forestry equipment in recent years, with the ever-increasing demand for forestry informatization, precision, and intelligence. UAV technology can also play a key role in the precise investigation, design, planning, and management of forests. The concept of precision forestry has gained much recognition in the industry, leading to the high demand for UAV technology. A hot issue is to effectively synergize the UAV technology with the development needs of modern forestry, in order to achieve the precise quality and sustainable forest. This review was focused on the background and current status of UAV technology in the field of precision forestry. A combination of bibliometric analysis and case study was employed to provide an in-depth summary of the application of UAV technology in various areas of precision forestry, including forest resources investigation and monitoring, early warning of forest pests and diseases, forest fire prevention and control, forestry plant protection, and forestry management and law enforcement. The advantages and limitations of UAV technology were objectively analyzed in these areas. The study results indicate that the UAV technology made significant progress in the field of precision forestry, primarily driven by the demands of forestry practitioners. Traditional operations can be expected to update and improve the key UAV technologies. The UAV was used to provide high-resolution image data support for the forest resources survey and monitoring, enabling the efficient extraction of forest stand factors. In terms of early warning of forest pests and diseases, UAV was utilized to accurately identify the various pests and diseases, and then delineate the infected forest areas. In forest fire prevention and control, the UAV was used to predict and monitor the forest fires, providing for the latest news for firefighting. In forestry plant protection, the UAV applications in pesticide application, irrigation, and seeding effectively reduced resource wastage. In forestry management and law enforcement, the UAV was used to offer a safer way to monitor the forest ecosystems, prevent wildlife, and combat illegal activities. Some challenges were also given to the UAV technology in the implementation of precision forestry. These challenges mainly included the inadequate battery capacity of UAVs, high prices of UAV sensors, difficulties in fusing multi-source data, limited clustering and intelligent capabilities of UAVs, as well as the urgent improvement in the UAV-related laws and regulations. In conclusion, this finding can provide valuable insights into the application of UAV technology in precision forestry. Deep integration of UAV technology can also be further strengthened for the entry needs in the future, in order to promote the rapid and sustainable development in precision forestry. [ABSTRACT FROM AUTHOR]

Copyright of Urban Mass Transit is the property of Urban Mass Transit Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Urban Mass Transit is the property of Urban Mass Transit Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

China’s equipment manufacturing system and Europe’s experience in project complement each other. Firstly, this paper focused on the industrial chain and key technologies of floating offshore such as wind turbines, floating foundations, mooring and anchoring system, dynamic submarine cables, survey and design, construction, transportation and installation, operation and maintenance, etc. An evaluation system for the industrial chain with deep vertical analysis and horizontal expansion and comparison was established. Then, combined with the results of China-Europe comparison in different segments, 18 key cooperation areas were proposed. Finally, the study also explored the 4 stages of cooperation paths: exchange & sharing, cooperative construction, scale application and global promotion. It is expected to solve the problems of sole form of demonstration prototype foundation, high cost and immature industry chain,and provide certain ideas and inspiration between China and Europe floating offshore wind power cooperation.

With the large-scale mining of coal resources, there are more and more potential hazards of coal mine geological disasters. Coal mine disaster accidents often have the characteristics of suddenness, contingency and complex. Information technology can quickly integrate and process multi-source information, which is an important support for effective rescue. The article is based on the actual situation of coal mine safety production, combined with the business characteristics of geological exploration units, based on the analysis of system requirements, this paper designs the system functions, puts forward the key technologies and implementation methods of system construction, and develops and constructs an information system that meets the actual needs of coal mine geological emergency rescue. Taking a coal mine in Ningnan Coalfield as an example, the rationality of the system function is verified.

The sixth-generation mobile communications (6G) will usher in a new era of information technology that is characterized by “intelligence empowering all things and wisdom being self-generated”. Simultaneously, corresponding technological research has become a new trend in the mobile communication industry. In the context of large-scale commercialization of the fifth-generation mobile communications (5G) in China, it is of great significance to clarify the development needs, understand the development trend, and propose the development layout of 6G for accelerating the development of the digital economy and seizing the international competitive advantage in the future. This study summarizes the problems of 5G development that still need to be addressed by 6G, including insufficient application depth, inadequate demand coverage, and low return on investment. It points out some key application scenarios that urgently need 6G empowerment, and comprehensively reviews the strategic deployment of 6G in developed and major developing countries, clarifying major trends such as optimizing and upgrading traditional industries through 6G commercialization, achieving major breakthroughs in 6G key core technologies, and strengthening 6G network security to modernize the national security system. Currently, China’s development of 6G faces prominent challenges regarding research and development investment,technology standards, open ecology, network security, and privacy protection. Therefore, it is necessary to use the new national system to break through technological innovation barriers, enhance the formulation of 6G standards, deepen international cooperation on 6G to build an open and win-win global industrial ecosystem, and develop core 6G technologies to establish a secure and controllable technical system. This study is expected to provide theoretical inspirations and practical references for the development and innovative application of 6G technology in China.

As some of the richest sources of natural antioxidants, small berry fruits have attractive colors and special tastes, with recognized benefits for human health. However, sour tastes in small berry juices result in a poor flavor and low acceptance among consumers, greatly limiting their marketability. Among the most commonly used deacidification methods, chemical deacidification methods can neutralize fruit juice via the addition of a deacidification agent, while physical deacidification methods include freezing deacidification, ion-exchange resin deacidification, electrodialysis deacidification, and chitosan deacidification. All of these methods can markedly improve the pH of fruit juice, but they introduce new substances into the juice that may have an influence on its color, taste, and stability. Biological deacidification can effectively remove malic acid from fruit juice, reducing the content from 15 g/L to 3 g/L; additionally, it maintains the taste and stability of the juice. Therefore, it is widely applied for fruit juice deacidification. On this basis, some compound deacidification technologies have also emerged, but they also present problems such as high costs and complicated working procedures. This review of deacidification methods for small berry juice provides a foundation for the industrial development of such juices.

Power-assisted lower limb exoskeleton robot is a wearable intelligent robot system involving mechanics, materials, electronics, control, robotics, and many other fields. The system can use external energy to provide additional power to humans, enhance the function of the human body, and help the wearer to bear weight that is previously unbearable. At the same time, employing reasonable structure design and passive energy storage can also assist in specific actions. First, this paper introduces the research status of power-assisted lower limb exoskeleton robots at home and abroad, and analyzes several typical prototypes in detail. Then, the key technologies such as structure design, driving mode, sensing technology, control method, energy management, and human-machine coupling are summarized, and some common design methods of the exoskeleton robot are summarized and compared. Finally, the existing problems and possible solutions in the research of power-assisted lower limb exoskeleton robots are summarized, and the prospect of future development trend has been analyzed. [ABSTRACT FROM AUTHOR]

Copyright of Power Generation Technology is the property of Power Generation Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Brewing is the property of China Brewing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The combat tasks faced by UAVs are becoming more and more complex. Traditional single UAVs are limited by the constraints of platform load capacity, lightweight load, and insufficient low-power equipment, so it is difficult to complete complex tasks independently. Aiming at typical UAV collaborative confrontation application scenarios, this paper constructs a multi-agent-oriented cluster collaborative intelligent system architecture and establishes a swarm-oriented intelligent UAV cluster collaborative control algorithm. Moreover, this paper forms a simulation environment for UAV cluster collaborative confrontation and completes the design and implementation of the UAV cluster collaborative confrontation system based on swarm intelligence. In addition, this paper analyses the key technologies of the UAV cluster collaborative system with the support of the Internet of Things technology and verifies the performance of the system after constructing the corresponding system. The experimental results show that the system constructed in this paper is effective. [ABSTRACT FROM AUTHOR]

Traditional audio processing technology often faces the challenge of efficiency and accuracy in the face of large-scale audio data and complex sound content. The purpose of this study is to develop the key technology of audio retrieval and vocal music teaching system based on sensor network, aiming at the rich audio data and real-time monitoring function provided by sensor network. The sensors suitable for audio retrieval and vocal music teaching were selected and rationally arranged in the designated position to obtain accurate and comprehensive audio data. The algorithm is also optimized and improved to improve the performance and stability of the system. The accuracy and efficiency of audio retrieval can be effectively improved by using sensor networks. The vocal music teaching system based on sensor networks can provide comprehensive and accurate sound evaluation and guidance. Good results have been obtained in the practical application of this method, which proves its feasibility and effectiveness in the field of audio retrieval and vocal music teaching.

New computing applications present new challenges to communication networks, for example, traditional network cannot meet the demands of flexible deployment, customized services, security and trustworthiness of new services.As a development paradigm that separated network technology and supported environment, polymorphic network provided new solutions to support the differentiated demands of various new applications.A type of computation-oriented network modality namely computing power network modality was discussed, for the computation-oriented business requirements based on the development trend of computing power network.Firstly, the design of computing power network modality was investigated, then the key technologies of computing power network modality were analyzed.Finally, the application scenarios of computing power network were prospected.It is hoped that the discussion can provide a reference for the future research and development on application of computation-oriented polymorphic network.

Background: High-definition maps can provide necessary prior data for autonomous driving, as well as the corresponding beyond-line-of-sight perception, verification and positioning, dynamic planning, and decision control. It is a necessary element to achieve L4/L5 unmanned driving at the current stage. However, currently, high-definition maps still have problems such as a large amount of data, a lot of data redundancy, and weak data correlation, which make autonomous driving fall into difficulties such as high data query difficulty and low timeliness. In order to optimize the data quality of high-definition maps, enhance the degree of data correlation, and ensure that they better assist vehicles in safe driving and efficient passage in the autonomous driving scenario, it is necessary to clarify the information system thinking of high-definition maps, propose a complete and accurate model, determine the content and functions of each level of the model, and continuously improve the information system model. Objective: The study aimed to put forward a complete and accurate high-definition map information system model and elaborate in detail the content and functions of each component in the data logic structure of the system model. Methods: Through research methods such as the modeling method and literature research method, we studied the high-definition map information system model in the autonomous driving scenario and explored the key technologies therein. Results: We put forward a four-layer integrated high-definition map information system model, elaborated in detail the content and functions of each component (map, road, vehicle, and user) in the data logic structure of the model, and also elaborated on the mechanism of the combined information of each level of the model to provide services in perception, positioning, decision making, and control for autonomous driving vehicles. This article also discussed two key technologies that can support autonomous driving vehicles to complete path planning, navigation decision making, and vehicle control in different autonomous driving scenarios. Conclusions: The four-layer integrated high-definition map information model proposed by this research institute has certain application feasibility and can provide references for the standardized production of high-definition maps, the unification of information interaction relationships, and the standardization of map data associations.

Due to the rising concept of advanced air mobility (AAM), electric vertical take-off and landing (eVTOL) aircraft has become the hotspot for academic research and commercial application. This paper provides a comprehensive review of latest researches related to autonomous eVTOL. It examines key technologies involved in autonomous eVTOL, including automated flight control, sensing & perception, safety & reliability, and decision making. It also addresses the technical, regulatory, and societal challenges associated with the wholesale adoption of autonomous eVTOL into AAM. The paper concludes with a discussion of future trends and recommendations, including the importance of integration with air traffic management, urban infrastructure and human–machine interaction. It aims to be a useful resource for those involved in the research, policy, and industry of autonomous eVTOL technology.

A spiral steel silo has become the preferred choice for building steel silos because of its short construction period, low cost, and high strength. Owing to the harsh outdoor welding conditions of the spiral steel silo and the high risk of manual welding, in this paper, an automatic welding robot is proposed, and its key technology is studied. The welding process parameters consisted of welding voltage, current, and the distance between the conductive nozzle and the base material, which were determined through experiments. The key technology of seam tracking on the roof of a spiral steel silo was studied. Finally, a weld bead tracking experiment and prototype welding experiment were carried out. The results suggest that the prototype can track the weld bead stably and accurately, and the welding effect can meet welding process requirements when the welding current is 200 A, the voltage is 20 V, and the distance between the welding nozzle and the base material is 12 mm. [ABSTRACT FROM AUTHOR]

Copyright of Telecommunications Science is the property of Beijing Xintong Media Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The technology development trend of intelligent customer service for operators was discussed, and automatic speech recognition (ASR) transcription error correction technology, semantic extraction technology, encrypted database, and agent access control technology were introduced.Two different research directions of error detection and automatic error correction for speech recognition were analyzed, two directions of supervised learning and unsupervised learning were discussed, and big data encryption and agent access control technologies were introduced.At the same time, the technical directions of multimodal interaction technology, intelligent recommendation technology and disabled-oriented services were prospected.In conclusion, the development and innovation of intelligent customer service technology will bring a more efficient and convenient service experience to the communication industry and strongly promote the progress of the industry service level.

[Introduction] As a zero-carbon fuel, ammonia is easy to achieve safe and low-cost transportation and thus is considered to be an ideal energy source with the same development potential as hydrogen energy. Understanding the development status of core technologies in each link of the ammonia energy industry chain will help grasp the development prospects and direction of the ammonia energy industry. [Method] By investigating the core technologies and application scenarios involved in key links (including preparation, storage, transportation, and utilization) of the ammonia energy industry chain and analyzing the problems faced by the industry development, this study put forward corresponding development suggestions. [Result] Although the traditional Haber process for ammonia synthesis is very mature, the green transition of ammonia production can be achieved via green hydrogen feedstock substitution or adoption of new ammonia synthesis technologies such as photocatalysis, electrocatalysis, bioenzyme catalysis, and plasma drive. The storage and transportation of green ammonia can rely on the traditional synthetic ammonia infrastructure as well as supply chain, and the construction of supporting facilities such as ammonia fuel filling stations should be also strengthened. Ammonia combustion, ammonia fuel cells, ammonia energy storage and other ammonia energy utilization technologies need to be continously researched and developed as well as explored for application demonstration. [Conclusion] The development of green ammonia energy industry is in line with the requirements of building a clean, low-carbon, safe and efficient green energy system in China, and it has a positive impact on our country's energy security. However, the industrialization promotion of ammonia energy still faces many challenges and requires reasonable planning as well as layout and support from policy, finance, innovation platforms and standard system.

The miniature air-launched decoy is an air-launched electronic countermeasure aircraft of the US army, which can perform various battlefield missions such as reconnaissance, decoy, suppression and strike.Relying on the decoy platform, the decoy has continuously expanded its potential capability. It has developed from a simple electronic decoy consumable weapon to a comprehensive radio frequency decoy based on modular payload design, which can play an important role in the entire equipment system and combat mode of the US army. Based on the introduction of the miniature air-launched decoy, the paper analyzes its battlefield application mode and some key technologies supporting the combat, and prospects the future development and application of the integrated radio frequency decoy equipment.

The development of karst in Karst area leads to poor stability of stratum. If earthquake occurs, the area will produce destructive disaster. In order to improve the stability capacity of the grassroots in the region, this study investigates the seismic response of inter-story isolation structures considering soil-structure interaction (SSI) in three-dimensional earthquakes. A model of the inter-story isolation structure incorporating SSI was developed, and one-dimensional, two-dimensional, and three-dimensional ground motions were applied to compare the seismic response under different input conditions. A three-dimensional isolation system was introduced and compared with traditional horizontal isolation structures to address excessive tensile and compressive stresses on the isolation structure during three-dimensional ground motion. The results demonstrate that the seismic response to three-dimensional earthquakes surpasses one-dimensional and two-dimensional inputs. Furthermore, adding a three-dimensional isolation structure effectively isolates vertical ground motion and reduces structural seismic response. Moreover, it minimizes soil stresses on the foundation compared to traditional horizontal isolation structure, enhancing foundation stability. This study will provide theoretical value and practical guidance for the research on key technology of SSI base story isolation structure response in Karst Plateau 3D Seismic zone.

The oblique detonation engine (ODE) utilizes standing oblique detonation wave (ODW) to efficiently convert the chemical energy of fuel into mechanical energy in hypersonic flow, greatly improving the upper limit of the air-breathing flight regime, which holds significant development potential and practical value. This paper provides an overview of the development of ODE in the early, middle, and recent stages. Then, the current research status on oblique detonation combustion and engines are summarized. Furthermore, the progress made worldwide in three areas, oblique detonation combustion organization, fuel injection mixing, and overall performance with internal flow design, are reviewed from the perspective of engine design. Finally, the technique challenges and future key focus directions in five aspects, including integrated design of internal and external flow under overall constraints, fuel injection and mixing in hypersonic flow, stable combustion organization under complex inflow conditions, high thermal load protection, and experimental conditions under ultra-high speed conditions are analyzed, aiming to provide reference for future in-depth technological breakthroughs and applications. [ABSTRACT FROM AUTHOR]

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