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Nguyen Van Quyet,Luong Huu Bac,Dang Duc Dung 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.8
In this work, a strong enhancement of the electric-field-induced strain in Bi0.5(Na,K)0.5TiO3- based ceramics was observed via lithium(Li) addition. The Li-added Bi0.5(Na,K)0.5TiO3-based ceramics exhibited a strain of 0.40% under an electric field of 6 kV/mm, which was almost twice the value without the Li dopant (0.21%). We obtained the highest Smax/Emax value of 668 pm/V for 4-mol% Li addition, which was due to the phase transition from pseudocubic to rhombohedral symmetry and/or to the distorted tetragonal structure. We suggest that controlling the phase transition in ferroelectric materials is a way to enhance the electric-field-induced giant strain and that the phase transition from the non-polar phase to the polar phase results in a giant electric-fieldinduced strain, which overcomes the result due to the phase transition from the polar phase to the non-polar phase and/or the distorted structure. We expect our work to open new ways to enhance the electric-filed-induced giant strain to a value that is comparable to the value for Pb(Zr,Ti)O3 (PZT)-based ceramics.
Stepwise waveform generator for autonomous microfluidic control
Kim, Geunyong,Dang, Bac Van,Kim, Sung-Jin Elsevier 2018 Sensors and actuators. B Chemical Vol.266 No.-
<P><B>Abstract</B></P> <P>Controlling fluidic stepwise waveforms is important in many applications of medical science, biology, and chemistry. However, such a control is implemented by automated, yet expensive, dynamic controllers hindering broad use of these systems. This study presents a stepwise waveform generator (SWG) that achieves stepwise pressure variation using constant water-head pressure only. SWG consists of a microfluidic oscillator and a diode pump, autonomously converts constant pressure to pulsatile pressure via the oscillator, and then generates stepwise increasing or decreasing pressures via the diode pump. The step size, and duration time of the pressure step, can be set independently to take values within the range of 215–431 Pa and 26–181 s, respectively. With the use of additional valves, SWG can regulate flow rate, wall shear stress, and reagent concentration, in a stepwise manner, thereby opening new avenues for the applicability of this self-controlled device.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This device converts constant pressure to stepwise pressure without any dynamic controllers. </LI> <LI> The step size and duration time of the pressure step are generated within the range of 215–431 Pa and 26–181 s, respectively. </LI> <LI> This device enables the stepwise control of chemical concentration and shear stress. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P> <P>This paper presents a device that converts constant pressure to stepwise pressure without any dynamic controllers for the stepwise control of chemical concentration and shear stress.</P>
( Minh Hai Pham ),( Quan Anh Tuan Le ),( Hoang Bac Nguyen ),( Quang Hung Vu ),( Thai Ngoc Huy Tran ),( Hang Dang Khoa N Guyen ),( Thi Ngoc Sang Duong ),( Van Toan Tran ) 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: Laparoscopic pancreaticoduodenectomy (LPD) is considered as a safe and effective procedure in well - selected patients and appropriate surgical technique. Our aim is to evaluate suitability of using protocol for LPD in treatment of periampullary cancer at a single team. Methods: case series Results: Indication for LPD included 37 cases with resectable tumors which were classified basing on NCCN. All witness evaluation risk of complications with PREPARE score, ASA and evaluation risk of postoperative pancreatic fistula (POPF) with FRS classification. There were 2 open conversions because of vein resections, accounting for 5.4%. Standard lymphadenectomy was performed in all of 37 cases. In term of PREPARE score, major complications (Clavien - Dindo >= III) were 17.8%, 0% and 0% (5/28, 0/5 and 0/2 cases) in low risk, intermediate risk and high risk group, respectively. All of cases had ASA I or II. POPF happened 11.1% (1/9), 4.1% (1/24) and 50% (1/2) in low risk, intermediate risk and high risk group, respectively. Frozen section was needed for R0 margin. Retrieved lymph nodes was 8 - 18 with 12 lymph nodes in average. Conclusions: Indication for LPD with resectable tumors is acceptable. ASA I or II is a safe measure to select patient for LPD. FRS classification shows appropriation to evaluate risk of POPF.