Journal of the Association of Arab Universities for Basic and Applied Sciences最新文献_第9页

Green inhibitors for corrosion protection in acidizing oilfield environment 用于酸化油田环境的绿色缓蚀剂

Journal of the Association of Arab Universities for Basic and Applied Sciences Pub Date : 2017-10-01 DOI: 10.1016/j.jaubas.2016.08.001

Sunday Aribo, Sunday J. Olusegun, Leonard J. Ibhadiyi, Akinlabi Oyetunji, Davies O. Folorunso

引用次数: 50

Mesoporosity, thermochemical and probabilistic failure analysis of fired locally sourced kaolinitic clay 煅烧本地高岭石粘土的介孔、热化学和概率破坏分析

Journal of the Association of Arab Universities for Basic and Applied Sciences Pub Date : 2017-10-01 DOI: 10.1016/j.jaubas.2017.04.002

Muazu Abubakar , Uday Basheer , Norhayati Ahmad

{"title":"Mesoporosity, thermochemical and probabilistic failure analysis of fired locally sourced kaolinitic clay","authors":"Muazu Abubakar , Uday Basheer , Norhayati Ahmad","doi":"10.1016/j.jaubas.2017.04.002","DOIUrl":"10.1016/j.jaubas.2017.04.002","url":null,"abstract":"<div><p>A dense and mesoporous ceramic from locally sourced Nigerian clay under fracture-strength test were produced and the reliability analysis of the fractured strength was conducted using a three-parameter Weibull probability distribution. The samples were prepared by addition of starch (0–20wt%), pressed at 60MPa and fired at 1300°C. The as-received Nigerian clay, dense and porous ceramic were characterized using XRD, XRF, TGA/DTA, PSD, multi-point BET and FESEM. The fracture strength of the samples (33 each) was determined using a three-point bending test. The fracture strength data were analyzed using three-parameter Weibull probability distribution. From the characterization results, a mullite ceramic formed at a sintering temperature of 1300°C. The threshold strength for the three-parameter Weibull provides the strength below which the dense and the porous ceramic will not fail. The Weibull moduli of the ceramics at different starch compositions show that failure modes in these materials are not identical. The Weibull modulus increases with increase in percentage starch from 0% to 15%. However, the value decreases with 20% starch addition. Reliability analysis provides a detailed interpretation and assessment of the fracture strength of the porous ceramics.</p></div>","PeriodicalId":17232,"journal":{"name":"Journal of the Association of Arab Universities for Basic and Applied Sciences","volume":"24 ","pages":"Pages 81-88"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jaubas.2017.04.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75414193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Fully developed flow of non-Newtonian fluids in a straight uniform square duct through porous medium 非牛顿流体在均匀的直方管道中通过多孔介质的充分发展的流动

Journal of the Association of Arab Universities for Basic and Applied Sciences Pub Date : 2017-06-01 DOI: 10.1016/j.jaubas.2016.04.001

M. Devakar, K. Ramesh, Sagar Chouhan, Ankush Raje

引用次数: 19

A one pot, three component synthesis of coumarin hybrid thiosemicarbazone derivatives and their antimicrobial evolution 香豆素杂化硫代氨基脲衍生物的一锅三组分合成及其抑菌进化

Journal of the Association of Arab Universities for Basic and Applied Sciences Pub Date : 2017-06-01 DOI: 10.1016/j.jaubas.2016.04.002

Rajesh H. Vekariya , Kinjal D. Patel , Dhanji P. Rajani , Smita D. Rajani , Hitesh D. Patel

引用次数: 21

Assessment of adsorption kinetics for removal potential of Crystal Violet dye from aqueous solutions using Moroccan pyrophyllite 摩洛哥叶蜡石对结晶紫染料水溶液去除电位的吸附动力学评价

Journal of the Association of Arab Universities for Basic and Applied Sciences Pub Date : 2017-06-01 DOI: 10.1016/j.jaubas.2016.06.001

Youssef Miyah , Anissa Lahrichi , Meryem Idrissi , Saïd Boujraf , Hasnae Taouda , Farid Zerrouq

{"title":"Assessment of adsorption kinetics for removal potential of Crystal Violet dye from aqueous solutions using Moroccan pyrophyllite","authors":"Youssef Miyah , Anissa Lahrichi , Meryem Idrissi , Saïd Boujraf , Hasnae Taouda , Farid Zerrouq","doi":"10.1016/j.jaubas.2016.06.001","DOIUrl":"10.1016/j.jaubas.2016.06.001","url":null,"abstract":"<div><p>This study involves the adsorption of Crystal Violet (CV) dye adsorbed from solution on the pyrophyllite’s surface. The batch technique was used under a variety of conditions to produce quantitative adsorption, namely amount of adsorbent, dye concentration, contact time, pH solution and temperature. The maximum adsorption capacity of Crystal Violet on pyrophyllite was 9.58mg/g for 10mg/L of CV concentration, pH=6.8 at a temperature 20°C and 1g/L of adsorbent. This study of adsorption kinetics was carried out within framework of three models: intraparticle diffusion, pseudo-first order and pseudo-second order. The experimental isotherm data were analyzed using Langmuir and Freundlich models. Different thermodynamic parameters have shown spontaneous reaction with endothermic nature (The estimated value for Δ<em>G</em> was −7.64kJ/mol at 293K). Various techniques for characterizing the adsorbent were applied including X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) coupled by energy dispersive X-ray spectroscopy (EDX). In addition, the regenerated adsorbents technique was reused several times; this demonstrated an economical aspect of using pyrophyllite which underlines the re-use importance considering the material capacity to regenerate.</p></div>","PeriodicalId":17232,"journal":{"name":"Journal of the Association of Arab Universities for Basic and Applied Sciences","volume":"23 ","pages":"Pages 20-28"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jaubas.2016.06.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73803398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 114

Money laundering regulatory risk evaluation using Bitmap Index-based Decision Tree 基于位图索引决策树的洗钱监管风险评估

Journal of the Association of Arab Universities for Basic and Applied Sciences Pub Date : 2017-06-01 DOI: 10.1016/j.jaubas.2016.03.001

Vikas Jayasree, R.V. Siva Balan

{"title":"Money laundering regulatory risk evaluation using Bitmap Index-based Decision Tree","authors":"Vikas Jayasree, R.V. Siva Balan","doi":"10.1016/j.jaubas.2016.03.001","DOIUrl":"10.1016/j.jaubas.2016.03.001","url":null,"abstract":"<div><p>This paper proposes to evaluate the adaptability risk in money laundering using Bitmap Index-based Decision Tree (BIDT) technique. Initially, the Bitmap Index-based Decision Tree learning is used to induce the knowledge tree which helps to determine a company’s money laundering risk and improve scalability. A bitmap index in BIDT is used to effectively access large banking databases. In a BIDT bitmap index, account in a table is numbered in sequence with each key value, account number and a bitmap (array of bytes) used instead of a list of row ids. Subsequently, BIDT algorithm uses the “select” query performance to apply count and bit-wise logical operations on AND. Query result coincides exactly to build a decision tree and more precisely to evaluate the adaptability risk in the money laundering operation. For the root node, the main account of the decision tree, the population frequencies are obtained by simply counting the total number of “1” in the bitmaps constructed on the attribute to predict money laundering and evaluate the risk factor rate. The experiment is conducted on factors such as regulatory risk rate, false positive rate, and risk identification time.</p></div>","PeriodicalId":17232,"journal":{"name":"Journal of the Association of Arab Universities for Basic and Applied Sciences","volume":"23 ","pages":"Pages 96-102"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jaubas.2016.03.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88932297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21

Determination of iron, cobalt and nickel ions from aqueous media using the alkali modified miswak 碱改性miswak法测定水介质中铁、钴、镍离子

Journal of the Association of Arab Universities for Basic and Applied Sciences Pub Date : 2017-06-01 DOI: 10.1016/j.jaubas.2016.07.002

E.A. Moawed , M.A. El-ghamry , M.A. El-Hagrasy , M.F. El-Shahat

{"title":"Determination of iron, cobalt and nickel ions from aqueous media using the alkali modified miswak","authors":"E.A. Moawed , M.A. El-ghamry , M.A. El-Hagrasy , M.F. El-Shahat","doi":"10.1016/j.jaubas.2016.07.002","DOIUrl":"10.1016/j.jaubas.2016.07.002","url":null,"abstract":"<div><p>This paper describes a simple, rapid, inexpensive method for the preparation of a new biosorbent based on the modification of miswak fibers by NaOH (AT-Miswak-F). The synthesized AT-Miswak-F sorbent was utilized as an efficient sorbent for the extraction and preconcentration of iron group metal ions from various water samples. In this study, it was found that Fe(III), Co(II) and Ni(II) ions were completely extracted (100%) at pH range of 3–7 and flow rate of 0.3–2.0mLmin<sup>−1</sup>. Also, the sorption capacity of AT-Miswak-F for Fe(III), Co(II) and Ni(II) are 0.54, 0.24 and 0.15mmolg<sup>−1</sup>, respectively. Equilibrium was best described by Freundlich isotherm model (<em>R</em><sup>2</sup>    min<sup>−1</sup>, respectively. Under the optimized conditions, the method exhibited a detection limit of 1.4, 2.8 and 2.1ngmL<sup>−1</sup> for Fe(III), Co(II) and Ni(II) ions in water samples with relative standard deviations of 2.6% (<em>n</em>  <!-->4). The method was successfully applied for the determination of Fe(III), Co(II) and Ni(II) ions in sea, ground and contaminated water samples.</p></div>","PeriodicalId":17232,"journal":{"name":"Journal of the Association of Arab Universities for Basic and Applied Sciences","volume":"23 ","pages":"Pages 43-51"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jaubas.2016.07.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72630719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Shortening full-length aptamer by crawling base deletion – Assisted by Mfold web server application 通过爬行碱基删除缩短全长适体- Mfold web服务器应用程序辅助

Journal of the Association of Arab Universities for Basic and Applied Sciences Pub Date : 2017-06-01 DOI: 10.1016/j.jaubas.2016.07.001

Subash C.B. Gopinath , Thangavel Lakshmipriya , M.K. Md Arshad , C.H. Voon , Tijjani Adam , Uda Hashim , Harbant Singh , Suresh V. Chinni

{"title":"Shortening full-length aptamer by crawling base deletion – Assisted by Mfold web server application","authors":"Subash C.B. Gopinath , Thangavel Lakshmipriya , M.K. Md Arshad , C.H. Voon , Tijjani Adam , Uda Hashim , Harbant Singh , Suresh V. Chinni","doi":"10.1016/j.jaubas.2016.07.001","DOIUrl":"10.1016/j.jaubas.2016.07.001","url":null,"abstract":"<div><p>Systematic Evolution of Ligands by EXponential enrichment (SELEX) is the method to select the specific aptamer against a wide range of targets. For this process, the initial library usually has a length of random sequences from ∼25 and it reaches over 100 bases. The lengthy sequences have disadvantages such as difficult to prepare, less stable and expensive. It is wise to prefer shorter version of aptamer for a wide range of applications including drug delivery process. It is a common practice to shorten the full-length aptamer by mapping analyses and it is tedious. Here, we used a crawling method to shorten the aptamer by different sequential deletion of bases from both 5′ and 3′ ends, assisted by Mfold web server application. Two different kinds of aptamer with varied lengths (randomized region of 30 and 74 bases) were desired for this study, generated against Influenza A/Panama/2007/1999 (H3N2) and gD protein of Herpes Simplex Virus-1. It was found that shortening the aptamer length by crawling pattern is possible with the assistance of Mfold web server application. The obtained results resemble the shortened aptamer derived by mapping analyses. The proposed strategy is recommended to predict the shorter aptamer without involving any wet experimental section.</p></div>","PeriodicalId":17232,"journal":{"name":"Journal of the Association of Arab Universities for Basic and Applied Sciences","volume":"23 ","pages":"Pages 37-42"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jaubas.2016.07.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90809931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Unsteady three-dimensional MHD flow of a nano Eyring-Powell fluid past a convectively heated stretching sheet in the presence of thermal radiation, viscous dissipation and Joule heating 在热辐射、粘性耗散和焦耳加热作用下，纳米埃林-鲍威尔流体通过对流加热拉伸片的非定常三维MHD流动

Journal of the Association of Arab Universities for Basic and Applied Sciences Pub Date : 2017-06-01 DOI: 10.1016/j.jaubas.2016.05.004

B. Mahanthesh , B.J. Gireesha , Rama Subba Reddy Gorla

{"title":"Unsteady three-dimensional MHD flow of a nano Eyring-Powell fluid past a convectively heated stretching sheet in the presence of thermal radiation, viscous dissipation and Joule heating","authors":"B. Mahanthesh , B.J. Gireesha , Rama Subba Reddy Gorla","doi":"10.1016/j.jaubas.2016.05.004","DOIUrl":"10.1016/j.jaubas.2016.05.004","url":null,"abstract":"<div><p>The purpose of this study is to investigate the unsteady magnetohydrodynamic three-dimensional flow induced by a stretching surface. An incompressible electrically conducting Eyring-Powell fluid fills the convectively heated stretching surface in the presence of nanoparticles. The effects of thermal radiation, viscous dissipation and Joule heating are accounted in heat transfer equation. The model used for the nanofluid includes the effects of Brownian motion and thermophoresis. The highly nonlinear partial differential equations are reduced to ordinary differential equations with the help of similarity method. The reduced complicated two-point boundary value problem is treated numerically using Runge–Kutta–Fehlberg 45 method with shooting technique. A comparison of the obtained numerical results with existing results in a limiting sense is also presented. At the end, the effects of influential parameters on velocity, temperature and nanoparticles concentration fields are also discussed comprehensively. Further, the physical quantities of engineering interest such as the Nusselt number and Sherwood number are also calculated.</p></div>","PeriodicalId":17232,"journal":{"name":"Journal of the Association of Arab Universities for Basic and Applied Sciences","volume":"23 ","pages":"Pages 75-84"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jaubas.2016.05.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81853650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 98

Stability and ultimate boundedness of solutions of some third order differential equations with delay 一类三阶时滞微分方程解的稳定性和极限有界性

Journal of the Association of Arab Universities for Basic and Applied Sciences Pub Date : 2017-06-01 DOI: 10.1016/j.jaubas.2016.05.002

M. Remili, D. Beldjerd

引用次数: 17