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Fabrication and Control of Rectilinear Artificial Muscle Actuator
Nguyen Huu Chuc,Nguyen Huu Lam Vuong,Duk Sang Kim,Hyung Pil Moon,Ja Choon Koo,Young Kwan Lee,Jae-Do Nam,Hyouk Ryeol Choi IEEE 2011 IEEE/ASME transactions on mechatronics Vol.16 No.1
<P>In this paper, we present an artificial muscle actuator based on a dielectric elastomer called the “multistacked actuator.” The actuator is made from a new material, the synthetic elastomer, developed by the authors. The proposed actuator is configured with multiple stacked synthetic elastomer films coated with compliant electrodes on both sides. This design enables the actuator to generate rectilinear motion with high force density. In addition, the actuators can be fabricated in various geometries to meet the requirements of the applications. We develop a pulsewidth-modulated proportional-integral-derivative (PWM-PID) feedback controller based on the high-voltage switching circuit and implemented it to drive the proposed actuator. Finally, the performance of the actuator is evaluated via experiments.</P>
Ha Huu Do,Ha Huu Do,Wenwu Guo,Mahider Tekalne,Quyet Van Le,Thang Phan Nguyen,Jin Hyuk Cho,Sang Hyun Ahn,Soo Young Kim 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.1
Reversible metal electrodeposition (RME) windows are a promising material for electrochromic windows and electronic display applications. However, the lifetime of RME devices is a major drawback in the preparation of commercial and practical devices. In this study, we propose a new strategy to prolong the stability and improve the efficiency of RME devices. By using tungsten oxide, a well-known electrochromic material, to modify the surface of a transparent conductive electrode, superior, stable, and highly effective devices were prepared successfully. By applying a low potential of − 0.8 V to 0.5 V, the RME device can quickly switch between a bleached state and colored state with different colors changing from transparent to black and deep blue. The performance improvement of the RME device can be explained by the simultaneous reduction of tungsten oxide and metal ion deposition in the conductive substrate under an applied potential. Furthermore, the lifetime of the device increased significantly (over 1500 cycles) owing to the shielding role of tungsten oxide film in the acid medium, which is an indispensable component of reversible electrochromic devices.
Do Huu Nghi,Rene´ Ullrich,Franco Moritz,Le Mai Huong,Vu Dinh Giap,Do Huu Chi,Martin Hofrichter,Christiane Liers 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.3
Three ascomycetous soft-rot fungi belonging to the family Xylariaceae were found to produce high levels of a p-nitrophenyl acetate-hydrolyzing activity during growth on lignocellulosic materials, i.e., wheat straw and beech wood chips. Accordingly, Kretzschmaria deusta, Morchella elata, Xylaria polymorpha were seemingly most noteworthy acetyl esterase producers and, of which, X. polymorpha (strain A35) was chosen for further studies. Induction study indicated that raw carbohydrate sources, such as beech wood, rape straw, birch wood, and wheat straw, were extremely important for acetyl esterase production. Acetyl esterase of X. polymorpha was produced in solid-state culture on wheat straw and purified by different steps of anion-exchange and size-exclusion chromatography. This purified enzyme (MW = 44 kDa and pI values of 3.5–3.6) exhibited the capability to solubilise in vitro beech wood to release water-soluble lignin fragments with molecular masses of 1–3 kDa as analyzed by high performance size exclusion chromatography.
Nghi, Do Huu,Ullrich, Rene,Moritz, Franco,Huong, Le Mai,Giap, Vu Dinh,Chi, Do Huu,Hofrichter, Martin,Liers, Christiane 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.3
Three ascomycetous soft-rot fungi belonging to the family Xylariaceae were found to produce high levels of a p-nitrophenyl acetate-hydrolyzing activity during growth on lignocellulosic materials, i.e., wheat straw and beech wood chips. Accordingly, Kretzschmaria deusta, Morchella elata, Xylaria polymorpha were seemingly most noteworthy acetyl esterase producers and, of which, X. polymorpha (strain A35) was chosen for further studies. Induction study indicated that raw carbohydrate sources, such as beech wood, rape straw, birch wood, and wheat straw, were extremely important for acetyl esterase production. Acetyl esterase of X. polymorpha was produced in solid-state culture on wheat straw and purified by different steps of anion-exchange and size-exclusion chromatography. This purified enzyme ($M_W=44kDa$ and pI values of 3.5-3.6) exhibited the capability to solubilise in vitro beech wood to release water-soluble lignin fragments with molecular masses of 1-3 kDa as analyzed by high performance size exclusion chromatography.
Tai, Bui Huu,Jung, Bong Yong,Cuong, Nguyen Manh,Linh, Pham Thuy,Tung, Nguyen Huu,Nhiem, Nguyen Xuan,Huong, Tran Thu,Anh, Ngo Thi,Kim, Jeong Ah,Kim, Sang Kyum,Kim, Young Ho Pharmaceutical Society of Japan 2009 Biological & pharmaceutical bulletin Vol.32 No.12
<P>Nine compounds, including six phenylethanoid glycosides: acteoside (1); bioside (2); echinacoside (3); poliumoside (4); phenylethyl glycoside (5); salidroside (6) and three flavonoids; linarin (7); apigenin (8); isorhoifolin (9), were isolated from the flowers of <I>Buddleja officinalis</I> M<SMALL>AXIM</SMALL>. (Buddlejaceae). Chemical structures were confirmed by <SUP>1</SUP>H-, and <SUP>13</SUP>C-NMR, and MS spectral methods and compared with those reported in the literature. Antioxidant activities of the methanol and water extracts, and all isolated compounds were evaluated using the total oxidant scavenging capacity (TOSC) assay against peroxynitrite. Results of the assay showed that the phenylethanoid glycosides, a major class of compounds of the flowers of <I>B. officinalis</I>, possess strong antioxidant activity. Of these, acteoside, echinacoside and poliumoside have 9.9-, 9.8- and 9.5-fold TOSC value, respectively, compared with the positive control, Trolox.</P>
In vivo Trafficking of Liposomes Containing Boron Compounds for Boron Neutron Capture Therapy (BNCT)
Huu Bao Nguyen,유정수 대한방사성의약품학회 2023 Journal of radiopharmaceuticals and molecular prob Vol.9 No.1
For over 50 years, boron neutron capture therapy (BNCT) has been steadily developed for treating various cancers. This is a non-invasive, selective, and targeted radiotherapy wherein boron-rich molecules accumulate at the tumor site. Liposomal vesicles have become a popular and effective drug delivery system for BNCT, with strategies including surface decoration, bilayer integration, and hydrophilic core encapsulation. This review highlights the state-of-the-art uses of liposomes in BNCT and elucidates a new perspective where BNCT can be used with radiotracer guidance in all-in-one delivery systems