bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigation and Prediction of Soil and Water Loss in a Factory
Authors: Jian Cheng
Published: April 2021

According to the natural conditions of the project, the factors of soil and water loss during the construction of the project are analyzed, the investigation and prediction period, scope and prediction unit are divided according to the characteristics of the construction project, and the method of calculating the soil erosion modulus according to the formula is used to quantitatively investigate and predict the disturbance of the original geomorphology, the area of damaged soil and water conservation facilities, the possible soil erosion area and the amount of soil erosion.
Technical Research on Engineering Ships Based on Exploration Geological Conditions
Authors: Li Chengzhi
Published: April 2021

As the main ship type for offshore oil and gas field exploration, the comprehensive geological survey ship has multiple functions such as drilling and sampling, marine hydrological survey, and seabed topography and geomorphology survey. The paper briefly introduces the main technical features, general layout features, ship performance and ship positioning system design of a comprehensive geological survey ship. To improve comfort, the ship optimized the layout of the superstructure. At the same time, the positioning and operation of ships at sea are affected by the disturbance force of the marine environment, and the mathematical model of the dynamic positioning system controller is established. The system uses an active disturbance rejection controller to observe the ship’s motion status and the total disturbance of the power system in real time, and uses nonlinear feedback to compensate according to the system disturbance.
Prediction of soil moisture based on BP neural network optimized search algorithm
Authors: An Xiaoyu , Zhao Fuxing
Published: April 2021

The accuracy of traditional soil moisture prediction method is low and the training period is long. In this paper, the BP neural network prediction model is studied, and a longicorn beetle search algorithm (BAS) optimized BP neural network prediction method is proposed. Spelman rank correlation coefficient method is used to analyze the correlation between the change of soil moisture and each variable. In this paper, evaporation, ground temperature, precipitation, air pressure, sunshine hours, air temperature and wind speed are taken as independent variables to analyze the Spelman correlation with soil moisture, and the correlation between each variable and soil moisture change is obtained. The longicorn beetle search algorithm is used to optimize the initial weight and threshold of BP neural network, and the prediction model of BAS-BP neural network is established. The soil moisture prediction model of BAS-BP is compared with different prediction models of GA-BP and BP. The results show that the average absolute error and average relative error of BAS-BP are 9.1936 and 0.1333 respectively, which is lower than that of GA-BP and BP model. The shortcomings of long training time and slow convergence speed are overcome by BAS-BP neural network, and the accuracy of prediction is improved.
Analysis of Oil-water Distribution Law in Gulong Syncline Area of Southern Gulong
Authors: Yuanyuan Ma
Published: April 2021

In order to find the main control factors that affect oil-water distribution in Gulong syncline, the oil-water distribution law and main control factors of Gulong syncline in Gulong South were analyzed based on comprehensive evaluation. The research shows that Putaohua oil reservoir in Gulong syncline area of southern Gulong is mainly lithologic oil reservoir under structural background, and the distribution law of oil and water is controlled by structure, sedimentation and reservoir physical properties. The distribution characteristics of reservoir physical properties are the main factors that control the distribution of oil and water in this area. This paper optimizes the reserves on the basis of recognizing the distribution of oil and water, and finally delineates the area of the well potential area X.Xkm2.
Spatio-temporal variability in remotely sensed LST and its impacts by FVC in the Greater Khingan Mountains
Authors: Li Jianlin , Li Xuedong
Published: April 2021

The present study explored both the temporal variation and spatial distribution of fractional vegetation cover (FVC) and land surface temperature (LST) in the Greater Khingan Mountains, a location distinguished by four types of surface cover formations and strong gradients in meteorological conditions. Furthermore, we assessed the relationships between FVC and LST in different time-space dimensions. We measured the spatio-temporal variability in LST through a harmonic analysis of time series (HANTS) for 8 days of LST time series product data from the Moderate Resolution Imaging Spectroradiometer (MODIS). Furthermore, the FVC was extracted through linear spectral mixture analysis (LSMA). The results show that the time series image data reconstructed via HANTS are effective for quantifying the morphological dynamics of the thermal environment and enabling sound calculations of environmental variables, such as vegetation abundance. We found significant differences in within-year and interannual variation among different eco-geographical regions. The within-year maximum value of vegetation coverage was observed in July, whereas the surface temperature was highest in June. This finding suggests that the decrease in warming can be mostly attributed to the increase in evapotranspiration associated with increased vegetation activity. In addition, a strong negative correlation was found between the FVC and LST throughout the study area only from April to September, whereas a triangular relationship was found in other months. This study investigated the time series variations in different eco-geographical regions for 2000 – 2015 and revealed that the most obvious LST and FVC variations occurred at the region II and junction between regions III and IV. An analysis of the average FVC and LST from April to September indicated that 86.9% of the entire study area showed a negative correlation, such that when the FVC increased by 10%, the LST showed a maximum average decrease of 2.76°C. We conclude that the increase in vegetation activity is the main cause of the reduction in the LST and that surface activities and latitude zonality are the main driving factors of the LST differentiation in the Greater Khingan Mountains. These findings will serve as a foundation for future studies seeking to better understand climate change processes and to estimate ecosystem responses to changing climatic conditions.
Research on The Installation Window of Deepwater Subsea Xmas Tree
Authors: Qin Haozhi , Tan Liping , Liu Jian , Wang Bingxiang , Xiao Wensheng , Liu Guangdou
Published: April 2021

The purpose of this paper is to determine the safe operating window of subsea tree installation through analysing the sensitivity of multiple environmental parameters. In this paper, the wave height, period, phase angle and the sea surface current speed are taken as the evaluation factors of the marine environment, and a sensitivity ranking of these four factors is obtained by orthogonal analysis. The lateral offset and axial velocity of the tree, the axial deformation and von-Mises equivalents stress of the pipe are taken as constrain factors in sensitivity analysis. Results show that the wave height and period are the most significant affecting factor in sensitivity analysis. Finally, based on the given installation evaluation criteria, the installation operation window of the tree under different sea conditions are studied.
The Research on Urban Expansion and Spatial Correlation Based on VIIRS/DNB Data: A Case Study of Shandong Province
Authors: Yu Zifang , Zeng Wen , Cheng Xuming
Published: April 2021

The appearance of nighttime light (NTL) data allows us to experience urban development from more angles. This paper uses VIIRS/DNB monthly composite data to extract the urban built-up areas of 17 cities in Shandong Province. Then the built-up area extraction results in 2012 and 2017 are compared to determine the expansion type of each city. Finally, based on the intensity of city lights, we calculated the correlation between cities to show the strength of the connections between them. We find that the NTL values of Qingdao, Jinan, Yantai, and Weifang occupy the top four in Shandong Province, and this result is consistent with economic statistics. Laiwu, Qingdao, and Weifang have shown strong spatial expansion. Based on the growth area of built-up areas and urban development patterns in the past five years, the 17 cities in Shandong Province can be divided into four types: central expansion type (Jinan), multi-core development type (Rizhao), satellite diffusion type (Weifang) and mixed type (Zibo). We have summarized the characteristics of various types. There is little change in the spatial correlation between cities in 2012 and 2017. Cities such as Jinan, Zibo, Weifang, and Qingdao are closely related to other regions. The location degree of the city is also highest in these four cities, and the north and south sides of Shandong Province are lower.
Study on environmental nanomaterials in food industry wastewater
Authors: Liu Bei , Wang Qian , Zhang Yongli , Chen Xin
Published: April 2021

In recent years, with the rapid development of the food industry, the accompanying food wastewater pollution has become increasingly serious, which has become one of the most important sources of industrial wastewater and even water pollution in China. However, the traditional food wastewater treatment technology has gradually been unable to meet the needs of social development, and the development of cheap, convenient, and efficient food wastewater treatment technology has become a current research hotspot. Nanomaterials are capable of absorbing or degrading pollutants more than conventional materials. The innovation of water supply treatment technology has brought good opportunities. Due to its adjustable chemical form, it can realize the regulation of various excellent properties such as hydrophobicity, low dimension, photothermal conversion capacity, catalytic activity, and adsorption capacity, etc., which is very suitable for the removal of major pollutants in food industrial wastewater. The excellent adsorption properties and optical properties of different materials have realized the efficient removal of major pollutants from food industrial wastewater.
Research on Design, Construction and Maintenance Technology of Advanced Marine Research Ship
Authors: Gong Qiyong , Zhan Jun , Wang Pengzhi , Nie Xin , Zhao Lei , Shen Xing
Published: April 2021

In response to my country’s future planning for the design and construction of a new round of marine scientific research ships, the types, functions and layout areas of special equipment are subdivided to classify and explore the key points of special equipment installation and control for marine scientific research ships, and finally become more systematic Formed the installation control elements of various special equipment. Combining previous production design and construction experience of scientific research ships, the article focuses on the scientific layout of survey equipment, optimized design of cabin clear height, reasonable layout of laboratory equipment and related pipelines, vibration and noise reduction, electromagnetic compatibility, and modular design. On the other hand, analyse the key points of the comprehensive layout optimization design of the scientific research ship for reference for subsequent production design of the scientific research ship. Together with the experience and concepts of the shipyard, the comprehensive layout of the scientific research ship can be further improved, and the on-site construction modification can be reduced, thereby promoting domestic the construction quality of scientific research ships has improved to a new level, reaching the international leading level in all aspects.
Development and Application of BIM-based Foundation Pit Construction Simulation System
Authors: Wang Yixuan , Fang Xiaofeng , Fei Wei , Dong Wenpeng , Qin Maoxuan
Published: April 2021

Due to the increasing use of underground space in China, the number of foundation pit engineering is increasing. The emergence of BIM Technology has brought positive impact on foundation pit construction. This paper studies the foundation pit construction simulation system by using BIM technology. After the information processing of the Revit foundation pit model, the JSON format model is exported. With the JSON model as the core, the web-based foundation pit construction simulation system is built to realize the visual construction simulation of the foundation pit engineering. It is verified by the practice of the World Expo foundation pit project, which provides convenience for the project management and ensures the construction safety. It can be used for reference for the application of BIM in foundation pit engineering.
Giant Impact: The Leading Scenario of the Origin of the Moon
Authors: Song Ziyi
Published: April 2021

Moon, an astronomical body hanging in the sky, has been recorded and studied by mankind for thousands of years, even before the invention of the word “moon”. There are numerous varying theories about its origin. The aim of this article is to compare and further analyze the common theories of the origin of Moon. First, we provide basic information about the moon, the moon’s soil, and the basic elements of the moon and offer an introduction to solar and lunar eclipses and why they exist, as well as human efforts to explore the moon, including the Apollo program and the Chang’E program. Finally, we analyze and compare the four most common theories about the origin of the Moon: the split theory, homologation theory, capture theory and impact theory. Among all, the more accepted theory is the big collision theory though there is still no scientific basis for it. This article introduces the origins of the Moon by analyzing the pros and cons and describing possible future directions.
The transmutation and practice of environmental ethics
Authors: Hua Xu
Published: April 2021

Ethics is the basic principles and rules that guide people’s behavior. The transformation of ethics depends on morality and law, which in turn confirms and guarantees ethics. Regarding the relationship between human and nature, Eastern natural ethics and Western ethics have appeared successively. Among them, Western ethics has gradually developed from an anthropocentrism that only focuses on human interests to a transcendental natural ethics that considers man and nature as a whole, and converges with the basic principles of Eastern natural ethics, and finally realizes the sustainable development of man and nature. In this process of evolution, people supplemented with different morals and laws, which exerted different influences on nature. In the end, we need to strengthen corresponding education and guidance, and finally realize the organic unity of nature, human and society
Public Space Quality Evaluation of Xiqin Road from the Perspective of PSPL Research Method
Authors: Lv Shuyu , Ding Bin
Published: April 2021

This paper investigates Xiqin Road from the perspective of Yang Gail’s PSPL research method. This method could help us to understand and master the characteristics of people’s activities and behaviors in the public space of Xiqin Road. This paper analyzes qualitatively and quantitatively the research results and puts forward the optimization opinions and suggestions of the public space ib order to create a high-quality public space to meet the needs of citizens to carry out public life activity.
Analysis of Reservoir Plugging in Later Development Stage of ASP Flooding in Block X
Authors: Qing Yue
Published: April 2021

In the ASP flooding block X, there are some phenomena such as the abnormal law of agent concentration and the acceleration of water cut rise in some well groups. Analysis shows that it is mainly affected by the factors such as serious reservoir plugging and reservoir production situation decline. In this paper, injection wells in this block are divided into three categories: stimulation wells, non-stimulation wells and profile control wells and blocking condition and cause are analyzed. Based on this, the corresponding countermeasures are given for various wells. It can effectively improve the injection status of block X, so as to improve the development status of the block.
Redox Molecule Adsorbed Graphene Films with Compact Structure for Electrochemical Energy Storage
Authors: Zhu Yucan , Ye Xingke , Jiang Hedong , Jia Chunyang
Published: April 2021

Graphene films with compact structure and high ion accessible surface are essential to achieve dense energy storage with high-performance. Thus we prepared hydroquinone (HQ) adsorbed reduced graphene oxide (HQ-rGO) films with high packing density by capillary pressure. Hence, sulphuric acid was pre-intercalated between graphene sheets to reduce ion transport resistance, and adsorbed HQ molecules provide abundant pseudocapacitance. Finally, the two materials play a synergistic effect, significantly improving the capacitance performance. The resulting HQ-rGO films exhibit high volumetric capacitance of ~189.4F cm−3at 1mA cm−2, and after current density increase to 30mA cm−2, its capacitance retention can achieve 54% of original value, which demonstrates excellent rate performance of the device. Clearly, this strategy is great promising for fabrication of electrode material with high performance.
Effect of TiC and TiB2 Content on Properties of TiAl Based Alloys
Authors: Sun Zheng , Yang Liying , Wang Shouren , Wang Qimeng
Published: April 2021

In this paper, we added different content of TiC and TiB2 particles powder into TiAl based alloy as particle reinforcement, and prepared different components of TiAl based composite. We also studied the influence of the content of TiC and TiB2 particles on the physical and mechanical properties of TiAl based composite. The results show that in a certain range, the physical properties of TiAl based alloy increase with the increase of TiC and TiB2 particle content, and the mechanical properties first increase and then decrease with the increase of TiC and TiB2 particle content. It is proved that the physical and mechanical properties of TiAl alloy can be effectively improved by adding the proper amount of TiC and TiB2 particles.
Effect of Eu3+ Doping on Electrical Transport Properties of LaMnO3
Authors: Chen Jinhuan , Xing Ru , Zhao Jianjun
Published: April 2021

Perovskite manganese oxide La0.87R0.13MnO3 (R=La, Eu) polycrystalline samples were prepared by high temperature solid-phase reaction. The crystal structure was studied by X-ray diffraction (XRD). Through the resistivity-temperature (ρ-T) curve, the electrical transport properties are studied. The magnetoresistance-temperature (MR-T) curve was made to study the magnetoresistance effect. The results show that all samples in this group have good monophasic property and belong to orthorhombic system. In the measured temperature region, it belongs to semiconductor material, and the average ion radius of A position is different, and the influence of external magnetic field on electric conduction is different. The ρ-T curve fitting of the samples of this group shows that the samples of this group all follow the conduction mode of variable range jump in the measured temperature region. The magnetoresistance effect of Eu3+ doped samples is significantly increased, which is beneficial to the practical application of magnetoresistance.
The Multiple Sequence Alignment and Evolutionary Analysis of Angiotensin-converting Enzyme 2 Diverse Species
Authors: Sun Kexin
Published: April 2021

The sudden outbreak of new coronavirus (2019-nCoV) in Wuhan significantly influences in China, with wide attention attracted to investigate its origin, intermediate host, transmission pathway, and pathogenic mechanism. 2019-nCoV is very similar to SARS. They may use the similar receptor to recognize and attack host cell. Angiotensin-converting enzymes 2 (ACE2) is a main receptor of 2019-nCov and SARS, which interact with the surface spike glycoproteins (S proteins) of the coronaviruses. However, we still don’t know how the 2019-nCoV infected human and which species is the intermediate host. In this study we analyzed data of amino acid sequence of ACE2 and constructed phylogenetic tree. The phylogenetic tree showed ACE2 of human is highly similar to Pongo abelii and Pan troglodytes. Furthermore, our results suggest that Pongo abelii and Pan troglodytes may be another host and we must protect these animals from be infected. Our result is beneficial for a global pneumonia epidemic prevention.
Preparation of Physical-modified Mesoporous Silica
Authors: Li Kun , Zhang Peng , Zhou Feng , Ren Xianghong
Published: April 2021

Based on the concept of molecular design, mesoporous silica materials with different physical structure and morphology were prepared by adjusting the molecular chain length of surfactants and the mass ratio of anion-cationic surfactants. The composition and morphology of the prepared silica materials were characterized by FTIR, SEM, N2 adsorption and desorption. By adjusting the carbon chain length of surfactants and the mass ratio of anion-cationic surfactants, the preparation of mesoporous silica was carried out, and the effects of mesoporous silica on the internal structure of mesoporous silica were analyzed.
Cause analysis and prevention of fish scale crack defect for steel cord
Authors: Qin Renshu , Yang Haibo , Sun Xuewen , Zhang Shuyan , Bremen Sebastian
Published: April 2021

In the production process of a steel cord, for the surface defect of steel wire with a diameter of 3.42mm in the heavy-duty-drawing process of a semi-finished product, macro and micro-analysis were carried out, and the defect causes were verified through production field tests. It has shown that the unprotected hard collision during the transportation and the shoveling after arriving at the factory results in damages to the surface of the wire rod, which cause high temperature from the friction with the drawing die during the drawing process leading to the appearance of drawing martensite, and it eventually leads to the surface defects of the steel wire. Based on the reasons above, comprehensive preventive measures were formulated to reduce the frequency of occurrence for the surface defects on the steel wire.
Design and Experimental Study of a Tapered Fluidized Bed Reactor without a distributor of Carbon Nanotubes
Authors: Bai Wenjuan , Chu Dianming , Li Yan , He Yan
Published: April 2021

Fluidized bed reactor is a key component in chemical engineering. The tapered fluidized bed reactor (TFBR) without a distributor was innovatively used for the preparation of carbon nanotubes (CNTs) in this paper. And it was designed and studied experimentally. The tapered angle is an important part in the design of the tapered fluidized bed reactor. The parameterized design (5°, 10°, 11°, 13°, 15°, 18°, 20°) was carried out by using CFD analysis, and the optimal tapered angle was selected as 11°. The fluidization mass and behavior of the tapered reactor, the quality and yield during the growth of CNTs were studied experimentally. Results showed that the pressure drop of the multi-walled CNTs in the bed and the expansion process of the bed are in good agreement with each other in the process of acceleration and deceleration, and the fluidization in the bed is more uniform. Moreover, the yield of multi-walled CNTs reached 94.2 g and the quality of multi-walled CNTs reached 97.96 % in a linear increase within 1 h, which verified the feasibility and reliability of the reactor design.
The mechanism of treating chronic bronchitis by Fritillaria thunbergii was discussed based on network pharmacology
Authors: Zhen Cheng , Huang Xulong , Wang Xiangpei , Wu Hongmei
Published: April 2021

Objective: The mechanism of treating chronic bronchitis by Fritillaria thunbergii was studied by network pharmacology. Methods: The targets of active chemical components in Fritillaria thunbergii were predicted, the component-target-disease network was constructed, and the topological parameters of the network were analyzed; meanwhile, protein interaction network (PPI) was constructed, and gene GO functional annotation and KEGG pathway enrichment were analyzed. Results: There are 6 active ingredients and 44 potential targets of Fritillaria thunbergiiin the treatment of chronic bronchitis, the HRAS PIK3CA, CCND1, CDK2, AKT1, MTOR, known targets such as Fritillaria thunbergii may be important targets for the treatment of chronic bronchitis. The treatment of chronic bronchitis by Fritillaria thunbergii mainly involves the biological processes such as peptidyl serine phosphorylation, platelet activation, protein C terminal binding insulin binding, exogenous transport atpase activity, histone kinase activity and so on, major signaling pathways include prostate cancer, melanoma, estrogen signaling pathway, pi3k-akt signaling pathway, etc. Conclusions: This study preliminarily revealed the molecular mechanism of Fritillaria thunbergiiin the treatment of chronic bronchitis, laying a foundation for further experimental study on the basis of pharmacodynamic substances and mechanism of action.
Synthesis of Carbon-doped TiO2Nanotube Arrays and Their Application for Photocatalysis
Authors: Wang Xiaoyi , Liao Yulong , Johnson Michile
Published: April 2021

Carbon-doped TiO2Nanotube Arrays (CDTNAs) are synthesized via a facile method consists of electrochemical anodization and annealing in Ar atmosphere. Since the existence of residual ethylene glycol (EG) adhering to the walls of as-anodized TNAs, the EG can serve as carbon sources and subsequently avoids the employment of extrinsic carbon precursors. The properties of CDTNAs are investigated by X-ray diffraction (XRD), energy dispersive spectrometer (EDS), scanning electron microscope (SEM). Further, the photocatalytic performance of CDTNAs is significantly enhanced owing to the introduction of carbon. It is expected that the CDTNAs could be a promising candidate acting as an effective photocatalyst.
Study on typical defects and cracking characteristics of tool steel fabricated by laser 3D printing
Authors: Duan Chenghong , Zhao Minghuang , Luo Xiangpeng
Published: April 2021

Porosity and crack are the two most common types of metallurgical defects induced by SLM. It is of great significance to study the porosity and crack defects of H13 tool steel fabricated by SLM for promoting the practical application of this technology in the tool and die manufacturing industry. In this paper, the SLM experiments of H13 tool steel powder were carried out, and H13 tool steel samples were prepared. The microstructure of the as-fabricated samples was characterized by scanning electron microscope (SEM) and optical microscope (OM) to explore the characteristics and formation mechanism of porosity and crack defects in SLM process of H13 tool steel. It can be concluded that there are some metallurgical defects in as-fabricated H13 tool steel samples, such as lack of fusion or poor fusion, pores, and cracks. Most of the cracks are originated from the side edge of the sample, and some branched secondary cracks are induced near the coarse main cracks during the process of cracking along the formed layer to the inside of the sample. And the secondary cracks with small size could prevent the main cracks from continuing to propagate. Furthermore, due to the local stress concentration, some micro-cracks with smaller size are induced near the internal porosity defects.
Overview of Lower Extremity Exoskeleton Technology
Authors: Jiang Wei , Ma Baobo , Zhang Xinming , Liu Hui , Wang Zhanwen
Published: April 2021

The exoskeleton is wearable robot that can enhance the power of the wearer in various environments. The research goal of power-assist exoskeleton is to make it become more powerful, faster and more comfortable wearing experience. So far, some of the key technical problems are still not achieved practical breakthrough.
Preparation Technology of Water Based Detergent for Q235 Carbon Steel
Authors: Jia Wenqi , Zhen Ran , Liang Bo , Du Ye , Yang Kun , Zhang Ming , Liu Fei
Published: April 2021

Q235 carbon steel is smelted by a converter or open-hearth furnace. However, it is always speckled with oil in the manufacturing process influencing its use performance. In the paper, a water-based detergent, a variety of surfactants and additives, was used to remove the oil. First, the three remarkable surfactants were selected through single-factor experiment. Then, surfactants composition was obtained by simplex formula design. Finally, the optimum formula of metal cleaner was obtained by the uniform experimental design: FMEE 1%, MOA5 2.4%, 6501 2.6%, foam inhibitor 3%, antirust agent 2.4%+AES 2%+ carboxylic acid inhibitor 1.7%+copper corrosion inhibitor 2.1%+ detergent auxiliary 1.9%+water 80.9%. The cleaning efficiency can reach more than 98%.
Efficient Distortion Prediction of Laser Melting Deposited Industrial-scale Parts Using Modified Inherent Strain Method
Authors: Duan Chenghong , Cao Xiankun , Luo Xiangpeng
Published: April 2021

As a result of the large temperature gradients, residual distortion becomes a major technical challenge for laser powder-based Laser Melting Deposition (LMD) process, since excessive distortion may cause building failure, cracks and loss in structural integrity. In this paper, the theory of a modified inherent strain method is firstly developed. On the basic of this method, the prediction results of a small-scale model are compared with those obtained from the traditional thermo-mechanical coupled analysis. The deviation of the maximum distortion predicted by the modified inherent strain method is 7.72%, and the average deviation of the distortion of the substrate’s free end is 8.73%, demonstrating a good accuracy (< 10% error) of the modified method for predicting the residual distortion of the LMD components. Compared to a small loss of accuracy, the calculation time is significantly shortened by the modified inherent strain method. After verification, the distortion prediction of industrial-scale camshaft model during LMD process is realized by using the proposed method. It is found that the maximum distortion is 3.18mm, located at both sides of the camshaft. After the support is removed, the two ends of the camshaft are warped upward, while the position of the maximum distortion doesn’t change, but the value increased to 4.62mm. Moreover, the whole analysis takes only 3300 seconds, which is extremely significant for the distortion prediction for industrial-scale parts fabricated by LMD.
The Testing Method of Graphene Oxide (GO) and NAA Ramification
Authors: Hu Shuai , Xu Jiankang , Zheng Zheheng , Jia Yusheng , Fan Zheyong , Ozcan Arif
Published: April 2021

Organic/inorganic supramolecular system has been obtained by graphene oxide grafting with a-cyclodextrins (a-CDs) and NAA ramification. Tourer transform infrared spectra (FTIR), thermogravimetric analyse (TGA), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and X-ray photoelectron spectroscopy (XPS) were employed to identify the characters and morphology of the supramolecular structure. The features might make our supramolecular hybrid hydrogel a pretty candidate in a drug delivery system.
Frontier Analysis of the Application of New Materials in Competitive Sportswear
Authors: Sha Jin , Zhao Yongjun
Published: April 2021

Under the social background of national fitness, the sportswear industry has also developed rapidly. In order to improve the performance of sportswear, people have developed a series of new materials. Today, with the rapid development of textile materials, the use of high-tech materials can increase the added value of competitive sportswear. This paper briefly describes the new sports technical materials currently on the market, and classifies them according to design requirements, and discusses the application prospects of new materials in competitive sportswear. This paper proposes an intelligent phase change temperature control material; it is a new type of functional material, it is a product that combines phase change materials and textile weaving technology, it has two-way temperature control function, and this paper explores the application of this material competitive sportswear.
Study on production technology and surface morphology of carbon fiber
Authors: Zheng Xiongling , Li Chenyang , Zhang Qian , Wang Chen , Yue Qinchi
Published: April 2021

Since the 21st century, China’s carbon fiber industry has begun to develop rapidly. The research and development of carbon fiber is a major project related to national strategic security. Carbon fiber production technology has been mature, among which PAN based carbon fiber has the largest capacity. However, compared with the imported carbon fiber materials, there is still a certain gap in the performance of domestic carbon fiber materials. The purpose of this paper is to compare the properties of domestic carbon fiber and its composites. Firstly, the production process of carbon fiber is introduced, including monomer polymerization, spinning, oiling, preoxidation, carbonization, graphitization and other steps. Then, the T700 Carbon Fibers of Toray, Japan and two kinds of domestic T700 Carbon Fibers of Hengshen and Weihai were characterized and analyzed, and the surface morphology of three kinds of carbon fibers was compared. It is found that the domestic carbon fiber of Weihai adopts the similar technology of thousand spray wet spinning, and the fiber surface is smooth. However, Hengshen carbon fiber adopts the wet spinning process. There are grooves on the surface of the fiber, which will increase the mechanical meshing force between the fiber and the resin, and have a positive significance for the interface performance of the composite. However, it will increase the probability of fiber defects, such as fine lines, and have a negative impact on its tensile properties and other mechanical properties.
Optimization of headspace solid phase microextraction conditions and composition analysis of volatile constituents from Trifolium pratense L. leaves
Authors: He Chunlan , Zhou Ping , Zhang Gangping , Yang Zhao
Published: April 2021

Objective: To analyze the volatile constituents in the leaves of Trifolium pratense L. and to explore the effects of different factors on the extraction efficiency. Methods: The volatile components were extracted by the headspace solid phase microextraction (HS-SPME) method and analyzed by gas chromatography-mass spectrometry (GC-MS), and the relative content of the components was calculated by the area normalization method. Results: The best headspace solid phase microextraction conditions of the volatile components of the leaves of Trifolium pratense L. were as follows: 50 μm DVB/CAR/PDMS extraction head was used, the extraction temperature was 70 °C, and extraction time was 40min. 82 compounds were identified from Trifolium pratense L. leaves by GC-MS, accounting for 93.02% of the total volatile components, and the total peak area of volatile components was 2.31x109. The compounds with higher content and active activity were beta.-Caryophyllene (6.48%) and Naphthalene, decahydro-4a-methyl-1-methylene-7-(1-methylethenyl) (4.11%). Conclusion: The type of extraction head, the extraction temperature and the extraction time have great influence on the extraction effect. The HS-SPME-GC-MS method is suitable for the rapid extraction, separation and analysis of the volatile components of the leaves of Trifolium pratense L.
Study on the Crystal Structure and Genetic Structure of Eggshell
Authors: Liao Bing , Li Meiqi , Liu Yinan , Ning Zhonghua
Published: April 2021

Eggshell provides a relatively independent and stable internal environment for embryo growth and development, and is also a source of calcium ions required for embryo development. Eggshells of good quality can reduce the risk of food safety to a certain extent, and can also reduce the economic losses caused by broken eggshells and improve economic efficiency. At the same time, the process of eggshell formation is also a classic biomineralization model. In this study, the 600K high-density SNP chip of chicken was used to perform SNP typing on several groups obtained by the reciprocal cross between Bailaihang and Dongxiang green-shell hens. Scanning electron microscopy and X-ray crystal diffraction were used to determine the ultrastructure and eggshell ultrastructure. Crystal structure, explain its genetic basis, and explore the relationship between eggshell ultrastructure and crystal structure. This study believes that the DERA gene plays an important role in regulating the growth of eggshell crystals. There are three possible ways of action: one is to provide energy for the synthesis of uterine tissue cell matrix protein and its transport with ions; the second is to reduce the stress of high Ca2+ concentration stress, maintain cell activity, and for the growth of eggshell crystals Stably provide the required Ca2+; third, by regulating the concentration of ATP in the uterine fluid, the effect on the growth of eggshell crystals.
Application and Research of Analytical Chemistry Technology in Food Safety Testing
Authors: Kang Hongling , Liu Yinan , Hu Shuang , Liu Xin , Wang Man , Sun Wan , Chen Lihua , Yan Rong
Published: April 2021

Food safety problems occur frequently, and the food safety problems of major enterprises are continuously reported. Therefore, food safety quality and how to test food safety have become the focus of people’s attention. The technical testing of food safety is mainly achieved through chemical means, but with the continuous development of science and technology, the disadvantages of chemical testing technology continue to appear, so how to improve the chemical testing technology has become a difficult problem to be overcome in the technical field. The thesis focuses on various chemical technologies in food safety testing, such as electrochemical immunosensors, liquid chromatography detection, pigment rapid testing instruments, nucleic acid aptamers, etc., and selects several items for detailed description.
Simulation Experiment on Tunnel Lighting Aided by High Diffuse Reflectance Materials
Authors: Ren Yuhao , Su Minxin
Published: April 2021

The existing tunnel lighting calculation methods only consider the effect caused by direct light source and ignores the reflection effect of light flux emitted by lamps inside the tunnel closed pipe, which is not conducive to the energy saving and safety of tunnel lighting.In this paper, a tunnel illumination calculation method considering the reflection increment of tunnel sidewall is proposed. This method is based on the diffuse reflection coefficient of tunnel sidewall material which can characterize the reflection characteristic of its surface, so as to calculate the illuminance of road surface.Matlab software was used to simulate the real lighting environment of the tunnel with energy storage luminescent material as the side wall. It was found that the increase of reflection caused by high-quality tunnel interior materials could effectively improve the tunnel lighting
Antidepressant-Like Effect of Bupleurum Paeonia Liujunzi Decoction on Depression Model Mice and its mechanism
Authors: Xing Zhiyu , Liu Shengli , Xu Chang , Xiao Junke , Liu Jihong , Li Li , Gao Xiaoyao , Wang Zirui , Zheng Qingting , He Yuting , Lv Shaohui , Gao Chaopeng , Li Xiaobing
Published: April 2021

To investigate the behavioral effects and mechanisms of Bupleurum Paeonia Liujunzi Decoction (BPLD) in depression model mice. Twenty male Kunming mice were randomly divided into four groups: blank group, model group, fluoxetine group and Bupleurum Paeonia Liujunzi Decoums combined with reserpine gavage. Fluoxetine group were given fluoxetine treatment at 2mg/kg/d and Bupleurum Paeonia Liujunzi Decoctiction group. Depression model mice were induced by the chronic unpredictable mild stress (Con group were given BPLD treatment at 8g/kg/d. The model group and the blank group were given normal saline once a day. The experiment lasted for 7 days, during which the general state (body weight, hair color, etc.) was recorded and the changes were observed. The serum levels of norepinephrine (NE) and dopamine (DA) were detected by ELISA kit. Compared with the model group, the body weights of the diazepam group and the Chinese medicine group were significantly increased (P<0.01). In addition, it produced the concentrations of NE and DA in the serum were significantly increased (P<0.05) in the two groups. Bupleurum Paeonia Liujunzi Decoction has obvious therapeutic effect on depressed mice, and its mechanism may be related to the increase of NE and DA concentrations.
Study on desulfurized gypsum used as cement retarder
Authors: Zhou Jianmei
Published: April 2021

The effects of desulfurized gypsum, heat-treated desulfurized gypsum and hydrogen peroxide modified desulfurized gypsum on the setting time of Portland cement were studied. The results showed that when the content of desulfurized gypsum after 80 °C heat treatment was 4% of Portland cement, the initial setting time was 136min, and the final setting time was 196min, which met the requirements of cement. Compared with natural gypsum, the retarding effect of desulfurized gypsum on Portland cement is more significant at the same dosage. The desulfurized gypsum treated with hydrogen peroxide can improve the stability of cement. When the proportion of desulfurized gypsum and natural gypsum is 1:1 and the content is 3%, it has a better retarding effect on Portland cement.
The Atomic Structure of the Se-Passivated CuInSe2
Authors: Guo Yu , He Zhenni , Wang Yang , Yang Rui , Wang Junling , Ran JunChao
Published: April 2021

Through the first-principles calculations, we studied the atomic structure of Se-passivated CuInSe2. It is revealed that, the CuInSe2 can be passivated by selenium, under Se-rich condition, the structures with a full Se layer plus dimerized Se adatoms are favored. The formation energy of Se-terminated surface and the surface with Se overlayer are different, the formation energy of the surface with Se overlayer is more lower than the pure Se-terminated surface, that is to say, the surface with Se overlayer is more stable. On the other hand, the atomic structure of the Se-passivated CuInSe2 are also different from the atomic structure of the pure Se-terminated surface. Studying the structure of the Se-passivated CuInSe2 is very helpful for the high-efficiency solar cells.
Finite element analysis of stress concentration coefficient of internal pressure conical shell
Authors: Yuan Tong , Jin Zhaowen , Zhu Hongyu
Published: April 2021

Based on the analysis and design idea, we use the finite element method to evaluate the dangerous position of the conical shell opening structure, select the stress concentration coefficient of the opening as the research object, analyze the influence of different opening angle and with/withput a connecting pipe on it, and seeks the optimal design of the conical shell opening. The results show that the nozzle has a certain weakening effect on the stress concentration of the opening, and when the opening angle (the angle between the center line of the opening and the generatrix of the conical shell) is around 90° , the nozzle has a more significant strengthening effect on the structure. It also shows when the opening rate is fixed, the stress concentration coefficient of the opening decreases first and then increases with the increase of the opening angle, and when the opening angle is in the range of 80 ° to 110 ° , the stress concentration coefficient is the smallest between 2 to 3.
Microstructure and Properties of Laser Cladding Coating on the Surface of Superalloy Ti600
Authors: Jin Zhaowen , Wang Hong Bo , Yuan Tong
Published: April 2021

The laser cladding technology was used to prepare the Ti / TiB2 composite coating on the surface of Ti600, and the microstructure and performance test results of the coating obtained under different laser specific energy conditions were analyzed. Studies have shown that the laser cladding coating and the substrate have achieved a good bond, and TiB2 has formed into cellular TiB2 after melting, and further solid solution becomes a whisker structure. The diffused TiC and TiN nuclei in the middle of the coating were fully grown and developed a dense dendrite structure with TiB2 particles. A dual-phase structure of granular TiB2 and many lamellar structures was formed under the coating. When the laser specific energy is 20 kJ / cm2, the coating reaches the highest microhardness of 990HV, nearly 2.5 times the hardness of the substrate. The amount of wear shows a monotonic decrease with the increase of the specific energy of the laser, and the average friction coefficient shows a monotonous decrease as the specific energy of the laser increases.
Experimental Study on Fatigue Performance of High Strength Bolts of Rail Vehicles Under Axial Alternating Load
Authors: Tan Fuxing , Xuan Dongsheng , Zheng Zhiwei , Zhang Peng , Shen Hui
Published: April 2021

Lots of key parts of rail vehicles are connected by screw thread fastening. Therefore, it is very important to evaluate the service performance of bolt correctly and efficiently. Through the evaluation of the service performance of bolts, a series of engineering application problems of bolt connection can be well solved. In this paper, model building, theory checking, simulation analysis and bench test verification are studied in a unified way, so as to get the theory and research method of engineering application. According to the bench fatigue test, the 10.9 grade bolt was fractured after loading about 3 million times, so the bolt could not meet the life cycle requirement under this working condition.
Sol-Gel Method on the Preparation of Boron-doped Activated Alumina
Authors: Wang Shinuo , Liu He , Yuan Shuai , Fu Rong
Published: April 2021

In this paper, the crystal phase, pore structure, and surface properties of boron doping γ-alumina were investigated systematically, by the sol-gel method. The influence of the chemical environment and the modification mechanism of aluminium was explored in boron doping alumina. The samples were characterized by using XRD, N2 adsorption at low temperature, NH3-TPD, TEM, and NMR. The X-ray diffraction peaks of boria-alumina have no obvious change with the increasing content of boron, which still gives priority to the characteristic diffraction peaks of γ-Al2O3. Both the specific surface area of boria-alumina and pore volume diameter increase. The result of NMR indicates that boron alters the chemical environment of aluminium, then causes the difference in physical and chemical properties on the surface.
Clinical Overview of Prescription of Promoting Blood Circulation and removing blood stasis in Treating Diabetic Nephropathy
Authors: Wang Runxi , Tian Chunhong , Liu Yuexuan , Lou Qianye , Yang Mengjie , Si Guorui , Cai Ruijuan , Wang Ru , Cui Yangqing , Fang Yan , Wang Jing Huan , Xing Zhiyu , Zhang Huan , Li Xiaobing
Published: April 2021

Promoting blood circulation and removing blood stasis is an important method of clinical treatment of diabetic nephropathy (DN). Such prescriptions or compound prescriptions have a definite effect after long-term clinical practice. The Prescription of Promoting Blood Circulation and removing blood stasis (PBCRBS) reviewed in this article can improve glucose and lipid metabolism disorders, inhibit the changes in inflammation and promote blood flow of DN, reduce the burden on the kidneys, and delay the pathological changes of DN. This article summarizes the PBCRBS Clinical Overview of prescription in Treating Diabetic Nephropathy.