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RISS 인기검색어
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- 저자 : Yongqiang Dong (검색결과 5 건)
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Time-resolved photoluminescence study of an aggregation-induced emissive chromophore
이명희,Yongqiang Dong,Ben Zhong Tang,도석 김 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.2
The photophysical properties associated with the aggregation-induced emission of hexaphenylsilole (silole) in an acetone/water mixture were studied by using a uorescence decay lifetime measurements. The uorescence decay lifetime of silole in a pure acetone solution was very short and was barely resolved from the instrumental response function (150 ps) of the time-correlated single photon counting system. When water as a poor solvent was added to the silole solution, the photoluminescence (PL) intensity was signicantly enhanced above 60 % of the water fraction compared to the pure acetone solution, and the PL decay lifetime increased up to a value of 4 ns. These results conrmed the formation of silole nanoparticles in the solution of water mixture, which restricted the intramolecular rotational motion of the phenyl rings linked to silole center, reduced the nonradiative decay process of silole chromophore, and led to an increase in the PL decay lifetime and the quantum efficiency.
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Flexible and Highly Sensitive Piezoresistive Pressure Sensor with Sandpaper as a Mold
Wendan Jia,Qiang Zhang,Yongqiang Cheng,Dong Zhao,Yan Liu,Wendong Zhang,Shengbo Sang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.7
Flexible pressure sensors based on piezoresistive induction have recently become a research hotspot due to the simple device structure, low energy consumption, easy readout mechanism and excellent performance. For practical applications, flexible pressure sensors with both high sensitivity and low-cost mass production are highly desirable. Herein, this paper presents a high-sensitivity piezoresistive pressure sensor based on a micro-structured elastic electrode, which is low cost and can be mass-produced by a simple method of sandpaper molding. The microstructure of the electrode surface under external pressure causes a change in the effective contact area and the distance between the electrodes, which exhibits great pressure sensitivity. The test results show that the surface structure is twice as sensitive as the planar structure under low pressure conditions. This is because of the special morphology of silver nanowires (AgNWs), which exhibits the tip of nanostructures on the surface and realizes the quantum tunneling mechanism. The sensor has high sensitivity for transmitting signals in real time and it can also be used to detect various contact actions. The low cost mass production and high sensitivity of flexible pressure sensors pave the way for electronic skin, wearable healthcare monitors and contact inspection applications.
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Chaocheng Zhao,Shuaijun Wang,Qingyun Yan,Pei Dong,Yongqiang Wang,Fang Liu,Lin Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.7
Rational design and construction of Z-scheme photocatalysts have received much attention in the fields of organic pollutants degradation and H2 evolution because of their potentials to solve the current environmental and energy crises. Herein, a novel nitrogen defects-rich 0D/2D α-Fe2O3/g-C3N4 Z-scheme photocatalyst was fabricated via a one-pot co-pyrolysis method. Quantum-sized α-Fe2O3 dots with a diameter of approximately 5 nm were uniformly distributed on the surface of 2D g-C3N4. Besides, the prepared 0D/2D α-Fe2O3/g-C3N4 composites exhibited excellent RhB degradation ability and simultaneous H2 evolution efficiency. In comparison with 2D g-C3N4, the RhB degradation rate and H2 evolution catalyzed by 0D/2D α-Fe2O3/g-C3N4 were enhanced 3.9 and 1.8 times, respectively. The improved photoredox activity was predominantly attributed to the formation of the nitrogen defects and a Z-scheme heterojunction. This study provides novel insights into the design and fabrication of nitrogen defects-rich g-C3N4-based Z-scheme photocatalysts for the simultaneous environmental purification and H2 evolution.
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Jiangjing Liu,Lanqi Li,Xiaoli Chen,Yongqiang Lu,DONG WANG 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.9
Heat stress exerts a substantial effect on dairy production. The temperature and humidity index (THI) is widely used to assess heat stress in dairy operations. Herein, we review the effects of high temperature and humidity on body temperature, feed intake, milk production, follicle development, estrous behavior, and pregnancy in dairy cows. Analyses of the effects of THI on dairy production have shown that body temperature is an important physiological parameter in the evaluation of the health state of dairy cows. Although THI is an important environmental index and can help to infer the degree of heat stress, it does not reflect the physiological changes experienced by dairy cows undergoing heat stress. However, the simultaneous measurement of THI and physiological indexes (e.g., body temperature) would be very useful for improving dairy production. The successful development of automatic detection techniques makes it possible to combine THI with other physiological indexes (i.e., body temperature and activity), which could help us to comprehensively evaluate heat stress in dairy cows and provide important technical support to effectively prevent heat stress.
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Ryu, Seong Ho,Shin, Tae Joo,Gong, Tao,Shen, Yongqiang,Korblova, Eva,Shao, Renfan,Walba, David M,Clark, Noel A,Yoon, Dong Ki Published by the American Physical Society through 2014 Physical review. E, Statistical, nonlinear, and so Vol.89 No.3
<P>We have identified a metastable liquid-crystal (LC) structure in the de Vries smectic-A* phase (de Vries Sm-A*) formed by silicon-containing molecules under certain boundary conditions. The phase transition with the metastable structure was observed in a LC droplet placed on a planar aligned substrate and LCs confined in the groove of a silicon microchannel. During the rapid cooling step, a batonnet structure was generated as an intermediate and metastable state prior to the transition that yielded the thermodynamically stable toric focal conic domains. This distinctive behavior was characterized using depolarized reflection light microscopy and grazing incidence x-ray diffraction techniques. We concluded that the silicon groups in the molecules that formed the de Vries phase induced the formation of layered clusters called cybotactic structures. This observation is relevant to an exploration of the physical properties of cybotactic de Vries phases and gives a hint as to their optoelectronic applications.</P>
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