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- 저자 : Shimeng Yu (검색결과 4 건)
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Shimeng Yu,Danting Li,Yan Zhang,Hui Wang,Junjie Quan,Enze Xu,YANG JIANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.6
Prussian blue analogs are receiving intense attention due to their high theoretical energy density and low cost, but their real applications are still hampered by poor electronic conductivity and cycling stability. Here, Na1.83Ni0.12Mn0.88Fe(CN)6 wrapped with graphene was synthesized by a facile co-precipitation method. The existence of RGO not only significantly increases the conductivity of the cathode, but also makes the framework much more robust during long cycling process. As the cathode, the Na1.83Ni0.12Mn0.88Fe(CN)6/RGO is able to deliver a high initial discharge capacity of 120mAh g-1 at a current density of 20mA g-1 with superior capacity retention of 96.7% after 100 cycles. Even at a current density of 1000mA g-1, the cell still delivers a capacity of 86mAh g-1, indicating outstanding rate capability. The results and the facile synthesis method enable Na1.83Ni0.12Mn0.88Fe(CN)6/RGO to the competitive for a future energy storage system.
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Qiao Shimeng,Yu Helong,Heidari Ali Asghar,El-Saleh Ayman A,Cai Zhennao,Xu Xingmei,Mafarja Majdi,Chen Huiling 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.5
The whale optimizer is a popular metaheuristic algorithm, which has the problems of weak global exploration, easy falling into local optimum, and low optimization accuracy when searching for the optimal solution. To solve these problems, this paper proposes an enhanced whale optimization algorithm (WOA) based on the worst individual disturbance (WD) and neighborhood mutation search (NM), named WDNMWOA, which employed WD to enhance the ability to jump out of local optimum and global exploration, adopted NM to enhance the possibility of individuals approaching the optimal solution. The superiority of WDNMWOA is demonstrated by representative IEEE CEC2014, CEC2017, CEC2019, and CEC2020 benchmark functions and four engineering examples. The experimental results show that thes WDNMWOA has better convergence accuracy and strong optimization ability than the original WOA.
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Han Hui,Liu Yu,Yang Shimeng,Xue Haozhe,Zhang Dayu,Xie Yongjian 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.2
A comprehensive understanding of the interaction between pesticides and climate change is critical to the safety of pesticide applications. Many insecticides are actually more toxic at higher temperatures. However, little is currently known about the effect of temperature on the toxicity of chemicals. In order to fill this knowledge gap and improve our understanding of the mechanisms of temperature effects, the present study investigated the toxic, physiological, and behavioral effects of four insecticides, chlorfenapyr, fipronil, imidacloprid, and indoxacarb, on subterranean termites, Reticulitermes flaviceps at different temperatures (24 to 32 ◦ C). The results show that the sensitivity of R. flaviceps to chrofenapyr (LC 50 = 8.67–152.49 mg/L), fipronil (LC 50 = 10.14–36.84 mg/L), imidacloprid (LC 50 = 184.27–326.47 mg/L) and indoxacarb (LC 50 = 12.23–46.23 mg/L) substantially increased when the temperature alters from 24 to 32 ◦ C. Additionally, the activities of three detoxification en zymes [glutathione S-transferases (GSTs), carboxylesterase (CarE), and cytochrome P450 (P450)] of R. flaviceps were also measured of four insecticide at various temperatures. Correlation analysis reveals that changes in GSTs CarE and P450 activities of R. flaviceps are closely related to their sensitivity to chlorfenapyr, fipronil, imida cloprid, and indoxacarb. Meanwhile, the speed of action (LT 50 value) of four insecticides is positively affected by temperature. In addition, intoxication, ataxia, and moribundity behaviors were observed in most concentrations and temperature combinations for chlorfenapyr, fipronil, and imidacloprid–exposed termite. The findings of our research emphasize that in the context of global climate change, the development and application of pesticides should consider the temperature dimension.
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Nanoscale Bipolar and Complementary Resistive Switching Memory Based on Amorphous Carbon
Yang Chai,Yi Wu,Takei, Kuniharu,Hong-Yu Chen,Shimeng Yu,Chan, Philip C. H.,Javey, Ali,Wong, H.-S Philip IEEE 2011 IEEE transactions on electron devices Vol.58 No.11
<P>There has been a strong demand for developing an ultradense and low-power nonvolatile memory technology. In this paper, we present a carbon-based resistive random access memory device with a carbon nanotube (CNT) electrode. An amorphous carbon layer is sandwiched between the fast-diffusing top metal electrode and the bottom CNT electrode, exhibiting a bipolar switching behavior. The use of the CNT electrode can substantially reduce the size of the active device area. We also demonstrate a carbon-based complementary resistive switch (CRS) consisting of two back-to-back connected memory cells, providing a route to reduce the sneak current in the cross-point memory. The bit information of the CRS cell is stored in a high-resistance state, thus reducing the power consumption of the CRS memory cell. This paper provides valuable early data on the effect of electrode size scaling down to nanometer size.</P>
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