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123rd ASEE Annual Conference and Exposition

作者： Allendoerfer, Cheryl Wilson, Denise Plett, Melani Bates, Rebecca A. Smith, Tamara Floyd Veilleux, Nanette M. University of Washington College of Engineering United States University of Washington Department of Electrical Engineering Seattle United States Seattle Pacific University United States Minnesota State University Department of Integrated Engineering Program Mankato United States Tuskegee University Department of Chemical Engineering United States Simmons College Computer Science and Informatics Program BostonMA United States

In the context of Tinto's Model of Institutional Departure, faculty support is critical to academic integration, which in turn is an essential element of persistence in college. Thus, understanding students' perceptions of faculty support in varied settings can provide insight into student satisfaction, performance, and persistence in engineering programs. In this study, focus groups were conducted with 175 students from five different institutions and a variety of engineering and computer science majors. The institutions in this study included a small women's college, a historically black university, a small private university, a medium size teaching university, and a large public research university. Focus group transcripts were coded and analyzed qualitatively. Findings from this analysis show that in some settings, despite a perceived lack of formal, in-class faculty support, students are still able to find faculty support outside the classroom, while in other settings this informal support is also perceived as lacking. In general, smaller environments with smaller student-to-faculty ratios appear to support stronger perceptions of support, although through different pathways. A small class size does not guarantee that students will perceive greater faculty support in that class. Large class sizes are not automatically detrimental for students, but they can be if students in those classes feel a lack of faculty support or availability both in and out of the classroom. With regard to institution type, the notion that undergraduates perceive lower levels of faculty support at research institutions holds true. This study has not verified whether the level of faculty support is actually less at research institutions, but only that students' self-reported perceptions of that support were lower at the research-focused institution when compared to teaching-focused institutions in this study. Regardless, given the importance of faculty support in persistence and other a

关键词： Class size engineering Faculty support Faculty-student interactions Institution type

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Multi-criteria optimisation design of shapers with piece-wise equally distributed time-delay

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IFAC-PapersOnLine 2016年第10期49卷 112-117页

作者： Pilbauer, Dan Michiels, Wim Vyhlidal, Tomas CIIRC - Czech Institute of Informatics Robotics and Cybernetics and Dept. of Instrumentation and Control Eng. Faculty of Mechanical Engineering Czech Technical University in Prague Technická 4 166 07 Praha 6 Czech Republic Department of Computer Science Katholieke Universiteit Leuven Celestijnenlaan 200A HeverleeB-3001 Belgium

The paper presents an optimisation based method to parametrize input shapers with time delays of piece-wise-equal distribution. The design respects the two key requirements on the shaper performance that are the prompt response time and the robustness represented by residual vibration functions, which are however conflicting criteria as a rule. Thus, the optimisation task is solved as a constrained multi-objective problem where the constraints respect the additional requirements on the shaper performance such as a non-decreasing step response or zero residual function at some frequency points. The result is a Pareto front that shows a trade-off between the two main requirements. Next to the presentation of the results in an example, a user friendly shaper-design tool is presented. © 2016

关键词： Multiobjective optimization computer control systems Constrained optimization Economic and social effects Time delay Timing circuits Distributed time delays Multi criteria optimisation Multi objective problem Pareto frontiers Residual functions Residual vibrations Signal shaper Vibration suppression

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A repeating fast radio burst source localised to a nearby spiral galaxy

arXiv

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arXiv 2020年

作者： Marcote, B. Nimmo, K. Hessels, J.W.T. Tendulkar, S.P. Bassa, C.G. Paragi, Z. Keimpema, A. Bhardwaj, M. Karuppusamy, R. Kaspi, V.M. Law, C.J. Michilli, D. Aggarwal, K. Andersen, B. Archibald, A.M. Bandura, K. Bower, G.C. Boyle, P.J. Brar, C. Burke-Spolaor, S. Butler, B.J. Cassanelli, T. Chawla, P. Demorest, P. Dobbs, M. Fonseca, E. Giri, U. Good, D.C. Gourdji, K. Josephy, A. Kirichenko, A.Yu. Kirsten, F. Landecker, T.L. Lang, D. Lazio, T.J.W. Li, D.Z. Lin, H.-H. Linford, J.D. Masui, K. Mena-Parra, J. Naidu, A. Ng, C. Patel, C. Pen, U.-L. Pleunis, Z. Rafiei-Ravandi, M. Rahman, M. Renard, A. Scholz, P. Siegel, S.R. Smith, K.M. Stairs, I.H. Vanderlinde, K. Zwaniga, A.V. Oude Hoogeveensedijk 4 PD Dwingeloo7991 Netherlands ASTRON Netherlands Institute for Radio Astronomy Oude Hoogeveensedijk 4 PD Dwingeloo7991 Netherlands Anton Pannekoek Institute for Astronomy University of Amsterdam Science Park 904 Amsterdam1098 XH Netherlands Department of Physics McGill University 3600 University Street MontréalQCH3A 2T8 Canada McGill Space Institute McGill University 3550 University Street MontréalQCH3A 2A7 Canada Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Department of Astronomy and Owens Valley Radio Observatory California Institute of Technology PasadenaCA91125 United States Department of Physics and Astronomy West Virginia University P.O. Box 6315 MorgantownWV26506 United States Center for Gravitational Waves and Cosmology West Virginia University Chestnut Ridge Research Building MorgantownWV26505 United States School of Mathematics Physics and Statistics University of Newcastle Newcatle upon TyneNE1 7RU United Kingdom Lane Department of Computer Science and Electrical Engineering MorgantownWV26506 United States Academia Sinica Institute of Astronomy and Astrophysics 645 N. A’ohoku Place HiloHI96720 United States National Radio Astronomy Observatory SocorroNM87801 United States Dunlap Institute for Astronomy & Astrophysics University of Toronto 50 St. George Street TorontoONM5S 3H4 Canada Department of Astronomy & Astrophysics University of Toronto 50 St. George Street TorontoONM5S 3H4 Canada Perimeter Institute for Theoretical Physics WaterlooONN2L 2Y5 Canada Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada Department of Physics and Astronomy University of British Columbia 6224 Agricultural Road VancouverBCV6T 1Z1 Canada Instituto de Astronomía Universidad Nacional Autónoma de México Apdo. Postal 877 EnsenadaBaja California22800 Mexico Ioffe Institute 26 Politekhnicheskaya st. St. Petersburg194021 Russia Department o

Fast radio bursts (FRBs) are brief, bright, extragalactic radio flashes1, 2. Their physical origin remains unknown, but dozens of possible models have been postulated3. Some FRB sources exhibit repeat bursts4–7. Though over a hundred FRB sources have been discovered to date8, only four have been localised and associated with a host galaxy9–12, with just one of the four known to repeat9. The properties of the host galaxies, and the local environments of FRBs, provide important clues about their physical origins. However, the first known repeating FRB has been localised to a low-metallicity, irregular dwarf galaxy, and the apparently non-repeating sources to higher-metallicity, massive elliptical or star-forming galaxies, suggesting that perhaps the repeating and apparently non-repeating sources could have distinct physical origins. Here we report the precise localisation of a second repeating FRB source6, FRB 180916.J0158+65, to a star-forming region in a nearby (redshift z = 0.0337 ±0.0002) massive spiral galaxy, whose properties and proximity distinguish it from all known hosts. The lack of both a comparably luminous persistent radio counterpart and a high Faraday rotation measure6 further distinguish the local environment of FRB 180916.J0158+65 from that of the one previously localised repeating FRB source, FRB 121102. This demonstrates that repeating FRBs have a wide range of luminosities, and originate from diverse host galaxies and local environments. Copyright © 2020, The Authors. All rights reserved.

关键词： Galaxies

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Optimal CMB lensing reconstruction and parameter estimation with SPTpol data

arXiv

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arXiv 2020年

作者： Millea, Marius Daley, C.M. Chou, T.-L. Anderes, E. Ade, P.A.R. Anderson, A.J. Austermann, J.E. Avva, J.S. Beall, J.A. Bender, A.N. Benson, B.A. Bianchini, F. Bleem, L.E. Carlstrom, J.E. Chang, C.L. Chaubal, P. Chiang, H.C. Citron, R. Corbett Moran, C. Crawford, T.M. Crites, A.T. de Haan, T. Dobbs, M.A. Everett, W. Gallicchio, J. George, E.M. Goeckner-Wald, N. Guns, S. Gupta, N. Halverson, N.W. Henning, J.W. Hilton, G.C. Holder, G.P. Holzapfel, W.L. Hrubes, J.D. Huang, N. Hubmayr, J. Irwin, K.D. Knox, L. Lee, A.T. Li, D. Lowitz, A. McMahon, J.J. Meyer, S.S. Mocanu, L.M. Montgomery, J. Natoli, T. Nibarger, J.P. Noble, G. Novosad, V. Omori, Y. Padin, S. Patil, S. Pryke, C. Reichardt, C.L. Ruhl, J.E. Saliwanchik, B.R. Schaffer, K.K. Sievers, C. Smecher, G. Stark, A.A. Thorne, B. Tucker, C. Veach, T. Vieira, J.D. Wang, G. Whitehorn, N. Wu, W.L.K. Yefremenko, V. Department of Physics University of California BerkeleyCA94720 United States Astronomy Department University of Illinois at Urbana-Champaign 1002 W. Green Street UrbanaIL61801 United States Kavli Institute for Cosmological Physics University of Chicago 5640 South Ellis Avenue ChicagoIL60637 United States Department of Physics University of Chicago 5640 South Ellis Avenue ChicagoIL60637 United States Department of Statistics University of California One Shields Avenue DavisCA95616 United States Cardiff University CardiffCF10 3XQ United Kingdom Fermi National Accelerator Laboratory MS209 P.O. Box 500 BataviaIL60510 United States NIST Quantum Devices Group 325 Broadway Mailcode 817.03 BoulderCO80305 United States Department of Physics University of Colorado BoulderCO80309 United States High Energy Physics Division Argonne National Laboratory 9700 S. Cass Avenue ArgonneIL60439 United States Department of Astronomy and Astrophysics University of Chicago 5640 South Ellis Avenue ChicagoIL60637 United States School of Physics University of Melbourne ParkvilleVIC3010 Australia Enrico Fermi Institute University of Chicago 5640 South Ellis Avenue ChicagoIL60637 United States Department of Physics McGill University 3600 Rue University MontrealQCH3A 2T8 Canada School of Mathematics Statistics & Computer Science University of KwaZulu-Natal Durban South Africa University of Chicago 5640 South Ellis Avenue ChicagoIL60637 United States Jet Propulsion Laboratory PasadenaCA91109 United States Dunlap Institute for Astronomy & Astrophysics University of Toronto 50 St George St TorontoONM5S 3H4 Canada Department of Astronomy & Astrophysics University of Toronto 50 St George St TorontoONM5S 3H4 Canada Physics Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Canadian Institute for Advanced Research CIFAR Program in Gravity Extreme Universe TorontoONM5G 1Z8 Canada Department of Astrophysical and Pla

We perform the first simultaneous Bayesian parameter inference and optimal reconstruction of the gravitational lensing of the cosmic microwave background (CMB), using 100 deg2 of polarization observations from the SPTpol receiver on the South Pole Telescope. These data reach noise levels as low as 5.8 µK-arcmin in polarization, which are low enough that the typically used quadratic estimator (QE) technique for analyzing CMB lensing is significantly sub-optimal. Conversely, the Bayesian procedure extracts all lensing information from the data and is optimal at any noise level. We infer the amplitude of the gravitational lensing potential to be Aφ = 0.949 ±0.122 using the Bayesian pipeline, consistent with our QE pipeline result, but with 17% smaller error bars. The Bayesian analysis also provides a simple way to account for systematic uncertainties, performing a similar job as frequentist "bias hardening," and reducing the systematic uncertainty on Aφ due to polarization calibration from almost half of the statistical error to effectively zero. Finally, we jointly constrain Aφ along with AL, the amplitude of lensing-like effects on the CMB power spectra, demonstrating that the Bayesian method can be used to easily infer parameters both from an optimal lensing reconstruction and from the delensed CMB, while exactly accounting for the correlation between the two. These results demonstrate the feasibility of the Bayesian approach on real data, and pave the way for future analysis of deep CMB polarization measurements with SPT-3G, Simons Observatory, and CMB-S4, where improvements relative to the QE can reach 1.5 times tighter constraints on Aφ and 7 times lower effective lensing reconstruction noise. Copyright © 2020, The Authors. All rights reserved.

关键词： Cosmology

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Imaging of director fields in liquid crystals using stimulated Raman scattering microscopy

arXiv

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arXiv 2017年

作者： Lee, Taewoo Mundoor, Haridas Gann, Derek G. Callahan, Timothy J. Smalyukh, Ivan I. Department of Physics Liquid Crystal Materials Research Center University of Colorado BoulderCO80309 United States Department of Electrical Computer and Energy Engineering and Materials Science Engineering Program University of Colorado BoulderCO80309 United States Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado BoulderCO80309 United States

We demonstrate an approach for background-free three-dimensional imaging of director fields in liquid crystals using stimulated Raman scattering microscopy. This imaging technique is implemented using a single femtosecond pulsed laser and a photonic crystal fiber, providing Stokes and pump frequencies needed to access Raman shifts of different chemical bonds of molecules and allowing for chemically selective and broadband imaging of both pristine liquid crystals and composite materials. Using examples of model three-dimensional structures of director fields, we show that the described technique is a powerful tool for mapping of long-range molecular orientation patterns in soft matter via polarized chemical-selective imaging. Copyright © 2017, The Authors. All rights reserved.

关键词： Liquid crystals

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Choreographic and somatic approaches for the development of expressive robotic systems

arXiv

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arXiv 2017年

作者： LaViers, Amy Cuan, Catie Heimerdinger, Madison Huzaifa, Umer Maguire, Catherine McNish, Reika Nilles, Alexandra Pakrasi, Ishaan Bradley, Karen Mata, Kim Brooks Chakraborty, Novoneel Vidrin, Ilya Zurawski, Alexander Mechanical Science and Engineering Department University of Illinois Urbana-Champaign United States Aerospace Engineering Department University of Illinois Urbana-Champaign United States Laban/Bartenieff Institute of Movement Studies Kinesiology and Community Health Department University of Illinois Urbana-Champaign United States Computer Science Department University of Illinois Urbana-Champaign United States Dance Program University of Virginia Integrated Movement Studies Centre for Dance Research Coventry University Department of Theatre Dance and Media Harvard University

As robotic systems are moved out of factory work cells into human-facing environments questions of choreography become central to their design, placement, and application. With a human viewer or counterpart present, a system will automatically be interpreted within context, style of movement, and form factor by human beings as animate elements of their environment. The interpretation by this human counterpart is critical to the success of the system’s integration: "knobs" on the system need to make sense to a human counterpart;an artificial agent should have a way of notifying a human counterpart of a change in system state, possibly through motion profiles;and the motion of a human counterpart may have important contextual clues for task completion. Thus, professional choreographers, dance practitioners, and movement analysts are critical to research in robotics. They have design methods for movement that align with human audience perception;they can help identify simplified features of movement that will effectively accomplish human-robot interaction goals;and they have detailed knowledge of the capacity of human movement. This article provides approaches employed by one research lab, specific impacts on technical and artistic projects within, and principles that may guide future such work. The background section reports on choreography, somatic perspectives, improvisation, the Laban/Bartenieff Movement System, and robotics. From this context methods including embodied exercises, writing prompts, and community building activities have been developed to facilitate interdisciplinary research. The results of this work is presented as an overview of a smattering of projects in areas like high-level motion planning, software development for rapid prototyping of movement, artistic output, and user studies that help understand how people interpret movement. Finally, guiding principles for other groups to adopt are posited. Copyright © 2017, The Authors. All rights reserv

关键词： robotics

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Optical patterning of magnetic domains and defects in ferromagnetic liquid crystal colloids

arXiv

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arXiv 2017年

作者： Hess, Andrew J. Liu, Qingkun Smalyukh, Ivan I. Department of Physics University of Colorado BoulderCO80309 United States Materials Science and Engineering Program Department of Electrical Computer and Energy Engineering Liquid Crystal Materials Research Center University of Colorado BoulderCO80309 United States Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado BoulderCO80309 United States

A promising approach in designing composite materials with unusual physical behavior combines solid nanostructures and orientationally ordered soft matter at the mesoscale. Such composites not only inherit properties of their constituents but also can exhibit emergent behavior, such as ferromagnetic ordering of colloidal metal nanoparticles forming mesoscopic magnetization domains when dispersed in a nematic liquid crystal. Here we demonstrate the optical patterning of domain structures and topological defects in such ferromagnetic liquid crystal colloids, which allows for altering their response to magnetic fields. Our findings reveal the nature of the defects in this soft matter system which is different as compared to non-polar nematics and ferromagnets alike. Copyright © 2017, The Authors. All rights reserved.

关键词： Ferromagnetic materials

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Electric switching of fluorescence decay in gold-silica-dye nematic nanocolloids mediated by surface plasmons

arXiv

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arXiv 2017年

作者： Jiang, Li Mundoor, Haridas Liu, Qingkun Smalyukh, Ivan I. Department of Physics and Soft Materials Research Center University of Colorado BoulderCO80309 United States Department of Electrical Computer and Energy Engineering Materials Science and Engineering Program University of Colorado BoulderCO80309 United States Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado BoulderCO80309 United States

Tunable composite materials with interesting physical behavior can be designed through integrating unique optical properties of solid nanostructures with the facile responses of soft matter to weak external stimuli, but this approach remains challenged by their poorly controlled co-assembly at the mesoscale. Using scalable wet chemical synthesis procedures, we fabricated anisotropic gold-silica-dye colloidal nanostructures and then organized them into the device-scale (demonstrated for square inch cells) electrically tunable composites by simultaneously invoking molecular and colloidal self-assembly. We show that the ensuing ordered colloidal dispersions of shape-anisotropic nanostructures exhibit tunable fluorescence decay rates and intensity. We characterize how these properties depend on low-voltage fields and polarization of both the excitation and emission light, demonstrating a great potential for the practical realization of an interesting breed of nanostructured composite materials. Copyright © 2017, The Authors. All rights reserved.

关键词： Self assembly

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Management of intellectual capital in a system of management accounting information 6

Management of intellectual capital in a system of management...

引用

6th International Conference on computers Communications and Control, ICCCC 2016

作者： Piontkewicz, Regiane Freitas, Maria Do Carmo D. Kemczinski, Avanilde Martin, Claudia Duran San Department of Industrial Engineering Federal University of Paraná Curitiba Brazil Department of Science and Information Management Faculty of Information Management Federal University of Paraná Curitiba Brazil Graduate Program in Applied Computing Computer Science Department Santa Catarina State University Joinville Brazil Department of Industrial Engineering Faculty of Engineering University of Santiago de Chile Santiago Chile

ISBN: (纸本)9781509017355

The recognition of Intellectual Capital as a source of competitive advantage and differentiation element for organizations requires an application of new management strategies that include this feature. Considering the importance of the Accounting Information System (AIS) in organizations, the research has the main objective to investigate the contributions of accounting as Management Information System in management of Intellectual Capital in an organization. Therefore, it was adopted a single case study as research strategy, applied in a Brazilian industry of consumption goods, on the market for over 85 years. The results obtained in the documentary analysis, questionnaires, interviews and literature show that the Accounting Management Information System (AMIS) contributes to the management of Intellectual Capital. In the investigated organization, AMIS is widely used and shows similarities with the specifications found in the literature, possessing the ability of adaptation to receive indicators or variables that enable the management of Intellectual Capital. It was found that the incorporation of the variables of Intellectual Capital in AMIS could be accomplished by adopting the method proposed by López-Ruiz and Nevado-Pena, that uses both traditional financial indicators and indicators of Intellectual Capital, not conflicting with the traditional AMIS, but complementing it. Inserting variables of Intellectual Capital in AMIS also allows uniformity of understanding on the subject by all company managers. © 2016 IEEE.

关键词： Competition

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Thin Films: Artificial Soft Elastic Media with Periodic Hard Inclusions for Tailoring Strain‐Sensitive Thin‐Film Responses (Adv. Mater. 40/2018)

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Advanced Materials 2018年第40期30卷

作者： Junghwan Byun Seungjun Chung Yongtaek Hong Department of Mechanical and Aerospace Engineering Institute of Advanced Machines and Design Soft Robotics Research Center (SRRC) Seoul National University Seoul 08826 Republic of Korea Photo‐Electronic Hybrids Research Center Korea Institute of Science and Technology (KIST) Seoul 02792 Republic of Korea Department of Electrical and Computer Engineering Inter‐University Semiconductor Research Center (ISRC) Seoul National University Seoul 08826 Republic of Korea

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