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Cutting-Edge Space Exploration Technology Maturity Level Facilitation with Support of Space Debris Removal Missions

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Journal of Beijing Institute of Technology 2018年第4期27卷 477-484页

作者： hamed Ahmadloo Jingrui Zhang School of Aerospace Engineering Beijing Institute of Technology

Considering current space debris situation in outer space environment,different methods for debris removal missions are *** addition,advanced technologies are needed to be demonstrated for future human space exploration *** main issue regarding to these missions is high mission cost for both debris removal missions and space environmental tests to achieve high maturity level for new space-usable ***,these missions are unavoidable for future of human space activities,a solution which can tackle these challenges is *** paper will address to an idea which has the possibility to give a solution for facilitating technology readiness level(TRL)maturity tests by debris removal mission platform consideration.

关键词： space debris removal missions technology demonstrator missions technology readiness level drag augmentation methods

Inverted polymer solar cells with employing of electrochemical-anodizing synthesized TiO_2 nanotubes

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Chinese Physics B 2016年第4期25卷 320-324页

作者： Mehdi Ahmadi Sajjad Rashidi Dafeh hamed Fatehy Department of Physics Faculty of Science Vali-e-Asr University of Rafsanjan

An inverted structure of polymer solar cells based on Poly（3-hexylthiophene）（P3HT）：[6-6] Phenyl-（6） butyric acid methyl ester （PCBM） with using thin films of TiO2 nanotubes and nanoparticles as an efficient cathode buffer layer is developed. A total of three cells employing TiO2 thin films with different thickness values are fabricated. Two cells use layers of TiO2 nanotubes prepared via self-organized electrochemical-anodizing leading to thickness values of 203 and 423.7 nm, while the other cell uses only a simple sol-gel synthesized TiO2 thin film of nanoparticles with a thickness of 100 nm as electron transport layer. Experimental results demonstrate that TiO2 nanotubes with these thickness values are inefficient as the power conversion efficiency of the cell using 100-nm TiO2 thin film is 1.55%, which is more than the best power conversion efficiency of other cells. This can be a result of the weakness of the electrochemical anodizing method to grow nanotubes with lower thickness values. In fact as the TiO2 nanotubes grow in length the series resistance （Rs） between the active polymer layer and electron transport layer increases, meanwhile the fill factor of cells falls dramatically which finally downgrades the power conversion efficiency of the cells as the fill factor falls.

关键词： inverted polymer solar cells TiO2 nanotubes electrochemical-anodizing doctor blading

Effect of Essential Oil of Zhumeria majdae on Morphine Tolerance and Dependence in Mice

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Chinese Journal of Integrative Medicine 2020年第9期26卷 683-687页

作者： Zahra Ehtemami hamed Shafaroodi Jinous Asgarpanah Department of Pharmacognosy Faculty of Pharmacy and Pharmaceutical SciencesTehran Medical SciencesIslamic Azad UniversityTehranIran Department of Pharmacology School of MedicineTehran University of Medical SciencesTehranIran

Objective:To evaluate the effects of Zhumeria majdae essential oil(ZMEO)on morphine dependence and tolerance in ***:ZMEO(10,20,and 40 mg/kg)and clonidine(0.1 mg/kg)as the positive control were injected intraperitoneally(i.p.).The effect of ZMEO and clonidine on the dependence were evaluated by counting the number of jumps induced by naloxone(5 mg/kg)while the tolerance was evaluated by the tail-flick ***:ZMEO at the dose of 10 mg/kg during the development period led to a significant inhibition of morphine tolerance(P<0.01),while it led to reduced morphine dependence with the doses of 20 and 40 mg/*** at two dose levels of 20 and 40 mg/kg indicated significant antinociceptive activity(P<0.01),and significantly reduced the withdrawal signs(number of jumps)of mice(P<0.01).Conclusions:ZMEO had significant effects on morphine tolerance and *** linalool rich essential oil of Zmajdae plays a major role in the reduction of tolerance and dependence induced by morphine.

关键词： Zhumeria majdae morphine dependence tolerance

Investigating short-term and long-term binder performance of high-RAP mixtures containing waste cooking oil

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第4期6卷 396-406页

作者： hamed Majidifard Nader Tabatabaee William Buttlar Department of Civil and Environmental Engineering University of MissouriColumbiaMO 65211USA Department of Civil Engineering Sharif University of TechnologyTehranIran

The environmental and economic benefits of recycling asphalt pavements have received much attention in recent years. Because of the increase in the cost of raw materials and energy carriers, the reuse of large portions of reclaimed asphalt pavement(RAP) is critical in reducing both the cost and environmental footprint of asphalt pavements. High-RAP mixtures are more prone to low temperature cracking and poor mixture workability because of the higher stiffness of RAP binder. Recycling agents are one of the additives which are used to improve these deficiencies. However, there is some ambiguity about the optimum content of recycling agent to assure proper performance of recycled asphalt pavement during its service life. The current study used 60% and 100% fractionated RAP with waste cooking oil as a recycling agent and crumb rubber to alleviate the aforementioned problems. Laboratory evaluation showed that increasing the amount of recycling agent in the high-RAP mixtures improved their workability and low temperature performance while decreasing moisture damage and rutting resistance. The long-term susceptibility to aging of recycled binder with the organically-based recycling agent was also investigated. A procedure to obtain the optimum percentage of recycling agent was devised to strike a balance between the performance characteristics of mixtures with a high-RAP content.

关键词： Asphalt Recycling RAP Cracking Recycling agent Rejuvenator

Nanofillers modification of Epocast 50-A1/946 epoxy for bonded joints

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Chinese Journal of Aeronautics 2014年第5期27卷 1288-1300页

作者： U.A.Khashaba A.A.Aljinaidi M.A.hamed Department of Mechanical Engineering Faculty of Engineering King Abdulaziz University

Epocast 50-A1/946 epoxy was primarily developed for joining and repairing of composite aircraft structural components. The objective of the present work is to modify the Epocast epoxy resin by different nanofillers infusion. The used nanofillers include multi-walled carbon nanotubes（MWCNTs）, SiC and Al2O3 nanoparticles. The nanofillers with different weight percentages are ultrasonically dispersed in the epoxy resin. The sonication time and amplitude for MWCNTs are reduced compared to Al2O3 and SiC nanoparticles to avoid the damage of MWCNTs during sonication processes. The fabricated neat epoxy and twelve nanocomposite panels were characterized via standard tension and in-plane shear tests. The experimental results show that the nanocomposites materials with 0.5wt% MWCNTs, 1.5wt% SiC and 1.5wt% Al2O3 nanoparticles have the highest improvement in the tensile properties compared to the other nanofiller loading *** improvements in the shear properties of these nanocomposite materials were respectively equal to 5.5%, 4.9%, and 6.3% for shear strengths, and 10.3%, 16.0%, and 8.1% for shear moduli. The optimum nanofiller loading percentages will be used in the following papers concerning their effect on the bonded joints/repairs of carbon fiber reinforced composites.

关键词： Iosipescu shear tests Nanocomposites Optimum nanofiller weight percentage Scanning electron microscopic Tension tests Ultrasonic

Rapid synthesis of MoSi_2-Si_3N_4 nanocomposite via reaction milling of Si and Mo powder mixture

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International Journal of Minerals,Metallurgy and Materials 2013年第11期20卷 1107-1114页

作者： Majid Abdellahi Alireza Amereh hamed Bahmanpou Behzad Sharafati Department of Materials Engineering Islamic Azad UniversityNajafabad Branch Department of Materials Engineering Islamic Azad UniversitySaveh Branch Department of Chemical Engineering and Materials Science University of California

The nanocomposite of MoSi2-SiaN4 （molybdenum disilicide-silicon nitride） was synthesized by reaction milling of the Mo and Si powder mixture. Changing the processing parameters led to the formation of different products such as a- and B-MoSi2, SiaN4, Mo2N, and M05Si3 at various milling times. A thermodynamic appraisal showed that the milling of Moa2Siss powder mixture was associated with highly exothermic mechanically induced self-sustaining reaction （MSR） between Mo and Si. The MSR took place around 5 h of milling led to the formation of a-MoSi2 and the reaction between Si and N2 to produce Si3N4 under a nitrogen pressure of 1 MPa. By increasing the nitrogen pressure to 5 MPa, more heat is released, resulting in the dissociation of Si3N4 and the transformation of a-MoSi2 to β-MoSi2. Heat treatment was also performed on the milled samples and led to the formation of Mo2N and the transformation of a-MoSi2 to β-MoSi2 at the milling times of 10 and 40 h, respectively.

关键词： nanocomposites reaction milling molybdenum disilicide silicon nitride powders

Semi entropy of uncertain random variables and its application to portfolio selection

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Applied Mathematics(A Journal of Chinese Universities) 2022年第3期37卷 383-395页

作者： GAO Jin-wu hamed Ahmadzade Mehran Farahikia School of Economics Ocean University of ChinaQingdao 266100China Department of Mathematical Sciences University of Sistan and BaluchestanZahedanIran Department of Statistics Payame Noor University19395-4697 TehranIran Ayandeh bank No.1Ahmad Ghasir(Bokharest)StArgentina SqTehranIran

Semi entropy is a measure to characterize the indeterminacy of the uncertain random variable considering the values of the uncertain random variable which are lower than the *** important roles of semi entropy in finance,this paper presents the concept of semi entropy for uncertain random *** order to compute semi entropy for uncertain random variables,Monte-Carlo approach is *** an application of semi entropy,portfolio selection problems are optimized based on mean-semi entropy mode.

关键词： chance theory uncertain random variable semi entropy portfolio selection Monte-Carlo simulation

Effectiveness of two conventional methods for seismic retrofit of steel and RC moment resisting frames based on damage control criteria

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Earthquake Engineering and Engineering Vibration 2017年第3期16卷 537-555页

作者： Seyed Bahram Beheshti Aval hamed Sadegh Kouhestani Lida Mottaghi Faculty of Civil Engineering K. N. Toosi University of Technology Tehran 1ran Faculty of Technical and Engineering Science & Culture University Tehran 1ran

This study investigates the efficiency of two types of rehabilitation methods based on economic justification that can lead to logical decision making between the retrofitting schemes. Among various rehabilitation methods, concentric chevron bracing（CCB） and cylindrical friction damper（CFD） were selected. The performance assessment procedure of the frames is divided into two distinct phases. First, the limit state probabilities of the structures before and after rehabilitation are investigated. In the second phase, the seismic risk of structures in terms of life safety and financial losses（decision variables） using the recently published FEMA P58 methodology is evaluated. The results show that the proposed retrofitting methods improve the serviceability and life safety performance levels of steel and RC structures at different rates when subjected to earthquake loads. Moreover, these procedures reveal that financial losses are greatly decreased, and were more tangible by the application of CFD rather than using CCB. Although using both retrofitting methods reduced damage state probabilities, incorporation of a site-specific seismic hazard curve to evaluate mean annual occurrence frequency at the collapse prevention limit state caused unexpected results to be obtained. Contrary to CFD, the collapse probability of the structures retrofitted with CCB increased when compared with the primary structures.

关键词： steel and RC moment resisting frames seismic retrofitting collapse probability concentric chevron bracing(CCB) cylindrical friction damper (CFD)

Topiramate induced peripheral neuropathy:A case report and review of literature

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世界临床病例杂志 2017年第12期5卷 446-452页

作者： Sherifa Ahmed hamed Department of Neurology and Psychiatry Assiut University Hospital

Drug-induced peripheral neuropathy had been rarely reported as an adverse effect of some antiepileptic drugs(AEDs) at high cumulative doses or even within the therapeutic drug doses or *** describe clinical and diagnostic features of a patient with peripheral neuropathy as an adverse effect of chronic topiramate(TPM) therapy.A 37-year-old woman was presented for the control of active epilepsy(2010).She was resistant to some AEDs as mono-or combined therapies(carbamazepine,sodium valproate,levetiracetam,oxcarbazepine and lamotrigine).She has the diagnosis of frontal lobe epilepsy with secondary generalization and has a brother,sister and son with active *** became seizure free on TPM(2013-2017) but is complaining of persistent distal lower extremities paresthesia in a stocking *** examination revealed presence of diminished Achilles tendon reflexes,stocking hypesthesia and delayed distal latencies,reduced conduction velocities and amplitudes of action potentials of posterior tibial and sural nerves,indicating demyelinating and axonal peripheral neuropathy of the lower *** exclusion of the possible causes of peripheral neuropathy,chronic TPM therapy is suggested as the most probable cause of patient's *** is the first case report of topiramate induced peripheral neuropathy in the literature.

关键词： Topiramate Peripheral neuropathy Sodium channel blockade Antiepileptic drugs