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Huan Li,Wenlong Yang,Zhongxiang Zhou,Hao Tian 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
The structure, microstructure, and piezoelectric properties of conventionally sintered Yb-doped K0.5Na0.5NbO3(KNN) lead-free ceramics were investigated. Doping the KNN ceramics with Yb2O3 was effective in inhibiting the grain growth in the KNN ceramics and in densifying the ceramics. The 1.0 wt. % Yb-doped KNN ceramics showed the maximum density, about 96.8% of the theoretical density. X-ray diffraction analysis showed that a small number of Yb3+ ions could be incorporated into the matrix of the ceramicsto occupythe α- or β-sites in the crystal lattice, thereby significantly affecting the piezoelectric properties of the ceramics. Enhanced piezoelectric properties (i.e., d33= 135 pC/N, kp = 34.5%, and Qm = 80.2) were obtained for the 0.50 wt. %Yb-doped KNN ceramics.
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Study on Fiber Cutting Performance of Isometric Straight Bar Plate with Different Bar Angle
Huan Liu,Jixian Dong,Xiya Guo,Chong Luo,Xiaohui Tian,Xiaojun Jiang,Sha Wang,Ruifan Yang,Chuanwu Duan,Bo Wang,Kai Qi 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.5
The refining plate is a direct-acting component of refiners in pulping, and the bar profile of it have a major impact on fiber cutting, which affects the paper forming and strength of the formed paper. In this paper, the fiber average length, the fiber length distribution, the original fiber cutting rate and adjacent fiber cutting rate of samples collected in different refining time are used to analyze the fiber cutting mechanism of the isometric straight bar refining plates with different bar angles. The results show that the fiber cutting performance of plates gradually decreases and the limit fiber cutting length of the plate increases with the increase of the bar angle which is opposite to the conclusion predicted by specific edge load (SEL). However, the fiber cutting action of plates is gradually weakened until the average fiber length is reduced to the limit cutting length of plates. Meanwhile, the cutting mechanism of the straight bar plates with different bar angles is different. The larger bar angle of plate, the lower fiber cutting rate and the adjacent cutting rate of which is basically kept constant during refining, while the adjacent cutting rate of smaller bar angle plate on fibers gradually decreases with refining and finally remains constant. The study on the cutting performance of different bar angle plates has positive significance for the selection and design of refining plates for different pulping process.
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Refining Characteristics of Hardwood Pulp Using Straight- and Curved-bar Plates: A Time Series Study
Huan Liu,Jixian Dong,Xiaojun Jiang,Chong Luo,Xiaohui Tian,Ruifang Yang,Litao Zhang,Bo Wang,Yan Yan 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.5
There are obvious differences in the refining characteristics of plates with straight bars compared to curved bar plates having the same bar parameters during refining. The objective of this research is to explore the difference in the refining characteristics of the straight bar and curved bar plates on experimental and theoretical studies. The bar angle of the curved bar plate is defined, and the two plates are used in the refining of bleached sulphate eucalyptus pulp (BSEP). Samples at different refining times were collected, and the properties of the fibers, pulp, and paper were detected and analyzed. It was found that the curved bar and straight bar plates have a similar influence on the pulp SR freeness. However, the curved bar plate effectively retained the fiber length, which means that its fiber cutting effect is weaker than that of the straight bar plate. Meanwhile, the fiber external fibrillation of the samples refined by the curved bar plate was better than that of the samples refined by the straight bar, which showed a higher tensile and tear index of the formed paper. Through the theoretical analysis of refining intensity via characterization of the parameter bar edge length (BEL), the specific edge load (SEL) of the curved bar plate was lower, and the refining characteristics predicted by the refining intensity were similar to the results from the experiments conducted in this paper.
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Huan Wang,Hongsheng Ouyang,Yaping Tian,Zhuang Liu,Xiaolei Han,Xingxing Liu,Guangyao Ran,Gangqi Wang,Daxin Pang,Xiaochun Tang 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.4
Nitroalkene derivatives of nitro-oleic acid(OA-NO2) regulate pluripotent cell signaling in vivo underphysiological and pathological conditions. Angiotensin IItype 1 receptor (AT1R) plays an important role in thecardiovascular system. In this study, OA-NO2 reduced theAT1R mRNA level, specifically in primary smooth musclecells, showing a 70% reduction in rat smooth muscle cells(RASMCs) and a 50% reduction in pig smooth musclecells (PASMCs). These effects were not observed in CHOcells, which highly express AT1R. The AT1R mRNA decayrate was unchanged after OA-NO2 compared with OAtreatment. Nitric oxide (NO) and peroxisome proliferatoractivatedreceptor gamma (PPARγ) did not alter thereduced effects of OA-NO2 on the AT1R mRNA level inSMCs. However, Sp1-mediated activation of the AT1Rpromoter was reduced in response to OA-NO2 in RASMCsbut not 293T cells. In addition, the nuclear factor-kappa B(NF-κB) pathway was involved in the OA-NO2-mediateddownregulation of AT1R transcription in SMCs. Takentogether, our results demonstrate that OA-NO2 specificallyinhibits AT1R mRNA expression in primary smooth musclecells via the NF-κB pathway.
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Huan-Yong Ji,Yong-Sheng Jin,Jing Li,Hui Tian,Shang-Zheng Feng 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.11
As market competition continuously intensifies, how to cope with existing and potential market challenges in complex, dynamic environments is a major problem haunting Chinese e-commerce enterprises in their strategic planning. In order to solve this problem, the theory of organizational ambidexterity is applied in this paper to the strategic practices of Chinese e-commerce enterprises, and starting from the view of corporate leadership, the mediated role of top management’s behavioral integration (referred to as TMBI in the following content) in the relationship between transformational leadership behavior and organizational ambidexterity is discussed. In addition, against the practical background that Chinese e-commerce enterprises are facing highly competitive environments, further clarification is made herein by using environmental dynamics as the moderator variable for the mediated link. Through empirical tests on 198 samples of Chinese e-commerce enterprises, we find that: 1) transformational leadership has a positive influence on organizational ambidexterity, and TMBI plays a full mediated role in that influencing process; 2) environmental dynamics moderates the relationship between transformational leadership and TMBI, but don’t have a moderated effect on the relationship between TMBI and organizational ambidexterity. According to the research conclusion in this paper, the mechanism of transformational leadership influencing organizational ambidexterity can be better explained when two important factors, TMBI and environmental dynamics, are taken into consideration. The research in this paper provides not only important revelations for the development of organizational ambidexterity research as well as the application of relevant research achievements, but also supports for Chinese e-commerce enterprises’ effective strategic practices in theory.
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Liu Huan,Miao Yu,Tian Huayu,Chen Yishan,Wang Enfu,Huang Jingda,Zhang Wenbiao 한국탄소학회 2024 Carbon Letters Vol.34 No.3
Moso bamboo, as a kind of renewable functional material, exhibits outstanding development potential. It is promising to prepare activated carbon with good mechanical strength and high specific surface area using moso bamboo as raw material. In this work, we employed a hydraulic extruder to extrude the bamboo charcoal and the adhesive to obtain the moso bamboo activated carbon, and improved the specific surface area of the columnar activated carbon through high-temperature water vapor activation. Through the catalytic role of the water vapor activation process, the formation and expansion of the pores were promoted and the internal pores were greatly increased. The obtained columnar activated carbon shows excellent mechanical strength (93%) and high specific surface area (791.54 m2/g). Polyacrylamide@asphalt is one of the most effective adhesives in the high-temperature water vapor activation. The average pore size (22.99 nm) and pore volume (0.36 cm3/g) of the prepared columnar activated carbon showed a high mesoporous ratio (83%). Based on the excellent pore structure brought by the activation process, the adsorption capacity of iodine (1135.75 mg/g), methylene blue (230 mg/g) and carbon tetrachloride (64.03 mg/g) were greatly improved. The resultant moso bamboo columnar activated carbon with high specific surface area, excellent mechanical properties, and outstanding adsorption capacity possesses a wide range of industrial applications and environmental protection potential.
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Xiaoshan Zhang,Yu Huan,Yuanna Zhu,Hui Tian,Kai Li,Yanan Hao,Tao Wei 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.12
Ferroelectric particles have been applied in the photocatalytic field because the spontaneous polarization results in the internal electric field, which can accelerate the separation and migration of photogenerated carriers. In this study, the BaTiO3 (BT) fibers are synthesized by electrospinning. The BT fibers calcined above 800 ℃ exhibit a strong ferroelectric property, which is verified by a typical butterfly-shaped displacement-voltage loop. It is found that the BT fibers with the single-domain structure exhibit better photocatalytic performance than that with the multi-domain configuration. When the single-domain transforms into multi-domain, the integrated internal electric field correspondingly breaks up, inducing that the internal electric field might cancel each other out and diminish the separation of photogenerated carriers. Also, the Au nanoparticles can improve the photocatalytic activity further on account of the surface plasmon resonance. Therefore, it is suggested that Au nanoparticles decorated on ferroelectric BT nanomaterials are promising photocatalysts.
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Cai Han-Jie,Jia Huan,Qi Xin,Lin Ping,Zhang Sheng,Tian Yuan,Qin Yuanshuai,Zhang Xunchao,Yang Lei,He Yuan 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.7
The dense granular flow spallation target is a new target concept proposed for an Accelerator-Driven Sub-critical (ADS) system. In this paper, the beam-target configurations of a tungsten granular flow target for the ADS with a thermal power of 1 GW is explored. The beam profile options using different scanning methods are discussed. The critical geometry parameters are adjusted to investigate the performance of the granular target from the aspects of neutron efficiency, stability and temperature distribution in target medium. To figure out how the target under accident conditions would behave, different clogging conditions are induced in the simulation. The dynamic processes are analyzed and some important parameters such as abnormal temperature rise and beam cutoff time window are obtained. The response of the sub-critical reactor to a clogging accident is also investigated. It is indicated that the monitoring of the granular flow by the neutron detectors in the sub-critical core will be effective
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Yan, Zheng-Fei,Trinh, Huan,Moya, Gabriela,Lin, Pei,Li, Chang-Tian,Kook, MooChang,Yi, Tae-Hoo Microbiology Society 2017 International journal of systematic and evolutiona Vol.67 No.10
<P>A Gram-negative, aerobic, non-motile, long rods or coccoid without flagellum strain, designated THG-YS3.2.7(T), was isolated from therhizosphere soil of a Mugunghwa flower collected from Kyung Hee University, Yongin, South Korea. Growth occurred at 10-40 degrees C (optimum 28-37 degrees C), at pH 6-8 (optimum 7) and at 0-5% NaCl (optimum 1 %). The predominant ubiquinone was ubiquinone 8 (Q-8). The major cellular fatty acids were C-10 : 0, C-10 : 0 3OH, C-16 : 0, C-17 : 0, C-17 : 0 cyclo, C-18 : 0, C(18 : 3 omega)6c (6,9,12), summed feature 3 (C-16 (: 1)omega 7c and/or C-16 : 1 omega 6c) and summed feature 8 (C-18 : 1 omega 7c and/or C-18 : 1 omega 6c). The major polar lipids were diphosphatidylglycerol (DPG), phosphatidylglycerol (PG), phosphatidylethanolamine (PE), phosphatidylcholine (PC). The DNA G+C content of strain THG-YS3.2.7(T) was 69.4 mol%. Based on 16S rRNA gene sequence analysis, the nearest phylogenetic neighbours of strain THG-YS3.2.7(T) were identified as Ramlibacter henchirensis DSM 14656(T) (97.92 %), Ramlibacter tataouinensis DSM 14655(T) (97.90 %), Ramlibacter solisilvae KACC 17567(T) (97.04 %). DNA-DNA hybridization values between strain THG-YS3.2.7(T) and R. henchirensis DSM 14656(T), R. tataouinensis DSM 14655(T), R. solisilvae KACC 17567(T) were 32.5 +/- 1.5, 43.1 +/- 1.1, 42.8 +/- 1.1 %, respectively. On the basis of the phylogenetic analysis, chemotaxonomic data, physiological characteristics and DNA-DNA hybridization data, strain THG-YS3.2.7(T) represent a novel species of the genus Ramlibacter, for which the name Ramlibacter rhizophilus sp. nov. is proposed. The type strain is THG-YS3.2.7(T) (= KCTC 52083(T) = CCTCC AB 2015357(T)).</P>
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