Research and development program for a combined carbon dioxide removal and reduction system. Supplement 1, phase 2a - Physicochemical properties of lithium chloride lithium carbonate melt mixtures

Physiochemical properties of liquid mixtures of lithium chloride and lithium carbonat

Exact bounds on the ground-state energy of the infinite-U Hubbard model

We give upper and lower bounds for the ground-state energy of the infinite-U Hubbard model. In two dimensions, using these bounds we are able to rule out the possibility of phase separation between the undoped-insulating state and an hole-rich state.Comment: 2 pages, 1 figure, to appear in Phys. Rev.

Non-destructive distinction between geogenic and anthropogenic calcite by Raman spectroscopy combined with machine learning workflow

Here, we demonstrate, for the first time, the possibility of distinguishing between geogenic and anthropogenic calcite in a non-destructive and effective way. Geogenic calcite derives from natural sedimentary and metamorphic rocks whereas anthropogenic calcite is formed artificially due to the carbonation process in mortars and plaster lime binders. Currently, their distinction is a major unaddressed issue although it is crucial across several fields such as 14C dating of historical mortars to avoid contamination with carbonate aggregates, investigating the origins of pigments, and studying the origins of sediments, to name a few. In this paper, we address this unmet need combining high-resolution micro-Raman spectroscopy with data mining and machine learning methods. This approach provides an effective means of obtaining robust and representative Raman datasets from which samples’ origins can be effectively deduced; moreover, a distinction between sedimentary and metamorphic calcite has been also highlighted. The samples, chemically identical, exhibit systematic and reliable differences in Raman band positions, band shape and intensity, which are likely related to the degree of structural order and polarization effects

Hole-depletion of ladders in Sr14_{14}Cu24_{24}O41_{41} induced by correlation effects

The hole distribution in Sr$_{14}$Cu$_{24}$O$_{41}$ is studied by low temperature polarization dependent O K Near-Edge X-ray Absorption Fine Structure measurements and state of the art electronic structure calculations that include core-hole and correlation effects in a mean-field approach. Contrary to all previous analysis, based on semi-empirical models, we show that correlations and antiferromagnetic ordering favor the strong chain hole-attraction. For the remaining small number of holes accommodated on ladders, leg-sites are preferred to rung-sites. The small hole affinity of rung-sites explains naturally the 1D - 2D cross-over in the phase diagram of (La,Y,Sr,Ca)$_{14}$Cu$_{24}$O$_{41}$Comment: 6 pages, 8 figure

Effects of phase transitions in devices actuated by the electromagnetic vacuum force

We study the influence of the electromagnetic vacuum force on the behaviour of a model device based on materials, like germanium tellurides, that undergo fast and reversible metal-insulator transitions on passing from the crystalline to the amorphous phase. The calculations are performed at finite temperature and fully accounting for the behaviour of the material dielectric functions. The results show that the transition can be exploited to extend the distance and energy ranges under which the device can be operated without undergoing stiction phenomena. We discuss the approximation involved in adopting the Casimir expression in simulating nano- and micro- devices at finite temperature

From antiferromagnetism to d-wave superconductivity in the 2D t-J model

We have found that the two dimensional t-J model, for the physical parameter range J/t = 0.4 reproduces the main experimental qualitative features of High-Tc copper oxide superconductors: d-wave superconducting correlations are strongly enhanced upon small doping and clear evidence of off diagonal long range order is found at the optimal doping \delta ~ 0.15. On the other hand antiferromagnetic long range order, clearly present at zero hole doping, is suppressed at small hole density with clear absence of antiferromagnetism at \delta >~ 0.1.Comment: 4 pages, 5 figure

Effect of Coteaching on the Achievement of Middle School Students With Disabilities

From 2014 to 2015, full inclusion through coteaching practices (2 or more professionals providing instruction in the same classroom environment) was implemented at a rural southeastern middle school in Georgia to improve the low academic achievement of students with disabilities (SWDs). The problem is that 8th-grade SWDs score low on the reading and mathematics sections of the Standardized Assessment for Reading and Mathematics (STAR). The purpose of this quantitative quasi-experimental study was to examine the effect of coteaching on the achievement of 8th-grade SWDs in reading and mathematics as measured by the STAR. Vygotsky\u27s zone of proximal development was the theoretical framework for this study because cognitive development can be enhanced with adult guidance and peer collaboration. The research questions focused on the difference in STAR gain scores between the coteaching SWDs participants and the SWDs with no coteaching. The sample was 96 8th-grade SWDs. A t test was used to compare the reading and mathematics gain scores between the academic years 2012 and 2014 (without inclusion/coteaching),46 SWDs and 2015-2017 (with inclusion/coteaching), 50 SWDs. Results showed that there were significant differences in the STAR performance after coteaching implementation in reading and mathematics, p = .045 and p = .004, respectively. This study may lead to positive social change by providing data to the local educational agency leaders, administrators, teachers, and the educational community to make informed decisions about the implementation of coteaching practices, to enhance instructional practices and teaching strategies, and to improve the academic achievement of SWDs allowing them the opportunity to become college and career ready, thus enhancing their postsecondary options

Limits on Phase Separation for Two-Dimensional Strongly Correlated Electrons

From calculations of the high temperature series for the free energy of the two-dimensional t-J model we construct series for ratios of the free energy per hole. The ratios can be extrapolated very accurately to low temperatures and used to investigate phase separation. Our results confirm that phase separation occurs only for J/t greater than 1.2. Also, the phase transition into the phase separated state has Tc of approximately 0.25J for large J/t.Comment: 4 pages, 6 figure