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Multi-chromatic silicon nanocrystals

Light(Science & Applications) 2017年第1期6卷 721-728页

作者： Benjamin Bruhn Benjamin JM Brenny Sidoeri Dekker Ilker Doğan Peter Schall katerina dohnalová Van der Waals-Zeeman Institute University of AmsterdamScience Park 904Amsterdam 1098 XHThe Netherlands Center for Nanophotonics AMOLFScience Park 104Amsterdam 1098 XGThe Netherlands Department of Applied Physics Eindhoven University of TechnologyP.O.Box 512Eindhoven 5600 MBThe Netherlands Dutch Institute for Fundamental Energy Research(DIFFER) P.O.Box 6336Eindhoven 5600 HHThe Netherlands

Silicon nanocrystals(SiNCs)have great potential to become environmental friendly alternatives to heavy-metal containing nanocrystals for applications including medical imaging,lighting and *** exhibit excellent photostability,non-toxicity and abundant resources,but their often reported inefficient and spectrally limited light emission seriously impair their *** we demonstrate a new method that converts SiNCs into an efficient and robust multi-chromatic ***~15 keV electron-beam irradiation of oxide-capped SiNCs,we introduce several types of color centers into the nanocrystal’s oxide shell with efficient blue,green and red emission bands,together yielding warm-white photoluminescence,even for a single *** centers are not native to the original system and we relate them to known defects in *** in the silica host,however,here the centers are efficiently optically *** further optimization and up-scaling of this method,e-beam irradiated SiNCs can be of great interest as white phosphors for applications such as LEDs.

关键词： cathodoluminscence color center electron beam multi-chromaticity silicon nanocrystals

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Intrauterine Insemination—Our Results between the Years 2008-2012

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Advances in Reproductive Sciences 2015年第2期3卷 34-40页

作者： Vilma Lánská Blanka Koubková Jitka Rezácová Michal Krcmár Pavel Darebny Lucie Melicharová katerina dohnalová Alena Vaverková Jaroslav Feyereisl Institute for the Care of Mother and Child PragueCzech Republic

The purpose of this retrospective study was to determine whether or not there was a significant relationship between women’s age as a cause of sterility and pregnancy after IUI. Furthermore, we evaluated the effect of stimulation of antiestrogens and time of hCG administration on the success of IUI in relation to the age of women. During the period between 2008 and 2012, we performed a total number of 793 IUI. Patients were prepared for IUI in the natural cycle and stimulation with antiestrogens (clomiphene citrate-CC). Ovulation was induced by hCG (Ovitrelle) 40 hours before IUI or immediately after the procedure. Sperm was processed through density gradients. The average success rate of IUI was 10.2% of pregnant women per cycle. Significantly the highest number of pregnant women 16.3% was women with a diagnosis of anovulation. Significantly the lowest success rate of IUI was at the immunological cause of infertility and endometriosis. There was no evidence of age dependence for women on the success of IUI. Stimulation of CC did not significantly increase the chance of becoming pregnant. There was also no statistically significant difference in hCG before and after IUI pregnancy success. The most important group of women for whom IUI is a suitable form of assisted reproduction consists of patients of 35 years old with anovulation cause of sterility. Those patients with an immunological cause of infertility and endometriosis have significantly lower chances of conceiving after IUI and it is preferable for them to choose other techniques of assisted reproduction and embryo transfer.

关键词： Intrauterine Insemination Pregnancy Rate Woman’s Age Cause of Infertility Administration of Clomiphene Citrate and Ovitrelle

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