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Chen Ran-Ran,Ren Qi-Fang,Liu Yu-Xin,Ding Yi,Zhu Hai-Tao,Xiong Chun-Yu,Jin Zhen,오원춘 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.5
Herein, a novel visible-light-responsive g-C 3 N 4 /diatomite/MnO 2 composite was successfully fabricated through a simple redox reaction method. The structure and morphology of the sample are mainly characterized by X-ray diff raction (XRD), photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmis- sion electron microscopy (TEM), and ultraviolet–visible spectroscopy (UV–Vis). In this paper, the photo-catalytic activity of the sample was evaluated by degradation RhB under visible-light irradiation. The results shown that, compared with g-C 3 N 4 /diatomite composite, MnO 2 , g-C 3 N 4 , diatomite, the prepared g-C 3 N 4 /diatomite/2.5%MnO 2 composite exhibits bet- ter photo-catalytic activity and stability. At the same time, the eff ect of diff erent MnO 2 additions on the photo-catalytic activity of the composite material was further analyzed. The results indicated that the g-C 3 N 4 /MnO 2 /diatomite composites exhibit highest photo-catalytic activity when the adding amount of MnO 2 reached 2.5%. The degradation rate of the g-C 3 N 4 / diatomite/2.5%MnO 2 is 93% after recycling for three times, showing good stability and reusability. Moreover, the mechanism of catalytic performance enhancement also has been discussed.
Influence of a Flexible Retaining Wall on Performance of an Adjacent Deep Excavation
Qi-Run Yang,Ming-Guang Li,Jin-Jian Chen 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.2
In urban areas with scarce land resources, many deep excavations are performed adjacent to flexible retaining walls. This study investigated the influence of a flexible retaining wall on the performance of an adjacent deep excavation through numerical modeling. The numerical method incorporating the hardening soil small-strain model and input parameters were primarily validated using a well-documented case. Hypothetical models with different spacings between the deep excavation and existing flexible retaining wall were established to study the deformation behavior of diaphragm walls and characteristics of lateral earth pressure. Parametric studies were carried out to investigated the influence of the excavation width, wall depth, and bending rigidity of retaining walls on the performance of the excavation. Finally, the mechanisms of the flexible retaining wall to influence the mobilization of the arching effect in confined soil were discussed. Results show that the adjacent flexible retaining wall aggravates maximum wall deformation and leads to the inclination of the excavation. The impact is mainly attributed to the redistribution of lateral earth pressure resulted from the mobilization of the arching effect. However, the influence of the flexible retaining wall on the magnitude of the resultant force of lateral earth pressure is insignificant. Both qualitative analysis and numerical results prove that the general shape of the major principal stress trace is a curve convex to stabilized soil when the arching effect is generated.
Preparation of bioactive nano-hydroxyapatite coating for artificial cornea
Run-Rong Lin,Xuan Mao,Qi-Cong Yu,Bai-Hua Tan 한국물리학회 2007 Current Applied Physics Vol.7 No.s1
Bioactive coatings containing hydroxyapatite(HA) nano crystals were prepared on PHEMA membrane by a sol dipping method.A cellcoating and the aggregation degree of HA particles inuence the adhesion of the cornea broblasts to the membrane, which dependsdramatically on the weight ratio between the nano-HA and the dispersant. The optimal condition of the coating preparation is with adispersant/HA = 1.25 weight ratio. The PHEMA membrane covered with nano-HA coating is promising for articial cornea use.
Qi, Lizhi,Yan, Sumei,Sheng, Ran,Zhao, Yanli,Guo, Xiaoyu Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.3
This study was conducted to determine the effects of saturated long-chain fatty acids (LCFA) on cell proliferation and triacylglycerol (TAG) content, as well as mRNA expression of ${\alpha}s1$-casein (CSN1S1) and genes associated with lipid and protein synthesis in bovine mammary epithelial cells (BMECs). Primary cells were isolated from the mammary glands of Holstein dairy cows, and were passaged twice. Then cells were cultured with different levels of palmitate or stearate (0, 200, 300, 400, 500, and 600 ${\mu}M$) for 48 h and fetal bovine serum in the culture solution was replaced with fatty acid-free BSA (1 g/L). The results showed that cell proliferation tended to be increased quadratically with increasing addition of stearate. Treatments with palmitate or stearate induced an increase in TAG contents at 0 to 600 ${\mu}M$ in a concentration-dependent manner, and the addition of 600 ${\mu}M$ was less effective in improving TAG accumulation. The expression of acetyl-coenzyme A carboxylase alpha, fatty acid synthase and fatty acid-binding protein 3 was inhibited when palmitate or stearate were added in culture medium, whereas cluster of differentiation 36 and CSN1S1 mRNA abundance was increased in a concentration-dependent manner. The mRNA expressions of peroxisome proliferator-activated receptor gamma, mammalian target of rapamycin and signal transducer and activator of transcription 5 with palmitate or stearate had no significant differences relative to the control. These results implied that certain concentrations of saturated LCFA could stimulate cell proliferation and the accumulation of TAG, whereas a reduction may occur with the addition of an overdose of saturated LCFA. Saturated LCFA could up-regulate CSN1S1 mRNA abundance, but further studies are necessary to elucidate the mechanism for regulating milk fat and protein synthesis.
Mitochondrial Genome Sequence of Echinostoma revolutum from Red-Crowned Crane (Grus japonensis)
Rongkun Ran,Qi Zhao,Asmaa M.I. Abuzeid,Yue Huang,Yunqiu Liu,Yongxiang Sun,Long He,Xiu Li,Jumei Liu,Guoqing Li 대한기생충학ㆍ열대의학회 2020 The Korean Journal of Parasitology Vol.58 No.1
Echinostoma revolutum is a zoonotic food-borne intestinal trematode that can cause intestinal bleeding, enteritis, and diarrhea in human and birds. To identify a suspected E. revolutum trematode from a red-crowned crane (Grus japonensis) and to reveal the genetic characteristics of its mitochondrial (mt) genome, the internal transcribed spacer (ITS) and complete mt genome sequence of this trematode were amplified. The results identified the trematode as E. revolutum. Its entire mt genome sequence was 15,714 bp in length, including 12 protein-coding genes, 22 transfer RNA genes, 2 ribosomal RNA genes and one non-coding region (NCR), with 61.73% A+T base content and a significant AT preference. The length of the 22 tRNA genes ranged from 59 bp to 70 bp, and their secondary structure showed the typical cloverleaf and D-loop structure. The length of the large subunit of rRNA (rrnL) and the small subunit of rRNA (rrnS) gene was 1,011 bp and 742 bp, respectively. Phylogenetic trees showed that E. revolutum and E. miyagawai clustered together, belonging to Echinostomatidae with Hypoderaeum conoideum. This study may enrich the mitochondrial gene database of Echinostoma trematodes and provide valuable data for studying the molecular identification and phylogeny of some digenean trematodes.
On Diagonal Loading for Robust Adaptive Beamforming Based on Worst-Case Performance Optimization
Jing-ran Lin,Qi-cong Peng,Huai-zong Shao 한국전자통신연구원 2007 ETRI Journal Vol.29 No.1
Robust adaptive beamforming based on worst-case performance optimization is investigated in this paper. It improves robustness against steering vector mismatches by the approach of diagonal loading. A closed-form solution to optimal loading is derived after some approximations. Besides reducing the computational complexity, it shows how different factors affect the optimal loading. Based on this solution, a performance analysis of the beamformer is carried out. As a consequence, approximated closed-form expressions of the source-of-interest power estimation and the output signalto- interference-plus-noise ratio are presented in order to predict its performance. Numerical examples show that the proposed closed-form expressions are very close to their actual values.