1,171 research outputs found
Stress-wave analysis technique study on thick-walled type A302B steel pressure vessels, July 1968 - July 1969
Stress wave analysis and crack opening displacement to monitor subcritical crack growth for grade B alloy steel pressure vessel
Correlation of stress-wave-emission characteristics with fracture in aluminum alloys, 1 September - 1 December 1969
Cryogenic testing of aluminum alloy specimens for fracture toughness and stress wave dat
Monitoring of crack growth in Ti-Al-4v alloy by the stress wave analysis technique
Stress wave analysis techniques for monitoring crack growth in Ti-6Al-4V alloy pressure vessel wall
Development of A Professional Code of Ethics in Digital Forensics
Academics, government officials, and practitioners suggest the field of digital forensics is in need of a professional code of ethics. In response to this need, the authors developed and proposed a professional code of ethics in digital forensics. The current paper will discuss the process of developing the professional code of ethics, which included four sets of revisions based on feedback and suggestions provided by members of the digital forensic community. The final version of the Professional Code of Ethics in Digital Forensics includes eight statements, and we hope this is a step toward unifying the field of digital forensics as a profession
Winter Habitat Associations of Blackbirds and Starlings Wintering in the South-Central United States
Birds can cause extensive crop damage in the United States. In some regions, depredating species comprise a substantial portion of the total avian population, emphasizing their importance both economically and ecologically. We used the National Audubon Society Christmas Bird Count data from the south-central United States and mixed-effects models to identify habitat factors associated with population trend and abundance for 5 species: red-winged blackbird (Agelaius phoeniceus), common grackle (Quiscalus quiscula), rusty blackbird (Euphagus carolinus), Brewer’s blackbird (Euphagus cyanocephalus), and European starling (Sturnus vulgaris). Overall, we found positive associations between bird abundance and agricultural land-cover for all species. Relationships between abundance and other land-cover types were species-specific, often with contrasting relationships among species. Likewise, we found no consistent patterns among abundance and climate. Of the 5 species, only red-winged blackbirds had a significant population trend in our study area, increasing annually by 2.4%. There was marginal evidence to suggest population increases for rusty blackbirds, whereas all other species showed no trend in population size within our study area. Our study provides managers who are interested in limiting crop damage in the south-central United States with novel information on habitat associations in the region that could be used to improve management and control action
A Hetero-Diels−Alder Approach to Complex Pyrones:  An Improved Synthesis of the Spongistatin AB Spiroketal
The conversion of a substituted dioxinone to a pyrone was used in an improved synthesis of the AB spiroketal subunit of the spongistatins. This transformation occurred via a hetero-Diels-Alder reaction of an acyl ketene with butyl vinyl ether. A double diastereoselective Mukaiyama aldol reaction is used to provide the hetero-Diels-Alder precursor
Enantioselective Total Synthesis of Bistramide A
The enantioselective synthesis of bistramide A has been achieved with a longest linear sequence of 18 steps. The synthetic strategy involves the use of a distereoselective glycolate alkylation, an aldol addition of a chlorotitanium enolate of N-acylthiazolidinthione, and a Sharpless asymmetric epoxidation to synthesize the three key fragments
Total Synthesis of the Proposed Structure of Briarellin J
The total synthesis of the originally proposed structure of briarellin J is reported in 15 steps from a known compound and in 23 steps from readily available materials. Key reactions include an exo selective intramolecular Diels-Alder and a substrate controlled hydroboration. Discrepancies in the spectroscopic data of the synthetic and natural material led to a revision of the assigned structure
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