bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of horizontal well multi-cluster network fracturing in tight reservoir
Authors: Yunpeng Jia , Rui Liu , Ye Xiufeng , Yu Bin , Tian Fuchun , Zhao Yudong
Published: May 2020

GD14H, a horizontal well drilled in tight reservoir of Dagang Oilfield, reveals complex lithology, large burial depth, and poor physical properties. In order to improve its fracturing performance, a new technique of multi-cluster network fracturing was adopted based on a series of optimized multi-cluster perforation parameters and fracturing treatment parameters, and the 15-cluster fracturing was determined. Field test has demonstrated outstanding stimulation results. Moreover, the horizontal well fractures monitoring via the stable electric field/potential method shows that the measured results match well with the results of physical model for GD14H. The successful application of this technique in Dagang Oilfield implies a great breakthrough in the fracturing of tight oil horizontal wells in Dagang Oilfield, and lays a valuable foundation for stimulation of other similar tight oil and gas reservoirs.
Numerical Analysis of Horizontal Bearing Capacity of Composite Pile Foundation for Offshore Wind Turbine
Authors: Ting Guo Wen , Chong Wu Yan
Published: May 2020

In recent years, with the rapid development of offshore wind power, the installed capacity is increasing, and the traditional single pile foundation is under heavy load. Therefore, the composite pile foundation composed of single pile foundation and bucket foundation (friction wheel) installed outside the pile body is gradually adopted to ensure the safety and stability of the fan during its service. In order to study the bearing capacity of composite pile foundation, the ABAQUS finite element software is used to study the horizontal bearing capacity of composite pile foundation, analyze its bearing capacity advantages compared with the traditional single pile foundation, and further optimize the design. The results show that: under the same load, the displacement and bending moment of composite pile foundation are greatly reduced due to the existence of friction wheel, and the horizontal bearing capacity of composite pile foundation is significantly better than that of single pile foundation; the diameter and height of friction wheel in composite pile foundation have obvious influence on its horizontal bearing capacity, but its thickness has limited influence on the horizontal bearing capacity of composite pile foundation. It can be seen that the bearing capacity of composite pile foundation is significantly better than that of single pile.
Problems and suggestions on environmental protection of International Power Plant Investment
Authors: Zhang Qiuxia , Deng Jiming , Hu Wendi
Published: May 2020

With The Belt and Road Initiative strategy, international power investment has become a major business area, and environmental protection has become one of the important restricting risks. Based on the systematic analysis of the severe challenges faced by the current international power investment, this study provides five major suggestions to deal with the environmental protection problems including: (1) strictly abiding by laws and regulations, (2) strictly implementing the environmental protection agreements, (3)improving the environmental management system, (4) focusing on the whole life cycle management and control, (5) doing a good job in territorial integration. It means to provide a reference for the green development of the international power project investment.
Study on the Adaptability of ‘Huangguogan’ in Jiangyou, Sichuan Province
Authors: Wang Tie , Xiong Bo , Jin Zhenghua , Zhang Haiyan , Chen Xinlian , Fang Qi , Zhou Qianfei , Tian Zheng , Chen Mingrong , Wang Jun , Sun Guochao , Wang Zhihui
Published: May 2020

In this experiment, ‘Huangguogan’ introduced from Shimian to Jiangyou was used as the materialand Shimian ‘Huangguogan’ as the reference. The adaptability of ‘Huangguogan’ was studied from three aspects: site climate conditions, basic indicators of tree bodyand fruit quality. The results showed that the overall situation of Shimian ‘Huangguogan’ was better than Jiangyou ‘Huangguogan’, especially the internal quality of the fruit, which indicated that Jiangyou was not suitable to introduce ‘Huangguogan’.
Study on the Influencing Factors of Agricultural Development in Qinghai Province
Authors: Liu Jiaxing , Chen Rongnan , Han Rui , Chen Laisheng
Published: May 2020

The level of agricultural economic development in Qinghai Province is directly related to the economic development, social stability, and national unity of Qinghai Province. It has an extremely important position, so studying the influencing factors of agricultural development can improve the level of agricultural development in Qinghai Province. This paper extracts seven indicators from four dimensions: production equipment, capital input, labour, and main input for multiple linear regression analysis. This paper analyzes that the total power of agricultural machinery, the proportion of peasant population at the end of the year, and the number of large livestock stocks at the end of the year have a negative correlation with agricultural development in Qinghai. The total investment in fixed assets in agriculture, rural employees, total planted area of crops, and the area of closed mountain (sand) forest at the end of the year presented positive correlations to the agricultural development of Qinghai Province. And the conclusion shows that the influencing factors of agricultural development in Qinghai Province are not only these seven main factors, but also other small aspects that need to be considered.
Effects of Different Leaf Area Index on Fruit Quality andproduction ofHuangguogan
Authors: Qiu Xia , Zhang Huiyi , Wang Bozhi , Duan Changwen , Zhang Haonan , Li Huizhi , Wang Huaer , Xiong Bo , Wang Zhihui
Published: May 2020

In this experiment, Citrus Huangguogan was used as the test material, and5 leaf area index (LAI) treatments were set. The fruit quality and production of each treatment were measured and analysed. With the decrease of LAI, single fruit weight, horizontal diameter, vertical diameter, total soluble solids, content of total sugar and sugar-acid ratio increased. Meanwhile, fruit shape index and content of Vc didn’t differ significantly, and content of TA decreased significantly. The yield per mu increased first and then descend, simultaneously, the number of fruits per plant, and the yield per plant increased. T1 (2.0) was the appropriate LAI of Huangguogan, under which the yield was higher and the fruit quality was the best.
Design of horticultural wireless intelligent maintenance system based on STM32 and Android
Authors: Ren Ling , Zhai Xujun , Yang Yafei , Xu Jiandong
Published: May 2020

According to the need of indoor potted plant maintenance, the control system is designed with STM32 single chip microcomputer and Android technology. To solve the problem of wiring difficulty in traditional wired control system, wireless monitoring is realized by using Internet of things and wireless sensor technology. The system detects soil moisture, pH value, environmental temperaturehumidity and illuminance of potted plants by sensor module, and the detection value is displayed after being processed by STM32 single chip microcomputer. Set the range of humidity value, temperature value, pH value and the minimum threshold of light intensity by pressing the key, and compare the set value with the monitored parameter value. If the humidity value is not within the set value range, the SCM outputs the control signal to start or close the solenoid valve for watering; if the temperature value is not within the range, the heater can be started for heating or the fan ventilation can be started for cooling; if the pH value is not within the range, an alarm will be given automatically to remind the user to fertilize and allocate the soil;when the photosensitive sensor module detects that the light intensity is insufficient, it turns on the LED light to supplement the light. At the same time, Android application is developed to realize remote control of watering, lighting and ventilation through mobile terminals. The simulation results show that the system has a high degree of automation, which can realize the intelligent maintenance of horticulture. It is of great significance to further improve the development of planting and maintenance towards intelligent direction in China.
Research and Design of Intelligent Greenhouse Control System Based on AIoT Fusion Technology
Authors: Liu Haibin , Fang Shengyu , Guo Xinqin
Published: May 2020

This article designs the entire intelligent Greenhouse system architecture, collects a large amount of data such as temperature, humidity, light, and water through Multi-sensors, and implements an improved fuzzy neural network control algorithm. The advantage of this algorithm over traditional neural networks is that it can express fuzzy and qualitative the knowledge,which also improves the overall learning ability of the system. This intelligent system combines advanced technologies such as AIoT, NB-IoT, and 5G and uploads sensor data to the cloud platform. Through this improved learning algorithm, it provides optimized temperature, humidity and lighting conditions for plants in the greenhouse, and optimal growth conditions. In addition, this system design also optimizes NB-IoT power management, which can improve the overall system information transmission rate and decoding efficiency, and better achieve connection between the 5G and NB-IoT in order to link up each operations and for transmissions. That design and research of the intelligent greenhouse control system has improved the function and the value of the traditional greenhouse control system. Through the AIoT fusion technology, the entire intelligent greenhouse system is made more convenient, intelligent and integrated.
Application of Pharmaceutical Wastewater in Planting French Marigold
Authors: Wang Yu , Huang Zhidong
Published: May 2020

Based on biological method, the harmless treatment of pharmaceutical wastewater is achieved, which is applied to planting French marigold after suitable dilution. The protein content, vitamin c content and reducing sugar content of French marigold are determined with ultraviolet absorption method. The experiment results show that planting French marigold with pharmaceutical wastewater had no bad effect on French marigold, which facilitates reutilization of pharmaceutical wastewater.
Comprehensive treatment and ecological restoration of mine geological hazards for Yanchi mountain in Jinan City
Authors: Meng Fan-Qi
Published: May 2020

The mining of underground iron ore in Yanchi mountain causes many geological disasters, such as mountain collapse, ground fissures, collapse and unstable slope, which threatens the safety of people’s lives and property, and causes ecological environment problems such as soil erosion, topographic landscape destruction and vegetation damage. According to the causes and current situation of geological hazards and ecological environment in Yanchi mountain, comprehensive treatments such as filling goaf and ground fissures, cutting slope to eliminate danger, building retaining wall and drainage ditch, hanging net spraying and slope greening have been taken to eliminate hidden dangers of geological hazards and restore ecological environment. These measures have achieved remarkable governance results, which can provide reference for comprehensive control and ecological restoration of mine geological hazards in similar areas.
Research on Dynamic Display of Radar Detection Range in Complex Electromagnetic Environment Based on GIS
Authors: Zhang Qiongyu , Guo Shichao , Wu Nankai , Deng Jiaxin
Published: May 2020

In this paper, relevant researches are made on the system of electromagnetic environment situation and the range of radar in complex electromagnetic environment. The parameters of electromagnetic environment data calculation parameters are proposed, and the design of a 3D radar situation display algorithm is used to develop the comprehensive display system of electromagnetic environment information. A typical dynamic simulation of radar environment is given. It can display the electromagnetic environment situation more intuitively and comprehensively, and can provide analysis methods and demonstration evaluation for the increasingly complex battlefield electromagnetic environment display, laying a foundation for a certain range of battlefield electromagnetic 3D visualization environment statistical data output and situation visualization.
Recovering selenium from a selenium-bearing pyrite smelting dust by collectorless flotation
Authors: Qi Nie , Yong Cheng , Ping Lu , Hanping Zhang , Cong Liu
Published: May 2020

In order to recover the valuable selenium in a pyrite smalter which contain 2.18% selenium, 0.18% copper, 0.75% zinc and 45.87% iron, contains this paper many tests were conducted and finally determined flotation as a suitable method. Satisfying results were obtained under the following flotation conditions: grinding fineness was 95% of -0.037mm and the flowsheet including one stage roughing, one stage cleaning and two stage scavenging. In addition, sulfuric acid was used as pH modifier, sodium silicate and sodium hexametaphosphate were used as depressants. According the test results, the flotation concentrate contains 7.254% selenium with recovery 80.60%, only 0.409% selenium contain in tailings, meanwhile mercury and siliver are recovered as by-products, the bulk concentrate contain 987.35g/t mercury, 1025.10g/t siliver.
The application of reservoir prediction method based on seismic low frequency properties in Xishanyao Formation in SN58 well area
Authors: Tan Jianhua , Lu Jianguo , Zhang Yongbo , Liu Mingyang , Xiang Jialin , Yi Li
Published: May 2020

In order to eliminate the shielding effect of the coal seam on the sand body, better predict the sand body, comprehensively apply the seismic forward modeling method and frequency division technology to extract the low frequency signal in the suitable frequency range, the seismic information of the coal seam can be filtered out, and the sand body is retained. There is a school signal, and then according to the matching relationship between the low frequency signal and the sand body, the distribution range of the sand body can be well predicted, and then the seismic inversion method and the logging data of the new drilling are used to verify whether the sand body distribution is reasonable. The results show that the sand body interpretation conclusion of single well logging data has a good correspondence with the sand body distribution range predicted by reservoir prediction based on seismic low frequency properties. In the absence of well data to participate in the calculation, the reservoir prediction method based on the low-frequency properties of the earthquake can directly reflect the distribution range of the sand body, and the reliability of the predicted sand body boundary range is higher.
Risk Analysis of Geological Disasters in Southwest China
Authors: Zhang Chao , Qin Tingxin , Huang Dong , Wang Wan , Xu Fengjiao
Published: May 2020

In this study, four provinces (cities) in southwest China were taken as the study area, and eight risk evaluation indexes were selected to construct the evaluation index grading system, including elevation, slope, relative elevation, soil erosion, annual precipitation, NDVI, land use and population. The analytic hierarchy process was used to obtain the weight coefficients of each evaluation index, a geological hazard risk assessment model for the study area was established, and spatial calculation and visual expression were performed by ArcGIS. The results shows that the area of moderate-risk is the largest, accounting for 37.46% of the total area; followed by the low-risk area, which accounts for 23.89%; the proportions of high-risk areas and extremely high-risk areas are 23.59% and 15.07%.According to the risk analysis results, the geological disasters area with high risk include southwest Yunnan, central Sichuan, southwest Guizhou and northeast Chongqing.
Amazon Fire Monitoring and Analysis Based on Multi-source Remote Sensing Data
Authors: Yao J Q , Zhai H R , Tang X M , Gao X M , Yang X D
Published: May 2020

In August 2019, a large-scale fire broke out in the Amazon rainforest, bringing serious harm to the ecosystem and human beings. In order to accurately monitor the dynamic change of forest fire in Amazon rainforest and analyse the impact of fire spreading and extinction on the environment, firstly, based on NPP VIIRS data covering the Amazon fire area, the sliding window threshold method is adopted to extract the fire point, and the cause of fire change is monitored and analysed according to the time series. Secondly, based on the time series of CALIPSO data, the vertical distribution changes of atmospheric pollutants in the amazon fire area are analysed, and the comprehensive analysis is carried out by combining NPP VIIRS data. The experimental results show that only NPP VIIRS data is used to predict the fire, and the combination of CALIPSO data can better monitor the forest fire and predict the fire development trend. The combination of optical image and laser radar has greater advantages in dynamic fire monitoring and fire impact analysis. The method described in this paper can provide basic data reference for real-time and accurate prediction of forest fires and provide new ideas for dynamic fire monitoring.
Jinan City Land Use Monitoring Based on Landsat data from 2009 to 2014
Authors: Ju Xiaolei , Wang Songbo
Published: May 2020

In this paper, the land use changes of Jinan City based on Landsat 5 in 2009 and Landsat 8 images in 2014 were described. The images were reprocessed by radiometric calibration, geometric correction, image enhancement, and then the land use changes information were extracted by supervised classification, which was classified by six samples, including cultivated land, forest land, construction land, water system and unused land, then transfer matrix was showed. The results indicate that from 2009 to 2014, the area of construction land, the grass land and water system has been decreasing with the area of cultivated land, forest land and unused land increasing. The cultivated land has suffered the most, and construction land has increased the most.
Study on Safety Analysis of Large Angle Rolling Test Facility for Motion Conditions
Authors: Gong Zili , Yu Shengzhi , Wang Xiaoyan
Published: May 2020

The large angle rolling test device for motion conditions is an Electromechanical-hydraulic integrated test facility, which provides a simulation environment for nuclear safety related verification test and basic technical research in laboratory. The test device is complex in composition. The method of identifying hazards from physical hazards and human behavioral hazards is used to find out the risk factors. Therefore, the test device has guiding significance for the safety and reliability design of nuclear power plant system, as well as for the personal security of operators, the configuration of test site, and the formulation of safety plans.
Design of Power Security Protection System Based on Neural Network Algorithm
Authors: Huang Yusong , Zhang Honglue , Shi Shi , Lv Weilun
Published: May 2020

Power safety is closely related to production and life, so an essential part of the power safety protection system. Safety accidents are inseparably linked to equipment and the environment. Electricity safety accidents are not rare in causing loss of life and property. The neural network algorithm-based power security system uses the analytic hierarchy process to layer multiple logical structures of the power grid, evaluates the factors that affect safety, obtains the weight of each influencing factor, and selects the higher impact on power system safety interference according to the weight Factors. Now neural network algorithms have begun to be widely used, and electrical safety systems based on neural network algorithms play a significant role in power safety. Combining neural network algorithms with power safety protection systems can effectively guide functions such as aging monitoring, life prediction, and fault identification of power equipment, and can also improve the accuracy of power system reliability assessment.
P-Fe alloy as anode materials for lithium ion batteries: a first-principles study
Authors: Huang Zhaowen , Xiao Wenping , Li Jingyang , Zhao Lingzhi
Published: May 2020

In this paper, based on first-principle plane wave method, P-Fe alloy interphases were studied as anode materials for lithium ion batteries. The results show that the incorporation of Fe can effectively reduce the lithium intercalation potential of P-Fe, improve the conductivity of P, and provide more lithium intercalation gap positions to enhance the specific capacity of the P-Fe alloy anode materials.
Design of new energy-saving and environmental protection harrow suction dredger system
Authors: Jing Shiqiang , Liu Lu
Published: May 2020

This project is to design an adaptive new rake suction dredger operating system based on soil and terrain conditions. The design is combined with high pressure water gun cutting and new rake heads. Adaptive high pressure water guns are installed on both sides of the rake head. After the substrate is cut in blocks by a high-pressure water gun, the new rake head digs it up more easily and sucks it directly into the mud tank through a high-pressure centrifugal pump. The device has strong adaptability, environmental protection, energy saving and high efficiency, and has broad prospects for popularization and application.
Photovoltaic Power Forecasting Based on SVM Optimized by Improved ABC
Authors: Liu Lin , Lu Yanyun , Li Shuqin
Published: May 2020

In order to improve the accuracy of photovoltaic power output prediction, a photovoltaic power prediction method based on similar days and improved artificial bee colony support vector machine is proposed. Firstly, through calculating the Euclidean distance of history day and measured day meteorological factors to determine similar days. Secondly, select historical data of photovoltaic power output, temperature, humidity and daily radiation on the slope of similar days and temperature, humidity and daily radiation on the slope of test date as input variables of support vector machine. And we adopt the improved artificial bees colony to optimize kernel function parameters and the penalty factor of support vector machine. Finally get the output in each period of photovoltaic power prediction. The experimental results showed that the proposed method can effectively improve the prediction accuracy of photovoltaic power.
Effect of calcination time on the electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode materials
Authors: Bai Xue , He Rui , Zhang Lihui , Liu Zhenfa
Published: May 2020

The layered Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode materials were synthesized by a solid-state method at different calcination times. The structure, morphological and electrochemical performance of the synthesized materials were studied by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and galvanostatic charge-discharge tests. The results indicate that the sample prepared at 20h delivers higher rate capacities of 184.8, 182.8, 171.2, 158.3, 142.8, and 116.4 mAh g−1 at rates of 0.1C 0.2C, 0.5C, 1C, 2C, and 5C, respectively. And the sample prepared at 16h exhibits better cycle stability than others.
Analysis on the Construction Strategy of Building Electrical Engineering with Intelligent Technology
Authors: Yin Chunliang
Published: May 2020

Nowadays, the increasing development of China’s society has promoted the rapid progress of the construction industry, further improved the level of construction technology, and made it present the characteristics of diversified development. At present, the internal connection between electrical engineering and intelligent technology is getting closer with the rising level of science and technology, and intelligent technology is used through the beginning and end of building electrical engineering. In order to further explore the construction strategy with intelligent technology of building electrical engineering, this paper analyzed the basic introduction, application characteristics, application status, technical key points and solutions strategies of building electrical engineering, attempting to improve the construction effect of building electrical engineering with intelligent technology.
Study On Fast Optimization Method Of High Efficiency Adjustment Well Near Fault
Authors: Zhenhai Jiang
Published: May 2020

The edge of the fault is a concentrated area of remaining oil in the stage of extra high water cut, but with the deepening of the potential tapping work in recent years, it is difficult to select potential wells in the fault area, and the benefit of the effect is decreasing year by year. In this paper, by comparing the relationship between the effect of high efficiency wells that have been put into production in fault area and the development factors, the technical process of high efficiency well potential optimization is established, and a set of high efficiency well potential optimization software system is developed, which is more than 5 times higher than the efficiency of manual well selection, which proves the effectiveness of this method.
Determination of taurine in dried sha-chong (Sipunculus nudus) by high performance liquid chromatography
Authors: Ye Hongli , Tian Liangliang , Cai Youqiong , Huang Dongmei , Shen Zhaodong , Shi Yongfu
Published: May 2020

The paper studied the determination of taurine in dried sha-chong (Sipunculus) by high performance liquid chromatography. The method showed the wide detection range from 0.0 to 500 μg/mL with the linear depentdent codfficient of 0.9965 with the limit of detection (LOD) 3.74 ng/mL (S/N=3) and the precision of 4.39 % (relative standard deviation, RSD). The standard addition recovery rate was between 82.5 % ∼ 101 %. Finally, the method was successfully applied in detection of the taurine in dried sha-chong and other aquatic products.
Design and Research of Marine Nuclear Power Platform Engine Room Ventilation System
Authors: He Meikui , Liu Qian , Gui Ting , Fang Zhen
Published: May 2020

Engine room ventilation system is an important power assist system on marine nuclear power platform. This paper summarizes the development of the engine room ventilation system at home and abroad. The principle of Engine room ventilation system on marine nuclear power platform is researched. This paper takes diesel engine room ventilation system as an example, introduces the design method of engine room ventilation system commonly used on offshore platform and ships at present, and calculates the total ventilation rate of the whole engine room which can maintain the demand for full load work. According to the characteristics of the diesel room of the platform, the suitable ventilation and distribution mode of engine room are determined, including the selection of ventilation mode, the type of air inlet and outlet of the engine room. Based on project example, the core design ideas of ventilation system for engine room are introduced in detail, can provide guidance for the future design of engine room ventilation system on marine nuclear power platform.
Machine learning approaches for estimating building energy consumption
Authors: Liu Liangyu , Liu Ningyi , Zhang Yilin , Li Yumeng , Rui Xiaobo , Yang Zi
Published: May 2020

Using building data and corresponding weather conditions provided by ASHRAE, a statistical method that carefully measures features and applies both linear regression and gradient boosting machine models to predict and analyse building energy consumption was developed. Comparison of the predicted and actual energy usage indicates our model can predict energy consumption within an acceptable error range. Such statistical model has the potential to be widely used to monitor energy consumption and measure energy savings for various kinds of buildings in the future. If additional data is available, this method will be more widely applicable to other sectors such as industrial facilities.
Study on the Regional High Quality Development of Energy
Authors: Tan Jian , Su Boni
Published: May 2020

Clean and low-carbon are overall goals of high quality development of energy. Regional development approaches should be chosen according to local situations. Taking Jiangsu Province as an example, this paper focuses on the regional high quality development of energy. The development status and characteristics of energy in Jiangsu are analysed. The amount of energy consumption is large. Coal is the dominating source of energy. Energy cleanliness is already high. A large amount of energy is moving in from other provinces or countries. According to these characteristics, some suggestions on the regional high quality development of energy in Jiangsu are given. Take multiple measures simultaneously to achieve low-carbon energy. Encourage energy cascade utilization to achieve high-efficiency energy. Develop comprehensive energy service to achieve cost-effective energy. The results are also helpful for making energy development plans in other places.
Fracture Modeling and Productivity Prediction Technology of Shale Reservoir Based on Multivariate Data
Authors: Jie Yong , Li Qin , Yiwe Li , Jingyi Li
Published: May 2020

The practice of fracture network fracturing in shale gas layers indicates that the formation of complex fracture networks is directly related to the probability of obtaining a sufficiently large reservoir to effectively rebuild the volume and the ability to obtain high economic benefits. With the continuous deepening of shale gas exploration and development, it is found that the current artificial fractures have slopes, branches and asymmetric distribution. As a result, the production difference between different horizontal wells in the same platform and different fracturing sections of the same horizontal well is obvious. How to optimize the exploration and development plan and promote the economical and effective development of shale gas resources is the most important problem currently facing. The post-evaluation technology of reservoir reconstruction effect has become a key technology. Therefore, it is of great production significance to carry out post-evaluation work by integrating multivariate data. This article takes the SiChuan WeiYuan Shale Gas Demonstration Area as an example, and uses microseismic results and surface seismic data, geology, logging, fracturing and production dynamics data to carry out fracturing fracture modeling and productivity prediction. Provided guidance for fracturing design optimization, development well location, well spacing deployment, and development effectiveness, with good application results.
Application of stable flow energy equation in steam turbine and other power machines
Authors: Wang Yarong , Wang Peirong
Published: May 2020

The stable flow energy equation reflects the general law of energy conversion in the process of stable flow of working fluid, which is widely used in various thermal equipment. This paper mainly introduces application of stable flow energy equation in steam turbine and other power machines. Through the example calculation, it is verified that in the practical application process, the energy equation can be reasonably simplified according to the specific situation, and the calculation can be completed in a simpler and clearer form.
Empirical research on electric fire extinguishing performance by application of water-based fire extinguishing agent
Authors: Wang Shuai , Wang Xiaojun
Published: May 2020

This paper illustrated a test conducted recently about the application of fire agents in Class E fires. This research carried out the chemical analysis of different agents, and made comparison among water and different fire agents. This research also successfully achieved a good result that cable fire could be put out using extinguishers while the power source is not cut off. This paper also illustrated some prospects about future research.
Study on Risk Assessment of Inland Nuclear Power Investment Construction Projects by Kazakhstan
Authors: Liu Liangyan , Cheng Ming
Published: May 2020

This article is the first attempt to conduct a comprehensive evaluation of Kazakhstan’s inland nuclear power investment construction projects. Based on the summary of existing research results of scholars at home and abroad, a systematic analysis of the sustainable development model is made from the following four aspects to conduct safety evaluation research on domestic nuclear power construction in Kazakhstan: 1) Probabilistic safety evaluation for Kazakhstan’s inland nuclear power construction; 2) Public perceived risk evaluation for nuclear power construction in Kazakhstan; 3) Economic evaluation for recirculating systems of spent fuel; 4) Benefit risk evaluation for Kazakhstan’s inland nuclear power construction. Based on China’s multi-criteria decision analysis of dynamic system modeling, we add noise to the uncertain factors of the safety evaluation of Kazakhstan nuclear power investment projects and then perform noise reduction to refine our evaluation results. First of all, due to the non-convex optimization of tensor decomposition, there is no guarantee that the factorization will be determined by optimization. In addition, tensor decomposition can converge to different local optimal values corresponding to different initial values of the two tensors. Therefore, if the initialization value is set correctly, the result will be approximately optimal compared to the case where the initial value is far from the global optimal value.
Analyze the Layered Structure of the DC Transmission System on The Same Tower
Authors: Maalla Allam
Published: May 2020

HVDC adopts the design concept of a double-circuit erection on the same tower, which can reasonably and efficiently utilize the resources of the ground electrode and the converter station, improve the transmission capacity of the unit corridor, and save valuable transmission corridors, and reduce engineering construction and maintenance costs. Different from the previous single-loop ± 500 kV DC transmission system, DC project needs to implement dual-circuit power control and full-station reactive power control to meet the requirements of the dual-circuit DC power dispatching and the dual-circuit DC transmission to the entire station AC filter.
Study on Failure Mode of Key Parts of High Voltage Transmission Tower under Ultimate Load
Authors: Gao Fan , Ren Yaning , Zhang Deguang , Shen Xiangliang , Wang Lihuan
Published: May 2020

In order to study internal force distribution and failure mode of key parts of high-voltage transmission tower under the action of ultimate load, the micro scale model for the key parts of the tower and the macro scale model for other members are established by the finite element software ABAQUS. And a uniform multi-scale numerical model is established by coupling two scale numerical models. Then apply the limit load on the multi-scale model under the extreme climate condition, and the failure mechanism and failure mode of the transmission tower is obtained under the limit load.
Correlation analysis of mid-deep groundwater chemical composition of Weibei Plain
Authors: Qin Peng , Liu Hongliang , Liang Zhihao , Wu Tao
Published: May 2020

The freshwater and brackish water in the mid-deep layers of Weibei Plain plays an important role in the development of the local economy. This paper uses statistical theory such as principal component analysis, correlation analysis, and stepwise regression to analyze the chemical composition of middle and deep groundwater of Weibei Plain to find the main indicator ions that affect TDS.
Study on Dynamic Prediction Model of Small Reservoir Safety Risk
Authors: Huang Huaai , Feng Jingchun , Song Zhe , Zhang Ke
Published: May 2020

This paper comprehensively uses multi-source data such as small reservoir operation management information and mountain flood disaster investigation information to transform the disaster risk prediction of small reservoirs into disaster risk assessment of easy-to-observe indicators. On this basis, combined with the data of mountain flood investigation and reservoir operation management data, through the expert consultation method, the disaster risk state transition matrix and the disaster risk output matrix are studied and established to construct the Hidden Markov Model of mountain flood disaster risk prediction. Finally, combined with a reservoir in Zhejiang Province, the hidden Markov model constructed in this paper is verified. The verification results show that the model constructed in this paper is feasible and can effectively ze the dynamic prediction of small reservoir safety risks. The research results of this paper lay the foundation for perfecting the safety risk management theory of small reservoirs and realize the dynamic prediction of small reservoir safety risks.
Ecological development of coastal wetland in north coast of Hangzhou Bay of Shanghai
Authors: Li Caixia
Published: May 2020

Taking the north coast of Hangzhou Bay of Shanghai as an example, this paper studies the ecological development model of coastal wetland under the combination of the time background and environmental conditions. In this paper, the coastal wetlands in north coast of Hangzhou Bay of Shanghai were divided into 4 types according to needs, including tourism park, tidal flat reservoir, reed tidal flat wetlands, muddy coastal wetlands. Through the use of case studies, the cases of similar site conditions or environmental issues were summarized, so as to be 4 types of coastal wetlands to find more suitable ecological development measures to provide reference for decision makers and builders.
Study on the Application of Flat Dilatometer Test in Subway Survey Engineering
Authors: Zhao Zhonghua , Lu Fatan , Yue Chuanyun
Published: May 2020

Flat dilatometer test (DMT) is a new kind of technology in situ test. This study, through sorting out and analyzing the flat dilatometer test data in subway engineering, obtains the experience of the application of the flat dilatometer test in engineering, and solves practical problems such as soil classification. The results of this study provide an effective basis for the application of flat dilatometer test technology in subway survey and provide sufficient and reliable data for the compilation of regional specifications.
Small temperature difference in the middle and later water cooling stages of RCC dam
Authors: Xue Yifeng , Cheng Handing , Yao Ge
Published: May 2020

Water cooling is the main measure to reduce temperature cracks in RCC dams. But later cooling usually means reducing water temperature rapidly after 120 days of the concrete age, which may cause larger self stress and tensile stress inside the concrete. The small temperature difference cooling can advance the starting time of middle and late cooling stages, and reduce the temperature stress effectively. However, the difference of temperature stress produced by different middle and late stages water cooling methods is large. It is necessary to analyse precisely how to use the small temperature difference methods in the middle and late cooling stages of dams properly. The cooling methods of RCC dam in the middle and late stages are studied by using the self-developed 3-D FEM floating mesh method temperature controlling simulation program. Result shows that when the small temperature difference is used to cool the dam in the middle and late stages, the temperature and temperature stress of the dam reduces obviously. When the age of the concrete is over, the dam should be cooled immediately, several levels of water temperature should be set in the middle and late cooling stages, the temperature of the water should be reduced slowly, which can reduce the temperature and temperature stress of the dam effectively. Study result will provide a favourable reference for practical projects.
Research on EPC Engineering Corruption Risk Prevention and Control Evaluation System
Authors: Zhang Min , Lang Jian , Zhang Jianhao , Shen Qingfei , Wang Yiben
Published: May 2020

The scope of application of EPC model in China is constantly expanding, and the work of corruption risk prevention and control is continuously carried out in the EPC project, so it is necessary to evaluate the corruption risk prevention and control management level in the EPC project field. This paper studies and constructs the evaluation index system of EPC project corruption risk prevention and control, and establishes the evaluation model of EPC project corruption risk prevention and control management level by AHP. Through case analysis, it is proved that the model can effectively evaluate the corruption risk prevention and control management level of EPC project. Supervision based on the evaluation results can further improve the strength and efficiency of risk prevention and control work, and provide guarantee for the healthy development of EPC project.
Research on the Suitable Aging of the Communication Space of the Aged Institutions under the Background of Aging
Authors: Chen Yiwei , Bai Zhonghua , Fu Fei
Published: May 2020

Under the influence of the basic national policy of family planning, family pension is under great pressure, and institutional pension is a main way to solve the problem of population aging in China. Based on the theory of communication space, this paper analyzes the special physiological, psychological and behavioral characteristics of the elderly in two typical elderly care institutions in Chengdu, and explores the communication space design of urban elderly care institutions to adapt to China’s national conditions.
Numerical Analysis on Uncoordinated Deformation in Highway Subgrade Widening
Authors: Tang Lanjun
Published: May 2020

Finite element model of widened subgrade by finite element analysis software is established. The uncoordinated deformation rule of the subgrade widening is studied. By considering the different heights of embankment, different excavated slope, uncoordinated deformation is comparably analyzed. It is resulted that the uncoordinated deformation of the high filling subgrade widening is greater than the one of low embankment widening. The stepper original subgrade excavated slope is, the larger deformation will be on the foundation and subgrade. And uncoordinated deformation is more obvious. Moreover, ground settlement is bottomed at the old road center and it increased with distance away from it. Also, the uncoordinated deformation peaked at the original toe.
Effect of rubber particles on dynamic mechanical properties of ultra-lightweight cement composites
Authors: Wang Fang , Sui Lili , Huang Zhenyu
Published: May 2020

This paper develops a novel rubberized ultra-lightweight cement composites (RULCC) incorporated with different amount of rubber particles and investigates the static and dynamic mechanical properties of the RULCC experimentally. This study shows that the rubber particles have significant effect on the compressive strength, stress-strain curve and failure mode of the RULCC. A volume replacement of fine aggregates with 10% and 20% rubber particles results in a reduction in static compressive strength and elastic modulu. The dynamic experiments show the RULCC is a strain-rate sensitive material and the dynamic stress-strain curves illustrate that the capcity of energy absorbtion of RULCC is better than the composites without rubber particles. The experimental and analytical studies are essential to better understand the fundamental dynamic behaviour of RULCC for its further applications.
Research on Innovation Efficiency of Hubei High-tech Industry Based on DEA and PSM-DID Models
Authors: Fang Ming , Wang Jiawei , Han Dongyang , Wang Yifan
Published: May 2020

This paper uses the DEA-Malmquist model to study the efficiency and changes of the overall technological innovation activities of high-tech industries in Hubei Province from 2010 to 2016, and finds that the total factor productivity of Hubei Province has declined slightly in recent years, and the efficiency of overall technological innovation activities is low, which can be manifested as weak growth of technical efficiency and technological progress level and weak stability. In addition, this article uses the “Wuhan Independent Innovation Capability Enhancement Plan (2013-2016)” to express government support, and uses 60 listed companies in Hubei Province as a sample and uses the PSM-DID model to investigate the effect of government support on the efficiency of corporate innovation, to further verify the above conclusions. The verification results show that the innovation-driven policies of Hubei Province have no significant positive effect on the innovation efficiency of high-tech enterprises
Experimental and analytical study of novel full-scale square steel tubular-UHPFRC grouted connection
Authors: Fan Shiyong , Huang Zhenyu , Sui Lili
Published: May 2020

This paper proposes a novel full-scale square tubular-UHPFRC grouted connection for precast column-column connections. This study examines the mechanical properties of four full-scale square tubular columns fully-grouted or partially-grouted with UHPFRC via experimental and theoretical studies. The experimental program explores the ultimate resistance and failure modes of the grouted connection under axial compressive and tensile loads. The test results show that new column-column connections perform well in its resistance and stiffness while three main failure patterns include punching shear failure of end plate, welding fracture and local buckling of steel tube are observed. The theoretical model on resistance prediction explains the failure mechanisms of new connection well and it is instructive for the detail design of such novel grouted connection.
Research on the influence of frame-core tube stiffness ratio on dynamic characteristics of Super high-rise buildings
Authors: Gao Yanhua , Sui Zhili , Zhang Weihua , Gan Yixiong , Chen Shuaijun
Published: May 2020

The frame-core tube hybrid structure is an important high-rise building structure system which is widely used in the world at present. The stiffness ratio of frame to core tube affects the dynamic characteristics of the structure. In this paper, nine models of concrete-filled steel tubular frame-concrete core tube super high-rise hybrid structure with different stiffness ratios are analyzed by subspace iteration method, and the analysis of the acceleration and displacement response spectrum value of each vibration mode under frequent earthquakes are carried out. The results show that the stiffness ratio has different effects on different modes, the fundamental frequency, natural period, acceleration and displacement response of the structure of the first mode increase with the stiffness ratio increasing, and it is feasible and significant to interpret the seismic response of structures from studying the dynamic characteristics of seismic waves and structures.
Experimental study on the effect of sustained axial compression load at early age on the tensile strength of concrete during late splitting
Authors: Jinping Zhuang , Chen Jianxing , Cai Xuefeng , Qiu Hao
Published: May 2020

In order to study the effect of early-stage concrete loading on the tensile strength of the later splitting, a total of 11 series of specimens were designed. Through the continuous pressure in early age, the effects of early bearing axial compression ratio, loaded time and concrete strength on the tensile strength of concrete during splitting were discussed.A set of sustained pressure device was set up, through which six concrete specimens could be applied continuous pressure force together. The test results show, when compression ratio is less than 0.5, the sustained pressure at early age has positive effect on the late splitting tensile strength. The increase range in the experimental parameters is between 3.7% and 24.5%.