Browsing MIT Open Access Articles by Title
Now showing items 1579315812 of 32312

Lowthreshold lasing action in photonic crystal slabs enabled by Fano resonances
(Optical Society of America, 201101)We present a theoretical analysis of lasing action in photonic crystal surfaceemitting lasers (PCSELs). The semiclassical laser equations for such structures are simulated with three different theoretical techniques: exact ... 
Lowthreshold terahertz quantumcascade lasers with onewell injector operating up to 174 K
(Institute of Electrical and Electronics Engineers, 200908)We report operation of v ~ 2.7 THz quantumcascade lasers (QCLs) up to 174 K. A new threewell active region, onewell injector scheme is utilized to lower the operating current densities. While the temperature performance ... 
LowTransitionTemperature Mixtures (LTTMs) for Dissolving Proteins and for Drug Formulation
(Springer US, 201508)Several diverse proteins are found to readily dissolve in neat lowtransitiontemperature mixtures (LTTMs). They undergo no irreversible denaturation in such unusual solvents, and the resistance of hen eggwhite lysozyme ... 
LowVariance Monte Carlo Simulation of Thermal Transport in Graphene
(American Society of Mechanical Engineers (ASME), 201211)ue to its unique thermal properties, graphene has generated considerable interest in the context of thermal management applications. In order to correctly treat heat transfer in this material, while still reaching devicelevel ... 
A lowvoltage energysampling IRUWB digital baseband employing quadratic correlation
(Institute of Electrical and Electronics Engineers, 201006)This paper describes a digital baseband designed for use in a noncoherent IRUWB system. Owing to the nonlinear statistics introduced by the energysampling RF frontend, the baseband employs a new quadratic correlation ... 
Lowvolume multiplexed proteolytic activity assay and inhibitor analysis through a picoinjector array
(Royal Society of Chemistry (RSC), 201412)Secreted active proteases, from families of enzymes such as matrix metalloproteinases (MMPs) and ADAMs (a disintegrin and metalloproteinases), participate in diverse pathological processes. To simultaneously measure multiple ... 
Lower and upper bounds for linkage discovery
(Institute of Electrical and Electronics Engineers, 200902)For a realvalued function f defined on {0,1}n , the linkage graph of f is a hypergraph that represents the interactions among the input variables with respect to f . In this paper, lower and upper bounds for the number ... 
A lower bound for distributed averaging algorithms on the line graph
(Institute of Electrical and Electronics Engineers (IEEE), 201102)We derive lower bounds on the convergence speed of a widely used class of distributed averaging algorithms. In particular, we prove that any distributed averaging algorithm whose state consists of a single real number and ... 
Lower Bound on Expected Communication Cost of Quantum Huffman Coding
(Schloss DagstuhlLeibnizZentrum fuer Informatik, 201609)Data compression is a fundamental problem in quantum and classical information theory. A typical version of the problem is that the sender Alice receives a (classical or quantum) state from some known ensemble and needs ... 
A lower bound on the performance of dynamic curing policies for epidemics on graphs
(Institute of Electrical and Electronics Engineers (IEEE), 201602)We consider an SIStype epidemic process that evolves on a known graph. We assume that a fixed curing budget can be allocated at each instant to the nodes of the graph, towards the objective of minimizing the expected ... 
Lower bounds for nodal sets of eigenfunctions
(SpringerVerlag, 201103)We prove lower bounds for the Hausdorff measure of nodal sets of eigenfunctions. 
Lower Bounds for Randomized Consensus under a Weak Adversary
(Society for Industrial and Applied Mathematics, 201012)This paper studies the inherent tradeoff between termination probability and total step complexity of randomized consensus algorithms. It shows that for every integer $k$, the probability that an $f$resilient randomized ... 
Lower bounds for sparse recovery
(Society for Industrial and Applied Mathematics, 201001)We consider the following ksparse recovery problem: design an m x n matrix A, such that for any signal x, given Ax we can efficiently recover ^x satisfying x ^x1 [less than or equal to] C min[subscript k]sparse ... 
Lower bounds on nonnegative rank via nonnegative nuclear norms
(SpringerVerlag, 201411)The nonnegative rank of an entrywise nonnegative matrix A ∈ R[m×n over +] is the smallest integer r such that A can be written as A = UV where U ∈ R[m×r over +] and V ∈ R[r×n over +] are both nonnegative. The nonnegative ... 
Lower bounds on Ricci curvature and quantitative behavior of singular sets
(SpringerVerlag, 201203)Let Yn denote the GromovHausdorff limit M[superscript n][subscript i][d[subscript GH] over ⟶]Y[superscript n] of vnoncollapsed Riemannian manifolds with Ric[subscript M[superscript n][subscript i]] ≥ −(n−1). The ... 
Lower bounds on the estimation error in problems of distributed computation
(Institute of Electrical and Electronics Engineers, 200902)Informationtheoretic lower bounds on the estimation error are derived for problems of distributed computation. These bounds hold for a network attempting to compute a realvectorvalued function of the global information, ... 
Lower bounds on the performance of Analog to Digital Converters
(Institute of Electrical and Electronics Engineers (IEEE), 201203)This paper deals with the task of finding certified lower bounds for the performance of Analog to Digital Converters (ADCs). A general ADC is modeled as a causal, discretetime dynamical system with outputs taking values ... 
Lower Bounds on the Rate of Learning in Social Networks
(Institute of Electrical and Electronics Engineers, 200907)e study the rate of convergence of Bayesian learning in social networks. Each individual receives a signal about the underlying state of the world, observes a subset of past actions and chooses one of two possible actions. ... 
Lower Bounds on van der Waerden Numbers: Randomized and DeterministicConstructive
(Electronic Journal of Combinatorics, 201103)The van der Waerden number W(k,2) is the smallest integer n such that every 2coloring of 1 to n has a monochromatic arithmetic progression of length k. The existence of such an n for any k is due to van der Waerden but ... 
Lower central series of a free associative algebra over the integers and finite fields
(Elsevier, 201209)Consider the free algebra A[subscript n] generated over Q by n generators x[subscript 1],…,x[subscript n]. Interesting objects attached to A=A[subscript n] are members of its lower central series, L[subscript i] = L[subscript ...