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Chinese Journal of Chemical Engineering 2017年第9期25卷 1170-1175页

作者： Tayebeh Esfandiyari Navid Nasirizadeh mohammad Dehghani mohammad Hassan Ehrampoosh Department of Environmental Health Engineering Shaheed Sadoughi University of Medical Sciences Young Researchers and Elite Club Yazd Branch Islamic Azad University

The presence of Hg in the aqueous media is known to cause severe health issues in both humans and *** technologies and especially adsorbents have been applied for its removal. In this study, a graphene oxide–carbon composite(GO–CC) as a new adsorbent was prepared by sol gel procedure and characterized using field emission scanning electron microscopy, BET and EDX. The effects of different variables including solution p H, contact time, adsorbent dose and GO ratio in adsorbent matrix on the removal capacity of Hg were studied. The isotherm data correlated well with the Langmuir isotherm model. Further analysis recommended that the Hg^(2+) adsorption process is governed by the intra-particle and external mass transfer, in which the film diffusion was the rate restrictive step. The presented composite has maximum absorption capacity, q_(max) of 68.8 mg·g^(-1), which is comparable with carbon based adsorbent reported in the previous publications.

关键词： Adsorbent Mercury removal Sol gel Carbon composite

Impact of Industrial Agglomeration on Productivity: Evidence from Iran’s Food Industry

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Chinese Geographical Science 2020年第2期30卷 309-323页

作者： Nastaran NAJKAR mohammad Reza KOHANSAL mohammad GHORBANI Department of Agricultural Economics International Campus of Ferdowsi University of MashhadMashhad ***Iran Department of Agricultural Economics Ferdowsi University of MashhadMashhad ***Iran

This paper aims to examine the effect of agglomeration on firm level productivity in Iran’s food manufacturing by employing a firm level dataset during 1986–2015 among firms for four *** empirical results show that agglomeration in north districts are key factors in productivity *** this work,we apply a spatial Bayes model that uses hierarchical techniques during the three *** productivity clustering map is able to capture such patterns as the high productivity area that appears in the south,north districts of *** paper evaluates the effect of agglomeration on firm productivity in Iran’s food industries at district *** find that regional market potential is the strong predictor of productivity;moreover,industrial agglomeration has a productivity-augmenting impact.

关键词： Agglomeration productivity spatial Bayes hierarchical Iran

A Review of Energy-Related Cost Issues and Prediction Models in Cloud Computing Environments

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Computer Systems Science & Engineering 2021年第2期36卷 353-368页

作者： mohammad Aldossary Department of Computer Science College of Arts and SciencePrince Sattam bin Abdulaziz UniversityAl-KharjSaudi Arabia

With the expansion of cloud computing,optimizing the energy efficiency and cost of the cloud paradigm is considered significantly important,since it directly affects providers’revenue and customers’***,providing prediction information of the cloud services can be very beneficial for the service providers,as they need to carefully predict their business growths and efficiently manage their *** optimize the use of cloud services,predictive mechanisms can be applied to improve resource utilization and reduce energy-related ***,such mechanisms need to be provided with energy awareness not only at the level of the Physical Machine(PM)but also at the level of the Virtual Machine(VM)in order to make improved cost ***,this paper presents a comprehensive literature review on the subject of energy-related cost issues and prediction models in cloud computing environments,along with an overall discussion of the closely related *** outcomes of this research can be used and incorporated by predictive resource management techniques to make improved cost decisions assisted with energy awareness and leverage cloud resources efficiently.

关键词： Cloud computing cost models energy efﬁciency power consumption workload prediction energy prediction cost estimation

An Effective and Secure Quality Assurance System for a Computer Science Program

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Computer Systems Science & Engineering 2022年第6期41卷 975-995页

作者： mohammad Alkhatib Computer Science Department College of Computer and Information SciencesImam Mohammad Ibn Saud Islamic University(IMSIU)RiyadhSaudi Arabia

Improving the quality assurance (QA) processes and acquiring accreditation are top priorities for academic programs. The learning outcomes (LOs)assessment and continuous quality improvement represent core components ofthe quality assurance system (QAS). Current assessment methods suffer deficiencies related to accuracy and reliability, and they lack well-organized processes forcontinuous improvement planning. Moreover, the absence of automation, andintegration in QA processes forms a major obstacle towards developing efficientquality system. There is a pressing need to adopt security protocols that providerequired security services to safeguard the valuable information processed byQAS as well. This research proposes an effective methodology for LOs assessment and continuous improvement processes. The proposed approach ensuresmore accurate and reliable LOs assessment results and provides systematic wayfor utilizing those results in the continuous quality improvement. This systematicand well-specified QA processes were then utilized to model and implement automated and secure QAS that efficiently performs quality-related processes. Theproposed system adopts two security protocols that provide confidentiality, integrity, and authentication for quality data and reports. The security protocols avoidthe source repudiation, which is important in the quality reporting system. This isachieved through implementing powerful cryptographic algorithms. The QASenables efficient data collection and processing required for analysis and interpretation. It also prepares for the development of datasets that can be used in futureartificial intelligence (AI) researches to support decision making and improve thequality of academic programs. The proposed approach is implemented in a successful real case study for a computer science program. The current study servesscientific programs struggling to achieve academic accreditation, and gives rise tofully automating and integrating the

关键词： Quality assurance information security cryptographic algorithms education programs

Impact of industrial effluent on growth and yield of rice(Oryza sativa L.) in silty clay loam soil

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Journal of Environmental Sciences 2015年第4期27卷 231-240页

作者： mohammad Anwar Hossain Golum Kibria Muhammad Mustafizur Rahman mohammad Mizanur Rahman Abul Hossain Molla mohammad Mostafizur Rahman mohammad Khabir Uddin Department of Environmental Sciences Jahangirnagar University Department of Soil Science Bangabandhu Sheikh Mujibur Rahman Agricultural University Department of Bioenvironmental Science Bangabandhu Sheikh Mujibur Rahman Agricultural University

Degradation of soil and water from discharge of untreated industrial effluent is alarming in Bangladesh. Therefore, buildup of heavy metals in soil from contaminated effluent, their entry into the food chain and effects on rice yield were quantified in a pot experiment. The treatments were comprised of 0, 25%, 50%, 75% and 100% industrial effluents applied as irrigation water. Effluents, initial soil, different parts of rice plants and post-harvest pot soil were analyzed for various elements, including heavy metals. Application of elevated levels of effluent contributed to increased heavy metals in pot soils and rice roots due to translocation effects, which were transferred to rice straw and grain. The results indicated that heavy metal toxicity may develop in soil because of contaminated effluent *** metals are not biodegradable, rather they accumulate in soils, and transfer of these metals from effluent to soil and plant cells was found to reduce the growth and development of rice plants and thereby contributed to lower yield. Moreover, a higher concentration of effluent caused heavy metal toxicity as well as reduction of growth and yield of rice, and in the long run a more aggravated situation may threaten human lives,which emphasizes the obligatory adoption of effluent treatment before its release to the environment, and regular monitoring by government agencies needs to be ensured.

关键词： Biomass Crop yield Heavy metal Industrial effluent Soil pollution

Spatial pattern of tree diversity and evenness across forest types in Majella National Park,Italy

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Forest Ecosystems 2015年第4期2卷 304-313页

作者： mohammad Redowan Department of Forestry and Environmental Science Shahjalal University of Science and Technology

Background： Estimation of tree diversity at broader scale is important for conservation planning. Tree diversity should be measured and understood in terms of diversity and evenness, two integral components to describe the structure of a biological community. Variation of the tree diversity and evenness with elevation, topographic relief, aspect, terrain shape, slope, soil nutrient, solar radiation etc. are well documented. Methods： Present study explores the variation of tree diversity （measured as Shannon diversity and evenness indices） of Majella National Park, italy with five available forest types namely evergreen oak woods, deciduous oak woods, blacWaleppo pine stands, hop-hornbeam forest and beech forest, using satellite, environmental and field data. Results： Hop-hornbeam forest was found to be most diverse and even while evergreen Oak woods was the lowest diverse and even. Diversity and evenness of forest types were concurrent to each other i.e. forest type which was more diverse was also more even. As a broad pattern, majority portion of the study area belonged to medium diversity and high evenness class. Conclusions： Satellite images and other GIS data proved useful tools in monitoring variation of tree diversity and evenness across various forest types. Present study findings may have implications in prioritizing conservation zones of high tree diversity at Majella.

关键词： Tree diversity Tree evenness Forest type Shannon diversity index Shannon evenness index Neural network Kappa statistic

Tensile properties and hot tearing susceptibility of cast Al–Cu alloys containing excess Fe and Si

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International Journal of Minerals,Metallurgy and Materials 2021年第4期28卷 718-728页

作者： Khalil Ganjehfard Reza Taghiabadi mohammad Talafi Noghani mohammad Hossein Ghoncheh Faculty of Engineering Imam Khomeini International University(IKIU)QazvinIran Department of Mechanical Engineering University of New BrunswickFrederictonNBCanada

This study was undertaken to investigate the tensile properties and hot tearing susceptibility of cast Al–Cu alloys containing excess Fe(up to 1.5 wt%)and Si(up to 2.5 wt%).According to the results,the optimum tensile properties and hot tearing resistance were achieved at Fe/Si mass ratio of 1,where theα-Fe phase was the dominant Fe *** the Fe/Si mass ratio above unity increased the amounts of detrimentalβ-Cu Fe platelets in the microstructure,deteriorating the tensile properties and hot tearing *** the mass ratio below unity increased the size and fraction of Si needles and micropores in the microstructure,also impairing the tensile properties and hot tearing *** investigation of hot-torn surfaces revealed that theβ-Cu Fe platelets disrupted the tear healing phenomenon by blocking interdendritic feeding channels,while theα-Fe intermetallics improved the hot tearing resistivity due to their compact morphology and high melting point.

关键词： aluminum–copper alloys castability fluidity hot tearing susceptibility

Probability calculation of rebars corrosion in reinforced concrete using css algorithms

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Journal of Central South University 2015年第8期22卷 3141-3150页

作者： Mohsen-Ali Shayanfar mohammad-Ali Barkhordari mohammad Ghanooni-Bagha The Centre of Excellence for Fundamental Studies in Structural Engineering Iran University of Science and TechnologyP.O.BOX: 16765-163 Narmak Tehran Iran

Reinforcement inside the concrete is protected from corrosion and its damages until several years after the construction. After corrosion initiation, the cross section of reinforcement begins to reduce and often load bearing of the reinforced concrete structure will be reduced significantly. Corrosion of reinforcements in concrete in polluted and contaminated areas can occur in two ways: chloride and carbonation. In this work, meta-heuristic approach of charged system search(CSS) is used to calculate corrosion occurrence probability due to chloride ions penetration. The model efficiency is verified by comparing the available examples in technical literature and results of Monte Carlo analysis. According to the analyses performed, using different probabilistic distributions regardless of probabilistic moments based on real distribution leads to diverse results. In addition, influence of each effective parameter in corrosion occurrence varies by changing other parameters.

关键词： reinforced concrete reliability index chloride diffusion carbonation charged system search (CSS) optimization

Experimental investigation of shock-buffet criteria on a pitching airfoil

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Chinese Journal of Aeronautics 2022年第7期35卷 179-191页

作者： Mehran MASDARI Aghil ZEINALZADEH mohammad Ali ABDI mohammad Reza SOLTANI Faculty of New Sciences and Technologies University of TehranTehran ***Iran Department of Aerospace Engineering Sharif University of TechnologyTehran 11365-11155Iran Department of Aeronautical and Astronomical Engineering University of WashingtonSeattleWAUSA

An experimental investigation of the shock-buffet phenomenon subject to unsteady pitching supercritical airfoil around its quarter chord has been conducted in a transonic wind *** model was equipped with pressure taps connected to the fast response *** were conducted at different free-stream Mach number from 0.61 *** principle goal of this investigation was to experimentally discuss the shock-buffet criterion over a SC(2)-0410 supercritical pitching related to the hysteresis loops of total drag and trailing edge pressure,the behaviour of the shock wave foot location,the pressure distribution over the upper surface,and by implementing the wavelet analysis of the normal *** ensure capturing the buffet phenomenon by utilizing these criteria,a pressure port has been drilled exactly at the trailing edge of the airfoil where its output was used to detect the buffet phenomenon for different *** representation of the flow using the shadow graph flow visualization technique for different test cases is further used to illustrate the unsteady shock wave motion.A comparative analysis of experimental measurements shows that the conducted criteria confirm each other when the buffet phenomenon occurs at the position of the oscillating cycle.

关键词： Airfoil Buffeting Experimental analysis Hysteresis loops Pitching motion Shock wave Wavelet analysis

Effect of Alkali and Silane Treatments on Mechanical and Fibre-matrix Bond Strength of Kenaf and Pineapple Leaf Fibres

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Journal of Bionic Engineering 2016年第3期13卷 426-435页

作者： mohammad Asim mohammad Jawaid Khalina Abdan Mohamad Ridzwan lshak Laboratory of Biocomposite Technology Institute of Tropieal Forestry and Forest Products (1NTR OP) Universiti Putra Malaysia Serdang 43400 Malaysia Department of Biological and Agricultural Engineering Faculty of Engineering Universiti Putra Malaysia Serdang 43400 Malaysia Department of Aerospace Engineering Universiti Putra Malaysia Serdang 43400 Malaysia

Natural fibres are very versatile materials, their properties vary with chemical composition and physical structure. The effects of alkali, silane and combined alkali and silane treatments on the mechanical （tensile）, morphological, and structural properties of Pine Apple Leave Fibres （PALF） and Kenaf Fibres （KF） were investigated with the aim to improve their com- patibility with polymer matrices. The effectiveness of the alkali and saline treatments in the removal of impurities from the fibre surfaces was confirmed by Scanning Electron Microscopy （SEM） and Fourier Transform Infrared spectrometry （FTIR） ob- servation. The morphological study of treated PALF and KF by SEM indicates that silane treated fibres have less impurities and lignin and hemicelluloses removed than those by other chemical treatments. Silane treated PALF and KF display better tensile strength than those of untreated, alkaline and NaOH-silane treated. Droplet test indicates that the lnterfacial Stress Strength （IFSS） of alkali and silane treated PALF and KF are enhanced whereas silane treated fibres display highest IFSS. It is assumed that fibre treatments will help to develop high performance KF and PALF reinforced polymer composites for industrial appli- cations.

关键词： pineapple leaves fibre kenaf fibre chemical treatment tensile properties structural properties droplet test