http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Silica Nano-particle Anneal Treatment and Its Effect on Chemical Mechanical Polishing
Junning Chen,Shibin Lu,Haibo Wang,Ying Meng,Feifei Wang,Min Fan 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1
Introduction: Chemical mechanical polishing is the only one technology to obtain global planarization, which is widely applied to polish silicon, copper dual damascene structure, high/low K dielectric materials, tungsten plugs, poly-silicon gates and shallow trench isolation structure. SiO2 is widely used as abrasive for its superior properties like stability, suspension property and low viscosity There are lots of studies on silica properties. However, the detailed silica surface, inner characteristic and its effect on polishing performance are still unclear. we must also explore the silica nano-particle tiny structure difference, so we designed an experiment that we anneal the colloid silica and re-dispersed it to analyze the variety of particles properties and its influences on CMP performance. Materials: The water glass was purchased from the market. KOH (90%) and H2SO4 (98%) were purchased commercially from Shanghai Aladdin Bio-Chem technology Co., Ltd. All reagents were of analytical grade and used without further purification. Method: Diluted KOH or H2SO4 were added to 1 wt% annealed silica slurry to adjust pH value to 11.0. The slurry was milled in the polishing process. Arsenic doped 4 inch (100) silicon wafer was used to polish. The structural and morphological evolution of silica nano-particles induced by heat treatment are studied by scanning electron microscopy (SEM), X-Ray diffraction (XRD), Fourier transform infrared spectrum (FTIR), differential thermal (DTA) and thermal gravimetric analysis (TGA), which disclose the external and internal structure.
Fan, Qinghua,Noh, Hyuk-Jun,Wei, Zengxi,Zhang, Jiakui,Lian, Xin,Ma, Jianmin,Jung, Sun-Min,Jeon, In-Yup,Xu, Jiantie,Baek, Jong-Beom Elsevier 2019 Nano energy Vol.62 No.-
<P><B>Abstract</B></P> <P>Although lithium ion batteries (LIBs) hold great promise as a next generation power supply, the poor rate capability of the graphite that is mainly used as the battery anode limits high-performance LIBs. Compared to other reported carbon-based materials, however, its relatively low average working voltage still makes it attractive. Herein, we were able to introduce carbon disulfide (CS<SUB>2</SUB>) at the edges of graphene nanoplatelets (GnPs) with rich –C=S/-C-S bonds <I>via</I> ball-milling graphite in the presence of CS<SUB>2</SUB>. The resultant edge-thionic acid-functionalized GnPs (TAGnPs) exhibited a larger accessible surface area and smaller particle size than pristine graphite. Importantly, the TAGnPs retained a long-range-ordered layered structure similar to pristine graphite. When the TAGnPs were used as anode materials for LIBs, they displayed superior rate capability (<I>e.g.</I>, high average reversible capacities of 228.3, 208.1, 141.0 and 80.6 mAh g<SUP>−1</SUP> at 0.5, 1, 2 and 5 A g<SUP>−1</SUP>, respectively) compared to pristine graphite and the reference edge-hydrogenated GnPs (HGnPs), which mainly have -C-H bonds at their edges. Theoretical calculations also indicated that the presence of –C=S/-C-S bonds at the edges of TAGnPs enabled stronger Li<SUP>+</SUP> adsorption capability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Edge-thioated graphene nanoplatelets (TAGnPs) prepared by ball-milling graphite in the presence of carbon disulfide (CS<SUB>2</SUB>). </LI> <LI> TAGnPs have long-range-ordered structure similar to graphite. </LI> <LI> The TAGnPs have a larger accessible surface area than graphite. </LI> <LI> TAGnPs exhibit superior rate capability (>0.5 A g<SUP>−1</SUP>). </LI> <LI> TAGnPs reveal high average reversible capacities of 228.3, 208.1, 141.0 and 80.6 mAh g<SUP>−1</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Viscosity methods of approximation for a common solution of a finite family of accretive operators
Jun-Min Chen,Li-Juan Zhang,Tie-Gang Fan 영남수학회 2011 East Asian mathematical journal Vol.27 No.1
In this paper, we try to extend the viscosity approximation technique to find a particular common zero of a finite family of accretive mappings in a Banach space which is strictly convex reflexive and has a weakly sequentially continuous duality mapping. The explicit viscosity approximation scheme is proposed and its strong convergence to a solution of a variational inequality is proved.
Characteristics Comparison of PWM and PFM/PWM Dual-mode with LED Drives
Fan Zhang,Min-hye Kang,Hee-Jun Kim 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.4
This paper is aimed at the characteristics comparison of PWM and PFM/PWM dual-mode control methods applied in DC-DC buck converters with LED drives. For the purpose of illustrating the performance of the two methods, a verification platform with integrated PWM single-mode control and PFM/PWM dual-mode control is designed. The operational mode of the platform can be selected by an external current control signal real-timely. Experiment results verify that PFM/PWM dual-mode control is able to significantly improve the light-load efficiency of a DC-DC buck converter with wide load range than PWM mode control.
VISCOSITY METHODS OF APPROXIMATION FOR A COMMON SOLUTION OF A FINITE FAMILY OF ACCRETIVE OPERATORS
Chen, Jun-Min,Zhang, Li-Juan,Fan, Tie-Gang The Youngnam Mathematical Society 2011 East Asian mathematical journal Vol.27 No.1
In this paper, we try to extend the viscosity approximation technique to find a particular common zero of a finite family of accretive mappings in a Banach space which is strictly convex reflexive and has a weakly sequentially continuous duality mapping. The explicit viscosity approximation scheme is proposed and its strong convergence to a solution of a variational inequality is proved.
Chalcone suppresses lignin biosynthesis in illuminated soybean cells
Chen, Wei-Jun,Yun, Min-Soo,Deng, Fan,Yogo, Yasuhiro The Korean Society of Weed Science and The Turfgra 2011 Weed Biology and Management Vol.11 No.1
Lignin and its related metabolites play critical roles in plant growth and development. Thus, lignin biosynthesis has attracted interest as a novel target site of plant growth inhibitors. Chalcone has been shown to not only inhibit lignin biosynthesis in plants, but also to suppress the growth of many annual plant species. In order to know the direct effect of chalcone on plant metabolism, the effects of chalcone on the activities of key enzymes in lignin biosynthesis and on the related metabolites were clarified with a time-course study by using light-induced suspension cultures of soybean cells.The fresh weight and packed cell volume of the soybean cells were inhibited after 8 h of chalcone treatment. The activities of phenylalanine ammonia lyase (EC 4.3.1.24) and 4-coumarate: coenzyme A ligase (4CL; EC 6.2.1.12) were largely inhibited 4 h after the treatment with 0.15 $mmol\;L^{-1}$ chalcone. Unlike these two enzymes, the activity of cinnamyl alcohol dehydrogenase (EC 1.1.1.195) was not inhibited until 16 h after the chalcone treatment. The content of the 4CL substrates and lignin in the soybean cells became relatively lower than the control under the light condition within 4 h and 8 h after the chalcone treatment, respectively. These results suggest that the growth suppression of soybean cells is positively associated with the inhibition of lignin biosynthesis by exogenous chalcone.
Influences of stochastic perturbation of parameters on dynamic behavior of gear system
Jian-Wei Lu,Fan-Ling Zeng,Jia-Yun Xin,En-Min Miao,Meng-Jun Liu 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.7
Gear systems are commonly used in vehicles, and the vibration of the gear system was paid more attention in recent years. In this paper,the dynamic behavior of gear system with stochastic perturbation of system parameters was analyzed. A stochastic nonlinear dynamic model of gear system, with consideration of the stochastic perturbation of system parameters, was established. The influences of stochastic perturbation of system parameters, such as excitation frequency, damping ratio, and backlash, on the dynamic behavior of the system were discussed. It was found that when the perturbation intensity is weak, the topological structure of the system solutions will not change, and there is no transition of the attractors. But if the perturbation intensity increases further, there will be transition between the attractors. In general, for single-DOF gear system, the multi-periodic attractor will jump to the quasi-period-1 attractor. But the quasiperiod-1 attractor will not jump to other attractors. If the perturbation intensity is considerable great, bi-directional transition will occur. Yet, the probability of transition from multi-periodic attractor to quasi-period-1 attractor is greater than the probability of transition from multi-periodic attractor to other attractors. Which provide theoretical basis for effective vibration control of gear system.