bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of Fulvic Acid on Photosynthetic Characteristics of Citrus Seedlings Under Drought Stress
Authors: Huang Shengjia , Xiong Bo , Sun Guochao , He Siya , Liao Ling , Wang Jiaqi , Wang Bozhi , Wang Zhihui
Published: May 2020

The experimental material in the experiment was citrus seedling of Huangguogan. An experiment was conducted to study the effects of fulvic acid on photosynthetic characteristics of citrus seedlings under drought stress. Portable photosynthesis meter (L1-6400) was used to determine net photosynthetic rate and chlorophyll fluorescence. The results showed that the Pn in citrus seedlings spraying with 200, 400, 600 mg ·L-1 fulvic acid was higher than that in control group, which increased with the increase of concentration of fulvic acid. With the increase of fulvic acid concentration, the F
o, F
m, F
v, qP, F
v’/F
m’ in PSII and NPQ in citrus seedlings all increased significantly, while the F
o
/F
v in PSII showed an opposite regulation pattern.
Comparison of fruit quality between “Shiranui” and “Jinlegan”
Authors: Zhong Shuai , Huang Jinqiu , Fan Ya , Wang Hairong , Wang Xun
Published: May 2020

“Jinlegan” is a new bud mutation of “Shiranui”, and it has different qualities. In this experiment, their fruit weight, net fruit weight, tare weight, cross diameter, longitudinal diameter, navel height, single valve weight and skin thickness were analyzed, and the contents of soluble sugar, titratable acid, and edible rate in both hybrid citrus were determined. The results show that compared with “Shiranui”, “Jinlegan” enjoys lower titratable acid content, and more edible rate, net fruit weight, single valve weight. In conclusion, “Jinlegan” has unique flavor, commodity value and a broad market.
Development of key components of wheel tractor driving simulator based on desktop virtual reality
Authors: Liu Changxi , Chang Chuanyi , Hu Jun
Published: May 2020

The wheel tractor driving simulator was developed by using desktop virtual reality technology to solve the problems of short training times and complex operation for drivers, which led to machine damage and low efficiency when the wheel tractor was used. Firstly, the composition of the tractor driving simulator and its working principle were presented. Secondly, combined with the obtained parameters and operation requirements, the key components of the wheeled tractor driving simulator were designed. Finally, the high-degree simulation of the wheeled tractor driving simulator was verified by comparing the parameters of the key components of the real tractor with those of the wheeled tractor driving simulator. The test results showed the stroke angle and feedback force of the simulator were basically the same as that of the real tractor and they had the same trends. Therefore, the key components of the wheeled tractor driving simulator designed in this paper can simulate the driving body sense and operational functions of real tractors. The development of a driving simulator is of great significance to train unqualified drivers, improve training efficiency and reduce training cost.
Comparative Study on Biological Characteristics and Fruit Quality Changes of Two Citrus Varieties
Authors: Chen Zhaofang , Wang Yuxin , Wang Tie , Li Sichen , Xiong Bo , Qiu Xia , Sun Guochao , Wang Zhihui
Published: May 2020

This experiment compared the phenophase, morphological features and fruit quality of the two citrus varieties. The results showed that the whole growth period of Lemon Siranui was about 12 days longer than Siranui. The flowering period, two physiological fruit drop periods and fruit color change period of Lemon Siranui were about 5-7 days later than Siranui. While this study illustrated differences in morphological features that Lemon Siranui tree was stronger than Siranui. And the fruit of Lemon Siranui was heavier than Siranui. It was clear to see that the percentages of soluble solids as well as vitamin C in Lemon Siranui were larger than those in Siranui, which led to better taste qualities. Overall, Lemon Siranui was a new high-quality strain citrus variety with excellent traits which was worth promoting from the analysis of appearance quality and nutritional quality.
Effects of planting density on diurnal variation of microenvironment in Huangguogan orchards
Authors: Dong Tiantian , Tang Xiaoyu , Zhang Huiyi , Wang Bozhi , Zhang Haonan , Duan Changwen , Wang Jiaqi , Wang Zhihui , Xiong Bo
Published: May 2020

In this experiment, Huangguogan was used as the material. The effects of different planting densities on the diurnal variation of microenvironment in citrus orchard was studied, and thekey research findingsare as below. The orchard environmental factors, including light, daily average temperature and soil moisture, increased with the decrease of planting density. Compared with the density of 2×3m, thephotosynthetically active radiation(PAR in short), air temperature, soil temperature and soil moisture of density 4×5m on average increased by 423.7%, 5.5%, 2.18% and 4.9%. Air CO2 concentration and air humidity on average decreased by 1.8% and 4%. The daily range of PAR, air temperature, air humidity, soil temperature and soil humidity increased, and the daily range of air CO2 concentration decreased.
ID3 algorithm and its improved algorithm in agricultural planting decision
Authors: Qiang Guangping , Sun Lin , Huang Qiang
Published: May 2020

With the advent of the era of 5G big data, it is not only necessary to mine valid data in mass information, but also to classify it. Mining and classifying information can be used as an important basis for decision making. Making correct and efficient decisions on agricultural planting can not only improve agricultural production efficiency, but also lay the foundation for the realization of smart agriculture. This paper will compare the improved algorithm, which is called MIND, with the algorithms in other literaturesby experiments. Through calculations in agricultural big data such as temperature, humidity, wind, and weather, it is demonstrated that the improved algorithm is more suitable for agricultural planting decisions.
Effects of DifferentAmino Acids on Physicochemical Properties of Rice Starch
Authors: Qiu Zhongwen , Feng Xiaoguang , Sun Meiling , Chen Xiangning
Published: May 2020

In this study, we investigated the effects of different amino acids (Glycine acid (Gly), lysine (Lys), arginine (Arg),aspartic acid (Asp) and glutamic acid (Glu)) and different levels of amino acids (1 %, 5 %, 10 %) on the physicochemical properties(transparency, supernatant, solubility, swelling, freeze-thaw stability) of rice starch. The results showed that Lys and Arg significantly increased the swelling power of rice starch, but Asp and Glu had the opposite effect. All charge-carrying amino acids reduced the transparency of rice starch, while increased the settling property and the syneresis of freeze-thaw treatment process. Gly had no significant effect on the properties of rice starch.
Research on Interactive Fault Reasoning of Complex Agricultural Equipment by IETM
Authors: Meng Lirong , Ma Yongqi , Cheng Xun
Published: May 2020

As the equipment of modern agriculture becomes more and more complex, fault reasoning and fault maintenance support have turned into two important core functions. And how to improve the fault reasoning task success rate is an unavoidable problem for Interactive Electronic Technical Manual (IETM) that has been used in modern agriculture support information. Aiming to solve the poor interactive, inaccurate location, one-sided guidance problems in fault reasoning and fault maintenance of complex agricultural equipment, we use process data module and fault data module to describe the fault and full process for fault diagnose, fault reasoning and fault maintenance, and then according to interactive fault reasoning principle based on process data module and fault data module to guide fault maintenance staff complete fault reasoning, isolation and maintenance in shorter time. As a result, this is a new approach to improve the accuracy and efficiency of fault remedy and maintenance, and it also improves the efficiency of fault reasoning of complex agricultural equipment by IETM in an interactive way.
Soil texture judgment based on digital experimental field
Authors: Wei Jing , Dong Qiguang , Sun Zenghui
Published: May 2020

At present, it is very common to use Mastersizer 3000 to detect soil texture, which can be detected by dry method and wet method. In order to distinguish the consistency of the results of the two detection methods, the dry method and the wet method were used to test 8 samples from the pot experiment, and each sample was tested repeatedly for 3 times. The results were averaged. The content of clay ( < 2 μm) and sand (50-2000 μm) in dry method was lower than that in wet method in all samples. The particle size distribution of dry method and wet method was significantly correlated, with a determination coefficient R2 of 0.9222. Therefore, in this project area, the model can be used to simulate the particle size distribution range of wet method and determine the mechanical composition.
Study on the accumulation of Phenols during fruit development of two Pomelos
Authors: Wang Bozhi , Dong Tiantian , Wang Jiaqi , Wang Huaer , Ma Mengmeng , Li Huizhi , Zhang Yue , Yang Zirui , Zhang Yu , Xiong Bo
Published: May 2020

This experiment usedHuangjinmiyou and Sanhongmiyou as materials to studythe accumulation of phenolic substances during fruit developmentin different parts of pomelo fruit (exocarp, mesocarp and pulp) via Folin-Ciocalteuassay. The results showed that the total phenolic content (TPC) of Huangjinmiyouwas slightly higher than that of Sanhongmiyou.The sequence of TPC in different parts of the fruit wasmesocarp> exocarp>pulp. TPC of the three parts reached maximum on the 60th day. The experiment aimed at two popular varieties showed their normal rules of phenols changing during fruit development and their differences, which consummated relevant theories.
Study Progress of Intelligent Facility Feeding Technology for Broilers
Authors: He Ling , Chen Changxi , Wanchao Zhang , Wu Kai , Zhen Aijun
Published: May 2020

Some progress has been made on the intelligent facility breeding of broilers in China and international. Contents and achievements of the research are concentrated in two aspects. One is the control of breeding environment, and the other is the recognition automatically of broiler state. The research achievements in these two aspects were summarized, and the application status and prospect of these research achievements were analyzed in this paper, which would provide reference for the development of intelligent broiler feeding.
Simulation Study on Irrigation Water Consumption of Multi-Source Irrigation Area based on Water Monitoring
Authors: Jinhua Wen , Helong Wang , Shiwu Wang
Published: May 2020

The simulation accuracy of irrigation water consumption in multi-source irrigation area is not high. SWAT model water cycle simulation structure and calculation of water balance elements are not suitable for irrigation district water cycle simulation. This paper puts forward a method of building water measurement and monitoring facilities in the main water circulation nodes of irrigation area, combining with the improved SWAT model to establish water circulation model to simulate agricultural water consumption in irrigation area. This method effectively realizes the combination of direct measurement and model calculation of agricultural irrigation water consumption in multi-source irrigation area.
The Establishment of Cherry Tomatoes Evaluation System
Authors: Chang Xiyuan , Wang Guoqiang , Chang Xiguang , Zhao Xin , Feng Xiaoguang , Chen Xiangning
Published: May 2020

In this study, cherry tomatoes were selected as research objects, and the characteristics of sensory indicators, nutrition indicators, physiological and biochemical indicators, microbial indicators and harmful chemical substances were selected during the shelf life. Finally, the key evaluation indicators and indicators were determined by SPSS software analysis. The establishment of a cherry tomato quality evaluation system provides a theoretical basis for extending the shelf life of cherry tomatoes. The evaluation system was as follows: principal component 1=-0.472578778 sensory +0.451205869 total colony +0.453105683 weight loss rate -0.434582494 hardness +0.422708656 lycopene. This study has positive significance on the preservation of cherry tomato.
Effect of biochar application at different adding rates on garlic (Allium sativum) growth and production
Authors: Zhang Chenchen , Liu Qiang , Kudakwashe Meki
Published: May 2020

Biochar is a solid and carbon-rich product obtained from the thermal treatment of biomass, which have been widely used in agricultural production and environmental remediation. However, it is unknown whether biochar addition have positive effect on the growth and production of garlic (Allium sativum), an important edible vegetable in China. Thus, we investigated the effects of a wood wastes derived biochar addition at rates of 1.5% and 3% (w/w, 1.5%BC and 3%BC) on the germination, growth, and production of garlic using a pot experiment. The results showed that 1.5%BC significantly increased the weight of fresh roots by 29%, indicating that the 1.5%BC promoted the garlic production. However, the higher dosage treatment (3%BC) slightly inhibited the seedling growth, and decreased the garlic production. Our findings provide useful information for developing biochar-based technology to improve garlic production.
Effect of Peeling Method on The Volatile Flavor of Citrus Fruit
Authors: Wang Jun , Cheng Yujiao , Huang Linhua , Wu Houjiu , Sun Rongrong , Li Guijie
Published: May 2020

Analysis on the volatile flavor of whole peeled citrus fruit with different peeling methods, by solid phase micro extraction-gas chromatography-mass spectrometry (SPME-GC-MS). Totally 50 aromatic components were found, and main components were as follows: limonene (69.32%-78.88%), valencene (8.14%-12.98%), α-pinene (1.01%-1.02%), γ-terpinene (0.27%-0.35%), 3-methyl-butanal (0.75%-1.10%), (E)-2-hexenal (0.47%-0.73%), 1-octanol (0.25%-0.50%), linalool (0.70%-2.16%), ethyl butyrate (0.28%-2.59%), ethyl caproate (5.39%), ethyl acid ethyl ester (0.29%-1.86%), geranylacetone (0.07%-0.25%). The volatile flavor components of the three treatments were 34, 36 and 50, respectively. Enzymatic peeling method was used for detection oxidation of limonene, (E)-2-hexenal flavor. Conventional (artificial) peeling method was used detection oxidation of limonene, (E)-2-hexenal flavor, ethyl hexanoate, hexyl butyrate flavor.
Hydraulic extension ability of radial jet drilling with multi-nozzles jet bit
Authors: Qin Dawei , Liu Quanwen , Wu Qilin , Huang Shen
Published: May 2020

Radial jet drilling technology, which utilizes hydraulic energy of jet to create multiple radial micro-laterals in different layers from the main borehole, has been used widely as an effective approach to enhance the oil recovery, and the extreme extension length of radial micro-laterals affects the effect of simulation directly. However, the prediction model for hydraulic extreme extension ability of RJD has been rarely studied. In this study, a modified model for hydraulic extreme extension ability is proposed based on the force analysis of RJD system and related calculation models for frictions are developed by theoretical and experimental methods. In order to obtain the maximum extension length, the influential factors including flow rate of drilling fluid, specifications of flexible hose, and structure parameters of jet bit are investigated. The results indicate that the hydraulic extension ability of RJD presents a significant positive correlation with the flow rate of drilling fluid and the inner diameter of flexile hose. Although an increase of the number of backward nozzles or its diameter can improve the extreme extension ability of RJD, there is still an optimal value for both the number and diameter of backward nozzles. Without sacrificing the rock-breaking and expanding ability of jet bit, the number of forward nozzles and the angle of backward nozzles should be minimized. Furthermore, a field case of RJD proves the prediction model is favourable for drilling engineering, with a model error of less than 8.5%.
The Study on Extraction Technology of Essential Oil from Tribute Citru
Authors: Wu Ya , Chen Guangfang , Liu Bihui , Zhao Xin
Published: May 2020

The essential oil from Tribute Citru peel was extracted by steam distillation. The extraction method was studied by single factor test and orthogonal test. According to the experiment results, the order of influence was: distillation time, sodium chloride solution concentration, soaking time, material-liquid ratio. The optimum condition determined by orthogonal test was 3.0% sodium chloride solution in the solid-liquid ratio of 1:16 and distillation time was 1.5h without soaking. Under this condition, the extraction yield of essential oil from Tribute Citru peel reached 9.29%.
Rock typing from cored intervals to all wells with method of decision tree
Authors: Wang Xinglong , Li Chen , Chen Peiyuan
Published: May 2020

Rock typing is a fundamental work in geology study of oil and gas field. Generally, it is difficult to define a quantitative relationship to expand the classification from cored intervals to all wells with the traditional method based on geologic origin analysis, when rock of complex pore structure is confronted. On the basis of conventional core analysis and well logs, the authors propose a workflow to extend rock typing from cores to all wells with the method of decision tree. In the study case of F oilfield from Middle East, the method and workflow not only predict the rock type on wells, but also get satisfying precision of permeability impetration. Therefore, when data used to quantify pore structure is scare and traditional rock typing method is impossible, the method and workflow founded on decision tree could be a universal alternative.
CNN Based Fault Recognition with Multi-Scale Fusion Attention Mechanism
Authors: Wang Bo , Ma Jinwen
Published: May 2020

In geological exploration, seismic data interpretation is very important and its key task is fault detection or recognition. In fact, the accurate recognition of fault shape and distribution plays an important role in oil and gas exploration. With the increasing demand of fault interpretation accuracy in oilfield, traditional manual fault interpretation methods are susceptible to subjective factors of interpreters. With the rapid development of deep learning technique, convolutional neural networks (CNNs) has successfully applied to the complicated tasks of image classification. This paper utilizes proposes a CNN based fault recognition framework with a multi-scale fusion attention mechanism. It is demonstrated by the experimental results that our proposed approach is superior to the traditional methods on both the fault interpretation accuracy and efficiency of 3D seismic images, greatly reducing the risk of oil and gas exploration and development. With a GeForce GTX 1080 GPU, the training processing takes about 4 hours and predicts the faults in a 33×33×33 seismic volume using only tens of milliseconds.
Risk Assessment of Debris Flow in Longchi Area of Dujiangyan based on GIS and AHP
Authors: Xiao Hai , Tang Xingsheng , Zhang Hongtao
Published: May 2020

In this study, a combination of analytic hierarchy process (AHP) and geographic information system (GIS) was used to analyze and obtain remote sensing images and digital elevation models (DEM) in the area through field surveys. The seven factors of rock layer type, vegetation cover index (NDVI), slope, height, fault influence zone, river influence zone and highway influence zone were selected. The purpose is to study the distribution range and law of debris flow at different levels in the area. The results show that the area is a highly prone area for debris flow for sand-mud interlayer and NDVI less than 0.10, the slope between 30 ° and 45 °, the height between 950-1300 meters, the fault impact zone within 400 meters, the river within 100 meters on both sides of the river, and the highway is 75 meters on both sides.
Research on Iterative Calibration Method of Linear Model Parameters of Gravity Sensor
Authors: Lu Shuhai , Cao Juliang , Shaokun Cai , Yu Ruihang , Yang Bainan
Published: May 2020

In recent years, the calibration method of Strapdown gravimeter has become the bottleneck of relative gravity measurement accuracy. Based on this situation, this thesis studies the parameter iterative calibration method of SGA-WZ03 strapdown gravimeter to break the bottleneck of relative gravity measurement and further improve the measurement accuracy of relative gravimeter in flight experiment through the improvement of calibration method Degree. The parameter iterative estimation algorithm is based on the pulse output model of a single accelerometer to establish the linear pulse output model of the accelerometer components. Using the idea of parameter separation, the two-step iterative estimation of the model parameters and the tilt vector can complete the calibration of the linear model and the secondary model of the accelerometer. Compared with the traditional 24 bit calibration method, the parameter estimation iterative estimation calibration method has better stability than the traditional method.
Analysis of Design Rainfall Depth in Sponge City Construction — a Case Study of Hefei, China
Authors: Song Xinwei , Tu Youxiao , Chai Luxiu
Published: May 2020

The design rainfall depth is an important parameter in the construction of sponge cities. Based on the analysis of 39 year daily precipitation data in Hefei city, this paper concludes that the inter-annual and intra-annual distribution of precipitation in Hefei is uneven. Based on the comparison and analysis of volume capture ratio of annual rainfall calculation method and rainfall percentage control calculation method for design rainfall depth, it is proposed that the designed rainfall in Hefei should not be too high, and it provides suggestions for the construction of the sponge city in Hefei.
Insects and ecosystem characteristics of the Shuinan Formation in Laiyang Basin
Authors: Liu Hongliang , Qin Peng , Liang Zhihao
Published: May 2020

Since 1923 to 2006(84 years), many insect fossils have been found and reported from Shuinan Formation in Laiyang basin. The researchers included Grabau, Ping Zhi, Hong Youchong, Zhang Junfeng, Wang Wenli, Yang Jikun, et al. The insect group from Shuinan Formation consist of terrestrial and aquatic insects, most of it is terrestrial insects. Its represent-ative species are: Chironomapteria gregaria, Mesolygaeus laiyangensis, and Coptoclava longipoda. By contrast, the era of Shuinan Formation is Early Cretaceous Epoch. According to the statistics, the insect fossils have 12 orders, 67 families, 131 genera and 161 species, thereinto, 5 genera’s familiae incertae sedis. The dominant insects were Diptera, Coleoptera and Hymenoptera, which were obviously different from the present ones. There are four levels of food chain among insects: plants (producers) - primary consumers - level two predators - level three predators. According to fossil insects and the other biology fossils from Shuinan Formation, this paper analyzes the ecological characteristics of the ancient Laiyang basin at the time. It provides the foundation for the protection of insect fossils production in Laiyang basin and the construction of the Cretaceous National Geopark in Laiyang City Shandong Province.
Sedimentary structure characteristics and depositional facies of Paleogene Es4 in Dongying Sag, Jiyang Depression, Bohai Bay Basin, China
Authors: Meng Xu
Published: May 2020

Through recognizing the characteristics of sedimentary structures in the cores, the sedimentary facies of Paleogene Es4 in southern slope of Dongying Sag were recognized. The sedimentary structures included bedding, bed plane structure, contemporaneous deformation structure, and biogenetic structure. Finally, the sedimentary facies, consisting of braided-river delta, alluvial fan, beach dam, and lacustrine, were recognized, which would not only contribute to the petroleum exploration and development in the initial period of Dongying Sag, but also help carry on the basin analysis of the rifted basins.
The application of vibroseis in VSP logging in Sichuan and Chongqing area
Authors: Ge Li , Tang Jian , Zhang Li , Yong Jie , Kang Liang
Published: May 2020

In 1970s, vibroseis was introduced to do seismic exploration in China. After then, vibroseis equipment was researched and produced in China. The electro-control system of the force working on the ground, of vibroseis signal recognizing or installing, and of RT quality-controlling, which is based on the digital self-adapting method, enlarged the application of vibroseis not only the areas but also the quantity in seismic exploration. And then, vibroseis equipment became one of the important seismic equipment. As the producing of shale gas developed, and the traffic conditions improved, the vibroseis equipment and techniques began to work in VSP logging in Sichuan and Chongqing area, south-west of China. The effect of the vibroseis in VSP logging will be analyzed from the theory to the consistence and high S/N ratio of VSP data which be acquired by vibroseis.
Analysis the Influence Factors and Deviation of Gas Outflow in Resumed Mine
Authors: Dong Wang , Hong Ding
Published: May 2020

In view of the problem of insufficient wind distribution basis during recovery, on the basis of analyzing the influence factors of gas outflow in the resumed mine, the research object is taken by the Limin coal mine in Hunan Province, and the gas excitant quantity prediction and deviation analysis are carried out in different production periods when the mine is produced by the source and statistics method. The results show that the mine relative gas outflow prediction error is 6.98 to 19.96 percent, controlled by coal seam thickness and gas content, mining depth geological conditions and other natural factors, while the mine absolute gas outflow prediction error is 20.89 to 44.01 percent, controlled by mining technology factors such as mining scale, recovery schedule and shutdown time.
Application of Directional Long Borehole Technology in Working Face of Thick Coal Seam Along Top Driving
Authors: Shi Yongtao
Published: May 2020

With the increasing of gas content in a coal mine in Shanxi Province, when the coal seam roadway is driving along the top, the extraction effect of ordinary borehole is not good under the complicated geological condition of high gas content and thick coal seam. The traditional “step type” gas control method of ordinary borehole has seriously affected the mine excavation replacement and safety production. In view of the existing problems of gas control in mine heading face, this paper introduces the technology of long directional borehole extraction. Through the field test, investigation, comparison and analysis, the tunneling speed of the tunnel is increased from the original 150m / month to 240m / month; compared with the safe excavation of the 400m roadway, the directional long borehole extraction process was 37 days faster than the traditional ordinary borehole extraction process; the gas concentration in the working face and return air flow was reduced by about 0.3% on average, which greatly reduced the ventilation pressure during the excavation and ensured the safe excavation of the working face. Finally, the extraction technology and parameters of the long directional borehole along the heading face of the thick coal seam are investigated.
Study on energy productivity of patent-intensive industries
Authors: Yuan Qian , Wu Lihua , Zhang Ping
Published: May 2020

Based on the panel data of patent intensive-industries from 2007 to 2016, this paper utilized the Biennial Malmquist-Luenberger (BML) productivity index method to measure and decompose the energy efficiency. The results showed thatthe energy efficiency of patent-intensive industries showed growth trend on the whole and its growth rate was higher than non-patent-intensive industries and the overall industry. Besides, the contribution of structure effect (SE) was the largest and that of total factor productivity (TFP) was the least.Moreover, different industries had different sources of energy efficiency growth. For most industries, technical change (TC), labor-energy substitution effect (LE), and output structure effect (OSE) increased energy efficiency. Therefore, it is necessary to further accelerate the pace of energy conservation, optimize the industrial structure, promote technological progress, and increase the substitution effect of labor on energy for patent-intensive industries.
Sensitivity Analysis of System Deviation of Swing Drive Test Device in Motion Conditions
Authors: Wang Xiaoyan , Gong Zili , Yu Shengzhi
Published: May 2020

The swing test device is a complex electro-mechanical-hydraulic system. The test body floats on the water and is swayed by the hydraulic traction devices on both sides of the pool. The precise control of the test body’s motion state by the hydraulic control system is affected by various external factors. Among them, the manufacturing equipment dimensions, test body weight and shape tolerances, and installation error of the equipment have a particularly serious influence on the control. Through the sensitivity analysis of external interference factors, this paper provides useful reference for device manufacturing, installation, operation, safety strategy, human factors control, etc.
The mechanism of additives to unsupported Ni-Mo hydrodesulphurization catalyst
Authors: Yan Shi , Su Feiming , Wang Xiaoqiang , Yao Zhiwei , Liu Jiaming
Published: May 2020

A series of highly active unsupported Ni-Mo hydrodesulphurization catalyst prepared by coprecipitation method and characterized effect of additives Al2O3 on the structure performance by BET, and Py-IR tests. The results indicated the additives Al2O3 greatly increased the pore diameter and specific surface area and mechanical strength. And it increased the acid of L acid while formatted B acid sites. This paper also characterized the influence of phosphorus to the Ni-Mo catalyst. BET results show that phosphorus blocked the catalyst pore structure, specifically reduced the surface area of the Ni-Mo. But TPR, FT-IR studies have shown that phosphorus can form Al-P-O structure, weaken interaction between active phase and Al2O3, while the amount of tetrahedral Mo species was decreased and octahedral Mo species was increased.
Analysis on Peak-shaving Energy Efficiency of Thermal Power Plant with High Temperature Thermal Energy Storage
Authors: Zhang Hongwei , Liu Junqing , Liang Wenbin , Yu Dong
Published: May 2020

Integration of energy storage infrastructures into electrical grids represents a crucial milestone in the transition towards energy systems with high penetration of renewables. However, the high cost of the currently available technologies is a significant barrier for their implementation on the industrial scale. High temperature thermal energy storage systems, in combination with bottom steam cycles, are being investigated as potential cost effective alternatives to traditional large-scale energy storage technologies. In this study, by adding a high temperature heat storage device in the cold (hot) section of the reheating pipeline and taking the 300MW extraction steam turbine as the research object, it is concluded that the introduction of the high temperature heat storage device can improve the consumption of wind power and greatly reduce the power supply of the coal-fired unit. The coal consumption rate is analyzed. The ideas and methods for solving the energy consumption of the renewable energy and reducing the peak energy consumption are provided.
Research on the Computer-based Excel Program on Fuel Changeover and Energy Consumption in ECA (SECA)
Authors: Li Feifei , Dang Kun , Song Dongdong
Published: May 2020

Upon entry into force of Annex VI to MARPOL on the 19th May 2005, the sulphur oxide (SOx) emissions from ships are controlled by setting a limit of 3.5% on the sulphur content of marine fuel oils[1]. The computer-based excel program on fuel changeover and energy consumption is specifically formulated to assist the engineers regarding how to obtain the time required as well as the fuel consumption during the changeover of fuel oil. It shall be utilized effectively when preparing the plan for the fuel changeover when vessel is to enter ECA/SECA.Therefore, the calculation of fuel changeover in ECA (SECA) is critical.
Study on Protection of Xinghu Wetland in Zhaoqing
Authors: Zhang Hong
Published: May 2020

Zhaoqing Xinghu Wetland is a city center wetland. Due to the recent urban development and a lack of supplementary water resources, the landscape pattern of Xinghu Wetland has changed, and the original ecosystem services of the wetland have been degraded. From the perspective of landscape ecology, referring to the Steinitz landscape design method, this question is problem-oriented, asks questions, collects data, and then analyzes the solution to the problem, explores the ecological restoration of Xinghu wetland, partitions the wetlands, and organizes the protection planning in stages. Focus on water environment treatment planning, reduce human interference, and let nature do the work. The implementation results show that the ecological environment of Xinghu Wetland has been effectively restored, and the Steinitz landscape design method has important reference value for ecological landscape design.
Linear Discriminant Analysis and Adaptive Neuro-fuzzy Inference System Development of Gas Insulated Substation
Authors: Meng Dedong
Published: May 2020

In this study, a PD defect identification system based on linear discriminant analysis and adaptive neural-fuzzy inference system is developed. The partial discharge signs of the typical defects of GIS were measured with a measuring device. The corresponding characteristic parameters extracted from the gs were then filtered according to the optimization algorithm and stored in the form of three-dimensional discharge mode(q-φ-t). After that, the 3D discharge mode is transformed into statistical parameters. Statistical PD features can be used for defect classification purposes, but are obvious. Processing such a large database would be inefficient for that purpose. Therefore, it would be very helpful to select those features that are more effective and more efficient to identify and distinguish potential PD defects through their relevant statistical parameters. Select feature extraction techniques for dimensionality reduction. In solving pattern classification problems, feature extraction methods are usually used as pre-processing techniques, which can not only reduce the computational complexity, but also achieve better classification performance by reducing irrelevant and redundant information in the data.
Research progress of indoor air purification technology
Authors: Qiao Chunzhen , Ji Kai , Zhang Zhen
Published: May 2020

Filtration, adsorption and photocatalysis are widely used in the purification of indoor air pollutants as three commonly used air purification methods. The methods to improve the purification efficiency of air purifiers and the factors affecting the purification efficiency have been widely studied. This paper briefly describes the main purification principles of the three air purification technologies and reviews the influence of filter size, filtration wind speed, particle size, particle size of adsorbed material and filling amount on purification efficiency and the amount of clean air produced by photocatalysis. Coupling the use of single purification technology with other new building technologies, as well as simplifying the regeneration process of adsorption and catalytic materials, and achieving the recycling of filter materials are the future research directions.
Determination of the total petroleum hydrocarbons in aquatic products by fluorescence spectrophotometry
Authors: Ye Hongli , Tian Liangliang , Shi Yongfu , Yu Huijuan , Cai Youqiong , Xi Yanfeng , Tang Yunyu , Zhang Zhengquan , Huang Dongmei
Published: May 2020

The paper studied the determination of total petroleum hydrocarbon (TPHs) in aquatic products by fluorescence spectrophotometry method. To be suitable for the detection of TPHs in various aquatic products, the pretreatment conditions of the approach were optimized, such as the saponification temperature, saponification time, the adding order of anhydrous ethanol, the addition amount of extraction agent. The established method showed a good linearity in the TPHs range 0.0 ∼ 40.0 μg/mL (R2 = 0.9965) with the limit of detection (LOD) 1.36 μg/mL and the precision of 6.1 % (relative standard deviation, RSD). The addition standard recoveries were 72.8 % ∼ 88.4 %. Finally, the method was successfully applied in detection of TPHs in the various aquatic products.
Study on determination of titanium in Ni-Ti-Nb shape memory alloy by diantipyrylmethane spectrophotometry
Authors: Dai Yichun , Tian Lunfu , Zou Deshuang , Cao Shicao
Published: May 2020

Titanium was one of the main chemical components in Ni-Ti-Nb shape memory alloy. It has high content, narrow range and requires high precision of analytical method. In this study, diantipyrylmethane spectrophotometry was established for the determination of titanium in Ni-Ti-Nb shape memory alloy. The method major interference factors such as dissolve sample, absorption curve and the condition of color reaction were investigated and the analysis conditions of determining titanium were experimentally determined. Beers law was obeyed in the concentration range of 0mg/L ∼ 9.0mg/L of Ti. The relative standard deviation of was below 0.3% for the samples (n=6).
Comprehensive utilization system of waste heat of hydrogen fuel cell powered ship
Authors: Xu Xingang , Wang Shihao
Published: May 2020

At present, about 50% of the energy of hydrogen fuel cells is converted into heat energy loss, and the comprehensive energy utilization technology is still immature. For the transport ship powered by proton exchange membrane hydrogen fuel cell, a set of comprehensive waste heat utilization system was designed through theoretical calculation and simulation analysis. A set of self-adaptive controllers with PLC (Programmable Logic Controller) as the core and fuzzy PID (Process Identification) control law based on the collected operating parameters and environmental parameters of each module was developed to control the input energy of each module. Based on the fuel cell-powered green ship technology, this system realizes the cogeneration of low-grade heat sources of hydrogen fuel cells, which greatly improves energy utilization efficiency. The results can promote the application of fuel cells in ships.
Study on preparation method of aircraft composite skin considering electromagnetic shielding
Authors: Yushoumiao  , Zhao Yuliang , Yu Xiangyang , Yao Linghong , Zhao Shi , Yu Chunfeng
Published: May 2020

As the airborne mission system is increasingly concentrated in a small space, airborne electromagnetic compatibility becomes worse. And the electromagnetic shielding performance of this body mechanism can be improved by blocking its radiation path. Considering the aircraft non-metallic skin properties such as strength, plasticity and resistance to corrosion, by vacuum evaporation, vacuum coating, chemical vapor deposition and dispensing under laboratory conditions and adjusting the material, layer thickness and process parameters, several examples of multiple layers of electromagnetic shielding composite materials are prepared, which has important meaning for engineering practice.
The pressure drop funnel method was used to evaluate the discharge range of each layer
Authors: Mao Zhenglin , Huang Yougen , Yuan Lin , Liu Jiaojiao , Li Qian , Jiao Tingkui , Chen Di
Published: May 2020

The east side of yulin gas field belongs to the multi-layer gas reservoir, and the dominant vertical layer is not prominent. At present, there is a lack of productivity evaluation method for single well of multi-layer system, and the scope of discharge and control factors of small layer of gas well are not clear. Based on the well pattern data, geological and test data of the eastern yulin gas field, and referring to the development experience of similar blocks at home and abroad, the production evaluation of gas Wells and control reserves evaluation of multi-layer gas reservoirs were completed, the reserve production characteristics, discharge range and control factors of multi-layer gas reservoirs were clarified, and the well spacing of well pattern was optimized.
Effect of Mental-Doped on Thermal Properties of K2CO3-Na2CO3 eutectic salt/magnesium oxide Composites for Thermal Energy Storage
Authors: Tan Hui , Zhang Gaoqun , Chang Liang , Deng Zhanfeng , Xu Guizhi , Song Xiaoyun , Cai Linhai , Han Zhibo
Published: May 2020

In this work, Na2CO3-K2CO3/MgO composites with MgO serving as supporting material and Na2CO3-K2CO3 eutectic salt acting as thermal absorbing materials were prepared by the form-stable technique. Besides, the possible effects of Cu, Fe and Al on the thermal properties of the composite were investigated. The thermal properties including phase composition, latent heat and thermal conductivity, etc. were measured using X-ray diffraction, differential scanning calorimetry, thermal constant analyzer and thermogravimetric analysis, etc. The X-ray diffraction results show that Na2CO3-K2CO3 and MgO have good chemical compatibility. The differential scanning calorimetry results show that the melting point of the Na2CO3-K2CO3/MgO composites is 707.5°C and its enthalpy of fusion is 67.98J/g. The thermal constants analyzer results indicate that the addition of metal powder can improve the thermal conductivity of the sample, but the increase rate is not obvious because of its oxidation in the air, some even reduce the thermal conductivity.
Life Estimation Method for super capacitors Used in Wind Turbine Pitch
Authors: Xiong Guozhuan , Zhang Yuechao , Zhang Jinqiang , Hu Peng , Yang Peiwen
Published: May 2020

At present, various wind farms in the industry have not established a service life based on the actual situation of super capacitors used in the wind turbine pitch system, a new method for estimating the life of super capacitors is proposed. The first step is to collect the charging voltage value and the annual temperature data value of the capacitor cabinet of a wind turbine, and then calculate the actual operation time of the super capacitor at each temperature point. Secondly, we use the life estimation formula to calculate the estimated operating life of the super capacitor at each temperature point, Finally, we use the method of life conversion to convert the actual operation time of super capacitor at each temperature point into the operation time of super capacitor at a specific temperature point in a year, and then the estimated life value of super capacitor is calculated. This new method for estimating the life of super capacitors takes into account the differences in the local environment of wind farms across the country, as well as the influence of the actual operating environment difference of each wind turbine on the life of super capacitor. The proposed method plays an important role in the regular maintenance and replacement of the super capacitor used in the wind turbine pitch system.
Effect of Xihuang Pill on microcirculation in DMBA combined estrogen and progesterone induced breast precancerous lesions rats
Authors: Li Dehui , Su Yifan , Fan Huanfang , Sun Chunxia , Han Changhui , Ma Pan , Yan Jiaojiao
Published: May 2020

Objective: To observe the effect of Xihuang Pill on microcirculation in 7,12-dimethylbenzoanthracene (DMBA) combined estrogen and progesterone induced breast precancerous lesions rats. Method: DMBA combined estrogen and progesterone were used to establish the model of breast precancerous lesions for 10 weeks in SD rats, then the low, medium and high dose Xihuang Pill (0.27, 0.55, 1.37g·kg−1) was given intragastric administration, and tamoxifen (4 mg·kg−1) was given intragastric administration as a positive control after the breast precancerous lesions models established successfully. The breast microcirculation was measured by laser Doppler flowmetry (LDF) in rats after 4 weeks of Xihuang Pill and tamoxifen intragastric administration. Result: Compared with the normal control group, the microcirculation perfusion of breast in the disease model group decreased significantly (P < 0.05). Compared with the disease model group, the breast microcirculation perfusion in each dose group of Xihuang Pill increased significantly (P < 0.05). Conclusion: The mechanism of Xihuang Pill in the treatment of breast precancerous lesions may be related to the improvement of breast microcirculation.
Research on Energy Optimization Method of Virtual Power Plant Considering Coordination and Interaction of Source-Load-Storage
Authors: Yuan Zhiyong , Huang Andi , Lei Jinyong , Gu Yanzhang , Guo Zuogang , Bai Hao , Wu Chenshuo
Published: May 2020

Developing renewable energy generation such as wind power and photovoltaics is an effective way to cope with energy shortage and environmental problems. The virtual power plant (VPP) realizes the grid-connected operation of intermittent distributed renewable energy by aggregating multiple types of distributed energy resources. In order to achieve the energy optimization problem of the VPP, an optimization method of VPP considering coordination and interaction of source-load-storage is proposed in this paper. First, models of components in the VPP are established. Next, an energy optimization model of the VPP considering coordination and interaction of source-load-storage is constructed. Finally, a case is studied to verify the correctness and effectiveness of the method. The results show that the coordinated consideration of distributed generation, energy storage and demand response loads contributes to reducing the operating costs and carbon emissions of the VPP.
Research on Optimization Method of Physical Asset Management in Distribution Network Based on BIM
Authors: Ye Lingjie , Gong Jinjin , Lao Yongchang , Jin Shaojun , Chao Chen
Published: May 2020

Under the new situation, the physical asset management of power distribution enterprises should actively adapt to the new situation of reform and development, and continue to innovate and make breakthroughs. Therefore, it is necessary to study and analyze the impact of the reform of the power system on the physical asset management of the distribution network, summarize the current status quo problems of the physical asset management of the distribution network in terms of asset formation, equipment asset linkage, value management, etc., and identify different businesses after the power reform In the scenario, the needs for physical asset management of the distribution network, with the help of advanced all-information digital model technology, promote the optimization and improvement of the physical asset management level of the distribution network, and lay a solid foundation for grid companies to actively adapt to the new situation in the market environment. “Core, market is fundamental” corporate strategy provides effective support.