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RISS 인기검색어
- 검색키워드
- 저자 : Hongyan Gu (검색결과 4 건)
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THE RADIO PROPERTIES OF RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES ON PARSEC SCALES
Gu, Minfeng,Chen, Yongjun,Komossa, S.,Yuan, Weimin,Shen, Zhiqiang,Wajima, Kiyoaki,Zhou, Hongyan,Zensus, J. A. IOP Publishing 2015 The Astrophysical journal Supplement series Vol.221 No.1
<P>We present the detection of the compact radio structures of 14 radio-loud narrow-line Seyfert 1 (NLS1) galaxies from Very Long Baseline Array (VLBA) observations at 5 GHz performed in 2013. While 50% of the sources of our sample show a compact core only, the remaining 50% exhibit a core-jet structure. The measured brightness temperatures of the cores range from 10(8.4) to 10(11.4) K with a median value of 10(10.1) K, indicating that the radio emission is from non-thermal jets, and that, likely, most sources are not strongly beamed, thus implying a low jet speed in these radio-loud NLS1 galaxies. In combination with archival data taken at multiple frequencies, we find that seven sources show flat or even inverted radio spectra, while steep spectra are revealed in the remaining seven objects. Although all of these sources are very radio-loud with R > 100, their jet properties are diverse in terms of their milliarcsecond (mas) scale (parsec scale) morphology and their overall radio spectral shape. The evidence for slow jet speeds (i.e., less relativistic jets), in combination with the low kinetic/radio power, may offer an explanation for the compact VLBA radio structure in most sources. The mildly relativistic jets in these high accretion rate systems are consistent with a scenario where jets are accelerated from the hot corona above the disk by the magnetic field and the radiation force of the accretion disk. Alternatively, a low jet bulk velocity can be explained by low spin in the Blandford-Znajek mechanism.</P>
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Study on the design of ZnO/PANI composites and the mechanism of enhanced humidity sensing properties
Gu Weiyuan,Zhang Hongyan,Chen Chu,Zhang Jun 한국물리학회 2022 Current Applied Physics Vol.34 No.-
ZnO/PANI composite humidity sensor was prepared by hydrothermal method. The first principles of density functional theory study the sensing mechanism. The calculation shows that the oxygen vacancy on ZnO surface is beneficial to the adsorption of water molecules. The {0 0 0‾1} crystal plane with the largest lattice oxygen number in ZnO has a strong adsorption capacity for water molecules, which is also conducive to improving the humidity sensitivity. PANI is easy to be combined on {0 1‾1 0} plane of ZnO, and it indirectly promotes the growth of {0 0 0‾1} plane, increasing the adsorption of water molecules and the proportion of H+ and H3O+ ions. In addition, the N–H group in ZnO/PANI enhances the H+ conduction, which further improves the performance of the sensor. The results concluded that the proportion of lattice oxygen in humidity sensor is an important factor of humidity sensor sensitive detection.
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Preparation and mechanism investigation of highly sensitive humidity sensor based on Ag/TiO2
Yang Chen,Zhang Hongyan,Gu Weiyuan,Chen Chu 한국물리학회 2022 Current Applied Physics Vol.43 No.-
In this paper, a high-performance silver-doped titanium dioxide (Ag/TiO2) humidity sensor was synthesized using a hydrothermal synthesis method for respiratory monitoring. The sensing mechanism was studied by the first principles of density functional theory (DFT). Calculations show that the doping of Ag+ ions increases the adsorption energy of TiO2 to water molecules. Furthermore, the Ti–O bond in TiO2 is broken due to the doping of Ag+ ions, which promotes the generation of Ti3+ defects. Experiments show that the doping of Ag+ ions can increase the hydroxide groups, Ti3+ defects and oxygen vacancies on the surface of TiO2, thus effectively improving the responsivity, linearity and hysteresis of the TiO2 humidity sensor. Compared to TiO2, the resistance of the Ag/TiO2 (0.5 mM) humidity sensor reaches 4.5 orders of magnitude with a high response of 39707.1, maximum hysteresis rate of 4.6%, response/recovery time of 31 s/15 s and the best linearity in a range of 11%– 95% RH. In addition, the Ag/TiO2 humidity sensor has been successfully used to detect different modes of respiration and determine the respiratory rate under different respiratory states. Significantly, this work demonstrates potential application value in human healthcare and activities monitoring.
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Sicong Du,Zhenhua Fu,Hongyan Gu 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.6
Modernist ideology has been on the rise recently, questioning life’s patterns and treating structures as living organisms thatcan change over time while being environmentally friendly. Yet, a wide variety of innovative materials have had an impacton the future of science and technology in the building industry. The development of economically innovative nanotechnologyalso results from cement-based high ductility materials that are earthquake resistant. Although it has been suggested thatcement-based high ductility nano-earthquake resistant materials. Thus, the goal of addressing the work is to observe the constructionof cement-based high ductility nano-earthquake resistant materials and it influence on the proposal work of houseconstructions. It uses fundamental concept, a sort of gained research which considers infrastructure effects, usage patterns,to provide a thorough evaluation of cement-based high ductility nano-earthquake resistant materials.
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