March 2012
Vibration analysis in the design and construction of an acoustic guitar
One of the main problems encountered in developing and building an acoustic guitar is to establish a formal methodology that allows us to observe the impact of some parameters involved in the process. This paper propose a modal analysis in the different stages of construction, and it is performed by -a finite element analysis of the soundboard of the instrument according to the relationship that that have...
March 2012
Cu(II) and Fe(III) complexes of sulphadoxine mixed with pyramethamine: Synthesis, characterization, antimicrobial and toxicology study
Two new mixed ligands metal complexes of sulphadoxine and pyramethamine were prepared by using CuCl2.6H2O and FeCl3.6H2O. The complexes were characterized by elemental analysis, melting point determination, molar conductivity, metal content analysis (AAS), IR, magnetic susceptibility measurements and UV-Visible spectroscopy. Based on the analytical and spectroscopic data, the complexes were proposed to have...
March 2012
A study on the electronic and structural properties of fullerene C36 and it’s interaction with amino acid
C36 is the most important fullerene cage. In this paper, the structural properties of C36fullerene interacting with glycine radicals are analyzed through the density functional theory. The radical adsorptions result in modifications on the structural properties of the original fullerene. It was found out that the binding of glycine to C36 generated a slightly unstable complex. This indicates that...
March 2012
NMR and NBO calculation of benzimidazoles and pyrimidines: Nano physical parameters investigation
Six theoretical methods were used for the calculation of physical parameters for derivatives of pyrimidines and benzimidazols. We used Gaussian 98 at NMR and NBO calculations by using HF method with 6-31G, 6-31G* and 6-31+G basis set and B3LYP, BLYP and B3PW91 methods with 6-31G basis set. Chemical shift was drawn curve for all of the atoms in each molecule. The thermo chemical parameters including thermal...
March 2012
Chebyshev methods for the numerical solution of fourth-order differential equations
We consider in this paper the application of Chebyshev polynomials in solving fourth-order differential equations and trial solution constructed as Chebyshev form of Fourier cosine series is employed. Also, formula which enables both sides of the differential equations to be expressed as sum of Chebyshev polynomials is derived. As a means of finding the numerical values of the approximant, collocation and...
March 2012
Mapping the structure, evolution and geo-spatiality of a social media network
Social media is the baby born out of the confluence of digital technology and human beings' desire to collaborate. Past researches in social media networks have mostly concentrated on investigation of large networks, which do not fully capture the micro-level dynamics of the network. In this study, an in-depth topological analysis of a small network (n=200) formed on Twitter during a 24 h period was...
March 2012
Green Information Technology (IT) framework for energy efficient data centers using virtualization
The increasing demand for storage, networking and computation has driven the escalation of large complex data centers, the massive server farms that run many of today’s Internet, financial, commercial and business applications. A data center can comprise many thousands of servers and can use as much energy as a small city. The massive amounts of computation power required to drive these server systems...
March 2012
A new method based on distributed learning automata for page ranking in web
With the growing information in the web, ranking algorithms is very important in searching information. Currently, there are two categories of the ranking algorithm based on contentand connectivity. Ranking algorithms which are based on content have low accuracy and recall and also contain the rank spamming problem. Ranking...
March 2012
A technique to overcome the problem of small size database for automatic speaker recognition
Modeling a system by statistical methods needs large amount of data to train the system. In real life, such data are sometimes not available or hard to collect. Modeling the system with small size database will produce a system with poor performance. In this paper, a method for increasing the size of a speech database is proposed. The method works by generating new samples from the original samples, using...
March 2012
A novel method for improving the efficiency of automatic construction of ontology from a relational database
With the development of the semantic web, ontology is playing an increasingly important role in many research areas such as semantic interoperability and knowledge base. However, constructing ontology manually is complicated and needs the supports of domain experts in knowledge acquisition as well, so it is time-consuming, error-prone and tedious-work. Learning ontology from existing resources is a good...
March 2012
Synthesis and preliminary characterization of polyethylene glycol (PEG)/hydroxyapatite (HAp) nanocomposite for biomedical applications
Currently, composite materials have gained momentum in the field of orthopedics and maxillofacial surgery. Among the composite materials, ceramic/polymer possesses significant advantages of high mechanical reliability and excellent biocompatibility for applications in load bearing areas. In this work, polyethylene glycol (PEG)/hydroxyapatite (HAp) nanocomposites of varying weight percentages were synthesized...
March 2012
Effect of substrate temperature on physical properties of In2O3:Sn films deposited by e-beam technique
Indium tin oxide (ITO) thin films were prepared by electron beam evaporation at different substrate temperatures. The structural studies were carried out by X-ray diffraction. Optical properties of the films were studied in the ultraviolet-visible-near infrared (UV-Vis-NIR) region (200 to 2500 nm). Electrical studies were carried out at room temperature of ITO films. The results showed that with increase in...
March 2012
Evaluation of ethanol gas sensing properties of ZnO nanopowder doped with Cu and Fe
Zinc oxide (ZnO) is one of the most important metal oxides having various applications in gas sensors. In the present work, ZnO nanoparticles were synthesized via sol-gel method. The nanopowder was then hydraulic-pressed and pre-sintered at 400°C to be molded into tablets with radius of 13 mm and thickness of 1.4 mm. Then, the sensor characteristics of ZnO nanopowder tablets were evaluated with respect to...
March 2012
Effect of discontinuities on the stability of rock blocks in tunnel
This paper presents the results of an investigation that was carried out using important parameters, such as discontinuities in forming rock block and instability in tunnel. Discontinuities like bedding and joints are one of the most important factors when compared with parameters, such as engineering features of rock mass. In this review, numerous features like rock quality designation (RQD), rock...
March 2012
During the sustainable physical planning processes, the visual landscape quality of Turkish provinces (Ağrı and Iğdır)
In Turkey, landscape planning has no legal status within the physical planning processes. Landscape planning approaches were used in some environment plans, long-term national park development plans, and sectoral plans like Wetland Management plans. Works on the assessment of visual landscape quality (VLQ) are required for both landscape planning and the determination of landscape quality...
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