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Combination therapy using evening primrose oil and electrical stimulation to improve nerve function following a crush injury of sciatic nerve in male rats

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Neural Regeneration Research 2017年第3期12卷 458-463页

作者： Omid Badri Parviz Shahabi Jalal Abdolalizadeh Mohammad Reza Alipour Hadi Veladi Mehdi Farhoudi mohsen sharif zak Tabriz University of Medical Sciences International Branch ArasTabrizIran Neuroscience Research Center Tabriz University of Medical SciencesTabrizIran Immunology Research Center Tabriz University of Medical SciencesTabrizIran Drug Applied Research Center Tabriz University of Medical SciencesTabrizIran Microsystem Fabrication Laboratory Tabriz UniversityTabrizlran Department of Biochemistry Faculty of MedicineTabriz University of Medical SciencesTabrizIran

Peripheral nerve injuries with a poor prognosis are *** primrose oil（EPO） has beneficial biological effects and immunomodulatory *** electrical activity plays a major role in neural regeneration,the present study investigated the effects of electrical stimulation（ES）,combined with evening primrose oil（EPO）,on sciatic nerve function after a crush injury in *** anesthetized rats,the sciatic nerve was crushed using small haemostatic forceps followed by ES and/or EPO treatment for 4 *** recovery of the sciatic nerve was assessed using the sciatic functional *** changes of gastrocnemius muscle atrophy were investigated by light *** changes were assessed by the nerve conduction velocity of sciatic *** was used to determine the remyelination of the sciatic nerve following the *** ＋ ES,EPO,and ES obviously improved sciatic nerve function assessed by the sciatic functional index and nerve conduction velocity of the sciatic nerve at 28 days after *** of the peripheral nerve remyelination marker,protein zero（P0）,was increased in the treatment groups at 28 days after *** atrophy severity was decreased significantly while the nerve conduction velocity was increased significantly in rats with sciatic nerve injury in the injury ＋ EPO ＋ ES group than in the EPO or ES *** speaking,the combined use of EPO and ES may produce an improving effect on the function of sciatic nerves injured by a *** increased expression of P0 may have contributed to improving the functional effects of combination therapy with EPO and ES as well as the electrophysiological and histopathological features of the injured peripheral nerve.

关键词： nerve regeneration peripheral nerve injury sciatic nerve injury evening primrose oil electrical stimulation sciatic functional index cuff electrode neural regeneration

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PPLS: a privacy-preserving location-sharing scheme in mobile online social networks

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Science China(Information Sciences) 2020年第3期63卷 173-183页

作者： Chang XU Xuan XIE Liehuang ZHU Kashif sharif Chuan ZHANG Xiaojiang DU mohsen GUIZANI School of Computer Science and Technology Beijing Institute of Technology Department of Computer and Information Sciences Temple University Department of Computer Science and Engineering Qatar University

The recent proliferation of mobile devices has given rise to mobile online social networks(m OSNs), an emerging network paradigm that uses social networks as its main design element. As one of the most critical components in m OSNs, location sharing plays an important role in helping users share information and strengthen their social bonds, which however may compromise users’ privacy, including location information and social relationship details. To address these challenges, some solutions have been proposed. However, none of them considers the privacy of inter-user threshold distance, which effectively can be used to identify users, their friends, and location information, by malicious or undesired elements of the system. To overcome this limitation, we propose a secure distance comparison protocol. Furthermore,we present a privacy-preserving location-sharing scheme(PPLS), which allows users to build more complex access control policies. The safety of our scheme is validated by the security analysis and the experimental results demonstrate the efficiency of PPLS scheme.

关键词： privacy-preservation location-sharing mobile online social networks

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Preparation, characterization, and antibacterial activity of γ-irradiated silver nanoparticles in aqueous gelatin

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International Journal of Minerals,Metallurgy and Materials 2013年第4期20卷 403-409页

作者： Majid Darroudi Mansor B. Ahmad Mohammad Hakimi Reza Zamiri Ali Khorsand zak Hasan Ali Hosseini mohsen Zargar Department of Modern Sciences and Technologies School of Medicine Mashhad University of Medical Sciences Department of Chemistry Faculty of Science Universiti Putra Malaysia Chemistry Department Payame Noor University Department of Materials Engineering and Ceramic CICECO University of Aveiro Electroceramics and Materials Lab. Physics Department Faculty of Science Ferdowsi University of Mashhad Faculty of Science Qom Branch Islamic Azad University

Colloidal silver nanoparticles （Ag-NPs） were obtained through γ-irradiation of aqueous solutions containing AgNO3 and gelatin as a silver source and stabilizer, respectively. The absorbed dose of γ-irradiation influences the particle diameter of the Ag-NPs, as evidenced from surface plasmon resonance （SPR） and transmission electron microscopy （TEM） images. When the γ-irradiation dose was increased （from 2 to 50 kGy）, the mean particle size was decreased continuously as a result of γ-induced Ag-NPs fragmentation. The antibacterial properties of the Ag-NPs were tested against Methicillinresistant Staphylococcus aureus （MRSA）（Gram-positive） and Pseudomonas aeruginosa （P.a）（Gram-negative） bacteria. This approach reveals that the γ-irradiation-mediated method is a promising simple route for synthesizing highly stable Ag-NPs in aqueous solutions with good antibacterial properties for different applications.

关键词： silver nanoparticles silver nitrate gelatin gamma rays irradiation bacteria

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Electrical annealing of severely deformed copper: microstructure and hardness

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International Journal of Minerals,Metallurgy and Materials 2017年第10期24卷 1158-1168页

作者： Saeed Nobakht mohsen Kazeminezhad Department of Materials Science and Engineering Sharif University of Technology Azadi Avenue Tehran Iran

Commercial pure copper sheets were severely deformed after primary annealing to a strain magnitude of 2.32 through constrained groove pressing. After induction of an electrical current, the sheets were heated for 0.5, 1, 2, or 3 s up to maximum temperatures of 150, 200, 250, or 300℃. To compare the annealing process in the current-carrying system with that in the current-free system, four other samples were heated to 300℃ at holding times of 60, 90, 120, or 150 s in a salt bath. The microstructural evolution and hardness values of the samples were then investigated. The results generally indicated that induction of an electrical current could accelerate the recrystallization process by decreasing the thermodynamic barriers for nucleation. In other words, the current effect, in addition to the thermal effect, enhanced the diffusion rate and dislocation climb velocity. During the primary stages of recrystallization, the grown nuclei of electrically annealed samples showed greater numbers and a more homogeneous distribution than those of the samples annealed in the salt bath. In the fully recrystallized condition, the grain size of electrically annealed samples was smaller than that of conventionally annealed samples. The hardness values and metallographic images obtained indicate that, unlike the conventional annealing process, which promotes restoration phenomena with increasing heating time, the electrical annealing process does not necessarily promote these phenomena. This difference is hypothesized to stem from conflicts between thermal and athermal effects during recrystallization.

关键词： annealing severe plastic deformation copper microstructure hardness

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Incremental dynamic analysis of concrete gravity dams including base and lift joints

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Earthquake Engineering and Engineering Vibration 2013年第1期12卷 119-134页

作者： Mohammad Alembagheri mohsen Ghaemian Dept.of Civil Engineering Sharif Univ.of TechnologyAzadi Ave.TehranIran

The growth in computer processing power has made it possible to use time-consuming analysis methods such as incremental dynamic analysis（IDA） with higher accuracy in less *** an IDA study,a series of earthquake records are applied to a structure at successively increasing intensity levels,which causes the structure to shift from the elastic state into the inelastic state and finally into *** this way,the limit-states and capacity of a structure can be *** the present research,the IDA of a concrete gravity dam considering a nonlinear concrete behavior,and sliding planes within the dam body and at the dam-foundation interface,is *** influence of the friction angle and lift joint slope on the response parameters are investigated and the various limit-states of the dam are *** is observed that by introducing a lift joint,the tensile damage can be avoided for the dam *** lift joint sliding is essentially independent of the base joint friction angle and the upper ligament over the inclined lift joint slides into the upstream direction in strong earthquakes.

关键词： concrete gravity dams incremental dynamic analysis seismic analysis damage index dam failures joints performance characteristics structural capacity

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A comparative study of physicochemical and photocatalytic properties of visible light responsive Fe,Gd and P single and tri-doped TiO_2 nanomaterials

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Journal of Rare Earths 2018年第1期36卷 72-85页

作者： seyed mohsen adyani mohammad ghorbani department of materials science and engineering sharif university of technologyPO．Box 11155-9466Tehran，lran institute for nanoscience and nanotechnology(inst) sharif university of technologyP0．Box 11155-8639，Tehran1ran

High performance Fe-Gd-P tri-doped TiO2 nanoparticles （1 at% for each dopant） were successfully synthesized by a modified sol-gel method. Various analytical and spectroscopic techniques were carried out to determine the physicochemical properties of the prepared samples, including XRD, EDX, FESEM, BET, FFIR, XPS, PL, EIS and UV-Vis diffuse reflectance spectroscopy. The photocatalytic activities of prepared samples were evaluated by photo degradation of methyl orange （MO） and 4-chlorophenol （4- CP） as model pollutants under visible light irradiation. Effects of each dopant on different properties of TiO2 nanoparticles were investigated. Results show that Gd and P doping enhances Ti02 surface textural properties by forming Ti O Gd and Ti-O-P bonds. It is found that Gd plays a superior role in increasing oxygen vacancies and organic species on TiO2 surface. Gd doping also facilitates transferring of the photo-induced charge carriers to the surface adsorbed species. The enhanced electronic band structure and visible light response, as well as high electron lifetime of Fe-Gd-P tri-doped sample is mainly attributed to Fe and Gd doping. The tri-doped TiO2 with rate constant ofkapp - 1.28 ~ 10-2 min-1 for MO and kapp ~ 0.94 ~ 10-2 min-1 for 4-CP, shows the highest photodegradation rate among all samples including undoped and single doped samples. The improved photocatalytic performance of Fe-Gd-P tri- doped Ti02 is due to the synergistic effect of enhanced surface chemistry and textural properties, increased number of surface adsorbed hydroxyl groups and organic species, improved visible light ab- sorption, increased lifetime of the photo-induced electron/hole pairs and boosted interfacial charge transfer.

关键词： Fe-Gd-P tri-doped TiO2Sol-gel synthesisPhotodegradationVisible light responseSynergistic effectRare earths

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Effect of seismic wave propagation in massed medium on rate-dependent anisotropic damage growth in concrete gravity dams

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Frontiers of Structural and Civil Engineering 2021年第2期15卷 346-363页

作者： Alireza DANESHYAR Hamid MOHAMMADNEZHAD mohsen GHAEMIAN Civil Engineering Department Sharif University of TechnologyTehran11155-9313Iran Faculty of Civil Water and Environmental EngineeringShahid Beheshti UniversityTehran11155-9313Iran

Seismic modeling of massive structures requires special caution,as wave propagation effects significantly affect the *** becomes more crucial when the path-dependent behavior of the material is *** coexistence of these conditions renders numerical earthquake analysis of concrete dams ***,a finite element model for a comprehensive nonlinear seismic simulation of concrete gravity dams,including realistic soil-structure interactions,is introduced.A semi-infinite medium is formulated based on the domain reduction method in conjunction with standard viscous *** representation of radiation damping in a half-space medium and wave propagation effects in a massed foundation are verified using an analytical solution of vertically propagating shear waves in a viscoelastic half-space domain.A rigorous nonlinear finite element model requires a precise description of the material ***,a microplane-based anisotropic damage-plastic model of concrete is formulated to reproduce irreversible deformations and tensorial degeneration of concrete in a coupled and rate-dependent ***,the Koyna concrete gravity dam is analyzed based on different assumptions of foundation,concrete response,and reservoir *** between responses obtained based on conventional assumptions with the results of the presented comprehensive model indicates the significance of considering radiation damping and employing a rigorous constitutive material model,which is pursued for the presented model.

关键词： soil-structure interaction massed foundation radiation damping anisotropic damage

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Investigation of Io's auroral hiss emissions due to its motion in Jupiter's magnetosphere

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Research in Astronomy and Astrophysics 2012年第6期12卷 693-702页

作者： mohsen H.Moghimi Department of Aerospace Engineering Sharif University of TechnologyTehranIran

The left-hand side of the auroral hiss emission observed by Galileo has a frequency time profile shaped very similar to the funnel shape observed in the Earth＇s auroral region. This close similarity indicates that we can use the theory of whistler- mode propagation near the resonance cone to locate the emission source. The general characteristics of the whistler mode are discussed. Then the position of the emission source is investigated using a geometrical method that takes into account the trajectory of Galileo. Initially a point source is assumed. Then the possibility of a sheet source aligned along the magnetic field lines which tigated. Both types of sources show that the close to the surface of Io. are tangent to the surface of Io is inves- whistler mode radiation originates veryclose to the surface of Io.

关键词： data analysis -- detectors -- magnetic fields -- spectrographs

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Seismic analysis of dam-foundation-reservoir system including the effects of foundation mass and radiation damping

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Earthquake Engineering and Engineering Vibration 2019年第1期18卷 203-218页

作者： Hamid Mohammadnezhad mohsen Ghaemian Ali Noorzad Department of Civil Engineering Sharif University of Technology Faculty of Civil Water and Environmental Engineering Shahid Beheshti University

One of the main concerns in using commercial software for finite element analyses of dam-foundation-reservoir systems is that the simplifying assumptions of the massless foundation are unreliable. In this study, an appropriate direct finite element method is introduced for simulating the mass, radiation damping and wave propagation effect in foundations of damfoundation-reservoir systems using commercial software ABAQUS. The free-field boundary condition is used for modeling the semi-infinite foundation and radiation damping, which is not a built-in boundary condition in most of the available commercial software for finite element analysis of structures such as ANSYS or ABAQUS and thus needs to be implemented differently. The different mechanism for modeling of the foundation, earthquake input and far-field boundary condition is described. Implementation of the free-field boundary condition in finite element software is verified by comparing it with analytical results. To investigation the feasibility of the proposed method in dam-foundation-reservoir system analysis, a series of analyses is accomplished in a variety of cases and the obtained results are compared with the substructure method by using the EAGD-84 program. Finally, the massed and massless foundation results are compared and it is concluded that the massless foundation approach leads to the overestimation of the displacements and stresses within the dam body.

关键词： dam-foundation interaction radiation damping free-field boundary condition massed foundation

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Evaluation of behaviors of earth and rockfill dams during construction and initial impounding using instrumentation data and numerical modeling

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第4期9卷 709-725页

作者： Mohammad Rashidi S. mohsen Haeri University of Texas at El Paso El Paso USA sharif University of Technology Tehran Iran

In this study,the behavior of Gavoshan dam was evaluated during construction and the first impounding.A two-dimensional（2D） numerical analysis was conducted based on a finite difference method on the largest cross-section of the dam using the results of instrument measurements and back *** evaluations will be completed in the case that back analysis is carried out in order to control the degree of the accuracy and the level of confidence of the measured behavior since each of the measurements could be controlled by comparing it to the result obtained from the numerical *** that,by comparing the results of the numerical analysis with the measured values,it is indicated that there is a proper consistency between these two ***,it was observed that the dam performance was suitable regarding the induced pore water pressure,the pore water pressure ratio r;,settlement,induced stresses,arching degree,and hydraulic fracturing probability during the construction and initial impounding *** results demonstrated that the maximum settlement of the core was 238 cm at the end of *** the following 6 years after construction（initial impounding and exploitation period）,the accumulative settlement of the dam was 270 *** is clear that 88% of the total settlement of the dam took place during dam *** reason is that the clay core was smashed in the wet side,*** optimum moisture *** the average curving ratio was 0.64 during dam construction; at the end of the initial impounding,the maximum amount of curving ratio in the upstream was 0.81,and the minimum（critical） amount in the downstream was *** was also concluded that this dam is safe in comparison with the behaviors of other similar dams in the world.

关键词： Earth and rockfill dams Initial impounding Numerical modeling Instrumentation Settlement Pore pressure

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