Air Quality and Asthma Hospitalization: Evidence of PM2.5 Concentrations in Pennsylvania Counties

According to the World Health Organization, 235 million people around the world currently suffer from asthma, which includes approximately 25 million in the United States. There is substantial epidemiological evidence indicating linkages between outdoor air pollution and asthma symptoms, more specifically between concentrations of particulate matter and asthma. Using county level data for 2001-2014, a spatial panel framework is imposed based upon prevailing wind patterns to investigate the direct and indirect impacts of PM2.5 concentration levels on asthma hospitalization in Pennsylvania. This model controls for population density, precipitation, smoking rate, and population demographic variables. Results show that PM2.5 concentrations as measured at the county level have positive direct and indirect effects on asthma hospitalization. A one-unit increase in PM2.5 in one Pennsylvania county will add, on average $1.29M ($754,656 direct and $539,040 indirect) to total annual asthma hospitalization costs with the state of Pennsylvania. This study highlights the need for realistic and accurate impact analyses of ambient air pollution on asthma that reflects the impacts on neighboring regions as well. In order to capture the spillover effects of health- related impacts from PM2.5 pollution, a wind direction algorithm to identify appropriate neighbors is important

Charges for Water and Access: What Explains the Differences in West Virginia Municipalities?

Applying linear and log-log functional forms plus spatial econometric analyses to a dataset of 125 municipal water utilities, we investigate the determinants of charges for water use and minimum monthly access to water across West Virginia municipalities in 2014. Water charges models are consistent with the theory of water cost determination as water source, debt, and economies of size plus scale influence what household consumers pay for water. Based on model results, groundwater use by utilities lowers water charges and is estimated to save household customers in West Virginia over $3.6 million annually. West Virginia households typically pay far below the OECD standard of 3 to 5% of household income for municipal water, which may explain why socioeconomic factors do not influence minimum charges for access

Drinking Water Quality Impacts on Health Care Expenditures in the United States

This paper explores the relationship between episodes of contaminated drinking water and health care expenditures in the United States. The analysis relies on panel data from the 48 contiguous states from 2000 to 2011. We use the population served by public water systems that violate health-based standards of the Safe Drinking Water Act as a proxy for contaminated drinking water. We estimate spatial and non-spatial models and control for factors that may affect per capita health care expenditures including variables that reflect air quality violations along with ability to pay plus demand for and supply of health care services. The results from a Spatial Durbin Model indicate that a 1% decrease in the percentage of population exposed to drinking water quality violations is associated with reductions in in-state and regional effects equal to 0.005% ($0.32) and 0.035$2.26) of per capita health care expenditures, respectively. Drinking water violations have a larger impact on expenditures than air quality violations (whose effects are not statistically different from zero). However, compared to other factors, such as Medicare enrollment and income, the impact of these violations on health care expenditures is relatively small. We find that regional health care expenditure impacts from drinking water violations are substantially greater than in-state impacts. Thus, a regional approach is recommended to addressing drinking water quality improvements

The Impact of Naloxone Access Laws on Opioid Overdose Deaths in the U.S.

Opioid overdose is the leading cause of unintentional death in the U.S. Narcan TM (Naloxone) is a prescription medicine that can reverse overdose effects. This research investigates the effect of Naloxone access laws on overdose death rates using state and temporal variation in the enactment of these laws. We also explore possible spillover effects between Naloxone access laws and overdose death rates across states. Our analyses reveal that when broken down by access law provisions, there exists a mixture of positive and negative effects on overdose death rates depending upon the provision. The results indicate that Naloxone access provisions have regional impacts by influencing overdose death rates within the state enacted and have a spillover effect in neighboring states. The magnitude of spillover effects is larger than direct effects in the states. Looking across multiple provisions, our findings provide no statistical evidence that these laws reduce opioid death rates

The exterior degree of a pair of finite groups

The exterior degree of a pair of finite groups $(G,N)$, which is a generalization of the exterior degree of finite groups, is the probability for two elements $(g,n)$ in $(G,N)$ such that $g\wedge n=1$. In the present paper, we state some relations between this concept and the relative commutatively degree, capability and the Schur multiplier of a pair of groups.Comment: To appear in Mediterr. J. Mat

Investigating Misophonia: A Review of the Empirical Literature, Clinical Implications, and a Research Agenda

Misophonia is a neurobehavioral syndrome phenotypically characterized by heightened autonomic nervous system arousal and negative emotional reactivity (e. g., irritation, anger, anxiety) in response to a decreased tolerance for specific sounds. The aims of this review are to (a) characterize the current state of the field of research on misophonia, (b) highlight what can be inferred from the small research literature to inform treatment of individuals with misophonia, and (c) outline an agenda for research on this topic. We extend previous reviews on this topic by critically reviewing the research investigating mechanisms of misophonia and differences between misophonia and other conditions. In addition, we integrate this small but growing literature with basic and applied research from other literatures in a cross-disciplinary manner

Broadband photonic crystal antireflection

Broadband antireflection layer have been fabricated by two dimensional (2D) photonic crystals (PCs) with tapered pillars on Si substrate. These PCs have been produced by interference lithography and reactive ion etching (RIE) techniques. The effect of depth and filling factor (FF) of the PCs on the reflectance magnitude and bandwidth has been investigated. The obtained reflectance was less than 1% in the broad spectral range from 400 to 2100 nm. Our numerically simulation shows the PC pillars slope has essential effect in the reduction of the reflection. However, our results show that the existence of RIE grasses in the PCs which are created in the RIE process have not been influenced in the performance of the antireflection layer which leads to simpler fabrication process