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Crack Propagation in Pipelines Under Extreme Conditions of Near-Neutral PH SCC

Computers, Materials & Continua 2022年第12期73卷 5315-5329页

作者： Abdullah Alsit mohammad Alkhedher hasan Hamdan Mechanical Engineering Department College of EngineeringAbu Dhabi UniversityAbu Dhabi59911United Arab Emirates

Stress Corrosion Cracking(SCC)process through which cracks occur in a variety of susceptible materials is a result of a combination of residual or applied stresses and *** oil and gas field,buried pipeline steels are made of low-alloy steels with a ferritic-pearlitic structure,such as *** dilute solutions,these materials are prone to SCC *** Near-neutral simulated soil solution(NS4)solution is established to imitate SCC conditions and subsequently became the industry requirement for crack growth experiments in the majority of *** strainassisted active crack pathways are considered while modelling SCC growth as an oxide film rupture and anodic dissolution ***’s been hypothesized that increasing the strain concentration can help with dissolution at the filmfree crack *** research focuses on estimating the SCC crack growth rate under various environmental conditions in oil and gas pipelines using finite element *** simulation is carried out using the J-integral theory in the COMSOL Multiphysics *** are performed to model the crack growth rate(CGR)using slip anodic dissolution(film rupture)*** plastic strain gradient is required to compute the SCC CGR(da/dt).Because the plastic strain located at crack tip increases proportionally to the crack length as it propagates,the CGR increases as the stress intensity factor(SIF)*** crack growth rates increase when constant loads are applied and as the temperature rises,and elevating the cathodic potential has a minimal influence on the propagation rate of cracks but raises the material yield strength and imparts brittle behavior to it.

关键词： Stress corrosion cracking SCC oxide film rupture and anodic dissolution crack growth rate CGR J-integral stress intensity factor SIF

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Innovative Developments in HCI and Future Trends

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International Journal of Automation and computing 2017年第1期14卷 10-20页

作者： mohammad S.hasan Hongnian Yu Faculty of Computing Engineering and Sciences Staffordshire University Faculty of Science and Technology Bournemouth University

The recent developments in technology have made noteworthy positive impacts on the human-computer interaction （HCI）. It is now possible to interact with computers using voice commands, touchscreen, eye movement, hand gesture, etc. This paper compiles some of the innovative HCI progresses in various areas, e.g., specialised input/output devices, virtual or augmented reality, wearable technology, etc. It also identifies some future research directions.

关键词： Human-computer interaction (HCI) virtual reality augmented reality haptic feedback controller smart-home.

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Artinianness and Attached Primes of Formal Local Cohomology Modules

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Algebra Colloquium 2014年第2期21卷 307-316页

作者： mohammad hasan Bijan-Zadeh Shahram Rezaei Department of Mathematics Faculty of Science Payame Noor University Iran

Let a be an ideal of a local ring （R, m） and A4 a finitely generated R-modu｜e. In this paper we study the Artinianness properties of formal local cohomology modules and we obtain the lower and upper bounds for Artinianness of formal local cohomology modules. Additionally, we determine the set AttR a dim M（M） and we show that the set of all non-isomorphic formal local cohomology modules a dim M（M） is finite.

关键词： Artinianness properties attached primes formal local cohomology local co-homology

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Dynamic observer-based controllers for linear uncertain systems

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控制理论与应用（英文版） 2013年第2期11卷 193-199页

作者： Arash GOLABI mohammad Taghi Hamidi BEHESHTI mohammad hasan ASEMANI Department of Electrical and Computer Engineering Tarbiat Modares University

This paper addresses robust controller design for uncertain linear systems via a dynamic observer-based controller. A dynamic observer is an alternative structure for a classical observer which can be regarded as a general form of a usual observer and has additional degrees of freedom in the observer structure. Using this new observer structure, a new observer-based controller for linear systems is proposed. Some strict linear matrix inequalities （LMIs） have been given to find the dynamic observer parameters and controller gain. It is shown that dynamic observer can be used effectively for tackling the drawbacks of the classical observer-based robust controller design methods. As an advantage, LMIs are derived even in the presence of uncertainties in system, input and output matrices simultaneously, whereas by using the traditional observer, bilinear matrix inequalities （BMIs） are given in the presence of such uncertainties. Moreover, the proposed LMIs do not imply the equality constraint. Simulation results are used to illustrate the effectiveness of the proposed design technique.

关键词： Dynamic observer Uncertain systems Linear matrix inequality (LMI) Robust control Output feedbackcontrol

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Optimal design of a scaled-up PRO system using swarm intelligence approach

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Science China(Information Sciences) 2021年第12期64卷 175-188页

作者： Yingxue CHEN Zhongke SHI Bin XU mohammad hasan SHAHEED School of Power and Energy Northwestern Ploytechnical University School of Automatic Northwestern Polytechnical University School of Engineering and Materials Science Queen Mary University of London

In this study, the pressure-retarded osmosis(PRO) process is optimized using Harris hawks optimization(HHO)-based maximum power point tracking(MPPT) technology. To make the practical implementation of salinity-gradient-based energy harvesting using PRO feasible, MPPT is envisaged to play a substantial role. Therefore, this study focuses on the development of a novel MPPT controller using swarm intelligence. The HHO algorithm is the latest approach that mimics the unique chasing strategy of Harris hawks in nature. To test the cost effectiveness of the proposed method, two case studies with various operational scenarios are presented. Compared with the performance of selected well-known and recent approaches, such as perturb & observe, incremental mass resistance, and whale optimization algorithm techniques, that of the proposed metaheuristic-based MPPT technique is found to be highly *** also show that the proposed algorithm can overcome other methods’ limitations, such as low tracking efficiency; low robustness when encountered in various operational conditions, including temperature and salinity; and steady-state oscillations. Furthermore, the proposed MPPT strategy is suitable for use in other fields of renewable energy harvesting.

关键词： maximum power point tracking (MPPT) swarm intelligence metaheuristic algorithms pressure-retarded osmosis (PRO) Harris hawks optimization (HHO)

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Numerical simulation of high voltage electric pulse comminution of phosphate ore

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International Journal of Mining Science and Technology 2015年第3期25卷 473-478页

作者： Razavian Seyed mohammad Rezai Bahram Irannajad Mehdi Ravanji mohammad hasan Department of Mining and Metallurgical Engineering Amirkabir University of Technology Department of Electrical Engineering Sharif University of Technology

Numerical simulation of the electrical field distribution helps in-depth understanding of the mechanisms behind the responses and the benefits of the high voltage pulse comminution. The COMSOL Multiphysics package was used to numerically simulate the effect of ore compositions in this study. Regarding phosphate ore particles shape and composition, the effects of mineral composition, particle size, particle shape and electrodes distance were investigated on the electrical field intensity and distribution. The results show that the induced electrical field is significantly dependent on the electrical properties of minerals,the feed particle size and the location of conductive minerals in ores. The angle of material contact surface with the discharge electrode is also an important factor in the intensity of electrical field. Moreover,it is found that the specific liberation effect at the disintegration of phosphate ore by electrical pulses is due to the locality of the electrical field at the interface of mineral components of the phosphate ore aggregates with different permittivities. However, the intensity of the electrical field increases with sharpening the contact angle. Besides, the electrical discharge in the samples is converted to the electrohydraulic discharge across the surrounding water by changing the distance between the discharge electrode and sample surface.

关键词： Numerical simulation High voltage electric pulse Electrical comminution Phosphate ore

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Molybdenite alkali fusion and leaching:reactions and mechanism

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International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 127-131页

作者： Reza Ebrahimi-Kahrizsangi mohammad hasan Abbasi Ali Saidi Department of Materials Engineering Islamic Azad University Department of Materials Engineering Isfahan University of Technology

The production of MoO3 from Sarcheshmeh molybdenite concentrate via a pyro-hydrometallurgical process was *** molybdenite concentrate and sodium carbonate were premixed and fused under air *** the fused products were leached in water and the dissolved molybdenum was recovered as ammonium *** ammonium molybdate was then calcined to produce mo-lybdic *** the fusion stage,the effect of the mass ratio of carbonate to sulfide on the reaction products and the solubility of the products was *** results show that during the fusion,sodium molybdate and sodium sulfate are the final reaction products and sodium sulfide is detected as an intermediate reaction *** melting at 850℃with 5wt%excess carbonate,the maximum solubility of the products is *** molybdenum is recovered from the solutions as ammonium molybdate.

关键词： molybdenite alkali fusion leaching sodium molybdate molybdic oxide

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Effect of WOx promoter on Pt/ZrO2-HMS catalysts for n-heptane isomerization： Catalytic performance and kinetics study

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Chinese Chemical Letters 2017年第3期28卷 546-552页

作者： Nastaran Parsafard mohammad hasan Peyrovi Nasibeh Parsafard Faculty of Chemistry and Petroleum Sciences Department of Petroleum Chemistry and Catalysis University of Shahid Beheshti Tehran P.O. Box *** Iran Kosor-University of Bojnord Department of Applied Chemistry North Khoroson Iron

Platinated W/Zr mixed oxides supported on mesoporous silica with various amounts of Si/Zr, namely PtWO_3/ZrO_2（[76_TD$IF]x）-HMS, were prepared and studied for n-heptane isomerization reaction at 200–350 C. The various methods such as XRD, XRF, FT-IR, UV–vis DRS, NH_3-TPD, H_2 chemisorption, nitrogen adsorption–desorption, Py-IR, SEM and TGA techniques were used for characterization of these materials. Kinetics of n-heptane isomerization was also investigated under various hydrogen. n-Heptane pressures and the influence of reaction conditions on catalytic performance were studied. The ideal catalytic performance was observed on HMS with 0.6%Pt/12%WO_3/ZrO_2 and Si/Zr = 10.

关键词： W/Zr mixed oxides Mesoporous silica n-Heptane isomerization Kinetics Catalytic performance

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Characterization of NbSi_2–Al_2O_3 nanocomposite coatings prepared with plasma spraying mechanically alloyed powders

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International Journal of Minerals,Metallurgy and Materials 2015年第7期22卷 748-754页

作者： Zohreh Yazdani Fathallah Karimzadeh mohammad-hasan Abbasi Abbas Amini Department of Materials Engineering Isfahan University of Technology

The present study characterized NbSi2-Al2O3 nanocomposite powders plasma-sprayed on Ti-6Al-4Vsubstrates. The powders were agglomerated to obtain suitable particle sizes for spraying. The agglomerated powders were then plasma-sprayed using atmospheric plasma spraying. The structural transformations of the powders along with the morphological and mechanical changes of the coatings were examined by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, and hard- ness testing. The results showed that after plasma spraying, the grain size increased, and the lattice strain decreased. However, the grain size of this compound after spraying was still in the nanometer range. The coating was uniform and exhibited good adhesion to the substrate. The microhardness and fracture toughness of the nanocomposite coating were higher than those of a nanostructured NbSi2 coating.

关键词： nanocomposites coatings plasma spraying mechanical alloying

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Tea beverage in chemoprevention and chemotherapy of prostate cancer

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Acta Pharmacologica Sinica 2007年第9期28卷 1392-1408页

作者： Imtiaz A SIDDIQUI mohammad SALEEM Vaqar M ADHAMI mohammad ASIM hasan MUKHTAR Department of Dermatology University of WisconsinMedical Sciences CenterRoom B-25 1300 University AvenueMadisonWisconsin 53706USA

Prostate cancer (PCa) is the most frequently diagnosed malignancy and the sec-ond leading cause of cancer-related deaths in American males with similar trendsin many western *** existing treatment approaches and surgical inter-vention have not been able to effectively cope with this dreaded *** reasons,it is necessary to intensify our efforts for a better understanding ofthe disease process and for the development of novel approaches for its preven-tion and *** on considerable evidence from in vivo and in vitro dataand epidemiological studies,in recent years the beverage tea has gained consid-erable attention for reducing the risk of several *** of the cancerpreventive effects of tea,especially green tea appear to be mediated by the polyphe-nols present *** evidence suggests that the incidence andoccurrence of PCa is lower in populations that consume tea *** evi-dence suggests that tea polyphenols could be extrapolated to optimize theirchemopreventive properties against *** represents an excellent candidatedisease for chemoprevention because it is typically diagnosed in men over 50years of age and therefore,even a modest delay in neoplastic development achievedthrough pharmacological or nutritional intervention could result in a substantialreduction in the incidence of clinically detectable *** this review weaddress the issue of possible use of tea,especially green tea,for the prevention aswell as treatment of PCa.

关键词： Green tea (-)epigallocatechin-3-gallate (-) epicatechin apoptosis androgen receptor PSA tumor xenograft epidemiology clinical studies

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