Browsing MIT Open Access Articles by Title
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FourWay MicrostripBased Power Combining for Microwave Outphasing Power Amplifiers
(Institute of Electrical and Electronics Engineers (IEEE), 201409)A lossless multiway outphasing and power combining system for microwave power amplification is presented. The architecture addresses one of the primary drawbacks of Chireix outphasing; namely, the suboptimal loading ... 
Fourwell highly strained quantum cascade lasers grown by metalorganic chemical vapor deposition
(Institute of Electrical and Electronics Engineers, 200908)We demonstrate a novel fourwell injectorless design with short wavelength (5.5 mum) and room temperature operation utilizing highly strained Ga[subscript 0.35] In[subscript 0.6] As/Al[subscript 0.70] In[subscript 0.30]As ... 
Fourientations and the Tutte polynomial
(Springer International Publishing, 201709)A fourientation of a graph is a choice for each edge of the graph whether to orient that edge in either direction, leave it unoriented, or biorient it. Fixing a total order on the edges and a reference orientation of the ... 
Fourier depth of field
(Association for Computing Machinery (ACM), 200904)Optical systems used in photography and cinema produce depthoffield effects, that is, variations of focus with depth. These effects are simulated in image synthesis by integrating incoming radiance at each pixel over the ... 
Fourier magnetic imaging with nanoscale resolution and compressed sensing speedup using electronic spins in diamond
(Nature Publishing Group, 201508)Optically detected magnetic resonance using nitrogen–vacancy (NV) colour centres in diamond is a leading modality for nanoscale magnetic field imaging, as it provides single electron spin sensitivity, threedimensional ... 
FourierTransform Spectroscopy of [superscript 13]C[superscript 17]O and Deperturbation Analysis of the A[superscript 1]Π (υ=0–3) Levels
(201703)The highresolution B[superscript 1]Σ[superscript +]→A[superscript 1]Π (0, 0) and (0, 3) emission bands of the lessabundant [superscript 13]C[superscript 17]O isotopologue have been investigated by Fouriertransform ... 
Foxa2 and Cdx2 cooperate with Nkx21 to inhibit lung adenocarcinoma metastasis
(Cold Spring Harbor Laboratory Press, 201509)Despite the fact that the majority of lung cancer deaths are due to metastasis, the molecular mechanisms driving metastatic progression are poorly understood. Here, we present evidence that loss of Foxa2 and Cdx2 synergizes ... 
foxF1 Controls Specification of Nonbody Wall Muscle and Phagocytic Cells in Planarians
(Elsevier BV, 201812)Planarians are flatworms capable of regenerating any missing body part in a process requiring stem cells and positional information. Muscle is a major source of planarian positional information and consists of several types ... 
Foxp2 controls synaptic wiring of corticostriatal circuits and vocal communication by opposing Mef2c
(Springer Nature, 201609)Corticobasal ganglia circuits are critical for speech and language and are implicated in autism spectrum disorder, in which language function can be severely affected. We demonstrate that in the mouse striatum, the gene ... 
Förster resonance energy transfer, absorption and emission spectra in multichromophoric systems. I. Full cumulant expansions and systembath entanglement
(American Institute of Physics (AIP), 201503)We study the Förster resonant energy transfer rate, absorption and emission spectra in multichromophoric systems. The multichromophoric Förster theory (MCFT) is determined from an overlap integral of generalized matrices ... 
Förster resonance energy transfer, absorption and emission spectra in multichromophoric systems. II. Hybrid cumulant expansion
(American Institute of Physics (AIP), 201503)We develop a hybrid cumulant expansion method to account for the systembath entanglement in the emission spectrum in the multichromophoric Förster transfer rate. In traditional perturbative treatments, the emission ... 
Förster resonance energy transfer, absorption and emission spectra in multichromophoric systems. III. Exact stochastic path integral evaluation
(American Institute of Physics (AIP), 201503)A numerically exact path integral treatment of the absorption and emission spectra of open quantum systems is presented that requires only the straightforward solution of a stochastic differential equation. The approach ... 
FPGA Implementation of a CryptographicallySecure PUF Based on Learning Parity with Noise
(MDPI AG, 201712)Herder et al. (IEEE Transactions on Dependable and Secure Computing, 2017) designed a new computational fuzzy extractor and physical unclonable function (PUF) challengeresponse protocol based on the Learning Parity with ... 
FPGABased Spectral Envelope Preprocessor for Power Monitoring and Control
(Institute of Electrical and Electronics Engineers, 201003)Smart Grid and Smart Meter initiatives seek to enable energy providers and consumers to intelligently manage their energy needs through realtime monitoring, analysis, and control. We have developed an inexpensive FPGA ... 
FPGAbased true random number generation using circuit metastability with adaptive feedback control
(Springer Berlin / Heidelberg, 201109)The paper presents a novel and efficient method to generate true random numbers on FPGAs by inducing metastability in bistable circuit elements, e.g. flipflops. Metastability is achieved by using precise programmable ... 
FPM: Fine Pose PartsBased Model with 3D CAD Models
(SpringerVerlag, 2014)We introduce a novel approach to the problem of localizing objects in an image and estimating their finepose. Given exact CAD models, and a few real training images with aligned models, we propose to leverage the geometric ... 
An FPTAS for optimizing a class of lowrank functions over a polytope
(SpringerVerlag, 201201)We present a fully polynomial time approximation scheme (FPTAS) for optimizing a very general class of nonlinear functions of low rank over a polytope. Our approximation scheme relies on constructing an approximate ... 
The fractal globule as a model of chromatin architecture in the cell
(SpringerVerlag, 201101)The fractal globule is a compact polymer state that emerges during polymer condensation as a result of topological constraints which prevent one region of the chain from passing across another one. This longlived intermediate ... 
Fractal IsoContours of Passive Scalar in TwoDimensional Smooth Random Flows
(Springer US, 201204)A passive scalar field was studied under the action of pumping, diffusion and advection by a 2D smooth flow with Lagrangian chaos. We present theoretical arguments showing that the scalar statistics are not conformally ... 
Fractal Uncertainty for Transfer Operators
(Oxford University Press (OUP), 201803)We show directly that the fractal uncertainty principle of Bourgain–Dyatlov [3] implies that there exists σ > 0 for which the Selberg zeta function (1.2) for a convex cocompact hyperbolic surface has only finitely many ...