Visualization Analysis of Literature on Building Photovoltaic Technology Based on CiteSpace

With the proposal of the double carbon target,the task of energy saving and emission reduction of buildings has become more arduous.The application of building photovoltaic technology is identified as a significant breakthrough to address this challenge.In this paper,the visual analysis and interpretation of literature on building photovoltaic(PV)technology were conducted by using the Cite Space analysis tool based on a review of Chinese and international literature databases.Meanwhile,global research on BIPV technology was summarized and compared.This paper provides ideas for the future application of building photovoltaic technology by constructing a knowledge map for the application of building photovoltaic technology to help the construction of a low-carbon society.

Ethical Principles and Governance Technology Development of AI in China

Ethics and governance are vital to the healthy and sustainable development of artificial intelligence(AI).With the long-term goal of keeping AI beneficial to human society,governments,research organizations,and companies in China have published ethical guidelines and principles for AI,and have launched projects to develop AI governance technologies.This paper presents a survey of these efforts and highlights the preliminary outcomes in China.It also describes the major research challenges in AI governance research and discusses future research directions.

First principles study of the electronic structure and photovoltaic properties ofβ-CuGaO2 with MBJ+U approach

Based on the density functional theory,the energy band and electronic structure ofβ-CuGaO2 are calculated by the modified Becke-Johnson plus an on-site Coulomb U(MBJ+U)approach in this paper.The calculated results show that the band gap value ofβ-CuGaO2 obtained by the MBJ+U approach is close to the experimental value.The calculated results of electronic structure indicate that the main properties of the material are determined by the bond between Cu-3 d and O-2p energy levels near the valence band ofβ-CuGaO2,while a weak anti-bond combination is formed mainly by the O-2p energy level and Ga-4 s energy level near the bottom of the conduction band ofβ-CuGaO2.Theβ-CuGaO2 thin film is predicted to hold excellent photovoltaic performance by analysis of the spectroscopic limited maximum efficiency(SLME)method.At the same time,the calculated maximum photoelectric conversion efficiency of the ideal CuGaO2 solar cell is 32.4%.Relevant conclusions can expandβ-CuGaO2 photovoltaic applications.

Joint Bearing Mechanism of Coal Pillar and Backfilling Body in Roadway Backfilling Mining Technology

In the traditional mining technology,the coal resources trapped beneath surface buildings,railways,and water bodies cannot be mined massively,thereby causing the lower coal recovery and dynamic disasters.In order to solve the aforementioned problems,the roadway backfilling mining technology is developed and the joint bearing mechanism of coal pillar and backfilling body is presented in this paper.The mechanical model of bearing system of coal pillar and backfilling body is established,by analyzing the basic characteristics of overlying strata deformation in roadway backfilling mining technology.According to the Ritz method in energy variation principle,the elastic solution expression of coal pillar deformation is deduced in roadway backfilling mining technology.Based on elastic-viscoelastic correspondence principle,combining with the burgers rheological constitutive model and Laplace transform theory,the viscoelastic solution expression of coal pillar deformation is obtained in roadway backfilling mining technology.By analyzing the compressive mechanical property of backfilling body,the time formula required for coal pillar and backfilling body to play the joint bearing function in roadway backfilling mining technology is obtained.The example analysis indicates that the time is 140 days.The results can be treated as an important basis for theoretical research and process design in roadway backfilling mining technology.

The Development and Application of Blowing-carding Technology

This paper introduces the development,compositions and characteristics of the domestic and foreign blowing-carding technique,discusses the technology of blowing-carding machines and the structures and functions of the main machines,analyses the production experiments of three types of blowing-carding flow lines in detail,and puts forward the effective measures to control the main quality index of blowing-carding sliver and the trend of blowing-carding technique development.

Progress of photovoltaic technology in China

Chinese government has been devoting itself to the development of renewable energy sources. This paper describes the history, achievement and future trends of photovoltaie technology, and suggestions axe proposed for strengthening the research and development （R＆D） ability of China.

Evaluation of Four Geomembrane-Mounted PV Systems for Land Reclamation in Southern Arizona

Four different PV （photovoltaic） systems deployed around Tucson Arizona on geomembranes are used to test the feasibility of converting mine tailings and landfills into solar energy generating sites. Differences between these deployed systems include： two types of geomembrane materials, two different module anatomies and two different locations. Module mounting techniques unique to mine tailing sites are described. Several system failures observed during the first two years of operation are explained here in detail. Validated predictions for the operating temperature of these systems and their associated electrical performance are presented. It was determined that PV modules mounted on light-colored thermoplastic with shielded wiring operate at lower temperatures, are structurally stable, and experience fewer wiring failures.

国外激光原理经典教材评介与利用研究——以《Lasers》《Laser Fundamentals》《Principles of Lasers》评介为例

为加强国外教材的研究评介和信息服务工作,维护并完善教育部国外教材综合信息平台,推进对国外各学科优秀教材的研究与评介,本课题选定了国外有代表性的、世界著名大学所用的三本激光原理教材作为研究对象。在学习和借鉴发达国家激光原理教材成功经验的基础上,通过深入地分析、研究、比较和归纳总结,对所选三本激光原理经典教材做了客观地评价与介绍,为教育部外国教材的引进与利用提供了重要参考。

Principle and engineering application of pressure relief gas drainage in low permeability outburst coal seam

With the increase in mining depth, the danger of coal and gas outbursts increases.In order to drain coal gas effectively and to eliminate the risk of coal and gas outbursts, we used a specific number of penetration boreholes for draining of pressure relief gas.Based on the principle of overlying strata movement, deformation and pressure relief, a good effect of gas drainage was obtained.The practice in the Panyi coal mine has shown that, after mining the C11coal seam as the protective layer, the relative expansion deformation value of the protected layer C13 reached 2.63%, The permeability coefficient increased 2880 times, the gas drainage rate of the C13 coal seam increased to more than 60%, the amount of gas was reduced from 13.0 to 5.2 m3/t and the gas pressure declined from 4.4 to 0.4 MPa, which caused the danger the outbursts in the coal seams to be eliminated.The result was that we achieved a safe and highly efficient mining operation of the C13 coal seam.

Generalized control of quantum systems in the frame of vector treatment

For the state control problem in finite-dimensional quantum systems with any initial state and a goal eigenstate, this paper studies the design method of control laws via the Lyapunov technology and in the vector frame, which ensures the convergence of any initial state toward the goal state. The stability of the closed-loop system in the goal eigenstate is analyzed and proven via the invariance principle. The simulation experiment on a spin-1/2 system shows the effectiveness of the designed control laws.

Research on Key Technologies of Solar Photovoltaic Building Integration

On December 21,2020,The State Council Information Office issued a white paper titled"China's Energy Development in the New Era,"in which the installed capacity of hydropower,wind power,photovoltaic power and biomass power generation in China ranked first in the world[1].Solar photovoltaic power generation is the most important development direction of clean energy in the world.It is an important energy strategy to combine it with the field of construction in China.This paper mainly introduces the characteristics and problems of the key technologies of solar photovoltaic building integration,and explores its future development direction and ways,in order to constantly promote the industrialization of new energy technology in China.

Integration of the Energy and Building Technologies

The performance of each type of building must meet all the needs and requests of new real estate markets. In fact, in the excellent architectures, the user can manage, with autonomy and flexibility, each system and product, according to the new energy and building technologies too. The main objective is the social and environmental sustainability with the reduction of fossil fuels and the greenhouse gas effect, pushing the use of renewable energies, in a new trend of land regeneration with sustainable buildings and settlement recovery. The energy crisis, mainly generated by the climate change, the air pollution, with consequent extinction of the species, reduction of the land and the work, the degradation and the environmental and seismic risk, focuses on the security and quality of construction systems, integrated use of clean resources. The methodologies aimed at integrating of energy-efficient and innovative building technologies in architecture, from design to management, to produce electric and thermal energy with active and passive properties, for a high-performance habitat. Therefore, the use of solar photovoltaic in the buildings, BIPV （Building Integrated Photovoltaic） with high-performance glass vision, efficient systems, intelligent materials, is integrated in architectures with the use of innovative construction systems, finally, technology of OPV （Organic Photovoltaic）, multi-junction cells, the dye sensitized solar cells in the solid state, etc., and adoption of storage systems.

Principle and Key Technologies of OFDM-RoF

The merging of optical communication and wireless communication is a tendency in the development of future communication.Orthogonal Frequency Division Multiplexing (OFDM) technology is becoming a core technology in the physical layer of next generation wireless communication system.Taking advantages of both wireless communication and optical communication,OFDM Radio over Fiber (OFDM-RoF) system is characterized by high speed,large capacity and high spectral efficiency.However,it still has some problems to be addressed,including dispersion and nonlinearity effects.The nonlinearity effect of fiber and modulator can be mitigated by PAPR reduction algorithms,the dispersion effect can be eliminated using Cyclic Prefix (CP) and channel estimation,and the fiber nonlinearity can be reduced by techniques such as digital phase conjugation,Partial Carrier Filling (PCF),nonlinearity precompensation and serial correlation reduction.

The Compilation Principles of EST Teaching Materials

English for Science and Technology （EST）, as one branch of English for Special Purposes, has its own distinctive features and plays a significant role in today＇s English education. In language teaching, teaching materials play an important role. To a great extent, they determine the content and approaches of teaching and learning and affect the quality of language education. The author of this paper makes a tentative analysis of the compilation principles of EST teaching materials, from the perspective of students, scientific and technological discipline, and the English language, highlighting the content of teaching and the motivation of students. This paper proposes the Principles of Interest, Life-Long Development, Appropriateness, Systematization, Cognitive Scientificalness, Illumination, Integration of Abstract Knowledge and Specific Cases, Authenticity, Timeliness, and Comprehensive Improvement, so as to improve both subject competence and linguistic ability

Photovoltaic Technology Development in China

Through almost 30 years effort on developing photovoltaic technics, China has possessed certain technical level and foundation. As of the end of 1994, many solar cell factories were built up such as in Kunming, Kaifeng, Ningbo. Shenzhen, Harbin etc. with a total production capability of 4500 kW per year, in which single-crystal silicon cells 3500 kW, non-crystal

Adaptive Predefined-Time Backstepping Control for Grid Connected Photovoltaic Inverter

The system performance of grid-connected photovoltaic(PV)has a serious impact on the grid stability.To improve the control performance and shorten the convergence time,a predefined-time controller based on backstepping technology and dynamic surface control is formulated for the inverter in the grid-connected photovoltaic.The time-varying tuning functions are introduced into state-tracking errors to realize the predefined-time control effect.To address the“computational explosion problem”in the design process of backstepping control,dynamic surface control is adopted to avoid the analytical calculations of virtual control.The disturbances of the PV system are estimated and compensated by adaptive laws.The control parameters are chosen and the global stability of the closed-loop is ensured by Lyapunov conditions.Simulation results confirm the effectiveness of the proposed controller and ensure the predefined time control in the photovoltaic inverter.

Applications of Ultrasonic Detection Technology in Bridge Concrete Pile Foundation Detection

In this paper,the application strategy of ultrasonic detection technology in the detection of concrete foundation piles is analyzed using a construction project as an example.It includes a basic overview of the project,an overview of ultrasonic testing technology in bridge concrete pile foundation testing,and an analysis of its practical application in the concrete pile foundation testing of this project.The objective of this analysis is to provide some reference for the application of ultrasonic testing technology and the improvement of the quality of bridge concrete pile foundation testing.

New Approach to Lightning Strike Risk Assessment of Wind Farm

In the past,lightning strike risk assessment of buildings mainly referred to the Protection against Lightning—Part 2:Risk Management(IEC 62305-2-2010)based on protection angle method.Lightning strike risk assessment of wind farms was conducted according to the Lightning Protection for Wind Energy System(IEC 61400-24-2019),which proposed the method of lightning strike risk assessment for wind turbine.In fact,the basic idea of the two is the same,that is,the source of the lightning strike wind turbine is transformed from the former S1-S4 to the latter N D-N DJ.According to the above method,wind farm was evaluated,and it has been proved that the practice can not achieve good results.After 2018,China has issued the Guide to Evaluation of Lightning Protection Technology in Buildings(T/GZLY 3-2022)and the Technical Specifications for Lightning Interception in Forest Areas(T/LYCY 4062-2024)based on semicircle protection,in which the source of risk defined by lightning point was closer to the reality,highly targeted and effective.Taking offshore wind farm as an example,this paper introduced a new method of establishing six evaluation indicators to determine the risk level according to the principle of compliance and the new protection technology of semi-circular method,which can be used as a reference for technical personnel.

SystemView仿真技术与通信原理教学整合的实践与探索

介绍了数字信号的基带传输系统模型,运用SystemView软件对基带传输系统信道接收输入、滤波输出及抽样判决等模块的时域波形、眼图进行实验仿真,研究了基带传输系统的性能及信道对信号传输的影响.结果表明,该软件的动态模拟分析、可视性和交互性功能提高了学生的学习能动性,培养了学生的抽象思维能力及创新意识,是通信系统教学、研究和设计的强有力工具.

Materials genome engineering accelerates the research and development of organic and perovskite photovoltaics

The emerging photovoltaic(PV)technologies,such as organic and perovskite PVs,have the characteristics of complex compositions and processing,resulting in a large multidimensional parameter space for the development and optimization of the technologies.Traditional manual methods are time-consuming and laborintensive in screening and optimizing material properties.Materials genome engineering(MGE)advances an innovative approach that combines efficient experimentation,big database and artificial intelligence(AI)algorithms to accelerate materials research and development.High-throughput(HT)research platforms perform multidimensional experimental tasks rapidly,providing a large amount of reliable and consistent data for the creation of materials databases.Therefore,the development of novel experimental methods combining HT and AI can accelerate materials design and application,which is beneficial for establishing material-processing-property relationships and overcoming bottlenecks in the development of emerging PV technologies.This review introduces the key technologies involved in MGE and overviews the accelerating role of MGE in the field of organic and perovskite PVs.