Effects of carbon incorporation on doping state of YBa2Cu3Oy

Effects of carbon incorporation on the doping state of YBa2Cu3Oy (Y-123) were investigated. Quantitative carbon analysis revealed that carbon could be introduced into Y-123 from both the precursor and the sintering gas. Nearly carbon-free (< 200 ppm) samples were prepared from a vacuum-treated precursor by sintered at 900 &#730;C and cooling with 20 &#730;C /min in flowing oxygen gas. The lower Tc (= 88 K) and higher oxygen content (y = 6.98) strongly suggested the overdoping state, which was supported by the temperature dependence of resisitivity and thermoelectric power. The nuclear quadrapole resonance spectra and the Raman scattering spectra indicated that there was almost no oxygen defect in the Cu-O chain in these samples. On the other hand, in the same cooling condition, the samples sintered in air stayed at optimal doping level with Tc = 93 K, and the intentionally carbon-doped sample was in the underdoping state. It is revealed that about 60% of incorporated carbon was substituted for Cu at the chain site in the form of CO32+, and the rest remains at the grain boundary as carbonate impurities. Such incorporation affected the oxygen absorption process in Y-123. It turned out that the oxygen content in Y-123 cannot be controlled only by the annealing temperature and the oxygen partial pressure but also by the incorporated carbon concentration.Comment: 16pages, 9figure

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There is substantial interest in the extent to which published findings in social-behavioral sciences are reproducible and whether it is possible to predict the likelihood of reproducing. Large-scale replication and prediction market projects in some subfields — particularly parts of psychology and economics — have provided initial evidence that reproducibility may be lower than expected or desired, and that surveys of experts and prediction markets may be effective at predicting reproducible findings. There is still much to learn about reproducibility across business, economics, education, political science, psychology, sociology, and other areas of social-behavioral sciences. In order to better assess and predict replicability of social-behavioral science findings, the Center for Open Science in partnership with Defense Advanced Research Projects Agency (DARPA) is working to help advance this understanding

SCORE

There is substantial interest in the extent to which published findings in social-behavioral sciences are reproducible and whether it is possible to predict the likelihood of reproducing. Large-scale replication and prediction market projects in some subfields — particularly parts of psychology and economics — have provided initial evidence that reproducibility may be lower than expected or desired, and that surveys of experts and prediction markets may be effective at predicting reproducible findings. There is still much to learn about reproducibility across business, economics, education, political science, psychology, sociology, and other areas of social-behavioral sciences. In order to better assess and predict replicability of social-behavioral science findings, the Center for Open Science in partnership with Defense Advanced Research Projects Agency (DARPA) is working to help advance this understanding

Josh Matacotta's Quick Files

The Quick Files feature was discontinued and it’s files were migrated into this Project on March 11, 2022. The file URL’s will still resolve properly, and the Quick Files logs are available in the Project’s Recent Activity

Josh Matacotta's Quick Files

The Quick Files feature was discontinued and it’s files were migrated into this Project on March 11, 2022. The file URL’s will still resolve properly, and the Quick Files logs are available in the Project’s Recent Activity

Mental health concerns of undergraduate and graduate students: Depression, anxiety, eating concerns, and substance misuse

This study investigated mental health concerns reported by undergraduate and graduate college students attending a public university. The sample consisted of 1,451 students (Mage=23.6 years) seeking campus-based counseling services. The results show that depression, anxiety, eating concerns, and substance misuse are the most cited mental health concerns impacting academics and overall wellbeing. Data reveal other factors contributing to mental health concerns in the college population. These include a history of self-harm behaviors or suicide, past experiences of trauma, and uncertainty about or delay in accessing supportive services.</p