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Design of Projection Optical System for Target Imaging Simulator with Long Exit Pupil Distance
Xueyuan Cao,Lingyun Wang,Guangxi Li,Ru Zheng 한국광학회 2023 Current Optics and Photonics Vol.7 No.6
In order to test the recognition ability and accuracy of a target imaging simulator under the irradiation of solar stray light in a laboratory environment, it needs to be fixed on a five-axis turntable during a hardware-in-the-loop simulation test, so the optical system of the simulator should have a long exit pupil distance. This article adopts a secondary imaging method to design a projection optical system suitable for thin-film-transistor liquid crystal displays. The exit pupil distance of the entire optical system is 1,000 mm, and the final optimization results in the 400 nm–850 nm band show that the modulation transfer function (MTF) of the optical system is greater than 0.8 at the cutoff frequency of 72 lp/mm, and the distortion of each field of view of the system is less than 0.04%. Combined with the design results of the optical system, TracePro software was used to model the optical system, and the simulation of the target imaging simulator at the magnitude of −1 to +6 Mv was analyzed and verified. The magnitude er-ror is less than 0.2 Mv, and the irradiance uniformity of the exit pupil surface is greater than 90%, which meets the requirements of the target imaging simulator.
Outstanding Synergy of Superior Strength and Ductility in Heterogeneous Structural 1045 Carbon Steel
Zhengning Li,Peiqing La,Jie Sheng,Yu Shi,Xueyuan Zhou,Qian Meng 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
Superior strength-ductility synergy of 1045 carbon steel produced by aluminothermic reaction casting method was obtainedthrough large deformation rolling at ambient temperature and subsequent annealing, meanwhile, a heterogeneous compositestructure was fabricated. The heterogeneous structural 1045 carbon steel consists of “soft” microcrystalline/ultrafine grained(UFG) ferrite and “hard” cementite nanoparticles. The outstanding strength-ductility synergy was primarily attributed tothe microstructure characteristics about the “soft/hard” interfaces of heterogeneous composite structure. The strength wasimproved due to the second phase reinforcement of hard cementite nanoparticles and decreasing of ferrite grain size, meanwhile,the back stress hardening capacity of “soft/hard” phase also resulted in the high strength. And the favorable ductilitywas ascribed to the generation of geometrically necessary dislocations (GNDs) around “soft/hard” interfaces, which resultedin the high work hardening capability of heterogeneous structural 1045 carbon steel. It is remarkable that tensile strength(∼ 1190 MPa) and high yield strength (∼ 1118 MPa) and good ductility (∼10.6%) can be simultaneously acquired for thecold rolled 1045 steel after annealing at 673 K for 1 h.
PATH TRACKING FOR AUTONOMOUS RACE CAR BASED ON G-G DIAGRAM
Miaomiao Fu,Jun Ni,Xueyuan Li,Jibin Hu 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.4
Currently, the autonomous driving technique is attracting increasing research focus from all over the world. Generally, the control systems of an autonomous vehicle include environment perception, path planning and path tracking control systems. In this paper, the path tracking control issue of the autonomous vehicle will be focused on. Few of the previous proposed path tracking controllers consider the vehicle driving and handling limit, which degenerates the potential of the autonomous vehicle to finish the desired path as quick as possible. To this end, this paper proposes a path tracking controller for autonomous vehicle, which aims at pushing it to the driving and handling limit. The limit dynamic performance of the autonomous vehicle is represented by the G-G diagram, which indicates the acceleration capability of the autonomous vehicle. The G-G diagram is obtained by phase portrait method and it is validated by a modified FSAE racing car. Finally, a path tracking controller based on the G-G diagram is proposed. The simulation validation results demonstrate the effectiveness of the proposed controller.
Chen Ting,Liu Pengfei,Liu Tianxiao,Li Xueyuan,Wang Huihui,He Tingwei,Liu Zhiyong 한국물리학회 2024 Current Applied Physics Vol.58 No.-
Electron transport layer (ETL) plays an important role in perovskite solar cells (PSCs). In this paper, a stable and cheap metal chelating agent, subnitrotriacetic acid (NTA), was used to modify SnO2 ETL in two ways:1) By incorporating NTA into SnO2 colloidal dispersion, the oxygen vacancy causing charge recombination was greatly reduced, and the recombination of psc was reduced by reducing the introduction of surface Ovs, 2) Spin-coating NTA at the SnO2/perovskite interface not only manages a large number of oxygen vacancies generated by high-temperature annealing, but also interacts with the unpaired Pb2+ in the perovskite absorption layer by interface modification of the C=O bond in NTA, passivates the surface of the perovskite layer, inhibits ion migration, stabilize the perovskite structure, and avoid its collapse, while significantly reducing the defect state density. By inhibiting the shallow interface trap and reducing the non-radiative recombination, efficient and stable perovskite solar cells were prepared. Under the condition of relative humidity greater than 40 % (RH), the efficiency of perovskite solar cells prepared by interface-anchored NTA was increased to 22.6 %, and the stability was significantly enhanced.