Volume 18 – Issue 2

In this paper Homotopy Analysis Method (HAM) is implemented to obtain analytical solutions of nonlinear Whitham-Broer-Kaup partial differential equations and Cauchy Reaction-diffusion problems of fractional order. Numerical results coupled with the graphical representations reveal the complete compatibility of proposed algorithm for such problems.

In this paper, the timelike ruled surfaces generated by vectors of type-2 bishop frame were investigated. Using this frame, the necessary and sufficient conditions when the ruled surfaces are developable were obtained and some new results and theorems related to be the asymptotic curve, the geodesic curve of the base curve on the ruled surfaces were gived.Also, the gaussian and the mean curvatures of timelike ruled surfaces were calculated.

In this paper, we shall use the concepts of N α-open and NSα-open sets to define some new types of weakly nano continuity such as; Nα-continuous, α*-continuous, α**-continuous, NSα-continuous, NSα*-continuous and NSα**-continuous maps. Also, we shall explain the relationships between these types of weakly nano continuity and the concepts of nano continuity. Moreover, we shall prove some theorems, properties, remarks and give counter examples about these new concepts of weakly nano continuity.

In this paper, we introduce the comparative study of errors in different functions using error formula. Some examples are also discussed. This work presents a numerical analysis of error formula. Also to check the performance of the considered method an error associated with Lagrange Interpolation has considered. Errors are analyzed by comparing the actual sampled values with the values obtained by Lagrange’s Interpolation formula

In this paper, we are studying three simulation methods to generate observation for bivariate exponential distribution, and these methods are: method 1, method 2(conditional method) and method 3, and we write simulation programs for each method by Matlab 2015a software, and comparison between these methods by depend on many criterions as MSE, AIC, skw, kur. As well as the run speed criterion for each method to get the best method.

In this paper, we express surfaces parametrically through a given spacelike (timelike) asymptotic curve using the Frenet frame of the curve in Minkowski 3-space. Necessary and sufficient conditions for the coefficients of the Frenet frame to satisfy both parametric and asymptotic requirements are derived. We also present some interesting examples to show the validity of this study.

Non-abelian structure is attracted by the cryptographers to build public key cryptosystem. In this article we proposed a new key agreement protocol based non-abelian near-rings. We show that our protocol meet the security attribute under the assumptions factor problem in centralizer near-rings and security issues also discussed.

In this article we study the metric relation of Feuerbach point and its applications in proving distance properties related to this point, we also study about Feuerbach Conic and some concurrencies and collinarities concerned about this point.

Cost minimization represents a priority for the cost accounting of the economic entities. To optimize the supply cost, the supply budget management requires the completion of several stages, namely: the study of the supply policies, the elaboration of the supply budget based on the optimal policies determined by means of the optimization templates and of the supply costs. A supply budget optimization is needed periodically, relying on two policies: the budget policy for the economic period of re-supply and the budget policy for the economic lot to be supplied. In this study we intend to highlight the importance of mathematical models used for supply cost optimization in supply budget organization and management, using determining policies.

In a world troubled by social and economic events, social responsibility is the most important competitive advantage of the organization, but also a strategic management tool to achieve its goals. Due to the multiplication of the facts of organizations in the contemporary world, there is an increase in the efforts of researchers to quantify the degree of social responsibility of organizations. Following the concerns in this respect, the authors present, by this work, two possible methods of quantitative determination of the social responsibility of the organizations, under the conditions of the influence factors considered essential (external and internal). The result of such an approach, would be the pragmatic character that we want to give to this research, which would allow theoreticians to better understand the SRO on the perception of the organization by employees and practitioners, in order of a better understanding of the impact of a corporate strategy based on social performance regarding the attractiveness of the organization. A very important issue is determining the degree of perception of SROs in the environment in which organizations operate. There is a great deal of information about how the various organizations produce environmental and social events, but it is often difficult for a variety of reasons: large amount of diffuse information, lack of comparability, forced images to create a positive image about the organization, false advertising.

The aim of this paper is to present: several new inequalities for power series with real coefficients by using a Young-type inequality for sequences of complex numbers, a matrix analogue for the Hilbert-Schmidt norm and a trace inequality for positive operators in Hilbert spaces, starting from a refinement of the classical Kittaneh-Manasrah inequality. Then several consequences as applications will be presented for special functions such as polylogarithm and for elementary functions.

In this research the impact of concentration dilution for a mixture of two dyes (Erythrosine, Eosin y) on the efficiency of solar cell was investigated. This was conducted via the fabrication of transparent panels that are placed on solar cell surface. The latter panels were made of the above dyes mixture with epoxy resin with different concentration (variable dilution ratios). The results demonstrate that increasing concentration dilution would lead to increase the solar cell efficiency, Also, the open circuit voltage (V_oc), short circuit current (I_sc), Fill Factor (FF), fluorescence lifetime (t_f) radiation lifetime (t_fm), maximum voltage (v_max), maximum current (I_max) and solar cell efficiency was calculated.

Along the time, the pesticides, on the one hand, represented a solution for covering human needs and combating pests, thus helping peoples lives, and on the other by their continuous use, led to the contamination of food and natural resources with substances dangerous for humans, many of which being carcinogenic. The inadequate use of pesticides may contaminate the soil, water reservoirs, superficial and groundwater, biota and consequently ending up contaminating people. This study highlighted that quartz crystal microbalance (QCM) technique corelated with attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) would be able to detect different pesticides in aqueous solution in order to establish their ilegal used in agriculture under various name.

This article shows the rheological behavior of soybean oil. Soybean oil were investigated using a Haake VT 550 Viscotester developing shear rates ranging between 3 and 120 s^-1 and measuring viscosities from 10^4 to 10^6 mPa·s when the HV_1 viscosity sensor is used. The temperature ranging was from 313K to 373K and the measurements were made from 10 to 10 degrees. The accuracy of the temperature was ± 0.1 ºC. Measurements were done in different shear rates, during heating. For the study of rheological behavior we found three formulas that show shear shear dependence on shear stress. Equation constants a, b c and τ_o were determined by fitting linear and exponential.

Presence of different chemical species at the liquid / liquid interface can facilitate or not the transfer of a compound from one phase to another. The process of transferring alkaline cations from the aqueous phase to the organic phase using calixarenes or crown ethers as macrocyclic carriers is influenced by the transfer of chemical species through interface. In this context, the interfacial tension value is important for assessing the cation transfer process through the interface. Present study investigates the interfacial tension variation at the chloroform / water interface when p-tert-butyl-calix[n]arenes (n = 4, 6, 8), benzo-15-crown-5, benzo-18- crown-6, 4′-NH2 -benzo-15-crown-5, and 4′-NH2 -benzo18-crown-6 were added to the organic layer. The addition of sodium or potassium hydroxide to the aqueous phase has led to significant reduction of interfacial tension for the studied chloroform / water systems. Neutralization of basic solution was achieved by adding of hydrochloric acid solution to aqueous solution conducting to the increase of the interfacial tension value. Modification of the macrocyclic ligand present in the organic layer led to the modification of the shape of curve interfacial tension vs. pH indicating a possible contribution of macrocyclic ligand selectivity for a particular alkaline cation complexation.

A multidisciplinary study on the archaeological site located in Hunedoara – the Court area, developed in 2011 – 2012 have been analyzed in this paper. The ceramic samples were analyzed through spectral techniques: FTIR, Raman, microscopy techniques (SEM-EDS), colorimetric and porosimetry measurements, for determining the chemical, mineralogical and petrographic characteristics on the investigated ceramic samples discovered during the archaeological campaign from 2012; the results are presented in order to determine the raw material provenance and the production process. Some information on constructive history and degradation or damage status, are detailed.

Sea buckthorn (Hippophaë rhamnoides Lis) is a good source of nutrients and bioactive substances, such as vitamins, carotenoids, organic acids, pectic substances and other elemental components. Preservation by freezing is a modern and easy method to increase the shelf life of the fruit. The effects of freezing and storage on nutritional value and bioactive compounds have not been fully elucidated and the results are often contradictory. The purpose of this paper is to evaluate the effect of freezing and storage on the retention of vitamin C, β-carotene and pectic substances. The sea buckthorn fruits were frozen at -18, -200 C and stored for 7, 14, 21, 28, 35, 42, and 56 days. After 56 days of storage, a vitamin C retention of 73.13%, a β-carotene retention of 86.52% and a pectic substances (expressed as calcium pectate) retention of 79.58% of was obtained.

This research has as main objective the identification of the potential risks that the mining activity in the upper basin of the Arieş River has on the economic development of this area. The method chosen for this research was the Survey-Based Inquiry in order to know the views of the inhabitants of this area on how economic development and economic welfare was or is affected by mining activity and mine closure.

Nonlinear mathematical problems and their solutions attain much attention. In soliton theory an efficient tool to attain various types of soliton solutions is the Expfunction technique. Under study article is devoted to find soliton wave solutions of extended model equation for Shallow water waves via a reliable mathematical technique. By use of proposed technique we attain soliton wave solution of various types. The regulation of proposed algorithm is demonstrated by consequent numerical results and computational work. It is observed that under discussion technique is user friendly with minimum computational work; also we can extend for physical problems of different nature.

Analysis of Unsteady Magneto hydro dynamic slip flow of Casson fluid past a vertically stretching sheet in presence of Suction and blowing with heat absorption and generation is carried out numerically. The resulting Partial differential equation is converted in to Ordinary differential equation using similarity conditions and these equations with boundary conditions are solved using fourth order Runge-Kutta method by applying MATLAB software. The resulting numerical values are plotted to study velocity and temperature profiles in order to make out changes in the boundary layer thickness by using different parameters. The digression in the velocity and temperature profiles are studied by varying the values of different governing parameters like Slip parameter (μ), Magnetic parameter (M), Unsteadiness parameter (A), Permeability parameter (λ), Casson parameter (β), Prandtle number (Pr), Radiation parameter (Nr), Heat generation and Absorption parameter (δ), and Suction / Blowing parameter (S) .It is observed that variation in slip parameter (μ) has a profound effect on velocity boundary layer thickness and on also on heat transfer rate in presence of suction / blowing.

A junction made of two materials of the same type is named homojunction. If the two regions of junction are made of different types of semiconductors, then we talk about a heterojunction. The paper submits to your attention some ways of improving the values of a very important parameter of the bipolar junction transistors (BJT), namely the current static amplification factor (β). A new phase in the evolution of the semiconductor devices is the manufacturing and using of the heterojunctions on a large scale

Starting from ancient age, physical phenomena have become more and more intriguing for humanity, and always evolutionary steps have been in strong connection with the idea of understanding their importance for a better life. Not once, the open minds were considered outrageous for their theories or the concepts and hypothesis regarding the reasons for which things are happening as it happens. One of the primary informations regarding to a force / phenomena which was capable to attract things date from 4000 years ago, when a Greek shepherd discovered a strange rock that somehow keept his shoes attracted to the ground. The name of the shepherd was Magnes and the lodestone from then is known as magnetite. In nowadays the magnets are being used in all sort of devices or machinery, in industry and even in medicine. On this considerent, the magnetic field that sustains the attraction force need to be in accordance with needs so; in Electronics this can be reach through coils and evenmore the magnitude of it can be adjusted to fits the requirements. This study proposes a simple design of a coil which can be used inside of electromagnetic actuation systems for controlling the motion of microrobots. In this matter, it is required to define for this electronic component the right characteristics (dimensions, number of turns etc.), and simulate its actual capabilities as an indivudal constitutive element of a system. The actuation force is very important for a precise displacement of a microrobot under the influence of electromagnetic fields. Thus, it been taked into considerations the importance of knowing the acting of it before manufacturing process, reason for what a simulation was required to be done for the right adjustments to occure. In the last decades, the systems based on electromagnetic actuation used different types of coils grouped in all sort of forms for a better performance.