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- 저자 : Chengzhi Ma (검색결과 4 건)
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Chao Ma,Dechun Lu,Chengzhi Qi,Xiuli Du 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.78 No.5
Great efforts have been conducted to investigate the seismic performances of the arch and rectangular underground structures, however, the differences between seismic responses of these two types of underground structures, especially the vault radian influencing the seismic responses of arch structures are not clarified. This paper presents a detailed numerical investigation on the seismic responses of arch underground structures with different vault radians, and aims to illustrate the rule that vault radian affects the seismic responses of underground structures. Five arch underground structures are built for nonlinear soil-structure interaction analysis. The internal forces of the structural components of the underground structures only under gravity are discussed detailedly, and an optimum vault radian for perfect load-carrying functionality of arch underground structures is suggested. Then the structures are analyzed under seven scaled ground motions, amounting to a total of 35 dynamic calculations. The numerical results show that the vault radian can have beneficial effects on the seismic response of the arch structure, compared to the rectangular underground structures, causing the central columns to suffer smaller axial force and horizontal deformation. The conclusions provide some directive suggestions for the seismic design of the arch underground structures.
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Study of the Non-Linearity on TiO2(0 0 1) Surface with Oxygen Defects: A First-Principles Study
Yuehua Dai,Xu Zhang,Chengzhi Ma,Zhiyong Pan,Feifei Wang,Wenjuan Lu,Jin Yang,Fei Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.8
First-principles plane-wave pseudopotential calculations were performed to study the energetics and electronic structures of oxygen defects on rutile TiO2(0 0 1). The influence of the material thickness on non-linearity (NL) was studied. With the increase in the thickness, the NL became stronger. Calculating the site-projected density of states by applying an external electric field showed that the NL of the bulk is due to the exchange of electrons between O 2p orbitals and Ti 3d orbitals. Finally, the influence of oxygen defects—oxygen vacancies (Vo), oxygen interstitials (Oi), and oxygen vacancies/oxygen interstitial (Vo + Oi) pairs (Frenkel pair defects)—on the NL of TiO2 was studied. These results demonstrate that the band gap (Eg) of TiO2 became gradually narrower as the electric field increased. The Stark effect and defects can lead to the splitting of degenerate energy levels. Stronger electric fields increase the band splitting and reduce Eg. With the increase in the Vo concentration, the decrease in the splitting amplitude and width of the energy level lead to weakening of the transfer of electrons between O and Ti atoms and optimizing the NL of TiO2. Therefore, the incorporation of Vo plays a significant role in improving the NL of TiO2.
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Numerical semi-empirical modeling of lidar attenuation characteristics in atmosphere
Tan Zhuangbin,Zhang Yan,Yang Yang,Chen Jintao,Qu Chengzhi,Ma Feifan 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.12
Long-distance measurement of lidar is a critical problem in various felds, such as airborne lidar detection, surveying, and mapping. Attenuation characteristic is the key factor afecting the lidar detection capability. However, some long-distance measurement methods based on the widely used and validated theoretical models are usually inefcient, while others relying on empirical models have limited applications due to experimental difculties. This study proposes a semi-empirical model of long-distance measurement based on the Beer–Lambert–Bouguer law adopting mathematical methods. Compared to the theoretical model, the calculation efciency of the semi-empirical model we constructed has been improved by more than two orders of magnitude, and the accuracy can reach more than 98% of the theoretical model. Compared to other empirical models, its accuracy is closer to the theoretical model, and the computational efciency is similar. It can be more efectively applied to the actual long-distance detection scene.
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Shiqi Liu,Xiangting Hou,Chengze Yu,Xiangrui Pan,Junhao Ma,Guocheng Liu,Chengzhi Zhou,Yanjun Xin,Qinghua Yan 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
Among the bromine flame retardants, tetrabromobisphenol A (TBBPA) is a highly effective flame retardantthat can be used as both reactive and additive. However, the synthesis reaction of TBBPA has alow conversion rate and many brominated phenolic organics. Therefore, there is an urgent need toremove brominated organic pollutants produced in the process of producing flame retardants to reducethe harm to the environment and human beings and to reduce production costs. In this study, an efficientprocess was developed to treat the wastewater and waste residue generated in TBBPA production process,realizing its harmless and resource utilization. In the resource utilization system, through the ingeniousdesign of solution mixing, precipitation separation, three-effect evaporation and concentration,valuable substances were extracted to realize the recovery and reuse of wastewater. In the harmless utilizationprocess of hazardous waste residue, through high-temperature pyrolysis at 500 C for 2 h afteroptimization with hypoxia-hyperoxia atmosphere modulation, it can avoid the production of dioxinsand carbon black, effectively remove the organic impurities, realize the harmlessness and obtain highqualitysodium sulfate. This paper aims to propose a simple, efficient and feasible utilization system,including the three major technological processes of TBBPA production, integrated wastewater treatmentand optimized the harmless treatment of waste residue to obtain sodium sulfate, so as to realize TBBPAgreen production. Compared with the traditional TBBPA synthesis system, wastewater and waste residuetreatment processes, the TBBPA quality is increased by 2 % and the economic cost is reduced by 10 %,which is of great significance to the development of the industry.
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