bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Influencing Factors of Fire Resistance of Curtain Wall in High-rise Buildings
Authors: Bai Bin , Liu Zengtao , Lu Lei , Zhang Baofang
Published: June 2020

With the continuous improvement of China’s economic development level, the construction industry has developed significantly, and as urban high-rise buildings have become the mainstream of today’s building forms. In high-rise buildings, the most important safety issue is fire prevention. The application of fire-resistant glass in the curtain wall of high-rise buildings has become the focus of attention. Fire-resistant glass can play a role in controlling fire, smoke and high temperature diffusion for a long time when a fire occurs. As well as the requirements for design materials, this article discusses the precautions for the design of curtain walls of high-rise buildings and the promotion and use of fire-resistant glass in China.
Subcellular Localization of BoaZDS Gene in Chinese kale
Authors: Yuan Qiao , Huang Wenli , Jian Yue , Zheng Hao , Jiang Min , Chang Jiaqi , Zhang Fen , Sun Bo
Published: June 2020

The experiment used the ‘Sijicutiao’ mustard sterile seedlings as the material, firstly constructed the BoaZDS subcellular localization vector with the cloned BoaZDS gene, and extracted the plasmid, then separated the Chinese kale leaf protoplast by enzymatic hydrolysis. After purification, the BoaZDS gene was transiently transformed, and then the position of the BoaZDS gene was observed under a fluorescence microscope. The results showed that the BoaZDS gene was localized in the chloroplast, which was consistent with the predicted results of bioinformatics software. The results provide a basis for studying the function of the ZDS gene in Chinese kale.
Sequence Analysis of BocAOP2.3 Gene in Cabbage
Authors: Yuan Qiao , Huang Wenli , Jian Yue , Zheng Hao , Jiang Min , Zhang Fen , Sun Bo
Published: June 2020

The AOP2.3 gene is an important gene affecting the side chain modification of aliphatic glucosinolate. Here, the Brassica oleracea var. capitata AOP2.3 (BocAOP2.3) gene sequence was obtained from the Brassica database (BRAD) and subjected to sequence analysis. It is indicated that the BocAOP2.3 gene contains a 936 bp open reading frame (ORF) encoding a protein of 311 amino acids with a calculated molecular weight of 33.62 kD, the isoelectric point (pI) is 4.46. The highest number of amino acids is Valine (Val), whereas the lowest number is Tryptophan (Trp). Its prediction formula is C1455H2295N397O505S6. Its total hydrophobicity index is -0.5, the solution instability index is 29.25, and the fat solubility index is 77.46. Sequence alignment indicated that the BocAOP2.3 protein is more closely related to Brassica napus and Brassica Rapa, those all belonged to the Cruciferous genus. The results of this study provide a molecular basis for elucidating the function of BocAOP2.3 gene in cabbage.
Preparation of nano-Al powder with wire electric explosion
Authors: Liu Ying , Zhang Hao , Li Hong , Li Hongyang
Published: June 2020

Nano-Al powder was prepared by wire electric explosion of different diameter aluminium wires. The results show that nano-Al powder particles appear spherical and agglomerate together, the surface was covered by Al2O3 layer. The particle size of nano-Al powder obey normal distribution and the average particle size increases with the increasing of wire diameter.
The Research of Yttria Stabilized Zirconia Coatings formed by a low Pressure Thermal Spraying Plasma Torch
Authors: Sun Chengqi , An Liantong , Gao Yan
Published: June 2020

To enhance deposit efficiency and improve quality of the coatings of the Yttria stabilized zirconia (YSZ) formed by the thermal plasma spraying method. A new kind plasma touch with diverging-converging nozzle and an internal powder feedstock were designed. The optical emission spectroscopy method was used for evaluating powder molten and vaporized degrees. The results indicated that the plasma jet produced by the two kinds of plasma gases under the 700 a condition made the feedstock powder of YSZ vaporized partially, but different melting degrees. Denser column microstructure YSZ coatings were first successfully deposited at an arc current of 700 A by using Ar-He-H2 plasma gas. In the Ar-H2 plasma jet, the temperature is higher at the same axial distance. The micro-hardness of the coatings deposited by Ar-He-H2 plasma gases is higher.
Analysis on the Relationship between Green Finance and Green Development of Guangdong Province
Authors: Huang Weihua , Wang Yiru , Chen Haiye
Published: June 2020

Policies about sustainable development are carrying out in China. From two perspectives to study whether green finance promoted the green economy development in Guangdong or not by grey correlation analysis. The results of using Guangdong’s green financial data were not supported this hypothesis, while the results of using national financial data were supported this hypothesis. The reason is that Guangdong even Guangdong, Hong Kong and Macao Greater Bay area is one of the most developed regions in China, which shows a gatherring effect, and the resources of the whole country flow into Guangdong continuously. That play an important role in green development in Guangdong.
Study on Anti-radiation Effect of Ya’an Tibetan Tea
Authors: Xu Jingyi , Liang Xing , Wang Weiyi , Chen Shengxiang , Tang Qian
Published: June 2020

To explore the protective effects of Ya ’an Tibetan Tea on 60Coγ irradiation damage in mice, forty-eight male SPF mice were randomly divided into six groups, including normal control group, irradiation control group, positive control group and Ya’an Tibetan tea low, medium and high-dose groups. Each group of mice were administrated with corresponding test samples for continuously 15 days. All mice were irradiated by 60Coγ-rays at the dose of 5 Gy except normal control group on the 6th day. After gavage, the mice were dissected and blood was taken from the eyeballs. The total antioxidant indexes of liver tissues, peripheral blood cells, and bone marrow DNA content of the mice were measured. The results showed that compared with the radiation control group, the contents of peripheral blood cells in the three dose groups of Ya’an Tibetan Tea increased in varying degrees, with the largest increase in the medium=dose group. In the medium=dose group, WBC were significantly increased (P<0.01), and RBC were increased (P<0.05), and the content of bone marrow DNA of the medium-dose group was significantly different from the radiation control, and MDA significantly decreased (P<0.01), and T-SOD activities and T-AOC activities significantly increased (P<0.01). The study shows that Ya’an Tibetan tea has a strong protective effect on radiation-damaged mice, and the medium-dose group has the best effect.
Research on the performance of Cu-Fe-Pd-La/FSC catalyst based on COD
Authors: Zhang Yongli
Published: June 2020

The catalysts were prepared by impregnation method, and the simulated printing and dyeing waste-water was treated by CWAO method. Based on the COD rates of treated waste-water, the influence of composition of Cu, Fe, Pd and La on catalyst activity and stability was investigated. The results showed that Cu-Fe-Pd-La/FSC catalyst, composed of Cu: Fe:Pd:La = 1:1:1:3 catalyst, had a COD removal rate of 85.43%, and the Cu and Fe concentrations of the treated waste-water were 0.54 mg/L and 51.96 mg/L, respectively. The catalyst has good catalytic activity and stability.
Three-Dimensional Evacuation Model with Applicability Based on the Theory of Cellular Automata
Authors: Yu Bozhong
Published: June 2020

With the increasing number of terror attacks in France, evacuation plans at the Louvre, which receives tens of thousands of visitors every year, has become the key to the safety of visitors. Our goal is to make a reasonable emergency evacuation plan. First, we establish a two-dimensional evacuation model, based on the model, we build a three-dimensional cellular automaton model, which takes the speed of moving up and down the stairs of the occupants, positional attraction and probability of collisions into consideration. Second, we use Pathfinder for simulation. Finally, we find that the exit 1(secondary entrance) should be opened when the visitor density is high, while the exit 3 should be opened when the visitor density is low; and the Passage Richelieu entrance has the greatest influence on evacuation time, and emergency personnel should choose the Pyramid entrance as their emergency entrance.
Brief probe into Decorative Design of Children’s Learning Center
Authors: Chen Lingjie
Published: June 2020

From the perspective of edutainment, this paper summarizes the basic principles and methods of the interior decoration design of the children’s learning center by means of survey data, data analysis and analysis of practical design cases, and initially explores how to achieve the effect of edutainment through effective design methods.
Study on Enzymatic Characteristics of Cellulose Produced by Aspergillus fumigatus and Optimization of Enzyme Production Medium
Authors: Sui Ming , Rong Jiachao , Zhang Yang , Zhang Fengying , Li Junru
Published: June 2020

In addition to providing the necessary nutrient conditions for the growth of cells, the medium also provides a substrate for functional products. Fermentation medium optimization plays an important role in improving the fermentation level. At present, orthogonal design, response surface design, and uniform design are widely used to optimize the composition of the medium, and the effect is very significant. On the basis of exploring the enzyme-producing characteristics of Aspergillus fumigatus LY1 strain, the concentration of each component of the enzyme-producing medium was optimized by using the straw combination as the substrate and the central combination design.
GIS vibration fault simulation experiment and analysis
Authors: Qu Bin , Zhang Li , Gan Zhiyong , Chen Rong , He Jin , Li Guohao , Geng Ruiqin
Published: June 2020

In order to provide some theoretical and technical basis for the vibration test and analysis of GIS, this paper introduces two vibration fault simulation experiments of GIS. One is the simulation experiment of spike discharge, the other is the simulation experiment of flange bolt loosening. It includes both discharge fault and mechanical fault. The experiment shows that the vibration signal can reflect the discharge fault and mechanical fault well, and show different characteristics, which is very instructive for the field application of GIS vibration test.
Mooring Chain Working State Detection Device
Authors: Liu Lu , Yu Pingqing , Liu Kaijie
Published: June 2020

In order to change the current situation that the mooring chain magnetic particle detection is completely completed manually by workers, and improve the detection coverage accuracy, an automatic mooring chain full-ring magnetic particle detection device has been developed to fill the domestic gap. The device is mainly composed of 4 parts: a vertical scanning mechanism, a circular rotation mechanism, a probe linear motion mechanism and a probe adaptive mechanism, which have a total of 6 degrees of freedom. At the same time, ABAQUS finite element analysis software was used to check the static strength, stiffness and dynamic characteristics of the large-span vertical scanning mechanism in the device. The calculation results show that the static strength and stiffness of the vertical scanning mechanism are reliable; the driving pulsation frequency is far from the main excitation frequency, and the structure has good dynamic characteristics.
Measurement and analysis of thermal expansion coefficients of mortar and limestone cooled to cryogenic temperatures
Authors: Feng Wenqi , Li Yang , Yuan Qijie , Xie Zhongzhi , Ding Geyuan , Ji Chenyu
Published: June 2020

The force caused by the difference of thermal expansion coefficient between concrete aggregates at ultra-low temperature will inevitably affect the structure and should be considered in the structural design. The coefficient of thermal expansion of cement mortar and stone was measured by resistance strain gage test technology in ultra-low temperature environment, and the variation law of average linear expansion coefficient with temperature was obtained. The results show that the thermal expansion coefficients of cement mortar and stone have similar variation rules with the change of temperature. The stress state of cement mortar and stone under ultra-low temperature does not affect their thermal expansion coefficient. Thermal expansion coefficient of cement mortar under ultra-low temperature is affected by size effect.
Partial Least Squares Regression for Predicting the Speed of Electromagnetic Fuze Plate
Authors: Wang Wenyun , Li Huarong
Published: June 2020

The partial least squares regression method was used to establish the regression equation of the speed of the fuze plate after cross validation test. Combined with the measured data, the speed of the fuze plate was analyzed. The results show that the partial least squares regression model effectively overcomes the multiple correlation problem of independent variables, has good interpretability and high fitting accuracy, and is an effective method for analyzing the characteristics of the fuze plate’s speed parameters.
Synthesis and Characterization of NbSe2 and Tribological Properties of Cu/NbSe2 Composites
Authors: Shi Qin , Zhu Hejun , Dang Lifeng
Published: June 2020

Copper-based composites with different content of NbSe2 were fabricated by power metallurgy, their microstructure, microhardness and tribological properties were investigated systematically by using X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and wear tester. Results showed that with NbSe2 addition, except main phase Cu, minor phases such as CuxNbSe2, Cu2Se and remaining NbSe2 were formed in the composites. The microhardness of copper-based composites increased firstly, then decreased with the addition of NbSe2, but was higher than that of pure copper. Also, the wear resistance of composites was also enhanced greatly, especially for the simultaneous addition of 20%wt.NbSe2.
Design of special vehicle condition monitoring system based on J1939
Authors: Shao Xuan , Kang Xingwu , Wang Xuping , Yuan Xiaojing
Published: June 2020

The special vehicle is one of the important equipment in China’s military and aerospace fields, and its condition is closely related to the success of the mission. In view of the lack of real-time condition monitoring capability of special vehicles, a condition monitoring system based on J1939 protocol is designed in this paper. The system communicate with the Electronic Control Unit (ECU) in Controller Area Network (CAN) through the On Board Diagnostics (OBD) interface to obtain the real-time condition data of the vehicle and improve the active safety of the vehicle. The test results show that the system realizes the data exchange with the Electronic Control Unit (ECU), outputs the data to the personal computer (PC) through the serial port, realizes the protocol data visualization, and meets the expected design purpose.
Synthesis of ZnO nanorods based on electrospinning technology
Authors: Lu Xiuzhen , Sun Yongqian , Jiang Ziwei , Zhang Maomao , Lin Yang
Published: June 2020

A new method for fabrication of ZnO nanorods was reported. ZnO nanorods were synthesized by electrospinning technology and heat treatment with polyvinyl alcohol (PVA) and Zinc acetate as precursor. After heat treatment of ZnO electrospun nanofibers, ZnO nanorods were obtained. Morphology of ZnO nanorods was characterized by Scanning electron microscopy (SEM). Various morphologies, such as sphere, flower and plane composed of ZnO nanorods were observed. Transmission electron microscopy (TEM) images demonstrated ZnO nanorods are a single crystalline structure with a diameter of 100-180 nm. The hexagonal wurtzite structure of ZnO nanorods was determined by X-ray diffraction (XRD) pattern and Raman spectra.
Preparation and Analysis of Transition Metal Chromium-Doped Mesoporous Silica
Authors: Liu Longjiang , Xiang Pengzhi , Huang Yao , Tang Fang
Published: June 2020

Cr-doped mesoporous silicas with a two-dimensional hexagonal mesopore structure as well as with a cubic mesoporous framework have been synthesized by using 1-hexadecyl-3-methylimidazolium chloride as structure directing agent template and tetraethylorthosilicate (TEOS) and Cr (NO3)3·9H2O as precursors via hydrothermal synthesis method under alkaline conditions. The effects of the concentration of chromate on hexagonal mesophase and the reaction time on cubic mesophase were discussed in detail. The samples were characterized by X-ray diffraction andthermogravimetry (TG) techniques. The results show that the template has been completely removed when the sample is calcined at 550°C; the ordered long-range mesostructure with hexagonal and cubic phases can be obtained by adding appropriate amount of chromium salt.
Study on Chemical Properties and Organic Carbon Components of Vermicomposting
Authors: Yao Xusong , Qiu Dongping , Gong Li , Yang Gang
Published: June 2020

This article is to study the chemical property and organic material of the earthworm casts in three different places. The study shows that the earthworm casts contain plenty mineral elements, in which some toxic element still exist such as As, Cr, Cd, Pb etc. Besides, the earthworm cast is rich in organic material compared to common soil, which can over 60mg/L. What’s more it contains plenty amino acid especially Glu, Asp and Pro. Above all, the earthworm cast contains plenty mineral elements, organic material and amino acid. Thus can be fertilizer. But with some toxic element, it can make negative effect on environment.
Application of integrated manufacturing system of flexible production line in spacecraft manufacturing line
Authors: Tian Chenghua , Jia Pei , Yuan Junfeng , Teng Bowen
Published: June 2020

The realization of automatic control and information management is an important basis for the automation, information and intelligence of manufacturing industry. We have applied computer and network technology, programmable control technology, field-bus technology, information management and other technologies to the control, monitoring and management of the production line. We have developed a flexible production line integrated manufacturing system, which realizes the local monitoring and remote monitoring management of the operation status of multiple equipment on the production line of manned spacecraft manufacturing equipment, and creates a new intelligent manufacturing system Pattern.
A frequency correction method based on axisymmetric function
Authors: Li Yanglong , Gao Xiangyu , Xiao Yunhui , Meng Ya
Published: June 2020

In this paper, a frequency correction method based on axisymmetric function is presented first and the analytical solutions of three forms of axisymmetric equations with three points are developed to correct the frequency. A complex exponent signal with exact solution is used to demonstrate the accuracy and theory of the proposed method by comparing it to the traditional methods with fast Fourier transform. (FFT) Moreover, the proposed method is applied in solving for a frequency identification of free attenuation vibration signal based on finite element model of actual building structure and the results show a good agreement with experimental and structural modal simulation results, which demonstrates the validity of the proposed method for solving frequency problems of building structure and others.
Mechanical and thermal properties of phase change energy storage concrete
Authors: Zhang Yichao , Zhang Zhongren , Zhou Jinghai , Wang Ying
Published: June 2020

Phase change energy storage particles have excellent thermal properties. The phase change energy storage concrete prepared by adding phase change energy storage particles to concrete has excellent mechanical properties and thermal properties of concrete. Choosing appropriate phase change materials and mix proportion can effectively reduce the energy consumption of concrete buildings on the premise of meeting the requirements of compressive strength. In this paper, the mechanical and thermal properties of phase change energy storage concrete are reviewed, and the existing problems are analyzed, and the future development trend is prospected.
Analysis of Thermoelastic Failure Mechanism of High-Speed Planar Friction Components
Authors: Liu Yue , Bao Ke , Luo Xianjie , Liu Chunlin
Published: June 2020

High-speed planar friction components are widely used in the compaction machinery and vehicle industries to achieve power transmission functions. During the working process, the thermoelastic coupling state of each friction pair in the high-speed planar friction component is very complicated. The finite element numerical calculation method is used to perform transient thermoelastic analysis on the friction component, and the influence of key design parameters on its thermoelastic failure is found out, which is the foundation of structure and reliability design. Taking the multi-plate clutch of the vehicle transmission system as an example, this paper analyzes the change pattern of transient thermoelastic state of each contact surface and the impact of the fixed way on the thermoelastic state during the compaction process. Research shows that the unevenness of the initial contact pressure of the friction pair increases gradually during the compaction process, and the unevenness of the first and second contact surfaces is most obvious. When the fixed steel plate is fixed only on the outside, the thermalelasticity of the contact surface is more uneven and it is prone to thermoelastic failure.
Simulation of micro plastic filtration for existing filters
Authors: Liu Xuan , Yang Chenglong , Zhang Wenze
Published: June 2020

This paper uses DPM model in Fluent to divide the mesh and conduct fluid analysis for the existing family filter, by using the Rosin - Rammler distribution simulated reality of different diameter of the plastic particles’ distribution in the water. Secondly, using particle tracking algorithm to calculate the distribution of particle diameter of the export, so as to check the existing household filter’s ability for the different plastic particle diameter.
Ping pong alphago integrated table tennis service robot
Authors: Zhao Lida , Li Xinhuan , Chen Zixuan
Published: June 2020

In order to achieve multi-dimensional multi-directional launching and intelligent walking functions, the robot can be divided into launching module, angle adjusting module, displacement moving module, ball storage module, collection module and walking module.
The Complex Use of Wave Potential and Flow Energy
Authors: Li Xinhuan , Wei Wenqi , Zang Tianshuo
Published: June 2020

A device for automatically adjusting the angle of solar panel is designed by using the temperature difference effect produced by solar energy. The device can automatically sense the angle and intensity of sunlight to form a temperature difference. The temperature difference is converted into a pressure difference by a temperature difference collector, and then the pressure is converted into the power needed to adjust the angle of solar panel by a pneumatic push rod, so as to realize the automatic light alignment of solar panel. The temperature sensing and pressure forming automatic light tracing device designed by this device has better usability and popularization. It can be applied to the automatic light tracing of solar panel, effectively solve the cosine effect caused by the change of solar light angle, and reduce the problem of low power generation efficiency caused by light tilt and short life of traditional electric control light tracing device.
Research on Parametric Finite Element Analysis Method of Escalator Truss
Authors: Jiang Jie , Wang Shuijun , Zhao Lidan , Wu Haiping , Kong Lingxiang
Published: June 2020

On the premise of ensuring the structural strength and safety performance of escalator truss, in order to improve the efficiency of design and development of serial escalator truss, a parametric finite element analysis platform for escalator truss is developed by using the secondary development of finite element method and Visual C++ and data interface technology. In this paper, the structural design and strength characteristics of escalator truss with different parameters are studied, and the strength characteristics of escalator truss with maximum boundary load are analysed. The results show that by using the parameterized finite element analysis platform of escalator, users can get the structural strength results of the serialized truss through automatic modelling calculation only by inputting parameters. While satisfying the structural strength of the truss, the analysis process is greatly simplified and the analysis efficiency is improved.
Based on the Principle of the Rotation of the Center of the Reuleaux Triangle Water Saving Sprinkler
Authors: Nie Zijie , Zhao Lida , Chen Weijie
Published: June 2020

In this paper, a water-saving sprinkler is designed with the property that reuleaux triangle can make the center move around the circle and make the curved edge track square. When the sprinkler sprays at a fixed angle, the sprinkler area can be square after a certain period. Through the overall structural design of the sprinkler, the design and analysis of the translation device and the rotation device, the design and analysis of the water supply system, the design and analysis of the support structure and other aspects, the model is built. The utility model can realize the maximization of the water utilization of the sprinkling irrigation system, reduce the waste of water resources caused by over-spraying, can also be used for crops with high requirements on the uniformity of the water environment, and reduce the damage to the growth of species of plants caused by uneven water environment.
Research on self balance test method and numerical simulation of bearing capacity of pile foundation
Authors: Su Huifeng , Li Renzhuang , Lv Yujie
Published: June 2020

In order to check whether the pile foundation meets the requirements of bearing capacity and set the position of the test load box reasonably, this paper takes the bearing capacity test of the test pile of the large-scale high-speed railway station as the breakthrough point, and carries out the self balance test on three test piles. At the same time, MIDAS/gtsnx was used to simulate the test process. The axial force and displacement values of three test piles under different loads are measured through the test, and the compressive bearing capacity and the best load box position of the pile foundation are obtained by analyzing and processing the experimental data.
Residual Bearing Performance of RC Beam Supporting Column Joint after Fire
Authors: Kong Weiyi , Fu Chuanguo , Song Yamin
Published: June 2020

In this paper, the residual load bearing performance of RC beam supporting column joint after fire is studied. Using the finite element analysis method, considering the influence of heating time, the thickness of the longitudinal reinforcement protective layer and the additional reinforcement, the bearing performance of the beam supporting column joint specimen after fire is analyzed respectively. The results show that the shorter the duration of high temperature, the smaller the change rate of the deflection of the beam supporting column joint under static load, and the lower the deformation of the beam supporting column joint under load can be reduced by the setting of additional steel bar, which plays a beneficial role in the residual bearing performance of the joint.
Research on the Resistance of Pier C45 Concrete to Chloride Ion Penetration
Authors: Sui Honglei , Meng Zhiliang
Published: June 2020

For composites with 50%, 60% and 70% concrete content of fly ash and grinding blast furnace slag, 17 composite ratios were designed. The effect of composite ratio of mineral admixture on the migration coefficient of chloride ion of C45 bridge pier concrete was studied by test method for rapid chloride ions migration coefficient. The cost analysis of the concrete which meets permeability of resistance to chloride ions was carried out. The results show that: With the increase of the proportion of fly ash and grinding blast furnace slag, the 28d chloride ions migration coefficient of concrete with different admixtures is generally reduced.
A Novel Adaptive Attention Model for Image Captioning
Authors: Liang Donglin , Wu Jinzhao , He Anping , Ding Ming
Published: June 2020

Image captioning is an extremely challenging work, which involves both computer vision and natural language processing. However, in recent years, with the introduction and improvement of various new technologies, it has made a great advancement. In this paper, a novel attention-based image caption model is proposed. We use Resnet harnessed by outstanding performance in convolutional neural network, as the encoder. For the decoding, LSTM network equipping with fitness of dealing with problems highly related to time series, is adopted. At each time step, the attention mechanism guides the language model to synthesize context vectors adaptively. The experimental results show that the model has good performance in various quantitative metrics as well as in human evaluation.
Deformation Mechanism of Thin and Medium-Thickness Cylinder and Its Collapse Strength under Bending
Authors: Cao Lihu , Dou Yihua , Liu Junyan , Li Mingfei , Zhang Wei
Published: June 2020

Considering the influence of flattening of casing cross-section on collapse, the stress equivalence principle was applied to conclude the triaxial stress and collapse strength. The method to determine casing collapse strength considering flattening of casing cross-section was established. The diameter-to-thickness ratio had a major influence on the flattening of the casing cross-section compared with curvature. For the 5 1/2”×7.72mm P110 casing, the flattening coursed by the 0.01/m curvature decreased the collapse strength concluded by API 5C3 by approximately 7.5%.
Research on the effects of salt doping on the suiface morphology of alumina thin films
Authors: Chen Ling , Fu Feie
Published: June 2020

We envisage that by the method of adding salt compounds, then washing them after the film sintered can produce holes inside and in the surface of the alumina film such as cheese-like, so that the organic matter can enter the aluminum oxide inside. Alumina can play a role in protecting internal organic matter from friction and prolong the use of hydrophobic film in the use. In the experiment, we found that the surface of the thin film with mixed magnesium acetate can form a good roughness.
Design of Lane Separation and Centralized Collection Mechanical Device for Detergent
Authors: Wang Peng , Yu Liang , Miao Lei , Zhang Long
Published: June 2020

The filling and packing of liquid heterotypic bottle products are the necessary process for them to enter the market. For the packing operation of detergent, it is necessary to transfer the single row state of continuous transportation after filling to the collection and packing of multiple products at one time, and the lane separation and centralized collection device plays an important role in this process. The prototype design and structure design are carried out. Aiming at the problems of jamming, dumping and belt deviation in actual production, the cause analysis and structure improvement design are completed. The experimental results show that the improved structure operates stably and meets the use requirements.
Research on Torque Characteristics of Clamping Bolts for PEMFC Stack under Strengthened Durability Vibration
Authors: Zhang Yanyi , Hao Dong , Wang Renguang , Hou Yongping
Published: June 2020

To investigate the bolt torque attenuation feature of PEMFC stack under static test and vibration test conditions, 2-hour static test and 300-hour enhanced road vibration test were carried out in turn. The results show that the attenuation of bolt torque are related to their locations during the static test, also the attenuation of bolt torque is obviously related to their locations during the 300-hour vibration test. Moreover, the test results also show that there are different regularities in different vibration test periods.
The surface denaturation analysis of lithium disilicate glass ceramics milled by ultraviolet picosecond laser
Authors: Hu Peixin , Yao Lu , Lue Qitao , Ji Encai , Nie Zilin , He Zhengdi
Published: June 2020

Dental glass ceramic has good optical properties and biological compatibility. This material has been widely used in the field of the porcelain restoration. Because the shape of the missing tooth varies from patient to patient, dental restoration need to be personalized. Traditional CAD/CAM milling cutter method has problems of high wear cost, low processing efficiency, general processing accuracy. In this study, a 30W ultraviolet picosecond laser was used to mill lithium disilicate glass ceramics. The transparent recoagulation layer and cracks were formed in the condition of some special laser parameters. X-ray diffraction (XRD) material composition test showed that the main composition of the transparent recoagulation layer was not changed. The surface denaturation of different laser cutting parameters were analyzed. The experimental results showed that whether the transparent recoagulation layer generated is the comprehensive result of the laser parameters which contains output power, repetition frequency and scanning speed of galvanometer. The reasons of the transparent recoagulation layer and cracks produced by laser were discussed. By optimizing the laser parameters, the formation of transparent recoagulation layer and cracks can be avoid. The test laid a good experimental foundation for the ultrafast laser milling dental glass ceramics equipment.
Reviews on the Quality of China’s Agricultural Products Export to United States
Authors: Wang Liyuan , Zhang Pu , Xiao Bin
Published: June 2020

The export of characteristic superior agricultural products plays an important role in realizing China’s agriculture going out and realizing the transformation from total expansion of agricultural products to quality expansion. This paper systematically combs the relevant literature at home and abroad from three aspects: the theory of agricultural trade, the gap between the quality of agricultural products between China and the United States and the factors affecting the quality of agricultural products. The progress and shortcomings of the research on quality control of agricultural products in China were compared and commented, based on the systematically combing of the relevant literature at home and abroad from two aspects: the gap between the quality of agricultural products between China and United States, and the factors affecting the quality of agricultural products. Then three research directions were put forward: promoting the quality upgrading of agricultural products, differentiating the export quality of different agricultural products, and then formulating national export standards for agricultural products, and realizing the transformation and upgrading of agricultural products in export competition. This research would be useful for the exploration and practice of the export quality of agricultural products in China.
Numerical Analysis on Excavation Stability of Primary Support Arch-cover Method
Authors: Li Wei , Li Kexian , Zhang Shijie
Published: June 2020

The primary support arch-cover method is a construction excavation that can effectively deal with upper soft and lower hard strata, but its deformation sensitivity is relatively large in shallow buried strata, and there are still problems in applicability when it occurred to large spans. This paper takes a hidden excavation station in Qingdao as the research background, and uses FLAC-3D simulation software to carry out numerical simulation calculations for the entire excavation of the primary support arch-cover method. The study analyzes the changes in stress and displacement of surrounding rocks under different excavation procedures. The results show that the excavation of the middle diversion tunnel is the process where the stress of the surrounding rock changes the most; the maximum stress and displacement of the rock and soil in the upper part of the station cavern happens when the arch structure is excavated; the surrounding rock remains basically unchanged during the excavation of the lower section. The safety and stability of the excavation process indicates that the method can be applied to metro stations in shallow buried hard rocks, providing a certain reference for similar projects.
Formation pressure prediction technology of infill point in low permeability oilfield
Authors: Wang HaiSong
Published: June 2020

Poor reservoir physical property which leads to low rate of water injection pressure decline after the shut-in because of drilling control is the main characteristic of Daqing peripheral oilfields. To reduce reservoir energy loss, ensure the effect of infilling well, it is necessary to study the formation pressure of infill well point. However, there is no formation pressure prediction formula for infill well point in low permeability reservoir. In this article, combined with detailed reservoir description results, the effective characteristics of formation with different permeabilities are analyzed, the range of effective displacement permeability are defined, and the formation pressure of infill well point is calculated based on reservoir engineering method. Meanwhile, according to the actual injection pressure, produced liquid volume and partial static pressure data, numerical simulation pressure prediction is presented to simulate infill well point pressure. Considering to both prediction results, formation pressure at infill well point can be determined. Field test verifies that the predicted pressure is close to the actual pressure with an error rate within ± 10%, wells with pressure coefficients less than 1.80mpa/100m can be drilled, and those with the pressure coefficients greater than 1.80mpa/100m, drilling should be processed after depressurization.
Experimental study for the influence of Starch on Briquette Pyrolysis Characteristics
Authors: Cui Shuai , Bo He , Yang Xueyi
Published: June 2020

The influence of starch on the pyrolysis was studied from macro and micro angles. In this paper, briquette pyrolysis was operated with thermal analyzer. The experimental data showed that with the increase of starch content, the reaction rate was increased and the activation energy was decreased. The calorific value was improved in the briquette with starch. The starch does not change the oxygen-containing functional groups of the briquette, just increased the number of hydroxyl. And the specific surface area was increased, but the pore volume and the average pore size were decreased of briquette compared with the coal though the micropore morphology analysis.
RETRACTED: Evaluation method of gas well dynamic reserves in low permeability gas reservoir based on big data analysis
Authors: Cai Xingli , Yang Zhaolin , Wu Yong , Niu Jihong , Yin Hongrong
Published: June 2020

The evaluation of gas well dynamic reserves is the basis of gas reservoir development potential analysis, technical policy-making, economic benefit evaluation. The low permeability gas reservoir has a small percolation capacity, long pressure recovery time and limited formation pressure test data, which bring great difficulties to the evaluation of gas well dynamic reserves. Based on the development practice data of more than 1000 gas wells and over 20 years of M gas field in ordos basin, the relationship model between dynamic reserves of gas wells, casing pressure and cumulative gas production volume was established through big data analysis, to quickly evaluate the dynamic reserves of gas wells in low-permeability gas reservoirs using conventional production data. The production practice of the M low permeability gas field shows that this method can effectively improve the number and accuracy of dynamic reserves evaluation wells
Adoption of Distributed Optical Fibre Sensing Technology in Geological Engineering under Three-dimensional Visualization Environment
Authors: Xu Jiangtao , Yang Zhenwei
Published: June 2020

To better solve the problem of data noise caused by the application of optical fibre sensing technology in geological engineering, the overall design of geological engineering monitoring system in three dimensional (3D) visualization environment is firstly carried out in this study, and the data processing module of distributed optical fibre sensing system is designed in detail. Then feature compression algorithm is proposed for the smooth de-noising of geological monitoring data feature. Finally, through the comparison of the data smoothing de-noising of geological engineering with the compression algorithm proposed in this study, the desiccating effect is verified by using three indexes of signal-to-noise ratio, mean square error, and smoothness. The results show that the feature compression algorithm has a good effect on the smooth de-noising of geological monitoring data. At the same time, more unnecessary information is omitted in the adoption of geological engineering, and the smoothness of curves is taken into account, which greatly promotes the widespread application of distributed fibre optic sensing technology in geological engineering.
Research on Intelligent Control Based on Multi-Agent Technology and Its Application in Robot Field
Authors: Nan Jiangping , Wang Juanjuan , Liu Junhui , Jia Yajuan , Wang Yaya , Wang Yanan
Published: June 2020

Firstly, the definition and characteristics of multi-agent technology are described. By analyzing the application research literature of multi-agent technology at home and abroad, the basic research of multi-agent system is analyzed and the technological development in the direction of multi-agent consistency and control is combed. Then the technical methods of intelligent control are analyzed, and the application of intelligent control in robot field is analyzed and explored. It is pointed out that the advantages of intelligent control are open, hierarchical and distributed structure, strong comprehensive information processing ability, and good at handling uncertain, highly nonlinear and complex control tasks of the model. Its shortcomings are that the theoretical basis is still in the development stage, the control accuracy is not high, and the real-time performance is poor. Finally, the development direction of intelligent control is expounded in combination with the above contents, hoping to create conditions for the overall improvement of Chinese intelligent control technology.
Preparation of a-IZO thin films by RF magnetron sputtering for Cu (In, Ga) Se2 solar cells
Authors: Jiang Haiyan , Wang Shuai , Xu Ying , Yang Shaopeng
Published: June 2020

Indium zinc oxide (IZO) thin films were prepared by radio frequency magnetron sputtering at room temperature for the applications of Cu(In,Ga)Se2 (CIGS) solar cells. The effect of the RF power during the deposition process on the structural, optical, and electrical properties of the films was investigated. XRD analysis revealed that all films showed an amorphous phase. The average optical transmittance in the range of 300-1500 nm decreased with increasing deposition power. Hall effect measurements show that the optimal hall mobility of 34.22 cm2/Vs and resistivity of 4.09×10−4 Ω•cm were obtained at the power of 90 W. The optimized IZO film was applied to CIGS solar cells, and an efficiency of 13.81% in CIGS solar cell has been achieved.
Implementation of a lightweight RFID security authentication protocol system
Authors: Zheng Ying , Zou Mi , Hu Guobo
Published: June 2020

RFID technology is particularly important for the security certification of its system due to the limitations of its own resources. This paper designs and implements an RFID system experimental platform consisting of programmable tags, readers and servers and application software. At the same time, a secure authentication protocol based on one-way hash function and static ID mechanism is proposed. The protocol applies to system performance requirements and security requirements. The results show that the protocol can effectively solve security problems such as eavesdropping, replay attacks, and loss of synchronization. This system helps protocol designers analyze and compare the security protocols of RFID systems, and at the same time fills the gaps in experimental systems in this field.
Development mode and distribution characteristics of biolimestone of the Shahejie1 Formation in the Changdi Area of the Zhanhua Sag
Authors: Xie Chuanjin
Published: June 2020

Using core, drilling, logging and seismic data, the development and sedimentary evolution of biolimestone of the first member of Shahejie Formation of Zhanhua Sag were researched. The first member of Shahejie Formation Changdi Area is defined as a third-order sequence, and the biolimestone developed in the first member of Shahejie Formation was divided into three fourth-order sequences. The lacustrine transgressive system tract and the lacustrine regressive system tract, where the biolimestone both developed were also identified. The development of biolimestone is influenced by paleoclimate, relative paleowater depth and paleogeomorphology. There are three types of paleo water depth variation in the Member of Shahejie Formation, namely the water withdrawal, the high position water and the low position water. Through paleogeomorphology restoration, it is clear that the biolimestone in the first member of Shahejie Formation is mainly distributed in the southeast and eastern slope trough, and then it is determined that there are two development modes in the study area, which are the biolimestone developed in gentle slope and the biolimestone developed in trough. Due to the periodic change of the lake level, the distribution of the biolimestone in the first member of Shahejie Formation also changed correspondingly. The biolimestone is thicker around the uplift and thinner along the gentle slope direction, and its belt-like distribution is parallel to the periphery of the buried hill.
Study on the regularity of the development of fracture Remaining Oil in Taizhao Oil Field
Authors: Guo Zhai
Published: June 2020

According to the data gathered from 49 core wells in Taizhao Oil Field, there are 17 wells without fractures and 32 wells with obvious fractures. Despite an average of 7.1 fractures in each well, there are 10 fractures in W426, W424 and W406 respectively in Taizhao Oil layer. After a preliminary analysis, the axial of anticline as well as the place near fracture are the areas for the development for fractures while the two limbs are under-developed. By describing regularities of distribution about fractures as well as remaining oil in a quantitative and qualitative way, this paper designs a flexible adjustment scheme aiming at the encryption and injection-production of complex fractured oil reservoir so as to improve the results of oil field exploration.
Application of drilling technology in prevention and control of water in coal mine
Authors: Zhao Shaofei
Published: June 2020

As an important technical means of coal mining, drilling has been widely used in coal mine waterproofing and water control. The complexity of underground coal mines increases the difficulty of drilling. This paper expounds the types of water damage in coal mine and analyzes the technical requirements before, during and after drilling.
Overview of urban rail transit energy feedback traction power supply system
Authors: Zhang Jiao , Li Yujie , Wang Yiwei , Li Bin
Published: June 2020

The power feedback traction power supply device is composed of rectifier unit and four - quadrant converter device. The four-quadrant converter device can work either in the rectifier state which can provide energy to the dc catenary or in the inverter state which can feed excess regenerative braking energy back to the ac power grid. At the same time, it can make reactive power compensation for ac medium voltage network and improve the power factor of the system. This paper mainly introduces the research technology of urban rail transit energy - fed traction power supply system.