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Invasive species are an exorbitant problem, which is being seen all over the world and is enveloping local ecosystems in a shroud of death and extinction. While some argue semantics over the anthropocene, the planet has without a doubt entered an epoch of mass extinction as a result of human action in climate, species displacement, and introduction of invasive species into fragile ecosystems (Kolbert 2014). In this paper, researchers analyzed the effectiveness of local invasive species management by researching a specific particularly destructive and deeply embedded invasive liana colloquially known as English Ivy (binomial nomenclature Hedra helix). Researchers consulted local experts, and compared a percentage cover map of invasives from 2007 to a newly created map. Furthermore, researchers collected accounts of management methods and practices from workers, volunteers, and experts. This paper found that management methods in Arlington Virginia have been marginally effective, with an 11% decrease in percentage cover of Hedra helix in Arlington parks when compared to the map in 2007 (Appendix A; Appendix B)

Rectangular hollow structural sections (HSS) are commonly used as bracing in concentrically braced frames (CBFs) designed and detailed for seismic design requirements. As the primary yielding component in CBFs, braces are expected to sustain large inelastic axial deformation during earthquake loading. It is well known that their deformation capacity depends on the width-to-thickness ratio (local slenderness). Until 2013, HSS sections were produced to meet ASTM standard A500/A500M; after 2013, the ASTM 1085 specification was implemented, and since that time, HSS sections have also been produced to meet ASTM A1085/A1085M standards. Where the ASTM A500/A500M specification requires minimum yield and tensile stress values as well as a minimum elongation and tolerances on the wall thickness, the ASTM A1085/A1085M specification also requires a minimum Charpy V-notch (CVN) toughness, a maximum yield stress of the steel, and tighter tolerances on the wall thickness and radius of curvature of the corner. These requirements offer a more reliable brace for CBFs in seismic regions. Yet there has been limited research investigating the cyclic axial response of these members. A research study was undertaken to investigate the response of ASTM A1085/A1085M tubes using the response of ASTM A500C tubes as their reference. Forty-one brace specimens were tested under cyclic inelastic axial deformation. Comparison of the data shows that most of the ASTM A500/A500 M Grade C and ASTM A1085/1085M braces meet the respective requirements of their respective ASTM standard and that the differences between the performance of ASTM A500/A500M and ASTM A1085/1085M braces are not dramatic. In addition, the study investigated the impact of width-to-thickness ratio, global slenderness, and displacement history on the response of the braces. The data show that the current AISC 341-22 high-ductility slenderness limit for special concentrically braced frame (SCBF) braces is slightly conservative. However, the data suggest that the moderate ductility slenderness limit used for ordinary concentrically braced frame (OCBF) braces is significantly more conservative than required for consistent seismic safety. Further research is required to determine appropriate limits; this paper provides some initial recommendations based on this dataset.

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This chapter contains entries titled: Main contract to Mutual dealings

We have carried out high-gravity model atmosphere and accretion disk synthetic spectral fits for the U Geminorum type dwarf novae during quiescence. For UZ Ser, we find that the far-UV spectrum is best fitted with a log g = 8, Teff = 27,000 K photosphere with abundances near solar. The best-fit accretion disk model for UZ Ser has Mwd = 1.0 M⊙, disk inclination i = 75°, and = 10-9 M⊙ yr-1. For SS Aur, the best-fit model photosphere has Teff = 30,000K, log g = 8, and solar composition abundances, while the best-fit accretion disk model has Mwd = 1.0 M⊙, i = 41°, and = 10-10 M⊙ yr-1. These accretion rates are discussed in connection with the critical accretion rates predicted by the disk instability theory. Whether a white dwarf or a disk accounts for the far-UV spectra, they must be quite hot. If indeed the white dwarf dominates the far-UV light, then UZ Ser and SS Aur add two important temperatures in support of the conclusion that the accreting white dwarfs above the period gap are a factor of 1.5–2 times hotter than the accreting cataclysmic variable degenerates in systems below the period gap.

ChemInformVolume 20, Issue 28 Reviews ChemInform Abstract: Brominated Aromatic and Heteroaromatic Compounds B. IDDON, B. IDDON Edited by Price, D. ;Iddon, B. ;Wakefield, B. J. ;Elsevier, Amsterdam, Neth.Search for more papers by this authorB. J. WAKEFIELD, B. J. WAKEFIELD Edited by Price, D. ;Iddon, B. ;Wakefield, B. J. ;Elsevier, Amsterdam, Neth.Search for more papers by this author B. IDDON, B. IDDON Edited by Price, D. ;Iddon, B. ;Wakefield, B. J. ;Elsevier, Amsterdam, Neth.Search for more papers by this authorB. J. WAKEFIELD, B. J. WAKEFIELD Edited by Price, D. ;Iddon, B. ;Wakefield, B. J. ;Elsevier, Amsterdam, Neth.Search for more papers by this author First published: July 11, 1989 https://doi.org/10.1002/chin.198928351Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume20, Issue28July 11, 1989 RelatedInformation

Christman, Luther Ph.D., R.N., F.A.A.N.; Lockhart, Carol R.N., M.S.; Werther, William S. Jr. Ph.D. Author Information

A single powerful theorem to solve quadratic equalities and inequalities.