Power calculation for gravitational radiation: oversimplification and the importance of time scale

A simplified formula for gravitational-radiation power is examined. It is shown to give completely erroneous answers in three situations, making it useless even for rough estimates. It is emphasized that short timescales, as well as fast speeds, make classical approximations to relativistic calculations untenable.Comment: Three pages, no figures, accepted for publication in Astronomische Nachrichte

A ‘Non-Power’ Looks at Separation of Powers

On April 6, 1989, Dean, Alan B. Morrison of George Washington Law, delivered the Georgetown Law Center’s ninth Annual Philip A. Hart Memorial Lecture: A ‘Non-Power’ Looks at Separation of Powers. Dean Morrison is the Lerner Family Associate Dean for Public Interest & Public Service at GW Law. He is responsible for creating pro bono opportunities for students, bringing a wide range of public interest programs to the law school, encouraging students to seek positions in the non-profit and government sectors, and assisting students find ways to fund their legal education to make it possible for them to pursue careers outside of traditional law firms. For most of his career, Dean Morrison worked for the Public Citizen Litigation Group, which he co-founded with Ralph Nader in 1972 and directed for over 25 years. His work involved law reform litigation in various areas including: open government, opening up the legal profession, suing agencies that fail to comply with the law, enforcing principles of separation of powers, protecting the rights of consumers, and protecting unrepresented class members in class action settlements. He has argued 20 cases in the Supreme Court, including victories in Goldfarb v. Virginia State Bar (holding lawyers subject to the antitrust laws for using minimum fee schedules); Virginia State Board of Pharmacy v. Virginia Citizens Consumer Council (making commercial speech subject to the First Amendment); and INS v. Chadha (striking down over 200 federal laws containing the legislative veto as a violation of separation of powers). He currently teaches civil procedure and election law, and previously taught at Harvard, NYU, Stanford, Hawaii, and American University law schools. He is a member of the American Academy of Appellate Lawyers and was its president in 1999–2000. Among other positions, he served as an elected member of the Board of Governors of the District of Columbia Bar, a member and then senior fellow of the Administrative Conference of the United States, a member of the American Law Institute, and a member of the Committee on Science, Technology & Law of the National Academy of Science. He is a graduate of Yale University and Harvard Law School, served as a commissioned officer in the US Navy, and was an assistant U.S. attorney in New York

GERT simulation program for GERT network analysis

GERT Simulation Program simulates GERT networks to obtain statistics on specified nodes of the network. It performs sampling experiments to determine which branches of the network are taken and how long it takes to traverse a branch of the network

Workers' Compensation Insurance and the Duration of Workplace Injuries

This paper uses a new administrative micro-data set to examine the effect of a legislated increase in the minimum and maximum workers' compensation benefit on the duration of workplace injuries in Minnesota. As a result of legislation, workers in some earnings groups received higher benefits if they were injured after the effective date of the benefit increase, while workers in other earnings groups received the same benefit regardless of when they were injured. The analysis compares the change in mean log injury duration for workers who were affected by the benefit increase to that of workers who were not affected by the benefit increase. The findings indicate that the duration of injuries increased by 8 percent more for the group of workers that experienced a 5 percent increase in benefits than for the group of workers that had no change in their benefit. Additional findings suggest that employees of self-insured firms who are injured on the job tend to return to work faster than employees of imperfectly experience rated firms who incur similar injuries.

Do Markets Respond More to More Reliable Labor Market Data? A Test of Market Rationality

Since 1979, the Bureau of Labor Statistics (BLS) has nearly quadrupled the size of the sample used to estimate monthly employment changes. Although first-reported employment estimates are still noisy, the magnitude of sampling variability has declined in proportion to the increase in the sample size. A model of rational Bayesian updating predicts that investors would assign more weight to the BLS employment survey as it became more precise. However, a regression analysis of changes in interest rates on the day the employment data are released finds no evidence that the bond market's reaction to employment news intensified in the late 1980s or early 1990s. For the time period as a whole, an unexpected increase of 200,000 jobs is associated with an 8 basis point increase in the interest rate on 30 year Treasury bonds, and a 9 basis point increase in the interest rate on 3 month bills, all else equal. Additionally, announced hourly wage increases are associated with higher long-term interest rates rate and revisions to past months' employment estimates have a statistically insignificant effect on long-term interest rates.