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Article
Publication date: 8 November 2019

Mohsen Karimi, Mohammad Pichan, Mehdi Sadri and Seyed Morteza Seyedjafari

This paper aims to investigate an improved control method and digital signal processor-based (DSP-based) digital implementation of three-phase standalone inverter. The…

Abstract

Purpose

This paper aims to investigate an improved control method and digital signal processor-based (DSP-based) digital implementation of three-phase standalone inverter. The proposed method is performance developed of the proportional-resonant controller (PRC) with harmonic injection technique, aiming to improve load voltages quality under different loads, especially nonlinear loads. The advanced proposed multi-loop controller is consisted of current harmonic loops for suppressing odd harmonic, which are analyzed in discrete-time domain. Besides, the voltage loop is also used to compensate the output capacitor voltage.

Design/methodology/approach

The proposed method can effectively enlarge output voltage stability with low total harmonics distortion and improve the dynamic transient response. The other advantage of the proposed PRC is the injection of the selective harmonic without any additional calculation compensator.

Findings

The method is given the opportunity to be controlled exactly all harmful outputs with high-quality voltage referenced of the standalone inverter. The proposed method is implemented using a DSP processor (TMS320F28335) and is verified on the 10 kVA three-phase standalone inverter prototype.

Originality/value

The proposed method is performance developed of the PRC with harmonic injection technique, aiming to improve load voltages quality under different loads, especially nonlinear loads.

Details

World Journal of Engineering, vol. 16 no. 6
Type: Research Article
ISSN: 1708-5284

Keywords

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Book part
Publication date: 6 July 2021

Sansom Milton

Iraqi universities in the aftermath of invasion in 2003 experienced extremely high levels of “post”-war violence and insecurity. The most widely known dimension of this…

Abstract

Iraqi universities in the aftermath of invasion in 2003 experienced extremely high levels of “post”-war violence and insecurity. The most widely known dimension of this violence is the shocking assassination campaign that killed hundreds of Iraqi academics. This paper provides an analysis of violence and insecurity in post-2003 that takes a broader optic and considers multiple forms of vulnerability to attack including insurgencies, sectarian conflict, and criminal violence. It also considers the various responses to the security dilemma taken by Coalition forces – principally counter-terrorism and stabilization efforts – and by Iraqi policy-makers and higher education communities, including security measures, politicization, ethno-sectarianization, and displacement.

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Article
Publication date: 28 August 2007

Mehdi Ghazisaeedi, Leyland F. Pitt and S. Kamal Chaharsooghi

The potential impact of the internet on marketing is a common topic of discussion in marketing literature. However, there is still much debate on exactly what impact it…

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Abstract

Purpose

The potential impact of the internet on marketing is a common topic of discussion in marketing literature. However, there is still much debate on exactly what impact it will have on developing countries. To perceive this impact world‐wide, it is essential to spread some light to the less investigated parts of the globe as well. This study aims to reach a better conceptual model for the internet's impact on marketing in Iran, by examining Iranian marketing managers' perceptions of the internet's impact on their key marketing activities and comparing the results with other parts of the world.

Design/methodology/approach

The paper employs a cross‐sectional research design involving self‐administered delivery and collection surveys to Iranian marketing decision makers.

Findings

The findings suggest that the impact of these new media will be to cause firms to redefine markets, marketing activity and value creation, although these changes are not dramatic.

Research limitations/implications

The findings reported here are snapshots in time. The internet's rapid evolution and growth demand that regular tracking with longitudinal designs be implemented.

Practical implications

Firms need to make changes in the marketing activities and market definitions and to try to reach the new ways that are created through the internet.

Originality/value

A modified model for the world wide web marketing that seems to be more realistic for developing countries is presented.

Details

Direct Marketing: An International Journal, vol. 1 no. 3
Type: Research Article
ISSN: 1750-5933

Keywords

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Article
Publication date: 17 October 2018

T. Hayat, Arsalan Aziz, Taseer Muhammad and A. Alsaedi

The purpose of this study is to examine the Darcy–Forchheimer flow of viscous nanoliquid because of a rotating disk. Thermophoretic diffusion and random motion aspects are…

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61

Abstract

Purpose

The purpose of this study is to examine the Darcy–Forchheimer flow of viscous nanoliquid because of a rotating disk. Thermophoretic diffusion and random motion aspects are retained. Heat and mass transfer features are analyzed through convective conditions.

Design/methodology/approach

The governing systems are solved numerically by the shooting technique.

Findings

Higher porosity parameter and Forchheimer number Fr depict similar trend for both velocity profiles f' and g. Both temperature and concentration profiles show increasing behavior for higher Forchheimer number Fr. An increase in Prandtl number Pr corresponds to lower temperature profile, while opposite trend is noticed for thermal Biot number. Larger concentration Biot number exhibits increasing behavior for both concentration and its associated layer thickness.

Originality/value

To the best of the author’s knowledge, no such consideration has been given in the literature yet.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 28 no. 11
Type: Research Article
ISSN: 0961-5539

Keywords

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