A Faceted Magnetron Concept Using Field Emission Cathodes

A magnetron concept using field emission cathodes has been modeled with the Air Force Research Laboratory particle-in-cell code ICEPIC and the 2D particle trajectory simulation Lorentz2E. In this approach, field emitters are used to provide a distributed cathode in place of a traditional thermionic cathode. The emitters are placed below the interaction space in a shielded structure. The cathode is comprised of facet plates with slits to protect the emitters. Simulation of an L-band rising sun magnetron shows that the faceted magnetron will oscillate using both five and ten facet cathodes. The startup times are very similar to that of a cylindrical cathode magnetron. The electron trajectories of the shielded slit structure have been modeled, and the results indicate that electrons can be injected through the slits and into the interaction space using lateral edge emitters and a pusher electrode design

Temporal Ontology in Ecology: Developing an ecological awareness through time, temporality and the past-present parallax

Theoretical applications of time and temporality remain a key consideration for both climate scientists and the humanities. By way of extending this importance, we critically examine Timothy Morton’s proposed “ecological awareness” alongside Slavoj Žižek’s “parallax view”. In doing so, the article introduces a “past-present parallax” in order to contest that, while conceptions of the past are marked by “lack”, equally, our conceptions of and relations to Nature remain grounded in an ontological incompleteness, marked by contingency. This novel approach presents an ecological awareness that remains temporally attuned to the impasses and inconsistencies which frame our relations in/with Nature

Holt & Plyler (1984) Checklist of the Vascular Flora of the Robert B. Gordon Natural Area

This research represents the first site-wide floristic survey of the Gordon Natural Area (GNA), and consists of 348 species in 238 genera and 95 families. The survey was conducted by two West Chester University undergraduate students, Jack Holt and Jim Plyler, under the supervision of Dr. William Overlease. The bulk of the work took place during 1984; however, some woody species previously noted in the GNA by Jim Plyler were also incorporated into the list. The checklist was compiled for all vascular families encountered at the GNA, with the exception of the Grass Family (Poaceae), Rush Family (Juncaceae), and Sedge Family (Cyperaceae). This checklist stood as the sole site-wide checklist for the preserve until 2007, when Jack Holt and botanist Janet Ebert conducted the second site-wide survey of the GNA. In contrast to the initial survey, the 2007 survey included grasses, rushes, and sedges. Species names were standardized by N. Ritter to follow the nomenclature in USDA PLANTS. Species marked with an asterisk are those that were last noted in the GNA in 1984. Of the 348 species, 265 are native to the lower 48 States and 81 are introduced (indicated in red in the list). Two species, Calystegium sepens and Polygonum scandens, are considered to be native in some parts of the lower 48 states and introduced in other portions

Declared funding and authorship by alcohol industry actors in the scientific literature: a bibliometric study

BACKGROUND Alcohol industry actors are known to be involved in scientific research. Despite concerns regarding bias, the extent of involvement and coverage of this research are unknown. METHODS We aimed to investigate the extent and type of scientific research 1918-2019 which was supported by the alcohol industry, including alcohol companies themselves and other organizations, such as trade associations. We identified bibliographic records from the Web of Science suite of databases which have named alcohol companies or organizations in the fields relating to author affiliations and support declarations. We then ascertained trends in publications over time, type of support, funding, outlets (such as journal titles), subject areas covered (such as health) and named companies (such as Carlsberg) and organizations (such as Drinkaware). RESULTS The analysis included 13 481 unique records, 11 014 (82%) were authored or funded by alcohol companies and 2488 (18%) were authored or funded by other organizations. The majority of the records (90%, 12 157/13 481) were journal publications. The most common subject areas covered by the publications were biology (5415/13 481, 40%), chemistry (3937/13 481, 29%) and health (3707/13 481, 27%). In line with general publishing trends, there has been an overall increase in research funded or supported by alcohol companies and organizations since records began. The main exception is the steady decline in company author affiliations, particularly in health-related topics since the mid-1990s. CONCLUSIONS Alcohol companies and related organizations are extensively involved in or supporting scientific research according to data in Web of Science. This does not, however, necessarily reflect the totality of scientific research produced by alcohol companies and related organizations

An Overview of NPP VIIRS Pre-Launch and On-Orbit Calibration and Characterization

NPP Visible Infrared Imaging Radiometer Suite (VIIRS) test program at the instrument and observatory level is complete and has provided an extensive amount of high quality data to enable the assessment of sensor performance

Lunar regolith bagging system

A design of a lunar regolith bag and bagging system is described. The bags of regolith are to be used for construction applications on the lunar surface. The machine is designed to be used in conjunction with the lunar SKITTER currently under development. The bags for this system are 1 cu ft volume and are made from a fiberglass composite weave. The machinery is constructed mostly from a boron/aluminum composite. The machine can fill 120 bags per hour and work for 8 hours a day. The man hours to machine hours ratio to operate the machine is .5/8

Understanding and Using Sire Summaries.

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BABBITTED BEARING HEALTH ASSESSMENT

TutorialWithin most plants there is often a desire to extend the time between outages. Several factors determine this but one to consider is the bearings ability to run for the extended time. This Tutorial will address common bearing failure mechanisms, tools available to diagnose these problems and ways to use that information to make decisions on continued operation. Evaluation consists of analysis of Condition Monitoring information coupled with rotor dynamic analysis and computerized bearing modeling. A case study will be presented that details the evaluation of a distressed bearing. Analysis allowed the user to determine they could slightly reduce running speed (to limit vibration to a certain level) and continue to run to the scheduled outage date. There will then be a discussion on bearing robustness and ways to design bearings for long life. A case study will be presented where an Ethylene plant desired to extend the time between outages but the existing bearings prohibited that. The determination was made that upgrading the bearings to a more robust design would allow the extended time between outages