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Search Results: 1 - 10 of 144711 matches for " Azar B. Eyvazov "
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Enhanced and continuous electrostatic carrier doping on the SrTiO$_{3}$ surface
Azar B. Eyvazov,Isao H. Inoue,Pablo Stoliar,Marcelo J. Rozenberg,Christos Panagopoulos
Physics , 2013, DOI: 10.1038/srep01721
Abstract: Paraelectrical tuning of a charge carrier density as high as 10$^{13}$\,cm$^{-2}$ in the presence of a high electronic carrier mobility on the delicate surfaces of correlated oxides, is a key to the technological breakthrough of a field effect transistor (FET) utilising the metal-nonmetal transition. Here we introduce the Parylene-C/Ta$_{2}$O$_{5}$ hybrid gate insulator and fabricate FET devices on single-crystalline SrTiO$_{3}$, which has been regarded as a bedrock material for oxide electronics. The gate insulator accumulates up to $\sim10^{13}$cm$^{-2}$ carriers, while the field-effect mobility is kept at 10\,cm$^2$/Vs even at room temperature. Further to the exceptional performance of our devices, the enhanced compatibility of high carrier density and high mobility revealed the mechanism for the long standing puzzle of the distribution of electrostatically doped carriers on the surface of SrTiO$_{3}$. Namely, the formation and continuous evolution of field domains and current filaments.
A Supercooled Spin Liquid State in the Frustrated Pyrochlore Dy2Ti2O7
Ethan R. Kassner,Azar B. Eyvazov,Benjamin Pichler,Timothy J. S. Munsie,Hanna A. Dabkowska,Graeme M. Luke,J. C. Séamus Davis
Physics , 2015, DOI: 10.1073/pnas.1511006112
Abstract: A "supercooled" liquid develops when a fluid does not crystallize upon cooling below its ordering temperature. Instead, the microscopic relaxation times diverge so rapidly that, upon further cooling, equilibration eventually becomes impossible and glass formation occurs. Classic supercooled liquids exhibit specific identifiers including microscopic relaxation times diverging on a Vogel-Tammann-Fulcher (VTF) trajectory, a Havriliak-Negami (HN) form for the dielectric function, and a general Kohlrausch-Williams-Watts (KWW) form for time-domain relaxation. Recently, the pyrochlore Dy2Ti2O7 has become of interest because its frustrated magnetic interactions may, in theory, lead to highly exotic magnetic fluids. However, its true magnetic state at low temperatures has proven very difficult to identify unambiguously. Here we introduce high-precision, boundary-free magnetization transport techniques based upon toroidal geometries and gain a fundamentally new understanding of the time- and frequency-dependent magnetization dynamics of Dy2Ti2O7. We demonstrate a virtually universal HN form for the magnetic susceptibility, a general KWW form for the real-time magnetic relaxation, and a divergence of the microscopic magnetic relaxation rates with precisely the VTF trajectory. Low temperature Dy2Ti2O7 therefore exhibits the characteristics of a supercooled magnetic liquid; the consequent implication is that this translationally invariant lattice of strongly correlated spins is evolving towards an unprecedented magnetic glass state, perhaps due to many-body localization of spin.
Investigation of genetic heterogeneity in Mycobacterium tuberculosis isolates from tuberculosis patients using DNA fingerprinting
Khosravi Azar,Barazandeh B
Indian Journal of Medical Sciences , 2005,
Abstract: BACKGROUND: DNA fingerprinting of Mycobacterium tuberculosis (MTB) based on IS6110 has been shown to be a powerful epidemiologic tool. Restriction enzyme analysis (REA) is a fingerprinting technique, which is used for differentiation and investigation of genetic diversity among mycobacterial species. AIMS: To investigating the genetic heterogeneity in MTB isolates in Ahvaz, Iran. SETTINGS AND DESIGN: It was a cross-sectional study conducted in Ahvaz, Iran. METHODS AND MATERIAL: One hundred and eighty clinical isolates of MTB were collected from TB reference unit, PHLS, Ahvaz, Iran. The PCR-REA employed uses a simple DNA extraction followed by a PCR step involving a single primer based on the insertion sequence IS6110. Restriction enzyme analysis was performed on the amplification products using HaeIII enzyme. STATISTICAL ANALYSIS: Data was analyzed using SPSS software and chi-square test/Fishers′ exact test was applied wherever applicable. RESULTS: The isolates were divided into four clusters based on their REA patterns. Cluster I contained 71.1% of strains with two fragments of 72 and 118. Cluster II with three fragments of 72, 118, and 194; cluster III with three fragments of 118, 194, and 234; and cluster IV with four fragments of 72, 118, 194, and 234 base pairs. As many as 73.8% of the identical fingerprint patterns were seen in male patients. Accounting the men as the major population in the study, there was no significant difference between REA patterns and sex; similarly, with age, patients′ occupation and degree of smear positivity. However, we found significant correlation between REA patterns and patients′ origin. As many as 61.6% of identical patterns were found in the patients who were lived in the same suburb. CONCLUSIONS: By PCR-based REA typing, the isolates studied were grouped into four clusters each containing between two and four fragments. However, in order to ascertain the level of heterogeneity of MTB isolates in their sample, further testing with a more discriminatory method is needed.
VITAMIN CHANGES INDUCED BY X-RAY IN IRANIAN POTATOES
M. Azar,Z. Zare,B. Berahman
Iranian Journal of Public Health , 1979,
Abstract: The results of researches in the field of the using X-ray in all over the world have been successful. The main subject which needs more investigation and have been allocated part of the researches in most of the Atomic Research Institutes, is the research about possible harms of irradiated food for human beings, base on the researches, using irradiation for inhibition of sprouting and preservation of potato is recommended by the group members of scientist (IAEA) in 1976, for developing countries which have faced food deficiency. (1) Regarding to ever-increasing of population in Iran, to prevent the food wastage a comprehensive study about production, harvesting and preservation of potato was carried out in 1976. (2) Following to that an irradiation experiment of potato for inhibiting of sprouting was carried out in Iran. (3) Then the vitamin changes in potato induced by X-ray were studied. In this experiment 60 gamma radiation doses of 10, 12 and 15 krad for two varieties of potatoes were tried. The tubers were monthly determined for the following: Ascorbic acid, Thiamin -and Riboflavin. The result of this experiment pre as follow: Different doses of gamma ray and preservation times are effective 0Ill the amount of potatoes vitamin C, and this effect in both cases would be a losses about 27 to 50%; also they are effective on the thiamin and, riboflavin content of potato. This effect causes losses less in-comparison with vitamin C.
Endosonographic Evaluation of Intraductal Papillary Mucinous Tumors of the Pancreas
Soweid A,Azar C,Labban B
JOP Journal of the Pancreas , 2004,
Abstract:
Waste Related Pollutions and Their Potential Effect on Cancer Incidences in Lebanon  [PDF]
Sahar K. Azar, Safa S. Azar
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.76070
Abstract:

Pollution represents an important threat to human health. Waste pollution with its adverse health risks, mainly cancer incidences, is one of the main issues present in Lebanon. Random disposal of wastes is instilling a complex and challenging situation that is affecting the entire population. Here, a comprehensive study is presented along with collected data addressing the correlation between long-term exposure to the different forms of pollution and the chances of being affected with cancer. Lebanon, a country currently facing an extensive garbage crisis, is undergoing alarming surges in pollution rates. Inevitably, these environmental factors become chief elements in influencing disease statistics. It is therefore of urgent importance to seek all solutions possible while raising awareness in order to reduce life threatening risks.

Sedimentary Environments Can Be Changed by Geotechnology (Case Study: A Morphotectonic Idea for Design of Extensive Artificial Bay on the Iranian Plateau)  [PDF]
Mehran Arian, Azar Khodabakhshnezhad
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.65039
Abstract: Iranian Plateau between the Lesser Caucasus-Alborz Mountains on the north and Zagros-Makran Ranges on the south has several inter-mountainous depressions which were filled by Quaternary deposits. Geologic evidence implied that, the last marine conditions in some depressions such as the Dasht-e Kavir, Dasht-e Lut and Jazmourian basins, had been changed to land conditions in middle Miocene. Based on shape and elevation of the Dasht-e Kavir, Dasht-e Lut and Jazmourian plains related to sea level and geomorphology of Iranian plateau, three semi-connective artificial lakes can be constructed upon the mentioned plains by consideration of many geologic and geotechnical parameters. These artificial lakes can feed by pumping of water from Oman Sea and form a triple artificial bay which they must be connected together by two gated straits. Therefore, a possible morphotectonic idea with many advantages has suggested that it can be present as an international geotechnologic design. This design has the important environmental impacts which can be changed desert to lake sedimentary basins.
Salt Tectonics in the Southern Iran  [PDF]
Azar Khodabakhshnezhad, Mehran Arian
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.73029
Abstract: Based on geographic distribution and geological setting of salt plugs in southern Iran, three salt diapiric provinces have been distinguished. These provinces include the Hormuz, Shiraz-Kazerun and Nyriz-Jahrum sub-basins. There are more than hundred salt plugs which they have been formed and developed in the southern margin of Iran. The salt structures that originated from Hormuz formation in these areas have been restricted and separated from each other for the first time in this paper. Salt diapirism of these provinces has been triggered earlier by Halokinesis in the Zagros and Persian Gulf basins, but it has affected later by tectonic forces, because orientation, shape and position of salt plugs have been followed from convergence regime (especially in the Zagros hinterland). In the other hand, based on our results from salt plugs in Persian Gulf foreland basin and the Zagros hinterland, Halokinesis triggers has been affected more than Halotectonic forces.
The Standalone and the Portfolio Risk of the Rogers Energy Commodity Index  [PDF]
Samih Antoine Azar
Theoretical Economics Letters (TEL) , 2019, DOI: 10.4236/tel.2019.94045
Abstract: This paper tackles the rather recent weekly period from January 18, 2005 to February 28, 2018, encompassing 523 observations. The portfolio is constructed from the perspective either of a US investor or of a Lebanese one, since the US dollar foreign exchange rate was pegged during the above whole period. The portfolio consists of an investment in the US S & P 500 stock market index and in three Rogers international commodity indexes: agricultural, energy, and metals. The purpose of the paper is to estimate the diversification benefits of the energy commodity index. These benefits arise from the fall in the volatility of the investment portfolio when it is compared to an investment in the energy index only, or in the S & P 500 only. The procedure follows the seminal approach of Markowitz. The inputs of the model are the variance/covariance matrix, the average log returns, and the condition that all investment shares should sum up to 1. The outputs, obtained by matrix manipulation, are the optimal investment shares in the four assets, the volatilities of the optimal portfolios, the characteristics of the efficient frontier, the relation between portfolio shares and the expected, or required return, and finally, the predicted Capital Market Line (CML). The evidence shows that, by holding a portfolio composed of the above four assets, the volatilities are substantially reduced. Moreover, and since short sales are allowed in the model, all optimal investment shares in the energy commodity asset are negative, meaning that in the optimal portfolios the positions in the energy index are short positions. The paper points to the significantly high relative riskiness of the energy index, as a stand-alone asset, or as an aggressive and speculative investment on the CML, and to the substantial portfolio benefits of shorting this index.
Evaluation of human leukocyle antigen in Papilon Lefvre Syndrome
Mehrdad Lotf Azar,Gharesi Fard B,Fargadian Sh
Journal of Dental Medicine , 2002,
Abstract:
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