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Yinan Li,윤웅찬,현명호 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.1
A new phosphorescent cyclometalated heteroleptic iridium (III) complex with an ancillary ligand of 4-azacrownpicolinate was prepared and its metal ion selective phosphorescent chemosensing behavior was investigated. The new iridium (III) complex exhibits notable phosphorescence quenching for Hg^2+ in aqueous 50% acetonitrile solution with respect to the selective phosphorescent detection of various metal ions including Li^+, Na^+, K^+, Cs^+, Mg^2+, Ca^2+,Ba^2+, Fe^2+, Ni^2+, Cu^2+, Zn^2+, Ag^+, Pb^2+, Cd^2+, Cr^2+, Cr^3+ and Hg^2+. The phosphorescence quenching for Hg^2+ increased linearly with increasing concentration of Hg^2+ in the range of 10 μM - 700 μM even in the presence of other metal ions,except for Cu^2+. Consequently, the new iridium (III) complex has the potential to be utilized for the determination of parts per million levels of Hg^2+ in aqueous acetonitrile media.
O'Connor, David,Hou, Deyi,Ok, Yong Sik,Song, Yinan,Sarmah, Ajit K.,Li, Xuanru,Tack, Filip M.G. Elsevier 2018 Journal of controlled release Vol.283 No.-
<P><B>Abstract</B></P> <P>The removal of recalcitrant organic pollutants in groundwater is a challenge being faced around the world. Achieving effective long-term remediation of contaminated aquifers faces a variety of significant issues such as back diffusion, tailing, and rebound. In recent years, some researchers have proposed the use of controlled release materials (CRMs) as a new approach to counteracting such issues. The novelty of CRMs lies in that they release their active products slowly, over prolonged periods of time, in order to sustain in situ treatments and long-term effectiveness. Here we review the main constituents of CRMs, analyze their production, characterization, and applications, with a focus on reaction mechanisms, effectiveness, and secondary effects. This review shows that the reactive components of CRMs most commonly involve either: (i) chemical oxidants to treat contaminants such as TCE, PCE, BTEX, and 1,4-Dioxane; (ii) sources of dissolved oxygen to stimulate aerobic biodegradation of contaminants such as BTEX and 1,4-Dioxane; or, (iii) substrates that stimulate reductive dechlorination of contaminants such as TCE and 1,2-DCA. It was found that in some studies, CRMs provided sustained delivery of CRM treatment reagents over several years, and achieved complete contaminant removal. However, lower removal rates were apparent in other cases, which may be ascribed to insufficient dispersion in the subsurface. There are a relatively limited number of field-scale applications of CRMs in contaminated land remediation. Those conducted to date suggest that CRMs could prove to be an effective future remediation strategy. Lessons learned from field applications, suggestions for future research directions, and conclusions are put forward in this review.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Long-term remediation of groundwater remains very challenging. </LI> <LI> Researchers have proposed the use of a variety of controlled release materials. </LI> <LI> They can release chemical oxidants, sources of dissolved oxygen, or substrates. </LI> <LI> Some controlled release materials can sustain reagent release for several years. </LI> <LI> Future research needs are put forward to help further develop these materials. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Li, Shihao,Jiang, Jie,Yan, Yinan,Wang, Ping,Huang, Gang,Kim, Nam hoon,Lee, Joong Hee,He, Dannong Elsevier 2018 Materials science & engineering. C, Materials for Vol.93 No.-
<P><B>Abstract</B></P> <P>Folate receptor targeted photo-luminescent quantum carbon dots (Fr-CDs) were successfully prepared from folic acid and phenylenediamine isomers through hydrothermal approaches. Fr-CDs were spherical particles smaller than 10 nm, and emit stable green, blue and red luminescence under ultraviolet region excitation (λex = 365 nm) with maximum emissive lengths at 530, 429, and 612 nm. And the corresponding photoluminescence quantum yield as 15.4%, 12.6% and 16.2% respectively. Up-converted photoluminescent properties in near infrared 800 nm spectral region located in green, blue and yellow region. In-vitro studies showed Fr-CDs had almost none cytotoxicity (cell viability over 80%) and high affinitive to the Hela celline highly-expressed-folate-receptor membranes, and lighted on cytoplasm as the fluorescent marker. It displayed long luminescent-stability with PL intensity above 90% in ultraviolet illuminant exposure over 24 h. In in-vivo studies, Fr-CDs were internalized and accumulated in targeted cancer tissues of cervical carcinoma and the emitting fluorescence maintains over 30 min.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Multicolor carbon dots was prepared from folic acid and phenylenediamin isomers. </LI> <LI> These carbon dots exhibit targeting abilities with high affinity to ovarian cancer cells and tissues. </LI> <LI> Ultra-violet and near-infrared light excited photo-luminescent spectrums were investigated, and related quantum yield was calculated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>FA-doped CDs can effectively target ovarian cancer cells and aggregate in ovarian tumor tissue in a short 15 min.</P> <P>[DISPLAY OMISSION]</P>
Li, Yinan,Yoon, Ung-Chan,Hyun, Myung-Ho Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.1
A new phosphorescent cyclometalated heteroleptic iridium (III) complex with an ancillary ligand of 4-azacrownpicolinate was prepared and its metal ion selective phosphorescent chemosensing behavior was investigated. The new iridium (III) complex exhibits notable phosphorescence quenching for Hg2+ in aqueous 50% acetonitrile solution with respect to the selective phosphorescent detection of various metal ions including $Li^+,Na^+,K^+,Cs^+,Mg^{2+},Ca^{2+},Ba^{2+},Fe^{2+},Ni^{2+},Cu^{2+},Zn^{2+},Ag^+,Pb^{2+},Cd^{2+},Cr^{2+},Cr^{3+}$ and $Hg^{2+}$. The phosphorescence quenching for $Hg^{2+}$ increased linearly with increasing concentration of $Hg^{2+}$ in the range of $10{\mu}M-700{\mu}M$ even in the presence of other metal ions, except for $Cu^{2+}$. Consequently, the new iridium (III) complex has the potential to be utilized for the determination of parts per million levels of $Hg^{2+}$ in aqueous acetonitrile media.
Robust Non-negative Matrix Factorization with β-Divergence for Speech Separation
Yinan Li,Xiongwei Zhang,Meng Sun 한국전자통신연구원 2017 ETRI Journal Vol.39 No.1
This paper addresses the problem of unsupervised speech separation based on robust non-negative matrix factorization (RNMF) with β-divergence, when neither speech nor noise training data is available beforehand. We propose a robust version of non-negative matrix factorization, inspired by the recently developed sparse and low-rank decomposition, in which the data matrix is decomposed into the sum of a low-rank matrix and a sparse matrix. Efficient multiplicative update rules to minimize the β-divergence-based cost function are derived. A convolutional extension of the proposed algorithm is also proposed, which considers the time dependency of the non-negative noise bases. Experimental speech separation results show that the proposed convolutional RNMF successfully separates the repeating time-varying spectral structures from the magnitude spectrum of the mixture, and does so without any prior training.