bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on Chemical Properties and Organic Carbon Components of Vermicomposting
Authors: Yao Xusong , Qiu Dongping , Gong Li , Yang Gang 
Published: June 2020

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.
The Complex Use of Wave Potential and Flow Energy
Authors: Li Xinhuan , Wei Wenqi , Zang Tianshuo 
Published: June 2020

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

AbstractPoor 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

Abstract
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

Abstract
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