bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Implementation of a Course Answering System Based on Error Correction and Trie Tree Language Model
Authors: Li Danyang , Zhao Yahui , Luo Mengjiang , Cui Rongyi
Published: September 2020

With the rapid growth of network information, the accuracy of input text affects the retrieval results, text proofreading technology emerges as the times require in order to avoid the situation of “wrong answers” caused by wrong questions when searching for information. In the course question answering system, we also need to consider the query speed and efficiency. In order to avoid the trouble of manual proofreading, this paper proposes a system which can automatically correct wrong questions in the professional field of curriculum. Firstly, used the edit distance method for fuzzy matching of error strings; then, used trie tree language model to store data to improve query efficiency. Finally, compared the proofreading effect under different text similarity thresholds, and selected the best value for the experiment. After experimental analysis and comparison, the best result is selected when the text similarity is 0.5, the accuracy rate is 77.91%, the recall rate is 67%, and the F value is 72.04%. Experiments show that the system designed in this paper can effectively correct the wrong text in the field of computer.
Function Design Optimization of Learning Management System (LMS) Based on Student Perspective—Case Study of Canvas Application University of Colorado Denver
Authors: Song Y N , Luan Z Q
Published: September 2020

As educational concept incorporates the computer science into the management methods, the innovative Learning Management Systems (LMS) have been extensively applied. This research is intended to ascertain the functional requirements derived in the course of LMS development by conducting the quantitative research of Canvas application (one of the representative LMSs) amidst the student users at the University of Colorado Denver. In light of the assessment of rationality and effectiveness towards current Canvas function settings, the findings reveal the predominant using purposes which include the integrated informational function, social networking function and customized learning function; and the study further indicate the practical recommendations in terms of the corresponding demands. The obtained results are supposed to be instrumental for the optimization and upgrade direction of LMS based on the purposes of improving learning motivation, learning efficiency, and learning outcomes.
Research on Cloud Platform Security Protection System for Power Plant
Authors: Yin Xinming , Guo Yi , Cao Zhiwei , Liu Han , Xiong Min
Published: September 2020

In the electric power industry, the information construction of IT systems is in an important period evolving to cloud computing technology and implementing digital transformation. The power cloud is a critical infrastructure for the digital construction in electric power companies. Cloud computing technology fundamentally introduces a flexible and dynamically allocated shared resource pool, and provides a way to share cloud resources different from traditional information systems, but it also brings new security risks and challenges. This paper analyses the security risks of the power cloud from the aspects of network security, host security, application security, data security, and management risks. The focus of research is on the construction of a security protection system for private cloud infrastructure in electric power companies. According to the business characteristics and important levels of business modules, the partition and domain protection design recommendations of the power cloud is proposed. An overall security protection architecture including three aspects of cloud platform self-security, cloud platform security services and cloud security operation management is presented. And specific key protection measures in the above three aspects are given, which has important guiding significance to electric power companies.
Interference Analysis Method Based on Link-Building Pattern in the Moving Non-geostationary Satellites
Authors: Yao Xiujuan , Gao Xiang , Zhi Jia , Yan Yi , Wang Jing
Published: September 2020

The frequency interference is becoming a serious problem because of the co-existence scenarios of Non-Geostationary orbit constellation systems. By studies the relative position of Non-Geostationary orbit satellites and ground stations, one interference analysis method was proposed to calculate the moving large amount satellites. This method classified the link-building status by logical operation between the interfering link and interfered link, constructed the link-building pattern, and optimized the calculation progress, thereby, improved the simulating efficiency. Considering the case of two single satellites like the flying DAMPE and HXMT satellites and two different constellation systems like the ITU-registered Oneweb and Telesat systems, a simulation scenario was established. The experiment results showed that this proposed method can improve the simulation efficiency higher than the full link simulation. That can be an adaptive technology for the interference calculation analysis of the Non-Geostationary orbit systems no more than 2000 satellites.
Design of a Narrowband Adaptable Filter in Low-Frequency Domain
Authors: Mao Weiwei , Gao Wei , Zhang Zhiguo , Jin Xiaoyu , Zhu Ru
Published: September 2020

To improve the Signal to Noise Ratio and the precision of data acquisition systems in the condition of broad bandwidth, an adaptive narrow-band filter circuit has been designed for obtaining weak signals in low-frequency domain. And the problems of classic filter circuits, such as wave form distortion and suffering from non-linearity of varactors, can be solved by the novel design in replacing varactor with voltage control capacitor. Simultaneously, by improving LRC filter circuit, our designs also can increase quality factor in traditional RC filter circuit. Therefore, this design has great advantages over classic filter circuits for its narrow frequency band, high quality factor and low signal deformation. The above properties of this circuit can make it used widely in removing noise for modulation and acquisition circuits with high precision, and can be used to obtain accurate band-pass filtering in low frequency bands, which has been verified by experiments showing superior advantages of improving the SNR and filtering effects.
Speech Dereverberation Based on Improved Wasserstein Generative Adversarial Networks
Authors: Rao Lufang , Yang Junmei
Published: September 2020

In reality, the sound we hear is not only disturbed by noise, but also the reverberant, whose effects are rarely taken into account. Recently, deep learning has shown great advantages in speech signal processing. But among the existing dereverberation approaches, very few methods apply deep learning at the waveform level. In addition, in the case of sever reverberation, the conventional speech dereverberation methods perform poorly, such as MCLP (multi-channel linear prediction). We proposed a new speech dereverberation method in this paper, which is based on improved WGAN (Wasserstein Generative Adversarial Networks), called WGAN-GP, whose generator uses strided-convolutional networks and the discriminator is structured on DNNs. Due to the addition of the gradient penalty item, WGAN-GP improves the stability of training and the generalization of the model. In the case of severe reverberation, according to the experimental results, the proposed system can perform better than MCLP. As the proposed method based on WAGN-GP can improve speech quality, speech signal processing systems may be able to apply it to pre-processing stage.
Encounter Delivery Strategy for Strongly Relational Relay Nodes in MSN
Authors: Zhang Zhiyu , Liu Bin , Xue Maojie
Published: September 2020

MSN has the characteristics of social network, and the nodes under intellectual consideration show social selfishness, which is characterized by kinship index. We propose an encounter delivery strategy based on strong-relationship relay nodes. Firstly, in the hierarchical communities and clusters based on the kinship index, the active strong relationship node set is obtained through the open strong relationship priority algorithm and Markov prediction. Then establish a kinship trust model, conduct behavior detection on active strong relationship nodes to obtain a comprehensive kinship trust value, and then screen out some of the “false kinship” nodes to screen out a set of trusted active strong relationship nodes. Finally, according to the kinship indication with the destination node, the node’s kinship movement behavior is predicted, and the candidate relay node set is selected. Simulation experiment results show that this strategy can improve the reliability of message transmission, reduce network delay, and improve the efficiency of data packet transmission to a certain extent.
A Social Governance Scheme Based on Blockchain
Authors: Wang Qianwen , Geng Fang , Zhang Pan , Chen Yibo , He Li , Cheng Sijin
Published: September 2020

Blockchain technology has the characteristics of distributedness, transparency, traceability, and openness. It is suitable for promoting the flatness of social governance structure and the transparency of governance and service processes, thereby improving the security of government social governance data, and promoting intelligent governance and Trustworthy government building. Blockchain combined with big data and artificial intelligence, cutting-edge technology, based on the principles of security, reliability, tamper resistance, anti-counterfeiting, and traceability, a new model of “blockchain + social governance” will be established. This article constructs a social governance scheme based on blockchain, the purpose of which is to solve problems in various areas of existing social governance with the help of the technical advantages of blockchain.
Research on the Construction of Cultural Tourism Market in Shenyang Based on Big Data
Authors: Xu Jiashu
Published: September 2020

In 2013, General secretary Xi Jinping proposed the strategic conception of building “the new Silk Road Economic Belt” and “the maritime Silk Road in twenty-first Century”. As the core city one belt, one road and one road in Shenyang will play a decisive role. This paper focuses on the construction background of “One Belt, One Road”, explores the development of Shenyang cultural tourism market under the background of “Belt and Road”. The article studies the development status of Shenyang cultural tourism market, and then analyzes the development and construction of Shenyang cultural tourism market “One Belt One Road”. The main research method of this paper is big data analysis. Combined with a large number of data, this paper makes a consumer portrait of Shenyang cultural tourism market, aiming to study the regional tourism consumer behavior. This paper gives Construction and research to provide advice and suggestions for regional economic development.
An Automatic Question Answering Method for Small-Scale Corpus
Authors: Shao Yikang , Xu Guangde , Xu Mingxue , Dong Lanfang
Published: September 2020

It is a growing trend for automatic question answering system to be prominent in the development process of society. There are many methods trying to address this problem, but with deficiencies—relatively developed methods based on template matching need a lot of manual work writing templates, and machine learning based methods need plenty of work collecting a large number of corpus, bring huge burden on small-scale scenery. Facing these problems, we propose an automatic question answering methods meeting the needs of small-scale corpus. This method consists of combining an improved text similarity calculation algorithm and an intention recognition method based on slot filling. We conduct experiments on the problem sets of related fields, and it shows a good performance of the proposed automatic question answering method. Our methods make small scene applications for dialog systems more practical.
ML-assisted versatile approach to Calorimeter R&D
Authors: Boldyrev A. , Derkach D. , Ratnikov F. , Shevelev A.
Published: September 2020

Advanced detector R&D for both new and ongoing experiments in HEP requires performing computationally intensive and detailed simulations as part of the detector-design optimisation process. We propose a versatile approach to this task that is based on machine learning and can substitute the most computationally intensive steps of the process while retaining the GEANT4 accuracy to details. The approach covers entire detector representation from the event generation to the evaluation of the physics performance. The approach allows the use of arbitrary modules arrangement, different signal and background conditions, tunable reconstruction algorithms, and desired physics performance metrics. While combined with properties of detector and electronics prototypes obtained from beam tests, the approach becomes even more versatile. We focus on the Phase II Upgrade of the LHCb Calorimeter under the requirements on operation at high luminosity. We discuss the general design of the approach and particular estimations, including spatial and energy resolution for the future LHCb Calorimeter setup at different pile-up conditions.
Crosslinking strategies for silk fibroin hydrogels: promising biomedical materials
Authors: Farokhi Maryam , Aleemardani Mina , Solouk Atefeh , Mirzadeh Hamid , Teuschl Andreas Herbert , Redl Heinz
Published: September 2020

Due to their strong biomimetic potential, silk fibroin (SF) hydrogels are impressive candidates for tissue engineering, due to their tunable mechanical properties, biocompatibility, low immunotoxicity, controllable biodegradability, and a remarkable capacity for biomaterial modification and the realization of a specific molecular structure. The fundamental chemical and physical structure of SF allows its structure to be altered using various crosslinking strategies. The established crosslinking methods enable the formation of three-dimensional (3D) networks under physiological conditions. There are different chemical and physical crosslinking mechanisms available for the generation of SF hydrogels (SFHs). These methods, either chemical or physical, change the structure of SF and improve its mechanical stability, although each method has its advantages and disadvantages. While chemical crosslinking agents guarantee the mechanical strength of SFH through the generation of covalent bonds, they could cause some toxicity, and their usage is not compatible with a cell-friendly technology. On the other hand, physical crosslinking approaches have been implemented in the absence of chemical solvents by the induction of β-sheet conformation in the SF structure. Unfortunately, it is not easy to control the shape and properties of SFHs when using this method. The current review discusses the different crosslinking mechanisms of SFH in detail, in order to support the development of engineered SFHs for biomedical applications.
Overlooked organic vapor emissions from thawing Arctic permafrost
Authors: Li Haiyan , Väliranta Minna , Mäki Mari , Kohl Lukas , Sannel A Britta K , Pumpanen Jukka , Koskinen Markku , Bäck Jaana , Bianchi Federico
Published: September 2020

Volatile organic compounds (VOCs) play an essential role in climate change and air pollution by modulating tropospheric oxidation capacity and providing precursors for ozone and aerosol formation. Arctic permafrost buries large quantities of frozen soil carbon, which could be released as VOCs with permafrost thawing or collapsing as a consequence of global warming. However, due to the lack of reported studies in this field and the limited capability of the conventional measurement techniques, it is poorly understood how much VOCs could be emitted from thawing permafrost and the chemical speciation of the released VOCs. Here we apply a Vocus proton-transfer-reaction time-of-flight mass spectrometer (PTR-TOF) in laboratory incubations for the first time to examine the release of VOCs from thawing permafrost peatland soils sampled from Finnish Lapland. The warming-induced rapid VOC emissions from the thawing soils were mainly attributed to the direct release of old, trapped gases from the permafrost. The average VOC fluxes from thawing permafrost were four times as high as those from the active layer (the top layer of soil in permafrost terrain). The emissions of less volatile compounds, i.e. sesquiterpenes and diterpenes, increased substantially with rising temperatures. Results in this study demonstrate the potential for substantive VOC releases from thawing permafrost. We anticipate that future global warming could stimulate VOC emissions from the Arctic permafrost, which may significantly influence the Arctic atmospheric chemistry and climate change.
Study on the characteristics of gas-generating reservoir-caprock assemblages and gas traps in coal measures in Fuxin Basin
Authors: Song Kailin , Yao Lei
Published: September 2020

As an unconventional natural gas reservoir, sand body gas has unique characteristics. The paper takes Fuxin Basin as the research object and carries out systematic research on the characteristics of sand gas generation reservoir cap combination. The main controlling factors are analyzed for the trap characteristics of the sand gas reservoir in the main formation. The results show that there are two types of gas source rocks in Fuxin Basin, namely, dispersed organic matter and concentrated organic matter reservoirs, which are mainly composed of two sets of strata. The first set is the lower channel sand bodies of the Fuxin Formation, and the second set is the third member of Shahejie Formation, The second alluvial fan-fan delta sand body. The caprock of Fuxin Formation is mudstone and siltstone in the middle and upper part of this group. The cover layer of Shahai Formation is mudstone and siltstone in the fourth member of Shahe Formation, with dense and uniform development in the whole area and stable sedimentation. Sand gas traps in Fuxin Basin are mainly controlled by two types of traps: structural traps and lithologic traps.
Application of Stress Analysis Software in Oil and Gas Pipeline
Authors: Li Bowen , Li Xinhang , Miao Yubin , Yang Hao
Published: September 2020

With the rapid development of China’s national economy, the development of the petrochemical industry is particularly rapid, high-temperature and high-pressure pipelines are widely used in the oil and gas storage and operation industries. The design level becomes the key to measuring whether a design unit can win in the fierce market competition, and one of the core technologies is the stress analysis of the pressure pipeline. CAESAR II pipeline stress analysis software is more popular in the international one of pipe stress analysis software. Its data input is simple and the graphic display is intuitive, which is easy for beginners to master, but also has a strong engineering practicality. This article will discuss the advantages and problems of CAESARII stress analysis software in practical applications, and use examples to perform relevant analysis.
Optimizing coal burning caused by coal breaking in recirculating vulcanization bed unit based on fuel control strategy
Authors: Fang Zhang , Li Zhang
Published: September 2020

Recirculating fluidized bed has high efficiency, low pollution and good coal adaptability. It can burn all kinds of quality fuels, such as peat, bituminous coal (including high sulfur coal), anthracite, gangue, coke, industrial waste, municipal waste, etc. Direct addition of desulfurizer such as limestone in the bed results in small investment and high desulfurization efficiency. International and domestic circulating vulcanization bed has entered the stage of large-scale and commercial production. Recirculating fluidized bed combustion is a new technology. The burning mode of special coal in boiler structure is essentially different from that of pulverized coal furnace. There is a certain gap in domestic installation technology compared with pulverized coal furnace. It is easy to cause coal cut-off in operation of circulating fluidized bed forming unit. The occurrence of coal cut-off is easy to cause bias burning and unbalanced combustion of boiler. In serious cases, MFT action of boiler will be triggered. Therefore, it is necessary to optimize the existing fuel control strategy to prevent coal burning caused by coal breaking in the circulating vulcanization bed unit.
Safety Assessment of High Holtage Transmission Foundation in Goaf of Coal Mine
Authors: He Nainan , Hu Dingkang , Gao Jingxuan
Published: September 2020

Coal mine goaf is a poor construction site with hidden, complex, large surface deformation range and easy to cause geological disasters, which is very harmful to the construction of ground engineering. Therefore, the stability of the goaf site is a prerequisite for the stability of the structure and should be evaluated before construction. Based on the topic of “stability evaluation of the goaf base of 330kV shen-dang I and II line connecting jinjie transformer transmission line project”, this paper conducts a special investigation and evaluation of the transmission line through jinjie coal mine goaf in shenmu city. In the huge collection of the mining area of the regional geological and mineral constructed over the report, the coal geological exploration and mining design, on the basis of such information to goaf Kentucky lines (C14~C17) actual investigation, geological survey, engineering survey, engineering geophysical exploration (tem), find out the preliminary Kentucky goaf site engineering geological condition, hydrogeological condition, the coal mined-out area distribution and its characteristics, etc. The stability of the ground foundation site was qualitatively evaluated by the mining condition discriminant method (taking the mined-out area final mining time, roof lithology and the thickness of loose bed as factors), and the evaluation results showed that the site was in a basically stable state. Secondly, the numerical analysis method was used to calculate and analyze the surface movement and deformation of the mined-out area of the base. The stability of the mined-out area of the base was evaluated quantitatively. The results showed that the mined-out area of the base was in a basically stable state, which was consistent with the qualitative judgment. The research results have some reference value for other surface engineering construction and geological disaster prevention in jinjie coal mine of shenmu city.
Research and Application of Flocculant for Oilfield Wastewater Treatment Based on Fracturing Wastewater
Authors: Song Chunyan , Zhao Jingang , Huang Shan , Wang Xiaohui , Li Li , Meng Zhaoyu , Chen Chao
Published: September 2020

In view of the characteristics of high viscosity, high turbidity and high oil content in the oilfield fracturing operation wastewater, the Fenton oxidation-flocculation treatment method is used to reinject the fracturing wastewater, and the pH value, Fenton reagent and flocculation of the wastewater The dosage of agent and the time interval of adding flocculant to the effect of fracturing wastewater oxidation and flocculation treatment. The results show that: according to the conditions of 30% hydrogen peroxide (volume percentage) dosage of 0.2% and FeSO4 dosage of 20mg / L Fenton oxidation was carried out for 30min, and then flocculation treatment was carried out under the conditions of PAC dosage of 70mg / L, PAM dosage of 3mg / L, and stirring speed of 100r / min for 30min, then into the SBR reactor for 8h aeration and sedimentation for 1h, then treated The COD of post-fracturing wastewater decreased from 4132.92mg / L to 190.38mg / L, and its removal rate could reach 95.4%. The combined process has far better treatment effect on wastewater than the single micro-electrolysis, Fenton oxidation or flocculation process, and the method is simple and easy to use, and the utilization rate of the agent is high.
Development and Application of Petroleum Development Equipment Integrity Management System Based on Wireless Sensor
Authors: Fan Lu , Zhang Xiaohan , Yue Yu
Published: September 2020

This paper designs and implements a large-scale instrument and equipment monitoring system from the perspective of the current management of large-scale instruments and equipment for petroleum development. The system is interoperable with the current petroleum extraction equipment management system and the large life cycle management system of large-scale instruments and equipment, combined with wireless sensor network technology, real-time monitoring of large-scale equipment. The system facilitates the management of large instruments and equipment by large instrument and equipment management departments and improves the efficiency of petroleum development equipment management.
Comprehensive prevention and control of coal and gas outburst in south second well of Liziya coal mine
Authors: Wang Bo
Published: September 2020

Based on the analysis of the present situation and existing problems of coal and gas outburst in the second South well of Liziya coal mine, and adhering to the concept of comprehensive gas control, the field test and design of the main mining K1 coal seam are carried out respectively from the outburst prevention prediction sensitive index and critical value, regional outburst prevention measures, hydraulic fracturing permeability enhancement measures and local outburst prevention measures. The critical value of outburst prevention prediction sensitive index in the test area is: k1m = 0.40 Ml / g · Min1 / 2, Sm = 4.3kg/m; in the production area, the bottom rock pre drainage tunnel through layer drilling pre drainage, the coal tunnel through layer strip pre drainage, the double tunnel layout drilling pre drainage are used to improve the gas drainage rate by hydraulic fracturing and permeability enhancement measures, fundamentally eliminate the risk of coal and gas outburst, and realize the safe production of the mine.
Experimental study on the gas desorption law of lump coal in coal mine goaf
Authors: Dai Linchao
Published: September 2020

In order to accurately predict the coal mine goaf gas emission and evaluate the goaf gas resources, a self-designed atmospheric pressure coal desorption measurement device was used to conduct a long-term (lasting 140 days) gas desorption rule experiment of goaf lump coal, the effect of lump coal size on gas desorption law was analyzed. The research results show that the desorption rate of lump coals of different sizes (3cm, 5cm, 8cm, 13cm) has a negative exponential function relationship with time. And the cumulative amount of gas desorption basically increases with the increase of lump coal size, the initial gas desorption rate basically increases with the increase of the lump coal size.
Optimized design of new composite drill
Authors: Bai Zongxi
Published: September 2020

In drilling engineering, the timeliness of the drill bit is very important, which affects the drilling speed and drilling cost. This paper starts from the rock breaking mechanism of the drill bit and the feedback of on-site construction, and analyzes the relative position of the composite drill bit PDC blade-roller For the impact of mechanical drilling speed and load distribution, a new type of composite drill bit was optimized and designed to form a two-level cutting composite drill bit. The new composite drill is designed for two-stage cutting mode. The stepped wellbore after two-stage cutting produces an equivalent steering angle, which can effectively reduce local head loss. The new composite drill bit can increase the mechanical drilling speed, reduce the cost of oil and gas extraction, and adapt to the future drilling dynamic needs.
Structural characteristics and prospecting direction of coal-based graphite deposits in Feng county area, China
Authors: Wei Yunxun , Lv Lushi , Li Congcong
Published: September 2020

The Fengxian coal-based graphite deposit in Shaanxi province is located in the southern western section of the Northern Qinling Massif in Shaanxi Province and is an important graphite metallogenic belt in the Qinling massif. The results show that the main structural styles of the graphite deposit in Fengxian county, Shaanxi province are “S” - type folds, nappe structure and superimposed fold. After mineralization, it has experienced at least two strong tectonic movements. In the early stage, the compressive stress is dominated by near-NS direction, while in the later stage, the compressive stress is dominated by NWW direction, which is superimposed with the near-East-west fold. Combined with the characteristics of structural ore control, it is found that the focus of ore prospecting in the study area lies in the 5th and 6th strata of Caoliangyi Formation, east of Laochang.
Application of controlled blasting technology in mountain excavation under complex conditions
Authors: Qiao Wei
Published: September 2020

The blasting conditions of the site leveling project of a green power and renewable energy limited company are extremely complex. There are construction facilities on both sides of the excavated hill, and expressways and county roads on the front of the excavated hill. In order to control the impact of rolling stones, blasting vibration, blasting flying stones on surrounding buildings, bridges and culverts, pre-embedded industrial water pipes, highways and roadbeds during the excavation of mountain bodies, precise controlled blasting and comprehensive vibration reduction techniques such as weak loosening, controlling the maximum single-shot (single-segment) charge, hole-by-hole blasting, dispersed charge sectional blasting, axial spacing and radial uncoupled charge are proposed. Pre-splitting blasting technology is used to stabilize the slope in slope engineering and trench blasting technology is used in excavation of cut-off ditch. The technology guarantees the normal opening of the frontal expressway and county road during the excavation operation, and does not affect the safe production of the company. This technology guarantees that the excavation of mountain body will not affect the normal opening of frontal expressway and county road, and will not affect the safety of production of the company.
Analysis on the effect of comprehensive adjustments measures for the Second Type Reservoir in the Eastern Block of Beierxi
Authors: Yan Pei
Published: September 2020

The second type reservoirs in the Eastern Block of Beierxi were put into production in December 2005 and October 2009. The block, a total of three production stages: the first stage (September 2009 - January 2015) for the production of initial water flooding production stage, perforated SII1- SII15+16 reservoir groups, and product some series adjustments in November 2014, blocking SII1-9 reservoir group, opening SIII reservoir group; The second stage (From January 1, 2015 to May 8, 2015) is the pre-slug stage of polymer injection; The third stage (From May 8, 2015 to the present stage) is the ternary main slug stage, entering the effective period. This article based on the fine reservoir geological characteristics of anatomy, using fine geologic research results, combined with the notes in the process of ternary dynamic reflection, and we also targeted comprehensive measures in order to adjust the work, control water cut increase rate, improve the block effect situation, and ultimately maximize recovery.
Design and Experimental Research of the Inbuilt Oil Collection System for the Oil Spill Recovery Ship
Authors: Zou Yunfei , Zhang Panpan , Zhang Dewen , He Rui
Published: September 2020

The inbuilt oil collection system of the oil spill recovery ship is based on the principle of downward belt skimmer. The system adopts a composite structure, which is integrated with the downward belt skimmer and the upward belt device. The skimmer is used for oil recovery and the upward conveyor belt device is used for rubbish disposal. In this paper, experiments in the test hull and test pool were carried out to investigate the performance of the inbuilt oil collection system such as the recovery rate, the recovery efficiency and the waste adaptability. The test results show that the oil spill recovery system has the advantages of compact structure, high recovery rate and efficiency, high adaptability of garbage, high safety of operation and so on.
Research on the Sulfate-resistant Chemical Attack Mechanism of Concrete with Mineral Admixture
Authors: Yang Zhuo , Huang Yineng , Zhu Lie , Liu Tong , Xu Pan , Hou Zhenkun
Published: September 2020

Durability is the most important factor for evaluating the service life of concrete, and the chemical attack of sulfate is an important factor affecting the durability of concrete. In this paper, fly ash, slag, metakaolin and silica fume were used as mineral admixtures to explore their impact on sulfate chemical attack, and the chemical attack mechanism of sulphate was deeply analyzed, the results showed that: the incorporation of fly ash, slag, and silica fume effectively improves the sulfate-resistant chemical attack capacity of concrete. The concrete was chemically attacked 30d in sulfate solution, which will increased its compressive strength and quality, it was mainly due to the secondary hydration reaction of fly ash and slag, part Ca (OH)2 reacted with Na2SO4 solution to generate gypsum and ettringite, and made the internal structure of concrete more compact. As the age of sulfate chemical attack increases, the ettringite expands with water, and causes concrete to be expanded or peeled. Silica fume mainly provides more active SiO2 for the secondary hydration reaction, consumes more Ca (OH)2, and reduces the formation of ettringite.
Development Status and Technical and Economic Analysis of Ethanol Gasoline for Automobile in China
Authors: Li Zhenhua , Hu Xiaoting , Zhang Qingqing
Published: September 2020

With the shortage of petroleum resources and the aggravation of environmental pollution, the research of alternative fuel for automobile is paid more and more attention. As a relatively clean fuel, ethanol gasoline can significantly reduce the emission of harmful substances in automobile exhaust. Compared with ordinary gasoline, it has the advantages of high octane number, good antiknock performance and high oxygen content. But it also has disadvantages such as low combustion heat value, large latent heat of evaporation, corrosion to metals, poor and compatibility with some engine materials, etc. The three factors affecting the development of ethanol gasoline are resources, technology and economic benefits. Although China is the third largest ethanol production and consumption country in the world, its resource conditions are not as good as those of the United States and Brazil. Under the current market and industrial policy environment, the overall benefits of domestic fuel ethanol production enterprises are poor. Cellulosic ethanol technology is the key technology to restrict the development of ethanol gasoline. Only when the second generation of biofuels pass the economic test, can the use of ethanol gasoline be promoted nationwide.
Monitoring dynamic deformation of communication tower using photography dynamic monitoring system
Authors: Ge Yongquan , Yu Chengxin , Liu Xiaodong , Wang Ronghui
Published: September 2020

With the advent of next-generation cellular mobile communication technology, the world ushered in a new communications tower construction boom to protect the safe operation of the communication towers without delay. In this paper, we monitored the dynamic deformation of the communication tower using the PDMS (photography dynamic monitoring system). Results showed that the tower is integrity and stability; The deformation is conform to the China national standard. The PDMS can monitor the tower in a non-contact, it has a characteristic of strong robustness, excellent flexibility and low cost.
Study on the co-mining mode of coal and gas in protective layer of coal seam group
Authors: Yuan Benqing
Published: September 2020

In view of the occurrence conditions of coal seam groups in most mining areas in China, the protective layer mining mode is mainly adopted to carry out gas treatment in regional coal seam. In this paper, based on the pressure relief mining of the protective layer, the principle, type and geological conditions of the co-mining mode of the protective layer coal and gas under the condition of coal seam group are analyzed.
Study on the Performance of Fiber-Latex-Calcium Carbonate Whisker Gas Storage Cement
Authors: Wang Yu , Zhang Jingfu , Jin Chunyu , Chen Xun
Published: September 2020

A cement slurry system was designed and optimized in order to meet the strict operation and production requirements of the gas storage well cementing. System formula was G cement +1.5% filtrate reducer +1% dispersant +0.5% defoamer +10% calcium carbonate whisker +8% polychloroprene latex +0.08% polypropylene fiber +0.09%PVA fiber + water. Evaluation experiments showed that the engineering properties of cement slurry system were well, such as good rheology, low water loss, no free liquid, wide adjusted range of thickening time, good anti channeling ability and good suspension stability. The experiment results of cement mechanical strength showed that the 7 days tensile strength of the cement specimen was increased 62.3% higher than that of the neat cement grout, while the 7 days compressive strength was increased 47% and the elastic modulus was reduced 41.7% compared to the standard peak. The micro-structure and morphology of gas storage cement specimens were observed and the mechanism of cement strength enhanced by fiber, latex and calcium carbonate whisker were studied that fiber and calcium carbonate whisker bridged the cracks, reduced cracked tip stress concentration, effectively prevented the development and diffusion of cracks, enhanced cement deformability and reduced the elastic modulus; polychloroprene latex formed latex film on the surface of cement particles and fiber, which improved the cementing strength and the interface micro-structure between fiber and cement, reduced the stress concentration caused by mutant materials, improve the toughness of cement stone greatly.
Study on geothermal genesis in Juxian area, Shandong Province
Authors: Yang Huisan , Sun Yunchuan , Jiang Tianqi
Published: September 2020

In order to explore and develop geothermal resources in Juxian area, Shandong Province has studied the causes of geothermal in Juxian area. On the basis of field investigation, drilling and logging, and water quality inspection in Juxian area, the metallogenic conditions were analyzed from the aspects of geothermal source, geothermal storage, caprock, and geothermal channel formed by geothermal water, and finally the geothermal causes in Juxian area. The surface water and atmospheric precipitation in the study area infiltrated through the fault near the Yishu fault, and after 3,150 m deep circulation, the heat was obtained by the normal geothermal heating method, while dissolving the mineral components in the surrounding rock, and finally gathered in the Qingshan Group andesite, It forms high-quality hot mineral water rich in minerals such as fluorine, strontium, lithium, metaboric acid and metasilicic acid. The andesite caprocks of the Qingshan Group effectively hindered the loss of the geothermal water and heat energy of the geothermal water gathered here. The geothermal water enters the geothermal well through faults and strata dissolution holes, and surges up to the surface.
Analysis and optimization of hemispherical gable reconstruction scheme for old coal shed
Authors: Yang Chenguang
Published: September 2020

Nowadays, many old dry coal sheds are able to meet the structural safety requirements. However, due to the high requirements of environmental indicators in recent years, the open coal shed on both sides is unable to meet the environmental protection specifications. Aiming at the further closed design of the old dry coal shed, the design scheme is adopted, and the transformation scheme of the hemispherical gable wall is adopted, and the parameter optimization is carried out, which can be used for reference in the future design. And a wide range of promotion and implementation.
Study on the integrated system of prediction of the range of volcanic collapse in Changbai Mountain
Authors: Li Chengyang , Lang Qiuling , Zhang Fengshun , Zhao Dekun , Liu Honglin , Zhou Jun
Published: September 2020

In view of the large amount of geological data, dispersion and the lack of time-consuming and error-prone and other routine statistics, the scope of volcanic collapse in Changbai Mountain area is comprehensively calculated. Analysis of relevant impact factors, such as rock, slope height, slope, human factors, etc. Using UDEC to simulate collapse and then use SPSS software to predict the range of influence and to carry out linear regression. Then analyze its correlation and discreteness, draw the linear regression equation, establish the prediction system of the range of the volcano collapse of Changbai Mountain, and reach the database management and scope.
Influence of Topographical Factors on Spatial Distribution Characteristics of Soil Nutrients in Qinba Mountain Area
Authors: Hua Dongwen , Li Juan , Xu Yan
Published: September 2020

To study the spatial distribution characteristics of soil nutrients in different micro-topography and their correlation with topographic factors, to provide reference basis for soil resource nutrient management and ecological environment construction in other areas with the same topography. This paper is based on 150 soil samples from 3 main tea-producing areas in Shangnan County, and analysis methods such as sampling analysis of variance and correlation analysis are applied to soil organic matter, total nitrogen, available potassium, and available effects under different micro-topography (slope, aspect, and slope position). The spatial distribution characteristics of phosphorus were analyzed and the correlation between soil nutrients and topographic factors was explored. The results showed that the contents of soil organic matter, total nitrogen, available phosphorus and available potassium in the surface layer (0-10cm) of the study area were significantly higher than those in the middle and lower layers of soil, all of which were of moderate intensity variation. Soil total nitrogen, available potassium, available phosphorus and organic matter content are affected to some extent by slope, aspect and slope position. In general, soil total nitrogen, organic matter content and slope position are significantly negatively correlated (P <0.05), and the slope direction showed a very significant positive correlation (P <0.01), while the soil available potassium and available phosphorus had a negative correlation with the slope position and slope (P <0.05).
Research on Disaster Prevention Technology of Remote Sensing Image Segmentation of Ocean Big Data Platform Based on Internet of Things
Authors: Zhang Ying , Lu Kai
Published: September 2020

In order to further improve the ability of disaster prevention and mitigation informatization, this article starts from the idea of comprehensive planning and construction, draws on the physiological principles of modern division of labor, and clearly coordinates the various components of the Internet of Things. The Internet of Things, big data, artificial intelligence and other information technologies, based on the Internet of Things-based ocean big data platform remote sensing image segmentation disaster prevention technology research theory, proposed a smart marine engineering construction plan, from the construction of the marine environment 3D monitoring system Ocean construction data platform, development of marine application systems, information standards and specifications, plan design and many other aspects. The platform’s remote sensing image segmentation disaster prevention technology covers marine environmental protection, disaster prevention and mitigation, islands, marine law enforcement, marine economy, marine fisheries and many other commercial fields. The research results have been practiced in the construction of smart oceans in many coastal provinces and cities in China, and have important reference significance for the construction of smart oceans in other coastal provinces and cities.
Analysis and Application of Shock Absorption Measures for High-rise Inpatient Building of a Hospital in High Intensity Fortification Area
Authors: Luo Fajiang , Li Peng , Meng Zhaohu , Li Yong , Han Guangzhao , Xuan Du , Lin Zhijun , Liu Yuhong
Published: September 2020

A proposed 22-storey hospital building is located in an area with 8-degree seismic fortification and is a reinforced concrete frame-shear wall structure. Through the establishment of structural model, calculation and comparative analysis are carried out by using ETBAS and PERFORM-3D software. The viscous damping wall is used for energy dissipation and damping, and the optimal damping scheme is determined by multi round time history analysis and optimal adjustment of the number and location of dampers.
Analysis of Pit Corner Effect of Special-shaped Foundation Pit of Subway Station
Authors: Tan Junbin , Zheng Xiangyi , Sun Yang , Shao Guojian , Chen Yubo
Published: September 2020

Based on the deep foundation pit project of Maluan North Station of Xiamen Metro Line 2, a large number of monitoring points were set up to monitor the foundation pit in order to study the deformation law and the pit corner effect during the excavation of the special-shaped foundation pit. By analyzing on-site monitoring data and numerically simulating the excavation of special-shaped foundation pits, this study found that the lateral deformation of diaphragm wall and ground settlement at the corner of the pit all exhibited obvious pit corner effect. The maximum lateral displacement of the long-side diaphragm wall is slightly larger than that of the short-side diaphragm wall. The maximum ground settlement at the corner of the pit is less than the maximum ground settlement behind diaphragm wall. Moreover, the differential ground settlement around the pit corner is obvious.
Effects of Amendment on Soil Nutrients in the Root Zone of Replanted Soil in Homestead
Authors: Zhang RuiQing , Li Gang , Wang Ying , Yao SiSi
Published: September 2020

In order to improve the soil nutrients of replanted soil in homestead, find the best soil improvement model. The plot experiment was used to study the effects of six amendments addition modes on soil nutrients in the root zone of replanted soil in homestead. The results show: Result 1 organic fertilizer (T2) treatment on organic matter The improvement effect is the best, the average increase is 9.37~15.49 g kg−1, followed by fly ash+organic fertilizer (T5); Result 2 the improvement agent + organic fertilizer (T4) had the best effect on the available phosphorus in the tillage layer, which was 11.95~19.18 mg kg−1 compared with the no fertilization measures; Result 3 fly ash + organic fertilizer (T5) treatment had the best overall effect on the improvement of available potassium and total nitrogen in the tillage layer, compared with the no fertilization measures increase of 31.6~34.8 mg kg−1 and 0.05~0.25 g kg−1. Organic fertilizer and fly ash can be used as the most suitable improvement model for the replanted soil of homestead in residential land in mountainous and hilly areas, it is of great significance to improve the quality of soil for homestead reclamation.