检索结果-南通市图书馆

internal dynamics of magma ocean and its linkage to atmospheres

Acta Geochimica 2022年第4期41卷 568-591页

作者： Yizhuo Zhang Nan Zhang Meng Tian Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing100871China Earth dynamics Research Group School of Earth and Planetary SciencesCurtin UniversityBentley6102WAAustralia Center for Space and Habitability Universität BernGesellschaftsstrasse 63012BernSwitzerland

Geological and astronomical observations on the‘‘lava world’’of the rocky planet,with additional theoretical interpretation of Moon’s crustal formation,bring up to the occurrence of the magma ocean and lava ponds,which inherits accretion energy of rocky planetesimal and evolves with subsequent energy *** or global oceans of silicate melt could be a widespread lava phase after rocky planet accretion as well as large impact and could persist on planets on orbits around other stars for various time *** processes of magma ocean formation and solidification change the phases,cause element segregations,and strongly affect the earliest compositional differentiation and volatile content of the terrestrial *** form the starting point for cooling to mildly habitable conditions and for the onset of thermally driven solid-state mantle *** formation and crystallization of magma oceans also influence the assembly of a core,the origin of a crust,initiation of tectonics,and formation of an *** is inevitable to investigate the magma ocean dynamics of such an early period of Earth *** review focuses on the internal dynamics of magma oceans after planetesimal accretion and planetary formation including turbulence,particle motion,and solid-state convection,which determine the associated processes of cooling,crystallization,and convection of magma *** differentiation is discussed *** thermodynamics of equilibration between a magma ocean and an overlying,outgassed atmosphere is also discussed,highlighting the need for more data on volatile solubility in silicate *** effect of coupling between magma ocean and solid-state mantle convection is also discussed.

关键词： Magma ocean Early atmosphere internal dynamics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rotational Pursuits on internal dynamics in Non-Covalent Bonded Molecular Complexes

Rotational Pursuits on Internal Dynamics in Non-Covalent Bon...

引用

第十六届全国化学动力学会议

作者： Yang Zheng Juan Wang Juncheng Lei Meng Li Walther Caminati Jens-Uwe Grabow Gang Feng Qian Gou Department of Chemistry Chongqing University Department of Chemistry University of Bologna Institut für Physikalische Chemie & Elektrochemie Leibniz-Universit?t Hannover

Rotational spectroscopy is a uniquely precise tool for the determination of molecular structure, conformational behaviors, non-covalent interaction and internal dynamics in gas phase. The internal dynamics raised from the large amplitude motions（LAMs） is one of the interesting features in rotational spectra of non-covalent bonded molecular complexes, which are characterized with tunneling splittings of rotational transitions. The width of these splittings are contributable to the corresponding rotational states, the orientations of the internal rotors in molecules, and the barriers to LAMs. Thanks to its intrinsic high resolution, the experimental data of the barrier height to the LAMs are also benchmark for theoretical calculations. In this contribution, several rotational studies on non-covalent bonded molecular complexes will be taken as examples to showcase the capability of pulsed-jet Fourier transform microwave spectroscopy combined with theoretical calculations in describing the internal dynamics, such as the pathway and the barrier height to internal rotation of water[1] and the methyl groups,[2] or the proton transfer in hydrogen bond.[3]

关键词： internal dynamics Molecular Complexes Rotational Spectrum Barrier height Fourier transform microwave spectroscopy

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

The dynamics Characteristics of Flexible Spacecraft and Its Closed-Loop Stability with Passive Control

引用

Journal of Systems Science & Complexity 2021年第3期34卷 860-872页

作者： MENG Bin ZHAO Yunbo Beijing Institute of Control Engineering Beijing 100094China Science and Technology on Space Intelligent Control Laboratory Beijing 100094China Zhejiang University of Technology Hangzhou 310014China

Passive control is the most popular methodology for flexible spacecraft while it remains an open problem whether the closed-loop performance can be achieved only with passive control subject to the coupling modes of rigid and ***,the closed-loop performance of passive PD control based on the dynamics of the Euler angle parameterization of spacecraft,which has been widely used in practice,is yet to be *** these challenges,by introducing the input-output exact linearization theory and Lyapunov theory,the authors show that the closed-loop performance for flexible spacecraft with rigid and flexible modes can be achieved by adjusting the parameters of the passive controllers sufficiently *** is done by firstly transforming the flexible spacecraft dynamics into an exact feedback linearization standard form,and then analyzing the closed-loop performance of flexible spacecraft.

关键词： Closed-loop stability flexible spacecraft internal dynamics input-output exact linearization passive control

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Output-feedback Dynamic Surface Control for a Class of Nonlinear Non-minimum Phase Systems

引用

IEEE/CAA Journal of Automatica Sinica 2016年第1期3卷 96-104页

作者： Shanwei Su Research Institute of Unmanned Aerial Vehicle Beihang University

In this paper, an output-feedback tracking controller is proposed for a class of nonlinear non-minimum phase *** keep the unstable internal dynamics bounded, the method of output redefinition is applied to let the stability of the internal dynamics depend on that of redefined output, thus we only need to consider the new external dynamics rather than internal dynamics in the process of designing control law. To overcome the explosion of complexity problem in traditional backstepping design, the dynamic surface control(DSC) method is firstly used to deal with the problem of tracking control for the nonlinear non-minimum phase systems. The proposed outputfeedback DSC controller not only forces the system output to asymptotically track the desired trajectory, but also drives the unstable internal dynamics to follow its corresponding bounded and causal ideal internal dynamics, which is solved via stable system center method. Simulation results illustrate the validity of the proposed output-feedback DSC controller.

关键词： Non-minimum phase system output-feedback trajectory tracking internal dynamics dynamic surface control(DSC)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nonlinear Feedforward and Feedback Control Design for Autonomous Underwater Glider

引用

Journal of Shanghai Jiaotong university(Science) 2011年第1期16卷 11-16页

作者：杨海马捷 State Key Laboratory of Ocean Engineering Shanghai Jiaotong University

Underwater gliders are highly efficient,buoyancy-driven,and winged autonomous underwater *** dynamics are multivariable nonlinear systems with unstable internal dynamics and thus their motion control is a significant *** improve the inherent efficiency and enhance the behavior of the underwater glider over a wide operating regime,a nonlinear feedforward and feedback controller was *** nonlinear feedforward control design is based on a new stable inversion technique which determines a causal and bounded solution for the unstable internal *** feedback control law was designed by a quadratic optimal control *** results show that the derived control system is able to deal with nonminimum phase system and successfully achieves the tracking of planned output trajectories from initial to final ***,the control effort is very low,which means the glider with limited power storage has longer range and higher endurance.

关键词： underwater glider feedforward control stable inversion internal dynamics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research advances on internal processes affecting tropical cyclone intensity change from 2018–2022

引用

Tropical Cyclone Research and Review 2023年第1期12卷 10-29页

作者： Xiaomin Chen Christopher M.Rozoff Robert F.Rogers Kristen L.Corbosiero Dandan Tao Jian-Feng Gu Falko Judt Eric A.Hendricks Yuqing Wang Michael M.Bell Daniel P.Stern Kate D.Musgrave John A.Knaff John Kaplan NOAA/OAR/Atlantic Oceanographic and Meteorological Laboratory MiamiUSA University of Alabama in Huntsville HuntsvilleUSA National Center for Atmospheric Research BoulderUSA University at Albany/State University of New York AlbanyUSA University of Bergen BergenNorway Nanjing University NanjingChina University of Reading ReadingUK University of Hawaii at Manoa HonoluluUSA Colorado State University Fort CollinsUSA University Corporation for Atmospheric Research MontereyUSA NOAA Center for Satellite Applications and Research Fort CollinsUSA Department of Atmospheric and Earth Science University of Alabama in HuntsvilleHuntsvilleUSA

This contribution summarizes the significant progress in a variety of topic areas related to internal tropical cyclone(TC)intensity change processes over 2018–2022 from the WMO Tenth International Workshop on Tropical Cyclones(IWTC-10).These topic areas include surface and boundary layer processes;TC internal structure and microphysical processes;and,radiation interactions with *** studies better frame the uncertainty in the surface drag and enthalpy coefficients at high wind *** parameters greatly impact TC intensity and it is therefore important that more direct measurements of these boundary layer parameters are *** significant scientific strides have been made in TC boundary *** advancements have been achieved through improved coupled models,large-eddy simulations,theoretical advance-ments,and detailed *** is now clear that the research field needs to better represent the eddy viscosity throughout the depth of the boundary ***,detailed study of coherent structures in TC boundary layers will likely be a propitious direction for the research ***,in-depth observational field campaigns and assiduous data analysis have made significant headway into verifying theory and modeling studies of intensification processes related to TC vortex alignment,efficient latent heating distributions,and overall 3D *** efforts have also been made to better understand the intricate roles radiative processes play in TC evolution and intensity ***,some promising progress has been made in the development of time-dependent theories of TC intensification and the predictability of internal TC intensity ***,there have been well-earned gains in the understanding of intensity change processes intrinsic to the TC system,but the journey is not *** paper highlights some of the most relevant and important research areas that are still shedding new light into internal fa

关键词： Tropical cyclone Intensity internal dynamics Boundary-layer processes Observations Predictability

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Path Following Control of Non-minimum Phase VTOL Aircraft via Minimum Distance Projection Method

Path Following Control of Non-minimum Phase VTOL Aircraft vi...

引用

第26届中国控制与决策会议

作者： Shanwei Su Research Institute of Unmanned Aerial Vehicle Beihang University

In this paper,we study the problem of path following control for a non-minimum phase vertical take-off and landing（VTOL） *** locate the point on the desired path that corresponds to the minimum distance between the aircraft’s position and the desired path,the projection method is *** the proposed controller,consisting of feed-forward and state-feedback,not only forces the VTOL aircraft to asymptotically follow the desired path,but also keeps its unstable internal dynamics be *** simulation results illustrate the effectiveness of the designed controller and the advantages of path following control over trajectory tracking control.

关键词： Path Following VTOL Aircraft Non-minimum Phase internal dynamics

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：