bluuebunny/crossref_metadata_2025_split huggingface dataset:
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

AbstractGraphene 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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

AbstractCarbon-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

Abstract
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.