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1 – 10 of over 7000Liwei Ju, Zhe Yin, Qingqing Zhou, Li Liu, Yushu Pan and Zhongfu Tan
This study aims to form a new concept of power-to-gas-based virtual power plant (GVPP) and propose a low-carbon economic scheduling optimization model for GVPP considering carbon…
Abstract
Purpose
This study aims to form a new concept of power-to-gas-based virtual power plant (GVPP) and propose a low-carbon economic scheduling optimization model for GVPP considering carbon emission trading.
Design/methodology/approach
In view of the strong uncertainty of wind power and photovoltaic power generation in GVPP, the information gap decision theory (IGDT) is used to measure the uncertainty tolerance threshold under different expected target deviations of the decision-makers. To verify the feasibility and effectiveness of the proposed model, nine-node energy hub was selected as the simulation system.
Findings
GVPP can coordinate and optimize the output of electricity-to-gas and gas turbines according to the difference in gas and electricity prices in the electricity market and the natural gas market at different times. The IGDT method can be used to describe the impact of wind and solar uncertainty in GVPP. Carbon emission rights trading can increase the operating space of power to gas (P2G) and reduce the operating cost of GVPP.
Research limitations/implications
This study considers the electrical conversion and spatio-temporal calming characteristics of P2G, integrates it with VPP into GVPP and uses the IGDT method to describe the impact of wind and solar uncertainty and then proposes a GVPP near-zero carbon random scheduling optimization model based on IGDT.
Originality/value
This study designed a novel structure of the GVPP integrating P2G, gas storage device into the VPP and proposed a basic near-zero carbon scheduling optimization model for GVPP under the optimization goal of minimizing operating costs. At last, this study constructed a stochastic scheduling optimization model for GVPP.
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Giovanni Busetta, Maria Gabriella Campolo and Demetrio Panarello
This article deals with the impact of ethnic origin on individual employability, focussing on the first stage of the hiring process. Deeply, the authors’ goal is to fathom whether…
Abstract
Purpose
This article deals with the impact of ethnic origin on individual employability, focussing on the first stage of the hiring process. Deeply, the authors’ goal is to fathom whether there is a preference for native job candidates over immigrants, decomposing the discrimination against minority groups into its statistical and taste-based components by means of a new approach.
Design/methodology/approach
The authors built up a data set by means of an ad hoc field experiment, conducted by sending equivalent fictitious CVs in response to 1000 real online job openings in Italy. The authors developed the discrimination decomposition index using first- and second-generation immigrants.
Findings
The authors’ main result is that both first- and second-generation immigrants are discriminated compared to Italians. In between the two categories, second-generation candidates are discriminated especially if their ethnicities are morphologically different from those of natives (i.e. Chinese and Moroccans). This last finding is a clear symptom of discrimination connected to taste-based reasons. On the other hand, first-generation immigrants of all nationalities but Germans are preferred for hard-work jobs.
Originality/value
The authors develop the discrimination decomposition index to measure the proportion of the two kinds of discrimination (statistical and taste-based) over the total one and apply a probit model to test the statistical significance of the difference in treatment between the three groups of natives, first-generation and second-generation immigrants.
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Subhasree Dutta, Somnath Bhattacharyya and Ioan Pop
The purpose of this study is to analyze the nonhomogeneous model on the mixed convection of Al2O3–Fe3O4 Bingham plastic hybrid nanofluid in a ventilated enclosure subject to an…
Abstract
Purpose
The purpose of this study is to analyze the nonhomogeneous model on the mixed convection of Al2O3–Fe3O4 Bingham plastic hybrid nanofluid in a ventilated enclosure subject to an externally imposed uniform magnetic field. Entropy generation and the pressure drop are determined to analyze the performance of the heat transfer. The significance of Joule heating arising due to the applied magnetic field on the heat transfer of the yield stress fluid is described.
Design/methodology/approach
The ventilation in the enclosure of heated walls is created by an opening on one vertical wall through which cold fluid is injected and another opening on the opposite vertical wall through which fluid can flow out.
Findings
This study finds that the inclusion of Fe3O4 nanoparticles with the Al2O3-viscoplastic nanofluid augments the heat transfer. This rate of enhancement in heat transfer is higher than the rate by which the entropy generation is increased as well as the enhancement in the pressure drop. The yield stress has an adverse effect on the heat transfer; however, it favors thermal mixing. The magnetic field, which is acting opposite to the direction of the inlet jet, manifests heat transfer of the viscoplastic hybrid nanofluid. The horizontal jet of cold fluid produces the optimal heat transfer.
Originality/value
The objective of this study is to analyze the impact of the inclined cold jet of viscoplastic electrically conducting hybrid nanofluid on heat transfer from the enclosure in the presence of a uniform magnetic field. The combined effect of hybrid nanoparticles and a magnetic field to enhance heat transfer of a viscoplastic fluid in a ventilated enclosure has not been addressed before.
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Li Ji, Yiwei Zhang, Ruifeng Shi, Limin Jia and Xin Zhang
Green energy as a transportation supply trend is irreversible. In this paper, a highway energy supply system (HESS) evolution model is proposed to provide highway transportation…
Abstract
Purpose
Green energy as a transportation supply trend is irreversible. In this paper, a highway energy supply system (HESS) evolution model is proposed to provide highway transportation vehicles and service facilities with a clean electricity supply and form a new model of a source-grid-load-storage-charge synergistic highway-PV-WT integrated system (HPWIS). This paper aims to improve the flexibility index of highways and increase CO2 emission reduction of highways.
Design/methodology/approach
To maximize the integration potential, a new energy-generation, storage and information-integration station is established with a dynamic master–slave game model. The flexibility index is defined to evaluate the system ability to manage random fluctuations in power generation and load levels. Moreover, CO2 emission reduction is also quantified. Finally, the Lianhuo Expressway is taken as an example to calculate emission reduction and flexibility.
Findings
The results show that through the application of the scheduling strategy to the HPWIS, the flexibility index of the Lianhuo Expressway increased by 29.17%, promoting a corresponding decrease in CO2 emissions.
Originality/value
This paper proposed a new model to capture the evolution of the HESS, which provides highway transportation vehicles and service facilities with a clean electricity supply and achieves energy transfer aided by an energy storage system, thus forming a new model of a transportation energy system with source-grid-load-storage-charge synergy. An evaluation method is proposed to improve the air quality index through the coordination of new energy generation and environmental conditions, and dynamic configuration and dispatch are achieved with the master–slave game model.
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The production of the ‘good life’ or the ‘less bad-life’ (Berlant, 2007, 2011), especially among generations of the Marcos dictatorship and the Epifanio de los Santos Avenue…
Abstract
The production of the ‘good life’ or the ‘less bad-life’ (Berlant, 2007, 2011), especially among generations of the Marcos dictatorship and the Epifanio de los Santos Avenue revolutions (henceforth, EDSA revolutions) in the Philippines, is animated by the ‘mobility imperative’ (Farrugia, 2016). The mobility imperative includes processes that encourage or demand mobility (Farrugia, 2016) for individuals and institutions. It figures in various ‘systems of practice’ (Levitt, 1998, 2001) among families in migrant-sending communities, government and corporations that magnify how migration is the ticket to better life (McKay, 2012) or its glorification as a heroic act (de los Reyes, 2013, 2014). Among the generations of the Martial Law and the EDSA revolutions, therefore, the ‘good life’ is hinged upon departure as professionals (e.g. nurses and engineers), workers in elementary occupations (e.g. construction and domestic workers) or mail-order brides or pen pals. Put simply, the good life in these generations is a function of remittances.
This chapter examines how the contemporary generation of young people construct the ‘good life’ in differential and new terms (de los Reyes, 2023; McKay & Brady, 2005) from previous generations. Using interviews and vision boards of left-behind children (15–18 years old), it argues that left-behind children critically appraise the ‘mobility imperative’. The chapter shows that there is a growing imagination of alternatives to the migration-induced good life among left-behind children, and therefore, they gradually refuse the ‘mobility imperative’. For them, the aspired good life consists of potentially being employees or entrepreneurs in their own villages and living a life with their own families (de los Reyes, 2019, 2020).
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Alicia Orea-Giner and Francesc Fusté-Forné
This research aims to examine Generation Z's perspectives of sustainable consumption in food tourism experiences, considering the drivers on food tourists' behavioural intents and…
Abstract
Purpose
This research aims to examine Generation Z's perspectives of sustainable consumption in food tourism experiences, considering the drivers on food tourists' behavioural intents and basing its analysis on the value-attitude-behaviour model of norm activation theory.
Design/methodology/approach
Using a qualitative design, 27 qualitative online surveys were conducted with Generation Z travellers who are also active on social media.
Findings
Results show that while they are aware of environmental knowledge and ethical food choices and think that sustainable food consumption improves individual and social wellbeing, the sustainability of food consumption is limited by factors such as time and budget. Also, results reveal that the eating habits of Generation Z people are more sustainable when they eat at home than when they travel. Theoretical and practical implications for food tourism management and marketing are described.
Originality/value
While food tourism has been largely investigated in recent years, little previous research has focused on the relationships between daily eating behaviours and sustainable consumption in food tourism experiences, especially from the perspective of Generation Z individuals and the influence of social media on individual and social food decisions.
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H.A. Kumara Swamy, Sankar Mani, N. Keerthi Reddy and Younghae Do
One of the major challenges in the design of thermal equipment is to minimize the entropy production and enhance the thermal dissipation rate for improving energy efficiency of…
Abstract
Purpose
One of the major challenges in the design of thermal equipment is to minimize the entropy production and enhance the thermal dissipation rate for improving energy efficiency of the devices. In several industrial applications, the structure of thermal device is cylindrical shape. In this regard, this paper aims to explore the impact of isothermal cylindrical solid block on nanofluid (Ag – H2O) convective flow and entropy generation in a cylindrical annular chamber subjected to different thermal conditions. Furthermore, the present study also addresses the structural impact of cylindrical solid block placed at the center of annular domain.
Design/methodology/approach
The alternating direction implicit and successive over relaxation techniques are used in the current investigation to solve the coupled partial differential equations. Furthermore, estimation of average Nusselt number and total entropy generation involves integration and is achieved by Simpson and Trapezoidal’s rules, respectively. Mesh independence checks have been carried out to ensure the accuracy of numerical results.
Findings
Computations have been performed to analyze the simultaneous multiple influences, such as different thermal conditions, size and aspect ratio of the hot obstacle, Rayleigh number and nanoparticle shape on buoyancy-driven nanoliquid movement, heat dissipation, irreversibility distribution, cup-mixing temperature and performance evaluation criteria in an annular chamber. The computational results reveal that the nanoparticle shape and obstacle size produce conducive situation for increasing system’s thermal efficiency. Furthermore, utilization of nonspherical shaped nanoparticles enhances the heat transfer rate with minimum entropy generation in the enclosure. Also, greater performance evaluation criteria has been noticed for larger obstacle for both uniform and nonuniform heating.
Research limitations/implications
The current numerical investigation can be extended to further explore the thermal performance with different positions of solid obstacle, inclination angles, by applying Lorentz force, internal heat generation and so on numerically or experimentally.
Originality/value
A pioneering numerical investigation on the structural influence of hot solid block on the convective nanofluid flow, energy transport and entropy production in an annular space has been analyzed. The results in the present study are novel, related to various modern industrial applications. These results could be used as a firsthand information for the design engineers to obtain highly efficient thermal systems.
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Janianton Damanik, Tri Kuntoro Priyambodo, Moh Edi Wibowo, Putu Diah Sastri Pitanatri and Suci Sandi Wachyuni
This study aims to explore the differences in the travel behaviour of Indonesian youth of Generations Y and Z in the pre-, during and post-travel stages and their associated use…
Abstract
Purpose
This study aims to explore the differences in the travel behaviour of Indonesian youth of Generations Y and Z in the pre-, during and post-travel stages and their associated use of information and communication technology.
Design/methodology/approach
Data were gathered through a questionnaire that was distributed via the internet for six weeks; 569 people provided their full responses. Chi-square tests and linear regression were used for data analysis.
Findings
These generations use digital media and word of mouth differently when searching for travel information. The differences are also apparent in the pre-, during and post-travel stages. Generation Z tends to use digital media and share travel experiences through a certain social media platform more frequently than Generation Y.
Research limitations/implications
This study covers the travel history prior to and during the COVID-19 pandemic and equalises the situation in these two periods. The number of samples was relatively small to capture the current population of both generations.
Practical implications
This study promotes a new understanding of the travel behaviours of the two generations based on the stages of the travel examined. The findings suggest that the travel industry can distinguish between promotional media and types of services to serve each of the generational cohorts more effectively.
Originality/value
To the best of the authors’ knowledge, this is the first study to reveal differences in travel behaviour between Generations Y and Z in Indonesia.
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Riane Cherylise Dalziel and Natasha De Klerk
The purpose of this paper is to examine the influence of two potentially important antecedents of female Generation Y consumers’ attitudes towards beauty products. In particular…
Abstract
Purpose
The purpose of this paper is to examine the influence of two potentially important antecedents of female Generation Y consumers’ attitudes towards beauty products. In particular, the impact of the media and groups is analysed through their influence on subjective norms.
Design/methodology/approach
Structural equation modelling analysis of moment structures was used to propose and test a research model by means of data from a substantial size of female Generation Y consumers.
Findings
The study’s results confirm that female Generation Y consumers have a favourable attitude towards beauty products and that this attitude is influenced by their subjective norms. Furthermore, the findings suggest that group influence, which includes the opinions of friends, family and peers and media influence both predict female Generation Y consumers’ favourable attitude towards beauty products via their influence on this segment’s subjective norms.
Practical implications
These results emphasise the strategic importance of incorporating subjective norms, together with media and group influence into beauty product marketing communication campaigns targeting female Generation Y consumers. Given that this generation is known to be prevalent users of social media and often consult online peer product reviews, such strategies should also be extended beyond traditional media platforms to include social media, particularly social media influencers and online product review platforms, thereby tapping into subjective norms and group influence.
Originality/value
This study contributes to understanding female Generation Y consumers’ attitudes towards beauty products, especially the combined influence of subjective norms and media and group influence on such attitudes.
Propósito
El propósito de este trabajo es examinar la influencia de dos antecedentes potencialmente importantes de las actitudes de las consumidoras de la Generación Y hacia los productos de belleza. En concreto, se estudia la influencia de los medios de comunicación y de los grupos a través de su influencia en las normas subjetivas.
Diseño/metodología/enfoque
Se empleó el análisis de modelos de ecuaciones estructurales de estructuras de momento para proponer y probar un modelo de investigación mediante datos de un tamaño considerable de consumidoras de la Generación Y.
Resultados
Los resultados del estudio confirman que las consumidoras de la Generación Y tienen una actitud favorable hacia los productos de belleza y que esta actitud está influenciada por sus normas subjetivas. Además, los resultados sugieren que la influencia del grupo, que incluye las opiniones de amigos, familiares y compañeros, y la influencia de los medios de comunicación predicen la actitud favorable de las consumidoras de la Generación Y hacia los productos de belleza a través de su influencia en las normas subjetivas de este segmento.
Implicaciones prácticas
Estos resultados enfatizan la importancia estratégica de incorporar las normas subjetivas, junto con la influencia de los medios de comunicación y del grupo, en las campañas de comunicación de la comercialización de productos de belleza dirigidas a las consumidoras de la Generación Y. Dado que se sabe que esta generación es la usuaria habitual de los medios sociales y suele consultar en línea las revisiones de los productos, esas estrategias también deberían ampliarse más allá de las plataformas de los medios de comunicación tradicionales para incluir los medios sociales, en particular las personas que ejercen influencia en los medios sociales, y las plataformas de revisión de productos en línea, aprovechando así las normas subjetivas y la influencia del grupo.
Originalidad/valor
Este estudio contribuye a comprender las actitudes de las consumidoras de la Generación Y respecto de los productos de belleza, especialmente la influencia combinada de las normas subjetivas y la influencia de los medios de comunicación y los grupos en esas actitudes.
研究目的
摘要
本文旨在研究两个重要的潜在因素,对Y世代女性消费者对美容产品态度的影响。具体来说,是通过媒体和群体对主观规范的影响来进行分析。
研究方法
本研究采用结构方程模型分析力矩结构,结合相当规模的Y世代女性消费者的数据,提出并检验研究模型。
研究结果
研究结果证实,Y世代女性消费者对美容产品持积极态度,而且这种态度受到她们主观规范的影响。此外,研究结果表明,群体影响(包括朋友、家人和同伴的意见)和媒体影响都能通过对Y世代女性消费者主观规范的影响来预测她们对美容产品的好感度。
实际意义
本文的研究结果强调了将主观规范和媒体、群体影响纳入针对Y世代女性消费者的美容产品营销传播活动的战略重要性。由于Y世代是社交媒体的普遍用户,并且经常查看其他用户评价,因此这种策略应该超越传统媒体平台,将社交媒体,特别是社交媒体网络红人和在线产品评论平台纳入其中,利用他们对消费者主观规范和群体的影响力。
研究价值
本研究有助于了解Y世代女性消费者对美容产品的态度,特别是主观规范和媒体、群体对这种态度的综合影响。
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