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| 1 | high-entropy silicide:(Mo_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)W_(0.2))Si_(2)显示文摘A high-entropy metal disilicide,(Mo_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)W_(0.2))Si_(2),has been successfully synthesized.X-ray diffraction(XRD),energy dispersive X-ray spectroscopy(EDX),and electron backscatter diffraction(EBSD)collectively show the formation of a single high-entropy silicide phase.This high-entropy(Mo_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)W_(0.2))Si_(2) possesses a hexagonal C40 crystal structure with ABC stacking sequence and a space group of P6222.This discovery expands the known families of high-entropy materials from metals,oxides,borides,carbides,and nitrides to a silicide,for the first time to our knowledge,as well as demonstrating that a new,non-cubic,crystal structure(with lower symmetry)can be made into highentropy phase.This(Mo_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)W_(0.2))Si_(2) exhibits high nanohardness of 16.7±1.9 GPa and Vickers hardness of 11.6±0.5 GPa.Moreover,it has a low thermal conductivity of 6.9±1.1Wm^(-1) K^(-1),which is approximately one order of magnitude lower than that of the widely-used tetragonal MoSi_(2) and ~1/3 of those reported values for the hexagonal NbSi_(2) and TaSi_(2) with the same crystal structure. | Joshua Gild Jeffrey Braun Kevin Kaufmann Eduardo Marin Tyler Harrington Patrick Hopkins Kenneth Vecchio Jian Luo | 2019 | Journal of Materiomics2019，5，3： | 27 |
| 2 | A method for assessing hydrologic alteration within ecosystems显示文摘 | Brian D Riehter Jeffrey V Baumgartner David P Braun | 1996 | Conservation Biology1996，10，4： | 1 |
| 3 | A method for assessing hydrologic alteration within ecosystems显示文摘 | Brian D Richter Jeffrey V Baumgartner David P Braun | 1996 | Conservation Biology1996，10，4： | 1 |
| 4 | A spatial assessment of hydrologic alteration within a river network 显示文摘 | Brian D Richter Jeffrey V Baumgartner David P Braun | 1998 | Regulated Rivers: Research Management1998，14，： | 1 |
| 5 | Do human activities influence survival and orientation abilities of larval fishes in the ocean?显示文摘The larval stages of most marine fishes spend days to weeks in the pelagic environment,where they must find food and avoid predators in order to survive.Some fish only spend part of their life history in the pelagic environment before returning to their adult habitat,for example,a coral reef.The sensory systems of larval fish develop rapidly during the first few days of their lives,and here we concentrate on the various sensory cues the fish have available to them for survival in the pelagic environment.We focus on the larvae of reef fishes because most is known about them.We also review the major threats caused by human activities that have been identified to have worldwide impact and evaluate how these threats may impact larval-fish survival and orientation abilities.Many human activities negatively affect larval-fish sensory systems or the cues the fish need to detect.Ultimately,this could lead to decreased numbers of larvae surviving to settlement,and,therefore,to decreased abundance of adult fishes.Although we focus on species wherein the larvae and adults occupy different habitats(pelagic and demersal,respectively),it is important to acknowledge that the potential anthropogenic effects we identify may also apply to larvae of species like tuna and herring,where both larvae and adults are pelagic. | Ulrike E.SIEBECK Jack O’CONNOR Christoph BRAUN Jeffrey M.LEIS | 2015 | Integrative Zoology2015，10，1： | 0 |
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