bluuebunny/crossref_metadata_2025 huggingface dataset:
Hard topological versus soft geometrical magnetic particle transport
Authors: Rossi Anna M. E. B. , Bugase Jonas , Lachner Thomas , Ernst Adrian , de las Heras Daniel , Fischer Thomas M.
Published: October 2019

Geometrical displacement of transported ferrofluid droplets (red) versus topological displacement of transported doublets and single spheres.
Designing a new aluminium muconate metal–organic framework (MIL-53-muc) as a methanol adsorbent for sub-zero temperature heat transformation applications
Authors: Matemb Ma Ntep Tobie J. , Reinsch Helge , Hügenell Philipp P. C. , Ernst Sebastian-Johannes , Hastürk Emrah , Janiak Christoph
Published: October 2019

Methanol as an adsorbate can enable adsorption-driven heat pumps and chillers to operate at temperatures below 0 °C with an appropriate pairing adsorbent.
Mixed-matrix membranes for CO2 separation: role of the third component
Authors: Guo Xiangyu , Qiao Zhihua , Liu Dahuan , Zhong Chongli
Published: October 2019

Mixed-matrix membranes (MMMs) have exhibited excellent performances for CO2 separation, but it is still an ongoing challenge to enhance the separation performance through optimization of their structures.
Tunable nanofibril heterojunctions for controlling interfacial charge transfer in chemiresistive gas sensors
Authors: Chen Shuai , Gao Nan , Bunes Benjamin R. , Zang Ling
Published: October 2019

A comprehensive overview of the current state of the art of chemiresistive sensors based on tunable nanofibril heterojunctions for controlling interfacial charge transfer.
Enhancing phase separation with a conformation-locked nonfullerene acceptor for over 14.4% efficiency solar cells
Authors: Zhang Zhuohan , Liu Xin , Yu Jiangsheng , Wang Hongtao , Zhang Ming , Yang Linqiang , Geng Renyong , Cao Jinru , Du Fuqiang , Liu Feng , Tang Weihua
Published: October 2019

The molecular backbone design and sidechain control are both considered for fused-ring electron acceptors to fine-tune the morphology and miscibility of the active layers for organic solar cells.
Ground-based optical transmission spectrum of the hot Jupiter HAT-P-1b
Authors: Todorov Kamen O. , Désert Jean-Michel , Huitson Catherine M. , Bean Jacob L. , Panwar Vatsal , de Matos Filipe , Stevenson Kevin B. , Fortney Jonathan J. , Bergmann Marcel
Published: October 2019

Context. Time-series spectrophotometric studies of exoplanets during transit using ground-based facilities are a promising approach to characterize their atmospheric compositions.

Aims. We aim to investigate the transit spectrum of the hot Jupiter HAT-P-1b. We compare our results to those obtained at similar wavelengths by previous space-based observations.

Methods. We observed two transits of HAT-P-1b with the Gemini Multi-Object Spectrograph (GMOS) instrument on the Gemini North telescope using two instrument modes covering the 320–800 and 520–950 nm wavelength ranges. We used time-series spectrophotometry to construct transit light curves in individual wavelength bins and measure the transit depths in each bin. We accounted for systematic effects. We addressed potential photometric variability due to magnetic spots in the planet’s host star with long-term photometric monitoring.

Results. We find that the resulting transit spectrum is consistent with previous Hubble Space Telescope (HST) observations. We compare our observations to transit spectroscopy models that marginally favor a clear atmosphere. However, the observations are also consistent with a flat spectrum, indicating high-altitude clouds. We do not detect the Na resonance absorption line (589 nm), and our observations do not have sufficient precision to study the resonance line of K at 770 nm.

Conclusions. We show that even a single Gemini/GMOS transit can provide constraining power on the properties of the atmosphere of HAT-P-1b to a level comparable to that of HST transit studies in the optical when the observing conditions and target and reference star combination are suitable. Our 520–950 nm observations reach a precision comparable to that of HST transit spectra in a similar wavelength range of the same hot Jupiter, HAT-P-1b. However, our GMOS transit between 320–800 nm suffers from strong systematic effects and yields larger uncertainties.
A comprehensive study of NGC 2345, a young open cluster with a low metallicity
Authors: Alonso-Santiago J. , Negueruela I. , Marco A. , Tabernero H. M. , González-Fernández C. , Castro N.
Published: October 2019

Context.NGC 2345 is a young open cluster that hosts seven blue and red supergiants, low metallicity, and a high fraction of Be stars, which makes it a privileged laboratory to study stellar evolution.

Aims.We aim to improve the determination of the cluster parameters and study the Be phenomenon. Our objective is also to characterise the seven evolved stars found in NGC 2345 by deriving their atmospheric parameters and chemical abundances.

Methods.We performed a complete analysis combining for the first timeubvyphotometry with spectroscopy as well as theGaiaData Release 2. We obtained spectra with classification purposes for 76 stars and high-resolution spectroscopy for an in-depth analysis of the blue and red evolved stars.

Results.We identify a new red supergiant and 145 B-type likely members within a radius of 18.7 ± 1.2 arcmin, which implies an initial mass,Mcl ≈ 5200 M⊙. We find a distance of 2.5 ± 0.2 kpc for NGC 2345, placing it atRGC = 10.2 ± 0.2 kpc. Isochrone fitting supports an age of 56 ± 13 Ma, implying masses around 6.5M⊙for the supergiants. A high fraction of Be stars (≈10%) is found. From the spectral analysis we estimate an averagevrad = +58.6 ± 0.5 km s−1and a low metallicity, [Fe/H] = −0.28 ± 0.07, for the cluster. We also determine chemical abundances for Li, O, Na, Mg, Si, Ca, Ti, Ni, Rb, Y, and Ba for the evolved stars. The chemical composition of the cluster is consistent with that of the Galactic thin disc. One of the K supergiants, S50, is a Li-rich star, presenting anA(Li) ≈ 2.1. An overabundance of Ba is found, supporting the enhanceds-process.

Conclusions.NGC 2345 has a low metallicity for its Galactocentric distance, which is comparable to typical Large Magellanic Cloud stars. It is massive enough to serve as a test bed for theoretical evolutionary models for massive intermediate-mass stars.
Hemispheric injection of magnetic helicity by surface flux transport
Authors: Hawkes G. , Yeates A. R.
Published: October 2019

Aims. We estimate the injection of relative magnetic helicity into the solar atmosphere by surface flux transport over 27 solar cycles (1700–2009).

Methods. We determine the radial magnetic field evolution using two separate surface flux transport models: one driven by magnetogram inputs and another by statistical active region insertion guided by the sunspot number record. The injection of relative magnetic helicity is then computed from this radial magnetic field together with the known electric field in the flux transport models.

Results. Neglecting flux emergence, solar rotation is the dominant contributor to the helicity injection. At high latitudes, the injection is always negative/positive in the northern/southern hemisphere, while at low latitudes the injection tends to have the opposite sign when integrated over the full solar cycle. The overall helicity injection in a given solar cycle depends on the balance between these two contributions. This net injected helicity correlates well with the end-of-cycle axial dipole moment.
Research on Key Technologies and Applications of Energy Internet Blockchain
Authors: Zhu Xingxiong
Published: October 2019

In view of the challenges facing the current development of energy Internet, the basic theory, architecture implementation and application mode of energy blockchain technology are proposed from the communication layer, data layer and contract layer. In this paper, we analyze the value distribution mode of blockchain in energy internet, integrate business form, information system, Internet of Things and blockchain, and build secure and autonomous peer-to-peer energy Internet environment based on blockchain. The key technologies are constructed from the network layer, system layer and business layer. The problems of network layer equipment and data access authentication, secure and trusted sharing are solved. The system layer blockchain-based power payment, power settlement, power audit and other business support capabilities are improved. The system enhances the security and credibility of business, and drives the future global energy Internet development.
Synthesis and characterization of La1-xCexNiO3 with enhanced visible light photocatalytic activities
Authors: Li Ying-ying , Li Jin-zhou , Liu Yong-chun
Published: October 2019

A series of La1-xCexNiO3 photocatalysts with different content of cerium element have been synthesized by sol-gel method. The as-prepared products were characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic activities of these La1-xCexNiO3 composites under visible-light irradiation were evaluated by the degradation of methyl orange (MO). The effect of important operational parameters such as catalyst amount, reaction temperature, irradiation time, and comparison of photocatalytic activity with different dyes including methyl orange, alizarin red, alizarin yellow, xylenol orange were also studied. The results revealed that the La0.8Ce0.2NiO3 (LCNO) composites exhibited much higher photocatalytic activities than pure LaNiO3 (LNO).
Middle Jurassic sequence stratigraphic characteristics in Longdong coalfield
Authors: Xu Tai , Li Shuang , Yang Fengfeng , Zhang Jufeng , Zhu Xiulan
Published: October 2019

Stratigraphic sequence contrast and sequence stratigraphic framework are of great significance for the sedimentary phase and sedimentary systems of coal-accumulating basin. In the coal-bearing basin, the variation of the flooding surface controls the migration law of the coal-concentrating centres within the range. Therefore, the sequence comparison work is crucial to find favorable coal-collecting areas. In addition, studying the position of the coal seam in the sequence stratigraphic framework and carrying out the sequence comparison work in the lateral direction can effectively track the change of the position of the coal seam in the sequence stratum and summarize the law of coal seam accumulation and occurrence, which can be better to plan and guide the exploration and development of coal resources in Longdong coalfield.
Influence of the composition of the oak bark extract and chlortetracycline on hematological blood parameters of broiler chickens
Authors: Kvan Olga , Duskaev Galimzhan , Sheida Elena , Rakhmatullin Shamil , Kosyan Dianna
Published: October 2019

Poultry farming is one of the most profitable and highly productive branches of agriculture. However, despite the achievements, there are many unresolved problems remaining in industrial poultry breeding. In particular, violating technological rules of feeding and housing and an amiss environmental state lead to deterioration of the immune system and development of a number of pathologies, which heavily reduces the productivity of this area of agriculture. Based on the above, much attention is focused on the search for drugs that would optimize the metabolism in the bird’s organism, struggle with infectious agents, and increase the productivity of an organism. The study allows to comprehensively examine the properties of plants containing phytobiotic components and the use of modern technologies for producing and standardizing these components, when their experimental and manufacturing approbation lets widely apply plant extracts to animal feeding as dietary supplements of the latest generation based on raw materials of natural origin.
Optimization of process parameters and kinetics of adsorption treatment of thallium-containing wastewater
Authors: Wen Tao , Zhao Yuanyuan , Xu Youze , Guo Jing , Fu Guangyi , Cheng Yingxiang , Zhong Yu
Published: October 2019

Thallium is an extremely toxic metal and abundant in industrial wastewater but little studied. In order to understand the optimal adsorption kinetic parameters of the chelating resin containing hydrazine wastewater, we carried out adsorption experiments on the cerium-containing wastewater treated by chemical precipitation. In this chapter, the optimum adsorption conditions, adsorption model, dynamic adsorption curve and desorption and regeneration of adsorbent were determined at different pH, temperature, adsorption time and different adsorbent dosage. The results show that the removal rate of thallium wastewater by resin is up to 97.5% when the pH value is 9. The optimum adsorption temperature is 30 and the adsorption reached equilibrium at 80 min. The adsorption process is consistent with Lagergren quasi-second-order adsorption and Langmuir isotherm model. The regenerative properties of the resin show that the resin adsorption rates still reach 95.8% after repeat use for six times. In summary, the chelating resin has good adsorption and reusability to the thallium-containing wastewater
Construction and case study of total factor evaluation index system of power generation enterprises
Authors: Li Yi
Published: October 2019

The electric power enterprises cannot cope with the current electric power system reform trend If they do not have enough competition abilities. Therefore, how to construct competitiveness evaluation system for power enterprises according to the characteristics of power market plays an important role in improving the scientific management level of electric power enterprises. This paper designs the evaluation system of total factor competitiveness of power generation enterprises, including market force, marketing force, development force, reliability, economy, flexibility, environmental protection. Analytic hierarchy process and fuzzy comprehensive evaluation method are used to determine the weight and the final evaluation basis.
Promotion of Biogasification Efficiency by Pretreatment and Bioaugmentation of Corn Straw with Microbial Consortium
Authors: Zhu Qili , Wang Yanwei , Tan Furong , Wu Bo , Dai Lichun , He Mingxiong , Hu Guoquan
Published: October 2019

To better understand the comparative effects between pretreatment and bioaugmentation methods on the promotion of corn straw biogasification efficiency, we analysed the cellulase activity, cellulose degradation rate, surface structure characteristics, and biogas production of corn straw that had been pretreated with aerobic microbial consortium (AMC). In addition, we also studied the effect of bioaugmentation using anaerobic microbial consortium (ANMC) on corn straw biogasification efficiency. The results from our study demonstrated that the cumulative methane generated from AMC and ANMC were 233.09 mL·g-1 VS and 242.56 mL·g-1 VS, which was increased compared to the control by 6.89% and 11.23%, respectively. We also observed that ANMC could also function to dramatically promote methane content during the anaerobic digestion of corn straw. This study demonstrated that AMC and ANMC were both able to promote the biogasification efficiency of corn straw, however, ANMC was found to perform better compared to AMC.
Research Progress on Control and Removal Technology of SO3 of Coal-fired Power Plants
Authors: Liu Xiuru , Sun Yiqing , Xue Fangming , Su Jingcheng , Qu jiangjiang , Chen Feng
Published: October 2019

SO3 is one of pollutants in flue gas of coal power plants. It mainly derived from coal combustion in boiler and selective catalytic reduction denitrification system. The content of SO3 in flue gas were influenced by the combustion mode, sulfur content in fuel, composition of denitrification catalyst and fly ash. SO3 and water vapour generated H2SO4 droplets. Sulfate secondary particles in atmosphere could cause haze, acid rain and other disastrous weather. High concentration of SO3 could cause blockage and corrosion and affect the safe operation of the units. The generation mechanism of SO3 was discussed. The latest research progress on control and removal technology of SO3 was summarized. The study in this paper provides a reference for pollutant treatment in coal-fired power plants.
Recent advances in BiOIO3 based photocatalytic nanomaterials
Authors: Jia Tao , Xiao Yixuan , Ji Zhonghao , Wang Run , Wu Jiang
Published: October 2019

Semiconductor photocatalysis technology using solar energy has broad application prospects in energy conversion and environmental purification, while the photocatalytic efficiency is unsatisfactory due to limited photoresponse and recombination of charge carriers. Many researchers have made great efforts to develop new and efficient photocatalysts to solve the above problems. Among photocatalysts, bismuth-based nanomaterials have become ideal photocatalysts because of its unique layered structure, narrow band gap, better visible light response and good electron-hole separation characteristics. Particularly, appropriately modified photocatalysts shows better photocatalytic performance due to enhanced photoresponse characteristics and promoted separation and migration of electron-hole pairs. In this review, the characteristics of bismuth oxyiodate in bismuth-based photocatalysts are systematically introduced. Recent efforts for various modification strategies of bismuth oxyiodate have also been demonstrated and evaluated. Finally, this paper also briefly summarizes and forecasts the challenges and development directions of bismuth-based photocatalysts.
Study and Application of Stability of Natural Organic Polymer Coagulants
Authors: Meng Xiangjun , Fu Ying
Published: October 2019

The natural organic polymer coagulants have attracted much attention due to their safety, non-toxicity, good biodegradability and abundant sources of raw materials. However, the instability of coagulants has restricted their further development and application. In this paper, the main types of coagulants, the research of unstable performances and improvement measures are reviewed. Meanwhile, the applications in water treatment are introduced. Finally, the development prospects of coagulants are prospected in order to provide new ideas for the further study of natural organic polymer coagulants.
Fault tree analysis of large-scale blackout accidents
Authors: Fu Dong , Gao Song , Yan Zhenhong , Wu Hongye , Xu Xiaohu , Xu Kaili
Published: October 2019

Fault tree analysis method is used to analyze the large-scale blackout accidents. Minimum cut sets and minimum path sets of large-scale blackout accidents are calculated, and the structural importance degree of the accidents is analyzed according to the minimum path sets. Direct factors that cause large-scale blackout accidents are determined. Effective measures are put forward to prevent large-scale blackouts, and the theoretical basis is put forward to prevent large-scale blackouts.
Research on performance evaluation method of effective assets of power grid based on value engineering
Authors: Wang Mianbin , Niu Xiaoxuan , An Lei , Li Jinchao
Published: October 2019

The effective asset of power grid is an important basis for the development of power grid enterprises and government regulation. Based on the value and functional characteristics of power grid assets, this paper establishes an evaluation index system for effective asset function of power grids. The analytic hierarchy process and entropy weight method are used to calculate the subjective and objective weights of each functional index, and the subjective and objective weights are combined by the method of squared deviation. The combined weights of the indicators are combined with the value engineering evaluation model to calculate the effective asset value coefficient, which is taken as the effective asset performance value. Finally, the relevant data of a provincial power grid enterprise for 2014-2018 is used. The established model is validated and the calculation results show that the established optimal model is feasible.
The behavior strategies between the government and power generation enterprises considering the learning mechanism based on evolutionary game
Authors: Jiao Jianling , Sun He , Yang Ranran
Published: October 2019

The Renewable Portfolio Standard (RPS) as a policy tool to promote renewable energy development has gone through more than ten years in China. In order to research the strategic interaction between governments and power generation enterprises under the background of energy system transformation and upgrading, a learning mechanism was introduced based on the dynamic reward and punishment mechanism, and an evolutionary game model between the government and power generation enterprises was established. The results showed that the evolutionary stability strategy depended on the dynamic reward and punishment mechanism, which is conducive to the gradual stability of the system. The existence of learning mechanism not only reduced the cost of wind power, but also reduced the probability of government supervision.
Multi-objective Parameters Optimization for HEV Based on improved Particle Swarm Algorithm
Authors: Ai Ying , Gao Yuanjie , Liu dongsheng
Published: October 2019

Hybrid electric vehicle fuel consumption and emissions are closely related to its energy management strategy. A fuzzy controller of energy management using vehicle torque request and battery state of charge (SOC) as inputs, engine torque as output is designed in this paper foe parallel hybrid electric vehicle. And a multi-objective mathematical function which purpose on maximize fuel economy and minimize emissions is also established, in order to improve the adaptive ability and the control precision of basic fuzzy controller, this paper proposed an improved particle swarm algorithm that based on dynamic learning factor and adaptive inertia weight to optimize the control parameters. Simulation results based on ADVISOR software platform show that the optimized energy management strategy has a better distribution of engine and motor torque, which helps to improved the vehicle’s fuel economy and exhaust emission performance.
The Analysis of Influence of the Gangue in the Coal as Fired on the Coal Conveying System and the Boiler Operation of the Circulating Fluidized Bed Unit
Authors: Pan Su , Pengfeng Yu , Liu Linbo , Jing Han , Shen Xiao
Published: October 2019

The coal as fired, with unidentified characteristics of the coal gangue, was burned on a 300MW circulating fluidized bed unit. The equipment of the coal conveying system was damaged and the boiler operation was unstable. In response to the problems, the coal quality data and storage conditions of the coal were examined and the site was spot-checked to evaluate the coal quality characteristics. At the same time, the typical representative parameters of the coal handling system and boiler operation were selected. According to the analysis of coal quality and coal storage, the coal quality fluctuates greatly and the uniformity of particle size distribution is poor. There is actually the coal gangue with hard texture and hard to grind in the coal pile. The coal gangue will have adverse effects on the fine screening machine, fine crusher and other equipment. After burned this type of coal, the fluidized quality of the boiler bed is degraded to make an impact on the safe and stable operation of the boiler. It is recommended that the coal should be screened and then burned into the furnace to ensure safe and stable operation of the boiler.
Research on the general technical standards of the gasoline vapor recovery unit set
Authors: Huang Jin , Zhang Bingquan , Huang Weiqiu , Zhu Zhiping , Tao Feng , Wang Quanzhan , Huang Zhaohui , Zhu Jianjun , Zhang Xiaoxin , Zhang Lin
Published: October 2019

Along with the increasingly strict environmental regulation and the willingness to rapidly promote gasoline vapor recovery management, the development of technology and equipment for gasoline vapor recovery industry grows faster, and the demand for relevant technical standards is also growing. Based on the domestic and foreign development situation of gasoline vapor recovery technology and standard, this article analyzes necessity and urgency of the general technical standards for development of China’s vapor recovery unit, and then it introduces the main technical content of the national standard GB/T 35579-2017 General Specifications of Gasoline Vapor Recovery Unit”, and provides some advices to refine the related technical standards.
Analysis of an Auxiliary Power Supply Transfer Failure of High Speed Transfer Device in an Extended Power Plant
Authors: Zhang Ping , Yang Tian , Zhu Hao-rang
Published: October 2019

In modern power enterprises, the stability of auxiliary power supply is related to the safe and stable operation of units, so the high spee amage in serious cases. This paper could provide reference for safety operation through a case of transfer failure of high-voltage auxiliary power transfer device in an expansion power plant.
Online Estimation of Li-ion Battery SOC for Electric Vehicles Based on An Improved AEKF
Authors: Feng Kaihui , Huang Bibin , Li Qionghui , Yan Hu
Published: October 2019

The purpose of this paper is to discuss how to eliminate the influence of noise time -varying characteristics on the accuracy of SOC estimation. Based on the matlab/simulink platform, the Thevenin equivalent circuit model of the battery is built, and an improved Adaptive Extend Kalman Filter (AEKF) is designed, which is compared with the Extend Kalman filter algorithm (EKF).The simulation results are shown that the improved AEKF algorithm results in effective online estimation SOC and the estimation accuracy is higher than the EKF algorithm.
Influence of intake parameters on combustion and emission performance of dual-fuel Marine diesel engines
Authors: Dend Tao , Huang Jialiang , Hu Deng , Fan Jinyu , Ye Zixiao
Published: October 2019

We in order to study the influence of intake parameters on the combustion and emission of natural gas-diesel dual-fuel Marine engine, AVL_FIRE simulation software was used to build a high pressure cycle model of combustion chamber based on 4190ZLC-2 Marine medium-speed diesel engine. The accuracy of the model was verified by comparing the simulation data with the cylinder pressure curve obtained from bench test. The influence of intake parameters on combustion and emission performance was studied by model simulation. The results show that the combustion quality can be improved by increasing the intake temperature, and the power performance and economy can be improved by appropriate intake temperature. Increasing the intake pressure has the effect of supercharging, appropriately increasing the intake pressure can obtain better power and emission, and can also avoid the rough operation of dual-fuel diesel engine and reduce the noise
Vehicle automatic driving control system based on image recognition
Authors: Gong Fan , Chen ChaoDa
Published: October 2019

With the development of technologies such as intelligent, automatic control and automatic detection, the research of smart cars has been gradually applied to all levels of people’s social life. The design aims to use K60 as the control chip of smart car and combined with image recognition sensor. Identify road condition information, feedback steering gear, motor control, to complete the intelligent driving of the smart car under complicated road conditions. The experimental results show that the control system has good response characteristics, good stability and meets technical requirements.
Small seawater desalination system based on loop heat pipe principle
Authors: Peng Yunhui , Zheng Yuanzhou , Miao Tongyao , Zhou Peiru , Shao Yangshi , Li Liang , Feng Lingzhi , Fang Zheng , Yang Zhang
Published: October 2019

The small seawater desalination system based on loop heat pipe principle by using plate capillary pump technology, a new type of radiator spoiler evaporator and soaking plate finned condenser to realize desktop-class solar seawater desalination system. The Venturi tube principle is used to reduce the internal pressure and energy consumption, and solar photoelectric board with electric heating board function is used to solve problems for areas where there is a shortage of electricity and fresh water resources. Full automatic control system is used to realize the full automatic operation of the equipment.Desktop-class light and small seawater desalination equipment enjoys a broad market prospect. It can not only be used in islands, fishing boats, offshore operating platforms and other complex working scenarios, but also can be used as a large ship freshwater resources emergency equipment.
Modelling of three-reactor system for chemical looping hydrogen generation: identifying a suitable operating range
Authors: Xue Zhipeng , Xu Junfeng , Zhao Minmin
Published: October 2019

Chemical-looping hydrogen generation can produce hydrogen from fossils fuels with inherent separation of CO2. In this article, a novel compact fluidized bed is used for CLHG to solve the problem of low fuel gas conversion causing by thermodynamic limit. Based on the compact fluidized bed, a modelling of three-reactor system for CLHG process is built to study the operating range of this system. The results show that the low limit of the system temperature is 650°C, or else unexpected reaction will occur in reactors. The system can achieve heat-integrated by mixing a certain amount of inert support into oxygen carrier and adjusting a suitable temperature different among reactors. Moreover, an operational range of the oxygen carrier recycle rate between 6 and 8 mol Fe/mol CH4 is recommended for more extensive operating region and relative higher CH4/H2 ratio can be obtain. Finally, a fitting formula described the operating range of this system is proposed to provide a reference for the experiment and simulation in further work.
Analysis and Treatment of Abnormal Vibration of a Gas Turbine Generator Set
Authors: Bing Hankun , Zhao Yuzhu , Wu Zhengfeng , Pang Le
Published: October 2019

In this paper, The turn-to-turn short-circuit fault is accurately judged by the vibration monitoring of a gas turbine generator set. The abnormal conditions in the post-processing process are analyzed and summarized, and the conclusion is verified by the disintegration.The analysis method of abnormal response in the process of dynamic balance of units is determined, which provides a reference for effect evaluation and scheme determination for the on-site dynamic balance treatment of the same type unit.
The Relationship Between Load and Electricity Price in Different Time Periods Based on Granger Causality Test
Authors: Wen Ming , Chen Yong , Chen Fenkai , An Lili , He Qing , Fu Chengran
Published: October 2019

With the liberalization of the market on the selling side, the user’s electricity load shows a stronger volatility, and correspondingly, the price change has a certain degree of dynamics. This paper first selects the working day load of a certain power market to realize the peak-valley period division. Secondly, with the help of Eviews software package, studying the causal relationship between load and electricity price in different time periods, the following conclusions are obtained: the peak time period electricity price has a one-way causal relationship with the peak time period load, and there is a low causal relationship between the electricity price and the electricity load during the flat time period; the valley time period electricity price has a two-way causal relationship with the electricity load.
Analysis on the Impact of Geomagnetic Storm on Reactive Power and Voltage in Extrahigh Voltage Power Grid
Authors: Kang Lan , He Bin , Yang Peihong , Dong Xiaoling
Published: October 2019

With the growing scale of the power grid and the improvement of the voltage level, the geomagnetically induced currents (GICs) generated by geomagnetic storms has become one of the leading factors that cause large-scale power outages in power grid. Considering the global simultaneity characteristic of geomagnetic storms, this paper presents the concept of mass reactive power disturbance for the first time, analyzes the mechanism of GIC reactive power loss of transformer and reveals the mechanism of mass reactive power disturbance’s influence on voltage. Finally, combined with the practical situation of 750kV EHV power grid in China, the reactive power loss and voltage distribution under the geomagnetic storms at various intensities are calculated, with the grid operating in two typical modes, and the impact of the geomagnetic storm on voltage is illustrated, which provides the theoretical basis for the study of voltage stability.
Short-term Load Forecasting Model Considering Meteorological Factors
Authors: Yunhua Xi , Haojun Zhu , Nan Dong
Published: October 2019

Because of the limitation of basic data and processing methods, the traditional load characteristic analysis method can not achieve user-level refined prediction. This paper builds a user-level short-term load forecasting model based on algorithms such as decision trees and neural networks in big data technology. Firstly, based on the grey relational analysis method, the influence of meteorological factors on load characteristics is quantitatively analyzed. The key factors are selected as input vectors of decision tree algorithm. This paper builds a category label for each daily load curve after clustering the user’s historical load data. The decision tree algorithm is used to establish classification rules and classify the days to be predicted. Finally, Elman neural network is used to predict the short-term load of a user, and the validity of the model is verified.
Multi-energy Network Model of Virtual Energy Router
Authors: Chen Yang , Zhang Luqing , Chen Aikang , Zhang Yanchi , Xie Da
Published: October 2019

Energy router is the main equipment of energy Internet to interact through energy and information. This paper proposes the routing algorithm of the virtual energy router composed of multiple energy routers and constructs the multi-energy coupling correlation model, and combines internal routing algorithm of the virtual energy router with multi-energy correlation model to plan the capacity of energy routers in the regional energy network composed of multiple parks. The simulation shows that the planning method based on the routing algorithm improves the energy, environment and economic benefits of the regional energy wide area network.
Construction and Case Study of Flexibility Evaluation System for Power Generation Enterprises in the Auxiliary Service Market
Authors: Le Ying , Zhou Baozhong , Zhu Wenbin
Published: October 2019

At present, the flexible transformation of thermal power is an effective measure to solve the problem of renewable energy consumption. At the same time, the improvement of the electricity auxiliary service market makes the power generation enterprises improve their ability to provide auxiliary services through flexible transformation and obtain benefits while serving the power system. Therefore, how to construct the flexibility evaluation system of regional units according to the characteristics of the auxiliary service market in different regions is of great significance to power generation enterprises. In this paper, the flexibility evaluation system of the auxiliary market environment is designed. Analytic hierarchy process and fuzzy comprehensive evaluation method were used to determine the weight and final evaluation basis.
Study and Implementation of a Cost-Effective 3L-Active Rectifier for DC Collection in WECS
Authors: Luqman Muhammad , Yao Gang , Zhou Lidan , Yang Di , Lamichhane Anil
Published: October 2019

Power electronic converters are widely used in wind energy conversion system (WECS) applications. Therefore, with the increasing manufacturing capacity of multi-MW wind generators, multi-level converters, or parallel configuration of converters are becoming more attractive solutions towards DC collection from the wind generator. Among the multilevel converters, three-level full-scale neutral point diode clamped (3L-NPC) converter are using extensively for such applications in order to reduce the voltage stress on the semiconductor devices. In this article, a comparative study based on several devices used by NPC, capacitor clamped (CC) as well as Vienna rectifier has been done. Furthermore, their estimated cost comparison and complexity of control switches have been debated. By keeping in view the merits and demerits of these rectifiers, a low cost three-level active rectifier having a smaller number of active switches with a simple control scheme have been implemented. Considering a three-phase electric grid as a generated source, a 2.2KW low-cost three-level Vienna rectifier is simulated using MATLAB/Simulink. DSP (TMS320F28335) based experimental results ratify the simulated circuit with THD<5%.
Design of Double-drive Mechanism for Energy Saving Lifting Permanent Magnet
Authors: Ding Ning , Liu Chao , Duan Jingsong , Jiang Shuna
Published: October 2019

On account of great power consume of lifting electromagnet, energy-saving lifting permanent magnet has got more attention. But in the exiting design of lifting magnet, most can only lift the workpiece placed horizontally, and can’t lift the workpiece placed inclined. Aiming at this defect, the authors design the double-drive mechanism. In this design, two sets of tumble, cylindrical gear mechanism and ratchet pawl mechanism were used to ensure that at least one set of mechanisms can work properly in the inclined state. To enable the two sets of mechanisms to drive the rotating magnetic system in the same direction, reversing gear was adopted.
Research on MPPT Based on Fuzzy Auto-disturbance Rejection
Authors: Ma Chuang , Li Hong , Gong Zhenyu
Published: October 2019

For the classical maximum power point tracking algorithm, the setting of small step increases the speed of maximum power tracking of photovoltaic power generation system and the stability of operation in stable state. To solve this problem, this paper designs a maximum power point tracking system based on booster circuit, and adopts fuzzy auto-disturbance rejection control to improve the conductance increment method with variable step length. Based on the relationship between the rate of conductance change and the maximum power point conductance, the step size of the adrc is adjusted by using the fuzzy logic control. The MPPT system of photovoltaic power generation is designed by combining the incremental conductance method and the improved fuzzy control method with the correction factor. The control method does not depend on the mathematical model of the system, the design is flexible, the control effect is robust, stable and accurate. It can be used for reference for other types of solar photovoltaic power generation control system.
Research on Threshold Effect of Environmental Regulation and Green Total Factor Productivity
Authors: Cao guangyuan , Dong zhiyuan , Zhang zenglian
Published: October 2019

This paper selects the panel data of 30 provinces in China from 2005 to 2016, and uses the threshold effect model to analyze the correlation between environmental regulation and green total factor productivity (GTFP). The results show that: The impact of environmental regulation on GTFP is non-linear and has a double threshold effect. Therefore, the local governments of all provinces should continue to play a positive role in environmental regulation, reasonably adjust the level of environmental regulation according to local specific economic development and industrialization level, etc., and strive to promote the transformation of medium and high polluting enterprises to green environmental protection enterprises..
Analysis of Key Elements of Emergency Response Ability of Hazardous Chemicals Based on AHP Method
Authors: Yang Fengfeng , Gai Ke , Cao Feng , Yang Rili , Zhang Jufeng , Wang Siyang , Su Ruiqing , Bai Liping , Yu Lan
Published: October 2019

A evaluation system was constructed and each weight of the indexes was calculated based on the principle of AHP (Analytic Hierarchy Process), which were benefit of safety and sustainable development of chemical enterprise, emergency response capacity, accidents numbers and property losses The results show that emergency prevention capability and emergency preparedness capability are the key elements in the first-level indicator system. The plan initiation, drill, hazard source control and monitoring and early warning, emergency command, coordination and rapid response capability are the key elements in the secondary indicators.
Study on the Current Status and System of Water Reuse Standardization in China
Authors: Zhang Xiaoxin , Huang Jin , Lin Ling , Zhang Sinan , Ding Qing
Published: October 2019

The paper examines the requirements of domestic policies and plans for water reuse standardization work, analyzes the current status and existing problems of domestic water reuse standards, builds China’s water reuse standard system and conducts an in-depth study on the structure and composition of the standard system.
A Study of On-site Shale Gas Detecting Device Based on Mass Spectroscopy
Authors: Sun Haoyu , Pei Xueliang , Liu Dan , Sun Jinwei , Zhou Jun
Published: October 2019

As unconventional gas preserved in organic-rich shale and the intercalary strata, shale gas cannot be effectively explored and developed effortlessly. Considering that gas content detecting is time consuming in shale gas exploitation process, an on-site detecting method was raised in this paper for shale gas components and concentrations. By software programming, online process control was achieved. In combination with a high-precision mass spectrometer, such a method can be used to fulfill the change from off-line detection to real-time automated measurement. In addition, a system prototype was developed by hardware design made based on the design flow. As proven by experiments, the entire set of experimental equipment completely satisfies industrial production requirements and its pressure-maintaining and explosion-proof function is applicable to various operating conditions, which fills in the gaps in shale gas component and concentration on-site detecting devices of China.
Characteristic Analysis of Abnormal-Weakening Summer Precipitation in Tianjin under the Influence of Bohai Sea High
Authors: Xu Changyi , Wang Yan
Published: October 2019

To investigate the characteristics of Bohai High, the daily precipitation data of Beijng-Tianjin region during June to September from 2006 to 2015, national basic automatic weather stations data of 5 minute, NCEP/NCAR 1°×1° reanalysis data as well as CINRAD/SA data of Tianjin, from the definition of and the distribution characteristics of precipitation in Beijng-Tianjin region, the concept of regional precipitation reduction in summer in the context of Bohai High was given. This was done by classifying large-scale synoptic circulation and synthetic diagnosis method. The results show that: (1) Bohai High has the most significant effect of abnormal weaken precipitation in the eastern of Tianjin, while has a relatively mild effect in the northern of Tianjin. (2) According to the characteristics of large-scale circulation situation, the synoptic processes over heavy rain are classified into three patterns: upper-level trough pattern (I), cold vortex pattern (II) and the interaction between subtropical high and western trough (III). Except that water vapor come from the Bohai Sea and the Yellow Sea for Type II, for the other two patterns the water vapor were related to remote supplies from the South China Sea and the East China Sea. The Bohai High of Type Iand III were thick warm negative vorticity system whereas the Type II was a shallow negative vorticity system. (3) The abnormally weakened of Bohai High were related to their depths and duration, the deeper and the longer duration of Bohai High, the stronger weakening effect on the precipitation in Tianjin.
Environmental Advocacy Dilemma on Tin Mining Communities in Bangka Belitung
Authors: Ibrahim Ibrahim , Haryadi Dwi , Wahyudin Nanang
Published: October 2019

Tin mining generally results in massive environmental damage. This condition occurs in Bangka Belitung as an area rich in tin natural resources. Due to the environmental damage, tin mining in this area runs along with several rejection of the mine. Environmental activists will generally assist the community in carrying out resistance movements. However, environmental activists will face various dilemmas in advocacy. This paper discusses how the environmental advocacy dilemma in the tin mining community in Bangka Belitung. The study model used is a qualitative model by collecting data in the form of in-depth interviews and conservation. This study found four important things, namely: first, the tendency of society to split in two different attitudes in the context of tin mining. The gap focused on at least 10 dimensions of attitude difference. Second, the study found that the environmental advocacy movement generally centered on the aspect of rejecting the existence of tin mines in the sea and coastal areas as well as Watersheds (DAS). Third, environmental activists are always faced with intimidation and pressure from paid groups by investors. Environmental activists generally face back pressure from counter-pressure groups. Fourth, this study also found that people tended to be apathetic towards the environmental advocacy movement, some of them because they were worried about pressure and partly because they felt unaffected or directly related. The study also found that apathy also arises because of the pragmatism of the people in certain regions which are actually accommodating to tin mining.
Application Research of Information Technology in Environmental Protection
Authors: Yang Xianli , Ren Lili , Li Ning
Published: October 2019

With the rapid development of information technology, the application of information technology in the field of environmental protection tends to be frequent, which is of great significance to environmental protection. This paper analyzes the application status and existing problems of information technology in the field of environmental protection from the aspects of monitoring, benefit evaluation and prevention, and puts forward the application of information technology in the field of environmental protection from three perspectives: constructing carrier, building platform and innovation mechanism. The path is intended to provide valuable advice to relevant researchers for reference.
Optimization and GIS-based combined approach for the determination of sites and size of biogas plants for a whole region
Authors: Ouyang Sanchuan , Zhu Hongguang , Chen Junjie , Zhao minqi
Published: October 2019

To make better use of agricultural residues and solve the problem of residues pollution, it is necessary to carry out regional management, which means spatial planning of the entire region is essential. This study developed a methodology based on GIS for determining the suitable locations, optimal sizes and number of biogas plants for the entire region while meeting the conditions that all biomass can be collected. Based on the optimization of transportation distance, the nearest facility model and the modified location allocation model were used to obtain the correspondence between plants and supply points, the transportation path and the plants’ capacity under different numbers of plants. Based on economic optimization, the economic model was constructed to calculate the total cost of different numbers of biogas plants and the optimal number was obtained after comparing. The cross path was adjusted for the selected plan to ensure that there was no crossover in the plants’ collection area. This approach was applied (as a case study) in Funan County, Anhui Province. Based on the existing results, the optimal construction number of biogas plants in the region was 9.