Spurious Eccentricities of Distorted Binary Components

I discuss the effect of physical distortion on the velocities of close binary components and how we may use the resulting distortion of velocity curves to constrain some properties of binary systems, such as inclination and mass ratio. Precise new velocities for 5 Cet convincingly detect these distortions with their theoretically predicted phase dependence. We can even use such distortions of velocity curves to test Lucy's theory of convective gravity darkening. The observed distortions for TT Hya and 5 Cet require the contact components of those systems to be gravity darkened, probably somewhat more than predicted by Lucy's theory but clearly not as much as expected for a radiative star. These results imply there is no credible evidence for eccentric orbits in binaries with contact components. I also present some speculative analyses of the observed properties of a binary encased in a non-rotating common envelope, if such an object could actually exist, and discuss how the limb darkening of some recently calculated model atmospheres for giant stars may bias my resuts for velocity-curve distortions, as well as other results from a wide range of analyses of binary stars.Comment: 14 pp, 2 tables, 12 fig; under review by Ap

Report of the Georgia Governor’s Wokers’ Compensation Review Commission

The Commission appointed by Governor Barnes consists of fourteen members, three ex officio members, and seven advisory members. This group includes academics, members of the legislature, claimants attorneys, defense attorneys, representatives from the insurance industry, organized labor, the textile industry, and government agencies. It was charged by the Governor to review and evaluate Georgia’s laws and procedures affecting workers’ compensation. The Commission’s primary goal was to prepare an accurate description of the current workers’ compensation system in Georgia. More specifically, this Report provides detailed information regarding the number of claims, benefits paid to employees, employer costs, and insurance profitability. It also compares workers’ compensation costs and benefits in Georgia with those in other states, particularly our Southeastern neighbors. Our purpose is to determine whether workers’ compensation costs place Georgia employers at a competitive disadvantage in regional and national markets. In preparing this Report, the Commission relied on the most recent available reports and data collected by organizations such as the National Academy of Social Insurance, the National Council on Compensation Insurance, the Workers Compensation Research Institute, the United States Department of Labor, and the Georgia State Board of Workers’ Compensation.Workers' Compemsation, wages, unemployment, disability, indemnity

Chlamydia diagnosis rate in England in 2012: an ecological study of local authorities

Objectives Local authorities (LAs) in England commission chlamydia screening as part of the National Chlamydia Screening Programme. It is recommended that LAs achieve a chlamydia diagnosis rate of ≥2300 cases per 100 000 population aged 15–24. We describe national patterns in attainment of the chlamydia diagnosis rate recommendation and possible implications of using it to measure LA-level performance. Methods We used publicly available data sets from England (2012) to explore the association between LAs attaining the recommended chlamydia diagnosis rate and population size, socioeconomic deprivation, test setting and sex. Results We used data from 1 197 121 recorded chlamydia tests in females and 564 117 in males. The chlamydia diagnosis rate recommendation was achieved by 22% (72/324) of LAs overall (43% female population; 8% male population). LAs in the highest deprivation quintile were more likely to reach the recommendation than those in the least-deprived quintile for both sexes (women: unadjusted prevalence ratio (UPR) 7.43, 95% CI 3.65 to 15.11; men: UPR 7.00, 95% CI 1.66 to 29.58). The proportion of tests performed in genitourinary medicine clinics was negatively associated with attainment of the recommended diagnosis rate (UPR 0.95, 0.93 to 0.97). Conclusions Chlamydia diagnosis rate recommendations that reflect local area deprivation (as a proxy for disease burden) may be more appropriate than a single national target if the aim is to reduce health inequalities nationally. We suggest LAs monitor their chlamydia diagnosis rate, test coverage and test positivity across a range of measures (including setting and sex) and pre/post changes to commissioned services. Critical evaluation of performance against the recommendation should be reflected in local commissioning decisions

Socializing, Shared Experience and Popular Culture

We argue that socializing is an important economic activity because it is vital to our well being, and that an important input into the activity of socializing is the set of experiences that is shared by the participants. Clearly, a person's experiences are generated, in part, by standard economic choices, and therefore the set of shared experiences in any social encounter is driven by the prior economic choices of individual participants. One implication is that these prior choices are not purely private since the utility that individual participants derive from a social encounter is linked to them. Our model of this link provides an explanation of a number of interesting phenomena, including certain sorts of conformity, the domination of one culture by another, and the existence of superstars.

Existence Advertising, Price Competition, and Asymmetric Market Structure

We examine a two stage duopoly game in which firms advertise their existence to consumers in stage 1 and compete in prices in stage 2. Whenever the advertising technology generates positive overlap in customer bases the equilib- rium for the stage 1 game is asymmetric in that one firm chooses to remain small in comparison to its competitor. For a specific random advertising technology we show that one firm will always be half as large as the other. No equilibrium in pure price strategies exists in the stage 2 game and as long as there is some overlap in customer bases the mixed strategy equilibrium is far from the Bertrand equilibrium.Existence advertising; price dispersion; Bertrand paradox; information; duopoly

Spam - solutions and their problems

We analyze the success of filtering as a solution to the spam problem when used alone or concurrently with sender and/or receiver pricing. We find that filters alone may exacerbate the spam problem if the spammer attempts to evade them by sending multiple variants of the message to each consumer. Sender and receiver prices can effectively reduce or eliminating spam, either on their own or when used together with filtering. Finally, we discuss the impli- cations for social welfare of using the different spam controls.Spam; filtering; email; receiver pricing; sender pricing

General Walter Krueger and Joint War Planning, 1922-1938

Joint operations, joint education, and joint war planning are nothing new for the Army and Navy, although there are those who apparently lose sight of the fact

Punitive Damages and the Processing of Tort Claims

Punitive damages are one of the most controversial aspects of tort litigation and have been the subject of various theoretical, empirical, and experimental studies. One criticism of punitive damages refers to the effect that they have on civil litigation processes. In particular, Polinsky (1997) argues that the uncertainty and unpredictability that punitive damage claims inject into a case may increase both the rate and amount of settlements, thus implying that punitive damages carry systemic consequences for the general processing of tort claims. This paper represents the first, empirical examination of this implication. With one of the largest and most comprehensive data sets of tort litigation (over 25,000 cases filed from 1994 through 1997 in several counties in Georgia), we examine the effect of the decision to seek punitive damages on several major decision points in the tort litigation process in a series of logit regression models. With extensive control variables for type of case, the presence or absence of caps on damages, and other potentially important variables, we find that seeking punitive damages has no statistically significant effect on most phases of the tort litigation process.Torts, Litigation, Punitive Damages, Settlement Rates

Stereoisomerism in pentaerythritol-bridged cyclotriphosphazene tri-spiranes: spiro and ansa 1,3-propanediyldioxy disubstituted derivatives

Four isomeric products were isolated and purified from the reaction of 1,3-propanediol with the tetra-spirane cyclophosphazene-organophosphate compound (1): viz. the di-monospiro (2a), di-monoansa (2b) and two monospiro-monoansa derivatives (2c) and (2d). It is shown by 31P NMR spectroscopy on addition of a chiral solvating agent (CSA) that both the di-monospiro (2a) and di-monoansa (2b) derivatives are racemates, as expected, whereas no splitting of NMR signals occurred on addition of CSA to solutions of (2c) and (2d). It is found by X-ray crystallography that the two monospiro-monoansa spirane derivatives, (2c) and (2d), are meso diastereoisomers, which represent a new case of the stereochemistry of bis di-substituted cyclophosphazene derivatives of (1). It is also observed from the 31P NMR spectrum of the reaction mixture, supported by the yields of pure compounds, that formation of a spiro group is about 4.5 times more likely than that of an ansa moiety under the conditions of the reaction