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  • 2015-2019  (260)
  • 1935-1939  (1)
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  • 1
    Publication Date: 2015-03-22
    Description: Knowledge of the plasma fluxes at geosynchronous orbit is important to both scientific and operational investigations. We present a new empirical model of the ion flux and the electron flux at geosynchronous orbit (GEO) in the energy range ~1 eV to ~40 keV. The model is based on a total of 82 satellite-years of observations from the Magnetospheric Plasma Analyzer instruments on Los Alamos National Laboratory satellites at GEO. These data are assigned to a fixed grid of 24 local-times and 40 energies, at all possible values of Kp. Bi-linear interpolation is used between grid points to provide the ion flux and the electron flux values at any energy and local-time, and for given values of geomagnetic activity (proxied by the 3-hour Kp index), and also for given values of solar activity (proxied by the daily F10.7 index). Initial comparison of the electron flux from the model with data from a Compact Environmental Anomaly Sensor II (CEASE-II), also located at geosynchronous orbit, indicate a good match during both quiet and disturbed periods. The model is available for distribution as a FORTRAN code that can be modified to suit user-requirements.
    Print ISSN: 1539-4964
    Electronic ISSN: 1542-7390
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 2
    Publication Date: 2018-02-22
    Description: This paper investigates the potential for 83.4 nm imaging of the plasmaspheric dense oxygen torus, using simple models for core plasma density and composition to constrain a simulated image code. We derive the requirements for plasmaspheric O + imaging, and the expected performance of an imager based on a slightly modified version of the IMAGE EUV camera. We find that such an imager can achieve a sensitivity of 0.69(sRpixel) −1 , sufficient to capture the dense torus 83.4 nm signal with 25-min integration time. The background rejection ratios for this design are 1.5 × 10 −4 at 58.4 nm and 7.4 × 10 −8 for Lyman- α . We discuss the effects of ion temperature and motion, and O ++ glow. We compute simulated O + images of the formation and global distribution of the dense torus. We also examine the possibility of direct observation of oxygen outflow from the ionosphere.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 3
    Publication Date: 2018-03-26
    Description: This paper investigates the potential for 83.4 nm imaging of the plasmaspheric dense oxygen torus, using simple models for core plasma density and composition to constrain a simulated image code. We derive the requirements for plasmaspheric O + imaging, and the expected performance of an imager based on a slightly modified version of the IMAGE extreme ultraviolet camera. We find that such an imager can achieve a sensitivity of 0.69(s R pixel) −1 , sufficient to capture the dense torus 83.4 nm signal with 25 min integration time. The background rejection ratios for this design are 1.5 × 10 −4 at 58.4 nm and 7.4 × 10 −8 for Lyman-α. We discuss the effects of ion temperature and motion, and O ++ glow. We compute simulated O + images of the formation and global distribution of the dense torus. We also examine the possibility of direct observation of oxygen outflow from the ionosphere. ©2018. American Geophysical Union. All Rights Reserved.
    Print ISSN: 2169-9380
    Electronic ISSN: 2169-9402
    Topics: Geosciences , Physics
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  • 4
    Publication Date: 2015-04-01
    Print ISSN: 1542-7390
    Electronic ISSN: 1542-7390
    Topics: Geosciences , Physics
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 59 (1937), S. 1387-1388 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
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    Hamilton (Ontario): McMaster University, Research Institute for Quantitative Studies in Economics and Population (QSEP)
    Publication Date: 2018-08-07
    Description: Immigration is a possible instrument for offsetting longer-run adverse effects of population aging on per capita income. Our "laboratory" is a fictional country Alpha to which we assign demographic characteristics typical of a country experiencing population aging. Simulations indicate that a very high immigration rate with heavy concentration in younger working ages might be required to keep per capita income from declining. More rapid productivity growth would also offset population aging as would higher rates of labour participation of older people. Longer life expectancy, taken alone, would lower per capita real income, as would higher fertility rates.
    Keywords: J10 ; J11 ; J18 ; ddc:330 ; immigration ; per capita income ; population aging ; age structure ; simulation
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:workingPaper
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  • 7
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    Hamilton (Ontario): McMaster University, Research Institute for Quantitative Studies in Economics and Population (QSEP)
    Publication Date: 2018-08-07
    Description: A shift in population distribution toward older ages is underway in industrialised countries throughout the world and will continue well into the future. We provide a framework for isolating the pure effects of population aging on per capita GDP, employ the framework in calculations for twenty OECD countries, and derive the rates of productivity growth required to offset those effects. We consider also some labour-related changes that might provide offsets, for comparison with productivity.
    Keywords: J1 ; J11 ; O4 ; ddc:330 ; population aging ; productivity ; industrialised countries ; projections
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:workingPaper
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  • 8
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    Hamilton (Ontario): McMaster University, Research Institute for Quantitative Studies in Economics and Population (QSEP)
    Publication Date: 2018-08-07
    Description: We consider optional TOU (time-of-use) pricing for residential consumers as an alternative to a single TOU or flat rate structure offered by a publicly regulated electricity supplier. A general equilibrium model is developed and used to explore and quantify the effects of optional pricing on welfare, consumption, and production costs. The model assumes that households can be classified into internally homogeneous groups with differing utility functions, incomes, demand elasticities, and committed consumption requirements. Substitution for electricity among TOU periods and between electricity and other goods is allowed for in the model on the demand side, and differing TOU-specific marginal costs on the supply side. The supplier in the model offers to each household a menu of possible rate sets obtained by maximizing a collective welfare function subject to three types of restriction: Pareto efficiency (no household is worse off under the proposed pricing scheme than under the current pricing scheme); incentive compatibility (every household weakly prefers its set of rates to the sets chosen by other households); breakeven supplier revenue (aggregate revenue must equal aggregate cost). The model is calibrated realistically with three household groups and three distinct TOU costing periods, and used in a series of simulation experiments, including experiments with alternative demand elasticities and marginal cost parameters. The use of optional pricing is shown to increase overall consumer welfare and reduce average production cost. However, the distribution of welfare effects can be uneven, with the highest income group dominating the market to the relative disadvantage of the lowest group. To deal with that situation an alternative strategy with a targeted rate structure for the lowest income group is proposed, corresponding to a modified version of the model specified in which some incentive compatibility restrictions are relaxed. Simulations show that the strategy can be effective in bringing about a more equitable distribution of welfare gains while still maintaining optional TOU pricing.
    Keywords: D11 ; D12 ; D82 ; Q41 ; D58 ; D61 ; L94 ; ddc:330 ; Optional Differentiated Time-of-Use Rates ; Pareto Efficiency ; Incentive Compatibility ; Welfare Benefits ; General Equilibrium ; Electricity Utility ; Consumer Demand
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:workingPaper
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  • 9
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    Hamilton (Ontario): McMaster University, Research Institute for Quantitative Studies in Economics and Population (QSEP)
    Publication Date: 2018-08-07
    Description: Immigrants can mix with the population of a receiving country in various ways. We consider demographic mixing by which we mean cross-mating, and more particularly the bearing of children where one parent is of immigrant descent and the other is not - cross-parenting as we term it. We consider a hypothetical country with an initial stable population and introduce immigration. The results of cross-parenting are taken into account by identifying three separate populations within the overall total: non-immigrant population, immigrant population (immigrants and their descendants), and mixed population. We develop a stylized model to track the three populations, with interest focusing in particular on how the proportion of mixed population changes through time as it moves toward a steady state. The model has a stable projection (Leslie) matrix that holds for all three populations and moves them forward from generation to generation as each evolves in its own way. As cross-parenting occurs the resulting progeny are transferred from the other populations to the mixed population. The pattern of cross-parenting is determined in the first instance by a matrix representing preferences among the three populations and alternative preferential patterns are experimented with, ranging from complete isolation to indifference as to cross-parenting choices. However the matrix must be modified to recognize supply constraints imposed by the sizes of the available populations and a restricted least-squares procedure is employed to effect the modification while remaining as close as possible to the original preference pattern. Alternative rates of immigration are experimented with also.
    Keywords: F22 ; ddc:330 ; immigration ; population mixing ; cross-parenting ; demographic modeling ; parenting preferences
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:workingPaper
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  • 10
    Publication Date: 2016-04-25
    Description: Waverider buoy data are normally transmitted on a 27 MHz analog radio link to a shore station a few miles away, where the buoy data are plotted on a paper strip-chart recorder or logged digitally for later computer processing. Instead, we have constructed a relay station on Martha's Vineyard island that retransmits the received Waverider data over a digital, 148 MHz packet-radio link to a personal computer in our laboratory on Cape Cod, where the data are edited, processed, spectrally analyzed, and then sent over an Ethernet line to our Institution mainframe computer for archiving. Telephone modem access of a special wave-data file on the mainframe permits unattended data dissemination to the public. The report describes the entire system, including Waverider buoy mooring hardware, computer programs, and equipment. The purpose of the project was to learn what difficulties are involved in the automated acquisition and dissemination of telemetered oceanographic data, and to gain experience with packet radio techniques. Although secondary to these purposes, the long-term surface-wave monitoring off the southwest shore of Martha's Vineyard has its own scientific, engineering, and environmental benefits.
    Description: Funding was provided by the Office of Naval Research through contract Number N00014-86-K-0715 under the University Research Initiative Program.
    Keywords: Radio frequency ; Packet transmission
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
    Format: application/pdf
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