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Enhanced geographic information system-based mapping of local climate zones in Beijing, China

Science China(Technological Sciences) 2019年第12期62卷 2243-2260页

作者： quan JinLing State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences

The vague urban-rural dichotomy severely restricts effective comparisons and communications among urban heat island studies.A local climate zone(LCZ) scheme has therefore been developed to classify urban and natural landscapes in a standardized and universal manner. Despite LCZ mapping efforts in worldwide cities, this study attempts to propose an enhanced geographic information system-based workflow to enable the hierarchical classification of LCZs with fewer indicators but higher accuracies while considering supplementary classes and subclasses. Specifically, five morphological and coverage indicators that were easily obtained and well differentiated among LCZs were derived from a city street map and satellite images, and 25 LCZs(including 16 standard, 3 supplementary, and 6 sub-classified zones) were determined at a block-level according to the indicator hierarchy and criteria. The method was performed over Beijing, China, and evaluations by field surveys and google earth images showed a high accuracy with little noise and sharp boundaries, outperforming the widely-used remote sensing-based method of the World Urban Database and Access Portal Tools, particularly in terms of building height and heavy industry. Results also demonstrate that the Beijing core was dominated by open(including extremely open) mid-rise buildings(28.7%) and open lowrise buildings(12.8%), forming an inner-low-middle-high-outer-low annular building-height pattern. Significant land surface temperature differences were detected among the LCZs, where the low-rise and compact LCZs had higher temperatures than the mid-/high-rise and open LCZs during daytime, and subclasses LCZ XB/C/D(LCZ XE/F) generated lower(higher) temperatures than their parent classes in May. This method was proposed to augment the LCZ mapping system and further support applications(e.g., urban planning/management and climate/weather modeling) in high-density cities similar to Beijing.

关键词： geographic information system(GIS) remote sensing local climate zone(LCZ) land surface temperature urban morphology

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墙上的别样风景

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现代装饰（家居） 2016年第3期 68-75页

作者： Alan Wisniewski àlvaro Goula&Pablo Figuera Anette Stabel david quan Erika Kovesdi Edward Lee Filippo Mambretti Jordan Murphy Joel Yatscoff Moe Takemura Michelle Ivankovic Michelle Ivankovic&Laura Carwardine rebobdesign Sung Wook Park Wesley Chau 伏平范嘉苑

墙是一种象征,在远离文明的荒滩野漠,它会滋生家的联想;墙是一段历史,在纵横古今的变迁时代,它承载着一个王朝的盛哀;墙是一个屏障,在进退攻守的人际交往中,它是守护心灵的桥头堡;墙是一道风景,在四季轮回的辗转交织间,它呈现着大自然... 详细信息

墙是一种象征,在远离文明的荒滩野漠,它会滋生家的联想;墙是一段历史,在纵横古今的变迁时代,它承载着一个王朝的盛哀;墙是一个屏障,在进退攻守的人际交往中,它是守护心灵的桥头堡;墙是一道风景,在四季轮回的辗转交织间,它呈现着大自然的万般风情。如今,随着现代人对家居环境的要求日益提高,如何将家装扮得既有个性又富有内涵和独特的品味。

关键词：风景墙人际交往家居环境桥头堡大自然现代人承载

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Carboalumination-Epoxide Ring Opening for the Formation of 1,4-Disubstituted （Z）-3,6-Alkadienols

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Chinese Journal of Chemistry 2013年第6期31卷 773-778页

作者： quan Zhang Yuhuan Jing david C. Myles Yong Li Yue Chen College of Pharmacy State Key Laboratory of Elemento-Organic Chemistry and Tianjin Key Laboratory of Molecular Drug Research Nankai University Tianjin 300071 China Kosan Biosciences Inc. 3832 Bay Center Place Hayward California 94545 USA

Allylalumination of alkynes （i.e. forming Negishi＇s （Z）-alkenyl dialkylalane） followed by alkenylation of epoxides provides 1,4-disubstituted （Z）-3,6-alkadienols. The alkenylation can be facilitated by the presence of a neighbouring coordinating group in the epoxides. This ＂one-pot＂ approach has been successfully applied in the large-scale production of C 10--C 15 fragment of 9,10-didehydroepothilone D （a synthetic epothilone analog as an anti-cancer agent in phase 2 clinical trials）.

关键词： carboalumination-epoxide ring opening 1,4-disubstituted (Z)-3,6-alkadienols

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Coating Qualities Evaluation for Alkali-Metal Atomic Vapor Cells Based on Frustrated Total Internal Reflection

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Chinese Physics Letters 2014年第3期31卷 38-42页

作者： quan Wei Science and Technology on Inertial Laboratory Beihang University Beijing 100191 Fundamental Science on Novel Instrument and Navigation System Technology Laboratory Beihang University Beijing 100191

To realize accurate measurement of coating thickness and surface reliefs for alkali-metal vapor cells, a measurement method based on frustrated total internal reflection （FTIR） is proposed. Firstly, the phenomenon of frustrated total internal reflection and the theory of coating thickness measurement based on FTIR are introduced. Then a coating thickness measuring system based on FTIR is established and the coating thickness measuring experiment is carried out. Next, surface reliefs are obtained by analyzing distributions of the data of coating thickness. The experimental results indicate that the FTIR method can measure coating thickness exactly with an accuracy better than 2 nm, which can satisfy the evaluation of coating qualities for alkali-metal vapor cells.

关键词： METAL vapors RESEARCH ALKALI metals TOTAL internal reflection (Optics) SURFACE coatings PHYSICS research

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Repetitive Control for TORA Benchmark:An Additive-state-decomposition-based Approach

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International Journal of Automation and computing 2015年第3期12卷 289-296页

作者： quan quan Kai-Yuan Cai Department of Automatic Control Beijing University of Aeronautics and Astronautics

The repetitive control(RC) or repetitive controller problem for nonminimum phase nonlinear systems is both challenging and practical. In this paper, we consider an RC problem for the translational oscillator with a rotational actuator(TORA), which is a nonminimum phase nonlinear system. The major difficulty is to handle both a nonminimum phase RC problem and a nonlinear problem simultaneously. For such purpose, a new RC design, namely the additive-state-decomposition-based approach, is proposed,by which the nonminimum phase RC problem and the nonlinear problem are separated. This makes RC for the TORA benchmark tractable. To demonstrate the effectiveness of the proposed approach, a numerical simulation is given.

关键词： Additive state decomposition repetitive control translational oscillator with a rotational actuator(TORA) rotational-translation

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Cooling the Earth:a polymer-based selective thermal emitter for all-day radiative cooling

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Science China Chemistry 2021年第3期64卷 339-340页

作者： quan-Hong Yang Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityTianjin UniversityFuzhou 350207China

From fundamental thermodynamics considerations, cooling is more challenging than heating in reducing the energy consumption and relieving the greenhouse effect. While most of the currently used cooling methods require energy and resources to carry heat away, radiative cooling has attracted much attention since it can dissipate heat to outer atmosphere through a transparency window without any energy consumption [1,2].

关键词： Earth transparency thermodynamics

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Robust Hybrid Control for Ballistic Missile Longitudinal Autopilot

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Chinese Journal of Aeronautics 2011年第6期24卷 777-788页

作者： WAEL Mohsen Ahmeda WAEL Mohsen Ahmed quan quan Department of Automatic Control School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China

This paper investigates the boost phase＇s longitudinal autopilot of a ballistic missile equipped with thrust vector control. The existing longitudinal autopilot employs time-invariant passive resistor-inductor-capacitor （RLC） network compensator as a control strategy, which does not take into account the time-varying missile dynamics. This may cause the closed-loop system instability in the presence of large disturbance and dynamics uncertainty. Therefore, the existing controller should be redesigned to achieve more stable vehicle response. In this paper, based on gain-scheduling adaptive control strategy, two different types of optimal controllers are proposed. The first controller is gain-scheduled optimal tuning-proportional-integral-derivative （PID） with actuator constraints, which supplies better response but requires a priori knowledge of the system dynamics. Moreover, the controller has oscillatory response in the presence of dynamic uncertainty. Taking this into account, gain-scheduled optimal linear quadratic （LQ） in conjunction with optimal tuning-compensator offers the greatest scope for controller improvement in the presence of dynamic uncertainty and large disturbance. The latter controller is tested through various scenarios for the validated nonlinear dynamic flight model of the real ballistic missile system with autopilot exposed to external disturbances.

关键词： ballistic missiles attitude control gain-scheduling optimal tuning-control LQ optimal regulators

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CATALYTIC ACTIVITIES OF RARE-EARTH CALIXARENE COMPLEXES IN POLYMER SYNTHESES

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Chinese Journal of Polymer Science 2005年第6期23卷 593-602页

作者： Zhi-quan Shen Institute of Polymer Science Zhejiang University Hangzhou 310027 China

The studies of our group on the catalytic activities of rare earth calixarene complexes in polymer syntheses are reviewed. Rare earth calixarene complexes are effect catalysts for the polymerizations of butadiene, isoprene, ethylene, styrene, propylene oxide, styrene oxide, trimethylene carbonate and 2,2-dimethyl-trimethylene carbonate.

关键词： Rare earth complex Calixarene Polymer synthesis.

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Docking control for probe-drogue refueling: An additive-state-decomposition-based output feedback iterative learning control method

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Chinese Journal of Aeronautics 2020年第3期33卷 1016-1025页

作者： Jinrui REN quan quan Cunjia LIU Kai-Yuan CAI School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China Department of Aeronautical and Automotive Engineering Loughborough UniversityLeicestershire LE113TUUnited Kingdom

Designing a controller for the docking maneuver in Probe-Drogue Refueling(PDR) is an important but challenging task, due to the complex system model and the high precision *** order to overcome the disadvantage of only feedback control, a feedforward control scheme known as Iterative Learning Control(ILC) is adopted in this ***, Additive State Decomposition(ASD) is used to address the tight coupling of input saturation, nonlinearity and the property of Non Minimum Phase(NMP) by separating these features into two subsystems(a primary system and a secondary system).After system decomposition, an adjoint-type ILC is applied to the Linear Time-Invariant(LTI) primary system with NMP to achieve entire output trajectory tracking, whereas state feedback is used to stabilize the secondary system with input *** two controllers designed for the two subsystems can be combined to achieve the original control goal of the PDR ***, to compensate for the receiverindependent uncertainties, a correction action is proposed by using the terminal docking error,which can lead to a smaller docking error at the docking *** tests have been carried out to demonstrate the performance of the proposed control method, which has some advantages over the traditional derivative-type ILC and adjoint-type ILC in the docking control of PDR.

关键词： Additive state decomposition Adjoint operator Docking control Iterative learning control Probe-drogue refueling Stable inversion

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Condensed Galerkin element of degree m for first-order initial-value problem with O(h^(2m+2))super-convergent nodal solutions

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Applied Mathematics and Mechanics(English Edition) 2022年第4期43卷 603-614页

作者： Si YUAN quan YUAN Department of Civil Engineering Key Laboratory of Civil Engineering Safety and Durability of China Education MinistryTsinghua UniversityBeijing 100084China

A new type of Galerkin finite element for first-order initial-value problems(IVPs)is *** the trial and test functions employ the same m-degreed *** adjoint equation is used to eliminate one degree of freedom(DOF)from the test function,and then the so-called condensed test function and its consequent condensed Galerkin element are *** is mathematically proved and numerically verified that the condensed element produces the super-convergent nodal solutions of O(h^(2m+2)),which is equivalent to the order of accuracy by the conventional element of degree m+*** related properties are addressed,and typical numerical examples of both linear and nonlinear IVPs of both a single equation and a system of equations are presented to show the validity and effectiveness of the proposed element.

关键词： Galerkin method finite element method(FEM) condensed element superconvergence adjoint operator initial-value problem(IVP)

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