Non-Linear Analysis of the NASA Super Pressure Balloons: Whole Flight Simulations

Tensys have a long-established background in the shape generation and load analysis of architectural stressed membrane structures. Founded upon their inTENS finite element analysis suite, these activities have broadened to encompass 'lighter than air' structures such as aerostats, airships, hybrid air vehicles and stratospheric balloons. Tensys have acted as consultants to the NASA Super Pressure Balloon (SPB) Program since 2004. Previous papers have focussed upon the application of inTENS to the overall structural and stability analysis of pumpkin type balloons as used in the SPB Program. Particular emphasis has been placed upon the ability to study both stress and stability at all stages of a flight. As the program has developed, increasing modelling fidelity has been introduced as design refinement has moved emphasis from the overall shape to the performance of individual details. Examples include the introduction of a contact capability into inTENS to better represent the separate cap layer of film. Localised investigations have considered the consequence of local geometric anomalies introduced during fabrication and the effects of debonding of the PBO tendon within its sleeve. Analysis to date has used a material model for the polyethylene shell film developed by Dr Rand of Winzen Engineering, supported by a program of fine resolution material tests at the Balloon Research and Development Laboratory (BRDL) at the GSFC Wallops Island Facility. Based upon work first reported by Schapery, this model has been incorporated into so-called 'snapshot' analyses within inTENS. For a given elapsed time point and temperature distribution, non-linear material properties are iteratively updated for the current stress state in each individual element until changes in those material properties are insignificant. This process has to be iterative as the film stresses and material properties are interdependent. Attempts to derive a time-stepping incremental viscoelastic capability using the Schapery Rand model encountered problems when dealing with the varying temperatures associated with balloon deployment, pressurisation and diurnal behaviour. An alternative approach has been developed by Pellegrino et al at Caltech, again with support from the NASA Balloon Program Office. This is a large strain non-linear viscoelastic model that includes film out-of-plane mechanical and thermal effects. Working from a unified base, this model can be utilised for time-stepping analyses in both a modulus or compliance mode, or a combination of both. This new capability is intended to enhance the current NASA balloon design process. This paper presents the implementation of the Caltech model into a specialist finite element suite, inTENS and its application to whole flight simulations

Developing Models for Multi-Talker Listening Tasks using the EPIC Architecture: Wrong Turns and Lessons Learned

This report describes the development of a series of computational cognitive architecture models for the multi-channel listening task studied in the fields of audition and human performance. The models can account for the phenomena in which humans can respond to a designated spoken message in the context of multiple simultaneous speech messages from multiple speakers - the so-called "cocktail party effect." They are the first models of a new class that combine psychoacoustic perceptual mechanisms with production-system cognitive processing to account for the end-to-end performance in an important empirical literature.Office of Naval Research, Cognitive Science Program, under grant numbers N00014-10-1-0152 and N00014-13-1-0358, and the U. S. Air Force 711 HW Chief Scientist Seedling programhttp://deepblue.lib.umich.edu/bitstream/2027.42/108165/1/Kieras_Wakefield_TR_EPIC_17_July_2014.pdf-1Description of Kieras_Wakefield_TR_EPIC_17_July_2014.pdf : Technical report conten

Extending density surface models to include multiple and double-observer survey data

David L. Miller was funded by OPNAV N45 and the SURTASS LFA Settlement Agreement, being managed by the U.S. Navy’s Living Marine Resources program under Contract No. N39430-17-C-1982, collaboration between Douglas B. Sigourney and David L. Miller was also facilitated by the DenMod working group (https://synergy.st-andrews.ac.uk/denmod/) funded under the same agreement. The survey that the fin whale data originate from was funded through two inter-agency agreements with the National Marine Fisheries Service: inter-agency agreement number M14PG00005 with the US Department of the Interior, Bureau of Ocean Energy Management, Environmental Studies Program, Washington, DC and inter-agency agreement number NEC-16-011-01-FY18 with the US Navy. The survey that the fulmar data originate from was funded by the UK Natural Environmental Research Council (NERC) grant NE/M017990/1.Spatial models of density and abundance are widely used in both ecological research (e.g., to study habitat use) and wildlife management (e.g., for population monitoring and environmental impact assessment). Increasingly, modellers are tasked with integrating data from multiple sources, collected via different observation processes. Distance sampling is an efficient and widely used survey and analysis technique. Within this framework, observation processes are modelled via detection functions. We seek to take multiple data sources and fit them in a single spatial model. Density surface models (DSMs) are a two-stage approach: first accounting for detectability via distance sampling methods, then modelling distribution via a generalized additive model. However, current software and theory does not address the issue of multiple data sources. We extend the DSM approach to accommodate data from multiple surveys, collected via conventional distance sampling, double-observer distance sampling (used to account for incomplete detection at zero distance) and strip transects. Variance propagation ensures that uncertainty is correctly accounted for in final estimates of abundance. Methods described here are implemented in the dsm R package. We briefly analyse two datasets to illustrate these new developments. Our new methodology enables data from multiple distance sampling surveys of different types to be treated in a single spatial model, enabling more robust abundance estimation, potentially over wider geographical or temporal domains.Publisher PDFPeer reviewe

Progress toward phidianidine analogues containing a 1,2,3-triazole ring

Phidianidines are a class of compound that has been extracted from the sea mollusk Phidianis militaris. These compounds have been shown to exhibit a variety of useful properties such as antihistamine effects, anti-cancer activity, agonism of the µ-opioid receptor and neuroprotection. The biological activities are thought to be caused by the 1,2,4- oxadiazole ring found within the molecule. The goal of this project is to synthesize analogues of phidianidine that contain a 1,2,3-triazole instead of the 1,2,4 oxadiazole ring using a method that will allow for other regions of the molecule to be changed. This will help to elucidate the role of the 1,2,4-oxadiazole ring in biological activity as well as probe if the 1,2,3-triazole analogue can provide significant improvement to any activities

Confronting the “fraud bottleneck”: private sanctions for fraud and their implications for justice

Purpose – The purpose of this paper is to illustrate the ways in which contemporary organisations are imposing their own private sanctions on fraudsters. Design/methodology/approach – The research draws on primary data from interviews with counter fraud practitioners in the UK, secondary sources and case examples. Findings – Such developments have been stimulated, at least in part, by the broader limitations of the criminal justice system and in particular a “fraud bottleneck”. Alongside criminal sanctions, many examples are provided of organisations employing private prosecutions innovative forms of civil sanction and “pseudo state” sanctions, most commonly civil penalties comparable to fines. Research limitations/implications – Such changes could mark the beginning of the “rebirth of private prosecution” and the further expansion of private punishment. Growing private involvement in state sanctions and the development of private sanctions represents a risk to traditional guarantees of justice. There are differences in which comparable frauds are dealt with by corporate bodies and thus considerable inconsistency in sanctions imposed. In contrast with criminal justice measures, there is no rehabilitative element to private sanctions. More research is needed to assess the extent of such measures, and establish what is happening, the wider social implications, and whether greater state regulation is needed. Practical implications – Private sanctions for fraud are likely to continue to grow, as organisations pursue their own measures rather than relying on increasingly over-stretched criminal justice systems. Their emergence, extent and implications are not fully understood by researchers and therefore need much more research, consideration and debate. These private measures need to be more actively recognised by criminal justice policy-makers and analysts alongside the already substantial formal involvement of the private sector in punishment through prisons, electronic tagging and probation, for example. Such measures lack the checks and balances, and greater degree of consistency as laid out in sentencing guidelines, of the criminal justice system. In light of this, consideration needs to be given to greater state regulation of private sanctions for fraud. More also needs to be done to help fraudsters suffering problems such as debt or addiction to rebuild their lives. There is a strong case for measures beyond the criminal justice system to support such fraudsters to be created and publicly promoted. Originality/value – The findings are of relevance to criminal justice policy-makers, academics and counter fraud practitioners in the public and private sectors

2013-14 Guest Artist Series: American Brass Quintet

Kennesaw State University School of Music presents the American Brass Quintet.https://digitalcommons.kennesaw.edu/musicprograms/1385/thumbnail.jp