Spectral triples for hyperbolic dynamical systems

Spectral triples are defined for C*-algebras associated with hyperbolic dynamical systems known as Smale spaces. The spectral dimension of one of these spectral triples is shown to recover the topological entropy of the Smale space

Sinking SCHIP: A First Step toward Stopping the Growth of Government Health Programs

Federal lawmakers are considering legislation that could result in millions more middle income families obtaining health insurance from government. Unfortunately, the debate over expansion of the State Children's Health Insurance Program is divorced from the reality of who truly needs assistance and the forces that are making health insurance increasingly unaffordable. SCHIP and its larger sibling Medicaid currently enroll many people who do not need government assistance, including some families of four earning up to $72,000 per year. That is a direct result of federal funding rules that reward states for making more Americans dependent on government for their health care. Rather than expand SCHIP, Congress should (1) make private health insurance more affordable by allowing consumers and employers to purchase less expensive policies from other states, and (2) fold federal Medicaid and SCHIP funding into block grants that no longer encourage states to open taxpayer-financed health care to nonneedy families. With more Americans able to afford private insurance and no incentive for states to expand government programs beyond the truly needy, federal and state governments could reduce spending on those programs

Classroom games in economics : a quantitative assessment of the 'beer game'

Using an experiment, I compare the use of the 'Beer Distribution' classroom game with the more traditional 'chalk and talk' approach to teach students about inventories and the macroeconomy. My empirical results confirm and extend our understanding of the relative strengths and weaknesses of the use of classroom games: the game tends to improve interest and motivation on average, though some students dislike their use; the game is effective at driving home its key messages, but it may wrongly lead students to disregard other important factors; the game is inferior where facts mastery or de nitional learning is required. Rather than an endorsement or a criticism of classroom games, the conclusion is cautionary advice on how to best make use of games within an overall course

Whacking Unarmed Women: Gaps in the Law of Armed Conflict

In recent years, legal commentators have begun to write on women in war: usually as the civilian victims of belligerent forces, sometimes as military victims of discrimination within their own armed forces. Very little has been written about women as belligerents. What has been written does not focus on the legal problems conventional forces face when women are unprivileged belligerents \u27 who fail to comply with law of war requirements for combatant status. These problems can become acute when conventional forces are engaged in Small Wars where unarmed women often serve as auxiliaries to their unconventional opponents. Although legal sources have been remarkably silent about these problems, a number of examples are available. I have selected two involving unarmed women: one from Northern Ireland involving the British Army, and one from Somalia involving the American Army

Does Barack Obama Support Socialized Medicine?

Democratic presidential nominee Sen. Barack Obama (IL) has proposed an ambitious plan to restructure America's health care sector. Rather than engage in a detailed critique of Obama's health care plan, many critics prefer to label it "socialized medicine." Is that a fair description of the Obama plan and similar plans? Over the past year, prominent media outlets and respectable think tanks have investigated that question and come to a unanimous answer: no. Those investigations leave much to be desired. Indeed, they are little more than attempts to convince the public that policies generally considered socialist really aren't. A reasonable definition of socialized medicine is possible. Socialized medicine exists to the extent that government controls medical resources and socializes the costs. Notice that under this definition, it is irrelevant whether we describe medical resources (e.g., hospitals, employees) as "public" or "private." What matters-what determines real as opposed to nominal ownership-is who controls the resources. By that definition, America's health sector is already more than half socialized, and Obama's health care plan would socialize medicine even further. Reasonable people can disagree over whether Obama's health plan would be good or bad. But to suggest that it is not a step toward socialized medicine is absurd

Dr. John H. Gibbon, Jr. and Jefferson\u27s Heart-Lung Machine: Commemoration of the World\u27s First Successful Bypass Surgery

On May 6, 1953 at Jefferson Medical College Hospital, Dr. John Heysham Gibbon, Jr., his staff, and with the help of his latest-designed heart-lung machine, “Model II,” closed a very serious septal defect between the upper chambers of the heart of eighteen-year-old Cecelia Bavolek. This was the first successful intercardiac surgery of its kind performed on a human patient. Ms. Bavolek was connected to the device for three-quarters of an hour and for 26 crucial minutes, the patient totally depended upon the machine’s artificial cardiac and respiratory functions. “Jack” Gibbon did not follow this epoch-making event by holding an international press conference or by swiftly publishing his achievements in a major medical journal. In fact he later recalled that it was the first and only time that he did not write his own operative notes (which were supplied by Dr. Robert K. Finley, Jr.). According to a recent biographical review by C. Rollins Hanlon, “Therein lies a hint of the complex, unassuming personality behind the magnificent technical and surgical achievement of this patrician Philadelphia surgeon.”https://jdc.jefferson.edu/jeffhistoryposters/1000/thumbnail.jp

A Better Way to Generate and Use Comparative-Effectiveness Research

President Barack Obama, former U.S. Senate majority leader Tom Daschle, and others propose a new government agency that would evaluate the relative effectiveness of medical treatments. The need for "comparative-effectiveness research" is great. Evidence suggests Americans spend $700 billion annually on medical care that provides no value. Yet patients, providers, and purchasers typically lack the necessary information to distinguish between high- and low-value services. Advocates of such an agency argue that comparative- effectiveness information has characteristics of a "public good," therefore markets will not generate the efficiency-maximizing quantity. While that is correct, economic theory does not conclude that government should provide comparative-effectiveness research, nor that government provision would increase social welfare. Conservatives warn that a federal comparative- effectiveness agency would lead to government rationing of medical care -- indeed, that's the whole idea. If history is any guide, the more likely outcome is that the agency would be completely ineffective: political pressure from the industry will prevent the agency from conducting useful research and prevent purchasers from using such research to eliminate low-value care. The current lack of comparative-effectiveness research is due more to government failure than to market failure. Federal tax and entitlement policies reduce consumer demand for such research. Those policies, as well as state licensing of health insurance and medical professionals, inhibit the types of health plans best equipped to generate comparative-effectiveness information. A better way to generate comparative-effectiveness information would be for Congress to eliminate government activities that suppress private production. Congress should let workers and Medicare enrollees control the money that purchases their health insurance. Further, Congress should require states to recognize other states' licenses for medical professionals and insurance products. That laissez-faire approach would both increase comparative-effectiveness research and increase the likelihood that patients and providers would use it