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1 – 10 of 389D.P. Mok, W.A. Wall, M. Bischoff and E. Ramm
The present study focusses on algorithmic aspects related to deformation dependent loads in non‐linear static finite element analysis. If the deformation dependency is considered…
Abstract
The present study focusses on algorithmic aspects related to deformation dependent loads in non‐linear static finite element analysis. If the deformation dependency is considered only on the right hand side, a considerable increase in the number of iterations follows. It may also cause failure of convergence in the proximity of critical points. If in turn the deformation dependent loading is included within the consistent linearization, an additional left hand side term emerges, the so‐called load stiffness matrix. In this paper several numerical test cases are used to show and quantify the influence of the two different approaches on the iteration process. Consideration of the complete load stiffness matrix may result in a cumbersome coding effort, different for each load case, and in certain cases its derivation is even not practicable at all. Therefore also several formulations for approximated load stiffness matrices are presented. It is shown that these simplifications not only reduce the additional effort for linearization and implementation, but also keep the iterative costs relatively small and still allow the calculation of the entire equilibrium path.
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Lisa Schwegmann, Volkmar Zabel and Steffen Koch
Adaptive load-bearing structures pursue the approach of saving mass within a load-bearing structure by adding external energy, thus saving materials and resources. This paper…
Abstract
Purpose
Adaptive load-bearing structures pursue the approach of saving mass within a load-bearing structure by adding external energy, thus saving materials and resources. This paper provides an overview of current research developments and shows some examples of existing prototypes.
Design/methodology/approach
First, basic terms and definitions from the research field of adaptive structures are introduced. After a brief historical insight, the numerical methods and prototypes used are presented as examples. The paper concludes with a summary of the state-of-the-art and open questions.
Findings
The current state of the art shows that the idea of adaptive structures offers great potential for more sustainability and resource efficiency in the construction industry. However, it also shows that research is still at the basic stage and that there are still some gaps in research.
Originality/value
The implementation of adaptive load-bearing structures is just one of many different approaches to greater sustainability in the construction sector. The issue of adaptive structures is a highly interdisciplinary field of research. The following paper is a literature review intended to summarize and critically evaluate the state-of-the-art research in this field. In the final section, some open questions are addressed, indicating that this research topic is still evolving.
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Tehreem Fatima, Ahmad Raza Bilal, Muhammad Kashif Imran and Ambreen Sarwar
The combination of action and process has remained the attention of the psychology of entrepreneurship research. Moreover, special attention has also been paid to the whens and…
Abstract
Purpose
The combination of action and process has remained the attention of the psychology of entrepreneurship research. Moreover, special attention has also been paid to the whens and hows of entrepreneurial psychological training. Keeping this in view the current study has tested the impact of individual entrepreneurial orientation (IEO) training on small business entrepreneurial career resilience. Using action regulation theory (ART), a serial mediation model of IEO behaviour and entrepreneurial career adaptability is hypothesised.
Design/methodology/approach
This study used a longitudinal randomised controlled field experiment in which the data were collected at four points. A total of 546 small business owners from Lahore, Pakistan, participated in this research (training group = 265, control group = 281). The data were analysed using ANCOVAs and PROCESS Model 6.
Findings
The research has found that IEO training impacts the entrepreneurial career resilience of small business owners through the development of IEO behaviour and career adaptability.
Originality/value
This experimental inquiry is a novel attempt to extend the career-related outcomes of IEO training (career resilience) based on ART through the mediating role of IEO behaviour and career adaptability. In addition, it has tested the IEO training in the developing country of Pakistan, which is a relevant context for enhancing its socio-economic growth.
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Torgeir Aadland, Gustav Hägg, Mats A. Lundqvist, Martin Stockhaus and Karen Williams Middleton
To increase the understanding of how entrepreneurship education impacts entrepreneurial careers, the purpose of the paper is to investigate the role that a venture creation…
Abstract
Purpose
To increase the understanding of how entrepreneurship education impacts entrepreneurial careers, the purpose of the paper is to investigate the role that a venture creation program (VCP) might have in mitigating or surpassing a lack of other antecedents of entrepreneurial careers. In particular, the authors focus on entrepreneurial pedigree and prior entrepreneurial experience.
Design/methodology/approach
Data from graduates of VCPs at three universities in Northern Europe were collected through an online survey. Questions addressed graduate background prior to education, yearly occupational employment subsequent to graduation and graduates' own perceptions of entrepreneurial activity in employment positions. The survey was sent to 1,326 graduates and received 692 responses (52.2% response rate).
Findings
The type of VCP, either independent (Ind-VCP) or corporate venture creation (Corp-VCP), influenced the mitigation of prior entrepreneurial experience. Prior entrepreneurial experience, together with Ind-VCP, made a career as self-employed more likely. However, this was not the case for Corp-VCP in subsequently choosing intrapreneurial careers. Entrepreneurial pedigree had no significant effect on career choice other than for hybrid careers.
Research limitations/implications
Entrepreneurial experience gained from VCPs seems to influence graduates toward future entrepreneurial careers. Evidence supports the conclusion that many VCP graduates who lack prior entrepreneurial experience or entrepreneurial pedigree can develop sufficient entrepreneurial competencies through the program.
Originality/value
This study offers novel evidence that entrepreneurship education can compensate for a lack of prior entrepreneurial experience and exposure for students preparing for entrepreneurial careers.
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Marcelo André Machado and Viviane Bischoff
This paper aimed to evaluate the differences in the use and knowledge of export promotion programs (EPPs) between Brazilian SMEs that internationalized early and SMEs that…
Abstract
Purpose
This paper aimed to evaluate the differences in the use and knowledge of export promotion programs (EPPs) between Brazilian SMEs that internationalized early and SMEs that internationalized in a gradual, traditional fashion. Additionally, it tested hypotheses that distinguish these two types of SME internationalization processes in an emerging market context.
Design/methodology/approach
The authors tested four hypotheses in a sample of 540 SME Brazilian exporters. The sample was divided into two groups according to the born global (BG) criteria: 379 SMEs with gradual or traditional internationalization (TI) and 161 SMEs with early internationalization (EI).
Findings
The results indicate that Brazilian EI SMEs operate in more countries and continents than TI SMEs. In emerging countries such as Brazil, the domestic market continues to play an important role both for SMEs that internationalize early and those whose process is slower. Even though logistic regression could not classify the sample of TI and EI SMEs according to their knowledge about EPPs, the results led to the idea that EI SMEs currently use more specific EPPs than do TI SMEs.
Practical implications
Managers of successful SMEs from emerging markets need to incorporate EPPs into their internationalization strategy. In emerging markets with large domestic markets, SME managers can meet their growth needs by exploiting opportunities in both domestic and international markets.
Originality/value
Research on the early internationalization of SMEs has long focused on SMEs from developed markets and on internal factors. Moreover, the effects of EPPs on the firm' performance of large and SME firms has also been the subject of study. The value of this paper relies on the intersection of EPPs and the early internationalization of SMEs, even for firms in developed markets.
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Daniel Vankov, David Kozma, Borislav Vankov, Johan Chiers, Martin Galanternik and Lin Wang
Entrepreneurship can help tackle economic problems, such as unemployment. It is often promoted through education programs. There is a limited comprehensive and rigorous…
Abstract
Purpose
Entrepreneurship can help tackle economic problems, such as unemployment. It is often promoted through education programs. There is a limited comprehensive and rigorous understanding of how entrepreneurship education programs and their ubiquitous distance delivery affect young people's entrepreneurial self-efficacy and intention, particularly in non-formal settings. The purpose of this study is to address this gap.
Design/methodology/approach
Underpinned by the Social Cognitive Theory, this paper investigates the effects of one entrepreneurship education program in a study with 145 young people from five countries aged 18 to 25 years, 62 Intervention and 83 Control participants. The program's impact on the participants' entrepreneurial intention and self-efficacy (across six sub-dimensions) was assessed in a one-off two-week quasi-experiment. Ex-ante and ex-post self-reported data were collected about the participants.
Findings
One-way analyses of covariance were performed to assess separately for changes in the Intervention participants' answers, relative to the Control group. The results of this study suggest the program significantly affected all measures.
Originality/value
These findings contribute to the discussions on the education programs’ effectiveness in promoting entrepreneurship. As a result, they may contribute to entrepreneurship education overcoming geographical and socio-economic hurdles (cost, time and entry barriers) to advance the development of industry, economy and community worldwide.
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Md. Mizanur Rahman, Noor Azman Ali, Amer Hamzah Jantan, Zuraina Dato' Mansor and Md. Saidur Rahaman
The purpose of this study is to confirm that work to family conflict (W to FC), family to work conflict (F to WC) and work family balance (WFB) are the predictors of job…
Abstract
Purpose
The purpose of this study is to confirm that work to family conflict (W to FC), family to work conflict (F to WC) and work family balance (WFB) are the predictors of job satisfaction (JS) for Malaysian academic community. To achieve the fundamental objective, the authors first test the direct (structural model) effects of W to FC and F to WC on JS. Secondly, using mediation model, the indirect effects of WFB were calculated through W to FC, F to WC and JS.
Design/methodology/approach
Using convenience sampling, the data was collected from 280 academic people who work at private universities in Malaysia. Structural equation modelling technique was applied to complete the data analyses procedures.
Findings
The findings revealed that W to FC and F to WC have negative significant effects on JS. Besides, WFB partially mediates only the relationship between W to FC and JS while no mediation effect was found for F to WC and JS.
Research limitations/implications
All the research variables in this study were individual-level variables, thus it is suggested to use some organizational and national level variables such as religion and culture as they might be good intervening variables for predicting JS.
Practical implications
Using the findings of this research, the Malaysian private universities community can take some necessary initiatives to mitigate work family conflict (W-FC) and ensure WFB and JS that might enhance the standard of higher education in Malaysia.
Originality/value
To the best of the authors’ knowledge, this is the first attempt to test the mediation effect of WFB in the relationship between both directions of W-FC and JS of employees from the perspective of Malaysia (a collectivist community).
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Nikolay Asmolovskiy, Anton Tkachuk and Manfred Bischoff
Current procedures of buckling load estimation for thin-walled structures may provide very conservative estimates. Their refinement offers the potential to use structure and…
Abstract
Purpose
Current procedures of buckling load estimation for thin-walled structures may provide very conservative estimates. Their refinement offers the potential to use structure and material properties more efficiently. Due to the large variety of design variables, for example laminate layup in composite structures, a prohibitively large number of tests would be required for experimental assessment, and thus reliable numerical techniques are of particular interest. The purpose of this paper is to analyze different methods of numerical buckling load estimation, formulate simulation procedures suitable for commercial software and give recommendations regarding their application. All investigations have been carried out for cylindrical composite shells; however similar approaches are feasible for other structures as well.
Design/methodology/approach
The authors develop a concept to apply artificial load imperfections with the aim to estimate as good as possible lower bounds for the buckling loads of shells for which the actual physical imperfections are not known. Single and triple perturbation load approach, global and local dynamic perturbation approach and path following techniques are applied to the analysis of a cylindrical composite shell with known buckling characteristics. Results of simulations are compared with published experimental data.
Findings
A single perturbation load approach is reproduced and modified. Buckling behavior for negative values of the perturbation load is examined and a pattern similar to a positive perturbation load is observed. Simulations with three perturbation forces show a decreased (i. e. more critical) value of the buckling load compared to the single perturbation load approach. Global and local dynamic perturbation approaches exhibit a behavior suitable for lower bound estimation for structures with arbitrary geometries.
Originality/value
Various load imperfection approaches to buckling load estimation are validated and compared. All investigated methods do not require knowledge of the real geometrical imperfections of the structure. Simulations were performed using a commercial finite element code. Investigations of sensitivity with respect to a single perturbation load are extended to the negative range of the perturbation load amplitude. A specific pattern for a global perturbation approach was developed, and based on it a novel simulation procedure is proposed.
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Meimei Zhao, Dalong Li, Yaqin Xu, Xueying Bu, Chen Shen, Libo Wang, Yu Yang and Jingwen Bai
This paper aims to explore the adsorption kinetics of syringin from Syringa oblata Lindl. leaves on macroporous resin and develop an efficient, simple and recyclable technology…
Abstract
Purpose
This paper aims to explore the adsorption kinetics of syringin from Syringa oblata Lindl. leaves on macroporous resin and develop an efficient, simple and recyclable technology for the separation and purification of syringin.
Design/methodology/approach
Static adsorption and desorption properties of six resins were tested to select a suitable resin for the purification of syringin. Langmuir and Freundlich isotherm models were used to estimate the adsorption behavior of syringin on AB-8 resin. Breakthrough point and eluent volume were determined by dynamic adsorption and desorption tests. High-performance liquid chromatography-electrospray ionization-mass spectrometry was applied to identify the syringin in the purified product [syringin product (SP)]. Antioxidant and antibacterial activities of SP in vitro were evaluated by free radical scavenging ability and biofilm formation inhibitory tests.
Findings
AB-8 exhibited the most suitable adsorption and desorption capacity. Adsorption isotherm parameters indicated favorable adsorption between AB-8 and syringin. The optimal results were as follows: for adsorption, the sample concentration was 1.85 mg/mL, the sample volume was 3.5 bed volume (BV), the flow rate was 0.5 mL/min; for desorption, the ethanol concentration was 70%, the elution volume was 2.5 BV, the elution velocity was 1.0 mL/min. SP with 80.28% syringin displayed the potent antioxidant activities and inhibitory effects on biofilm formation of Streptococcus suis.
Originality/value
To the best of authors’ knowledge, there are no reports on purifying syringin from Syringa oblata Lindl. leaves using macroporous resins. This paper may also provide a theoretical reference for the purification of other phenylpropanoid glucosides.
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Wanniwat Pansuwong, Sarana Photchanachan and Pusanisa Thechatakerng
This study aims to examine capital and competency variables – human capital, social capital and personal entrepreneurial competencies – in relation to social innovation…
Abstract
Purpose
This study aims to examine capital and competency variables – human capital, social capital and personal entrepreneurial competencies – in relation to social innovation development and growth of social enterprises in a developing country with an emerging social enterprise sector: Thailand.
Design/methodology/approach
A hypothetical-deductive approach was adopted and a quantitative survey by questionnaire was applied to collect data from owners/top management of 103 social enterprises in Thailand. The data were used to test hypotheses and further analysed using partial least squares technique.
Findings
The results revealed that there were positive direct and indirect (mediating) relationships between human capital, social capital, personal entrepreneurial competencies and social innovation development and growth of Thai social enterprises. Skills and training were key determinants of human capital, whereas social interaction, trust, social identification and shared knowledge were key determinants of social capital which affected social innovation development. Goal orientation, information seeking, opportunity seeking, persuasion and self-confidence were key determinants of entrepreneurial competencies that also affected social innovation development. This study ultimately revealed the mediating effects of social innovation development on the relationships between capital and competency variables and the growth of social enterprises.
Originality/value
This study fills the research gap, from the theoretical perspective, by identifying capital and competency variables as well as their additional determinants that are divergent from previous literature, which can potentially influence the social innovation development of social enterprises, and where only limited research is evidenced. From an empirical perspective, this study attempts to investigate the associations between these variables and growth indicators in the context of social enterprises in a developing nation, where its sector is in its infancy. This study further helps to clarify the existence of the direct and indirect (mediating) effects of social innovation development in the context of the economic and social accomplishments of social enterprises.
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