检索结果-南通市图书馆

Ultrasound-assistant preparation of Cu-SAPO-34 nanocatalyst for selective catalytic reduction of NO by NH_3

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第9期27卷 135-143页

作者： Parvaneh Nakhostin Panahi Ali Niaei Darush Salari Seyed mahdi mousavi Gérard Delahay Department of Chemistry Faculty of Science University of Zanjan Department of Chemical Engineering & Petroleum University of Tabriz Department of Applied Chemistry Faculty of Chemistry University of Tabriz Faculty of Chemistry University of Kashan Institut Charles Gerhardt UMR 5253 CNRS/UM2/ENSCM/UM1 Equipe"Matériaux Avancés pour la Catalyse et la Santé"Ecole Nationale Supérieure de Chimie de Montpellier 8 rue de l'Ecole Normale34296 Montpellier cedex France

The influence of the various preparation methods of Cu-SAPO-34 nanocatalysts on the selective catalytic reduction of NO with NH3 under excess oxygen was studied. Cu-SAPO-34 nanocatalysts were prepared by using four techniques： conventional impregnation（IM）,ultrasound-enhanced impregnation（UIM）, conventional deposition precipitation（DP） using Na OH and homogeneous deposition precipitation（HDP） using urea. These catalysts were characterized in detail by various techniques such as N2-sorption, XRD, TEM, H2-TPR,NH3-TPD and XPS to understand the catalyst structure, the nature and the dispersed state of the copper species, and the acid sites for NH3 adsorption. All of the nanocatalysts showed high activities for NO removal. However, the activities were different and followed the sequence of Cu-SAPO-34（UIM）〉 Cu-SAPO-34（HDP）〉 Cu-SAPO-34（IM）〉 Cu-SAPO-34（DP）.Based on the obtained results, it was concluded that the NO conversion on Cu-SAPO-34 nanocatalysts was mainly related to the high reducibility of the isolated Cu^2＋ions and Cu O species, the number of the acid sites and the dispersion of Cu O species on SAPO-34.

关键词： NO NH3-SCR Cu-SAPO-34 Ultrasonic impregnation

Study of M-ZSM-5 nanocatalysts(M: Cu, Mn, Fe, Co …) for selective catalytic reduction of NO with NH_3: Process optimization by Taguchi method

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2015年第10期23卷 1647-1654页

作者： Parvaneh Nakhostin Panahi Darush Salari Aligholi Niaei Seyed mahdi mousavi Department of Chemistry Faculty of Science University of Zanjan Department of Applied Chemistry Faculty of Chemistry University of Tabriz Department of Chemical Engineering & Petroleum University of Tabriz Faculty of Chemistry University of Kashan

A series of different transition metals(V,Co,Cr,Mn,Fe,Ni,Cu and Zn) promoted H-ZSM-5 catalysts were prepared by impregnation method and characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The catalytic activity of these catalysts was evaluated for the selective catalytic reduction(SCR) of NO with NH_3 as reductant in the presence of *** results revealed that the catalytic activity of Cu-ZSM-5 nanocatalyst for NO conversion to N_2 was 80%at 300 ℃,which was the best among various promoted *** of experiments(DOEs) with Taguchi method was employed to optimize NH_3-SCR process parameters such as NH_3/NO ratio,O_2 concentration,and gas hourly space velocity(GHSV) over Cu-ZSM-5 nanocatalyst at 250 and 300 ℃.Results showed that the most important parameter in NH_3-SCR of NO is O_2 concentration;followed by NH_3/NO ratio and GHSV has little *** NO conversion to N_2 of 63.1%and 94.86%was observed at 250℃ and 300℃,respectively under the obtained optimum conditions.

关键词： NO SCR ZSM-5 Transition metal Taguchi method

Anticancer Effects of Valproic Acid on Esophageal Stem-like Carcinoma Cells

在线全文

学校读者我要写书评

暂无评论

生物化学与生物物理进展 2016年第9期43卷 903-909页

作者： SABOOR-MALEKI Saffiyeh RASSOULI Fatemeh B. MATIN Maryam M. mousavi mahdi Department of Biology Faculty of Science Ferdowsi University of Mashhad Mashhad Iran Cell and Molecular Biotechnology Research Group Institute of Biotechnology Ferdowsi University of Mashhad Mashhad Iran

Valproic acid(VPA) is a histone deacetylase inhibitor that has been an object of interest to clinicians for its promising potency in cancer therapy, as it induces apoptosis and differentiation, and enhances of chemotherapy sensitivity. Esophageal squamous cell carcinoma(ESCC) is a malignant disease with growing incidence and low survival rate. Due to limited information on VPA activity in ESCC cells, we aimed to determine effects of VPA on chemotherapy responsiveness and expression of malignant markers in ESCC stem-like cells. Upon coadministration of non-toxic VPA + cisplatin(DDP), paclitaxel and 5-fluorouracil, viability of KYSE30 cells was assessed, and induced apoptosis was evaluated by DAPI staining, DNA laddering and flow cytometry. In addition, real time RT-PCR was performed to study changes in the expression of P21, CD44 and BMI-1 upon treatments. MTT test demonstrated that VPA significantly(P < 0.05) increased toxicity of DDP, which was confirmed by DNA laddering, flow cytometry analysis and significant(P < 0.05) overexpression of P21. Moreover, real time RT-PCR results indicated significant(P < 0.05) down regulation of CD44 and BMI-1 after VPA administration. Present attempt provided evidence, for the first time, that VPA not only improved responsiveness of esophageal stem-like cancer cells to DDP, also negatively regulated cancer stem cells markers in these cells.

关键词：丙戊酸钠肿瘤治疗方法临床分析

Ground motion record simulation for structural analysis by consideration of spectral acceleration autocorrelation pattern

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2014年第2期13卷 195-202页

作者： Alireza Azarbakht mahdi Sadeghi Mehdi mousavi Department of Civil Engineering Faculty of Engineering Arak University

A novel approach is introduced to generate simulated ground motion records by considering spectral acceleration correlations at multiple periods. Most of the current reliable Ground Motion Record(GMR) simulation procedures use a seismological model including source, path and site characteristics. However, the response spectrum of simulated GMR is somewhat different when compared with the response spectrum based on recorded GMRs. More specifi cally, the correlation between the spectral values at multiple periods is a characteristic of a record which is usually different between simulated and recorded GMRs. As this correlation has a signifi cant infl uence on the structural response, it is needed to investigate the consistency of the simulated ground motions with actual records. This issue has been investigated in this study by incorporating an optimization algorithm within the Boore simulation technique. Eight seismological key parameters were optimized in order to achieve approximately the same correlation coeffi cients and spectral acceleration between two sets of real and simulated records. The results show that the acceleration response spectra of the synthetic ground motions also have good agreement with the real recorded response spectra by implementation of the proposed optimized values.

关键词： stochastic method simulation ground motion random vibration site amplifi cation EXSIM program

Efficient pipelined flow classification for intelligent data processing in IoT

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2022年第4期8卷 561-575页

作者： Seyed Navid mousavi Fengping Chen mahdi Abbasi Mohammad R.Khosravi Milad Rafiee Department of Computer Engineering Engineering FacultyBu-Ali Sina UniversityHamedanIran Shandong Provincial University Laboratory for Protected Horticulture Weifang University of Science and TechnologyShouguang262700China Telecommunications Group Department of Electrical and Electronic EngineeringShiraz University of TechnologyShirazIran

The packet classification is a fundamental process in provisioning security and quality of service for many intelligent network-embedded systems running in the Internet of Things(IoT).In recent years,researchers have tried to develop hardware-based solutions for the classification of Internet *** to higher throughput and shorter delays,these solutions are considered as a major key to improving the quality of *** of these efforts have attempted to implement a software algorithm on the FPGA to reduce the processing time and enhance the *** proposed architectures,however,cannot reach a compromise among power consumption,memory usage,and throughput *** view of this,the architecture proposed in this paper contains a pipelinebased micro-core that is used in network processors to classify *** this end,three architectures have been implemented using the proposed *** first architecture performs parallel classification based on header *** second one classifies packets in a serial *** last architecture is the pipeline-based classifier,which can increase performance by nine *** proposed architectures have been implemented on an FPGA *** results are indicative of a reduction in memory usage as well as an increase in speedup and *** architecture has a power consumption of is 1.294w,and its throughput with a frequency of 233 MHz exceeds 147 Gbps.

关键词： Efficiency Intelligent flow processing IoT Packet classification Pipeline

Tectonic paleostress field and its impact on the geodynamic evolution of Central Iran, case study: the Shotori Mountain

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2023年第10期20卷 3018-3034页

作者： Razieh ABBASPOUR Seyed Morteza mousavi Ahmad RASHIDI Mohammad mahdi KHATIB Shahram SHAFIEIBAFTI Department of Geology University of BirjandBirjand ***Iran Department of Earthquake Research Shahid Bahonar University of KermanKerman ***Iran International Institute of Earthquake Engineering and Seismology Tehran ***Iran Department of Geology Shahid Bahonar University of KermanKerman ***Iran

The Shotori mountain range is located along the northern terminus of the Nayband fault on the eastern and western domains of the Tabas and Lut blocks,*** range with NNW-SSE trending and approximately 120 km long includes a series of thrust faults approaching the right-lateral strike-slip Nayband *** the Shotori range has experienced various geological events since the Triassic,our investigations suggest that the basement of the Central Iranian subcontinent of the Shotori range contains the early Triassic deep sedimentary with normal faults which confirms Triassic tensional tectonic stress regime in the *** the middle Triassic,the mountain range has experienced thrust and strike-slip ***,in this study,we reconstruct the stress regimes for different geological periods using fault-slip *** inversion of faultslip data reveals drastic temporal changes in the maximum stress regime(σ1)over the Triassic,Jurassic,Cretaceous,Paleogene,Neogen,and *** reconstruction of the stress field based on the age and direction of fault movement reveals that the direction of the maximum horizontal stress axis(σ1)under a tensional stress regime was approximately N129°in the Early *** stress regime is the cause of thinning and subsidence of the Shotori sedimentary *** the middle Triassic,theσ1 direction was about N81°and the upper Triassic,theσ1 direction was almost N115°.The middle Triassic and upper Triassic stress states exhibited two distinct strike-slip and compressive stress *** stress regime led to the uplift of the Shotori sedimentary *** the Jurassic,the direction of the maximum horizontal stress axis(σ1)was~NW-SE under a compressive stress *** the Triassic,theσ1 direction was~*** stress regime led to the formation of the high topography of the Shotori Mountain *** the Late Cretaceous,the direction of the maximum horizontal stress axis(σ1)under the extensional stress

关键词： Paleostress Fault-slip data Geodynamics Shotori mountain range Tabas Central Iran

Effects of graphene oxide/TiO_(2) nanocomposite,graphene oxide nanosheets and Cedr extraction solution on IFT reduction and ultimate oil recovery from a carbonate rock

在线全文

学校读者我要写书评

暂无评论

Petroleum 2022年第4期8卷 476-482页

作者： Amin Garmroudi mahdi Kheirollahi Sayed Amirhosein mousavi Moslem Fattahi Elaheh Hamed Mahvelati Department of Petroleum Engineering Abadan Faculty of Petroleum EngineeringPetroleum University of Technology(PUT)AbadanIran Department of Chemical Engineering Abadan Faculty of Petroleum EngineeringPetroleum University of Technology(PUT)AbadanIran Department of Basic Sciences Abadan Faculty of Petroleum EngineeringPetroleum University of Technology(PUT)AbadanIran

Increasing the number of depleted reservoirs and global demand for energy have left us with low alternative but to use new ways to extract more *** different material used for tertiary oil recovery,surfactant injection has proved very promising solutions,such as interfacial tension reduction and wettability *** any harm to the environment and meanwhile being economically feasible,natural surfactants have been attracted researchers in recent *** extraction which is produced from Zizyphus Spina Christi leaves has shown some beneficial characteristics like IFT reduction and wettability ***,the amount of IFT reduction is not considerable,so we decided to augment its effectiveness by adding two different *** this investigation,three concentrations(0.01,0.05 and 0.1 wt%)of both graphene oxide(GO)nanosheet and GO/TiO_(2) nanocomposite was added to Cedr extraction solution to study their potential on IFT reduction and improving the ultimate oil *** concentration of 0.05 wt percent showed the lowest IFT in both *** this concentration,the IFT of GO/TiO_(2)-augmented solution and GO-augmented solution were measured of 10.5 and 12.3 mN/m,*** the bare Cedr solution showed 23.8 mN/m at its critical micelle *** coreflooding tests were also performed at the aforementioned *** oil recovery reached to 65%of original oil volume in GO/TiO_(2)-augmented solution,compared to 56% in GO-augmented solution case and 40%in bare Cedr solution *** Electron Microscopy images were also taken from the rock samples exposed to nanofluids to investigate any severe harm to the *** showed low tendency of both particles to adsorb on rock surface and plug large pores.

关键词： Cedr extraction Coreflooding GO nanosheet GO-TiO_(2)nanocomposite IFT reduction Enhanced oil recovery

Mathematical modeling of fractional derivatives for magnetohydrodynamic fluid flow between two parallel plates by the radial basis function method

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2022年第4期12卷 241-250页

作者： Saman Hosseinzadeh Seyed mahdi Emadi Seyed Mostafa mousavi Davood Domairry Ganji Department of Mechanical Engineering Babol Noshirvani University of TechnologyBabolIran

Investigations into the magnetohydrodynamics of viscous fluids have become more important in recent years,owing to their practical significance and numerous applications in astro-physical and geo-physical *** this paper,the radial base function was utilized to answer fractional equation associated with fluid flow passing through two parallel flat plates with a magnetic *** magnetohydrodynamics coupled stress fluid flows between two parallel plates,with the bottom plate being stationary and the top plate moving at a persistent *** compared the radial basis function approach to the numerical method(fourth-order Range-Kutta)in order to verify its *** findings demonstrated that the discrepancy between these two techniques is quite negligible,indicating that this method is very *** impact of the magnetic field parameter and Reynolds number on the velocity distribution perpendicular to the fluid flow direction is ***,the velocity parameter is compared for diverse conditionsα,Reynolds and position(y),the maximum of which occurs atα=***,the maximum velocity values occur inα=0.4 and Re=1000 and the concavity of the graph is less forα=0.8.

关键词： Magnetohydrodynamic fluid Fractional equation Radial basis function method Numerical method

Robust Optimal Higher-order-observer-based Dynamic Sliding Mode Control for VTOL Unmanned Aerial Vehicles

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2021年第5期18卷 802-813页

作者： Yashar mousavi Amin Zarei Arash mousavi Mohsen Biari Department of Applied Science School of ComputingEngineering and Built EnvironmentGlasgow Caledonian UniversityGlasgow G4 OBAUK Department of Electrical and Computer Engineering University of Sistan and BaluchestanZahedan ***Iran Department Electrical Engineering and Applied Sciences Paradise Research CenterJahrom ***Iran Faculty of Electrical and Robotic Engineering Shahrood University of TechnologyShahrood ***Iran

This paper investigates the precise trajectory tracking of unmanned aerial vehicles(UAV) capable of vertical take-off and landing(VTOL) subjected to external disturbances. For this reason, a robust higher-order-observer-based dynamic sliding mode controller(HOB-DSMC) is developed and optimized using the fractional-order firefly algorithm(FOFA). In the proposed scheme, the sliding surface is defined as a function of output variables, and the higher-order observer is utilized to estimate the unmeasured variables,which effectively alleviate the undesirable effects of the chattering phenomenon. A neighboring point close to the sliding surface is considered, and as the tracking error approaches this point, the second control is activated to reduce the control input. The stability analysis of the closed-loop system is studied based on Lyapunov stability theorem. For a better study of the proposed scheme, various trajectory tracking tests are provided, where accurate tracking and strong robustness can be simultaneously ensured. Comparative simulation results validate the proposed control strategy′s effectiveness and its superiorities over conventional sliding mode controller(SMC) and integral SMC approaches.

关键词： Unmanned aerial vehicle dynamic sliding mode trajectory tracking fractional firefly algorithm vertical take-off and landing system