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TING-TING ZHANG,TING-TING GUO,ZHI-PING WU,SI-WEI YANG,ZHOU-FENG WANG,FANG LIAO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.5
In this paper, a new simple approach has been developed for the preparation of α-Fe2O3 microspheres by a facile hydrothermal method using PVP as a surfactant. Uniform α-Fe2O3 microspheres could be routinely synthesized through solvothermal approach by controlling the PVP/FeCl3⋅6H2O ratio. The as-obtained α-Fe2O3 microspheres exhibit high efficiency on the decolorization of RhB aqueous solution in the presence of H2O2 at room temperature.
Dispersal and Control of Anammox Granular Sludge at High Substrate Concentrations
Ting-Ting Chen,Ping Zheng,Li-Dong Shen,Chong-Jian Tang,Shuang Ding 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.5
This paper reports about the dispersal and control of anammox granular sludge at high substrate concentrations. The results demonstrate that anammox granular sludge would turn into flocculent sludge when the substrate concentrations exceed the inhibitory threshold concentrations, with an apparent drop in the settling velocity of anammox sludge from 73.73 to 16.49 m/h. Moreover, the sludge was washed out of the reactor and a decrease in the nitrogen removal rate from 23.82 to 16.97kg N/(m3/day) was observed. The dominant anammox bacteria in the granular and flocculent sludge were Candidatus Kuenenia stuttgartiensis; however, the contents of heme c and extracellular polymeric substances in the flocculent sludge were much lower than in the granular sludge. Furthermore, the chemical composition of extracellular polymeric substances was different. The high nitrite concentrations more than the inhibitory threshold concentrations were regarded as the reason for the observed granular sludge dispersal and deterioration in reactor performance. The apparent dispersed granular sludge and malfunction of reactor performance could be recovered by means of washing out the residual substrate from the reactor and then re-running the reactor from low substrate concentrations.
GENERALIZED WEYL’S THEOREM FOR FUNCTIONS OF OPERATORS AND COMPACT PERTURBATIONS
Ting Ting Zhou,Chun Guang Li,Sen Zhu 대한수학회 2012 대한수학회보 Vol.49 No.5
Let $\mathcal{H}$ be a complex separable infinite dimensional Hilbert space. In this paper, a necessary and sufficient condition is given for an operator T on $\mathcal{H}$ to satisfy that $f(T)$ obeys generalized Weyl's theorem for each function $f$ analytic on some neighborhood of ${\sigma}(T)$. Also we investigate the stability of generalized Weyl's theorem under (small) compact perturbations.
Ting-Ting Qi,Ping-Zhan Si,Fang Cheng,Zhi-Rui Wang,Hong-Liang Ge,Qiong Wu,Jihoon Park,Chul-Jin Choi 한국자기학회 2023 Journal of Magnetics Vol.28 No.1
Cubic perovskite-type Mn4C is difficult to prepare for its metastable characteristics. In this work, we have obtained high-purity Mn4C successfully by using melt-spinning method. The effects of stoichiometry on the structure and magnetic properties of the samples were studied systematically. We found that x = -0.1 is the optimum composition for the formation of the cubic perovskite phase in Mn4+xC during rapid quenching. Most Mn4+xC melt-spun ribbons with x other than -0.1 are composed of Mn23C6, α-Mn, and Mn4C, while the fraction of different phase in Mn4+xC ribbons varies with x. The Curie temperature of Mn4+xC ribbons increases slightly with decreasing x, which may affect the lattice parameters of cubic Mn4C and thus the Mn-Mn exchange interactions. The magnetization of Mn4+xC (x = -0.1 and 0) increases with increasing temperature in high-temperature region while the onset temperature for such behavior is dependent on the fraction of Mn4C in the samples.
Using PCA to detect objects in moving background
Ting Ting Li(이팅팅),Rishu Gupia(리슈),Namseok Choi(최남석),Byung-Gook Lee(이병국) 한국멀티미디어학회 2009 한국멀티미디어학회 학술발표논문집 Vol.2009 No.2
Moving object detection is a basic component of many computer vision applications. It has a critical impact on the performance of visual surveillance and intelligent transportation. This paper proposes an adaptive moving object detection approach that can deal with dynamic scenes. This approach uses PCA to describe the background model. Experimental results demonstrate that the proposed method is able to detect moving objects under various types of dynamic scenarios.
Ting Ting Wu,Bo Ra Hwang,Eun Ju Cho 한국식품영양과학회 2011 Preventive Nutrition and Food Science Vol.16 No.3
The radical scavenging activity and inhibition effect from lipid peroxidation induced by peroxyl radical of methanol extract from Perilla frutescens and its active compound, rosmarinic acid (RA), were investigated in vitro. The treatment of extract and RA scavenged 1,1-diphenyl-2-picrylhydrazyl, hydroxyl radical (·OH) and nitric oxide in a concentration-dependent manner. In particular, the extract and RA showed strong radical scavenging activity against ·OH, the most toxic and reactive radical. In addition, Perilla frutescens and RA effectively inhibited lipid oxidation induced by sodium nitroprusside and 2, 2'-azobis(2-aminopropane) dihydrochloride, determined by the ferric thiocyanate method. The present results suggest that Perilla frutescens and RA play a protective role against oxidative stress induced by free radical and lipid peroxidation.
Ting-Ting Li,Shuang-Shuang Geng,Hui-Yan Xu,Ao-Lin Luo,Peng-Wei Zhao,Huan Yang,Xing-Wei Liang,Yang-Qing Lu,Xiao-Gan Yang,Ke-Huan Lu 대한수의학회 2020 Journal of Veterinary Science Vol.21 No.1
Currently, the systems for culturing buffalo spermatogonial stem cells (SSCs) in vitro are varied, and their effects are still inconclusive. In this study, we compared the effects of culture systems with undefined (foetal bovine serum) and defined (KnockOut Serum Replacement) materials on the in vitro culture of buffalo SSC-like cells. Significantly more DDX4- and UCHL1-positive cells (cultured for 2 days at passage 2) were observed in the defined materials culture system than in the undefined materials system (p < 0.01), and these cells were maintained for a longer period than those in the culture system with undefined materials (10 days vs. 6 days). Furthermore, NANOS2 (p < 0.05), DDX4 (p < 0.01) and UCHL1 (p < 0.05) were expressed at significantly higher levels in the culture system with defined materials than in that with undefined materials. Induction with retinoic acid was used to verify that the cultured cells maintained SSC characteristics, revealing an SCP3+ subset in the cells cultured in the defined materials system. The expression levels of Stra8 (p < 0.05) and Rec8 (p < 0.01) were significantly increased, and the expression levels of ZBTB16 (p < 0.01) and DDX4 (p < 0.05) were significantly decreased. These findings provided a clearer research platform for exploring the mechanism of buffalo SSCs in vitro.