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Ramis Mustafa Oksuzog?lu,Ozlem Akman,Mustafa Yildirim,Bekir Aktas¸ 한국자기학회 2012 Journal of Magnetics Vol.17 No.4
Ferromagnetic resonance and X-ray specular reflectivity measurements were performed on Ni81Fe19/Ir20Mn80/ Co90Fe10 exchange bias trilayers, which were grown using the pulsed-DC magnetron sputtering technique on Si(100)/SiO2(1000 nm) substrates, to investigate the evolution of the interface roughness and exchange bias and their dependence on the NiFe layer thickness. The interface roughness values of the samples decrease with increasing NiFe thickness. The in-plane ferromagnetic resonance measurements indicate that the exchange bias field and the peak-to-peak line widths of the resonance curves are inversely proportional to the NiFe thickness. Furthermore, both the exchange bias field and the interface roughness show almost the same dependence on the NiFe layer thickness. The out-of plane angular dependent measurements indicate that the exchange bias arises predominantly from a variation of exchange anisotropy due to changes in interfacial structure. The correlation between the exchange bias and the interface roughness is discussed.
Methods of symbolic anthropology and Manchester schools in Uzbek contemporary ethnology
Sattarov Ramis 중앙대학교 외국학연구소 2014 외국학연구 Vol.- No.30
Since Uzbekistan gained its independence in 1991, important cultural changes have taken place. The processes of globalization have since then increased the income of new spiritual ideas and created a synthesis between native forms of indigenous healing, as well as new samples from the culturally and regionally diverse populations of CIS countries and the world as a whole. This article aims to contribute to the discussions on social issues and their 'contents' in light of the urbanization process in Tashkent. The main argument is that social actions within urban shamanism maintain the everyday spiritual needs of the community. The analysis focuses specifically on practices of solving problems related to family, as well as marital, financial, and big eye effect issues. It shows how these practices help people and modify the context of Tashkent in light of applying methods of symbolic anthropology and Manchester schools in local field research.
Sezer Erdem,Beyhan Erdem,Ramis Mustafa Öksüzo lu,Alime Ç tak 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
Bifunctional Fe-SBA-15-SO3H mesoporous materials with different Si/Fe molar ratios (3, 5, and 7) have been synthesized via a simple direct hydrothermal method and characterized by XRD, N2-adsorption/desorption, TG/DTG and FT-IR techniques, and used as solid acid catalysts in the esterification of lactic acid with methanol. XRD and N2 sorption characterizations show successful iron doping within the mesoporous channels of SBA-15-SO3H. The FT-IR and TG/DTG characterizations also reveal the presence of iron. With the incorporation of Fe ions into the SBA-15-SO3H, the acid sites substantially increased because of the selfseparated acidity of the hydrolysis of Fe3+ solutions. However, in the Si/Fe = 3 molar ratio, the catalytic conversion decreased which is caused by the reduced cooperation effect between the acid pairs due to the weakened hydrogen bonds and collapse of the pore structure. This further suggests that the mesoporous structure decreases with the decrease in Si/Fe ratio.
Ethylene from renewable ethanol: Process optimization and economic feasibility assessment
Martina Frosi,Antonio Tripodi,Francesco Conte,Gianguido Ramis,Nader Mahinpey,Ilenia Rossetti 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
At present, ethylene is the most widely produced organic compound in the chemical industry. The maincommercial way to obtain ethylene is by steam cracking of a wide range of hydrocarbon feedstocks, butbiomass-derived ethanol can be catalytically dehydrated as a sustainable alternative route in order toexploit new renewable sources. The aim of this work is to design an optimal bioethanol-tobioethyleneplant, with a capacity of 445,652 ton/year, and to assess its economic feasibility. This designfeatures an improved production capacity and intensified energy management. The main novelty of this study is the use of diluted bioethanol solutions, bypassing the energy intensiveand expensive dehydration step. Moreover, while the first industrial bioethanol-to-bioethylene processuses NaOH to purify the outcoming flow from CO2, this plant uses diluted Methyldiethanolamine(MDEA), regenerated in situ. With this plant, the double of the capacity of the Braskem’s plant, nowthe largest one, can be reached in an environmentally more sustainable manner. A pinch analysis was performed, in order to minimize the energy consumption of the process by optimizingthe heat recovery systems. The economic analysis of the process consists of the evaluation of thetotal cost of the plant (TOC) including the sum of the CAPital EXpenditures (CAPEX) and the OPeratingones (OPEX), together with some sensitive profitability indexes (net yearly profit, net present value,net rate of return and cash flow analysis). The designed process presents an economically competitivesolution compared to the current bioethylene production units. Assuming a premium price of between 0.293 $/kg for diluted bioethanol, the proposed plant is competitivewith the lowest production cost for bioethylene (Brazil and India), while a sensitivity analysis ondiluted bioethanol price evidenced that this option remains competitive still in Europe with a bioethanolcost 0.65 $/kg.
Antonio Tripodi,Dario Manzini,Matteo Compagnoni,Gianguido Ramis,Ilenia Rossetti 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
The feasibility and performance of different strategies to purify a complex mixture of H2O/CH3CN/NH3/HCN from bioethanol ammoxidation are compared. Dichloromethane as entrainer is taken as a base case and compared with more sustainable molecules, such as ethyl acetate (EA), ethylene glycol (EG) and glycerol (G). The thermodynamic behavior of the homogeneous or heterogeneous mixtures is first discussed. Then, the separation and purification section is designed accordingly. To yield high-purity acetonitrile a low-boiling entrainer (EA) is preferable. If economic issues prevail, then EG grants a lighter sizing of the equipment and lower heat duties. Similar recoveries of acetonitrile, ranging from 90 (EG and G) to 92% (DCM and EA) were achieved when comparing the different entrainers. Higher purities are obtained with the lower-boiling additives with respect to acetonitrile, leading to purity >99.99% for DCM and EA, >99.6% for EG and >99% for G. This acetonitrile purification section is part of a full integrated plant, newly designed for the production of this commodity from renewable sources, since no commercial examples of bioethanol-to-acetonitrile plants are disclosed in the literature.
Erdem, Sezer,Erdem, Beyhan,Oksuzoglu, Ramis Mustafa,Citak, Alime Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
Bifunctional Fe-SBA-15-$SO_3H$ mesoporous materials with different Si/Fe molar ratios (3, 5, and 7) have been synthesized via a simple direct hydrothermal method and characterized by XRD, $N_2$-adsorption/desorption, TG/DTG and FT-IR techniques, and used as solid acid catalysts in the esterification of lactic acid with methanol. XRD and $N_2$ sorption characterizations show successful iron doping within the mesoporous channels of SBA-15-$SO_3H$. The FT-IR and TG/DTG characterizations also reveal the presence of iron. With the incorporation of Fe ions into the SBA-15-$SO_3H$, the acid sites substantially increased because of the self-separated acidity of the hydrolysis of $Fe^{3+}$ solutions. However, in the Si/Fe = 3 molar ratio, the catalytic conversion decreased which is caused by the reduced cooperation effect between the acid pairs due to the weakened hydrogen bonds and collapse of the pore structure. This further suggests that the mesoporous structure decreases with the decrease in Si/Fe ratio.
Miguel Angel Climent-Llorca,Marina Miro-Oca,Pedro Poveda-Martinez,Jaime Ramis-Soriano 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.6
The aim of this work was to provide further confirmation of the possible use of non-linear ultrasonic techniques for detecting the cracking due to corrosion of steel reinforcements in concrete. To this end accelerated steel corrosion tests have been conducted on model reinforced cement mortar specimens, while monitoring the appearance and width evolution of visible surface cracks, and performing non-linear ultrasonic measurements based on the phenomena of harmonic distortion and intermodulation. A new parameter, based on the difference between the amplitude of the fundamental frequency and the sum of the amplitudes of all the first-order and second-order intermodulation products, has been proposed in this work. The results confirm that the appearance of visible surface micro-cracks are preceded and accompanied by the observation of strong non-linear features in the received signal. Furthermore, the new parameter proposed in this work is as efficient as the relative non-linearity parameters, classically used in harmonic distortion non-linear ultrasonic studies, for detecting the non-linear features associated with the critical events of the cracking of cement mortar due to embedded steel corrosion. A hypothesis has been developed considering the possible effect of the filling of the void space by liquid containing rust products after the formation of new cracks or the enlargement of its width. This filling process, which might be particularly enhanced by net convective transport of liquid, would explain the evolution of the values of all the parameters used for putting in evidence the non-linear elastic features after the critical events of the cracking process.
Paraneoplastic Limbic Encephalitis in a Male with Squamous Cell Carcinoma of the Lung
Tamara Sauri,Àngel Izquierdo,LLuis Ramió-Torrentà,Àngel Sanchez-Montañez,Joaquim Bosch-Barrera,Rut Porta 대한신경과학회 2015 Journal of Clinical Neurology Vol.11 No.1
Background Paraneoplastic limbic encephalitis (PLE) is a rare syndrome characterized bymemory impairment, symptoms of hypothalamic dysfunction, and seizures. It commonly precedes the diagnosis of cancer. Small-cell lung cancer is the neoplasm that is most frequently reported as the etiology underlying PLE. Case Report This report describes a male patient who presented with neurologic symptomsconsistent with anterograde amnesia, apathy, and disorientation. MRI revealed diffuse hyperintensities located predominantly in the medial bitemporal lobes, basal ganglia, frontal lobes, andleptomeninges on fluid attenuated inversion recovery images, suggesting PLE. Study of the primary tumor revealed squamous cell carcinoma of the lung. The patient was treated with neoadjuvant chemotherapy followed by surgery and adjuvant chemoradiotherapy, which resulted in hisneurologic symptoms gradually improving. Conclusions PLE might be a rare debut of squamous cell carcinoma of the lung. Treatment ofthe primary tumor may improve the neurologic symptoms.