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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.
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.
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.
Cushion Polyurethane Sandwich Composite Structures Strengthened by a Concave-Convex Fabric Panels
Ting-Ting Li,Peiyao Liu,Bing-Chiuan Shiu,Hongyang Wang,Hao-Kai Peng,Jia-Horng Lin,Ching-Wen Lou 한국섬유공학회 2022 Fibers and polymers Vol.23 No.12
In order to improve the low velocity impact resistance, flexible PU foam composites (FPUC) with a sandwichstructure are proposed. The interlayer is composed of a concave-convex fabric structure while the top/bottom layers are madeof polyurethane foam (PU). The core is prepared as follows. Seven warp knitted spacer fabric types (WKSF) (WKSF.1-7) arelaminated with different number of layers to form cuboids, which are fixed firmly between two layers of low melting pointpolyester (LMPET) fabrics via hot melting. The effects of spacer yarn density, spacer yarn inclination angle, combination ofspacer fabrics, and number of lamination layers on the dynamic cushion performance are evaluated. With the impact energybeing 16 J, FPUs demonstrate an energy absorption level that is 19 % and 39 % greater than PU and WKSF. Furthermore,ultra-high molecular weight polyethylene fabric can effectively enhance the surface strength. Finally, the results arecomputed via theoretical prediction formulae of dynamic buffer resistance is in conformity with the experimental test results.
Effect of HPFRCC on Seismic Performance of Beam-Column-Slab Subassembly
Ting-Ting Lu,Xing-Wen Liang 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.12
High performance fiber reinforced cementitious composites (HPFRCC) material exhibits strain-hardening and multiple cracking behaviors. Using HPFRCC in the reinforced concrete (RC) frame is considered to improve the seismic performance and damage mechanism of structure. Three beam-column-slab subassemblies were tested under cyclic loading, and eight frame models were simulation by ABAQUS. In this paper, the effect of substitution of concretewith HPFRCC on the seismic performance and damage mechanism of subassemblies was investigated. According to the test results, the lateral bearing capacity and deformability of beam-column-slab subassemblies increased by above 10% through using the HPFRCC material in the expected damage positions. The shear resistance of the joint zone with HPFRCC material increased by 1.6%, the shear deformation of the joint zone decreased by 7.9%. And the contribution of slab bars to the beam flexural bearing strength also decreased for that the yielding range and the strain amplitude of slab bars are limited through using HPFRCC material. Consequently, the subassemblies were prone to the “strong column - weak beam” damage mechanism to using HPFRCC material in the expected damage positions.
Ting-Ting Su,Wen-Feng Ren,Jiang-Meng Yuan,Ke Wang,Bing-Yu Chi,Run-Cang Sun 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
The commercial application of silicon (Si) anodes with high theoretical capacity is hampered by the poorcyclic stability because the huge volume change of Si during discharge/charge processes results in thepulverization of electrode materials and the electric contact loss of electrode materials with copper(Cu) foils. Binders play an important role for adhering active materials and conductive additives togetheronto Cu foils. Herein, we design and develop a three-dimensional networked composite binder (PAA-co-SN) via an amidation reaction between polyacrylic acid (PAA) and thiourea (SN). The granular anchors(CuxS) are constructed at the interface between PAA-co-SN binders and Cu foils, resulting from the reactionof S and Cu during the drying processes of Si electrodes. When used as binders for Si nanoparticles,they exhibit stable cyclic performance (1580 mAh g1 after 500 cycles). The anchoring mechanismbetween composite binders and Cu foils provides a strategy for the improvement of electrochemicalproperties of Si-based anodes for lithium-ion batteries.
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.
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.
Effects of Gypenosides on Acute Stress in Mice
Ting Ting Zhao,이명구,Keon Sung Shin,최현숙 한국생약학회 2013 Natural Product Sciences Vol.19 No.4
The effects of gypenosides (GPS) on electric footshock (EF)-induced acute stress in mice were investigated. Mice were treated orally with GPS (30 - 400 mg/kg) once a day for 5 days. After 2 days of GPS treatment, mice were exposed to EF stimuli (intensity, 2 mA; interval, 10 s; duration, 3 min) for acute stress for 3 days. Spontaneous locomotor activity was increased by acute EF stress, which was decreased by treatment with GPS (100 and 400 mg/kg). In addition, the increased levels of dopamine and serotonin by acute EF stress in the brain were reduced by treatment with GPS (100 and 400 mg/kg). The serum levels of corticosterone increased by acute EF stress were also reduced by GPS (100 and 400 mg/kg). These results suggest that GPS shows the ameliorating effects on acute EF stress by modulating the activity of dopaminergic and serotonergic neurons, and the serum levels of corticosterone. Clinical trials of GPS need to be conducted further so as to develop promising anti-stress agents.