bluuebunny/crossref_metadata_2025 huggingface dataset:
Study and development of emergent dispatching system for sudden water pollution accidents
Authors: Chai Fuxin , Xie Xinmin , Li Jianxun
Published: July 2020

Because of the frequent incidents of water pollution in China, the ecological environment and the socio-economic along the river are threatened seriously. In order to improve the ability of dealing with sudden water pollution accidents, the emergency dispatching system of sudden water pollution accidents is constructed by using data mining, database, GIS and other technologies combined with reservoir operation model, hydrodynamic model and water quality model. The main functions of the system include that the information management, scheme generation, simulation of water quality and quantity, emergency dispatch, and three-dimensional simulation. Applied research is carried out in Songhua River basin, which can provide technical support and decision-making platform for sudden water pollution accidents.
Study on Eco-health Evaluation of Ledum-Larixgmelinii Forest in Cold Temperate Zone
Authors: Gu Ye , Shen Penglin , Ren Guoli , Zhang Wu , Zhang Yuehua , Guan Jinqiu , Li Lan
Published: July 2020

Field surveys set standard measurement indicators, use principal component analysis to screen indicators, determine weights, construct evaluation models, and use cluster analysis to classify Durian larch forest health grades. Three types of Ledum-Larixgmelinii forest in the clearcut forest were studied for health evaluation. The results of the study show that: forest stand productivity, soil nutrients, organizational structure, resistance, and resilience have identified 19 indicators that are more important for the health of Duxiang-Xing’an larch forest. A forest health assessment index system of Ledum-Larixgmelinii forest was established. The principal component analysis method was used to select comprehensive indexes such as comprehensiveness, resilience, plant diseases, and insect pests, plant species diversity, fire disturbance degree, structural rationality, soil nutrients and natural disturbance, as the evaluation indicators of Ledum-Larixgmelinii larch forest. Although the overall health status of the Ledum-Larixgmelinii forest is generally good, there are still areas of forest with health problems. Through analysis, the primary forest has the highest health index and the best health status. It can be seen that the forest grown in the original state has a stable structure, high vitality, strong resistance, and strong sustainability. The health level of the declining forest is second only to that of the primary forest. In clearing forests, there are two kinds of clearing forests in the study area. Among them, 2/3 of the forest are poor, and 1/3 of the forest are in the middle, but the health of the clear cutting forest is the lowest overall.
A Study on the Evaluation of Urban Tourism Competitiveness in Guangdong-Hong Kong-Macao Greater Bay Area
Authors: Yang Liang , Yu Li
Published: July 2020

Aiming at the shortcomings in the existing research on tourism competitiveness, the article adjusted the regional tourism competitiveness evaluation index system and used the entropy method to quantitatively evaluate the tourism competitiveness of 11 cities in the Guangdong-Hong Kong-Macao Greater Bay Area from 2012 to 2018. The results show that the regional tourism competitiveness of Guangdong-Hong Kong-Macao Greater Bay Area differs significantly and can be divided into three levels. Hong Kong, Macau, Guangzhou, and Shenzhen generally have higher tourism competitiveness and are in the first rank; Zhuhai, Foshan, Huizhou, and Dongguan have average tourism competitiveness and are in the second rank; The tourism competitiveness of Zhongshan, Jiangmen and Zhaoqing is relatively weak, ranking third. Based on the conclusions of the study, the article puts forward relevant suggestions to enhance the tourism competitiveness of the Guangdong-Hong Kong-Macao Greater Bay Area, hoping to provide a reference for enhancing the tourism competitiveness of the Guangdong-Hong Kong-Macao Greater Bay Area and promote the construction of international tourism destinations in the Guangdong-Hong Kong-Macao Greater Bay Area.
Optimization of Extraction Process of Valeriana officinalis L. Root Essential Oil and Study on Its Anti-Free Radical Activity
Authors: Miao Tianlin , Zheng Hongjuan , Wang Xue , Lan Ying , Zhang Yuehua , Song Yujun , Li Lan
Published: July 2020

Taking Valerianrhizome as raw material and the yield of volatile oil of Valerian as an index, the extraction process of valerian volatile oil was analyzed by microwave assisted steam distillation, and optimized by Box-Behnken response surface test. The effects of scavenging capacity of Li, DPPH and hydroxyl radicals on their antioxidant capacity were studied. The results showed that the optimal process conditions of microwave extraction of volatile oil of Valerian were 350W microwave power, extraction time 25min, liquid-to-material ratio 8.8mL: 1.0g, and the yield of volatile oil of Valerian extracted under this condition was 5.88%. Microwave-extracted volatile oil of Valerian has strong scavenging ability and high reducing power to DPPH free radicals and hydroxyl free radicals. Compared with steam distillation, it has obvious differences, which can provide reference for the development of antioxidant products of Valerian oil.
Study on the Influence of Premix Uniformity on NOx Emission Concentration in 9E Gas Turbine Combustion Chamber
Authors: Ding Yang
Published: July 2020

In this paper, a numerical simulation is performed on the basis of a combustion chamber of 9E gas turbine, to study the effect of premix uniformity on the NOx emission concentration. The results show that when the 9E gas turbine is working under the baseload with a fuel flow ratio of the primary nozzle R
fuel deviates within an optimal interval of 78 % to 84 %, an increment in the number of secondary nozzle fuel injection points leads to a decline in NOx emission concentration. Since purge air nozzles of DLN are placed in upstream of swirl generator while the nozzles are placed downstream of swirl generator in LEC, the impact of the purge airflow rate on the NOx emission in the DLN has an opposite trend with that in the LEC. Besides, the increment of the mixed air proportion R
air leads to a distinct enhancement in the local equivalence ratio peak value of the primary combustion zone outlet. Also, the distribution of the equivalence ratio changes. The NOx emission concentration is influenced as a result.
Analysis on the Influence of Different Setting Conditions on the Short Circuit Current Calculation Results of PSD-SCCP
Authors: Wu Jianbin , Zheng Xiaoming , Gao Yi , Zhao Haibo , Wu Zhong , Wang Peng
Published: July 2020

The result of power system short circuit calculation and verification is important reference for power system relay protection, electrical automatic device setting, transient process research, electrical planning and design and equipment selection. In the process of short circuit calculation, different conditional combination mode may lead to different results. The aggressive conditional combination mode will lead to the decline of power grid security performance, on the contrary, the conservative conditional combination mode will lead to the rapid increase of investment cost, resulting in a certain amount of investment waste. At present, there is no unified short circuit current calculation standard in the industry. Based on the actual power grid calculation example of a province in China, the short circuit current results of six condition combination modes is calculated and analyzed in this paper, expecting to provide an important reference for the setting of short circuit current calculation conditions.
Study on Gas Recovery Program Optimization in Deep Water Gas Reservoir
Authors: Li Zhong , Zhi Ji-qiang , Meng Wen-bo , Zhang Chong , Dong Zhao
Published: July 2020

LS-17 gas field is China’s first self-operated deep-water gas field in the south China sea. Located in the southeast of hainan island, the gas field has a depth of 1220-1560 meters. According to the gas reservoir characteristics of ls-17 gas field, the gas reservoir model and numerical model of water control process of ls-17 gas field are established, the productivity of existing wellhead gas reservoir is predicted, the gas production plan of gas reservoir is optimized, and the optimal solution of recovery rate of compressed gas reservoir is given under different system changes, different processes and different development modes. In this paper, the gas production rate and recovery rate at different gas production rates are predicted, and the gas recovery rate is optimized. The development method of intermittent gas production is put forward, and the parameters of intermittent gas production are not optimized. The deep water gas reservoir is characterized by high energy and serious water intrusion. This paper compares and evaluates the recovery efficiency under different water control technologies, and proposes a method for selecting water control technology measures in the process of gas reservoir development. The research ideas and methods in this paper effectively support the scientific decision-making of gas recovery program in LS-17 gas field and have certain guiding significance for the development of deepwater gas reservoirs in the south China sea.
Research on the Mixed Multi-attribute Group Evaluation System of Integral Energy System of Industrial Park Based on SNA Analysis Method
Authors: Nie Jing , Xu Ning , Ling Yunpeng , Xu Nan
Published: July 2020

At present, the system modeling of integrated energy system is a hot issue in the field of energy research. Most of the research focuses on the modeling of a specific regional energy system, but the research on the decision-making and evaluation system of integrated energy system is still in its infancy. Therefore, it is necessary to build a decision-making evaluation system for the whole process of the integrated energy system and design scientific evaluation indexes, methods and standards to evaluate the investment, construction, operation and benefits of the integrated energy system systematically and scientifically. On the basis of combing the existing research, this paper deeply analyzed the influencing factors of the whole process of regional integrated energy system, and excavated the factor association network through the social network analysis (SNA). After that this paper constructed the influencing factor association network of the whole process of the integrated energy system with the relationship between the factors as the network nodes. In order to provide reference for relevant research and project implementation, this paper identified the key indexes and built a hybrid index system of integrated energy system.
Decomposition Analysis of Influencing Factors of Electricity Consumption Demand and Intensity under Shanghai’s Transition Development
Authors: Fan Ying , Wang Chen , Sun Kege
Published: July 2020

With the transition development of economic structure and energy consumption structure, electricity consumption of the production sector in China has been growing rapidly since the 21st century. The degree of electrification in Shanghai has deepened and electricity plays an increasingly important role in the agriculture, manufacturing and service sectors. This paper analyses the influential factors of Shanghai electricity consumption demand and intensity in the production sector during 1998 and 2017 through Index Decomposition Method. The results show that the energy structure effect has a growing contribution to the electricity consumption demand growth for the production sector in Shanghai since 2008, which implies that the electrification trend in Shanghai has deepened. The impact of energy efficiency improvement in Shanghai overtakes the impact of economic scale effect and energy structure effect, thus leading to electricity intensity decrease in the production sector. Besides, energy efficiency improvement in the manufacturing sector contributes most to power saving in Shanghai. Economic structure transition also contributes to electricity intensity decrease in Shanghai due to the decrease in the scale of the manufacturing sector. So, it is necessary to further tap the space for energy efficiency improvement in manufacturing and service industries and promote electrification when making strategic decisions of transition development, thus leading to green transformation and development of economy and energy.
The Numerical Simulation and Experimental Research on Combustion Process in 660MW Boiler
Authors: Yu Lei , Tian Hui , Chang Zhen
Published: July 2020

In order to solve the problems of thermal insulation and ash prevention of the furnace combustion layer temperature detection devices installed on the boiler furnace, FLUENT software is used to numerically simulate the actual combustion process in the furnace of 660 MW power plant boiler, and the combustion status of each layer in the furnace is analyzed and studied. And then, according to the results of data simulation the thermal insulation and ash prevention technology implementation of the furnace combustion temperature detection devices is guided. The installation operation test results show that the furnace combustion temperature detection devices work within the range of instrument allowed −20°C∼85°C temperature, which can obtain the direct, rapid, real-time furnace combustion temperature data that provides a valuable source of data for further optimization control of boiler combustion process.
Analysis of underground pressure in fully mechanized top coal caving mining face in greater inclined and weak coal seam.
Authors: Liu liming , Xue Yafeng , Pan Yuntian
Published: July 2020

Taking Zhaogezhuang Coal Mine’s fully mechanized top coal caving test face as the engineering background, through real-time monitoring of the working resistance of the support and the displacement of the top coal and the old roof, the top coal and roof movements at the high dip angle were studied and analysed. The law and the falling characteristics, the initial pressure and the periodic step and pressure strength of the working face are analysed, and the changes and distribution characteristics of the working face pressure along the slope are analysed. Through the research results of this paper, it provides scientific basis for the reasonable parameter design and formulation of the large-inclined working face of the mine, subsequent production process and equipment improvement, and provides technical reference for the mining of similar working faces.
Analysis on Long-Term Mechanism for Energy Conservation and New Mechanism of China
Authors: Liu Ren , Chen Haihong , Xia Yujuan , Wang Zhonghang
Published: July 2020

The government must handle the relation between energy conservation and development in promoting the energy conservation. China is a developing country with a large population, and development has been a prior strategic mission for China for a long time. The energy conservation is an important tool to promote the development, gain better development and serve the development. In promoting the energy conservation, the government shall provide stronger support for the advancement of energy-saving technologies in R&D, engineering demonstration and application, promote innovation for energy conservation technologies and application of energy conservation technologies in industries, develop hi-tech industries and energy-saving industries to help enterprises improve their energy-saving technology level, build a energy-saving industrial system, greatly increasing the competitiveness of national economy and using energy conservation to promote the economic development and scientific development.
Research on the Evaluation Method of Technical Standard Implementation Benefits in State Grid Corporation
Authors: Wu Jinghua , Fan Jiangdong , Li Yan , Lv Chao , Zhang Pengyue , Xu Yan
Published: July 2020

By studying the traditional evaluation methods of the implementation benefits of the technical standards, this paper analyzes the advantages and disadvantages of different traditional evaluation methods. According to the analysis results and the operation of State Grid’s technical standards, evaluation methods of the implementation of the technical standards in line with the national grid were put forward. This provides the basis for the systematic implementation benefits evaluation of the technical standards of the national grid company.
Identifying coal structure using logging data
Authors: Liu Zhidi , Tang Xiaoyan , Yang Junru , Shi Mengxuan
Published: July 2020

Coal structure, which is important for the mining of CBM, is closely related to the coal reservoir fracture characteristics. This paper calculates the integrity coefficient, stability coefficient and fracture coefficient of coal, and constructs a chart confirming the division standard of the coal structure in the study area. The research results show that coal mechanical parameters can effectively represent coal structure. The integrity and stability coefficients of undeformed coal are the highest, and its fracture coefficient is the lowest; the integrity and stability coefficients of fragmented coal, granulated coal and mylonitized coal gradually decrease, and their fracture coefficients gradually increase. The methods described in the paper can classify coal structure relatively accurately and provide an effective new method for the delimiting of coal structure.
Practical Research on Fully Mechanized Caving Face in Extra Thick Coal Seam Based on Cutting Roof Pressure Relief Pre-fracturing Technology
Authors: Sun Zhenping , Liu Chungang , Gao Yuanyuan
Published: July 2020

In order to improve the top coal resources at both ends of fully mechanized top coal caving face in Extra-thick seam and the recovery rate of coal resources during the initial caving, reduce the impact of initial weighting on the working face during the initial caving, and reduce the rock pressure appearances during the mining period near the working face, the fracture damage theory is used to analyze the change of the breaking and caving step distance of roof rock girder and the initial pressure strength of fully mechanized top coal caving face after the roof cutting and unloading. It is concluded that the support pressure area of fully mechanized caving face moves forward, which enhances the caving ability of coal seam and the recovery rate of coal resources during the initial caving period. Taking a fully mechanized caving face of a coal mine in Shanxi Province as the research background, this paper compares and analyses the difference between the first weighting step and the first caving step of fully mechanized caving face with or without roof-cutting pre-fracturing before initial mining and at the end of two roadways. The results show that the first weighting step of fully mechanized caving face is shorter than that of non-pre-fracturing after the implementation of roof-cutting pre-fracturing technology. 1.1m, the first caving step is 16 m ahead of the time when the pre-cracking occurs; and by using borehole peeping technology, it is concluded that the top coal suspended in the triangle area of goaf breaks down along the fissures leading by pre-cracking blasting, effectively solving the problem of overhanging roof in the goaf of two roadways, bringing about direct economic and social benefits of 27.5 million yuan, which has broad prospects for popularization.
Effect of thickness ratio of overlaying layer to hydrate bearing stratum upon the settlement of seabed sediments during Natural Gas Hydrate Dissociation
Authors: Li Hongbo , Ma Shuzhi
Published: July 2020

The dissociation of natural gas hydrate in the process of exploitation will weaken the mechanical properties of the surrounding soil, which will lead to the deformation and destruction of the seabed sediment, thus posing a potential threat to the safety of the undersea engineering infrastructures. In this paper, the finite difference method is used to simulate the vertical deformation of seabed sediments, and examine the effect of thickness ratio of the overlying layer to the HBS upon soil settlement via an established three-dimensional model of submarine hydrate mining. The main research results are as follows: The maximum settlement occurred at the top surface of HBS dissociation centre and the settlement decreased significantly from the mining well to the surrounding and from HBS to the overlying layer. The range of settlement trough on the top of HBS is far less than the overlaying layers. The thickness ratio of the overlying layer to the HBS will have a great influence on the distribution of sedimentation and deformation of seafloor sediments caused by hydrate dissociation. The deformation and the range of the settlement trough both decrease with the increasing thickness ratio of overlying layer to HBS. The research results will provide a strong theoretical reference for the stability of seabed and mining platform during hydrate mining.
Test and Experimental Study on Vibration and Noise Characteristics of Distribution Transformer
Authors: Ma Yuchao , Mo Juan , Wang Guangzhou , Li Xiang , Lu Ling , Ma Shuhui
Published: July 2020

With the continuous scale expansion of power grid, more and more distribution transformers go deep into the urban residential center, which results in increasingly prominent vibration and noise problems. Mastery of the vibration and noise characteristics of the distribution transformer and its propagation law is an important test basis for proposing vibration and noise reduction measures. Relying on a typical 10 kV distribution transformer, vibration and noise tests were carried out on the interior and exterior of transformer tank respectively in this paper. Advanced fiber-optic hydrophone test system was adopted in the test to solve the problem of accurately measuring the internal sound pressure of the transformer in a high electromagnetic field. Finally, time-domain analysis and frequency-domain analysis were done on test data to acquire the acoustic-vibration characteristic and propagation law of the 10 kV distribution transformer. The vibration spectrum of a transformer body is mainly 100 Hz and its rate, the vibration characteristics of distribution transformer tank is basically consistent with the internal transformer core, and the propagation of transformer vibration and noise in oil shows obvious laws.
Human Facial Feature Matching based on Motion-Smoothness Constraint
Authors: Dong Liguo , Xu Wenchao , Zeng Xianxian
Published: July 2020

Face recognition is a practical and important problem. In our life, face recognition problems exist everywhere. How to identify the face in the image accurately and quickly is an important and urgent topic. In this paper, an efficient and accurate face recognition method based on keypoints feature matching is proposed to extract the keypoints features of the face image, and then the nearest neighbor method is used to obtain a large number of keypoints rough matching. Then the correct matching of the keypoints is determined by the motion smoothness constraint of the original keypoints matching. Finally, the matching of the face is determined according to the number of keypoints matching between the two input face images. Some experiments show that this method is suitable for face recognition with expression change and pose change.
Failure Analysis of 2Cr13 Blade in a 135MW Low Pressure Steam Turbine
Authors: Zhao Hai , Jiang Chong , Gao Zhiwei , Hu Bing , Tian Chengchuan
Published: July 2020

The failure mode and causes of low-pressure rotor 2Cr13 stainless steel blades in a power plant steam turbine were analyzed using fracture analysis, SEM, chemical composition analysis and metallographic techniques. The fracture characteristics and mechanism of the blades were discussed. The results show that the failure mode is fatigue which was caused by the machining tool mark at R corner of blade root and tenon transition area.
A Method for Local Clock’s Error With Kalman Filter Based on Mahalanobis Distance
Authors: Chi Xinghua , Zhu Zhaohan , Dong Zhouyang , Xu Fenghui , Xu Jian
Published: July 2020

In order to improve the punctuality of local clock, it needs to use a proper filter to weaken the influence caused by noise in raw clock’s error data. In this paper, An improved Kalman Filter based on Mahalanobis distance is proposed, and the process are shown in details. The final test shows the effectiveness of the improved method in estimation of local clock’s error with gross error.
Research on Bearing Capacity of High Pile Cap with Coupling Beam Based on Finite Element Method
Authors: Hao Xin , Wang Wen , Cao Yue , Tian Guoping , Qin Wei
Published: July 2020

In the construction project, the foundation of multiple pile caps and connecting beams is used to solve the problem of insufficient horizontal bearing capacity and excessive displacement. However, there is no very clear theory to analyze the calculation theory, bearing capacity calculation, and displacement calculation of connecting beams. Therefore, in the paper, the finite element method is used to model and analyze the influence of horizontal bearing capacity, the top of the pile foundation and the connection beam on the internal force. Meanwhile, the influence of horizontal displacement, the selection of the connecting beam size and the position of the connecting beam on the bearing capacity is analyzed as well. Besides, a concise calculation method and an assessment on the bearing capacity of the actual engineering foundation are gained. The experiment proves that the research method in the paper can well simulate the vertical compression static load test of high piles with connecting beam caps.
Analysis on the Mechanical Stability of the Leg Joints in UHV Transmission Tower
Authors: Qin Wei , Wang Quan , Zhang Zhuoqun , Hao Xin
Published: July 2020

Transmission line pole tower, whose safety and reliability will directly affect the safe and stable operation of the entire transmission line, is a rod-shaped and tower-shaped structure that supports overhead transmission line conductors and ground lines and maintains a certain distance between them and the ground. Moreover, the stress stability of the leg structure joints in UHV transmission towers is mainly analyzed in the paper. With the help of the finite element analysis software, taking the arrangement of the long and short legs in the actual structure of the tower as an example, the influence of different angles of the tower on the bending moment is compared and analyzed under the condition that the main material slenderness ratio is the same. Meanwhile, in order to eliminate the influence of horizontal force on the height of different tower legs, only the bending moment generated by the structural system at the tower legs under axial pressure is considered to continuously improve the stability and reliability of the line pole tower structure, so that the power safety can be guaranteed to a large extent.
Numerical Simulation of Shock Wave-Boundary Layer Interaction with Supersonic Film Cooling
Authors: Liu Zhigang
Published: July 2020

As an effective external cooling method, film cooling can significantly reduce the wall temperature of hot end components of aero engines and large liquid rocket engines. With the development of supersonic turbine blade, liquid rocket engine thrust chamber and ramjet thermal protection technology, the impact of shock wave-boundary layer interaction on the cooling effectiveness of film cooling is a problem that must be considered in the engine heat transfer design. In this paper, the two-dimensional supersonic film cooling is simulated based on the plane slot model, and the blowing ratio is similar to the actual engine. Impact of wave structures on film cooling was studied, and flow loss was evaluated by total pressure and entropy parameter to investigate the film cooling efficiency and uniformity distribution. Physical mechanism of shock wave-boundary layer interaction and its impact on film form was revealed. It shows that the shock wave leads to dramatic changes in flow parameters. Boundary layer separation is found due to the shock, and significantly affects the cooling efficiency. The blowing ratio is an important factor affecting the cooling efficiency. With blowing ratio increasing, local film cooling effectiveness and average cooling efficiency are improved and cooling uniformity decreases. However, the shock wave will cause the temperature of the insulation wall to rise, resulting in decreased cooling efficiency.
Finite Element Analysis and Test Verification of Super-Large Vertical Steel Storage Tank
Authors: Ji Jing , Song Huayu , Xu Ming , Li Zhihui , Wang Xue , Jiang Liangqin
Published: July 2020

In order to master the static characteristics of the super vertical steel storage tank structure, based on the potential flow theory, the fluid structure coupling element and contact element are introduced, and the three-dimensional finite element model of 150000m3 super large steel storage tank system is established by using the finite element software ADINA. The static analysis of the tank structure under different water filling height is carried out, and the circumferential and axial stress and distribution at different height of the tank wall structure are obtained. The results are in good agreement with the experimental results, and the rationality of ADINA finite element modelling method is verified. Finally, the stress nephogram and design suggestions of the wall of the super vertical steel tank are given, which lays the foundation for the further static and dynamic nonlinear analysis of the tank.
A New Repair Criterion for Inconel690 Alloy Steam Generator Tube with Fretting Wear
Authors: Tao Yuchun , Peng Zhizhen , Kong Chenguang , Huang Song , Hui Hu
Published: July 2020

Structural integrity assessment of steam generator tubes(SGT) is important for the safety operation of pressurized water reactor. In this work, a repair criterion for Inconel690 SGT with fretting flaw was proposed. Firstly, experiments were conducted to address material strength, eddy current examination and bursting pressure of defected SGT. Then, a numerical method was proposed to predict bursting pressure. At last, all factors were concluded in a simplified statistical method of structural integrity assessment. For anti-vibration bar fretting, Condition Monitoring criterion, Operational Assessment criterion as well as the repair criterion for different inspection interval were proposed. The present criterion can provide reference for the inspection interval considering long-term temporary shutdown or standby.
Analysis of Financial Indicators of Listed Companies——A Case Study of Aonong Group
Authors: Zeng Zhiqian , Li Xinglin , Chen Xudong
Published: July 2020

With the rapid development of China’s economy, animal husbandry has become an indispensable industry in China’s economic development. Both the number of poultry raised and the output of products have increased significantly compared to before. China’s animal husbandry is gradually moving towards regionalization, industrialization, and scale. This requires the state’s support for animal husbandry in terms of policy, financial guarantee, and personnel training. At present, China’s livestock industry accounts for about 30% of the primary industry, and it has become an important pillar of the primary industry. Because of this, it is particularly important to analyze the financial statements of agricultural groups engaged in animal husbandry. This article takes the financial statements of Aonong Group listed on the Shanghai Stock Exchange from 2014 to 2018 as an example for financial analysis.
Contactless Distribution mode based on Circular Express Box
Authors: Liu Na
Published: July 2020

During the outbreak of new coronavirus, the traditional way of distribution has many disadvantages, such as wide contact with people and wide range of activities. These disadvantages will not only cause cross infection between distribution personnel and customers, but also increase the difficulty of epidemic prevention and control to a certain extent. As a new distribution mode, contactless distribution is widely used under special outbreaks due to the advantages of fewer contact personnel and high distribution efficiency. In view of this situation, we have carried out a study on the problems arising from the express delivery process, put forward the “Contactless distribution mode based on circular express box” point of view, namely, the establishment of express delivery station shipping station in the community. All express delivery companies are placed in the designated location, in order to solve the shortcomings of the traditional delivery process.
Classification of short-term loads of enterprises using LightGBM
Authors: Hao Meiwei , Tian Yuting , Gao Jing , Wang Yin , Tian Runze
Published: July 2020

As the society becomes increasingly energy-conscious these days, enterprises not only make a point of continuous supply for power, but try to improve power utilization efficiency and design scientific power use plans. In this study, the LightGBM algorithm was used to classify the short-term loads of enterprises, and the characteristics of short-term loads were analyzed to realize accurate classification. The research results will be instrumental to the enterprises’ scientific scheduling of power use, thereby improving safety and reliability of the power grid, and providing a strong basis for future grid planning.
Evaluation of Safety Management Factors of Subway Construction Site Based On Risk Preference Information
Authors: Miao Haoyue
Published: July 2020

In order to guarantee the construction quality and personnel safety during the subway construction process, the index system of subway construction safety management factors was established on the basis of questionnaire survey and factor analysis, including a total of 20 items. Introduce a pessimistic coefficient to optimize the hierarchical analysis model of interval numbers, construct a reciprocal judgment matrix of interval numbers that meet the requirements of consistency approximation, give weight to various safety management indicators during subway construction, improve the scientificity of weight setting, and make The key points and difficulties of construction safety management work provide a basis for ensuring the safety of subway construction.
Research on Structural Seismic and Vibration Control Technology of Modern Buildings
Authors: Zhou Lijun , Zhao Qinghong
Published: July 2020

In recent years, the overall development of China’s construction industry has been relatively good, but due to the continuous improvement of people’s daily life quality, the requirements for building structures have become higher and higher. This paper analyzes the structural earthquake resistance of modern buildings and the application of corresponding vibration control technology, and analyzes the specific application of vibration isolation and control technology to provide effective guarantee for the stability of modern building structures.
Design of Drug Recovery Scheme Based on Path Optimization
Authors: Wang Zhaojiu , Liu Xiaohan , Wang Sixian , Meng Xiangyu , Liu Chongshuang , Tang Changyu
Published: July 2020

Countries with the upsurge of garbage sorting, all over the Word attach importance to the recycling of expired medical products. The design of reverse logistics network of expired drugs has become a key problem in the field of pharmaceutical safety. Considering that expired drugs can not be recovered effectively, this paper studies the problem of drug recovery logistics by using TSP model and mileage saving model. It is beneficial to arouse the enthusiasm of enterprises and residents to participate in the recovery of expired drugs, thus reducing the production and manufacturing costs of pharmaceutical enterprises in China and reducing the pollution of waste drugs to the environment.
Traffic accident prediction based on Markov chain cloud model
Authors: Ma Xiaobin , Zhang Jinyang , Huang Peijie , Sang Huiyun , Sun Guanglin , Chen Jing
Published: July 2020

A dynamic prediction model based on Markov chain and cloud model is established to predict the volume of road traffic accidents which is under the guidance of stochastic process and cloud theory referring to the characters of the road traffic accidents and time series data. First of all, we establish the evaluation model based on cloud model, and get the relative error range of the observed value and the predicted value. Then we can use Markov chain to correct the relative error. The result shows that this method balances both randomicity and fuzziness and has higher accuracy. Therefore, it can be used for analysing the trend of road traffic accidents in different traffic conditions and provide evidence for safety early warning and corresponding accident prevention countermeasures formulation in relative road segments.
Analysis on the damage causes of sabo dam with one open cross section at upstream of Fuxing bridge in Lacus Creek
Authors: Chen Shu-Tzu , Hsu Chun-Li
Published: July 2020

Lacus Creek is one of the important tributaries of the Laonong River upstream of the Gaoping River, which is an important river in southern Taiwan. After Typhoon Morakot in 2009, severe sediment disasters occurred, which affected the security of local revitalization, and the government has since invested in numerous projects to reduce the impact of sediment and flood disasters. In 2017, the Kaohsiung City government built a sabo type dam upstream of Fuxing Bridge in Lacus Creek; however, it was severely damaged by a heavy rain less than a year later. To investigate the cause of the damage, site investigations, concrete sampling tests, hydrology analysis, and reviews of the planning and design methods, construction process, etc. have been conducted, in order to understand the cause of the problem, avoid repeating mistakes, and clarify the responsibility of the administrative agency. The investigation and research found that many recent cases of torrent management have considered the transverse structures as isolated wildlife corridors, reduce the height of the transverse structures, create gentle slopes of the downstream surfaces, add fish passages, cut (openings) export slits, etc.; however, after setting up these environmentally friendly facilities, their effect and impact have not been explored in depth. This research survey found that, although the frequency of heavy rain events is not high in recent years, the current iterative impact of continuous rainfall may exceed the original design requirements. If the overflow mode with a single export opening is added, the scouring energy will be concentrated, and this additive effect is likely to cause the foundation of the sabo dam to lose bare space, and finally, the dam will be damaged. Therefore, it is recommended that when designing these torrent transverse structures, try to avoid using the method of a single narrow opening: it is better to increase the number of export openings (like a slit dam), expand the size of a single export opening, or adopt a fully enclosed dam design.
Study based on contactless distribution patterns under the outbreak
Authors: Luo Cuiping , Wu Lei , Liu Na
Published: July 2020

As a new way of distribution, contactless distribution is widely used in special epidemic because of its advantages of less contact personnel and high efficiency of distribution. Based on the analysis of traditional face-to-face distribution, this paper points out the necessity of developing non-contact distribution during the epidemic. For contactless distribution, the article analyses the common contactless distribution methods and their respective advantages and disadvantages. In order to meet the distribution requirements under the epidemic, the way of contactless distribution has been further optimized in terms of technology. The aim is to reduce external exposure during epidemics and risk of disease.
The Research and Analysis on Users’ Evaluation System of Fresh Community Joint Distribution Service
Authors: Zhang Heng , Xu Chengzhen , Gong Yanan , Ai Xiufeng , Wang Xiaolu , Sang Huiyun
Published: July 2020

Compared with the traditional mode, community joint distribution has the advantages of integrating logistics resources and reducing operating costs. In this paper, the primary evaluation index set is obtained through questionnaire survey method and relevant literature analysis method. The AHP model of group decision making and the interval estimation method are applied to eliminate the weak weight index and reserve and rank the strong weight index on the index set. Further, a more effective community fresh food common distribution service evaluation system was established to provide a scientific theoretical basis and valuable reference for the future development of community fresh food common distribution.
Construction of safety training course system under crisis theory
Authors: Liu Jikun , Guo Hongjuan , Wang Cuixia
Published: July 2020

Based on the statistical analysis of coal mine accidents in 2018, it is found that there are some problems in coal mine, such as the poor effect of safety training, the poor initiative of employees in learning, and the loopholes in assessment, which are the main reasons for the illegal operation of employees. In view of the above problems, by introducing the concept of crisis education, a set of crisis education curriculum system is developed for the safety training of on-site operators in coal mining enterprises. Taking wechat mini program as the carrier, a comprehensive safety training function module is designed, and three ports of teachers, trainees and managers are configured at the same time to meet the needs of different users. And through JS, hbuilder and other technologies to achieve the development of wechat mini program. This course system has certain guiding significance to optimize the training course, improve the training effect, enhance the learning enthusiasm of employees, and reduce the three violations.
Research on Performance and Decision-making Method of Project Management Mode
Authors: Liu Longhua
Published: July 2020

Aiming at the research of project management mode performance and decision-making method, this paper adopts the method of expert group decision-making. Group decision-making is to give full play to the wisdom of the collective. First, experts are selected and distributed to each functional department of project management, and the experts participating in the evaluation are all participants in the evaluation decision-making process. Then, according to the weight coefficient of experts and the data of experts’ evaluation, the evaluation results are calculated and determined according to the data comprehensive method. The weight coefficient of experts can be customized according to the influence of each expert, or each expert can be calculated according to the same weight. There are two kinds of data synthesis methods: expert evaluation result weight synthesis and expert evaluation matrix synthesis. This paper mainly designs the performance evaluation index system of project management, and constructs the performance evaluation mode based on the perspective of project integrated management, which provides a reference for the performance and decision-making method of project management mode.
Application and Deformation Control of Pile-anchor Support for Deep Foundation Pit in Soft Soil Area
Authors: Lu Wei , Zhao Ling Yun , Wang Kai
Published: July 2020

Based on the engineering practice of deep foundation pit project in a coastal area, design plan and conceptual method for control the deformation of pile-anchor support system for foundation pit were introduced. The methods for insurance of the stability and decreasing the influence to the surrounding structures during excavation of the foundation pit were as below: increasing the excavation area with considering the position of seepage cutoff wall and construction road to reduce the earth pressure; evaluating the deformation of the stratum and support structure during excavation of pit by 3-D numerical simulation; using site test to provide guideline for construction of the jet grouting anchor; employing dynamic monitoring to provide the early warning. The application of the design can provide reference for similar projects.
Deformation of Large Steel Tank under Uneven Foundation Settlement
Authors: Chen Yanfei , Ma Shang , Dong Shaohua , Liu Hao , Sun Bingcai , Lou Fanyu , Xia Tongjing , Hu Dong , Li LuLu
Published: July 2020

In this paper, the deformation behaviour of the large steel tank under uneven foundation settlement is investigated. The finite element model of the tank is firstly established, the finite element analysis of the large steel tank under the harmonic settlement conditions is carried out consequently, the influence of height-diameter ratio, diameter-thickness ratio and wind girder stiffness on the deformation behaviour of the tank top is studied. Based on the finite element results, regression equation for predicting maximum radial displacement of the tank is proposed. Furthermore, the accuracy of proposed solution is validated.
Digitalization as a driver of development of domestic animal breeding
Authors: Marinchenko T E
Published: July 2020

The aim of the study is to analyze the level of digitalization of livestock production, determine the prospects of the process against the background of their existing strategic documents and the level of domestic developments. The study was based on the program documents, scientific publications, and data on Russian developments. The study used the monographic methods, comparative and system analysis methods, idealization and mental modeling methods, as well as a logical approach. Since the government has posed a challenge to ensure the entry of the Russian Federation in the five largest economies in the world, the transformation the agriculture through the introduction of digital technologies and platform solutions, the issue of digitalization of agriculture and livestock as less advanced in matters of digitalization is very relevant.
System of automatic video stream images evaluation and preprocessing for ADAS
Authors: Egorchev A A
Published: July 2020

In this article, the algorithm of preliminary filtering of images of a video stream based on assessment and the subsequent correction of such qualitative characteristics of images as contrast, noise level, sharpness and existence of illumination is considered.
Designing the algorithm of profiler’s decision-making
Authors: Troshkov A M , Bogdanova S V , Ermakova A N , Dronov S N , Shuvaev AV
Published: July 2020

In this paper, a package of information profile characteristics is proposed and formed based on the specified requirements, which are decomposed into three packages (kinect, thermal imaging, and visualization). They are processed on different hardware and software platforms. Designing a profiling algorithm only allows you to make a guess about possible involvement in an act of unlawful interference or an attempt to perform an unauthorized action. The actual threat can be identified only on the basis of an in-depth personal search of the alleged offender and the items transported and transported by them. Specialists in the use of face identification methods are called profilers, but there are not enough special information applications to improve the efficiency of such specialists’ work. Detection of suspicious fragments in human anthropometry in appearance and behavior occurs during psychological testing by a Profiler, which is understood here as a visual diagnosis of the internal state of a person through visible manifestations of characteristic signs that may indicate an upcoming illegal act, so the use of information technologies will allow more accurate and memorizing, as well as comparison increases the probability of a correct Profiler decision. An algorithm for generating decision-making Profiler theoretically increase the analytical work of specialists, and study of this issue was included in the study qualification of the employees of the linear police Department on transport, in particular at the airport and Stavropol train station as there is a conclusion of the chief of the police Department.