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syntheses,structures,and reactivity of ruthenium(Ⅱ) hydride complexes containing Klui's oxygen tripodal ligand

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science China Chemistry 2010年第10期53卷 2139-2143页

作者： NG Ho-Yuen LAI Chun-sing WILLIAMs ian D. LEUNG Wa-Hung Department of Chemistry The Hong Kong University of Science and Technology

Treatment of Ru(CO)(Cl)(H)(PPh3)3 with NaLOEt (LOEt-= [CpCo{P(O)(OEt)2}3]-) afforded the hydride complex (PPh3)(CO)-LOEtRu(H) (1), which has been characterized by X-ray crystallography. similarly, the tricyclohexylphosphine analogue, (PCy3)(CO)LOEtRu(H) (2), was synthesized from Ru(CO)Cl(H)(PCy3)2 and NaLOEt. Treatment of complex 1 with R'sO2N3 afforded the (arylsulfonyl)amido complexes LOEtRu(CO)(PPh3)(NHsO2R) (R = 2,4,6-i-Pr3C6H2 (3), 4-t-BuC6H4 (4)). The crystal structure of complex 3 has been determined. The Ru-N distance and Ru-N-s angle in 3 are 2.076(3) and 126.14(16)°, respectively. Reactions of complex 1 with acids have been studied.

关键词： ruthenium oxygen tripodal ligand hydride complex (arylsulfonyl)amido complex

Nonlinear Control of Magnetically-geared Drive-trains

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International Journal of Automation and computing 2013年第4期10卷 319-326页

作者： Ryan Montague chris Bingham Department of Computer science University of York school of Engineering University of Lincoln

The paper considers certain impedimental issues related to the use of magnetic gearbox and magnetic coupling technologies in high performance servo control systems. A prototype magnetic coupling is used as a basis for demonstrating that the underlying torque transfer characteristic is significantly nonlinear when transmitted torque approaches the maximum designed pull-out torque of the device. It is shown that linear controllers for speed control proportional plus integral （PI） and position control proportional plus derivative （PD） result in acceptable performance provided the magnetic coupling operates below 80 % of designed pull-out torque. To fully compensate for the inherent nonlinearity of the torque transfer characteristic, feedback linearizing control laws and state transformations are derived resulting in exactly linear input-output characteristic for position and speed control of magnetically-geared drive-trains. With the addition of state feedback, the closed-loop dynamics for both position and speed control of a magnetically-geared drive-train can be designed to satisfy the integral of time multiplied by absolute error （ITAE） optimized linear response for a step input. Outstanding results are demonstrated through simulation and experimental real-time implementation on a demonstrator magnetically-geared drive-train.

关键词： Magnetic gears magnetic couplings linear control nonlinear control feedback linearization.

Lag times in toe-to-heel air injection(THAI)operations explain underlying heavy oil production mechanisms

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Petroleum science 2022年第3期19卷 1165-1173页

作者： Wei Wei ian D.Gates Department of Chemical and Petroleum Engineering University of CalgaryCalgaryAlbertaCanada

From a time value of revenue point of view,it is preferred that the time between reservoir stimulation and oil production response is *** oil combustion processes have a lag time between air injection and liquid production,but the common practice in production data analysis uses simultaneous injection and production data when seeking a relationship between *** this research,the time scales of production for the Kerrobert toe-to-heel air injection(THAI)heavy oil project in saskatchewan,Canada,is analyzed by using cross correlation analysis,*** delay analysis between air injection and oil *** results reveal two time scales with respect to production response with two distinctive recovery mechanisms:(1)a short time scale response(nearly instantaneous)where oil production peaks right after air injection(directly after opening production well)reflecting cold heavy oil production mechanisms,and(2)a longer time scale(of order of 100-300 days)response where peak production occurs associated with the collective phenomena of air injection,heat generating reactions,heat transfer,and finally,heated mobilized heavy oil drainage to the production *** understanding of the two time scales and associated production mechanisms provides a basis for improving the performance of THAI.

关键词： Heavy oil In situ combustion Toe-to-heel air injection(THAI) Production analysis Lag time

The Roper-suffridge extension operator and classes of biholomorphic mappings Dedicated to Professor sheng GONG on the occasion of his 75th birthday

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science China Mathematics 2006年第11期49卷 1539-1552页

作者： GRAHAM ian KOHR Gabriela Department of Mathematics University of Toronto TorontoOntario M5S 2E4Canada Faculty of Mathematics and Computer science Babes-Bolyai University 1 M. Kogǎlniceanu Str. 400084 Cluj-NapocaRomania

In this paper we give a survey about the Roper-suffridge extension operator and the developments in the theory of univalent mappings in several variables to which it has led. We begin with the basic geometric properties (most of which now have a number of different proofs)and discuss relations with the theory of Loewner chains and generalizations and modifications of the operator, some of which are very recent.

关键词： convex mapping, starlike mapping, Roper-suffridge operator, growth theorem, distortion theorem, covering theorem, Loewner chain, parametric representation,extreme points, linear invariant family.

Investigating the physics of disruptions with real-time tomography at JET

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Plasma science and Technology 2022年第3期24卷 80-88页

作者： Diogo R FERREIRA Pedro J CARVALHO Ivo s CARVALHO chris I sTUART Peter J LOMAs JET Contributors 无 Instituto de Plasmas e Fusão Nuclear(IPFN) Instituto Superior Técnico(IST)Universidade de LisboaAv.Rovisco Pais 11049-001 LisboaPortugal Culham Centre for Fusion Energy(CCFE) UK Atomic Energy Authority(UKAEA)Culham Science CentreAbingdonOX143DB OxfordshireUnited Kingdom see the author list of E.Joffrin et al 2019 Nucl Fusion 59112021 EUROfusion Consortium JETCulham Science CentreAbingdonOX143DBUK

As JET is developing and testing operational scenarios for higher fusion performance,an increase in pulse disruptivity is being *** a deeper analysis,we find that several radiative phenomena play an active role in determining the outcome of the *** analysis is enabled by the use of real-time tomography based on the bolometer *** though plasma tomography is an inverse problem,we use machine learning to train a forward model that provides the radiation profile directly,based on a single matrix multiplication *** model is used to investigate radiative phenomena including sawtooth crashes,ELMs and MARFE,and their relationship to the radiated power in different regions of *** particular,we use realtime tomography to monitor the core region,and to throw an alarm whenever core radiation exceeds a certain *** results suggest that this measure alone can anticipate a significant fraction of disruptions in the JET baseline scenario.

关键词： plasma tomography machine learning plasma disruptions

Nucleoside modified mRNA-lipid nanoparticles as a new delivery platform for the repair of the injured spinal cord

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Neural Regeneration Research 2025年第8期20卷 2311-2312页

作者： Krisztián Pajer Tamás Bellák Antal Nógrádi Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary

spinal cord injury and treatment opportunities:The adult mammalian spinal cord has a very limited capacity for spontaneous regeneration due to various intrinsic molecular and cellular *** the spinal cord neurons have the capacity to regenerate their axons,the expression of growth inhibitory factors,lack or suppression of proper guidance cues,and profound inflammatory responses do not permit successful regeneration(Khyeam et al.,2021).

关键词： injured capacity modified

Biodiversification of Late Ordovician Hirnantia Fauna on the Upper Yangtze Platform,south China

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science China Earth sciences 2010年第12期53卷 1800-1810页

作者： ian G.PERCIVAL Geological survey of New south Wales NSW Department of Primary Industries947-953 Londonderry RoadLondonderryNSW 2753Australia

The Hirnantia Fauna is a globally-represented,cool water brachiopod fauna that originated and flourished in shallow marine environments at intermediate to low latitudes after the first episode of the end-Ordovician mass *** was well-developed,widely distributed,long in stratigraphical range,and complex in palaeoecological differentiation on the Upper Yangtze Platform of the south China paleoplate,where it has been extensively *** and quantitative analyses show that the FAD of the Hirnantia Fauna in south China becomes stratigraphically higher from nearshore to offshore localities on the Yangtze Platform,while the range of the fauna becomes shorter whereas the taxonomic diversity *** its stratigraphical range the diversity of the Hirnantia Fauna at nearshore localities consistently decreases,but trends in the opposite direction at offshore,deeper water *** fauna was represented by different communities,subcommunities or associations with changing environmental factors(such as water depth and substrate) at different localities or horizons.

关键词： Hirnantia Fauna biodiversification Ordovician Hirnantian Upper Yangtze Platform south China

self-assembly and chemical processing of block copolymers:A roadmap towards a diverse array of block copolymer nanostructures

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science China Chemistry 2013年第8期56卷 1040-1066页

作者： WYMAN ian LIU GuoJun Department of Chemistry Queen's University

Block copolymers can yield a diverse array of *** assembly structures are influenced by their inherent structures,and the wide variety of structures that can be prepared especially becomes apparent when one considers the number of routes available to prepare block copolymer *** examples include self-assembly,directed assembly,coupling,as well as hierarchical assembly,which can yield assemblies having even higher structural *** assembly routes can also be complemented by processing techniques such as selective crosslinking and etching,the former technique leading to permanent structures,the latter towards sculpted and the combination of the two towards permanent sculpted *** combination of these pathways provides extremely versatile routes towards an exciting variety of *** review will attempt to highlight destinations reached by LIU Guojun and coworkers following these pathways.

关键词： block copolymers self-assembly chemical processing crosslinking

Time averaged consensus in a direct coupled coherent quantum observer network

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Control Theory and Technology 2017年第3期15卷 163-176页

作者： ian R. PETERsEN Research school of Engineering The Australian National University Canberra ACT 2601 Australia

This paper considers the problem of constructing a direct coupling quantum observer for a closed linear quantum system. The proposed distributed observer consists of a network of quantum harmonic oscillators and it is shown that the observer network converges to a consensus in a time averaged sense in which each element of the observer estimates the specified output of the quantum plant. An example and simulations are included to illustrate the properties of the observer network.

关键词： Quantum systems quantum observers quantum networks