bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling and Verification of Corrosion Expansion Crack in Reinforced Concrete
Authors: Zheng Bowen
Published: August 2019

Rebar corrosion not only reduces the section of rebar, but also the volume expansion produced by corrosion will cause the protective layer to crack in advance, and produces corrosion expansion crack. In this paper, the corrosion expansion process of concrete was analyzed by the equivalent perimeter hypothesis, the width where corrosion products flow into crack in the corrosion process was considered, the relationship between existing joint displacement and corrosion rate was corrected, moreover, the relationship of corrosion expansion crack and corrosion time and corrosion rate was established, compared with the existing data and the rationality of the model is proved.
Study on Polymer Flooding Objects and Utilization Limits of Three Types of Oil Layers in Daqing Oilfield
Authors: Wang Min
Published: August 2019

In the Daqing Oilfield, the oil flooding of one type of oil layer was transferred to the subsequent water flooding, and the third oil recovery object gradually transferred to the thinner and worse two or three oil layers. Although the three types of oil layers are thinner and have lower physical properties, their reserves are large, reaching 1.86 billion tons, accounting for 44.6% of the total reserves of the Lamadian Oilfield, Sarto Oilfield, Xingshugang Oilfield. It is the sustainable development potential of the oil fields after the second type of oil layers. Aiming at the characteristics of three types of oil layers, such as thin oil layer, poor physical property and scattered distribution, it is determined that it is suitable for polymer flooding to develop reservoir objects and their utilization limits. It is one of the difficult problems for the three types of oil layers to further improve oil recovery.
Study on recovery feature of the weak base ASP flooding
Authors: Liu Manyu
Published: August 2019

A block and B block are two weak base alkali-surfactant-polymer (ASP) flooding blocks. These two blocks have received a good effect by enhancing oil recovery over 20 percent. Based on depth analysis of the dynamic variation rule of these two blocks, summarize the exploitation characteristic, such as the injection-production capability, the section exploitation, produced chemical agents feature and scaling situations. It is concluded that the weak base ASP flooding is more suitable for industrial promotion owing to its strong injection and production ability and light scale degree. The understanding can be used for reference for the follow-up promotion of the weak base ASP flooding.
Analysis on Characteristics of Provenance of Antimony in Western Guizhou, China
Authors: Cui Tao
Published: August 2019

It has concluded that the provenance of antimony ore in western Guizhou are as follows together with the previous researches: 1) the mineralization of antimony in western Guizhou is a long, complex process with different sources in various stages. 2) the main sources of antimony may differ in areas. Metallogenic material is provided for the formation of antimony by the “Dachang Layer” and “hydrothermal process”, the area overlapped by both is beneficial for forming antimony with high grade. 3) there may be some other factors providing the metallogenic material or participate in the formation of antimony, such as “oil-gas reservoir”, however, further researches are still needed.
Research on Optimal Design of Foundation Pit Anchor Support based on Improved Particle Swarm Optimization
Authors: Yang Zhuo , Dong Xiaobin , Xie Ding , Cao Jiaqiang
Published: August 2019

The engineering technology of deep foundation pit support is complex and comprehensive, and it is necessary to consider the relationship between safety and engineering cost, and the optimal design of foundation pit support is especially important. Anchor support is a common support way for deep foundation pit support, in allusion to the shortcomings of particle swarm optimization; this paper adopts genetic algorithm, step length acceleration method and improved particle swarm optimization to carry out optimal design for foundation pit anchor support. The optimization results show that the combination with genetic algorithm improves the diversity of particle populations, the particle swarm optimization combined with the step length acceleration method has faster convergence performance, and the mathematical model of anchor supporting structure design is established. Through the case study of the foundation pit support of the super-high-rise building with frame shear wall structure, it was found that the engineering cost of the improved anchor support scheme after the improved particle swarm optimization is lower. The research in this paper provides a mathematical model for foundation anchor support.
Coalbed Gas and Shale Gas Resource Prospect of Heyang-Hancheng Area
Authors: Liang Min , Liang Hui , Yuan Jinhui , Fan Yuhai
Published: August 2019

As an important coal production area, Heyang-Hancheng has already reached coalbed gas exploration stage. However past study had been focused on coal resources survey; systematic oil gas resources assessment had never been conducted. Based on sediment environment research, this paper using field coal survey data combined with source rock organic geochemistry analysis, argillaceous shale and coalbed aero field absorption and resolve tests, isothermy absorption tests, coalbed gas well logging and gas well logging methods etc. to assess the coalbed gas and shale gas exploration prospects. Resource rock of this area is widely distributed and rich in organic matters, has plenty of type II kerogen, and its organic maturity reaches post mature dry gas stage; thus, has sound hydrocarbon production potential. Both coalbed gas well-logging and isothermy absorption indicated gas content has reached resource evaluation criteria; both shale gas in-situ desorption and gas well-logging show existence of gas, and the natural gas is mainly methane (CH4) with heavy hydrocarbon component.Introduction. Locates at the intersection of Hancheng and Chenghe Mining Area in Weibei Coalfield in Hancheng City and Heyang County, the study area has a width of 20.14km from east to west, length of 22.58km from north to south, with an irregular shape and has a total area of 300km2. The area, rich in coal resources, is an important coal resource producing area with widely distributed coal-bearing construction and good continuity. The loess covers a large part of area, and the bedrock is intermittently exposed along the valley. The structural position is in the turning position of the anti-“S” type head in the Weibei coalfield, which is not conform to the monoclinic structure of the NW or NNW, and the dip angle of the stratum is 3°∼7°. The faults are all normal faults, with strike of NE or NEE, usually less than 10 km, the section dips NW, and the fault scale is generally tens of meters to more than 100 meters. The northern fault is mostly southward, and the southern fault is mostly northward, which together forms the NEE direction asymmetric composite garben structure.
Study on Influencing Factors of Heavy Oil Waterflooding Development
Authors: Tang Guangliang , Xue Liangyu , Zhou Tao , He Shan , Song Mingyao , Li You
Published: August 2019

In this paper, the influence factors of development effect of heavy oil reservoir by water flooding are analyzed and studied by numerical simulation technology. The results show that: (1)with the increase of crude oil viscosity, reservoir recovery decreases gradually and development effect becomes worse; (2) for heavy oil reservoirs with different viscosities, recovery increases at first and then decreases slowly with the increase of permeability; (3)water injection development is carried out under different formation pressure maintaining horizontal conditions, the results show that the maximum development efficiency of reservoir recovery is achieved under saturated pressure conditions. The results show that there are optimal injection velocities for different permeability reservoirs, such as 0.06 PV/a for 100 md reservoir, 0.10 PV/a for 500 md reservoir and 0.04 PV/a for 1000 md reservoir.
Definition of Pressure Relief Range and Effect Analysis of Regional Measures in Long-distance Mining of Protective Seam
Authors: Li Siqian
Published: August 2019

Based on the engineering background of the protection layer mining of the long distance and near horizontal coal seam group in Zhujixi Coal Mine, by means of theoretical analysis, numerical simulation and field investigation, the scope of pressure relief protection of the protected layer after the protection layer mining is studied and determined, and the effect of regional measures of surface drilling and underground perforation extraction measures is evaluated. The results show that the pressure relief angles in strike and dip directions are 63.7° and 80.8° respectively. The maximum residual gas content is 5.28m3/t and the gas extraction rate is 81.4%. The pressure relief protection effect is remarkable, effectively eliminating the outburst risk of the protected layer.
Research on Safety Assessment Method and System of a Heightened Concrete Face Rockfill Dam in Zhejiang Province
Authors: Fang Chunhui , Wang Xue , Wu Liqiang
Published: August 2019

In view of many special analysis and long working period of the dam safety appraisal of water conservancy system, taking a heightened concrete face rockfill dam in Zhejiang Province as an example, starting from the analysis of the main impervious structure system affecting engineering safety, comprehensively using safety monitoring, inspection and detection methods, a relatively convenient and efficient dam safety assessment method and system has been established. The evaluation results show that the concrete face rockfill dam can play functional benefits according to design requirements, and the safety condition is good. The evaluation conclusion is of great significance for the reservoir operation management unit to quickly grasp the dam safety traits. The evaluation method and system have reference significance for the continuous development of the dam safety appraisal work in new era.
Prediction Mine Water Inrush by Set Water Corridor Method and Comparison Method
Authors: Shi Chen
Published: August 2019

Set water corridor method and comparison method have been used for predict the mine water inrush in coal mine mining widely. In this paper, these two methods were used to calculate the water inrush from the first mining face of the Taran Gale coal mine.
Concrete Construction of Flood Discharge and Sand-washing Sluice Bottom Slab of Angu Hydropower Station
Authors: Chen Jie , Xu Xiaoyi
Published: August 2019

Based on the analysis of the concrete construction of the bottom slab of flood-discharge and sand-wash sluice in Angu Hydropower Station, this paper expounds the construction characteristics and difficulties, construction procedures, concrete construction of concrete stilling pool in conventional position, concrete construction of overflow and retaining wall, concrete construction methods and measures in special position, etc. Especially, the concrete stratified partition of the bottom slab of flood-discharge and sand-wash sluice and the typical partition of stilling pool have their unique features. The overflow surface concrete adopts self-designed, processed and manufactured stereotyped drawing dies. And after concreting, we use bamboo springboards and protective measures to keep warm in time. The construction scheme is reasonable in design, meets the requirements of construction progress, has no safety accidents, and achieves good construction effect. It has certain reference value for the concrete construction of bottom slab of flood discharge and sand washing sluice of similar projects.
Organic Modification of Inorganic Ions (Montmorillonite, Hydrotalcite) and its Application in Polylactic Acid-based Nanocomposites
Authors: He Shimao
Published: August 2019

In order to understand the organic modification of inorganic ions (montmorillonite, hydrotalcite) and its application in polylactic acid-based nanocomposites, and to explore the hot issues in this field, the mechanical properties, thermal stability, crystallization properties, ultraviolet shielding properties, rheological properties, flame retardancy and degradation properties of inorganic ions added to polylactic acid after organic modification were expounded. It will provide the development direction for the organic modification of inorganic ions and their application in polymers in the future.
Soil Quality Analysis in Newly Increased Cultivated Land
Authors: Liu Zhe , Wang Huanyuan
Published: August 2019

In order to explore soil physical-chemical properties and water quality in Bailiang town, Heyang county of Shaanxi Province, the soil physical-chemical properties of newly increased cultivated land, the water heavy metal contents of chromium, copper, zinc, arsenic, selenium, cadmium, mercury and lead of Yellow River water and groundwater in the project area were measured. The results showed that the pH value, total salt content and heavy metal content of the Yellow River and groundwater were all in line with the farmland irrigation water quality Standard, which could guarantee irrigation use. The type of soil in the 0∼30 cm was sandy loam, the bulk density of 0∼30 cm soil layer was 1.52 g cm−3, and the saturated hydraulic conductivity was 229.41 cm d−1, which could meet the needs of planting soil quality requirements, but sandy loam soil with large saturated water conductivity was easy to leak water and fertilizer. Meanwhile, the content of exchangeable calcium of 0∼30 cm soil layer was in a very rich state(38.6∼90.1 cmol kg -1), and the content of available potassium (36∼128 mg kg−1)and effective boron(0.56∼0.89 mg kg−1)were moderate, the content of organic matter(1.06∼2.65 g kg−1), total nitrogen(0.18∼0.33 g kg−1), available phosphorus(3.2∼8.4 mg kg−1) and available silicon content(41.0∼68.6 mg kg−1)were in a state of lack. These results indicate that the organic fertilizer, green manure, straw and small amounts of fertilizer could be used to increase the content of organic matter, and other nutrient elements in the cultivated layer. It was recommended to design the loess tillage layer and plow pan layer, which played the role of water retention and fertilizer retention, and was suitable for the growth of aquatic crops.
Study of Unequal Speed Leveling Of Pulverized Coal Piping in Cold State
Authors: Zhang Tianyu , Wu Feng , Zhao Xi , Zhao Zhenning
Published: August 2019

Thee equality of flow of coal powder and wind in each pulverized coal piping makes great differences on the heat flux uniformity in combustion chamber. Thus, a common way to ensure the equality is to change the opening degree of the adjusting holes on the piping to get equivalent wind flow in cold state. However, the operating condition of the piping is in hot state with coal powder, which changes the resistance characterizes in each piping. Present paper casts light on the calculation method of unequal speed leveling in cold state, in order to get equivalent wind speed in hot state with powder.
The Applicability of Soil Density Gauge in The Detection of Non-Cohesive Soil
Authors: Li Zhen , Wang Zhengjun , Xiong Aoyun
Published: August 2019

With the needs of engineering construction, non-cohesive soil has been widely used in important fields such as dams and roadbed filling. The strength and compressibility of non-cohesive soil mainly depend on the compactness.However, it has so far been difficult to find a method for determining the compactness of non-cohesive soil quickly, accurately and safely.In order to cope with this problem, this paper focuses on the working principle and operation process of the SDG200 soil densitometer.At the same time, on the basis of summarizing the previous research, it is pointed out that the difference between the operation of clay soil and non-cohesive soil density is tested by SDG soil densitometer, and the parameter setting problem in the non-cohesive soil compactness test is solved.Therefore, it can be predicted that the SDG soil densitometer will have a good application prospect in the detection of non-cohesive soil compactness.
Ecological Development and Design of River Beach Land in Heyang Section of The West Bank of The Yellow River
Authors: Lu Nan , Wei Yang , Wang Qilong , Li Gang
Published: August 2019

In order to optimize the allocation of soil and water resources and improve the efficiency of agricultural production and the efficiency of agricultural production, with restoring the ecological function of the Heyang section of the west bank of the Yellow River, parts of the river beach land were treated as the high-quality farmland. By the implementation of the main and auxiliary projects for the organic reconfiguration of soil along the yellow beach in Heyang. The flood land was governed as the wetland agricultural area including the paddy field system, drainage system and the road system. Strengthened the policy of making up balance of the cultivated land and the thesis of general secretary Xi. Simultaneously, the goal of developing the arable land resources and protecting the ecological environment were achieved.
Research on The Exploration Technology and Method of Natural Gas Hydrate in China
Authors: Zhang Baojiang
Published: August 2019

new clean energy is essential for the rapid development of society. The appearance of natural gas, water and materials can timely alleviate the energy shortage in China. Natural gas water and substance is a kind of clean energy formed by hydrocarbon gas molecules such as water and methane under high pressure and ground temperature. At present, the main methods of land gas hydrate exploration are: high-precision seismic exploration technology, geophysical logging technology, geochemical exploration technology, remote sensing detection technology, audio magnetotelemental technology, and ultrasonic ground penetrating radar technology. In this paper, the basic exploration characteristics of different exploration technologies are introduced, which provides technical support for the rapid detection of terrestrial gas hydrate.
Physical and Chemical Properties and Nutrient Composition of Pisha Sandstone Under Different Temperature and Ph Value
Authors: Wang Luyao , Shu Xiaoxiao , Wang Huanyuan
Published: August 2019

The Pisha sandstone is widely distributed and rich in mineral elements. It has caused widespread concern about how to turn the rich mineral elements contained in Pisha sandstone into an activation state that can be absorbed and utilized by plants. Meanwhile, it will be the focus of this paper that the effect of physical and chemical properties and nutrients of the Pisha sandstone under the various activation conditions, such as pH, temperature and salt solution. We take pH and temperature as examples, the changes of physical and chemical properties, the main nutrients and nutritional level evaluation of the treated Pisha sandstone were studied. The results show that the conductivity of the Pisha sandstone can be improved under acidic or alkaline conditions. The temperature is one of the main factors affecting the content of available phosphorus, organic matter and available potassium of the Pisha sandstone, while the total nitrogen content is little affected by pH and temperature. And the nutrient grade of the Pisha sandstone increases from very low to low Only at 50°C.
Change of Adsorptive Bound Water of Soft Soil in Hangzhou under Typical Loading Conditions
Authors: Zheng Qingqing
Published: August 2019

Adsorptive bound water can reflect the physical properties of soil and affect its mechanical behaviour. Based on the important function of adsorbed water, the change of adsorbed water under three types of load is studied. The undisturbed samples nearby subway in Hangzhou is selected as criterion. Via the volumetric flask method, the content of the adsorbed water and the specific surface area are measured. Compared with the results of undisturbed specimen, this paper evaluated the effect of the impact, vibration and remolded and vibration. The results show that after loading the adsorption water content decreases. Among three types of load, the remolded vibration made the most significant change.
Numerical Simulation and Analysis of Thermal Stress on Restressed Assembly Steel Struts System in Foundation Excavation
Authors: Hu Qi , Zhang Kai , Song Junguo , Fang Huajian , Xie Jiawen , He pinpin , Ran Long
Published: August 2019

When using horizontal internal bracing system in large span deep foundation pit, the influence of temperature effect on bracing system must be considered. Based on the long-term thermal stress monitoring of a project in the west of Hangzhou, this paper studied the influence of Angle brace temperature effect on the foundation pit enclosure structure after excavation to the bottom by using three-dimensional finite element model. When the strut temperature rises, the strut axial force increases. The longer the length is, the higher the axial force rises. The horizontal displacement of the surrounding wall and soil will be in the external direction of the pit, which is conducive to the stability of the surrounding system. The second layer struts are more affected by the temperature effect than the first layer struts, and the combined action of the two struts makes the surrounding wall produce greater displacement. The pouring of the bottom plate makes the strut subject to the temperature effect to generate greater axial force, the second layer struts change more violently, and at the same time reduces the displacement and deformation of the retaining structure. When the temperature drops, the strut axial force decreases and the horizontal displacement of the retaining structure to the pit increases, which is not conducive to the stability of the system. At this time, the reinforcement of the nearby soil body can be considered to reduce the deformation of the soil body and the retaining wall.
Evaluation and Prediction of Water Resources Utilization Structure Based on Projection Pursuit Method
Authors: Wu Jie
Published: August 2019

All Based on the statistics of water use in the past five years, this paper uses the projection pursuit method to evaluate the rational use of water resources in various provinces and cities in China, and establishes corresponding prediction models for the completion of red line indicators. Perform preliminary statistical analysis on the data, select relevant indicators to establish a projection pursuit evaluation model, and use the genetic algorithm to solve the problem, display the projection values of each province and city on the map, and point out the existing problems. Four of the red line indicators were exponentially fitted and predicted. The final water quality compliance rate did not reach the red line target value of 2030, and the deviation from the target was 13.68%.
Research on Watershed Extraction Method Based on GIS
Authors: Li Yanan , Lei Na , Xiong Yufei
Published: August 2019

The Digital Elevation Model (DEM) mainly describes the ground elevation, which contains rich hydrological information and is one of the main data sources for current watershed analysis. This paper takes Fuxian County of Shaanxi Province as the research area, and uses the ASTER GDEM data of 30m resolution, based on the Hydrology module of ArcGIS10.3 platform, after the filling of the earth, the calculation of the flow direction, the calculation of the cumulant accumulation, the determination of the convergence threshold, the extraction of the river network, etc. The method of basin watershed extraction is studied and the characteristics of the basin are comprehensively analysed. The results show that when the convergence threshold is 11000, the extracted river network is closest to the actual river network, and the derivative relationship can be used to determine that the extracted river network reflects the threshold of the real water system
Landscape pattern analysis of urban green space based on the new green space classification standard Take Danzhou City, Hainan Province as an example
Authors: Liao Jiaqi
Published: August 2019

This study takes the urban center of Nada, Danzhou City, and Hainan Province as the research object and uses GIS technology and the principle of landscape ecology to analyze the urban green space and landscape pattern of public green space of the central city. The results show that the land scape structure of the central city is unreasonable, the public green space is seriously lacking and the distribution is not balanced. The proportion of regional green space is high and the available space is large; the landscape diversity index is 1ow and the degree of fragmentation is high.
Discussion on Process Design of Zero Discharge of Wastewater in a Power Plant in Northwest China
Authors: Xue Fangming , Chen Feng , Su Jingcheng , Sun Yiqing , Liu Xiuru
Published: August 2019

This paper analyzes the water balance test report of a power plant in Northwest China, the relevant operation records and the statistical wastewater volume of various types of renovation projects. From the technical and economic point of view, the two-step process of optimizing utilization and deep treatment is proposed, and two design techniques are given. Discuss its options.
Preparation of Novel MOF with Multipolar Pore and Adsorption Properties of VOCs
Authors: Chen Dingsheng , Li Yiting , Zhong Xiamei , Zeng Huanmu , Chen Zhihang , Tang Zijun , Cen Chaoping
Published: August 2019

MOF-5 crystals were prepared by solvothermal synthesis, and characterized by electron microscopy (SEM), X-ray powder diffraction (XRD), and specific surface area (BET). The adsorption of formaldehyde, acetone, glycerol and toluene were studied. The effects of reaction solvent ratio, adsorption time and synthesis temperature on adsorption were investigated. The results show that the reaction solvent ratio is 2.6, the crystal particles have good integrity, the cracking phenomenon and aggregation phenomenon are less, the size is more uniform, highly crystalline, the specific surface area and pore volume are larger, and the pore size distribution is more concentrated. The adsorption time is 48 h, the synthesis temperature is 95°C. Under high temperature conditions, MOF-5 has a high-dimensional skeleton crystal structure with higher specific surface area and pore volume. MOF-5 has the best adsorption effect on toluene.
Design of hull ultra high-pressure water ejector derusting system
Authors: Wang Zhi , Fang Suyi , Zhu Faxin , Wang Weijun , Li Yule , Chen Tian , Wang Jiahon
Published: August 2019

In this text, the system takes the hull of the 82000 DWT bulk carrier as the research object, this system analyses the common methods and existing shortcomings or problems of the existing hull rust removal methods. In view of the shortcomings or problems of these methods, the design requirements of the hull rust removal system are set out. Based on AutoCAD design platform, a high-pressure water jet rust removal system is designed, its working principle and main components are introduced, and the main parts of the system are selected for calculation.
Research on solar radiation error of sounding temperature sensor
Authors: Cao Hongxia , Liu Minming , Liu Xinyu , Wang Zengxuan , Tang Yan
Published: August 2019

The error of sounding temperature sensor with bead thermistor induced by solar radiation seriously affects the accuracy of temperature measurement. To solve this problem, this paper presents a novel numerical analysis method based on computational fluid dynamics to correct solar radiation error. The error thermal analysis model of sounding temperature sensor with bead thermistor is established from ground to 32km altitude with different air pressures, and computational fluid dynamics is employed for numerical simulation analysis of solar radiation error. The solar radiation errors are reported in different physical parameters such as the altitude, the direction of solar radiation and the surface coating reflectivity of sensor. The results show that the solar radiation errors present a nonlinear monotone increasing trend with the rise of altitude. Among the errors caused by solar radiation, the error is biggest in the direction perpendicular to the front of the sensor. The simulation results also indicate that the solar radiation error can be significantly reduced by improving the surface coating reflectivity of sensor.
Performance comparison analysis of cold recycled mixture of emulsified asphalt using 100% rap before and after the adding of cement
Authors: Li Yanan , Fan Liang , Wei Hui , Zhang Yuzhen
Published: August 2019

Cement can influence the performance of cold recycled mixture of emulsified asphalt (CRMEA) significantly. A comparative study on the performances of CRMEA before and after the adding of cement was carried out here. In this experiment, four types of emulsified asphalt were prepared by using four heavy-duty 70# asphalt as the raw materials. These emulsified asphalt were blended with 100% reclaimed asphalt pavement (RAP) when no cement was added or 1.5% cement was added. Specimens were made by the improved Marshall test method, and a series of performance characterizations were performed. Results demonstrate that the porosity of the CRMEA is increased after cement is added. The Marshall stability is improved under both 40°C and 60°C, and the Marshall stability under 60°C increases more pronounced compared with that under 40°C. In addition, the splitting strength increases and the bonding performance of CRMEA are enhanced with the addition of cemen.
Synthesis and photo-degradation activity of Zn2GeO4 photocatalyst
Authors: Wan Lijuan
Published: August 2019

Through solution phase route, Zn2GeO4 photocatalyst with the morphology of nanoparticle was prepared. The as-prepared products were characterized by scanning electron microscopy (SEM) and Brunauer–Emmett–Teller (BET) surface area measurements. The results revealed that Zn2GeO4 nanoparticles with higher surface area have higher photocatalytic activity in photo-degradation of MO than Zn2GeO4 prepared through solid-state reaction.
Comprehensive Waterproof Technical Research on Underground Fabricated Metro Station
Authors: Zhang Junjie , Wang Qingbiao , Zhu Qingkai , Xu Shuyi , Shao Tangsha , Kong Qingli
Published: August 2019

With advantage in high-speed construction, prefabricated metro station becomes an important trend in the development of underground space structure. But there are only few researches on water seepage and leakage problems of prefabricated metro station, so it is of great importance to improve the waterproof construction technology. This paper makes theoretical analysis according to concrete structural self-waterproofing and studies the waterproof technology of fabricated metro station in tunnel. With showing the effect of comprehensive waterproof technology by project cases, the corresponding waterproofing measures can effectively solve the waterproofing problem of underground assembly Metro station, and provide technical reference for solving the leakage problem of Metro project.
Application of Improved Particle Swarm Optimization Algorithm in Converter Differential Pressure
Authors: Liu Chuanwu
Published: August 2019

In view of the characteristics of nonlinear, time varying and large disturbance of converter pressure difference control object. The control scheme of the converter differential pressure is analyzed. An improved particle swarm optimization algorithm (ISPO) is used to optimize the PID parameters of the converter differential pressure controller, which enhances the adaptive ability of the PID controller. At the same time, the inertia weight w adopts a nonlinear decreasing strategy and increases the extreme value perturbation operator. The evolutionary stagnation step t is set as the threshold value, and the individual and global extremum of the PSO are randomly perturbed by the extreme value perturbation operator, so that the system is always in an unbalanced state, In this way, the PSO algorithm is prevented from falling into a stagnant state, a new search path and domain are generated, the optimization of the three parameters of the PID is accelerated, and the probability of obtaining the optimal solution is greatly increased, and the optimization of the three parameters of the PID is accelerated. Finally, the simulation analysis and engineering application of matlab show that compared with the conventional PID control, the improved differential pressure of the converter controlled by the improved particle swarm optimization algorithm has the advantages of small overshoot, short adjustment time, good stability and strong antiinterference ability.
Research on the protection of pipelines with multiple column separation and water hammer of cavities collapsing
Authors: Zhao Li , Yang Yusi , Wang Tong , Wu Rongchu , Wang Pengli
Published: August 2019

In long distance water transfer project, pipeline fluctuation, easy to produce multiple column separation phenomenon, then the water hammer of cavities collapsing is greatest harm to the pipe. Summarizing the previous research results, mechanism analysis of water hammer of cavities collapsing and theoretical calculation model, and introduces the main protective equipment and boundary conditions. After long-term practice, constant speed buffer air valve and Two-way Surge Tower effect remarkable on water hammer of cavities collapsing.
Research Progress on Propellant Wastewater Treatment Methods
Authors: Li Ying , Shen Yong , Li Bentao , Huang Hui , Liu Xia , Gong Chen
Published: August 2019

The main treatment techniques of propellant wastewater, including red smoke nitric acid oxidant wastewater, hydrazine fuel wastewater, mixed amine and fuel wastewater, were reviewed. The mechanism, treatment effect, advantages and disadvantages of various methods were summarized and analyzed. The physical method is inefficient, the chemical method is prone to secondary pollution, and the biodegradation method has a long period. From an economic and safety point of view, the method of biodegradation or physico-chemical-biological joint treatment is more effective.
Study on evaluation model of soundscape in urban park based on Radial Basis Function Neural Network: A case study of Shiba Park and Kamogawa Park, Japan
Authors: Hong Xinchen , Jiang Yu , Wu Shuting , Zhang Linying , Lan Siren
Published: August 2019

In order to explore whether artificial neural network can simulate and predict the subjective and objective data of soundscape in urban environment, this study developed the subjective and objective transformation model of soundscape in urban park based on radial basis function neural network. The test was conducted based on the soundscape survey data of Shiba Park and Kamogawa Park in Japan. The results showed that the subjective and objective evaluation model of soundscape constructed by radial basis function neural network could predict more accurate subjective evaluation value, the average prediction accuracy rate was 91.23%. In addition, the soundscape in the higher loudness, loudness level and sound pressure level, and the lower sharpness got a higher accuracy, which is beneficial to simulating the tourists’ psychological state of the soundscape. The study proved that the artificial neural network model can provide an effective method for further and more comprehensive acoustical environment research in the future.
Research on Sustainable Development of Event Tourism under Environment-friendly growing path
Authors: Ding Nan , Mi Xue , Zhao Lei
Published: August 2019

This paper analysed environment problems of event tourism what affects the surroundings directly and then studied the corresponding measures by adopting theories and methods of environment sciences. Sustainable development of event tourism was studied by analyzing the system of event tourism. The results showed that there are three different levels of event tourism in Chinese scenic spot with nine major ecological negative impact areas including solid pollutants, light pollution, etc. The disposal of consumables and tourists’ garbage were identified as most serious impact to environment in the whole event tourism in China. Some advices and measures including enhancing the development of sustainable module building materials, optimizing waste treatment system on-site to improve the growing path of event tourism industry and solve the ecological problems in different stages of it.
Study on evaluation of lightscape under forests in urban parks
Authors: Hong Xinchen , Nie Xiaojia , Dai Zhongwei , Lan Siren
Published: August 2019

In order to explore the evaluation system of lights cape under forest in the urban park, an evaluation system of lights cape under forest in the urban park was constructed, which was composed of physical factors, psychological factors and spatial factors and the corresponding 12 indexes affecting the lights cape based on Grey Statistical Theory and Analytic Hierarchy Process. The results show that: 1) Psychological and physical factors are the dominant influencing indexes in the evaluation system, and the weight accounting of these factors is more than 70%. 2) The total weight of illumination uniformity is higher than other evaluation indexes. 3)The important indicators and sub-important indicators that affect the evaluation of lights cape under forest in the urban park are as follows: illumination Uniformity, satisfaction of lights cape, audio-visual coordination, sky View Factor, daylight factor under forests, perception of privacy, perception of security and clear bole height, etc. The evaluation system is expected to provide theoretical basis and effective methods for the future study in urban light environment.
Research on noise characteristics and control technology of heavy haul railway in China
Authors: Shao Lin , Li Yanliang , Chen Yingqing
Published: August 2019

This paper briefly describes the development process and the characteristics of heavy haul railway in China, summarizes the current situation of noise impact of heavy haul railway at home and abroad, and researches on low-noise control technologies of heavy haul trains. The noise characteristics of China’s heavy haul railways were studied through field tests. The results showed that when the passing velocity of heavy haul trains increased from 60km/h to 100km/h, the regression coefficient K of radiated noise and velocity was 20-25. Through the comparative analysis of the noise between the heavy haul train and the freight train, it is proved that the low-noise control technologies have significant noise reduction effect.
Wind Environment Optimization for Sustainable Development: The China Experience in Urban Air Path Planning
Authors: Wang Peng , Jiang Haocheng , Lei Cheng
Published: August 2019

Urban air path planning is an exploration of urban sustainable development by urban planners. With the continuous increase of urban scale and urban construction density, cities in China begin to face the ventilation problem faced by developed countries. The article reviews the process of urban air path research in China and summarizes the current situation of urban air path planning practice in China, in order to provide a reference for other developing countries. Based on the reflection on the development of urban air path, this paper puts forward four suggestions for urban air path construction in developing countries, including formulating formal technical guidelines, integrating with national urban planning system, strengthening the support of wind environment research, and constructing evaluation and feedback mechanism.
Study on Utilization and Pollution of Water Resources in Guanqiao Village of Guangxi Province
Authors: Qin Ruqiong
Published: August 2019

This paper summarizes the present situation of drinking water (groundwater) and agricultural irrigation water in Guanqiao village, existing problems and solutions. And study on utilization and pollution of water resources in Guanqiao village of Guangxi Province. Highlight the seriousness of water shortage and pollution.
Research on Emission Characteristics of Radioactive Resin on Floating Nuclear Power Plant
Authors: Yue Fangyuan , Lei Bin , Sun Haijun , Li Junwen , Gao Shan , Ye XiaoLi , Du Meng
Published: August 2019

The development of floating reactors needs to take into account the marine ecological environment. The recycling of waste in floating nuclear power plant is different from the onshore nuclear power because of its limited space and resources. The purifying resin of primary circuit has a high radioactivity and accounts for a large proportion of floating solid waste, and the production of other radioactive waste generated during resin unloading is worthy of attention. In order to minimize the waste production during emission of radioactive resin, this paper uses the fluid dynamics theory of fluidized bed to calculate and analyze the waste production and emission effect in different media for transportation, and propose a reasonable resin emission program, which can provides a powerful design input for the waste treatment.
Research on Pavement Temperature Prediction Based on Neural Network
Authors: Liu Shouwen , Han Shigang , Chen Huamin , Li Zhen
Published: August 2019

Through data of pavement temperature, air temperature, humidity, wind speed and rainfall in the Dianjiang-Wanzhou section of G42 Shanghai-Chengdu Expressway from 2014 to 2016, it is found from the change law of the pavement temperature of this expressway section that the annual average values of pavement temperature of most monitoring stations gradually lower, but extent is not quite big; the lowest pavement temperature is between -3.2°C and 1.4°C, the highest pavement temperature is 57.9°C to 76.5°C; no matter which season, the pavement temperature and air temperature are characterized by rapid temperature rise after sunrise and significant temperature drop after sunset; the correlation between pavement temperature and air temperature is the best, the correlation coefficient reaches 0.986, and then its correlation with humidity, wind speed and rainfall decrease progressively, and they are -0.467, 0.189, 0.034, respectively. It can be found from the prediction results of pavement temperature in Chongqing Dianjiang-Wanzhou Expressway section based on neural network that the summer error is the largest, the spring is second, the autumn error is less, and the winter error is the smallest; from the angle of fitting degree of time series, the autumn fitting is optimal, the spring and winter is second, the summer effect is not good enough; the correlation coefficient between the model prediction sequence and the live sequence of the four seasons is greater than 0.89, and the overall effect is ideal. Through the research on pavement temperature, the cooperation between meteorological department and transportation departments can be strengthened, accident losses can be reduced, and the maximum benefit of road transportation can be brought into playr.
Research on how to improve environmental protection during fire emergency rescue
Authors: Liu Jiangping
Published: August 2019

With the rapid development of the urban economy, the flow of people in the city has gradually become active, and the amount of urban fires has gradually increased. The difficulty in preventing and extinguishing fires is gradually increasing. How to identify, judge, inspect, analyze and evaluate the factors that cause fires, carry out reasonable operations on the fires after the fires, optimize the firefighting capacity of the fire department, and effectively control Urban fires and the reduction of environmental pollution problems in fire rescue are the most important issues to be solved in the current situation. Briefly introduced the impact of fire accidents on the environment, systematically analyzed the sources of pollution and their hazards in fire accidents, and proposed the pollution control methods in fire accidents in combination with the existing firefighting methods, and made suggestions for improving the environmental protection of fire emergency rescue.
Effect of Electrode Materials on electro kinetic remediation of Uranium Contaminated Soil
Authors: Xiao Jiang , Zhou Shukui
Published: August 2019

In this study, three different electrode materials (graphite, stainless steel, and titanium rods) were used to explore the electro kinetic (EK) remediation of soil contaminated with uranium (U). All EK experiments were carried out in a soil cell reactor with a moisture content of 25.1% and a total uranium mixture of 90.6 mg/kg at a constant voltage gradient (1V/cm) for 5 days. The experimental results show that the EK repair process with graphite rod as the electrode material has the highest current peak, and the overall current level is higher than the other two electrode materials. Compared with stainless steel and titanium rods, the removal efficiency of using graphite as the electrode material U in contaminated soil reached 34.11%. However, the removal rates using stainless steel and titanium rods were lower, 15.79% and 18.77%, respectively. In the EK experiment, the main removal is from the exchangeable part of U to the carbon-bound U composition, while the remaining forms of uranium are difficult to remove under this condition, so in order to be more efficient, the uranium in the soil is removed with maximum reduction. It is necessary to use it in conjunction with other enhancement technologies.
Simulation Study on Exhaust Effect of Common Exhaust Equipment in Traditional Electrical Manufacturing Enterprises
Authors: Chen Tao , Gao Yang , Sun Chengxun , Liu Sen , Li Hongyan
Published: August 2019

Based on fully understanding of the setting and operation of local exhaust facilities in traditional electrical manufacturing industry, the software FLUENT is applied to simulate the airflow field of universal arm exhaust hood in the process of removing welding dust. And the exhaust effect of typical welding dust universal arm exhaust hood and its influencing factors were analyzed. The results show that the exhaust effect of welding fume is mainly affected by the exhaust wind speed, the size of the hood, the angle between the hood and airflow, the distance from the pollutant source to the center of the hood, etc. When practical operation is feasible, the best combination of exhaust effect and economy is achieved when the vertical upward suction is adopted and the cover opening is 20-25cm away from the solder joint and the exhaust velocity is controlled at 0.4-0.6m/s.
Study on the repair of heavy metal contaminated soil
Authors: Luo Yuhu
Published: August 2019

Soil heavy metal pollution was serious in our country and the soil quality was not optimistic. The heavy metal pollution in the soil was concealment, accumulation, non-degradability, uneven distribution and regionality, which was difficult to treatment. Based on the sources of heavy metals in the soil, the characteristics of heavy metal pollution and potential hazards, this paper briefly analyzed the physical methods to repair heavy metal pollution in soil. Then it summarized the related researches on the direction of soil heavy metal pollution remediation by chemical method, biological method and joint repair method in recent years, and on this basis, the future research direction of soil heavy metal repair was prospected.
Study on the Suitability Technology System of Residential Green Building in Hot Summer and Warm Winter Zone
Authors: He Fang , Fan Fenghua , Zhang Yanfang , Teng Yueya , Tian Lu
Published: August 2019

This paper introduces the key technologies of green two-star residential buildings in Hot Summer and Warm Winter Zone, as well as the green means adopted in the green construction stage, and focuses on the economic and social benefits brought by green building technology in the operation stage. The research content has certain reference significance for the technical selection and implementation of green building in this climate area.