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- 저자 : Ziyi Zhou (검색결과 6 건)
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Ziyi Zhou,Li Lai,You Dong 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
Maintenance is inevitable in the structural life cycle, due to excessive loads, poor construction, corrosion, and mechanical deterioration. Infrastructure maintenance is a sequential decision-making process, which can be modeled by partially observable Markov decision processes (POMDPs). This model constructs a general framework to parameterize the maintenance process, including intervention and observations. The former improves the mechanical performance of the system, while the latter action pertains to the detection of the component symptoms (e.g., inspection and monitoring). Information gathering from observation enhances the decision-making capacity of manager. However, imperfect measurements, such as signal noise, reduce the value of information (VoI). These measurements may induce an investment deficit in the structural management system. Therefore, the primary objective of this study is to quantify the VoI associated with different observation system. Illustrative results show that VoI presents the exponentially decreasing associated with the reducing accuracy. This property is reflected in the empirical equation which uses the logarithmic term to describe the relationship between observation accurate level and VoI. Finally, the numerical results and empirical formula indicate that the low-accuracy structural health monitoring (SHM) system should be avoided as the plausible observation may cause component failure without timely repair.
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Emission properties of sequentially deposited ultrathin CH3NH3PbI3/MoS2 heterostructures
Shao Ziyi,Xiao Junting,Guo Xiao,You Siwen,Zhang Yangyang,Li Mingjun,Song Fei,Zhou Conghua,Xie Haipeng,Gao Yongli,Sun Jiatao,Huang Han 한국물리학회 2022 Current Applied Physics Vol.36 No.-
Hybrid organic-inorganic perovskite materials have obtained considerable attention due to their exotic optoelectronic properties and extraordinarily high performance in photovoltaic devices. Herein, we successively converted the ultrathin PbI2/MoS2 into the CH3NH3PbI3/MoS2 heterostructures via CH3NH3I vapor processing. Atomic force microscopy (AFM)、Scanning electron microscopy (SEM) and X-ray photoemission spectroscopy (XPS) measurements prove the high-quality of the converted CH3NH3PbI3/MoS2. Both MoS2 and CH3NH3PbI3 related photoluminescence (PL) intensity quenching in CH3NH3PbI3/MoS2 implies a Type-II energy level alignment at the interface. Temperature-dependent PL measurements show that the emission peak position shifting trend of CH3NH3PbI3 is opposite to that of MoS2 (traditional semiconductors) due to the thermal expansion and electron-phonon coupling effects. The CH3NH3PbI3/TMDC heterostructures are useful in fabricating innovative devices for wider optoelectronic applications.
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Zhang Ziyi,Ding Honglei,Zhou Qi,Pan Weiguo,Qiu Kaina,Mu Xiaotian,Ma Junchi,Zhang Kai,Zhao Yuetong 한국탄소학회 2023 Carbon Letters Vol.33 No.4
In recent years, people are increasingly interested in CO2 hydrogenation to produce value-added chemicals and fuels (CH4, CH3OH, etc.). In the quest for an efficient treatment in CO2 methanation and methanolization, several technologies have been practiced, and DBD plasma technology gain attention due to its easily handling, mild operating conditions, strong activation ability, and high product selectivity. In addition, its reaction mechanism and the effect of packing materials and reaction parameters are still controversial. To address these problems efficiently, a summary of the reaction mechanism is presented. A discussion on plasma-catalyzed CO2 hydrogenation including packing materials, reaction parameters, and optimizing methods is addressed. In this review, the overall status and recent findings in DBD plasma-catalyzed CO2 hydrogenation are presented, and the possible directions of future development are discussed.
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Zhang Shaolong,Zhou Jingping,Shang Pengzhao,Zhao Guomeng,Wang Anlei,Mao Jinlei,Tao Yuhang,Chen Ziyi,Wang Xuehao,Guo Changying 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Tumor-associated macrophages (TAMs) are one of the main cellular components in the tumor microenvironment (TME). In many types of solid tumors, TAMs tend to accumulate in hypoxic areas and are intimately related to poor patient prognosis. However, the underlying mechanisms by which TAMs infiltrate hypoxic tumor regions remain unclear. In this study, we report that genetic deletion of SE translocation (SET) in myeloid cells inhibited the entry of TAMs into the hypoxic tumor region and abated their proangiogenic and immunosuppressive functions, ultimately inhibiting tumor growth. Mechanistically, in response to hypoxic tumor supernatant stimulation, SET in macrophages shuttled between the nucleus and cytoplasm via the PKC-CK2α signaling axis. Cytoplasmic retention of SET increased ERK and P38 signaling by inhibiting PP2A, which promoted TAM migration into the hypoxic area and polarization toward the M2 phenotype. Therefore, we conclude that SET modulates tumor immunity by acting as a key regulator of macrophage positioning and function in the tumor.
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Serrated Behaviors and Plasticity of Nb-Alloyed Cu-Based Bulk Metallic Glasses
Jili Wu,Ziyi Zhou,Zhen Peng 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.10
This paper is to disclose the plastic deformation mechanism of 3 Nb-alloyed bulk metallic glasses and composites via theanalysis of serration dynamics. The as-cast alloys with 1.0 at% and 2.0 at% of Nb element display the large time windowof serrated events, implying that the serrated behavior can dynamically retain in a long-time scale and thus the alloys areendowed the largest compressive plasticity. The statistic results suggest that the serrated flow of both alloys with 1.0 at% and2.0 at% Nb element achieves the self-organized critical state. The normal probability plots were utilized to further evaluateserrated dynamics and demonstrate that large deviations from the mean value of stress drops facilitate the self-organizedcritical state of serrations. This work suggests that large plastic bulk metallic glasses and composites are characterized bynon-normal probability of serration statistics during plastic deformation.
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Uniaxial Tensile Performance of PP-ECC: Effect of Curing Temperatures and Fly Ash Contents
Hesong Jin,Shiyu Yang,Haiyan Xu,Ziyi Xu,Fuhai Li,Yang Tian,Shuang Zhou 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.11
To investigate the influence of curing conditions and raw materials on the performance of engineered cement-based composites (ECCs), polypropylene fiber engineered cement-based composites (PP-ECCs) were designed and manufactured. The mathematical relationships between the fly ash content, curing temperature and PP-ECC tensile properties were explored by a uniaxial tensile test and by scanning electron microscopy. The results show the following: 1) with the increase in fly ash content and curing temperature, the ultimate tensile strain, ultimate tensile stress and tensile toughness index of the PP-ECC show a trend of first increasing and then decreasing, while the modulus of elasticity increases. 2) The optimum temperature is 20°C for the hydration reaction of the cementitious material inside the PP-ECC matrix. 3) When the fly ash content is 40% and the curing temperature is 20°C, the tensile mechanical parameters, ductility and toughness index of the PP-ECC are the best. This set of variables is recommended as a reference for PP-ECC engineering applications. 4) A mathematical relationship among the tensile strength, tensile strain and elastic modulus of the PP-ECC and coupling variables (fly ash content and curing temperature) is established.
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