Scaling and Similitude in Single Nozzle Supersonic Retropropulsion Aerodynamics Interference

Retropropulsion, or the firing of rocket engines or motors into the direction of flight, is a method of spacecraft deceleration and soft landing that dates back to the early 1960s. Current conceptual designs for landing humans on the surface of Mars require supersonic retropropulsion, or initiation of retropropulsion at supersonic freestream conditions, as part of an extended powered descent phase of flight. The objective of this work is to identify the design parameters and flow condition bounds for self-similar behavior of powered descent aerodynamic interference in relevant flight environments. In applications of sub-scale test data, an unknown uncertainty lies in scaling to and from full-scale environments and systems. The issue of scaling for the opposing flows characteristic of powered descent is the focus of the following analysis, using data from wind tunnel testing of figurations with a single, central nozzle as a point of departure

Making Diagnostic Testing for Lyme Disease More Approachable

The CDC’s recommended testing and treatment guidelines can be confusing for patients and healthcare providers alike. There is often a knowledge gap in understanding what is being analyzed in serologic tests as well as why two step testing is employed. With the increasing incidence of Lyme in the northeast it is as important as ever to ensure that there is an approachable resource for patients to learn from. Better patient care can be provided while also reducing unnecessary testing and resource overutilization by empowering patients with a better understanding of the process of diagnosis of Lyme diseasehttps://scholarworks.uvm.edu/fmclerk/1285/thumbnail.jp

Aerodynamics for the ADEPT SR-1 Flight Experiment

Adaptable, Deployable, Entry, and Placement Technology (ADEPT) is a combination of a heatshield and an aerodynamic decelerator for atmospheric entry applications. The ADEPT Sounding Rocket (SR)-1 mission was a suborbital flight experiment of an 0.7 m-diameter ADEPT to verify system-level performance and to characterize dynamic stability behavior. The aerodynamic database for ADEPT SR-1 was constructed from non-continuum and continuum flowfield computations, along with data from recent ADEPT ground testing and the IRVE-3 flight test vehicle. High-altitude (free-molecular and transitional regimes) data were generated using DSMC methods. Pre-flight predictions of continuum static aerodynamics coefficients were derived from Reynolds-Averaged Navier-Stokes solutions at conditions along a design trajectory, with comparisons to available ground test data of the nano-ADEPT geometry. Dynamic pitch damping characteristics were taken from functional forms developed for the IRVE-3 flight test vehicle through ballistic range testing. Comparison of pre-flight predictions to post-flight reconstruction of aerodynamic force and moment coefficients is presented

Efficiency improvement of pyrolysis

Ethylene production by pyrolysis of hydrocarbon gases (ethane, propane, butane) and liquid fractions provides better selectivity to ethylene at higher temperatures, as has been well documented in studies. Temperature increase accelerates chainradical reactions of ethylene formation. Acceleration of chain-radical process can be achieved at a given temperature by the presence of an initiating agent of radical formation in the feedstock. Bimolecular reaction of allene (propadiene) with either alkane or alkene hydrocarbons and is an extremely rapid reaction of radicals formation because the endothermicity of this reaction is small and steric ratio is high. This paper considers the use of allene as the initiator of chainradical reactions of pyrolysis. © 2014 WIT Press.International Journal of Safety and Security Engineering;International Journal of Sustainable Development and Planning;WIT Transactions on Ecology and the Environmen

Memory Distortion for Footage of an Emotionally Disturbing Police/Civilian Encounter: Investigating the Influence of Bias and Trauma

Although body-worn cameras (BWCs) are expected to be objective tools for increasing police transparency and accountability, research refutes the idea that people can objectively view footage. Instead, research shows that people’s personal biases—for example, the extent to which people view the police like themselves, measured by the Identification with Police Scale (IPS; Tyler & Fagan, 2008) —shape how they view and interpret BWC footage (Jones, Crozier, & Strange, 2017). Additionally, studies of memory distortion reveal that people can come to remember traumatic events as worse than they originally experienced (Strange & Takarangi, 2012). Taken together, then, when viewing traumatic BWC footage, it is possible that viewers will misremember what they witnessed. What is not clear, however, is how bias and trauma interact to magnify or diminish the level of memory distortion one may experience. In the present study, we instructed participants (N=144) to complete the Identification with Police Scale (IPS) before watching an emotionally disturbing BWC video depicting a police-civilian encounter. Based on a group of independent raters’ categorization of the video, we broke the footage down into a series of short clips and removed some crux (e.g., the civilian being tased) and non-crux (e.g., backup arriving on scene) clips. We intended to have some participants receive context information justifying the officer’s actions before viewing the film, and some not, however a survey flow error meant that everyone received the context information, regardless of condition; this error barred us from determining the impact of context information on memory distortion. Participants then completed the Impact of Events Scale-Revised (IES-R, Weiss & Marmar, 1996) – used to measure the psychological impact of the footage. After 24-hours, participants completed the IES-R a second time. We then tested participants’ memory for what they had seen and had not seen, as well as their confidence in their memory. Our results on memory distortion replicated those of previous studies employing a similar paradigm and provide evidence that people can come to remember BWC footage as more traumatic than their initial experience. As BWC footage is becoming commonplace in society, this research develops our understanding of the impact that viewing emotionally disturbing police-civilian encounters has on memory

Vegetation of the Eastern Arctic between 2.595–2.554 Ma (Data from Lake El’gygytgyn, North-East Russia)

The Pliocene-Pleistocene boundary, set at 2.588 Ma or the base of the Gelasian age, represents a shift in global climates from those of the comparatively warm Pliocene to the cooler conditions of the Pleistocene. Lake El’gygytgyn (Chukotka) provides one of the few continuous terrestrial records that permits a close examination of this important transition in Earth’s climate states. The MIS 102-MIS 103 portion of the El’gygytgyn palynological record indicates that, during the earliest Pleistocene, this area of the Arctic was vegetated by closed Larix-BetulaAlnus forest. Such vegetation contrasts to that of the latest Pliocene, when Larix forest-tundra dominated, and differs from the herb and shrub tundra found today in northern Chukotka. This earliest period of the Gelasian represents the climatic optimum for MIS 103. Even under the most severe conditions during MIS 102, Larix forest-tundra persisted, which differs greatly from the herb tundra that characterized many glacial intervals in the Arctic during the Late and Middle Pleistocene

Optical constatnts of yttrium-iron garnet single-crystal film strucrures

Light-attenuation spectra of yttrium–iron gar-net single-crystal film structures grown on a gallium–gadolinium garnet substrate by liquid-phase epitaxy from the undercooled solution in the melt have been studied and compared with those of bulk yttrium–iron garnet samples. The calculated optical constants are discussed tak-ing into account the influence of crystal field on the splitting of the energy states of iron ions in the film samples.

Molecular Maps in Cereals: Methodology and Progress

Cereals provide for our major food crops, and therefore have been a subject of detailed genetic and cytogenetic studies during major part of the last century. These studies led to the preparation of linkage maps, which were also assigned to individual chromosomes, thus leading to the construction of chromosome maps in all major cereals. In some cases, the availability of cytogenetic stocks (e.g. deletion stocks in bread wheat) also allowed construction of physical maps. In the past, a major limitation in the construction of genetic maps has been the non-availability of mutants for majority of individual genes, so that only handful of genes could be mapped. However, during 1980s, the availability of molecular markers and the high level of DNA polymorphism, which they detect, led to renewed emphasis on genetic and physica.......

Enhancing the smartroom system with e-tourism services

The SmartRoom system is a service-oriented application for assisting such collaboration activity as conference or meeting in a room equipped with computing and presentational devices and Internet access. The development is open source and based on the Smart-M3 platform. In this paper, we consider advanced scenarios for SmartRoom to enhance the latter with e- Tourism services. We introduce a smart space based architecture for this enhancement. We provide an ontology for representing and sharing the tourism-related information for service construction. Based on the architecture and ontology, several case study services are designed. In particular, we implement a service for collaborative construction of a social program for conference participants. The implemented service is integrated into the SmartRoom system and demonstrates the feasibility of the proposed design