bluuebunny/crossref_metadata_2025_split huggingface dataset:
A water level dynamics simulation model of AP1000’s steam generator based on Åström-Bell model
Authors: Huan Lei , Weide Huan 
Published: September 2019

Abstract
The steam generator (SG) is a crucial component of the AP1000 pressurized water reactor (PWR) nuclear power plant systems. The operational stability of SG must be considered for entire nuclear power system’s safety and availability. The presence of steam bubbles under the water level in the steam generator causes the shrink and swell phenomenon. It makes the water level control problem of SG complex. Therefore, a relatively simple lumped parameter model that agreed well with experimental data of SG was presented. First, a moderately complex fourth order nonlinear mathematical model of AP1000 U-type steam generator was established based on Åström-Bell model. Second, the simulation platform was built and then the simulation was conducted in MATLAB/Simulink environment. Finally, the model parameters were obtained from estimating from the standard AP1000 test data and the simulated results were compared with the standard test data. The results showed that the model could capture the dynamic fluctuation of water level in AP1000 SG over a wide operating range.
Research on effect of lightning shielding level of EHVDC transmission line by installing coupling ground wire
Authors: Zou Yanhui , Yue Yishi , Huang Fuyong , Wang Haiyue 
Published: September 2019

Abstract
Lightning shielding failure is the main reason causing lightning flashover of Jiangcheng EHVDC transmission line because of the designed ground wire protection angle. Based on the electric-geometry model, a simulation model including the coupling ground wire is established by using MATLAB. The effect of the coupling ground wire at different height and horizontal position on lightning shielding failure flashover rate is analysed. Results show that coupling ground wire can reduce the lightning shielding failure flashover rate and the lightning shielding performance increases with the increase of the height of the wire and the horizontal distance between the axis of the tower and the coupling ground wire.
Research on observation method of leader discharge thermal expansion based on quantitative schlieren technique
Authors: Yue Yishi , Zou Yanhui , Wang Haiyue , Huang Fuyong , Wang Cheng 
Published: September 2019

Abstract
Lightning is one of the main causes of UHV DC transmission lines trip-outs. To measure the leader discharge thermal expansion of leader could help us to have an in-depth understanding of the lightning protection. In this paper, a temperature measurement system based on calibration schlieren principle is developed in the first place. Combined with a high speed camera, the spatial resolution of this temperature measurement system is 100 μm/pixel. Secondly, the image process is discussed in this paper. Thirdly, the temperature distribution of an alcohol lamp is obtained by using this system. It shows a good agreement with the measurement results of precision thermocouple which validates the effectiveness of the developed temperature measurement system. Finally, this system is used to acquire the thermal expansion of leader discharge voltage in a 1m rod-plane gap, and the measurement results are discussed.
Research on Target Magnetic Properties Based on Multi-magnetic Dipole Model
Authors: Xu Chaoqun , Huang Kui , Dai Jialong , Meng Lifei , Yi Zhong 
Published: September 2019

Abstract
It is difficult to accurately analyze and master the magnetic properties of irregular objects with complex internal magnetic structure. In this paper, the multi-magnetic dipole model of magnetic target is established. The magnetic field data around the magnetic target are measured by magnetometer array, and the position of the multi-magnetic dipole is searched by genetic algorithm, and the fitting error is detected at the same time. The experimental results show that the magnetic field model established by this method has high accuracy and the errors of magnetic field and magnetic moment are less than 5%. This method is beneficial to the research and engineering application of magnetic properties of objects.
Experimental study on thermal performance of roof and floor capillary radiant heating systems
Authors: Zou Hang , Long Enshen , Zhang Yin , Ding Pei 
Published: September 2019

Abstract
This research picks up the bedroom and study of a residential building in Chengdu as the research object. The temperature variations in the supply water of the room, the surface temperature of roof and floor, and the indoor air is analysed when the capillary ends were located on the roof and the floor respectively. Furthermore, the internal mechanism of the different heating environments of the two heating modes is revealed by analysing the heat flux density. The results show that: under the same water supply temperature and flow rate, the thermal response time of the roof radiant heating is shorter and the stability of the surface temperature of the floor radiant heating is better due to the different thickness of the capillary network. The floor heating room has more uniform distribution and better comfort. The heat transfer characteristics of the roof and floor surface are different, and the variation of the radiation and convection heat transfer amount are also different. The heat flux density of the roof increases faster and the maximum value can be reached in only 60 minutes, while the floor needs 156 minutes. The roof heating is about 4.36% higher than the floor heating in the proportion of radiation heat exchange. Thus, roof radiant heating is preferred for intermittent heating. This paper provides a reference when designing the end of the residential heating systems.
Microwave-assisted Chelating Agent Extraction of Pectin from Hawthorn Wine Pomace
Authors: Chen Xiaowen , Zhu Chuanhe 
Published: September 2019

Abstract
Pectin was extracted by microwave-assisted chelating agent (sodium hexametaphosphate) method from hawthorn wine pomace. Based on single factor experiments, the effect of chelating agent dosage, solid-liquid ratio, microwave power and microwave time on extraction rate of hawthorn pectin was evaluated by response surface methodology. The results showed that factors of effect on extraction rate in order from large to small were solid-liquid ratio, chelating agent dosage, microwave time and microwave power. The best process factors were: chelating agent dosage of 1.35 %, solid-liquid ratio of 1:9, microwave power of 440 W and microwave time of 80 s. Under these conditions the average extraction rate of hawthorn pectin was 72.89 ± 0.45 %, which was basically consistent with the predicted value. It was showed that this model was reliable.
Thermodynamic Analysis on Hydrogenation Process of Phenol of Bio-oil Model Compound
Authors: Liu Liping , Li Yingfan , Cui Yu , Fang Shuqi , Wang Kai , Chen Junying , chun Chang , Li Hongliang 
Published: September 2019

Abstract
In this paper, the thermodynamics on the hydrogénation of phenol as a model compound of bio-oil was simulated based on Gibbs free energy minimization. The reaction system was determined according to the reaction mechanism of the phenol hydrogenation and the effects of reaction conditions on the equilibrium products were studied. The results show that benzene and cyclohexane are easily formed thermodynamically under reaction conditions. For the reaction system of selective hydrogenation of phenol to cyclohexanol, low temperature, high pressure and high molar ratio of hydrogen to phenol can improve the conversion of phenol and the selectivity of cyclohexanol. The optimum thermodynamic conditions for the hydrogenation of phenol to cyclohexanol are as follows: reaction temperature 400-600 K, reaction pressure 3.0-7.0 MPa, molar ratio of hydrogen to phenol 4.0-7.0. The simulation results are compared with the related experimental results.
Research on Carrier Recovery Algorithm in Coherent Optical Communication System
Authors: Liu Jiaoyang 
Published: September 2019

Abstract
In coherent optical communication system, the random deviation of optical phase which is caused by the spontaneous emission of laser leads to phase noise, resulting in a random rotation of signal constellation. In order to ensure the reliability of the communication system, carrier phase estimation and recovery are required at the receiver. In this paper, we investigate two traditional carrier phase recovery (CPR) algorithms, including Viterbi&Viterbi phase estimation (VVPE) and blind phase search (BPS) algorithm. On this basis, we also discuss seven improved algorithms. Then we compare and analyze the hardware complexities of eight different CPR algorithms. In addition, the cause of equalization enhanced phase noise (EEPN) and its impact on the carrier phase recovery algorithm are also discussed.
Molybdenum Addition Enhancing the Corrosion Resistance of Ni16Cr Alloy in Aqueous Solution
Authors: Q.G Cheng , Jianting Li , Weiliang Xiong , Yang Tangying , Liu Zhao , Wang Yueping , Shi Yongbing 
Published: September 2019

Abstract
The influences of Mo on the structures and the electronic properties of passive films on Nil6CΧMo (Χ=0wt.%, 2wt.%, 5wt.%, 8wt.%, 12wt.% and 16wt.%) alloys in pH 1.0 sulfuric acid solution, pH 8.5 borate buffer solution and pH 13 sodium hydroxide solution were investigated using X-ray photoelectron spectroscopy (XPS), potentiodynamic polarization curve, Electrochemical impedance spectroscopy (EIS) and Mott-Schottky plot. The results showed that the addition of Mo can evidently refine the microstructure of Ni16Cr alloy, and the grain size sharply decreased with increasing Mo. Ni16Cr alloy was passivated in pH1 sulfuric acid solution, pH8.5 borate buffer solution and pH13 sodium hydroxide solution, each passive current density decreased and each passive potential region enlarged with the increment of Mo. XPS results showed that the passive films on Ni16CΧMo alloys were mainly composed of the inner Cr2s3 layer and the outer NiO layer with a little amount of Cr2S3, NiS and NiSO4. The resistances and compactness of the passive films on Ni16Cr alloy in the three solutions increased with the increased Mo, which implyed the enhanced protection of the passive film. Mott-Schottky plots revealed that the passive film on Ni16Cr alloy appeared the p-n heterojunction, the defect number of the outer film increased with the increment of Mo, while for the inner film, the defect number decreased with Mo, while the total protection of the passive films to the metal matrix was improved with increasing Mo.
Study on A-TIG welding of Q245R/321 dissimilar steel
Authors: Zhang Rijun , Wu Qiyou , Wang Lin , Zeng Chao , Wang Xiangjiang 
Published: September 2019

Abstract
This paper mainly studies the welding of stainless steel 321 and carbon steel Q245R dissimilar steel. Welding tests of stainless steel 321 and carbon steel Q245R are carried out by A-TIG welding method. The effect of active agent on weld penetration, weld formation and inner hole slag inclusion is studied. The mechanical properties of welded joints is measured by tensile and bending mechanics tests, and the macroscopic and microscopic structures are observed. Furthermore, these tests and research results are compared with conventional TIG welding. The results show that the welding of dissimilar steel with A-TIG welding method is well formed, and there are no pores, cracks and slag inclusion in the weld. The weld microstructure of the two welding methods is mainly austenite and ferrite. In the Q245R side heat affected zone (HAZ), the migration of carbon elements is obvious, but the A-TIG welding joint is superior to the conventional TIG welding in strength and toughness.
Advances in research on repairing heavy metal pollution in soil by clay minerals
Authors: Na Wang 
Published: September 2019

Abstract
To reveal the repair potential and effect of clay minerals on heavy metal contaminated soil, this paper summarizes the application of common clay minerals such as kaolinite, montmorillonite and zeolite in the repair of heavy metals, and repairs heavy metals with clay minerals and biochar, lime and chelating agents. Correlation analysis illustrates the potential and mechanism of clay minerals for heavy metals. For one thing, clay minerals have a large specific surface area and a negative charge on the surface, which greatly increases their adsorption properties for heavy metals. for another, clay minerals have high nutrient elements and rich organic matter, Which increase soil fertility and trace elements, as well as crop yield. Clay minerals have been widely used in soil heavy metal pollution repair, but most of them still stay at the laboratory level. In the future, more attention should be paid to the application of clay minerals in practical engineering.
Discussion on Factors Affecting the Removal of Organic Pollutants in Reverse Osmosis Concentrated Water of Landfill Leachate
Authors: Huang Xing Hua , Chen Qiu Lin , Xin Peng , Liu Hong , Jia Zhen Fu 
Published: September 2019

Abstract
Landfill leachate reverse osmosis concentrated water (RO concentrated water) is a kind of wastewater with high organic matter concentration, chemical oxygen demand (COD), turbidity, and chroma. The RO concentrated water is pretreated using coagulation method; then the coagulation effect of FeCl3, Fe2(SO4)3, Fe(NO3)3 and PAC on the leachate RO concentrated water is investigated in the experiment. The result shows that FeCl3 is the best coagulant. The removal rate of total organic compounds (TOC) reaches the highest (92.23%) under the condition of 8.0 g/L FeCl3 dosage, pH=6, 3 mg/L PAM, and 150 r/min rotation speed, and the removal rate of COD, NH3-N, and chroma are 73.91%, 28.3%, and 79%, respectively.
Process and development of ozone-biological activated carbon treatment for micro-polluted raw water
Authors: Du Zhehua , Lin Xin 
Published: September 2019

Abstract
The basic principle and process flow of ozone-biological activated carbon treatment of micro-polluted source water were analyzed, and the application of the method at home and abroad was introduced. Some problems that need to be paid attention to when applying the method were put forward. The results show that ozone-activated carbon water purification technology can effectively remove organic matter and ammonia nitrogen in water. It also has good removal effect on inorganic reducing substances, chroma and turbidity in water. Moreover, the mutagenic activity of effluent can be effectively reduced to ensure the safety of drinking water. Some problems which should be attended are prompted when this technique is in application in the paper. It is a water purification technology worth promoting.
Synthesis of a novel type of difluoro (tetrafluoro) pyrazole amide insecticide
Authors: Mingming Zhang , Jianxin Sun , Minghui Wang , Liangzhong Xu 
Published: September 2019

Abstract
Chlorantraniliprole was used as a lead compound to design and synthesize two novel fluorine-containing pyrazole amide compounds. Their strectures were confirned by 1H NMR and HRMS. Their insecticidal activities were evaluated by against plutella xylostella and chilo suppressal. The results of insecticidal activity test demonstrated that the two target compounds have better insecticidal activity against plutella xylostella and chilo suppressalis than the commercial chlorantraniliprole.
Application of A High Efficiency Composite Denitration Agent in Ceramic Roller Kiln Flue Gas Treatment: A Case Study
Authors: Huang J H , Tang Z J , Fang P , Zeng W H , Tang Z X 
Published: September 2019

Abstract
With the increasing stringent environment pollution emission standards, the ceramic industry is facing a great challenge of NOx control. The research and application of highly efficiency deNOx technologies for ceramic roller kiln are benefit both to ceramic industry and environmental protection. Selective non-catalytic reduction (SNCR) is among the leading edge of the hotspot of NOx control. However, most of the reported investigations were laboratory scale study, which were limited to representing the performance of SNCR denitration agent at real application. In this study, we compared the performance of a self-made denitration agent with traditional ones, and the effect of spraying rate and position on NOx removal efficiency were investigated at a 20000 m2/h ceramic product line. Besides, a continuous experiment was carried out. By the work conducted in a real gas, a number of first-hand data focusing on SNCR technology for deNOx of ceramic roller kiln and its possibility of coupling with existed wet absorption process were shared in this paper.
Effects of Living Pterocypsela laciniata and Its Straw on Nitrogen Uptake of Grape Seedlings under Selenium Stress
Authors: Yang Liu , Huan Yunmin , Lin Lijin , Liao Ming’an 
Published: September 2019

Abstract
Pot experiments were conducted to investigate the nitrogen (N) uptake of grape seedlings by intercropping and straw applying of Pterocypsela laciniata. The results showed that five treatments: the monoculture of grape, grape intercropping with P. laciniata, the root straw of P. laciniata applied, the stem straw of P. laciniata applied and the leaf straw of P. laciniata applied. All treatments significantly increased the content of total N in grape roots, leaves and shoots of grape seedlings. The straw applying significantly increased the content of total N in grape stems, and the stem straw of P. laciniata had the greatest effect on promoting N uptake of grape. When the stem straw of P. laciniata was applied, the soil alkali solution N content was increased by 9.93%. Therefore, applying stem straw of P. laciniata can not only promote N uptake by grape but also increase soil alkali solution N content.
Experimental investigation of the effect of salt wedge on concentration of suspended non-cohesive particles in turbid flow
Authors: Yin Xiaoling , Yang Bangjian , Ying Zeng , Huang Shuqin , Yu Lanxin , Lu Chen 
Published: September 2019

Abstract
To have an insight of the effects of salt wedge on suspended sediment concentration (SSC), we carried out experiments of intruding salt wedge in flume with fresh turbid water of non-cohesive particles and salt water free of sediment. Two sets of Acoustic Doppler Velocity Profiler (ADVP) were used to record instantaneous velocity profiles in the saline affected zone near the bed. The acoustic back scattered signal amplitudes (AMP) in the measurements were used to estimate SSC at the same point and the same time. The results show that around the interface shear of exchange flow is remarkable and SSC increases noticeably. Flow analysis indicates that large scale turbulence from interfacial instability is the main power source to enhance sediment carrying capacity of the flow. It weakens and retards the particles in the upper turbid layer sinking to the lower saline zone. However, the energy dissipation doesn’t show much change.
Experimental study on sand solidification with microbial cement
Authors: Fengling Ma , Rong Li , Yao Xu , Saojiang Wang , Mingdian Fang 
Published: September 2019

Abstract
Selecting four types of sand with different ranges of particle diameter, the strength tests of sand solidification with microbial cement are carried out in this paper. With experimental conditions in this paper, most of the strengths of solidified sand with microbial cement are in the range of 1.2∼2.7MPa. Particle gradation is an important factor that affects the solidification of microbial cement. And the perfusion method is more suitable for the sand with appropriate porosity and good connectivity which is easy to be perfused, but not for clay and sludge. The stirring molding method is more suitable for clay and sludge which have much content of fine powder. The strength of solidified sand is related to the direction of perfusion; and the strength of its upper part is higher than that of the lower part. Compared with other solidification materials, the solidified sand with microbial cement has no obvious advantages, due to its low strength, many limitations as well as complex construction technology; dnd its application field needs further study and exploration.
Magnetic fabric study of the Keziletage pluton in east part of southern TianShan and its tectonic implications
Authors: Huawei Wang , Nan Zhao , Changhong Yan , Wei Xiao , Chi Zhang 
Published: September 2019

Abstract
The Keziletage pluton which plays an important role in studying the nature of continental lithosphere and restraining the tectonic evolution of the Southern TianShan orogenic belts is located in the middle of the Keziletage synclinorium, a secondary tectonic unit of the South TianShan syncline fold belt. Emplacement mechanism of the Keziletage pluton in Xinjiang is studied through detailed analyses of magnetic fabrics. Data from 28 sampling sites within the pluton show that the value of the average susceptibility (K
m
) is high. The corrected anisotropy degree (P
j
) is less than 1.2, which can be an indicator of flow magnetic fabrics. The shape parameter (T) of magnetic susceptibility ellipsoid displays that the Keziletage pluton is dominated by oblate compression fabric. Although the magnetic fabrics show NE-SW compression as a whole, the magnetic lineations are little over magnetic foliations. We suggest that the collision of Tarim blocks to YiLi-mid TianShan micro-plate became much weaker during the emplacement when the regional tectonic setting was changing to extension environment.
Experimental study on the effect of filler size on the denitrification of SBBR process in low temperature
Authors: Bian Dejun , Yan Yiming , Wu Ji , Ai Shengshu , Wang Fan , Nie Zebing 
Published: September 2019

Abstract
In order to study the effect of filler size on the treatment of low temperature wastewater by SBBR process, three groups of SBBR reactors were established. They used cubic sponges with side lengths of 1, 1.5 and 2cm as filling fillers, respectively. The denitrification effect of the three fillers was compared under the conditions of stable water temperature of (10±1)°C, HRT of 10h and reactor filling rate of 16%. The results showed that the removal of NH4+
-N and TN in the reactor with the filling size of 1cm was the best, and the removal rates were 96% and 80%. The NH4+
-N and TN removal rates of the reactors filled with the other two sizes of fillers were all below 80% and 70%. The membrane biomass measurement of the reactor showed that the smaller size of the filler has a larger specific surface area, which was beneficial to mass transfer and microbial growth and enrichment, thereby promoting the denitrification of low temperature wastewater.
Girder crack of concrete single pylon cable-stayed bridge
Authors: Yong-jian Zuo , Deng Li , Sheng Zhang , Li-rong-jun Ying 
Published: September 2019

Abstract
Taking the reinforcement and maintenance project of a concrete cable-stayed bridge as the background, aiming at the stress cracks on the web of the box girder of the main bridge after several years of operation, starting from the actual situation of design and construction, the integral calculation model of the bridge is established by Midas Civil and the local analysis and calculation model of the main girder is established by the general finite element software. Four kinds of analysis and calculation models are analyzed. Finally, it is shown that the web cracks of the bridge are caused by the cable tension when the bridge is cantilevered. On this basis, the concrete and feasible bonded steel plate method is proposed to repair and strengthen the cracks, which is of certain reference significance for the reinforcement and maintenance of the same type of bridge cracks in the future.