WordNet

not capable of physical reflection (同)nonreflecting
absence of a reflex; a sign of possible nerve damage
not exhibiting or characterized by careful thought (同)unthinking, unthoughtful

English Journal

Resonant cavities based on Parity-Time-symmetric diffractive gratings.

Kulishov M, Kress B, Slavík R.AbstractWe explore a new class of Distributed Feedback (DFB) and Distributed Bragg Reflector (DBR) structures that employ the recently-developed concept of Parity-Time (PT) symmetry in optics. The approach is based on using so-called unidirectional Bragg gratings that are non diffractive (transparent) when illuminated from one side and diffracting (Bragg reflection) when illuminated from the other side, thus providing a uni-directional Bragg functionality. Such unusual property is achieved through diffraction through a grating having periodic variations in both, phase and amplitude. DFB and DBR structures traditionally consist of a gain medium and reflector(s) made via periodic variation of the (gain media) refractive index in the direction of propagation. As such structures are produced in a gain material. It becomes just possible to add periodic amplitude modulation in order to produce the unidirectional Bragg functionality. We propose here new and unique DFB and DBR structures by concatenating two such unidirectional Bragg gratings with their nonreflective ends oriented outwards the cavity. We analyze the transmission and reflection properties of these new structures through a transfer matrix approach. One of the unique characteristics of the structure is that it inherently supports only one lasing mode.
Optics express.Opt Express.2013 Apr 22;21(8):9473-83. doi: 10.1364/OE.21.009473.
We explore a new class of Distributed Feedback (DFB) and Distributed Bragg Reflector (DBR) structures that employ the recently-developed concept of Parity-Time (PT) symmetry in optics. The approach is based on using so-called unidirectional Bragg gratings that are non diffractive (transparent) when
PMID 23609658

Weighting of the data and analytical approaches may account for differences in overcoming the inadequate representativeness of the respondents to the third wave of a cohort study.

Taylor AW, Dal Grande E, Grant J, Appleton S, Gill TK, Shi Z, Adams RJ.SourcePopulation Research and Outcome Studies, University of Adelaide, 122 Frome Street, Adelaide, South Australia, 5005 Australia. anne.taylor@adelaide.edu.au
Journal of clinical epidemiology.J Clin Epidemiol.2013 Apr;66(4):461-4. doi: 10.1016/j.jclinepi.2012.06.021. Epub 2012 Sep 27.
OBJECTIVES: Attrition in cohort studies can cause the data to be nonreflective of the original population. Although of little concern if intragroup comparisons are being made or cause and effect assessed, the assessment of bias was undertaken in this study so that intergroup or descriptive analyses
PMID 23021859

An Absorbing Boundary Condition for the Lattice Boltzmann Method Based on the Perfectly Matched Layer.

Najafi-Yazdi A, Mongeau L.SourceMechanical Engineering Department, McGill University, Montreal, QC, Canada, H3N 2J6.
Computers & fluids.Comput Fluids.2012 Sep 15;68:203-218. Epub 2012 Aug 14.
The Lattice Boltzmann Method (LBM) is a well established computational tool for fluid flow simulations. This method has been recently utilized for low Mach number computational aeroacoustics. Robust and nonreflective boundary conditions, similar to those used in Navier-Stokes solvers, are needed for
PMID 23526050