Now showing items 4965-4984 of 5065

    • Vacuum Bloch–Siegert shift in Landau polaritons with ultra-high cooperativity 

      Li, Xinwei; Bamba, Motoaki; Zhang, Qi; Fallahi, Saeed; Gardner, Geoff C.; (2018)
      A two-level system resonantly interacting with an a.c. magnetic or electric field constitutes the physical basis of diverse phenomena and technologies. However, Schrödinger’s equation for this seemingly simple system can be solved exactly only under the rotating-wave approximation, which neglects the counter-rotating field component. When the a.c. ...
    • Validating the Rice neural network and the Wing Kp real-time models 

      (2014)
      The Rice neural network models of Kp have been running in real time at http://mms.rice.edu/realtime/forecast.html since October 2007; Dst and AE models were added to our operations in May 2010. All these models use the Boyle index as basis functions computed from ACE real time inputs. Later, two more driving functions were included in November 2012: ...
    • Validation of Cardiorespiratory Fitness Measurements in Adolescents 

      Migliano, Pedro; Kabiri, Laura S.; Cross, Megan; Butcher, Allison; Frugé, Amy; (2019)
      Cardiorespiratory fitness (CRF) is an important indicator of adolescent cardiovascular well-being and future cardiometabolic health but not always feasible to measure. The purpose of this study was to estimate the concurrent validity of the non-exercise test (NET) for adolescents against the Progressive Aerobic Capacity Endurance Run (PACER®) and ...
    • Valley trion dynamics in monolayerᅠMoSe2 

      Gao, Feng; Gong, Yongji; Titze, Michael; Almeida, Raybel; Ajayan, Pulickel M.; (2016)
      Charged excitons called trions play an important role in the fundamental valley dynamics in newly emerging two-dimensional semiconductor materials. We use ultrafast pump-probe spectroscopy to study the valley trion dynamics in aᅠMoSe2ᅠmonolayer grown by using chemical vapor deposition. The dynamics displays an ultrafast trion formation followed by a ...
    • The Value of Achievements 

      Bradford, Gwen (2013)
      This article gives an account of what makes achievements valuable. Although the natural thought is that achievements are valuable because of the product, such as a cure for cancer or a work of art, I argue that the value of the product of an achievement is not sufficient to account for its overall value. Rather, I argue that achievements are valuable ...
    • Valuing the Air Quality Effects of Biochar Reductions on Soil NO Emissions 

      Pourhashem, Ghasideh; Rasool, Quazi Z.; Zhang, Rui; Medlock, Kenneth B.; Cohan, Daniel S.; (2017)
      While it is clear that biochar can alter soil N2O emissions, data on NO impacts are scarce. Reports range from 0 to 67% soil NO emission reductions postbiochar amendment. We use regional air quality and health cost models to assess how these soil NO reductions could influence U.S. air quality and health costs. We find that at 67% soil NO reduction, ...
    • Van Allen Probes Observations of Second Harmonic Poloidal Standing Alfvén Waves 

      Takahashi, Kazue; Oimatsu, Satoshi; Nosé, Masahito; Min, Kyungguk; Claudepierre, Seth G.; (2018)
      Long-lasting second-harmonic poloidal standing Alfvén waves (P2 waves) were observed by the twin Van Allen Probes (Radiation Belt Storm Probes, or RBSP) spacecraft in the noon sector of the plasmasphere, when the spacecraft were close to the magnetic equator and had a small azimuthal separation. Oscillations of proton fluxes at the wave frequency ...
    • Van der Waals coefficients beyond the classical shell model 

      Tao, Jianmin; Fang, Yuan; Hao, Pan; Scuseria, G.E.; Ruzsinszky, Adrienn; (2015)
      Van der Waals (vdW) coefficients can be accurately generated and understood by modelling the dynamic multipole polarizability of each interacting object. Accurate static polarizabilities are the key to accurate dynamic polarizabilities and vdW coefficients. In this work, we present and study in detail a hollow-sphere model for the dynamic ...
    • A variable DNA recognition site organization establishes the LiaR-mediated cell envelope stress response of enterococci to daptomycin 

      (2015)
      LiaR is a ‘master regulator’ of the cell envelope stress response in enterococci and many other Gram-positive organisms. Mutations to liaR can lead to antibiotic resistance to a variety of antibiotics including the cyclic lipopeptide daptomycin. LiaR is phosphorylated in response to membrane stress to regulate downstream target operons. Using DNA ...
    • Variable Species Responses to Experimental Stony Coral Tissue Loss Disease (SCTLD) Exposure 

      Meiling, Sonora S.; Muller, Erinn M.; Lasseigne, Danielle; Rossin, Ashley; Veglia, Alex J.; (2021)
      Stony coral tissue loss disease (SCTLD) was initially documented in Florida in 2014 and outbreaks with similar characteristics have since appeared in disparate areas throughout the northern Caribbean, causing significant declines in coral communities. SCTLD is characterized by focal or multifocal lesions of denuded skeleton caused by rapid tissue ...
    • Variance Spectroscopy 

      (2015)
      Spectroscopic analysis and study of nanoparticle samples is often hampered by structural diversity that presents a complex superposition of spectral signatures. By probing the spectra of small volumes within dilute samples, we can expose statistical variations in composition to obtain information unavailable from bulk spectroscopy. This new approach ...
    • Variant interpretation through Bayesian fusion of frequency and genomic knowledge 

      Shaw, Chad A.; Campbell, Ian M. (2015)
      Variant interpretation is a central challenge in genomic medicine. A recent study demonstrates the power of Bayesian statistical approaches to improve interpretation of variants in the context of specific genes and syndromes. Such Bayesian approaches combine frequency (in the form of observed genetic variation in cases and controls) with biological ...
    • Variational description of the ground state of the repulsive two-dimensional Hubbard model in terms of nonorthogonal symmetry-projected Slater determinants 

      (2014)
      The few-determinant (FED) methodology, introduced in our previous works [R. Rodríguez-Guzmán et al., Phys. Rev. B 87, 235129 (2013); Phys. Rev. B 89, 195109 (2014)] for one-dimensional (1D) lattices, is here adapted for the repulsive two-dimensional Hubbard model at half filling and with finite doping fractions. Within this configuration mixing scheme, ...
    • Variations in optical coherence tomography resolution and uniformity: a multi-system performance comparison 

      (2014)
      Point spread function (PSF) phantoms based on unstructured distributions of sub-resolution particles in a transparent matrix have been demonstrated as a useful tool for evaluating resolution and its spatial variation across image volumes in optical coherence tomography (OCT) systems. Measurements based on PSF phantoms have the potential to become a ...
    • Vector bin-and-cancel for MIMO distributed full-duplex 

      Bai, Jingwen; Sabharwal, Ashutosh (2017)
      Abstract In a multi-input multi-output (MIMO) full-duplex network, where an in-band full-duplex infrastructure node communicates with two half-duplex mobiles supporting simultaneous up- and downlink flows, the inter-mobile interference between the up- and downlink mobiles limits the system performance. We study the impact of leveraging ...
    • Velocity Relaxation in a Strongly Coupled Plasma 

      Bannasch, G.; Castro, J.; McQuillen, P.; Pohl, T.; Killian, T.C.; (2012)
      Collisional relaxation of Coulomb systems is studied in the strongly coupled regime. We use an optical pump-probe approach to manipulate and monitor the dynamics of ions in an ultracold neutral plasma, which allows direct measurement of relaxation rates in a regime where common Landau-Spitzer theory breaks down. Numerical simulations confirm the ...
    • Velocity structure of the uppermost mantle beneath East Asia from Pn tomography and its dynamic implications 

      Wang, Suyun; Niu, Fenglin; Zhang, Guomin (2013)
      [1] East Asia is one of the most tectonically active regions on Earth's surface due to the collision from the India plate and the suctions induced by the subduction of the Pacific and Philippine plates. To better understand the complicated deformation and active seismicity of the area, we conducted a Pn traveltime tomography to estimate the compressive ...
    • Ventricular coupling in single ventricle patients: a MRI study of cardiac biomechanics 

      Krishnamurthy, Ramkumar; Noel, Cory V.; Pan, Wei; Jacot, Jeffrey; Lantin-Hermoso, Regina; (2016)
    • Versatile acid solvents for pristine carbon nanotube assembly 

      Headrick, Robert J.; Williams, Steven M.; Owens, Crystal E.; Taylor, Lauren W.; Dewey, Oliver S.; (2022)
      Chlorosulfonic acid and oleum are ideal solvents for enabling the transformation of disordered carbon nanotubes (CNTs) into precise and highly functional morphologies. Currently, processing these solvents using extrusion techniques presents complications due to chemical compatibility, which constrain equipment and substrate material options. Here, ...
    • Versatile phenotype-activated cell sorting 

      Lee, Jihwan; Liu, Zhuohe; Suzuki, Peter H.; Ahrens, John F.; Lai, Shujuan; (2020)
      Unraveling the genetic and epigenetic determinants of phenotypes is critical for understanding and re-engineering biology and would benefit from improved methods to separate cells based on phenotypes. Here, we report SPOTlight, a versatile high-throughput technique to isolate individual yeast or human cells with unique spatiotemporal profiles from ...