scholarly journals Influence of strands transposition on current distribution and power losses in windings of AC machines

2018 ◽  
Vol 12 (2) ◽  
pp. 86-92
Author(s):  
Branko Tomičić ◽  
Dunja Srpak

This paper analyses how the type of winding affects the current distribution and power losses in armature winding. Using finite element method, four different types of winding used in large asynchronous motors are analyzed: form-wound concentric, with and without transposition, and form-wound barrel, with and without transposition, for the stationary state. In two cases, the calculation shows clear differences between maximum currents in strands, a shift in their phases, and a resulting increase of AC resistance. In two other cases, minor deviations, smaller phase shift and smaller increase of AC resistance, are detected. It indicates that in certain types of armature winding of large motors the strands transposition leads to significant positive effects in terms of motor power, while in other cases it leads to unnecessary complications making the manufacture of large asynchronous machines more difficult, with relatively small positive effect on the motor power losses.

2020 ◽  
pp. 088740342090337
Author(s):  
Eric G. Lambert ◽  
Linda D. Keena ◽  
Stacy H. Haynes ◽  
Rose Ricciardelli ◽  
David May ◽  
...  

While the issue of trust is theoretically essential for the effective operation of correctional organizations, few researchers have examined how the different types of trust are related to salient outcomes for staff. In this study, we examined the effects of coworker, supervisor, and management trust on the job involvement, job satisfaction, and organizational commitment of 322 Southern U.S. correctional staff. The types of workplace trust, however, varied in their effects. Specifically, multivariate analysis indicated only management trust had a significant positive effect on job involvement, but both coworker trust and management trust had significant positive effects on job satisfaction, whereas both supervisor trust and management trust had significant positive effects on organizational commitment. The current findings support the overall contention that workplace trust plays an important role in shaping prison staff job involvement, job satisfaction, and organizational commitment. The results underscore the need for improving perceptions of trust in the workplace, particularly management trust.


Author(s):  
Yousef Elgimati ◽  
Ahmed Alrasheed ◽  
Abdalla Mohamed Bashir

The purpose of this paper was to measure the effect of a COVID-19 on social, psychological, economic, and health conditions in Libyan society. This study was undertaken through a questionnaire survey using the Google Form survey questionnaires in order to collect the data. A random sampling method was used from 1st June to 15th July 2020by obtaining greater insight into the issue. A result of this study revealed that the COVID-19 had a different effect on four dimensions (social, psychological economic, and health conditions). The findings of the study indicate that there is a small positive effect on social, middle, and above middle positive effects on psychological and economic respectively and high positive effect on health conditions with various percentages in Libyan society. This has been one of the first academic studies on the COVID-19 on social, psychological, economic, and health conditions addressed the Libyan society. Arguably, many of the areas covered in this study warrant more specific and in-depth investigation. The researchers hope that this paper will be beneficial to both Libyan people and the government in improving and developing the social aspects to avoid spreading COVID-19 in the future.


2021 ◽  
pp. 073346482098363
Author(s):  
Elham Esfandiari ◽  
William C. Miller ◽  
Maureen C. Ashe

Telehealth interventions improve health outcomes by increasing access to care. We conducted a systematic review to synthesize evidence on the effect of telehealth interventions compared with no intervention or usual care for older adults with pre-frailty or frailty for physical function, quality of life (QOL), and frailty. We searched for randomized controlled trials (RCTs) in MEDLINE, PubMed, Embase, CINAHL, Cochrane, PsycINFO, and SPORTDiscus. Two authors reviewed records and assessed risk of bias. A narrative synthesis of findings was conducted. When appropriate, the standard mean difference (SMD) was used to compare telehealth interventions with control conditions. We used GRADE to determine the certainty of the evidence. Twelve RCTs were included. Low certainty evidence highlighted positive effects for the function and mental component of QOL favoring telehealth interventions (SMD = 0.31, 95% CI = [0.15, 0.47]; and SMD = 0.43, 95% CI = [0.22, 0.64], respectively). Despite a small positive effect of telehealth interventions, insufficient, and low certainty evidence precludes making definitive recommendations.


2021 ◽  
Vol 12 ◽  
Author(s):  
Huy P. Phan ◽  
Bing H. Ngu

We tested a theoretical-conceptual model that introduced our recently developed psychological concept, termed as psychological processes, which is defined as “a person’s continuing frame of mind to focus on disposition toward strong resolute, structured thoughts and organization, and aspiration to strive for educational success.” This proposition is innovative as it considers the notion that a person’s mindset is malleable and, importantly, subjects to social experiences derived from a situated social context. Moreover, from our definition, we contend that psychological processes, as a distinct construct, is “latent,” or underlying, with three comparable psychological attributes: personal resolve, effective functioning, and personal striving. Our conceptualization, acknowledging the importance of social contexts and individualized experience and personal belief, proposed that perceived social experiences (i.e., positive versus negative), as a source of information, would shape a student’s psychological processes, his/her state of motivation, and engagement in different types of adaptive outcomes. Moreover, from our point of view, psychological processes would act as a predictor as well as a potential mediator of motivation and engagement in different types of adaptive outcomes. In a similar vein, from the positive effect of psychological processes, motivation could act as a predictor as well as a mediator of adaptive outcomes. Structural equation modeling, from Taiwanese university students’ (N = 739) responses to various Likert-scale measures, showed support for our original a priori model – for example, the positive effects of perceived social experiences on psychological processes (β = 0.81, p < 0.001) motivation (β = 0.61, p < 0.001), and adaptive outcomes (β = 0.36, p < 0.01), and the positive effect of psychological processes on motivation (β = 0.31, p < 0.01). Interestingly, we also found some interesting findings with regard to the effects of measured indicators – for example, the positive effect of personal resolve, as a measured indicator, on adaptive outcomes (β = 0.28, p < 0.001), and the effect of self-efficacy, as a measured indicator, on academic liking experience, also a measured indicator (β = 0.12, p < 0.01). Overall, the results established have a wide range of implications for consideration – for example, the development of an educational program and/or instructional design that could promote and foster positive learning experiences.


2016 ◽  
Vol 86 (3-4) ◽  
pp. 127-151 ◽  
Author(s):  
Zeshan Ali ◽  
Zhenbin Wang ◽  
Rai Muhammad Amir ◽  
Shoaib Younas ◽  
Asif Wali ◽  
...  

While the use of vinegar to fi ght against infections and other crucial conditions dates back to Hippocrates, recent research has found that vinegar consumption has a positive effect on biomarkers for diabetes, cancer, and heart diseases. Different types of vinegar have been used in the world during different time periods. Vinegar is produced by a fermentation process. Foods with a high content of carbohydrates are a good source of vinegar. Review of the results of different studies performed on vinegar components reveals that the daily use of these components has a healthy impact on the physiological and chemical structure of the human body. During the era of Hippocrates, people used vinegar as a medicine to treat wounds, which means that vinegar is one of the ancient foods used as folk medicine. The purpose of the current review paper is to provide a detailed summary of the outcome of previous studies emphasizing the role of vinegar in treatment of different diseases both in acute and chronic conditions, its in vivo mechanism and the active role of different bacteria.


2019 ◽  
Vol 3 (4) ◽  
pp. 209-222
Author(s):  
Philipp K. Görs ◽  
Henning Hummert ◽  
Anne Traum ◽  
Friedemann W. Nerdinger

Digitalization is a megatrend, but there is relatively little knowledge about its consequences for service work in general and specifically in knowledge-intensive business services (KIBS). We studied the impact of digitalization on psychological consequences for employees in tax consultancies as a special case of KIBS. We compare two tax consulting jobs with very different job demands, those of tax consultants (TCs) and assistant tax consultants (ATCs). The results show that the extent of digitalization at the workplace level for ATCs correlates significantly positively with their job satisfaction. For TCs, the same variable correlates positively with their work engagement. These positive effects of digitalization are mediated in the case of ATCs by the impact on important job characteristics. In the case of TCs, which already have very good working conditions, the impact is mediated by the positive effect on self-efficacy. Theoretical and practical consequences of these results are discussed.


2021 ◽  
Vol 13 (15) ◽  
pp. 8633
Author(s):  
Yuhan Ge ◽  
Qing Yuan ◽  
Yaxi Wang ◽  
Keunsoo Park

In today’s increasingly competitive coffee industry, the point of running a good coffee shop is no longer to run a coffee and beverage shop simply, but to focus on the quality of service and the value that customers feel as a result. Previous studies have mainly discussed the customer satisfaction and behavioral intention of restaurants, while few studies have explored the influencing factors of customer satisfaction and behavioral intention of chain coffee shops. Given that the perceived service quality theory and DINESERV model can effectively predict customer satisfaction and behavioral intention, this study took 385 consumers in the first Starbucks Reserve flagship store in China as survey objects. SmartPLS 3.0 software was used to explore the relationship among respondents’ perceived service quality, customer perceived value, satisfaction, and behavioral intention. The results show that service quality has a partially significant positive effect on perceived value. Perceived service quality and customers’ perceived value both have significant positive effects on satisfaction. Customers’ satisfaction has a significant positive effect on their behavioral intention. These results indicate that enterprises should strengthen the emotional bond between consumers and enterprises and improve the reliability, assurance, and empathy of perceived service quality to create a better emotional resonance between consumers and the Starbucks brand to improve customer satisfaction. At the same time, it should also promote the symbolic perceived value of Chinese consumers to Starbucks to realize the sustainable development of coffee-shop operation and consumer repurchase. This study expands the research on the service quality, perceived value, and behavioral intention of coffee chain enterprises in the context of non-habitual coffee-drinking countries. Moreover, it provides case support for the operation and research of regional cultural consumption habits of international catering chain enterprises.


2021 ◽  
Vol 13 (2) ◽  
pp. 579
Author(s):  
Caroline Reimann ◽  
Fernando Carvalho ◽  
Marcelo Duarte

The present investigation aims study the sustainability of the business model of the Portuguese SMEs operating in the B2B International market analyzing the influence of dynamic marketing capabilities and adaptive marketing capabilities in their international marketing performance. It will also analyze the moderating effects of Competitive Intensity within this international scenario. A quantitative study was developed, using a questionnaire as a research method. In total, 335 valid responses were collected from Portuguese SMEs in June 2020. To test the hypotheses, multiple hierarchical regressions were performed. As for the analyzes involving Competitive Intensity environments, namely low and high intensity, dummies were developed to evaluate the different effects produced by the capacities in the International Marketing Performance. This study shows the positive impact of the dynamic marketing capabilities and adaptive marketing capabilities on the international marketing performance of the surveyed companies, essentially from the product development management, supply chain management, vigilant market learning and open marketing. when in a low competitive intensity environment only dynamic marketing capabilities had a positive effect on performance, but in a high, competitive, intensity environment both dynamic marketing capabilities and adaptive marketing capabilities showed positive effects in relation to performance. This study innovates by bringing international marketing, through two marketing capacities, from the perspective of SMEs that perform B2B activities.


2021 ◽  
Vol 13 (2) ◽  
pp. 712
Author(s):  
Andrea Okanović ◽  
Jelena Ješić ◽  
Vladimir Đaković ◽  
Simonida Vukadinović ◽  
Andrea Andrejević Panić

Growing environmental problems and increasing requirements of green jobs force universities around the world not only to transform their curricula but also to enrich existing ones with contents related to the promotion of sustainable development. This paper aims to show the importance of measuring and monitoring the share of green contents in all university activities, as only in that way it is possible to monitor trends and give realistic assessments of their effect and importance. The paper presents a comparative analysis of different types of methodologies for assessing sustainable activities at universities as well as research conducted at the University of Novi Sad in Serbia and its comparison with the University of Gothenburg (Sweden). This research aims to point out the importance of increasing competitiveness in higher education through assessment of green content in a curriculum and its promotion. In this way, through eco-labeling methodology, it would be easier to identify those contents that, in a certain share, contribute to the promotion of sustainable development. Furthermore, this methodology can easily be extended across the country and the region, which would bring positive effects to all stakeholders in higher education.


Animals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1132
Author(s):  
Sarah Schwarzkopf ◽  
Asako Kinoshita ◽  
Jeannette Kluess ◽  
Susanne Kersten ◽  
Ulrich Meyer ◽  
...  

Development of calves depends on prenatal and postnatal conditions. Primiparous cows were still maturing during pregnancy, which can lead to negative intrauterine conditions and affect the calf’s metabolism. It is hypothesized that weaning calves at higher maturity has positive effects due to reduced metabolic stress. We aimed to evaluate effects of mothers’ parity and calves’ weaning age on growth performance and blood metabolites. Fifty-nine female Holstein calves (38.8 ± 5.3 kg birth weight, about 8 days old) were used in a 2 × 2 factorial experiment with factors weaning age (7 vs. 17 weeks) and parity of mother (primiparous vs. multiparous cows). Calves were randomly assigned one of these four groups. Live weight, live weight gain and morphometry increased over time and were greater in calves weaned later. Metabolic indicators except total protein were interactively affected by time and weaning age. Leptin remained low in early-weaned calves born to primiparous cows, while it increased in the other groups. The results suggest that weaning more mature calves has a positive effect on body growth, and calves born to primiparous cows particularly benefit from this weaning regimen. It also enables a smooth transition from liquid to solid feed, which might reduce the associated stress of weaning.


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