bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on coupling vibration of hydropower house
Authors: Wei Shuhe , Wang Xin , Zhang Liaojun 
Published: May 2020

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.
Study on seismic residual deformation test of reinforced soil
Authors: He Bing , Zhao Jianming , Liu Qiwang , Liu Xiaosheng , Zhu Kaibin , Wang Long , Yang Yusheng , Yang Zhengquan 
Published: May 2020

Abstract
The reinforced material can increase the stability of soil material, improve its shear strength and reduce the residual deformation. In this paper, the vibration triaxial tests of coarse-grained soil under different confining pressure, consolidation ratio and dynamic stress are carried out by using the 100t electro-hydraulic servo large-scale static and dynamic triaxial testing machine of Institute of Water Resources and Hydropower Research. The results show that the average reduction ratio of the axial residual deformation of reinforced soil to that of unreinforced soil is 40%-50%, and the average reduction of the volumetric residual deformation is 30-40% It has a good inhibitory effect. With the increase of confining pressure, consolidation ratio and dynamic shear stress ratio, the axial residual deformation and volumetric residual deformation of reinforced soil increase in varying degrees. The reinforcement effect of geogrid material on soil sample under different conditions is analyzed. The lower the dynamic shear stress ratio and the higher the consolidation ratio, the better the reinforcement effect. The lower the confining pressure is, the lower the reduction ratio of the reinforcement to the volumetric strain is.
System identification from ambient vibration measurements using output-only modal identification techniques
Authors: Ma Jun , Luan Wei 
Published: May 2020

Abstract
Frequency domain decomposition (FDD) method and Random decrement technique are proposed to analyze ambient vibration data. An ambient vibration test was conducted on an 18-story reinforced concrete building, and the proposed methods were applied to estimate modal parameters. The estimated natural frequencies by the FDD method and the RD technique are in good agreement, and comparisons for damping values estimated by the EFDD method and the RD technique show a 72-246 percent difference. The results imply that the proposed methods can accurately evaluate structural dynamic properties from ambient vibration data in a non-destructive manner.
A light piston well-flushing technique for clogged relief wells along Yangxin Dyke of Yangtze River in China
Authors: Tian Mi , Sheng Xiaotao 
Published: May 2020

Abstract
Plastic relief wells along Yangxin Dyke of Yangtze River in China have been seriously clogged in recent years. It is necessary to dredge the wells to restore its disaster prevention and mitigation function. However, traditional piston well-flushing technique is suitable to restore steel and iron wells, and it can cause damage to plastic relief wells. A new light piston well-flushing technique is proposed to overcome the limitation of traditional piston well-flushing technique. The proposed light piston has the advantages of simple structure, convenient use and low cost. By the light piston moving down and up quickly the relief well, the nylon brush can clean the side wall and filters of relief well, and the negative pressure can make the deposited materials in the aquifer and inverted filter sucked out. The proposed well-flushing technique is applied to restore the plastic wells along Yangxin Dyke of Yangtze River in China. Its efficiency is illustrated using field pumping test data. It is shown that the drainage capacity and permeability of clogged relief wells can be greatly improved after using the proposed technique. The light piston well-flushing technique can provide an effective way to restore clogged relief wells along Yangtze River levees.
Water Resources Allocation of the Changjiang To Huai River Water Diversion
Authors: Wu Zhijun , Yan Bo , Cao Hao , Wang Yongqiang , Huang Feng 
Published: May 2020

Abstract
The Changjiangriver to Huai river water diversion project plans to divert water from the lower reaches of the Changjiangriver to replenish water in the middle reaches of the Huaihe river, mainly for the purpose of ensuring urban and rural water supply, developing Jianghuai shipping and improving river and lake ecology. In this paper, we predict the four aspects water demand including domestic, industrial, agricultural and ecological water demand in the river channel in 2030. According to the rules of lakes and water supply projects, we can obtain the water supply under different typical years. The balance of water supply and demand is analyzed for different circumstances. It is concluded that the average annual total water demand in the planned area in 2030 is 18.335 billion m3, the total water supply is 15.356 billion m3, and the water shortage is 2.979 billion m3.
A numerical investigation of seismic performance for an RC frame with latticed concrete infill walls
Authors: Cao Xinyu , Li Xiaojun 
Published: May 2020

Abstract
Expansive polystyrene granule cement (EPSC) latticed concrete wall can be used as an infill wall. After the expanded polystyrene granule cement form has been demolished, the part that remains is a latticed concrete infill wall comprising lattice beams and columns whose cross section is circular with a diameter of 0.12 m. The horizontal and vertical rebar are arranged within the beams and columns. The dynamic responses of a full-scale single-story reinforced concrete (RC) frame with latticed concrete infill walls subjected to earthquake-induced ground motion are simulated using the nonlinear finite element ABAQUS software. This study aims to investigate the effects of different types of earthquakes on the structure and the acceleration responses of the structure. The results obtained indicate that the structure has excellent seismic behavior, although the structural responses vary between earthquakes. This research may help in promoting the design and application of RC frames with latticed concrete infill walls.
A survey on the satisfaction of living environment in old urban residential areas from the perspective of public infrastructure
Authors: Shen Yuchen , Wu Yun , Fang Weimiao 
Published: May 2020

Abstract
Under the circumstance of constantly accelerated urban development process, the old residential areas in urban areas have a lot of problems, such as earlier construction year, longer construction time, aging public infrastructure and lack of public services, etc., which directly affect the satisfaction of residential residents with the living environment. In this paper, a simple data analysis method is used to conduct a questionnaire survey on the residents of Chengnan Garden Residential District, Jiaxing City. The survey results are quantified and analyzed to understand the residents’ satisfaction with the public infrastructure of the old residential district. In this paper, the author analyzes the reasons for the satisfaction, and puts forward transformation suggestions for these problems.
The Critical Buckling Load of Column under Axial Compressive Force
Authors: Xifeng Kang , Xin Guo , Qilei Wang , Qiang Liang , Fang Zhang 
Published: May 2020

Abstract
Recent buckling failures of pipelines in permafrost regions reveal that buckling phenomenon is related to the initial displacement of the pipeline due to frost heave. The aim of this study is to investigate whether this relation influent widely the columns applied axial compressive forces. An apparatus was constructed to measure the loads applied on the specimens and the displacements of the specimens. The curve between the two measurement results are shown to lead to an accurate determination of the critical buckling load. Furthermore, a simulation calculation was conducted through finite element method, the numerical results are consistent with the experiment ones. We found that the critical buckling load is inversely correlated to the initial displacement, and further fitting the curves leads to a linear relation.
Study on optimization technology of protective engineering for submerged tube overburden in crossing river tunnel
Authors: Xiang-yang TU , Xiao-lei Tong , Shi-you GAO , Chen LU 
Published: May 2020

Abstract
Under the influence of many complex factors, such as flood, tidal power, ship operation, earthquake and construction quality, the stability of the tunnel’s underwater overburden layer is crucial to the safe operation of the project. A technical line combined with measured data analysisand physical model testing were utilized to study the features of scouring and sediment for tunnel overburden under several extreme hydrodynamic conditions. In order to ensure the rationtity of anti-scouring stability and economy for tunnel engineering project, optimization design for overburden layer of tunnel was proposed after detailed experiments and analysis. The slurry block stone and stone throwing method can be used to protect the slope and the bottom of the embankment downstream of the tunnel line, which can effectively control the possiblescouring of the concave embankment foot and river bed. The technical line and research methods applied in this paper can be extended to statisfy the engineering design optimization for overburden layer of similar tunnel engineering.
Study on River Health Assessment Method of the Urbanized Area in Eastern Plain of China
Authors: Ding Yifan , Ji Yongxing , Liu Xiaomei , Wu Jinlong 
Published: May 2020

Abstract
River health assessment is an important decision-making basis of ecological protection and watershed management. In this study, we established the river health evaluation method of the urbanized area in eastern plain of China. In recent years, Shanghai city has carried out many comprehensive river rehabilitation and ecological restoration projects. Two small rivers with different health condition background were taken as examples to reveal the river health status before and after their rectification. The assessment result shows that the health status of river Arestored from Sick (RHI=0.074) to Sub-healthy (RHI=0.510), and river B from Sub-healthy (RHI=0.585) to Ideal (RHI=0.956). This conclusion is consistent with the actual situation, and the evaluation results are reasonable.
Unidirectional Heat Transfer into a Rotating Cylinder Containing R-134a Refrigerant
Authors: Park David , Kim Sunwoo 
Published: May 2020

Abstract
An analysis was conducted on the feasibility of designing a unidirectional heat transfer cylindrical wall suitable for microgravity conditions. The heat transfer wall is unidirectional in the sense that heat is only allowed to flow in one direction, which is made possible by the principles of phase-change heat transfer (PCHT). The wall is to consist of two concentric cylindrical walls and is to direct heat from the outer wall to the inner wall radially. A mathematical model is presented for the proposed unidirectional heat transfer wall. Preexisting heat transfer correlations were utilized to calculate the heat transfer rate of the unidirectional heat transfer wall with R-134a as the working fluid. The present study demonstrates that the unidirectional heat transfer wall can switch from a heat conductor to a thermal insulator by adjusting the loading of the working fluid within the walls of the proposed device.
The Study on Chitosan Coating on Poly(Lactic Acid) Film Packaging to Extend Vegetable and Fruit Life
Authors: Kumbunleu J , Rattanapun A , Sapsrithong P , Tuampoemsab S , Sritapunya T 
Published: May 2020

Abstract
The objective of this work is the study of possibility of extending the life of vegetables and fruits packed with polylactic acid (PLA) film coated with squid chitosan with various contents (0, 1, 3 and 5 phr), acted as an antimicrobial agent and the study of mechanical properties of these films. In the first step, PLA was compounded with 20 percents of glycerol by using a two-roll mill. After that, all compounds were fabricated by blown film extrusion. In next step, the chitosan solutions were prepared in 1 wt% hydrochloric acid solution to coat on one side of PLA film. The last step, the prepared films were examined tensile properties and storage time of 4 types of vegetables and fruits including broccolis, Leb Mue Nang bananas, red grapes and queen tomatoes by packing. The results showed that the tensile strength of PLA films coated with chitosan was closed to that of neat PLA/glycerol film. For spoilage test, it was found that all vegetables and fruits were more shriveled and wilted with more chitosan content through respiration process due to the leakage of chotisan coated PLA film and weight loss of vegetables and fruits., especially for PLA film coated with 5 phr chitosan since more remained acetic acid solvent accelerated more hydrolysis rate of PLA film.
Traffic Safety Benefits of Using Highway Lighting Technology: (Case Study: 4-Lanes Expressways in the Rural Areas)
Authors: Abuzwidah Muamer , Balwan Mohsin , Abdel-Aty Mohamed , Al-Kateeb Ghazi 
Published: May 2020

Abstract
Highway Lighting (HL) is designed and implemented on the transportation system for expected societal, safety and security reasons. The use of Technologies such as LED lighting and the solar power can encourage many transportation agencies to implement the Highway Lighting on their roads, especially on the rural roads where there are difficulties to connect the power, also it known that the typical Highway Lighting is need a lot of energy. The main goal of this paper is to evaluate the safety effectiveness of the implementation of highway lighting on the Night-Time Crashes on 4-Lanes expressways in the rural areas. An advanced Cross-Sectional method was used to evaluate the effect of adding highway lighting on the safety performance of expressways as a major part of the transportation system. The data was carefully selected and only expressways with 4-lanes were chosen because there were enough treated and reference segments for them. In the Cross-sectional models, a total number of 22 treated segments and 155 untreated segment located on the 4-lanes expressways in Florida State were used. The results showed that adding HL has a positive effect on Crash reduction for the night-time Crashes (all crash types and all severity levels) by an approximately 30 percent. The night-time fatal and serious injury crashes were reduced by 27 percent while the Non-Injury crashes were reduced by 21 percent. Overall, implementing HL technologies is highly encouraged especially on the rural roads to improve safety and security. The Crash Modification Factors developed would help transportation officials to benefit from the extensive research in adding highway lighting to the road network, especially on expressways by providing quantitative information on crash analysis and evaluation for decision making in planning, design, operation, and maintenance.
Chemical Quality of Fresh New Zealand White Rabbit Meat in Batu, Indonesia
Authors: Fadlilah A , Rosyidi D , Susilo A 
Published: May 2020

Abstract
Batu was one of the cities in the province of East Java, Indonesia that one of the leading tourist cities in Indonesia. Rabbit satay was one of the Batu city famous foods. Many tourists visited Batu City for consume it. Rabbits were obtained from rabbit breeders in the Batu city. The environment and the pattern of rearing rabbits had an impact on the quality of the meat and specific characteristic of the meat production. This study aimed to determine the chemical quality of the fresh New Zealand White (NZW) rabbit meat in the Batu City using the proximate analysis. This Research used 9 males of NZW rabbits, each of them was taken 100gr of loin flesh for proximate analysis. Rabbits were kept intensively. The results showed that fresh NZW Rabbit Meat had a carbohydrate content was 0.43%, Protein content was 19.99%, Moisture was 75.84%, Ash content was 1.43% and Energy gross was 110.47 Kcal/100g.
Evaluation of Chemical Composition and Lipid Components in Maize Straw based Complete Feed Diets Supplemented by Conden Tannin and Myristic Acid
Authors: Muchlas M , Chuzaemi S , Mashudi  
Published: May 2020

Abstract
Although maize straw as an agricultural by products could be used as an alternative feed ingredient for ruminants, its low nutritional value and palatability require an early processing. Supplementation of feed additive that functions as a methane inhibitor. The study was to examine the chemical composition in maize straw based complete feed diets supplemented by conden tannin and myristic acid. The experimental method used a group-randomized trials by ANOVA with 4 dietary treatments and 3 replications. The treatments are T1: Maize Straw Based Complete Rations (Control Diet), T2: Control diet +Mimosa powder (MP) 1,5%/kgDM + Myristic acid (MA)2%/kgDM, T3: Control diet + MP 1,5%/kg DM + MA 3%/kg DM, and T4: Control diet + MP 1,5%/kg DM + MA 4%/kg DM. Proximate and van soest analysis was analysed in the Feed and Nutrition Laboratory, animal Science faculty, Brawijaya University, Malang. The result showed that the maize straw complete feed without supplemented has not different with a chemical compositions Maize straw with 3 level of Conden tannin and myristic acid supplementation. Besides higher EE components contained on T4 which supplemented by CT 1,5 %/kg DM and MA 40 g/kg DM. It can be concluded that CT and MA in Maize Straw based complete feed diets can be used as rumen modifier without effected on chemical component.