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Luminescence properties of Cd Te QDs embedded in Zn_5(CO_3)_2(OH)_6 matrix

Chinese Chemical Letters 2016年第12期27卷 1788-1792页

作者： Guo-Fang Wang An-Xiang Guan Chun-Yan Zhou Si-Yu Xia Qian Chen Xue-Ting Chen Li-Ya Zhou School of Chemistry and Chemical Engineering Guangxi University

CdTe@Zn5（CO3）2（OH）G composites were synthesized by a hydrothermal method. CdTe@Zn5（CO3）2（OH）6 composite nanospheres were characterized via X-ray diffraction, scanning electron microscopy, energy- dispersive X-ray spectroscopy, and photoluminescence （PL）. The hydrothermal reaction time and the mole ratios of Zn/Te played important roles in the growth and fluorescence intensity of CdTe@Zn5（CO3）2（OH）6 composites. The composite powders showed peak PL at 578 nm at 1.6 times the intensity of powdered CdTe QDs. CdTe@Zn5（CO3）2（OH）6 exhibited a strong yellow fluorescence emission, and its preparation method was easy and economical. Therefore, CdTe@Zn5（CO3）2（OH）6 offers potential applications in biological markers and light-emitting diodes.

关键词： Quantum dots fluorescent powder Basic zinc carbonate Hydrothermal Light-emitting diodes

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Simulated Microbe Removal around Finger Rings Using Different Hand Sanitation Methods

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International Journal of Oral Science 2009年第3期1卷 136-142页

作者： Archana A. Alur Madhavi J. Rane James P. Scheetz Douglas J. Lorenz Lawrence Gettleman Ballard High School Louisville Kentucky USA School of Medicine University of Louisville Louisville Kentucky USA School of Dentistry University of Louisville Louisville Kentucky USA School of Public Health & Information Sciences University of Louisville Louisville Kentucky USA

Aim It is our opinion that the CDC and the WHO have underestimated cross-contamination under examination gloves in dental clinics while wearing jewelry, such as finger rings. These agencies only ＂recommend＂ removing jewelry, and only washing hands for 15 seconds with soap and warm water before donning gloves. This study examined several washing procedures and finger rings using simulated microbes. Methodology A gloved robber hand manikin was made and fitted with a flesh disposable vinyl glove. Four fingers were fitted with rings or no ring, dusted with simulated microbes, and washed with a scrub brush for 5, 15, and 25 seconds under 20℃ and 40℃ water alone, or with liquid hand soap. Light levels （in lux） of fluorescent powder before and after washing were measured and delta scores calculated for changes in light levels, equivalent to effectiveness of hand washing procedures. A full-factorial, 3-factor analysis of variance （ANOVA） was used to test for differences among levels of the three study factors-time, temperature, and soap use. Tukey＇s post hoc honestly significant difference （HSD） test was applied to significant factors to examine pair-wise differences between factor levels. Results It was found that the longer the hands with rings were washed with a scrub brush under flowing water, the more simulated microbes were removed. By 25 seconds, all methods were essentially the same. Simulated microbes were more difficult to remove from the palm compared to the back of the hand. The liquid hand soap used in this study was more effective with warm water than cold. When given a choice of washing with cold water up to 15 seconds, it would be preferable not to use soap to remove simulated microbes. Qualitatively, the outer surface of finger rings were more effectively cleaned than the crevice below the ring, and the ring with a stone setting appeared to accumulate and retain simulated microbes more than other rings. Conclusion The most effective treatment was washing wi

关键词： dental exam gloves finger ring jewelry crosscontamination hand hygiene microbes fluorescent powder dental health care workers

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Movement Patterns of the Eastern Chipmunk (<i>Tamias striatus</i>) in Four Fragmented Landscapes of Prince Edward Island, Canada

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Open Journal of Ecology 2020年第10期10卷 688-715页

作者： Sheldon B. Opps Leslie A. Cudmore Marina Silva-Opps Department of Physics University of Prince Edward Island Charlottetown Prince Edward Island Canada Office of the Vice President Academic and Research University of Prince Edward Island Charlottetown Prince Edward Island Canada Department of Biology University of Prince Edward Island Charlottetown Prince Edward Island Canada

The analysis of animal movement patterns can provide important information on animals’ responses to habitat features. In this study, the movement paths of eastern chipmunks (Tamias striatus) were examined in four landscapes, with different levels of habitat fragmentation, using either fluorescent powdering or spool-and-line tracking. Descriptions of the tree and ground vegetation communities were performed in the vicinity of the trail to obtain information on habitat use and habitat selection. Several key movement variables were calculated, including the total path length, net distance, fractal dimension, and radius of gyration. Despite statistically significant differences in some of the movement metrics between the four landscapes, the overall movement patterns were generically the same for all of chipmunk paths examined in this study. The data were compared to trends expected based on random or correlated random walks, as well as Lévy-walk models. The mean squared net displacement did not support the correlated random walk predictions, except at smaller spatial scales, but overall demonstrated Lévy-like super diffusive behaviour. Lévy-like patterns were also confirmed from the move-length distributions that demonstrated truncated-tail power-law behaviour. Although this would suggest invariance of the movement patterns at all spatial scales studied, fractal analysis revealed at least two transitions in movement patterns at scales of around 2 and 5 m. The transition point at 2 m was negatively correlated with the density of small trees, while the transition at ~5 m was positively correlated with the spatial distribution of large trees. As the habitat-preference data showed that small trees are among the least preferred habitat component, while large trees were among the most preferred habitat, chipmunks are likely to alter their movement behaviour to avoid small trees, and attracted towards large trees possibly to avoid predators. Overall, we determined th

关键词： fluorescent powder Spool-and-Line Fractal Radius of Gyration Lévy Walk Correlated Random Walk Small Mammals Prince Edward Island

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