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Electrical capacitance volume tomography for measurement soil water infiltration in vessel experiments

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Journal of Central South University 2014年第1期21卷 358-364页

作者： Muhammad Mukhlisin Marlin Ramadhan Baidillah mohd raihan taha Department of Civil and Structural Engineering Universiti Kebangsaan MalaysiaBangiSelangor 43600Malaysia Department of Civil Engineering Polytechnic Negeri SemarangJl.Sudarto SHTembalang 50275SemarangIndonesia

Electrical capacitance volume tomography(ECVT) is a recently-developed technique for real-time,non-invasive 3D monitoring of processes involving materials with strong contrasts in dielectric *** work is first application of the method to visualization of water flow in *** describe the principles behind the method,and then demonstrate its use with a simple laboratory infiltration experiment.32 ECVT sensors were installed on the sides of an empty PVC *** was poured into the column at a constant rate,and ECVT data were collected every *** column was then packed with dry sand and again supplied with water at a constant rate with data collected every *** were analyzed to give bulk average water contents,which proved consistent with the water supply *** were also analyzed to give 3D images(216 voxels) allowing visualization of the water distribution during the *** of this work shows that water infiltration into the soil,wall flow,progress of the unstable wetting front and the final water distribution are clearly visible.

关键词： soil water infiltration electrical capacitance volume tomography real time imaging

Modified particle swarm optimization for optimum design of spread footing and retaining wall

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第6期12卷 415-427页

作者： Mohammad KHAJEHZADEH mohd raihan taha Ahmed EL-SHAFIE Mahdiyeh ESLAMI Department of Civil Engineering Anar BranchIslamic Azad University Department of Civil and Structural Engineering University Kebangsaan Malaysia Department of Electrical Engineering Anar BranchIslamic Azad University

This paper deals with the economically optimized design and sensitivity of two of the most widely used systems in geotechnical engineering: spread footing and retaining wall. Several recent advanced optimization methods have been developed, but very few of these methods have been applied to geotechnical problems. The current research develops a modified particle swarm optimization (MPSO) approach to obtain the optimum design of spread footing and retaining wall. The algorithm handles the problem-specific constraints using a penalty function approach. The optimization procedure controls all geotechnical and structural design constraints while reducing the overall cost of the structures. To verify the effectiveness and robustness of the proposed algorithm, three case studies of spread footing and retaining wall are illustrated. Comparison of the results of the present method, standard PSO, and other selected methods employed in previous studies shows the reliability and accuracy of the algorithm. Moreover, the parametric performance is investigated in order to examine the effect of relevant variables on the optimum design of the footing and the retaining structure utilizing the proposed method.

关键词： Particle swarm optimization (PSO) Spread footing Retaining wall Sensitivity analysis

Influence of axial load on the lateral pile groups response in cohesionless and cohesive soil

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Frontiers of Structural and Civil Engineering 2015年第2期9卷 176-193页

作者： Jasim M. ABBASA Zamri CHIK mohd raihan taha Department of Civil Engineering Diyala University Diyala Baqhuba 32001 Iraq Department of Civil and Structural Engineering Universiti Kebangsaan Malaysia Bangi Selangor 43600 UKM Malaysia

The lateral response of single and group of piles under simultaneous vertical and lateral loads has been analyzed using a 3D finite element approach. The response in this assessment considered lateral pile displacement and lateral soil resistance and corresponding - curve. As a result, modified - curves for lateral single pile response were improved with respect to the influence of increasing axial load intensities. The improved plots can be used for lateral loaded pile design and to produce the group action design -multiplier curves and equations. The effect of load combination on the lateral pile group response was performed on three pile group configurations (i.e., 2×1, 2×2 and 3×2) with four pile spacings (i.e., = 2 , 4 , 6 and 8 ). As a result, design curves were developed and applied on the actual case studies and similar expected cases for assessment of pile group behavior using improved p-multiplier. A design equation was derived from predicted design curves to be used in the evaluation of the lateral pile group action taking into account the effect of axial load intensities. It was found that the group interaction effect led to reduced lateral resistance for the pile in the group relative to that for the single pile in case of pure lateral load. While, in case of simultaneous combined loads, large axial load intensities (i.e., more than 6 , where is lateral load values) will have an increase in -multiplier by approximately 100% and will consequently contribute to greater group piles capacities.

关键词： piles pile group spacing configuration combined load

Improved sprinkler irrigation layouts for smallholders

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International Journal of Agricultural and Biological Engineering 2022年第24期15卷 30-38页

作者： Saeed Rad Lei Gan Junfeng Dai Shuaipu Zhang Liangliang Huang Linyan Pan mohd raihan taha Guilin University of Technology College of Environmental Science and EngineeringGuilin 541004China Guilin University of Technology Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst AreaGuilin 541004China Guangxi Key Laboratory of Environmental Pollution Control Theory&Technology Guilin University of Technology Guilin 541004China Department of Civil Engineering University Kebangsaan MalaysiaBandar Baru Bangi 43600 UKMSelangorMalaysia

Pressurized irrigation systems are economically justifiable for medium-to large-scale farms,while fewer choices are available for *** current research work provides additional options for small plots,as the only income source for low-income farmers in poorer countries,which produce a considerable portion of the agricultural products in some regions of the *** this research,two novel layouts of a semipermanent sprinkler irrigation system,namely,clock hand(CH)and corner pivot(CP)lateral designs,were designed for a lighter irrigation system to lower the cost *** new techniques were based on a quadrant/full circle movement pattern of manually pivoting laterals,with no/shorter main pipe requirements,which causes a higher system *** retrofitted layouts were examined in different farms with areas of 0.20 hm^(2),0.81 hm^(2),1.62 hm^(2),and 3.24 hm^(2) in Guangxi,*** study introduced,analyzed,and compared the layouts with the widespread traditional split lateral method on technical planning,components,implementation,operation details,size optimization,performance evaluation,and economic *** comparison with the traditional system,CH and CP were found to be more user-friendly and cost-effective but slightly complicated in design with higher required manual *** results revealed a distribution uniformity(LQDU)of 81.0%to 84.0%via the catch can method,lower capital costs(35.0%-45.0%),and lower annual expenses(6.5%-9.8%)for CP and CH,respectively,compared to the split lateral *** 0.81 hm^(2) and 1.62 hm^(2) farms were found to be the optimum farm sizes for implementation of the new methods for a 25-year project time *** outcomes of this experimental work can encourage small farm owners with limited capital to apply pressurized systems for efficient irrigation and water resource sustainability.

关键词： sprinkler irrigation layout semipermanent smallholder cost-effectiveness

A new hybrid algorithm for global optimization and slope stability evaluation

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Journal of Central South University 2013年第11期20卷 3265-3273页

作者： taha mohd raihan Khajehzadeh Mohammad Eslami Mahdiyeh Civil and Structural Engineering Department National University of Malaysia Civil Engineering Department Anar BranchIslamic Azad University Electrical Engineering Department Science and Research BranchIslamic Azad University

A new hybrid optimization algorithm was presented by integrating the gravitational search algorithm （GSA） with the sequential quadratic programming （SQP）, namely GSA-SQP, for solving global optimization problems and minimization of factor of safety in slope stability analysis. The new algorithm combines the global exploration ability of the GSA to converge rapidly to a near optimum solution. In addition, it uses the accurate local exploitation ability of the SQP to accelerate the search process and find an accurate solution. A set of five well-known benchmark optimization problems was used to validate the performance of the GSA-SQP as a global optimization algorithm and facilitate comparison with the classical GSA. In addition, the effectiveness of the proposed method for slope stability analysis was investigated using three ease studies of slope stability problems from the literature. The factor of safety of earth slopes was evaluated using the Morgenstern-Price method. The numerical experiments demonstrate that the hybrid algorithm converges faster to a significantly more accurate final solution for a variety of benchmark test functions and slope stability problems.

关键词： gravitational search algorithm sequential quadratic programming hybrid algorithm global optimization slope stability

Synthesis and controlled release of cloprop herbicides from cloprop-layered double hydroxide and cloprop-zinc-layered hydroxide nanocomposites

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Open Journal of Inorganic Chemistry 2014年第1期4卷 1-9页

作者： Norhayati Hashim mohd Zobir Hussein Illyas Md Isa Azlan Kamari Azmi Mohamed Adila Mohamad Jaafar Hafsah taha Department of Chemistry Faculty of Science and Mathematics Universiti Pendidikan Sultan Idris Tanjong Malim Malaysia Department of Chemistry Faculty of Science and Mathematics Universiti Pendidikan Sultan Idris Tanjong Malim Malaysia Nanotechnology Research Centre Faculty of Science and Mathematics Universiti Pendidikan Sultan Idris Tanjong Malim Malaysia Department of Chemistry Faculty of Science Universiti Putra Malaysia Serdang Malaysia

Two phenoxyherbicide nanocomposites, namely cloprop-layered double hydroxide and cloprop-zinc- layered hydroxide nanocomposites, have been synthesized by using co-precipitation and direct reaction method. PXRD pattern showed an expansion of interlayer spacing with the value of 21.0 Åand 22.7 Åfor cloprop-layered double hydroxide and cloprop-zinc-layered hydroxide nanocomposite, respectively. It is evident from FTIR and elemental analyses that both nanocomposites were successfully intercalated between the interlayers of layered metal hydroxide. Controlled release of cloprop anion from interlayer of nanocomposites for both cloprop-layered double hydroxide and cloprop-zinc-layered hydroxide nanocomposite into phosphate solution was rapid initially and slow thereafter. The percentage of accumulated release of cloprop anion from cloprop-zinc-layered hydroxide nanocomposite was slightly higher than that from cloprop-layered double hydroxide nanocomposite. Kinetic behavior of cloprop release was governed by pseudo-second-order for cloprop-layered double hydroxide nanocomposite while parabolic diffusion for cloprop-zinc-layered hydroxide nanocomposite. Results from this study highlight the potential of both nanocomposites as capsulated material for controlled release of cloprop phenoxyherbicides anion.

关键词： Cloprop Cloprop-Layered Double Hydroxide Cloprop-Zinc-Layered Hydroxide Nanocomposite Controlled Release Kinetic Study