Multi-provider network service embedding

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Gravitational-wave luminosity of binary neutron stars mergers

We study the gravitational-wave peak luminosity and radiated energy of quasicircular neutron star mergers using a large sample of numerical relativity simulations with different binary parameters and input physics. The peak luminosity for all the binaries can be described in terms of the mass ratio and of the leading-order post-Newtonian tidal parameter solely. The mergers resulting in a prompt collapse to black hole have largest peak luminosities. However, the largest amount of energy per unit mass is radiated by mergers that produce a hypermassive neutron star or a massive neutron star remnant. We quantify the gravitational-wave luminosity of binary neutron star merger events, and set upper limits on the radiated energy and the remnant angular momentum from these events. We find that there is an empirical universal relation connecting the total gravitational radiation and the angular momentum of the remnant. Our results constrain the final spin of the remnant black-hole and also indicate that stable neutron star remnant forms with super-Keplerian angular momentum.Comment: 5 pages, 4 figure

The Montana Judicial and Non-judicial Foreclosure Sale: Analysis and Suggestions for Reform

The Montana Judicial and Non-judicial Foreclosure Sale: Analysis and Suggestions for Refor

Effect of timing of growing season drought on flowering of Andropogon gerardii, The

Includes bibliographical references.2015 Fall.Timing of precipitation is equally important as amount for determining ecosystem function, especially aboveground net primary productivity (ANPP), in a variety of ecosystems. The particular precipitation period(s) of greatest importance varies between ecosystems. In tallgrass prairie of the central US, the relative importance of different precipitation periods is dictated by the phenology of the dominant C4 grasses, in particular Andropogon gerardii which can contribute >80% to ANPP in this ecosystem. It is predicted that precipitation periods with the greatest impact on the highly variable flowering rates of A. gerardii are likely to be particularly important for determining ANPP, as flowering individuals are much larger (>2-fold) than non-flowering individuals. The potential for flowering may be affected by precipitation at different times via different mechanisms (e.g. carbon gain via rapid growth early in the growing season vs. direct effects on stalk elongation later in the growing season). In order to test the differential effects of precipitation timing, rainfall deficits (100% exclusion) at different periods of the growing season were imposed on native tallgrass prairie in Kansas, USA. Contrary to expectations, the most sensitive period in terms of flowering for A. gerardii did not coincide with the highest potential photosynthetic rates early in the growing season. Rather the most sensitive period was mid to late summer immediately preceding, and concurrent with, the initiation of flowering stalks. Growth rate, leaf water potential and carbon assimilation of A. gerardii were all most sensitive to drought late in the growing season, suggesting that growth regulation in response to plant water status, not current year’s carbon accumulation is the critical factor determining flowering responses to precipitation or lack thereof. Flowering, in addition to influencing ANPP, controls rates of sexual reproduction which in turn limit adaptation and migration, and thus understanding how flowering will be influenced by a changing climate is critical for predicting plant community and ecosystem responses in tallgrass prairie. My study suggests that increased frequency of growing season droughts forecast with climate change could result in reduced ANPP and reproductive success of the dominant grasses in the tallgrass prairie ecosystem

Increasing Microcystis cell density enhances microcystin synthesis: a mesocosm study

An experimental protocol using mesocosms was established to study the effect of Microcystis sp. cell abundance on microcystin production. The mesocosms (55 L) were set up in a shallow eutrophic lake and received either no (control), low (to simulate a moderate surface accumulation), or high (to simulate a dense surface scum) concentrations of Microcystis sp. cells collected from the lake water adjacent to the mesocosms. In the low- and high-cell addition mesocosms (2 replicates of each), the initial addition of Microcystis sp. cells doubled the starting cell abundance from 500 000 to 1 000 000 cells mL⁻¹, but there was no detectable effect on microcystin quotas. Two further cell additions were made to the high-cell addition mesocosms after 60 and 120 min, increasing densities to 2 900 000 and 7 000 000 cells mL-1, respectively. Both additions resulted in marked increases in microcystin quotas from 0.1 pg cell-1 to 0.60 and 1.38 pg cell⁻¹, respectively, over the 240 min period. Extracellular microcystins accounted for <12% of the total microcystin load throughout the whole experiment. The results of this study indicate a relationship between Microcystis cell abundance and/or mutually correlated environmental parameters and microcystin synthesis

Dissipative quantum control of a spin chain

A protocol is discussed for preparing a spin chain in a generic many-body state in the asymptotic limit of tailored non-unitary dynamics. The dynamics require the spectral resolution of the target state, optimized coherent pulses, engineered dissipation, and feedback. As an example, we discuss the preparation of an entangled antiferromagnetic state, and argue that the procedure can be applied to chains of trapped ions or Rydberg atoms.Comment: 5 pages, 4 figure

Forecasting manpower requirements in a manufacturing group

This thesis introduces a computer-oriented system for forecasting Manpower Requirements in a manufacturing group. Included is a critical analysis of the system as it was applied in several actual manufacturing situations