bluuebunny/crossref_metadata_2025_split huggingface dataset:
Opportunistic Maintenance Optimization for Transmission Bays Based on Multistate Markov Process
Authors: Xu Bo , Xu Shenzhi , Zhang Yumin 
Published: September 2019

Abstract
Power equipment usually goes through multiple states during the transition from normal state to the failure state. In order to consider equipment multistate property, an opportunistic maintenance optimization model based on multistate Markov process is proposed considering economic dependence within the transmission bay. This model describe equipment state transition process using the multistate Markov process. And then, opportunistic maintenance strategy between dependent power equipment in a transmission bay is studied. The transmission bay availability is derived considering opportunistic maintenance and scheduled maintenance. Finally, system operation cost is quantified. System operation cost is minimized to optimize equipment maintenance strategies. Numerical studies demonstrate validity of the proposed model.
Fitting algorithm for interferometric spectrum of fiber Fabry-Perot cavity acoustic sensors
Authors: Yu Changkun , Cheng Jin , Tian Yangmeng , Zou Xiaoping 
Published: September 2019

Abstract
Fiber Fabry-Perot cavity acoustic sensors have been widely used in some fields recently due to its advantages such as high sensitivity, resistance to electromagnetic interference, etc. In order to control the performance of the sensors, it is necessary to precisely adjust the cavity length. In order to obtain the cavity length efficiently and accurately, a fitting algorithm for interference spectrum is proposed in this paper. The base of the algorithm is the principle of light interference and the key of the algorithm is to find the peaks and valleys of the interference spectrum. Experimental results show that the algorithm has a high fitting degree.
Method for fitting wind turbine blade airfoil profile with function curve
Authors: Jiang Haibo , Zhao Yunpeng , Cheng Zhongqing 
Published: September 2019

Abstract
This paper analyzed the characteristics of a midline -thickness function, and gave the influence of the change of the constant value in the function on the change of the function graph. A method for fitting a wind turbine blade airfoil profile with a midline -thickness function curve was demonstrated by three examples, and some limitations of this method were pointed out. Studies have shown that the airfoil profile can be generated by using the midline -thickness function. The shape of the airfoil profile can also be changed in the desired direction by adjusting the constant value in the function. As a result, new airfoil profiles can be created, and the airfoil design can be improved. For existing wind turbine airfoil profiles, the midline -thickness function can be used for fitting. The main method is to adjust the constant value in the function to compare with the airfoil profile bitmap. Since the constants have a clear geometric meaning, the fitting process is relatively simple, but there are minor errors.
Matching Analysis of Ship and Marine Engineering Equipment Industry Value in Jiangsu Province
Authors: Shasha Liu , Jie Wu , Junting Zhang , Yu Liang 
Published: September 2019

Abstract
Through the analysis of the correlation between R&D and production links, R&D links and sales links, R&D links and profit links in the overall industry, manufacturing industry and supporting industries of ship and ocean engineering equipment in Jiangsu Province, we get the synergy between R&D and other links. It reveals the dynamic characteristics of the synergy between R&D and other links, clarifies the key development industries and key development links, providing reference for the coordinated development in the different value chains of the ship and ocean engineering equipment industry in Jiangsu Province.
Analysis of Flow Field Characteristics of Unequal Distance Fans
Authors: Zhai Shufeng , Yao Qian , Li Zongtao 
Published: September 2019

Abstract
This paper establishes the simulation model of the unequal-distance fan, obtains the details of the flow field when the fan works by CFD simulation method, and analyses the internal flow field characteristics of the unequal-distance fan from three aspects: streamline trace distribution, pressure distribution and velocity distribution, so as to get the working condition of the fan, which is of great significance for the design and transformation of the fan structure.
Practice and Analysis of a Flushing Method for Lubricating Oil System of Thermal Power Unit
Authors: Junfeng-Qi  , Yuzhu-Zhao  , Maosong-Wu  , Zhengfeng-Wu  
Published: September 2019

Abstract
Lubricating oil system is an important auxiliary system of thermal power unit. The equipment and pipes in the system may have foreign impurities in the process of manufacture, transportation and installation. In order to discharge foreign impurities from the system, it is particularly important to flush the lubricating oil before the unit is officially operated to ensure that the key components such as bearing bush, journal, are not damaged and affected in operation. This paper combines the optimization of the original flushing scheme of the lubricating oil system of a 1000MW unit in China, and introduces the optimized flushing methods and measures. By introducing the establishment of good working practice and experience feedback, it facilitates the follow-up similar work, and also provides a good guarantee for the safe and reliable operation of the unit, and brings good economic benefits.
Vibration Analysis and Dynamic Balance Treatment of Condensate Pump Motor of 390MW Gas Turbine Unit
Authors: Chai Baotong , Zhao Yuzhu , Wu Zhengfeng 
Published: September 2019

Abstract
The on-site vibration test and diagnostic analysis of the condensate pump motor vibration of a 390 MW gas turbine unit in a power plant were carried out. It is considered that the serious imbalance of the rotor of the condensate pump motor is the main cause of the vibration abnormality of the motor. The vibration anomaly is eliminated by the on-site dynamic balance test.
Research and Development of BIM Operation and Maintenance System in Nuclear Power Plant
Authors: Liang Weiqiao , Yang Junyi , Liu Xinping , Wei Jin , Zhang Dong 
Published: September 2019

Abstract
The BIM (Building Information Modeling) operation and maintenance management system of the nuclear power plant has been developed to cope with the security risks in the operation and maintenance process of nuclear power plant, the difficulty in querying the operation and maintenance status, the low work efficiency and the difficulty in statistical analysis of various large-scale operation and maintenance data. Practice has shown that the BIM operation and maintenance management system enhances the safety of the plant; on the other hand, the convenience of the results information query improves the professionalization, refinement and systematization of the nuclear power plant safety and operation management; in that way, the safety management efficiency of nuclear power plants will be comprehensively improved.
Study on Short-Circuit Impedance Characteristics in DN Traction Electric Lines
Authors: Liu Yang , Yin Zijian , Gao Qiang , Tian Xingjun , Yang Xiaoxuan 
Published: September 2019

Abstract
The fault location accuracy of traction electric lines protection device based on impedance characteristics is usually over thousands of meters. To find out the reasons that affect the accuracy of fault location, this paper studies some the key factors including rail potential, feedback current through ground and fault point impedance characteristics of traction electric lines. Then the calculation method of impedance increment and the reason of the location error are found. It is of great significance for the setting calculation and fault location error analysis of the protection system.
Smart Car Based on Open MV Vision System
Authors: Zhang Yawan 
Published: September 2019

Abstract
Modern society is developing rapidly, social informationization, and the degree of science and technology has become higher and higher. The development of intelligence has gradually entered people’s vision, and will eventually become a part of human life in the future. In order to facilitate people’s use, a target tracking method based on Open MV vision system is proposed. The machine vision Open MV module is used to collect image information, and through image information processing, the information is transmitted to the central control chip STM32 core control board. And the various modules that control the car work together. The method can resist the interference of illumination changes, achieve path optimization to a certain extent, and achieve real-time processing under limited computing resources. At the same time, the design is simple and the cost is low. The experimental results have been obtained through experimental tests, and the follow-up of the trolley has been successfully realized. Later, it can be used as a reference for the design of the driverless car and can also be used for the design of the smart car toy.
Research on Noise Control Technology of 10kV Dry Parallel Reactor
Authors: Sheng Hu , Xiaowen Wu , Jiwen Peng , Ling Lu , Hao Cao , Wei Chen , Tienan Li 
Published: September 2019

Abstract
Reactor noise is one of the main noise sources in substations. It has obvious low-frequency noise characteristics and long transmission distance, which has a great impact on the sensitive targets of the acoustical environment at the substation boundary and outside the substation. In order to solve the problem of the boundary noise exceed the emission limits caused by 10 kV dry shunt reactor in a 220kV substation, noise reduction measures using noise barrier are proposed, and the effect of noise reduction is simulated and analyzed based on SoundPLAN software. The test results show that the noise reduction measures adopted can ensure that the noise at substation boundary meets the emission limit requirements.
Causes and Countermeasures for Decrease in Denitration Efficiency and Excessive Ammonia Escape in SCR System of Coal-fired Power Plants
Authors: Qi Xiaohui 
Published: September 2019

Abstract
The good operation of the SCR flue gas denitration system in coal-fired power plants is of great significance to the environment. This paper introduces the denitrification efficiency drop and the ammonia escape exceeding standard in the operation process of a coal-fired power plant denitrification device. According to the actual situation of the plant equipment and the field investigation results, the problem is analyzed in depth, and the test measures for the optimization of ammonia injection are proposed. Through experiments, reducing the NOx concentration distribution of the outlet is to improve the denitration efficiency of the SCR system, at the same time reduce the ammonia escape rate of the denitration outlet, and ensure the safety, continuity and economical stable operation of the unit equipment.
Theoretical and Experimental Research on a novel adsorption refrigerator based on low temperature geoethermal water
Authors: Hu Bing 
Published: September 2019

Abstract
In view of the problems existing in adsorption refrigeration based on low temperature geothermal water, the adsorbent with high mass transfer performance was prepared by carbonization activation method. The specific methods are as follows: firstly, Chinese fir sawdust is immersed in calcium chloride solution, then taken out and dried, and the mixture is carbonized and activated at high temperature to form a porous activated carbon/calcium chloride composite adsorbent, and then expanded graphite is added to enhance the thermal conductivity of the composite adsorbent.The results show that: The proportion of calcium chloride in the composite adsorbent can be significantly increased by carbonization activation method, which makes the composite adsorbent have abundant microporous structure and uniform element distribution. The thermal conductivity of the composite adsorbent can be improved by adding expanded graphite.
Sea surface temperature retrieval from landsat8 thermal infrared remote sensing data in coastal waters
Authors: Fu Jiaoqi , Chen Chao , Ren Huazhong , Zhang Yuhuan , Chu Yanli 
Published: September 2019

Abstract
Since the launch of landsat8, high-quality surface observation data have been acquired. But the corresponding sea surface temperature (SST) products have not been seen. Moreover, the existing SST inversion algorithm do not carefully consider the effect of water vapor on the accuracy. In this study, a new method is proposed for the retrieve of SST from Landsat 8 Thermal Infrared Remote Sensing (TIRS) data based on the variation of atmospheric water vapor content. The steps are briefly described as follows: 1) constructing the SST retrieval model of thermal infrared remote sensing by using the radiation transfer equation with atmospheric profile data (air temperature and pressure); 2) retrieving SST of Zhoushan sea area, China from Landsat 8 TIRS Data; 3) evaluating the accuracy of proposed model by simulation data and AVHRR SST product. The bias and RMSE based on the simulation data are within 0.4 K. The bias and RMSE based on AVHRR SST product are 1.6063 K and 1.8507 K, respectively. The results show that the accurate SST with high spatial resolution could be obtained by using the method.
Research on Magnetic Characteristics of Small UAV for Aeromagnetic Measurement
Authors: Dai Jialong , Meng Lifei , Huang Kui , Xu Chaoqun , Yi Zhong , Xiao Qi , Liu Chaobo , Wang Bin , Zhang Chao , Zhang Shaohua , Li Na , Zhang Yanjing 
Published: September 2019

Abstract
UAV has the characteristics of small size, light weight, low cost, convenient assembly and maintenance, etc. It is suitable for aeromagnetic exploration, mapping, agriculture and forestry plant protection and other fields. Commercial drones, combined with aerospace magnetic measurement with its excellent platform value, can play an important role in small-scale geomagnetic surveying and magnetic anomaly detection in key areas. In the aeromagnetic measurement process of the drone, the small-scale and high-integrated hardware configuration results in a high level of near-field magnetic interference of the drone, which affects the magnetic detection effect. This paper selects a small commercial unmanned aerial vehicle for magnetic characteristics research. The static and dynamic flight magnetic tests of the UAV were carried out in the zero-magnetic laboratory, and the magnetic moment and magnetic field characteristics were analyzed. The experimental results will be used as the data basis for magnetic interference noise reduction in UAV aeromagnetic survey applications.
Effect of the thermal insulation wall under the air-conditioning intermittent operation
Authors: Yuan Meng , Huang Yisheng , He Jiayi , Li Jialun , Xu Ruochen , Hu Wentao , Hou Chaoping 
Published: September 2019

Abstract
With the increasing energy consumption, the status of building energy conservation is paid more and more attention. So how to reduce the energy consumption of envelope becomes a hot spot. Self-insulation wall behaves greatly in energy saving, and this paper proposes a self-insulation wall which is filled Expanding Polystyrene(EPS) into the cavities of the sintered shale bricks with different ration. Besides, the condition of intermittent operation of air conditioner in winter is simulated. The results showed that temperature of the wall increased significantly after filling the EPS, and the wall had a good thermal insulation performance. The thermal insulation wall with 50% EPS is recommended, no matter from the aspect of the economy or of thermal physics. Moreover, intermittent operation which is 1 hour interval and 1 hour working was the idealist mode, because the wall performed the best capacity of insulation under this condition.
Study on the Temporal and Spatial Pattern Differences of Chinese Light Curl Based on DMSP/OLS
Authors: Wang Xiaowei , Cheng Hui 
Published: September 2019

Abstract
Nighttime light data can detect surface gleams that can intuitively reflect human socioeconomic activity. This paper uses the DMSP/OLS nighttime lighting data from 2001 to 2007 to analyze the coupling relationship between regional economic development and nighttime light intensity in China using regression model. The results show that the brightest areas of nighttime light are mainly concentrated in the Beijing-Tianjin-Hebei region, the Yangtze River Delta region, and the Pearl River Delta region. With the change of the year, the brightness of the three regions is brighter year by year, indicating that the economy is more and more developed. The linear regression model of total brightness and GDP of regional light: Y=792.218+0.024X, linear slope is 0.024, indicating a positive correlation trend. The provinces and cities with the highest total brightness of the provinces and cities are Guangdong Province, Shandong Province, and Jiangsu Province, and the lowest provinces and cities are Qinghai Province and Tibet Autonomous Region. The total brightness of regional lights in China’s provinces and cities is well coupled with GDP. The total brightness of regional lights in all provinces and cities is weakened from east to west. The brightness of the 11 provinces in the eastern region is the strongest, including Beijing, Tianjin, Hebei, Liaoning, Shanghai, and Jiangsu, Zhejiang, Fujian, Shandong, Guangdong, Hainan Province. The second most powerful lighting is the eight provinces in the central region including Shanxi, Jilin, Heilongjiang, Anhui, Jiangxi, Henan, Hubei, and Hunan. The weakest lighting is in the western regions of Sichuan, Chongqing, Guizhou, Yunnan, Tibet, Shaanxi, Gansu, Qinghai, Ningxia, Xinjiang, Guangxi, Inner Mongolia and other provinces (cities). In the east of the Hu Huanyong line, the nighttime lighting is higher than the west of the Hu Huanyong line. The eastern part of China’s seven geographical divisions (Shanghai, Jiangsu, Zhejiang, Anhui, Jiangxi, Shandong, Fujian, and Taiwan) has the brightest night lights. The northwestern region (Shaanxi, Gansu, Qinghai, Ningxia Hui Autonomous Region, Xinjiang Uygur Autonomous Region, and Inner Mongolia Autonomous Region) has a weak night light. The brightness information of nighttime remote sensing data selected in this study can reflect the level of regional economic development.
Solving Poisson’s Ratio of Single-Layer Composites Acted by Normal Force with Interface Non-Slip Condition
Authors: Li Yanru , Wang Liqiang , Jiang Haibo 
Published: September 2019

Abstract
In this paper, the stress of the interface between the reinforcement and the matrix of composite is analyzed. According to the basic characteristics that the interface does not slip, the strains of the reinforcement and the matrix along the interface are assumed to be equal. The Poisson’s ratio calculation formula of the single-layer composite acted by normal force is derived. The research indicates that the interface non-silip of the laminate is the basic feature of the composite. Based on this, the elastic properties of the laminate acted by normal force can be directly calculated and analyzed by equal-strain equations; The Poisson’s ratio is not only a function of the Poisson’s ratio and volume fraction of the reinforcement and the matrix, but also a function of the ratio of the elastic modulus of the reinforcement to the elastic modulus of the matrix, but the size of Poisson’s ratio is independent of the size and shape of the reinforcement and matrix.
Comparative Study on Test Methods of Total Coliforms in Domestic Drinking Water
Authors: Shen Qiuhua , Wang Xiaojie , Chen Enfeng , Ma Zhenchao 
Published: September 2019

Abstract
Total coliforms are a group of facultative anaerobic Gram-negative sporeless bacteria that can ferment lactose, produce acid and gas, requiring oxygen. In this paper, it adopts three methods namely multi-tube fermentation method, membrane filter method and paper strip method to make analytic comparison on the total coliforms in drinking water. It also makes comparative study from aspects, i.e. test principle and procedure, scope of application and test result, discusses the advantages and disadvantages of the three methods. According to the result, compared with the traditional fermentation method and the membrane filter method, the paper strip method has the advantages such as simple operation, short test time and high accuracy, etc.
Erosion Characteristics of Electroless Deposited Ni-Fe-P Al-loys in 5% NaOH Slurry
Authors: Cheng Zhengcui , Zhu Shaofeng , Li Yixian 
Published: September 2019

Abstract
Amorphous Ni-Fe-P alloy coating was prepared on thecopper substrate by electroless deposition. Silicon carbide particles were added into the suspension containing 5wt% NaOH to carry out erosion experiments on the coatings with the self-made erosion tester. The experimental results show that, due to the corrosion of the solution on the coating and the impact of SiC particles on the corrosion film and matrix metal, the maximum loss of coating quality occurs when the SiC particle size is 120 μιη at different impact angles. With the increase of impact angle, the mass loss of coating tends to increase. With the increase oftheslurry flow rate, the mass loss of coating increases.
Recovery of Polyols from Polyurethane Foam Wastes by Solvent Decomposition
Authors: Li Qi , Xu Weitao , Xi Enhua , Pang Yanfang , Liu Xiaosheng , Mao An 
Published: September 2019

Abstract
The objective of this study was to investigate the feasibility of recovering the polyols from the polyurethane (PU) foam wastes obtained from automobile shredder residue (ASR) by chemical decomposition using the diethylene glycol (DEG) as the decomposing solvent and sodium hydroxide (NaOH) as the catalyst, respectively. The effects of temperature (180 °C and 210 °C), time (0.5, 1, 1.5, 2, 2.5, and 3 hours), and DEG/FPU weight ratio (2:1, 3:1, and 4:1) on the decomposition reaction and the properties of the recovered polyols were investigated. Higher temperature and DEG/FPU weight ratio promoted the FPU decomposition reaction and resulted in lower viscosity, higher hydroxyl number, and higher amine number of the recovered polyols. The hydroxyl number and amine number increased as the reaction progressed, while the viscosity decreased. Once the reaction was completed, little change was observed for the hydroxyl number and viscosity of the recovered polyols. The recovered polyol obtained at 210 °C and DEG/FPU weight ratio of 3:1 showed about the same length of time for the reaction, as well as the physical properties to that obtained at 180 °C and DEG/FPU weight ratio of 4:1.
NOx storage and reduction on Pt-supported BaTiO3 with alkali washing
Authors: Han Zengyan , Zheng Dechao , Xin Ying , Li Qian , Zhang NaNa , Zhang Zhaoliang 
Published: September 2019

Abstract
In this paper, we prepared Pt/BaTiO3-x
catalyst through modified the surface of BaTiO3 perovskite by NaOH aqueous solution and loaded Pt by incipient wetness impregnation method. A series of characterization techniques including XRD, BET and in situ IR was conducted to investigate the physical and chemical properties. We found that NO
x
storage capacity of the catalyst was significantly improved as the sample was washed in alkali for 2 h, meanwhile NO
x
conversion was optimal. The surface of the catalyst was modified by alkali washing process, and then Pt was loaded. Further calcination could enhance the interaction between Pt and Ba, which facilitate the formation of a reactive nitrite species during the adsorption process, thus increasing NO
x
storage reduction (NSR) activity.