Now showing items 1-20 of 4535

    • A quantitative assessment of the model form error of friction models across different interface representations for jointed structures 

      Porter, Justin H.; Balaji, Nidish Narayanaa; Little, Clayton R.; Brake, Matthew R.W. (2022)
      Hysteretic models are widely used to model frictional interactions in joints to recreate experimental behavior. However, it is unclear which models are best suited for fitting or predicting the responses of structures. The present study evaluates 26 friction model/interface representation combinations to quantify the model form error. A Quasi-Static ...
    • Measurement and identification of the nonlinear dynamics of a jointed structure using full-field data; Part II - Nonlinear system identification 

      Jin, Mengshi; Kosova, Giancarlo; Cenedese, Mattia; Chen, Wei; Singh, Aryan; (2022)
      The dynamic responses of assembled structures are greatly affected by the mechanical joints, which are often the cause of nonlinear behavior. To better understand and, in the future, tailor the nonlinearities, accurate methods are needed to characterize the dynamic properties of jointed structures. In this paper, the nonlinear characteristics of a ...
    • Measurement and identification of the nonlinear dynamics of a jointed structure using full-field data, Part I: Measurement of nonlinear dynamics 

      Chen, Wei; Jana, Debasish; Singh, Aryan; Jin, Mengshi; Cenedese, Mattia; (2022)
      Jointed structures are ubiquitous constituents of engineering systems; however, their dynamic properties (e.g., natural frequencies and damping ratios) are challenging to identify correctly due to the complex, nonlinear nature of interfaces. This research seeks to extend the efficacy of traditional experimental methods for linear system identification ...
    • Apportioned primary and secondary organic aerosol during pollution events of DISCOVER-AQ Houston 

      Yoon, Subin; Ortiz, Stephanie M.; Clark, Adelaide E.; Barrett, Tate E.; Usenko, Sascha; (2021)
      Understanding the drivers for high ozone (O3) and atmospheric particulate matter (PM) concentrations is a pressing issue in urban air quality, as this understanding informs decisions for control and mitigation of these key pollutants. The Houston, TX metropolitan area is an ideal location for studying the intersection between O3 and atmospheric ...
    • Reduced order modeling for the dynamics of jointed structures through hyper-reduced interface representation 

      Balaji, Nidish Narayanaa; Dreher, Tobias; Krack, Malte; Brake, Matthew R.W. (2021)
      One strategy to develop both accurate and computationally tractable models of jointed structures is reduced order modeling through hyper-reduced representations of the interfaces in contact. Hyper reduction refers to reduction techniques that result in a Reduced Order Model (ROM) that is complete by itself, i.e., all displacements and forces are fully ...
    • A VKORC1‐based SNP survey of anticoagulant rodenticide resistance in the house mouse, Norway rat and roof rat in the USA 

      Diaz, Juan C.; Kohn, Michael H. (2021)
      BACKGROUND: We conducted a vitamin K epoxide reductase subcomponent 1 (Vkorc1)‐based nonsynonymous Single Nucleotide Polymorphism (nsSNP) screen with focus on the house mouse (Mus musculus domesticus), but that also considered the Norway rat (Rattus norvegicus) and roof rat (R. rattus) in the USA. RESULTS: We detected six Vkorc1 nsSNPs underlying the ...
    • Water cost savings from soil biochar amendment: A spatial analysis 

      Kroeger, Jennifer E.; Pourhashem, Ghasideh; Medlock, Kenneth B.; Masiello, Caroline A.; Baker Institute for Public Policy (2021)
      While a large body of literature exists on the ability of biochar to retain water and nutrients, little research exists connecting these benefits to biochar qualities, water retention mechanisms, and optimal locations for agricultural use. More information is needed for biochar stakeholders to make informed decisions about where deployment should ...
    • Hierarchical Assemblies of Superparamagnetic Colloids in Time-Varying Magnetic Fields 

      Spatafora-Salazar, Ald; Lobmeyer, Dana; da Cunha, Lucas Hildebrand Pires; Joshi, Kedar; Biswal, Sibani Lisa (2021)
      Magnetically-guided colloidal assembly has proven to be a versatile method for building hierarchical particle assemblies. This review describes the dipolar interactions that govern superparamagnetic colloids in time-varying magnetic fields, and how such interactions have guided colloidal assembly into materials with increasing complexity that display ...
    • Long-distance in-situ methane detection using near-infrared light-induced thermo-elastic spectroscopy 

      Hu, Lien; Zheng, Chuantao; Zhang, Minghui; Zheng, Kaiyuan; Zheng, Jie; (2021)
      A wavelength-locked light-induced thermo-elastic spectroscopy (WL-LITES) gas sensor system was proposed for long-distance in-situ methane (CH4) detection using a fiber-coupled sensing probe. The wavelength-locked scheme was used to speed the sensor response without scanning the laser wavelength across the CH4 absorption line. A small-size piezoelectric ...
    • An In Vitro Cell Culture Model for Pyoverdine-Mediated Virulence 

      Kang, Donghoon; Kirienko, Natalia V. (2021)
      Pseudomonas aeruginosa is a multidrug-resistant, opportunistic pathogen that utilizes a wide-range of virulence factors to cause acute, life-threatening infections in immunocompromised patients, especially those in intensive care units. It also causes debilitating chronic infections that shorten lives and worsen the quality of life for cystic fibrosis ...
    • Discrete-state stochastic kinetic models for target DNA search by proteins: Theory and experimental applications 

      Iwahara, Junji; Kolomeisky, Anatoly B.; Center for Theoretical Biological Physics (2021)
      To perform their functions, transcription factors and DNA-repair/modifying enzymes randomly search DNA in order to locate their specific targets on DNA. Discrete-state stochastic kinetic models have been developed to explain how the efficiency of the search process is influenced by the molecular properties of proteins and DNA as well as by other ...
    • Multidimensional Schrödinger operators whose spectrum features a half-line and a Cantor set 

      Damanik, David; Fillman, Jake; Gorodetski, Anton (2021)
      We construct multidimensional Schrödinger operators with a spectrum that has no gaps at high energies and that is nowhere dense at low energies. This gives the first example for which this widely expected topological structure of the spectrum in the class of uniformly recurrent Schrödinger operators, namely the coexistence of a half-line and a ...
    • Search for top squark pair production using dilepton final states in pp collision data collected at s√=13TeV 

      CMS collaboration (2021)
      A search is presented for supersymmetric partners of the top quark (top squarks) in final states with two oppositely charged leptons (electrons or muons), jets identified as originating from bquarks, and missing transverse momentum. The search uses data from proton-proton collisions at s√=13TeV collected with the CMS detector, corresponding to an ...
    • Multiorbital singlet pairing and d + d superconductivity 

      Nica, Emilian M.; Si, Qimiao; Rice Center for Quantum Materials (2021)
      Recent experiments in multiband Fe-based and heavy-fermion superconductors have challenged the long-held dichotomy between simple s- and d-wave spin-singlet pairing states. Here, we advance several time-reversal-invariant irreducible pairings that go beyond the standard singlet functions through a matrix structure in the band/orbital space, and ...
    • Systematic analysis of video-based pulse measurement from compressed videos 

      Nowara, Ewa M.; McDuff, Daniel; Veeraraghavan, Ashok (2021)
      Camera-based physiological measurement enables vital signs to be captured unobtrusively without contact with the body. Remote, or imaging, photoplethysmography involves recovering peripheral blood flow from subtle variations in video pixel intensities. While the pulse signal might be easy to obtain from high quality uncompressed videos, the signal-to-noise ...
    • Managing teamwork in the face of pandemic: evidence-based tips 

      Tannenbaum, Scott I.; Traylor, Allison M.; Thomas, Eric J.; Salas, Eduardo (2021)
    • Mechanical Reshaping of Inorganic Nanostructures with Weak Nanoscale Forces 

      Rehn, Sarah M.; Gerrard-Anderson, Theodor M.; Qiao, Liang; Zhu, Qing; Wehmeyer, Geoff; (2021)
      Inorganic nanomaterials are often depicted as rigid structures whose shape is permanent. However, forces that are ordinarily considered weak can exert sufficient stress at the nanoscale to drive mechanical deformation. Here, we leverage van der Waals (VdW) interactions to mechanically reshape inorganic nanostructures from planar to curvilinear. ...
    • Gene expression profiles of inflammatory breast cancer reveal high heterogeneity across the epithelial-hybrid-mesenchymal spectrum 

      Chakraborty, Priyanka; George, Jason T; Woodward, Wendy A; Levine, Herbert; Jolly, Mohit Kumar; (2021)
      Inflammatory breast cancer (IBC) is a highly aggressive breast cancer that metastasizes largely via tumor emboli, and has a 5-year survival rate of less than 30%. No unique genomic signature has yet been identified for IBC nor has any specific molecular therapeutic been developed to manage the disease. Thus, identifying gene expression signatures ...
    • Design of prestressed gridshells as smooth poly-hypar surface structures 

      Cao, Ting; D'Acunto, Pierluigi; Castellón, Juan José; Tellini, TelliniAlessandro; Schwartz, Joseph; (2021)
      This article demonstrates the design potentials of a recently developed approach for generating smooth poly-hypar surfaces, freeform surfaces made of combinations of hyperbolic paraboloids (hypars). In a smooth poly-hypar surface, the double curvature of the individual hypar modules and the smooth connections between them ensure global bending-free ...
    • A framework to identify structured behavioral patterns within rodent spatial trajectories 

      Donnarumma, Francesco; Prevete, Roberto; Maisto, Domenico; Fuscone, Simone; Irvine, Emily M.; (2021)
      Animal behavior is highly structured. Yet, structured behavioral patterns—or “statistical ethograms”—are not immediately apparent from the full spatiotemporal data that behavioral scientists usually collect. Here, we introduce a framework to quantitatively characterize rodent behavior during spatial (e.g., maze) navigation, in terms of movement ...