International journal of engineering. Transactions A: basics最新文献_第4页

Effect of Different Welding Parameters on the Mechanical and Microstructural Properties of Stainless Steel 304H Welded Joints 不同焊接参数对304H不锈钢焊接接头力学和显微组织性能的影响

International journal of engineering. Transactions A: basics Pub Date : 2017-07-07 DOI: 10.5829/ije.2017.30.10a.21

S. Rizvi, S. Tewari

{"title":"Effect of Different Welding Parameters on the Mechanical and Microstructural Properties of Stainless Steel 304H Welded Joints","authors":"S. Rizvi, S. Tewari","doi":"10.5829/ije.2017.30.10a.21","DOIUrl":"https://doi.org/10.5829/ije.2017.30.10a.21","url":null,"abstract":"In this research work, an attempt has been made to examine the different welding parameters which affect the weldability of 304H Austenitic stainless steel (ASS) welded joint using the proper filler wire. Chemical composition of filler wire was same as that of base metal. Further this study addressed the combined effect of various welding parameters on the metallurgical and mechanical properties of the weldments. Welding was carried out at different parameters such as welding wire speed, shielding gas flow rate, welding current and arc voltage etc. Tensile tests and V-notch Charpy tests were conducted as per ASTM to determine the mechanical properties of the welded specimens. In order to determine the microstructured changes that occurred, the interface regions of the welded specimens were examined by microscope. As a result, it is reported that changing the shielding gas flow rate and wire feed speed affects the microstructure and mechanical properties of weldment. Impact tests reveal that toughness of the welded joint increases with increasing in welding current, while ultimate tensile strength (UTS) first increases and then decreases.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133921768","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

The Effect of Caspian Sea Water on Corrosion Resistance and Compressive Strength of Reinforced Concrete Containing Different SiO2 Pozzolan 里海海水对含不同SiO2硅酸盐的钢筋混凝土耐蚀性和抗压强度的影响

International journal of engineering. Transactions A: basics Pub Date : 2017-07-07 DOI: 10.5829/ije.2017.30.10a.06

S. B. Kutenayi, Seyed Rahim Kiahosseini, M. Talebpour

{"title":"The Effect of Caspian Sea Water on Corrosion Resistance and Compressive Strength of Reinforced Concrete Containing Different SiO2 Pozzolan","authors":"S. B. Kutenayi, Seyed Rahim Kiahosseini, M. Talebpour","doi":"10.5829/ije.2017.30.10a.06","DOIUrl":"https://doi.org/10.5829/ije.2017.30.10a.06","url":null,"abstract":"Many parameters are influenced by the diffusion of chloride on concrete in marine environments and these can affect concrete quality. In this study, the effect of water to cement ratio of 0.35, 0.40 and 0.45 on corrosion resistance and compressive strength of reinforced concrete was evaluated. Moreover, different percentages of micro silica (SiO2) including 5, 7.5 and 10% were utilized, in order to investigate the effect of pozzolanic materials on the corrosion of steel in concrete. Then cubic samples reinforced with steel bar spacing of 2.5, 5 and 7 cm from the cube surface were made and put in Caspian sea water for 5 months. During this period, corrosion potential of steel was measured by a calomel half cell (SCE). In order to finalize the evaluation of the mechanical strength of the samples, concrete pressure test was conducted and the result showed that after 40, 44 and 59 days for the bars with depth of 2.5, 5 and 7 cm, respectively and the samples prepared with water-cement ratio of 0.35, the corrosion potential was -350V versus SCE, while the compressive strength was approximately 450 kg/cm2. This result showed longer life span of this sample in comparison with other water-cement ratios. By adding micro silica to the samples up to 7.5%, the time for obtaining a corrosion potential of -350V, bars with depth of 2.5, 5 and 7 cm, was 43, 50 and 86 days, respectively, and the compressive strength of this sample was approximately 480 kg/cm2. Consequently, it is arguable that in order to achieve longer life span of corrosion and suitable compressive strength, the optimum ratio of water to cement should be 0.35 and the percentage of pozzolan SiO2 should be 7.5%.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123874989","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: 6

Soft Soil Seismic Design Spectra Including Soil-structure Interaction 包括土-结构相互作用的软土抗震设计谱

International journal of engineering. Transactions A: basics Pub Date : 2017-07-07 DOI: 10.5829/idosi.ije.2017.30.09c.04

F. Behnamfar, A. Fathollahi

{"title":"Soft Soil Seismic Design Spectra Including Soil-structure Interaction","authors":"F. Behnamfar, A. Fathollahi","doi":"10.5829/idosi.ije.2017.30.09c.04","DOIUrl":"https://doi.org/10.5829/idosi.ije.2017.30.09c.04","url":null,"abstract":"Design spectrum is known as an essential tool in earthquake engineering for calculation of maximum (design) responses in a structural system. Soil-structure interaction (SSI), as a phenomenon of coupling of responses of a structure and its underlying soil, was explored after introduction of design spectra and has not been taken into account in developing a design spectrum traditionally. To consider the SSI automatically when doing a spectrum analysis, in this paper maximum response of a single degree of freedom system resting on a flexible base is determined under consistent earthquakes. Consistency of earthquakes is maintained by considering their magnitude, distance, local soil type, and return period. The latter parameter is accounted by the use of earthquake categories identified by their similar spectral values at short periods. Different types of soils and two categories of earthquakes regarding their distance, being near field and far field, are considered. The results are presented as smoothed design spectra. It is shown that SSI alters the response acceleration of buildings having up to about 10 stories and is ineffective for the rest. It has an increasing effect for the response acceleration of buildings up to about 5 stories.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"259 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122463185","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

Effect of Blade Design Parameters on Air Flow through an Axial Fan 叶片设计参数对轴流风机气流的影响

International journal of engineering. Transactions A: basics Pub Date : 2017-07-07 DOI: 10.5829/ije.2017.30.10a.20

N. Rajabi, R. Rafee, S. Frazam-Alipour

{"title":"Effect of Blade Design Parameters on Air Flow through an Axial Fan","authors":"N. Rajabi, R. Rafee, S. Frazam-Alipour","doi":"10.5829/ije.2017.30.10a.20","DOIUrl":"https://doi.org/10.5829/ije.2017.30.10a.20","url":null,"abstract":"The objective of this paper is the numerical study of the flow through an axial fan and examining the effects of blade design parameters on the performance of the fan. The axial fan is extensively used for cooling of the electronic devices and servers. Simulation of the three-dimensional incompressible turbulent flow was conducted by numerical solution of the (RANS) equations for a model. The SST- k-ω and k-e turbulence models are applied in the simulations which are done using CFX software. The comparison between available experimental data and simulation results indicates that the SST k-ω model gives more accurate results than the k-e model. The results also show that in separation regions and vortices, the pressure will decrease. Hub area and blade root contain large vortices. The effects of changes in the blade geometry and the number of blades on the fan performance are studied in detail. For the primary fan model with the different number of blades (4, 5, and 6), the maximum mass flow rate of 800 CFM is obtained. Hence, the number of blades had negligible effects on the maximum flow rate. By 3o% decreasing in the chord of the blades, the maximum mass flow rate of the fan with the different number of blades (5, 6 and 8) will be reduced to 500 CFM. Therefore, in order to increase the maximum mass flow rate, the chord and the width of blades should be increased. On the other hand, by increasing blades from 4 to 6 in the primary model, the maximum outlet pressure has been increased by 32%. Furthermore, it was found that in high flow rates, an increment in the number of blades had no effect on the produced static pressure.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131497504","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

A Bi-objective Stochastic Optimization Model for Humanitarian Relief Chain by Using Evolutionary Algorithms 基于进化算法的人道主义救援链双目标随机优化模型

International journal of engineering. Transactions A: basics Pub Date : 2017-07-07 DOI: 10.5829/ije.2017.30.10a.14

N. Javadian, S. Modarres, A. Bozorgi

{"title":"A Bi-objective Stochastic Optimization Model for Humanitarian Relief Chain by Using Evolutionary Algorithms","authors":"N. Javadian, S. Modarres, A. Bozorgi","doi":"10.5829/ije.2017.30.10a.14","DOIUrl":"https://doi.org/10.5829/ije.2017.30.10a.14","url":null,"abstract":"Due to the increasing amount of natural disasters such as earthquakes and floods and unnatural disasters such as war and terrorist attacks, Humanitarian Relief Chain (HRC) is taken into consideration of most countries. Besides, this paper aims to contribute humanitarian relief chains under uncertainty. In this paper, we address a humanitarian logistics network design problem including local distribution centers (LDCs) and multiple central warehouses (CWs) and develop a scenario-based stochastic programming (SBSP) approach. Also, the uncertainty associated with demand and supply information as well as the availability of the transportation network's routes level after an earthquake are considered by employing stochastic optimization. While the proposed model attempts to minimize the total costs of the relief chain, it implicitly minimize the maximum travel time between each pair of facility and the demand point of the items. Additionally, a data set derived from a real disaster case study in the Iran area, and to solve the proposed model a exact method called ɛ-constraint in low dimension along with some well-known evolutionary algorithms are applied. Also, to achieve good performance, the parameters of these algorithms are tuned by using Taguchi method. In addition, the proposed algorithms are compared via four multi-objective metrics and statistically method. Based on the results, it was shown that: NSGA-II shows better performances in terms of SNS and CPU time, meanwhile, for NPS and MID, MRGA has better performances. Finally, some comments for future researches are suggested.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132190935","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: 15

An Architecture for Security and Protection of Big Data 大数据安全与保护体系结构

International journal of engineering. Transactions A: basics Pub Date : 2017-07-07 DOI: 10.5829/ije.2017.30.10a.08

F. A. S. Abad, H. Hamidi

{"title":"An Architecture for Security and Protection of Big Data","authors":"F. A. S. Abad, H. Hamidi","doi":"10.5829/ije.2017.30.10a.08","DOIUrl":"https://doi.org/10.5829/ije.2017.30.10a.08","url":null,"abstract":"The issue of online privacy and security is a challenging subject, as it concerns the privacy of data that are increasingly more accessible via the internet. In other words, people who intend to access the private information of other users can do so more efficiently over the internet. This study is an attempt to address the privacy issue of distributed big data in the context of cloud computing. One of the cases where data privacy is of great importance is the authentication and protection of ownership data. In this paper, this privacy issue is analyzed by Petri net modeling. What today’s organizations need for their clouds are integrated comprehensive solutions that can deliver security intelligence. Advanced security intelligence solutions can close security gaps by using labor-saving automation to analyze millions of events occurring within the cloud, and discover system vulnerabilities through the normalization and correlation of these events. Using the proposed method, a model of security, including control of user access to databases of big data with RMS, the multiplicity and the virtual machine to prevent internal threats, deleting data, insecure or incomplete data protection and control of a third-party can be provided to improve the operation according to the rules of Petri net modeling and simulation.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127906608","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

Population Balance Equation Modeling of Crude Oil Demulsification Considering Demulsifier: Modification of Collision Frequency Function Based on Thermodynamic Model 考虑破乳剂的原油破乳种群平衡方程建模:基于热力学模型的碰撞频率函数修正

International journal of engineering. Transactions A: basics Pub Date : 2017-07-07 DOI: 10.5829/ije.2017.30.10a.03

N. Roshan, S. Ghader, M. Rahimpour

引用次数: 2

Investigation of the Heat Treatment Effect on Microstructures and Phases of Inconel 713C Superalloy 热处理对Inconel 713C高温合金组织和物相影响的研究

International journal of engineering. Transactions A: basics Pub Date : 2017-07-07 DOI: 10.5829/ije.2017.30.10a.15

M. Azadi, M. Iziy, A. Marbout, M. H. Rizi

{"title":"Investigation of the Heat Treatment Effect on Microstructures and Phases of Inconel 713C Superalloy","authors":"M. Azadi, M. Iziy, A. Marbout, M. H. Rizi","doi":"10.5829/ije.2017.30.10a.15","DOIUrl":"https://doi.org/10.5829/ije.2017.30.10a.15","url":null,"abstract":"The application of Inconel 713C is very vast in different industries such as in automobiles, aircrafts, boilers and turbines. In this paper, Inconel 713C specimens were solutionized at 1000 and 1200 °C for 1 hours in order to study changes in phases and the structure of alloy to modify the γ' phase. The optical and the scanning electron microscopy were used to investigate the structure and the energy dispersive spectroscopic (EDS) and the X-ray diffraction (XRD) were applied to identify the composition and phase changes. Results showed that the solutioning heat treatment at 1000 °C for 1 hour caused to participate Cr23C6, but when the temperature of heat treatment increased to 1200°C, chromium carbides solutionized in the γ matrix. Besides, by applying the heat treatment at temperature of 1000 °C, the γ' phase dissolved in (200) and (220) plane and this phase in the plane of (111) had the best stability. However the (220) plane of γ' phase was stable thermodynamically for the specimen without the heat treatment. Phases of Ni5Al3 and Al0.42Ni0.58 were observed at the temperatures of 1000 and 1200 °C, respectively. In addition, as the heat treatment temperature increased from 1000 to 1200 °C the new phase of AlNi3C0.5 solutionized in the γ matrix.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121760020","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

Thermal Performance of Jet Impingement with Spent Flow Management 废流管理下射流冲击热性能研究

International journal of engineering. Transactions A: basics Pub Date : 2017-07-07 DOI: 10.5829/IJE.2017.30.10A.22

A. Husain, M. Ariz

引用次数: 6

Improved Adaptive Median Filter Algorithm for Removing Impulse Noise from Grayscale Images 灰度图像脉冲噪声去除的改进自适应中值滤波算法

International journal of engineering. Transactions A: basics Pub Date : 2017-07-07 DOI: 10.5829/ije.2017.30.10a.11

R. Tang, Xiaoping Zhou, D. Wang

引用次数: 4