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Xiaoju Li,Luqman Chuah Abdullah,Shafreeza Sobri,Mohamad Syazarudin Md Said,Siti Aslina Hussain,Tan Poh Aun,Jinzhao Hu 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.4
The air pollution process and impact mechanism of megacities located in complex terrain are particularly complex. As a typical megacity in China, Chengdu has unique topographical and meteorological conditions, and its pollution control is difficult. This study systematically elucidated the variation characteristics of six criteria air pollutants in Chengdu between 2014 and 2020. Besides, the PM<SUB>2.5</SUB>/PM<SUB>10 </SUB>and NO₂/SO₂ ratios were discussed. Furthermore, a detailed analysis of the correlation between air pollutants was carried out. Finally, the collaborative path of carbon reduction and air pollution control is discussed. The results indicated that SO₂, PM<SUB>2.5</SUB>, PM<SUB>10</SUB> and CO were significantly decreased by 62.9%, 50.8%, 45.5%, and 36.7%, respectively. PM2.5 and O3 compliance rates are very low, and O₃ increases with fluctuations. SO₂, NO₂, CO, PM showed a “U-shaped” seasonal variation, and there was a “seesaw” phenomenon between O₃ and PM2.5. The continuous changing trends also found in the ratios of PM<SUB>2.5</SUB>/PM<SUB>10</SUB> and NO₂/SO₂. The results highlight the importance of coordinated reduction of carbon emissions and pollutants in Chengdu. This research can improve the prediction accuracy of air pollution in complex terrain areas under global warming, and improve the understanding of the formation mechanism of air pollution in special terrains around the world.
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Thirty Years of American Studies in China: An Overview and a Case Study
MEI Renyi,Li Jinzhao 서울대학교 미국학연구소 2012 미국학 Vol.35 No.2
This paper addresses the historical development and general characteristics of American Studies in China and examines its strengths and weaknesses with a case study of an American Studies graduate program in Beijing. The paper first provides an overview of the history of American Studies in China since 1979, the year that marked the normalization of the Sino-US diplomatic relationship and the institutionalization of American Studies as an academic field. Second, it summarizes the unique characteristics of American Studies in China and lists major challenges it now faces for further development. The third part uses the American Studies Center at Beijing Foreign Studies University, a flagship graduate-level study and research program in China, as a case study to examine more closely the accomplishments of the past 30 years and the challenges faced at the current stage. A questionnaire survey conducted among its alumni and a content analysis evaluation of all available M.A. theses demonstrate that the flagship program has its language strength and unique pedagogical accomplishments. However, the program has been uneven in disciplinary development and research training. The findings suggest that for further growth, the program should design more balanced curricula, put greater emphasis on research training, and incorporate more interdisciplinary or cross-disciplinary approaches into American Studies.
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( Mei Renyi ),( Li Jinzhao ) 서울대학교 미국학연구소 2012 미국학 Vol.35 No.2
This paper addresses the historical development and general characteristics of American Studies in China and examines its strengths and weaknesses with a case study of an American Studies graduate program in Beijing. The paper first provides an overview of the history of American Studies in China since 1979, the year that marked the normalization of the Sino-US diplomatic relationship and the institutionalization of American Studies as an academic field. Second, it summarizes the unique characteristics of American Studies in China and lists major challenges it now faces for further development. The third part uses the American Studies Center at Beijing Foreign Studies University, a flagship graduate-level study and research program in China, as a case study to examine more closely the accomplishments of the past 30 years and the challenges faced at the current stage. A questionnaire survey conducted among its alumni and a content analysis evaluation of all available M.A. theses demonstrate that the flagship program has its language strength and unique pedagogical accomplishments. However, the program has been uneven in disciplinary development and research training. The findings suggest that for further growth, the program should design more balanced curricula, put greater emphasis on research training, and incorporate more interdisciplinary or cross-disciplinary approaches into American Studies.
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Huiqin Wang,Xiaoqing Yang,Jinzhao Zi,Mingjun Zhou,Zhefei Ye,Jinze Li,Qingfeng Guan,Peng Lv,Pengwei Huo,Yongsheng Yan 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
Ag/AgCl/activated carbon (AC) plasmonic photocatalysts were prepared by precipitation and photoreduc-tion method. The as-prepared plasmonic photocatalysts were characterized by XRD, SEM, BET, EDS, UV–visDRS, XPS and PL. The results show the composite photocatalysts are successfully obtained and obviouslyexhibit surface plasmon resonance and effectively enhance the separation of h+/e . The photocatalyticdegradation rate of tetracycline (TC) could reach 97.3% in 60 min under visible light irradiation and cycledexperiments show stably photocatalytic activities. The active species analysis displays holes andsuperoxide radicals are the main reactive species. Photocatalytic kinetic indicates that the degradationprocesses obey pseudo first order kinetic equation.
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NoSQL Injection : Data Security on Web Vulnerability
Hemn B. Abdalla,Guoquang Li,Jinzhao Lin,Mustafa A. Alazeez 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.9
Web sites can be dynamic and static sometimes a combination of both. To assure security all the websites need protections to their database. This paper proposes a static analysis of various technique of detecting recently discovered web-based vulnerabilities such as cross-site scripting and HTTP splitting attacks with NoSQL injection. Today, the situation is¬ better, and traditional databases have introduced built-in protection mechanisms. But does this mean that NoSQL systems are immune to injections? Our study shows that although the security of the query language has largely improved; there are still techniques for injecting malicious queries. Some works already provide reports of NoSQL injection techniques. We also show the methods of accessing the dark web. We use TOR browser for the explanation of accessing dark web. The user entering into the website with different format rather than the original will be noticed, and they are not allowed to access our website. Instead of passing SQL queries into the input fields the user can also directly pass the objects inside it. Once the user enters in, with the actual format and attempts to upload .exe file the website tends to block that user's account.
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