Caution Ahead: Overdue Investments in New York's Aging Infrastructure

While Superstorm Sandy focused much-needed attention on key pieces of New York City's infrastructure, the city faces a number of other infrastructure vulnerabilities that have little to do with storm-preparedness -- from aging water mains and deteriorating roads to crumbling public schools. If left unchecked, they could wreak havoc on the city's economy and quality of life

The Apokatastasis Essays in Context: Leibniz and Thomas Burnet on the Kingdom of Grace and the Stoic/Platonic Revolutions

One of Leibniz’s more unusual philosophical projects is his presentation (in a series of unpublished drafts) of an argument for the conclusion that a time will necessarily come when “nothing would happen that had not happened before." Leibniz’s presentations of the argument for such a cyclical cosmology are all too brief, and his discussion of its implications is obscure. Moreover, the conclusion itself seems to be at odds with the main thrust of Leibniz’s own metaphysics. Despite this, we can discern a serious and important point to Leibniz’s consideration of the doctrine, namely in what it suggests about the proper boundary between metaphysics and theology, on the one hand, and ordinary history (whether human or natural), on the other. And we can get a better sense of Leibniz purpose in the essays by considering them in the context of Leibniz's response to Thomas Burnet's "Telluris theoria sacra" (1681-89). Leibniz praises Burnet's history of earth for presenting a harmony between the principles of nature and grace, a harmony absent in the cosmogonies of Descartes and the Newtonians. But Leibniz also complains that Burnet misconceives the boundary between natural explanation and reflections on divine wisdom. And Leibniz's essays on cyclical cosmology suggest the alternative to Burnet's account: a natural history of the earth and its inhabitants should be radically autonomous from, even if ultimately harmonious with, theological principles

Designing a Work-Friendly Tax System

[Excerpt] Taxes tend to influence individual choices between labor and leisure, and high effective marginal tax rates on earned income tend to discourage work. In particular, the empirical evidence shows that high effective marginal tax rates tend to discourage work by low- and moderate-income individuals, especially those that are trying to work their way out of the welfare system. Unfortunately, the current federal tax system often imposes its highest effective marginal tax rates on just those individuals. The purpose of this paper is to suggest some simple ways to reduce those high effective marginal tax rates. One approach would be to replace the current earned income tax credit with a $2,000 per worker credit and a refundable$1,000 per child tax credit. A more comprehensive approach would be to integrate the individual income tax and Social Security tax systems into a single, comprehensive income tax system with refundable $2,000 per worker earned income tax credits and with$1,000 or $2,000 per person refundable personal tax credits or demogrants. In short, this paper considers how to make the federal tax system more work-friendly for low- and moderate-income workers

The Rise and Fall of School Vouchers: A Story of Religion, Race, and Politics

This Article examines why school vouchers have failed to garner the support that so many assumed would follow the Court\u27s decision in Zelman. The explanation, I suggest, concerns religion, race, and politics. The original rationale for vouchers was what I call the values claim -vouchers protected the right of parents to send their child to a school that reinforced their values. Originally promoted by Catholics, the values claim was adopted by evangelical Christians concerned about the secularization of public schools after the 1960s. Although the values claim was central for most of the history of the voucher movement, in the decade leading up to Zelman, voucher advocates replaced the values claim with what I call the racial-justice claim. This rationale emphasized vouchers as part of a civil rights struggle to obtain academically rigorous private education for low-income and minority parents. Redefining vouchers in this manner had political and legal advantages, and paved the way for the Court\u27s decision in Zelman upholding vouchers. Since Zelman, however, two trends have emerged that spell trouble for the future of the voucher movement. First, there are tensions between the values and racial-justice claims for vouchers, as the two claims lead to very different types of voucher programs that appeal to divergent political constituencies. Second, the voucher movement has been hurt by the rise of the accountability movement in education. No Child Left Behind was enacted the same year that Zelman was decided, meaning that the Court gave the green light to the voucher movement at exactly the same time that state and national education policy began to demand greater oversight of all schools, including private schools accepting vouchers. For schools today, accountability means less local control, more tests, and stricter government standards. Conservative Christians, who once led the voucher movement, reject these intrusions into school autonomy. As a result, they are less likely to support modern voucher programs. My approach in this Article is historical, predictive, and normative. It is historical in that I trace the development of the values and racial-justice claims for school vouchers, exploring the tensions between the two claims. It is predictive because I suggest that the future of this educational reform is much less rosy than voucher supporters thought when Zelman was decided. Thus, I predict that Zelman may end up mattering much less than so many had thought it would. Finally, my approach is normative for I argue that it would be unfortunate if I am right about the demise of vouchers. While voucher defenders have vastly overstated the racial-justice claim, there is some prospect that vouchers might improve educational outcomes for low-income African American children. I argue that vouchers should be permitted at least until they can be more thoroughly evaluated to determine their impact on a group so in need of better educational opportunities

No Ordinary Success: The Boundaries of School Reform

How much can schools improve the life prospects of children growing up in poor neighborhoods? This question has divided the education community since at least the 1960s, when a group of researchers led by James Coleman attempted to quantify the extent to which segregation hurt black children. Coleman concluded that differences in family background had a greater impact on student achievement than did differences in school quality. Almost 40 years later, former New York Times education columnist Richard Rothstein revisited the question. In a series of lectures at Columbia University’s Teachers College that became the book Class and Schools (2004), Rothstein chronicled the ways in which out-of-school factors undermine low-income children. Poor kids arrive at school knowing fewer words; live in substandard (often lead-poisoned) housing; lack healthcare; spend afternoons, weekends, and summers in neighborhoods without decent parks or libraries; face discrimination in the workplace after they leave school; and so on. This part of Rothstein’s argument was not new to anyone familiar with the lives of poor children. But he made one additional claim that upset many educators. According to Rothstein, the challenges facing low-income students meant that they would always do worse, on average, than their higher-income peers. I devoured Class and Schools when it came out; it seemed an urgent call for our nation to address out-of-school factors holding poor children back. Others saw (and see) Rothstein as defeatist, apologizing for school failure and telling inner-city teachers and kids that they will never beat the odds. The argument erupted again last year when two groups of education reformers set out what were widely seen as competing agendas. The Education Equality Project—led by New York City schools Chancellor Joel Klein, Washington, D.C. schools Chancellor Michelle Rhee, and minister-activist Al Sharpton—emphasized school accountability, tough standards, and changes in how teachers are hired, fired, and paid. The other group, formed by the Economic Policy Institute (Rothstein’s home), called for a “Broader, Bolder Approach,” insisting that schools alone cannot be expected to successfully educate poor students. Schools need help, they said, in the form of expanded health care, afterschool and summer programs, quality early childhood initiatives, and the like. Although the rhetoric from the two camps does not always reflect it, the gap between them is narrowing. Two important new books on schools suggest it should narrow further still

Surface studies of thermionic cathodes and the mechanism of operation of an impregnated tungsten cathode

The surface properties of conventional impregnated cathodes were investigated by the use of Auger spectroscopy and work function measurements, and these were compared with a synthesized barium or barium oxide coated tungsten surface. The barium and barium oxide coated surfaces were prepared by evaporating barium onto a tungsten surface that can be heated to elevated temperatures. Multilayer or monolayer coverages can be investigated using this technique. The results of this study show that the surface of an impregnated tungsten cathode is identical to that observed for a synthesized monolayer or partial monolayer of barium on partially oxidized tungsten, using the criteria of identical Auger patterns and work functions. Desorption measurements of barium from a tungsten surface were also made. These results in conjunction with Auger and work function data were interpreted to show that throughout most of its life an impregnated cathode operating in the range of 1100 C has a partial monolayer rather than a monolayer of barium on its surface

The 'equilibrium' anisotropy in the flux of 10 MeV solar flare particles and their convection in the solar wind

Equilibrium anisotropy in flux solar flare particles calculated from particle spectra and solar wind speed

Interpolation algorithms and image data artifacts

Interpolation, or resampling coefficients, which are generated from low pass filter Fourier transforms yield more accurate resampled values than those obtained using cubic spline techniques. This is due to the utilization of six data points rather than four as currently used in cubic spline analysis. After resampling functions are applied to image data, artifacts which are similar to ringing may become pronounced. These effects are often present in the original data and the interpolation merely enhances them

Bayesian inference for stochastic differential equation mixed effects models of a tumor xenography study

We consider Bayesian inference for stochastic differential equation mixed effects models (SDEMEMs) exemplifying tumor response to treatment and regrowth in mice. We produce an extensive study on how a SDEMEM can be fitted using both exact inference based on pseudo-marginal MCMC and approximate inference via Bayesian synthetic likelihoods (BSL). We investigate a two-compartments SDEMEM, these corresponding to the fractions of tumor cells killed by and survived to a treatment, respectively. Case study data considers a tumor xenography study with two treatment groups and one control, each containing 5-8 mice. Results from the case study and from simulations indicate that the SDEMEM is able to reproduce the observed growth patterns and that BSL is a robust tool for inference in SDEMEMs. Finally, we compare the fit of the SDEMEM to a similar ordinary differential equation model. Due to small sample sizes, strong prior information is needed to identify all model parameters in the SDEMEM and it cannot be determined which of the two models is the better in terms of predicting tumor growth curves. In a simulation study we find that with a sample of 17 mice per group BSL is able to identify all model parameters and distinguish treatment groups.Comment: Minor revision: posterior predictive checks for BSL have ben updated (both theory and results). Code on GitHub has ben revised accordingl