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Open Access Publications from the University of California

Scholarly Works (24 results)

  • Article
Earlier Faculty Research (2010)

This study found that plug-in hybrids can significantly reduce emissions and energy consumption in urban settings where average trip distances are fairly short. The ability of plug-in hybrids to deliver environmental benefits will rely heavily on initiatives that reduce charging times and provide wider opportunities for charging outside the home. in this regard, we recommend enacting policies that 1) encourage affordable conversion from 120-volt to 240-volt charging at home and 2) provide for installation of 240-volt charging facilities at public and private parking facilities adjacent to major activity centers, like shopping malls and rail transit stations.

    Cover page: Charge It: The Promise of Plug-in Electric Hybrids
    • Article
    Faculty Research (2010)

    With the success of Hybrid Electric Vehicles (HEVs) in the automobile market, Plug-In Hybrid Electric Vehicles (PHEVs) are emerging as the next evolution of this attractive alternative. PHEV market penetration is expected to lead to lower gasoline consumption and less emission. The main objective of this research is to assess PHEVs’ energy profile impacts based on simulation of vehicles used in activity and travel patterns drawn from the 2000-2001 California Statewide Household Travel Survey. Simulations replicating reported continuous one day data are used to generate realistic energy impact assessment of PHEV market penetration.

    A secondary objective is to estimate the decreased gasoline consumption and increased electricity demand in California. This will involve testing various scenarios involving battery charging to develop policies and strategies to mitigate the recharging demands placed on the grid during periods of peak consumption.

      Cover page: An Activity-Based Assessment of the Potential Impacts of Plug-In Hybrid Electric Vehicles on Energy and Emissions Using One-Day Travel Data
      • Article
      • Peer Reviewed
      LBL Publications (2020)
        Cover page: Temperature-dependent angle-resolved photoemission spectroscopy study of the Ce 4f states in a possible topological Kondo insulator CeRhAs
        • Article
        • Peer Reviewed
        LBL Publications (2023)
        The electronic structure of CeNiSn, which is a potential topological Kondo insulator and a Dirac nodal-loop semimetal, has been investigated by employing temperature (T) dependent angle-resolved photoemission spectroscopy (ARPES). The Fermi surfaces (FSs) and the band structures of CeNiSn for three orthogonal crystallographic planes are measured, in which both the very dispersive bands and the flat bands are observed, having mainly the Ni 3d character and the Ce 4f character, respectively. The measured FSs and ARPES bands agree reasonably well with the density functional theory (DFT) calculations. The Fermi-edge (EF) photon energy (hν) map along kb (=k(010)) shows that the metallic EF-crossing states on the (010) surface have the three-dimensional character, suggesting that the observed EF-crossing metallic states do not correspond to the topological surface states of the two-dimensional character. On the other hand, albeit weak, the features of the hourglass-type bulk band crossings are observed along SXS, with the energies and the slopes being similar to those predicted by the DFT calculations, supporting the Dirac semimetallic nature of CeNiSn. In T-dependent ARPES, the Ce 4f Kondo resonance states are clearly revealed at low T, which become much suppressed above ∼80 K. This feature is consistent with the Kondo temperature of CeNiSn, estimated from its ρ(T) data. This work demonstrates the importance of the coherent Kondo states in determining the topological properties of CeNiSn.
          Cover page: Hourglass-type bulk Ni 3d band and Ce 4f Kondo resonance states in the potential topological Kondo semimetal CeNiSn via angle-resolved photoemission spectroscopy
          • Article
          • Peer Reviewed
          LBL Publications (2023)
          We provide data on daily social contact intensity of clusters of people at different types of Points of Interest (POI) by zip code in Florida and California. This data is obtained by aggregating fine-scaled details of interactions of people at the spatial resolution of 10 m, which is then normalized as a social contact index. We also provide the distribution of cluster sizes and average time spent in a cluster by POI type. This data will help researchers perform fine-scaled, privacy-preserving analysis of human interaction patterns to understand the drivers of the COVID-19 epidemic spread and mitigation. Current mobility datasets either provide coarse-level metrics of social distancing, such as radius of gyration at the county or province level, or traffic at a finer scale, neither of which is a direct measure of contacts between people. We use anonymized, de-identified, and privacy-enhanced location-based services (LBS) data from opted-in cell phone apps, suitably reweighted to correct for geographic heterogeneities, and identify clusters of people at non-sensitive public areas to estimate fine-scaled contacts.
            Cover page: Crowd cluster data in the USA for analysis of human response to COVID-19 events and policies
            • Article
            • Peer Reviewed
            UC Irvine Previously Published Works (2017)
            Applied pressure drives the heavy-fermion antiferromagnet CeRhIn5 toward a quantum critical point that becomes hidden by a dome of unconventional superconductivity. Magnetic fields suppress this superconducting dome, unveiling the quantum phase transition of local character. Here, we show that [Formula: see text] magnetic substitution at the Ce site in CeRhIn5, either by Nd or Gd, induces a zero-field magnetic instability inside the superconducting state. This magnetic state not only should have a different ordering vector than the high-field local-moment magnetic state, but it also competes with the latter, suggesting that a spin-density-wave phase is stabilized in zero field by Nd and Gd impurities, similarly to the case of Ce0.95Nd0.05CoIn5 Supported by model calculations, we attribute this spin-density wave instability to a magnetic-impurity-driven condensation of the spin excitons that form inside the unconventional superconducting state.
              Cover page: Competing magnetic orders in the superconducting state of heavy-fermion CeRhIn5.
              • Article
              • Peer Reviewed
              UC San Francisco Previously Published Works (2016)
              © 2016 Nature America, Inc. All rights reserved.High-content, image-based screens enable the identification of compounds that induce cellular responses similar to those of known drugs but through different chemical structures or targets. A central challeng
                • Article
                • Peer Reviewed
                LBL Publications (2019)
                  Cover page: Multiple topological Dirac cones in a mixed-valent Kondo semimetal: g-SmS
                  • Article
                  • Peer Reviewed
                  LBL Publications (2021)
                    Cover page: Topological surface states on the nonpolar (110) and (111) surfaces of SmB6
                    • Article
                    • Peer Reviewed
                    UC Irvine Previously Published Works (2017)
                    Applied pressure drives the heavy-fermion antiferromagnet CeRhIn5 toward a quantum critical point that becomes hidden by a dome of unconventional superconductivity. Magnetic fields suppress this superconducting dome, unveiling the quantum phase transition of local character. Here, we show that [Formula: see text] magnetic substitution at the Ce site in CeRhIn5, either by Nd or Gd, induces a zero-field magnetic instability inside the superconducting state. This magnetic state not only should have a different ordering vector than the high-field local-moment magnetic state, but it also competes with the latter, suggesting that a spin-density-wave phase is stabilized in zero field by Nd and Gd impurities, similarly to the case of Ce0.95Nd0.05CoIn5 Supported by model calculations, we attribute this spin-density wave instability to a magnetic-impurity-driven condensation of the spin excitons that form inside the unconventional superconducting state.
                      Cover page: Competing magnetic orders in the superconducting state of heavy-fermion CeRhIn5
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