1,721,048 research outputs found
Flow and aerodynamic noise control of a circular cylinder by local blowing
Full text linkIn this experimental study, the impact of symmetric local blowing on suppressing the vortex-induced noise of a circular cylinder was investigated. A highly instrumented cylinder with pressure taps and a series of blowing chambers was used to inject air along the span (seven times the cylinder diameter) at circumferential anglesθb=±41∘, ±90∘ and ±131∘ corresponding to the boundary layer, shear layers on the cylinder and separated shear layers, respectively. The investigation aimed to understand the noise reduction mechanism of local blowing by conducting near-field pressure and far-field noise measurements in synchronisation with flow field velocity measurements. Near-field pressure was measured around the circumference of the cylinder using a remote-sensing technique and planar particle image velocimetry was implemented to measure the velocity of the wake flow field at a diameter-based Reynolds number of Re=7×104. The results revealed that the interaction of the rolling up separated shear layers, under the influence of high-momentum fluid travelling from the free stream to the wake, induced significant vertical flow movement in the vortex-formation region. This movement led to strong alternating surface pressure fluctuations at the cylinder's shoulders, contributing to the scattering of noise. It was demonstrated that local blowing delayed vortex shedding for all cases, except at θb=±90∘, , which elongated the shear layers and pushed the high-momentum transfer area farther downstream. The application of local blowing at θb=±41∘ was particularly effective in increasing the vortex formation size due to reduced entrainment of fluid-bearing vorticity
Aeroacoustic investigation of active base blowing applied to a structured porous cylinder
No full textThe influence of local blowing (LB) through a structured porous-coated cylinder (SPCC) as a hybrid method (HM) for vortex-induced noise suppression of a circular cylinder was investigated experimentally. The air blowing was applied at the base of the cylinder from the front stagnation point (���� = 180○) over a long span length (seven times the outer diameter of the cylinder). To better understand the underlying noise reduction mechanism of HM compared to the other methods tested here (i.e., SPCC and LB without SPCC at ���� = 180○), near-field pressure was synchronised with far-field noise measurements. In addition, planar particle image velocimetry measurements were carried out to visualise the flow field and wake development back of the cylinder under the influence of different methods. The results showed that HM causes a significant reduction in the tonal and broadband noises produced by the baseline, specifically relative to LB at ���� = 180○, yet the HM performance was very similar to that of the SPCC. The coherence between near- and far-field pressure demonstrated that the surface pressure fluctuations imposed at the shoulders of the cylinder (approximately in the pre- and post-separation regions) at the fundamental vortex shedding frequency have the most contribution to the tonal noise produced by the baseline. It was observed that SPCC and HM suppress vertical velocity fluctuations close to the cylinder significantly with a very similar delay in rolling up the shear layers into vortex structures and pushing the recirculation bubbles further downstream in comparison to the baseline and LB at ���� = 180○. In these cases, the energy content of surface pressure fluctuations is reduced as a result of vertical flow movement during vortex shedding, and the acoustic pressure field cannot propagate as sound waves to the far-field
Peers and social network in the entrepreneurial development: a systematic literature review
No full textThe literature on how social factors influences the entrepreneurship process has recently developed considerably. However, this literature is fragmented and this prevents scholars from elaborating valuable implications for entrepreneurship education. In this paper, practicing a systematic literature review, we synthesize the research on social networks and peer to classify their impact on entrepreneurial intention. The aim is to identify how and in what direction these mechanisms can operate to strengthen entrepreneurship education effectiveness. We found that the social network and peer networking literature has shown the significant influence of both variables on opportunity identification and entrepreneurial intention as a primary phase of the entrepreneurship process. We then propose a framework to summarize our findings by presenting the implication of our result in the entrepreneurship education filed
Why a systematic literature review is a powerful tool for gaining insights into entrepreneurship: application to entrepreneurial teams in the venture creation process
No full textA systematic literature review (SLR) is a method to collect and synthesize existing research findings systematically. By providing an illustrative example of how to conduct an SLR focusing on entrepreneurial teams and venture creation, this chapter outlines the key steps for its adoption. In particular, we demonstrate how to compile a comprehensive overview of the existing literature and identify potential research gaps or areas needing further exploration. The pros and cons of using an SLR are also shown. Overall, by highlighting the main steps of an SLR, presenting an example in the context of entrepreneurial teams, discussing the limitations of the approach, and suggesting alternative methodologies, researchers can gain a comprehensive understanding of how to utilize an SLR effectively and make informed decisions about when and how to employ complementary approaches
The relationship of parenting styles of parents and exploration and commitment in the identity formation of occupations for late adolescents: a study on the identity formation of late adolescents in the city and the village
No full textAmi Maryami, The Relationship of Parenting Styles of Parents and Exploration and Commitment on the Identity Formation of Occupations for Late Adolescents (A Study on the Identity Formation of Late Adolescents in the City and the Village). The research aims to find out 1) the relation of parenting styles of parents to exploration and commitment to the identity formation of occupations of late adolescents, 2) the different styles of parenting by parents, and 3) exploration and commitment differences on the identity formation of occupations of late adolescents, among those who live in the village and the city. The object of research is high school students who were in the third year (late adolescents) who live in Bandung Regency and the City of Bandung. The sampling technique used was two-cluster sampling, and n = 116 was obtained for late adolescents in the village and 116 for the late adolescents in the city. To examine the hypothesis in order to see whether it has a correlation or not, Pearson Correlation was used, while the t-test was used to see whether there were any differences. The research result revealed that there is a correlation between parenting styles of parents and exploration and commitment on identity formation of occupations of late adolescents who live in the village and the city. There is no difference in parenting styles of parents who live in the village and the city, and there is no difference in identity formation of occupations of late adolescents in the village and the city, but there is a difference in commitment in identity formation of occupations of late adolescents among those in the village and the city
The Relationship of Parenting Styles of Parents and Exploration and Commitment in the Identity Formation of Occupations for Late Adolescents: A Study on the Identity Formation of Late Adolescents in the City and the Village
Full text linkAmi Maryami, The Relationship of Parenting Styles of Parents and Exploration and Commitment on the Identity Formation of Occupations for Late Adolescents (A Study on the Identity Formation of Late Adolescents in the City and the Village). The research aims to find out 1) the relation of parenting styles of parents to exploration and commitment to the identity formation of occupations of late adolescents, 2) the different styles of parenting by parents, and 3) exploration and commitment differences on the identity formation of occupations of late adolescents, among those who live in the village and the city. The object of research is high school students who were in the third year (late adolescents) who live in Bandung Regency and the City of Bandung. The sampling technique used was two-cluster sampling, and n = 116 was obtained for late adolescents in the village and 116 for the late adolescents in the city. To examine the hypothesis in order to see whether it has a correlation or not, Pearson Correlation was used, while the t-test was used to see whether there were any differences. The research result revealed that there is a correlation between parenting styles of parents and exploration and commitment on identity formation of occupations of late adolescents who live in the village and the city. There is no difference in parenting styles of parents who live in the village and the city, and there is no difference in identity formation of occupations of late adolescents in the village and the city, but there is a difference in commitment in identity formation of occupations of late adolescents among those in the village and the city
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
On the role of team passion in inventing, founding and developing: what happens in the early stages of entrepreneurship?
Full text linkPurpose
Drawing on the Broaden-and-build theory, the study investigates the impact of team entrepreneurial passion (TEP) on team performance. This study further examines the mediating role of team cooperation between TEP and team performance. Thus, by expanding the conceptual model of TEP, the authors examine how three domains of TEP, namely inventing, founding and developing affect the entrepreneurial outcomes in the early stages of entrepreneurship.
Design/methodology/approach
Survey data were collected from 29 entrepreneurial teams, and the proposed relationships were assessed through Smart-PLS 3.2.8 structural equation modeling (SEM) tool.
Findings
Regarding the domains of TEP, the authors' findings show that the TEP for inventing is positively related to team performance. As for the influences of TEP for inventing and TEP for developing, both are the most beneficial for entrepreneurial outputs, such as team members' abilities to recognize and exploit opportunities.
Originality/value
Although there is an increased scholars' interest in entrepreneurial passion, there is a lack of research that examines the enabling factors and outcomes of entrepreneurial passion at the team level. This study is among the earliest research studies that not only empirically explores the relationships between TEP and team performance but also illustrates how each domain of TEP uniquely influences entrepreneurial outcomes by extending existing studies on entrepreneurial passion
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