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Observing the localization of light in space and time by ultrafast second-harmonic microscopy
Mascheck, Manfred,Schmidt, Slawa,Silies, Martin,Yatsui, Takashi,Kitamura, Kokoro,Ohtsu, Motoichi,Leipold, David,Runge, Erich,Lienau, Christoph Springer Science and Business Media LLC 2012 Nature photonics Vol.6 No.5
Yi, Jue-Min,Smirnov, Vladimir,Piao, Xianji,Hong, Jiho,Kollmann, Heiko,Silies, Martin,Wang, Wei,Groß, Petra,Vogelgesang, Ralf,Park, Namkyoo,Lienau, Christoph American Chemical Society 2016 ACS NANO Vol.10 No.1
<P>We report a drastic increase of the damping time of plasmonic eigenmodes in resonant bull's eye (BE) nanoresonators to more than 35 fs. This is achieved by tailoring the groove depth of the resonator and by coupling the confined plasmonic field in the aperture to an extended resonator mode such that spatial coherence is preserved over distances of more than 10 mu m. Experimentally, this is demonstrated by probing the plasmon dynamics at the field level using broadband spectral interferometry. The nanoresonator allows us to efficiently concentrate the incident field inside the central aperture of the BE and to tailor its local optical nonlinearity by varying the aperture geometry. By replacing the central circular hole with an annular ring structure, we obtain 50-times higher second harmonic generation efficiency, allowing us to demonstrate the efficient concentration of long-lived plasmonic modes inside nanoapertures by interferometric frequency-resolved autocorrelation. Such a light concentration in a nanoresonator with high quality factor has high potential for sensing and coherent control of light-matter interactions on the nanoscale.</P>
Research on a New Class of Planar Tensegrity Trusses Consisting of Repetitive Units
Sili Li,Xian Xu,Jiaqi Tu,Yafeng Wang,Yao-Zhi Luo 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.5
Tensegrity structure is a prestressed self-equilibrated system consisting of compressed struts and tensioned cables. Planar truss is one of the most common forms of engineering structures with a wide application. This paper proposes a new class of planar tensegrity trusses whose prototype is unintentionally found by a topology optimization algorithm. The prototype truss is composed of two basic units which are combined alternately. In this paper, the state of prestress of the truss is analytically determined from the equilibrium conditions. The stiff ness and strength of the structure are analytically formulated by using the principle of virtual work. Parametric analysis of geometrical parameters on the stiff ness and strength of the structure is carried out. By changing the shape of the basic units, the uniform planar tensegrity truss is extended to a fi sh-bellied truss. Parametric analysis is also carried out for the fi sh-bellied truss. An example of extending the planar tensegrity truss into a three-dimensional latticed tensegrity truss is also given.
Zhao Xilin,Gong Sili,Fu Bo,Gong Chufeng 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
To solve the LFC issues of the HVDC multi-area grids caused by the participation of the wind power, a novel control strategy is proposed in this paper. Firstly, considering that the wind turbines participate in the primary frequency regulation, the LFC model of the multi-area interconnected grids with HVDC tie-line is constructed. Due to the uncertainty of wind speed, the parameters of the LFC system are dynamic. Then, a control structure with the cascade of the time-varying MPC and PID controller is designed. The PID is connected in series behind to adjust the output of the time-varying MPC so as to improve its control performance. Furthermore, a dynamic hierarchical control method is proposed, of which time-varying MPC activates or not depends on the control requirements. It applies only the PID controller when frequency changes little but the cascade structure with PID and time-varying MPC when that changes much. Because the LFC system of each area is an independent subsystem among which the information can transfer, a MAS is put forward during the design. Finally, a three-area interconnected power system is analyzed to testify the feasibility of the proposed method. The simulation results show that the proposed control method can reduce the time complexity of system control algorithm by adjusting the participation of the upper time-varying MPC controller, which is under the premise of ensuring the control effect.
Lee, Jong Hwa,Choi, Eun Sili,Oh, Kyu Seon,Lee, Dong Wook,Chang, Jeong Hyun,Um, Kyung Il The Korean Society for Integrative Biology 2000 Korean journal of biological sciences Vol.4 No.3
The present investigation was performed to elucidate the effect of pretreatment with low dose ultraviolet radiation (UV) and ethyl methanesulfonate (EMS) on cell survival by trypan blue dye exclusion method and plasma membrane glycoconjugates by lectin-cytochemistry in sarcoma 180 (S180) cells. Pretreatment with 2 J/$m^2$ UV or 2 mM EMS increased the percentage of survival of cells subsequently treated with high dose UV (10 or 20 J/$m^2$) or EMS (10 or 20 mM), respectively. Staining intensity of concanavalin A (Con A) of the cells pretreated with 2J/$m^2$ UV or 2 mM EMS and subsequently treated with 10 or 20 mM EMS was stronger than that of the cellstreated with 10 or 20 mM EMS. These results suggest that there is an adaptive response on cell survival to EMS or UV in S180 cells. And the results show a change in mannose-containing glycoconjugates of plasma membrane in S180 cells pretreated with EMS or UV and subsequently treated with EMS.
Gao Shihao,Wang Qunjing,Li Guoli,Qian Zhe,Zhou Sili,Li Zheng 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6
This paper proposes a defl ectable switched reluctance motor/generator, which can be used in wave energy conversion and underwater propulsion systems. When an underwater vehicle stops working, the ocean current drives the turbine blades connected to the motor to rotate, and the rotating turbine blades drive the defl ectable generator shaft to generate electricity. The defl ectable motor can complete multi-degree-of-freedom motion, so it can receive ocean current energy in multiple directions, thereby improving energy extraction effi ciency. When the underwater vehicle starts to work, the defl ectable motor can freely adjust the course of the vehicle, so that the vehicle can yaw freely under water. The fi nite element method is used to analyze the air gap fl ux density during rotation and defl ection. The relationship between the fl ux, torque and current of a single coil under diff erent rotor positions is obtained, and then the output current and voltage of the defl ectable generator are obtained. Finally, a prototype was made for experimental verifi cation.