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Article
Publication date: 6 March 2017

Davood Ramesh, Hasan Karimi M. and Massoud Shahheidari

The purpose of this paper is to introduce new and modified “staged combustion” cycles in the form of engineering algorithm as a possible propulsion contender for future aerospace…

717

Abstract

Purpose

The purpose of this paper is to introduce new and modified “staged combustion” cycles in the form of engineering algorithm as a possible propulsion contender for future aerospace vehicle to achieve the highest possible “total impulse” to “mass” of propulsion system.

Design/methodology/approach

In this regard, the mathematical cycle model is formed to calculate the engine’s parameters. In addition, flow conditions (pressure, temperature, flow rate, etc). in the chamber, nozzle and turbopump are assessed based on the results of turbo machinery power balance and initial data such as thrust, propellant mixture ratio and specifications. The developed code has been written in the modern, object-oriented C++ programming language.

Findings

The results of the developed code are compared with the Russian RD180 engine which demonstrates the superiority and capability of new “thermodynamic diagrams”.

Research limitations/implications

This algorithm is under constraint to control the critical variation of combustion pressure, turbine rpm, pump cavitation and turbine temperature. It is imperative to emphasize that this paper is limited to “oxidizer-rich staged combustion” engines with “single pre-burner”.

Originality/value

This study sheds light on using fuel booster turbopump and the second-stage fuel pump to moderate the effect of cavitation on pumps which reduces tank pressure and, as a consequence, decreases the propulsion system weight.

Details

Aircraft Engineering and Aerospace Technology, vol. 89 no. 2
Type: Research Article
ISSN: 1748-8842

Keywords

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Article
Publication date: 6 June 2023

Davood Ghorbanzadeh

This study aims to explain the factors associated with receiving a specific brand of COVID-19 vaccine within the framework of the theory of reasoned action (TRA). This study…

135

Abstract

Purpose

This study aims to explain the factors associated with receiving a specific brand of COVID-19 vaccine within the framework of the theory of reasoned action (TRA). This study extends the TRA with the country-of-origin image (COI), brand image and electronic word of mouth variables.

Design/methodology/approach

This study is based on a cross-sectional survey conducted among 460 people who received the Sinofarm vaccine. Participants were selected using an online convenience sampling method. The structural equation modeling technique tests the proposed hypotheses.

Findings

The results showed that the essential factor associated with the intent to get the Chinese Sinopharm vaccine is the attitude toward the Signopharm vaccine. Also, word of mouth, subjective norms and brand image are the most critical factors that play a role in forming a favorable attitude toward the Sinopharm vaccine. Finally, the country-of-origin image does not affect attitudes toward the Sinopharm vaccine.

Originality/value

The area of vaccine marketing has been given limited attention in academic literature. This study addresses this area with little research and is greatly attractive to many brands targeting the consumer market. The study results can form a foundation for creating the branding strategy for this product category and assessing its demand in various markets.

Details

International Journal of Pharmaceutical and Healthcare Marketing, vol. 17 no. 3
Type: Research Article
ISSN: 1750-6123

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Article
Publication date: 20 January 2023

Davood Ghorbanzadeh and Muhammad Salman Shabbir

This study aims to explain the factors associated with receiving a specific brand of Covid-19 vaccine within the framework of the theory of reasoned action. The study extends the…

797

Abstract

Purpose

This study aims to explain the factors associated with receiving a specific brand of Covid-19 vaccine within the framework of the theory of reasoned action. The study extends the theory of reasoned action with the country of origin image, brand image and electronic word of mouth (e-WOM) variables.

Design/methodology/approach

The study is based on a cross-sectional survey conducted among 460 people who received the Sinofarm vaccine. Participants were selected using an online convenience sampling method. The structural equation modeling (SEM) technique tests the proposed hypotheses.

Findings

The results showed that the essential factor associated with the intent to get the Chinese Sinopharm vaccine is the attitude toward the Signopharm vaccine. Also, WOM, subjective norms and brand image are the most critical factors that play a role in forming a favorable attitude toward the Sinopharm vaccine. Finally, the country-of-origin image does not affect attitudes toward the Sinopharm vaccine.

Originality/value

The area of vaccine marketing has been given limited attention in academic literature. This study addresses this area with little research and is greatly attractive to many brands targeting the consumer market. The study results can form a foundation for creating the branding strategy of this product category and assessing its demand in various markets.

Details

Journal of Social Marketing, vol. 13 no. 2
Type: Research Article
ISSN: 2042-6763

Keywords

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Article
Publication date: 11 September 2019

Mahantesh M. Nandeppanavar, T. Srinivasulu and Shanker Bandari

The purpose of this paper is to study the flow, heat and mass transfer of MHD Casson nanofluid due to an inclined stretching sheet using similarity transformation, the governing…

82

Abstract

Purpose

The purpose of this paper is to study the flow, heat and mass transfer of MHD Casson nanofluid due to an inclined stretching sheet using similarity transformation, the governing PDE’S equations of flow, heat and mass transfer are converted into ODE’S. The resulting non-linear ODE’S are solved numerically using an implicit finite difference method, which is known as Kellor-box method. The effects of various governing parameters on velocity, temperature and concentration are plotted for both Newtonian and non-Newtonian cases. The numerical values of skin friction, Nusselt number and Sherwood number are calculated and tabulated in various tables for different values of physical parameters. It is noticed that the effect of angle of inclination enhances the temperature and concentration profile whereas velocity decreases. The temperature decreases due to the increase in the parametric values of Pr and Gr due to thickening in the boundary layer.

Design/methodology/approach

Numerical method is applied to find the results.

Findings

Flow and heat transfer analysis w.r.t various flow and temperature are analyzed for different values of the physical parameters.

Research limitations/implications

The numerical values of skin friction, Nusselt number and Sherwood number are calculated and tabulated in various tables for different values of physical parameters.

Practical implications

The study of the boundary layer flow, heat and mass transfer is important due to its applications in industries and many manufacturing processes such as aerodynamic extrusion of plastic sheets and cooling of metallic sheets in a cooling bath.

Originality/value

Here in this paper the authors have investigated the MHD boundary layer flow of a Casson nanofluid over an inclined stretching sheet along with the Newtonian nanofluid as a limited.

Details

Multidiscipline Modeling in Materials and Structures, vol. 16 no. 1
Type: Research Article
ISSN: 1573-6105

Keywords

Available. Open Access. Open Access

Abstract

Details

Journal of Intelligent Manufacturing and Special Equipment, vol. 4 no. 1
Type: Research Article
ISSN: 2633-6596

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Article
Publication date: 27 November 2020

Saurabh Agrawal and Rajesh Kumar Singh

Outsourcing has become a strategic decision for most of the organizations in the present context of globalization and circular economy. The objective of proposed study is to…

1268

Abstract

Purpose

Outsourcing has become a strategic decision for most of the organizations in the present context of globalization and circular economy. The objective of proposed study is to empirically investigate the relationship between the outsourcing benefits and triple bottom line (TBL)-based performance of reverse supply chain (RSC) comprising of economic, environmental and social factors.

Design/methodology/approach

In the present study, the partial least square path approach of structural equation modeling has been applied for testing hypotheses. A questionnaire was developed for collecting the information and responses from the experts of electronics industry, India. Measurement models were tested for ensuring the fitness of data for further applying partial least square path approach of SEM.

Findings

The results provide insightful information on outsourcing and RSC performance. It reveals that outsourcing decisions are important and have great influence on the economic, environmental and social performance of RSC.

Research limitations/implications

The study will provide useful guidance to the organizations for outsourcing decisions. One of the limitations of the study is that it has considered data collected from the Indian electronics industry. Therefore, results may not be generalized.

Originality/value

The third-party service providers have core competencies, and they are the experts of providing RSC services. It is also apparent from the exploration of past research and theoretical background that there are limited number of studies focusing on the impact of outsourcing decisions in RSC performance specifically from the TBL perspective. Hence, the proposed study is an effort to explore the impact of outsourcing RSC activities on the performance of RSC from a sustainability perspective.

Details

Benchmarking: An International Journal, vol. 28 no. 4
Type: Research Article
ISSN: 1463-5771

Keywords

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