bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimization of the Synthesis Additive on the Basis of Amorphous Aluminosilicates
Authors: Zhegera K V
Published: April 2020

The article presents information on the possibility of applying additive based on amorphous silicates in the lime dry construction mixtures. The methods of synthesis additive on the basis of amorphous aluminosilicates are investigated. Using the method of mathematical planning of the experiment, the optimal mode of synthesis additive was chosen. The compressive strength of lime samples with an additive based on amorphous aluminosilicates obtained at different synthesis times and the ratio of the solid and liquid phases is calculated. The studies and calculations show the effectiveness of the use of amorphous aluminosilicates in lime composites as a structure-forming additive. The lime mixture with the use of amorphous aluminosilicates is characterized by good workability and a high value of compressive strength equal to 2.4 MPa.
Numerical Study of the Acoustic Efficiency of the Joint Operation of Sound-Absorbing Cells of Various Shapes
Authors: Pisarev P V
Published: April 2020

In the framework of the present work, numerical experiments were conducted to simulate an acoustic wave in a model channel with a group of various shapes resonators of the same volume. The mutual influence of closely spaced prismatic and biconical resonators in a rectangular model channel is revealed. It is proposed to consider the combination of various shapes resonators, which will allow, for one, to reduce the mutual influence of the resonators at their joint frequency, and also will increase the broadband band of the resonators group. Acoustically effective resonators combinations were revealed in the research.
Use of Mineral Flame Retardants to Reduce the Combustibility of Thermal Insulating Board Composites from Plant Waste
Authors: Ibragimov A M , Vachnina T N , Susoeva I V
Published: April 2020

Thermal insulation boards from unused spinning waste of linen and cotton fibers and soft wood waste have increased combustibility, like all composites with plant filler without mineral binders. To increase the fire protection of composites with plant filler, the use of flame retardants is necessary. The introduction of the composition of mineral combustion inhibitors - sodium carbonate or aluminum trihydrate allowed to reduce the combustibility of the material. The degree of damage by weight during combustion in the “ceramic box” of material samples from unused waste from the production of cotton and linen fibers and wood chips decreased by 1.3 … 3.2 times depending on the type and proportion of flame retardant additives and the type of plant filler.
Correction of Axial Force Distribution Function of Flexible Single Pile
Authors: Xiao Jie , Hu Ping
Published: April 2020

By introducing the stiffness ratio between the pile end soil and the pile side soil, the existing axial force distribution function is modified, and the axial force of the model pile is calculated by the modified distribution function. The calculated results are consistent with the experimental results, indicating that the modified axial force distribution function can more accurately reflect the axial force variation of the single pile.
Aging Simulation of Epoxy Resin Based on Molecular Dynamics Analysis
Authors: Zhang Xin , Duan Minghui , Li Jialong , Wen Qingfeng , Yao Chuang , Li Zhijian , Liang Haishen
Published: April 2020

Epoxy resin is the main insulation material for dry-type insulation equipment and is widely used in power systems. To explore the insulation aging process and detection method of insulation aging at the molecular level, molecular dynamics modelling and simulation of epoxy resin is needed. This paper studies the model construction method and model optimization processing method of epoxy resin, and based on this, a simulation study of epoxy resin aging based on molecular dynamics simulation is carried out.
Study on Separation and Purification the Secondary Metabolites of Oudemansiella Mucida
Authors: Xu Deng , Li Risheng , Deng Shupei
Published: April 2020

Oscillation culture was carried out on Oudemansiella mucida. The mycelia were extracted with ethyl acetate, separated by silica column chromatography and Sephadex LH-20 dextran gel chromatography. Though determination of chemical and chemical properties of chemical constituents, characterization by organic spectra (MS, 1H NMR, 13C NMR, and DEPT), and comparison with standard compounds, the three secondary metabolites from mycelia were finally identified to be ergosta-4, 6, 8(14), 22-tetraen-3-one; 5α, 8α-epidioxy-(22E, 24R)-ergosta-6, 22-dien-3β-ol, Hexahydropyrrolo [1, 2-α] pyrazine-1,4-dione.
A Survey of Time Series Data Visualization Research
Authors: Fang Yujie , Xu Hui , Jiang Jie
Published: April 2020

Time series data visualization integrates data analysis and mining, computer graphics, interaction design and other technologies and methods. This paper first analyzes the characteristics of time series data, including time and data attributes. Secondly, two kinds of visualization methods are summarized: one is the visualization method of time attribute, including spiral chart, calendar view, theme river view and dynamic view; the other is the visualization method of high dimensional time series data, which mainly summarizes four kinds of parallel coordinate methods. And the visual interaction design method is analyzed. Finally, the visualization of time series data is summarized and prospected.
Research on Optimization and Improvement of Power Grid Engineering Equipment Materials under Extreme Rain and Snow Conditions
Authors: Pan Peifeng , Qiu Jianbin
Published: April 2020

The construction of power grid engineering is developing more and more rapidly. In order to ensure the large-scale construction of power transmission and transformation projects, in the field of equipment and materials, it is necessary to eliminate the construction equipment of special equipment such as over-time service and equipment, and increase the amount of high-performance materials. The research and development of equipment materials should focus on specialization, standardization, and serialization to carry out innovative research and development, thereby improving grid construction efficiency, improving safety and quality levels, and completing power grid construction tasks. In recent years, with the rapid construction of UHV and other power transmission and transformation projects, the construction level and technical innovation capability of construction equipment have a great impact on the construction of the project, especially in the face of extreme rain and snow, how to ensure the strength of the material and meet the requirements. It is especially important.
Research Status of Recovery of Tellurium from Cadmium Telluride Photovoltaic Modules
Authors: Zhang Xiaofeng , Xu Wenjie , Wang Songli , Liu Dachun , Deng Pan , Deng Juhai , Jiang Wenlong
Published: April 2020

Cadmium telluride is a direct band gap semiconductor with high optical absorption coefficient and excellent photoelectric conversion efficiency. Therefore, the proportion of cadmium telluride thin film solar cells in photovoltaic emerging technologies is increasing. The shortage of metal tellurium is the main factor restricting the development of cadmium telluride thin film photovoltaic cell technology. Therefore, it is necessary to recover tellurium from decommissioned cadmium telluride photovoltaic modules. In this paper, the treatment status of cadmium telluride photovoltaic decommissioning components is studied, and the characteristics of various recycling methods are analyzed and compared. Based on recent research progress and important findings, the challenges and future prospects of commercialization are forecasted.
A Review of Processes and Technologies for the Recycling of Spent Lithium-ion Batteries
Authors: Wang Songli , Tian Yang , Zhang Xiaofeng , Yang Bin , Wang Fei , Xu Baoqiang , Liang Dong , Wang Lipeng
Published: April 2020

Lithium-ion batteries (LIBs) have been widely applied in the fields of portable electronic devices and energy conversion and storage, with which a lot of spentLIBs have been produced. LIBs contain many valuable metal elements. At the same time, heavy metal elements in spent LIBs and organic compounds in electrolytes will cause serious environmental pollution. Therefore, the research on reclamation and harmless treatment of lithium-ion batteries have important strategic significance. This paper introduces the research progress of recovery and treatment technology of LIBs in recent years. Main technologies include wet recovery process, pyrometallurgical recovery process and wet electrochemical recovery process.Secondary pollution and safety concerns during these processes were also discussed.
Advantages and Disadvantages of Ceramic Materials in Environmental Art
Authors: Fang Mengqi , Chen Haowu
Published: April 2020

It’s an inexorable outcome that modern ceramics is included in public environmental art, and this is also a new research direction which extends the expression scope of ceramic materials. The understanding of advantages and limitations existing in the involvement of modern ceramics into the realm of public art can give full play its advantages and mitigate its limitations in a scientific way.
Analysis of Droplets Spreading on Periodic Plasma Surface
Authors: Duan Yu
Published: April 2020

This paper presents the unique spreading process of droplet on dielectric barrier discharge (DBD) actuator periodic plasma surface. High-speed camera is used to capture the droplet spreading process. We use image processing to handle the massive droplets image data. Results show that droplets have more spreading time and much less oscillation cycles on periodic plasma surface, and the spreading diameter is larger while the apex height is lower. Furthermore, the effect of periodic plasma density is studied. And it is revealed that when plasma density increases in certain density range, the maximum and final spreading diameters increase, while the apex height of droplet in stabilization phase decreases.
Effect of Substrate Bias Voltage on the Structure and Properties of Mos2-Ti Composite Films on Titanium Alloy Surface
Authors: Li Qi , Xiong Min , Dai Mingjiang , Wei Chunbei , Liu Fengmei
Published: April 2020

In order to discuss the effect of negative bias on the structure and properties of MoS2-Ti composite films on titanium alloy surface. In this paper, MoS2-Ti solid lubrication films were deposited on titanium alloy surface by unbalanced magnetron sputter. The effects of negative bias on the structure and properties of MoS2-Ti solid lubrication films were discussed. The morphology, phase, hardness, friction and wear resistance and wear mark morphology of solid lubricating film were analyzed and tested by scanning electron microscope, XRD, microhardness tester, friction and wear tester and surface profilometer. The results shows that wwhen the negative bias voltage was -150V and -200V, the structure of MoS2-Ti films is compact and the bonding with the substrate is compact. With the increase of negative bias voltage, the hardness of the film increases gradually. The wear rate of the films prepared at -150V bias voltage is the lowest, which is 2.2×10−17mm3/(N×m). The MoS2-Ti composite films deposited on the surface of titanium alloy exhibit excellent tribological properties with low friction and wear resistance, which effectively improves the surface friction and wear properties of titanium alloy.
Research Progress in Effect of Metal Surface Nanocrystallization on Fatigue Property
Authors: Shi Zongcai
Published: April 2020

Nano grains have unique structure and properties. Surface self nano technology can introduce nano structure into the surface of materials. By changing the surface structure and microstructure of metal materials, the comprehensive properties of metal materials are improved. Moreover, the surface properties of metal materials are affected by the nano grain layer, work hardening and residual compressive stress. It has unique advantages in improving fatigue performance by inhibiting the initiation and propagation of fatigue cracks. In this paper, the research progress of surface self nano technology and the change of microstructure and mechanical properties caused by it are introduced. Finally, the research progress of its influence on the fatigue properties of metal materials is emphatically reported.
Effect of Annealing Temperature on Properties of Co-Sputtered Bi2Te3
Authors: Liu Yang
Published: April 2020

Bi2Te3 thin film samples are prepared by magnetron co sputtering. The samples are annealed in a nitrogen atmosphere and were treated at different temperature for 2 h. Effects of annealing temperature on the structure and thermoelectric properties of Bi2Te3 are studied in detail. As the annealing temperature increases, the Te element on the surface begins to volatilize, and some Te elements precipitate and crystallize on the surface, resulting in a decrease in the Te element in the Bi2Te3 thin film. When the annealing temperature is 350 ° C, the power factor of Bi2Te3 film reaches a maximum of 0.21×10−3 Wm−1K−2.
The Study on Thermal Analysis Method of PCB
Authors: Yang Fan , He Chen , Xu Qian , Xiao Hua
Published: April 2020

This essay makes the reliable analysis and modelling on printed circuit boards(PCB) by software of Flotherm and get conclusions of three points through simulation analysis:1) there is an important impact on heat transfer of the distribution of copper foil on PCB, and the actual condition should be selected for different precision simulation modules; 2) the heating device with simple structure and small thermal resistance can be dealt with as the simple square; 3) in the case of knowing the internal thermal resistance, integrated chip adopts double thermal resistance model as much as possible. In accordance with above inference, Flotherm modelling and simulation is carried out for certain printing circuit board, and computing results are compared with actual testing data to verify the correction of analysis methods.
Study on Thermal Decomposition Behavior of Tea Saponin from Camellia Oleifera Cake
Authors: Tan Dengfeng , Pang Jinying , Hu Hualin , Sun Chao
Published: April 2020

Different contents of tea saponin (CZS-1 and CZS-2) from Camellia oleifera Cake were prepared via ethanol extraction method, and thermal degradation temperature and thermal degradation kinetics of the CZS-1 and CZS-2 were studied by thermogravimetric analyzer method. The results indicate that the thermal degradation of CZS-2 involves three steps, the thermal degradation of CZS-1 involve four steps. The thermal decomposing temperature <430°C, thermal stability of CZS-2 was worse; while the thermal decomposing temperature >430°C, the relationship was just opposite. With the heating rate increasing, thermal decomposing temperature of CZS-1 and CZS-2 were increased gradually. The thermal degradation kinetics of CZS-1 and CZS-2 were studied by Kissinger’s method. It was found that thermal degradation activation energy of CZS-1 and CZS-2 were 43.6 kJ/mol and 30.7 kJ/mol at the first and second steps, respectively.
3D Printing Method of Spatial Curved Surface by Continuous Natural Fiber Reinforced Composite
Authors: Zhang Haiguang , Liu Di , Huang Tinglong , Hu Qingxi , Lammer Herfried
Published: April 2020

A method for printing continuous flax fiber-reinforced plastic (CFFRP) composites parts by five-axis three-dimensional (3D) printer based on fused deposition modelling (FDM) technology has been developed. FDM printed parts usually need supporting structures, have stair step effect, and unfavorable mechanical properties. In order to address these deficiencies, continuous natural fiber prepreg filaments were first manufactured, followed by curved path planning for the model for generating the G-code, and finally printed by five-axis 3D printer. The surface quality of printed parts had been greatly improved. The compressive strength and modulus of the 3D-printed CFFRP specimens increased by 29% and 522% respectively, compared with planar slicing method.
Research on a Logistics Conveying Device for Hydrostatic Testing of Gas Cylinders
Authors: Zhou Yu , Huang Song , Zhao Zhongguo , Xiong Shutao , Li Bin
Published: April 2020

Our regular inspection during the use of cylinders is an important means to ensure the safe use of cylinders, and reasonable periodic inspection efficiency is a necessary means to ensure the normal circulation of cylinders and maintain the stability of the cylinder industry. As a bottleneck in the testing process of the hydrostatic test, the efficiency of periodic inspection of gas cylinders has been affected for a long time. In order to solve the above problems, this thesis mainly researches and solves the bottleneck problems that affect the efficiency of hydraulic pressure tests, in order to achieve rapid detection of the hydraulic pressure tests of cylinders, and develops a kind of gas cylinders to dial, rotate, flip, water, hoist, weigh It can accurately and accurately locate the water jacket, pour water, purge, and dry the cylinder logistics conveying device, and realize the fast and accurate cylinder hydraulic pressure test, eliminating the bottleneck problem in the detection process and achieving the effect of rapid cylinder detection.
Preparation and Research of Solvent-Free Epoxy Coating for Drinking Water Tank
Authors: Cui Cancan , Shi Jiafeng , Kang Shaowei , Han Zhongzhi , Zhang Jing , Sun Zhaoxing , Duan Shaoming , Liu Benhua , Guo Xiaojun
Published: April 2020

By compounding E42 and E51 epoxy resin, blending modified polyamide curing agent and modified fatty amine curing agent, optimizing glycidyl ether reactive diluent system, using safe non-toxic pigment filler and grading wear resistance filling and optimization auxiliaries system, the developed coating sanitary index meets the requirements of “Sanitary Standard for Drinking Water”, and the wear resistance (cs17, 1000g/1000r, mg) is 64.4mg. The coatings passed 6J impact resistance test and is resistant to bending 1.5° without cracks. The coatings also have excellent resistance to medium corrosion and salt spray.
A Review of Research on Point Cloud Registration Methods
Authors: Gu Xuejing , Wang Xu , Guo Yucheng
Published: April 2020

The point cloud Registration Method is the Basis for 3D reconstruction and scenes perception. After decades of development, it has been acquired in the fields of reverse engineering, machine vision, CAD/CAM,laser remote sensing,virtual reality, human-computer interaction,and stereo imaging.A wide range of applications.in this paper, the existing registration methods are divided into two types based on the registration process: coarse registration and fine registration.the algorithm principles and processes,and combs the related derivative algorithms. On this basis, the characteristics of various algorithms are compared and analyzed, which provides a reference for selecting suitable algorithms in different scenarios.Finally pointed out the main provides a reference for electing suitable algorithms in different scenarios. Finally pointed out the main problems and future research directions.
Application Research of Vision Sensor in Material Sorting Automation Control System
Authors: Li Jingyu
Published: April 2020

Based on the PLC in the material sorting automation system, the paper builds an automatic material sorting system based on visual sensors. The control system involves various sensor technologies such as photoelectric sensors and vision sensors, mechanical technology, electrical and electronic technology, frequency converter technology, motor drive technology, air pressure control technology, human-machine interface technology, etc., and integrates the application of various technologies in training. On the platform, students can familiarize themselves with the process of detecting, transmitting, and processing the automatic production line and the control process of the system through the practice of this training platform. They can be familiar with the mechatronics technology. The system first detects the metal through the inductive sensor, detects the colour through the photoelectric sensor, and finally detects whether the processing is qualified by the machine vision system, and obtains the target data, and finally controls the robot to realize the sorting action, and completes the storage operation of the stereo warehouse.
Group-attention Based Neural Machine Translation
Authors: Hu Renyu , Xu Hao , Xiao Yang , Wu Chenjun , Jia Haiyang
Published: April 2020

Machine translation is a classic problem in natural language process (NLP). Recent years, the encoder and decoder through an attention mechanism has become a trend. Google proposed a new simple network architecture, the Transformer using attention mechanisms only rather than CNN or RNN in 2017. However, it may lose some important information (e.g., grammatical component, etc) when using attention mechanism for whole sentence.We propose a new brand model based on transformer using Group attention layers and group position embedding. It absorbs the features of Group-CNN combines the algorithm in computer vision (CV) and NLP. The model not only pays more attention to the ingredients (e.g., subject, predicate and adverbial, etc), but also enhances the connection of phrase. It outperforms SofA Transformer in using more syntactic information.
Study on Screw-holding Ability of Three Screw Connections in Medium Density Fiberboard Components
Authors: He Yiwan , Chen Sisi , Chen Ming
Published: April 2020

In this experiment, medium density fiberboard (MDF) was chosen as connection parts and orthogonal test method was used to study the influence of screw type, diameter of guide hole and screw penetration depth on screw-holding ability in MDF components. The results showed that the type of screw has no significant effect on the screw-holding ability, while the self-tapping screw with cross groove has the greatest effect, the diameter of the guide hole and the depth of the screw have significant effects on the strength of the screw-holding ability. Within a reasonable range, the larger the diameter of the guide hole and the deeper the screw penetration MDF has, the higher the anti-pulling force the screw get. In actual production, the strength of screw joint can be improved by increasing the diameter of guide hole and deepening the depth of screw properly.
Microscopic analysis of polyimide nanocomposites aging mechanism exposed to partial discharges under high frequency voltage stress
Authors: Asif Muhammad , Li Qingmin , Huang Xuwei , Ren Hanwen , Zian Ding , Liu Tao
Published: April 2020

For the sake of investigating the influence of nanoparticles on the reduction in structural damage of neat polyimide (PI) and PI nanocomposites, scanning electron microscope (SEM) based microscopic study was conducted on unaged and aged pure PI and PI/TiO2 nanocomposite samples exposed to partial discharge activity under high frequency ac voltage stress. PI/TiO2 nanocomposites with 2, 3 and 5 wt.% were fabricated adopting in-situ polymerization technique. Partial discharge (PD) aging measurements were made and PD characteristic parameters were obtained to analyze the electrical performance of both neat PI and PI nanocomposites. Based on microscopic structural analysis, it was found that PI nanocomposite sample experienced less structural damage in contrast with neat PI. Smaller and lesser number of voids were found in PI/TiO2 nanocomposites than that of neat PI in result of PDs reduction in PI nanocomposite.
Study on the Free Vibration of a Rubber Band Oscillator
Authors: Huang Yan , He Songlin , Yu An , Ren Jie
Published: April 2020

Through theoretical analysis and experimental verification of the motion of a rubber band oscillator, this paper proves that the new model for describing the mechanical properties of rubber is effective. It is pointed out that there are both elasticforce related to deformation and viscoelastic force related to deformation process in rubber. Within a certain range of deformation, elastic force satisfies Hooke’s theorem, and viscoelastic force is proportional to fractional derivative of elongation with time. The mechanical properties of rubber materials can be described by static elastic modulus (elastic coefficient), viscoelastic degree and viscoelastic coefficient.
Research on the optimization design method of the stiffness of the composite sandwich panel
Authors: Fu Xiao , Mei Zhi Yuan , Chen Guo Tao , Zhang Er
Published: April 2020

Based on the optimization design of sonar fairing shell plate, aiming at the contradiction between sound transmission and stiffness design of composite shell plate, a scheme of carbon fiber-reinforced buoyancy core sandwich shell plate is proposed. The sound transmission performance and stiffness characteristics of shell plate are studied respectively. Through theoretical analysis and finite element simulation, the stiffness change law of sandwich plate meeting the sound transmission performance is discussed, and the sound transmission clamp is obtained The stiffness optimization design method of laminates is presented, and the accuracy of the method is verified by an example.
The Role of Pad Block’s Support Surface Topography in the Measurement of Optical Glass BK7’s Surface Figure
Authors: Ren Lele , Zhang Feihu , Liao Defeng , Liu Ang , Wang Yiren , Wang Jian
Published: April 2020

Large flat transmission mirrors made from optical glass BK7 are widely used in the high-power laser facility, which are required of stringent specifications for the whole spatial frequency errors. This work reveals the role of pad block’s support surface (PBSS) topography in measuring BK7 surface figure. Firstly, the PBSS topography was measured with laser displacement sensor. Secondly, the BK7 surface deformation at different pad blocks were simulated with finite element method and validated by experiments. Finally, a method was proposed to quantitively evaluate the different PBSS topography.
A Review of SiC Wafers In-Line Detection Method in Power Device Fabrication
Authors: Li Ling , Li Jialin , Wu Hao , Liu Rui , Zhang Hongdan , Tian Liang , Zhu Tao , Jiao Qianqian , Jiang Chunyan , Wu Junmin , Pan Yan
Published: April 2020

Silicon carbide (SiC) has outstanding advantages such as wide band gap, high electron saturation drift speed, high thermal conductivity, high voltage and high temperature resistance. It is particularly suitable for making high-power devices. The in-line detection of wafers in the manufacturing process of SiC devices can reflect the quality of incoming materials and process quality. It is a very important part of the manufacturing process. SiC wafer’s in-line inspections involves characterization of the epilayer thickness, surface defects and contamination, wafer warping, dielectric and metal film thickness, etching morphology, etc. Various test methods are compared and discussed in this paper and suggestions are given on detection method selection.
Design of a New Structure for Rotary Viscometer
Authors: Jiang Tao , Li Junshi , Zhang Shengjun
Published: April 2020

The existing rotary viscometers on the market mostly adopt the single-blade transmission structure, which cannot eliminate the end-effect of the fluid viscosity test and affect the test accuracy. In order to solve this problem, a new structure of rotary viscometer is designed. The blade of the rotary viscometer is divided into upper and lower parts, and the parallel transmission scheme is adopted to prevent the upper blade from being subjected to additional torque, thereby eliminating the end-effect.
RETRACTED: Microstructure Observation and Mechanism Analysis of High Carbon Steel Decarburization at High Temperature under Electric Field
Authors: Chen Long , Tang Lingbo , Xu Jiawei
Published: April 2020

Electric Field Heat treatment has a significant effect on the superplasticity, recrystallization and phase transformation of metals, and can also improve the superplasticity and mechanical properties of materials. The effect of electric field on high temperature decarburization of high carbon steel was studied by comparing the decarburization degree of high carbon steel under electric field and non-electric field. The mechanism of the electric field is analyzed. The Electric Field promotes the migration of vacancy or vacancy + solute atoms to the grain boundary, dislocation or sample surface to realize the diffusion process.
Passively Q-Switched Tm: YAP Laser with a WSe2 Saturable Absorber
Authors: Li Guoxing , Yang Xining , Li Linjun , Zhang Hongda , Zhang Ziqiu , Zhang Liang
Published: April 2020

In this paper, WSe2 nanosheets were prepared and demonstrated to have non-linear absorption characteristics that were saturated at about 2 μm. A passively Q-swithched (PQS) Tm:YAP laser was perfectly implemented with the Wse2 nanosheets as a saturable absorber (SA). In PQS mode, an average output power of 1.01 W with a pulse duration of 1.7 μs at 166.7 kHz was achieved with a pump power of 12.1 W, corresponding to an optical-optical conversion efficiency of 8.3%. A peak power of 3.88 W was acquired from a PQS Tm: YAP laser.
Anti-Hepatoma Activity of A New Selenium-Rich Chitosan from 6-Hydroxy Esterification of Chitosan Copper
Authors: Zhu XiuLian , Shen Liuying , Chen Qinhua , Wang Hongmei , Zeng Xiaohua
Published: April 2020

This paper presents a technique to produce a selenium-rich chitosan by 6-hydroxy esterification of chitosan copper whose mole ratio of chitosan monomer and Cu is almost 1:1, which is suitable for the fields of food and feed chemistry or fine chemical technology, and belongs to the field of biomedical engineering technology. 6-Selenite chitosan copper will have better application prospect in medicine and make as selenium nutrient supplement in food, feed and agricultural fields, due to its higher selenium content and lower dosage than existing seleno-chitosan. The selenite chitosan copper effect than the common selenate chitosan. Selenite chitosan copper, which contains 10 times more selenium then existing seleno-chitosan or selenate chitosan, can greatly reduce its use and have a better anti-hepatoma effect. Metal ion protected amino group can bind to acid in the process of biological metabolism, and has a good targeting effect on the weak acidic environment of hepatocellular carcinoma tumors. Previous experiments in vitro showed that the IC50 value of selenite chitosan copper inhibiting HepG2 cells was 20.3 mg/L, and the inhibition rate to HepG2 cells was 87% at the concentration of 50 mg/L.
Preparation and Research of Nano Water - Based Ultra - Thin Fire Retardant Coatings for Steel Structure
Authors: Gao Shijie , Liu Jianyong , Wu Xin , Wu Yulong
Published: April 2020

The effects of nanometre materials on fire retardant coatings for steel structure were prepared and studied. The results showed that there were many bubbles in the Nano coating, and the carbon layer was more complete and compact. At the same time, the heat release rate, total heat release and smoke production rate of Nano coatings are all lower than traditional coatings. According to XPS energy spectrum analysis of the Nano coating, the content of O element in the black region is lower, and the content of P element is higher than that in the white region, indicating that the combustion in the black region is not complete and the flame retardant effect is batter.
Calculation Method of Take-off Weight for Single-seat Ultralight General Aircraft
Authors: Zhang Junyao , Tong Gang , Wang Feng , Zhou Quoqing
Published: April 2020

With the reform of low-altitude airspace, there will be a lot of room for development of ultralight general aircraft. However, it is difficult to accurately calculate weight of single-seat ultralight general aircraft in the past. This paper deduces a method for quickly calculating the takeoff weight in the general aircraft concept design stage, and combines the design data of some typical single-seat ultralight general aircraft to modify the coefficient of the formula. Thus the aircraft takeoff weight calculation formula can more accurately estimate the maximum takeoff weight of a single-seat ultralight aircraft. Taking a single-seat aircraft as an example, the effectiveness of the method is tested, and the error of the take-off weight calculation before and after the parameter correction are compared and analyzed. The calculation method and results have certain reference value.
Exploration and Application of Software Development Automation Technology
Authors: Lin Long , Yang He , Wang Yue , Shi Cuncun
Published: April 2020

Application development often faces problems such as demand changes, long cycle, and low efficiency. This paper attempts to solve such problems with automated generation technology. The article abstracts the design and development process of a typical application system; analyzes the key issues; then, after designing the overall architecture of the builder, it describes the design of interface presentation layer, control layer (business logic layer) and data model layer; finally this paper describes the challenges encountered by the builder and improvements in practice.
Multimodal Physiological Signal Emotion Recognition Based on Convolutional Recurrent Neural Network
Authors: Liao Jinxiang , Zhong Qinghua , Zhu Yongsheng , Cai Dongli
Published: April 2020

In order to solve the problem that the emotion recognition rate of single-mode physiological signals is not high in the physiological signals based emotion recognition, in this paper, we propose a convolutional recurrent neural network based method for multi-modal physiological signal emotion recognition task. The method used convolutional neural network to learn the spatial representations of multi-channel EEG signals and the Long Short-term Memory network to learn the temporal representations of peripheral physiological signals (EOG, EMG, GSR, RSP, BVP, and TMP). The two representations are combined for emotion recognition and classification. In the two emotion dimensions of Arousal and Valence, our experiments conducted on the open source dataset DEAP shows that, this method achieve 89.68% and 89.19% average accuracy in the EEG emotion classification, 63.06% and 62.41% average accuracy in the peripheral physiological signal emotion classification, 93.06% and 91.95% average accuracy in the combined feature emotion classification. The experimental results show that the convolutional recurrent neural network based method that we proposed efficiently extract multi-modal physiological signal feature to improve the emotion recognition performance.
The prediction of building heating and ventilation energy consumption base on Adaboost-bp algorithm
Authors: Sun Lunan , Wei Qi , He Lipeng , Yin Zihe
Published: April 2020

Particularly In the nowadays, under the environment of increasing severe weather, buildings become consumers of energy resources that cannot be ignored, the hvac is one of the most important energy consuming equipment in the building, it has great practical significance and practical guidance for energy consumption prediction and optimization to reduce overall energy consumption and cost. The Adaboost-BP model based on integrated learning algorithm can not only improve the prediction accuracy of BP neural network algorithm model, at the same time, the defects of BP neural network algorithm such as falling into local minimum and slow convergence speed can be corrected. Moreover, the integrated learning algorithm has low requirements for weak classifiers and almost no need to adjust its parameters, so it has a wide range of use and good robustness. The building cannot be ignored as energy resource consumers, and hvac, as one of the main energy consumption equipment in buildings, prediction and energy consumption in the energy saving optimization to reduce the overall energy consumption, reduce costs. The Adaboost-BP model based on integrated learning algorithm can not only improve the prediction accuracy of BP neural network algorithm, but also correct the defects of BP neural network algorithm such as falling into local minimum value and slow convergence speed. Moreover, the integrated learning algorithm has very low requirements for weak classifiers and almost no need to adjust its parameters, so it has a wide range of use and good robustness .In conclusion, the energy consumption forecasting and optimization scheduling based on data-driven have good effect to optimize the energy consumption structure of office buildings, save energy resources, reduce greenhouse gas emissions, and reduce the impact on the power grid caused by the increase of demand from users during the peak period of electricity consumption, also provides a design idea for distributed energy network design.
Design of the Electric Control System for the Cleaning Equipment of Pigsties
Authors: Shao Jinfa , Shi Juncheng , Tao Jie
Published: April 2020

According to the control requirements of cleaning equipment, this paper designs corresponding electrical control system the design detection system is designed to realize horizontal and vertical positioning of cleaning mechanism with electromagnetic proximity switches. The control circuit is designed with a VB1 model PLC as main controller, the system control flow is analyzed to switch the steps of entering a pigsty, collecting pig manure, and returning and dumping pig manure.
Analysis on the schemes of 330kV Power Transformer Long Time Induced Voltage field Test based on GB/T1094.3 release version
Authors: Bao Yanyan , Zhang Guangdong , Yang Junting , Liu Kang , Wen Dingjun
Published: April 2020

The principles of 330kV power transformer long time induced voltage field test are introduced in the paper, the varieties of key elements on the test are analysed on GB/T1094.3 release version, some suggestions about test and schemes are suggested finally.
Fuzzy-based Sliding Mode Control of Chaotic Oscillation in Power System
Authors: Gao Wen , Xiao Haifeng , Ma Zhao , Qiao Shejuan
Published: April 2020

Power system will occur chaotic oscillation when it is exist periodic load disturbances. As for it, the simplified mathematical model of interconnected two- machine second-order power system is established based on the modelling and analysis of nonlinear system theory, and the dynamic behaviour of chaotic oscillation in power system is analysed. According to the sliding mode control and fuzzy control theory, the fuzzy-based sliding mode control is proposed, it is also analysed and proved theoretically. Simulations results show that the proposed method can suppress the chaotic oscillation in power system effectively. It not only reduce the convergence time, but also reduced the chattering of the system, and has strong robustness.
Basic research on reflection characteristics of coupled artificial electromagnetic structures
Authors: Zhao Shujian
Published: April 2020

This paper presents a composite artificial electromagnetic structure that couples aplasma photonic crystal(PPC) with frequency selective surface (FSS). Plasma photonic crystals, as an artificial electromagnetic structure, have the effects of photon band gap and photon locality, but their cut-off frequency is affected by their characteristic scale, so we couple another artificial electromagnetic structure FSS, and expect it to have better electromagnetic properties and tuning capabilities. The S- parameters of this coupled artificial electromagnetic structure in the 6-18GHz frequency band were simulated and measured in a microwave darkroom, which proved that the structure has excellent electromagnetic characteristics.
The basic study of the relation between the safe areas and fan position by using the Particle Image Velocimetry
Authors: Hong Liu
Published: April 2020

Nowadays, the safety of large areas has become the focus of attention. The gas leak will easily cause the terrible losses of lives and property if the appropriate measures are not taken immediately. Therefore, once the similar situation happens, the toxic gas must be dealt with timely to adjust the safe areas of the large space and ensure the necessary security of people. On the basis of the background, this paper introduces a method to study the relationship between the safe areas and the fan position by using the PIV (Particle Image Velocimetry).
Intelligent Food Cold Chain System Design
Authors: Zhang Yinuo , Hua Guowei
Published: April 2020

This paper proposes a design scheme of intelligent food cold chain system. Firstly, the functional structure of the system is defined based on the requirement of different subjects participating in the system. Then the system is designed from the technical perspective by introducing intelligent logistics support technology. Different from the existing food cold chain system, the system proposed in this paper is relatively macro, not specific to food categories; and it focuses on the whole process of the cold chain, instead of only considering some parts.
Research on Optimization of Robustness for Cascading Failure in Power Grid
Authors: Liang Mingyue , Zou Yanli
Published: April 2020

When considering the cascading failures or the robust performance of the power network, most of the researches in network science are based on the topology of the power network. However, according to some researches, only using the topology of the power network can not reasonably evaluate the robustness of the power network.Therefore, when considering the cascading failures in the power network, we must combine the electrical characteristics with the network topology to make a better evaluation. From the perspective of network science, the related research on cascading failures has made a lot of progress. In order to optimize the robustness of power network, the optimal topology of power network is designed under the cascading failure model combined with real electrical characteristics.
Research on Construction of Financial Information System of Energy Enterprise Based on Green Environment
Authors: Wang Xiujun , Wang Chuang , Fu Yijie
Published: April 2020

With the increasing globalization and the rapid growth of China’s economy, the scale of environmental energy companies has continued to expand, and social requirements for financial management of environmental energy companies have become more stringent. In order to improve the efficiency and quality of financial management of energy-source enterprises, so as to ensure that the financial management of energy companies is in a normal operating state, thereby saving more costs for environmental-energy companies, it is necessary to analyse the current stage on the basis of reviewing the concept of informatization The potential problems of financial management of Chinese energy companies have been explored in depth by putting forward specific innovative measures. Therefore, the construction of a new type of financial information system for green environmental energy companies has emerged. The construction of this information system is beneficial to environmental energy companies. More efficient and clean development of large enterprises, and further improvement of financial information systems.
CNN Based Electromagnetic Side Channel Attacks on SoC
Authors: Xiao Yong , Xin Jin , Shen Yanhua
Published: April 2020

Side channel attacks are well-known thread to ciphers in real world. In this paper, we give a CNN based profiled side channel attacks on AES cipher implemented on HI Silicon Kirin 620 SoC, which is a 1.2GHz multi-core platform. With 100,000 acquired side channel traces to train, the CNN have ability to recover real key byte under 1,000 traces, even though the traces are misaligned.
Action Permissibility Prediction in Autonomous Driving through Deep Reinforcement Learning
Authors: Wang Jiaoyang , Sun Qian , Yao Degui , Xiong Feng
Published: April 2020

This paper proposes a new nature based on deep deterministic policy gradient for deep reinforcement learning in continuous state and action space, which can greatly accelerate the emergence of artificial intelligence training and solving problem: state-action permissibility. The proposed method is integrated into the latest DDPG algorithm to guide its training and is applied to solve the lane keeping (steering control) problem in autonomous driving or automatic driving. Finally, the TORCS which is the open racing car simulator simulation software builds various simulation environments, including different tracks to verify the effectiveness of the algorithm. The results show that the proposed method can significantly speed up the algorithm training speed of the lane keeping task.
Research on Control Method of Multi-terminal Flexible DC Transmission System Based on Voltage Droop Control
Authors: Hu Yang , Dai Yong , Wu Junxing , Xiao Qunying
Published: April 2020

Flexible DC transmission system has the advantages of small line loss, high reliability and strong controllability, and can reduce the frequency of system inactivity. In this paper, the voltage droop control method of flexible DC transmission system is studied in detail. Firstly, the principle and characteristics of the series structure, parallel structure and hybrid structure of multi-terminal flexible DC transmission system are introduced in detail. Based on this, the principle and characteristics of the control strategy of DC voltage droop control of the system are analyzed, and an improved voltage droop control strategy is proposed. Finally, a three-terminal flexible DC transmission system model is built on the Matlab/Simulink platform. The simulation results show that the control strategy plays a certain role in stabilizing DC, AC voltage, AC current and power balance control.
Research on the Three- phase Cascaded Dual-buck Grid-connected Inverter
Authors: Zhao Mingyang
Published: April 2020

The inhibition of common-mode leakage current is the key problem to be solved in cascaded photovoltaic grid-connected inverter. To eliminate the common-mode leakage current of cascaded dual-buck grid-connected inverter, a three-phase cascade double-buck photovoltaic grid-connected inverter (TPCDBGCI) topology is proposed in this paper. Meanwhile, a new phase-shifting carrier SPWM (PSCSWPM) control strategy that can make the single phase common-mode voltage and three phase differential-mode voltage constant in the half cycle is presented. Then, the simplified model and operating modes of TPCDBGCI are analyzed, which show that common-mode leakage current of TPCDBGCI is effectively suppressed. Finally, the experimental results verified the correctness of TPCDBGCI.
Application of 3D Digital Technology in the substation design
Authors: Gao Yang
Published: April 2020

During the operation of a substation, the requirements for the engineering design are very strict, requiring the cooperation of multiple professions, and the demand for engineering digitalization is also increasing. The three-dimensional digital technology is to effectively solve the problems encountered in the substation operation in the form of data representation and data storage, and provides reliable technical support and efficient concepts of technology for substation operation. This time, the main analysis of the specific application of 3D digital technology in the substation design, and combined with the actual situation of China’s current substation, the development prospects of 3D digital design are analyzed and prospected.
Algorithmic and Simulated Based Transmission Ratio Optimization of A Two-Speed Electric Vehicle For Car-sharing
Authors: Ma Jun , Wu Lei , Gong Zaiyan , Cao Yun
Published: April 2020

This paper proposes an approach to optimize the fuel economy of a two-speed electric vehicle (EV) in car sharing business through Genetic Algorithm and ADVISOR co-simulation. The ADVISOR simulation model built including dynamics, fuel cell, storage battery and motor. Under NEDC working condition, the two-speed gearboxmodeled, modeled and the optimal combination of transmission ration and main reduction ratio is found by genetic algorithm to improve fuel economy.