bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative study on the cadmium accumulation of five colour cherry tomato seedlings
Authors: Dong Yiping , Liu Han , Lu Jing , Peng Xuemei , Tang Wanjia , Tang Yi
Published: May 2020

In order to study the differences in cadmium (Cd) accumulation and biomass of different colour cherry tomato seedlings under Cd (10 mg/kg) stress, five different colour cherry tomatoes were used as experimental objects in pot experiments. Studies have shown that the biomass of stems, leaves and above-ground parts of yellow and pink cherry tomatoes (yellow and pink) was higher, and the Cd content in the three parts was lower. The biomass of roots, stems, leaves and above-ground parts of purple and green cherry tomatoes (purple and green) was lower, and their Cd content was higher in stems, leaves and above-ground parts. Red cherry tomato (red) had higher biomass of roots, leaves and shoot, and its Cd content in leaves and shoot was also the highest.
Effects of intercropping with post-grafting generation of Cosmos sulphureus on cadmium accumulation of grape seedlings
Authors: Wang Xun , Wang Yan , Wei Xiaohan , Xiao Yunying , Xu Xiangting , Liao Ming’an
Published: May 2020

The pot experiment was carried out to study the effects of intercropping with post-grafting generation of Cosmos sulphureus on the cadmium accumulation of grape seedlings under cadmium stress.C. sulphureus which non-grafted (the offspring is named C. sulphureus S), self-rooted grafting by the same plant seedlings(the offspring is named C. sulphureus D), self-rooted grafting by two uniform plant seedlings (the offspring is named C. sulphureus T), and self-rooted graftingby two different development stages of plant seedlings (the offspring is named C. sulphureus Y). The results showed that intercropping significantly reduced the soil pH and increased the available cadmium content of the soil. Compared with grape monoculture, intercropping significantly reduced the cadmium content of grape seedlings roots. Among all treatments, grapeintercropping C. sulphureus Y maximized the biomass of grape seedlings and the cadmium accumulation of the post-grafting generation of C. sulphureus, and the cadmium content of the grape seedlings shoots was significantly lower than other treatments.
Reserach on environmental Impact assessment system of China
Authors: Chen Mingtsung , Qian Wei
Published: May 2020

In order to solve the conflict between economic growth and environmental protection, the environmental impact assessment system used by western countries has been gradually introduced into China. It is a scientific and professional assessment system, which is regarded as the best tool to solve the conflict between economic growth and environmental protection. The implementation of the environmental impact assessment system can undoubtedly prevent some construction projects from having serious adverse impact on the environment. Through the comparison and selection of the feasibility schemes, the environmental impact of some construction projects can be minimized. Therefore, the environmental impact assessment system is regarded as an important pillar and effective legal system for the implementation of predictive environmental policy, which has attracted more and more attention in the world.
Estimating the Effective Soil Temperature at L-Band Using Multi-Temporal temperature Data
Authors: Ma Hong-Zhang , Liu Su-Mei
Published: May 2020

The effective soil temperature is an essential parameter in the process of the soil moisture retrieval by using the passive microwave remote sensing data. The modeled soil temperature profile data was widely adopted to calculate the soil effective temperature at L-band. Considering that the procedure of using land models to obtain soil temperature profile is cumbersome, this study mainly investigates the effectiveness of using thermal infrared soil surface temperature and air temperature as the input parameters to calculate the soil effective temperature at L-band. The results of this study show that the average value of multi-temporal thermal infrared surface temperature and the monthly mean of air temperature can accurately calculate the soil effective temperature with RMSE=0.57K based on the simulated data of 4 years.
A Numerical Simulation of Mass Transport in Deep Convection over the Tibet Plateau
Authors: Guo Yanan , Cao Xiaoqun , Peng Kecheng , Liu Bainian
Published: May 2020

By using the WRF-Chem model to simulate a deep convection process that occurred in the eastern part of the Tibetan Plateau, the vertical transport process and main mechanisms of water and ozone in the upper troposphere-lower stratosphere were studied. The air in the lower layer of the troposphere, which is rich in water vapor and low ozone concentration, is transported near the top of the troposphere. The enhancement of convective motion causes the height of the troposphere to rise and the temperature to decrease. Therefore, water vapor is prone to condensation and dehydration, and ice crystals are formed near the top of the troposphere, resulting in a low value zone of water vapor at 100 hPa. By analyzing the distribution of ozone, it is found that there is a high concentration of ozone transported on both sides of the deep convection area. The stronger the convection, the stronger the downward transport. It further explains that this deep convection process not only causes the upward transport of tropospheric air in the deep convection area, but also causes the transport of stratospheric air to the troposphere on both sides of the deep convection area.
Mechanisms of oxide copper nanoparticles toxicity to microorganisms and ammonia-oxidizing bacteria and recommendations for future study
Authors: Ouyang Fan , Peng Dan , Liu Dantong
Published: May 2020

In recent years, the biological toxicity of oxide copper nanoparticles (CuO NPs) to microorganisms has received some attentions. The toxicity mechanism of CuO NPs can be concluded as follows: (1) CuO NPs facilitate more rapid dissolution of ions than equivalent bulk material, which potentially leading to increased toxicity of CuO NPs; (2) CuO NPs can generate reactive oxygen species (ROS), and potentially disturb the functioning of protein, enzymes and DNA; (3) CuO NPs have high capacity to adsorb biomolecules and interact with biological receptors, they can reach sub-cellular locations leading to potentially higher localized concentrations of ions once those particles start to dissolve or degrade in situ. Ammonia-oxidizing bacteria (AOB) are the main functional bacteria for biological nitrogen removal in the environment. It has been reported that CuO NPs can change the community structures of AOB, however, the toxicity mechanism of CuO NPs to AOB in cytological level is rarely reported. This review aims to evaluate the current understanding of CuO NPs toxicity to microorganisms, as well as to provide a set of pointers and guidelines for future studies to access the toxicity mechanism of CuO NPs to AOB.
Green mining policy for environmental protection and sustainable development
Authors: Ro Sunghyok , Yan Deru , Kim Sewon
Published: May 2020

Environmental protection is an inevitable choice for the sustainable development of human society. According to EPA data, 21% of global greenhouse gas emissions come from the industrial areas. The mining is one of the main source of greenhouse gas emissions. To achieve sustainable economic development and ecological environmental protection, the miningindustry must be green. The developed countries have taken policies related to green mining since the 1970s and have already achieved great results. At present, the developing countries such as China have also adopted a series of various legal and institutional measures related to the mining, but it is still not perfect compared with the developed countries, and there are still serious environmental pollution problems.Therefore, this paper will discuss the causes of the environmental problems in mining and the green mining policies of some developed countries, and analyze the current situation of China’s mining industry. Finally, this paper proposed a green mining policy model for in developing countries such as China for environmental protection and sustainable development.
Influence of the south-north bias of the South Asia High on the water vapor distribution in the upper troposphere-lower stratosphere of the Asian monsoon region
Authors: Tu Houwang , Wang Yongxian , Dong Xiongxin
Published: May 2020

Based on the ERA-40 reanalysis data provided by the European Interim Numerical Forecast Centre from 1958 to 2002, the influence of the north-south bias of the South Asia High(SAH) on the water vapor distribution in the upper troposphere-lower stratosphere of the Asian monsoon region is analysed. It is shown that: (1) The north-south bias of SAH has little influence on the position of the 200 hPa water vapor high value centre, which mainly affects its intensity; and it has a great influence on the position and intensity of the 100 hPa water vapor high value centre; It has little effect on the water vapor distribution at 70 hPa. (2) In the south years of SAH, the anti-cyclone is abnormally weak, the vertical ascending motion is relatively insubstantial, and the water vapor transported to the upper troposphere is less than the north years. Therefore, the water vapor high value in the south years is smaller than that in the north years. (3) Abnormal temperature distribution of 200 hPa in anticyclone is consistent with the abnormal distribution of water vapor, and the warm centre is conducive to the formation of high water vapor. It is shown that the distribution of water vapor in the anticyclone range is caused by the interaction of temperature field and circulation field. This study has a certain reference meaning for understanding the stratospheric-tropospheric exchange of the Asian monsoon region.
Discussion on the value of some parameters in the calculation of regional water pollutant discharge amount
Authors: Peng Zhenhua , Yang Le , You Aiju
Published: May 2020

Calculation of water pollutant discharge amount is the basis for compiling regional water pollution control plans and water resources protection plans. Although most of the calculation parameters can be obtained from the relevant standards or guidelines, the calculation and value method forsome important parametersare not clear or have different reference standards, such as urban sewage treatment rate, rural domestic pollution discharge coefficient and sewage discharge amount from service industry. Take the calculation of pollutant discharge amount in Hangjiahu plain as an example, the calculation method and value range of the above parametersis discussed in this paper.
Research on Application of Green and Low-carbon Building Technology
Authors: Luo Lei , Chen Yiyu
Published: May 2020

The application of green low-carbon building technology in the construction industry has gradually been promoted. The construction industry, as an energy-intensive and consumable industry, can reduce the energy and resource consumption of the industry with the combination of green and low-carbon building technology. This also indicates that the future construction industry will realize the development of low-carbon buildings and achieve sustainable development of the construction industry.
Analysis of Harm and Ecological Governance of Industrial Brownfields
Authors: Luo Lintao
Published: May 2020

In the process of urbanization, due to the improvement of industrial technology and the adjustment of industrial structure, many old-fashioned factories were forced to close down in competition, resulting in a large number of industrial brownfields, which seriously hindered the development of social economy. Varying from other environmental problems,the damage caused by brownfields is the result of long-term accumulation and presents hysteresis,andit conducts a serious threat to the health of human beings.Therefore, it is urgent to carry out industrial brownfield treatment and restoration. This paper mainly focuses on the status of industrial brownfield pollution, and the sources and hazards of several commonpollutants. The advantages and disadvantages of physical, chemical and phytoremediation technologies are summarized. It provides some reference for the treatment and restoration of industrial brownfields.
The extraction of maize lodgingregionsin UAV imagesusingdeepfully convolutional neural network
Authors: Zheng Ergong , Tian Yingfang , Xu Zhaohong , Chen Tao
Published: May 2020

This paper presents a method for automatic extraction of maize lodging regions in unmanned aerial vehicle (UAV)visible images. A deep fully convolutional neural network is used to achieve the purpose.Firstly, images are collectedby using UAV remote sensing, and then the network is trained and validated on a total of more than 20000 labelled images, and finally, the network is able toaccurately extractlodging regions. Experimental results demonstrate the effectivenessof the method and F1 score reaches 89.5% on test dataset. This study makes a major contribution to the assessment of maize lodging disaster.
Changes in pectin components of different blueberry varieties during fruit development
Authors: Li Henggang , Huang Jinqiu , Bie Yuhui , Huang Yingying , Wang Xun
Published: May 2020

In order to reveal the mechanism of texture change during the fruit mature period of the main blueberry cultivars in Sichuan Province, this paper studied the content of different pectins in the cell wall of ‘Brigitta’, ‘O’Neal’, and ‘Britewell’ cultivars during the period of the 25th to 70th days after flowering period. It was found that the water-soluble pectin content (WSP) in ‘O’Neal’ and ‘Britewell’ increased continuously as the fruits matured. In contrast, the content of alkali-soluble pectin (SSP) continued to decrease. These may be related to changes in PG enzyme activity. In the pink fruit period (the 49th day after flowering), the chelant soluble pectin (CSP) content of the three varieties all reached the highest value, which may be due to the higher PME enzyme activity. In general, the pectin of the fruits of all three varieties gradually degrades as their maturation.
Comparative Screening Test of Three Peach Varieties In Jiangyou
Authors: Zhang Qing , Pang Pan , Xiong Bo , Zhou Zhiyang , Jiang Xinyao , Han Yan , Wang Huaer , Li Huizhi , Xia Xianming , Chen Zhaofang , Tan Liping , Yang Youting , Sun Guochao , He Siya , Wang Zhihui
Published: May 2020

In this experiment, three peach varieties introduced to jiangyou, Sichuan province were used as materials, and local varieties were used as controls. The multi-dimensional value theory and the combination rule of Reasonableness-Satisfaction degree were adopted to carry out variety comparison and screening, so as to find the most suitable varieties for promotion in this region.
Review on Applicability of Vision-based Detection Technology in Field Obstacle Detection
Authors: Wang Qiao , Meng Zhijun , Liu Hui
Published: May 2020

In order for robotized field operation by agricultural machineries and complete replacement of manual work in field operation, autonomous obstacle avoidance of agricultural machineries during field operation becomes a critical technology to be solved. For this technology, it is an indispensable requirement and critical premise to timely and accurately perceive static and dynamic information of field obstacles. Firstly, this paper analyzes and determines what obstacles are the target obstacles in the field operation of agricultural machineries from the two aspects - whether the obstacles hinder current operation and whether the obstacles hinder current obstacle avoidance process. Subsequently, this paper mainly discusses the applicability of obstacle detection methods based on monocular vision and binocular stereo vision in field environment: the main existing monocular vision-based methods to detect obstacles are summarized, and their restraints for detecting obstacles in the field are analyzed; considering that precise stereo matching of image pairs is the most complicated and time-consuming part of binocular vision-based detection methods, currently used typical stereo matching algorithms are summarized and compared, and their applicability in field obstacle detection is discussed. At last, the research direction is prospected, and a tendency to detect obstacles for agricultural machineries during field operation is based on multi-sensor fusion system with vision sensor as one of the main sensors.
Discussion on the structure and function of seeds to Cerasus discoidea
Authors: Nan Cheng-Hui , Xue Xiao-Ming , Xie Chun-Ping , Yi Xian-Gui , Wang Xian-Rong , Yan Yi-Han
Published: May 2020

Through morphological anatomy, viability measurement, seed germination and seedling growth observation, it was found that there was a ring band structure between the brown seed coat and embryo of Cerasusdiscoidea, which was the residual endosperm of Cerasus, and the seeds of Cerasus are composed of seed coat, remaining endosperm and embryo. The remaining endosperm consists of two parts: the endosperm sheath and the endosperm ring. Remaining endosperm is beneficial to the maintenance of seeds viability and the protection of seeds embryo germination and growth.
Identifyingthefactors affecting on farmers’ intention to engage in organic certification scheme in China
Authors: Tang Yan
Published: May 2020

The main purpose of this study is to investigate the factors affecting the intention of farmers to engage in organic certification scheme (OCS) in China. A research-based model incoroprating the theory of planned behavior (TPB) is proposed to obtain a better understanding of psychological factors that influence farmers’ intention to adopt improved fertilization practice under OCS. The TPB hypothesizes that adoption is driven by intention, which in turn is determined by three psychological constructs: attitude, subjective norm, and perceived behavioural control. Results show that factors leading to a greater probability of changing fertilizer application in accordance with the organic certification scheme included age, perceived resources, subjective norms, crop type, and attitude.
Effects of organic manure application on blueberry fruit quality and soil condition
Authors: Wang Xun , Li Yuan , Ye Xiaoshuang , Kang Xiaoru , Wang Jin
Published: May 2020

The present study investigated organic manure of southern highbush blueberry cultivated in southwestern China. We studied the efficiency of three organic fertilizers produced from locally accessible resources, namely rapeseed residue (RS-R), cattle manure (Cat-M), and chicken manure (Chi-M). Fruit quality, and soil chemical properties were analyzed. Rapeseed residue at the highest concentrations (2 or 3 kg RS-R plant−1) improved fruit sweetness (total soluble sugar and water-soluble sugar contents) and anthocyanin content, and depressed soil pH.
Effect of the control of white-blush of fresh-cut carrot and its process optimization
Authors: Chen Chichang , Chang Xiguang , Chen Xiangning
Published: May 2020

In order to control the whiteness of fresh-cut carrots and optimize the fresh-keeping process of fresh-cut carrots, taking whiteness value, sensory quality evaluation and total carotene content as indicators, a single factor experiment was designed to compare the different concentrations of citric acid and ascorbic acid, and the effect of different packaging materials on fresh-cut carrots was analyzed by grey correlation degree; by using the optimal concentration of color-protecting agents, three packaging materials with good effects, and different cleaning agents as research factors, orthogonal experiments were designed to optimize the fresh-keeping conditions of fresh-cut carrots. The results showed that 0.60% citric acid and 0.40% ascorbic acid can significantly (p < 0.05) inhibit the whitening of fresh-cut carrots. The best fresh-keeping process was that packaging with No. 15 packaging material, water as the cleaning agent, and 0.60% lemon Acid + 0.40% ascorbic acid for color protection.
Research on pig face recognition model based on keras convolutional neural network
Authors: Wang Ke , Chen Changxi , He Yuxiang
Published: May 2020

Traditionally, the RFID technology is generally used for the identification of pigs in vivo. However, the method of electronic ear tags and ear tags will cause great pain to the pigs, then ear tags will easily fall off during the pig’s activities, increasing the operating cost of the enterprise. This paper uses the powerful feature learning and feature expression capabilities of convolutional neural networks in deep learning to automatically learn the facial features of pigs. Use the Image Data Generator that comes with Keras to perform data enhancement on the pig face pictures of ten pigs and generate pig face dataset. This paper proposes a convolutional neural network model based on LeNet-5 for facial image recognition of pigs. Experimental comparisons were performed by using SGD, Adam and rmsprop optimizers with dropout ratios of 0.3, 0.5and 0.7. Experiments show that when the SGD optimizer is used and dropout is 0.3, the model recognition rate is the highest, which can reach 97.6%.
Meteorlogical outliers detection based on artificial intelligence
Authors: Xue F , Zheng W , Zhang M , Wu Q , Yang Z , Ai X
Published: May 2020

To precisely evaluate the effect of artificial precipitation of Project Tianshui, anomaly data within the large dataset collected is supposed to be detected and dealt with reasonably, to enhance the analysis and prediction of the data. Using the data accumulated from 2008 to 2017 from Wushaoling Meteorological Station, and the data from May 2019 to October 2019 from the dedicated supervising network built for the project, taking temperature(0.1°C) and other meteorological data as example, anomaly dectection is conducted by the arithmetics Local Outlier Factor and Isolation Forest respectively. Consistency check is also conducted via the two arithmetics. The main outliers of the accumulated data for ten years are isolated outliers. LOF works pretty well, while Isolation Forest performs unsatisfying. The main outliers of the dedicated supervising network data are of a continuous outlier sequence. LOF can hardly detect the anomaly, while Isolation Forest precisely find out the outliers. Both arithmetics perform well on consistency check in space. The differences of LOF and Isolation Forest are compared. New ideas of using artificial intelligence arithmetics to detect meteorological outliers and pre-process the data are provided.
Effects of biochar application at different rates on chili growth
Authors: Song Zewei , Zhang Yuchan , Kudakwashe Meki
Published: May 2020

Biochar is a solid carbonaceous residue from biomass pyrolysis under anaerobic conditions. It has been well-known that biochar enhances plant growth and improve soil quality as the soil amendment. However, for chili (Capsicum annuum L), it is unknown whether biochar addition has any effect on its productivity. Thus, we studied the effects of different dosages of biochar addition at rates of 1.5% and 3% (w/w,1.5%BC and 3%BC) on the germination and growth of chili using a pot experiment. The results show that the 3%BC increased the weight of fresh shoots and roots by 17.4% and 14.6%, respectively. However, the addition of biochar has no pronounced effect on the chili yield. Therefore, it is very important to choose the appropriate biochar and addition proportion for its application in agricultural soils.
Study on leakage plugging agent for steam well casing of heavy oil injection
Authors: Cao Mengmeng , Wang Haiwen
Published: May 2020

This paper analyses the causes of the casing leaks of heavy oil thermal recovery wells, and analyses the trapping and sealing methods used in the current oil fields and their existing problems. Aiming at the problems of poor temperature resistance, insufficient strength, short plugging period and high cost for traditional cement and polymer plugging agents, a high temperature resistant plugging agent suitable for plugging in steam injection wells has been developed. The performance of the plugging agent was analysed and evaluated. The research shows that the high temperature-blocking agent has high strength, high temperature resistance, and high salinity and easily injected. It can withstand temperatures up to 300 °C and strength above 90 MPa. The plugging agent can meet the application requirements of the steam injection well.
Application of rock brittleness evaluation in tight oil exploration—— Taking Lijiaweizi Fault Depression in Qijia Area as an Example
Authors: Zeqiang Wang , Yunfeng Zhang , Bo Sun
Published: May 2020

Brittle rock is one of the key factors in the use of unconventional oil and gas exploration technology to be considered, The stronger the brittleness of rock is, the easier to produce fractures to form fracture network in the over flushing of fracturing, the stock of oil and gas storage layer will be increased, and the production of single well will be increased. At present mainly based on rock elastic parameters, we use Young’s modulus and Poisson’s ratio of two ways to analyze brittle rock in earthquake prediction evaluation. However, since these two methods in the process, both the need for elastic parameters of rock normalized, leading to large errors, adaptability reduce. Based on this, we propose a Young’s modulus and Poisson’s ratio coefficient of utilization of compared to the brittle rock evaluation method to effectively improve the accuracy of prediction and evaluation of brittle rock and anti-jamming capability, while the brittle evaluation method based on the use of pre-stack seismic inversion of elastic parameters to Qijia area of Songliao basin compact oil brittle rock predict deployment guidance wells to obtain stable high level of industrial oil flow.
Experimental study on single phase flow characteristics in tight sandstone oil reservoirs
Authors: Liu X F , Zhao Z L , Li J F , Sun N , Chen Z J , Ji A Z
Published: May 2020

Tight oil resource is distributed worldwide and has great potential for exploration. As tight sandstone reservoirs have small pores and narrow throats, the liquid boundary layer has great influence on the seepage, inducing starting pressure gradient during fluid seepage. In this paper, flow characters of both single water and single oil phase is investigated. Results show that the curve of flow velocity vs. the pressure difference doesn’t pass through the origin. Extending the trend line will intersect the abscissa pressure difference, indicating it is non-Darcy flow for both single water and oil in tight sandstone cores. The permeability increases slowly with the increase of displacement pressure difference until basically stable.
Rock alteration adjacent to fractures and its effect on reducing capacity in Beishan granite
Authors: Tian Xiao , Wang Ju
Published: May 2020

In order to determine the rock alteration and its effect on reducing capacity in Beishan granite, mineralogy and geochemical analysis of the rock adjacent to fractures have been preliminarily performed during site characterization. The results show that the altered rock takes some specific changes in mineralogy and chemical composition compared with the unaltered rock. The variation of some elements (Na2O, CaO, Fe, etc.) content in the specific altered rock is mainly related to the changes in mineralogy. The Fe(II)/Fetotal-ratio analysis indicates that the alteration around fractures has little effect on reducing capacity of the bedrock.
Analysis technology and application of natural fractures based on microseismic monitoring results
Authors: Li Hao , Fan Li , Qin Li , Tang Yong , Huang Yaqiu
Published: May 2020

In general, the matrix permeability of shale reservoirs is small, and a developed natural fracture network is required to obtain a good mining effect. Therefore, analyzing and understanding the development of natural fractures in the reservoir plays an important role in increasing the production capacity of shale gas. Microseismic monitoring is the key technology of fracture imaging during hydraulic fracturing. Based on the results of ground microseismic monitoring, this paper analyzed both the waveform and energy of microseismic event, as well as the spatial distribution law, and also combined it with the surface seismic attribution data, formed a natural fracture analysis technology based on the results of microseismic monitoring, which played an important supporting role in real-time optimization and guidance of hydraulic sand fracturing.
Study on Fast Test and Calculation Method of Integrity Coefficient of Surrounding Rock During Tunnel Construction
Authors: Cai Jianhua , Jibin Liu , Ting Xu , Yongyue Shi
Published: May 2020

In this paper, the need of obtaining the rock integrity index in the rapid classification of surrounding rock during the tunnel construction is briefly described. The conventional rock integrity index is introduced and the rapidity of its test acquisition is analyzed. Based on the design of quick test arrangement for rock integrity coefficient, a method of data acquisition and preprocessing for field test of wave velocity of rock block (body) in face is proposed. For the first time, two calculation models of rock block wave velocity and rock mass wave velocity are put forward, one is the calculation model of asymptote method, the other is the calculation model of trend line method. The principle, calculation process, reliability and adaptability of the two calculation models are analyzed and compared. Finally, the trend line method is proposed as the integrated solution of rock block and rock mass wave velocity. Thus, the rapid acquisition of rock integrity coefficient is realized, which lays the key technical foundation for the rapid classification of surrounding rock and the research and development of equipment system during the tunnel construction period, and finally provides the basis and guidance for the dynamic design and construction of tunnel engineering.
The current status and further developments of geohazard monitoring and early warning program in China
Authors: Bing Han , Bin Tong , Yanling Zhang , Chunrong Yin
Published: May 2020

China is one of most severely threatened countries by geohazard in the world. To further improve the capacity of geohazard prevention and reduce potential damage, meteorological early warning on various scales, mass prediction and disaster prevention and professional monitoring have been implemented and achieved great progress, which lead to the great reduction in number of casualties. However, with the increase of engineering disturbance, tectonic activity and extreme climate events, the prevention and mitigation of geohazard should be further strengthened from different perspectives including the implementation of field investigation on geohazard triggering conditions, advancement and application of regional geohazard mapping, improvement of regional meteorological early warning, monitoring of geohazard development using integrated technologies involving remote sensing, LiDAR, InSAR, etc, and capacity of observation and monitoring by public.
Study on the influence of water systems and roads based on arcgis on the layout and morphology of the forest plates in western Sichuan
Authors: Wan A J , Liu Y X , Xie X J , Tu R Q , Qi X L , Chen H L
Published: May 2020

The research is about the influence of water source and road traffic conditions on the layout and pattern of the forest plates in western Sichuan, which provides a scientific basis for the quantitative description of the forest plates in western Sichuan. This paper establishes the gis research platform based on the relevant basic data of the research area provided by the Deyuan Town Government. The buffer zone analysis, neighborhood analysis, fractal analysis and variance analysis were used to study the relationship between the shape and pattern of the forest plates and the water system and the road. The trend model of the forest plates’ circular rate and the distance between the road and the water system was constructed respectively. The research results are that the optimal distribution distance of the forest plates from the water system is 10∼40m. The optimal distribution distance of the forest plates from the road is less than 50m. In the buffer zone of 0-50m and above, the road has a greater influence on the morphology of the forest plates. The trend model of the forest plates’ circular rate and the distance between the road and the water system respectively is nonlinear. Compared with the water system, the forest plates tends to be distributed in places with better road conditions.
Approaching the Forming Environment of Shelly Chenier in the West Coast of Bohai Bay: exemplified by Chenier III in Yucenzi site
Authors: Jing Fang , Zhiwen Shang , Wang Fu , Yang Li , Zhang Liping , Yang Shuo , Wang Tianjiao , Liu Yufei , Yang Yongqiang
Published: May 2020

In order to explore the causes of formation of the cheniers on the west coast of Bohai Bay, the Yucenzi chenier near the third chenier on the West Coast Plain of Bohai Bay is taken as the research object, and drilling investigations of the sediment under the Yucenzi chenier was conducted to measure the conductivity of the slime turbid water and identify the foraminifera of the drilling samples. The results showed that the underlying sediments of Yucenzi chenier are formed by a 534m thick continental sedimentary layer, and the chenier does not contact with the marine or transitional sedimentary layer directly. It can be inferred that the Yucenzi chenier belonging to the third chenier is formed through shells accumulated on the supratidal zone during storm tide or spring tide.
Water sensitivity evaluation of sandstone oil reservoirs with ultra-low permeability
Authors: Liu X F , Sun N , Zhao Z L , Xu H W , Li J F , Cao F , Chen Z J
Published: May 2020

The development of sandstone reservoirs with ultra-low permeability has become one of the most important energy resources worldwide. Such reservoirs suffer formation damage easily, such as water sensitivity, from foreign fluid during well drilling and completion for extremely poor physical properties. In order to deeply understand the damage degree of water sensitivity of there reservoirs, water sensitivity analysis of Chang 6 reservoir rock samples was carried out, including water sensitivity of block matrix and fracture rock samples. Results show that there are none or weak water sensitivity damage for block matrix while medium water sensitivity damage for fractured samples. The study is of significance to the reservoir damage control in ultra-low permeability oil reservoirs.
Research and Engineering Practice of Gas Accurate Drainage Technology with Hole-substituted Roadway in Mabao Coal Mining Area of Jinneng Group
Authors: Wang Xiaopeng
Published: May 2020

Take Jinneng Group Mabao Coal Industry as an example, the company carried out research on the precise gas extraction technology in hole-substituted roadway in the mining area, instead of high-drilling lanes and roof high-drilling holes for gas drainage, to achieve better gas drainage effects and projects benefit. Actively exploring the gas management model of Jinneng Group’s high and overburden mines and mine goafs is of great significance for safe and efficient production of the mine.
Color Difference Optimization Method for Multi-source Remote Sensing Image Processing
Authors: Zheng Zhao , Tang Xinming , Yue Qingxing , Bo Ai , Lin Yaoyao
Published: May 2020

This paper proposes an approach to solve the problem of color inconsistency after the fusion and splicing of multi-spectral images of multi-source domestic satellites, by using regularly division the high-resolution remote sensing images, block by block computing the multiple linear regression and percent clip stretch. First of all, the remote sensing image is divided into blocks and multiple linear regression is carried out separately in each block. Secondly, on the basis of the image to be corrected after regression, percentage truncation and stretching are carried out on the over-concentrated gray band, so that the gray histogram distribution of the gray band is similar to that of the reference image. This scheme ensures that all pixels participate in the calculation, which not only improves the accuracy of the model, but also avoids the problems of long processing time and memory overflow caused by the large amount of high-resolution remote sensing image data. At the same time, each scene image selects an appropriate truncation percentage according to the evaluation index to solve the problem of excessive color difference caused by too concentrated image band gray. The experimental results show that the scheme in this paper can effectively solve the problems of too large color difference and too concentrated gray scale in image band. Compared with traditional methods, it has better performance in model accuracy, color retention and time efficiency.
Experimental Study on Blasting Funnel under Cylindrical Uncoupled Charge
Authors: Lv Xianpeng , Lv Fangping , Li Chuan , Wang Hailiang
Published: May 2020

According to the Livingston blasting funnel theory, a series of single-hole blasting funnel tests were performed at the May Fourth Square Station. The relationship curve between blasting funnel volume and drug embedding depth was plotted, and the variation curves of blasting funnel depth, vibration speed and noise with burial depth were obtained. The MATLAB software was used to perform four-term regression on the test data, and the parameters such as the optimal burial depth, critical burial depth, and optimal explosive consumption of the blasting funnel were calculated.
New solar heating system based on graded heat conduction
Authors: Song Wangyu , Shi Decai
Published: May 2020

Building a low-carbon society and developing a low-carbon economy have become the new goals of current development. In China, the energy consumption of buildings, industrial energy consumption, and transportation energy consumption constitutes three major energy consumptions. This project proposes a new type of solar heating device, which uses high-efficiency, fast heat-dissipating, and thermally stable heat-conducting oil instead of water in a traditional heating device as the heat-conducting medium, and designs a new type of solar-heating system based on oil-water grading heat conduction.
Simulation and analysis of energy consumption in the use of industrial building of wall panel
Authors: Li Zhiyong , Zhang Zehua , Cheng Yamei , Qiao Chunzhen
Published: May 2020

The energy consumption of industrial building wall panels in the use phase is simulated. The temperature variation and heat transfer of wallboard with different thickness of insulation layer in different climate zones were studied. The results show that the difference of daily average heat transfer is less than 0.01 MJ/M2 for the wall panels with different thickness of insulation layer in the same city in summer. However, the daily average heat transfer among cities is quite different. The daily average heat transfer of Guangzhou wallboard is the largest, which is more than 1 MJ/m2, followed by Beijing. The average daily heat transfer is maintained above 0.69 MJ/m2, and Shanghai’s wallboard has the least average daily heat transfer, only 0.32-0.33 MJ/m2. It can be known from the above data that Beijing needs to choose a composite wall board with a thermal insulation layer thickness of 6 cm in winter, Shanghai uses a composite wall board with a thermal insulation layer thickness of 4 cm, and Harbin chooses a composite wall board with a thermal insulation layer thickness of 6 cm or more to meet the insulation requirements.
Green synthesis and possible applications of MoO2 nanoparticles
Authors: Ye Qianjin , Wang Yu , Wu Guangliang , Yu Yan , Wang Furong , Li Jing
Published: May 2020

This work reports the green hydrothermal synthesis of MoO2 nanoparticles and their applications in Cr6+ adsorbent and MoO3 precursor. A green hydrothermal method, which was based on the autoclave-sealed reactions of (NH4)6Mo7O24•4H2O and glucose in acetic acid (12.5 vol%) aqueous solution at 190 °C for 12 hours, was proposed for the synthesis of MoO2 nanoparticles. The characterization results from X-ray diffraction and transmission electron microscopy suggested the successful preparation of pure monoclinic phase MoO2 (m-MoO2) nanoparticles. The m-MoO2 nanoparticles exhibited a good adsorption capacity for Cr6+ (for example, 300 mg of m-MoO2 nanoparticles can adsorb the whole Cr6+ in 300 mL of 50 mg/L K2Cr2O7 aqueous solution after mixing for 280 minutes). Besides, the m-MoO2 nanoparticles can be completely converted to orthorhombic phase MoO3 nanoflakes after heating in air at 400 °C for 5 hours.
Analysis and Research on Safety Evaluation of Oil and Gas Pipelines in Goaf
Authors: Wang Dongyuan , Zhang Zhengyong , Tan Qiuxia , Yang Jian
Published: May 2020

Through the analysis of the subsidence of the mined-out area of the mine, the characteristics and laws of its subsidence can be mastered. According to different subsidence types and subsidence, a reasonable calculation model is used to calculate and analyse the stress of the pipeline, and the stress and strain values at different points of the pipeline are obtained. At the same time, by studying different pipeline laying methods, a reasonable pipeline laying method is selected from them to meet the adaptability of the pipeline to the ground subsidence of the goaf. When optimizing the laying method of the pipeline, the design concept and method based on the strain are used to put forward requirements for the strain of the pipeline, formulate reasonable design guidelines, and finally determine reasonable countermeasures according to the design guidelines, thereby improving the design level of the mine’s goaf pipeline, and ensure the intrinsic safety of the pipeline and coordinate the relationship between pipeline construction and mineral exploration.
Green and Efficient Method for Recycling Valuable Metals from Scrapped Lithium Cobalt Oxide Cathode Materials
Authors: Guo Miaomiao , Xi Xiaoli , Zhang Dongdong , Yang Hang , Bi Fan , Hu Yi , Nie Zuoren , Xu Kaihua
Published: May 2020

In this study, green and efficient method for recycling valuable metals from scrapped lithium cobalt oxide cathode materials to form lithium carbonate and cobalt powder was proposed. To this end, aluminum and iron impurities were efficiently removed from scrapped lithium cobalt oxide cathode materials through alkali dissolution and magnetic separation with removal rates of 99.9% and 98.3%, respectively. After removal of impurities, lithium cobalt oxides were reduced by hydrogen at high temperature of 650 °C for 3 h to yield Li2O, Co, and very small amounts of CoO and LiOH. Next, the mixture was subjected to water leaching and sodium carbonate precipitation to obtain lithium carbonate with purity of 99.5%. The water-leaching Co and small amounts of cobalt oxides were again reduced by hydrogen to form cobalt powder with purity of 99.4%. In sum, the proposed method looks promising in terms of efficiency, easy for implementation, environmentally-friendliness, and potential industrialization.
A DFT study of Co8S6(PH3)8 on Stability and Magnetic
Authors: Li Ting
Published: May 2020

The structural, electronic and magnetic properties of Co8S6(PH3)8 and Co8S6(PH3)m(CO)n (1<=n<=2) clusters have been studied in detail using the first-principle method based on density functional theory. The presence of CO can significantly enhances the activity of Co8S6(PH3)8 clusters and manipulates magnetic properties. Detailed PDOS analysis shows that the charge transfer from Co atom to CO reduces the magnetic moment of the corresponding Co atoms. Not only by decreasing the Fermi level of the Co8S6(PH3)8 from -3.02 eV to -3.22, -3.41 eV, but also disappearing the H-L gap at the Fermi level.
ANSYS Simulation Model of Buried Metal Pipeline Corrosion Detection
Authors: Zhang Chunmei , Liu Longhuan , Liao Xian , Hu Xuquan , Fu Zhihong , Li Bo
Published: May 2020

Corrosion testing of buried metal pipelines is an important measure to ensure the safe operation of pipelines. In order to investigate the transient electromagnetic field named response of buried metal pipelines, a three-dimensional simulation model was established by using multiphysics simulation software named ANSYS Multiphysics to calculate and analyze buried metal pipelines with different corrosion degrees, ie different wall thicknesses, on the receiving coil after the excitation signal is turned off[1]. The induced electromotive force changes, the results show that the larger the wall thickness, that is, the smaller the corrosion degree, the slower the attenuation of the induced electromotive force curve of the receiving coil, the smaller the wall thickness, the faster the attenuation; and the verification was experimented: the transient electromagnetic method can effectively detect the degree of corrosion of metal pipes buried under the ground.
Influence of Pollution Degree and Humidity on the Discharge Characteristics of Porcelain Insulators in Fog Chamber Environment
Authors: Pei Shaotong , Zhang Zhe , Liu Jiashuo , Li Yonglin , Liu Yunpeng
Published: May 2020

In order to study the influence of pollution degree and humidity on the discharge characteristics of porcelain insulators in a fog room environment, this paper uses Comsol Multiphysics software to simulate the electric field distribution of clean and dirty insulators in a 110kV transmission line with or without a fog room. The results show that the electric field around the clean insulator in the foggy room becomes larger at the high-voltage side and the low-voltage side becomes smaller than that in the non-fog room; and the electric field around the insulator in the fog room becomes larger as the contamination increases.
Research on Optimal Control of PFC of Thermal Power Units in DC UHV Grid
Authors: Li Jun , Miao Weiwei , Meng XiangRong , Gao Song
Published: May 2020

By analyzing the change of grid frequency during direct current(DC) ultra high voltage(UHV) faults this year, it is found that the use of conventional primary frequency control(PFC) technology in thermal power units cannot suppress the occurrence of extreme frequency of the power grid, and the conventional PFC method can no longer adapt to the frequency control of the power grid. By analyzing the control signals and control logic of the unit participating in the frequency regulation of the power grid, the PMU(phasor measurement unit) frequency signals that are closely connected to the power grid are introduced, and the second-order differential feed-forward is used to achieve overshoot compensation, which makes the frequency modulation action faster and more accurate, ensuring the power grid’s safe and stable operation.
Analysis on the determination of specific heat of air at constant pressure
Authors: Wang Yarong , Wang Peirong
Published: May 2020

Heat calculation is often encountered in industrial production and life. For example, the calculation of flue gas heat release or the heat absorption of working medium in thermal equipment in thermal power plant boiler is a common heat calculation. This paper mainly introduces the experimental principle and method of specific heat of gas, and measures the average specific heat of air at constant pressure. Through this experiment, we can be familiar with the basic measurement methods of temperature, pressure, heat and flow in the experiment. In this paper, we compare the experimental data with the actual data, and analyze the cause of the error.
Comparison between Chinese and British Standards for Strand Anchor Structure Design
Authors: Wang Jinfeng , Chen Taoxiao , Tian Yingchun , Hu Zhengkai , Yao Xingang , Li Liangquan
Published: May 2020

In this paper, the relevant provisions regarding the classification, safety factor, strand anchor structure design and corrosion protection design are compared between the British standard BS EN 1537:2013, BS 08081:2015 and the Chinese national standard GB 50086-2015, the main differences of the strand anchor design are summarized, which can be used as reference for other strand anchor designers and researchers.