Alaska career pathways: A baseline analysis

This report details the findings from a 2013 statewide study of career pathways (CP) and programs of study (PoS) in secondary districts in Alaska. Twenty-seven of Alaska’s 54 districts provided data around the maturity of their CP/PoS, the availability of different CP/PoS, how career planning is addressed, and the availability of courses and PoS in the Health Sciences cluster. The differences between urban and rural communities are often noted in conversations around education, programming and policy in Alaska, and the data in this report reflect this established phenomenon. The contribution of this report is in helping to demystify and contextualize some of these known differences, and to make differentiated recommendations for moving forward.Acknowledgements / Executive summary / Introduction / Context for study / Method / Participation / Part I - Maturity of career pathway components / Part II - Available PoS within the career clusters / Part III Career planning / Part IV Health / Implications / Limitations / Recommendations / Conclusions / Reference

The Atmosphere Explorer and the shuttle glow

Recent analyses of the Atmosphere Explorer data are discussed in which it is demonstrated that the satellite glows have two components, one at high altitudes which is consistent with excitation in single collisions of atmospheric oxygen atoms with the vehicle surface and the other at low altitudes which is consistent with double collisions of nitrogen molecules. Contrary to an earlier suggestion, the low-altitude data are not consistent with collisions of oxygen molecules. The separation of the two components strengthens the conclusion that the high-altitude glow arises from vibrationally excited OH molecules produced by a formation mechanism that is different from that leading to the normal atmospheric OH airglow. The spectrum is consistent with association of oxygen and hydrogen atoms at sites on the surface into the vibrational levels of OH. The low-altitude glow is consistent with the green mechanism but there are difficulties with it. The shuttle glows are different and have the spectral appearance of emission from NO2. The characteristics of the shuttle glows and the satellite glows will be contrasted and a tentative resolution of the differences in the Atmosphere Explorer and shuttle glows will be offered

Improving intermittent waste heat recovery with ORC systems by integrating thermal energy storage

https://scholarlyworks.lvhn.org/progress_notes/1201/thumbnail.jp

Experimental investigation of a forced convection heat transfer of the organic fluid R-125 at supercritical pressures and under organic rankine cycle conditions

The organic Rankine cycle (ORC) is a suitable technology for utilizing low-grade temperature heat sources of ~100 °C from various industry processes. In the ORC cycle an organic fluid with a lower boiling point is used as a working medium. The performance of the ORCs has advanced significantly in the last decades. However, there is still a possibility of improving the efficiency of this cycle. The supercritical heat transfer in the heat exchanger ensures better thermal match between the heating and working fluids temperatures glides in the heat exchanger. Hence, better understanding of the heat transfer phenomena to a fluid at supercritical state in a horizontal flow and in a large diameter tube is of great importance. Therefore, the tests are performed in a counter-current tube-in-tube test section positioned horizontally with a total length of 4 m and a tube diameter of 0.0286 m. R-125 is used as a working fluid in the experiments. During the measurements the temperature of the heating fluid was 90 °C, the mass flow rate and the pressure of the working fluid R-125 was in the range of 0.2–0.3 kg/s and 38–55 bar respectively. Furthermore, results from the pressure and temperature measurements obtained at the inlet and at the outlet of the test section are reported. The results show that the overall heat transfer coefficient is influenced by the mass flow rate of the organic fluid. At pressures close to the critical pressure of R-125 higher values of the overall heat transfer coefficients are determined. Deteriorated heat transfer is not likely to occur at these operating conditions because the critical heat flux is higher than the one obtained from the measurements. A comparison between the experimental Nusselt number with heat transfer (Nusselt) correlations from the literature is done and the measurement points fall within the uncertainty ranges of both heat transfer correlations.Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .International centre for heat and mass transfer.American society of thermal and fluids engineers

Nero’s Genius: Hypotyposis as Subversion of Rhetoric in Racine’s Britannicus

Since the eighteenth-century, painting and harmony have regularly been celebrated by criticism in Racine’s verses. With the decline of rhetoric, the sedimentation of literature has quickly covered what depended on art of speech. The subversion of rhetoric, in Britannicus’ hypotyposis, could have contributed to this phenomena. As a bad orator, Nero looks at Junie with a careless look. Judicium can be outflanked by ingenium: paying no attention to the natural signs of the èthos, Nero adopts sophistry and her charms.Depuis le XVIIIe siècle, la critique a souvent célébré la peinture et l’harmonie dans les vers de Racine. Les sédiments de la littérature, avec le déclin de la rhétorique, ont vite recouvert ce qui dépendait de l’art de parler. La subversion de la rhétorique, dans l’hypotypose de Britannicus, a pu contribuer à ce phénomène. En mauvais orateur, Néron porte sur Junie un regard sans attention. Le iudicium se laisse déborder par l’ingenium : négligeant les signes d’un èthos naturel et modeste, Néron adopte la sophistique et ses charmes

Experimental assessment of a helical coil heat exchanger operating at subcritical and supercritical conditions in a small-scale solar organic rankine cycle

In this study, the performance of a helical coil heat exchanger operating at subcritical and supercritical conditions is analysed. The counter-current heat exchanger was specially designed to operate at a maximal pressure and temperature of 42 bar and 200 °C, respectively. The small-scale solar organic Rankine cycle (ORC) installation has a net power output of 3 kWe. The first tests were done in a laboratory where an electrical heater was used instead of the concentrated photovoltaic/thermal (CPV/T) collectors. The inlet heating fluid temperature of the water was 95 °C. The effects of different parameters on the heat transfer rate in the heat exchanger were investigated. Particularly, the performance analysis was elaborated considering the changes of the mass flow rate of the working fluid (R-404A) in the range of 0.20–0.33 kg/s and the inlet pressure varying from 18 bar up to 41 bar. Hence, the variation of the heat flux was in the range of 5–9 kW/m2. The results show that the working fluid’s mass flow rate has significant influence on the heat transfer rate rather than the operational pressure. Furthermore, from the comparison between the experimental results with the heat transfer correlations from the literature, the experimental results fall within the uncertainty range for the supercritical analysis but there is a deviation of the investigated subcritical correlations