Evaluation of methods of reducing community noise impact around San Jose municipal airport

A computer simulation of the airport noise impact on the surrounding communities was used to evaluate alternate operational procedures, improved technology, and land use conversion as methods of reducing community noise impact in the airport vicinity. In addition, a constant density population distribution was analyzed for possible application to other airport communities with fairly uniform population densities and similar aircraft operational patterns. The introduction of sound absorption material (SAM) was found to reduce community noise annoyance by over 25 percent, and the introduction of refan was found to reduce community annoyance by over 60 percent. Replacing the present aircraft was found to reduce the noise problem to very small proportions, and the introduction of an advanced technology twin was found to essentially eliminate the community noise problem

Consequence, Weapons of Mass Destruction, and the Fourth Amendment\u27s No-Win Scenario

This article looks at consequence, with a particular focus on the threatened use of a WMD, to begin a discussion on a new doctrinal solution to the hypothetical. As background, Part I takes a look at cardinal Fourth Amendment principles and rules, as well as the many exceptions to the warrant, probable cause and particularity requirements that the Supreme Court has recognized. Part I also discusses minimization, a well-established privacy enhancing mechanism that normally serves as a back-end check on the government’s conduct, to determine whether it can serve as a front-end substitute for the Fourth Amendment’s particularity requirement. Based on publicly available information, Part II briefly explores the differences between chemical, biological, radiological, and nuclear WMDs, and the different consequences that can be reasonably anticipated from their respective use. Identifying these differences is critical to understanding how the significant definitional issues identified in Part III might affect the implementation of any new doctrinal solution. Part IV then looks at these issues through what I have elsewhere described as the “Fourth Amendment’s protective lens” and proposes that we use a probability-consequence matrix as an analytical framework to solve the “no-win” scenario. Finally, Part V seeks to lay out a path forward so that the Congress can consider and enact sensible legislation that will enable us to identify the limited circumstances in which consequence should be considered a factor in a Fourth Amendment calculus, particularly when a terrorist threatens to use a WMD

Do mayors run for higher office? New evidence on progressive ambition

The mayor’s office potentially offers a launchpad for statewide and national political ambitions. We know relatively little, however, about how frequently mayors actually run for higher office, and which mayors choose to do so. This article combines longitudinal data on the career paths of the mayors of 200 big cities with new survey and interview data to investigate these questions. While we find that individual and city traits—especially gender—have some predictive power, the overwhelming story is that relatively few mayors—just under one-fifth—ever seek higher office. We suggest that ideological, institutional, and electoral factors all help to explain why so few mayors exhibit progressive ambition

Fatty acid composition of Neurospora plasma membrane

Fatty acid composition of Neurospora plasma membran

Incorporation and degradation of lignoceric acid in cel

Incorporation and degradation of lignoceric acid in ce

Investigating the effect of characteristic x-rays in cadmium zinc telluride detectors under breast computerized tomography operating conditions

A number of research groups have been investigating the use of dedicated breast computerized tomography (CT). Preliminary results have been encouraging, suggesting an improved visualization of masses on breast CT as compared to conventional mammography. Nonetheless, there are many challenges to overcome before breast CT can become a routine clinical reality. One potential improvement over current breast CT prototypes would be the use of photon counting detectors with cadmium zinc telluride (CZT) (or CdTe) semiconductor material. These detectors can operate at room temperature and provide high detection efficiency and the capability of multi-energy imaging; however, one factor in particular that limits image quality is the emission of characteristic x-rays. In this study, the degradative effects of characteristic x-rays are examined when using a CZT detector under breast CT operating conditions. Monte Carlo simulation software was used to evaluate the effect of characteristic x-rays and the detector element size on spatial and spectral resolution for a CZT detector used under breast CT operating conditions. In particular, lower kVp spectra and thinner CZT thicknesses were studied than that typically used with CZT based conventional CT detectors. In addition, the effect of characteristic x-rays on the accuracy of material decomposition in spectral CT imaging was explored. It was observed that when imaging with 50-60 kVp spectra, the x-ray transmission through CZT was very low for all detector thicknesses studied (0.5-3.0 mm), thus retaining dose efficiency. As expected, characteristic x-ray escape from the detector element of x-ray interaction increased with decreasing detector element size, approaching a 50% escape fraction for a 100 mum size detector element. The detector point spread function was observed to have only minor degradation with detector element size greater than 200 mum and lower kV settings. Characteristic x-rays produced increasing distortion in the spectral response with decreasing detector element size. If not corrected for, this caused a large bias in estimating tissue density parameters for material decomposition. It was also observed that degradation of the spectral response due to characteristic x-rays caused worsening precision in the estimation of tissue density parameters. It was observed that characteristic x-rays do cause some degradation in the spatial and spectral resolution of thin CZT detectors operating under breast CT conditions. These degradations should be manageable with careful selection of the detector element size. Even with the observed spectral distortion from characteristic x-rays, it is still possible to correctly estimate tissue parameters for material decomposition using spectral CT if accurate modeling is used

Is the Reality Criterion Analytic?

Tim Maudlin has claimed that EPR’s Reality Criterion is analytically true. We argue that it is not. Moreover, one may be a subjectivist about quantum probabilities without giving up on objective physical reality. Thus, would-be detractors must reject QBism and other epistemic approaches to quantum theory on other grounds