8,762 research outputs found
Detection of Hemlock Woolly Adelgid (Hemiptera: Adelgidae) Infestations with Sticky Traps
We deployed sticky traps underneath the crown of eastern hemlock, Tsuga canadensis (L.) Carrière, to assess their sensitivity at detecting crawlers (1st instar nymphs) of the non-native hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae). We found these traps more sensitive at detecting infested trees with low densities of A. tsugae than branch-tip sampling with pole pruners. We observed two peaks of crawler abundance at all sites: these peaks likely represented the timing of the progrediens and sistens crawler stages of A. tsugae. Deployment of sticky traps in treated and high-risk stands may prove useful at detecting residual and new infestations, respectively
Momentum-space engineering of gaseous Bose-Einstein condensates
We show how the momentum distribution of gaseous Bose--Einstein condensates
can be shaped by applying a sequence of standing-wave laser pulses. We present
a theory, whose validity for was demonstrated in an earlier experiment [L.\
Deng, et al., \prl {\bf 83}, 5407 (1999)], of the effect of a two-pulse
sequence on the condensate wavefunction in momentum space. We generalize the
previous result to the case of pulses of arbitrary intensity separated by
arbitrary intervals and show how these parameters can be engineered to produce
a desired final momentum distribution. We find that several momentum
distributions, important in atom-interferometry applications, can be engineered
with high fidelity with two or three pulses.Comment: 13 pages, 4 figure
Propagation of highly nonlinear signals in a two dimensional network of granular chains
We report the first experimental observation of highly nonlinear signals propagating in a two dimensional system composed of granular chains. In this system one of the chains contacts two others to allow splitting and redirecting the solitary-like signal formed in the first chain. The system consists of a double Y-shaped guide in which high- and low-modulus chains of spheres are arranged in various geometries. We observed fast splitting of the initial pulse, rapid chaotization of the signal and sharp bending of the propagating acoustic information. Pulse and energy trapping was also observed in composite systems assembled from hard- and soft-particles in the branches
Shale Investment Dashboard in Ohio Q3 and Q4 2016
This report presents findings from an investigation into shale-related investment in Ohio. The investment estimates are cumulative from July through December of 2016. Prior investments have previously been reported and are available from Cleveland State University. Subsequent reports will estimate additional investment since the date of this report
Shale Investment Dashboard in Ohio Q1 and Q2 2017
This report presents findings from an investigation into shale-related investment in Ohio. The investment estimates are cumulative from January through June of 2017. Prior investments have previously been reported and are available from Cleveland State University. Subsequent reports will estimate additional investment since the date of this report
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