bluuebunny/crossref_metadata_2025_split huggingface dataset:
Assessment of Long-Range Guided-Wave Active Testing of Storage Tanks
Authors: Cailly William , Walaszek Henri , Brzuchacz Sebastien , Zhang Fan , Lasaygues Philippe 
Published: February 2021

Abstract
Guided Wave Testing (GWT) is now increasingly being used for the non-destructive testing of large structures. Petrochemical tank bottoms are particularly subject to corrosion. Today, the monitoring of corrosion in storage tanks is probably one of the most challenging applications of GWT because of the size and the complexity of such medium. This article deals with the main physical issues of this application, in particular, the prediction of the elastic field propagating in the tank wall and bottom, and the prediction of guided wave scattering by joints. Drawing on current research work, a representative numerical configuration is defined. The global diffusive effect and the local diffraction effect of the lap joints are studied. The methodology have led us to focus on the low ultrasound frequency range: from 10 to 50 kHz. A quantitative evaluation of the scattering by lap joint is carried out by means of simulations and experiments on elementary reduced scale joints. Dynamic range computations make it possible to get prior knowledge about the minimum signal-to-noise ratio (SNR) required to get information about the tank bottom, for a given configuration, leading to a SNR-resolution trade-off. The method can be extended to larger tanks. The results confirm that the use of GWT technology for long-range active testing and imaging of storage tanks is promising.
Preparation of laser markable polyamide compounds
Authors: Li W H 
Published: February 2021

Abstract
Laser marking technique has been increasingly used in electrical and electronic industry in the recent decades for scanning and control purpose. Laser marking is superior to the traditional labelling techniques in terms of speed, flexibility and duration. The mechanism of laser marking is either blackening by carbonization or brightening by microbubbles, upon the effect of laser on the base. Normally laser marking additives were introduced in order to achieve the controllable marking effect. In this paper, a light-on-dark laser markable polyamide compound was studied with the leveraged properties of mechanical, physical and laser marking effect.
Biodegradable wet-spun fibers modified with antimicrobial agents for potential applications in biomedical engineering
Authors: Felgueiras H P , Homem N C , Teixeira M A , Ribeiro A R M , Teixeira M O , Antunes J C , Amorim M T P 
Published: February 2021

Abstract
Wet-spinning is a non-solvent induced phase inversion technique that allows the production of continuous polymeric microfibers, with a uniform morphology, based on the principle of precipitation. It allows the production of 3D fibrous constructs with an intricated architecture that facilitates cell infiltration, something that is very limited in electrospun nanofibrous mats, thus increasing its interest in biomedicine. Wet-spun scaffolds are also more easily processed and can be loaded with a variety of biomolecules of interest. Antimicrobial agents that display a broad spectrum of activity against bacteria, fungi and viruses have been combined with such constructs demonstrating great potential to fight infections. In the present work, we explore the use of wet-spinning to process both natural and synthetic biodegradable polymers in the form of microfibers, and the necessary processes to modify their surface to increase their antimicrobial profile. The synergistic potential of specialized biomolecules within wet-spun fibrous architectures are also highlighted.
A novel catalyst prepared from black liquor for biodiesel conversion: An optimization study
Authors: Sun Y , Liu J Z , He H Z , Wang Y X , Yang G , Liu Y Y , He J , Xiao X 
Published: February 2021

Abstract
This paper reports a new approach for high-value conversion of black liquor into biochar to catalyse the transesterification for biodiesel conversion using waste fry oil (WFO). The central composite design (CCD) and response surface methodology (RSM) were employed to optimize the biodiesel preparation using the catalyst prepared from the paper pulp black liquor precipitated biochar. The transesterification reaction is catalysed by oxidative functional groups (enolic) on the surface of biochar. The effect of alkaline loading in biochar, carbonization temperature, the methanol to oil ratio and the catalyst loading were systematically investigated. The optimal biodiesel conversion conditions were achieved as the following: 27wt% (alkaline loading in biochar), 585 °C (carbonization temperature), 7 (methanol to oil ratio) and 5.5 wt% (catalyst loading), with the biodiesel yield of 95%.
Preliminary screening of dominant epitopes of truncated p72 protein of African swine fever virus
Authors: Wang J L , Dong L , Meng W Q , Zhang C L , Chen J L , Jia J , Shen Z Q 
Published: February 2021

Abstract
African swine fever (ASF) causes huge economic losses in the absence of vaccines with protective efficacy. Diagnostic tools are critical for the early detection, prevention, and control of African swine fever virus (ASFV). The protein p72 is a good serological target for conducting ASF detection and surveillance. This study aimed to adopt a multiparameter analytic method to predict the dominant epitopes for p72 protein of ASFV based on a comprehensive analysis of the secondary structure, hydrophilicity, surface accessibility, and effects of the index of proteins using the software. The results showed that the area of the dominant epitope of protein p72 contained the N-terminal residues aa137–286. This study laid the foundation for developing vaccines and immunodiagnostic techniques.
Comparison of damage mechanism of polyimide films in space radiation environments
Authors: Shen Z C , Ding Y G , Wang Y Z , He H B 
Published: February 2021

Abstract
Thin polyimide (PI) film are widely used as structure material or functional material of spacecraft, but their microstructure and properties may be damaged by space radiation environments such as electron, proton, and ultraviolet and so on By using space combined radiation simulation facility and X ray photoelectron spectroscopy (XPS), the damage mechanism of PI film in different irradiation environments were studied. Both charged particles and ultraviolet photons cause the breakage and cross linking of molecular bonds of PI films. Among them, the charged particles mainly show that the PI film breaks the molecular valence bond, while the ultraviolet photon mainly shows the cross linking of the molecular valence bond. For charged particles, the breakage of PMDA molecular chain, especially the break of C = O double bond and -N (CO) bond is the main effect, and at the same time, C-O is generated. For UV irradiation, the breakage of C = O bond, C-O bond, C-N bond and C-C bond mainly occurred firstly, and then the cross-linking between ions of C, N, O with the benzene ring and between different benzene rings will appears with the UV irradiation.
Features of amplitude frequency characteristics of ABS plastic 3D printed metamaterial sample
Authors: Shirgina N V , Kokshayskiy A I , Volodarsky A B , Odina N I , Korobov A I 
Published: February 2021

Abstract
In this study, we investigated the acoustical properties of custom-designed phononic crystal-like acoustic metamaterials 3D printed from ABS plastic. The elastic properties of these metamaterials were studied experimentally and numerically. The metamaterial consisted of a set of plane parallel lattices the number of which could vary in different samples. Each lattice in the sample consisted of 16 parallel square rods. The amplitude-frequency characteristics (AFC) of the fabricated metamaterial sample were measured in the frequency range (35-100) kHz using longitudinal acoustic waves both in air and water. The propagation velocities of longitudinal and shear acoustic waves of ABS plastic itself were measured prior to the experiment. The band gaps (stop bands) were detected and investigated while measuring AFC of the metamaterials. We have found that the increase in the number of lattice layers in the sample led to the band gap acoustic wave attenuation coefficient increase along with the band gap narrowing, while the central frequency of the band gap remained the same. The numerical simulation of the sample frequency response was carried out in COMSOL. The results of experimental studies and numerical simulations were in satisfactory agreement. We have also investigated the ultrasound scattering diffraction pattern of the sample. The obtained results can be used in solid-state physics and material science, to create materials with controlled frequency-dependent acoustic properties.
Study on the allocation of congestion revenue under doubletrack pricing system
Authors: Zhang Maolin , Xing Yuhui , Wang Bangcan , Chen Qinggui , Liu Xiangrui , Mu Chunfeng , Li Wenxuan 
Published: February 2021

Abstract
The introduction of nodal spot market has brought unneglectable problem of congestion revenue allocation in China. Meanwhile, the coexistence of market and regulation in nowadays power market in China added specialty when it comes to appropriately allocate congestion revenue in China. Based on thorough review and analysis on both the principle of congestion revenue allocation as well as the status quo of a typical provincial market in China, this paper attempts to tackle this problem with consideration on property right, with which the contribution to the grid network of electricity users are taken into account. The solution is established in two stages, which is based on the reality that the distribution of two types of users in each node remains currently unknown.
Research on Mirror Coupling Process in Array Semiconductor Laser
Authors: Zhu Ma , Guodong Wu , Da Gong , Qiuyue Jiang , Xiang Sun 
Published: February 2021

Abstract
In order to improve the coupling efficiency of the array semiconductor laser and the multimode fiber, this paper establishes an ideal coupling model for the general structure of the array semiconductor laser. Combined with experiments and Zemax simulation, the relationship between the size error of the mirror package and the coupling efficiency is studied. The results show that : in the displacement error, the coupling efficiency is most sensitive to the X-axis displacement; in the angle error, the coupling efficiency is more sensitive to the Y-axis rotation angle than the Z-axis rotation angle error; the coupling efficiency curve has obvious peaks and is sensitive to changes, and the tolerance is small, which puts forward higher requirements on the stability of the coupling device.
Influence of coupling characteristics on commutation failure of new hybrid HVDC transmission system
Authors: Liu Jiaqi , Chen Zhengguang , Wang Xingguo 
Published: February 2021

Abstract
Hybrid cascaded multi-terminal DC transmission provides a more flexible transmission method, improves the voltage stability of the inverter AC system, and reduces the probability of commutation failure. The hybrid LCC-VSC at the receiving end of the DC system is a new type of topology.In order to study the influence of coupling characteristics between VSC and LCC on commutation failure in AC power grid at receiving end,firstly,a hybrid LCC-VSC simulation model is built on PSCAD to analyze the operation characteristics of the system during the fault and verify the reactive power support ability of VSC to LCC, and the improvement effect of VSC on LCC-HVDC under different reactive power control modes is compared and analyzed. In order to study the influence of AC/DC coupling on commutation failure of LCC, commutation failure immune factor (CFII) was introduced to study the influence of AC system strength on commutation failure of LCC. Finally, considering that the influence of AC/DC coupling on commutation failure is closely related to the degree of coupling, the electrical distance between LCC and VSC is further studied. The results show that the conclusion can provide theoretical guidance for the design and analysis of related projects.
A Comprehensive Method of Recovering Electricity Stealing Based on Data Mining
Authors: Tingchao Jin , Jianbo Wang , Shuya Cheng , Hui Cai , Yue Xie , Ying Wang 
Published: February 2021

Abstract
Aiming at the current situation that the current methods of recovering the stolen electricity often use manual analysis and estimation, which leads to unsatisfactory results, this paper proposes a comprehensive electricity recovery method based on data mining. First of all, it is determined for the stealing time and other relevant data. Then, for users who can calculate the correction coefficients, the correction coefficient method is used to analyze the electricity theft electricity, and the users who meet the requirements of the prediction algorithm are analyzed using the corresponding forecast algorithm time series or neural network. Finally, the remaining users use the calibrated capacity of the electric energy meter instead of the actual load to analyze the stolen electricity. Time series forecasting uses an improved ARIMA algorithm based on white noise to predict the stolen electricity. The neural network uses an improved BP neural network based on independent variables to predict the stolen electricity. The research results show that this method takes into account the characteristics of a single power-stealing user while taking into account the user’s periodicity. It can reasonably recover the electricity of power-stealing users and provides a new idea for power recovery.
Research on Coal Mine Risk Control Technology and Platform Base on Big Data
Authors: Jiang Jiachen , Miao Dejun 
Published: February 2021

Abstract
In order to improve the risk management and control ability, this paper studies coal mine risk management technology and big data platforms. First, BP neural network was optimized through data mining, and correction parameter technology. Based on this, a coal mine risk data prediction model was constructed. Then, combined with the control chart analysis, the coal mine risk early prevention method was proposed. At last, a big data platform to manage coal mine risk was developed. The results of this paper provide implementation methods and tools for coal mine risk management and control, and have reference significance for other enterprises.
Experimental study on the evolution of shock waves generated by high-pressure diesel spray
Authors: Li Yue , Liu Bingbing , Liu Gang 
Published: February 2021

Abstract
High fuel injection pressure leads to supersonic fuel jet and shock wave phenomenon. The characteristic of shock waves induced by supersonic jets under different working conditions were researched based on visualization experiments. The shock wave classification characteristics were studied. This paper indicates that the shock wave angle decreases with the increase of fuel injection pressure. And the shock wave angle increases with the time. The increase of ambient pressure will speed up the separation time of the spray and the shock wave. The classification of the shock wave is determined by the Mach number of the spray.
Electricity stealing time recognition method based on difference and K-means clustering
Authors: Yining Yang , Yang Xue , Hui Cai , Boliang Pan , Jianyu Chen , Jing Li , Qian Guo 
Published: February 2021

Abstract
The time of stealing electricity is an important element of stealing electricity. In order to solve the disadvantages of traditional manual determination of stealing time and make the verified stealing users pay electricity charges accurately, this paper proposes a new kind of method to determine the time of stealing electricity. In this method, the difference and clustering algorithms are combined through the electricity fluctuation rate. When the power fluctuation is small, the stealing time is determined through detecting an abnormal value with the difference distribution combined box diagram method; when the power fluctuation is large, the low power period of several consecutive days is found by clustering to determine the stealing time. The example demonstrates the high accuracy of this method and its value in practical applications.
Halomonas venusta Coupled Operation of Nitrogen Removal and Electricity Generation under High Salt
Authors: Wang Jinfeng , Liu Weifeng , Bo Le , Zhang Linghua 
Published: February 2021

Abstract
In this paper, the moderately halophilic bacterium Halomonas venusta DSM 4743T was selected to optimize the N removal conditions and the electricity generation conditions in the MFC, and conduct the coupled operation of the electricity generation and denitrification of MFC high-salt wastewater. The results showed when sodium succinate was used as carbon source, C/N was 5:1, pH was 9, and NaCl was 30 g/L, 93.22% N removal rate was obtained at 168 h. The maximum output voltage of MFC is 346 mV under the conditions of 6 g/L NaAc, 50 μm riboflavin, pH=8 and 30 g/L NaCl. H. venusta DSM 4743T MFC generates electric denitrification coupled operation, with the maximum output voltage up to 224 mV and the denitrification rate of 53.5%.
Nitrogen-modified Graphene Synthesis and Modification of H2S Removal Efficiency Comparison
Authors: Xue Hanling , Wu Yehao , Lei Chao , Yan Yuting , Wan Xuening , Guo Peiqi 
Published: February 2021

Abstract
In this paper, multilayer graphene is used as the raw material, graphene oxide is prepared by Hummers' improved method, and Nitrogen-modified Graphene is prepared by solvothermal method. It uses SEM, XRD, XPS, Ramman to characterize the sample morphology, internal composition, internal structure and element content, analyze its chaos and functional group change trend, and get: graphene to graphene oxide to Nitrogen-modified Graphene, graphene oxide The replacement of C atoms by O atoms increases surface wrinkles and increases defects and confusion. Nitrogen-modified Graphene is reduced due to the oxygen-containing functional groups of graphene oxide, reducing functional groups and reducing interlayer materials, resulting in a clean surface and reduced defects. The layer spacing is reduced. Then through a fixed bed reactor, using graphene, graphene oxide, and Nitrogen-modified Graphene as experimental samples, the adsorption of hydrogen sulfide gas was tested and researched: the original graphene and graphene oxide had similar adsorption capacities for hydrogen sulfide gas. Nitrogen-modified Graphene is about 3 times that of the first two experimental samples.
Effect of Atmosphere and Additive on Enrichment Characteristics of Trace Elements during Fluidized Bed Coal Combustion
Authors: Ma Zhirui , Liang Cai 
Published: February 2021

Abstract
The enrichment characteristics of trace elements (Cr, Mn, Co, Ni, Cd, Pb, Hg, As, Se) were investigated under air and O2/CO2 atmosphere during fluidized bed coal combustion. Results showed that Co, Ni, Cd, Pb, Hg, As, Se were more volatile than Cr and Mn. The increase of temperature promoted Mn, Co, Ni, Cd and Pb to migration from bottom ash to fly ash, and contributed Hg, As and Se to vapor phase. Cr, Mn, Co, Cd, Se tended to decrease in bottom ash and increase in fly ash during oxy combustion, while 21%O2/79%CO2 atmosphere led to the emission of gaseous As and the enrichment of Ni, Pb in both bottom ash and fly ash. With the increase in O2 concentration, the relative enrichment of all the trace elements except As increased, suggesting that their volatility were inhibited. Adding limestone and mixture of limestone and kaolinite had an inhibiting effect on volatilization of trace elements (especially Mn, Cd, Pb, Hg, As, Se) and the inhibiting behavior was strengthened under the oxy atmosphere.
The Preparation of Double Layers Low Pressure Carbon Nanotubes Membrane
Authors: Liu Weiyan , Xue Xiaolei , Wang Qingshan , Wang Yu , Guo Jin 
Published: February 2021

Abstract
Double layers low pressure carbon nanotubes (CNTs) membrane was prepared by pre-depositing CNTs on the Polyethersulfone (PES) flat membrane by pressure-assisted membrane filtration technology. Ethanol and Triton X-100 (TX-100) were used as dispersant to disperse two kinds of CNTs. By filtering two kind of CNTs dispersions in sequence, double layers CNTs were distributed on the surface of a PES membrane. With the proportion of the CNTs using TX-100 as dispersant increasing, the pure water flux of the double layers CNTs membrane will decrease. Normally, a membrane’s upper layer using ethanol as CNTs’ dispersant have higher pure water flux. Overall, almost all the double layers low pressure CNTs membrane realized the higher HA removal rate than single layer. By using CNTs with a diameter of 10-20 nm and length of 10-30 μm, the membrane with upper layer of 70% CNTs using ethanol as dispersant and 30% CNTs using TX-100 as dispersant can removal over 95% HA.
Short circuit current limiting method based on VSC-HVDC current limiting strategy
Authors: Huo Qidi , Lu Yingquan , Su Qingmei , Tang Xiaojun , Ma Shiying , Li Kewen , Zhang Huiyu 
Published: February 2021

Abstract
In this paper, a short-circuit current suppression method based on the adjustment of low-voltage current limiting strategy is proposed, which can suppress the output current of VSC-HVDC system during the fault by adjusting the low-voltage current limiting setting value of the VSC-HVDC control system, so as to achieve the purpose of suppressing the short-circuit current level in the converter station.
Incentive strategies for responders of electric vehicle virtual energy storage based on comprehensive contribution evaluation
Authors: Li Bei , Niu Meng , Wu Hongrui , Zou Mengjiao , Zhang Yue , Liu Dunnan , Shang Shanshan , Wang Lingxiang , Zhang Tingting , Liu Mingguang 
Published: February 2021

Abstract
The user-side demand resources of electric vehicles are integrated by load aggregators to respond to grid dispatch, which will bring many value-added benefits to the grid and other entities in the market. This article analyzes and constructs evaluation indicators from the two aspects of power contribution and response rate contribution to analyze the contribution of electric vehicle operators and electric vehicle users. The TOPSIS-grey correlation evaluation model is established and divided into four stages: state determination, reward and punishment analysis, peak-valley combination, and incentive distribution to analyze the comprehensive contribution of electric vehicle users.This is conducive to determining the amount of electricity and the response range of response speed when electric vehicles participate in the market to obtain rewards or punishments, and then distribute the compensation value and value-added benefits obtained when electric vehicle users participate in the regulation operation.
Decrease process analysis of urban system resilience based on the extreme flood simulation
Authors: Yabo Li , Peng Wang 
Published: February 2021

Abstract
Urban flood is growing worldwide due to climate change, rapid urbanization and population increase. Although the concept of resilience is an effective tool to deal with urban flood, urban flood resilience remains difficult to put into practice nowadays. The attenuation process of urban flood control capacity under the influence of flood is still a challenge. And the stage damage of flood resilience is strongly linked with the recovery of urban system to floods. But current studies failed to capture the change characteristic of flood resilience in time stage. Therefore, this study made stage damage analysis based on flood simulation and modelling in Jianye and Gulou District. Results reveal that Jianye has the higher inundated area and exposed population and asset to flood. Gulou shows more resilience to urban flood with flood return periods of 100 years. Moreover, the stage damage curve benefits the comprehensive understanding of loss and recovery process. This study provides a theoretical support for effective adaptive strategy to urban flood.