Bulk Synthesis of Fe3Al Intermetallic Compound Nanoparticles by Flow-Levitation Method

Shan-Jun Chen,Song Li,Yang-En Wang,Hui Zeng,Yong-Jian Tang,Wei-Guo Sun,Yan Chen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.1

Metallic nanopowders have an increasing application in magnetic materials, catalysts and chemical and metallic industries. In this research, a novel bulk synthesis method for preparing high pure intermetallic Fe3Al nanoparticles was developed by flow-levitation (FL) method. The Fe and Al vapors ascending from the high-temperature levitated droplet were condensed by cryogenic argon gas under atmospheric pressure. X-ray diffraction (XRD) and selected-area electron diffraction (SAED) were used to identify and characterize the prepared nanopowders exhibiting a Fe3Al phase. Measurement of transmission electron microscopy (TEM) indicated that the Fe3Al particles are nearly spherical, and the particle size of the compound ranges from 10 nm to 200 nm in diameter. The chemical composition of the nanoparticles were determined with energy dispersive spectrometer. The magnetic properties of the nanopowder indicate that Fe3Al intermetallic compound is a soft magnet at room temperature, with coercivity of 24.2 Oe and saturation magnetization of 173.2 emu/g. The production rate of Fe3Al nanoparticles was estimated to be about 4 g/h in a continuous manner, by using the FL method. This method as great potential in mass production of Fe3Al nanoparticles.

Effects of Biochar and the Geophagous Earthworm Metaphire Guillelmi on Fate Of 14c-Catechol in an Agricultural Soil

Jun Shan,Xiaoyuan Yan 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Analysis of non-point and point source pollution load in DongPieHong Ditch

Shan, Yu,Chen, Jun,Jin, Jie,Song, YongLian,Liu, Jun,Wu, DongBiao,Wu, Ke Urban Science Institute 2019 도시과학 Vol.8 No.2

In this study, the DongPieHong Ditch were taken as the research object, five sampling points were set to measure the COD, NH₃-N,TNandTPindexes. The correlation and principal component analysis were used to judge the main pollution sources and calculate pollution contribution rate. According to the population in the basin, the load of point source pollution into the river was estimated. As a result, the load of COD, NH₃-N and TP into the river was 323.04t/a, 43.8t/a and 3.9t/a, respectively. According to the statistics of the rainfall in the basin, the concentrations of COD, TP and NH₃-N in the initial rainwater were measured and calculated for non-point source pollution, and the results shown that the inflow loads of COD, NH₃-N and TP into the river were 34.59t/a, 0.12t/a and 0.71t/a, respectively. It was found that the main cause of the pollution in the east flash flood gully was point source pollution, and the proportions of COD, NH₃-N and TP into the river were 90.33%, 99.72% and 84.61%, respectively.

Recent developments of maritime law : Summary and Appraisal: Ship Collision Compensation Regime of China

( Shan Hong Jun ),( Yu Shi Hu ),( Zhang Hong Ka ) 고려대학교 법학연구원 2011 The Asian Business Lawyer Vol.8 No.-

Generally speaking, collision of ships is a typical maritime tort which will lead to enormous property damage, serious personal injury or death as well as marine environmental pollution. In certain circumstances, wreck under water resulting from collisions at sea will also pose threat to the safety of the navigation and marine environment. In order for the prevention of collisions and the regulation of the damages in relation to collisions, a series of statutes and rules have been enacted by Chinese government after the relevant international conventions come into force in China. In addition, the Chinese Supreme Court has promulgated several judicial interpretations in this field. This article is the brief summary and appraisal of the ship collision compensation regime of China. This article covers almost all of the issues relating to a ship collision compensation regime. Specifically, the sources of law, definition of collision given by China Maritime Code, the party liable for the collision, the party entitled to prosecute the claims, the liability rule, the exemptions, the admissible damages, the assessment of the damage, the maritime liens, the limitation of liability for maritime claims, the jurisdiction and the prelitigation arrest of ships, the insurance claim and the litigation, the auction of ship, the application of law where foreign elements involved and the time limit, etc, are the key issues addressed by this article.

태극권 운동이 여성치매노인의 인지기능 및 기능체력에 미치는 영향

오산산 ( Shan Shan Wu ),강동근 ( Dong Keun Kang ),계홍경 ( Hong Qing Ji ),박정준 ( Jung Jun Park ) 한국운동생리학회 2015 운동과학 Vol.24 No.2

PURPOSE: The purpose of this study was to examine the effects of Tai Chi on cognitive function and functional fitness in elderly women with dementia. METHODS: The subjects were 40 elderly women with dementia, aged over 65 years old. They were randomly divided into Tai Chi group (TG, n=20) and control group (CG, n=20). Tai Chi exercise was composed of 60 min/day, 3 days/week, for 12 weeks. The intensity of Tai Chi exercise was 10-11 RPE for week-1 to 6 and 12-13 RPE for week-7 to 12. Before and after Tai chi exercise training, Mini-Mental State Examination-Korea (MMSE-K) test and Senior Fitness Test (SFT) were performed to measure cognitive function and functional fitness, respectively. SPSS Ver. 21.0 was used for statistical analysis. RESULTS: After 12 weeks of Tai Chi exercise program, there was a significant interaction between group and time in MMSE-K (p <.001). TG significantly increased MMSE-K (p <.001), but CG did not. There were also significant interactions between group and time in arm curl (p=.028), chair sit-and-reach (p <.001), 6-min walking (p <.001), and 2.44 m up-and-go (p <.001). TG significantly improved chair sit-and-reach test (p <.001), 6-min walking test (p <.001), and 2.44 m up-and-go test (p <.001), but did not change others. In CG, however, arm curl (p <.001), 30-second chair stand (p=.028), back scratch (p=.01), chair sit-and-reach (p <.001), 6-min walking (p <.001), and 2.44 m up-and-go (p <.001) had gotten worse significantly. The change in MMSE-K was not related with the changes in any functional fitness. CONCLUSIONS: Our findings indicate that cognitive function and most of functional fitness in elderly women with dementia can be improved by Tai Chi exercise, but can become worse without exercise in even 12 weeks. Thus, it suggests that Tai Chi is a good exercise to be recommend to elderly women with dementia to improve their cognitive function as well as functional fitness.

문화 교류 인식과 국가의 지도자 이미지가 국가브랜드에 미치는 영향

유산산 ( Shan Shan Liu ),전종우 ( Jong Woo Jun ) 전남대학교 사회과학연구소 2020 현대사회과학연구 Vol.24 No.-

본 연구는 외래문화를 도입할 때 자국민들이 받아들일 수 있는 정도, 한중 간 분쟁해결에 대한 인식, 중국 문화콘텐츠 이용 정도, 중국 국가지도자인 시진핑에 대한 인식과 태도를 살펴보고, 이러한 변인들이 한국인들의 중국에 대한 태도와 방문의도에 어떠한 영향을 미치는지 알아보고자 한다. 그에 따라 양국 간의 우호적인 관계 회복에 필요한 요소들을 제시하고자 한다. 연구를 위해 총8개의 독립변인을 선택하여 위계적 회귀분석을 통해 가설을 검증하였다. 독립변인으로는 다른 나라의 문화를 받아들이는 정도로서 문화유입 수용성과 국가 간의 분쟁문제해결에 대한 인식, 중국 콘텐츠 이용 정도를 선택하였다. 국가지도자 이미지 관련변인으로는 시진핑 공신력과 시진핑에 대한 태도를 활용하였으며, 추가적으로 기본적 인구통계학적 변인인 성별, 연령 등을 사용하였다. 수집된 자료는 SPSS 21.0을 사용하여 분석하였다. 문화유입 수용성과 중국 콘텐츠 이용, 그리고 시진핑에 대한 태도가 중국 국가태도에 긍정적인 영향을 미치는 것으로 나타났다. 또한 연령, 분쟁문제해결 인식, 중국 콘텐츠 이용, 시진핑에 대한 태도가 중국 방문의도에 정적인 영향을 미치는 것으로 검증되었다. 결과적으로 연구 내에서 타국의 문화와 지도자 이미지에 대한 인식은 해당 국가에 대한 태도와 방문 의도에 영향을 미치는 것으로 확인하였다. 본 연구는 국가브랜드를 형성하는 요소로 문화와 지도자의 역할을 제안함으로써 연구와 실무에 시사점을 제공하고자 한다. The study sought to explore the impact of Koreans' cultural awareness of China and Chinese national leader Xi Jinping's perception of China on attitudes and willingness to visit China. As a demographic variable, gender and age were used, and cultural inflow acceptance variables were utilized as a degree of acceptance of culture in other countries. In the event of trouble-fighting among countries, the perception of problem-solving was also chosen as one of the variables, and the level of use of Chinese content was prescribed in the amount and frequency of Korean people using Chinese cultural products. Finally, regarding the national leader's image, Xi Jinping's public confidence and attitude toward Xi Jinping were utilized. A total of eight independent variables have an impact on China's state attitude and willingness to visit China. Tests of hypotheses using hierarchical regression have shown that acceptance of culture, use of Chinese contents, and attitude toward Xi Jinping have positive effects on China's national attitude. As a result, the better the cultural perception of China and attitude toward Chinese leader Xi Jinping, the more positive China's attitude and willingness to visit the country is overall. It aims to provide implications for research and practice by proposing the role of culture and leader as elements that shape the national brand.

Age-Related CD4<SUP>+</SUP>CD25<SUP>+</SUP>Foxp3<SUP>+</SUP> Regulatory T-Cell Responses During Plasmodium berghei ANKA Infection in Mice Susceptible or Resistant to Cerebral Malaria

Ying Shan,Jun Liu,Yan-Yan Pan,Yong-Jun Jiang,Hong Shang,Ya-Ming Cao 대한기생충학열대의학회 2013 The Korean Journal of Parasitology Vol.51 No.3

Expression of Connexin 43 and E-cadherin Protein and mRNA in Non-small Cell Lung Cancers in Chinese Patients

Zhao, Jun-Qiang,Sun, Fang-Jie,Liu, Shan-Shan,Yang, Jun,Wu, Yu-Quan,Li, Gui-Shan,Chen, Qing-Yong,Wang, Jia-Xiang Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.2

Aim: Connexin 43 (Cx43) and E-cadherin are important biomarkers related with cancer. Their expression at protein and mRNA levels was here investigated in 50 primary lung carcinoma tissues and 20 samples of adjacent normal tissue of Chinese patients with non-small cell lung cancer (NSCLC). Methods: Protein and mRNA expression were evaluated by ABC immunohistochemistry and RT-PCR. Results: (1) The positive expression rates of Cx43 and E-cadherin protein were higher in the adjacent normal tissues than those in the primary lung carcinoma tissues; (2) the positive expression rates of Cx43 and E-cadherin protein decreased with NSCLC progression; (3) the expression of E-cadherin protein was not related with the pathological type of NSCLC; and (4) the relative quantity of the Cx43 or E-cadherin mRNA expression was correlated with the the histological type, clinical stage, cancer cell differentiation and the lymph node metastasis. Conclusion: The data suggested that the Cx43 and E-cadherin are reduced with NSCLC progression, and might be important biomarkers for judging the metastasis and prognosis.

An intelligent hybrid methodology of on-line system-level fault diagnosis for nuclear power plant

Min-jun Peng,Hang Wang,Shan-shan Chen,Genglei Xia,Yong-kuo Liu,Xu Yang,Abiodun Ayodeji 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.3

To assist operators to properly assess the current situation of the plant, accurate fault diagnosis methodologyshould be available and used. A reliable fault diagnosis method is beneficial for the safety ofnuclear power plants. The major idea proposed in this work is integrating the merits of different faultdiagnosis methodologies to offset their obvious disadvantages and enhance the accuracy and credibilityof on-line fault diagnosis. This methodology uses the principle component analysis-based model andmulti-flow model to diagnose fault type. To ensure the accuracy of results from the multi-flow model, amechanical simulation model is implemented to do the quantitative calculation. More significantly,mechanism simulation is implemented to provide training data with fault signatures. Furthermore, oneof the distance formulas in similarity measurementdMahalanobis distancedis applied for on-line failuredegree evaluation. The performance of this methodology was evaluated by applying it to the reactorcoolant system of a pressurized water reactor. The results of simulation analysis show the effectivenessand accuracy of this methodology, leading to better confidence of it being integrated as a part of thecomputerized operator support system to assist operators in decision-making.

Synthesis of 6-Alkyloxyl-3,4-dihydro-2(1H)-quinoliones and Their Anticonvulsant Activities

Quan, Zhe Shan,Wang, Jun-Min,Rho, Jung-Rae,Kwak, Kyung-Chell,Kang, Hee-Cheol,Jun, Chang-Soo,Chai, Kyu-Yun Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.11

A series of 6-alkyloxyl-3,4-dihydro-2(1H)-quinoliones (5a-5n) were synthesized through nitration, reduction, diazotization, hydrolysis and alkylation from 3,4-dihydro-2(1H)-quinolione. Their structures were characterized by IR, $^1H$-NMR and MS. The anticonvulsant activity was evaluated by the Maximal electroshock test (MES) and the subcutaneous pentylenetetrazole (Metrazole) test (sc-Met). The neurotoxicity was measured by the Rotarod test (Tox). The result showed that 6-hexyloxy-3,4-dihydro-2 (1H)-quinolinone (5c) was potent in anti-MES and anti-scMet test with $ED_{50}$ of 24.0 mg/kg and 21.2 mg/kg, respectively, albeit its $TD_{50}$ (67.6 mg/kg) revealed the high neurotoxicity. 6-Benzyloxy-3,4-dihydro-2(1H)-quinolinone (5f) was less effective against MES induced seizure with $ED_{50}$ of 29.6 mg/kg, but no neurotoxicity was observed even under 300 mg/kg. Its Protective index (PI) was greater than 10 preferable to Phenytoin, Carbamazepin, Phenobarbital and Valproate.