Preparation of Robust Aramid/Epoxy Composites through Enhancing the Interface Performance by Nanocoating Solution

Tingli Hu,Zengxiao Wang,Yutong Cao,Zu Ming Hu,Jun Rong Yu,Yan Wang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4

Aramid fiber reinforced composites (AFRC) have attracted considerable attention because of its high strength andmodulus. But the poor interface due to the smooth fiber surface and few active groups limits the application of the finalcomposites. In this study, robust AFRC was achieved via dip-coating approach. Instead of Kevlar fiber, sulfonefunctionalizedpoly(p-phthaloyl-p-phenylenediamine) (SPPTA) was served as precursor to prepare nanocoating solution. Byfurther grafting epichlorohydrin (ECH) and Shellac (SLC), the functional coating solution was obtained. After modification,the roughness and the polarity of the fiber were considerably improved. The modified AF/epoxy composites showedexcellent interfacial bonding and mechanical properties. For the sample grafted with SLC, the interfacial shear strength(IFSS) reached 43.7 MPa with a significant enhancement by 21.4 %; while the inter-laminar shear strength (ILSS) reached48.6 MPa with a reinforcement of 45.9 %. The flexural strength and tensile strength were increased to 283 MPa and831 MPa, indicating that the study provides an effective method to achieve high strength AFRC.

Calcium signalling mediated the regulation of growth and polysaccharide accumulation by light quality in Dendrobium offi cinale protocorms

Ting Lei,Suping Gao,Xiao Lin,Kaihui Zhang,Yingqi Liu,Wenji Li,Di Hu,Xiaofang Yu,Mingyan Jiang,Qibing Chen,Ying Sun 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.2

This study selected Dendrobium offi cinale protocorms as the experimental material and used diff erent light-quality treatmentsand calcium signalling inhibitors to explore the mechanism of the biological response of calcium to light quality. The results indicate that a 1:3 red:blue (R:B) light ratio promotes the accumulation of biomass and polysaccharides in theprotocorm. Nevertheless, this eff ect can be entirely counteracted by calmodulin (CaM) inhibitors and calcium ion-chelatingagents. The possible mechanisms of this eff ect are as follows: (1) The Ca 2+ -CaM signal-regulated photosynthetic apparatusis improved by the R:B 1:3 light, increasing the CaM content and Ca 2+ -ATPase activity. Thus, R:B 1:3 light increases thedevelopment of the photosynthetic apparatus in the D. offi cinale protocorm, enhances its photosynthetic productivity, andpromotes the activities of sucrose phosphatase; accordingly, biomass and sucrose accumulation increase. (2) R:B 1:3 lightenhances Ca 2+ -CaM signalling and regulates glycometabolic processes to promote the activities of sucrose synthase, thusincreasing fructose and glucose levels and providing suffi cient synthetic precursors to promote polysaccharide production.

The NAD(P)H: Quinine Oxidoreductase 1 (NQO1) Gene 609 C>T Polymorphism is Associated with Gastric Cancer Risk: Evidence from a Case-control Study and a Meta-analysis

Hu, Wei-Guo,Hu, Jia-Jia,Cai, Wei,Zheng, Min-Hua,Zang, Lu,Wang, Zheng-Ting,Zhu, Zheng-Gang Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.5

The association between the NAD(P)H:quinone oxidoreductase 1 (NQO1) gene C609T polymorphism (rs1800566) and gastric cancer has been widely evaluated, but a definitive answer is so far lacking. We first conducted a case-control study to assess this association in a large Han Chinese population, and then performed a meta-analysis to further address this issue. Although our case-control association study indicated no significant difference in the genotype and allele distributions of C609T polymorphism between gastric cancer patients and controls, in the meta analysis involving 4,000 subjects, comparison of alleles 609T and 609C indicated a significantly increased risk (46%) for gastric cancer (95% confidence interval (95%CI) for odds ratio (OR)=1.20-1.79) in individuals with the T allele. The tendency was similar to the homozygote (OR=1.81, 95%CI: 1.16-2.84), dominant models (OR=1.41, 95%CI: 1.12-1.79), as well as recessive model (OR=1.58, 95%CI: 1.06-2.35). Stratified analysis by study design demonstrated stronger associations in population-based than in hospital-based studies. And ethnicity-based analysis demonstrated a significant association in Asians. We conclude that the NQO1 gene C609T polymorphism increases the risk for gastric cancer, especially in Asian populations.

Segmentation by Preference of Chinese Tourism Festival Visitors

Ting Hu (호정),Myoung Jae Lim(임명재) 한양대학교 관광연구소 2011 觀光硏究論叢 Vol.23 No.3

관광축제분야는 개발의 용이성과 소비자의 다양한 요구를 충족할 수 있는 특성으로 인해 전 세계적으로 빠른 성장을 거듭하고 있다. 특히, 관광시장이 지속적으로 성장하고 있는 중국의 관광시장에서 축제상품은 높은 관심의 대상이 되고 있다. 본 연구는 중국의 잠재관광객을 대상으로 조사를 수행하여, 선호하는 축제유형을 알아보고, 선호유형에 따른 잠재시장 분석하였다. 분석결과 선호축제유형에 따라 4개의 세분시장이 도출되었으며, 각 시장의 특성을 알아보기 위한 분석과정을 진행하였다. 본 연구를 통해 중국 잠재관광객의 선호시장 유형을 알아볼 수 있었으며, 그에 따른 세분시장을 도출 할 수 있었다. 이와 같은 결과는 관광축제 개발자들에게 축제의 특성에 따른 표적시장 수립에 용이하게 활용될 수 있을 것이다. There has been a rapid growth in terms of numbers and diversity of festivals in China. With the increasing of festivals attended by residents and tourists, it is essential for festival managers to develop a profile for visitors that can guide marketing and developing procedures. This study aims to segment potential visitors to Chinese tourism festivals based on their preferences and to find out the characteristics of each segmented group. In order to achieve the objectives of the study, a survey is conducted to Chinese potential visitors. As the results, four clusters are derived from cluster analysis. And significant differences and characteristics are found among the clusters. Based on the segmentation results, some marketing strategies are proposed for festival managers to develop their festivals and to find their target markets.

The effects of LNG-tank sloshing on the global motions of FLNG system

Hu, Zhi-Qiang,Wang, Shu-Ya,Chen, Gang,Chai, Shu-Hong,Jin, Yu-Ting The Society of Naval Architects of Korea 2017 International Journal of Naval Architecture and Oc Vol.9 No.1

This paper addresses a study of inner-tank sloshing effect on motion responses of a Floating Liquefied Natural Gas (FLNG) system, through experimental analysis and numerical modeling. To investigate hydrodynamic characteristics of FLNG under the conditions of with and without LNG-tank sloshing, a series of numerical simulations were carried out using potential flow solver SESAM. To validate the numerical simulations, model tests on the FLNG system was conducted in both liquid and solid ballast conditions with 75% tank filling level in height. Good correlations were observed between the measured and predicted results, proving the feasibility of the numerical modeling technique. On the verified numerical model, Response Amplitude Operators (RAOs) of the FLNG with 25% and 50% tank filling levels were calculated in six degrees of freedom. The influence of tank sloshing with varying tank filling levels on the RAOs has been presented and analyzed. The results showed that LNG-tank sloshing has a noticeable impact on the roll motion response of the FLNG and a moderate tank filling level is less helpful in reducing the roll motion response.

Setosphapyrone C and D accelerate macrophages cholesterol effl ux by promoting LXRa/ABCA1 pathway

Ting Li,Jiayu Yin,Yubin Ji,Ping Lin,Yanjie Li,Zixun Yang,Shumei Hu,Jin Wang,Baihui Zhang,Saloni Koshti,Junfeng Wang,Chenfeng Ji,Shoudong Guo 대한약학회 2020 Archives of Pharmacal Research Vol.43 No.8

LXRα agonists have attracted signifi cant attentiondue to their potential biological activities on promotingcholesterol effl ux. This study was designed to investigatewhether setosphapyrone C and D have potential lipid-loweringcapacity and the underlying mechanisms in vitro. Ourdata showed that setosphapyrone C and D had weak cytotoxicitycompared to the liver X receptor α (LXRα) agonistT0901317. In RAW 264.7 macrophages, setosphapyroneC and D signifi cantly enhanced [ 3 H]-cholesterol effl ux by~ 21.3% and 32.4%, respectively; furthermore, setosphapyroneC and D enhanced the protein levels of ATP-bindingcassette transporter (ABC) A1 and LXRα by 58% and 69%,and 60% and 70% (8 μM), respectively; however, they had noeff ect on the protein levels of ABCG1 and scavenger receptorB type 1; additionally, they had minor eff ect on the mRNAexpression of lipogenic genes. Of note, setosphapyrone C and D signifi cantly enhanced LXRα/ABCA1pathway inmice primary macrophages. In BRL cells, setosphapyroneC and D signifi cantly improved the protein levels of ABCA1and ABCG1; setosphapyrone D signifi cantly enhanced theprotein expression of low-density lipoprotein. Collectively,setosphapyrone C and D with weak cytotoxicity exhibitedeff ective lipid-lowering eff ect via enhancing LXRα/ABCpathways. Setosphapyrones possess potential applicationfor the treatment of hyperlipidemic diseases.

Dissimilar Resistance Spot Welding of DP 600/A5052/DP 600 Triple Sheets

Ting Li,Xinjian Yuan,Zhan Hu,Kanglong Wu,Haodong Wang,Bangqiang Zhang 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.11

Triple sheets of DP 600/A5052 aluminum alloy/DP 600 steel were joined by means of resistance spot welding in this study. The experimental results showed that the microstructure of fusion zone was lath martensite for DP 600 and column crystals for A5052. Their grains coarsened with increasing distance away from the base metals. The interface zone between DP 600 and A5052 was composed of continuous Fe2Al5 intermetallic compound (IMC) layer and needle-like Fe4Al13 IMC. When welding time prolonged from 8 cycles to 17 cycles, the average length of Fe4Al13 phase adjacent to A5052 shortened from 2.3 μm to 0.89 μm, whereas the thickness of Fe2Al5 IMC layer near DP 600 widened from 1.59 μm to 2.59 μm. The tensile-shear load of DP 600/A5052/DP 600 joints reached a maximum value of 10.796 kN with 14 cycles welding time. Failure during tensile-shear testing occurred along DP 600/A5052 interfaces because Fe2Al5 and Fe4Al13 were brittle phases, but an amount of tearing area was found on the fracture surface.

Gravity effect of silica and polystyrene particles on deposition pattern control and particle size distribution on hydrophobic surfaces

Ting-Yu Hu,Chieh Wang,Kai-Chieh Yang,Li-Jen Chen 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-

Ring-like residual deposits are often observed after drying suspension droplets on surfaces. That introducesa crucial defect in practical applications, such as ink-jet printing that requires a uniform deposit. In this study, depositions after drying sessile/pendant droplets with silica/polystyrene particles wereexamined to identify the effect of gravitational sedimentation of particles on self-pinning and depositionpattern. The suspension droplet with larger polystyrene (or silica) particles would trigger the self-pinningat larger (or smaller) particle concentrations. The deposition pattern of pendant drops with silica particlesis hill-like. This is due to the large density difference between silica and water to induce high sedimentationvelocity, and the particles would precipitate and aggregate along the air–liquid interface to form ahollow shell deposit. The depositions for suspensions with bi-dispersed particles, the larger silica particleswould accumulate at the bottom of the deposit due to the higher sedimentation velocity, in contrastto the well-mixed in the deposits for bi-dispersed polystyrene particles. The sedimentation and capillaryflow velocities were calculated and discussed. These new findings reveal that the particle density (gravityeffect) can be used to adjust the sedimentation velocity to control the deposition morphology and particlesize distribution even to suppress the coffee-ring effect.

ON THE COMPLEX VARIABILITY OF THE SUPERORBITAL MODULATION PERIOD OF LMC X-4

HU, CHIN-PING,LIN, CHING-PING,CHOU, YI,YANG, TING-CHANG,SU, YI-HAO,HSIEH, HUNG-EN,CHUANG, PO-SHENG,LIAO, NAI-HUI The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2

LMC X-4 is an eclipsing high-mass X-ray binary exhibiting a superorbital modulation with a period of ~ 30:5 days. We present a detailed study of the variations of the superorbital modulation period with a time baseline of ~ 18 years. The period determined in the light curve collected by the Monitor of All-sky X-ray Image (MAXI) significantly deviates from that observed by the All Sky Monitor (ASM) onboard the Rossi X-ray Timing Explorer (RXTE). Using the data collected by RXTE/ASM, MAXI, and the Burst Alert Telescope (BAT) onboard Swift, we found a significant period derivative, $\dot{P}=(2.08{\pm}0.12){\times}10^{-5}$. Furthermore, the O{C residual shows complex short-term variations indicating that the superorbital modulation of LMC X-4 exhibits complicated unstable behaviors. In addition, we used archive data collected by the Proportional Counter Array (PCA) on RXTE to estimate the orbital and spin parameters. The detected pulse frequencies obtained in small time segments were fitted with a circular orbital Doppler shift model. In addition to orbital parameters and spin frequency for each observation, we found a spin frequency derivative of $\dot{v}=(6.482{\pm}0.011){\times}10^{-13}Hz{\cdot}s^{-1}$. More precise orbital and spin parameters will be evaluated by the pulse arrival time delay technique in the future.

The Effects of Festival Service Quality on Brand Equity

Hu Ting,Jeong Gang-Hoan 한국상품학회 2010 商品學硏究 Vol.28 No.5

This study is to examine the relationship between festival service quality and brand equity. Based on the literatures, dimensions of brand equity are defined. The relationship between festival service quality factors and brand equity are to be investigated. At the same time, which factors of festival service quality have effects on the dimensions of brand equity need to be found out. In order to achieve the objectives, a survey is carried out towards festival visitors who attended Gimje Horizon Festival. In general, the results confirm that festival service quality in terms of program quality, information quality, physical facilities quality and products quality have a positive effect on building brand equity. Festival visitors can increase their familiar with festival brand through the experience of various program, getting more information about the festival and seeing physical facilities with festival symbols. And festival brand image can be derived from all brand related activities provided by festival. Direct experience such as hands-on experience programs, purchasing festival products, or using festival facilities can make effects on building festival brand image.