Old carbon contributes to aquatic emissions of carbon dioxide in the Amazon

Knowing the rate at which carbon is cycled is crucial to understanding the dynamics of carbon transfer pathways. Recent technical developments now support measurement of the <sup>14</sup>C age of evaded CO<sub>2</sub> from fluvial systems, which provides an important "fingerprint" of the source of C. Here we report the first direct measurements of the <sup>14</sup>C age of effluxed CO<sub>2</sub> from two small streams and two rivers within the western Amazonian Basin. The rate of degassing and hydrochemical controls on degassing are also considered. We observe that CO<sub>2</sub> efflux from all systems except for the seasonal small stream was <sup>14</sup>C -depleted relative to the contemporary atmosphere, indicating a contribution from "old" carbon fixed before ~ 1955 AD. Further, "old" CO<sub>2</sub> was effluxed from the perennial stream in the rainforest; this was unexpected as here connectivity with the contemporary C cycle is likely greatest. The effluxed gas represents all sources of CO<sub>2</sub> in the aquatic system and thus we used end-member analysis to identify the relative inputs of fossil, modern and intermediately aged C. The most likely solutions indicated a contribution from fossil carbon sources of between 3 and 9% which we interpret as being derived from carbonate weathering. This is significant as the currently observed intensification of weather has the potential to increase the future release of old carbon, which can be subsequently degassed to the atmosphere, and so renders older, slower C cycles faster. Thus <sup>14</sup>C fingerprinting of evaded CO<sub>2</sub> provides understanding which is essential to more accurately model the carbon cycle in the Amazon Basin

Identification of behaviour change techniques and engagement strategies to design a smartphone app to reduce alcohol consumption using a formal consensus method

Background: Digital interventions to reduce excessive alcohol consumption have the potential to have a broader reach and be more cost-effective than traditional brief interventions. However, there is not yet a strong evidence base on their ability to engage users or on their effectiveness. Objective: This study aimed to identify the behaviour change techniques (BCTs) and engagement strategies most worthy of further study by inclusion in a smartphone application (app) to reduce alcohol consumption, using formal expert consensus methods. Methods: The first phase of the study consisted of a Delphi exercise with three rounds. It was conducted with seven international experts in the field of alcohol and/or behaviour change. In the first round, experts identified BCTs most likely to be effective at reducing alcohol consumption and strategies most likely to engage users with an app; these were rated in the second round; and those rated as effective by at least four out of seven participants were ranked in the third round. The rankings were analysed using Kendall’s W coefficient of concordance, which indicates consensus between participants. The second phase consisted of a new, independent group of experts (n=43) ranking the BCTs that were identified in the first phase. The correlation between the rankings of the two groups was assessed using Spearman’s rank correlation coefficient. Results: Twelve BCTs were identified as likely to be effective. There was moderate agreement among the experts over their ranking (W=.465, χ2(11)=35.77, P<.001) and the BCTs receiving the highest mean rankings were self-monitoring, goal-setting, action planning, and feedback in relation to goals. There was a significant correlation between the ranking of the BCTs by the group of experts who identified them and a second independent group of experts (Spearman’s rho=.690, P=.01). Seventeen responses were generated for strategies likely to engage users. There was moderate agreement among experts on the ranking of these engagement strategies (W=.563, χ2(15)=59.16, P<.001) and those with the highest mean rankings were ease of use, design – aesthetic, feedback, function, design – ability to change design to suit own preferences, tailored information, and unique smartphone features. Conclusions: The BCTs with greatest potential to include in a smartphone app to reduce alcohol consumption were judged by experts to be self-monitoring, goal-setting, action planning, and feedback in relation to goals. The strategies most likely to engage users were ease of use, design, tailoring of design and information, and unique smartphone features

The Downhill Battle to Copyright Sonic Ideas in Bridgeport Music

This Note argues that the bright-line rule announced in Bridgeport Music should not apply where the disputed digital sample appropriates only the sonic ideas of the original work. The main thrust of this argument is that the Sixth Circuit\u27s holding in Bridgeport Music is inapplicable where the disputed copying is a protected exercise of fair use reverse engineering; that is, where copying is necessary to appropriate the sonic ideas embodied in the sampled work. Part II of this Note presents a brief history of digital sampling, including its application in the Hip-Hop musical genre. Part III presents a walkthrough of the Bridgeport Music decision, including its procedural history, the lower court\u27s decision, and the Sixth Circuit\u27s recent amendment of its own opinion. Part IV presents an analysis of Bridgeport Music, including reference to the recent eruption of academic and public reaction to the case. Part V sets aside the bulk of prior digital sampling scholarship to open a new front in the debate: the Electronica musical genre, the Downhill Battle protesters, and the innovative applications of digital sampling common to Electronica Music. Part VI argues that certain uses of digital sampling in Electronica composition are protectable acts of reverse engineering, and therefore immune from the Sixth Circuit\u27s Get a license or do not sample missive. Part VII concludes that, while the result in Bridgeport Music is probably justified, its moratorium on all unlicensed sampling is an improvident attempt to copyright uncopyrightable sonic ideas

Sector Agnosticism and the Coming Transformation of Education Law

Over the past two decades, the landscape of elementary and secondary education in the United States has shifted dramatically, due to the emergence and expansion of privately provided, but publicly funded, schooling options (including both charter schools and private school choice devices like vouchers, tax credits, and educational savings accounts). This transformation in the delivery of K12 education is the result of a confluence of factors-discussed in detail below-that increasingly lead education reformers to support efforts to increase the number of high quality schools serving disadvantaged students across all three educational sectors, instead of focusing exclusively on reforming urban public schools. As a result, millions of American children now attend privately operated, publicly funded schools. This rise in a sector agnostic education policy has profound implications for the state and federal constitutional law of education because it blurs the distinction between charter and private schools. This Article explores three of the most significant of these implications

Chemical abundances in spiral and irregular galaxies. O and N abundances derived from global emission--line spectra

The validity of oxygen and nitrogen abundances derived from the global emission-line spectra of galaxies via the P-method has been investigated using a collection of published spectra of individual HII regions in irregular and spiral galaxies. The conclusions of Kobulnicky, Kennicutt & Pizagno (1999) that global emission-line spectra can reliably indicate the chemical properties of galaxies has been confirmed. It has been shown that the comparison of the global spectrum of a galaxy with a collection of spectra of individual HII regions can be used to distinguish high and low metallicity objects and to estimate accurate chemical abundances in a galaxy. The oxygen and nitrogen abundances in samples of UV-selected and normal nearby galaxies have been determined. It has been found that the UV-selected galaxies occupy the same area in the N/O -- O/H diagram as individual HII regions in nearby galaxies. Finally, we show that intermediate-redshift galaxies systematically deviate from the metallicity -- luminosity trend of local galaxies.Comment: 15 pages, 17 figures, accepted for publication in Astronomy and Astrophysic

Trends in Concurrency, Polygyny, and Multiple Sex Partnerships During a Decade of Declining HIV Prevalence in Eastern Zimbabwe.

Background. Observed declines in the prevalence of human immunodeficiency virus (HIV) infection in Zimbabwe have been attributed to population-level reductions in sexual partnership numbers. However, it remains unknown whether certain types of sex partnerships were more important to this decline. Particular debate surrounds the epidemiologic importance of polygyny (the practice of having multiple wives). Methods. We analyze changes in reported multiple partnerships, nonmarital concurrency, and polygyny in eastern Zimbabwe during a period of declining HIV prevalence, from 1998 to 2011. Trends are reported for adult men (age, 17–54 years) and women (age, 15–49 years) from 5 survey rounds of the Manicaland HIV/STD Prevention Project, a general-population open cohort study. Results. At baseline, 34.2% of men reported multiple partnerships, 11.9% reported nonmarital concurrency, and 4.6% reported polygyny. Among women, 4.6% and 1.8% reported multiple partnerships and concurrency, respectively. All 3 partnership indicators declined by similar relative amounts (around 60%–70%) over the period. Polygyny accounted for around 25% of male concurrency. Compared with monogamously married men, polygynous men reported higher levels of subsequent divorce/separation (adjusted relative risk [RR], 2.92; 95% confidence interval [CI], 1.87–4.55) and casual sex partnerships (adjusted RR, 1.63; 95% CI, 1.41–1.88). Conclusions. No indicator clearly dominated declines in partnerships. Polygyny was surprisingly unstable and, in this population, should not be considered a safe form of concurrency

Más que enseñar el contenido: contribución a re-conceptualizando la identidad profesional del profesorado

In Zelman v. Simmons-Harris, the Supreme Court of the US ruled that the First Amendment’s Religion Clause, i.e. ‘Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof’, permits publicly funded school-voucher experiments that include private and religious schools. In other words, the Court made it clear—albeit by a narrow 5-4 margin—that governments do not unconstitutionally ‘establish[]’ religion merely by permitting eligible students to use publicly funded scholarships to attend qualifying religious schools, so long as the students’ parents are able to make a ‘true private choice’ for the school their children attend. However, the Zelman decision left unanswered and unresolved many questions and problems. The general rule announced and applied can be stated in straightforward fashion: A publicly funded voucher program that indirectly aids religious institutions must be ‘neutral with respect to religion’ in that it provides assistance ‘to a broad class of citizens defined without reference to religion’ who then ‘direct government aid to religious schools wholly as a result of their genuine and independent private choice.’ In practice, though, uncertainties remain. Though the constitutionality of school choice programs is, as a general matter anyway, settled under the federal Constitution, the constitutionality of individual programs at the state level is still at issue around the country. Bush v. Holmes is the latest legal fight in the broader movement within America to increase educational opportunity for the underprivileged through school voucher programs