bluuebunny/crossref_metadata_2025 huggingface dataset:
Discussion on dehydration technology of coal mine low-concentration gas reciprocating internal combustion engine
Authors: Wang Xiaopeng
Published: May 2020

Low concentration gas reciprocating internal combustion engine power generation in coal mine is one of the main ways of gas utilization. This paper aims at the technical problem of low concentration gas power generation efficiency caused by large amount of atomized liquid water carried by gas in low concentration gas pipeline. Based on the analysis of the source of low concentration gas liquid water, this paper discusses in detail research progress of dehydration technology for low concentration gas reciprocating internal combustion engine power generation, and key discusses the mechanical separation method, electric refrigeration method, electric refrigeration combined with cold air circulation method and flue gas residual heat variable temperature method for gas dehydration of low concentration gas power generation.
Study of fabrication for antibacterial water filter by loading silver nanoparticles on activated carbon
Authors: Hung Shuo-Ting , Chow Yong-Neng , Zheng Huiting , Li Zhian
Published: May 2020

The aim of this study was to evaluate the use of nitric acid treatment of activatd carbon, and observe whether it can increase the amount of silver adsorption. We used vacuum condition to investigate if we could synthesize higher loading silver nanoparticles. Furthermore, we explored a zero-waste manufacture process and tested its antibacterial activity.
Research on Tangible Indexes of Petroleum Engineering Technology
Authors: Sun Jian , Liu Ke
Published: May 2020

The active effort on the tangibility of petroleum engineering technology is of important significance to the improvement of technological impact and commercial application of oil and gas technology. The evaluation index system for tangibilization of petroleum engineering technology is determined on the basis of technological tangibilization practice of domestic and foreign oil companies. The evaluation system mainly includes four dimensions: market demand factor, technological maturity factor, commercial application factor and business development demand factor. The different dimensions have different variables. The factor analysis method is adopted to calculate the weight of each variable index. Based on examination of credibility and validity, this indexes system is shown to have a good questionnaire structure, facilitating acquisition of respondents’ information and guiding petroleum engineering technological service companies to evaluate whether their own technology needs to be tangibilized.
The Influence of Energy System Model on Renewable Energy Policy Governance
Authors: Cao Haijun , An Yongjae , Kwon Cholu
Published: May 2020

Renewable energy is an effective way to realize the harmonious coexistence of human and environment as well as for sustainable economic development. A basic mission of Energy System Model is to help decision makers in solidly developing, implementing and assessing the impact of energy and climate mitigation policies. This paper focuses on the impact of energy system model on renewable energy policy and how to pay attention to it. That is, what is the influence of DPRK’s greenhouse gas (GHG) emission mitigation model on DPRK’s renewable energy policy governance? This paper describes the renewable energy policy established by GHGs mitigation model in DPRK, and provides a comparative analysis of DPRK’s renewable energy policy framework by 2030. We provide some policy recommendations for medium term renewable energy development in DPRK.
Determination of Effective Components of Scutellaria indica from Different Habitats
Authors: Yu Xiao-Mei , Dan Cao
Published: May 2020

A HPLC method for the determination of three effective components in Scutellaria indica from different habitats was established. Analysis was performed on Waters Spherisorb ODS2 (4.6 mm × 250 mm, 5 μ m) with gradient mobile phase of 0.5% glacial acetic acid aqueous solution-acetonitrile. The flow rate was 1 m L/min and the detection wavelength was set at 275 nm. The results showed that the chromatographic elution curves with good resolution and reproducibility were obtained. By comparing with the reference materials, three effective components were determined, namely, scutellarin, scutellarin and apigenin. The method is sensitive, accurate and repeatable, and can be used for the determination of three components in Scutellaria indica. The results also showed that there were significant differences in the chemical composition of Scutellaria indica from different areas. The quality differences of Scutellaria indica from different areas should be considered in the selection of Scutellaria indica.
New extraction technology and characterization of sodium alginate
Authors: Guo Yanqiu , Zhang Shuping
Published: May 2020

In this paper, the experiment was based on the principle of producing sodium carbonate by the combined alkali method, simulating seawater to absorb carbon dioxide in the air, and producing an alkaline extract solution. The effect of the extract on the extraction rate of sodium alginate was studied and then characterized by Fourier transform infrared spectroscopy and TGA. The viscosity and average molecular weight of sodium alginate were measured by viscometer.
Application of advanced oxidation process combining anaerobic granular sludge on refractory industrial wastewater treatment
Authors: Wang Kun , Wang Zhongquan , Qin Shulin
Published: May 2020

An AOPs of Fe/C micro-electrolysis (FCME) and Fenton oxidation (FO) was combined with anaerobic granular sludge (AGS) to treat recalcitrant pharmaceutical wastewater in this study. The AOPs showed significant COD reduction during both FCME and FO. For influent COD=9000∼11000mg/L, the pretreatment effluent COD could reach below 5500mg/L under 0.6% H2O2 adding condition. And the B/C of pharmaceutical wastewater was improved from 0.11 to 0.37. The subsequent AGS treatment in EGSB got a COD removal rate of 87.1%. The extracellular polymeric substance (EPS) and mean diameter detection demonstrated high stability of EGSB. AOPs with AGS is supposed to be a better option for recalcitrant wastewater treatment process.
The effect of different initiator dosages on the performance of sodium salt of MAA/St/SSS copolymer dispersant
Authors: Zhang Yanyan , Chang Yunping , Zhang Qiang
Published: May 2020

500 g/L atrazine aqueous suspension concentrates (SC) were prepared by using sodium salt of methacrylic acid/styrene/sodium p-styrene sulfonate copolymer (SMSS) synthesized with different initiator dosages as dispersants, and the performances of atrazine SC were evaluated. It is found that initiator dosages have remarkable effect on the performance of SMSS. SMSS has higher performance when the initiator dosage is 4.8 wt. %, and the suspensibility of atrazine SC could reach 98.36%, the syneresis rate is only about 0.5% and the particle size is the smallest.
The pollution characteristics and source analysis of water-soluble ions in indoor PM2.5 during the Spring Festival in Jingyue Suburb of Changchun City
Authors: Li Bai , Li Chunhui , He Zijian
Published: May 2020

The characteristics of water-soluble ions in indoor PM2.5 during the Spring Festival in Changchun City were analyzed by ion chromatography. The results showed that the main water-soluble ionic components in the indoor and non-combustion periods were SO4
2- and Ca2+, and the concentration of Na+, K+, Mg2+, F-, Cl- and NO3
- increased in the fireworks and firecrackers, among which Cl- and NO3
-. The concentration increased significantly compared with the non-combustion period, and peaked with PM2.5 concentration in the first month of the first month and the first month of the first month; the correlation between NH4
+ and SO4
2- during the discharge and non-combustion periods was greater than the correlation between NH4
+ and NO3
-, NH4
+ Sulfate is preferentially combined with SO4
2-, and secondary ions are mainly in the form of (NH4)2SO4 and NH4NO3. Cluster analysis and correlation analysis indicate that the sources of water-soluble ions in indoor PM2.5 during the Spring Festival can be classified into four categories. Biomass combustion source, automobile exhaust gas source, coal-fired emission source and soil dust, among which the main sources of Na+, K+, Mg2+, Cl-, SO4
2- during the discharge period are the fireworks and firecrackers.
A study on Kinetics of Mn2O3 catalytic oxidation about Supercritical (near) critical water of POPs
Authors: Liu Na-Na , Zhong Wang
Published: May 2020

Supercritical(near) critical water oxidation is a green and efficient method developed in recent years for the treatment of organic waste, The kinetics of Mn2O3 catalytic degradation of persistent organic pollutants (POPs) in Supercritical(near) critical water was studied. The reaction order, apparent activation energy and the feedback of three factors on catalytic degradation were determined. The experiment shows that under the conditions of temperature 280∼360°C, pressure 6.9∼ 20.3mpa and reaction time 5∼30min, Mn2O3 and hydrogen peroxide are used as the oxygen source without the catalyst. 4,4 ‘-dibromobiphenyl has a reaction order of 1.71, Apparent activation energy 46.56 kJ/mol; Mn2O3 catalyst was used, the reaction order of 4,4 ‘-dibromobiphenyl was 1.79, and the apparent activation energy was 37.89 kJ/mol. Therefore, Mn2O3 as a catalyst can significantly degrade the activation energy of POPs in near-critical water.
Hydrodynamic characteristics of asymmetric semi-submersible lifting platform
Authors: Yao Zhenqiu , Liu Chuanyi , Ling Hongjie
Published: May 2020

The research object of this article is an asymmetric semi-submersible lifting platform, which is different from the traditional semi-submersible platform. It has an asymmetric lower hull structure. A heavy crane is installed on the right side of the platform body which is larger than the other side. Based on the three-dimensional potential flow theory, the hydrodynamic performance of the asymmetric semi-submersible lifting platform under operating conditions was studied by using the numerical calculation method of the hydrodynamic calculation software AQWA by adding viscous damping coefficients, and multiple wave angles. The RAO response amplitude operator, first- and second-order wave forces, additional mass and other hydrodynamic parameters are used to analyze the characteristics of various hydrodynamic parameters of asymmetric semi-submersible lifting platforms.
The Impacts of Reservoirs on Runoff in the Upper Yellow River, China
Authors: Guo Yan , Hou Suzhen , Wang Ping , Zhao Jun
Published: May 2020

River runoff is an important link in the water cycle that can be adversely affected by the construction of reservoirs. Based on the runoff data from 1950 to 2009 at eight stations in the upper Yellow River, this study investigated on the impacts of the combined operation of Longyangxia Reservoir and Liujiaxia Reservoir on river runoff. The measured series of runoff data for the period after the commencement of combined operation of two reservoirs were restored by adjusting for water balance. The intra-annual characteristics of observed and restored runoff at Lanzhou station and Xiaheyan station were analyzed using Mann-Kendall test and wavelet analysis. There was a significantly downward trend in both runoff series, with abrupt changes in 1986 in the observed data and in 1989 in the restored data. Periodic oscillations in the observed and restored runoff series occurred at temporal scales of 3–5-year, 6–9-year, 14–19-year, and 22–27-year. The observed runoff series at Lanzhou station and Xiaheyan station had periodicities of 25-year, 16-year, 8-year, and 4-year. The restored runoff series at Lanzhou station had periodicities of 23-year, 8-year, and 4-year, and at Xiaheyan station had periodicities of 24-year, 4-year, and 8-year. The results show that the combined operation of Longyangxia Reservoir and Liujiaxia Reservoir contributed to the decreasing trend of river runoff, and leaded to runoff abrupt changes and alterations in the periodic variation.
A Model for Evaluating Climate Change on Fragile States
Authors: Wenya Gao , Yang Bian Jing , Chu Zhao
Published: May 2020

In our paper, we find data of 178 states and then establish a series of models to identify and predict the influences of climate change on states’ fragility. First, we select representative indexes. Then we employ K-means Clustering Analysis method to classify the state’s fragility. Next we conducted collinearity test and parallelism test. Lastly, we made improvements to the model to enhance the impact of climate change on vulnerability.
Design of Household Items Delivery Robot
Authors: Jiao Yuping , Wang Yixian , Shen Musheng , Zou Tian , Tian Chunlai
Published: May 2020

The household items delivery robot is a multi-functional robot mainly facing the delivery and handling of household goods. It can handle a variety of items while delivering them, such as cup cleaning and fruit cutting. It achieves the grabbing and delivery of various items through multi-degree of freedom robotic arms and claw-changing devices. Its versatile internal structure enables clean cups, cut fruit and transport items. The multi-functional robot as mainly household goods delivery service will make people living feeling standards having a greater improvement and bring great convenience to home living.
Strain transfer analysis of substrate fiber Bragg grating sensor in engineering structure health monitoring
Authors: Yue Chuanyun
Published: May 2020

Fiber Bragg grating sensors are usually buried in the matrix or pasted on the surface of the matrix in practical engineering applications. Due to the different physical and mechanical properties of the fiber, the protective layer, the adhesive layer and the matrix material, the measured strain of fiber Bragg grating sensors is not equal to the actual strain of the matrix structure, so it is necessary to correct the measured strain. Based on substrate optical fiber grating sensor as the research object, established the “matrix structure, colloid, substrate, colloid, and fiber Bragg grating sensor of strain transfer model, deduce the substrate optical fiber grating sensor measurement of strain and matrix structure actual strain between the strain transfer calculation formula, and through the finite element analysis and experiment validation of theoretical derivation. Finite element analysis and experiments verify the correctness of theoretical derivation, and the strain transfer formula obtained can be applied to practical engineering.
Analysis on Damage Detection of Gangue Silo and Structural Reinforcement Design
Authors: Zhang Chunmei
Published: May 2020

According to the damage of gangue bunker structure in FengXi coal industry production system in the process of using, through the corresponding instrument detection and data analysis, the reasonable repair and reinforcement design scheme is put forward for the gangue bunker cylinder wall with different degrees of damage such as concrete loosening and falling off, steel bar exposure, corrosion and so on. The research shows that the treatment scheme of adding a whole layer of warehouse wall and connecting it with the foundation and the upper and lower ring beam of the warehouse body can guarantee the strength and rigidity of the warehouse body to the greatest extent and meet the requirements of normal use and safe production of the gangue warehouse. It provides reference for the use and monitoring of other silo structures in coal industry production system.
Research on the Development Strategy of Engineering Cost Consulting Industry under the “Internet +” Background
Authors: Liao Liping
Published: May 2020

With the rapid development of big data, artificial intelligence, cloud computing, and computer network communication technology in the new era, it will become possible to build a unified national engineering cost consulting information platform. Under the “Internet +” background, the development opportunities and challenges of the engineering cost consulting industry coexist. The article introduces the development opportunities of the industry and analyzes the problems and challenges in the development process. It proposes countermeasures in terms of improving services and improving the industry’s integrity system; improving organization and strengthening the standardization of the industry; cultivating talents to form the core competitiveness of enterprises; strengthening management and building an enterprise engineering cost case library; using new technologies, changing working models, and improving service levels. These suggestions is to promote sustainable development of the industry.
Design of indoor model test system for Post-stiffened core lengthened concrete pile
Authors: Li Yue-Ming , Han Shang-Yu , Li Kai-Ren
Published: May 2020

The post-stiffened core lengthened concrete pile is a kind of composite foundation pile formed after the existing concrete core is inserted into the stiffened core lengthened body through the hole. Based on the pile-forming technology and testing needs of the pile structure, a set of indoor model test system is studied and determined. The system is mainly composed of model groove, loading system and measuring system, and the setting of post-stiffening core section can be realized by controlling the filling time of concrete in the existing concrete core position. The displacement test body is set up on the top of the model pile and the soil around the pile, the stress sensor is set in the pile body and the core body, and the earth pressure sensor is set in the soil around the pile. The test system can form the bearing capacity of pile body (including existing concrete pile and stiffening core section) and soil around the pile from multiple dimensions, and realize the test of pile response under different load combinations by controlling the loading process.
Investigation and Research on the Cognition of Traditional Village Landscape Environment Improvement Strategy Based on SPSS Analysis
Authors: Wang Xiaodong , Chen Gang , Wang Xiaomei
Published: May 2020

Xinjiang has a unique geographical climate and natural environment, and contains a large number of traditional villages with distinctive regional characteristics. With the steady implementation of the rural revitalization strategy, the vast number of traditional villages has ushered in a great opportunity for the traditional village landscape revival. Based on extensive fields, the author adheres to the principle of linking theory with practice, and inheriting and protecting both principles. The author investigates and analyzes the awareness of traditional village landscape environmental improvement strategies. Taking Moyu County and Keping County as examples, field surveys, questionnaire design and SPSS cross analysis were performed. The results show that the starting point of the traditional village landscape environment improvement is accurate, the implementation path is reasonable, and the principles are scientific. Respondents from different regions and occupational categories have a high degree of uniformity in the judgment and selection of variable factors, and have harmonious but different characteristics. Because of different knowledge backgrounds, life experiences, professional responsibilities, and environment, the results of variable cross-analysis also reflect a certain degree of focus and difference. Village cadres, people’s teachers, and local people have obvious representativeness and advanced nature.
Empirical Research on Innovation Efficiency in China Based on SFA Model
Authors: Wang Jiawei , Han Dongyang , Wang Yifan
Published: May 2020

To study the specific situation of China’s innovation efficiency over the years, and explore the impact of state-owned enterprise-scale, tax incentives, regional export environment, R&D funds and R&D personnel on innovation activities, this paper selects the panel data of provinces and cities from 2009 to 2015, divides innovation activities into scientific research and development stage and value realization stage, and constructs SFA model for research. The results show that China’s innovation level is in the range of 0.5-0.8, and the overall development is unbalanced and uncoordinated. The government’s capital investment has an obvious promotion impact on the local innovation efficiency, and the effect of other factors varies from stage to stage. Finally, according to the research results, the existing problems are analysed, and substantive suggestions are put forward.
Experimental Research on Inhibition of temperature to inverse martensitic phase transformation of NiTi Shape Memory Alloy
Authors: Yang Zhile , Liu Jinlong , Lin Junqi
Published: May 2020

The effects of temperature changes, load cycles, and amplitude changes on the mechanical properties of NiTi shape memory alloys such as the attenuation of energy dissipation capacity, equivalent damping ratio, and residual strain were studied experimentally. Experimental results show that: under different temperature and amplitude, the shape memory alloy achieves stable performance after 10 cycles, and the attenuation of energy dissipation capacity mainly occurs in the first 6 cycles; as the temperature decreases or the number of cycles increases, equivalent damping ratio tends to decrease; When the temperature decreases near the completion temperature of austenite transformation, the residual strain is significantly affected. Even if the strain amplitude is small, residual deformation accumulation will occur, inhibiting the occurrence of reverse martensite transformation, and it is not good for the super-elasticity of SMA.
Occupants’ Responses to Naturally Ventilated Buildings in Northern Guizhou, China
Authors: Liu Jing , Cai Ting , Xia Yang , Ma Yu
Published: May 2020

With the acceleration of urbanization, suggestions that are based on findings gathering from field studies on building refurbishment, new building design and building operation and maitenance are essential to achieve building energy saving and carbon emmision target. Therefore, a field investigation on thermal comfort and adaptive responses of occupants in naturally ventilated buildings were conducted during winer time in Zunyi. Without central heating system supply, the mean value of indoor air temperature is 14.86°C. But more than half of occupants (57.9%) who were satisfied with surrounding thermal environment. People are active to utilize various strategies to restore thermal comfort of their own. Adjusting clothing levels and using heating devices (e.g. fan heater, portable hand warmer, etc.) are the most popular adaptive behaviours helping them alleviate thermal discomfort caused by lower and humid thermal environment. The aPMV model is developed with adaptive coefficient of -0.33. The findings obtained from this investigation fill gaps in similar researches in northern Guizhou and provide guidelines on building indoor thermal environment improvement considering passive design strategies in this area.
Research on application of O-Cell test in diaphragm foundation
Authors: Huo Shaolei , Dai Guoliang , Gong Weiming
Published: May 2020

O-Cell method with high safety and low cost has been widely applied in many projects compared with the conventional static load test, especially for high bearing capacity deep foundation. It has been applied in building, bridge, offshore wind power foundation, etc. The load-displacement curve of O-Cell test could be well converted into conventional pile top load-displacement curve. Based on different deep foundation styles, the load cell could be manufactured into circle type, rectangle type, bar-type, “L” type, etc. This paper introduces an application of O-Cell test in diaphragm, and the bearing capacity tested is the largest in the world at present with the maximum bearing capacity arriving at 313998kN. The O-Cell method is convenient to obtain maximum bearing capacity of large and deep foundation, an is helpful for designers to design the deep foundation reasonably and economically.
Effect of carbon nanofibers on the pore fractal law of concrete
Authors: Zhang Hengbo , Xu Jinyu , Nie Liangxue
Published: May 2020

In order to explore the effect of carbon nanofibers (CNFs) on the internal pore structure fractal law of concrete, carbon nanofiber reinforced concrete (CNFC) specimens with fiber content of 0%, 0.1%, 0.2%, 0.3% and 0.5% respectively are prepared, the internal pore structures of specimens in each group are analyzed by means of mercury intrusion porosimetry (MIP), and the pore fractal laws are further discussed by introducing fractal theory. The results show that, appropriate amount of CNFs can effectively reduce the total pore volume and the average pore size of concrete, and the inner pore size shows remarkable fractal characteristics, the fitting slope of ln(W

n
/r

n

2) and lnQ

n
can be used as the fractal dimension D

p
of pore surface area; the D

p
decreased firstly then increased with the increase of CNFs content, and the larger D

p
is, the higher the large pore content and the larger the average pore size are.
Seismic Analysis on The Frame Structure Reformed by Cutting off Column and Jacking
Authors: Wang Zhendong , Xu Xinsheng
Published: May 2020

The stiffness of the structure will change after the broken column is jacked up, which directly affects the overall seismic performance of the structure. But up to now, the design method and construction technology of the broken column jacking are not standardized, so it is of great engineering significance to study the seismic performance of the frame structure after the broken column jacking. In this paper, the data before and after jacking and after reinforcement of the whole broken column jacking project of a five-story frame structure in Jinan high tech Zone are simulated and analyzed. Based on the stiffness, El Centro seismic wave, Taft seismic wave and Tianjin artificial wave are selected to analyze the dynamic time history of the structure. Through the study of the change of seismic performance of the structure before and after jacking and after reinforcement, it can provide some guidance for the design and construction of the whole structure jacking.
Research on steel structure technology in civil engineering construction
Authors: Xue Chen
Published: May 2020

In recent years, with the improvement of science and technology level in China, construction technology in the construction industry is constantly improving. In the traditional civil engineering construction, the construction is through the concrete frame structure. Facing the rapid pace of urbanization construction, various new steel structures are applied to modern construction. Although steel structure technology has many advantages, there are still many shortcomings in the application, need improving. This paper discusses the steel structure technology in civil engineering construction.
Influence of Structural Parameters of Cone Piston on Mechanical Properties of Expansion Tube
Authors: Qi Zizhen , Zhang Yuwu , Lin Yuliang
Published: May 2020

Expansion tube absorber is a kind of excellent energy absorption devices owing to its good mechanical characteristics. In this study, the two-dimensional axisymmetric finite element models of expansion tube were established to simulate the influence of length of cone area and radius of cylindrical area on the mechanical properties of expansion tube. It is found that the expansion force increases significantly with the decrease of length of cone area in axial direction. Then, the expansion force reaches a stable value when the semi angle of cone area reaches 45°. The expansion force increases significantly when the radius of cylindrical area increases, but the trend of expansion force-displacement curves does not change. The influence of length of cone area and radius of cylindrical area on the mechanical properties of expansion tube is very regular. The mechanical properties of the expansion tube as absorber are very controllable and versatile, demonstrating that the performance of expansion tube as energy absorber is very reliable.
Particle flow simulation of constitutive behavior of sands
Authors: Zhang Weihua , Zhao Chenggang , Zhang Yinping
Published: May 2020

Particle Flow Code, based on the method of discrete element, overcomes the hypothesis of macroscopic continuum in traditional mechanics model, and can simulate the properties of sands with the linear and the hertz-mindlin contact model in microscopic level. Triaxial shear test of sands is simulated by PFC2D biaxial confined test, and then the effects of microscopic parameters, such as the shear modulus, poisson’s ratio, particle radii, particle shape, contact stiffness, etc., and the confining stress on the macroscopic mechanical properties of sands (dilatancy, phase transformation, fabric, etc.) have been discussed. And finally the microscopic parameters of sand have been calibrated for further study by two contact models respectively.
Analysis and Research on seismic technology in building structure design
Authors: Zhou Chang Xian , Zheng Shao Peng , Ye YouQuan , Wang Hao , Fu Ping
Published: May 2020

In recent years, with the rapid development of China’s social economy, the real estate industry has also ushered in a good opportunity for development. In the building structure, people pay special attention to its safety and stability. From the perspective of the causes of house collapse in China, a large part of it is caused by earthquake, which shows that there are still some deficiencies in the seismic capacity of the building in China. In order to effectively improve this situation, in the actual design of the building structure, it is necessary to comprehensively strengthen the seismic technology in the design of the building structure Use,The following article analyzes and studies this, and the main research direction is the current seismic measures and the main concept design.
Exploration of Engineering Supervision Quality Control Under Uncertain Model
Authors: Xu Xiaona
Published: May 2020

Effective supervision quality control during the construction project implementation is an important measure to ensure the overall construction quality of the project. The effective implementation of the supervision work can greatly improve the overall construction effect of the construction project, can guarantee the construction quality of the project, and at the same time can strictly control the construction cost, construction safety and construction progress. Therefore, the quality control of engineering projects has a crucial role in the construction process of construction projects. This requires an analysis based on the importance of supervision quality control work and the current research status. At the same time, the key points of supervision quality control during the construction process of construction are put forward, so as to give full play to the positive role of supervision quality control work in construction projects and enhance construction projects’ construction level.
Research on Optimal Design of Urban Underground Parking Space
Authors: Fan Fangfang
Published: May 2020

In recent years, with the continuous acceleration of urbanization, underground parking lots have also sprung up and are moving towards intelligence. Due to the rapid development of underground parking lot construction, many problems have also been exposed, such as low space utilization due to unreasonable space design. Therefore, this article optimizes the design of the parking space in terms of the layout of the column network of the underground parking lot, the occupied area of the single parking space, the parking method of the vehicle, and the parking method, so as to improve the utilization rate of the underground parking space resources.
Experimental Study on The Bearing Capacity of Super High Strength Concrete Pole
Authors: Gao Fan , Chai Linjie , Wang Lihuan , Zhang Deguang , Ren Yaning
Published: May 2020

In order to study the ultimate bearing capacity of super high strength concrete pole, the pole type planning and structural design of super high strength concrete pole are carried out. Under the design condition, the ultimate bearing capacity of super high strength concrete pole is tested. By using the finite element software ABAQUS, the finite element model of super high strength concrete pole is established, and the same external load as the test is applied to fit the true type test. The ultimate bearing capacity of super high strength concrete pole is obtained by true type test and finite element numerical simulation.
Study on the hydraulic characteristics of the gradually expanding and gradually contracting watercourse with different width-narrow ratios
Authors: Xueting Wang , Lingyu Huang , Lijian Qi , Yun Zeng
Published: May 2020

The characteristics of the water flow in the gradually expanding and gradually contracting watercourse are very complicated, and the width-to-narrowness ratio has a significant influence on the hydraulic characteristics of the gradually expanding and gradually contracting watercourse. Five three-dimensional hydraulic calculation models with different width-to-narrowness ratios were established to study its hydraulic characteristics. The results show that: (1) river flow gradually appears as the recirculation zone with the increase of the width-to-narrowness ratio. The recirculation zone increases gradually with the increase of the width-to-narrowness ratio and the shapes are different. The flow velocity in the recirculation zone is negatively correlated with the width-to-narrowness ratio. (2) When the width-to-narrowness ratio is small, the shearing force distribution of gradually expanding and gradually contracting sections are basically in “Hump-shape” along the Y-axis; When the width-to-narrowness ratio is large, the section basically shows a trend of “parabola-like” change that increases first and then decreases near the shore, and the average shearing force of the expanding section is larger than that of the contracting section. (3) As the width-to-narrowness ratio of the watercourse increases, the shearing force at the widest part of the river section gradually decreases, and the shearing force of the side wall at the contracting section is larger than that of the expanding section.
Analysis and Determination of early warning index for Mountain Flood Disasters—A Case Study of Yalin River Small Watershed
Authors: Zheng Shi , Lin-lin Hu , Huan-Bao Chen , Hong-xia Tang
Published: May 2020

Determination of the critical rainfall is very important for the influence by mountain torrents with disaster prevention and reduction in significance, which is the priority among priorities of mountain flood early warning work. In this paper, the small watershed of Yalin River as the example, has carried on the analysis and the calculation of flood disaster early warning index. The results show that, the using method is simple and practical, with the certain reference value to the mountain torrent disaster warning.
Overview of Stability and Failure Characteristics of Expansive Soil Bank Slope
Authors: Xueying Zhao , Shunfu Zhang
Published: May 2020

Expansive soil is a type of special clay that expands and softens after water absorption and shrinks and cracks after water loss. It tends to cause engineering accidents such as slope deformation and landslide damage. This paper summarizes the interaction between three engineering properties of expansive soil as well as the slope failure characteristics based on case analysis. In this way, this paper can contribute its share to the design, construction and operation management of the expansive soil bank slope.
Experimental study on seismic performance of shear walls with steel fiber recycled concrete
Authors: Li Xiaohu , Li Lei , Chang Tianfeng
Published: May 2020

The paper studies the seismic performance of shear walls with steel fiber recycled concrete. Four shear wall specimens were designed and manufactured in this paper and tested under low cyclic loading. The effects of waste fiber and recycled aggregate on the seismic behavior of shear wall were studied. The results show that the incorporation of waste fiber can delay the generation of cracks in concrete. The incorporation of waste fiber can improve the bearing capacity and ductility of shear wall to some extent, while the recycled aggregate has little influence on the bearing capacity and ductility of shear wall.
Research on Nanjing Ancient Urban Morphology Evolution Based on Climate Adaptability
Authors: Ruofei Xu
Published: May 2020

Evolution mechanisms and rules of urban morphology were explored mostly from cultural, historical and geographical aspects, but rarely from the aspect of climate adaptability. From the aspect of historical geography, the transition of the Nanjing city came out as the layout changes of the natural and social phenomenon, and combined with the gambling and impelling of the relationship between the human and the nature. The research takes the ancient Nanjing city as an example to analysis the climate adaptability from the site selection and change of the urban morphology., the change of site selection and urban river system were caused by the climatic change, which aroused the continuous change of the urban morphology.
Research on Water Allocation Method of Juzhang River in Yichang City
Authors: Yu Zhiqiang , Wu Jiang , Cao Hao , Hong Xiaofeng , Li Qingqing , Li Ang
Published: May 2020

Water allocation refers to the gradual allocation of the total available water resources or the amount of water that can be allocated to the administrative area, and determines the share of water consumption or the share of water used for living and production in the administrative area. The total amount of available water resources includes the amount of surface water resources and the amount of groundwater resources that can be exploited, minus the overlap between the two. Aiming at the water allocation problem of the Juzhang River, this paper discusses the basic principles of water allocation and the technical route of water allocation plan formulation. A water allocation plan for the Juzhang River Basin was drawn up through steps such as supply and demand forecasting and supply and demand balance analysis. The research can provide a certain reference for the development of water allocation schemes in small and medium-sized river basins.
Research on Hoisting Method of Reinforcement Cage for Underground Continuous Wall
Authors: Liu Mingqi , Dai Bihui , Liu Dewen
Published: May 2020

The hoisting method of reinforcement cage in a diaphragm wall project is studied. Through certain graphic display, the process of hoisting the reinforced cage was described. In this paper, we propose a specific method of hoisting a 880mm thick of reinforcement cage, and the entire specific process and technology of lifting it is also offered. During the hoisting procedure and the lifting transformation process, reinforcement cage hoisting is an important part of construction, and this article has certain reference value to the construction process.
Constructed wetland technology and its application in water quality control of south lake system
Authors: Can Li , Jing Xu
Published: May 2020

Constructed wetland technology is widely used. It has significant effect in the removal of eutrophication factor N, P. From the wetland development and cleansing mechanism of The paper introduces the constructed wetland technology in the use of water treatment of lake form the development of the constructed wetland and the derergency mechanism. The paper especially introduces its application in water quality control of south lake system. In order to analyze the total phosphorus load, it analyze the annual water diversion by the water balance. It discusses the design points of the constructed wetland used in the south lake system. Finally, the outlook of the research in the constructed wetlands and it’s application in eutrophic lake pollution control.
Experimental study on bonding performance of stainless steel bar and concrete
Authors: Qingfu Li , Yihang Kuang , Wei Guo
Published: May 2020

The purpose of this paper is to study the bond behavior between stainless steel bar and concrete. Through the bonding test between reinforcement and concrete, the average bonding force and the distribution of the bonding force between stainless steel bar and concrete are studied. The test results showed that the bond performance between stainless steel bars and concrete was excellent. Within a certain range, the bond performance between stainless steel bars and concrete was proportional to the compressive strength of concrete. The bonding performance of stainless steel bars and concrete was related to the diameter of reinforcement. The larger the diameter of reinforcement, the greater the average bonding stress between reinforcement and concrete. In addition, the area affected by the bonding stress between reinforcement and concrete showed a linear growth trend with the diameter of reinforcement roughly affected as 10 times as the diameter of reinforcements. Stainless bar were similar to ordinary bar, and the peaks of their bond stress with concrete were roughly distributed near the loading end. As the load increased, the effective bond length increased slowly, while the peak stress increased significantly. The peak stress showed an internal shift only when the specimen was near damage.
Research on coupling vibration of hydropower house
Authors: Wei Shuhe , Wang Xin , Zhang Liaojun
Published: May 2020

In order to describe and express the hydraulic vibration source as the exciting force in the vibration analysis of hydropower house, a new coupling method for vibration analysis of house structure-flow passage turbulence is proposed in this paper, and then, the finite element coupling model of Xiangjiaba house is developed. Based on the turbulent field and house structure vibration calculated in the time domain, the coupling vibration relationship between hydraulic vibration source and hydropower house is studied. Fluid pressure fluctuations are mainly caused by low frequency vortex in taper pipe of draft tube and Rotor/Stator interaction; both the low frequency vibration displacements on generator floor which are at primary frequency of 0.625 Hz and 1.25 Hz and the low frequency vibration velocities on generator floor which are at primary of 0.626 Hz and 9.375 Hz are caused by low frequency vortex in draft tube. The results show that the coupling method and corresponding finite element model initiated in this paper succeed in solving the description and expression of hydraulic vibration source. Due to short calculation time and inadequate setting of fluid initial condition, the distributions of maximum vibration value need further research.
Parameter calculation and verification of concrete plastic damage model of ABAQUS
Authors: Qingfu Li , Wei Guo , Yihang Kuang
Published: May 2020

The purpose of this paper is to study the method for determining the parameters of ABAQUS CDP model based on the concrete stress-strain curve provided by the code for concrete structure design. A finite element model was established to calibrate the value of the stress-strain curve cutoff and the damage factor of the concrete, and a calculation method of damage factor was recommended. The results show that the relative errors between first crack load, ultimate load and deflection at ultimate load with the experimental results were less than 5%. It is accordingly concluded that the finite element analysis results adequately reflected the experimental results.
Experimental Study on the Effects of Fly Ash on Sand Fixation with Microbial Induced Carbonate Precipitation
Authors: Biaozhi Zhang , Jiaming Zhang , Guoqing Zhang , Zheng Li , Jikang Zhu , Yang Zhou
Published: May 2020

In order to study the sand-fixing effect of microbe induced mineralization after mixing fly ash with eolian sand, different samples of eolian sand were treated. The effects of blending fly ash on microbially induced mineralization and sand fixation were evaluated based on the comparison of permeability, water retention, surface strength, and wind erosion resistance. After three times of microbial induced mineralization treatment with 30% fly ash contained, it showed:(1)the permeability coefficient decreased by 79.4%;(2) the cumulative evaporation decreased by 26.5%;(3)the surface strength increased by 19.9%;(4)and the wind erosion rate decreased by 21.2%. The yield of calcium carbonate was negatively correlated with the wind erosion rate and positively correlated with the surface strength. From the experiment, it can be concluded that mixing fly ash is more practical than simply using microbial induced mineralization to fix sand, which can significantly reduce the permeability, improve the water retention performance, improve the surface strength and wind erosion resistance of the solidified layer of aeolian sand.
General Analytical Solution to Consolidation of Unsaturated Soil with Vertical Drain considering Drain Resistance
Authors: Qin Aifang , Xu Weifang , Li Tianyi , Jiang Lianghua
Published: May 2020

This paper presented a general analytical solution to consolidation of unsaturated soil with vertical drain considering drain resistance. Based on Fredlund’s one-dimensional consolidation theory and the equal-strain assumption, the coupled governing equations of excess pore-water and pore-air pressures are first decoupled by introducing two new variables. the method of eigenfunction and undetermined coefficients are then used to obtain the general solution under the drain resistance condition. Moreover, the good agreement between the equal-strain results and the typical free-strain results confirms the validity of the proposed solution. The consolidation behaviours, concluding average excess pore-air and pore-water pressures, are investigated against the drain resistance and the ratio of influence radius to vertical drain radius.
Application of Three-Dimensional Design in Substation Design
Authors: Wu Hailiang , Xing Lin , Liu Zhong , Zhang Wuchen , Cheng Nan , Li Teng , Wang Yamin , Zhang Wen
Published: May 2020

With the improvement of design requirements and computer technology, the three-dimensional design with multi-professional collaborative design, refined design and engineering digitization as the core, is being popularized and used in the substation engineering design of State Grid Corporation. This paper analyzes concrete measures, conducts benefit analysis of three-dimensional design in engineering design, and discusses the application of three-dimensional design in substation design combining with practical application cases.
Experimental study on autogenous volume deformation of RCC mixed with MgO
Authors: Nguyen Van-Chinh , Zhang Xiu-Song , Nguyen Van-Nghia , Phan Dinh-Tuan , Liu Gang
Published: May 2020

The application of MgO to control thermal stress for concrete structures has achieved many accomplishments over the years. MgO is an important type of materials for the shrinkage cracking control of mass concrete in general, and Roller Compacted Concrete (RCC) dams in particular. Previous studies have investigated the application of MgO concrete and have proven the cracking prevention of MgO concrete. The purpose of this paper is to measure the Autogenous Volume Deformation (AVD) of RCC mixed with the MgO-expansive agent. And these experiments were conducted under different MgO content, temperature and curing time conditions. The experimental results of the AVD process show that the AVD process increased with the MgO content, curing time and temperature condition. The reseach outcomes are evidence that the hydration of expanded materials in concrete can compensate for shrinkage.