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Site effect microzonation of Babol, Iran
Tavakoli, H.R.,Amiri, M. Talebzade,Abdollahzade, G.,Janalizade, A. Techno-Press 2016 Geomechanics & engineering Vol.11 No.6
Extensive researches on distribution of earthquake induced damages in different regions have shown that geological and geotechnical conditions of the local soils significantly influence behavior of alluvial areas under seismic loading. In this article, the site of Babol city which is formed up of saturated fine alluvial soils is considered as a case study. In order to reduce the uncertainties associated with earthquake resistant design of structures in this area (Babol city), the required design parameters have been evaluated with consideration of site's dynamic effects. The utilized methodology combines experimental ground ambient noise analysis, expressed in terms of horizontal to vertical (H/V) spectral ratio, with numerical one-dimensional response analysis of soil columns using DEEPSOIL software. The H/V spectral analysis was performed at 60 points, experimentally, for the region in order to estimate both the fundamental period and its corresponding amplification for the ground vibration. The investigation resulted in amplification ratios that were greater than one in all areas. A good agreement between the proposed ranges of natural periods and alluvial amplification ratios obtained through the analytical model and the experimental microtremor studies verifies the analytical model to provide a good engineering reflection of the subterraneous alluviums.
Brønsted Acidic Ionic Liquids as Efficient Catalysts for Clean Synthesis of Carbamatoalkyl Naphthols
Tavakoli-Hoseini, Niloofar,Heravi, Majid M.,Bamoharram, Fatemeh F.,Davoodnia, Abolghasem Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.3
Under mild conditions and without any additional organic solvent, synthesis of carbamatoalkyl naphthols could be carried out in the present of two halogen-free Br${\phi}$nsted acidic ionic liquids, 3-methyl-1-(4-sulfonic acid)butylimidazolium hydrogen sulfate and N-(4-sulfonic acid)butylpyridinium hydrogen sulfate. A wide range of aromatic aldehydes easily undergo condensation with $\beta$-naphthol and methyl or benzyl carbamate to afford the desired products of good purity in excellent yields. The present methodology offers several advantages such as a simple procedure with an easy work-up, short reaction times, and excellent yields. The catalysts could be recycled and reused for several times without substantial reduction in their catalytic activities.
SOME NEW RESULTS ON IRREGULARITY OF GRAPHS
Tavakoli, M.,Rahbarnia, F.,Ashra, A.R. The Korean Society for Computational and Applied M 2014 Journal of applied mathematics & informatics Vol.32 No.5
Suppose G is a simple graph. The irregularity of G, irr(G), is the summation of imb(e) over all edges $uv=e{\in}G$, where imb(e) = |deg(u)-deg(v)|. In this paper, we investigate the behavior of this graph parameter under some old and new graph operations.
Tavakoli, Hamid Reza,Moosavi, Sayed Mojtaba,Bazgir, Ayoob Korean Chemical Society 2013 대한화학회지 Vol.57 No.2
An efficient and environmentally benign protocol for the pseudo four-component synthesis of benzopyranopyrimidines via condensation of salicylic aldehydes, malononitrile and various amines catalyzed by $ZrOCl_2{\cdot}8H_2O$ as an inexpensive and eco-friendly catalyst with high catalytic activity under solvent-free conditions is reported. This protocol provides a new and improved method for obtaining benzopyranopyrimidines in terms of good yields, simple experimental procedure and short reaction time.
Tavakoli, Mohammad Reza Bank,Vahidi, Behrooz The Korean Institute of Electrical Engineers 2011 Journal of Electrical Engineering & Technology Vol.6 No.6
The performance of transmission lines and its shielding design during a lightning phenomenon are quite essential in the maintenance of a reliable power supply to consumers. The leader progression model, as an advanced approach, has been recently developed to calculate the shielding failure rate (SFR) of transmission lines using geometrical data and physical behavior of upward and downward lightning leaders. However, such method is quite time consuming. In the present paper, an effective method that utilizes artificial neural networks (ANNs) to create a metamodel for calculating the SFR of a transmission line based on shielding angle and height is introduced. The results of investigations on a real case study reveal that, through proper selection of an ANN structure and good training, the ANN prediction is very close to the result of the detailed simulation, whereas the Processing time is by far lower than that of the detailed model.
THE VERTEX AND EDGE PI INDICES OF GENERALIZED HIERARCHICAL PRODUCT OF GRAPHS
Tavakoli, M.,Rahbarnia, F. The Korean Society for Computational and Applied M 2013 Journal of applied mathematics & informatics Vol.31 No.3
Pattabiraman and Paulraja [K. Pattabiraman, P. Paulraja, Vertex and edge PI indices of the generalized hierarchical product of graphs, Discrete Appl. Math. 160 (2012) 1376- 1384] obtained exact formulas for the vertex and edge PI indices of generalized hierarchical product of graphs. The aim of this note is to improve the main results of this paper.
Ideal nasal preferences: A quantitative investigation with 3D imaging in the Iranian population
Tavakoli Kiarash,Sazgar Amir Keyvan,Hasanzade Arman,Sazgar Amir Arvin 대한성형외과학회 2023 Archives of Plastic Surgery Vol.50 No.4
Background Though in facial plastic surgery, the ideal nasal characteristics are defined by average European-American facial features known as neoclassical cannons, many ethnicities do not perceive these characteristics as suitable. Methods To investigate the preferences for nasofrontal angle, nasolabial angle, dorsal height, alar width, and nasal tip projection, manipulated pictures of one male and one female model were shown to 203 volunteer patients from a tertiary university hospital’s facial plastic clinic. Results The most aesthetically preferred nasofrontal angles were 137.64 ± 4.20 for males and 133.55 ± 4.53 for females. Acute nasofrontal angles were more desirable in participants aged 25 to 44. The most preferred nasolabial angles were 107.56 ± 5.20 and 98.92 ± 4.88 respectively. Volunteers aged 19 to 24 preferred more acute male nasolabial angles. A straight dorsum was the most desirable in both genders (0.03 ± 0.78 mm and 0.26 ± 0.75 mm, respectively). The ideal male and female alar widths were -0.51 ± 2.26 mm and -1.09 ± 2.18 mm, respectively. More 45- to 64-year-old volunteers preferred alar widths equal to intercanthal distance. The ideal female and male tip projections were 0.57 ± 0.01 and 0.56 ± 0.01, respectively. Conclusions Results indicate that the general Iranian patients prefer thinner female noses with wider nasofrontal angles for both genders. However, the ideal nasolabial angles, dorsal heights, and tip projections were consistent with the neoclassical cannons. Besides ethnic differences, the trend of nasal beauty is also affected by gender, age, and prior history of aesthetic surgery.
Tavakoli, Hamid Reza,Moosavi, Sayed Mojtaba,Bazgir, Ayoob Korean Chemical Society 2013 대한화학회지 Vol.57 No.4
An efficient and environmentally benign protocol for the three-component synthesis of triazoloindazoles and indazolophthalazines via condensation of dimedone, aldehydes and urazole or phthalhydrazide catalyzed by $ZrOCl_2.8H_2O$ as an inexpensive and eco-friendly catalyst with high catalytic activity under solvent-free conditions is reported. This protocol provides a new and improved method for obtaining triazoloindazoles and indazolophthalazines in terms of good yields, simple experimental procedure and short reaction time.
Optimizing the Atomic Force Microscopic Parameters for Submicron IDT Patterns
Mohammad Tavakoli,Hassan Hajghassem,Massoud Dousti,Ameneh Habibzadeh 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.11
The experimental results of submicron lithography for making interdigital transducers (IDTs) by using an atomic force microscope (AFM) is presented in this work. The AFM is used in the tapping mode. For the transfer of high-quality patterns, three operational parameters, the probe speed, the distance from the surface to the tip, and the tip force applied on the device are shown to be important controlling parameters. Understanding and controlling the effects of these parameters during lithography would help to transfer high-quality submicron IDT pattern on the substrate. We show that aluminum IDT electrodes with 807nm widths can be directly patterned on Si substrates. Because the requirement is eliminated in the AFM lithography process, transferring the pattern of a submicron IDT is convenient and more accurate.