Showing 6 results for Hatamian
Volume 2, Issue 2 (Summer 2018)
Abstract
Fiber production in nanoscale prepares high surface contact for fibers and leads to the improvement of their properties with respect to other fibers. A convenient and effective method for nanofiber production with different diameters is electrospinning. Various effective parameters on electrospinning processes, including environmental, equipment, and solution variables can produce fibers with different morphologies. PVA has been used in various fields of applied research because of its high thermal stability, biocompatibility, non-toxic and solubility in water. The published reports indicated that properties of the PVA are improved with the addition of bentonite. In this research, to prepare PVA/nano-bentonite nanofiber membrane, the optimum amounts of three effective variables on the above-mentioned processes were determined. According to the obtained results, the voltage of 11 kV, the feeding rate of 0.5 mL/h and bentonite concentration of 3% w/w were optimum conditions for the process of PVA/nano-bentonite nanofiber composite production. In this condition, the average diameter of produced nanofibers was 243 nm with the standard deviation of 0.0551 and the tensile strength of 7.64 MPa. The results showed that the addition of bentonite to PVA increase intensity of nanofibers and decrease the diameter of nanofibers from 308 nm to 243nm.Therfore, the produced PVA/bentonite nanofiber composite is a good membrane for water treatment.
Volume 3, Issue 4 (Winter 2020)
Abstract
Research subject: Parkinson’s disease is a neurodegnerative disorder with no treatment due to the blood brain barrier (BBB) existence. The cure for this disease is Dopamine a chemical molecule.
Research approach: This study investigates biodegradable naoparticles (NPs) carrying dopamine (DA) across the blood–brain barrier. Ion polymerization and solvent methods were used to achieve this goal. Particle size, zeta potential, entrapment efficiency and in vitro drug release behavior, at pH 7 were examined.
Main results: The empty nanoparticles and drug-loaded nanoparticles were found to be spherical in shape and fluffy exterior, with mono-modal size distribution and negative zeta-potentials of increasing average sizes 90 to 120 nm simultaneously. Fourier transform infrared (FTIR) spectra demonstrated the polymerization of nBCA monomers and encapsulation of DA inside poly (butylcyanoacrylate) (PBCA).Thermal characteristics of the copolymer were investigated by Fourier-transform infrared spectroscopy (FTIR). Drug loading efficiency was around 25%.The in-vitro drug release profile of DA -loaded PBCA nanoparticles prepared from ion polymerization following solution techniques exhibited a gradual release; more than 20 ٪w/w of the drug was released after 51 h. The results showed that the DA–PBCA nanocapsules could be an effective carrier for hydrophilic agents. In this study, PBCA-NSPs were successfully generated as a delivery system for DA, providing a promising approach to improve the therapy of PDs.
Volume 4, Issue 2 (4-2012)
Abstract
Chahar-taqi is a valuable form of Iranian architecture used in the construction of religious and other types of structures in pre-and post-Islamic periods.According to the available archaeological evidence, it has been used in pre-Islamic architecture, especially from the Median period as a plan for construction of fire altars. After a while, this form of architecture became more common, and was used in the construction of such structures as palace. The Chahar- taqi plan was also used during the Islamic period, although there are limited vestiges of its use in the first four centuries of Islamic period. However, with the rise of Seljuk dynasty, and the need to expand the architectural spaces like mosques, this construction plan was widely used in the construction of mosques, palaces and castles. Based on the archetype hypothesis by Jung, the authors set out to analyze the reasons for selecting this architecture form and its continuation from Sassanid to the Islamic period by mentioning evidences of its sacred aspect in Islamic sources. In other words, the question is whether chahar-tag (four-typed) architecture is a model derived from the common beliefs of the society or unconscious tribal mind of pre-Islamic peoples of Iran, found its way, gained ground and evolved in human mind in this land, and used in the construction of other structures such as palaces, castles, mosques and tomb monuments.
Volume 9, Issue 2 (Spring 2018)
Abstract
Aims: Today, crude oil is one of the main sources of energy. The combustion of sulfur-containing compounds in fossil fuels leads to the production of sulfur oxides that has adverse effects to human health and the environment. At the moment, the current method for removal of sulfur is Hydrodesulfurization. The aim of this study was to investigate the effect of magnetic nanoparticles and modified carbon nanotubes as nano-adsorbent on improving the biodesulfurization activity of microorganisms (Rhodococcus erythropolis IGTS8).
Materials and Methods: In the current experimental study, the nanoparticles were synthesized by chemical co-precipitation and the carbon nanotubes were initially carboxylated. Multi-layer carbon nanotubes were mixed with 95% sulfuric acid and 52% nitric acid (volume ratio 1:3) and, then, modified by polyethylene glycol. In order to characterize nanoparticles and carbon nanotubes, scanning transmission electron microscopy (STEM), X-ray diffraction, magnetic surveys, analysis of arch Raman, and fourier-transform infrared spectroscopy (FTIR) were conducted.
Findings: The size of nanoparticles was estimated to be 7-8nm and modified carbon nanotubes showed the highest solubility as well as stability in deionized water for two weeks. The growth of microorganisms in the presence of magnetic nanoparticles and carbon nanotubes compared to their absence increased by 40% and 8%, respectively. Moreover the desulfurization activity of microorganisms in the presence of magnetic nanoparticles and carbon nanotubes showed a significant increase compared to their absence.
Conclusion: Nanoparticles with adsorption of sulfur compounds increase their availability for microorganisms.
Volume 16, Issue 93 (November 2019)
Abstract
In this study, the effect of incorporating chia seed modified flour(MSF) (0-7.5 %) on moisture content, fat content, total fiber content, antioxidant activity, total phenol content, color, texture and organoleptic characteristics of functional barbari bread was evaluated. The results showed addition of MSF increased the moisture content, oil and total fiber content, total phenol content and antioxidant activity (17.9±0.9 % to 66.2 ± 0.2%) in the samples. While increasing the amount of MSF, the L* value and hardness of the samples was decreased. The organoleptic characteristics of bread containing 2.5% MSF had no significant different (P<0.05) with the control. Increasing the replacement of wheat flour with MSF (2.5 to 7.5%) reduced the acceptability of organoleptic characteristics of bread. Based on the results of the simultaneous thermal analysis (STA), the enthalpy for control was 4119.94 (J/g) and for the bread containing 5% MSF was about 4369.1 (J/g). SEM results showed that the incorporation of MSF created a more uniform structure with smaller cavities in the bread.
Javad Neyestani, Mohammad Jafar Hatamian, Hossein Sedighian,
Volume 19, Issue 3 (7-2012)
Abstract
Undoubtedly, pottery is among the most important information types that can help understand societies and cultures better. Despite introducing pottery known as Sultān Abād and its classification over the last few decades, very limited information has been published so far on the origin of its type and about archeological sites containing them. The main reason for this seems to be that containers could not be found in archeological excavations, and most of these potteries were obtained through illegal excavations hence; are part of private collections and museums. Consequently, our understanding on their origin, extent and distribution is very limited. In the current study, we attempt to present a brief introduction about the technical and decorative features of this pottery type, its construction origin, historical background and the likely place or places of its production. Then, based on information from recent archaeological excavations and surveys, this pottery type is described and explained.
