3,435 research outputs found
Offsetting of CO₂ emissions by air capture in mine tailings at the Mount Keith Nickel Mine, Western Australia: Rates, controls and prospects for carbon neutral mining
The hydrated Mg-carbonate mineral, hydromagnesite [Mg₅(CO₃)₄(OH)₂•4H₂O], precipitates within mine tailings at the Mount Keith Nickel Mine, Western Australia as a direct result of mining operations. We have used quantitative mineralogical data and δ¹³C, δ¹⁸O and F¹⁴C isotopic data to quantify the amount of CO₂fixation and identify carbon sources. Our radiocarbon results indicate that at least 80% of carbon stored in hydromagnesite has been captured from the modern atmosphere. Stable isotopic results indicate that dissolution of atmospheric CO₂ into mine tailings water is kinetically limited, which suggests that the current rate of carbon mineralization could be accelerated. Reactive transport modeling is used to describe the observed variation in tailings mineralogy and to estimate rates of CO₂ fixation. Based on our assessment, approximately 39,800 t/yr of atmospheric CO₂ are being trapped and stored in tailings at Mount Keith. This represents an offsetting of approximately 11% of the mine's annual greenhouse gas emissions. Thus, passive sequestration via enhanced weathering of mineral waste can capture and store a significant amount of CO₂. Recommendations are made for changes to tailings management and ore processing practices that have potential to accelerate carbonation of tailings and further reduce or completely offset the net greenhouse gas emissions at Mount Keith and many other mines
Radio Spectral Index Analysis and Classes of Ejection in LS I +61 303
LS I +61303 is a gamma-ray binary with periodic radio outbursts coincident
with the orbital period of P=26.5 d. The origin of the radio emission is
unclear,it could be due either to a jet, as in microquasars, or to the shock
boundary between the Be star and a possible pulsar wind. We here analyze the
radio spectral index over 6.7 yr from Green Bank Interferometer data at 2.2 GHz
and 8.3 GHz. We find two new characteristics in the radio emission. The first
characteristic is that the periodic outbursts indeed consist of two consecutive
outbursts; the first outburst is optically thick, whereas the second outburst
is optically thin. The spectrum of LS I +61 303 is well reproduced by the
shock-in-jet model commonly used in the context of microquasars and AGNs: the
optically thin spectrum is due to shocks caused by relativistic plasma
("transient jet") traveling through a pre-existing much slower steady flow
("steady jet"). This steady flow is responsible for the preceding optically
thick spectrum. The second characteristic we find is that the observed spectral
evolution, from optically thick to optically thin emission, occurs twice during
the orbital period. We observed this occurrence at the orbital phase of the
main 26.5 d outburst and also at an earlier phase, shifted by 0.3 (i.e almost 8 days before). We show that this result qualitatively
and quantitatively agrees with the two-peak accretion/ejection model proposed
in the past for LS I +61303. We conclude that the radio emission in LS I +61303
originates from a jet and suggest that the variable TeV emission comes from the
usual Compton losses expected as an important by-product in the shock-in-jet
theory.Comment: 27 pages, 7 figures, accepted for publication in Ap
Multilayer Electroactive Polymer Composite Material
An electroactive material comprises multiple layers of electroactive composite with each layer having unique dielectric, electrical and mechanical properties that define an electromechanical operation thereof when affected by an external stimulus. For example, each layer can be (i) a 2-phase composite made from a polymer with polarizable moieties and an effective amount of carbon nanotubes incorporated in the polymer for a predetermined electromechanical operation, or (ii) a 3-phase composite having the elements of the 2-phase composite and further including a third component of micro-sized to nano-sized particles of an electroactive ceramic incorporated in the polymer matrix
Sensing/actuating materials made from carbon nanotube polymer composites and methods for making same
An electroactive sensing or actuating material comprises a composite made from a polymer with polarizable moieties and an effective amount of carbon nanotubes incorporated in the polymer for a predetermined electromechanical operation of the composite when such composite is affected by an external stimulus. In another embodiment, the composite comprises a third component of micro-sized to nano-sized particles of an electroactive ceramic that is also incorporated in the polymer matrix. The method for making the three-phase composite comprises either incorporating the carbon nanotubes in the polymer matrix before incorporation of the particles of ceramic or mixing the carbon nanotubes and particles of ceramic together in a solution before incorporation in the polymer matrix
Multilayer Electroactive Polymer Composite Material Comprising Carbon Nanotubes
An electroactive material comprises multiple layers of electroactive composite with each layer having unique dielectric, electrical and mechanical properties that define an electromechanical operation thereof when affected by an external stimulus. For example, each layer can be (i) a 2-phase composite made from a polymer with polarizable moieties and an effective amount of carbon nanotubes incorporated in the polymer for a predetermined electromechanical operation, or (ii) a 3-phase composite having the elements of the 2-phase composite and further including a third component of micro-sized to nano-sized particles of an electroactive ceramic incorporated in the polymer matrix
Method of Making an Electroactive Sensing/Actuating Material for Carbon Nanotube Polymer Composite
An electroactive sensing or actuating material comprises a composite made from a polymer with polarizable moieties and an effective amount of carbon nanotubes incorporated in the polymer for a predetermined electromechanical operation of the composite when such composite is affected by an external stimulus. In another embodiment, the composite comprises a, third component of micro -sized to nano-sized particles of an electroactive ceramic that is also incorporated in the polymer matrix. The method for making the three-phase composite comprises either incorporating the carbon nanotubes in the polymer matrix before incorporation of the particles of ceramic or mixing the carbon nanotubes and particles of ceramic together in a solution before incorporation in the polymer matrix
Long Term X-ray Monitoring Of The TeV Binary LS I +61 303 with RXTE
We report on the results of a long term X-ray monitoring campaign of the
galactic binary LS I +61 303 performed by the Rossi X-ray Timing Explorer. This
dataset consists of 1 ks pointings taken every other day between 2007 August 28
until 2008 February 2. The observations covered six full cycles of the 26.496
day binary period and constitute the largest continuous X-ray monitoring
dataset on LS I +61 303 to date with this sensitivity. There is no
statistically strong detection of modulation of flux or photon index with
orbital phase; however, we do find a strong correlation between flux and photon
index, with the spectrum becoming harder at higher fluxes. The dataset contains
three large flaring episodes, the largest of these reaching a flux level of 7.2
(+0.1,-0.2)*10^-11 erg cm^-2 s^-1 in the 3-10 keV band, which is a factor of
three times larger than flux levels typically seen in the system. Analysis of
these flares shows the X-ray emission from LS I +61 303 changing by up to a
factor of six over timescales of several hundred seconds as well as doubling
times as fast as 2 seconds. This is the fastest variability ever observed from
LS I +61 303 at this wavelength and places constraints on the size of the X-ray
emitting region.Comment: 24 pages, 7 figures, 2 tables. Accepted for publication in Ap
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