bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative Analysis of Two Methods of Natural Gas Demand Forecasting
Authors: Min Jingjing , Dong Yan , Wu Fang , Li Naijie , Wang Hua
Published: January 2021

Based on the monthly dataset of natural gas demand and meteorological factors in heating season (November to next March) of Beijing from 2002 to 2013, an analysis of meteorological condition of natural gas fluctuation is done, which used by Empirical Mode Decomposition (EMD) and statistical correlation methods. A novel intelligent prediction model (EMD_BP) of natural gas demand in heating season via EMD and Back Propagation (BP) neural network algorithm is proposed. In addition, we adopt a prediction model only using BP neural network algorithm compare to the above combine method. The results are as follows, (1) EMD method is a better approach to decompose the social demand and meteorological demand of natural gas. (2) There is a close affinity between natural gas demand and meteorological factors in heating season. The meteorological demand of natural gas is significantly negatively correlated with the mean temperature (also minimum temperature, maximum temperature and negative accumulated temperature), but significantly positively correlated with rainfall and low temperature (<-8°C) days. (3) Comparing with BP model, EMD_BP model can accurately fit the changing tendency of natural gas time series. The results show that the EMD_BP prediction model has better applicability and extensive popular prospect.
Variation in anthocyanins of different varieties of purple carrots
Authors: Ma Jie , Lin Peixing , Chen Chunyan , Ma Jun , Ma Wei , Wu Meiling , Sun Bo
Published: January 2021

The composition and content of anthocyanins were investigated in nine varieties of purple carrots to reveal the diversity of the anthocyanins among different varieties of purple carrots. The results showed the significant differences of the composition and content of anthocyanins were found between nine varieties of purple carrots. Five anthocyanins were detected in purple carrots, including cyanidin 3-xylosyl(glucosyl), cyanidin 3-xylosylgalactoside, cyanidin 3-xylosyl (sinapoylglucosyl)galactoside, cyanidin 3-xylosyl(feruloylglucosyl)galactoside, and cyanidin 3-xylosyl(coumaroylglucosyl)galactoside. Only four of the five anthocyanins were detected in Caohaihong, Zhongzidan, and Yanzi, whereas 3-xylosyl(coumaroylglucosyl)galactoside were not detected. The highest content of total anthocyanins was found in Tianzi. In addition, the highest contents of individual anthocyanins except for cyanidin 3-xylosyl(sinapoylglucosyl)galactoside, were also in Tianzi, and the highest content of 3-xylosyl(sinapoylglucosyl)galactoside was found in Zishengzi. In summary, these findings provide a theoretical reference for the scientific consumption and a foundation for the further study of purple carrots in the future.
Research on Optimal Algorithm for Time-domain Synthesis of Shock Response Spectrum Based on Continuous Second Derivative
Authors: Song Wei , Wang Ru , Lin Pengting , Liu Mi , Wu Jianchao , Zhang Bolin , Gu Yi , Xie Pengfei
Published: January 2021

Aerospace power supply and distribution products must predict the shock response based on the shock boundary conditions to determine the mechanical design safety factor. In this paper, the SRS of a typical product is used as an input condition, and a damped-sine discrete wave is used to synthesize an equivalent discrete time-domain sequence for simulation calculation. In order to improve the calculation efficiency, a low-sampling frequency time-domain sequence optimization algorithm based on continuous second derivative is proposed; through calculation comparison and verification, the algorithm can effectively improve the simulation operation efficiency, and the response prediction accuracy can meet the allowable requirements, which provides a new idea for products’ SRS calculation.
Study on the Influence of Risk Factors in China’s Photovoltaic Industry
Authors: Huang Shasha
Published: January 2021

The adjustment and transformation of energy structure is encountered as a common problem of the world. With the deepening globalization, Photovoltaic energy as the clean and renewable energy occupies an important position in the future energy structure. The short-term explosive growth promotes the rapid growth of China’s photovoltaic industry as one of the largest photovoltaic producer and application market in the world. Due to the short development life and insufficient industry precipitation, the unstable industrial foundation is vulnerable to industrial risk impact. Therefore, to predict the internal and external risks of the industry in advance can effectively prevent or mitigate the impact of risks. By collating and summarizing the disclosure information of significant events and risk factors in the prospectus of Chinese photovoltaic listed companies, this paper identifies and analyzes the main factors faced in the development of photovoltaic industry, and put forward relevant suggestions for risk prevention and control of photovoltaic industry.
Acquisition of missile fault diagnosis knowledge based on incomplete information of flow graph
Authors: Liu Zhaozheng , Xiao Mingqing , Zhu Haizhen , Li Jianfeng
Published: January 2021

Aiming at the problem of missing information and incomplete information in missile fault diagnosis, a method of acquiring missile fault diagnosis knowledge based on flow graph is proposed. Firstly, the fault feature information is extracted, and the fault diagnosis knowledge is classified by using the feature relationship to obtain a set of fault diagnosis examples under the same feature relationship. Then, the flow graph of incomplete fault diagnosis is established, and the confidence level and coverage level between each node are expressed. The knowledge acquisition framework of missile fault diagnosis is constructed. Finally, combining with the case analysis, it is verified that the fault diagnosis knowledge acquisition method has a good intuition, which provides an effective reference for missile fault diagnosis.
A Novel Initial Value Prediction of Curve-Fitting Algorithm for Single-Diode Model of Photovoltaic Modules
Authors: Chen Dong , Zhang Shishun
Published: January 2021

In this paper a new initial value prediction of curve-fitting algorithm is presented for extracting the parameters of the single-diode model. Before extracting the parameters of the single-diode model of Photovoltaic (PV) modules, a reform of the equation of the single-diode model has been presented for improving the accuracy of the Single-diode model. And the biggest advantage of the algorithm is the prediction of initial value where Newton-Raphson method utilized to seek the root of initial value objective function. Also, Gauss-Newton iteration method have been applied to seek the optimal value of the algorithm—the least square nonlinear multiple regression. Test on two classic case studies and operational PV cells and modules, the proposed algorithm exhibits substantial improvement in terms of fitting accuracy, where the root-mean-square error is lower than other methods, and reliabilities for practical applications including different types and materials. With these, the proposed method is envisaged to be valuable for practical applications, in which accuracy of the single-diode model is of prime concern.
Research on the Forming Method of Lightweight Body and Parts
Authors: Ye Pengxiang , Zhou Wencan , Zhao Chaohui , Wang Hui
Published: January 2021

In recent years, with the diversified development of various scientific research competitions, undergraduate competitions such as the Formula Student Car Race have gradually become regular and high-level. The various parts of the car must be updated and optimized before each race. Among them, the change of the load-bearing frame and the lightweight of parts are particularly important. Therefore, how to reduce the weight of the car, improve the torsional stiffness and mechanical performance of the car by changing the body state, so that the car has better acceleration, braking and handling performance, has become an urgent problem that needs to be solved. Then started research on this.
Research on Test and Evaluation Technology of Hybrid Power Unit
Authors: Chen Bin , Yan Wensen , Wu Shiyu , Liu Zhiyan , Yan Yi
Published: January 2021

With the adjustment of the strategic planning of China's automobile industry, the national policy strongly supports the development and large-scale application of hybrid power technology, but there is no guidance document on the testing and evaluation standards of hybrid power units. In this paper, the current situation of testing and evaluation technology of hybrid power units at home and abroad is analyzed in detail, and combined with the working characteristics of hybrid power units, the testing and evaluation methods that are more in line with the working characteristics of hybrid power units are put forward. They are the individual test of hybrid power unit parts, the test method of independent control of engine load and motor load, and the test method of total load control of hybrid power unit.
Research on Thermal Management System of Liquid Direct Contact Battery
Authors: Yan Yi , Xie Xin , Luo Jun
Published: January 2021

This paper proposes a thermal management system based on liquid direct contact with battery. The paper first uses the principles of heat transfer and computational fluid dynamics to establish a thermal model for single cells and 48V battery module, the performance of thermal management system which liquid indirect contact with battery and thermal management system which liquid direct contact with battery are compared and analyzed by simulation. The results show that the latter is better than the former in battery temperature rise control and single cell temperature consistency control, and has good application and promotion value.
Power Based Open Phase Condition Detection Scheme
Authors: Du Yushi , Tan Weipu
Published: January 2021

Open phase condition can occur in all types of power plants and substations, of which the detection and treatment measures are beginning to be required in the design standards of nuclear power plants. Operation experience shows that when open phase condition occurs on the primary side of the transformer, especially under light and no-load conditions, the traditional protection device based on sequence components cannot reliably operate, and the safety equipment that is used to isolate station auxiliaray transformer will not work properly, which leads to the failure of safe bus automatically transfered to a stanby power source. This situation posts great threats to the safe operation of nuclear power plants. This article systematically analyzes the difficulties in open-phase detection and the change in electrical quantities after open phase fault, and more importantly, focuses on the analysis of the power characteristics after the fault, based on which a new open phase detection scheme for nuclear power plants is proposed. It can also be applied to other types of power plants. The method and its feasibility are verified on PSCAD simulation software. The paper provides a new idea for the detection of open phase fault.
Application of Sludge Coupling Power Generation Technology in Coal-fired Power Plant
Authors: Liu Jinglong , Wang Shouen , Wang Jiaxin , Hou Fanjun , Duan Chuanjun , Zhang Xudong , Zhao Zhonghua , Cui Fuxing , Liu Ke , Wang Haichao , Hu Zhihong , Yang Xingsen
Published: January 2021

The coal quality characteristics of urban sludge were analyzed, and three types of coal-sludge-coupled power generation technologies were introduced, including direct sludge mixing, flue gas direct drying sludge and steam indirect drying sludge coupling power generation. Three types of sludge coupling power generation technologies in coal-fired power plant were introduced, including direct sludge blending process, sludge blending after drying directly by flue gas and indirectly by steam. The control values of sludge blending ratio and moisture content after sludge drying are analyzed, and it is considered that the direct sludge blending ratio should be controlled within 5%. The moisture content after sludge drying should be controlled at 30-40% and the blending ratio should be controlled within 10%. The influence of sludge blending on the operation of the unit is analyzed. The operation of coal-fired boiler is stable, the quality of fly ash and slag has little change, and the emission of pollutants and heavy metals reaches the standard if the proportion of sludge mixed with combustion is controlled within 10%.
Research on Large-scale Cable Intelligent Laying Technology Based on Graph Theory
Authors: Wu Dongxun , Kong Xiangmin , Liu Jiwu , Ge Aixin
Published: January 2021

Power cables, as the most important power transmission medium for indoor substations in urban centres, are important factors that affect the safety, reliability, flexibility and economy of substations. It is important to study the substation cable laying schemes to study the technical and economic schemes of substation construction. component. Aiming at the goal of achieving the best technical and economical solution for cable laying in substations, by combing the statistics of the total station cable quantity and optimizing the cable laying path in combination with the plane layout, using three-dimensional software, a model for the cable laying of each interval power distribution device was established to complete Three-dimensional visual simulation of cable laying at a station, accurate design of cable laying path, verification of collision, simulation of construction work surface, optimization of cable laying path and facilities, and optimization of cable outbound methods in conjunction with planning requirements. Finally, a cable laying optimization design plan for smooth cable connection, safe construction and operation, convenient expansion, and economical saving can be formed, which can save the cable laying investment in the station.
Deformation analysis of underground powerhouse of a large hydropower station based on FLAC3D
Authors: Ma Shuai , Huang Taosheng , Bao Xiaojun , Wang Zhiyuan , Zhang Haotian , Liu Gao
Published: January 2021

Aiming at the deformation characteristics of surrounding rocks in underground powerhouse area of a hydropower station in Western China, the finite difference method is used for numerical calculation, and a assistant modeling software is used to realize the refined modeling of complex surface, which effectively improves the simulation accuracy. The results show that the stress level of surrounding rocks is low, the deformation of surrounding rocks is small, and the surrounding rocks is basically stable. However, the plastic zone of surrounding rocks has the trend of transfixion, so it is necessary to adjust the spacing of powerhouse.
Big Data Analysis Supports the Research and Pilot Application of Distribution Network Planning Technology
Authors: Chen Jing , Shi Weiwei , Liu Ye , Chen Quan , Huang Pingfa , Li Jiaying
Published: January 2021

The construction of the enterprise data center has met the automatic access of the massive data generated by the operation and management of the distribution network, and realized the integration and unification of the professional data of dispatching, operation inspection, and marketing, providing big data technology to support the planning and management of the distribution network The application of new technical conditions such as broadband carrier has greatly improved the authenticity, reliability and timeliness of big data in the distribution network. Through the design of distribution network monitoring and early warning, diagnosis management, quality assessment, portrait research, power outage optimization, load forecasting and other intelligent application models, the accurate processing of distribution data is realized, and the state of the distribution network can be accurately evaluated. Provide technical support for grid structure optimization. Based on this research background, papers, articles have studied and proposed big data-based distribution network planning, planning auxiliary decision-making system: Based on unified technical principles, a unified planning platform is adopted to realize unified project construction. Practice shows that the plan, the auxiliary decision-making system has improved the quality of planning scheme preparation, improved the review effect, and raised the lean level of investment decision-making.
Reliability Parameter Optimization of Electromagnetic Relay for Aerospace Products Based on 3D Thermal Stress Field
Authors: Mu Cheng , Song Wei , Hui Tianli
Published: January 2021

The reliability of thermal and solid coupling relay is an important factor in aerospace products. A refined model based on the internal constitutive characteristics of the device is established, and the thermal solid coupling relationship curve is established. The three-dimensional temperature field and thermal stress field are analyzed by using the finite element analysis software ANSYS. Through the simulation of the thermal field and thermal stress field under different parameters, the design factors affecting the internal thermal distribution of the device are preliminarily analyzed, which provides the parameter basis for the reliability optimization design of the relay.
Reliability analysis of multistage transmission system with coupling uncertainties
Authors: Wang Yuehua , Xiong Xin , Hu Xiong
Published: January 2021

The coupling uncertainties have already become the greatest difficulty in assessing the reliability of multistage transmission systems. A new reliability assessment method of rotor system with uncertainties is proposed here. The probability density functions (PDF) of the state functions are re-derived by introducing the divergence control parameter of uncertainty from nonparametric modeling method and the Lagrange multipliers involved are calculated by the Sigel function method. Then, the joint PDF of all state functions is calculated so that the reliability prediction of multistage systems can be effectively carried out. Both the coupling uncertainties and the intensity of uncertainties are formulated in the PDF of the state functions. Furthermore, the short-period prediction method is improved to avoid wrong judgments caused by excessive neighbor radius. Numerical simulation suggests a reference for which degree of uncertainty can be accepted. It’s very helpful to predict the evolution of operation status and avoid the occurrence of faults.
Research on Dynamic Response Time Test Method for Reactive Power Compensation Device
Authors: Zhou Yuan , Cong Lin , Liu Ya , Yin Huanhuan , Shi Fengshuo , Pan Yong
Published: January 2021

With a large number of applications of fast impact load equipment, the power quality of power grid is increasingly affected. During the actual inspection process of enterprise production and inspection organization, we find that there are still shortcomings in GB/T15576-2008 standard, so we need to study and perfect the dynamic response time test method of reactive power compensation device. In this paper, the input mode of switching switch, the processing speed of controller and the effect of operation method on the dynamic response time are analyzed, and a new dynamic response time test method is proposed. The application of electronic load in the dynamic response time test can greatly improve the accuracy of the test.
Research and Analysis of the Influence of Power Carrier Communication on Smart Meter
Authors: Li Xi , Hua Shubei , Sun Jiangfeng
Published: January 2021

Analyze and study the impact of power carrier communication on smart energy meters, and analyze the measurement function, timing function, storage function and carrier communication function of smart energy meters through various bandwidth, frequency and intensity of carrier communication impact tests Whether the various functions are affected, and provide data support for the in-depth study of the energy meter detection method and operating environment.
Research on the Integrated Application of 3D Design and Project Cost based on Digital Power Grid
Authors: Zhang Hengwu , Yan Kehui , Ma Xiaofeng , Li Jinming , Fang Peng
Published: January 2021

In order to enhance the dizitization and intelligence of the field of power grid, this paper presents an integration theory between 3D design and the project cost. Based on the standard of the digitization power grid 3D design model, this paper researches on the standard quota and list in the field of budget, and puts forward a set of mapping rules between them. Then, the paper develops a 3D design intelligent computing application platform integrating 3D design model data analysis and storage, lightweight 3D visualization, quantity analysis and project quantity output. Taking the actual line project and substation project in Hunan province of China as examples, the extraction process of substation and line quantity is realized respectively, and the computability of the extraction results is deeply analyzed. The experiments reveal the practical significance of the integration theory between 3D design and project cost.
Research on intelligent recognition and encryption algorithm of network big data image
Authors: Qu Jubao
Published: January 2021

In view of the identification and encryption of massive network information in the era of big data, this paper proposes to use intelligent image recognition technology to analyze the required information, then classify it according to the big data clustering method, and use pseudo pixel encryption algorithm for multiple encryption. The simulation results show that the algorithm has high recognition rate, good encryption effect, strong anti-interference ability and good ability to protect network image information.
Research on the impact of demand response programs in day ahead market on the oligarchs in the electricity market
Authors: Gu Huijie , Hu Rong , He Xiqi , Zhou Huafeng
Published: January 2021

In order to study the influence of different types of demand response on the members of the electricity market in the market, a multi-agent model is used to study the behavioral strategies of independent market oligarchs in the electricity market in the day-ahead market, and the security-constrained unit commitment model is used to simulate specific market transactions. First, a demand response model was established, and the relationship between consumer profit and cost was determined using Taylor series expansion. Then the characteristics of the oligopoly market were analyzed, and a market clearing model by using a commitment model of security-constrained units was established, with the objective of maximizing agency profit, and including operation constraints. Finally, the IEEE6 node system was used for simulation to analyze the influence of different types of demand response behaviors on oligarchs and demonstrate the effectiveness of the model.
Research on New Energy Internet Socket and Power Management Platform System
Authors: Wang Zhaojun , He Yuhan , Li Xiao , Zhao Xi , Guo Hongxia , Guo Hongmei , Wang Zhelong , Liu Lijun , Ren Dawei , Liu Zhimei
Published: January 2021

Study the new energy internet socket and electricity management platform system. Develop and research new energy internet sockets, adopt new energy internet socket system, combine engineering product technology and energy management technology to realize intelligent energy management. Use self-service electricity management platform, adopt Internet of Things, cloud computing, big data technology to realize nationwide self-service electricity charging management model.
Power User Taging System Based on Micro-service
Authors: Zhang Bo , Liu Yin , Zuo Songlin , Liu Huizhou , Liang Xiaowei , Cao Youxia , Chen Yan , Zhang Wen , Yuan Bao , OuYang Hong
Published: January 2021

With the rapid development of the electronic channel of State Grid Corporation of China, the electric power user taging system, one of the back-end support systems of the electronic channel, is also expanding. In this paper, a micro-service-based power user taging system is proposed, and the micro-service function requirement analysis is introduced. The micro-service of the electric power user taging system designed in this paper run independently to meet the needs of daily operation, update and expansion of the application.
Research on Informatization Construction of Electric Power Communication Network under Smart Grid
Authors: Zhuang Yan , Xu Jie , Yuan Hui , Dong Liang , Guo Yue , Zhang Yintie
Published: January 2021

This article analyzes the current situation and existing problems of the regional power communication network based on the theory of power communication technology, and then realizes the optimization design of the power communication integrated network system, including planning goals, communication cables, power communication transmission network and communication business network construction, and finally comprehensive Analyse the effect of the optimization design of the power communication integrated network system. Through the test of the power communication integrated network system, it is shown that the optimized network system can effectively meet the requirements of the unified construction of the prefectures and counties, and can also improve the reliability of the regional data network and the disaster tolerance system of the existing data network Demand to improve the stability of the system during operation.
Effect of Non-metallic Inclusions on Subsurface Stress and Fatigue Life of High-speed Railway Bearings
Authors: Ma Canyang , Zhang Gang , Wang Yongwu , Zhang Zhenqiang , Ren Zhongming
Published: January 2021

The contact simulation model of high-speed railway train axle box bearing is simplified into a two-dimensional plane with an elastic semi-infinite body subjected to semi-elliptical cylindrical compressive stress in one direction. The ANSYS software was used to solve the effects of single inclusion size, the depth of the contact surface and the elastic modulus on dynamic shear stress and Von Mises stress of high-iron bearing subsurface, and compared with the calculation results of bearing material uniformity assumption. Using the modified Basquin equation, the relevant assumptions are made. The maximum Von Mises stress is used as the key stress for fatigue life calculation. The bearing fatigue life calculation method is established to study the influence of the inclusion size, the depth of the contact surface and the elastic modulus on the bearing fatigue life.
Effect of xylose on the biological activity, physical property and antioxidant capacity of dried Aronia melanocarpa
Authors: Sun Wanting , Wang Sai , Zhang Jun , Sheng Guihua , Wang Meng , Chen Xuanhong , Dong Leichao , Zhou Quancheng
Published: January 2021

This research investigated effect of xylose on drying Aronia melanocarpa using response surface methodology (RSM) to produce the optimal drying conditions for high bioactive compounds. The conditions were drying temperature 58.70°C, drying time 8 h 48 min, and xylose solution concentration 50.70%. Subsequently, effects of drying conditions on physical properties of dried Aronia melanocarpa (DAM) were evaluated in Scanning electron microscope (SEM), Fourier transform infrared spectrum (FTIR), X-ray diffraction (XRD) and Different scanning calorimetry (DSC). The physical properties showed that DAM with xylose changed from amorphous to crystalline during drying process, which would extend the shelf life of DAM. Besides that, the physical properties results also showed that a Maillard reaction occurred during drying, which explained the improved antioxidant capacity of DAM with xylose. The results showed that xylose could reduce spoilage, prolong shelf-life of DAM, and indicated its use as a potential functional ingredients in the food industry.
Construction of Electronic Waste Recovery and Utilization System from the Perspective of Circular Economy
Authors: Chen Caihong
Published: January 2021

There is a wide variety of electronic waste, including refrigerators, air conditioners, washing machines, televisions, computers and other knock-out products. E-waste, if properly recycled, will release significant economic, resource and ecological benefits. However, there is a situation that illegal recycling workshops occupy a dominant position in the e-waste recycling market in China, and many formal enterprises' recycling and processing capacity cannot be effectively utilized and played. Based on the concept of "reduction -- recycling and processing -- recycling", this paper comprehensively analyzes the recycling, processing and utilization of electronic waste, and systematically constructs the recycling and utilization system of electronic waste, which is of great significance for protecting urban ecological environment and realizing circular economy.
Molecular dynamics simulation study on viscosity of silver nanoparticle printing ink
Authors: Li Sha , Gao Lu , Liu Hao
Published: January 2021

Ink-jet printing and ink direct writing technologies show great advantages in printing electronics and structural customization of flexible materials. The viscosity of the ink will affect the flow rate of the working medium, is an important parameter in the process of deposition. In this paper, the research status of metal particle printing ink and its rheological properties were briefly introduced. Then, water-based silver nanoparticle ink was selected as the research object, and the base liquid system was established with the TIP4P/2005 water model. The shear viscosity of the base liquid was calculated, and the accuracy of the water model in predicting the viscosity was verified. Considering the size of the silver nanoparticles, volume fraction and temperature of the three factors on the viscosity, the effects of the equilibrium molecular dynamics based on Green - Kubo formula viscosity calculation method under different conditions was calculated respectively set shear viscosity of the ink, the conclusion is temperature, volume fraction and particle size on the shear viscosity value, viscosity values associated with negative temperature, volume fraction and the viscosity value is a positive correlation, and particle size has less effect on the viscosity, particle decreases, and the viscosity value increased slightly.
Neutron shielding properties of TPX/B4C composites based on Monte Carlo method
Authors: Chen Zhigang , Gong Junjun , Jie Shuai
Published: January 2021

As the key and difficult point of shielding protection, many domestic and foreign scholars have carried out a lot of experimental research on neutron shielding materials. In this paper, the research progress, advantages and disadvantages of common neutron shielding materials are discussed, and the neutron shielding process of TPX/B4C composites is simulated by Monte Carlo method, and the results are compared with the Boron polyethylene, lead boron polyethylene, aluminum based boron carbide mentioned in the literature. Based on the simulation results, it is concluded that the thermal neutron absorption rate of TPX/B4C composites with the thickness of 1cm is 98.3%, the fast neutron shielding rate of 1MeV is 1.457, and the neutron shielding reduction factor and neutron dose reduction factor of americium beryllium neutron source are obviously better than the other three materials. The simulation results show that TPX/B4C Composite can be used as a new kind of high temperature neutron shielding material.
Construction for the Smart Old-age Care in an Age of Longevity: A Literature Review
Authors: Zhang Xinyue
Published: January 2021

The deepening of the aging population has increased the pressure on social security and public services, affected social vitality, innovation power, and potential economic growth rate. Fortunately, with the development of science, the "Smart City" is also being built, so how to utilize intelligent technology to deal with the aging issue is a worthy orientation. This literature review integrates the aging status quo and countermeasures in typical countries, analyzes the current problems of Smart Old-age Care system in various aspects, and proposes phased recommendations (Smart C&A homes, Smart Home, Smart Community, Smart City) according to different aging degrees, thereby offering new ideas and directions for the Longevity related topics in the future.
Research on Efficiency of Improved IFAS Process in Treating Rural Sewage
Authors: Xue Tonglai , Han Fei , Wang Suzhong , Sun Dehui
Published: January 2021

Based on researches of a wastewater treatment plant for rural sewage treatment in Tongzhou District, Beijing city, efficiency of IFAS process was studied to support its broad-wide use in rural area. The results showed that, for the influents with COD, ammonia, TN and TP levels of 60-203mg/L, 9.5-40mg/L, 16-45mg/L and 1.2-4.7mg/L, highest removals of 91%, 98%, 78% and 93% can be obtained with levels of effluents below than 40mg/L, 1.5mg/L, 15mg/L and 1.0mg/L. Removals of the contaminants were low under low temperatures in winters.
Research Progress on Water Purification Efficiency of Multiplant Combination in Constructed Wetland
Authors: Li Yujie , Cheng Cai , Li Xiaona
Published: January 2021

The constructed wetland has the powerful purification sewage function, the plant is the core of the constructed wetland, playing the vital role in the water body decontamination restoration process. The common plant species in constructed wetland were summarized and classified (floating plants, floating plants, emergent plants, submerged plants, ornamental plants and economical plants). The factors and basic principles that need to be considered when configuring a variety of plants in a constructed wetland combination for decontamination are described, including decontamination purification capacity, environmental adaptability, and the economic and ornamental value of multiple plants, etc. The current research contents and directions are emphatically reviewed, focusing on the functions and efficacy of nitrogen and phosphorus removal and purification of heavy metal wastewater by various plant combinations in constructed wetlands. It is pointed out that there are many shortcomings in the research of decontamination process of many plants, such as imperfect planting standards, lacking of research on the mechanism of decontamination among various plants, between various plants and substrates, and root microorganisms. Many kinds of plants have not been dealt with properly after harvesting, resulting in waste of resources and secondary pollution and other problems. Therefore, in the future research on the purification and restoration of various plant waters in constructed wetlands, a universally applicable planting specification for various plants in constructed wetlands should be formulated; exploring and analyzing how various plants and various plants interact with substrates and root microorganisms function to achieve water purification and repair effects; In addition, fuel ethanol technology, Biogas fermentation and biomass solid fuel technology should be developed to realize the resource reuse of wetland plants and improve the purification efficiency of wetland plants.
Professional Service and Environmental Protection of Fujian SMEs
Authors: Lin Renzao , Yuan Xiaojian
Published: January 2021

The development of SMEs is affected by their own conditions, and the awareness of environmental protection is weak. Many of the problems encountered by small and medium-sized enterprises in the process of protecting the environment cannot be solved by enterprises. Enterprises are affected by their own limited resources and are not paying enough attention to environmental protection. The society needs to provide professional services, and the government needs to transform its functions to establish a service-oriented government and build a new professional service system to promote SMEs to carry out environmental protection.
Separate tensile tests of ACSR at high and low temperatures
Authors: You Yi , Zhang Long , Yan Zhitao , Nie Xiaochun , Wang Feng
Published: January 2021

In order to ensure the accuracy of the test and avoid the errors caused by the slip between the steel and aluminum materials, the mechanical properties of ACSR at different temperatures were studied by the method of separate experiment of steel strand and aluminum strand. The test results show that with the increase of temperature, the elastic modulus of aluminum strand and steel strand decreases, but the elastic modulus of steel strand decreases more. There is no obvious strengthening stage and yield stage for aluminum strand, but obvious elastic stage, yield stage, strengthening stage and local necking stage for steel strand. The failure parts of aluminum strands are concentrated in the position of 1 / 2 ∼ 1 / 3 of the samples, and the failure parts of each strand tend to develop along the twisting direction. The failure position of the steel strand is basically in the same cross section of the middle area of the sample. The experimental results of steel and aluminum strands are basically consistent with the results of the whole steel reinforced aluminum strand, which proves that the experimental method is feasible.
Analysis of the construction of sports and cultural heritage corridors for ethnic minorities in the context of the “One Belt, One Road” strategy
Authors: Wang Youfeng
Published: January 2021

Minority sports cultural heritage is an important part of China's traditional ethnic culture, for which the construction of heritage corridors is crucial, playing an important role in protecting cultural resources and promoting regional economic development. This paper examines this in depth and discusses the construction of the heritage corridor in relation to the actual situation of the Yunnan-Vietnam Railway minority sports culture.
Underlying Communication Model of Joint Test Environment Based on Publish-Subscribe Mechanism
Authors: Dong Zhihua , Jiang xiaodong , Liu Heng , Hua Binbin
Published: January 2021

Joint Test Inter-Connection Architecture (JTICA) contains application layer, simulation layer, and communication layer from top to bottom, which can construct a shared test space through connecting live, virtual, constructive simulation resources. Data distribution service is used as communication layer protocol, which can provide joint test with high real-time and large throughput. Heterogeneous systems and interactive models need to been mapped into equivalent entities in communication layer to set up the relationship between heterogeneous systems based on data-centric publish subscribe mechanism. Then heterogeneous systems are mapped into DomainParticipant, interactive models mapped into Topics, in communication layer. There are two map relationships between heterogeneous systems and DomainParticipants including “one-to-one” and “one-to-many”, which affect the communication efficiency of joint test. Communication delay of Prototype systems designed based on different map relationship are compared, and the result is referred to when selecting map relationship.
Physiological Response of Cosmos Bipinnata Cav under Lead Stress
Authors: Liang Jian , Yang Weifei , Rong Dengxian
Published: January 2021

In this paper, Cosmos bipinnata Cav was studied and analyzed. by comparing the growth of Cosmos bipinnata Cav under different Pd waste residue environments, it was concluded that Cosmos bipinnata Cav was affected under the stress of heavy metal Pd. In the experiment, mainly through the changes of soluble sugars, soluble proteins, malondialdehyde and so on in plants in Pd environment, and at the same time, based on finding out the types of changes, the law of stress influence of Cosmos bipinnata Cav in the waste residue of heavy metal Pd was analyzed and studied.
Research on application of zeolite in air purification of ship cabins
Authors: Yang Jiandong , Ma Chao , Xiao Hairui , Zhou Yunling
Published: January 2021

It’s necessary to equip the ship cabins with suitable air purification device which can ensure the ship’s air quality without affecting the physical and mental health of the crew living in the limited space of a ship during ocean voyage. In this paper, zeolite’s characteristics and application in air purification are introduced, and three different types of air purification filters are designed with zeolite particles as main materials, then three development programs of air purification engineering machine for ship cabins are proposed based on modular design concept. The air-purifying machine models proposed in this paper have been trial-produced and tested, which provides new choices for ship cabins’ air-purifying devices.
Fault diagnosis method of rolling bearing based on EMD-Hilbert envelope spectrum and BPNN
Authors: Wu Tao
Published: January 2021

Rolling bearings are an important component of rotating machinery, and accurate diagnosis of their faults is also very important. This paper proposes a rolling bearing fault diagnosis method combining empirical mode decomposition (EMD)-Hilbert envelope spectrum analysis and BP neural network (BPNN). First, EMD is used to decompose the intrinsic modal function (IMF) component containing the bearing fault feature information from the original vibration signal data of the rolling bearing, and then the IMF component is processed in combination with the Hilbert envelope analysis method to obtain a clear fault feature frequency. The processed fault characteristic frequency is subjected to dimensionality reduction by principal component analysis (PCA) to propose redundant data. Finally, the dimensionality-reduced feature data is input into B PNN to establish a fault diagnosis model. The results show that the rolling bearing fault diagnosis method based on EMD-Hilbert envelope spectrum analysis and BPNN can effectively identify different fault states of rolling bearings.
Research on Building Measurement Accuracy Verification Based on Terrestrial 3D Laser Scanner
Authors: Ling Xiaochun
Published: January 2021

The accuracy of terrestrial 3D laser scanners is mainly determined by the accuracy of ranging and angle measurement. Therefore, the research of horizontal angle accuracy is very important. The current construction industry can develop at the fastest speed because of the advent of many advanced science and technology research and development. The rational application of these science and technology to the construction industry can intuitively display the internal structure and external shape of the building. In front of people, it effectively guarantees the country's economic benefits and the people's property safety. The article studies the influence of distance, incident angle and target color on the accuracy of the scanner during measurement. Using the plane fitting method to analyse the accuracy, a qualitative analysis conclusion is drawn that as t he distance increases, the angle of incidence increases, which will cause the measurement accuracy of the ground 3D laser scanner to decrease.
Preparation and application of oil emulsion adjuvant of animal vaccines containing flavonoid saponins
Authors: Zhang Fen , Zhou Mengmeng , Liu Hongwei , Bi Yutong , Duan Pufan , Zhou Haijun , Chen Xiaoqi , Li Yantao , Qu Xiongwei
Published: January 2021

With the development of immunology, the application of vaccines plays an important role in controlling the epidemic of animal diseases, and the development of adjuvants is particularly important. Immune adjuvant is a kind of non-specific immune enhancer. It can effectively induce long-term and high-efficiency specific immune response and improve the self-protection ability of the body when injected with antigen or in advance. In this paper, a flavonoid saponin extracted from persimmon leaves was added on the basis of traditional oil adjuvant. The animal potency test showed that the oil emulsion adjuvant containing flavonoid saponin was more effective than single use, and could be widely used in the development of animal vaccine.
Design of a filtering car air purifier
Authors: Dong Xue
Published: January 2021

Aiming at serious air pollution in the passenger car, in this paper, a filtering car air purifier is designed. This paper mainly consists of selection of the fan, design of the filter, design of the shell, processing of all parts, assembly of the complete machine, usage, operation process, and usage. Finally, through the detection of the filtering car air purifier designed in this paper, the test shows that this filtering air purifier can remove harmful substances, such as formaldehyde, in the car.
Analysis of the current situation and development direction of Zhengzhou’s planning and construction
Authors: Li Yunfen , Yang Shuai
Published: January 2021

This article analyzes and studies the current status and development direction of Zhengzhou City by using urban management theory, comparative methods and on-the-spot investigation methods. Close to the conclusion. As a new first-tier city, Zhengzhou's development level and planning and construction are not yet mature, and there are still many problems that need to be solved urgently. The results of the study show that the overall provision of public goods in Zhengzhou is uneven and inadequate. Public goods are an obvious material manifestation of whether cities are developed or not. Infrastructure is a major component of public goods. Housing construction is the top priority of the people's livelihood. In response to the housing planning and environmental protection issues in Zhengzhou City, this article puts forward several suggestions: to expand the investment of funds to build affordable housing; to resolve the garbage classification and land layout Environmental issues in Zhengzhou. Environmental protection has always been a key issue in China. Both cities and residents should raise their awareness of environmental protection in order for cities to develop healthily and sustainably. This article has a certain reference role for the urban planning and construction of Zhengzhou City.
Application and Research Based on Advanced Low-Emission Aero-Engine Combustion Chamber Technology in Domestic Large Aircraft
Authors: Zhang Xu
Published: January 2021

The international limits on pollution emissions from civil aviation transportation are becoming more and more stringent. Combustion chambers are the only source of pollution emissions from civil aviation engines. Reducing the amount of pollutant e missions is an important task facing the development of combustion chambers. Low-e mission combustion technology as one of the key technologies of civil aviation engines, it is the core technology that supports the development and market entry of civil aviation engines. In order to study the pressure oscillation characteristics of the low-emission combustion chamber under typical working conditions, the self-excited combustion oscillation characteristic test of the model combustion chamber is carried out. The results show that the local equivalent ratio pulsation is one of the factors that cause combustion instability. By calculating the maximum particle size of the fuel droplets in the secondary atomization state of the fuel, it is found that the change of the fuel droplet size has a direct effect on the local equivalent ratio pulsation at the outlet of the main fuel stage, which causes the amplitude and frequency of the combustion chamber pressure oscillation Variety.