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Review of applying X-ray computed tomography for imaging soil-root physical and biological processes

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International Journal of Agricultural and Biological Engineering 2015年第5期8卷 1-14页

作者： Francis Kumi Mao Hanping Hu Jianping ikram Ullah Key Laboratory of Modern Agricultural Equipment and Technology Ministry of Education and Jiangsu ProvinceJiangsu UniversityZhenjiang 212013China Department of Agricultural Engineering University of Cape CoastCape CoastGhana

Root growth process in soils has long been a matter of interest to soil and plant *** the opaque nature of the soil has been a barrier to most research attempts aimed at unraveling the full root-soil *** traditional method of separating the roots from the growth media which is common practice tends to be destructive and defeats the purpose of such *** is ineffective in monitoring the interactions within the soil medium and as a result,a fast non-destructive technique is ***,with computing and technological advancements,X-ray computed tomography(CT)has been found to be capable of meeting this need by imaging the processes which are of interest to *** the past three-four decades,the applications of the technology for imaging soil-root studies have attracted the researchers’widespread interests and the future looks more *** purpose of this review is to present an overview of CT applications in imaging root-soil *** main focus is on the use of soil-root interface researches and the way forward for such non-destructive analyses.

关键词： computed tomography soil root imaging non-destructive interactions

Three-dimensional flow of Powell–Eyring nanofluid with heat and mass flux boundary conditions

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Chinese Physics B 2016年第7期25卷 261-268页

作者： Tasawar Hayat ikram Ullah Taseer Muhammad Ahmed Alsaedi Sabir Ali Shehzad Department of Mathematics Quaid-I-Azam University Nonlinear Analysis and Applied Mathematics (NAAM) Research Group Department of Mathematics Faculty of ScienceKing Abdulaziz University Department of Mathematics Comsats Institute of Information Technology

This article investigates the three-dimensional flow of Powell–Eyring nanofluid with thermophoresis and Brownian motion effects. The energy equation is considered in the presence of thermal radiation. The heat and mass flux conditions are taken into account. Mathematical formulation is carried out through the boundary layer approach. The governing partial differential equations are transformed into the nonlinear ordinary differential equations through suitable variables. The resulting nonlinear ordinary differential equations have been solved for the series solutions. Effects of emerging physical parameters on the temperature and nanoparticles concentration are plotted and discussed. Numerical values of local Nusselt and Sherwood numbers are computed and examined.

关键词： three-dimensional flow Powell–Eyring fluid nanoparticles thermal radiation

Impact of Fractures and Diagenesis on Reservoir Potential of Inner Ramp Paleocene Carbonates Exposed in Western Part of the Lesser Himalayas of Pakistan

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Journal of Earth Science 2023年第2期34卷 536-555页

作者： Waleed Tariq Gohar Rehman Syed Ahsan Hussain Gardezi Nawaz ikram National Center of Excellence in Geology University of PeshawarPeshawarKhyber Pakhtunkhwa 25120Pakistan Department of Geology University of PeshawarPeshawarKhyber Pakhtunkhwa 25120Pakistan Geological Survey of Pakistan Azad Jammu&Kashmir DirectorateMuzaffarabad 13100Pakistan Institute of Geology University of Azad Jammu&KashmirMuzaffarabad 13100Pakistan

The outcrop investigations provide a better comprehension to interrelate facies-diagenesis and fracture networks for the evaluation of reservoir potential of the carbonate *** this paper,we targeted Kahi-Section(Nizampur Basin)and Peeran Tangai-Section(Kalachitta Range)to analyze structural-kinematics,Discrete Fracture Network Modelling,microfacies identification and diagenesis to interpret their impact on reservoir potential of Lockhart Limestone(Paleocene).The structural grain within the study area mostly represents the typical east-west trending tight to overturned folds and north-dipping thrust faults that mimic the north-south Indo-Eurasian ***,a second phase of deformation related to east-west compressions also identified which rotated the axes of preexisting *** analysis revealed that extensional fractures are oriented at high angle to bedding and are differentiated into three orthogonal sets trending northeast-southwest,northwest-southeast and east-west,whereas,the shear fractures formed two conjugate sets trending *** Lockhart Limestone was deposited in the inner ramp setting and microfacies types are packstone,wackestone and wacke-packstone with seven sub-microfacies *** has been identified that the Lockhart Limestone has the heterogeneous distribution of diagenetic and tectonic features throughout its *** observed diagenetic sequence is micritization,calcite cementation,dissolution,neomorphism,pyritization and *** results highlight that open and partially filled fractures may provide an interconnected network to promote fluid mobility,leading to higher values of fracture *** porosity values of the pore matrix were greater than fracture,resulting a significant impact on reservoir storage *** contrast,a negative impact on reservoir potential has been shown by stylolites,veins and dissolution ***,based on the overall studies,the Lockhart Limestone reve

关键词： lockhart limestone discrete fracture network modelling facies-diagenesis reservoir potential Nizampur Basin petroleum geology

In situ-based assessment of soil liquefaction potential-Case study of an earth dam in Tunisia

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Frontiers of Structural and Civil Engineering 2014年第4期8卷 456-461页

作者： ikram GUETTAYA Mohamed Ridha EL OUNI Department of Rural Engineering National Agronomic Institute of Tunis Tunis 1082 Tunisia

The present paper examines the evaluation of liquefaction potential of an earth dam foundation in Tunisia. The assessment of soil liquefaction was made using deterministic and probabilistic simplified procedures developed from several case histories. The data collected from the field investigation performed before and after the vibrocompaction are analyzed and the results are reported. The obtained results show that after vibrocompaction, a significant improvement of the soil resistance reduces the liquefaction potential of the sandy foundation. Indeed, in the untreated layers, the factor of safety FS drops below 1 which means that the soil is susceptible for liquefaction. However, in the compacted horizons, the values of FS exceed the unit which justifies the absence of liquefaction hazard of the foundation.

关键词： liquefaction cone penetration test (CPT) standard penetration test (SPT) vibrcompaction sand

Mass dependence of pion-induced fission cross sections on the level density parameter

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Chinese Physics C 2012年第9期36卷 831-835页

作者： Zafar Yasin Warda Iram M.ikram Shahzad Physics Division PINSTECHP.O.NiloreIslamabadPakistan Physics Department Islamia UniversityBahawalpurPakistan

Fission probabilities and fission cross sections strongly depend on the mass number of the target and energy of the projectile. In this research work, a cascade-exciton model （using CEM95 computer code） has been implemented to observe the dependence of pion-induced fission cross sections and fission probabilities on the target mass and ratio of the level density parameter in fission to neutron emission. The analysis has been performed for both the positive and negative pions as the projectile at 80, 100 and 150 MeV energies. The computed cross sections satisfactorily reproduced the experimental findings when compared with the available experimental data in the literature. We observed a smooth dependence at 150 MeV, and a sharper dependence at 80 and 100 MeV pion energy, in the fissility region above 29.44.

关键词： CEM95 fission cross section level density parameter

Cascade-exciton model analysis of mass dependence of pion-induced fission

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Chinese Physics C 2014年第7期38卷 92-96页

作者： Muhammad ikram Shahzad Zafar Yasin Warda Iram Shahida Jabeen Physics Division PINSTECH P.O. Nilore Islamabad Pakistan Physics Department Islamia University Bahawalpur Pakistan Physics Department AJ&K University Muzaffarbad Pakistan

The cascade-exciton model has been used to observe the dependence of pion induced fission cross sections on the mass of the target. The analysis has been performed at energies 80 MeV, 100 MeV and 150 MeV for both the positive and negative pions. It has been shown that a single value of the ratio af/an can satisfactorily reproduce the experimental findings when compared with the available experimental data in the literature. The general trend of the fission cross sections with mass （fissility parameter） is seen to be low and slowly changing for the lighter nuclei, and it will steeply rise for the heavy nuclei.

关键词： cascade-exciton model pion-induced fission cross sections

Cascade-exciton model analysis of level density parameter dependence in proton induced fission cross sections of some sub-actinide nuclei

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Chinese Physics C 2011年第11期35卷 1013-1016页

作者： Zafar Yasin Warda Iram Muhammad Asghar M. ikram Shahza Physics Division Directorate of SciencePINSTECH Physics Department Islamia University Pakistan Institute of Engineering and Applied Sciences

Fission cross sections strongly depend on the ratio of the level density parameter in fission to neutron emission, af/an . In this work, a cascade-exciton model implemented in the code CEM95 has been used to observe this effect for proton induced fission cross sections of tungsten, lead and bismuth. The method was employed using different level density parameter ratios for each fission cross section calculation. The calculated fission cross sections are compared with the available experimental data in the literature. It has been observed that a change of the ratio of the level density parameter, af/an , is necessary with the incident energy of the proton, to best estimate the fission cross sections in CEM95.

关键词： CEM95 fission cross sections level density parameter

Biodegradation of Leather Waste by Enzymatic Treatment

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过程工程学报 2006年第3期6卷 462-465页

作者： Muhammad Nauman Aftab Abdul Hameed ikram-ul-Haq 陈润生 Dept. Biol. Sci. Quaid-i-Azam Univ.IslamabadPakistan Bioinformatics LabInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of SciencesBeijing 100049China Dept. Biol. Sci. Quaid-i-Azam Univ.IslamabadPakistan Dept. Botany Government College Univ.LahorePakistan Bioinformatics Lab Institute of BiophysicsChinese Academy of SciencesBeijing 100101China

The treatment of shavings,trimmings and splits of leather waste from tanneries has a potential to generate value-added products. In this study enzymatic treatment of leather waste was performed. This method utilizes alkaline protease produced by Bacillus subtilis in our laboratory by submerged fermentation. Optimum conditions of pH,time duration,temperature and concentration of enzyme were determined for maximum degradation of leather waste. The amount of degradation was measured by the release of amino acid hydroxyproline. Amino acid composition in the hydrolysate obtained by the enzyme hydrolysis was determined. This relative simple biotreatment of leather waste may provide a practical and economical solution.

关键词： leather waste biodegadation Bacillus subtilis alkaline protease

Fuzzy-Based Sentiment Analysis System for Analyzing Student Feedback and Satisfaction

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Computers, Materials & Continua 2020年第2期62卷 631-655页

作者： Yun Wang Fazli Subhan Shahaboddin Shamshirband Muhammad Zubair Asghar ikram UllahAmmara Habib School of Public Administration Zhengzhou UniversityZhengzhouChina National University of Modern Languages IslamabadPakistan Department for Management of Science and Technology Development Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Information Technology Ton Duc Thang UniversityHo Chi Minh CityViet Nam Institute of Computing and Information Technology Gomal UniversityD.I.Khan(KP)Pakistan

The feedback collection and analysis has remained an important subject matter for *** traditional techniques for student feedback analysis are based on questionnaire-based data collection and ***,the student expresses their feedback opinions on online social media sites,which need to be *** study aims at the development of fuzzy-based sentiment analysis system for analyzing student feedback and satisfaction by assigning proper sentiment score to opinion words and polarity shifters present in the input *** technique computes the sentiment score of student feedback reviews and then applies a fuzzy-logic module to analyze and quantify student’s satisfaction at the fine-grained *** experimental results reveal that the proposed work has outperformed the baseline studies as well as state-of-the-art machine learning classifiers.

关键词： Student feedback analysis sentiments opinion words polarity shifters lexicon-based