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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 1, No 3 (2017): October" : 7 Documents clear

Investigation into Low SAR PIFA Antenna and Design a Very Low SAR U-slot Antenna using Frequency Selective Surface for cell-phones and Wearable Applications Kourosh Javadi; Nader Komjani
Emerging Science Journal Vol 1, No 3 (2017): October
Publisher : Ital Publication

There are very important questions. “Do Electromagnetic waves have irreparable effects on human or not?” “Are there any relation between cancer and waves?” and finally “what should we do to be safe?”. In the present article, these questions will be answered simply and professionally. First of all, Specific Absorption rate (SAR) is define then L-Slot and U-slot antenna is designed and simulated using cell-phones and wearable applications, operating at and consist of GSM900 and GSM1800. Standard frequency band width for the first and second band is and for uplink and downlink and in the present research these numbers are obtained. The SAR of each antenna is measured and is compared with each other. Thanks to design of antenna, The SAR of U-Slot antenna is very low and it is almost stimulated and this sentence means this antenna is anti-cancer. Finally, Some SRR unit-cells are designed and when they are used in structure, SAR will be more decrease. Last SAR value is and for each bands .In the last table, There are some comparison between different creditable references and present article SAR reduction is acceptable and it is near to percentage.

Designing a Novel Reversible Systolic Array Using QCA Mohammad Mahdi Abdollahi; Mohammad Tehrani
Emerging Science Journal Vol 1, No 3 (2017): October
Publisher : Ital Publication

Many efforts have been done about designing nano-based devices till today. One of these devices is Quantum Cellular Automata (QCA). Because of astonishing growth in VLSI circuits Designs in larger scales and necessity of feature size reduction, there is more need to design complicated control systems using nano-based devices. Besides, since there is a critical manner of temperature in QCA devices, complicated systems using these devices should be designed reversibly. This article has been proposed a novel architecture for QCA circuits in order to utilizing in complicated control systems based on systolic arrays with high throughput and least power dissipation.

Development of a Biomedical Neckbrace through Tailored Auxetic Shapes Martina Panico; Carla Langella; Carlo Santulli
Emerging Science Journal Vol 1, No 3 (2017): October
Publisher : Ital Publication

Objectives This work concerned the study of auxetic materials are cellular structures with negative Poisson’s ratio, therefore bending, instead of stretching, when pulled, therefore offering support.Methods/AnalysisNature is able to develop irregular cellular structures, making them denser only when needed and sparser in other areas and this experience has been applied to the development of structure with auxetic geometries other than the classical bow-shaped one.FindingsThe study of these inherent characteristics of nature allowed the development of three innovative auxetic patterns, not existing in literature, modifying their structure to optimize their function, starting from the study of elementary geometrical shapes to arrive to auxetic unitary cells formed by concave polygons, united to other geometrical elements so to obtain auxetic structures both of multicellular type and of node-link type.Novelty/ImprovementThe knowledge acquired about novel auxetic structures has been applied to the development of an innovative neckbrace for orthopaedic purposes, which is comfortable, in that it is flexible, resistant, anatomical and transpiring.

Optimizing Raytracing Algorithm Using CUDA Sayed Ahmadreza Razian; Hossein MahvashMohammadi
Emerging Science Journal Vol 1, No 3 (2017): October
Publisher : Ital Publication

Now, there are many codes to generate images using raytracing algorithm, which can run on CPU or GPU in single or multi-thread methods. In this paper, an optimized algorithm has been designed to generate image using raytracing algorithm to run on CPU or GPU in multi-thread algorithm.This algorithm employs light with depth of 8 to generate images. It is optimized by changing pixel travel priority and ray of light to thread, dedicating depth function to empty threads, and using optimized functions from MSDN library. Its code has been written in C++ and CUDA. In addition, we do the following to show its performance: comparing implementation in different compiler mode, changing thread number, examining different resolution, and investigating data bandwidth.The results show that one can generate at least 11 frames per second in HD (720p) resolution by GPU processor and GT 840M graphic card, using trace method. If better graphic card employ, this algorithm and program can be used to generate real-time animation.

The Influence of Organizing Historical Textures on Citizenry Satisfaction in the Old Texture Neighbourhoods of Rasht Reza Askarizad; Hossein Safari; Mohammadreza Pourimanparast
Emerging Science Journal Vol 1, No 3 (2017): October
Publisher : Ital Publication

Study about historical textures and its values is always one of the most important topics in recent decades of Iran. This research is based on organizing historical textures and its influence on citizenry satisfaction in the old texture neighbourhoods of Rasht. This case, start with recognition the neighbourhood and investigate of its problems and requirements of citizens who live there via codify questionnaire. In this research, it was attempted to organize historical textures, with cite descriptive - analytical method and base on field and library surveys. Also utilize SWOT model, in order to improve vitality situations with idealistic solutions in this historical texture. Results show that, this neighbourhood has physical & spatial weaknesses and it is not proportional with its resident’s requirements. In conclusion, according to investigates with organize historical textures in terms of physical, social, economic and environmental aspects, we're able to return dynamism, vivacity and vitality to the historical textures in addition to their requirements. Also preservation from historical textures, if done with tact and planning, it can create symbols of identity and culture for future generations.

An Offset-free High linear Low Power High Speed Four-Quadrant MTL Multiplier Jafari, HoseinAli; Abbasi, Zahra; Azhari, Seyed Javad
Emerging Science Journal Vol 1, No 3 (2017): October
Publisher : Ital Publication

In this paper a new CMOS current-mode four-quadrant analog multiplier circuit is proposed. The major advantages of this design are high linearity, high speed and low power consumption. Removing dc offset is the most important improvement in this topology. The circuit is designed with 1.8V supply voltage and is simulated using HSPICE simulator by level 49 parameters in 0.18Âµm standard CMOS TSMC technology. The aspect ratios of the MOSFETs are optimized using Evolutionary algorithm by MATLAB. The simulation results of this analog multiplier demonstrate a maximum linearity error of 2.6%, a THD of 1.77%, maximum power consumption of 157 ÂµW, -3dB bandwidth of 241MHz and almost free from dc offset.

Three-Phase Multistage System (DC-AC-DC-AC) for Connecting Solar Cells to the Grid Mahmudreza Changizian; Ali Zakerian; Araz Saleki
Emerging Science Journal Vol 1, No 3 (2017): October
Publisher : Ital Publication

Inverter systems that feed electrical power from photovoltaic (PV) system into the grid must convert the direct current of the PV array into the alternating current of the grid. In many applications, it is important for a converter to be lightweight, highly reliable, input/output isolated, flexible and operable in a boost mode. These features can be achieved by using a High-Frequency inverter which involves an isolated DC-DC stage and DC-AC section, which provides AC output. This paper proposes a new three phase topology, based on multi stage converter and PV system in order to use in medium and high power applications. The Perturb and Observe (P&O) method is used for maximum power point tracking (MPPT) control of PV array. The switching control signals for three-phase inverter are provided by hysteresis control method. Also, the comparison between the proposed topology and traditional structures has been conducted and finally the simulation researches are performed in a closed-loop control system by MATLAB/Simulink software to verify the operation of the proposed structure. The results represent better performance of the introduced system over traditional topologies.

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