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International journal of Digital Earth 2017年第12期10卷 1231-1252页

作者： Yinghui cao Bryan j.Boruff Ilona M.McNeill School of Earth and Environment The University of Western AustraliaCrawleyWAAustralia Melbourne School of Psychological Sciences The University of MelbourneParkvilleVICAustralia

Official warnings are essential for informing the public of impending hazards and promoting their responses before a disaster ***,research has identified that traditional public warnings,such as generic text messages based on large geographic regions,often fail to promote appropriate responses by at-risk ***,there has been an increased focus on using map-based approaches for communicating public ***,a systematic framework to guide the design of effective mapping instruments for this purpose is *** researchers sought to fill this gap by merging the scholarly understanding of factors influencing warning effectiveness with the contemporary spatial capacities of the emergency management *** current paper presents the conceptual framework resulting from this merger,which can be used to direct the design and implementation of map-based warnings that offer personalised risk visualisation and provide personalised decision support to motivate appropriate *** example is then provided to illustrate how this framework can be applied for the development of personalised bushfire warnings in an Australian *** by webgIS technologies,the proposed framework shows a potentially ground-breaking approach to improve public warning communication by fostering more efficient and effective risk personalisation and response related decision-making by individuals.

关键词： Public warning risk communication map gIS wildfire

SURFACE COMPOSITE gEAR AND PIPE MADE BY SEPARATED EUTECTIC TECHNOLOgY

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Acta Metallurgica Sinica(English Letters) 2000年第3期13卷 883-887页

作者： cao, Z.Q. Piao, L.Y. Zhang, X.g. Li, Z. jin, j.Z. Dalian Univ of Technology Dalian China

It is found that the anomalous eutectics can be separated on macroscopic scale by flow caused by electromagnetic stirring, and the separated phase is the leading faceted phase with the solution entropy over 23 j/(mol·K). By using this technology, a new kind of composite pipe and gear with good abrasive properties were made without adding any reinforced particles. Emphases were paid on the researches about formation mechanism of separated eutectic and abrasive property of the composite pipe or gear. The result shows that the entropy of solution controlling the eutectic microstructure is also valid and useful as a criterion of separated eutectic, and the kind and its chemical scope of the off-eutectic used to make composite can be calculated according to this theory.

关键词： Binary alloys Eutectics gears Microstructure Pipe Rotational flow Separators Solidification

Seasonal variations and sources of mass and chemical composition for PM_(10) aerosol in Hangzhou,China

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Particuology 2009年第3期7卷 161-168页

作者： junji cao Zhenxing Shen judith C. Chow guowei Qi john g. Watson State Key Lab of Loess and Quaternary geology - SKLLQg. Institute of Earth Environment ChineseAcademy of Sciences Xi'an. Shaanxi 710075 China Department of Environmental Science and Engineering. xi'an jiaotong University. Xi'an 710049. China Division of Atmospheric Sciences. Desert Research Institute. Reno. USA Hangzhou Municipal Environmental Monitoring Center Hangzhou 310007 China

Aerosol observation was conducted for four seasons from September 2001 to August 2002 at five sampling sites in Hangzhou, South China, on PM10 mass, 22 elements （Na, Mg, AI, Si, P, S, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, As. Se, Br, Cd, Ba, and Pb）, 5 major ions （F^-, Cl^ , NO3^-, SO4^2- , and NH4^＋）, and organic and elemental carbon （OC and EC）, showing that PM10 mass ranged from 46.7 to 270.8 μg/m^3, with an annual average of 119.2 μg/m^3. Na, AI, Si, S, K, Ca, and Fe were the most abundant elements in PM10, most of S being in the form of SO4^2- . SO4^2-, NO3^-, and NH4^＋ were the major ions, which contributed to about 20% of the PM10 mass. The mean seasonal concentrations for SO4^2- , averaged over all sites, were found to be 18.0, 18.5, 24,Z and 21.4 μg/m^3, for spring, summer, autumn, and winter, respectively, while the corresponding loadings for NO3^- were 7.2, 4.7, 7.1, and 11.2 μg/m^3, and for NH4^＋ were 6.0, 5.9, 8.2, and 9.3 μg/m^3, in the form mostly of NH4NO3 in spring, autumn, and winter, and mostly of （NH4）2SO4 in summer. The low NO3^-/SO4^2- ratio found indicates coal combustion as the major source throughout the year. The mean annual concentrations of OC and EC in PM10 were found to be 21.4, and 4.1 μg/m^3, respectively. Material balance calculation indicated that fugitive dust, the secondary aerosol, and carbonaceous matter were the most abundant species in PM10 for the four seasons, as is characteristic for cities in South China.

关键词： PM10 Elements lons Carbon Material balance

ELECTROCHEMICAL FEATURES DURINg PITTINg CORROSION OF LY12 ALUMINUM ALLOY IN DIFFERENT NEUTRAL SOLUTIONS

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Acta Metallurgica Sinica(English Letters) 2003年第4期16卷 319-326页

作者： Y.L.Cheng j.F.Li j.Q.Zhang C.N.cao F.H.cao Z.Zhanq DepartmentofChemistry YuquanCampusZhejiangUniversityHangzhou310027.China StateKeyLaboratoryforCorrosionandProtectionofMetals InstituteofMetalResearch.TheChineseAcademyofSciencesShenyang110016ChinaManuscriptreceived10July2002 inrevisedform10October2002

The electrochemical features of commercial airfrarne material, Al alloy LY12, in 0.349mol/L neutral sodium chloride (NaCl) and sodium sulfate (NazSO^) solutions were investigated by electrochemical impedance spectroscopy (EIS) and potentiody-namic polarization techniques. The microstructure of the as-tested samples was studied by scanning electron microscopy. The results show that the Nyquist plots of LY12 at different immersion time displayed different features, indicating that the Cl- ions elevate the corrosion rate and inhibit the repassivation of a metastable pit. It also shows that the corrosion product of LY12 formed in SO42- solution isn't easy to dissolve, and it will cover the surface of working electrode in the electrolyte. SEM images indicate that the corrosion apparent area and pit number of LY12 in NaCl solution are greater than that in Na2SO4 solution.

关键词： LY12 aluminum alloy pitting corrosion electrochemical impedance spectroscopy potentiodynamic polarization pit- morphology

Electromagnetic riveting technique and its applications

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Chinese journal of Aeronautics 2020年第1期33卷 5-15页

作者： Zengqiang cao Yangjie ZUO School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China School of Aeronautics and Astronautics Sichuan UniversityChengdu 610065China

With the increasing applications of novel materials and structures in new-generation aircraft,conventional joining techniques in aircraft component assembly are greatly *** meet those challenges,the electromagnetic riveting(EMR)technique was developed as an advanced joining tool,which exhibits obvious advantages in the assembly of new-generation *** this paper,the riveting principle of EMR was analyzed,and its development history and status were presented in ***,equipment features of three typical EMR systems were ***,three important applications of EMR were covered,i.e.,composite structure riveting,titanium rivet and large-size aluminum rivet riveting,and interference fit bolt ***,a novel strengthening method for mechanical linking holes based on EMR was also presented,which can significantly improve the fatigue behaviors of mechanical ***,open questions in the EMR field were discussed,and some recommendations for future work were also *** paper can be useful for optimizing the joint designs of aircraft components and improving the level of aircraft maintenance.

关键词： Composite Electromagnetic riveting Hole strengthening Interference fit Titanium alloys

Weak rigid monoidal category

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Frontiers of Mathematics in China 2017年第1期12卷 19-33页

作者： Haijun cao School of Science Shandong Jiaotong University Jinan 250375 China

We define the right regular dual of an object X in a monoidal category l, and give several results regarding the weak rigid monoidal category. Based on the definition of the right regular dual, we construct a weak Hopf algebra structure of H = End（F） whenever （F, j） is a fiber functor from category l to Vec and every X ∈ l has a right regular dual. To conclude, we give a weak reconstruction theorem for a kind of weak Hopf algebra.

关键词： Semilattice graded weak Hopf algebra regular right dual weak rigid monoidal category

Support technology of deep roadway under high stress and its application

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International journal of Mining Science and Technology 2016年第5期26卷 787-793页

作者： cao Rihong cao Ping Lin Hang School of Resources and Safety Engineering Central South University Changsha 410083 China State Key Laboratory of Coal Resources and Safety Mining School of Mines China University of Mining ＆ Technology Xuzhou 221116 China

Roadway instability has been a major concern in the fields of mining engineering. This paper aims to provide practical and efficient strategy to support the roadways under high in-situ stress. A case study on the stability of deep roadways was carried out in an underground mine in gansu province, China. Currently,the surrounding rock strata is extremely fractured, which results in a series of engineering disasters, such as side wall collapse and severe floor heave in the past decades. Aiming to solve these problems, an improved support method was proposed, which includes optimal bolt parameters and arrangement, floor beam layout by grooving, and full length grouting. Based on the modeling results by FLAC3D, the new support method is much better than the current one in terms of preventing the large deformation of surrounding rock and restricting the development of plastic zones. For implementation and verification, field experiments, along with deformation monitoring, were conducted in the 958 level roadway of Mining II areas. The results show that the improved support can significantly reduce surrounding rock deformation, avoid frequent repair, and maintain the long-term stability of the roadway. Compared to the original support, the new support method can greatly save investment of mines, and has good application value and popularization value.

关键词： Deep roadway Floor heave High stress Support Steel beam

Review of Antiswing Control of Shipboard Cranes

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IEEE/CAA journal of Automatica Sinica 2020年第2期7卷 346-354页

作者： Yuchi cao Tieshan Li Navigation College Dalian Maritime University

Shipboard cranes are extensively utilized in numerous fields such as cargo transferring and offshore *** control of shipboard cranes,especially the antiswing control of payloads,has attracted much research attention due to their typical underactuation characteristics and complicated *** comparisons of the traditional land-fixed cranes,a brief review on modeling and dynamics analysis is presented to illustrate the tremendous challenges and difficulties in controller design for shipboard cranes.A comprehensive review and brief analysis of shipboard crane control strategies are further *** future research directions are also put forward for *** is expected that the paper will be useful for improving existing control schemes and generating novel control approaches for shipboard crane systems.

关键词： Control review shipboard crane underactuated system

Reliability-based design of lining structures for underground space against water seepage

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Underground Space 2021年第3期6卷 290-299页

作者： cao Wang Department of Civil Engineering Monash UniversityClaytonVIC 3800Australia School of Civil Engineering The University of SydneySydneyNSW 2006Australia

The use of underground spaces is becoming increasingly important in this era of rapid urbanization and population ***,underground spaces are susceptible to water ingress,which may trigger the deterioration of their structural performance and reduce their *** highlights the importance of the proper design of lining structures with an emphasis on water *** study develops a reliability-based approach to guide the design of lining structures used for underground *** equivalent depth of water seepage is considered for a two-dimensional lining structure in the presence of the randomness and spatial correlation of the water seepage *** probabilistic behavior of the equivalent seepage depth that is derived serves as the basis for reliability-based design of lining structures.A simple design criterion is *** example is presented to demonstrate the applicability of the proposed approach.

关键词： Reliability-based design Spatial correlation Underground space Lining structure Water penetration Serviceability

Numerical interpretation of transient permeability test in tight rock

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journal of Rock Mechanics and geotechnical Engineering 2018年第1期10卷 32-41页

作者： Chong cao Department of Civil Engineering and Applied Mechanics McGill University

Pulse-decay method has been widely used to estimate the fluid transport properties of low-permeability geomaterials. In this context, radial flow transient pulse test is conducted to measure the water permeability of Cobourg limestone hollow cylinder. The proposed method applies hydraulic pulses to the sealed central cavity and then the cavity pressure dissipates as the fluid migrates into the saturated rock matrix. The influence of entrapped air bubbles within the pressurized cavity is crucial to interpreting permeability from transient pulse test. The modeling results indicate that the air inclusions can significantly increase the fluid compressibility and thus delay the hydraulic pulse decay process, which may lead to the underestimation of the rock permeability.

关键词： Pulse-decay method Low-permeability Air-water mixture Compressibility