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control of settlement and volume loss induced by tunneling under recently reclaimed land

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Underground Space 2019年第4期4卷 289-301页

作者： A.K.l.Kwong c.c.W.Ng A.Schwob AEcOM Hong KongChina Dragages-Bouygues Joint Venture Hong KongChina

The proposed Tuen Mun-chek lap Kok link(TM-clKl)project comprises a 9-km-long dual two-lane carriageway between Tuen Mun and North lantau,Hong *** of the two tunnels at the Northern landfall Fall was carried out by two TBMs:the northbound is referred to as Ml03 and has an excavated diameter of 17.63 m,and the southbound is referred to as Ml02 and has an excavated diameter of 14.00 *** use of TBMs minimized the amount of dredging and removal of soft marine deposits,resulting in less impact to the environment within and near the work site of the *** treatment in the form of deep vibro-compaction was carried out at the sand fill and band drains installed in the marine deposit.A surcharge was also added above the final formation level to limit the residual settlement and differential settlement of the reclaimed land to less than 500 mm and 1 in 300,respectively,for a design life of 50 *** element analyses were performed to predict the settlement trough under different confinement pressures along the tunnel *** monitoring of the ground movement was carried out during the driving of the two TBMs to ensure that the design confinement pressure of the slurry would not cause excessive settlement,heave,or blow out at the shallow tunnel sections or different facilities along the tunnel *** monitoring data was then used to back-calculate the percentage of volume loss,which is a key index describing the behavior of the ground during *** monitoring data showed that the measured settlement and back-calculated volume loss were much lower than the predicted values.

关键词： TBM excavation Settlement trough Volume loss Ground treatment confinement pressure

A Survey of Human-centered Intelligent Robots:Issues and challenges

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IEEE/cAA Journal of Automatica Sinica 2017年第4期4卷 602-609页

作者： Wei He Zhijun li c.l.Philip chen IEEE School of Automation and Electrical Engineering University of Science and Technology Beijing college of Automation Science and Engineering South China University of Technology Department of computer and Information Science Faculty of Science and Technology University of Macao

Intelligent techniques foster the dissemination of new discoveries and novel technologies that advance the ability of robots to assist and support humans. The human-centered intelligent robot has become an important research field that spans all of the robot capabilities including navigation, intelligent control, pattern recognition and human-robot interaction. This paper focuses on the recent achievements and presents a survey of existing works on human-centered robots. Furthermore, we provide a comprehensive survey of the recent development of the human-centered intelligent robot and discuss the issues and challenges in the field.

关键词： Human-centered robots human-robot interaction intelligent control navigation path planning pattern recognition

Water solubility enhancements of pyrene by single and mixed surfactant solutions

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Journal of Environmental Sciences 2001年第4期13卷 491-496页

作者： Zhu, l.-z. chiou, c.T. Department of Environmental Science Zhejiang University Hangzhou 310028 China

Water solubility enhancements of pyrene by both single-surfactant and mixed-surfactant solutions were compared and evaluated. The solubility of pyrene in water was greatly enhanced by each of Triton X-100 (TX100), Triton X-405 (TX405), Brij 35 and SDS, in which the water solubility enhancements increased with increasing surfactant concentrations. The extent of solubility enhancements at surfactant concentrations below. the cMc is the order of TX100 > Brij 35 > TX405 > SDS; the sequence at surfactant concentrations above the cMc is TX100 > Brij 35 > SDS > TX405. Pyrene was solubilized synergistically by anionic-nonionic mixed surfactant solutions, especially at low surfactant concentrations. The synergistic power of the mixed surfactants is SDS-TX405 > SDS-Brij 35 > SDS-TX100. The synergism as noted is attributed to increasing Kmc and/or decreasing the cMc of the mixed surfactant solution. For SDS-TX405 and SDS-Brij 35 mixed surfactant solutions, an increase in Kmc is coupled with a decrease in the cMc; for SDS-TX100, only a decreased in the cMc value is noted. Mixed-surfactant solutions may improve the performance of the surfactant-enhanced remediation (SER) of soils by increasing the bioavailability and biodegradation of non-aqueous-phase organic pollutants and reducing the level of surfactant pollution and remediation expenses.

关键词： Biodegradation concentration (process) Solubility Water

An Attempt to Study on the Growth and Damping Rates with Approximate Solutions by Using Mathematical Models

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Plasma Science and Technology 2014年第10期16卷 897-906页

作者： l.XAPlANTERIS c.XAPlANTERIS P.lEOUSIS Plasma Physics laboratory IMSNCSR "Demokritos"AthensGreece Hellenic Army Academy Vari AtticaGreece School of Physics National and Kapodistrian University of AthensGreece Technical High School of Athens Greece

As is already known, most of the plasma literature is occupied with the plasma instabilities and the inevitable plasma waves, which remain major obstacles to the thermonuclear fusion process. Many experimental data on the plasma waves （growth or damping） and their accompanied theoretical interpretations have been published during the last five decades; lots of them have been identified and justified as well, some not yet. One of these is our previous research on plasma waves, which originated in the early 80＇s at the Plasma Physics laboratory of the NcSR ＂Demokritos＂. As the wave rising is defined by the growth rate （or the damping on the extinguishment）, these important wavy quantities will be studied in detail in the present paper. Three examples are taken from our previous theoretical results, and the first observation reveals that the involved quantities are complicated enough to be studied by themselves. So, the use of suitable approach models, which may interpret the experimental wavy quantities, is the central idea of the present attempt, Furthermore, calculations with a little change of the initial conditions have been repeated in order to determine whether the plasma behaves as a chaotic medium.

关键词： exponential changing quantities growth rate damping modeling simulation

Importance of Air-Sea coupling in Simulating Tropical cyclone Intensity at landfall

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Advances in Atmospheric Sciences 2022年第10期39卷 1777-1786页

作者： charlie c.F.lOK Johnny c.l.cHAN Ralf TOUMI School of Energy and Environment City University of Hong KongHong KongChina Department of Physics Imperial CollegeLondon SW72AZUK

An atmosphere-only model system for making seasonal prediction and projecting future intensities of landfalling tropical cyclones(Tcs)along the South china coast is upgraded by including ocean and wave models.A total of 642 Tcs have been re-simulated using the new system to produce a climatology of Tc intensity in the South china *** comparisons of the simulations from the atmosphere-only and the fully coupled systems reveal that the inclusion of the additional ocean and wave models enable differential sea surface temperature responses to various Tc characteristics such as translational speed and *** particular,interaction with the ocean does not necessarily imply a weakening of the Tc,with the coastal bathymetry possibly playing a role in causing a near-shore intensification of the *** results suggest that to simulate the evolution of Tc structure more accurately,it is essential to use an air-sea coupled model instead of an atmosphere-only model.

关键词： tropical cyclone intensity tropical cyclone landfall seasonal prediction air-sea coupling

Advances in additively manufactured titanium alloys by powder bed fusion and directed energy deposition:Microstructure,defects,and mechanical behavior

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Journal of Materials Science & Technology 2024年第16期183卷 32-62页

作者： H.Y.Ma J.c.Wang P.Qin Y.J.liu l.Y.chen l.Q.Wang l.c.Zhang centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA 6027SA School of Engineering M050The University of Western Australia35 Stirling HighwayCrawleyPerthWA 6009SA Institute of Metals College of Material Science and EngineeringChangsha University of Science&TechnologyChangsha 410004China School of Material Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China State Key laboratory of Metal Matrix composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Ti and its alloys have been broadly adopted across various industries owing to their outstanding proper-ties,such as high strength-to-weight ratio,excellent fatigue performance,exceptional corrosion resistance and so *** manufacturing(AM)is a complement to,rather than a replacement for,traditional manufacturing *** enhances flexibility in fabricating complex components and resolves machin-ing challenges,resulting in reduced lead times for custom ***,owing to distinctions among various AM technologies,Ti alloys fabricated by different AM methods usually present differences in mi-crostructure and defects,which can significantly influence the mechanical performance of built ***,having an in-depth knowledge of the scientific aspects of fabrication and material properties is crucial to achieving high-performance Ti alloys through different AM *** article reviews the mechanical properties of Ti alloys fabricated by two mainstream powder-type AM techniques:powder bed fusion(PBF)and directed energy deposition(DED).The review examines several key aspects,en-compassing phase formation,grain size and morphology,and defects,and provides an in-depth analysis of their influence on the mechanical behaviors of Ti *** review can aid researchers and engi-neers in selecting appropriate PBF or DED methods and optimizing their process parameters to fabricate high-performance Ti alloys for a wide range of industrial applications.

关键词： Powder bed fusion Directed energy deposition Titanium alloys Phase transformation Defects Mechanical property

Short-circuit fault analysis and isolation strategy for matrix converters

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Journal of central South University 2015年第9期22卷 3458-3470页

作者：王莉娜 l.De lillo c.Brunson l.Empringham P.Wheeler School of Automation Science and Electrical Engineering Beihang University Department of Electrical and Electronic Engineering The University of Nottingham

The behavior of matrix converter(Mc) drive systems under the condition of Mc short-circuit faults is comprehensively investigated. Two isolation strategies using semiconductors and high speed fuses(HSFs) for Mc short-circuit faults are examined and their performances are compared. The behavior of Mc drive systems during the fuse action time under different operating conditions is explored. The feasibility of fault-tolerant operation during the fuse action time is also studied. The basic selection laws for the HSFs and the requirements for the passive components of the Mc drive system from the point view of short-circuit faults are also discussed. Simulation results are used to demonstrate the feasibility of the proposed isolation strategies.

关键词： matrix converter short-circuit fault fault analysis fault behavior fault isolation

coupling textural and stable-isotope variations in fluvial stromatolites:comparison of Pleistocene and recent records in NE Spain

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Journal of Palaeogeography 2019年第2期8卷 150-169页

作者： c.Arenas M.c.Osácar l.Auqué c.Sancho Department of Earth Sciences University of Zaragoza Geotransfer Group and Institute for Research on Environmental Sciences of Aragón(IUcA)

Textural and stable isotopic features of two middle Pleistocene fluvial stromatolite profiles are compared to a recent stromatolite,both formed in the River Piedra system(NE Spain),to test the reliability of climatic,hydrologic and depositional information derived from ancient *** Pleistocene stromatolites formed in a multi-domed,highly-inclined *** recent stromatolite also formed in a highly-inclined cascade of the River Piedra,the sedimentary conditions of which were periodically examined between the years 2000 and *** Pleistocene stromatolites are formed of an alternation of 1) thin large-crystal laminae(type A),with elongated crystals up to 1 mm long,and 2) thick small-crystal laminae(type B),consisting of cyanobacterial fan-and bushshaped *** textural and isotopic comparison with the recent stromatolite shows that each A–B couplet corresponds to one *** type-A laminae are comparable to the macrocrystalline laminae that occur in the cool-period deposits of the recent stromatolite,and the type-B laminae are comparable to the warm-period deposits of the recent *** temperatures(Tw),calculated from δ^(18)O_(calcite) and present measures of δ^(18)O_(water),were similar in the Pleistocene and recent specimens,and close to the measured river ***,the Pleistocene stromatolites formed not far from isotopic equilibrium,as did the recent *** Pleistocene δ^(18) O_(calcite) biannual oscillation is wider in amplitude than in the recent stromatolite,which suggests larger differences in Tw through the year in the Pleistocene than at *** Pleistocene δ^(13)c_(calcite) does not show any pattern;and the values are slightly higher than the recent *** co-evolution of δ^(18)O and δ^(13)c is parallel in the Pleistocene stromatolites,matching the recent stromatolite *** results and their comparison with other ancient examples prove that textural and isotopic features in ancient stromatolites

关键词： Tufa Recent and ancient stromatolites Stable isotopes Biotic and abiotic laminae Intra-annual and inter-annual water temperature variations

A Novel Melt Processing for Mg Matrix composites Reinforced by Multiwalled carbon Nanotubes

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Journal of Materials Science & Technology 2016年第12期32卷 1303-1308页

作者： H.l.Shi X.J.Wang c.l.Zhang c.D.li c.Ding K.Wu X.S.Hu School of Materials Science and Engineering Harbin Institute of Technology

carbon nanotubes（cNTs） reinforced Mg matrix composites were fabricated by a novel melt *** novel processing consisted of two courses：cNTs pre-dispersion and ultrasonic melt *** ball-milling was employed to pre-disperse cNTs on Zinc（Zn） *** cNT entanglements were well dispersed to single cNT or tiny clusters on Zn *** ultrasonic melt processing further dispersed cNTs in the Mg melt,especially tiny cNT ***,a uniform dispersion of cNTs was achieved in the as-cast *** extrusion further improved the distribution of *** increased both the strength and elongation of the matrix ***,the elongation of the matrix alloy was enhanced by 40%.Grain refinement and the pulling-out of cNTs resulted in the evident improvement of ductility for the composites.

关键词： Pre-dispersion carbon nanotubes Magnesium matrix composites Ultrasonic