工程设计学报 Pub Date : 2016-03-03 DOI: 10.1155/2016/1317489

Yawei Yu, Jian-hua Zhang, M. Shafi, Min Zhang, J. Mirza

{"title":"Statistical Characteristics of Measured 3-Dimensional MIMO Channel for Outdoor-to-Indoor Scenario in China and New Zealand","authors":"Yawei Yu, Jian-hua Zhang, M. Shafi, Min Zhang, J. Mirza","doi":"10.1155/2016/1317489","DOIUrl":"https://doi.org/10.1155/2016/1317489","url":null,"abstract":"The 3-dimensional (3D) channel model gives a better understanding of statistical characteristics for practical channels than the 2-dimensional (2D) channel model, by taking the elevation domain into consideration. As different organizations and researchers have agreed to a standard 3D channel model, we attempt to measure the 3D channel and determine the parameters of the standard model. In this paper, we present the statistical propagation results of the 3D multiple-input and multiple-output (MIMO) channel measurement campaign performed in China and New Zealand (NZ). The measurements are done for an outdoor-to-indoor (O2I) urban scenario. The dense indoor terminals at different floors in a building form a typical 3D propagation environment. The key parameters of the channel are estimated from the measured channel impulse response (CIR) using the spatial-alternating generalized expectation-maximization (SAGE) algorithm. Till now there is abundant research performed on the azimuth domain; this paper mainly considers the statistical characteristics of the elevation domain. A statistical analysis of 3D MIMO channel results for both China and NZ measurements is presented for the following parameters: power delay profile (PDP), root mean square (rms), delay spread (DS), elevation angle-of-arrival (EAoA) distribution, elevation angle-of-departure (EAoD) distribution, elevation angular spread (AS), and cross-polarization discrimination (XPD).","PeriodicalId":31263,"journal":{"name":"工程设计学报","volume":"22 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2016-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80323659","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: 8

Modeling and Experiments of Severe Slugging in a Riser System 立管系统严重段塞流建模与实验

工程设计学报 Pub Date : 2016-02-29 DOI: 10.1155/2016/4586853

Wang Lin, Yuxing Li, Liu Chang, Q. Hu, Yating Wang, Wang Quan

{"title":"Modeling and Experiments of Severe Slugging in a Riser System","authors":"Wang Lin, Yuxing Li, Liu Chang, Q. Hu, Yating Wang, Wang Quan","doi":"10.1155/2016/4586853","DOIUrl":"https://doi.org/10.1155/2016/4586853","url":null,"abstract":"A transient mathematical model based on continuity equations for liquid and gas phases, with a momentum equation for the mixture, was developed, and numerical solutions and simulations corresponding to severe slugging in pipeline-riser system were presented, and the results were compared with the experimental data to verify the mathematical model. In numerical solutions, backward Euler schemes were adopted as predictors and trapezoidal methods were used as correctors. Variable time steps were employed for higher computational efficiency and accuracy in the integration. Experiments of severe slugging characteristics were performed, and the simulation results of the cycle periods and bottom pressure were compared with experimental values. Finally, the calculation results of detailed characteristics were analyzed thoroughly. The results show that the developed mathematical model can accurately predict the cycle time and the detailed characteristics of severe slugging. Under the experimental conditions, the liquid slug length can reach 1.6 times the height of the riser, and the maximum instantaneous gas velocity of outlet is 50 times the inlet gas velocity, and the maximum instantaneous liquid velocity of outlet is 28 times the inlet liquid velocity, having important implications for the hazard assessment of severe slugging.","PeriodicalId":31263,"journal":{"name":"工程设计学报","volume":"23 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2016-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89173087","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

Combinatorial Bayesian Dynamic Linear Models of Bridge Monitored Data and Reliability Prediction 桥梁监测数据的组合贝叶斯动态线性模型及可靠性预测

工程设计学报 Pub Date : 2016-02-15 DOI: 10.1155/2016/3648126

Xueping Fan, Yuefei Liu

引用次数: 4

Discrete element method study on the percolation process of fine particles in ore drawing by the block caving method 块状崩落法放矿细颗粒渗流过程的离散元法研究

工程设计学报 Pub Date : 2016-01-01 DOI: 10.13374/J.ISSN2095-9389.2016.11.001

Feng Yuntian

引用次数: 1

Influence of Cr3C2 content on the wear properties of Cr3C2/Ni3Al composites Cr3C2含量对Cr3C2/Ni3Al复合材料磨损性能的影响

工程设计学报 Pub Date : 2016-01-01 DOI: 10.13374/J.ISSN2095-9389.2016.08.014

L. Fu, W. Han, Yanzhao Xie, Chang-hai Li, C. Dong, Lin Zhao, Z. Tian

引用次数: 1

Effects of preparing conditions on the electro-optical properties of reverse-mode polymer-stabilized cholesteric texture films 制备条件对反模聚合物稳定胆甾质织构膜电光性能的影响

工程设计学报 Pub Date : 2015-01-01 DOI: 10.13374/J.ISSN.2095-9389.2015.06.013

H. Cao, Yunjie Yin, Ling Xiao, Dong Wang, Zhou Yang

引用次数: 0

Deoxidization effect research of a new Al based complex deoxidizer 一种新型铝基复合脱氧剂的脱氧效果研究

工程设计学报 Pub Date : 2015-01-01 DOI: 10.13374/J.ISSN2095-9389.2015.05.005

Tang Wang, B. Song, Ming-ming Song, Maolong Chen, J. Mao

引用次数: 0

Numerical Evaluations of Functionally Graded RC Slabs 功能分级RC板的数值评价

工程设计学报 Pub Date : 2014-09-10 DOI: 10.1155/2014/768956

M. Mastali, Z. Abdollahnejad, M. G. Naghibdehi, M. Sharbatdar

{"title":"Numerical Evaluations of Functionally Graded RC Slabs","authors":"M. Mastali, Z. Abdollahnejad, M. G. Naghibdehi, M. Sharbatdar","doi":"10.1155/2014/768956","DOIUrl":"https://doi.org/10.1155/2014/768956","url":null,"abstract":"Nowadays, using fibrous materials is used widely in strengthening applications such as cross-section enlargement and using functionally graded reinforced concrete. Functionally graded reinforced concrete is used as multireinforced concrete layers that can be reinforced by different fiber types. The objective of this research was to address the structural benefits of functionally graded concrete materials by performing analytical simulations. In order to achieve this purpose, in the first stage of this study, three functionally graded reinforced concretes by steel and polypropylene (PP) were experimentally tested under flexural loading. Inverse analysis was applied to obtain the used material properties of reinforced concrete by FEMIX software. After obtaining the material properties, to assess the performance of proposed slabs, some other cases were proposed and numerically evaluated under flexural and shear loading. The results showed that increasing steel fiber in reinforced entire cross section led to achieve better shear and flexural performance while the best performance of reinforced functionally graded slabs was achieved for slab at 1% fiber content. In the second stage, nineteen reinforced functionally graded RC slabs with steel bars were simulated and assessed and some other cases were considered which were not experimentally tested.","PeriodicalId":31263,"journal":{"name":"工程设计学报","volume":"29 1","pages":"1-20"},"PeriodicalIF":0.0,"publicationDate":"2014-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84377315","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: 8

A New Mathematical Inventory Model with Stochastic and Fuzzy Deterioration Rate under Inflation 通货膨胀下具有随机模糊劣化率的库存数学模型

工程设计学报 Pub Date : 2014-08-14 DOI: 10.1155/2014/347857

Bahar Naserabadi, A. Mirzazadeh, S. Nodoust

{"title":"A New Mathematical Inventory Model with Stochastic and Fuzzy Deterioration Rate under Inflation","authors":"Bahar Naserabadi, A. Mirzazadeh, S. Nodoust","doi":"10.1155/2014/347857","DOIUrl":"https://doi.org/10.1155/2014/347857","url":null,"abstract":"This paper develops an inventory model for items with uncertain deterioration rate, time-dependent demand rate with nonincreasing function, and allowable shortage under fuzzy inflationary situation. The goods are not deteriorating upon reception, but the deteriorating starts after elapsing a specified time. The lead time and inflation rate are both uncertain in the model. The resultant effect of inflation and time value of money is assumed to be fuzzy in nature and also we consider lead time as a fuzzy function of order quantity. Furthermore the following different deterioration rates have been considered: for the first case we consider fuzzy deterioration rate and for the second case we assume that the deterioration rate is time dependent and follows Weibull distribution with three known parameters. Since the inflation rate, deterioration rate, and the lead time are fuzzy numbers, the objective function becomes fuzzy. Therefore the estimate of total costs for each case is derived using signed distance technique for defuzzification. The optimal replenishment policy for the model is to minimize the total present value of inventory system costs, derived for both the above mentioned policies. Numerical examples are then presented to illustrate how the proposed model is applied.","PeriodicalId":31263,"journal":{"name":"工程设计学报","volume":"68 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2014-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79170166","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: 7

The Design of an Urban Roadside Automatic Sprinkling System: Mitigation of PM2.5–10 in Ambient Air in Megacities 城市路边自动洒水系统的设计:缓解特大城市环境空气中的PM2.5-10

工程设计学报 Pub Date : 2014-07-23 DOI: 10.1155/2014/618109

Shiyong Liu, K. Triantis, Lan Zhang

{"title":"The Design of an Urban Roadside Automatic Sprinkling System: Mitigation of PM2.5–10 in Ambient Air in Megacities","authors":"Shiyong Liu, K. Triantis, Lan Zhang","doi":"10.1155/2014/618109","DOIUrl":"https://doi.org/10.1155/2014/618109","url":null,"abstract":"The objective of this research paper is to describe the system architecture for an urban roadside automatic mist-generating system. Its primary purpose is to mitigate particulate matter especially PM2.5–10. In this paper, four graphs are provided to exhibit the constituent elements of this system. This paper also discusses the functional extensions of this system for alternative uses in civil engineering which include winter road deicing and desnowing with added salt; clean-up of street dust; lowering of temperature of a “hot island” during the summer; the addition of humidity in an arid area; and the suppression of flu virus in the winter season. The structure and function of this system are comprehensively discussed in this paper. This system is compared to existing and other proposed systems in terms of control options, efficiency, and primary functional issues. The unique design of the road automatic sprinkling system renders itself a prominent option. Although there are no data available for this conceptual system, some expected qualitative and quantitative outcomes are provided and justified. The paper concludes with some potential research areas and challenges associated with this system architecture.","PeriodicalId":31263,"journal":{"name":"工程设计学报","volume":"11 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2014-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78677676","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: 10

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