Applying series braking resistors to improve the stability of low inertia synchronous generators

Widely held concerns over the environmental impact of emissions from large fossil fuelled generating plants are serving to promote the connection of renewable or sustainable generation onto distribution networks. Many such generators are synchronous machines with low values of inertia, and thus possess short critical clearance times to avoid the onset of transient instability. With fault clearance times of up to 1s occurring in distribution networks, there is the potential for a growing problem as distributed generation makes up a larger proportion of installed capacity. This paper proposes the use of series braking resistors that are switched into circuit at the generator terminals as a means of improving transient stability, and thus avoid, or at least defer major upgrades to distribution system protectio

A Role for Intraflagellar Transport Proteins in Mitosis: A Dissertation

Disruption of cilia proteins results in a range of disorders called ciliopathies. However, the mechanism by which cilia dysfunction contributes to disease is not well understood. Intraflagellar transport (IFT) proteins are required for ciliogenesis. They carry ciliary cargo along the microtubule axoneme while riding microtubule motors. Interestingly, IFT proteins localize to spindle poles in non-ciliated, mitotic cells, suggesting a mitotic function for IFT proteins. Based on their role in cilia, we hypothesized that IFT proteins regulate microtubule-based transport during mitotic spindle assembly. Biochemical investigation revealed that in mitotic cells IFT88, IFT57, IFT52, and IFT20 interact with dynein1, a microtubule motor required for spindle pole maturation. Furthermore, IFT88 co-localizes with dynein1 and its mitotic cargo during spindle assembly, suggesting a role for IFT88 in regulating dynein-mediated transport to spindle poles. Based on these results we analyzed spindle poles after IFT protein depletion and found that IFT88 depletion disrupted EB1, γ-tubulin, and astral microtubule arrays at spindle poles. Unlike IFT88, depletion of IFT57, IFT52, or IFT20 did not disrupt spindle poles. Strikingly, the simultaneous depletion of IFT88 and IFT20 rescued the spindle pole disruption caused by IFT88 depletion alone, suggesting a model in which IFT88 negatively regulates IFT20, and IFT20 negatively regulates microtubulebased transport during mitosis. Our work demonstrates for the first time that IFT proteins function with dynein1 in mitosis, and it also raises the important possibility that mitotic defects caused by IFT protein disruption could contribute to the phenotypes associated with ciliopathies

The education and training of accounting technicians in the Sultanate of Oman : The accounting diploma program at Sultan Qaboos University

The discovery and subsequent commercial exploitation of oil in the Arabian Gulf region has brought profound and far-reaching change to the peoples of the area. What has happened has been nothing short of a transformation from desert sheikdoms into modem nation states;The Sultanate of Oman is one of those states. Although Oman is not a major oil producer in world terms, it has been able to use its oil revenues over the past three decades to finance the establishment of a modem infrastructure and to develop its social and economic systems. Notwithstanding the success of Oman\u27s national development efforts thus far, significant challenges lie ahead

Towards a Common Center: Locating Common Characteristics of African Centeredness in an Independent African Centered Learning Environment

As a culturally relevant alternative to traditional public school environments, Independent African Centered schools feature a particular type of culturally relevant pedagogy. This study explored the teachers’ and administrator’s perceptions and applications of African Centered pedagogy in an African Centered school. Interviews, observations and a document review served as the source of data for this study. This basic interpretive study utilized a qualitative research design to explore the perceptions and application of African Centeredness among the participants. An analysis of the data revealed categories and themes related to the school’s mission and the participants’ perceptions and performance of African-centered pedagogy. Three general conclusions were drawn from the findings. Implications for theory, study limitations and recommendations for future research are provided

Soul In A Can : Exploring How Black Male Students And Artists Navigate The Constraints Of Urban Classrooms And The Music Industry

ABSTRACT “Soul in a Can” builds on research that explores Black male identity and containment within structures where racial power is distributed inequitably. This research responds to a need for more diversity regarding the range of Black male voices explored in academic literature. This arts-based qualitative research used a case study design to explore how Black male students and artists navigate the constraints of urban classrooms and the music industry. The following questions guided this exploration: How do contemporary professional Black male recording artists navigate the recording industry’s tendency to restrain their personal “voice” and creative agency in the process of commodifying their talents? How do Black male youth navigate classroom spaces to maintain their personal “voice” and creative agency? Are there similarities between the experiences of Black male artists and Black males in the education system and how they navigate the power differential they face? Data is comprised of participant interviews with six Black males including three students and three professional recording artists. Interviews were conducted in a two-phase process that respectively focused on participant rendered key metaphorsand sound worlds.More specifically, the researcher employed a Critical Race Theory frame emphasizing two of its components— “whiteness as property” and “interest convergence”—along with an Arts-Based Methodology which employed a fugue of elements in order to creatively collect and analyze data. Significantly the study chronicles and offers insight into the Black experience and resistance in two sites—the music industry and classrooms—as lived by Black male artists and students. Notably, these two sites have not been adequately examined in relation to one another. Findings reveal that participants across sites navigated inequitable power through a four-phase process— “I’ll figure it out,” “Peep Game,” “New Attitude,” and “Experience is the best teacher”—in which experiential knowledge was refined and sharpened; this enabled participants to successfully survive endemic racism, but questions remain regarding what the author terms dysconscious acquiescenceor the apparent belief that “surviving” is a substitute for “thriving.” Implications abound regarding the impact of structural containment on Black identity development, cultural authenticity, and expression

Performance evaluation of two degree of freedom conventional controller adopting the smith principle for first order process with dead time

The Proportional Integral Derivative Controller is a typical controller implemented frequently in many services and integrating the Smith predictor is an extremely useful control system structure for processes with dead time. This paper has evaluated two control schemes with the modified structures of the Smith predictor incorporating dead time compensators and conventional controllers for first order process with dead time. The disturbance response and the set point response for both the control schemes were decoupled from each other. Therefore two degrees of freedom control design was formulated, and hence the responses could be designed separately. The two control schemes have mainly two variables to be adjusted that decide the robustness and closed-loop behaviour. This paper also contains the calculation of various parameters that were used in each scheme. A comparison of the two control schemes along with the general Smith predictor control scheme was made using Simulink/Matlab. The conclusion is the second control scheme gave better response overall for the processes with dead time having dead time uncertainty and for the processes with dead time without dead time uncertainty

Caribbean Chronicle

A trip to Jamaica and Cuba offers Furman faculty an absorbing look at the sights, sounds and societal changes in two of the most exotic locales in the Western Hemisphere

Discourse and identity in a corpus of lesbian erotica

This article uses corpus linguistic methodologies to explore representations of lesbian desires and identities in a corpus of lesbian erotica from the 1980s and 1990s. We provide a critical examination of the ways in which “lesbian gender,” power, and desire are represented, (re-)produced, and enacted, often in ways that challenge hegemonic discourses of gender and sexuality. By examining word frequencies and collocations, we critically analyze some of the themes, processes, and patterns of representation in the texts. Although rooted in linguistics, we hope this article provides an accessible, interdisciplinary, and timely contribution toward developing understandings of discursive practices surrounding gender and sexuality