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

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

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

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,

TIPS for social security?

Social security

Retail deposit sweep programs: issues for measurement, modeling and analysis

Since January 1994, many banks in the United States have initiated retail-deposit sweep programs which reduce statutory reserve requirements by re-labeling transaction deposits as money market deposit accounts. As a result, approximately half of aggregate transaction deposits are now excluded from M1. This re-labeling is invisible to customers and, hence, cannot affect their demand for transaction balances. Nevertheless, a recent article in this Journal explored the effect of this invisible re-labeling on M1 demand. This note emphasizes that those results are spurious, and offers additional examples of measurement distortions due to retail deposit sweep activity.Bank reserves ; Money supply