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Fei Tong,Hongmeng Cheng,Jun Guo,Jianyong Wu,Hongshan Ge,Zhihua Li 한국생물공학회 2023 Biotechnology and Bioprocess Engineering Vol.28 No.1
The static magnetic field (SMF) and miRNAs are involved in the regulation of bone remodeling. Hence, this study was designed to investigate the effects of SMF on the proliferation and differentiation of osteoblasts, as well as identify related miRNAs. SMF promoted osteoblast proliferation and differentiation and inhibited osteoblast apoptosis. High-throughput sequencing identified that 41 miRNAs were upregulated and 25 miRNAs down-regulated when osteoblasts were exposed to SMF. The enrichment analysis and validation results indicated differentially expressed miR-466d and its target gene MMP13. In osteoblasts, miR-466d could directly target MMP13, and miR-466d overexpression combined with the exposure to SMF promoted differentiation, suppressing MMP13 expression. SMF increased miR-466 expression in osteoblasts, thereby inhibiting MMP13 expression and increasing osteoblast differentiation ability.
Fei Tian,Zhansheng Wu,Yujun Yan,Xinyu Ge,Yanbin Tong 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.7
A microwave-assisted synthetic method to form a series of AC/TiO2 for application as photocatalytic degradation of formaldehyde (HCHO) is presented. The influence of prepared conditions such as microwave power, microwave time, and the ratio of activated carbon and titanium dioxide sol (AC/TiO2-sel) on the degradation of HCHO was investigated. HCHO conversion of 58.68% was achieved by AC/TiO2 at microwave power of 700W for 15 min with AC/TiO2-sel ratio of 1 : 2, which maintained multiple properties including high content of anatase and TiO2 largely distributed on AC without reunion, and possessed abundant functional groups for degradation. The influence of operation parameters on the degradation was also investigated: increasing dosage of catalyst and decreasing the initial concentration of HCHO could increase the conversion of HCHO. Acidic conditions can promote degradation effect. Stronger intensity of UV irradiating could improve efficiency of photocatalytic conversion of HCHO.
Tong Zhang,Shaofeng Zhu,Guangsheng Fei,Yuanhang Ma 한양대학교 청정에너지연구소 2022 Journal of Ceramic Processing Research Vol.23 No.6
In this study, industrial waste tailings were used as the main raw material to prepare porous ceramic by injection molding. The porous ceramic samples were surface treated by γ-Aminopropyl triethoxysilane solution to be used as adsorbent to removeCu(II) from solution. The effects of sintering technology on properties of porous ceramic samples were studied. Meanwhile,the effects of test conditions on the adsorption characteristics of samples were also studied. The samples were analyzed by Xray diffraction, FTIR, and SEM. Atomic absorption spectrophotometer was used to determine the changes of Cu(II)concentration in the aqueous solution before and after adsorption. The results show that the compressive strength of thesamples is increased with the increase of sintered temperature and extension of holding time. The average pore diameters ofthe samples are decreased and concentrated between 0.1 and 0.2mm with the increase of sintered temperature. The removalrates and the adsorption capacities of the samples to Cu(Ⅱ) are increased with the increase of solution temperature, increaseof pH value of the solution and the extension of the test time.
Fei Wu,Xiaoting Xiao,Qian Liu,Jianghuai Tong 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.4
This paper focuses on comparing the quasi-static crushing mechanical behaviour and energy absorption characteristics of four types of interlayer tubes formed by combining mesh tube and 304 tube with two diff erent interface matching methods (tight fi t and metallurgical bonding). The deformations and energy absorptions of interlayer tubes are still dominated by 304 tube. The mesh tube and metallurgical points are able to induce and improve the deformation of 304 tube by changing its axial crushing stress state, thus, aff ecting the shapes and quantities of its folds, changing its deformation behaviours and modes, and fi nally forming interlayer tubes with diff erent mechanical behaviours and energy absorption characteristics. The tight fi t interlayer tubes exhibit better mechanical behaviour and energy absorption compared with the hollow 304 tube. The sintering interlayer tubes matching by metallurgical bonding can further improve the mechanical behaviours and energy absorptions of interlayer tubes and present more stable crushing deformations and stronger bearing capacities. It is an eff ective method to improve the mechanical behaviours and energy absorption characteristics of interlayer tubes by changing interface matching modes.
An, Tong,Tian, Yanzhong,Qin, Fei,Dai, Yanwei,Gong, Yanpeng,Chen, Pei The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.9
This paper presents an experimental investigation and a finite element (FE) analysis study on the thermal and mechanical behaviors of insulated-gate bipolar transistor (IGBT) power modules under various operating conditions. The power cycling test conditions are provided by two test benches, a direct current (DC) test bench and a pulse width modulation (PWM) test bench. Infrared (IR) camera acquisition methods are suggested as an approach for transient temperature measurements to estimate the effects of operating conditions and switching frequency on the thermal performance of an IGBT module. An electrical-thermal-mechanical FE model of an IGBT module is employed to determine the stress in the interconnections of an IGBT module induced by junction temperature fluctuations. Results indicate that the operating conditions significantly impact the maximum junction temperature, the junction temperature increase rate, and the junction temperature distribution of an IGBT chip and the thermally induced stress in the interconnections. The switching frequency strongly impacts the junction temperature of an IGBT chip, and the maximum junction temperature increases when the switching frequency increases due to the increasing switching loss. Furthermore, the junction temperature variation induced by the instantaneous switching loss is estimated by the proposed IR camera measurement method.
Tao Fei,James A. Walker,Kevin L. Vickerman,Levi M. Stanley,Darren Jarboe,Tong Wang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.58 No.-
This study focused on modifying the structure of acyl lipid to obtain waxes with desirable properties ofparaffin. Structure–function relationships were investigated and established. An increase in chain lengthsignificantly increased the hardness of esters. A hydroxyl group on the end of a linear monoester chainfurther increased hardness. Addition of pendent hydroxyl group increased the cohesiveness of ethyleneglycol mono and diesters (EGMD). Incorporating ether groups into diester also significantly increasedcohesiveness. Two potential paraffin substitutes were identified. Hydrophobic particles significantlyimproved water resistance and wet strength of the cardboards and a coating performance competitive toparaffin was achieved.
Tao Fei,Darren Jarboe,Tong Wang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
A soybean oil-based carnauba substitute was developed, and structure–function relationships wereestablished. Amide derivatives of saturated fatty acid showed higher hardness and melting point thanester derivatives having the same chain length. Increasing chain length using diacids increased hardness. The cinnamic ring was confirmed to contribute to surface shininess and smoothness. The addition oflong-chain fatty alcohols increased the hardness of a C52 (carbon chain length of 52) diester. Overall, amaterial consisted of C52 polyamide (76.3 wt%), C38 diamide (11.3 wt%), and C29 diamide with a ringstructure (12.4 wt%) showed comparable hardness and surface properties as carnauba wax.
Design of Coordination-Crosslinked Nitrile Rubber with Self-Healing and Reprocessing Ability
Zhi Fei Zhang,Xue Tong Liu,Kun Yang,Shu Gao Zhao 한국고분자학회 2019 Macromolecular Research Vol.27 No.8
In this work, we describe a simple approach to design of a coordination crosslinked elastomer with extraordinary mechanical properties: self-healing and recycling abilities by introducing Co-cyano coordination into nitrile rubber(NBR) matrix. The formation of reversible coordination crosslink network results in good mechanical properties superior to conventional sulfur-cured NBR, such as high stretchability and toughness. The reversibility of metal-ligand bond endows the polymer with self-healing capability and recycling or reprocessing abilities by rearrangement at elevated temperature. The fully cut samples after self-healing or reprocessing can restore their original tensile strength. It is also worth noting that the reclaimed NBR exhibited higher modulus than its original sample due to the compensation of new metal-ligand bonds formed during heating. This study provides possibilities to extend lifetime, reshaping and recycling capabilities of commercial rubber and reduce toxicity and environmental issues caused by waste rubber.