Browsing MIT Open Access Articles by Title
Now showing items 128-147 of 55747
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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 % ... -
30 years of advances in functionalization of carbon nanomaterials for biomedical applications: a practical review
(Cambridge University Press, 2016-12)Carbon-based nanomaterials (CANOMATs), including fullerenes, carbon nanotubes, graphene, and their derivatives, are widely considered to be the next-generation materials for a broad range of biomedical applications, owing ... -
30-nm InAs PHEMTs With f[subscript T] = 644 GHz and f[subscript max] = 681 GHz
(Institute of Electrical and Electronics Engineers, 2010-07)We present 30-nm InAs pseudomorphic HEMTs (PHEMTs) on an InP substrate with record fT characteristics and well-balanced fT and f[subscript max] values. This result was obtained by improving short-channel effects through ... -
THE 300 km s[superscript –1] STELLAR STREAM NEAR SEGUE 1: INSIGHTS FROM HIGH-RESOLUTION SPECTROSCOPY OF ITS BRIGHTEST STAR
(IOP Publishing, 2013-06)We present a chemical abundance analysis of 300S-1, the brightest likely member star of the 300 km s[superscript –1] stream near the faint satellite galaxy Segue 1. From a high-resolution Magellan/MIKE spectrum, we determine ... -
A 32-mu W 1.83-kS/s Carbon Nanotube Chemical Sensor System
(Institute of Electrical and Electronics Engineers, 2009-01)This paper presents an energy-efficient chemical sensor system that uses carbon nanotubes (CNT) as the sensing medium. The room-temperature operation of CNT sensors eliminates the need for micro hot-plate arrays, which ... -
A 32-Unit 240-GHz Heterodyne Receiver Array in 65-nm CMOS With Array-Wide Phase Locking
(Institute of Electrical and Electronics Engineers (IEEE), 2019)© 1966-2012 IEEE. This paper reports a 32-unit phase-locked dense heterodyne receiver array at fmathrm RF=240 GHz. To synthesize a large receiving aperture without large sidelobe response, this chip has the following two ... -
A 33 yr CONSTANCY OF THE X-RAY CORONAE OF AR Lac AND ECLIPSE DIAGNOSIS OF SCALE HEIGHT
(IOP Publishing, 2014-02)Extensive X-ray and EUV photometric observations of the eclipsing RS CVn system AR Lac were obtained over the years 1997-2013 with the Chandra X-Ray Observatory Extreme-Ultraviolet Explorer (EUVE). During primary eclipse, ... -
341 Repeats is Not Enough for Methylation in a New Fragile X Mouse Model
(Society for Neuroscience, 2022)<jats:title>Abstract</jats:title><jats:p>Fragile X syndrome (FXS) is a leading monogenic cause of intellectual disability and autism spectrum disorders, spurring decades of intense research and a multitude of mouse models. ... -
A 350 mu W CMOS MSK Transmitter and 400 mu W OOK Super-Regenerative Receiver for Medical Implant Communications
(Institute of Electrical and Electronics Engineers, 2009-03)Recent advances in the medical field are spurring the need for ultra-low power transceivers for wireless communication with medical implants. To deal with the growing demand for medical telemetry, the FCC commissioned the ...