Highly Efficient Non-Covalent Energy Transfer in All-Organic Macrocycles

The use of aromatic organic macrocycles as supramolecular hosts for non-covalent energy transfer is reported herein. These macrocycles lead to stronger binding and more efficient energy transfer compared to commercially available γ-cyclodextrin. This energy transfer was particularly efficient for the highly toxic benzo[a]pyrene with a fluorescent BODIPY acceptor, with up to a 5-fold increase in the fluorophore emission observed

The Effects of Spatial Interpolation on a Novel, Dual-Doppler 3D Wind Retrieval Technique

Three-dimensional wind retrievals from ground-based Doppler radars have played an important role in meteorological research and nowcasting over the past four decades. However, in recent years, the proliferation of open-source software and increased demands from applications such as convective parameterizations in numerical weather prediction models has led to a renewed interest in these analyses. In this study, we analyze how a major, yet often-overlooked, error source effects the quality of retrieved 3D wind fields. Namely, we investigate the effects of spatial interpolation, and show how the common practice of pre-gridding radial velocity data can degrade the accuracy of the results. Alternatively, we show that assimilating radar data directly at their observation locations improves the retrieval of important dynamic features such as the rear flank downdraft and mesocyclone within a simulated supercell, while also reducing errors in vertical vorticity, horizontal divergence, and all three velocity components.Comment: Revised version submitted to JTECH. Includes new section with a real data cas

Intensifying Publicness Within The Void

Vancouver’s downtown is faced with a disappearing public realm. The rezoning of privately-owned public spaces for commercial, high-end retail and luxury housing, has further fragmented the urban public ground plane with sameness after sameness. As capital demands perpetuate, and land for permanent public intervention is diminished, the city of Vancouver is unable to adapt to the changing social and public demands within the downtown. This project proposes a kit of parts for the city to adopt within privately owned public spaces, to create a connected public urban network and support vibrant and dynamic public life within the downtown of Vancouver.Applied Science, Faculty ofArchitecture and Landscape Architecture (SALA), School ofUnreviewedGraduat

Effect of NaCl on the conversion of cellulose to glucose and levulinic acid via solid supported acid catalysis

Cellulose is hydrolyzed to glucose, which is further converted to levulinic acid in the presence of Nafion, as a surface supported acid catalyst. The addition of simple alkali metal halide salts, including NaCl, provides significant enhancement to the yield. The catalyst can be recycled suggesting possible extension into a continuous flow reactor for the synthesis of the biofuel precursors. © 2011 Elsevier Ltd. All rights reserved

Two-step thermochromism in poly(3-docosoxy-4-methylthiophene): Mechanistic similarity to poly(3-docosylthiophene)

The two-step thermochromism in poly(3-docosoxy-4-methylthiophene) by using reflection and fluorescence spectroscopies and differential scanning calorimetry (DSC) was investigated. The polymer sample was prepared for DSC by drip-coating a solution of the polymer in tetrahydrofuran (THF) on the aluminum foil and evaporating the solvent. The polymer film was heated with a heat gun and rapidly quenched with liquid nitrogen to form the mesophase. Variable-temperature fluorescence spectra were recorded on Ocean Optics S2000 instrument with a blue LED light source (λ = 470 nm). The fluorescence spectrum (excited at 470 nm) of the mesophase contained a weak, broad emission with a maximum centered at ~650 nm. The emission band of the high temperature phase had peaks at 540 and 565 nm, with much greater intensity than the emission band of the mesophase