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Hoang Thien Khoi Nguyen,Trang An Duong,에르키노프 파루크,강형원,Byeong-Woo Kim,안창원,한형수,JAE SHIN LEE 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.5
This study investigated the structures, dielectric, ferroelectric and piezoeletric properties of lead-free (0.99 x ) Bi 0.5 Na 0.5 TiO 3 0.01CaTiO 3 x SrTiO 3 (BNT CT 100 x ST, x = 0.22–0.30) piezoelectric ceramics. These piezoceramics were successfully prepared using the conventional solid-state reaction method sintered at 1175 °C for 2 h. It was found that a phase transition from nonergodic relaxor to ergodic relaxor was induced by ST modifi cation in BNT CT ceramics. Consequently, a large electromechanical strain of 0.20% corresponding to high normalized strain d∗ 33 of 667 pm/V was obtained even under 3 kV/mm for BNT CT 28ST ceramics. Therefore, it is noted that lead-free BNT CT 100 x ST ceramics can be promising candidates for actuator applications.
Acute Myocardial Infarction in Patients With Single Coronary Artery: A Case Report
Nguyen Thi Huyen,Nguyen Ngoc Trang,Nguyen Khoi Viet,Le Thi Thuy Lien,Hoang Thi Van Hoa,Phung Bao Ngoc,Vu Dang Luu 아시아심장혈관영상의학회 2022 Cardiovascular Imaging Asia Vol.6 No.2
A single coronary artery (SCA) is a rare congenital anomaly. In most cases, it is an incidental finding on coronary angiography and has no clinical significance. However, it can cause angina, myocardial infarction, or even sudden death. Reports of SCA with acute myocardial infarction are very rare in the medical literature. This case study presents a patient with SCA from the right aortic sinus with severe stenosis in the proximal and distal part of the right coronary artery, which was detected using cardiac angiography and cardiac multidetector computed tomography (MDCT) with acute myocardial infarction.
Raman spectroscopy of Cu doping in Zn<sub>1−x</sub>Co<sub>x</sub>O diluted magnetic semiconductor
Hoang, Luc Huy,Hien, Nguyen Thi Minh,Hai, Nguyen Hoang,Hai, Pham Van,Khoi, Nguyen The,Yang, In-Sang John Wiley Sons, Ltd. 2009 JOURNAL OF RAMAN SPECTROSCOPY - Vol.40 No.11
<P>The room-temperature ferromagnetism and the Raman spectroscopy of the Cu-doped Zn<SUB>1−x</SUB>Co<SUB>x</SUB>O powders prepared by the sol–gel method are reported. The x-ray diffraction (XRD) data confirmed that the wurtzite structure of ZnO is maintained for ZnO doped with Co below 10 at%. The magnetization–field curves measured at room temperature demonstrated that all Co-doped ZnO powders were paramagnetic. Ferromagnetic ordering is observed for the samples doped with Cu in Zn<SUB>0.98</SUB>Co<SUB>0.02</SUB>O and strongly depends on the concentration of Cu. The relative strength of the second-order LO peak to the first-order one in the Raman spectra, which is related to the carrier concentration, of the Cu-doped Zn<SUB>0.98</SUB>Co<SUB>0.02</SUB>O powder is strongly correlated with the saturation magnetic moment of the system. This seems to be in favor of the Ruderman-Kittel-Kasuya-Yosida (RKKY) or double exchange mechanism of the ferromagnetism in this system. Copyright © 2009 John Wiley & Sons, Ltd.</P> <B>Graphic Abstract</B> <P>The room-temperature ferromagnetism and the Raman spectroscopy data of Cu-doped Zn<SUB>1−x</SUB>Co<SUB>x</SUB>O powders prepared by the sol–gel method are reported. The relative strength of the second-order LO peak to the first-order one in the Raman spectra, which is related to the carrier concentration, of Cu-doped Zn<SUB>0.98</SUB>Co<SUB>0.02</SUB>O powder is strongly correlated with the saturation magnetic moment of the system. <img src='wiley_img/03770486-2009-40-11-JRS2295-gra001.gif' alt='wiley_img/03770486-2009-40-11-JRS2295-gra001'> </P>
Magneto-Optical Properties of ZnO:Co Nanocrystalline Films
Luc Huy Hoang,Nguyen The Khoi,Nguyen Hoang Hai,W. Pacuski,양인상 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Co doped ZnO lms were synthesized from the precursors Zn(CH3COO)2.2H2O and Co(CH3COO)2.4H2O by using a \High Voltage Spray Pyrolysis" technique. The physical prop- erties of the prepared lms were characterized by using scanning electron microscopy (SEM), X-ray diraction (XRD) and physical property mesurement system (PPMS) measurements. The lms studied were of a wurtzite phase with grain sizes of about 20 nm. The 5 % Co-doped ZnO lms exhibited ferromagnetic behavior at room temperature. The transmission and the optical magnetic circular dichroism (MCD) measurements conrmed that Co2+ was located at the tetrahedral sites of the ZnO wurtzite structure. MCD results showed that the observed ferromagnetism was less likely related to a carrier-induced mechanism.
Ngoc Nhon Hoang,Tri Khoi Nguyen,Tuyet Hoa Vo,Ngoc Hoi Nguyen,Dai Hai Nguyen,Dieu Linh Tran 한국고분자학회 2022 Macromolecular Research Vol.30 No.2
Fucoidan, a natural sulfated polysaccharide extracted from seaweed, has been widely used in pharmaceutical field due to its excellent biological activities including antiviral, anticancer, antioxidant, anticoagulant, etc. Therefore, investigating the new natural sources of fucoidan has been received growing attention recently. This study reported for the first time the isolation, purification, characterization, and biological activities of fucoidan from Ceratophyllum submersum (FCS). The molecular weight of obtained FCS was 9.7 kDa, composed of fucose (42.11%) and sulfate (16.38%). The FCS contained (1→3)-α-L-Fucopyranose and β-D-galactose bond in the structure. In addition, FCS showed strong antioxidant properties against 2,2-diphenyl-1-picrylhydrazyl, 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonic acid), and reactive oxygen species radicals with inhibitory concentration 50 values were 765.48 ppm, 845.31 ppm, and 1760.00 ppm, respectively. The FCS also performed good antibacterial, antifungal, anticoagulant and anti-inflammatory activityies. Especially, it expressed a better inhibition activity on breast cancer cell line (MCF-7) than that on liver cancer cells (HepG2), lung cancer cells (NCI-H460), and cervical cancer cells (HeLa). FCS demonstrated potential utility in functional food, cosmeceutical, and pharmaceutical industries. In the trend of discovering new sources for fucoidan with outstanding bioactivities, this report would contribute a basic platform and valuable information for further studies on fucoidan from C. Submersum.
Phung Bao Ngoc,Nguyen Khoi Viet,Hoang Van Hoa,Nguyen Ngoc Trang,Le Thi Thuy Lien,Pham Minh Thong,Vu Dang Luu 아시아심장혈관영상의학회 2022 Cardiovascular Imaging Asia Vol.6 No.2
Left pulmonary artery sling (LPAS) is a rare congenital anomaly in which the left pulmonary artery (LPA) originates from the posterior aspect of the right pulmonary artery and courses between the trachea and esophagus to reach the left lung. This anomaly causes distal tracheal and/or right main stem bronchus compression. Most LPAS cases are associated with early symptom onset, around 2 month-old, and have severe respiratory distress within the first year of life. There are two major types of LPAS based on the location of LPA and abnormal bronchial branching. The diagnosis can be made by using various imaging modalities. Herein, we present the imaging characteristics on multidetector computed tomography of 5 LPAS cases with respiratory distress (2 months to 12 months).
Le Thi Thuy Lien,Nguyen Khoi Viet,Hoang Van Hoa,Phung Bao Ngoc,Nguyen Ngoc Trang,Vu Thi Kim Thoa,Nguyen Cong Tien,Phan Anh Phuong,Pham Minh Thong,Vu Dang Luu 아시아심장혈관영상의학회 2022 Cardiovascular Imaging Asia Vol.6 No.2
Objective: To compare left ventricular (LV) function, ejection fraction (EF), end-diastolic volume (EDV), end-systolic volume (ESV), and regional wall motion analyzed in 256-slice dualsource coronary CT angiography (DSCT) with 2D transthoracic echocardiography (TTE). Materials and Methods: One hundred twelve patients suspected of coronary artery disease underwent DSCT and 2D-TTE within one week for LVEF, EDV, and ESV. The correlation between DSCT and 2D-TTE measurements was analyzed through linear regression and Bland- Altman analysis. Regional wall motion was visually scored with a 3-point scale (1, normal; 2, hypokinesia; 3, dysphagia, akinesia). Results: Average LVEF at 66.45%±1.27% (range 23%–85%) as determined on DSCT compared with 66.09%±1.01% (range 25%–84%) on 2D-TTE. LVEF exhibited a good correlation between DSCT and 2D-TTE (r=0.715; p<0.001). Good correlations between DSCT and 2D-TTE were demonstrated for LVEDV (r=0.732; p<0.001) and LVESV (r=0.841; p<0.001). Mean differences (±SD) of 1.78±24.10 mL (p<0.05) and 0.77±13.70 mL (p<0.05) were observed between DSCT and 2D-TTE for LVEDV and LVESV, respectively. LVEF was slightly overestimated with DSCT (0.52%±9.59%; p<0.05). Although the LVEF values calculated by DSCT and 2D-TTE were similar, EDV and ESV from DSCT were statistically higher than those from 2D-TTE (p<0.05). Agreement between DSCT and 2D-TTE in regional wall motion was 96.4%, κ=0.840. Conclusion: DSCT can provide comparable results to those using 2D-TTE for LV function (EF, EDV, and ESV) and regional wall motion assessment in a heterogeneous population.
마이크로파 소성법으로 제조한 BNT-ST 세라믹스의 유전 및 압전 특성
이상훈,김성현,에르키노프 파루크,Hoang Thien Khoi Nguyen,Trang An Duong,한형수,이재신 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.1
This study investigated the microstructure and piezoelectric properties of lead-free 0.74(Bi1/2Na1/2)TiO3-0.26SrTiO3 (BNST26) piezoelectric ceramics sintered using a microwave furnace. For comparison, specimens were also prepared using a conventional furnace sintering (CFS). Average grain sizes of 2.4 μm and 3.2 μm were obtained in the sample sintered at 1,100℃ for 5 min using microwave sintering (MWS) and at 1,175℃ for 2 h using CFS, respectively. To quantify the changes in the microstructures and electrical properties according to the sintering conditions, the polarization hysteresis, bipolar and unipolar strain curves, and temperature dependence of permittivity were evaluated. As a result, it was determined that the Pmax (maximum polarization), Pr (remanent polarization) and Smax (maximum strain) values tend to increase with the average grain size. Based on these results, it is concluded that the MWS method can produce lead-free ceramics with superior performance in a relatively short time compared to the conventional CFS method. 본 연구에서는 마이크로파 소성법으로 제조한 0.74(Bi1/2Na1/2)TiO3-0.26SrTiO3 (BNST26) 무연 압전 세라믹스의 유전 및 압전 특성을 살펴보았다. BNST26 시료의 경우 일반 전기로 소성법의 경우 1175°C에서 2시간 동안 소결하면 충분한 치밀화가 진행되었으며 평균입도는 3.2 μm이었다. 반면에 마이크로파 소성법으로 제조한 경우 1100°C에서 5분간 소성하여도 충분히 치밀화가 진행되었으며 평균입도는 보다 작은 2.4 μm으로 나타났다. 특히 전계유기 변형 특성면에서 CFS 방법으로 제조한 시료의 경우 4 kV/mm의 전계 하에서 정규화 변형률이 509.5 pm/V를 나타내었고, MWS 방법으로 1100°C에서 5분간 소결하여 제조한 시료는 491.7 pm/V를 나타내어 대등한 수준의 특성을 보였다.
( Trang An Duong ),( Hoang Thien Khoi Nguyen ),( Sang-sub Lee ),( Chang Won Ahn ),( Byeong Woo Kim ),( Jae Shin Lee ),( Hyoung Su Han ) 한국센서학회 2021 센서학회지 Vol.30 No.6
This study analyzes the phase transition behavior and electrical properties of lead-free (1-x)K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3-x</sub>BaZrO<sub>3</sub> (KNN-100xBZ) piezoelectric ceramics. The stabilized crystal structures in BaZrO<sub>3</sub>-modified KNN ceramics is clarified to be pseudocubic. The polymorphic phase transition from the orthorhombic to pseudocubic phases can be observed with KNN-6BZ ceramics considering the optimized piezoelectric constant (d<sub>33</sub>). Electromechanical strain behaviors are discussed. Accordingly, the enhancement of strain value at x = 0.08 (composition) may originate from the coexistence of ferroelectric domains and polar nanoregions. A schematic of domains for KNN, KNN-8BZ, and KNN-15BZ ceramics has been proposed to describe the relationship between the stabilized relaxor and changes in electrical properties.
Thuong, Phuong Thien,Hung, Tran Manh,Khoi, Nguyen Minh,Nhung, Hoang Thi My,Chinh, Nguyen Thi,Quy, Nguyen Thi,Jang, Tae Su,Na, MinKyun 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.3
Four lignans, meso-dihydroguaiaretic acid (DHGA), macelignan, fragransin $A_2$ and nectandrin B, were isolated from the seeds of Myristica fragrans (Vietnamese nutmeg) and investigated for their cytotoxic activity against eight cancer cell lines. Of these, DHGA exhibited potent cytotoxicity against H358 with $IC_{50}$ value of $10.1{\mu}M$. In addition, DHGA showed antitumor activity in allogeneic tumor-bearing mice model.