1,721,300 research outputs found
Changing nature of competition in the weak party system of hybrid regime in Pakistan
Full text linkPakistan as different post-colonial states had experienced three military rules till 2008 since its inception in 1947. During and in between different military rule political parties did not cease to exist barring few. These parties have been engaged in a contentious competition among each other that has paved the way for different military rules. After the end of last military rule in 2008 Pakistan had gone through three consecutive elections with three different parties gaining majority. During this period the nature of competition has been oscillating between contentious and cooperative forms. This dissertation combines the theoretical traditions of hybrid regimes and party-system institutionalization to explain the changing political dynamics of Pakistan. Case of Pakistan is analyzed with reference to configurative approach of Gilbert and Mohseni (2011) in linkage with the concept of party-system institutionalization (PSI), proposed by Mainwaring and Scully (1995). It is proposed that in the presence of current degree of PSI in Pakistan, hybridity of the regime will persist
Open Circuit and Current Sensor Fault Diagnosis, Localization and Compensation of DC Converters and AC Machines Drives
No full textThis thesis consolidates innovative methodologies in fault diagnosis and fault-tolerant control within renewable energy systems, focusing particularly on interleaved DC-DC converters and AC motor drive systems. Given the critical nature of maintaining system integrity and optimizing operations in renewable energy applications, this research introduces three distinct methodologies to advance fault diagnosis capabilities.
The first study proposes an open-switch fault diagnosis and current sensor fault-tolerant control for a DC-DC interleaved boost converter using a \gls{gpio}. This method designs an observer model to estimate and compensate for current sensor faults within the closed-loop control, allowing for effective fault diagnosis under faulty current measurements. The robustness and effectiveness of this approach are validated through simulation and experimental results, demonstrating its capability to maintain operation even with the faulted current sensors.
The second approach investigates the challenges due to model mismatch, external disturbances, and load fluctuations in traditional \gls{mpc} systems. It introduces a state observer-based \gls{mfpc} technique, employing two types of state observers: a \gls{pio} and a proposed \gls{smo}. This approach enhances the robustness and dynamic performance of a three-stage DC-DC converter by effectively rejecting model disturbances and assessing control resilience under adverse conditions. Simulation studies confirm the superior performance and resilience of the MFPC over conventional MPC methods.
The third study delves into motor drive systems, where it develops a novel methodology to promptly diagnose and localize semiconductor open switch faults. Utilizing a signal-based approach, this study introduces a power-based diagnostic algorithm to identify and localize different types of open-switch faults in power converters driving synchronous reluctance motor drives. The fault detection process is remarkably swift, diagnosing faults in less than , which corresponds to of the motor’s current fundamental period. Simulations and experiments validate the technique’s efficacy in enhancing the reliability of motor drive systems.
These findings provide substantial advancements in fault diagnosis techniques for renewable energy systems, emphasizing the integration of innovative observer models and diagnostic algorithms to enhance the fault tolerance and reliability of power converters and motor drives
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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