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China(Shanghai) Pilot Free Trade Zone Embarks on A New Journey of High-Standard Institutional opening-Up

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China Forex 2024年第1期 34-36页

作者： ZHAO Xiaolei Instituteof Free Trade Zone Studies at Shanghai University of Finance and Economics

On December 7,2023,the State Council officially released the General Plan for Advancing High-Standard Institutional opening-Up of China(Shanghai)Pilot Free Trade Zone in Alignment with High-Standard International Econ... 详细信息

关键词： Trade opening Institutional

Integrated Promotion of High-quality opening-up and High-level Security in Foreign Exchange Administration under the Capital Account

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China Forex 2024年第1期 51-54页

作者： XIAO Sheng SAFE's Capital Account Management Department

CHINA FOREX:In2023,what work has been done to promote the high-level opening-up of the capital account,and what has been done towards serving the real economy with foreign exchange administrated under the capital acco... 详细信息

关键词： opening serving Exchange

China Releases Policies to Expand opening-up

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China Weekly 2024年第1期 10-11页

China's State Council on December 7 released a plan on highlevel institutional opening-up in the Shanghai Free Trade Zone,proposing to build Shanghai into a demonstration area for national institutional opening-up and... 详细信息

关键词： Release opening Trade

The GOAT Celebrates Belated Grand opening After Three Exciting Years

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城市漫步（GBA版） 2024年第1期 I0010-I0011页

作者： Joshua Cawthorpe 不详

The GOAT in Panyu held its official Grand opening Party on January 13.And surely that has you asking yourself,"What's that you say?Didn't they open three years ago?"

关键词： opening Grand yourself

Failure behavior around a circular opening in a rock mass with non-persistent joints:A parallel-bond stress corrosion approach

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Journal of Central South University 2017年第10期24卷 2406-2420页

作者：杨旭旭靖洪文陈坤福杨圣奇 State Key Laboratory for Geomechanics & Deep Underground Engineering China University of Mining and Technology Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and Technology Rock Mass Modeling and Computational Rock Mechanics Laboratories University of Arizona

The stability of underground excavations is influenced by discontinuities interspaced in surrounding rock masses as well as the stress condition. In this work, a numerical study was undertaken on the failure behavior around a circular opening in a rock mass having non-persistent open joints using PFC software package. A parallel-bond stress corrosion(PSC) approach was incorporated to drive the failure of rock mass around the circular opening, such that the whole progressive failure process after excavation was reproduced. Based on the determined micro parameters for intact material and joint segments, the failure process around the circular opening agrees very well with that obtained through laboratory experiment. A subsequent parametric study was then carried out to look into the influence of lateral pressure coefficient, joint dip angle and joint persistency on the failure pattern and crack evolution of the rock mass around the circular opening. Three failure patterns identified are step path failure, planar failure and rotation failure depending on the lateral pressure coefficient. Moreover, the increment of joint dip angle and joint persistency aggravates the rock mass failure around the opening. This study offers guideline on stability estimation of underground excavations.

关键词： failure behavior circular opening non-persistent joint PFC software package stress corrosion

Synthesis of Cobalt Containing Block Copolymers Via Ring opening Metathesis Polymerizastion (ROMP)

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Journal of Rare Earths 2004年第Z2期22卷 145-152页

作者： Bongjin Moon Minhyuk Kang Departmen of Chemistry Sogang UniversityShinsoo-Dong 1-1Mapo-GuSeoul121-742Korea Departmen of ChemistrySogang UniversityShinsoo-Dong 1-1Mapo-GuSeoul121-742Korea

In order to realize a metal containing nano-structure, a block-copolymer containing alkynyl groups in one block was designed and synthesized by living ring opening metathesis polymerization (ROMP) technique. The newly developed bis-3-bromopyridine complex of Grubbs catalyst was employed in the series of polymerization and it yielded the desired polymers with great molecular weight control and narrow polydispersities. The characteristics of the block copolymers were investigated by gel permeation chromatography, H- and 13H- NMR spectroscopy. Complexation of the alkynyl group containing block copolymers by treatment with dicobalt octacarbonyl occurred smoothly in 5 min at room temperature. GPC analysis before and after cobalt complexation indicated a significant increase of the hydrodynamic volume. AFM images of the films before and after the complexation also showed a noticeable change in its morphology where grain sizes become smaller and more regular upon complexation.

关键词： ring opening metathesis polymerization (ROMP) metal containing block copolymer polynorbornene derivative

Formulation of Reduction Rate for Ultimate Compressive Strength of Stiffened Panel Induced by opening

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China Ocean Engineering 2014年第4期28卷 557-568页

作者：于昌利 LEE Joo-sung School of Naval Architecture and Ocean Engineering Harbin Institute of Technology School of Naval Architecture and Ocean Engineering University of Ulsan

The main objective of this study is to numerically investigate the characteristics of ultimate compressive strength of stiffened panels with opening and also to fit the design-oriented formulae. For this purpose, three series of well executed experimental data on longitudinally stiffened steel plates with and without opening subjected to the uniform axial in-pane load which is carried out to study the buckling and post-buckling up to the final failure are chosen. Also, a nonlinear finite element method capable of efficiently analyzing the large elasto-plastic deflection behavior of stiffened panels is developed and used for simulation. The feasibility of the present simulation process is confirmed by a good agreement with the experimental results. More case studies are developed employing the simulation process to analyze the influence of various design variables on the reduction rate of ultimate strength of stiffened panel induced by opening. Based on the computed results, two design formulae are fitted and the accuracy of design formulae is studied. Furthermore, the viability of the design formulae for practical engineering is proved.

关键词： stiffened panel opening reduction rate non-linear analysis formulae fitting

Analytical solution for longitudinal deformation of shield tunnel induced by overcrossing tunnelling considering circumferential joints

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2355-2374页

作者： Zhiwei Zhang Rongzhu Liang Zhongchao Li Cheng Kang MHEl Naggar Mingzhao Xiao Wenbing Wu Faculty of Engineering China University of GeosciencesWuhan430074China Wuhan Municipal Construction Group Co. Ltd.Wuhan340023China Geotechnical Research Centre Faculty of EngineeringThe University of Western OntarioLondonONN6A 5B9Canada

This paper presents a new analytical solution for assessing the longitudinal deformation of shield tunnel associated with overcrossing tunnelling in consideration of circumferential joints.A simplified longitudinal beam-spring model(SLBSM)is established to model the longitudinal behaviours of shield tunnel,which can consider the opening and dislocation between segmental rings simultaneously.Then,the existing tunnel is treated as the SLBSM resting on the elastic foundation.The state equations including tunnel displacements and internal forces are constructed to solve the discontinuous deformation of circumferential joint-segmental ring.The feasibility of the proposed solution is verified through three well-documented cases.The predictions from the proposed method are also compared with other analytical methods.It is found that the proposed method can well capture the deformation of tunnel segmental rings and joints,where the rigid displacement mainly occurs in the segmental rings while the rotation and dislocation occur in the circumferential joints.Some dominant parameters are also analysed to explore the effects on existing tunnel deformation,including the rotation stiffness and shearing stiffness of joints,the skew angle and the clearance between new and old tunnels.

关键词： Overcrossing tunnelling Shield tunnel Circumferential joints Longitudinal beam-spring model(LBSM) opening Dislocation

Formula Revision of Natural Ventilation Driven by Hot Pressure in Single Large Window opening

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湖南大学学报（自然科学版） 2009年第S1期36卷 26-29页

作者： LIN Wen,ZHANG Quan,HOU Xi-kuai,LI Ping,ZHOU Jun-li,ZHANG Guo-qiang(Key Laboratory of Building Safety and Energy Efficiency(MOE),College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China) Key Laboratory of Building Safety and Energy Efficiency College of Civil Engineering Hunan University Changsha 410082 China

This paper investigated the natural ventilation driven by hot pressure on a typical office building with single window opening.The actual result indicates that the ventilation rate of natural ventilation driven by hot pressure in the actual single window opening construction is very different from that obtained by the theoretical formula,since the ventilation conditions between actual environment and ventilation driven by hot pressure in the single window opening are different.Therefore,the theoretical formula is amended,and it becomes more consistent with the actual ventilation rate of natural ventilation driven by hot pressure under conditions that the construction is in the form of single window opening.

关键词： single opening natural ventilation theoretical formula