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81.
J. D. Stenger-Smith R. A. Henry J. M. Hoover G. A. Lindsay M. P. Nadler R. A. Nissan 《Journal of polymer science. Part A, Polymer chemistry》1993,31(12):2899-2906
A new main-chain syndioregic (head-to-head) NLO polymer was synthesized. The glass transition temperature of high molecular weight polymer was found to be 208°C, and the polymer has minimal weight loss at temperatures to at least 250°C owing to the incorporation of hydrogen bonding moieties and rigid bridging groups. The polymer was further characterized using nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). The study of the nonlinear optical properties of this polymer are in progress. © 1993 John Wiley & Sons, Inc. 相似文献
82.
Benettin, Calgani and Strelcyn studied the dynamical separation of neighboring phase-space trajectories, determining the corresponding Lyapunov exponents by discrete rescaling of the intertrajectory separation. We incorporate rescaling directly into the equations of motion, preventing Lyapunov instability by using an effective constraint force. 相似文献
83.
Despite all the advances in nonlinear microscopy, all existing instruments are constrained to obtain images of one focal plane at a time. In this Letter we demonstrate a two-photon absorption fluorescence scanning microscope capable of imaging two focal planes simultaneously. This is accomplished by temporally demultiplexing the signal coming from two focal volumes at different sample depths. The scheme can be extended to three or more focal planes. 相似文献
84.
P. A. Schulte C. L. Geraci V. Murashov E. D. Kuempel R. D. Zumwalde V. Castranova M. D. Hoover L. Hodson K. F. Martinez 《Journal of nanoparticle research》2014,16(1):1-17
In this study we investigated the release of titanium dioxide (TiO2), silver (Ag) and silica (SiO2) engineered nanoparticles (ENPs) from three different paints by using standardized water immersion test for coatings. Fibre-cement panels were coated with paints containing ENPs and then exposed to UV light and abraded to simulate weathering. After the static water immersion test, we observed a very low release of Ti (4–8 μg/l), while the Ag measured in leachates was under detection limit (0.1 μg/l). A small release of Si was measured in leachates, with 73 mg/l of Si released from paints containing SiO2 ENPs after 120 h of water immersion. The cumulative loss of Si was about 1.8 % with respect to initial amount of Si in paint. Microscopic results highlighted that SiO2 ENPs are mainly released in form of agglomerates with other particles, and only very few single SiO2 ENPs were found in leachates. The results confirmed that Si migration is related to immersion cycles (wetting and drying cycles) of tested paints. 相似文献
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