ERA

Journal Articles & Research Abstracts (Helmholtz-Alberta Initiative)

These are peer-reviewed articles and abstracts that can be openly shared according to publisher policies. The research was funded in part by the Helmholtz-Alberta Initiative, which is an independent international research partnership that effectively amalgamates the scientific and technical expertise of the Helmholtz Association of German Research Centres and the University of Alberta to jointly develop solutions to key challenges in fields such as energy, ecosystem and resource informatics, and health.
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  1. Discrete Element Modeling of Stick-Slip Instability and Induced Microseismicity [Download]

    Title: Discrete Element Modeling of Stick-Slip Instability and Induced Microseismicity
    Creator: Khazaei, Cyrus
    Description: Using Particle Flow Code (PFC3D), a discrete element model is presented in this paper that allows direct modeling of stick-slip behavior in pre-existing weak planes such as joints, beddings and faults. The model is used to simulate a biaxial sliding experiment from literature on a saw-cut specimen of Sierra granite with a single fault. The fault is represented by Smooth Joint Contact Model. Also, an algorithm is developed to record the stick-slip induced microseismic events along the fault. Once the results compared well with laboratory data, a parametric study has been conducted to investigate the evolution of model’s behavior due to varying factors such as resolution of the model, particles’ elasticity, fault’s coefficient of friction, fault’s stiffness and normal stress. The results show a decrease in shear strength of the fault in the models with smaller particles, smaller coefficient of friction of the fault, harder surrounding of the fault, softer faults and smaller normal stress on the fault. Also, a higher rate of displacements was observed for conditions resulting in smaller shear strength. An increase in b-values was observed by increasing the resolution or decreasing the normal stress on the fault while b-values were not sensitive to changes in elasticity of the fault or its surrounding. A larger number of recorded events were observed for the models with finer particles, smaller fault's coefficient of friction, harder fault’s surrounding, harder fault and smaller normal stress on the fault. The results suggest that it is possible for the two ends of a fault to be still while there are patches along the fault undergoing stick-slips. Such local stick-slips seem to provide a softer surrounding for their neighbour patches facilitating their subsequent stick-slips.
    Subjects: Keywords: Stick-slip, Particle Flow Code (PFC), Microseismic, Fault Instability
  2. Adsorptive drying of CO2 using low grade heat and humid, ambient air. [Download]

    Title: Adsorptive drying of CO2 using low grade heat and humid, ambient air.
    Creator: Tanchuk, B.
    Subjects: zeolites, ets-10, gas drying, adsorption, carbon dioxide
    Date Created: 2013
  3. Amine-functionalization of the nanotitanate ETS-2 [Download]

    Title: Amine-functionalization of the nanotitanate ETS-2
    Creator: Tanchuk, B.
    Subjects: engelhard titanosilicate 2, nonporous, carbon dioxide, amine grafting, adsorption
    Date Created: 2013
  4. Breakthrough performances of metal-exchanged nanotitanate ETS-2 adsorbents for room temperature desulfurization [Download]

    Title: Breakthrough performances of metal-exchanged nanotitanate ETS-2 adsorbents for room temperature desulfurization
    Creator: Rezaei, S.
    Subjects: titanosilicate ets-2, cation exchange, room temperature desulphurization, adsorption
    Date Created: 2015
  5. Damage quantification of intact rocks using acoustic emission energies recorded during uniaxial compression test and discrete element modeling [Download]

    Title: Damage quantification of intact rocks using acoustic emission energies recorded during uniaxial compression test and discrete element modeling
    Creator: Khazaei, C.
    Subjects: uniaxial compression test, acoustic emission, damage quantification, intact rock, particle flow code (pfc3d)
    Date Created: 2015
  6. Indirect and direct microwave regeneration of na-ETS-10 [Download]

    Title: Indirect and direct microwave regeneration of na-ETS-10
    Creator: Chowdhury, T
    Subjects: water, zeolites, desorption, separations, na-ets-10, microwave
    Date Created: 2013
  7. Development of connected permeability in massive crystalline rocks through hydraulic fracture propagation and shearing accompanying fluid injection [Download]

    Title: Development of connected permeability in massive crystalline rocks through hydraulic fracture propagation and shearing accompanying fluid injection
    Creator: Preisig, G.
    Subjects: hard rocks, stress transfer, numerical modeling, shearing, fracture network, permeability, reservoir enhancement, hydraulic fracturing
    Date Created: 2015
  8. Depth of root placement, root size and carbon reserves determine reproduction success of aspen root fragments [Download]

    Title: Depth of root placement, root size and carbon reserves determine reproduction success of aspen root fragments
    Creator: Wachowski, J.
    Subjects: leaf area, sucker initiation, soil temperature, forest reclamation, populus tremuloides, vegetative regeneration
    Date Created: 2014
  9. Effects of canopy-deposition interaction on H(+) supply to soils in Pinus banksiana and Populus tremuloides ecosystems in the Athabasca oil sands region in Alberta, Canada [Download]

    Title: Effects of canopy-deposition interaction on H(+) supply to soils in Pinus banksiana and Populus tremuloides ecosystems in the Athabasca oil sands region in Alberta, Canada
    Creator: Jung, K.
    Subjects: acid deposition, through fall, soil acidification, canopy budget mode, canopy leaching
    Date Created: 2011
  10. Thermal excitation of plasmons for near-field thermophotovoltaics [Download]

    Title: Thermal excitation of plasmons for near-field thermophotovoltaics
    Creator: Guo, Y.
    Subjects: walled carbon nanotubes, efficiency, metamaterials, polaritons, systems, light, emission, surface-plasmons, emitter, generation
    Date Created: 2014