bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Construction Strategy of Energy Conservation and Emission Reduction in University Campuses in Beijing
Authors: shengshi Tang , yuqing Zhao , Wangxu  , jiayu Deng , xin Yang , xiangyang Hou
Published: May 2020

The per capita annual energy consumption of colleges and universities is much higher than the national per capita annual energy consumption, and the difference in energy consumption level among colleges and universities is also large, and the building energy conservation potential of colleges and universities is large. Taking a university in a cold region as an example, this paper made a statistical analysis of the comprehensive energy consumption in the past four years, and found that the proportion of energy consumption in the building environment energy system was the highest, accounting for 68.9%. This paper puts forward the construction strategy of campus energy emission reduction for building environmental energy system, which not only provides support for scientific assessment of energy consumption level and energy saving, but also promots the policy of building energy saving transformation in existing universities.
Study on the Effect of Exogenous Salicylic Acid on Algae Growth in the Environment
Authors: Xu Qiuyang , Shi Meixue , Wang Shaohua , Qing Yuchun
Published: May 2020

With the development of industry, synthetic drugs and their secondary metabolites bring some hidden dangers to environmental safety. As an excellent drug, salicylic acid is widely used in cardiovascular drugs, industrial dyes, skin care and acne products, etc. Therefore, it is possible to detect salicylic acid molecules, its derivatives or secondary metabolites in the natural environment. It should be noted that salicylic acid, as an endogenous signal molecule, can greatly affect plant growth. In this study, the common algal Spirogyra in fresh water was taken as the research object. The effects of exogenous salicylic acid on the growth of Spirogyra were analyzed through the changes of chlorophyll content and plant cross section during the growth of Spirogyra. It is found that the concentration of salicylic acid in the natural environment generally promotes the development of algae and improves their resistance to environmental stress. Therefore, as a possible correlation index of algal blooms, it deserves our attention.
Method Prediction for the Environment of Vibration Structure in Consideration with Elastic Joint
Authors: Yang Yan
Published: May 2020

In order to accurately and efficiently predict the environment of vibration structures with elastic joints, the BUSH equivalent elastic joints unit of MSC. Nastran software was used to deduce the natural frequencies of structures with elastic joints by using the Fixed Interface Mode Synthesis Method (FIMSM).An example structure with elastic joint is designed, and both FIMSM and traditional FEM are used to calculate the first 30 order natural frequencies of the example structure. The results show that, compared with FEM, the relative calculation error of FIMSM is within ±1.31%. Consequently, via using BUSH element to simulate the elastic joint, FIMSM possesses the ability to predict the Environment of Vibration Structure considering elastic joint precisely and efficiently.
Sustainable development of ecological environment in resource-based cities in Heilongjiang Province
Authors: Sun Lu
Published: May 2020

Based on the specific situation of ecological environment of resource-based cities in Heilongjiang Province, this paper puts forward the development goal and key points of sustainable development of ecological environment, and puts forward the guarantee measures of sustainable development of ecological environment of resource-based cities from three levels of government, enterprise and the public.
Construction of Key Environmental Factors Index System for Ecological Route Selection in Subtropical Mountainous Highway
Authors: Zhao Ming , Hua Kai-cheng , Zhang Dong , Ni Dong , Yuan Min-min , Wang Zhao-ming
Published: May 2020

Based on the study of the ecosystem of the Huizhou-Qingyuan section of the Shantou-Zhanjiang Expressway, this paper is taking the sub-tropical mountain ecosystem as a reference. The author is selecting indicators from the three aspects of the ecosystem’s composition, function and habitat. The paper is applying the mathematical analysis methods such as component analysis and non-repeating two-factor analysis of variance to obtain an index system including the diagnosis of the degree of ecosystem degradation in the subtropical mountainous areas.
Research on Identification and Supervision of Ecological Background of Subtropical Mountainous Highways Based on Multi-source Data
Authors: Zhao Ming , Hua Kai-cheng , Zhang Dong , Ni Dong , Yuan Min-min , Wang Zhao-ming
Published: May 2020

Based on the UAV remote sensing method combined with multi-source remote sensing data, the ecological background of the subtropical mountainous area was investigated based on the Huizhou to Qingyuan section of the Shantou-Zhanjiang Expressway. Ecological background evaluation indicators are the theoretical basis to support the analysis and evaluation of this article. The ecological indicators of roads in South China have selected five indicators: vegetation cover index, water environment index, soil erosion index, terrain slope index and land use type index.
Exploration on Comprehensive Utilization Technology of Mine Tailings
Authors: ri le Ge , Liang Yan Su
Published: May 2020

With the stable and sustained development of the domestic economy, the demand for various mineral resources is increasing. Mineral resources have great value for social and economic development. Mineral resources provide the vast majority of raw materials for domestic economic development. However, in the actual mining process, many beneficial substances are discarded in the form of tailings. After a long period of extensive mining, the amount of domestic minerals has gradually decreased. Outdated mining methods lead to a substantial increase in costs, while leaving many mine tailings. The insufficient utilization of tailings has formed many obstacles to the sustainable development of the industry. Many components of tailings are still valuable, so they must be turned into waste. Vigorously carry out the recycling of resources and promote the common development of the economy and the environment. We are supposed to attach importance to the ecological environment and adverse effects of tailings, and adopt scientific measures to reduce the adverse effects of tailings on the ecological environment.
Inversion and Analysis of Land Surface Temperature based on Landsat - a case study of BeiBei District in Chongqing
Authors: Yang Zhou , Na-na Liu
Published: May 2020

Land surface temperature is the surface of the earth’s energy change and the exchange process, which is an important index for a lot of scientific research. In this paper, the surface temperature changes of BeiBei district in Chongqing in the past 20 years were inverted in 6 time phases. The surface temperature inversion method of Landsat remote sensing data was studied, and the atmospheric correction method was adopted to conduct the inversion by using Landsat5TM and landsat8OLI-TIRS image data. The results showed that from 2004 to 2014, the area of high temperature area increased year by year, and the area of low temperature area also increased year by year.
Study on Using Single UAV’s image for Extraction Measurement of Flat Area
Authors: AL-Qadri Mohammed , Cheng Jianchuan
Published: May 2020

A new technology Unmanned Aerial Vehicles (UAV), is increasingly used by land surveyors for various applications. CV software for processing drone images has made great strides in making it easier to use and reducing the need for human intervention. CV method relies on tie point extraction from a set of overlapping images, which used to generate a model for the area of interest. However, using this technique to process large areas at an acceptable resolution requires huge photos and significant computer resources. Therefore, this study aims to assess the measurement accuracy that can be obtained from a single UAV image, taking into account the accuracy and time consumption. Firstly, the multirotor UAV was used to capture the ground at a certain altitude. Then the data were processed using two software packages. The outcomes of both software were compared against actual data for accuracy assessment. The results show that both processing methods provide excellent accuracy result; the ground resolution is within the range of 0.2~3.7cm\pixel, which comply with international standards. In conclusion, this study demonstrates the feasibility of using high accuracy UAV image to extract the measurement of a flat area with reliable accuracy in a short time.
Construction of foundation pit monitoring information cloud platform based on SaaS mode
Authors: Qiong Liu , Dongling Zeng , Zhengping Ouyang , Yinzu Zhang , Yongchang Yang , Yong Liu
Published: May 2020

With the rapid development of Internet cloud computing technology, big data and visualization and other new technologies, the powerful data storage, calculation and analysis capabilities of new technologies provide favorable conditions for improving the timeliness, reliability and informatization level of foundation pit monitoring. By using SaaS mode and cloud computing technology, this paper subdivides the requirements of foundation pit monitoring work, and puts forward solutions according to design thinking and design means. The foundation pit monitoring information cloud platform is built in the way of Cloud Architecture, which greatly improves the efficiency of foundation pit monitoring, and realizes the high sharing of monitoring data information and platform resources.
Study on Coulomb Stress Evolution Along Altyn Fault
Authors: Wei He , Fuqiang Shi , Pan Liu , Yunhe Gu
Published: May 2020

Taking the altyn fault zone as the study area, the maxwell layered viscoelastic medium model and the PSGRN / PSCMP program were used to study the evolution of the cumulative coulomb stress over the altyn fault from 1900 to 2020, analyze the future seismic hazards of faults in the altyn fault zone. The results show that: the minfeng earthquake and changma earthquake were mainly caused by the long-term tectonic loading of the altyn fault. The wuzunxiaoer S8 section and the shulehe 4 S18 south section were affected by the combined effects of the changma earthquake and long-term earthquake loading. In particular, the maximum cumulative coulomb stress of shulehe 4 S18 south section is 2.58Mpa,which is a great danger to strong earthquakes.
Study on unloading energy characteristics of limestone in different crossing sections
Authors: Liao Yilin , Liu Jianfeng , Zhang Qiangxing , Li Zhicheng , Xu Deng , Zhu Anqi
Published: May 2020

In order to study the energy characteristics of limestone under different initial confining pressures and different unloading rates, based on MTS815 flex test GT rock mechanics test system and acoustic emission (AE) 3D positioning real-time monitoring system, the unloading test and acoustic emission synchronous monitoring of limestone are carried out. The results show that: (1) the pre peak energy process is dominated by energy accumulation, but mainly occurs in the loading stage. The proportion of energy in the unloading stage is basically unchanged, and the proportion of elastic energy is more than 0.9, which fluctuates only before the failure. During the failure, the proportion of energy in the stress drop changes dramatically, and the proportion of elastic energy decreases rapidly to 0. (2) In the coal measure strata, the energy dissipation is the main factor, the dissipation energy and its proportion increase rapidly, while in the front of coal measure strata, the energy release is the main factor, the elastic energy decreases rapidly and the dissipation energy does not increase. (3) The proportion of coal bearing strata in front of coal bearing strata is 0.68 and 0.57 respectively. Unloading elastic energy ratios before coal-bearing strata and coal-bearing strata are 0.824 and 0.876, respectively.
Research on Population Spatialization Method Based on PMST-SRCNN
Authors: Li Yuting , Liu Minghao , Li Yinxing , You Peng
Published: May 2020

How to improve the accuracy of population spatialization by using downscaling technology has always been a difficult issue in academic research. The population spatialization model constructed from the global or local perspective alone has its own limitations that cannot capture the local and global characteristics of the population distribution. Based on the counties of Chongqing municipality in 2010, this paper uses the two steps of “removing-rough” rasterizationof partitioned multivariate statistical regression and the “getting-accuracy” of super-resolution convolutional neural network to construct a coupling model of population spatialization to complete global and local Feature learning and compare and analyze with other four schemes. The results show that the mean square error and root mean square error of the coupled model of partitioned multivariate statistical regression and super-resolution convolutional neural network are the lowest, especially in densely populated areas. Studies have shown that although super-resolution convolutional neural network has a good ability to downscale learning, it still does not reflect the heterogeneity of population spatial patterns well, and the coupling of multilevel global feature learning models and super-resolution convolutional neural network models can make up for this to a certain extent.
Research of Dynamic Azimuth Gamma Instrument while Drilling for Mine
Authors: Long Chen , Gang Chen
Published: May 2020

In view of the problems that the existing gamma logging instruments in coal mines can only carry out static fixed-point measurement and are not suitable for rotary drilling, this paper, based on the analysis of the characteristics of measurement while drilling in coal mines and the principle of gamma logging, designs and realizes the dynamic gamma azimuth instruments for mines by means of power line carrier, rotation positioning and gamma measurement technology, which can measure the intensity of natural gamma ray in two directions around the borehole in real time, effectively reflect the changes of different radioactive strata, and guide the geosteering while drilling in coal mine.
Study on the slagging of biomass briquette combustion
Authors: Xiaoping Ren , Fang Liu , Xintong Tang , Xiaoting Sun , jing Yang , song Yang
Published: May 2020

China’s coal-fired industrial boilers are characterized by high energy consumption, serious pollution, and large output of biomass briquette, which is a clean and high-quality alternative fuel to coal. However, there are serious slagging problems in combustion. Taking straw briquette as an example, this paper introduces its combustion characteristics, studies its slagging mechanism, slagging influencing factors, etc., reveals the slagging problems in essence, and provides theoretical basis for the prevention and control of slagging.
Discussion on the Optimization of Injection and Production Parameters in the Western Fault Zone of T Zone
Authors: Lou shengrui
Published: May 2020

This article mainly applies the injection-production balance board, combining the dynamic experience of oilfield development to optimize the adjustment method of injection and production parameters in fault area. Based on the law of material balance, considering the pressure limit of the fault plane and the dynamic data of development wells on both sides of the fault, by drawing the pressure balance chart of the injection and production system, the equilibrium formation pressure on both sides of the fault can be calculated. The adjustment direction is given based on the current injection and production status, so as to establish the injection and production parameter adjustment method in the study area.
Study on Application of Goaf Management and Residual Mining Technology in Niujuan Deposit
Authors: Feng Pan-xue , Huang Dan
Published: May 2020

For goaf group and high grade embedded residual ore in NO.I ore body, the overall technical idea of pre-filling the key goaf, the residual mining and the non-key goaf filling is used. The goaf management was mainly based on waste rock filling and supplemented with cemented filling, which formed safe mining environment in the upper, lower isolation belts and efficient management in hidden danger goaf. For rib pillars with cemented rock filling and waste stone filling on both sides of goaf, the method of upward horizontal common layered and small layered filling with pointed pillars were employed respectivly. For the crown pillar overlying high strength of filling body and waste rock, the united method of upward horizontal layered filling with entrance filling and caving are separately employed. Regional and local multidimensional integrated monitoring system were built subsequently. Then, relevant technical safety measures were taken. This study is to achieve the goal of safe, efficient and economical goaf management and residual mining.
Analysis and Evaluation of 7 Indictor Polychlorinated Biphenyls (PCBs) Residues in Dried Kelp by Gas Chromatography (GC)
Authors: Tian Liangliang , Shi Yongfu , Huang Dongmei , Yu Huijuan , Wang Shuai , Cai Youqiong
Published: May 2020

In this study, a special method was developed for the determination of 7 kinds of polychlorinated biphenyls (PCBs) residues in dried kelp by gas chromatography (GC) with electron capture detector (ECD). The PCBs were extracted with hexane/dichloromethane (1/1, v/v) by ultrasonic extraction. Clean-up methods were used by concentrated sulphuric acid, neutral alumina oxide solid phase extraction cartridge and silica solid phase extraction cartridge. The analytical compounds were quantified by an internal standard method. Under optimal experimental conditions, good linearity was observed in the range of 5~200ng/mL, and the correlation coefficients were 0.9993~0.9998. The limit of quantification (LOQ) for target analytical compounds ranged from 6.0 to 7.5μg/kg. At the spiked levels of 10，20，50 μg/kg，the average recoveries ranged from 81.8% to 105% with the relative standard deviations 3.05%～11.2%. The result showed that the proposed method was accurate and could be used for the determination of the PCBs in dried kelp.
Study on Slope treatment and Greening construction technology of Road Engineering
Authors: Feng Zhengwei , Lin Longbin
Published: May 2020

Slope greening is an important part of road engineering construction. Its main purpose is to improve the ecological environment on the side of the road and improve its ability to resist geological disasters.The engineering features of this paper are long road engineering, large area of slope treatment. It analyzes the technical difficulties in the construction of slope greening project, such as large excavation depth, more stone slopes along the road, serious exfoliation of external soil and less nutrients in the soil. In view of the above technical difficulties, the key construction techniques such as excavation and filling slope construction, external soil direct seeding, spray seeding of external soil with hanging net, slope maintenance, combination of skeleton protection and plant slope protection are studied. It ensured the quality of the project and provided reference for the construction of related projects.
Research on Evolutionary Design Method of BIM Technology in Highway Reconstruction and Expansion Project
Authors: Leisheng Zhou , Yinghao Chen , Jianping Xia , cheng Liu , guangliang Yang
Published: May 2020

BIM technology is widely used in expressway Construction projects. In the process of transforming two-dimensional design into three-dimensional design, there are still many problems that need to be solved urgently. Based on the Beijing-Shanghai highway reconstruction and expansion project, this paper proposes an evolutionary design method. Based on the application standard of project model technology, the method uses BIM model software, based on skeleton lines and templates, using EKL programming language to realize the structure size from coarse to fine, information from summary to detail, and progressive design method for component granularity from bottom to high. At the same time, a three-dimensional design method for automatically generating road centerlines is proposed. The results show that the evolutionary design method is in line with the current project habits, matching the existing design concepts, and can efficiently complete the design work at different stages, effectively avoiding a lot of repetitive work.
Research on the Innovative Mode of Integration of Information Technology and Education
Authors: Guohua Liu
Published: May 2020

This paper introduces the basic functions and characteristics of the Rain Classroom platform based on information technology. By using the integration of information technology and Control Engineering course teaching, a mixed teaching mode of control engineering course based on Rain Classroom is designed and applied to specific teaching practice. The results show that, the engineering thinking, learning habits, self-learning ability, learning interest and learning enthusiasm of the experimental class have been greatly improved compared with before after the practice of blended teaching.
The Impact of Accessibility of Urban Central Parks on Housing Prices of Fuzhou
Authors: Tan Wenhao , Liu Linfeng , Cui Yage , Chen Jintao , Lin Feng , Zhong Yingping , Pan Hui
Published: May 2020

The paper analysed the impact of accessibility of urban parks within the third ring on housing prices of Fuzhou through network analysis and SPSS correlation analysis based on data of sources like remote-sensing image, web crawling and urban road network, discovering that: (1)The density of residence within the third ring of Fuzhou decreases from the centre to the edges; (2) The housing price, ranging between 18000 and 28000 RMB/ m2, peaks in the city centre; (3) For houses within the third ring of Fuzhou, Gulou District enjoys the greatest access to urban parks while Cangshan District is the poorest in this regard. (4) The residence within the third ring of Fuzhou could be rated as A or A- in terms of access to urban parks, with an overall excellence performance; (5) The walking distance to the parks is significantly correlated with the housing price. The shorter the distance, the higher the price. Regarding this, the paper proposed the following suggestions: (1) Revise the routes to Gaogai Mountain Park by increasing entrances and exists to improve its accessibility; (2) Improve the transportation network and increase footpaths to the park, thus shortening the distance between the park and the surrounding residences.
Experimental Research on the Visual Characteristics of Urban Road Landscape Based on Driver’s View
Authors: Shujian Li , Guan Wang
Published: May 2020

The vision system is the main way for drivers to obtain information. The distribution of urban road landscape is one of the key factors that cause drivers to be visually irritating. This article selects typical urban road landscape environment sections to conduct driver visual search mode experiments, using quantitative evaluation and synthesis The qualitative evaluation method analyzes and compares the obtained eye dynamic data, explores the influencing factors of urban road landscape on the driver’s visual characteristics and the law of visual change. Based on the experimental data, it is proposed that road landscape design should integrate greening design and guidance signs, Urban optimization strategies for building a coherent system of urban road landscapes.
Empirical Study on Economic Analysis of Construction of Green Prefabricated Concrete Structure System
Authors: Liping Liao
Published: May 2020

At present, the socialist economy with Chinese characteristics continues to develop and the process of urbanization is rapidly advancing. The construction industry plays an important role in the development of the national economy and the process of urbanization. However, the traditional construction industry has high energy consumption and large pollution, which has brought huge pressure on the ecological environment and is not conducive to the sustainable development of the industry. The transformation and upgrading of the construction industry are an inevitable trend in the development of the industry. Prefabricated building, as a new structure, is a typical green building. This article introduces the development status of prefabricated buildings, and analyzes the influencing factors of their construction costs. The article uses survey method, literature research method, comparative research method, and empirical research method to introduce the development status of prefabricated buildings, and analyzes the factors affecting its construction costs, and concludes that national policies, technologies, and management affect prefabricated building costs. Based on this, we propose countermeasures and suggestions: strengthen macro-control, improve laws and regulations and standards; focus on training professional and technical personnel, improve the level of industry production management; scientific arrangement, strengthen management, improve industrial operations, and conduct empirical analysis.
Application of Least Square Approximation Algorithm in the Game Analysis and Data Prediction of the Core Competence Signal of Civil Engineering Employment
Authors: Yang Lei , Zhou Guangxiu
Published: May 2020

The least square approximation algorithm is often used to predict the data based on historical experience. In this paper, the method is applied to the research of “game analysis and data prediction of the core competence signal of civil engineering employment”, which theoretically verifies the existence of “weak sequence” rational equilibrium in civil engineering employment by means of mathematical reasoning. In addition, the method is applied to the prediction of civil engineering major in one university in Heilongjiang Province from 2010 to 2019 as an example, and the empirical data of employment prove the real existence of the game signal. Finally, according to the method, the research predicts the related data of employment in 2020.
Application of micro expansion cement in Pavement Base
Authors: Hongjun Li
Published: May 2020

Cement stabilized macadam base is widely used as a road building material in various grades of highways. Based on the law that the base cracking is mainly affected by the shrinkage of cement stabilization materials, this paper introduces the method of adding micro-expanding cement to the base that can effectively reduce the hydration shrinkage coefficient and dryness shrink factor. At the same time, it is pointed out that strict control of the amount of micro-expansion cement and the quality of the construction can also effectively reduce the occurrence of cracks in the base.
Performance evaluation and viscoelastic model establishment of recycled hot mix asphalt
Authors: Yang Yanhai , Yan Xitai , Yang Ye , Cui Hong
Published: May 2020

In this paper, the pavement performance of recycled hot mix asphalt with 30% recycled asphalt pavement (RAP) content is studied by mix design, splitting test, freeze-thaw splitting test and dynamic modulus test. The results show that the recycled hot mix asphalt with 30% RAP content has better high-temperature deformation resistance than hot mix asphalt, but low temperature performance is slightly worse, and the water stability is not much different. It is proved that the road performance of recycled hot mix asphalt with 30% RAP content is the same as that of hot mix asphalt. Recycled hot mix asphalt with 30% RAP content can be widely used. The flexural creep test data at different temperatures were fitted to the exponential decay function, which proved that the recycled hot mix asphalt conformed to the generalized Maxwell model, and provided parameters for the establishment and analysis of the viscoelastic mechanical model of the recycled hot mix asphalt.
Optimization of Earthwork Allocation Path as Vehicle Route Problem Based on Genetic Algorithm
Authors: Deng Naifu , Li Xuyang , Su Yanmin
Published: May 2020

In civil engineering, earthwork, prior to the construction of most engineering projects, is a lengthy and time-consuming work involving iterative processes. The cost of many AEC (Architecture, Engineering and Construction) projects is highly dependent on the efficiency of earthworks (e.g. road, embankment, railway and slope engineering). Therefore, designing proper earthwork planning is of importance. This paper simplifies the earthwork allocation problem to Vehicle Route Problem (VRP) which is commonly discussed in the field of transportation and logistics. An optimization model for the earthwork allocation path based on the modified Genetic Algorithm with a self-adaptive mechanism is developed to work out the global optimal hauling path for earthwork. The research results also instruct the initial topographic shaping of the Winter Olympic Skiing Courses Project. Furthermore, this optimization model is highly compatible with other evolutionary algorithms due to its flexibility, therefore, further improvement in this model is feasible and practical.
Research on design requirements and key technology of green highway
Authors: Yang Xing , Zhang Liang
Published: May 2020

Starting from the development background of green highway in China, this paper analyzes the development process, connotation characteristics, construction concept and main construction ideas of green highway. At the same time, starting from the key source of green highway construction - design stage, this paper analyzes the key technical requirements of green highway design, as well as the key technical points in the design process of each specialty. Through the control of the design source, the core content of green highway design can be more clear, and the direction for the better construction and development of green road in the future can be pointed.
Countermeasure Study of Green Transportation Development in the Context of Supply-side Structural Reform
Authors: Lv Anqi , Xin Dong , Wang Zhoukai , Li Liyong
Published: May 2020

Green transportation is the most urgent transportation transformation choice in the area of rapid urban expansion and sustainable economic development. It is an important embodiment of the concept of urban sustainable development in transportation. This paper analyzes the status quo and problems of green transportation development of the case study of Zhejiang Province from several aspects such as equipment transportation, trip environment, transport efficiency and management ability, as well as the situation facing; propose the key tasks in improving comprehensive transportation system, constructing ecological infrastructure, popularizing energy-saving and environmental protection transportation equipment, developing intensive and efficient transportation organization, promoting science and technology leading and intelligent transportation; and finally, expound the guarantee measures of green transportation construction.
Study of the Planning and Design of Tourism Highways Based on Green Ecological Concept
Authors: Xin Dong , Wang Yongxin , Xu Quanliang , Yan Hai , Lv Anqi
Published: May 2020

With the integrated development of transportation and tourism, building tourism highways has become a new direction leading the transportation industry and also an important sector of green transportation. Currently, the planning, design and construction of tourism highways in China are at their early stage, and there are few relevant codes, specifications, and standards concerning the planning and design. This paper introduces the connotation of Tourism Highways, and clarifies the scope and principles of the planning and design. It puts forward the planning and design concept of coastal tourism highways, and carries out planning and design practices for coastal highways in Guangdong based on the concept.
Analysis and Improvement of Emergency Mechanism for Hazardous Chemicals Accidents in Qingyang City
Authors: Sun Ning , Gai Ke , Guo Qingling , Li Zhenhua , Chen Zhanjun
Published: May 2020

In recent years, with the rapid development of the economy, the dangerous chemicals enterprises in Qingyang City have also expanded and developed rapidly. The development of hazardous chemicals enterprises is increasing, the factors of instability are increasing, and the frequency of accidents involving hazardous chemicals is also increasing. While hazardous chemicals companies bring benefits, they also bring a serious threat to human life, health and property security. As a city with more dangerous chemicals companies, Qingyang has many potential safety hazards. In order to cope with many pressures, the Qingyang Municipal Government is vigorously carrying out safety production inspection and emergency mechanism construction in the hazardous chemicals industry. This paper analyzes the problems and deficiencies in the emergency management mechanism of Qingyang City from the aspects of accident prevention and early warning, emergency response, emergency plan preparation and emergency drill, which are mainly reflected in the weak foundation of accident early warning, imperfect laws and regulations, and weak awareness of public participation in emergency management. Finally, through the analysis of the existing problems and deficiencies, the emergency mechanism of Qingyang dangerous chemicals accident is improved.
Cloning of MYB10, PAL and UFGT genes from ‘Cuihongli’ and ‘Qiangcuili’
Authors: Xingyu Long , Huifen Zhang , Qunxian Deng , Mengwei Chen , Haiyan Wang , Hui Xia , Dong Liang , Xian Luo , Honghong Deng , Lijin Lin , Xiulan Lv
Published: May 2020

PAL, UFGT as structural genes and MYB10 as a regulatory gene play an important role in the accumulation of anthocyanins in plants. In this experiment, ‘Cuihongli’ and ‘Qiangcuili’ were used as materials to clone PAL, UFGT and MYB10 related to anthocyanin synthesis by homologous sequence cloning. The results showed that the full length of PAL was 2160 bp, encoding 719 amino acids; the full length of UFGT was 1428 bp, encoding 475 amino acids, and the differences of PAL and UFGT between the two cultivars were one amino acid and three amino acids, respectively. The sequence length of ‘Cuihongli’ MYB10 gene is 732 bp, which encodes 243 amino acids and belongs to the superfamily of SANT family. Homology analysis and phylogenetic tree analysis showed that the proteins encoded by PAL, UFGT and MYB10 genes were short and closely related to Prunus persica, Prunus avium, Prunus armeniaca and Prunus cerasifera in Rosaceae.
BRCA1, BRCA2 and primary ovarian insufficiency
Authors: Zhang Yinuo
Published: May 2020

BRCA1 and BRCA2 genes belong to the family of ataxia-telangiectasia-mutated (ATM)-mediated DNA DSB repair genes that play a critical role in the DNA double-strand break (DSB) repair. Mutations in BRCA genes significantly increase the lifetime risk of breast, ovarian, fallopian tube and primary peritoneal cancers. In addition to the increased risk for multiple malignancies, recent literature suggest that mutations in BRCA genes could lead to decreased ovarian reserve and subsequent ovarian aging. In this review, we will focus on role of BRCA1 and BRCA2 in ovarian function, particularly ovarian aging and primary ovarian insufficiency. Serum AMH values are generally lower in BRCA1 mutation carriers but not in BRCA2 mutation carriers. BRCA2 carriers were more likely to have chemotherapy-induced amenorrhea DNA not stable, linking with ovarian aging. The mechanism by which BRCAs mutation in the pathogenesis of POI is the inpaired function of repairing DNA breaks. Future studies investigating the knockout models to elucidate the role of the BRCAs genes in ovarian development and oocyte maturation will be interesting.
Design of Multi-speed Motor Control System Based on S7-1200 PLC and Frequency Converter
Authors: Zhou Hengchao , Li Guangpeng , Liu Yuanyong
Published: May 2020

In order to realize multi-speed control of motor, a control system based on S7-1200 PLC and Siemens MicroMaster420 frequency converter is designed. Through the analysis of the cooling fan control requirements, the hardware system and software programming of the whole control system are designed. The PLC control unit of the control system completes signal acquisition, logic control and communication, etc. The system sets the parameters of the converter by changing the on-off state of the converter digital input, and further realizes the steering change and speed adjustment of the motor. Through experimental comparison, it is concluded that the control system designed in this paper can save more than 30% of the electric energy. The load of the motor is greater, and the energy-saving effect is more obvious. The advantages of the control system are simple circuit structure and convenient operation. The designed control system is simple and effective to realize the multi-stage control of the motor and improve the reliability and stability of the motor.
Study on The Mechanical Properties of Steel - Basalt Fiber Composite Reinforcement (SBFCBs)
Authors: Zhao Lei , Sun Shengjiang , Qi Wei
Published: May 2020

Steel bar and Basalt Fiber are combined to obtain a new structural material with high strength, high elastic modulus, high toughness, corrosion resistance, low cost and other excellent comprehensive performance: Steel Basalt Fiber Composite Bars (SBFCBs). In this paper, three different types of composite bars were tested by monotonic tensile tests, and the failure patterns of steel bars were introduced in the process of stretching, and the yield strength, ultimate strength, elastic modulus and stress-strain curves of steel bars were obtained. Test results showed that the stress-strain curve of SBFCBs was obviously double-folded, and SBFCBs exhibited stable post-yielding stiffness after the reinforcement yielded. The stress-strain curve model of SBFCBs under uniaxial tension was derived according to the material’s compounding rule. By sorting the experimental data and comparing it with theoretical values, we could prove the accuracy of the model.
Analysis and Countermeasures of Stuck Failure of SR Steering Gear of a Ship
Authors: Han Xingxing , Wang Yongquan , Hu Cun , Su Xianming
Published: May 2020

This paper introduces the structure and working principle of SR type steering gear, describes an example of stuck failure of the steering gear. The author uses the exclusion method and the shallow to deep method to analyze the causes of the failure from five aspects, and finally locates the failure, and then proposes two aspects of steering gear management considerations.
An Estimation Method of Fire Extinguishing Time in Closed Ship Cabin
Authors: Fang Tang , Pan Li , Guofeng Chen , Jianghui Xie
Published: May 2020

There are many potential fire hazards in ship engine cabin, especially in the closed environment of submarine underwater. Fires in cramped cabin are usually harder to put out, therefore, enclosing cabin is a possible means of extinguishing fire. In this paper, typical fire scene in ship engine cabin is analyzed firstly, then a two-layer zone model of engine cabin fire is established combined with structural characteristics of engine cabin. According to the mass conservation and energy conservation, fire smoke layer change rule is described to estimate extinguishing time. At last, typical hydraulic jet fire and electrical fire smoke layer calculation is taken as an example. The result shows that enclosing cabin is a fast and effective method, and the method of estimating fire extinguishing time in engine cabin by this paper is feasible.
Failure analysis of isolation switch in transformer substation
Authors: Xie Yi , Qiao Yaxia , Zhang Hao , Lou Hongjian
Published: May 2020

To analyze the fault cause of metal parts of isolation switch, a series of tests including macro check, penetrate testing, hardness measurement, composition tests and metallographic observation have been carried out. The experimental results showed that the failure of connecting lever was caused by improper processing, which resulted in the limitation of cracking and stress corrosion cracking. Based on this, the corresponding noteworthy key points were put forward to avoid similar accidents.
Theories and applications of electrical quantum benchmarks
Authors: Bai Jingfen , Yang Yubo , Lu Da
Published: May 2020

The voltage unit and the resistance unit are the basic units in electrical metering. The Josephson voltage standard and the quantized Hall resistance standard have replaced the physical reference that was maintained by standard batteries and standard resistors. This paper investigates the working principle of voltage quantum reference, resistance quantum reference and current quantum reference. Furthermore, the applications of these new electrical References are discussed. This study provides theoretical support for the development of electricity value transfer methods.
The adaptive assessment method for different energy storage applications in large-scale re-electrical load access regions
Authors: Xu Zhicheng , Liu Jun , Li Zhuonan
Published: May 2020

In the context of energy transformation, re-electrification has become an important way to build a clean and low-carbon energy system. The large-scale re-electrical load access further increases the flexibility requirements on the user demand side. The application of the energy storage system (ESS) can not only improve the degree of electrification of the energy system but also improve the energy utilization efficiency. This paper analyzes the different development modes and key characteristics of energy storage on the power supply side, grid side and demand side in large-scale re-electrical load access areas. Five dimensions (such as storage security, technology maturity, system cost, storage scenario suitability and storage scalability) are selected to characterize the feasibility of a certain energy storage technology in a given application scenario. For different application scenarios, studying the appropriate development mode and its adaptability to the environment will help the healthy and sustainable development of energy storage.
Load Frequency Control of Power Systems Based on ADRC
Authors: Liu Qian , He Meikui , Fang Zhen , Gui Ting , Dong Changqing , An Jing
Published: May 2020

Load frequency stability is an important power quality index in power system, any sudden load disturbance will cause the system load frequency deviation, and as the power system becomes more complex, the difficulty of control is also increasing, it is necessary to find a more appropriate control method. Considering that the load frequency control system model has the characteristics of multi-variable and strong coupling, combines the superior anti-interference and anti-coupling ability of the active disturbance rejection control, a novel scheme for power system load frequency control was presented based on the principle of active disturbance rejection control and effective open-loop transfer function. The simulation results show that the proposed method is simple tuning and strong decoupling ability, and provides a successful control of load frequency.
Research on Dynamic Characteristics of Furnace in 670 t/h Ultra-high Pressure Pulverized Coal Furnace after Burner Transformation
Authors: Zemin Wang
Published: May 2020

The power field characteristics of a 670t/h boiler in a power plant were studied after the burner transformation. The results show that the size of the aerodynamic fluid in the hearth of the burner is appropriate, the furnace is full, and the center of the strong wind ring is basically in the center of the hearth. The wind speed of the wall around the water-cooled wall is within a reasonable range; there is a certain wind speed deviation on the side, and the angle of the SOFA reverse wind can be adjusted appropriately to eliminate the residual rotation existing at the furnace outlet. The research results can provide a reference for the transformation of burners of the same type.
Experimental study on heat transfer performance of gas-liquid pulsating heat pipe heat exchanger
Authors: Shang Fumin , Liu Chaoyue , Yang Qingjing , Dong Yifang , Cao Weijia , Liu Jianhong
Published: May 2020

With the continuous development of industrial technology, the safety and efficiency of thermal equipment work in related industries and industrial fields are facing many problems. First, with the improvement of integrated level, the size of electronic components is getting smaller and smaller, and the heat load per unit area is increasing, which makes the traditional heat dissipation method difficult to meet the requirements; second, with the increase of energy-saving pressure, the temperature difference of low-temperature waste heat recovery is reduced, and the traditional heat exchange equipment is difficult to meet the working requirements. The pulsating heat pipe has the characteristics of small volume and excellent heat transfer performance. In view of the heat transfer performance of the pulsating heat pipe, we designed the gas-liquid pulsating heat pipe heat exchanger and studied its heat transfer performance, which has been verified to be effective.
Construction and application of adaptive semi-Infinite boundary element with dynamic problems on half-plane
Authors: Zhang Mei , Tang Bo , Li Hongjun
Published: May 2020

For thedynamic problem ofhalf-plane, if the radiation condition at the semi-infinite boundary is not taken into account in the numerical calculation, the accuracy of the result will be affected.In this paper, the basic theory of time-domain boundary element method (TD-BEM) and the propagation characteristics of stress waves in elastic media are used to transform a semi-infinite boundary into a semi-infinite boundary element which can adjust the size of the element automatically with time-space parameters.Enablingthe element to simulate radiative damping effects in the far field.At last, the efficiency of theelement is verified with a half-plane example under dynamic load by comparing its results with the results of the finite element method (FEM). Theverificationshows thatthe adaptive semi-infinite element can effectively simulate the radiation conditions in the far area. And it is convenient to use TD-BEM to solve the half-plane dynamics problem.
The optimization design of the triangular mesh of the lamella ellipsoid reticulated shell and the comparative analysis of its static performance
Authors: Chong Shuai , Huang Lili , Cao Junchao , Lu Xiaoyang
Published: May 2020

Using the traditional geometric principle and ANSYS software Parametric Design Language (APDL), the optimization method is given for the triangular shell mesh of lamella ellipsoid. The mechanical properties of two types of ellipsoidal reticulated shells, optimized isosceles shell (OIS) and traditional shell (TS), are analyzed by comparison with ANSYS software. The results show that the ellipsoidal reticulated shell composed of an optimized isosceles triangle mesh has better mechanical performance and is widely used in engineering.
Hydraulic Balance Debugging Method for Air Conditioning Water System
Authors: Hu Qin , Yuan Zhongyuan
Published: May 2020

By installing the balance valve in each user branch, the pressure at both ends of the balance valve is obtained in real time by using the pressure measuring instrument, and then the hydraulic balance calculation program is written by combining the fluid network matrix and MATLAB software to calculate the balance valve opening value under the design flow of each user branch. This calculation program only needs to input a few simple data to calculate the opening of each balance valve when each branch reaches hydraulic balance. Experimental results show that the method can achieve good results in hydraulic balance debugging.
Néandertal et Afrique, le retour
Authors: Jordan Bertrand
Published: May 2020

Sophisticated analyses of current human populations compared to a high-coverage Neandertal genome sequence indicate that, contrary to the previous consensus, African genomes carry a small but significant amount of Neandertal-specific DNA. This indicates back-migration into Africa of modern humans (carrying some Neandertal sequences) and underlines the complexity of ancient human migrations.