Journal of Civil Engineering and Construction最新文献_第8页

Development of Small-scale Two-stage Photovoltaic-photothermal Humidification-dehumidification Desalination System 小型两级光伏-光热加湿-除湿海水淡化系统的研制

Journal of Civil Engineering and Construction Pub Date : 2018-05-30 DOI: 10.32732/JCEC.2018.7.2.90

Junquan Zhang, Ke Yang, Changsheng Peng

{"title":"Development of Small-scale Two-stage Photovoltaic-photothermal Humidification-dehumidification Desalination System","authors":"Junquan Zhang, Ke Yang, Changsheng Peng","doi":"10.32732/JCEC.2018.7.2.90","DOIUrl":"https://doi.org/10.32732/JCEC.2018.7.2.90","url":null,"abstract":"Air bubble has been proved that it can increase evaporation area and coefficient of mass transfer and heat transfer. Two-stage evaporation system can indirectly increase the contact area of water and vapor, reduce the volume of single evaporation system, and can also combine the multiple systems flexibly. So a new type of small scale two-stage photovoltaic-photothermal humidification-dehumidification (HDH) desalination system is designed, and the relationship between solar radiation and temperature is measured, and the water production capability of the system is investigated. The effect of water temperature, ambient temperature, air flow rate and air temperature on desalination performance is also investigated. The results showed that the rate of water production is positively correlated with sea water temperature, ambient temperature, gas flow rate and air temperature. And the gas temperature is positively correlated with the solar radiation intensity. When the ambient temperature is higher than 25 ℃, the cumulative amount of irradiation is 22.3 MJ/m2, the cumulative water production is 19.2 L/d, and 6.4 L/( m2∙d), the thermal efficiency is 0.66. The cost of water produced through the designed HDH system is 0.08 $/L.","PeriodicalId":243788,"journal":{"name":"Journal of Civil Engineering and Construction","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122775649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

State-dependent Dilatancy Theory and Numerical Modelling of Rockfills 堆石体状态相关剪胀理论与数值模拟

Journal of Civil Engineering and Construction Pub Date : 2018-05-30 DOI: 10.32732/JCEC.2018.7.2.100

Xiao-mei Li, Lin Han, Y. Guan

引用次数: 2

Effects of marble, timber, and glass powder as partial replacements for cement 大理石、木材和玻璃粉部分替代水泥的效果

Journal of Civil Engineering and Construction Pub Date : 2018-05-30 DOI: 10.32732/JCEC.2018.7.2.63

Bassam A. Tayeh

引用次数: 56

Comparison of Russian, Chinese and European seismic design on pseudo-static seismic coefficient in slope analysis 俄罗斯、中国和欧洲在边坡分析中拟静力地震系数设计的比较

Journal of Civil Engineering and Construction Pub Date : 2018-05-30 DOI: 10.32732/jcec.2018.7.2.57

K. Kang, O. Zerkal, J. Liu, S. Huang, D. Tao

引用次数: 1

Study on the Variation of Annual Runoff and Influencing Factors in Kuye River during the Past 60 Years 库掖河近60年年径流量变化及影响因素研究

Journal of Civil Engineering and Construction Pub Date : 2018-05-30 DOI: 10.32732/JCEC.2018.7.2.72

Zhihua Ma, Qiaoling Guo, Ning Su

{"title":"Study on the Variation of Annual Runoff and Influencing Factors in Kuye River during the Past 60 Years","authors":"Zhihua Ma, Qiaoling Guo, Ning Su","doi":"10.32732/JCEC.2018.7.2.72","DOIUrl":"https://doi.org/10.32732/JCEC.2018.7.2.72","url":null,"abstract":"In this study, observed runoff series from a hydro-station respectively named Wenjiachuan station in the Kuye river was manipulated for monthly annual variation analysis assisted by using nonuniformity coefficient and concentration degree(period).the cumulative filter methods was employed to detect the trend of inner-annual runoff. Based on meteorological and hydrological data of the Wenjiachuan hydrologic station from 1955 to 2015, the paper studied the variation tendency, the abrupt and periodic changes of annual runoff using the Mann-Kendall non-parametric test and accumulation anomaly curve. Double mass curve was used to estimate the impact of human activities and climate change on the runoff variation. The curve of seasonal runoff distribution for Wenjiachuan station appeared two peak patterns. The annual runoff declined markedly, the effect of climate on runoff decreased, the influence of human activities on runoff gradually increased the human activities are the primary factors leading to the reduction of annual runoff. In human activities, large-scale water and soil conservation measures and high-strength coal mining have produced significant effects on the annual runoff reduction in Kuye River.","PeriodicalId":243788,"journal":{"name":"Journal of Civil Engineering and Construction","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124353304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

The Relationship between Surface Water Quality and Watershed Characteristics 地表水水质与流域特征的关系

Journal of Civil Engineering and Construction Pub Date : 2018-02-27 DOI: 10.32732/JCEC.2019.8.3.107

Amir Mohammadi, M. Vafakhah, M. Javadi

{"title":"The Relationship between Surface Water Quality and Watershed Characteristics","authors":"Amir Mohammadi, M. Vafakhah, M. Javadi","doi":"10.32732/JCEC.2019.8.3.107","DOIUrl":"https://doi.org/10.32732/JCEC.2019.8.3.107","url":null,"abstract":"The healthy water resources are necessary and essential prerequisite for environmental protection and economic development, political, social and cultural rights of Iran. In this research, water quality parameters i.e. total dissolved solids (TDS), sodium absorption rate (SAR), electrical conductivity (EC), Na+, Cl-, CO32-, K+, Mg2+, Ca2+, pH, HCO3- and SO42- during 2010-2011 were obtained from Iranian Water Resources Research Institute in water quality measurement stations on Mazandaran province, Iran. Then, the most important catchment characteristics (area, mean slope, mean height, base flow index, annual rainfall, land cover, and geology) were determined on water quality parameters using stepwise regression via backwards method in the 63 selected rivers. The results showed that sodium absorption rate (SAR), total dissolved solids (TDS), electrical conductivity (EC), Na+ and Cl- parameters are strongly linked to geology characteristics, while K+, Mg2+ and Ca2+ cations is linked to rainfall and geology characteristics. pH and HCO3- are related to area, rainfall, land cover and geology characteristics, CO32- is related to area, rainfall, rangeland area and geology characteristics and SO42- is related to area, rainfall, range and bar land area and geology characteristics. Adaptive Neuro-Fuzzy Inference System (ANFIS) was used for modeling the selected catchment characteristics and water quality parameters. The ANFIS models have a high Nash–Sutcliffe model efficiency coefficient (NSE) and low root mean squares error (RMSE) to estimate water quality parameters.","PeriodicalId":243788,"journal":{"name":"Journal of Civil Engineering and Construction","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123255963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Safety Performance in Industrial Construction: A Case Study 工业建筑的安全绩效:个案研究

Journal of Civil Engineering and Construction Pub Date : 1900-01-01 DOI: 10.32732/jcec.2021.10.4.237

A. Senouci, Ali Jedinia, N. Eldin

引用次数: 0

Interaction Diagram of Rubberised Concrete Filled Square Hollow Sections 方形空心截面橡胶混凝土相互作用图

Journal of Civil Engineering and Construction Pub Date : 1900-01-01 DOI: 10.32732/jcec.2019.8.2.55

M. Elchalakani, M. Dong, A. Karrech

{"title":"Interaction Diagram of Rubberised Concrete Filled Square Hollow Sections","authors":"M. Elchalakani, M. Dong, A. Karrech","doi":"10.32732/jcec.2019.8.2.55","DOIUrl":"https://doi.org/10.32732/jcec.2019.8.2.55","url":null,"abstract":"Rubberised concrete utilises waste material, prevents resource extraction and improves concrete ductility, however at the cost of reduced strength and stiffness. The performance of thirty rubberised concrete-filled single-skin steel tubes under combined loading conditions were systematically investigated and comparisons against six steel hollow tubular columns and beams were made. The experimental program consisted of three rubber replacement ratios, 0%, 15% and 30%, three load eccentricities and four tube sections with section slenderness (b/t, width/thickness) of 18 to 50. The results showed that the confined rubberised concrete and the restrained steel tube improved strength and ductility of the composite section. The rubberised concrete was more effective in delaying the premature buckling failure of the steel tube compared to the more brittle normal concrete. The rubberised concrete with 15% rubber replacement ratio showed a good balance of strength and ductility. The interaction diagrams obtained from the experiments and theoretical calculations were constructed and compared. The behaviours of the rubberised concrete filled steel tubes could be accurately predicted using existing design guidelines and safe designs can be produced. This study demonstrated the possibility of using rubberised concrete as a cost-effective solution to problems that require high moment and deformation capacity, such as the roadside barriers and columns in buildings located in seismic active zones.","PeriodicalId":243788,"journal":{"name":"Journal of Civil Engineering and Construction","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130810531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Concentration of Bid Prices Just Above the Standard Minimum Price in Public Construction Works 公共建设工程中略高于最低标的价的集中投标

Journal of Civil Engineering and Construction Pub Date : 1900-01-01 DOI: 10.32732/jcec.2021.10.3.177

Satoru Yamaki, N. Yabuki

引用次数: 0

Anti-adherent Molds Yield Hydraulic Concrete Samples Suitable for Assessments of Surface and Water Absorption 抗黏附模具产生适合评估表面和吸水的水工混凝土样品

Journal of Civil Engineering and Construction Pub Date : 1900-01-01 DOI: 10.32732/jcec.2021.10.4.245

Ernesto Mora, E. Castellón

{"title":"Anti-adherent Molds Yield Hydraulic Concrete Samples Suitable for Assessments of Surface and Water Absorption","authors":"Ernesto Mora, E. Castellón","doi":"10.32732/jcec.2021.10.4.245","DOIUrl":"https://doi.org/10.32732/jcec.2021.10.4.245","url":null,"abstract":"To assess several quality parameters of hydraulic concrete, cubic samples of this material are commonly assembled in engineering laboratories using molds. It is ubiquitous the use of cubic metallic molds of volume 125 cm3; these molds require the application of demolding substances (such as oils) on their surfaces to avoid the adhesion of the final hardened concrete sample to the molds. Despite this common practice suitable for evaluating mechanical traits of the materials, the use of a demolding agent spoils the concrete samples for the assessment of surface and water absorption parameters. To overcome this difficulty, we propose a new anti-adherent cubic mold that requires no demolding agent. The construction of the new mold based on anti-adherent polytetrafluoroethene (PTFE, Teflon®) is described with its use. To assess the claimed advantages of the new anti-adherent molds in testing surface and water diffusion traits of concrete samples, experiments on water contact angles, rates of water absorption and drying were performed on concrete specimens obtained with the classic and the new PTFE molds. It was proved the advantage of the anti-adherent mold over common metallic molds. The use of an oil as demolding agent in the concrete samples assembled in metallic molds produced conspicuous differences of water contact angles and absorption in comparison to clean concrete samples produced with PTFE molds.","PeriodicalId":243788,"journal":{"name":"Journal of Civil Engineering and Construction","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130437427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0