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Physiographic-Tectonic Zoning of Iran’s Sedimentary Basins

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Open Journal of Geology 2013年第3期3卷 169-177页

作者： mehran Arian Department of Geology Science and Research Branch Islamic Azad University Tehran Iran

Base on geological history evaluation using regional stratigraphy, sedimentary environments, magmatic activities, metamorphism and structural trend in Iran, physiographic-tectonic zoning map of Iran’s sedimentary basins has prepared. This map has prepared to point out the basement tectonics role in Iran. It contains twenty-four different provinces. Iran has composed from different plates: Arabian plate in south and west, Cimmerian manipulated in north and east, Eurasian plate in northeast margin. Cimmerian manipulated at least can be divided to the smaller part, East-Central Iran and North-Central Iran microcontinents. There are evidences for thick-skinned tectonics in the border zones of these plates and microcontinents, especially in Sanandaj-Sirjan overthrust belts that it formed by crustal stacking wedges. Also, Neoproterozoic-Phanerozoic Tectonic column in the Arabian, Cimmerian and Eurasian plates under Iran Country area have introduced.

关键词： Physiographic Tectonics Plate Iran Microcontinents Basin

A Novel Method Based on UNET for Bearing Fault Diagnosis

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Computers, Materials & Continua 2021年第10期69卷 393-408页

作者： Dileep Kumar Soother Imtiaz Hussain Kalwar Tanweer Hussain Bhawani Shankar Chowdhry Sanaullah mehran Ujjan Tayab Din Memon National Centre of Robotics and Automation HHCMS LabMehran University of Engineering&TechnologyJamshoro76020SindhPakistan Department of Electrical Engineering DHA SUFFA UniversityKarachiSindhPakistan Department of Electronic Engineering Mehran University of Engineering and TechnologyJamshoro76020SindhPakistan

Reliability of rotating machines is highly dependent on the smooth rolling of ***,it is very essential for reliable operation of rotating machines to monitor the working condition of bearings using suitable fault diagnosis and condition monitoring *** the recent past,Deep Learning(DL)has become applicable in condition monitoring of rotating machines owing to its *** paper proposes a novel bearing fault diagnosis method based on the processing and analysis of the vibration *** proposed method is the UNET model that is a recent development in DL *** model is applied to the 2D vibration images obtained by transforming normalized amplitudes of the time-series vibration data samples into the corresponding vibration *** UNET model performs pixel-level feature learning using the vibration images owing to its unique *** results demonstrate that the model can perform dense predictions without any loss of label information,generally caused by the sliding window labelling *** comparative analysis with other DL models confirmed the superiority of the UNET model which has achieved maximum accuracy of 98.91%and F1-Score of 99%.

关键词： Condition monitoring deep learning fault diagnosis rotating machines vibration

Rapid solidification and metastable phase formation during surface modifications of composite Al-Cr cathodes exposed to cathodic arc plasma

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Journal of Materials Science & Technology 2021年第35期94卷 147-163页

作者： mehran Golizadeh Francisca Mendez Martin Stefan Wurster Johann P.Mogeritsch Abdellah Kharicha Szilard Kolozsvári Christian Mitterer Robert Franz Department of Materials Science Montanuniversitat LeobenFranz Josef-Straβe 188700 LeobenAustria Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraβe 12.8700 LeobenAustria Department of Metallurgy Montanuniversitat LeobenFranz Josef-Straβe 188700 LeobenAustria Plansee Composite Materials GmbH Siebenbiirgerstraβe 2386983 Lechbruck am SeeCermany

A combination of both conventional and advanced high-resolution characterization techniques was applied to study the modified layers on the surface of three composite Al-Cr arc cathodes with identical nominal composition of Al-50 at.%Cr but varying powder grain *** results revealed that the modified layers consist mainly of metastable phases such as Cr solid solution,high temperature cubic Al8 Cr5,supersaturated Al solid solution,and icosahedral *** metastable phase formation indicates that high cooling rates were involved during the solidification of molten material produced in the arc craters during cathode spot *** average cooling rate was estimated to be 10^(6)K/s based on secondary dendrite arm spacing measurements and supporting phase-field based *** formation mechanisms of the modified layers are discussed based on the obtained results and the current literature.

关键词： Cathodic arc Rapid solidification Quasicrystal Arc crater Macroparticle Phase-field simulation

Synchronization of nanowire-based spin Hall nano-oscillators

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Chinese Physics B 2022年第7期31卷 549-553页

作者： Biao Jiang Wen-Jun Zhang mehran Khan Alam Shu-Yun Yu Guang-Bing Han Guo-Lei Liu Shi-Shen Yan Shi-Shou Kang School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Department of Physics and Electronic Science Weifang UniversityWeifang 261061China

The synchronization of the spin Hall nano-oscillator(SHNO)device driven by the pure spin current has been investigated with micromagnetic *** was found that the power spectra of nanowire-based SHNO devices can be synchronized by varying the current flowing in the heavy metal(HM)*** synchronized signals have relatively high power and narrow linewidth,favoring the potential *** also found that the synchronized spectra are strongly dependent on both the number and length of ***,a periodic modulation of power spectra can be obtained by introducing interfacial Dzyaloshinskii–Moriya interaction(iDMI).Our findings could enrich the current understanding of spin dynamics driven by the pure spin ***,it could help to design novel spintronic devices.

关键词： spin Hall nano-oscillators synchronization Dzyaloshinskii–Moriya interaction spin wave

CH_4 reforming with CO_2 for syngas production over La_2O_3 promoted Ni catalysts supported on mesoporous nanostructured γ-Al_2O_3

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Journal of Energy Chemistry 2014年第4期23卷 435-442页

作者： Narges Habibi mehran Rezaei Nasrollah Majidian Mahmood Anache Faculty of Engineering Tehran North Branch Islamic Azad UniversityTehran P.O.Box 166793 4783 Iran Catalyst and Advanced Materials Research Laboratory Chemical Engineering Department Faculty of Engineering University of KashanKashan P.O.Box 873175 1117 Iran Sarv Oil&Gas Industries Development Company Tehran P.O.Box 199367 3451 Iran

Nanostructured -y-A12O3 with high surface area and mesoporous structure was synthesized by sol-gel method and employed as catalyst support for nickel catalysts in methane reforming with carbon dioxide. The prepared samples were characterized by XRD, N2 adsorption-desorption, TPR, TPO, TPH, NH3-TPD and SEM techniques. The BET analysis showed a high surface area of 204 m2.g-1 and a narrow pore-size distribution centered at a diameter of 5.5 nm for catalyst support. The BET results revealed that addition of lanthanum oxide to aluminum oxide decreased the specific surface area. In addition, TPR results showed that addition of lanthanum oxide increased the reducibility of nickel catalyst. The catalytic evaluation results showed an increase in methane conversion with increasing lanthanum oxide to 3 mol% and further increase in lanthanum content decreased the catalytic activity. TPO analysis revealed that the coke deposition decreased with increasing lanthanum oxide to 3 mol%. SEM and TPH analyses confirmed the formation of whisker type carbon over the spent catalysts. Addition of steam and Oxide to drv reformin feed increased the methane conversion and led to carbon free ooeration in combined orocesses.

关键词： nanostructured γ-A12O3 nickel catalyst dry reforming lanthanum oxide

Investigation of the factors affecting the consistency of short-period traffic counts

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Journal of Modern Transportation 2017年第3期25卷 150-162页

作者： Solomon Yadessa Kenno Prasanta K.Sahu Babak mehran Satish Sharma Saskatchewan Ministry of Highways and Infrastructure Department of Civil Engineering Birla Institute of Technology and Science Pilani(BITS Pilani) Faculty of Engineering and Applied Science University of Regina

The main intent of this study is to investigate the accuracy of short-duration traffic counts conducted during winter months. The investigation is based on 11-year sample data collected using permanent traffic counters at various locations in Alberta, Canada. Four types of road sites： commuter, regional commuter, rural long-distance, and recreational sites are studied. The sample data consti- tute six different durations of counts （12-, 24-, 48-, 72-, 96-h, and 1 week） taken during summer and winter months. The coefficient of variation （CV） is used as the relative measure of deviation for counts of different dura- tions to measure the accuracy of short-period traffic counts. The study results indicate that 48-h count seems to be the most cost-effective counting interval during both summer and winter months. It is also found that the lowest values of CV result for counts taken at commuter sites, and the highest values are observed for recreational sites. Frequent changes in temperature and other weather events cause significant variation in traffic volume, which results in an increase in CV values for counts taken during winter months. The application of an adjustment factor to remove the effect of cold and snow from short-period counts is also included in this study. Introduced adjustment factors can reduce the values of CV for all counts taken during winter months. The findings of this study can lead highway agencies to improve the cost-effectiveness of their short- period traffic counting programs.

关键词： Short-period traffic counts Average annualdaily traffic - Design hourly volume

Designing user-centric transport strategies for urban road space redistribution

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Communications in Transportation Research 2023年第1期3卷 230-248页

作者： Manu Sasidharan mehran Eskandari Torbaghan Yasmin Fathy Christopher D.F.Rogers Nicole Metje Jennifer Schooling Department of Engineering University of CambridgeCambridgeCB21PZUK School of Engineering University of BirminghamBirminghamEdgbastonB152TTUK

Cities worldwide are geared to promote economic growth,improve accessibility,address environmental issues,and enhance the quality of ***,the processes that lead to the design of urban roads,particularly the space distribution,reflect the inequalities existing in the fabric of our *** often have shorter travel time and more space than passengers of other ***,the existing transport appraisal and planning tools that frame sustainable transport policies fall short of considering the dimension of social ***,our urban transport systems are essential areas for advancing sustainability through a transport justice-based approach to planning that can pivot the distribution of infrastructure investments over different social groups and transport *** study proposes such an approach by which such suitable urban transport strategies can be identified,co-created with users and appraised while considering the commuters’***,the interaction between the multidimensional characteristics of sustainability and the principles of transport justice are *** proposed approach is applied to London and *** results show that a transparent and holistic approach to integrating users within transport planning is an effective way to reflect diverse needs and local circumstances and thereby ensure a just transition to sustainable urban transport *** results from the case studies highlight a strong rationale for the centrality of justice in any urban transport planning and policy making efforts,particularly in the allocation of road space.

关键词： Urban transport Sustainability Road space allocation Cost-benefit analysis

Petrophysical Evaluation and the Effect of Shale Layers on Net Pay Zone Thickness in the Marun Oil Field, Iran

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Open Journal of Geology 2016年第8期6卷 763-773页

作者： Saeed Tajali mehran Arian Department of Geology Science and Research Branch Islamic Azad University Tehran Iran

The Marun oil field is situated on the eastern part of Zagros, Iran. Aghajari Formation is cropping out on the surface. The Asmari formation, the Bangestan and Khami Groups are the Main reservoirs in this field and Asmari formation is the most important reservoir. Dolomitic carbonates are dominant lithology in the study well. Increasing of shale Layers in different layers caused to decrease of brittle property and this condition had investigated by petrophysical evaluation. According to this research, near to 29 percent shale has mixed with sandstone rock units in the study well which is comparable with maximum porosity there. Because, sandstone layers have shown the best porosity (near to 26 percent) in the study well. Also, good rocks based on water saturation and porosity are situated in sandstone units and poor rocks have existed in the limestone-dolomites. Therefore, facies changes in the Asmari formation can explain the observed variations in reservoir quality in the study area.

关键词： Asmari Formation Marun Oil Field Petrophysical Evaluation Well Logging

Salt Tectonics in the Southern Iran

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International Journal of Geosciences 2016年第3期7卷 367-377页

作者： Azar Khodabakhshnezhad mehran Arian Department of Education One Territory of Baharestan Education Office Ministry of Education Tehran Iran Department of Geology Science and Research Branch Islamic Azad University Tehran Iran

Based on geographic distribution and geological setting of salt plugs in southern Iran, three salt diapiric provinces have been distinguished. These provinces include the Hormuz, Shiraz-Kazerun and Nyriz-Jahrum sub-basins. There are more than hundred salt plugs which they have been formed and developed in the southern margin of Iran. The salt structures that originated from Hormuz formation in these areas have been restricted and separated from each other for the first time in this paper. Salt diapirism of these provinces has been triggered earlier by Halokinesis in the Zagros and Persian Gulf basins, but it has affected later by tectonic forces, because orientation, shape and position of salt plugs have been followed from convergence regime (especially in the Zagros hinterland). In the other hand, based on our results from salt plugs in Persian Gulf foreland basin and the Zagros hinterland, Halokinesis triggers has been affected more than Halotectonic forces.

关键词： Salt Tectonics Zagros Persian Gulf Iran