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Quasi-periodic orbits of small solar sails with time-varying attitude around Earth–Moon libration points

Astrodynamics 2024年第1期8卷 161-174页

作者： Toshihiro chujo Department of Mechanical Engineering School of EngineeringTokyo Institute of TechnologyTokyo152-8550Japan

This paper proposes new quasi-periodic orbits around Earth–Moon collinear libration points using solar *** including the time-varying sail orientation in the linearized equations of motion for the circular restricted three-body problem(CR3BP),four types of quasi-periodic orbits(two types around L1 and two types around L2)were *** them,one type of orbit around L2 realizes a considerably small geometry variation while ensuring visibility from the Earth if(and only if)the sail acceleration due to solar radiation pressure is approximately of a certain magnitude,which is much smaller than that assumed in several previous *** means that only small solar sails can remain in the vicinity of L2 for a long time without propellant *** orbits designed in the linearized CR3BP can be translated into nonlinear CR3BP and high-fidelity ephemeris models without losing geometrical *** this study,new quasi-periodic orbits are formulated,and their characteristics are ***,their extendibility to higher-fidelity dynamic models was verified using numerical examples.

关键词： solar sail libration point orbit Earth-Moon system circular restricted three-body problem(CR3BP)

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日产汽车公司新5.6L V8汽油机的开发

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汽车与新动力 2012年第1期44卷 1-6页

作者： Amari k Ando S chujo k Sakai T Miyake H 朱炳全不详

为了满足人们对更清洁汽车、更好燃油经济性和更佳发动机性能日益增长的需求,日产汽车公司开发了新Vk56 VD型汽油机。这款5.6 L V8汽油机将被用于新Infiniti M56运动型豪华轿车。为了提高功率和效率,同时减少发动机对环境的影响,该汽油... 详细信息

为了满足人们对更清洁汽车、更好燃油经济性和更佳发动机性能日益增长的需求,日产汽车公司开发了新Vk56 VD型汽油机。这款5.6 L V8汽油机将被用于新Infiniti M56运动型豪华轿车。为了提高功率和效率,同时减少发动机对环境的影响,该汽油机采用气门动作和升程连续可变、汽油直接喷射等关键技术。介绍了Vk56 VD型汽油机的细节,以及所用技术的亮点和开发措施。

关键词： V8汽油机升程连续可变汽油直接喷射燃油耗排放

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Molecular design and application of luminescent materials composed of group 13 elements with an aggregation-induced emission property

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National Science Review 2021年第6期8卷 80-93页

作者： Shunichiro Ito Masayuki Gon kazuo Tanaka Yoshiki chujo Department of Polymer Chemistry Graduate School of EngineeringKyoto University

Complexation of π-conjugated ligands by metal or semimetal ions leads to the enhancement of the planarity and rigidity of π-conjugated systems. Boron, especially, has played a central role in the design of luminescent main-group complexes. However, these complexes still suffer the disadvantage of aggregation-caused quenching as well as typical organic fluorophores. It has recently been reported that some types of boron complexes exhibit the aggregation-induced emission(AIE) property. Moreover, AIE behavior from complexes and organometallic compounds composed of the other group 13 elements, such as aluminum and gallium, has emerged in this decade. These observations greatly encourage us to develop advanced functional materials based on the group 13 elements. Indeed, recent research has demonstrated that these classes of materials are potentially versatile scaffolds for constructing chromic luminophores,efficiently emissive π-conjugated polymers and so on. This review mainly describes AIE-active group 13 complexes with four-coordinate structures and their application as photo-functional materials. Proposed mechanisms of the origins of AIE behavior are briefly discussed.

关键词： aggregation-induced emission crystallization-induced emission chromism conjugated polymer group 13

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Comparison of luminescent properties of helicene-like bibenzothiophenes with o-carborane and 5,6-dicarba-nidodecaborane

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Science China Chemistry 2018年第8期61卷 940-946页

作者： kenta Nishino kazushi Hashimoto kazuo Tanaka Yasuhiro Morisaki Yoshiki chujo Department of Polymer Chemistry Graduate School of Engineering Kyoto University Department of Applied Chemistry for Environment School of Science and Technology Kwansei Gakuin University

This article describes comparison of the anchoring effect on electronic properties of the helicene-like bibenzothiophene between o-carborane and 5,6-dicarba-nido-decaborane. The o-carborane and nido-decaborane-fused bibenzothiophenes were simultaneously obtained in the same reaction and successfully isolated. Initially, the X-ray single crystal analysis revealed that the helicene-like distorted structure was realized in the nido-decaborane-fused bibenzothiophene. From optical measurements in the solution state, distinct different characteristics depending on the type of anchors were observed. It was summarized that the absorption and luminescent properties originated from weak π-conjugation at the bibenzothiophene moiety in the o-carboranefused compound were obtained, whereas robust π-conjugation and significant emission from the intramolecular charge transfer state were detected from the nido-decaborane-fused compound. These data can be explained by the theoretical results that π-conjugation was restrictedly developed within the bibenzothiophene moiety in frontier orbitals of the o-carborane-fused compound. In contrast, π-conjugation can be constructed even through the distorted bibenzothiophene because of the nido-decaborane unit. Moreover, the intramolecular charge transfer state should be realized because of electronic interaction involving the nido-decaborane unit in the excited state. Furthermore, it was demonstrated that the nido-decaborane-fused compound possessed solid-state emission and mechanochromic luminescent properties. The π-conjugation on the distorted structure supported by the nido-decaborane anchor should play a significant role in suppressing aggregation-caused quenching followed by presenting solid-state emission with stimuli responsiveness.

关键词：光性质硼碳电子相互作用混合物电子性质状态抛锚

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