Browsing MIT Open Access Articles by Title
Now showing items 53247-53266 of 55948
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U(1) X U(1) XI Z(2) Chern-Simons theory and Z(4) parafermion fractional quantum Hall states
(American Physical Society, 2010-01)We study U(1)×U(1)⋊Z2 Chern-Simons theory with integral coupling constants (k,l) and its relation to certain non-Abelian fractional quantum Hall (FQH) states. For the U(1)×U(1)⋊Z2 Chern-Simons theory, we show how to compute ... -
U(1) × U(1) symmetry-protected topological order in Gutzwiller wave functions
(American Physical Society, 2014-12)Gutzwiller projection is a way to construct many-body wave functions that could carry topological order or symmetry-protected topological (SPT) order. However, an important issue is to determine whether or not a given ... -
U-Pb dating of interspersed gabbroic magmatism and hydrothermal metamorphism during lower crustal accretion, Vema lithospheric section, Mid-Atlantic Ridge
(American Geophysical Union (AGU), 2015-04)New U/Pb analyses of zircon and xenotime constrain the timing of magmatism, magmatic assimilation, and hydrothermal metamorphism during formation of the lower crust at the Mid-Atlantic Ridge. The studied sample is an altered ... -
U-shaped fairings suppress vortex-induced vibrations for cylinders in cross-flow
(Cambridge University Press, 2015-10)We employ three-dimensional direct and large-eddy numerical simulations of the vibrations and flow past cylinders fitted with free-to-rotate U-shaped fairings placed in a cross-flow at Reynolds number 100 ⩽ Re ⩽ 10,000. ... -
U-Th dating of lake sediments: Lessons from the 700 ka sediment record of Lake Junín, Peru
(Elsevier BV, 2020)© 2020 Elsevier Ltd Deep sediment cores from long-lived lake basins are fundamental records of paleoenvironmental history, but the power of these reconstructions has been often limited by poor age control. Uranium-thorium ... -
U-Th dating of lake sediments: Lessons from the 700 ka sediment record of Lake Junín, Peru
(Elsevier BV, 2020-09)© 2020 Elsevier Ltd Deep sediment cores from long-lived lake basins are fundamental records of paleoenvironmental history, but the power of these reconstructions has been often limited by poor age control. Uranium-thorium ... -
U.S. Air Quality and Health Benefits from Avoided Climate Change under Greenhouse Gas Mitigation
(Springer-Verlag, 2015-06)We evaluate the impact of climate change on U.S. air quality and health in 2050 and 2100 using a global modeling framework and integrated economic, climate, and air pollution projections. Three internally consistent ... -
U.S. Industrial Transformation and the “How” of 21st Century Industrial Strategy
(Springer Science and Business Media LLC, 2024-04-11)Abstract The U.S. policy paradigm has shifted in the first years of the Biden Administration toward a more robust industrial strategy. Over the next decade, trillions of public and private-sector dollars ... -
²³⁸U/ ²³⁵U measurement in single-zircon crystals: implications for the Hadean environment, magmatic differentiation and geochronology
(Royal Society of Chemistry (RSC), 2019-07)Owing to the challengingly small amounts of uranium (U) they contain, the isotopic composition (²³⁸U/ ²³⁵U) of single zircon grains has never been measured. Leveraging methods we designed for analysis of small sample amounts ... -
UAV Cooperative Control with Stochastic Risk Models
(Institute of Electrical and Electronics Engineers (IEEE), 2011-06)Risk and reward are fundamental concepts in the cooperative control of unmanned systems. This paper focuses on a constructive relationship between a cooperative planner and a learner in order to mitigate the learning risk ... -
uBFT: Microsecond-Scale BFT using Disaggregated Memory
(ACM|Proceedings of the 28th ACM International Conference on Architectural Support for Programming Languages and Operating Systems, Volume 2, 2023-01-27) -
Ubicorder: A mobile device for situated interactions with sensor networks
(Institute of Electrical and Electronics Engineers / IEEE Sensors Council, 2010-09)The Ubicorder is a mobile, location and orientation aware device for browsing and interacting with real-time sensor network data. In addition to browsing data, the Ubicorder also provides a graphical user interface (GUI) ... -
Ubik: efficient cache sharing with strict qos for latency-critical workloads
(Association for Computing Machinery (ACM), 2014-03)Chip-multiprocessors (CMPs) must often execute workload mixes with different performance requirements. On one hand, user-facing, latency-critical applications (e.g., web search) need low tail (i.e., worst-case) latencies, ... -
UbiqBio: Adoptions and Outcomes of Mobile Biology Games in the Ecology of School
(Taylor & Francis, 2014-04)The integration of learning games into schools holds significant promise, yet faces numerous obstacles. Ubiquitous games (casual games for smart phones) attempt to motivate students to engage repeatedly with content beyond ... -
Ubiquitin-Dependent Control of Class II MHC Localization Is Dispensable for Antigen Presentation and Antibody Production
(Public Library of Science (PLoS), 2011-04)Controlled localization of class II MHC molecules is essential for proper class II MHC-restricted antigen presentation and the subsequent initiation of an adaptive immune response. Ubiquitination of class II MHC molecules ... -
Ubiquitination, Ubiquitin-like Modifiers, and Deubiquitination in Viral Infection
(Elsevier, 2009-06)Ubiquitin is important for nearly every aspect of cellular physiology. All viruses rely extensively on host machinery for replication; therefore, it is not surprising that viruses connect to the ubiquitin pathway at many ... -
Ubiquitous giant lyα nebulae around the brightest quasars at z ∼ 3.5 revealed with muse
(IOP Publishing, 2016-10)Direct Lyα imaging of intergalactic gas at z ∼ 2 has recently revealed giant cosmological structures around quasars, e.g., the Slug Nebula. Despite their high luminosity, the detection rate of such systems in narrow-band ... -
Ubiquitous mRNA decay fragments in E. coli redefine the functional transcriptome
(Oxford University Press (OUP), 2022)<jats:title>Abstract</jats:title> <jats:p>Bacterial mRNAs have short life cycles, in which transcription is rapidly followed by translation and degradation within seconds to minutes. The resulting diversity ... -
Ubiquitylation of MYC couples transcription elongation with double-strand break repair at active promoters
(Elsevier BV, 2021)© 2020 Elsevier Inc. The MYC oncoprotein globally affects the function of RNA polymerase II (RNAPII). The ability of MYC to promote transcription elongation depends on its ubiquitylation. Here, we show that MYC and PAF1c ... -
uBoost: a boosting method for producing uniform selection efficiencies from multivariate classifiers
(IOP Publishing, 2013-12)The use of multivariate classifiers, especially neural networks and decision trees, has become commonplace in particle physics. Typically, a series of classifiers is trained rather than just one to enhance the performance; ...
