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Study on Spinnability of PP/PU Blends and Preparation of PP/PU Bi-component Melt Blown Nonwovens
Yanfen Zhou,Liang Jiang,Huiying Jia,Xiaolu Xing,Zhenhua Sun,Shaojuan Chen,Jianwei Ma,Stephen Jerrams 한국섬유공학회 2019 Fibers and polymers Vol.20 No.6
Melt blown polymer blends offers a good way to combine two polymers in the same fiber generating nonwovenswith new and novel properties. In this study, polypropylene (PP) and polyurethane (PU) were blended to prepare PP/PU bicomponentmelt blown nonwovens. The spinnability of PP/PU composites was investigated and PP/PU bi-componentnonwovens with compositions of 95/5, 90/10, 80/20 and 70/30 were prepared by using the melt blowing technique. The meltblown fibers exhibited a ‘sea-island’ structure with PP as the continuous phase and PU as the dispersed phase. When thecontent of PU in the blend was above 40 %, PP/PU melt blown nonwovens could not be produced due to fiber breaking. ForPP/PU (90/10) nonwovens, it was found that the average fiber diameter decreased with increasing die to collector (DCD) andelevated hot air pressure.
Necessary and Sufficient Conditions for Consensus of Third-Order Multi-Agent Systems
YanFen Cao,YuanGong Sun 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
This paper studies the consensus problem of third-order multi-agent systems for the case of undirected graph. Necessary and sufficient conditions for third-order consensus have been established under three different protocols. Unlike most of existing papers, we here focus on illustrating the relationship between the scaling strengths and the eigenvalues of the involved Laplacian matrix, which guarantees the third-order consensus for three different protocols.
Pharmaceutical Logistics Forecasting of Beijing : An Exploratory Study
Yanfen Hou,Xiaochun Lu 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.5
Pharmaceutical logistics is closely linked to national economy and people's livelihood. As the national medicine circulation industry development outline (2011-2015) and the new Good Supply Practice’s (GSP) promulgation and implementation in China, Beijing’s pharmaceutical logistics is facing great challenge. Analyzing the current pharmaceutical logistics service capability and predicting the future medical service demand can help us responding to future changes. In this paper, we have predicted the population of Beijing, analyzing medicine consumption per capita, predicting the demand of pallet spaces of Beijing’s pharmaceutical logistics in the future by using the Crystal Ball. We have come to the conclusion: the current storage capability of pharmaceutical logistics enterprises in Beijing can meet 77% demand. In 2020, pharmaceutical logistics enterprises in Beijing require 54, 7700 pallets for storage space, increasing 9,7700 pallets for warehouse to store medicine. We also find that the population has less influence on forecasting model. The logistics technology improvement will cause forecasting model unsuitable for future situation.
( Fan Yang ),( Yanfen Gong ),( Gang Liu ),( Shengming Zhao ),( Juan Wang ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.7
The role of CRE1 in a thermophilic fungus, Myceliophthora thermophila ATCC42464, was studied using RNA interference. In the cre1-silenced strain C88, the filter paper hydrolyzing activity and β-1,4-endoglucanase activity were 3.76-, and 1.31-fold higher, respectively, than those in the parental strain when the strains were cultured in inducing medium for 6 days. The activities of β-1,4-exoglucanase and cellobiase were 2.64-, and 5.59-fold higher, respectively, than those in the parental strain when the strains were cultured for 5 days. Quantitative reverse-transcription polymerase chain reaction showed that the gene expression of egl3, cbh1, and cbh2 was significantly increased in transformant C88 compared with the wild-type strain. Therefore, our findings suggest the feasibility of improving cellulase production by modifying the regulator expression, and an attractive approach to increasing the total cellulase productivity in thermophilic fungi.
Effect of Gynosaponin on Rumen In vitro Methanogenesis under Different Forage-Concentrate Ratios
Manatbay, Bakhetgul,Cheng, Yanfen,Mao, Shengyong,Zhu, Weiyun Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.8
The study aimed to investigate the effects of gynosaponin on in vitro methanogenesis under different forage-concentrate ratios (F:C ratios). Experiment was conducted with two kinds of F:C ratios (F:C = 7:3 and F:C = 3:7) and gynosaponin addition (0 mg and 16 mg) in a $2{\times}2$ double factorial design. In the presence of gynosaponin, methane production and acetate concentration were significantly decreased, whereas concentration of propionate tended to be increased resulting in a significant reduction (p<0.05) of acetate:propionate ratio (A:P ratio), in high-forage substrate. Gynosaponin treatment increased (p<0.05) the butyrate concentration in both F:C ratios. Denaturing gradient gel electrophoresis (DGGE) analysis showed there was no apparent shift in the composition of total bacteria, protozoa and methanogens after treated by gynosaponin under both F:C ratios. The real-time polymerase chain reaction (PCR) analysis indicated that variable F:C ratios significantly affected the abundances of Fibrobacter succinogenes, Rumninococcus flavefaciens, total fungi and counts of protozoa (p<0.05), but did not affect the mcrA gene copies of methanogens and abundance of total bacteria. Counts of protozoa and abundance of F.succinogenes were decreased significantly (p<0.05), whereas mcrA gene copies of methanogens were decreased slightly (p<0.10) in high-forage substrate after treated by gynosaponin. However, gynosaponin treatment under high-concentrate level did not affect the methanogenesis, fermentation characteristics and tested microbes. Accordingly, overall results suggested that gynosaponin supplementation reduced the in vitro methanogenesis and improved rumen fermentation under highforage condition by changing the abundances of related rumen microbes.
Hai Yu,Miao Zhang,Yanfen Wang,Janguo Lv,Yanmei Liu,Gang He,Zhaoqi Sun 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
In this study, a material with high photocatalytic activity was synthesized using ternary C/N/S-dopedTiO2 nanorod array (TiO2); this was done using a practical and straightforward vapor-phase hydrothermal(VPH) method at a low temperature. The effect of C/N/S content on TiO2 morphology, optical,photocatalytic and photoelectrochemical (PCE) properties of the material was investigated by varying thequality of thiourea. C/N/S-TiO2 reduced the bonding rate of electron-hole pairs and enhances visible lightabsorption, photocatalytic, and PCE properties. The C/N/S doping could significantly adjust theabsorption cut-off wavelengths (407 602 nm) and shorten the bandgap (3.04 2.18 eV) of TiO2. Undersimulated sunlight, 8-C/N/S-TiO2 had the highest photocatalytic efficiency of 97.6% for methylene blue(MB) in 150 min with a rate constant of 0.0192 min 1, which is approximately four times that of TiO2(0.005 min 1). The 8-C/N/S-TiO2 photoelectrode had the lowest transfer resistance for interfacial chargesand highest transient photocurrent of 33.5 mA/cm2, which isfive times higher than that of TiO2 (6.6 mA/cm2). The 8-C/N/S-TiO2 exhibits the most extensive PCE behavior as a photoelectrode, and has a currentdensity of 38.2 mA/cm2 at 2.5VRHE, which is about two times higher than TiO2 (19.1 mA/cm2). Thefavorable sunlight-driven photocatalytic activity is probably due to the synergistic effect of C/N/S-doping,which shifts the valence band maximum of TiO2 upward. This provides new ideas for future solar cellsthat can use dye-sensitized TiO2 nanorod arrays as photoanodes. It is noteworthy that VPH is a veryeffective strategy for fabricating semiconductors doped with multiple nonmetallic elements.
환경변화에 강인한 딥러닝 기반의 터널 균열 측정 및 진단
L. Minh Dang,Chanmi Oh,Yanfen Li,Hanxiang Wang,Chang-Jae Chun,Hyeonjoon Moon 한국차세대컴퓨팅학회 2022 한국차세대컴퓨팅학회 학술대회 Vol.2022 No.05
A tunnel is an essential public facility that enables uninterrupted transportation in crowded cities. Over time, various factors such as ageing and harsh environment could slowly damage the tunnel, leading to cracks and even human loss. There, the tunnel needs to be investigated regularly. Previous maintenance methods have primarily counted on the operators who directly monitor recorded videos to inspect the cracks and determine their seriousness. However, this is a time-consuming and error-prone process. Firstly, this paper introduces a huge tunnel cracks segmentation dataset that contains a total of 170,339 images. Next, a tunnel crack segmentation system that can automatically identify different types of cracks is suggested based on the collected data. The model uses the U-Net structure as the baseline model, with the encoder replaced by a pre-trained Resnet-152 model to improve the effectiveness of the feature extract process. Finally, additional measurements of the detected cracks, such as crack length and crack thickness, are computed.
Li Yuqi,Sun Meizhou,Li Yuanfei,Cheng Yanfen,Zhu Weiyun 아세아·태평양축산학회 2020 Animal Bioscience Vol.33 No.12
Objective: The purpose of this study was to reveal the metabolic shift in the fungus co-cultured with the methanogen (Methanobrevibacter thaueri). Methods: Gas chromatography-mass spectrometry was used to investigate the metabolites in anaerobic fungal (Pecoramyces sp. F1) cells and the supernatant. Results: A total of 104 and 102 metabolites were detected in the fungal cells and the supernatant, respectively. The partial least squares-discriminant analysis showed that the metabolite profiles in both the fungal cell and the supernatant were distinctly shifted when co-cultured with methanogen. Statistically, 16 and 30 metabolites were significantly (p<0.05) affected in the fungal cell and the supernatant, respectively by the co-cultured methanogen. Metabolic pathway analysis showed that co-culturing with methanogen reduced the production of lactate from pyruvate in the cytosol and increased metabolism in the hydrogenosomes of the anaerobic fungus. Citrate was accumulated in the cytosol of the fungus co-cultured with the methanogen. Conclusion: The co-culture of the anaerobic fungus and the methanogen is a good model for studying the microbial interaction between H2-producing and H2-utilizing microorganisms. However, metabolism in hydrogenosome needs to be further studied to gain better insight in the hydrogen transfer among microorganisms.