The Value of Scarce Water: Measuring the Inefficiency of Municipal Regulations

Rather than allowing water prices to reflect scarcity rents during periods of drought-induced excess demand, policy makers have mandated command-and-control approaches, like the curtailment of certain uses, primarily outdoor watering. Using unique panel data on residential end-uses of water, we examine the welfare implications of typical drought policies. Using price variation across and within markets, we identify end-use specific price elasticities. Our results suggest that current policies target water uses that households, themselves, are most willing to forgo. Nevertheless, we find that use restrictions have costly welfare implications, primarily due to household heterogeneity in willingness-to-pay for scarce water.

The Value of Scarce Water: Measuring the Inefficiency of Municipal Regulations

Rather than allowing water prices to reflect scarcity rents during periods of drought-induced excess demand, policy makers have mandated command-and-control approaches, like the curtailment of certain uses, primarily outdoor watering. Using unique panel data on residential end-uses of water, we examine the welfare implications of typical drought policies. Using price variation across and within markets, we identify end-use specific price elasticities. Our results suggest that current policies target water uses that households, themselves, are most willing to forgo. Nevertheless, we find that use restrictions have costly welfare implications, primarily due to household heterogeneity in willingness-to-pay for scarce water.

Cavity Coupled Aeroramp Injector Combustion Study

The difficulties with fueling of supersonic combustion ramjet engines with hydrocarbon based fuels presents many challenges that are currently being tackled by the Air Force Research Lab Propulsion Directorate Aerospace Propulsion Division. As the scramjet engine designs are scaled up, the need for a better solution to supersonic mixing has led to the development of many different styles of fuel injection. An aerodynamic ramp injector has been shown to have a quantitative improvement over a physical ramp while still achieving desirable mixing characteristics. The objectives for this research was quantifying the performance and operability implications of replacing four 15 degree round injectors with four arrays of improved aeroramp injectors. Ignition limits and pre-combustion shock position were used to define the operability differences while combustion efficiency was the primary metric used for performance comparisons. Performance and operability data was derived from data taken determining the ignition limits, the wall static pressures, temperature measurements, and thrust stand loading. It was determined that the operability reduces significantly for the aeroramp injector, but the performance is virtually identical to the round injectors. The aeroramp injector indicated improved near-field combustion indicating the potential for better performance in higher Mach number flow to include full scramjet mode

Aves, Apodiformes, Trochilidae, <i>Topaza pella</i> (Linnaeus, 1758): A range reinforcement in Amazonian Brazil.

We present new distribution records for Topaza pella (Linnaeus, 1758) in the southern reaches of the AmazonBasin in Brazil. The two new localities presented for the species elucidate its range in southern Pará and northern MatoGrosso states, and in consideration of recent records elsewhere south of the Amazon River, suggest that the species is widelydistributed across suitable habitat throughout the Brazilian Amazon

A phylogenetic framework for evolutionary study of the nightshades (Solanaceae): a dated 1000-tip tree

© Särkinen et al.; licensee BioMed Central Ltd. 2013 This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The attached file is the published version of the article

Increased risk of depression in non-depressed HIV infected men with sleep disturbance: Prospective findings from the Multicenter AIDS Cohort Study.

ObjectiveSleep disturbance is a known risk factor for depression, but it is not known whether sleep disturbance contributes to greater risk of depression in those infected with human immunodeficiency virus (HIV+) as compared to those uninfected with HIV (HIV-).MethodsUsing data from the Multicenter AIDS Cohort Study, a population-based prospective study of men who have sex with men (MSM), self-reported sleep disturbance (&gt;2 weeks) and depressive symptoms (Clinical Epidemiologic Scale for Depression, CES-D) were assessed every 6 months over 12 years of follow-up. Adjusted mixed effects logistic regression analyses tested whether sleep disturbance predicted depression (CES-D ≥ 16) at the immediate subsequent visit, and so on over 12 years, in non-depressed HIV+(N = 1054; 9556 person-visits) and non-depressed HIV- (N = 1217; 12,680 person-visits). In HIV+ vs. HIV- MSM, linearly estimated average incidence of depression and normalized cumulative rate of depression over 12 years were compared.ResultsIn the HIV+ MSM, sleep disturbance was associated with a significant increase in depression 6 months later (OR = 1.6; 95% CI, 1.30, 1.96), which was significantly greater (P &lt; .05) than in HIV- MSM (OR = 1.16; 95% CI, 0.94, 1.44). HIV status and sleep disturbance interacted (P &lt; .001), such that incidence of depression and normalized cumulative rate of depression were greater in HIV+ with sleep disturbance than in HIV+ without sleep disturbance and HIV- groups (all P's &lt; 0.001).ConclusionsHIV+ persons who report sleep disturbance represent a high risk group to be monitored for depression, and possibly targeted for insomnia treatment to prevent depression. FUND: National Institute of Allergy and Infectious Diseases

Empathy Throughout the Curriculum: Using Picture Books to Promote Activism & Equity

The authors—a panel of teacher educators, an education librarian, and a high school student activist, share classroom practices, recent research, and scholarship that centers on fostering empathy and activism through picture books as part of culturally relevant-sustaining practices. A variety of new children’s literature and practical ways to incorporate these inclusive picture books across the curriculum are shared. Useful strategies for teachers to locate culturally responsive & sustaining children’s literature and related resources for classroom use are also provided

Re-envisioning Teacher Education: Using DisCrit Perspectives to Disrupt Deficit Thinking

This paper suggests that teacher educators engage in research that investigates practices and curriculum to consider how they might best confront issues of equity and deficit thinking in individual courses and disciplines. Rooted in the tenets of culturally responsive teaching and culturally sustaining pedagogy, the authors explore how DisCrit theory further informs understandings of hegemonic schooling practices, imploring faculty to upset the implicitly biased narratives that are so often reproduced in teacher education