Modelling and power quality analysis of a grid-connected solar PV system

Increased concern about global warming coupled with the escalating demand of energy has driven the conventional power system to be more reliable one by integrating Renewable Energies (RE) in to grid. Over the recent years, integration of solar PV forming a gridconnected PV is considered as one of the most promisingtechnologies to the developed countries like Australia to meet the growing demand of energy. This rapid increase in grid connected photovoltaic (PV) systems has made the supply utilities concerned about the drastic effects that have to be considered on the distribution network in particular voltage fluctuations, harmonic distortions and the Power factor for sustainable power generation. However, irrespective of thefact that the utility grid can accommodate the variability of load or irregular solar irradiance, it is essential to study the impact of grid connected PV systems during higher penetration levels as the intermittent nature of solar PV adversely effects the grid characteristics in meeting the load demand. Hence, keeping this in track, this paper examines the grid-connected PV system considering a residential network of Geelong region (38◦.09' S and 144◦.21’ E) and explores the level of impacts considering summer load profile with a change in the level of integrations. Initially, a PV power system network model is developed in Matlab-Simulink environment and the simulations are carried out to explore the impacts of solar PV penetration at low voltage distribution network considering power quality (PQ) issues such as voltage fluctuations, harmonics distortion at different load conditions.

Facilitated communication and authorship: a systematic review

Facilitated Communication (FC) is a technique whereby individuals with disabilities and communication impairments allegedly select letters by typing on a keyboard while receiving physical support, emotional encouragement, and other communication supports from facilitators. The validity of FC stands or falls on the question of who is authoring the typed messages--the individual with a disability or the facilitator. The International Society for Augmentative and Alternative Communication (ISAAC) formed an Ad Hoc Committee on FC and charged this committee to synthesize the evidence base related to this question in order to develop a position statement. The purpose of this paper is to report this synthesis of the extant peer-reviewed literature on the question of authorship in FC. A multi-faceted search was conducted including electronic database searches, ancestry searches, and contacting selected authors. The authors considered synopses of systematic reviews, and systematic reviews, which were supplemented with individual studies not included in any prior reviews. Additionally, documents submitted by the membership were screened for inclusion. The evidence was classified into articles that provided (a) quantitative experimental data related to the authorship of messages, (b) quantitative descriptive data on the output generated through FC without testing of authorship, (c) qualitative descriptive data on the output generated via FC without testing of authorship, and (d) anecdotal reports in which writers shared their perspectives on FC. Only documents with quantitative experimental data were analyzed for authorship. Results indicated unequivocal evidence for facilitator control: messages generated through FC are authored by the facilitators rather than the individuals with disabilities. Hence, FC is a technique that has no validity.

The effects of circadian rhythmicity of salivary cortisol and testosterone on maximal isometric force, maximal dynamic force, and power output

The study investigated the effects of circadian rhythm of cortisol (C) and testosterone (T) on maximal force production (Fpeak) and power output (Ppeak). Twenty male university students (mean age = 23.8 ± 3.6 years, height = 177.5 ± 6.4 cm, weight = 78.9 ± 11.2 kg) performed 4 time-of-day testing sessions consisting of countermovement jumps (CMJs), squat jumps (SJ), isometric midthigh pulls (IMTPs), and a 1-repetition maximum (1RM) squat. Saliva samples were collected at 0800, 1200, 1600, and 2000 hours to assess T and C levels on each testing day. Session rate-of-perceived exertion (RPE) scores were collected after each session. The results showed that Fpeak and Ppeak presented a clear circadian rhythm in CMJ and IMTP but not in SJ. One repetition maximum squat did not display a clear circadian rhythm. Session RPE scores collected at 0800 and 2000 hours were significantly (p ≤ 0.05) higher than those obtained at 1200 and 1600 hours. Salivary T and C displayed a clear circadian rhythm with highest values at 0800 hours and lowest at 2000 hours; however, no significant correlation was found between T and C with Fpeak and Ppeak. A very strong correlation was found between Taural with Fpeak of CMJ and IMTP and Ppeak of CMJ (r = 0.86, r = 0.84 and r = 0.8, p ≤ 0.001). The study showed the existence of a circadian rhythm in Fpeak and Ppeak in CMJ and IMTP. The evidence suggests that strength and power training or testing should be scheduled later during the day. The use of Taural seemed to be a more effective indicator of physical performance than hormonal measures, and the use of session RPE should also be closely monitored because it may present a circadian rhythm.

Sport and sex: rogue players, predatory women and power

Why do sportspeople feature regularly in reports of sexual shenenigans? Social scientists explain.

Families and caregivers of older people: expectations, communication and care decisions

While family caregivers may temporarily relinquish responsibility for daily care to health professionals for the period of hospitalization, new expectations and demands are placed upon them. Family caregivers can be asked to commit to new relationships with health professionals, contribute to care decisions and discharge planning. For the caregivers of older patients these new expectations may be challenging, and contribute to feelings of burden and increased stress. The aim of this qualitative descriptive study was to explore the experience of family caregivers when their relative is an inpatient in this outer Melbourne geriatric evaluation and management facility. This study found that the burden associated with the experience of caregiving continued despite the hospitalization of their relative. The challenges faced by families included communicating with health professionals, and being asked to contribute to care decisions, in particular those regarding discharge planning, and managing conflict. In conclusion, the issues and challenges faced by family caregivers needs to be acknowledged and considered as an extension of patient care planning

The effect of continuous repetition training and intra-set rest training on bench press strength and power

Lawton et al compare the effects of continuous repetition and intra-set rest training on maximal strength and power output of the upper body. Results show that bench press training involving 4 sets of 6 continuous repetitions elicited a greater improvement in bench press strength than 8 sets of 3 repetitions at the same percentage load of their 6 repetition maximum.

Mean girls, homosociality and football: an education on social and power dynamics between girls and women

Relationships between girls and women have typically been explored through the lexicon of ‘friendship’ or, where there is a presence of sexual desire, ‘lesbian’. This article suggests the complexity and impact of female (same-sex) sociality, and its relationship to heteronormativity and power dynamics between girls and women runs deeper than the terms ‘friendship’ or ‘lesbian’ give rise to. Exploring social and power dynamics amongst girls and women, this article explores how gender is policed and negotiated within a framework of homosociality. Drawing on empirical research within a women's Australian Rules football team, I explore the complexity of female same-sex bonds, the negotiation of gender embodiment and performance within female homosocial spaces, and the emergence of women's own lexicons in making sense of their relationships with other women in this particular social sphere, further considering how this might be applied to other female homosocial spaces, including same-sex educational and sporting sites.

Deaf education and underlying structures of power in communication

This article argues that claims of diversity in communication in deaf education are empty rhetoric when underlying structures of power are unexamined and remain unchanged. The field of deafness provides a powerful example of the way in which competing interests can be played out under the guise of choice of communication methods. Historically, teachers of the deaf have been divided about whether deaf children should be educated through speech or sign. However, recognition of the legitimacy of native sign languages has caused a shift in the debate to the linguistic basis of this communication and the way in which language policy privileges one cultural group and its method of communication over another.

People, power and public relations

Public relations is conventionally viewed from a corporate perspective. However, recent events in Victoria have illustrated the fact that grassroots activism holds an increasing share of public relations expertise. In contemporary Victoria civil activism has advanced a long way from traditional adversarial NIMBY (Not In My Back Yard) campaigns and has succeeded in generating both social and cultural change. How does a civil activist approach the complex problem of public relations? How do they convince publics their arguments are in the interest of the whole community? Is it is a question of mimicking corporate techniques or has a new style of public relations evolved specific to their needs? This paper examines a case study in which an outer- suburban grassroots activist group effected significant change in state government and corporate policy. The results challenge the view that public relations is the exclusive tool of large corporations and governments and calls for a redefinition of ‘what is public relations’?

Aboriginal women and reconciliation in Australia : communication strategies and symbolism

This thesis explores the voices of Aboriginal women in the Reconciliation movement from 1991to 2001. It charts their success and failure, the power of the media and Reconciliation symbolism. Some of these women leaders retain a passionate commitment to Reconciliation while others have totally withdrawn from the process.

Abuse of power, oppression and the struggle for human rights in modern indonesian short fiction

 Across the 1990s, Indonesian writers used the short story genre to represent human rights abuses in Indonesia.These rights included freedom of speech, right to life and right to assembly. The short story had great impact, depicting dramatically both perpetrators and victims, and exposing the social, economic and political conditions which bred such abuses.