bluuebunny/crossref_metadata_2025 huggingface dataset:
Research Progress on Recycling Technology of Lead-containing Glass in Waste Cathode Ray Tubes
Authors: Jin Yin , Lei Zhao , Tong Xu , Zhilin Zhang , Shuo Li , Wenjie Tang
Published: March 2020

With the development of kinescope technology, the quantity of discarded cathode ray tubes (CRTs) glass continues to increase. The waste CRTs glass contains a lot of lead, which could bring about the environmental risk. Based on the research status on the treatment of lead-containing glass in waste CRTs, the technologies of lead separation and recycling were summarized, and their characteristics and developments were analyzed. It was pointed out that the further research and development of new technologies in this field should pay close attention to two aspects, one is the environmental risk in the product realization process of recycling waste CRTs, and another is the satisfiability to economic feasibility and the recycled productsfrom lead-containing Glass in waste CRTs.
Field test of SNCRDeNOxtechnology in building ceramic industry and the process optimization
Authors: Huang Jianhang , Tang Zijun , Zeng Wenhao , Tang Zhixiong
Published: March 2020

Ceramic industry accounts for considerable amount of NOx emission of industrial sources in China. With stricter air protection act imposed by the Chinese government, many ceramic plants have to install deNOx devices. Among all the de-NOx technologies, selective non-catalytic reduction (SNCR) is barely used in the NOx burning area process-control. In this study, a number of first-hand data focusing on burning area NOx control by using SNCR technology of ceramic roller-hearth kiln were shared, the spraying rate, temperature range, the quantity and arrangement mode of spray guns were studied.Besides, a continuous experiment was carried out. When the spraying rate was 60 L/min, the temperature range was 900-950 °C, and two spray guns were used and arranged as opposite spraying mode, the NOx concentration after purification kept below 25 mg/m3, the removal efficiency was steadily higher than 40% with the average about 50%, and the ammonia escape met relevanttechnical specification.
Study on the heat insulation performance of fire water curtain applied to the connecting passage
Authors: Lv Ke Lei , Liu Wan Fu , Luo Peng
Published: March 2020

It provide a reference for the design of the heat insulation system of the connecting passage of the urban subway traffic tunnel, carry out 1:3 scale model experimental, discussion on the coupling of artificial ventilation and heat insulation water curtain, thermal radiation and temperature change in two tunnels. The results show that the heat insulation water curtain has good heat insulation effect under the coupling of ventilation and water curtain. However, ventilation will cause turbulence of air flow in the connecting passage, and the hot water curtain is easy to drift. Therefore, it is suggested to reduce the ventilation speed as much as possible without backflow of fire smoke, to reduce its impact on the thermal insulation water curtain.
Research on fire test of train compartment based on multi-channel parallel calorimetric system
Authors: Xu Guanzhong , Liu Wanfu , Qi Wuqin , Han Weiping , Xia Jianjun
Published: March 2020

The multi-channel parallel calorimetric system can ensure the test accuracy in the small-scale fire experiment, and also meet the measurement range of the large-scale fire experiment. Based on the test system of the railway rescue station, the solid and liquid combustibles were used for the real fire test, which were carried out outside the train compartment and inside the train compartment respectively. The real fire test was measured HRR, fire load, top maximum temperature. Through the comparison and analysis of the test data, the results showed that when the fire occurred in the confined space was harmer, so it was very important to do a good job of fire prevention and control in the confined space, especially in the tunnel. By comparing the combustion of solid and liquid, the damage of windows will increase the fire hazard.
Numerical simulation of the inhibition process of methane-air explosion under cold aerosol
Authors: Liu Fuyan , Liu Juan , Liu Fujie , Wen Chuanjun , Chen and Xinhong
Published: March 2020

In order to study the methane-air explosion suppression problem, a certain size experimental tube was used as the physical model, and Gambit was used for modelling. The ANSYS 15.0 software was used to simulate the methane-air explosion suppression process under the action of cold aerosol, and the simulation results were compared with the results of the experimental studies in the open literature. It can be seen from the numerical simulation results that the concentration of cold aerosol had a significant effect on the methane-air explosion process. When the concentration of cold aerosol was low, the methane-air would explode. The pressure-time curve in the experimental tube showed four stages: the explosion induction period, the pressure rise phase, the explosion pressure peak value phase and the explosion pressure decay phase. With the increase of the aerosol concentration, the explosion induction period was significantly prolonged, and the maximum explosion pressure was slightly decreased, and the time to reach the maximum explosion pressure was also significantly prolonged. When the cold aerosol concentration reached a certain threshold, the methane-air no longer exploded. Compared with the experimental results, the simulated values of the explosion induction period, the maximum explosion pressure value, the maximum explosion pressure time and the final pressure value under different cold aerosol concentrations matched well with the experimental measurements. Therefore, numerical simulation can provide a reference for the study of methane-air explosion suppression performance under cold aerosol.
Prediction of Remaining Discharge Time of Battery
Authors: Feng Qiming , Qian Suping
Published: March 2020

This paper mainly discusses the prediction of discharge time when lead-acid battery discharge at constant current. For one thing, the functional relationship between the discharge depth and voltage under different currents is established, and the remaining discharge time of the battery is calculated according to the mathematical model, too. Moreover, the average relative error is also calculated. For another, the binary function of voltage U with respect to current intensity I and discharge time t is established, and the MRE under different currents is also discussed. The results show that the first method is better than the second.
Study on the Suppression Effect of Vacuum Cavity on Flame and Pressure Wave
Authors: Zhang Yaping , Ning Ning , Quan Xin , Zhang Shuanwei
Published: March 2020

The vacuum cavity was used to suppress gas explosion, and the explosion flame temperature and pressure in the pipeline were studied at different attachment positions of the vacuum cavity. The results showed that the different attachment positions of the vacuum cavity not only promoted but also inhibited the temperature and pressure of the explosion flame. The effect of the explosion suppression was better at 1.3m from the inlet; the influence of different length-width ratios of the vacuum cavity on the explosion flame and pressure was analyzed under the optimal distance and found that the effect was better when the aspect ratio was 3.
Study on Mechanical Properties of Light Aggregate Concrete for Filled Core Assembly
Authors: Yang Kailin , Fang Guangxiu
Published: March 2020

This paper mainly explores the mechanical properties of lightweight aggregate concrete used for core-filled assembly members. Through the design adjustment of the mix ratio, the results show that the concrete slump is about 100mm, its workability is good, and its compressive strength is lower than ordinary concrete, but it meets the strength design requirements of prefabricated components. By analyzing the tensile and compression ratio and elastic strength ratio, the crack resistance and ductility of light aggregate concrete are better than ordinary concrete, which can provide reference for light aggregate concrete engineering applications.
The Bearing Capacity of The Recycled Concrete Two-Way Composite Slab Tests
Authors: Zhu Xiaohui , Fang Guangxiu
Published: March 2020

In this paper, recycled aggregate from waste concrete is used as coarse aggregate, and fly ash is added to replace part of cement. According to the mixture performance and 28 day compressive strength of ordinary concrete, the optimal mix proportion of recycled concrete is obtained, and then the composite plates of two materials are designed and manufactured by ourselves. By testing the compressive strength of recycled concrete and ordinary concrete, and calculating the bearing capacity of the composite plate, the results show that the recycled concrete designed in this paper has the advantages of good compressive strength, good workable slump and low cost. The composite plate has good bearing capacity in theory and meets the design requirements.
The analysis and solution of contact rubbing fault for low pressure rotor of gas-steam combined cycle turbine unit
Authors: Wu Maosong , Zhao Yuzhu , Meng Fanyang
Published: March 2020

The contact rubbing fault mechanism for low pressure rotor of gas-steam combined cycle steam turbine unit is analyzed deeply in this paper. It is include that the high start and stop frequency of the gas turbine, the special operation mode of the long-time turning and the high designed turbine turning speed are the main reasons for the axial displacement to the inlet side of the fir-tree root and the contact rubbing fault of the low pressure rotor . At the same time, this paper presents a solution to the problem of contact rubbing fault of low-pressure turbine rotor, and analyzes the dynamic stress and vibration frequency of the new blade after technical improvement. The results show that the stress of root and groove of the new blade and the vibration frequency of the new blade can meet the requirements of safe and stable operation of the unit.
Risk Assessment of Gas Explosion Disaster Based on Random Forest Model
Authors: Zhang Qing
Published: March 2020

The risk assessment of gas explosion is difficult to determine due to multiple factors. To solve this problem, a random forest model is applied to the risk assessment of gas explosion disasters in coal mines. Based on the disaster system theory, the pregnant environment, disaster factors and disaster-receiving bodies were used as secondary indicators, and the corresponding 24 tertiary indicators were selected as the evaluation indicator system. The example analysis shows that the accuracy rate of gas explosion risk category prediction of the random forest model is very high (up to 100%), and it is highly practical for small sample problems with high data dimensions; Coal seam spontaneous ignition period led to an average reduction of accuracy of 0.2 and caused the Gini index to drop by an average of 1.5. The average accuracy decrease caused by the qualified rate of air volume at the wind-use site and the coal seam gas content is almost 0, and the decrease of the average Gini index is less than 0.15.
The Impact analysis on non-Stationary Extreme Wind Speed Evolution to Wind Turbine
Authors: Gui Baolin , Shao Jiegui , Liu Wenchun
Published: March 2020

It is highly preferred to evaluate evolution of wind extremes over long time-scale with nonstationarity extreme distribution model. The annual extreme value methods, which single out the maximum wind of each year as sample data, are utilized. Thereafter, the annual wind extremes are test for nonstationarity. Finally, the maximum possible wind extreme is calculated with generalized extreme value distribution model to evaluate the influence of nonstationarity of wind extreme on safety of wind turbines. It is uncovered that the wind extreme in Hailisu, Guaizihu and Chengshantou are non-stationary. However, there is no maximum possible wind extreme and it is a positive impact on the safety of wind turbines. The wind extreme of Hengshan is stationary. The wind extremes of Huangshan is non-stationary and the maximum possible wind extreme over there is 41.416 m/s, which is notable larger than the design wind speed of 37.5m/s of wind turbines. It is of negative impact on the safety of wind turbines.
Study on Principles of Soil Respiration Monitoring and Calibration Improvement Methods
Authors: Wang Xueting , Hu Junguo
Published: March 2020

Soil respiration has an important impact on global climate change and the carbon cycle. Therefore, it is necessary to accurately analyze the principles of soil respiration monitoring. Various monitoring principles tend to deliver partially different results. In order to reduce the difference, it is necessary to explore the ways to improve the principles. The present studies focus mainly on different methods of soil respiration monitoring, but rarely on their relative principles. This paper makes comparison between the dynamic airtight chamber method, the dynamic open chamber method, the gas well method and the model method based on the domestic and foreign literature, and further discusses the calibration improvement methods according to the relevant principles, aiming to reduce the result difference between different monitoring principles.
Regional spatial patterns and influencing factors of Haze Pollution in the Pearl River Delta region
Authors: Yang Yuanhua , Tang Shaojuan , Tang Dengli
Published: March 2020

Based on the Pearl River Delta data from 2006 to 2016, this paper uses exploratory spatial data analysis technology to analyze the spatial correlation and spatial cluster characteristics of haze pollution, and uses the Spatial Durbin Model to analyze the influencing factors of haze pollution. The study finds that there is a certain spatial autocorrelation in the spatial distribution of haze pollution in the Pearl River Delta region. The direct, indirect and total effects of energy consumption on haze pollution are not significant, there is an inverted U-shaped relationship between economic development level and haze pollution, population size and industrial structure will increase haze pollution in the local and surrounding areas, technological innovation in the region has a significant impact on local haze pollution and has no significant impact on it in the surrounding areas, and the impact of FDI on haze pollution is not stable in the Pearl River Delta region.
Research on Optimization of Emission Reduction Scheme for Thermal Power Based on Linear Programming
Authors: Zhao Qiuli , Zheng Kuan , Shen Shumei , Tan Xue , Lei Yang
Published: March 2020

Coal-fired thermal power units emit a large amount of air pollutants, which has aggravated air pollution in China and seriously affected people’s life and health. Therefore, it is necessary to formulate more reasonable emission reduction plans for thermal power units in China, so as to reduce air pollution. In order to maximize the comprehensive benefit of thermal power emission reduction, this paper put forward a method of optimizing the emission reduction scheme of thermal power units based on linear programming, and calculated the emission reductions in future.
Review of risk assessment methods for infectious diseases
Authors: Han Xinxing
Published: March 2020

At present, the global epidemic situation of infectious diseases is becoming more and more serious and complex, which brings difficulties and challenges to the prevention and control of infectious diseases and poses a serious threat to public health and safety. The premise and basis of the prevention and control of infectious diseases is to carry out scientific risk assessment. Firstly, the common risk assessment methods were introduced, and the limitations of these one-time static assessment methods were analysed. Then the dynamic risk assessment methods for the transmission of infectious diseases were introduced, and expressing the transmission of infectious diseases as scenarios was proposed. Scenarios were deduced to predict the future development trends of infectious diseases. It is of great positive significance to evaluate the risks of infectious diseases according to different development trends, and realize the transition from traditional “prediction-response” to “scenario-response” for improving the emergency management capability of the transmission of infectious diseases.
Progress of ecological environment protection and restoration in China’s Giant Panda National Park
Authors: Duan Xiaoyu , Yang Shuhui
Published: March 2020

Giant panda is the world’s flagship species for biodiversity conservation and a unique national first-class protected animal in China. The construction of Giant Panda National Park is of great significance to the protection and restoration of the integrity of giant panda habitat and the improvement of China’s natural reserve system. At present, the protection and restoration of the giant panda national park ecosystem are mainly reflected in the park planning, management organization construction, and national park legislation. This paper summarizes the progress of the construction of the Giant Panda National Park from 2016, and proposes relevant solutions to the existing problems.
Landscape Evaluation of Color-leaf forest from the Perspective of Different Scales: A Case of Jinyang Village in China
Authors: Lu C T , Jiang D , Huang M , Wen Q , Liu X
Published: March 2020

With the development of forest tourism, Color-leaf forest has gradually become one of the most popular tourism destination. Based on related researches about forest landscape evaluation, this paper takes Jinyang village as the research object, which is known as the “Western Ginkgo No. 1 Village”, to conduct scenic beauty evaluation (SBE) on different scales of the same landscape. The result shows that the landscape outside the forest is affected by terrain changes, overall landscape combination, landscape contrast, human landscape, and human activities; the landscape inside the forest is affected by diameter, color of the leaves, composition and density of the forest, and leaf coverage. The results will provide some references for the practice of forest landscape planning in China.
Research on synthetic formula of a quick-drying type of radioactive contamination detergent
Authors: Wang J , Liu G Q , Zheng L , Zhao L
Published: March 2020

To synthesize a quick-drying type of radioactive contamination detergent, a solvent type of detergent based on polyurethane was designed. And the synthetic formula of the detergent was studied by theoretical calculation and experiment. Through theoretical calculation, the basic molar ratio of toluene diisocyanate, chain extender, and polyether polyol were 1.73:0.73:1. The effects of the type of chain extenders and the content of catalysts on the performance of decontamination material were studied by formula experiment. The optimized formulation of detergent was obtained and a quick-drying type of radioactive contamination detergent was synthesized by prepolymer process. The decontamination effect of the detergent on uranium dust was verified on different surfaces, and both decontamination rates exceeded 90%.
Study on Energy Requirement for CO2 Capture with Aqueous Ammonia Solution
Authors: Hu Bing
Published: March 2020

As a CO2 absorber, ammonia solution has a good application prospect. However, the high energy consumption of the process of removing CO2 by ammonia water will bring a significant reduction in the power generation efficiency and a significant increase in the cost of power generation when it is used in coal-fired power plants. In this paper, the energy consumption of CO2 removal process with ammonia solution is studied, through parameter optimization, process design and absorbent improvement, the energy consumption of ammonia decarbonization process is reduced. Economic analysis of ammonia decarbonization system is done when it is used in large coal-fired power station.
Differences of sugar components in Different Mulberry Cultivars during its ripening
Authors: Gao Xiaomin , Hou Qi , Ma Zhiling
Published: March 2020

In this paper, seven mulberry varieties were used as experimental materials, and the composition and content of soluble sugar in different varieties of mulberry during its maturation process were analyzed by high performance liquid chromatography. The results showed that the changes of fructose and glucose content in different maturity of mulberry were basically the same during the ripening process, which reached the maximum in the color-changing period and slightly decreased in the mature period, among which the composition and content of soluble sugar in Taiwan long fruit mulberry were significantly different from other varieties; Fructose and glucose components were all detected in seven mulberry varieties, and only sucrose in Taiwan long-fruit mulberry varieties. This finding provides a scientific basis for the breeding of mulberry varieties and the study of sugar accumulation patterns of different varieties.
Adsorption of Rhodamine B wastewater by sulphur acid modified fly ash
Authors: Wang Manning , Yan Tingchun , Wang Yuhang , Jin Mingji , Quan Yue
Published: March 2020

In this study, fly ash was modified using sulphur to remove Rhodamine B(RB)from aqueous solution. This paper discussed the influence of adsorption time, modified fly ash dosage, pH value, initial concentration on the removal efficiencies. The results showed that 50.0 mL RB wastewater whose concentration was 10.0 mg/L, the adsorbent dosage was 0.3000 g, the pH was 2.0, adsorption time was 60.0 min, the removal efficiencies(RE) and elimination capacity (EC) were 84.68% and 1.41 mg/L, respectivly. The modified fly ash adsorption of RB obeyed the Freundlich isotherm equation, belong to the multilayer adsorption. The adsorption process was accorded with second kinetics reaction of Lagergren. The results implied that fly ash can be effective used as adsorbent to RB wastewater.
Calculation of Carbon Emission Baseline in the Operational Stage of Public Institutions——Summer Heat and Winter Warm Region
Authors: Wang Hua , Zhao Yuqing , Zhu Xiaojiao
Published: March 2020

Based on the data of carbon emission Statistics Platform of public institutions, the baseline of carbon emission of government agencies, hospitals and schools in the Summer Heat and Winter Warm Region of China is calculated by the method of quarterback analysis. The results showed that the carbon emission baseline of three types public institutions are 0.01 tco2 / m2, 0.04 tco2 / m2 and 0.03 tco2 / m2, respectively. The results provide a theoretical basis for public institutions to reduce carbon emissions.
Visual aesthetic evaluation of highways in subtropical mountains areas
Authors: Huang Cheng-Cen , Xu Guo-Ping , Yang Hua , Wei Ming , Jia Li-Qiang , Chen Liang , Hu Hao , Wang Zhao-Ming
Published: March 2020

With the development of economy, the road construction of our country gets a rapid progress. Especially in mountain roads, the influence of road construction on environment has increasingly been focused. The environmental problems of road construction on project are mostly embodied in those problems of water, air, and ecology. landscape, this paper is taking the Baise-Leye highway as the study area, using the remote sensing and uc-winroad to assess the view of highway. The landscape consideration of public roads mainly focuses on the internal coordination and the protection and use of topography. The purpose is to form highways with smooth and changeable visual landscape corridors.
Effects of Straw Mulching on Microbial Quantity in Maize and Broccoli Soil in Dianchi Lake Basin
Authors: Li Mingrui , Zhan Fangdong , Li Yuan , He Yongmei , Wang Jixiu , Li Chengxue , Li Bo
Published: March 2020

Field experiments were conducted in Dianchi basin to study the effects of straw mulching on the quantity of ammoniated bacteria, actinomycetes, and fungi in maize and broccoli soil, using dilution plate counting method. The results showed that: (1) Compared with bare soil and uncovered soil, plastic mulching and straw mulching could increase the number of microorganisms in Maize soil. Straw mulching could significantly increase the number of fungi in maize soil, reaching 6.5×104 CFU·g−1 dry soil, which was 2.0, 1.4 and 2.7 times as much as that of plastic mulching, uncovered and bare soil respectively. The effects of straw mulching and plastic mulching on the number of other types of microorganisms in maize soils were not significantly different. (2) Compared with bare soil, straw mulching could increase the number of fungi in broccoli soil by 83%, and plastic mulching could increase the number of actinomycetes and fungi. Straw mulching could increase the number of microorganisms in soils, which is of great significance to clarify the microbial mechanism of straw mulching to reduce non-point source pollution.
Research on crushing and recycling of waste concrete
Authors: Ai Wenbo , Liu Hongmei , Zhang Jian , Lv Shuaishuai , Xu Qian , Li Huanhuan
Published: March 2020

The development of recycling waste concrete in China and abroad is reviewed in detail together with a brief review of the recycling technology of waste concrete. Advantages, disadvantages and properties of recycled coarse aggregate, fine aggregate and fine powder are discussed through extensive analysis of the literature, and new trends in recycled material development are also presented.
Research On “three public” Dispatching Evaluation System Considering Energy Conservation and Emission Reduction
Authors: Yu Tao , Huang Yupeng , Zhou Bo , Zhao Wenhui , Li Ruan , Wang Shangjia
Published: March 2020

Currently, the existing evaluation indicators of “three public” dispatching only focus on the implementation of annual power generation plan, ignoring the efforts made by thermal power enterprises to participate in energy saving and emission reduction and cross-provincial and cross-regional power substitution in the implementation of power generation plan. In order to reasonably assess the dispatching completion of thermal power plants, a “three public” dispatching evaluation system based on efficient utilization of clean energy is proposed. The system is composed of power generation planning indicators, energy substitution indicators across provinces and regions, and emission reduction indicators. The efforts of thermal power enterprises to participate in energy saving and emission reduction and energy substitution across provinces and regions to promote energy efficient utilization are fully considered. Finally, the simulation results show that the validity and rationality of the “three public” dispatching evaluation system based on the efficient utilization of clean energy can provide ideas and directions for the design of “three public” dispatching indicators, which has a certain reference value.
Effect of Gibberellin Treatment on Dormancy-breaking and Germination of Cherry Seeds
Authors: Wang Yan , Zhang Jing , He Wen , Yang Shaofeng , Wang Xiaorong
Published: March 2020

Cherry (Cerasus Mill.) species are important agricultural crops with high economic and ornamental values. The seeds of stone fruits have a long dormancy period after harvest, which cannot germinate and grow until the dormancy has been broken. In order to break the dormancy and speed up the gremination of cherry seeds, we studuied the effect of GA3 treatment on the dormancy-breaking and germination rate of Chinese cherry and sweet cherry seeds without cold stratification. The results showed that GA3 treatment significantly increased the germination rates of cherry seeds, reaching the maximum value of 64%, 24% and 40% at the concentration of 100 mg•L−1 of GA3 for cultivated and wild Chinese cherry, and sweet cherry. In addition, GA3 treatment obviously speed up the germination index of cherry seeds, reaching the maximum value when immersing seeds with 100 mg•L−1 of GA3. Therefore, it is necessary to cultivate cherry seedlings by GA3 treatment.
Study on combustion and emission of Biodiesel Engine with different angle of oil beam
Authors: Fu Yue , Zheng Pei
Published: March 2020

In order to reduce the excess pollutants caused by environmental factors, on the basis of the installation of post-treatment device, through the use of converse software, the simulation research on the combustion process of non road diesel engines in the cylinder was carried out in the cold environment, and the combustion processed and emission reduction of diesel engine were optimized under the condition of only changing the angle of oil beam. The results show that the temperature in cylinders is the highest, and the pressure in the cylinder is larger, the equivalence ratio and eddy current intensity in cylinder are stronger, the emissions are lower, and the emissions of NOx and soot are the lowest under the angle of 164° fuel beam.
Fine particle emission from agriculture soil erosion based on wind-tunnel experiment
Authors: Lu Hongyue , Liu Chunyu , Wang Yaqian , Zhang Hui , Sun Yanling , Mao Jian , Ma Zhenxing , Chen Li , Gao Shuang
Published: March 2020

PM2.5 generated from soil can cause air pollution problem in China. Therefore, controlling soil dust is important to improve air quality. The study investigated the physical and chemical properties of the soil (moisture content, CaCO3, OC, EF) in a city of China and used a wind tunnel for simulating wind erosion process to explore the PM2.5 emission properties from soil surface. Experimental conditions include three sampling heights (20, 40 and 70 cm above the ground) and five wind speeds (from 4 to 12 m/s with the increment of 2 m/s). The studies showed that PM2.5 emission rate from soils obeyed exponential function increment. Emission rate ranged from 0.3 to 233μg/m2·s. Sandy loam cinnamon with lowest moisture content and CaCO3 had the largest emission rate. Soil type, wind speed and sampling height from soil surface all had significant impact on emissions rate.
Effects of atrazine on the black community land function and role of microbial ecology
Authors: Zhang Yaosheng , Tian Long , Ma Ruixi , Wei Yanxiang , Yang Jiali , Sun YanBin , Li Lan
Published: March 2020

By measuring the concentration of atrazine stress and different culture days, the abundance of key genes in soil nitrogen transformation was studied by means of real-time PCR with the increase of atrazine stress time. The abundance of soil nitrogen-fixing function gene (nif-H) increased significantly with the increase of time in the middle and late culture period (15-30 d), indicating that the abundance of soil nitrogen-fixing function gene was promoted; soil ammonia oxidation. The abundance of functional gene (amo A) was reduced at the low concentration of atrazine (0 mg/kg, 20 mg/kg), and then decreased with increasing stress time, while at high concentration of atrazine. Under the treatment of (100mg/kg), with the increase of time, the abundance of soil ammonia oxidation function increased first and then decreased, indicating that the abundance of soil ammonia oxidation function gene was affected in the process of culture. II Based on high-throughput sequencing technology, the results of soil nitrogen fixation and ammonia oxidation community diversity showed that the functional gene diversity of soil samples was affected by the concentration of atrazine and stress time. According to the analysis of soil diversity index, nitrogen-fixing functional genes of soil samples treated with atrazine at 0 mg/kg, 20 mg/kg and 100 mg/kg were tested at the late stage (30 d). The diversity index of (nif-H) was higher than the mid-test (15 d). At the beginning of the experiment (0 d), the ammonia functional gene (amo A) diversity index of soil samples treated with atrazine concentrations of 0 mg/kg, 20 mg/kg and 100 mg/kg was higher than that in the middle of the experiment (15d), studies have shown that the nitrogen and ammonia oxidation functional gene diversity is affected under different concentrations of atrazine stress time. The distribution of the nitrogen-fixing gene (nif-H) and the ammonia-oxidizing functional gene (amo A) in the horizontal sample community structure showed that the nitrogen-fixing gene was in the middle of culture (15 d), and the genus Burkholderia and Rhizobium were earlier than the culture period (0d) indicating that the above two types of nitrogen-fixing microorganisms play a leading role at this stage. Throughout the experiment (0-30 d), the number of nitrogen-fixing functional genes in the blank treatment was higher than 20 mg/kg and 200 mg/kg. The principal component analysis confirmed that the different culture days and different stress concentrations of atrazine had certain effects on the composition of soil nif-H and amo A gene communities.
Study on Induction and Culture of Callus of Citrus grandis cv. ‘Hongmianmiyou’
Authors: Wang Yan , He Wen , Xie Rui , Chen Qing , Yang Shaofeng , Wang Xiaorong
Published: March 2020

Citrus grandiscv. ‘Hongmianmiyou’ is mutated from ‘Guanximiyou’, which has been widely cultivated in Sichuan Province because of the attractive appearance, rich nutritional ingredients and trace elements. To effectively cultivate more Hongmianmiyou seedlingsfor production, we established the callus tissue induction system. The basic nutrient medium consisted of MS medium with 3% of sucrose and 0.8% of agar, adjusted to pH 5.8.Various concentrations of 6-benzylaminopurine and 2,4-dichlorophenoxyacetic, as well as polyvinyl pyrrolidone and active carbon, and culture condition were carried out to developprotocols for the in vitro propagation of pummelo. The appropriate formula was MS mediumsupplemented with 1 mg•L−1of 2,4-D,0.5 mg•L−1of 6-BAand 0.05% of active carbon. Explants were cultured maintained under a 16 h photoperiod provided by cool white fluorescent light 1200 Lux after cultured at dark for 7 days. Light green compact callus induced from semi-lignified stems explant of spring shoots in ‘Hongmianmiyou’, reaching 97% induction rate.
Quantifying the impact of climate variability and human activities on the streamflow of the Qingzhang River
Authors: Meng Pengfei , Ren Zheng , Shi Bin , Jia Tengfei
Published: March 2020

Environmental change is the main factor leading to the disturbance of hydrological processes in the basin, the evaluation of which is of great importance to the formulation of water resources planning and management strategies. Non-parametric Mann-Kendall test and Pettitt test were used to diagnose the variation trend and abrupt change of runoff time series of Kuangmenkou station. Based on hydrological and meteorological data, the VIC model was setup to simulate runoff processes. The influence of environmental change on annual runoff was quantified during different human activity period. The results showed that the runoff of the Shizhandao station presented a decreasing trend, and the abrupt change year appeared in 1978. Based on the abrupt change year the study period was divided into runoff base period from 1959 to 1978 and change period from 1979 to 2015. The model has a high applicability to the research area, and the Nash-sutcliffe efficiency coefficient and relative error both meet the requirements of the model of more than 0.80 and less than 10%. During 1979-2015, the impact of climate change and human activities on runoff reduction are 79.8%, and 20.2%, respectively. Human activities are the main driving force of runoff change of Kuamgmenkou station.
Kinetics of Iodine-catalyzed Conjugation of Soybean Oils
Authors: Yan Jie , Huang Huimin , Yang Jinlan , Zhan Qiqi , Tan Chunyuan , Lin Hailin , Wu Guojie
Published: March 2020

Kinetics of iodine-catalyzed conjugation of soybean oils was studied. The results indicated that the conjugation of linoleic acid could be described by means of apparent first-order reaction. The apparent activation energy values and the preexponential factor A were 769kJ/mol and 3.49×108s−1, respectively. The rate equation was .

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Application of total phosphorus sequential injection system in Qingdao coastal area
Authors: Shi Qian , Zhang Yanmin , Sun Zhongliang , Wang Yang
Published: March 2020

An integrated system was developed for automatic determination of total phosphorus in seawater based on sequential injection analysis combined with spectrophotometric detection. The experimental parameters of digestion were optimized based on a univariate experimental design. The upper limit of the linear range of the proposed method was 1000 μg/L. The relative standard deviations (RSDs) of accuray were below ±2% (n=3) and the RSD of presicion was 2.18% (n=6). This system has been successfully applied to determine total phosphorus in Qingdao Coastal area. The F test and t test implied the results of the system had no evident difference with those detected by nutrient flow analyzer in the laboratory.
Study of LSTM Air Quality Index Prediction Based on Forecasting Timeliness
Authors: He Hongna , Luo Fei
Published: March 2020

The change of urban air quality is affected by pollutant emission, meteorological conditions and other factors, so air quality prediction is a multi-variable, nonlinear and time-series problem, which is difficult to be predicted by traditional methods. To solve this problem, a circular neural network based on Long Short Time Memory (LSTM) is proposed to predict Air Quality Index (AQI) by considering the pollution sources, meteorological conditions and time series. The transfer entropy is used to select the meteorological factors that affect the strong change of AQI. Combined with the prediction time, the prediction accuracy of this algorithm in the future 0∼48 hours within different forecast time is studied and compared with the traditional BP neural network and the Gated Recurrent Unit (GRU), and then the Root Mean Square Error (RMSE) was used for evaluation. Taking the measured data of hourly air quality index of Chengdu from January 1, 2018 to September 15, 2019 and the measured data of meteorological factors in the same period as experimental examples, the experimental results show that LSTM has better prediction accuracy and robustness than traditional neural networks in the aging of 0∼48h forecasting, and has the advantages of temporary forecasting and short-term forecasting. At the same time, it is verified that GRU has no obvious advantage in air quality index prediction application compared with LSTM.
Control Strategy of Amplitude Regulation and Frequency Tracking for Wireless Charging Considering Load Characteristics
Authors: Wang Songcen , Zhang Yanan , Wei Bin , Tong Qingbin
Published: March 2020

When charging wirelessly, the load will change and the resonance state of the system will change accordingly. Especially when the load is not purely resistive, the efficiency and power will decrease. In order to improve the transmission efficiency and output power of the system, a control strategy control strategy of phase shift control and frequency tracking for wireless charging considering load characteristics is proposed. The control strategy adopts the frequency tracking control mode to realize the frequency tracking control through the phase of the voltage and current output of the primary side high frequency inverter of the acquisition system. The system always maintains the resonance state under the condition of variable load, and realizes efficient energy transmission; The loop control principle adjusts the phase of the voltage and current in real time. The simulative and experimental results verify the feasibility of the proposed control strategy.
Power Tower extraction method under complex terrain in mountainous area based on Laser Point Cloud data
Authors: Zhao Jian , Wang Di , Long Xin , Wu Shaohua , Hu Wei
Published: March 2020

The accurate extraction and location of pole tower point cloud in massive laser point cloud data of transmission line is the basis of airborne laser LiDAR line inspection application. In view of the current complex mountain terrain pole tower point cloud extraction depends on manual intervention, low accuracy, low efficiency and so on. An automatic extraction method of line tower point cloud based on three-dimensional grid spatial distribution feature is proposed in this paper. Firstly, the three-dimensional grid of the original point cloud of the preprocessed transmission line is divided, and the spatial distribution characteristics of the point cloud in the statistical line corridor are analyzed (point cloud density, elevation histogram, terrain elevation distribution, ground object elevation distribution). In this way, the tower point cloud is extracted, and the least square space line fitting method is used to accurately locate the tower position, so as to realize the automatic extraction and accurate location of the tower point cloud. The extraction algorithm is verified by the transmission line laser point cloud data obtained from the actual inspection of a power grid company, and the integrity of the extracted tower point cloud data is 95%, and the average positioning error of the tower position is 9cm. The experimental results show that the method has good rapidity and accuracy.
Interoperability Analysis of Resonance Compensation Network for Wireless Charging System of Electric Vehicles
Authors: Wang Songcen , Wei Bin , Zhang Hongyuan , Zhang Yanan , Jiao Chaoqun , Tong Qingbin
Published: March 2020

The compensation network of wireless charging system has many combinations, and the magnetic coupling mechanism of different network compensation combinations is usually inconsistent. How to realize matching control between power transmission and receiving devices is a key problem to the wireless charging. This paper studies the interoperability of different topologies of wireless charging system compensation network, and deduces the transmission characteristics of typical and complex topologies. A simulation model of resonant topology is established, which can simulate the switching of primary and secondary topologies in practical application scenarios. The changes of transmission and load characteristics of the system are analyzed, the interoperability of different topologies is evaluated, and suggestions for the production of wireless charging equipment are put forward.
Joint planning of distribution network and substation considering the effect of electric heating load
Authors: Zhang Zhi , Liu Jingxiong , Duan Xi , Zhang Yanhui , Zhao Haibo , Sun Chongbo , Yi Yinsi , Li Qi
Published: March 2020

A joint planning method for distribution network and substation considering the influence of electric heating load is proposed based on LCC in this paper. A multi-state model of electric heating load level is obtained by state sampling combination of ordinary load and electric heating load according to Monte Carlo method (MCS). Taking line investment cost, operation and maintenance cost, adjustable capacity transformer investment cost, operation cost, network loss cost and user outage loss cost as objective functions, a joint planning model of distribution network and substation considering the influence of electric heating load is established. The multi-objective optimization problem is transformed into a single-objective optimization problem by weighting, and solved by genetic algorithm with mixed chromosome coding. The simulation results show the effectiveness of the proposed method.
Performance analysis of 600 MW high sulfur coal unit desulfurization unit reform under ultra-low situation
Authors: Liu Xiaomeng , Wang Renlei , Zhang Ran , Liu Bo , Yao Jie
Published: March 2020

The 600MW high-sulfur coal desulfurizers in a power plant in southwest China adopt the single-tower 5-layer spray limestone wet desulfurization process. However, the change in the quality of coals initiated the need for capacity expansion. A renovation by adding two layers of sprays brought significant improvement to the performances, with the SO2 concentration at the outlet remaining below 400mg/m3. In response to the government’s call for ultra-low emission, the plant set up another renovation by constructing a new absorb tower, turning the 7-layer spray to an arrangement of 4+5 dual tower spray so as to lower the concentration of inlet SO2 from 12000mg/m3 to below 35mg/m3 through dual-tower desulfurization. The performance indexes of the two renovations were compared comprehensively, revealing that the gypsum is of poor quality and the content of fog drops at the outlet of desulfurizer is high. The paper also offers suggestions for optimized operation of desulfurizers.
Optimal Configuration of Power Supply of Microgrid based on Bilevel Layer Programming with Renewable Energy Preferred
Authors: Li Zhuonan , Wang Xiaochen , Zhao Zhiqiang , Li Haifeng , Song Xinfu , Zhang Zengqiang , Peng Sujiang
Published: March 2020

For the region where the renewable energy sources are more abundant and the requirement of load on power supply reliability is lower, a bilevel programming model giving priority to renewable energy is proposed, which takes environmental friendliness and economy into account. The lower level giving priority to renewable energy, which aims at maximizing the renewable energy power generation capacity, determines the size of renewable energy; The upper level ensuring the reliability of the system, which aims at minimizing the cost of the whole life cycle including the system initial investment, operation maintenance cost, fuel costs, environmental penalty cost and government subsidies, ultimately determines the optimal capacity configuration of different power sources in the system. Then a hybrid algorithm that combines the genetic algorithm with linear programming to solve this model is constructed. At last, by comparing the bilevel programming model with single layer and single target programming one, the validity and rationality of the model are fully verified, and the influence of the renewable energy penetration power limit, the cost of renewable energy units and the local climate factors on the optimization results are evaluated too.
Penetration level Permission for DG Considering Transmission-Distribution-Coordination
Authors: Ren Zhichao , Wang Xi , Ye Qiang , Wang Xiao , Hou Lan
Published: March 2020

With the rapid development of distributed power supply such as photovoltaic and fan, the coupling relationship between transmission network and distribution network is greatly enhanced, which also puts forward higher requirements for collaborative management and scheduling of transmission and distribution network. For this reason, this paper proposes a method to calculate the maximum access capacity of distributed generation considering the cooperation of transmission and distribution. First of all, based on the global optimization model of transmission and distribution, considering the characteristics and similarities and differences of the transmission and distribution network, this paper defines the model variables, builds the calculation model of the maximum access capacity of the distributed power supply considering the transmission and distribution coordination, uses the heterogeneous decomposition algorithm to solve the optimization model, and obtains the maximum access capacity of the distributed power supply. The results show that the proposed model has high accuracy and good convergence performance, and it has engineering application value.