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4 results on '"Ashkan Garshasbi"'

1. Parthian Royal Titles on the Coins

Author

Cyrus Nasrollahzadeh and Ashkan Garshasbi

Subjects
parthian numismatics, parthian history, parthian royal titles, parthian inscriptions, History (General), D1-2009, Auxiliary sciences of history
Abstract

Parthian era is an important part of the history of Iran and the world, and one of the most accessible resources to identify and study different political, social and artistic aspects of this time is to study the coins of that era. Inscriptions and the names listed on Parthian coins, often written in Greek, had a variety of purposes, including the political, familial, ethnical and religious aspects. The reason for such a use can be found from the nature of coins because they were an efficient tool for sending the Parthian kings message to different communities under their influence. In the second half of the Parthian era, some titles were gradually appeared on coins in Parthian language and in the last decades, the Greek titles lost their advertising use and remained as an element of little importance and illegible in many cases, on the coins of this era. This research using library resources alongside of museum reviews, and analyze of the obtained data, studies the process of forming, quiddity and the reasons of the decline of the inscriptions in Parthian coins.

Published
2016
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2. Membrane-based reactive separations for process intensification during power generation

Author

Theodore T. Tsotsis, Paul K. T. Liu, Richard J. Ciora, Vasilios I. Manousiouthakis, Seçgin Karagöz, Ashkan Garshasbi, Huanhao Chen, and Mingyuan Cao

Subjects
Chromatography, Membrane reactor, Hydrogen, business.industry, chemistry.chemical_element, Context (language use), 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Catalysis, Water-gas shift reaction, 0104 chemical sciences, Electricity generation, Membrane, chemistry, Integrated gasification combined cycle, Coal, 0210 nano-technology, Process engineering, business
Abstract

We present here a study of the water gas shift membrane reactor (WGS-MR) in the context of its potential application in the IGCC process for power generation from coal. In our research, we use in the WGS-MR a sour-shift WGS catalyst and carbon molecular sieve (CMS) membranes, and show that the reactor displays higher conversions than a conventional packed-bed reactor (PBR) under the IGCC-relevant conditions, i.e., for temperatures up to 300 °C and pressures up to 25 bar. Our experimental results manifest the ability of the WGS-MR to operate under the desired conditions and to improve the efficiency of the WGS reaction. They demonstrate, in addition, the potential of the MR to carry out the in-situ separation of hydrogen using the CMS membranes. We conclude from our study, that the CMS-membrane-based WGS-MR is a good candidate technology for incorporation into IGCC power plants for environmentally-benign power generation.

Published
2019

3. Study on the removal of heavy metal ions from industry waste by carbon nanotubes: Effect of the surface modification: a review

Author

Shilpi Agarwal, Hamidreza Sadegh, Inderjeet Tyagi, Abdel Salam Hamdy Makhlouf, Vinod Kumar Gupta, Ashkan Garshasbi, Omid Moradi, Mohammad Goodarzi, and Ramin Shahryari-ghoshekandi

Subjects
Environmental Engineering, Materials science, Waste management, Metal ions in aqueous solution, Nanoparticle, 02 engineering and technology, Carbon nanotube, 010501 environmental sciences, 021001 nanoscience & nanotechnology, 01 natural sciences, Pollution, law.invention, Adsorption, Wastewater, Chemical engineering, law, medicine, Surface modification, Sewage treatment, 0210 nano-technology, Waste Management and Disposal, 0105 earth and related environmental sciences, Water Science and Technology, Activated carbon, medicine.drug
Abstract

Removal of noxious materials such as heavy metal ions (which are hazardous above certain ppm concentration) from wastewater is one of the biggest environmental challenges that suffers the economy nowadays. On the basis of their versatility, environmental friendliness, the adsorption was proved to be a most economical and efficient technology, which is used extensively for their removal from the aqueous media. Among the various developed adsorbents used so far, carbon nanotubes (CNTs) show a unique impact on the fast adsorption and rapid removal of noxious impurities from the aqueous source. CNTs festooned on the sources like activated carbon, nanoparticles, and nanocomposities enhanced the efficiency and potential of the adsorbent. Due to their unique structural, electronic, optoelectronic, semiconductor, as well as mechanical, chemical, and physical properties, they have been extensively used to remove heavy metals in wastewater treatment. The adsorption mechanisms are majorly contributed by the ...

Published
2015

4. Comparative investigation of the formation of polytetrafluoroethylene nanoparticles on different solid substrates through the adsorption of tetrafluoroethylene

Author

Reza Pooladi, Afsaneh Safavi, Mohammad Hossein Sheikhi, Ashkan Garshasbi, and Mohammad Mahdi Doroodmand

Subjects
Thermogravimetric analysis, Polytetrafluoroethylene, Materials science, Polymers and Plastics, Carbon nanofiber, Nanoparticle, General Chemistry, Surfaces, Coatings and Films, Nanomaterials, chemistry.chemical_compound, Adsorption, chemistry, Chemical engineering, Polymer chemistry, Materials Chemistry, Tetrafluoroethylene, Fourier transform infrared spectroscopy
Abstract

The effects of different solid substrates, including carbon nanofibers (CNFs), activated carbon, alumina, silica, molecular sieves, and poly(N-vinylpyrrolidione) (PVP), were compared for the high-pressure synthesis of polytetrafluoroethylene [PTFE or (CF2)n] nanoparticles via the adsorption of thermally synthesized tetrafluoroethylene (C2F4) as the monomer. Scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis (TGA) were used for the characterization of the PTFE nanoparticles on different solid substrates. The results demonstrate that the average diameters of the PTFE nanoparticles were about 90 nm for the CNFs, 130 nm for PVP, 150 nm for alumina, and about 200 nm for silica. Also, TGA showed that the amounts of PTFE nanoparticles synthesized on each solid substrate were 3.53 ± 0.09% for CNFs, 2.31 ± 0.10% for PVP, 2.11 ± 0.12% for silica, and 0.97 ± 0.16% for alumina. Depending on the active surface area and the morphology of nanomaterials, such as CNFs, different capacities were evaluated for each solid support in the formation of the PTFE nanoparticles. The quantities and the size of the synthesized PTFE nanoparticles relied on the characteristics of the solid substrate. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

Published
2011

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