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Articles 361 - 371 of 371
Full-Text Articles in Science and Technology Studies
A Parallel Evolutionary Strategy For The Large-Scale Dynamic Optimal Reactive Power Flow, Chixin Xiao, Danny Sutanto, Kashem M. Muttaqi, Minjie Zhang
A Parallel Evolutionary Strategy For The Large-Scale Dynamic Optimal Reactive Power Flow, Chixin Xiao, Danny Sutanto, Kashem M. Muttaqi, Minjie Zhang
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 IEEE. This paper proposes a parallel evolutionary strategy to solve a large-scale dynamic optimal reactive power flow (ORPF) problem to minimize the transmission losses while ensuring that the power system constraints are met, by varying the voltage magnitude of generators, the transformer taps and all reactive power support, installed in the power system. The existing heuristic algorithms are time-consuming due to the large number of sequential calculations that need to be carried out. This paper proposes the use of a parallel evolutionary strategy to speed up the optimization of a large-scale ORPF problem based on the orthogonal design …
Dosimetric Optimization And Commissioning Of A High Field Inline Mri-Linac, Urszula Jelen, Bin Dong, Jarrad Begg, Natalia Roberts, Brendan Whelan, Paul Keall, Gary P. Liney
Dosimetric Optimization And Commissioning Of A High Field Inline Mri-Linac, Urszula Jelen, Bin Dong, Jarrad Begg, Natalia Roberts, Brendan Whelan, Paul Keall, Gary P. Liney
Faculty of Engineering and Information Sciences - Papers: Part B
© Copyright © 2020 Jelen, Dong, Begg, Roberts, Whelan, Keall and Liney. Purpose: Unique characteristics of MRI-linac systems and mutual interactions between their components pose specific challenges for their commissioning and quality assurance. The Australian MRI-linac is a prototype system which explores the inline orientation, with radiation beam parallel to the main magnetic field. The aim of this work was to commission the radiation-related aspects of this system for its application in clinical treatments. Methods: Physical alignment of the radiation beam to the magnetic field was fine-tuned and magnetic shielding of the radiation head was designed to achieve optimal beam …
Size Distribution Measurement Of Coal Fragments Using Digital Imaging Processing, Xiaohan Yang, Ting X. Ren, Lihai Tan
Size Distribution Measurement Of Coal Fragments Using Digital Imaging Processing, Xiaohan Yang, Ting X. Ren, Lihai Tan
Faculty of Engineering and Information Sciences - Papers: Part B
This paper focuses on the size distribution measurement of coal fragments by digital imaging processing. The fast and precise measurement of coal fragments, which is important to understand the crack propagation and energy dissipation process of coal failure, has not been achieved by previous research. In this paper, an image analysis method using MATLAB is proposed to measure fragment size distribution of coal fragments. The acquisition setup, analysis step and coding process for fragment size distribution measurement by digital imaging processing are introduced in detail. The statistical size distribution of coal fragments measured by image processing is compared with the …
The Structural, Electronic, And Optical Properties Of Ge/Si Quantum Wells: Lasing At A Wavelength Of 1550 Nm, Hongqiang Li, Jianing Wang, Jinjun Bai, Shanshan Zhang, Sai Zhang, Yaqiang Sun, Qianzhi Dou, Mingjun Ding, Youxi Wang, Dan Qu, Jilin Du, Chunxiao Tang, Enbang Li, Joan Prades
The Structural, Electronic, And Optical Properties Of Ge/Si Quantum Wells: Lasing At A Wavelength Of 1550 Nm, Hongqiang Li, Jianing Wang, Jinjun Bai, Shanshan Zhang, Sai Zhang, Yaqiang Sun, Qianzhi Dou, Mingjun Ding, Youxi Wang, Dan Qu, Jilin Du, Chunxiao Tang, Enbang Li, Joan Prades
Faculty of Engineering and Information Sciences - Papers: Part B
The realization of a fully integrated group IV electrically driven laser at room temperature is an essential issue to be solved. We introduced a novel group IV side-emitting laser at a wavelength of 1550 nm based on a 3-layer Ge/Si quantum well (QW). By designing this scheme, we showed that the structural, electronic, and optical properties are excited for lasing at 1550 nm. The preliminary results show that the device can produce a good light spot shape convenient for direct coupling with the waveguide and single-mode light emission. The laser luminous power can reach up to 2.32 mW at a …
Optimization Of Maintenances Following Proof Tests For The Final Element Of A Safety-Instrumented System, Aibo Zhang, Tieling Zhang, Anne Barros, Yiliu Liu
Optimization Of Maintenances Following Proof Tests For The Final Element Of A Safety-Instrumented System, Aibo Zhang, Tieling Zhang, Anne Barros, Yiliu Liu
Faculty of Engineering and Information Sciences - Papers: Part B
2019 The Authors Safety-instrumented systems (SISs) have been widely installed to prevent accidental events and mitigate their consequences. Mechanical final elements of SISs often become vulnerable with time due to degradations, but the particulars in SIS operations and assessment impede the adaption of state-of-art research results on maintenances into this domain. This paper models the degradation of SIS final element as a stochastic process. Based on the observed information during a proof test, it is essential to determine an optimal maintenance strategy by choosing a preventive maintenance (PM) or corrective maintenance (CM), as well deciding what degree of mitigation of …
Performance Of Ballast Influenced By Deformation And Degradation: Laboratory Testing And Numerical Modeling, Buddhima Indraratna, Ngoc Trung Ngo, Cholachat Rujikiatkamjorn
Performance Of Ballast Influenced By Deformation And Degradation: Laboratory Testing And Numerical Modeling, Buddhima Indraratna, Ngoc Trung Ngo, Cholachat Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part B
This paper presents a study on the deformation and degradation responses of railway ballast using large-scale laboratory testing and computational modeling approaches. A series of large-scale triaxial tests were carried out to investigate the ballast breakage responses under cyclic train loading subjected to varying frequencies, f=10-40 Hz. The role of recycled rubber energy-absorbing mats (REAMs) on reducing ballast breakage was also examined. Laboratory test results show that the ballast experiences significant degradation (breakage) and deformation, while the inclusion of REAMs can reduce the ballast breakage up to about 35%. Numerical modeling using the coupled discrete-continuum approach [coupled discrete-element method-finite-difference method …
How Misinformation Spreads Through Twitter, Mary Blankenship
How Misinformation Spreads Through Twitter, Mary Blankenship
Student Research
While living in the age of information, an inherent drawback to such high exposure to content lends itself to the precarious rise of misinformation. Whether it is called “alternative facts,” “fake news,” or just incorrect information, because of its pervasiveness in nearly every political and policy discussion, the spread of misinformation is seen as one of the greatest challenges to overcome in the 21st century. As new technologies emerge, a major piece of both content creation and the perpetuation of misinformation are social media platforms like Twitter, Facebook, and YouTube. As news events emerge, whether be a pandemic, a mass …
Iran, Diane M. Zorri
Iran, Diane M. Zorri
Publications
Internet access in Iran is characterized by strong censorship, limited access, surveillance, and widespread state-sanctioned propaganda. The regime in Tehran views internet freedom as a critical threat to its national security (Henry, Pettyjohn, and York 2014). Using an index of variables such as obstacles to access, limits on content, and violations of user rights, the nongovernmental organization Freedom House rates Iran’s internet access as “not free” (Freedom House 2018). On a scale of zero to one hundred, where zero is “free” and one hundred is “not free,” Freedom House scores Iran at an eighty-five, making it the least free nation …
Data Governance And The Emerging University, Michael J. Madison
Data Governance And The Emerging University, Michael J. Madison
Book Chapters
Knowledge and information governance questions are tractable primarily in institutional terms, rather than in terms of abstractions such as knowledge itself or individual or social interests. This chapter offers the modern research university as an example. Practices of data-intensive research by university-based researchers, sometimes reduced to the popular phrase “Big Data,” pose governance challenges for the university. The chapter situates those challenges in the traditional understanding of the university as an institution for understanding forms and flows of knowledge. At a broad level, the chapter argues that the new salience of data exposes emerging shifts in the social, cultural, and …
Tools For Data Governance, Michael J. Madison
Tools For Data Governance, Michael J. Madison
Articles
This article describes the challenges of data governance in terms of the broader framework of knowledge commons governance, an institutional approach to governing shared knowledge, information, and data resources. Knowledge commons governance highlights the potential for effective community- and collective-based governance of knowledge resources. The article focuses on key concepts within the knowledge commons framework rather than on specific law and public policy questions, directing the attention of researchers and policymakers to critical inquiry regarding relevant social groups and relevant data “things.” Both concepts are key tools for effective data governance.
The Future Of Law Schools: Covid-19, Technology, And Social Justice, Christian Sundquist
The Future Of Law Schools: Covid-19, Technology, And Social Justice, Christian Sundquist
Articles
The COVID-19 pandemic has laid bare not only the social and racial inequities in society, but also the pedagogical and access to justice inequities embedded in the traditional legal curriculum. The need to re-envision the future of legal education existed well before the current pandemic, spurred by the shifting nature of legal practice as well as demographic and technological change. This article examines the impact of the COVID-19 pandemic on legal education, and posits that the combined forces of the pandemic, social justice awareness and technological disruption will forever transform the future of both legal education and practice.