Power analysis and simulation of a vehicle under combined loads

This paper presents an analytical model of fuel consumption (AMFC) to coordinate the driving power and manage the overall fuel consumption for an internal combustion engine vehicle. The model calculates the different loads applied on the vehicle including road-slope, road-friction, wind-drag, accessories, and mechanical losses. Also, it solves the combustion equation of the engine under different working conditions including various fuel compositions, excess airs and air inlet temperatures. Then it determines the contribution of each load to signify the energy distribution and power flows of the vehicle. Unlike the conventional models in which the vehicle speed needs to be given as an input, the developed model can predict the vehicle speed and acceleration under different working conditions by allowing the speed to vary within a predefined range only. Furthermore, the model indicates the ways to minimises the vehicles' fuel consumption under various driving conditions. The results show that the model has the potential to assist in the vehicle energy management.

Impact of leadership and power on successful ERP adoption

Case study research investigating the impact of culture upon a Hong Kong based construction contractor's leadership in implementing an Enterprise Resource Planning (ERP) system unearthed rich data relating to the predominantly Hong Kong Chinese cultural perspective of power, leadership and followership. Intimately involved participants were surveyed using both structured and semi-structured interviews. The study's focus was centred upon the interplay between culture, power and how people interact with the way that the ERP is used and how teams of people involved in the ERP implementation, perceived the supportive nature of the organisation's leadership in deploying the ERP. A culturally sensitive empowering leadership style was a significant issue in successfully project managing and deploying the ERP. Understanding how teams and their leaders interact and how power and trust influences the facilitation role of leadership is also useful in gauging how an ERP can be most effectively deployed.

Satellite dialysis nursing : technology, caring and power

Aim. This paper is a report of an exploration of nurses’ perceptions of the quality of satellite dialysis care and how aspects of power that influenced quality nursing care.

Background. In Australia, the majority of people living with established kidney failure undertake haemodialysis in nurse-run satellite dialysis units. Haemodialysis nurses provide the majority of care, and their perceptions of what constitutes quality nursing care may influence their care of the person receiving haemodialysis.

Method. A critical ethnographic study was conducted where data were collected from one metropolitan satellite dialysis unit in Australia over a 12-month period throughout 2005. The methods included non-participant observation, interviews, document analysis, reflective field notes and participant feedback.

Findings. Three theoretical constructs were identified: ‘What is quality?’, ‘What is not quality?’ and What influences quality?’ Nurses considered technical knowledge, technical skills and personal respect as characteristics of quality. Long-term blood pressure management and arranging transport for people receiving dialysis treatment were not seen to be priorities for quality care. The person receiving dialysis treatment, management, nurse and environment were considered major factors determining quality dialysis nursing care.

Conclusion. Aspects of power and oppression operated for nurses and people receiving dialysis treatment within the satellite dialysis context, and this environment was perceived by the nurses as very different from hospital dialysis units.

Power relations in IS projects – a critical review and a new research agenda

This paper seeks to review and examine the major theoretical underpinnings of research into power relations in IS projects. In order to keep the review manageable and to furnish a reasonable explanation of the ideas and papers referenced, the review is restricted to the ideas of Foucault, Giddens and Clegg. Partly, this restriction was due to the wish of the authors to deal seriously with the ideas presented, and not to produce an exhaustive but terse and taxonomic style review. Partly, the selection of the above theorists is due to the fact that the major IS papers on power relations have drawn on their work. This paper concludes with the presentation of a new theory of power and social influence from social psychology suitable for use in IS research. The ideas of this theory have not yet been examined empirically. Thus, IS researchers are challenged to employ these ideas in their empirical research.

Size and power properties of structural break unit root tests

In this article, we compare the small sample size and power properties of a newly developed endogenous structural break unit root test of Narayan and Popp (NP, 2010) with the existing two break unit root tests, namely the Lumsdaine and Papell (LP, 1997) and the Lee and Strazicich (LS, 2003) tests. In contrast to the widely used LP and LS tests, the NP test chooses the break date by maximizing the significance of the break dummy coefficient. Using Monte Carlo simulations, we show that the NP test has better size and high power, and identifies the structural breaks accurately. Power and size comparisons of the NP test with the LP and LS tests reveal that the NP test is significantly superior.

Ritual power : illuminating the blind spot of births, deaths and marriages in news media research

This article conceptualises the role and place of the newspaper births, deaths and marriages column in Western societies and its relationship to news media. It identifies the births, deaths and marriages notices as a ‘blind spot’ within journalism and media research generated by powerful cultural norms and conventions shaping the field. This is exemplified by the ‘mythical’ divide between political economy and culturalist approaches to media studies that has created a gap where people’s everyday practices or the social value of ‘commercial’ content tends to be overlooked in discussions about news media. Drawing more deeply from cultural studies and scholarship around media power and rituals, the births, deaths and marriages column provides a compelling unique illustration of the ways newspapers – especially at the local level – continue to be perceived as central to the social in this changing media world. A qualitative research project into the future of small commercial newspapers in Australia provides rich data for exploring these key ideas.

Optimal power allocation and load distribution for multiple heterogeneous multicore server processors across clouds and data centers

For multiple heterogeneous multicore server processors across clouds and data centers, the aggregated performance of the cloud of clouds can be optimized by load distribution and balancing. Energy efficiency is one of the most important issues for large-scale server systems in current and future data centers. The multicore processor technology provides new levels of performance and energy efficiency. The present paper aims to develop power and performance constrained load distribution methods for cloud computing in current and future large-scale data centers. In particular, we address the problem of optimal power allocation and load distribution for multiple heterogeneous multicore server processors across clouds and data centers. Our strategy is to formulate optimal power allocation and load distribution for multiple servers in a cloud of clouds as optimization problems, i.e., power constrained performance optimization and performance constrained power optimization. Our research problems in large-scale data centers are well-defined multivariable optimization problems, which explore the power-performance tradeoff by fixing one factor and minimizing the other, from the perspective of optimal load distribution. It is clear that such power and performance optimization is important for a cloud computing provider to efficiently utilize all the available resources. We model a multicore server processor as a queuing system with multiple servers. Our optimization problems are solved for two different models of core speed, where one model assumes that a core runs at zero speed when it is idle, and the other model assumes that a core runs at a constant speed. Our results in this paper provide new theoretical insights into power management and performance optimization in data centers.

Volume, intensity, and timing of muscle power potentiation are variable

Whereas muscle potentiation is consistently demonstrated with evoked contractile properties, the potentiation of functional and physiological measures is inconsistent. The objective was to compare a variety of conditioning stimuli volumes and intensities over a 15-min recovery period. Twelve volleyball players were subjected to conditioning stimuli that included 10 repetitions of half squats with 70% of 1-repetition maximum (RM) (10 × 70), 5 × 70, 5 × 85, 3 × 85, 3 × 90, 1 × 90, and control. Jump height, power, velocity, and force were measured at baseline, 1, 3, 5, 10, and 15 min. Data were analysed with a 2-way repeated measure ANOVA and magnitude-based inferences. The ANOVA indicated significant decreases in jump height, power, and velocity during recovery. This should not be interpreted that no potentiation occurred. Each dependent variable reached a peak at a slightly different time: peak jump height (2.8 ± 2.3 min), mean power (3.6 ± 3.01 min), peak power (2.5 ± 1.8 min), and peak velocity (2.5 ± 1.8 min). Magnitude-based inference revealed that both the 5 × 70 and 3 × 85 protocol elicited changes that exceeded 75% likelihood of exceeding the smallest worthwhile change (SWC) for peak power and velocity. The 10 × 70 and the 5 × 70 had a substantial likelihood of potentiating peak velocity and mean power above the SWC, respectively. Magnitude-based inferences revealed that while no protocol had a substantial likelihood of potentiating the peak vertical jump, the 5 × 70 had the most consistent substantial likelihood of increasing the peak of most dependent variables. We were unable to consistently predict if these peaks occurred at 1, 3, or 5 min poststimulation, though declines after 5 min seems probable.

Impacts of integration of wind and solar PV in a typical power network

Integration of solar PV and wind in to the distribution network is one of the most promising challenges of the modern power system networks to meet the growing demand of energy. Analysis of the effects of solar and wind intermittencies in the network are vital to maintain the power quality. Keeping this in view, this research paper focuses on impact analysis study of a typical power network with hybrid generation: solar PV and wind integration to quantify the level of impacts like power variation and voltage variation in the network through load flow analysis. Initially, a typical network model is developed using PSS-SINCAL and load profile analysis has been carried out based on the typical daily load profile and wind/solar profile to verify the power and voltage variations extensively in the network considering different scenarios. Results of this research analysis can be used as guidelines for utility grid to provide regulated and improved quality of energy supply by implementing appropriate planning of generation reserve and other control measures in the network

Rethinking news media and local government: journalism, politics and symbolic power

This essay explores why the relationship between news media and local government has been of little interest in journalism studies, especially in the Australian context. We argue that the reasons are complex but can be traced to issues of symbolic recognition and legitimacy. An overview of local government and news media in Australia and Aotearoa/New Zealand grounds the discussion in journalism and democratic theory. We draw on Bourdieu’s tradition of field-based research and theories of media power to highlight the important role 19th-century newspapers played in the establishment of municipalities. We then argue that local government’s omission from the Australian Constitution relates to issues of legitimacy and recognition that are reflected in the wider field of power and perpetuated within journalism practice and scholarship. Finally, practitioner perspectives and contemporary research underline the need for critical engagement and inquiry that recognise the fundamental importance of news and politics closest to the people.

Shifting foundations: journalism and the power of the 'common good'

This essay rethinks the relationship between news media and the universal notion of the ‘common good’ as a key foundational concept for journalism studies. It challenges dominant liberal democratic theories of the press linked to the idea of the ‘public good’ to offer a new way of conceptualizing news media’s relationship to civic life that incorporates power and legitimacy in the changing media world. In doing so, it argues current understandings of journalism’s relationship to the common good also require some re-alignment. The essay draws on Pierre Bourdieu to contend the common good can be understood as a global doxa – an unquestionable orthodoxy that operates as if it were objective truth – across wider social space. How this is carried out in practice depends on the specific context in which it is understood. It positions the common good in relation to news media’s symbolic power to construct reality and argues certain elites generate and reinforce their legitimacy by being perceived as central to negotiating understandings of the common good with links to culture, community and shared values.