发布求助
文献互助 智能选刊 最新文献

AlKhawarizmi Engineering Journal最新文献

筛选
英文 中文
Experimental Demonstration of Non-Hermitian Symmetry for DC-SC-FDM in UOWC Systems UOWC系统中DC-SC-FDM非厄米对称的实验证明
AlKhawarizmi Engineering Journal Pub Date : 2021-12-30 DOI: 10.4186/ej.2021.25.12.81
K. Puntsri, E. Khansalee, Hanawa Masanori
{"title":"Experimental Demonstration of Non-Hermitian Symmetry for DC-SC-FDM in UOWC Systems","authors":"K. Puntsri, E. Khansalee, Hanawa Masanori","doi":"10.4186/ej.2021.25.12.81","DOIUrl":"https://doi.org/10.4186/ej.2021.25.12.81","url":null,"abstract":"This study demonstrates the high spectrum efficiency of DC offset single-carrier frequency division multiplexing (DC-SC-FDM) for underwater optical wireless communications (UOWC). I and Q components were separately transmitted using dual lasers. As a result, the requirement of Hermitian symmetry is alleviated, and the computation time latency is reduced. The Gram–Schmidt orthogonalization procedure was adopted to address the I and Q orthogonality. The system comprises a 1024-point inverse fast Fourier transform (IFFT), a cyclic prefix of 32 samples, and a digital-to-analog converter (DAC) of 400 Msps, and laser diodes possess a wavelength of 553 nm with a power of 150 mW. The study includes real transmissions in a freshwater communication channel and reports experimental results. In addition, the bit error rate has been evaluated. The results show that at the forward error correction (FEC) limit, a communication distance of 10 m can be achieved. A peak-to-average power ratio reduction of 4.96 dB is reached.","PeriodicalId":32885,"journal":{"name":"AlKhawarizmi Engineering Journal","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73887576","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
Parametric Optimization of NACA 4412 Airfoil in Ground Effect Using Full Factorial Design of Experiment 基于全因子试验设计的NACA 4412翼型地面效应参数优化
AlKhawarizmi Engineering Journal Pub Date : 2021-12-30 DOI: 10.4186/ej.2021.25.12.9
Shwe Yee, M. Thianwiboon
{"title":"Parametric Optimization of NACA 4412 Airfoil in Ground Effect Using Full Factorial Design of Experiment","authors":"Shwe Yee, M. Thianwiboon","doi":"10.4186/ej.2021.25.12.9","DOIUrl":"https://doi.org/10.4186/ej.2021.25.12.9","url":null,"abstract":"This investigation emphasizes the changes of the lift-to-drag ratio of an airfoil with the variation of ground clearance and angles of attack. Various ground clearances and angles of attack with a fixed speed of 30 m/s are applied to the NACA 4412 airfoil. Computational fluid dynamics (CFD) is used to calculate the aerodynamic coefficients acting on it. To study the influence of these two factors on the lift-to-drag ratio, 32 factorial design based on Design of Experiments (DOE) is utilized. A total of 9 numerical experiments were carried out with Ansys Fluent. When the angle of attack decreases, lift coefficient increases and drag coefficient decreases resulting in a high lift-to-drag ratio: also, the lower the ground clearance, the higher the lift-to-drag ratio. It shows the effectiveness of ground clearance and angle of attack. The analysis shows that either increasing ground clearance or using a higher angle of attack gives a decrement in the lift-to-drag ratio, but there is no interaction between them.","PeriodicalId":32885,"journal":{"name":"AlKhawarizmi Engineering Journal","volume":"84 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76749097","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
Numerical Investigation of Two Double Swirl/Vortex Chamber Configurations for Turbine Blade Leading Edge Cooling 涡轮叶片前缘冷却两种双旋流/涡室结构的数值研究
AlKhawarizmi Engineering Journal Pub Date : 2021-12-30 DOI: 10.4186/ej.2021.25.12.63
Pipat Tansakul, Thanabodee Sinpo, Phongsakorn Thawornsathit, V. Juntasaro, E. Juntasaro
{"title":"Numerical Investigation of Two Double Swirl/Vortex Chamber Configurations for Turbine Blade Leading Edge Cooling","authors":"Pipat Tansakul, Thanabodee Sinpo, Phongsakorn Thawornsathit, V. Juntasaro, E. Juntasaro","doi":"10.4186/ej.2021.25.12.63","DOIUrl":"https://doi.org/10.4186/ej.2021.25.12.63","url":null,"abstract":"The objective of this work is to numerically assess the cooling performance of two double swirl/vortex chamber configurations (DSC and M-DVC). The predictive capability of five turbulence models is critically evaluated on fine and good-quality mesh for impinging and swirling flows. The averaged second norm 2 L is employed to quantitatively measure the simulation error from each turbulence model compared to the experimental data. The RNG k  − turbulence model with enhanced wall treatment is found to be the most accurate and suitable for the simulation of impinging and swirling flows. Various key physical and dimensionless parameters, including thermal performance factor, turbulence kinetic energy and vorticity, are used to comparatively assess the cooling performance of DSC and M-DVC under the laboratory testing condition and the real operating condition at base load. The results reveal that DSC can enhance better heat transfer due to higher turbulence kinetic energy. Also, much more uniform Nusselt number distribution is obtained by DSC owing to more symmetric and uniformly distributed velocity and vorticity. With the real operating condition, DSC even performs much better than M-DVC.","PeriodicalId":32885,"journal":{"name":"AlKhawarizmi Engineering Journal","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86946966","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
Optical Fiber Biosensor toward E-coli Bacterial Detection on the Pollutant Water 光纤生物传感器用于污染水体中大肠杆菌的检测
AlKhawarizmi Engineering Journal Pub Date : 2021-12-30 DOI: 10.4186/ej.2021.25.12.1
H. Fallah, T. Asadishad, G. Parsanasab, S. Harun, Waleed S. Mohammed, M. Yasin
{"title":"Optical Fiber Biosensor toward E-coli Bacterial Detection on the Pollutant Water","authors":"H. Fallah, T. Asadishad, G. Parsanasab, S. Harun, Waleed S. Mohammed, M. Yasin","doi":"10.4186/ej.2021.25.12.1","DOIUrl":"https://doi.org/10.4186/ej.2021.25.12.1","url":null,"abstract":"In this study, Zinc oxide (ZnO) nanorods based fiber optic biosensor has been reported for rapid and sensitive detection of Escherichia Coli (E-coli). A thin layer of Gold nanoparticles (Au) (around 50 nm) is coated on the tip of a multimode plastic optical fiber. ZnO Nanorods are grown on Au layer thorough hydrothermal technique. This sensor showed a very fast response within the first 10 second of contacting the present of polluted water with E-coli Different concentrations of E. coli from (1000 to 4000 CFU/ml) have been tested and a sharp trend of sensitivity was observed. This sensing platform shows promising potential for regular water and food quality monitoring of various pathogenic microorganisms.","PeriodicalId":32885,"journal":{"name":"AlKhawarizmi Engineering Journal","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89707794","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: 5
Optimal Assignment of Customer-Desired Items to the Fetching Robots in Superstores 超市取货机器人对顾客所需物品的最优分配
AlKhawarizmi Engineering Journal Pub Date : 2021-11-30 DOI: 10.4186/ej.2021.25.11.1
Ali Nasir, Muhammad Saadi, R. Gelani, Faisal Mustafa
{"title":"Optimal Assignment of Customer-Desired Items to the Fetching Robots in Superstores","authors":"Ali Nasir, Muhammad Saadi, R. Gelani, Faisal Mustafa","doi":"10.4186/ej.2021.25.11.1","DOIUrl":"https://doi.org/10.4186/ej.2021.25.11.1","url":null,"abstract":"This paper discusses a task assignment problem. The scenario under consideration is a superstore with a team of fetching robots. There is a set of customers each requiring a unique set of items. The goal is to assign the task of fetching the items to the available robots in such a way that the time and effort required for fetching the item is minimized. For this purpose, a Markov Decision Process based model has been proposed. The proposed-model is solvable using stochastic dynamic programming algorithms such as value iteration for the calculation of optimal task assignment policy. The analysis of the characteristics of the resulting optimal policy has been presented with the help of a numerical case study.","PeriodicalId":32885,"journal":{"name":"AlKhawarizmi Engineering Journal","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91186089","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
A Discontinuity-Capturing Methodology for Two-Phase Inviscid Compressible Flow 两相无粘可压缩流的不连续捕获方法
AlKhawarizmi Engineering Journal Pub Date : 2021-11-30 DOI: 10.4186/ej.2021.25.11.45
Jiratrakul Tunkeaw, W. Rojanaratanangkule
{"title":"A Discontinuity-Capturing Methodology for Two-Phase Inviscid Compressible Flow","authors":"Jiratrakul Tunkeaw, W. Rojanaratanangkule","doi":"10.4186/ej.2021.25.11.45","DOIUrl":"https://doi.org/10.4186/ej.2021.25.11.45","url":null,"abstract":"The explicit filtering approach is applied to the quasi-conservative five-equation model of compressible two-phase flows to capture the interface between each fluid and a shock wave. The basic idea of the present filter is to combine a low-order linear filter with a high-order one via a proper discontinuity sensor and optimum linear weights. The capability of the proposed filter in capturing the contact discontinuity and damping the grid-to-grid oscillations is analysed. Various one-dimensional and two-dimensional test cases are performed, namely the interface advection of gas-gas flow, the shockinterface interaction, the gas-liquid Riemann problem, and the inviscid shock-bubble interaction. The numerical results reveal that the present filtering method can accurately capture the propagation of the shock waves and interfaces. Additionally, it produces less spurious oscillations compared with the existing 2nd-order discontinuity-capturing filter.","PeriodicalId":32885,"journal":{"name":"AlKhawarizmi Engineering Journal","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84296809","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
Design of 2D-Lattice Plates by Weight Efficiency 基于重量效率的二维点阵板设计
AlKhawarizmi Engineering Journal Pub Date : 2021-11-30 DOI: 10.4186/ej.2021.25.11.13
Pana Suttakul, Ekachai Chaichanasiri, P. Nanakorn
{"title":"Design of 2D-Lattice Plates by Weight Efficiency","authors":"Pana Suttakul, Ekachai Chaichanasiri, P. Nanakorn","doi":"10.4186/ej.2021.25.11.13","DOIUrl":"https://doi.org/10.4186/ej.2021.25.11.13","url":null,"abstract":"In this study, a method to design 2D-lattice plates, based on their weight efficiency, is proposed. The 2D-lattice plates considered in this study are made up of Euler-Bernoulli beams and can be modeled as homogeneous orthotropic Kirchhoff plates, derived by the strain-energy-based homogenization method. The weight efficiency of 2D-lattice plates is evaluated using relationships between their effective rigidities and area weight densities. The proposed design method is developed with these relationships. The closed-form effective rigidities of 2D-lattice plates, derived by the strain-energy-based homogenization method, are utilized as convenient design formulas for the proposed design method. A generic symbolic finite element program, written in MATLAB, is used to determine the closed-form solutions of effective properties that include the effective elastic constants, the effective rigidities, and the relationships between the effective rigidities and the area weight densities of 2D-lattice plates. Example design graphs, created by the obtained closed-form solutions, for 2D-lattice plates with different unit cells are presented and discussed. In addition, the usefulness of the obtained weight efficiency is also demonstrated via analysis of 2D-lattice plates with different unit-cell patterns.","PeriodicalId":32885,"journal":{"name":"AlKhawarizmi Engineering Journal","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74072022","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: 3
A Study on the Single Caprylic Acid Fractionation and Centrifugal Separation of Equine Rabies Immunoglobulin 马狂犬病免疫球蛋白单辛酸分离与离心分离的研究
AlKhawarizmi Engineering Journal Pub Date : 2021-11-30 DOI: 10.4186/ej.2021.25.11.33
Issada Manohorratad, A. Senjuntichai
{"title":"A Study on the Single Caprylic Acid Fractionation and Centrifugal Separation of Equine Rabies Immunoglobulin","authors":"Issada Manohorratad, A. Senjuntichai","doi":"10.4186/ej.2021.25.11.33","DOIUrl":"https://doi.org/10.4186/ej.2021.25.11.33","url":null,"abstract":"This study proposes alternative caprylic acid precipitation and centrifugal separation for the equine rabies Immunoglobulin manufacturing process. The objective is to determine the optimal setting associated with the centrifugal machine and the optimal amount of caprylic acid for the maximum process yield (%). The experiments were designed based on the central composite design and performed to analyze the relationship of three factors which are the caprylic acid (1%-5%V/V), the rotation speed (7,500-12,500 rpm), and centrifugal time (20-40 min) on the yield of the process. For the first time, the prediction model as a second-degree polynomial regression is presented and developed by a response surface method (RSM) with R2 approximately 51%. RSM model also reveals that the process yield is affected by the concentration of caprylic acid and the amount of time to centrifuge the precipitated plasma but not by the rotation speed of the centrifugal machine. With the predicted process yield of about 12.97%, the optimal setting by RSM suggests the concentration of caprylic acid at 2.82% and the centrifugal time at 28 minutes.","PeriodicalId":32885,"journal":{"name":"AlKhawarizmi Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90619688","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
Green Diesel Production from Oleic Acid Deoxygenation Using Subcritical Water under Hydrogen-Free Condition 亚临界水无氢条件下油酸脱氧生产绿色柴油
AlKhawarizmi Engineering Journal Pub Date : 2021-10-31 DOI: 10.4186/ej.2021.25.10.115
Nitchakul Hongloi, P. Prapainainar, Tanapong Muadmai, Jade Namboonlue, A. Seubsai, Chaiwat Prapainainar
{"title":"Green Diesel Production from Oleic Acid Deoxygenation Using Subcritical Water under Hydrogen-Free Condition","authors":"Nitchakul Hongloi, P. Prapainainar, Tanapong Muadmai, Jade Namboonlue, A. Seubsai, Chaiwat Prapainainar","doi":"10.4186/ej.2021.25.10.115","DOIUrl":"https://doi.org/10.4186/ej.2021.25.10.115","url":null,"abstract":"","PeriodicalId":32885,"journal":{"name":"AlKhawarizmi Engineering Journal","volume":"246 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79718759","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
Strength and Equivalent Modulus of Cement Stabilized Lateritic with Partial Replacement by Fly Ash and Rice Husk Ash 粉煤灰和稻壳灰部分替代水泥稳定红土的强度和等效模量
AlKhawarizmi Engineering Journal Pub Date : 2021-10-31 DOI: 10.4186/ej.2021.25.10.13
R. Sukkarak, Bordin Thangjaroensuk, W. Kongkitkul, P. Jongpradist
{"title":"Strength and Equivalent Modulus of Cement Stabilized Lateritic with Partial Replacement by Fly Ash and Rice Husk Ash","authors":"R. Sukkarak, Bordin Thangjaroensuk, W. Kongkitkul, P. Jongpradist","doi":"10.4186/ej.2021.25.10.13","DOIUrl":"https://doi.org/10.4186/ej.2021.25.10.13","url":null,"abstract":"","PeriodicalId":32885,"journal":{"name":"AlKhawarizmi Engineering Journal","volume":"326 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80374762","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信