On an SO(5) unification attempt for the cuprates

In this note we bring out several problems with the SO(5) unification attempt of Zhang [cond-mat/9610140].Comment: 3 pages, latex (revtex

Phase detector assembly Patent

Detector assembly for discriminating first signal with respect to presence or absence of second signal at time of occurrence of first signa

From ZigZag to BigBag: Seeing the Wood and the Trees

This paper reports on a one year speculative research project that sought to test the technical feasibility, practical implications and usability of transforming an XML Encoded Archival Description (EAD) finding aid into an XML ZigZag™ structure and applying a relational browser interface

Lessons Learned from the Pioneers 10/11 for a Mission to Test the Pioneer Anomaly

Analysis of the radio-metric tracking data from the Pioneer 10/11 spacecraft at distances between 20--70 astronomical units (AU) from the Sun has consistently indicated the presence of an anomalous, small, constant Doppler frequency drift. The drift is a blue-shift, uniformly changing with rate a_t = (2.92 +/- 0.44) x 10^(-18) s/s^2. It can also be interpreted as a constant acceleration of a_P = (8.74 +/- 1.33) x 10^(-8) cm/s^2 directed towards the Sun. Although it is suspected that there is a systematic origin to the effect, none has been found. As a result, the nature of this anomaly has become of growing interest. Here we discuss the details of our recent investigation focusing on the effects both external to and internal to the spacecraft, as well as those due to modeling and computational techniques. We review some of the mechanisms proposed to explain the anomaly and show their inability to account for the observed behavior of the anomaly. We also present lessons learned from this investigation for a potential deep-space experiment that will reveal the origin of the discovered anomaly and also will characterize its properties with an accuracy of at least two orders of magnitude below the anomaly's size. A number of critical requirements and design considerations for such a mission are outlined and addressed.Comment: 11 pages, invited talk given at ``35th COSPAR Scientific Assebly,'' July 18-24, 2004, Paris, Franc

A COMPARISON OF THE UTILIZATION OF STOCKS WITH PATCHY DISTRIBUTION AND MIGRATION UNDER OPEN ACCESS AND MARINE RESERVES: AN EXTENDED ANALYSIS

This paper compares the utilization of fisheries that reside is spatially differentiated patches that are interrelated by migration under open access and marine reserves. The purpose is to provide a better understanding of fisheries operation in patches and to study the effects of marine reserves on aggregate stock size, harvest, and fleet size. It is an extension of a model developed by Sanchirico and Wilen (2001), SW. One extension is a detailed analysis of vessel behavior taking into account the distance from port. Another is the introduction of isogrowth curves and bioeconomic equilibrium stock (BES) curves that are used with the concept of the feasible region introduced by SW. The isogrowth curves provide a more transparent analysis of the effect of marine reserves on aggregate harvest. The BES curves allow for a direct analysis of when a bioeconomic equilibrium exists, and if so, whether it is in the interior or on the border of the feasible region. In the latter case, fishing will occur in only one patch, while in the former it will occur in both patches. In addition, the BES curves can be used to show that with more general assumptions, the bioeconomic equilibrium stock size in one patch can be dependent upon the size of the stock in the other. This allows for a richer analysis of the effect of marine reserves on aggregate stock size.Resource /Energy Economics and Policy,

Is more QE in sight?

Most analysts have concluded that the LSAP successfully reduced long-term market interest rates. How, exactly, do LSAP-style programs succeed?Monetary policy ; Financial crises

How well do wages follow productivity growth?

Labor productivity ; Wages

Replicability, real-time data, and the science of economic research: FRED, ALFRED, and VDC

This article discusses the linkages between two recent themes in economic research: "real time" data and replication. These two themes share many of the same ideas, specifically, that scientific research itself has a time dimension. In research using real-time data, this time dimension is the date on which particular observations, or pieces of data, became available. In work with replication, it is the date on which a study (and its results) became available to other researchers and/or was published. Recognition of both dimensions of scientific research is important. A project at the Federal Reserve Bank of St. Louis to place large amounts of historical data on the Internet holds promise to unify these two themes.Research ; Federal Reserve Bank of St. Louis