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  • Author(s):
    James Zokoe, Changsheng Su, Paul J. McGinn
    Abstract:

    Potassium volatility and activity in a novel K-Ca-Si-O glass catalyst was investigated over extended periods of soot oxidation. Soot was continuously deposited and oxidized by maintaining a glass catalyst-coated filter at temperatures above the oxidation balance point to provide a soot mass equivalent to 100 000 miles of engine operation. Testing revealed the 52-SiO2, 35-K2O, and 13-CaO wt % glass catalysts show a significant improvement in soot oxidation performance over a Pt catalyst. The g…

    Date Published:
    2019-07
    Record Visibility:
    Public
  • Author(s):
    Yide Zhang, Takashi Hato, Pierre Dagher, Evan Nichols, Cody Smith, Kenneth Dunn, Scott Howard
    Abstract:

    Fluorescence lifetime imaging microscopy (FLIM) provides additional contrast for fluorophores with overlapping emission spectra. The phasor approach to FLIM greatly reduces the complexity of FLIM analysis and enables a useful image segmentation technique by selecting adjacent phasor points and labeling their corresponding pixels with different colors. This phasor labeling process, however, is empirical and could lead to biased results. In this Letter, we present a novel and unbiased approach …

    Date Published:
    2019-08
    Record Visibility:
    Public
  • Author(s):
    Kimberly Curtis, Alyssa Oberman, Glen Niebur
    Abstract:

    Bone marrow is a cellular tissue that forms within the pore space and hollow diaphysis of bones. As a tissue, its primary function is to support the hematopoietic progenitor cells that maintain the populations of both erythroid and myeloid lineage cells in the bone marrow, making it an essential element of normal mammalian physiology. However, bone’s primary function is load bearing, and deformations induced by external forces are transmitted to the encapsulatedmarrow.Understanding the effect…

    Date Published:
    2019-08
    Record Visibility:
    Public
  • Author(s):
    V. S. Buinevich, A. A. Nepapushev, G. V. Trusov, D. O. Moskovskikh, A. S. Rogachev, A. S. Mukasyan
    Abstract:

    The future of the aerospace industry is directly related to the development and modernization of the heat-loaded components of hypersonic aircraft: jet engines, nose tips and sharp leading edges of the wings, which are required to withstand ultrahigh temperatures (above 2000°C) caused by aerodynamic heating. The greatest practical interest for the aerospace industry is centered around ultra-high temperature ceramics based on borides, nitrides, carbides, carbonitrides and double transition met…

    Date Published:
    2019-01
    Record Visibility:
    Public
  • Author(s):
    Chaochao Dun, Nicholas Kempf, Mortaza Saeidi-Javash, Chinathambi Karthik, Joseph Richardson, Courtney Hollar, David Estrada, Yanliang Zhang
    Abstract:

    Printing is a versatile method to transform semiconducting nanoparticle inks into functional and flexible devices. In particular, thermoelectric nanoparticles are attractive building blocks to fabricate flexible devices for energy harvesting and cooling applications. However, the performance of printed devices are plagued by poor interfacial connections between nanoparticles and resulting low carrier mobility. While many rigid bulk materials have shown a thermoelectric figure of merit ZT grea…

    Date Published:
    2019-07
    Record Visibility:
    Public
  • Author(s):
    Jiayu Liu, Ibrahem Jasim, Muhammad Roman, Yuyao Yang, Chuang Qu, Jie Huang, Edward Kinzel, Mahmoud Almasri
    Abstract:

    This paper presents a technique for the low-cost fabrication of plasmonic fiber-optic based refractive-index sensors. The Microsphere Photolithography (MPL) technique was used to pattern nanoholes in a thin aluminum film to create Extraordinary Optical Transmission (EOT) based sensors on the cleaved tip of SMF-28 optical fibers. This technique uses self-assembled microspheres as an optical element and facilitates very low-cost patterning of the plasmonic probes. As the refractive index of the…

    Date Published:
    2019-06
    Record Visibility:
    Public
  • Author(s):
    Hunter Ford, Laura Merrill, Jennifer Schaefer
    Abstract:

    Abstract: Rechargeable magnesium sulfur (Mg/S) batteries suffer from fast capacity fading due to difficulty of reoxidation of MgS and the polysulfide shuttle. Other works have reported that use of Cu current collectors or CuS at the cathode improves cycleability. Here we investigate Cu nanoparticles grown on carbon nanofibers (Cu@CNF) as an additive for the Mg/S battery cathode to test the effects of Cu metal on capacity and rate performance at controlled Cu loading. The Mg/S battery with Cu …

    Date Published:
    2019-10
    Record Visibility:
    Public
  • Author(s):
    Margaret L. Butzen, Jeremy B. Fein
    Abstract:

    In this study, we measured the effect of EPS on Cd and proton adsorption behaviors by measuring the extent of adsorption onto biomass with and without the EPS removed via a cation exchange resin. We conducted both Cd adsorption experiments and potentiometric titrations of biomass using three common bacterial species: one Gram-positive (Bacillus subtilis) and two Gram-negative (Shewanella oneidensis, Pseudomonas putida) species. The Cd adsorption experiments were con- ducted as a function of m…

    Date Published:
    2019-01
    Record Visibility:
    Public
  • Author(s):
    Douglas Shoue, Brianna Norris-Mulliins, Bruce Melancon, Miguel A. Morales, Mary Ann McDowell
    Abstract:

    Leishmania parasites are the causative agents of a wide spectrum of human diseases. The clinical mani- festations of leishmaniasis range from self-healing skin lesions to fatality. The World Health Organization has classed leishmaniasis as a category 1 neglected tropical disease. Leishmaniasis represents a major international health challenge, affecting 12 million people per year and with nearly 310 million people at risk. The first-line chemotherapies used to treat leishmaniasis are intraven…

    Date Published:
    2019-07
    Record Visibility:
    Public
  • Author(s):
    Eveline Rigo, Zhuxin Dong, Jae Hyun Park, Eamonn Kennedy, Mohammad Hokmabadi, Lisa Almonte-Garcia, Li Ding, Narayana Aluru, Gregory Timp
    Abstract:

    The size of an ion affects everything from the structure of water to life itself. In this report, to gauge their size, ions dissolved in water are forced electrically through a sub-nanometer- diameter pore spanning a thin membrane and the current is measured. The measurements reveal an ion-selective conductance that vanishes in poresThe size of an ion affects everything from the structure of water to life itself. In this report, to gauge their size, ions dissolved in water are forced electric…

    Date Published:
    2019-05
    Record Visibility:
    Public
  • Author(s):
    Muhammad Ahmad, Chao Tang, Liu Yang, Andriy Yaroshchuk, Merlin Bruening
    Abstract:

    Development of anion-exchange membranes (AEMs) with selectivities among anions may expand the applications of these membranes in salt separations. This work shows that layer-by-layer coating of aliphatic polyamide AEMs with poly(4-styrenesulfonate) (PSS)/protonated poly(allylamine) (PAH) films enhances Cl − /SO 42− dialysis selectivities, and the extent of this enhancement depends on the source-phase salt concentrations. For a source phase containing 0.01 M NaCl and 0.01 M Na 2 SO 4 and a rec…

    Date Published:
    2019-02
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    Public
  • Author(s):
    Chinedu Madukoma, Shusuke Tomoshige, Choonkeun Kim, Elan Lastochkin, William C. Boggess, Jed Fisher, Joshua Shrout, Shahriar Mobashery
    Abstract:

    The interplay between the activities of lytic transglycosylases (LTs) and penicillin-binding proteins (PBPs) is critical for the health of the bacterial cell wall. Bulgecin A (a natural-product inhibitor of LTs) potentiates the activity of β-lactam antibiotics (inhibitors of PBPs), underscoring this intimate mechanistic interdependence. Bulgecin A in the presence of an appropriate β-lactam causes bulge deformation due to the formation of aberrant peptidoglycan at the division site of the bact…

    Date Published:
    2019-01
    Record Visibility:
    Public