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…
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.
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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…
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.
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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…
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.
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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…
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.
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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…
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.