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( Phan Tuan Ngoc ),공민경,( Ranjith Thangavel ),이윤성,고창현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
We fabricated ordered mesoporous carbon materials (OMCs, CMK-3 and CMK-8) via a nano-casting method using mesoporous silica as the template materials and furfuryl alcohol (FA) as a carbon source. The OMCs showed a higher specific capacitance than the microporous carbon samples obtained by the carbonization of FA without templates. The enhancement of the specific capacitance may come from the mesopores of OMCs. The large pores and high specific surface area of OMCs are beneficial for the fast electrolyte transportation and high ion storage capability during the charge-discharge process. Moreover, CMK-3 (prepared using SBA-15) exhibited better EDLC performance than CMK-8 (prepared using KIT-6). CMK-3 possessed the long straight channels, which facilitate lower internal resistance and a larger number of ion-transport pathways than CMK-8 with the Ia3d cubic channels. The EDLC performance of carbon-based materials strongly depends on the mesopore structure and the mesoporous surface area.
Ordered mesoporous carbon CMK-8 cathodes for high-power and long-cycle life sodium hybrid capacitors
Phan, Tuan Ngoc,Gong, Min Kyung,Thangavel, Ranjith,Lee, Yun Sung,Ko, Chang Hyun Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.743 No.-
<P><B>Abstract</B></P> <P>Electrochemical energy storage (EES) devices with simultaneous high energy and high power output are critical in next-generation smart applications. Sodium hybrid capacitors (NHCs) are relatively new devices integrating the functions of batteries and capacitors. Research on capacitor-type carbon electrodes in NHCs is necessary to improve the energy-power behavior. Herein, we study ordered mesoporous carbon (OMC) materials synthesized at different temperatures (600 °C, 750 °C, and 900 °C) utilizing the KIT-6 silica template applied as adsorption cathodes for NHCs, paired with the superionic conductor Na<SUB>3</SUB>V<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB> as the anode material. Raman measurement indicates that the degree of graphitization is maximized at 750 °C. As a result, the OMC carbonized at 750 °C delivered the best performance among three OMCs, with a high energy density (54 W h kg<SUP>−1</SUP>), high power (2200 W kg<SUP>−1</SUP>) and superior stability (5000 cycles). The current research demonstrates a new platform for utilizing OMCs as adsorption electrodes in NHCs to realize a high-energy, high-power, and highly stable storage devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ordered mesoporous carbon materials (CMK-<I>x</I>) were fabricated by a facile template method. </LI> <LI> CMK-<I>x</I> carbonized at different temperatures were utilized as cathode materials for sodium hybrids capacitors. </LI> <LI> CMK-750 exhibited better electrochemical performance than CMK-600 and CMK-900. </LI> <LI> Higher degree of graphitization in carbon structures results in the better electrochemical performances. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Mental Health Among Healthcare Workers During the COVID-19 Pandemic in Vietnam
Nhan Phuc Thanh Nguyen,Ha Phan Ai Nguyen,Cao Khoa Dang,Minh Tri Phan,Huynh Ho Ngoc Quynh,Van Tuan Le,Chinh Van Dang,Tinh Huu Ho,Van Trong Phan,Van Trong Phan,Thang Phan,Dang Thi Anh Thu 대한예방의학회 2024 예방의학회지 Vol.57 No.1
Objectives: The objective of this study was to characterize mental health issues among Vietnamese healthcare workers (HCWs) and to identify related factors.Methods: A cross-sectional study was conducted with 990 HCWs in 2021. Their mental health status was measured using the Depression, Anxiety, and Stress Scale.Results: In total, 49.9%, 52.3%, and 29.8% of respondents were found to have depression, anxiety, and stress, respectively. The multivariable linear regression model revealed that factors associated with increased anxiety scores included depression scores (β, 0.45; 95% confidence interval [CI], 0.39 to 0.51) and stress scores (β, 0.46; 95% CI, 0.41 to 0.52). Factors associated with increased depression scores included being frontline HCWs (β, 0.57; 95% CI, 0.10 to 1.10), stress scores (β, 0.50; 95% CI, 0.45 to 0.56), and anxiety scores (β, 0.41; 95% CI, 0.36 to 0.47), while working experience was associated with reduced depression scores (β, -0.08; 95% CI, -0.16 to -0.01). Factors associated with increased stress scores included working experience (β, 0.08; 95% CI, 0.00 to 0.16), personal protective equipment interference with daily activities (β, 0.55; 95% CI, 0.07 to 1.00), depression scores (β, 0.54; 95% CI, 0.48 to 0.59), and anxiety scores (β, 0.45; 95% CI, 0.39 to 0.50), while age was associated with reduced stress scores (β, -0.12; 95% CI, -0.20 to -0.05).Conclusions: Specific interventions are necessary to enhance and promote the mental health of HCWs so they can successfully cope with the circumstances of the pandemic.
고창현,( Phan Tuan Ngoc ) 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The hydrogenation of model lignin compound (anisole) was performed over Ru catalysts using a batch reactor at 10 bar H2 pressure and 200 °C. Various mesoporous transition metal oxides including TiO2, Fe3O4, and Co3O4 were prepared by hydrothermal synthesis methods and then used as the support of Ru catalysts. The textural properties of the catalysts were characterized by X-ray diffraction, N2 adsorption-desorption, and CO chemisorption. Ru particle sizes, conversion of anisole, and yield of benzene changed drastically depending on the kind of support indicating the significant influence of the active metallic species-mesoporous support interaction. Among three catalysts, the Ru/meso-TiO2 catalyst showed strongest interation between Ru particle and support resulted in highest anisole conversion and largest amount of benzene produced. Results demonstrate that mesoporous TiO2 support enhanced catalytic activity and directed the reaction pathway toward direct deoxygenation.
Nguyen, Tuan Lam,Pham, Thi Quynh Nga,Hoang, Van Minh,Kim, Bao Giang,Phan, Thi Hai,Doan, Thu Huyen,Nguyen, Thuy Linh,Duong, Khanh Van,Luong, Ngoc Khue Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.no.sup1
Second-hand tobacco smoke (SHS) exposure at home, especially among children, is a serious issue in Viet Nam. During the past decade, much effort has been taken for tobacco control in the country, including various prgorammes aiming to reduce SHS exposure among adults and children. This article analysed trends and factors associated with SHS exposure at home among school children aged 13-15 in Viet Nam, using the Global Youth Tobacco Surveys conducted in 2007 and 2014. Descriptive and inferential statistical methods with logistic regression were applied. Overall, there was a significant reduction in the level of exposure, from 58.5% (95%CI: 57.6-59.3) in 2007 to 47.1% (95%CI: 45.4-48.8) in 2014. Of the associated factors, having one or both parents smoking was significantly associated with the highest odds of SHS exposure at home (OR=5.0; 95%CI: 4.2-6.1). Conversely, having a mother with a college or higher education level was found to be a protective factor (OR=0.5; 95%CI: 0.3-0.8).
중형기공을 지닌 티타늄산화물 제조 및 수첨탈산소반응용 촉매지지체 적용
고창현,( Phan Tuan Ngoc ) 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
수열합성법을 이용해서 중형기공을 지닌 티타늄산화물을 합성하였으며 질소 흡/탈착 등온선, X선 회절분석, 투과전자현미경을 이용해서 합성된 시료의 물리적 특성을 확인하였다. 다양한 합성조건과 소성온도를 조절해서 생성된 티타늄산화물의 중형기공 크기를 조절하였다. 소성온도가 600도 이상으로 높아지면 anatase상에서 rutile 상으로 전이가 일어나면서 중형기공이 사라진다. 따라서 중형기공을 활용하려면 지지체의 소성온도는 500도 이하를 유지해야 한다. 중형기공을 지닌 티타늄산화물을 지지체로 사용하고 루테늄을 담지해서 수첨탈산소반응에 촉매로 사용하였다. 루테늄이 중형기공을 지닌 실리카인 SBA-15에 담지된 촉매에 비해서 담지된 루테늄의 입자크기가 작았으며 촉매활성도 높았다.
Trieu Ngan Hoang Kim,Phan Xuan Thi,Tran Linh Thanh,Pham Huy Minh,Huynh Dai Quang,Nguyen Tuan Manh,Mai Anh Tuan,Du Quan Quoc Minh,Nguyen Bach Xuan,Pham Thao Thi Ngoc 대한중환자의학회 2023 Acute and Critical Care Vol.38 No.3
Background: Hemostatic dysfunction during extracorporeal membrane oxygenation (ECMO) due to blood-circuit interaction and the consequences of shear stress imposed by flow rates lead to rapid coagulation cascade and thrombus formation in the ECMO system and blood vessels. We aimed to identify the incidence and risk factors for cannula-associated arterial thrombosis (CaAT) post-decannulation. Methods: A retrospective study of patients undergoing arterial cannula removal following ECMO was performed. We evaluated the incidence of CaAT and compared the characteristics, ECMO machine parameters, cannula sizes, number of blood products transfused during ECMO, and daily hemostasis parameters in patients with and without CaAT. Multivariate analysis identified the risk factors for CaAT. Results: Forty-seven patients requiring venoarterial ECMO (VA-ECMO) or hybrid methods were recruited for thrombosis screening. The median Sequential Organ Failure Assessment score was 11 (interquartile range, 8–13). CaAT occurred in 29 patients (61.7%), with thrombosis in the superficial femoral artery accounting for 51.7% of cases. The rate of limb ischemia complications in the CaAT group was 17.2%. Multivariate analysis determined that the ECMO flow rate–body surface area (BSA) ratio (100 ml/min/m2) was an independent factor for CaAT, with an odds ratio of 0.79 (95% confidence interval, 0.66–0.95, P=0.014). Conclusions: We found that the incidence of CaAT was 61.7% following successful decannulation from VA-ECMO or hybrid modes, and the ECMO flow rate–BSA ratio was an independent risk factor for CaAT. We suggest screening for arterial thrombosis following VA-ECMO, and further research is needed to determine the risks and benefits of such screening.