Review, The New Era of Secret Law

In a recent Brennan Center report, The New Era of Secret Law, Elizabeth (Liza) Goitein articulates, examines, and evaluates the claims for and objections to secret law. Under this banner, the report includes any law that is withheld from the public, regardless of whether it may be shared among agencies or with certain members or committees of Congress.” Goitein’s underlying goal is to propose procedural and substantive reforms. Secret Law is a deeply-researched and highly valuable policy brief with an aim of making specific policy recommendations. And readable to boot

Multiwavelength active optics Shack-Hartmann sensor for seeing and turbulence outer scale monitoring

Real-time seeing and outer scale estimation at the location of the focus of a telescope is fundamental for the adaptive optics systems dimensioning and performance prediction, as well as for the operational aspects of instruments. This study attempts to take advantage of multiwavelength long exposure images to instantaneously and simultaneously derive the turbulence outer scale and seeing from the full-width at half-maximum (FWHM) of seeing-limited images taken at the focus of a telescope. These atmospheric parameters are commonly measured in most observatories by different methods located away from the telescope platform, and thus differing from the effective estimates at the focus of a telescope, mainly because of differences in pointing orientation, height above the ground, or local seeing bias (dome contribution). Long exposure images can either directly be provided by any multiwavelength scientific imager or spectrograph, or alternatively from a modified active optics Shack-Hartmann sensor (AOSH). From measuring simultaneously the AOSH sensor spot point spread function FWHMs at different wavelengths, one can estimate the instantaneous outer scale in addition to seeing. Although AOSH sensors are specified to measure not spot sizes but slopes, real-time r0 and L0 measurements from spot FWHMs can be obtained at the critical location where they are needed with major advantages over scientific instrument images: insensitivity to the telescope field stabilization, and being continuously available. Assuming an alternative optical design allowing simultaneous multiwavelength images, AOSH sensor gathers all the advantages for real-time seeing and outer scale monitoring. With the substantial interest in the design of extremely large telescopes, such a system could have a considerable importance.Comment: Accepted for publication in A&A. arXiv admin note: text overlap with arXiv:1201.233

10,000 stand in line for 46 jobs, circa 1977

Newspaper article about job seekers interested in the Anaconda American Brass job openings, Buffalo, NY

Deterioration of an airline described, and Insurance will protect traveler if airline declares bankruptcy, circa 1999

Two articles describe the bankruptcy of Continental Airlines and the American Automobile Association\u27s announced plan for refunds or replacement of tickets held with an airline that defaults

A periodicity criterion and the section problem on the Mapping Class Group

Some years ago, V. Markovic proved that there is no section of the Mapping Class Group for a closed surface of genus g larger than 5 (in the case of homeomorphims) and more recently generalized this result with D. Saric to the case where g is larger than 1. We will state a periodicity criterion and will use it to simplify some of the arguments given by Markovic and Saric in the proof of their theorem. The periodicity criterion tells us that a homeomorphism of a connected surface must be periodic if the set of connected periodic open sets generates the topology of the surface.Comment: 40 page