bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effect of the Applied Temperature on the Maximum Refleactive Wavelength in Chiral Liquid Crystal Polymers
Authors: Wang Jianwen , Yang Junlin , Han Jinghui
Published: December 2019

The liqud crystals (LCs) monomers 4-(Undecenoic-1-yloxybenzoyloxy)-4’-cyanobenzene e M1 and 5-{4-[4-(4-undecyloxy) biphenyl] -oxycarbonyl} pentanoic acid cholesteryl ester M2 are synthesized. The liquid crystals polymer was synthesized by nematic and chiral LC monomers. The property of the LC materials are detected by POM and DSC. The bandgaps of the LC polymer are influenced by the change of temperature. The effect of temperature on the reflective wavelength is decreased from 513nm to 394nm with temperature increased. The chiral LC polymer is a one dimension photonic materials. The optical and thermal property of the CLCs polymer is controlled by the out field, and widely used for display, smart windows and chiral liquid crystal laser etc.
Application of Real Option Theory to Mergers and Acquisitions (M&A) in the Pharmaceutical Industry
Authors: Teng Tao
Published: December 2019

As for the mergers and acquisitions (M & A) in the pharmaceutical industry, the patent technology is one of the core values of the enterprise. However, according to the international evaluation criteria, but there are differences over the valuation strategies on the patent technology. Currently, the valuation methods used in the market are mainly cost method, market method and income method. When it comes to the uncertainty and continuity of the M & A, the real option theory can correct the valuation by late adjustment. This paper tends to interpret the real option theory through the simulation of BSM model and binary tree model, and to interpret the application of the gambling agreement to the actual operation of M & A.
Stress-strain State in Elastic Phase in Ni3Al superalloy with soft interlayer
Authors: Li Qi , Liu FengMei , Yue Xiong , Xiong Ming , Yi Yaoyong
Published: December 2019

In this study, the stress-strain State in elastic phase of cylinder-cylinder joint in Ni3Al superalloy with “soft” elastic modulus ratios was investigated by computer simulation. To establish the general patterns of SSS formation when loading cylindrical nodes with interlayers of “soft” rigidity and checking the adequacy of the simulation, three load cases were calculated: -5 (var.1), -20 (var.2) and -40 (var.3) MPa. The result shows that regardless of the magnitude of the axial load (in all load cases) in the nodes, with “soft” interlayers, the width of the zone of volumetric SSS in the main material is commensurable with the thickness of the interlayer, the length from the external surface of the node is not more than 5∼10 thickness of the interlayer; the nature of the SSS in the elastic stage of the material is completely only the level of stresses is directly proportional to the magnitude of the external load. This corresponds to the general laws of mechanics and confirms the adequacy of the results of computer simulation.
The influence of welding speed on friction stir welded of duplex stainless steel
Authors: Jia Zhongxue , Zhao Yunqiang , Dong Chunlin , Miao Shu , Wang Chungui , Yi Yaoyong
Published: December 2019

Friction stir welding of 4 mm thick 2205 duplex stainless steel was carried out. When the welding speed is low, the well-formed joint without defects can be obtained. When the welding speed is reach 70 mm/min, the hole defect occurs in the bottom of the joint. After recrystallization, fine equiaxed crystals are formed in the stirred zone. The ferrite content in the whole joint is in the range of 48 to 60%, and the ferrite content in the stirred zone decreases with the increase of welding speed. With the increase of welding speed, the hardness and tensile strength of the stirred zone increase. When the welding speed is 50 mm/min, the joint performance reaches the optimal level. The tensile strength is 824 MPa, 97.3% of the base material.
Quantitative Determination of Total Flavonoids from Polygonatum Sibiricum by Spectrophotometry
Authors: jia Guangtao , Zhao Hanqing , Hou Dianhai , Sun Tongyi , Lin Weiping
Published: December 2019

Objective: This study aims to establish a spectrophotometry method to determine the content of total flavones from Polygonatum sibiricum. Methods: Rutin was used as the control substance. After the color reaction of Al (NO3) 3-NaNO2-NaOH system, the maximum absorption wavelength was determined and the standard curve was drawn. Then the reliability of the method was verified by precision test, repeatability test, stability test and recovery test. Results: The maximum absorption wavelength of rutin is 510 nm, the standard curve is Y=10.232X-0.0047, R2=0.9991, and the linear fitting degree is high. Precision test Rsd = 1.02%, repeatability test Rsd = 2.79%, stability test Rsd = 2.25%, recovery test Rsd = 1.44%. It can meet experimental requirements.
In Vitro Antibacterial Effect and Sensitization Evaluation of Tea-Tree Oil Preparation
Authors: Li Yuejuan , Fang Ziyang , Zhu Hui , Yang Li , Liu Hailong
Published: December 2019

In order to promote the development and utilization of tea tree oil in china, The tea tree oil which was extracted from terpinen-4-ol typed Melaleuca alternifolia introduced and selected by Guangxi Forestry Science Institute, was tested in antibacterial activity, local irritation and sensitization research. The results demonstrated that the tea tree oil preparation to the selected staphylococcus aureus, epidermis staphylococcus aureus, escherich-ia coli, pseudomonas aeruginosa and candida albicans has good antibacterial activity. There were no irritating reations observed in the dermal irritation test in rabbits and 0.5% tea tree oil has no sensitization in guinea pigs. This study confirms that tea tree oil has significant antibacterial activity, low -irritating and hypo-allergenic properties, promising a broad development value.
Main Influencing Factors of Hydraulic Oil Performance for Construction Machinery
Authors: Sun Yuanyuan , Wang Pujian
Published: December 2019

The influencing factors of hydraulic oil performance are systematically analyzed, and a technical study is proposed to investigate the selection, use and service life of hydraulic oil by establishing a reasonable comprehensive performance evaluation method of hydraulic oil.
Tribological Behaviour of POM Reinforced By Graphene and PTFE
Authors: Zhang Xiaoyang , Chen Wei , Du Hongda
Published: December 2019

Graphene/polytetrafluoroethylene (PTFE)/polyoxymethylene (POM) composites were successfully prepared by high speed mixer and injection molding machine. As a consequence, graphene and PTFE covered at the surface of the POM powder evenly and the tribological performance of the composites is enhanced remarkably, especially the graphene content is 0.2%. In addition, the friction and wear behaviour of the composites is connection to the content of graphene, both of them will decrease at first and increase with the adding of graphene. In a word, this proposed method is simple and effective for mass production of graphene/PTFE/POM composites, and it is promising to be applied to fabricate many kinds of nanofillers modified POM composites.
A Pilot Study of Upcycling Methods for Fabrics of Sustainable Fashion
Authors: Chao Huang
Published: December 2019

In recent years, with the improvement of people’s environmental protection concepts, sustainable fashion has achieved better development in clothing and related industries. From spinning, weaving, dyeing and finishing to the fashion design, garment making, retail, use and disposal of the whole life cycle og clothing, effective actions can be taken to reduce energy and material consumption and reduce environmental pollution, to achieve sustainable fashion. This research focused on the upcycling methods of fabric materials. By means of inovation methods such as three-dimensional space reconstruction, fabric texture redefinition, and this study tried to establish an upcycling system for fabrics and materials, to promote the status of sustainable fashion and reduce the impact of fashion industry on the environment.
Derivation of Modified Input Estimation Filter Using Bayesian Framework
Authors: Bao Zhichao , Jiang Qiuxi , Ao Qi , Chen Qiuju
Published: December 2019

A new approach to derive the modified input estimation is proposed using Bayesian framework. Tracking manoeuvring targets is a tough problem and many algorithms are proposed to deal with it. Among these algorithms, modified input estimation (MIE) technique has been proved to be an effective method. MIE technique treats acceleration as additive input term in the state vector and estimates the original state and acceleration vectors simultaneously with a standard Kalman filter. Analogous to standard Kalman filter, however, the MIE filter equations which have a modification on Kalman gain is given without a cohesive derivation. Using a Bayesian framework, we will present a conceptually cohesive roadmap that starts at first principles and leads directly to derivation of MIE filter equations.
Performance Analysis of OFDM and FBMC
Authors: Hu Jingying , Yang Jiajia , Chuan Yingdong , Li Erlei
Published: December 2019

The purpose of this article is to compare the proposed 5G modulation techniques FBMC against OFDM which is the modulation technique used in 4G communications. In this article, we compare Spectral Density, Spectral Efficiency, PAPR, BER of FBMC and OFDM modulation techniques to analyze the merits of them. The simulation results show that FBMC has the lower BER, higher PAPR, greater Spectral Efficiency (if the burst is larger) and better performance of Spectral Density compared to OFDM modulation.
Four-Rotor UAV Safe Landing Risk Assessment Method
Authors: Lv Zhenhao , Huo Lin , Shen Mingfa
Published: December 2019

The recycling of quadrotor drones is a very important process in the execution of the mission. Traditional navigation devices such as GPS and inertial navigation are limited in many casesComplete the safety landing assessment of the four-rotor UAV. The main work is as follows: First Find relevant information to understand the development history of the four-rotor UAV and the risk of the safe landing of the four-rotor UAV and the factors affecting the landing of the four-rotor UAV, and Analyze the structure, flight principle and operation mode of the quadrotor UAV, establish the ground coordinate system and the fuselage coordinate system.Then Propose he conditions that the four-rotor UAV can land safely and the safety landing assessment method of the quadrotor UAV, and obtain the probability formula for the safe landing of the quadrotor UAV. Designing the ground environment of the landing surface of the quadrotor UAV, simulation experiments, and the probability that the four-rotor UAV will land safely in this environment.
Application and Benefit Calculation of Waste Heat Recovery of Power Plant Boiler
Authors: Wang Sen , Zhang Yingtian , Gan Zhiyong , Zhou Liansheng , Hu Qingbo , Wang Guilin , Zhou Yigang , Zhang Changzhi
Published: December 2019

In the boiler combustion of power plants, the smoke loss is the main combustion heat loss of the boiler. Reducing the exhaust gas temperature is one of the main means to reduce the heat loss of the exhaust gas, and it is also the main measure for improving the thermal efficiency of the boiler in each power plant. This paper summarizes and discusses the application and economics of installing composite phase change heat exchangers for coal-fired boilers.
Data Products Pricing Mechanism: A Harmonious and Mutual-beneficial Perspective
Authors: Xiong Li , Zheng Huixian
Published: December 2019

Data as a new production material has great potential value, and its value is reflected after the utility generated. So it is difficult to set prices for data products. This paper analyzes the characteristics of data products, builds a data product pricing model from a harmonious and mutual-beneficial perspective, and verifies the operability of the model in the simulation pricing strategy. The results of this research can help the construction and development of the data transaction market, and provide ideas for future research on data pricing.
Mathematical Modeling of Evaporator in Reheat Recovery Drum Boiler
Authors: Zhang Tianyu , Zhang Xin , Zhao Zhenning
Published: December 2019

The reheat recovery boiler is widely-used energy conservation equipment aiming to take advantage of the exit flue of gas turbine in combined cycle. Due to large amount of renewable energy getting access to grid, a more flexible and agile operation mode of reheat recovery boiler is in great need, and parameter distribution is arousing great attention of researchers. In present paper, a mathematical model of downcomer-riser-drum is established based on conversation equations. Four typical working condition of heat recovery boiler are studied, and detailed information is demonstrated.
Design of base station backup power system constructed with ladder battery
Authors: Yan Zijin
Published: December 2019

With the vigorous development of new energy technologies, the scale of the electric vehicle market continues to grow, and the number of electric vehicles has risen sharply. The problem that comes with it is that a large number of decommissioned power batteries are in urgent need of treatment. The power battery that has been retired from the whole vehicle still has objective capacity and large utilization value. Finding a suitable way to use the ladder is a commonly accepted treatment method. The communication base station backup power supply has a huge demand for energy storage batteries, which is in line with the characteristics of large-scale use of the battery by the ladder, and has become one of the main application fields of the battery. In view of the characteristics of the base station backup power system, this paper proposes a design scheme for the low-cost transformation of the decommissioned stepped power battery before use in the communication base station backup power system.
Design of Solar Mobile Power with Industry Patent Analysis
Authors: Yan Zijin
Published: December 2019

Patent data shows that mobile power supplies are in urgent need of new technology solutions. Aiming at the demand and problems of mobile power, this paper proposes a safe, reliable and high-power solar mobile power supply design. The use of a folding solar panel can provide power for portable devices such as mobile phones, and has practical value. This design can improve the charging quality of mobile electronic devices.
Research on the Influence of Thermal Performance of Steam Turbine on Energy Loss and Heat Rate
Authors: Sun Yu , Han Xuhui
Published: December 2019

A steam turbine as research object in this paper, and the thermodynamic calculation program of steam turbine and thermal system was programmed, and the influence of thermal performance change of flow passage component on the heat rate was analyzed. The results show that the efficiency of the unit is linear with the heat rate; the greater the power of the unit, the closer to the exhaust end, then the influence of unit efficiency change on heat rate is also greater. The effect of the turbine efficiency change on the heat rate was analyzed in this paper based on the heat rate change relation model; the calculation results were basically consistent with the thermal calculation, it shows that this mathematical model has high calculation accuracy and it is properly applied into engineering calculation.
Research on Faults and Maintenance Methods of Steam Turbine in Thermal Power Plant
Authors: Sun Yu , Han Xuhui
Published: December 2019

The steam turbine is one of the most critical equipment in the power generation system of thermal power plants, its daily operation condition and maintenance work will directly affect whether the power generation system can operate safely and stably. Therefore, it is necessary to strengthen the management of the steam turbine, ensure the continuous and full operation of the steam turbine unit, and ensure the power transmission of the power grid. However, some faults unavoidably appear in the steam turbine in the long-term operation, if these faults are not handled in time and effectively, the influence scope of the fault will be expanded, which causes the turbine to fail to operate normally and affect the normal work of thermal power plants. This paper analyses the common faults of steam turbine in thermal power plants, and further studies the maintenance methods for common faults of steam turbine in thermal power plants.
Polarization Image Registration Algorithm Based on Improved SIFT Descriptor
Authors: Wang Xiaodan , Yang Xu , Qin Chuanyi
Published: December 2019

With the application of polarization imaging technology more and more widely the research on how to obtain polarization information quickly and efficiently has always been the focus of people’s attention. In view of the numerous edge points generated by DoG (Difference of Gaussian) in the process of feature point extraction by SIFT(Scale-invariant Feature Transform) algorithm, which leads to tedious and time-consuming operation, an improved Sobel algorithm combined with SIFT operator image registration algorithm is proposed in this paper. The concrete implementation steps are as follows: firstly, the traditional two-direction Sobel algorithm is supplemented to eight directions, and then edge points are extracted. Then SIFT algorithm is used to detect feature points. Then, the feature points belonging to edge points are eliminated by Sobel operator. This method reduces the number of matching cycles. The processing results of RGB image and polarization image with this algorithm are compared with those of traditional SIFT algorithm, and the time consumption in the registration process is reduced by 60.5% on the premise of ensuring the accuracy.
Research on Improved Somatosensory Simulation Algorithm Based on VR Motion Simulator
Authors: Jiang Yuhao
Published: December 2019

Aiming at the problem that the classical somatosensory simulation control algorithm used in VR (Virtual Reality) motion simulator has the shortcomings of phase delay and false hint, which leads to insufficient consistency of virtual and real motion and causes VR motion sickness, an improved somatosensory simulation algorithm is proposed. The improved somatosensory simulation algorithm adds vestibular perception system on the basis of classical simulation algorithm, feeds back the output error of the algorithm, uses fuzzy control algorithm to correct and predict the input acceleration and angular velocity, and simulates the topographic fluctuation in virtual reality. The improved somatosensory simulation algorithm is modeled and simulated in MATLAB/Simulink. The simulation results show that the improved somatosensory simulation algorithm reduces the phase delay and false hints, and improves the consistency of virtual and real motion.
A Study on Time-Scaling Property of Temperature Events
Authors: Liu Zuhan
Published: December 2019

This study used detrended fluctuation analysis (DFA) and self-organized criticality method to characterize the temporal fluctuations of temperature events of Jiangxi Province. The DFA results show that the temporal scaling behaviors in temperature events. In shorter temporal scaling, it indicates the similar persistence corresponding to the annual cycle. However, in longer temporal scaling, the trends are different for the four series, which reflect the different inherent dynamic nature of various pollutant series. Furthermore, based on the self-organized criticality (SOC), the frequency-intensity distribution of temperature change satisfied Gutenberg-Richter power-law relation. Then, a numerical sandpile model with decay coefficient is constructed to reveal inherent dynamic mechanism of temperature events based on the idea of sand model. The study on occurring mechanism, temporal evolution and inherent dynamic behavior of temperature events, which could provide the scientific basis and important reference for effective establishing all kinds of emergency plan such as extreme weather disaster prevention, mitigation and relief.
Study on China’s electricity market mechanism of renewable Energy
Authors: Zhang Fan , Zhao Zheng , Tang Chenghui
Published: December 2019

This paper first introduces the current situation and background of China’s renewable energy power generation, and analyzes the difficulties of renewable energy consumption in detail. The next section mainly introduces how China’s electricity market mechanism adapted to renewable energy of high penetration. China’s electricity market mechanism is further designed based on the existing market mechanism. These market mechanisms are divided into two stages. The first stage is that the spot market has not yet been established, and the second stage is the establishment of the spot market. In both stages, the design of a market mechanism to promote renewable energy accommodation is based on the national market.
Research on Fault Diagnosis Method of Wind Turbine Bearing Based on Deep belief Network
Authors: Wang Liang , Ma Yuanyuan , Rui Xiaoming
Published: December 2019

Bearings of wind turbines have become one of the components with high failure rate in wind turbines because of their bad operating environment. In this paper, a fault diagnosis model based on deep belief network is proposed for bearing fault diagnosis of wind turbine. The time-frequency spectrum of wind turbine bearing vibration data after short-time Fourier transform (STFT) is used as the input of fault diagnosis model, and the output is the identification code of various fault types of wind turbine bearing. Compared with the deep belief network diagnosis model based on the time domain signal input to the vibration data of wind turbine bearings, the deep belief network fault diagnosis model based on the short-time Fourier transform of the input signal has higher recognition accuracy. Based on the vibration data of different working conditions and rotating speeds, the model can automatically find fault features and identify the faults of rolling elements, inner rings and outer rings of rolling bearings at different locations, thus avoiding expert experience and feature engineering, making the model more versatile and generalizable and potential for efficient on-site rolling bearing fault diagnosis.
Research on Operation Risk Prevention and Control Method of Multi-energy Complementary New Energy Power Generation System under Market Mechanism
Authors: Lan Mengxin , Zeng Ming , Cao Yuwei , Tian Shi , Wei Peng , Song Rui
Published: December 2019

The development of multi-energy complementary new energy generation system is of great practical significance in today’s era when the demand for electricity is increasing and environmental protection is imminent. However, due to the limitation of external environment, internal technology and materials, the development of new energy system with multi-energy complementary energy is faced with many risks, which have a certain impact on its development. Risks cannot be avoided and will exist for a long time. Therefore, it is of great significance for the development of this system to correctly identify risks and evaluate them, and to propose corresponding countermeasures and focus according to the assessment results. This paper first analyzes and identifies qualitatively the risks faced by the new energy system under the market mechanism from the aspects of policy risk, transaction risk, market risk and operation risk. Then, the risk index database was established, and the risk of various aspects were presented side by side, and the main influencing factors of the risk were listed correspondingly. Next, risk assessment model is established through analytic hierarchy process and fuzzy comprehensive evaluation method, aiming to evaluate the above risks qualitatively. At the same time, a concrete example is introduced to apply and test the above model, and a constructive conclusion is obtained for the example, and the feasibility of the risk assessment model established in this paper is verified, which can be applied to risk assessment of other similar projects.
The Influence Mechanism of Class Identification and Environmental Values on Garbage Classification Behavior
Authors: Yang Hongxiong , Chen Junshu
Published: December 2019

Empirical Analysis Based on the Data of the 2015 Urban Residents Living Conditions Survey; The mediating effect model of perceived behavioral control and perceived behavioral dynamics is tested to explore the internal mechanism of public garbage classification behavior. Through the analysis of mediating effect model, we find that the class identity has direct effect on garbage classification behavior, and the mediating effect is reflected by perceived behavior control and perceived behavior dynamics. Environmental values have direct effects on garbage classification behavior and have significant mediating effects through environmental behavior control. Therefore, promoting the public green consumption idea, fostering the environment-saving habits, can enhance environmental responsibility awareness, promote the public garbage classification behavior.
The Final Energy Consumption Characteristics of the G7 and BRICS Nations
Authors: Yu Hao , Cheng Qiangsheng , Chen Ruixin
Published: December 2019

Group of Seven (G7) and BRICS have an important position in many spheres, the research on these countries’ final energy consumption is necessary and important. It will provide China with the experience on “low-carbon development” and “energy saving”. The research indicates that in the final energy consumption structure of the G7, oil and natural gas occupy the higher proportion. As for the BRICS countries, the proportion of coal, renewables & and waste is much higher. G7 countries’ transport sector, business and the public sector are higher than the proportion of BRICS countries, while the proportion of BRICS countries is higher than the Group of Seven industrial sector.
Effect of Flue Gas Recirculation on Operating Performance of Coal-Fired Unit Boiler
Authors: Zhang Limeng , Dong Xinguang , Cui Fuxing , Wang Haichao , Liu Jinglong , Hu Zhihong
Published: December 2019

Taking the flue gas recirculation system of 220MW coal-fired unit as the test object, effects of the operation mode of the flue gas recirculation system on the operating characteristics of the boiler under different working conditions was studied. The results show: To a certain extent, the operation of flue gas recirculation system will reduce boiler efficiency, which is more obvious under low load conditions. However, The operation of the flue gas recirculation system can effectively increase temperatures of reheat steam and superheated steam.Comparing the economics of the front and rear units of the flue gas recycling system, it can be find that net coal consumption of the unit under the load of 200MW and 140MW can be reduced by up to 1.51g/kW·h and 1.86g/kW·h respectively.
Research Based on IEEE1588 Frequency Compensation Algorithm
Authors: Liu Xiao , Li Changjun
Published: December 2019

The paper first studies the IEEE1588 network clock synchronization system. Aiming at the instability of the system clock crystal oscillator, a frequency compensation algorithm is proposed, which can adjust the master-slave clock frequency and ensure the master-slave clock synchronization. The simulation analysis shows that when the master-slave clock generates the deviation value, the master-slave clock is consistent with the execution of the frequency compensation algorithm, which verifies the feasibility and effectiveness of the algorithm.
Formation Causes and Preventive Measures of the Scale of 600MW Unit High Temperature Reheater Tubes
Authors: Li Zhenliang , Ke Hao , Wang Xi
Published: December 2019

It was found obvious accumulation of scale at the elbow of a high temperature reheaters, by measuring scale accumulation of boiler high temperature reheater SA213-TP347H steel pipe of a power plant. By hardness test, tensile test, optical microscopy and spectroscopy analysis of the pipe sample, it was showed that hardness test results meet DL / T 438-2009 standard requirements; mechanical properties test results meet GB 5310-2008 standards. The microstructure of cross-sectional sample is austenite. EDS analysis result shows that the scale mainly composed of Fe, Cr, Ni oxide. There is obvious stratification in the scale of austenitic stainless steel, the inner layer scale has higher levels of Cr and Ni, Fe and O content is relatively low, which has antioxidant. Fe and O content of the outer layer of skin is relatively high, low Cr and Ni content, leading to its outer oxide does not have the ability of anti-oxidation. There are gathered holes between the inner and outer layers. Temperature change process will produce stress, resulting in oxidation of the outer layer of skin off. Finally, a few precautions to prevent the scale spalling are proposed.
MAYA-aided sculpture design and ANSYS Finite Element Structural Analysis——A Case Study of a Public Sculpture in JiangBei New District of Nanjing
Authors: Cao Yang
Published: December 2019

With the acceleration of urbanization in China, public sculptures have become landmarks of many communities or architectural complexes, and promoted cultural environments. Computer-aided public sculpture design combined with structural analysis has become a new creation mode. This study investigates computer three-dimensional aid design combined with computer-aided engineering based on the creation practice of a sculpture in Jiangbei (north of the Yangtze River) New District of Nanjing to improve design efficiency and design quality. The results have certain reference significance for the current digital public sculpture design.
Study on the Ways of Training and Practice of New Type of Professional Farmers in the Perspective of Low Carbon Economy
Authors: Sun Xu , Lv Xing , Liu Baihan
Published: December 2019

Under the background of “prospering farmers” and “village revitalization”, modern agricultural development has raised the economic development agenda. At present, the low-carbon green economy is the general direction of economic development, reducing agricultural pollution, developing green agriculture, and focusing on the development of agricultural low-carbon economy is the current strategic direction of agricultural development. Cultivating new professional farmers is the key to China’s agricultural transformation and the only way to develop modern agriculture. The new type of professional peasant refers to high-quality peasants who use agriculture as their main source of economic resources, advanced knowledge, agricultural production management skills, good cooperation, innovation, high social responsibility and market understanding. Compared with traditional peasants, the new professional peasants have the characteristics of new ideas, high quality and professionalism. Rural vocational education must adhere to the goal of serving the “three rural”, strengthen the construction of the teaching staff, increase funding and change the teaching methods, in order to better serve the new professional farmers.
Method for Calculating Static Temperature of Turbofan Engine Compressor Outlet Airflow
Authors: Qian Renjun , Li Benwei , Zhou Pengyu , Teng Huailiang , Wang Yonghua
Published: December 2019

In order to solve the problem that the temperature of the compressor outlet air in turbofan engine is not measurable, a method of calculating the static temperature of the compressor outlet air based on the total temperature of the compressor outlet air in the engine bench test data is proposed, according to the principle of aerothermodynamics. And a Simulink model is established. The total temperature, total pressure and design point flow at the compressor outlet of the engine are brought into the Simulink model to calculate. The results show that the static temperature of the compressor outlet at the design point is Ts
= 0.9873T*. According to the inverse relationship between temperature ratio function and N2 speed, the linear interpolation is carried out. The relationship between static temperature of compressor outlet and total temperature is T = (1 − 0.0127* N
2)T*.
Application of Variable Frequency Speed Regulation Technology in Fan System
Authors: Chen Tao , Liao Xudong , Chen Silin , Li Zengyan
Published: December 2019

With regard to the problem in fan air volume control, the research on air volume method was carried out, and the air volume control method for frequency conversion speed regulation was adopted. In this regard, a motor variable frequency speed regulation system was designed, and a variable frequency control software was developed. In order to verify the control effect of the system on the fan air volume, a measurement experiment on the fan speed was carried out, and it was concluded that the variable frequency speed regulation method was highly precised, and had a sound linearity. While finally, this variable frequency speed regulation system was applied in the fan system, and the equal thickness collection experiment on the material was carried out in order to ensure the strict control over the air volume, which has obtained a relatively sound application effect.
Application Analysis of Power Budget in Energy Companies Based on ERP Environment
Authors: Wang Dongfa
Published: December 2019

There are many shortcomings in budget management under the ERP environment of power energy companies. Due to the large number of branches, the power energy company has experienced insufficient connection with some branches. Power energy companies must do a good job in the construction and application of the budget management system under the ERP environment, and need to optimize the existing problems. Therefore, the comprehensive budget of the power energy company is a subject to be further studied. It plays an important role in deepening the reform of the power energy company, accelerating its health transformation, reducing operating costs, optimizing resource allocation, and achieving strategic goals.
Effects of Initial Crack Defect on Fatigue Crack Growth of Camshaft for Nuclear Emergency Diesel Engine
Authors: Zhao Minghuang , Duan Chenghong , Han Xiangxiang , Luo Xiangpeng
Published: December 2019

In this paper, the finite element analysis model of camshaft for nuclear emergency diesel engine with initial crack defect is established based on ABAQUS finite element analysis software. The effects of initial crack defect parameters on crack tip stress intensity factor are studied by a working condition discretization method. The numerical results show that the crack tip stress intensity factors of transverse crack and longitudinal crack are quite different in a load cycle of camshaft. The crack tip stress intensity factors of transverse crack fluctuate greatly, and the crack tip stress intensity factor range is much larger than that of longitudinal crack, which indicates that the fatigue fracture risk of transverse crack on the camshaft journal is higher. With the increase of initial crack depth from 1 mm to 4 mm, the crack tip stress intensity factor range increases from 410.84 MPa·mm1/2 to 720.24 MPa·mm1/2 by 75.3%, which indicates that the increase of initial crack depth can lead to a significant increase of the fatigue fracture risk. As the initial crack defect moves away from the cam, the maximum of the crack tip stress intensity factor initially increases and then decreases after reaching a maximum value. When the initial crack is 3 mm away from the end face of the cam, the crack tip stress intensity factor range is the largest (843.98 MPa·mm1/2), which indicates that the fatigue fracture risk of transverse crack at this position is the highest. The research results obtained in this paper may provide some reference for the fracture assessment and reliability analysis of camshaft for nuclear emergency diesel engine.
Optimization of Air-Coal Distribution System for 1000MW Thermal Power Unit Based on Data Mining
Authors: Liu Yixian
Published: December 2019

At present, the operation adjustment of the power distribution system of the power station boiler mainly relies on the experience of the operators and the optimization and adjustment test, neither of them can be economically and flexibly adapted to the current situation of complex boiler combustion conditions and strict environmental protection indicators. To reduce the NOx generated by pulverized coal combustion in the furnace, this paper effectively combines the big data mining technology with the boiler combustion system based on the best ratio of coal-air. Taking the double-cut circular boiler designed by a 1000MW thermal power unit as an example, we use Apriori algorithm to mine the association rules in historical operation data and develop software to guide the operation of the operator. By calculating, the NOx content of the SCR inlet after adopting the optimization scheme is reduced by about 17%. Combined with the “cost-benefit analysis of denitration technology” spectrum, the denitration cost is reduced by about 200, 000 yuan per month.
Study on Stability and Durability of Coal Gangue Used in Runway Base
Authors: An Yong
Published: December 2019

Coal gangue, as industrial waste generated in the mining process, is rarely used in the construction of domestic airport runways. This paper studies the stability of coal gangue and the durability of cement stabilized coal gangue in combination with the characteristics of navigation airport construction. The coal gangue self-stability test includes: chemical composition, loss on ignition, crushing value and expansion ratio. The durability of cement stabilized coal gangue is mainly based on the freeze-thaw cycle test. The test results show that the sum of the content of coal gangue SiO2, Al2O3 and Fe2O3 in the mine is more than 70%, the loss on ignition is less than 15%, the control standard can be achieved, and the expansion ratio is not more than 0.5%. Coal gangue itself has good stability. By comparing the compressive strength values of the standard test pieces before and after 6 freeze-thaw cycles, it is found that the cement-stabilized coal gangue with different cement content has a frost resistance of more than 60%, and the overall frost resistance is good. In addition, considering the load level and safety reserve of the navigable airport, the cement content should be greater than 5%. The above conclusions can provide reference for the application of coal gangue in the field of airport construction.
Study on the Influence of Tube Curvature on Heat Transfer Characteristics of High Efficiency Air Pre-cooler
Authors: Cao Zhiqiang , Ai Chunan , Wang Xueren , Li Jian
Published: December 2019

High-efficiency pre-cooler is one of the key components of RBCC combined engine. To explore the influence of tube row curvature on heat transfer, a convection heat transfer simulation of pre-cooler composed of different curvature tube rows is established. The model and numerical calculations show that when the curvature is small, the heat transfer efficiency increase slowly with curvature increasing, but the flow resistance increase obviously by increasing curvature. However, when the curvature is large, the effect of curvature increasing on the heat transfer efficiency is obvious and the increase of flow resistance get slower. Based on this, a ring pre-cooler is designed and the heat transfer effect is simulated. It has reference application value for the design of high efficiency pre-cooler.
Research on Frame Size of Vehicle Mounted Hydrogen Supply System Based on Parametric Design
Authors: Huang Jinhao , Duan Chenghong , Zhao Minghuang , Luo Xiangpeng
Published: December 2019

The hydrogen supply system is the energy supply of hydrogen-powered vehicle. The failure of most parts in the hydrogen supply system is due to the impact and vibration caused by complex road conditions. Therefore, it is required that the hydrogen supply system should have good impact and vibration resistance. In this paper, the Design Exploration module in ANSYS Workbench is used to study the multi-objective optimization about the stiffness and strength of a two-bottle horizontal hydrogen supply system under impact and vibration conditions. The responding surface between the width and length of the frame and the stiffness and strength of the system under different conditions is developed. The optimal frame size which can effectively reduce the stress state of the system structure under impact and vibration condition is obtained.
Numerical investigation of Transient Temperature Field on the Selective Laser Melting process with Al6063
Authors: Chen Xinyue , Duan Xianyin , Jiang Guozhang
Published: December 2019

The finite element simulation of the selective laser melting process with Al6063 metal powder was carried out by using ABAQUS. The loading of the laser Gaussian moving heat source is realized, and a model of the three-dimensional transient temperature field is established. The effects of scanning speed and scanning pitch on temperature distribution and temperature changes on different scanning channels were investigated. The simulation results show that due to the heat accumulation effect and heat conduction, the previous scan will have effect on the surrounding powder, which results the rise of temperature. Different scanning speed and the scanning pitch have influence on the temperature distribution. As the scanning speed increases, the temperature gradually decreases, and the increase in the scanning pitch also lead to lower temperature of the powder layer.
SOC Estimation of Lithium Battery Based on Dual Adaptive Extended Kalman Filter
Authors: Zheng Yongliang , He Feng , Wang Wenliang
Published: December 2019

The estimation accuracy of single extended Kalman filter is not high, also it is affected by the initial value of state of charge (SOC). The second-order RC equivalent circuit model of lithium battery is established, and a joint algorithm, dual extended Kalman filter (DEKF) is proposed. Besides, the covariance matching theory is introduced for DEKF under the complex condition of uncertain noise statistical characteristics to improve the estimation accuracy. The improved DEKF is compared with another joint algorithms, i.e. recursive least squares and extended Kalman filter (RLS-EKF). Through the validation of battery test data, the modified dual extended Kalman filter based on covariance adaptive algorithm can realize real-time online estimation of battery SOC and time-varying parameters, and the estimation accuracy of lithium battery SOC and battery time-varying parameters is higher.
Research on Motion Prediction Algorithm Based on Nash Equilibrium
Authors: Wang He , Zhang Tianchi , Zhang Jing , Zhang Xiaodong , Chen Jiasen
Published: December 2019

The Nash equilibrium method is studied in this paper, and a new motion prediction algorithm based on Nash equilibrium is proposed. This method includes 3 main contents: 1. Analyze and abstract the influencing factors of object motion. 2. Analyze the effects of each factor and list the Nash equilibrium equation. 3. Find the optimal solution of the system of equations. Use Nash equilibrium method to attain the purpose of overall considerate all influencing factors of motion prediction. This algorithm can solve the problem that the current motion prediction algorithm can’t take all the influence factors into account. To verify this method, we introduce this method to the ocean drift motion prediction and prove the accuracy of the method through three sets of comparison experiments.
Research on Brake Energy Recovery System Based on Uncertain Stacked Auto Encoder Method
Authors: Zhang Shudong , Peng Sijie , Xing Zhichao , Sun Deneng
Published: December 2019

Aiming at the problem of real-time and poor reliability caused by the complex control algorithm of braking energy recovery system of electric vehicle, the uncertainty optimization theory is introduced into the SAE sample data preprocessing stage to establish the uncertainty SAE control parameter prediction model. The simulation results show that the real-time and reliability of the proposed method meet the system requirements, and the prediction accuracy of the control parameters is high.
Shadow Image Characteristics and Feature Extraction Method of Large Caliber Projectile in Outfield
Authors: Li Jianrong , Gao Hongju , Sun Zhonghui , Wei Yong , Liao Shijun , Qiao Zhiwang , Di Changan
Published: December 2019

According to the shape characteristics of large-caliber projectiles in shadow photography and the characteristics of external field environment, this paper focuses on the characteristics of external field shadow imaging and proposes a method for extracting the features of outfield shadow image of large-caliber projectiles. Based on the image preprocessing, the Bullet Tip feature points are determined by the intersection of the central axis and the edge, while the bullet tail feature extraction method based on ellipse fitting. The fitting accuracy of ellipse fitting method and upper and lower endpoint method are simulated and compared. The results show that the ellipse fitting method determining the center of the target end surface is better, with the extraction accuracy of 0.44 piexl.
Research on Optimum Algorithm of Charging Pile Location for New Energy Electric Vehicle
Authors: Guo Shufen , Zhu Lizong , Jiang Suping , Li Biqing
Published: December 2019

Artificial intelligence algorithms such as ant colony algorithm and neural network do not need to rely on a large amount of gradient information when solving, especially for large-scale complex optimization problems which are difficult to solve by traditional methods, which provides a new perspective and thinking direction for solving such problems. Based on the analysis of the principles and advantages and disadvantages of RBF neural network and ant colony algorithm, this paper proposes a RBF neural network based on genetic mutation improved ant colony clustering algorithm to evaluate the location of charging station. The improved ant colony clustering algorithm based on genetic variation is used to determine the number of hidden layers of RBF neural network, so as to solve the problem that the initial parameters of RBF neural network can not be accurately selected without scientific methods. An example is used to prove the scientific and effectiveness of this method. Finally, the optimal scheme of charging station location is determined by comparing the comprehensive ranking values obtained by various methods used in this paper to judge the advantages and disadvantages of charging station location.
Research on Heating Operation Mode of Near Zero Energy Consumption Building in Severe Cold Areas
Authors: Cui Zhengxu
Published: December 2019

Near zero energy building is a development direction of building energy saving, but it is difficult to meet the indoor heating demand simply by depending on passive design, according to the traditional mode, continuous heating will cause a lot of energy waste. In order to study the best operation mode of near zero energy consumption building heating in severe cold areas, this paper monitors a near zero-energy building in the northeast as a research object. This near zero energy consumption building adopts the concept of green building and passive design in the design, uses various building energy-saving technologies, compares and analyzes the energy consumption of conventional buildings, and finds that the heating load of near zero energy consumption buildings is lower than that of conventional buildings, which has great potential for energy saving.
Research on the High-Quality Development Path of New Energy Vehicle Industry in China
Authors: Liang Yongkang , Zhang Weifeng
Published: December 2019

This paper analyzes the current development status of the new energy vehicle industry in China, and then summarizes the problems from the aspects of core technology, quality, marketing, and supporting facilities. On this basis, It also proposes four paths for the high-quality development, including key technology innovation, industrial policy reform, supporting facilities construction, and long-term development planning. The conclusion provides a theoretical reference for the high-quality development of the new energy vehicle industry in China.