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Kun Zhao,Fang He,Zhen Huang,Guoqiang Wei,Anqing Zheng,Haibin Li,Zengli Zhao 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6
The effects of Mn substitution of LaMnxFe1−xO3 (x=0, 0.3, 0.5, 0.7, 1.0) on the oxidation activity and resistance to carbon formation for chemical-looping steam methane reforming (CL-SMR) were investigated. The desired crystalline perovskite phases were formed by transferring from the orthorhombic structure of LaFeO3 to rhombohedral lattice of LaMnO3 as the degree of Mn-doping increased. Manganese ions have a mixed state of Mn3+ and Mn4+ in the LaFe1−xMnxO3, meanwhile inducing the states of highly mixed character of Fe2+, Fe3+ and Fe4+ in iron ions. Substitution of Mn for Fe with proper value not only increases the lattice oxygen, which is conducive to the partial oxidation of CH4 to produce syngas, but also enhances the lattice oxygen mobility from the bulk to the surface of the oxygen carrier particles. Judging from the points of the redox reactivity, resistance to carbon formation and hydrogen generation capacity, the optimal range of the degree of Mn substitution is x=0.3-0.5.
Study on Permeation Grouting Rules for Loess and Method for Predicting Migration Radius
Zai-kun Zhao,Tie-hang Wang,Xin Jin 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.8
Pressure grouting method can significantly enhance the strength of soil, and is widely used in foundation reinforcement. There already have some theoretical studies on pressure grouting, but the actual diffusion process of grouting can not be reflected exactly. Firstly, this paper conducts a field permeation grouting test on undisturbed loess of late pleistocene of quaternary, and acquires the pressure effected relationships of quantity vs. time. The test reveals that the grout quantity approximately increases linearly with the pressure until a certain grouting time point. The time point increases with grouting pressure and we try to define the pressure effected time point as the effective grouting time. After the effective grouting time, the grouting quantity remains constant due to the approaching of max migration radius and the stopping of grout migration. And then, considering the piston-like displacement effect of grout on porous mediums due to pressure, this study introduced the effective grouting time into the theoretical derivation process based on porous mediums’ fluid percolation pore pressure equation and Darcy’s law. The author combined the initial conditions and boundary conditions of pore pressure with the continuity conditions of permeation velocity, and performed the Boltzmann’s transformation and reduced-order processing to derive the equation for the migration velocity of the grout front and the migration radius of grout. Finally, by substituting the effective grouting time and the effective grouting quantity into the equation, we could obtain the grouting reinforcement radius. The equation can accurately predict the actual grouting reinforcement radius, and the applicability of the equation is verified by verification test.
광고의 언어적 수사 표현방식에 따른 소비자 반응 차이 연구: 소비자 지식수준을 중심으로
조곤 ( Zhao Kun ),이종민 ( Chong Min Lee ) 국민대학교 사회과학연구소 2015 社會科學硏究 Vol.28 No.1
본 연구의 목적은 광고의 언어적 수사 표현방식과 소비자 지식수준에 따라 소비자 반응에 있어 어떠한 차이가 발생하는지 살펴보는데 있다. 다시 말해, 지식수준(고 vs. 저)과 광고표현 방식(비유적 수사 표현 vs. 명시적 표현)사이의 상호작용 효과가 소비자 반응(회상력, 인지처리 깊이, 광고태도, 브랜드태도)에 어떠한 영향을 미치는지 조사하였다. 연구 결과에 따르면 소비자의 사전지식 수준과 광고 표현 방식사이의 상호작용 효과는 오직 회상에서만 존재하는 것으로 나타났다. 이 연구 결과는 회상과 관련된 선행 이론 및 가설들과 맥락을 같이하는 것으로 보인다. 다른 광고 반응 변인들과 관련해서는 상호작용효과가 나타나지 않았다. The purpose of the study is to examine the interaction effects between adrhetoric representation(verbal rhetoric representation vs. verbal explicit representation) and consumer knowledge level(high vs. low) on consumers’ ad response variables such ad recall, depth of ad processing, ad attitude and brand attitude). According to the results of the study, the interaction effect was found to be significant only in ad recall. This finding appears to be supported by the prior related theories and studies. On the other hand, there were no significant interaction effects in other ad response variables.
A Weibo Topic Tracking System based on K-means
Yun Liu,Kun-Peng Xia,Jian-Xun Zhao 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.6
This article studied weibo text representation. For the weibo features such as short, real-time, colloquialism and originality, in the original vector space model, we propose a suitable method for weibo text representation. Make all the content words as feature words after participation. And we proposed T-TFIDF weight calculation method according to the features of weibo. According to the vector space model, we proposed a weibo adaptive topic tracking methods based on K-means clustering. Simulation analysis shows that, the method can by comparing the similarity micro-blog and sub topic vector set, determine whether weibo belonging to the topic.
Chun Ling Zhao,Guang Ping Zhang,Zheng Zheng Xiao,Zhi Kun Ma,Cai Peng Lei,Shi Yuan Song,Ying Ying Feng,Ya Chao Zhao,Xiao Shan Feng 한국유방암학회 2015 Journal of breast cancer Vol.18 No.2
Purpose: We investigated whether recombinant human granulocyte colony-stimulating factor (rhG-CSF) could promote the development of preinvasive and invasive breast cancer in mouse mammary tumor virus (MMTV-erbB2) mice with estrogen receptor- positive tumors. Methods: MMTV-erbB2 mice were randomly divided into three experimental groups with 20 mice in each group. MMTV-erbB2 mice were treated with daily subcutaneous injections of vehicle or rhG-CSF (low-rhG-CSF group, rhG-CSF 0.125 μg; vehicle-rhG-CSF group, normal saline 0.25 μg; and high-rhG-CSF group, rhG-CSF 0.25 μg) at 3 months of age. Cellular and molecular mechanisms of G-CSF action in mammary glands were investigated via immunohistochemistry and reverse transcription polymerase chain reaction. Results: Low, but not high, rhG-CSF doses significantly accelerated mammary tumorigenesis in MMTV-erbB2 mice. Short-term treatment with rhG-CSF could significantly promote the development of preinvasive mammary lesions. The cancer prevention effect was associated with reduced expression of proliferating cell nuclear antigen, cluster of differentiation 34, and signal transducers and activators of transcription 3 in mammary glands by >80%. Conclusion: We found that G-CSF was regulated by rhG-CSF both in vitro and in vivo. Identification of G-CSF genes helped us further understand the mechanism by which G-CSF promotes cancer. Low doses of rhG-CSF could significantly increase tumor latency and increase tumor multiplicity and burden. Moreover, rhG-CSF effectively promotes development of both malignant and premalignant mammary lesions in MMTV-erbB2 mice.
Fengnan Lian,Dan Wang,Shuo Yao,Lirui Ge,Yue Wang,Yuyi Zhao,Jinbin Zhao,Xiuling Song,Chao Zhao,Jinhua Li,Yajuan Liu,Minghua Jin,Kun Xu 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.8
This research aimed to detect Escherichia coli O157:H7 in milk based on immunomagnetic probe separation technology and quenching effect of gold nanoparticles to Rhodamine B. Streptavidin-modified magnetic beads (MBs) were combined with biotin-modified antibodies to capture E. coli O157:H7 specifically. Gold nanoparticle (AuNPs) was incubated with sulfhydryl-modified aptamers (SH-Aptamers) to obtain the Aptamers-AuNPs probe. After magnetic beads captured target bacteria and formed a sandwich structure with the gold nanoprobe, Rhodamine B was added into complex to obtain fluorescent signal changes. Our results demonstrated that the established method could detect E. coli O157:H7 in the range of 101–107 CFU/mL, and the limit of detection (LOD) was 0.35 CFU/mL in TBST buffer (pH = 7.4). In milk simulation samples, the LOD of this method was 1.03 CFU/mL. Our research provides a promising approach on the detection of E. coli O157:H7.
Zhao, Yan-Jie,Jiang, Ni,Song, Qing-Kun,Wu, Jiang-Ping,Song, Yu-Guang,Zhang, Hong-Mei,Chen, Feng,Zhou, Lei,Wang, Xiao-Li,Zhou, Xin-Na,Yang, Hua-Bing,Ren, Jun,Lyerly, Herbert Kim Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.6
Background: There are few choices for treatment of advanced cancer patients who do not respond to or tolerate conventional anti-cancer treatments. Therefore this study aimed to deploy the benefits and clinical efficacy of continuous dendritic cell-cytokine induced killer cell infusions in such patients. Materials and Methods: A total of 381 infusions (from 67 advanced cases recruited) were included in this study. All patients underwent peripheral blood mononuclear cell apheresis for the following cellular therapy and dendritic cells-cytokine induced killer cells were expanded in vitro. Peripheral blood T lymphocyte subsets were quantified through flow cytometry to address the cellular immunity status. Clinical efficacy and physical activities were evaluated by RECIST criteria and Eastern Cooperative Oncology Group scores respectively. Logistic regression model was used to estimate the association between cellular infusions and clinical benefits. Results: An average of $5.7{\pm}2.94{\times}10^9$ induced cells were infused each time and patients were exposed to 6 infusions. Cellular immunity was improved in that cytotoxic $CD8^+CD28^+$ T lymphocytes were increased by 74% and suppressive $CD8^+CD28^-$ T lymphocytes were elevated by 16% (p<0.05). Continuous infusion of dendritic cells-cytokine induced killer cells was associated with improvement of both patient status and cellular immunity. A median of six infusions were capable of reducing risk of progression by 70% (95%CI 0.10-0.91). Every elevation of one ECOG score corresponded to a 3.90-fold higher progression risk (p<0.05) and 1% increase of $CD8^+CD28^-$ T cell proportion reflecting a 5% higher risk of progression (p<0.05). Conclusions: In advanced cancer patients, continuous dendritic cell-cytokine induced killer cell infusions are capable of recovering cellular immunity, improving patient status and quality of life in those who are unresponsive to conventional cancer treatment.