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Corrosion of Ti3SiC2 in an Ar-1%SO2 atmosphere between 800 and 1100℃
Thuan Dinh Nguyen,Sang-Whan Park,이동복 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.3
Ti3SiC2 compounds were synthesized by a powder metallurgical route, and corrosion-tested at 800, 900, 1000 and 1100℃ for up to 50 h under an Ar-1%SO2 gas atmosphere. The scale formed consisted primarily of an outer rutile-TiO2 layer and an inner (rutile-TiO2 + amorphous SiO2)-mixed layer. Sulfur was mainly enriched at the scale-matrix interface. The corrosion progressed mainly via oxidation rather than sulfidation. Ti3SiC2 displayed excellent corrosion resistance due mainly to its high Si content that formed a SiO2 barrier layer. Ti3SiC2 compounds were synthesized by a powder metallurgical route, and corrosion-tested at 800, 900, 1000 and 1100℃ for up to 50 h under an Ar-1%SO2 gas atmosphere. The scale formed consisted primarily of an outer rutile-TiO2 layer and an inner (rutile-TiO2 + amorphous SiO2)-mixed layer. Sulfur was mainly enriched at the scale-matrix interface. The corrosion progressed mainly via oxidation rather than sulfidation. Ti3SiC2 displayed excellent corrosion resistance due mainly to its high Si content that formed a SiO2 barrier layer.
STS 304 스테인리스강의 대기중 1050~1200˚C, 1시간 동안의 산화
Thuan Dinh Nguyen,이동복 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.4
The STS304 stainless steel was oxidized isothermally and cyclically at temperatures between 1050 and 1200˚C for 1 hr in air. During isothermal oxidation, it displayed good oxidation resistance at 1050˚C. However, it suffered from breakaway oxidation above 1100˚C, being accompanied with internal oxidation. During cyclic oxidation, it also displayed good oxidation resistance at 1050˚C, but it suffered from massive weight loss above 1125˚C. The oxide scales formed consisted primarily of Fe2O3, Fe3O4 with and without Cr2O3. They were generally non-adherent.
Dinh Bang Nguyen,Thanh Phuong Dao,Hung Thuan Tran,Van Noi Nguyen,안대희,Thi Dieu Cam Nguyen 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
The aim of this study is to evaluate phenol degradation capability of silver modified titanium dioxide nanomaterial on bentonite support (Ag-TiO2/Bent). The material was synthesized as photocatalyst by adding Ag-TiO2 sol into bentonite suspension. The experimental results revealed that photooxidation activity of Ag-TiO2/Bent was greatly higher than that of Ag-TiO2 and TiO2/Bent. The phenol removal efficiency was 23.25%, 35.41% and 98.94% for Ag-TiO2, TiO2/Bent and Ag-TiO2/Bent, respectively. The dispersion of silver modified TiO2 on bentonite support significantly enhances photocatalytic activity under solar radiation due to surface plasmon resonance formation and prevention of anatase-to-rutile phase transformation.
Van Noi Nguyen,Thi Dieu Cam Nguyen,Thanh Phuong Dao,Hung Thuan Tran,Dinh Bang Nguyen,안대희 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
Organoclays were synthesized by exchanging inorganic cations between layers in Thanh Hoa bentonite using organic cations including benzylhexadecyldimethylammonium (BHDDM+), dimethyldioctadecylammonium (DMDOD+) and benzylstearyldimethylammonium (BSDM+). Inserting organic cations increases material interlayer distance significantly (from 15 A˚ to 40 A˚ ) and simultaneously enhances affinity of materials toward organic pollutants. The results show that adsorption capacity of organics on organoclays strongly depends on affinity between organic substances and ammonium cations rather than on interlayer distance of organoclays. This means that the sorption of organoclays for organic contaminants was significantly influenced by the nature of the surfactants added to the clay.
( Nguyen Xuan Xinh ),( Dinh-thuan Do ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.4
This paper investigates a protocol so-called Adaptive Harvest Then Transmit (AHTT) for wireless powered communication networks (WPCNs) in multiple-input single-output (MISO) downlink systems, which assists in transmitting signals from a multi-antenna transmitter to a single-antenna receiver. Particularly, the power constrained relay is supplied with power by utilizing radio frequency (RF) signals from the source. In order to take advantage of multiple antennas, two different linear processing schemes, including Maximum Ratio Combining (MRC) and Selection Combination (SC) are studied. The system outage capacity and ergodic capacity are evaluated for performance analysis. Furthermore, the optimal power allocation is also considered. Our numerical and simulation results prove that the implementation of multiple antennas helps boost the energy harvesting capability. Therefore, this paper puts forward a new way to the energy efficiency (EE) enhancement, which contributes to better system performance.
An Analysis of the Meaning Enshrined in the Architecture of the Tay Ninh Holy See of Cao Dai
NGUYEN, Phuoc Tai,DINH, Van Thuy,NGUYEN, Thuan Quy,TRAN THI, Kim Hoang DAOS(The Daesoon Academy of Sciences) 2022 Journal of Daesoon Thought and the Religions of Ea Vol.2 No.1
In the 1920s, a new religion emerged in Tay Ninh Province, Southern Vietnam, under the name Caodaism; also known as the Third Universal Salvation of the Great Dao. It is the result of the typical combination of three main religions (Buddhism, Daoism, and Confucianism). Different ethnic groups populated Tay Ninh, such as Chinese, Khmer, Cham, and Kinh. Additionally, the core principle of Caodaism is known as The Three Religions Returned to the Origin, and it is also expanded as The Five Branches Reunited. The Five Branches are humankind's five ways of self-cultivation: the Way of Humans, the Way of Deities, the Way of Saints, the Way of Immortals, and the Way of Buddhas. Although Caodaism was only founded in 1920, this religion is well known domestically and internationally. This is because Caodaism has a distinctive identity; it is a new religion that advocates a syncretistic combination of essential religious teachings that follow the harmonization and reconciliation between the East and West as well as between the past and present. Moreover, the Tay Ninh Holy See is the most important, first, and largest Cao Dai temple in Vietnam. The temple is located in Tay Ninh Province in southwestern Vietnam. This article aims to introduce the Tay Ninh Holy See as the birthplace of Caodaism and as the largest Cao Dai religious palace, not only in Vietnam but also in other countries that practice Caodaism. A brief overview of Tay Ninh Holy See's origin, history, and planning will be provided. Most importantly, the style of the architecture at the Tay Ninh Holy See will be comprehensively analyzed to shed more light on the meaning of each section and the details of this temple structure.
Comments on the high temperature oxidation characteristics of Ti3SiC2 in air
이동복,Thuan Dinh Nguyen,Jung-Ho Choi,박상환 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.6
The high temperature oxidation characteristics of Ti3SiC2 have been studied extensively before. However, we believe that there are still the ambiguous points concerning the scale structure and oxidation mechanism of Ti3SiC2. Hence, the oxide scales formed, the distribution and roles of Ti, Si and C in the scale, and the oxidation mechanism are discussed based on the results obtain from this and previous studies. In this study, Ti3SiC2 compounds were produced via a powder metallurgical process, oxidized between 900 and 1200 oC in air for up to 100 h, and the oxidation characteristics are discussed.