Browsing MIT Open Access Articles by Title
Now showing items 119-138 of 55825
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2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF
(American Astronomical Society, 2009-04)We present the serendipitous discovery of an L subdwarf in the Two Micron All Sky Survey (2MASS) J06164006–6407194, in a search of the 2MASS for T dwarfs. Its spectrum exhibits features indicative of both a cool and metal ... -
2MASS J20261584–2943124: AN UNRESOLVED L0.5 + T6 SPECTRAL BINARY
(IOP Publishing, 2010-05)We identify the L dwarf 2MASS J20261584–2943124 as an unresolved spectral binary, based on low-resolution, near-infrared spectroscopy from IRTF/SpeX. The data reveal a peculiar absorption feature at 1.6 μm, previously noted ... -
A 2R[subscript ⊕] Planet Orbiting the Bright Nearby K Dwarf Wolf 503
(American Astronomical Society, 2018-10-08)Since its launch in 2009, the Kepler telescope has found thousands of planets with radii between that of Earth and Neptune. Recent studies of the distribution of these planets have revealed a gap in the population near ... -
2′-O Methylation of Internal Adenosine by Flavivirus NS[subscript 5] Methyltransferase
(Public Library of Science, 2012-04)RNA modification plays an important role in modulating host-pathogen interaction. Flavivirus NS5 protein encodes N-7 and 2′-O methyltransferase activities that are required for the formation of 5′ type I cap (m[superscript ... -
3' UTR-isoform choice has limited influence on the stability and translational efficiency of most mRNAs in mouse fibroblasts
(Cold Spring Harbor Laboratory Press, 2013-09)Variation in protein output across the genome is controlled at several levels, but the relative contributions of different regulatory mechanisms remain poorly understood. Here, we obtained global measurements of decay and ... -
3,5-Diphenyl-2-phosphafuran: Synthesis, Structure, and Thermally Reversible [4 + 2] Cycloaddition Chemistry
(American Chemical Society (ACS), 2020)© 2020 American Chemical Society Treatment of trans-chalcone with dibenzo-7-phosphanorbornadiene EtOPA (A = C14H10, anthracene), a source of ethoxyphosphinidene, followed by formal elimination of ethanol yields ... -
3,5-Diphenyl-2-phosphafuran: Synthesis, Structure, and Thermally Reversible [4 + 2] Cycloaddition Chemistry
(American Chemical Society (ACS), 2020)© 2020 American Chemical Society Treatment of trans-chalcone with dibenzo-7-phosphanorbornadiene EtOPA (A = C14H10, anthracene), a source of ethoxyphosphinidene, followed by formal elimination of ethanol yields ... -
3-D Ionospheric Electron Density Variations during the 2017 Great American Solar Eclipse: A Revisit
(Multidisciplinary Digital Publishing Institute, 2023-08-31)This paper studies the three-dimensional (3-D) ionospheric electron density variation over the continental US and adjacent regions during the August 2017 Great American Solar Eclipse event, using Millstone Hill incoherent ... -
3-D resistivity forward modeling and inversion using conjugate gradients
(Society of Exploration Geophysicists, 1995-09)We have developed rapid 3-D dc resistivity forward modeling and inversion algorithms that use conjugate gradient relaxation techniques. In the forward network modeling calculation, an incomplete Cholesky decomposition for ... -
3-Dimensional Multiwaveguide Probe Array for Light Delivery to Distributed Brain Circuits
(Optical Society of America, 2012-11)To deliver light to the brain for neuroscientific and neuroengineering applications like optogenetics, in which light is used to activate or silence neurons expressing specific photosensitive proteins, optical fibers are ... -
3-GHz, ultrafast Yb-fiber laser sources: closing the spectral gaps
(SPIE, 2014-09)Many applications require GHz femtosecond pulses with the center wavelength tunable over a broad range. Recently we have demonstrated a 3-GHz, femtosecond Yb-fiber laser system with >12-W average power using the pre-chirp ... -
3-Ketoacyl thiolase delays aging of Caenorhabditis elegans and is required for lifespan extension mediated by sir-2.1
(National Academy of Sciences, 2010-11)Studies of long-lived Caenorhabditis elegans mutants have identified several genes that function to limit lifespan, i.e., loss-of-function mutations in these genes promote longevity. By contrast, little is known about ... -
3-Message Zero Knowledge Against Human Ignorance
(Springer-Verlag, 2016-10)The notion of Zero Knowledge has driven the field of cryptography since its conception over thirty years ago. It is well established that two-message zero-knowledge protocols for NP do not exist, and that four-message ... -
3.1.2 Design Catalogues: An Efficient Search Approach for Improved Flexibility in Engineering Systems Design
(Wiley Blackwell, 2014-11)This paper proposes and demonstrates design catalogues as a computationally efficient method for identifying improved designs for complex technological systems. This new process significantly speeds up the analysis of ... -
3.3-Å resolution cryo-EM structure of human ribonucleotide reductase with substrate and allosteric regulators bound
(eLife Sciences Publications, Ltd, 2018-02)Ribonucleotide reductases (RNRs) convert ribonucleotides into deoxyribonucleotides, a reaction essential for DNA replication and repair. Human RNR requires two subunits for activity, the α subunit contains the active site, ... -
A 3.4-pJ FeRAM-Enabled D Flip-Flop in 0.13-µm CMOS for Nonvolatile Processing in Digital Systems
(Institute of Electrical and Electronics Engineers (IEEE), 2013-10)In order to realize a digital system with no distinction between “on” and “off,” the computational state must be stored in nonvolatile memory elements. If the energy cost and time cost of managing the computational state ... -
A 3.4pJ FeRAM-enabled D flip-flop in 0.13µm CMOS for nonvolatile processing in digital systems
(Institute of Electrical and Electronics Engineers (IEEE), 2013-02)Nonvolatile processing-continuously operating a digital circuit and retaining state through frequent power interruptions-creates new applications for portable electronics operating from harvested energy and high-performance ... -
3.5 Thz Quantum Cascade Laser at 70 K as Local Oscillator
(2011-04)We report a set of measurements to demonstrate a new type of surface emitting distributed feedback (DFB) quantum cascade laser (QCL) operated at 3.5 THz as a local oscillator by pumping a superconducting hot-electron ... -
30 nm In[subscript 0.7]Ga[subscript 0.3]As inverted-type HEMTs with reduced gate leakage current for logic applications
(Institute of Electrical and Electronics Engineers, 2010-03)We have fabricated 30 nm In0.7Ga0.3As Inverted-Type HEMTs with outstanding logic performance, scalability and high frequency characteristics. The motivation for this work is the demonstration of reduced gate leakage current ... -
30 to 50 ns liquid-crystal optical switches
(SPIE, 2010-02)The optical switching times of liquid-crystal cells using 5CB, 5OCB and PCH5 liquid crystal materials have been characterized as a function of applied voltage, V, and temperature, T. The transition time from 90 to 10 % ...