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An investigation into the effects of lime on compressive and shear strength characteristics of fiber-reinforced clays

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第4期13卷 885-898页

作者： Mahmood reza abdi Abbas Ghalandarzadeh Leila Shafiei Chafi Faculty of Civil Engineering K.N.Toosi University of TechnologyTehranIran School of Engineering Tehran UniversityTehranIran

To meet the ever-increasing construction demands around the world during recent years,reinforcement and stabilization methods have been widely used by geotechnical engineers to improve the performances and behavior of fine-grained *** lime stabilization increases the compressive strength of soils,it reduces the soil ductility at the same *** research shows that random fiber inclusion modifies the brittleness of *** the current research,the effects of lime and polypropylene(PP)fiber additions on such characteristics as compressive and shear strengths,failure strain,secant modulus of elasticity(E50)and shear strength parameters of mixtures were *** was treated with 1%,3% and 5% lime by dry weight of soil and reinforced with 0.1% monovalent PP fibers with the length of 6 *** were prepared at optimum conditions and cured at 35℃ for 1 d,7 d and 28 d at 90% relative humidity and subsequently subjected to uniaxial and triaxial compression tests(UCT and TCT)under cell pressures of 25 kPa,50 kPa and 100 *** showed that inclusion of random PP fibers to clay-lime mixtures increases both compressive and shear strengths as well as the *** content and curing period were found to be the most influential *** electron microscopy(SEM)analysis showed that lime addition and the formation of cementitious compounds bind soil particles and increase soil/fiber interactions at interface,leading to enhanced shear *** more ductile the stabilized and reinforced composition,the less the cracks in roads and waste landfill covers.

关键词： Kaolinite Lime Polypropylene(PP) Fiber-reinforced clay Triaxial compression test(TCT) Uniaxial compression test(UCT) Scanning electron microscopy(SEM)

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Modeling and Analysis of Mechanization Projects of Wheat Production by GERT Networks

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Agricultural Sciences in China 2010年第7期9卷 1078-1083页

作者： reza abdi Hamid reza Ghasemzadeh Shamsollah Abdollahpour Majid Sabzeparvar Adel Dabbag Mohamadi Nasab Faculty of Agriculture University of Tabriz Faculty of Industrial University of Science and Industry(Iran)

In crop production systems,all operations such as seed bed preparation,etc.,must be accomplished on time,if yield reduction and low quality product are to be *** all operations in mechanized cropping projects require precise scheduling,planning and *** basic approach in all scheduling techniques is to form a network of activities and events relationships that graphically portrays the sequential relations between the tasks in a *** a network would as a powerful tool available a farm manager to plan,schedule,monitor and control a *** GERT（Graphical Evaluation and Review Technique） networks have most of advantages associated with networks and available system analyst in exact evaluation of certain types of networks,in this research it was used and mechanized wheat production system was simulated,modeled and *** activities,events and path were *** showed that the network model was able to answer any statistic questions concerning with the *** models,particularly GERT networks are increasingly powerful tool for modeling,scheduling,planning,controlling,and analyzing of agricultural mechanization projects.

关键词： GERT networks mechanization project scheduling wheat

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Impacts of oak deforestation and rainfed cultivation on soil redistribution processes across hillslopes using ^(137)Cs techniques

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Forest Ecosystems 2021年第3期8卷 425-438页

作者： Shamsollah Ayoubi Nafiseh Sadeghi Farideh Abbaszadeh Afshar Mohammad reza abdi Mojtaba Zeraatpisheh Jesus Rodrigo-Comino Department of Soil Science College of AgricultureIsfahan University of TechnologyIsfahan 84156-83111Iran Department of Soil Science College of AgricultureUniversity of JiroftKermanIran Department of Physics Faculty of ScienceUniversity of IsfahanIsfahan 81747-73441Iran Henan Key Laboratory of Earth System Observation and Modeling Henan UniversityKaifeng 475004China College of Environment and Planning Henan UniversityKaifeng 475004China Department of Physical Geography University of TrierTrierGermany Soil Erosion and Degradation Research Group Department of GeographyUniversitat de ValènciaValenciaSpain

Background:As one of the main components of land-use change,deforestation is considered the greatest threat to global environmental diversity with possible irreversible environmental ***,one example could be the impacts of land-use changes from oak forests into agricultural ecosystems,which may have detrimental impacts on soil mobilization across ***,to date,scarce studies are assessing these impacts at different slope positions and soil depths,shedding light on key geomorphological ***:In this research,the Caesium-137(^(137)Cs)technique was applied to evaluate soil redistribution and soil erosion rates due to the effects of these above-mentioned land-use *** achieve this goal,we select a representative area in the Lordegan district,central Iran.^(137)Cs depth distribution profiles were established in four different hillslope positions after converting natural oak forests to rainfed *** each hillslope,soil samples from three depths(0–10,10–20,and 20–50 cm)and in four different slope positions(summit,shoulder,backslope,and footslope)were taken in three transects of about 20m away from each *** activity of ^(137)Cs was determined in all the soil samples(72 soil samples)by a gamma *** addition,some physicochemical properties and the magnetic susceptibility(MS)of soil samples were ***:Erosion rates reached 51.1 t·ha^(−1)·yr^(−1) in rainfed farming,whereas in the natural forest,the erosion rate was 9.3 t·ha^(−1)·yr^(−1).Magnetic susceptibility was considerably lower in the cultivated land(χhf=43.5×10^(−8)m^(3)·kg^(−1))than in the natural forest(χhf=55.1×10^(−8)m^(3)·kg^(−1)).The lower soil erosion rate in the natural forest land indicated significantly higher MS in all landform positions except at the summit one,compared to that in the rainfed farming *** shoulder and summit positions were the most erodible hillslope positions in the natural forest and rainfed farming,res

关键词： Land-use change Soil redistribution Topographical changes Radionuclide Rainfed farming Deforestation

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Evaluation of wear and corrosion resistance of pure Mg wire produced by friction stir extrusion

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Transactions of Nonferrous Metals Society of China 2015年第6期25卷 1847-1855页

作者： Mohammad SHARIFZADEH Mohammad ali ANSARI Morteza NARVAN reza abdi BEHNAGH Alireza ARAEE Mohammad Kazem BESHARATI GIVI School of Mechanical Engineering College of EngineeringUniversity of Tehran Faculty of Mechanical engineering Urmia University of Technology

A solid-state process--friction stir extrusion （FSE） was applied to produce wires from Mg chips. The FSE process was performed using tool rotational speed of 150, 250 and 355 r/min at a constant plunge rate of 20 mm/min. The microstructural evolution, tribological behavior and corrosion resistance of the reference specimen and the friction stir extruded specimens were investigated. Microstructural characteristics of the specimens were investigated by optical microscopy （OM） and scanning electron microscopy （SEM）. The evaluations of mechanical properties include microhardness and dry sliding wear test. The corrosion resistance of the extruded specimens was characterized by potentiodynamic polarization test. The results show that the extruded specimens possess good surface quality and the process is beneficial for the improvement of hardness and wear resistance of the first machined chips. The produced wires are also found to have adequate corrosion resistance. These results demonstrate that FSE is an effective strategy for converting the machined Mg chips into the usable wires.

关键词： friction stir extrusion Mg wire friction wear hardness corrosion

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INAA to Determine Trace Element Concentrations in the Hair of Street Children of Isfahan City, Iran

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World Journal of Nuclear Science and Technology 2013年第4期3卷 117-122页

作者： Khadijeh rezaee Ebrahim Saraee Mohammad reza abdi Mohammad Mehdi Gharipour Nayereh Soltani Department of Nuclear Engineering Faculty of Advance Sciences and Technologies University of Isfahan Isfahan Iran Department of Physics Faculty of Science University of Isfahan Isfahan Iran Departments of Physics Universiti Putra Malaysia UPM Serdang Selangor Malaysia Safahan Institute of Higher Education Isfahan Iran

This study aimed to assess trace element concentrations in the hair of street children. Nutritional status was assessed by 24 hours’ dietary recall and anthropometric measurements. Data analysis found that Br, Sc, Sm and Ti concentrations show a normal distribution, and there is no significant difference between street children and control group. However, in the street children’s hair, the levels of Au, U, V are decreased and the levels of Co, La, Sb, Th are increased compared to the control group.

关键词： Hair INAA Isfahan Street Children Trace Elements

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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

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Reduced-order functional observers with application to partial state estimation of linear systems with input-delays

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Journal of Control and Decision 2015年第4期2卷 233-256页

作者： reza Mohajerpoor Hamid abdi Saeid Nahavandi Centre for Intelligent Systems Research(CISR) Deakin UniversityWaurn PondsAustralia

Reduced-order multi-functional observer design for multi-input multi-output linear timeinvariant(LTI)systems with constant delayed-inputs is *** research is useful in the input estimation of LTI systems with actuator delay,as well as system monitoring and fault detection of these *** approaches for designing an asymptotically stable functional observer for the system are proposed:delay-dependent and *** delay-dependent observer is infinite-dimensional,while the delay-free structure is ***,since the delay-free observer does not require any information on the time delay,it is more practical in real ***,the delay-dependent observer contains less restrictive assumptions and covers more variety of *** proposed observer design schemes are novel,simple to implement,and have improved numerical features compared to some of the other available approaches to design(unknown-input)functional *** addition,the proposed observers usually possess lower order than ordinary Luenberger observers,and the design schemes do not need the observability or detectability requirements of the *** necessary and sufficient conditions of the existence of an asymptotic observer in each scenario are *** extensions of the proposed observers to systemswith multiple delayed-inputs are also *** numerical examples and simulation results are employed to support our theories.

关键词： functional observer unknown-input observer time delay systems functional observability unknown-input functional observability

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Rare earth elements distribution in marine sediments of Malaysia coasts

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Journal of Rare Earths 2009年第6期27卷 1066-1071页

作者： rezaee Ebrahim Saraee Khadijeh Saion B.Elias Abdul Khalik Wood abdi Mohammad reza Universiti Putra Malaysia Physics Department Instrumental Technology Division Malaysian Institute for Nuclear Technology Research(MINT) Department of physics Faculty of ScienceUniversity of Isfahan

In the east coast Peninsular Malaysia region,sediments are transported by several rivers from the east Malaysia into the South China Sea *** the vicinity of the five river estuaries core sediments were collected in order to investigate rare earth elements(REEs) *** sediments were divided into strata of between 2 to 4 cm intervals and prepared for analyzing by *** concentrations of 54.3 μg/gr at 24–26 cm in EC4 increased to 114.1 μg/gr at 20–22 cm in *** measured concentration of ...

关键词： enrichment factor rare earth elements marine sediments South China Sea shale average

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Relationship between Temperaments of Medicinal Plants and Their Major Chemical Compounds

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Journal of Traditional Chinese Medicine 2011年第1期31卷 27-31页

作者： Mohammad reza Shams Ardekani Roja Rahimi Behjat Javadi Leila abdi Mahnaz Khanavi Department of Traditional Pharmacy Faculty of Traditional Iranian Medicine Tehran University of Medical Sciences Department of Pharmacognosy Faculty of Pharmacy Tehran University of Medical Sciences

Objective: To determine any relationship between temperaments of medicinal plants referred to traditional Iranian manuscripts and their major chemical compounds. Methods: Plants used in traditional Iranian medicine were categorized based on their major chemical compounds including alkaloids, phenolic compounds, and essential oils. Their temperaments were extracted from traditional herbal pharmacopeias of Iran. The possible relationship between major chemical compounds and temperaments of each group were evaluated. Results: Plants containing phenolic compounds as their major constituents are hot and dry temperaments except those contain tannins with cold and dry temperaments. Plants containing essential oils have hot and dry temperaments except those whose major essential oils with alcoholic structure which have cold and dry temperaments. Alkaloid-containing plants have cold and dry or hot and dry temperaments based on their alkaloidal structures. Conclusions: There is a close relationship between major chemical compounds of medicinal plants and their temperaments mentioned in traditional Iranian manuscripts.

关键词： traditional Iranian medicine " temperament " alkaloids " phenolic compounds " volatile oils

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Exogenous Endophthalmitis Due to Illicit Drug Injection in an I.V. Drug User

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Open Journal of Ophthalmology 2015年第4期5卷 155-157页

作者： Seyed Ali Tabatabaei Mohammad Soleimani Mohammad reza Mansouri Mohammad Ebrahimi Parisa abdi Mohammad Riazi Esfahani Eye Research Center Farabi Eye Hospital Tehran University of Medical Sciences Iran

Background: Drug abuse could cause complications;infection and overdose are the most prevalent of them. Unreliable history of addicted patients also makes the diagnosis difficult and leads to delayed treatment and poor prognosis. Early recognition and prompt treatment are required to minimize the destructive damage. To our knowledge, there is not any previous report of bilateral eye injection among drug abusers, causing traumatic endophthalmitis in the English literature and our report helps ophthalmologists to think about rare sources of endophthalmitis. Aim: The aim is to emphasize the importance of considering exogenous endophthalmitis in I.V. drug users who abuse drugs. Methods: A 40-year-old I.V. drug user man was referred complaining a history of the pain, redness and impaired vision of both eyes from three days ago. Perilimbal injection and anterior chamber cellular reaction were present in both eyes. Both corneas were hazy;corneal edema, abscess, sealed corneal lacerations and dull red reflex were visible in both eyes. Results: After an ultrasonography based on the suspicion of endophthalmitis, anterior chamber and vitreous aspiration and intravitreal injection of vancomycin 1 mg and ceftazidime 2.25 mg were performed. The right eye rapidly deteriorated and was eviscerated two days later and the left eye had a good response to medications. Conclusion: This report illustrates that the orbit can be a potential site of drug injection and endophthalmitis should be considered in individuals who abuse drugs.

关键词： Endophthalmitis IV Drug User Addiction Trauma

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