Extending the calibration in the Underwater Sound Reference Division (USRD) reciprocity coupler to incorporate phase

In this report, a phase measurement is added to the Underwater Sound Reference Division (USRD) reciprocity coupler primary calibration procedure for an H48 reference hydrophone. Data acquisition equipment is added to record time-series data from the hydrophone under test and from the reciprocal transducers. The complex-valued hydrophone sensitivity is calculated. The sensitivity magnitude is compared to measurements from the standard coupler calibration procedure, and the complex sensitivity data are also fitted to a simple high-pass circuit model. The model is used to estimate the low-frequency cutoff of H48 hydrophone SN4. The low-frequency cutoff measured in this report is about 0.2 Hz higher than that originally measured and specified when the H48 hydrophones were first built. The new results show significant roll-off in phase below 10-20 Hz, a range where the phase is typically assumed flat during the standard calibration. By 1 Hz the phase roll-off is about 20°. The error analysis of the original coupler is summarized and error and uncertainty due to new data acquisition equipment and phase measurement added. Some errors due to simplifications in the acoustics of the coupler are left to future work.http://archive.org/details/extendingcalibra1094550486Civilian, Department of the NavyApproved for public release; distribution is unlimited

A dynamically adaptive mesh method for internal flows

A dynamic solution adaptive mesh method was implemented into a finite-volume numerical method for solving unsteady flowfields described by the two-dimensional, unsteady, Navier-Stokes and Euler equations. The objective was to improve the resolution and accuracy of solutions which contained flow gradients which varied in strength and position with time. Variational principles were used to formulate the mesh equations with which meshes were generated to have the desired smoothness, orthogonality, and volume adaption qualities. The adaption of the mesh to the flow solution was driven by the presence of flow gradients. The dynamics of the mesh was accounted for in the flow equations through the mesh speeds. A comparison was made between one approach which computed the mesh speeds from a backwards time differences of the mesh and another approach which computed the mesh speeds from a system of mesh speed equations which were derived from the time differentiation of the mesh equations. The dynamically adaptive mesh method was demonstrated for model problems involving solution and boundary dynamics, inviscid flows in a converging-diverging nozzle, viscous boundary-layer flows over flat plates, and viscous flows in a transonic diffuser. It was found that the approach using the mesh speed equations was more accurate than the approach using the time-differenced mesh speeds. There was difficulty is obtaining proper clustering of the meshes for viscous flows

William Salter and Margaret Salter to Sarah Kean, June 22, 1829

Mortgage indenture between Sarah Kean and William Slater and his wife, Margaret Slater. Prepared and signed by George T. Elliot. People Included: Elias Mooney, Richard Guyouhttps://digitalcommons.kean.edu/lhc_1820s/1128/thumbnail.jp

Re-imagining money to broaden the future of development finance: what Kenyan community currencies reveal is possible for financing development

This paper argues that it is important to understand the nature of money and its impacts to be able to engage better with currency innovations for sustainable development. The paper focuses on the case of Bangla-Pesa, an alternative currency used in poor urban areas in Kenya, to demonstrate how currency innovation can work for poor people. The Kenyan non-governmental organization, Grassroots Economics, is helping to create business networks in the poorest urban areas. Vouchers, issued and honoured by every member of the network, function as a form of currency. This has led to an increase in turnover of more than 20 percent and corresponding economic growth, as well as a reduction of waste and unemployment. This model requires very little investment. However, despite an excellent and documented track record, Grassroots Economics was unable to secure any institutional funding. The authors suspect that this lack of support arises from a lack of understanding among development professionals about the nature of money, how new currencies can be created and which innovations are useful. This paper therefore seeks to inform policy makers about the nature of money, offering a new typology of money called the Value-Sequence Typology, which categorizes “monies” based on the process and justification for issuing new units, or in this case, vouchers. The authors propose a new definition of money as a system of agreements and symbols which influence the creation and exchange of value and power. The agreements, whether explicit or implicit, about the relationship between the symbols of money and when the actual value of what was monetized changes hands, (before, during, or after) are the most important signifier of money types. Grassroots economics, in a context of a community of micro-entrepreneurs, uses a Collaborative Credit System (CCS) in which members issue interest free credit to each other. This is similar to how most national currencies are created, yet it is done peer-to-peer, without the involvement of banks. The authors feel this is particularly important in a time of declining official development assistance. Creative insight into the nature of money could enable a new era in development cooperation through promotion of collaborative credit systems

Validation of a skinfold based index for tracking proportional changes in lean mass

BACKGROUND: The lean mass index (LMI) is a new empirical measure that tracks within‐subject proportional changes in body mass adjusted for changes in skinfold thickness. OBJECTIVE: To compare the ability of the LMI and other skinfold derived measures of lean mass to monitor changes in lean mass. METHODS: 20 elite rugby union players undertook full anthropometric profiles on two occasions 10 weeks apart to calculate the LMI and five skinfold based measures of lean mass. Hydrodensitometry, deuterium dilution, and dual energy x ray absorptiometry provided a criterion choice, four compartment (4C) measure of lean mass for validation purposes. Regression based measures of validity, derived for within‐subject proportional changes through log transformation, included correlation coefficients and standard errors of the estimate. RESULTS: The correlation between change scores for the LMI and 4C lean mass was moderate (0.37, 90% confidence interval −0.01 to 0.66) and similar to the correlations for the other practical measures of lean mass (range 0.26 to 0.42). Standard errors of the estimate for the practical measures were in the range of 2.8–2.9%. The LMI correctly identified the direction of change in 4C lean mass for 14 of the 20 athletes, compared with 11 to 13 for the other practical measures of lean mass. CONCLUSIONS: The LMI is probably as good as other skinfold based measures for tracking lean mass and is theoretically more appropriate. Given the impracticality of the 4C criterion measure for routine field use, the LMI may offer a convenient alternative for monitoring physique changes, provided its utility is established under various conditions

Hydrometeorological response to afforestation in the UK: findings from a kilometer-scale climate model

Afforestation is of international interest for its positive benefits on carbon storage, ecology, and society, but its impacts on terrestrial and atmospheric processes are still poorly understood. This study presents the first use of a coupled land surface and convection permitting atmospheric model (CPM) to quantify hydrometeorological effects of afforestation across the United Kingdom, focusing on atmospheric processes often missing in hydrological models. Generating a scenario of 93 000 km2 (40%) additional woodland across the UK, the periods of 2042–2052 and 2062–2072 are analysed. Simulated afforestation alters seasonal and regional UK hydrometeorology. Countrywide runoff increases in all seasons (between 5.4–11 mm and 4.3–8.6% per season) due to elevated subsurface flows from greater soil moisture. Evaporation decreases in summer (−20.6 mm, −10%) but increases in winter (8.1 mm, 15%) whereas rainfall increases throughout all seasons (between 2.2–6.86 mm and 0.9%–2.2% per season). Greater winter rainfall is detected along Great Britain’s west coastline as increased surface roughness produces prolonged and heavier rainfall. In the summer, lower albedo increases potential evapotranspiration and reduces near surface specific humidity: water is locked in deeper soil layers as transpiration diminishes and the topsoil dries out. However, the magnitude of hydrometeorological change due to altered land cover is smaller than the uncertainty in local climate change projections. This work sets a precedent in illustrating the impacts of afforestation on hydrology using a high-resolution CPM and highlights the importance of coupled hydrometeorological processes when investigating land cover impacts on hydrological processes

Automation of Hubble Space Telescope Mission Operations

On June 13, 2011, after more than 21 years, 115 thousand orbits, and nearly 1 million exposures taken, the operation of the Hubble Space Telescope successfully transitioned from 24x7x365 staffing to 815 staffing. This required the automation of routine mission operations including telemetry and forward link acquisition, data dumping and solid-state recorder management, stored command loading, and health and safety monitoring of both the observatory and the HST Ground System. These changes were driven by budget reductions, and required ground system and onboard spacecraft enhancements across the entire operations spectrum, from planning and scheduling systems to payload flight software. Changes in personnel and staffing were required in order to adapt to the new roles and responsibilities required in the new automated operations era. This paper will provide a high level overview of the obstacles to automating nominal HST mission operations, both technical and cultural, and how those obstacles were overcome

Some Current Trends of Tanning in Kansas: Using Google Maps and Behavioral Economics to Explore Travel Based Interventions

This presentation was given as part of the GIS Day@KU symposium on November 18, 2015. For more information about GIS Day@KU activities, please see http://www.gis.ku.edu/gisday/2015/.Platinum Sponsors: KU Department of Geography and Atmospheric Science; KU School of Business. Gold Sponsors: Bartlett & West; Kansas Biological Survey; KU Environmental Studies Program; KU Institute for Policy & Social Research; KU Libraries. Silver Sponsors: State of Kansas Data Access and Support Center (DASC). Bronze Sponsors: KU Center for Remote Sensing of Ice Sheets (CReSIS); TREKK Design Group, LLC; Wilson & Company, Engineers and Architects

Vocal learning in animals and humans

Funding: S.C.V. was supported by a Max Planck Research Group (MPRG), a Human Frontiers Science Program (HFSP) Research grant (grant no. RGP0058/2016) and a UKRI Future Leaders Fellowship (MR/T021985/1).Publisher PDFPeer reviewe