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Emerging Science Journal

ESJ
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Published by Ital Publication

ISSN : 26109182 EISSN : - DOI : -

Core Subject : Social,

Environmental Science

Emerging Science Journal is not limited to a specific aspect of science and engineering but is instead devoted to a wide range of subfields in the engineering and sciences. While it encourages a broad spectrum of contribution in the engineering and sciences. Articles of interdisciplinary nature are particularly welcome.

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Articles 7 Documents

Search results for , issue "Vol 3, No 6 (2019): December" : 7 Documents clear

Modeling and Simulation of the Photovoltaic Cells for Different Values of Physical and Environmental Parameters Azem Hysa
Emerging Science Journal Vol 3, No 6 (2019): December
Publisher : Ital Publication

Both research and technological development in the area of renewable energy sources are necessary to account for the increase in energy demand and environment problems in the world. The photovoltaic (PV) cell has been described by non-linear outputs characteristics in current-voltage and power-voltage. This outputs is affected by various effects such as; series resistance ( ), shunt resistance ( ), solar irradiance and temperature. In this paper the effect of variation of parameters has been studied such as series resistance ( ) and shunt resistance ( ) of the diode in the photovoltaic cell and these effects could be seen in the Current-Voltage (I-V) and Power-Voltage (P-V) characteristic curves. In this paper also has been studied the effect of variation of the environmental parameters such as solar irradiance and temperature. Results show that a higher temperature at constant solar irradiance produces a decrease power. So the voltage and the photovoltaic cell output power tend to decrease at higher temperatures, but there is no noticeable effect on the photovoltaic cell current. Thus, it is important to keep the cell temperature as low as possible, because higher temperatures have negative effect on output power of photovoltaic cell. On the other hand, the effect of solar irradiance on photovoltaic cell, it reveals that higher solar irradiance gives higher current and higher power. Shunt resistance has significant effect on the operating characteristic curves of PV cells as low power output is recorded if the value of shunt resistance varies from 0.07 ohms to 1700 ohms. Finally, I have presented power-voltage characteristic curves and current voltage characteristic curves of photovoltaic cell for different solar irradiance in Shkoder, Tirana and Vlore.

Synthesis of Aqueous Suspensions of Zero-Valent Iron Nanoparticles (nZVI) from Plant Extracts: Experimental Study and Numerical Modeling Michalis Karavasilis; Christos D. Tsakiroglou
Emerging Science Journal Vol 3, No 6 (2019): December
Publisher : Ital Publication

Plant extracts were produced from Camellia sinesis (Green Tea) and Punica granatum (pomegranate), and the total concentration of polyphenols was measured in terms of equivalent concentration of Gallic acid by using the Folin-Ciocalteu method. Zero Valent Iron nanoparticles (nZVIs) were synthesized in a semi-batch reactor by mixing a pre-specified volume of plant extract or Gallic Acid solution with an aqueous solution of iron sulfate heptahydrate (FeSO4·7H2O). To monitor the kinetics of nZVI synthesis, the transient responses of solution pH and redox potential (Eh) were recorded with two probes adequately connected with a data acquisition card. The nanoparticles were characterized by a variety of techniques: Dynamic Light Scattering (DLS), ζ-potential, Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy, Transmission Electron Microscopy (TEM). A kinetic parametric model, based on two parallel single electron transfer (SET) and hydrogen atom transfer (HAT) reactions, was suggested to quantify the dynamics of ferrous ions reduction to zero valence, and its parameters were estimated for each experimental system by matching the transient response of pH. The temporal changes of redox potential during nZVI synthesis were indicative of the reaction progress and agreed with the numerical predictions in semi-quantitative basis. The numerical model enabled us to track the temporal variation of the concentration of iron and polyphenol species, and calculate the yield of ZVI synthesis. The reactivity of nZVIs was assessed by measuring their capacity to reduce hexavalent chromium Cr (VI) in aqueous solutions prepared from potassium dichromate (K2Cr2O7).

Stink Bug Communication with Multimodal Signals Transmitted through Air and Substrate Andrej Čokl; Alenka Žunič-Kosi; Raul Alberto Laumann
Emerging Science Journal Vol 3, No 6 (2019): December
Publisher : Ital Publication

This review represents complex mechanisms and processes of multimodal communication in stink bugs. During reproductive behavior the airborne and substrate-borne signals enable mate recognition, mediate directionality of movement, eliminate rivals and motivate partners for copulation. Species specific characteristics prevent hybridization at various levels of mating behavior. Male sex and/or aggregation pheromones as uni- or multicomponent signals attract mates to land on the same plant and there, trigger females to call males by vibratory signals, transmitted through the plant. Communication during courtship runs at short distance with visual, airborne, substrate-borne and contact chemical and mechanical signals. Abdomen vibrations produce the main repertoire of female and male calling, courtship and rival vibratory signals. To increase their informational value, stink bugs tune signal frequency, amplitude and temporal characteristics with mechanical properties of plants. The airborne component of species non-specific and high amplitude signals, produced by body tremulation and wing buzzing enables communication contact between mates standing on mechanically isolated plants. Female vibratory signals increase the amount of male emitted pheromone and the latter keeps female calling. Interaction, synergy and characteristics of visual, contact chemical and vibratory signals, exchanged during courtship remain under-investigated. Female and male competition for access to copulation in imbalanced sex conditions is characterized by duetting with rival song vibratory signals. Different receptors in and on different parts of the body are able to detect with high sensitivity multimodal airborne and substrate-borne communication signals. The relevance of the multimodal communication for the reproductive success of stink bugs is discussed.

Finite-time Stability, Dissipativity and Passivity Analysis of Discrete-time Neural Networks Time-varying Delays Porpattama Hammachukiattikul
Emerging Science Journal Vol 3, No 6 (2019): December
Publisher : Ital Publication

The neural network time-varying delay was described as the dynamic properties of a neural cell, including neural functional and neural delay differential equations. The differential expression explains the derivative term of current and past state. The objective of this paper obtained the neural network time-varying delay. A delay-dependent condition is provided to ensure the considered discrete-time neural networks with time-varying delays to be finite-time stability, dissipativity, and passivity. This paper using a new Lyapunov-Krasovskii functional as well as the free-weighting matrix approach and a linear matrix inequality analysis (LMI) technique constructing to a novel sufficient criterion on finite-time stability, dissipativity, and passivity of the discrete-time neural networks with time-varying delays for improving. We propose sufficient conditions for discrete-time neural networks with time-varying delays. An effective LMI approach derives by base the appropriate type of Lyapunov functional. Finally, we present the effectiveness of novel criteria of finite-time stability, dissipativity, and passivity condition of discrete-time neural networks with time-varying delays in the form of linear matrix inequality (LMI).

The Effects of Bio-inspired Electromagnetic Fields on Healthy Enhancement with Case Studies Shujun Zhang; Mike Clark; Xuelei Liu; Donghui Chen; Paula Thomas; Luquan Ren
Emerging Science Journal Vol 3, No 6 (2019): December
Publisher : Ital Publication

In this paper, an innovative bionic system will be presented. This system can be used to generate bio-inspired electromagnetic fields (BIEFM) by mimicking natural Earth magnetic fields, the frequencies, strengths and waveforms of body organs and cellular pulsations. The preliminary tests have been carried out to investigate the influences of BIEFM on the ATP levels of people to prove the interactions between BIEMF and the cellular level's bio-processing activities. This system has been applied for the health enhancement of humans and pets etc. A number of case studies will be present to demonstrate the efficiency and effectiveness of the system. The case study experimental results have shown that this innovative bio-inspired system works efficiently and effectively in enhancing human and animal health. It has been proven that this bio-inspired system can be effectively applied to many areas such as (1) human health enhancement and illness treatment, (2) pet health enhancement, and (3) reduction or elimination of 'jet lag'.

Stock Price Reactions on NASDAQ Stock Exchange for Special Dividend Announcements Seyedimany, Arian
Emerging Science Journal Vol 3, No 6 (2019): December
Publisher : Ital Publication

Announcing dividend pay-out policy by a company will signals market firmâ€™s future prospects and changes its stock prices according to dividend signalling theory. By analysis the effect of special dividend announcements for 5 companies listed in NASDAQ for the period of 2014-2018, this study investigates the stock price reactions to special dividend announcement for 40 days around the event and challenges dividend signalling theory. The empirical results calculated both in discrete and logarithmic forms. Only few disordered significant abnormal returns and average abnormal returns occurred according to the t-test. The results show that shareholders do not gain value from announcement of special dividend in NASDAQ stock exchange market. That Results indicated from adjusted market model in this research do not support dividend-signalling theory Hence do not confirm that the announcement of dividend has significant effect on price of shares. In general the results consistent with the Miller and Modigliani (1961) dividend irrelevance hypothesis.

Rethinking Strategy for SMEE Support in the Light of the Entrepreneurial Ecosystem Miroljub Hadzic; Petar Pavlovic
Emerging Science Journal Vol 3, No 6 (2019): December
Publisher : Ital Publication

Serbia has started transition in 2000. Although it experienced fast growth prior to the global economic crisis, critical number of SMEs was not created to achieve a sustainable development of entrepreneurial sector. During the crisis period SMEs faced with development limits, especially shops and micro companies. In the period 2009-2014 Serbian economy had zero rate of growth, the business climate was generally somewhat deteriorated and support to SMEE weakened by Government, local level of governance and financial institutions. There are positive signs of economic recovery of Serbia during 2015 and 2016. The market reforms got momentum in some important areas. The Government successfully put under control huge budget deficit and public debt. The inflation rate became for the first time low, similar to the European level. The Strategy for support SME, entrepreneurship and competitiveness in the period 2015-2020 was enacted at the end of 2014. Its importance became critical considering weaknesses of entrepreneurial sector, bottlenecks and limits of existing governmental measures for SMEE support. The point is to highlight those from the point of view of development the entrepreneurial ecosystem, as a new conceptual framework designed to foster economic development via entrepreneurship, innovation and small business growth.

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