Gahramanov I.,Max Planck Institute for Physics |
Gahramanov I.,Azerbaijan Academy of Sciences |
Gahramanov I.,Khazar University |
Tezgin K.,University of Connecticut
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2016
Recently, it was realized that nonperturbative instanton effects can be generated to all orders by perturbation theory around a degenerate minima via the Dunne-Ünsal relation in several quantum mechanical systems. In this work we verify the Dunne-Ünsal relation for resonance energy levels of one-dimensional polynomial anharmonic oscillators. We show that the relation is applicable to cubic and quartic anharmonic oscillators which are genus-one potentials. However for higher order (higher genus) anharmonic potentials the relation is not satisfied and is subject to a certain extension. © 2016 American Physical Society.
Agency: European Commission | Branch: FP7 | Program: CP-FP-SICA | Phase: SSH.2013.4.1-1 | Award Amount: 2.04M | Year: 2014
ISSICEU analyses sources of stability and instability in the Caucasus regarding political regimes, civic participation, economic interdependencies and neighbourhood influences. We evaluate the implications for military, political, economic and societal security. We deliver three relevant products for EU policy formulation: We analyse and map emerging conflicts of local, regional and international dimensions and highlight crucial actors and mechanisms. We elaborate on scenarios concerning potential future security developments. We give concise policy recommendations on opportunities for the EU to influence conflict solution and long-term stability in the Caucasus societies and the whole region. ISSICEU disseminates the findings as follows: policy briefs; expert workshops in relevant EU agencies and for stakeholders in EU countries and the Caucasus; a scenario-workshop at the final stage. ISSICEU explores intra-societal frictions and their regional impact in the political regimes focussing mainly on dynamics of communal governance; the interplay of religious and state actors and practices of civic participation. We analyse inter-societal sources of (in)stability regarding economic dependencies; political and societal relations between the Caucasus and neighbourhood states. ISSICEU makes comparative analyses across sub-regions and studies aspects of inter-societal relations. We consider the historical and contemporary ties among the societies. We study the Caucasus in its diversity and cohesiveness. Cases are Armenia, Azerbaijan, Georgia, Abkhazia, South Ossetia, Nagorno-Karabakh, Dagestan, Kabardino-Balkaria, Karachay-Cherkessia and Chechnya. In the neighbourhood we focus on Turkey and Iran. ISSICEU takes theory-informed, interdisciplinary and strongly inductive approaches, able to adequately identify phenomena as they manifest themselves in the region and to give innovative policy recommendations.
Sahmurova A.,Okan University |
Sahmurova A.,Khazar University |
Shahmurzada B.,Kocaeli University
Polish Journal of Environmental Studies | Year: 2016
This study measured trace elements and assessed fluoride levels in groundwater in Azerbaijan. We investigated endemic diseases in regions of Azerbaijan using the aforementioned data. Geographic regions were classified as an endemic region or not by using a support vector machine (SVM). Classification accuracy for the SVM classifier was determined to be 76.92%. © 2016, HARD Publishing Company. All rights reserved.
Habashi M.S.,Shiraz University |
Zarei M.M.,Khazar University |
Moreno-Atanasio R.,University of Newcastle
Society of Petroleum Engineers - SPE Annual Caspian Technical Conference and Exhibition, CTCE 2015 | Year: 2015
The objective of this paper is to present a co-precipitation technique with calcium carbonate for removal of heavy metals ions from oil field brine. Metals such as Mercury, Copper and Lead can be removed by the co-precipitation technique. In this work, parameters such as pH, injection time and concentration of reactants were optimized in other to obtain maximum removal efficiency. The results showed that pH has a significant effect while the injection time and reactant concentrations were less effective to remove the metals. Based on the SEM, ICP and hydrometer analysis, the optimum experimental conditions were the pH of 10, the injection time of 20 min and the reactant concentration of 0.5 mol percent. Approximately, more than 90 percent of mercury, lead and copper was removed employing co-precipitation techniques with calcium carbonate. Scanning Electron Microscopy analysis indicates that 200 rpm is the optimum rotational speed which leads to the formation of small particles. Finally, this study showed especially that the co-precipitation technique is a good alternative to remove the heavy metals especially mercury from the contaminated oil field brine. Copyright 2015, Society of Petroleum Engineers.
Modarres A.,Tarbiat Modares University |
Nejad F.M.,University of Tehran |
Kavussi A.,Tarbiat Modares University |
Hassani A.,Tarbiat Modares University |
Shabanzadeh E.,Khazar University
Construction and Building Materials | Year: 2011
There are not enough information about the fatigue characteristics of cold recycled mixes with bitumen emulsion and cement. In this research with the purpose of studying the fatigue characteristics of these mixes and determining the effects of different parameters, several laboratory recycled specimens containing CSS-1h bitumen emulsion and two types of cements (type I and I (PM) pozzolanic cement) have been prepared and tested. The main laboratory tests consisted of resilient modulus and indirect tensile fatigue test. After curing specimens in laboratory conditions, specimens were tested at three different temperatures and curing times. For each recycled specimen, studied parameters consisted of cement type, cement content, test temperature and curing time. According to obtained results, by increasing cement content and decreasing temperature, the slope of fatigue line will be decreased but no considerable change in fatigue behavior was occurred upon increasing the curing time. Furthermore, in comparison with reference specimens (i.e. specimens with no cement) and type I cement specimens, I (PM) cement had the mean fatigue behavior. At low initial strain levels, the fatigue life of I (PM) cement specimens were more than reference specimens and less than type I cement, whereas at high initial strain levels, the fatigue life of I (PM) cement specimens were more than type I cement and less than the reference specimens. © 2010 Elsevier Ltd. All rights reserved.
Kasaai M.R.,Khazar University
Carbohydrate Polymers | Year: 2010
Up to know, several methods have been developed to determine degree of N-acetylation, DA, for chitin and chitosan. In this article, an effort has been made to review the available literature information on the DA for the two biopolymers by different techniques of nuclear magnetic resonance, NMR (1H NMR, 13C NMR, and 15N NMR) spectroscopy. This article describes the effects of various parameters and different compounds as impurities of the original polymers (moisture, minerals, proteins, and pigments) on the accuracy of the DA values. This study allows one to choose an appropriate technique to determine the DA for the two polymers. These techniques have been compared for their performances and limitations. Among various NMR spectroscopy techniques, 1H NMR is the most sensitive and precise technique and results in the most accurate data. 13C NMR and 15N NMR techniques have been employed for entire range of the DA. © 2009 Elsevier Ltd. All rights reserved.
Maghsoudlou E.,Khazar University |
Esmaeilzadeh Kenari R.,Khazar University |
Raftani Amiri Z.,Khazar University
Journal of Food Processing and Preservation | Year: 2016
This study was carried out to determine the antioxidant activity of pulp (P) and skin (S) extract of two fig varieties of figs (Sabz(G) and Siyah(B)) by subcritical water extraction. The antioxidant activity of the extracts was evaluated by using 2,2'-diphenyl-1-picryl hydrazyl radical, reducing power and rancimat tests. The Siyah variety contained higher levels of polyphenols and flavonoids in comparison with Sabz variety. Generally, Siyah variety revealed higher levels of phenolic compounds and flavonoids. Moreover, the lowest IC50 in DPPH tests and reducing power was related to Siyah fig skin extract, and rancimat test showed no significant difference between antioxidant activity of fig extracts. The efficiency of Siyah fig skin extract for oxidative stability was assessed using peroxide, thiobarbituric acid, conjugate dien, acid value and color indicator in canola oil, compared with synthetic antioxidants of tert-Butylhydroquinone (TBHQ). The results showed that Siyah skin extract had the highest antioxidant activity and were comparable with TBHQ. Furthermore, skin of Siyah fig variety can be considered as a good source of phenolic compounds. Practical Applications: Several novel techniques, notably subcritical water extraction, have been developed for the extraction of natural antioxidants from plants in order to shorten the extraction time, decrease the organic solvent consumption and increase the quality of extracts. One of the most important applications of natural antioxidants is retardation or inhibition of oil oxidation. This paper reveals that the natural extracts have antioxidant activity comparable to that of synthetic antioxidants used in oil industry. Therefore, skin of Siyah fig extract can be used to replace synthetic antioxidants. © 2016 Wiley Periodicals, Inc.
Han S.,Laurentian University |
Auger C.,Laurentian University |
Appanna V.P.,Laurentian University |
Lemire J.,Laurentian University |
And 3 more authors.
Journal of Microbiological Methods | Year: 2012
As glutamate and ammonia play a pivotal role in nitrogen homeostasis, their production is mediated by various enzymes that are widespread in living organisms. Here, we report on an effective electrophoretic method to monitor these enzymes. The in gel activity visualization is based on the interaction of the products, glutamate and ammonia, with glutamate dehydrogenase (GDH, EC: 18.104.22.168) in the presence of either phenazine methosulfate (PMS) or 2,6-dichloroindophenol (DCIP) and iodonitrotetrazolium (INT). The intensity of the activity bands was dependent on the amount of proteins loaded, the incubation time and the concentration of the respective substrates. The following enzymes were readily identified: glutaminase (EC: 22.214.171.124), alanine transaminase (EC: 126.96.36.199), aspartate transaminase (EC: 188.8.131.52), glycine transaminase (EC: 184.108.40.206), ornithine oxoacid aminotransferase (EC: 220.127.116.11), and carbamoyl phosphate synthase I (EC: 18.104.22.168). The specificity of the activity band was confirmed by high pressure liquid chromatography (HPLC) following incubation of the excised band with the corresponding substrates. These bands are amenable to further molecular characterization by a variety of analytical methods. This electrophoretic technology provides a powerful tool to screen these enzymes that contribute to nitrogen homeostasis in Pseudomonas fluorescens and possibly in other microbial systems. © 2012 Elsevier B.V..
Muradkhanli L.G.,Khazar University
2011 5th International Conference on Application of Information and Communication Technologies, AICT 2011 | Year: 2011
The article considers an analysis of the delivery methods using traditional learning, eLearning, and blended learning. Analysis of the comparison between traditional learning and eLearning has been done. The characteristics and benefits of blended learning are analyzed. Blended learning course development steps are described. © 2011 IEEE.
Kasaai M.R.,Khazar University
International Journal of Food Properties | Year: 2014
Water is a major component of drinking water, beverages, and most foodstuffs. In this study, an effort has been made to employ selected properties of water for: (1) evaluation of interactions of water with other food components; (2) discussion on the effects of water properties on food and beverage products; (3) applications of water properties in food technology; and (4) comparison of water properties with corresponding properties of similar substances. This study provides the following major conclusions: (i) unusual properties of water are mostly due to its high permanent dipole moment, partial ionic character of O-H covalent bonds, and extensive hydrogen bonds; (ii) different properties of many foodstuffs are strongly related to various properties of water; (iii) the properties of food products change depending on water availability and temperature; (iv) preparation of drinking water is a prerequisite for production of any safe drinks and foodstuffs; (v) water contributes important roles in quality, flavor, and shelf-life of foods; and (vi) water is used in food industries as a fluid for heat transfer; as a medium for temperature moderation in food processing; as a solvent for sugars, salts, water-soluble vitamins, and acids; as a dispersing agent for hydrophilic food components; as a dispersed phase for emulsified products; or as a reactant for several reactions in food processing. Copyright © Taylor and Francis Group, LLC.