Browsing MIT Open Access Articles by Issue Date
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Sensing the 'Health State' of our Society
(Institute of Electrical and Electronics Engineers, )Mobile phones are a pervasive platform for opportunistic sensing of behaviors and opinions. We show that location and communication sensors can be used to model individual symptoms, longterm health outcomes, and diff ... 
Choosing the number of moments in conditional moment restriction models
()Properties of GMM estimators are sensitive to the choice of instruments. Using many instruments leads to high asymptotic asymptotic efficiency but can cause high bias and/or variance in small samples. In this paper we ... 
A bar operator for involutions in a Coxeter group
(Institute of Mathematics, Academia Sinica, )In [LV] the authors defined a Hecke algebra action and a bar involution on a vector space spanned by the involutions in a Weyl group. In this paper we give a new definition of the Hecke algebra action and the bar operator ... 
Puzzles from the First Globalization
(Cambridge University Press, )In the first globalization, 18701914, as in our own times, debates raged over the impact on domestic life of free movement across borders of goods, people, and capital. Then as today in the hard times that have followed ... 
An Actualist's Guide to Quantifying In
(Instituto de Investigaciones Filosóficas of the National Autonomous University of Mexico, )I develop a device for simulating quanti cation over merely possible objects from the perspective of a modal actualistsomeone who thinks that everything that exists actually exists. 
Dynamics and Stability of Constitutions, Coalitions, and Clubs
(American Economic Association, )A central feature of dynamic collective decisionmaking is that the rules that govern procedures for future decisionmaking and the distribution of political power across players are determined by current decisions. For ... 
Chromatic number, clique subdivisions, and the conjectures of Hajos and ErdosFajtlowicz
(SpringerVerlag, )For a graph G, let (G) denote its chromatic number and (G) denote the order of the largest clique subdivision in G. Let H(n) be the maximum of (G)= (G) over all nvertex graphs G. A famous conjecture of Haj os from ... 
NeoFregeanism Reconsidered
()1. Platonism. Mathematical Platonism is the view that mathematical objects exist. Traditional Platonists believe that a world with no mathematical objects is consistent; subtle Platonists believe that such a world would ... 
ErdosSzekerestype theorems for monotone paths and convex bodies
(Oxford University Press, )For any sequence of positive integers j_1 < j_2 < ... < j_n, the ktuples (j_i,j_{i + 1},...,j_{i + k1}), i=1, 2,..., n  k+1, are said to form a monotone path of length n. Given any integers n\ge k\ge 2 and q\ge 2, what ... 
Progress and Status of the Openmc Monte Carlo Code
(American Nuclear Society, 1305)The present work describes the latest advances and progress in the development of the OpenMC Monte Carlo code, an opensource code originating from the Massachusetts Institute of Technology. First, an overview of the ... 
Passive directional subambient daytime radiative cooling
(Nature Publishing Group, 1811)Demonstrations of passive daytime radiative cooling have primarily relied on complex and costly spectrally selective nanophotonic structures with high emissivity in the transparent atmospheric spectral window and high ... 
Metabolic and Neuropsychiatric Effects of Calorie Restriction and Sirtuins
(Annual Reviews, 20110)Most living organisms, including humans, age. Over time the ability to do physical and intellectual work deteriorates, and susceptibility to infectious, metabolic, and neurodegenerative diseases increases, which leads to ... 
A synergistic DNA logic predicts genomewide chromatin accessibility
(Cold Spring Harbor Laboratory Press, 20608)Enhancers and promoters commonly occur in accessible chromatin characterized by depleted nucleosome contact; however, it is unclear how chromatin accessibility is governed. We show that logadditive cisacting DNA sequence ... 
Active matter logic for autonomous microfluidics
(Nature Publishing Group, 20704)Chemically or optically powered active matter plays an increasingly important role in materials design, but its computational potential has yet to be explored systematically. The competition between energy consumption and ... 
A Unique Method of Defense of Bremus (Bombus) Fervidus Fabricius
(Hindawi Publishing Corporation, 1922)It is a wellknown fact that bumblebees, especially the more ferocious species, are quick to attack with sting and mandibles if any vertebrate ventures too close to their nests. Similar punishment is meted out by many ... 
Notes on the Nesting Habits of Several North American Bumblebees
(Hindawi Publishing Corporation, 1922)In a comprehensive paper on the bumblebees of Central Europe, Friese and Wagner (1910, p. 69) make the following statement: "Insbesondere lasst die Kenntniss der Nester noch allzuviel zu wunschen ubrig, was um so empfindlicher ... 
Distortion of magnetotelluric sounding curves by three‐dimensional structures
(Society of Exploration Geophysicists, 198505)Distortions of magnetotelluric fields caused by threedimensional (3D) structures can be severe and are not predictable using onedimensional or twodimensional modeling. I used a 3D modeling algorithm based upon an ... 
Sources of Innovation
(Oxford University Press, 1988)It has long been assumed that product innovations are typically developed by product manufacturers. Because this assumption deals with the basic matter of who the innovator is, it has inevitably had a major impact on ... 
Lead User Analyses for the Development of New Industrial Products
(Institute for Operations Research and the Management Sciences (INFORMS), 198805)Recently, a “lead user” concept has been proposed for new product development in fields subject to rapid change (von Hippel [von Hippel, E. 1986. Lead users: A source of novel product concepts. Management Sci. 32 791–805.]). ... 
Randomness and Computation
(JAI Press Ltd., 1989)