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Effect of vehicle weight on natural frequencies of bridges measured from traffic-induced vibration

Earthquake eng.neering and eng.neering Vibration 2003年第1期2卷 109-116页

作者： Chul-Young Kim Dae-Sung Jung Nam-Sik Kim Soon-Duck Kwon Maria Q.Feng dept.of civil & Envir.eng. Myongji UniversityKorea Professor dept.of civil & Envir.eng. Myongji UniversityKorea Research Associate Hyundai Institute of Construction Technology Hyundai E&C Co.Ltd.Korea Chief Researcher dept.of civil eng.neering Chonbuk National UniversityKorea Professor dept.of civil & Envir.eng. University of CaliforniaIrvineCaliforniaUSA Professor

Recently,ambient vibration test(AVT)is widely used tu estimate dynamic characteristics of large civil struc- *** characteristics ean be affected by various envirnnmental factors such as humidity,intensity of wind,and *** these environmental conditions,tire mass of vehicles may change the measured valnes when traffic-in- duced vibration is used as a source of AVT tor *** effect of vehicle mass on dynamic characteristics is investigated through traffic-induced vibration tests on three bridges;(1)three-span suspension bridge(128m+404m+128m),(2) five-span continuous steel box girder bridge(59m+3@ 95m+59m),(3)simply supported plate girder bridge(46m). Acceleration histories of each measurement location under normal traffic are recorded for 30 minutes at *** recor- ded histories are divided into individual vibrations and are combined into two groups aceording to the level of vibration;one by heavy vehicles such as trucks and buses and the other by light vehicles such as passeng.r *** processing of the two groups of signals shows that,for the middle and long-span bridges,the difference can be hardly detected,but,for the short span bridges whose mass is relatively small,the measured natural frequencies can change up to 5.4%.

关键词： ambient vibration test traffic induced vibration vehicle mass suspension bridge short-span bridge dynamic characteristics natural frequency

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A General Attribute and Rule Based Role-Based Access Control Model

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Journal of Shanghai Jiaotong university(Science) 2007年第6期12卷 719-724页

作者：朱一群李建华张全海 dept. of Electronic eng. Shanghai Jiaotong Univ.

Growing numbers of users and many access control policies which involve many different resource attributes in service-oriented environments bring various problems in protecting *** paper analyzes the relationships of resource attributes to user attributes in all policies, and propose a general attribute and rule based role-based access control(GAR-RBAC) model to meet the security needs. The model can dynamically assign users to roles via rules to meet the need of growing numbers of users. These rules use different attribute expression and permission as a part of authorization constraints, and are defined by analyzing relations of resource attributes to user attributes in many access policies that are defined by the enterprise. The model is a general access control model, and can support many access control policies, and also can be used to wider application for service. The paper also describes how to use the GAR-RBAC model in Web service environments.

关键词： attribute rule user-role assignment role-based access control(RBAC) access policy

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Antiplane SH-deformations near a surface rigid foundation above a subsurface rigid circular tunnel

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Earthquake eng.neering and eng.neering Vibration 2002年第1期1卷 27-35页

作者： V.W.Lee M.E.Manoogian S.Chen civil & Envir.eng.dept. Univ.of Southern CaliforniaLos AngelesCaliforniaU.S.A.Associate Professor civil eng.& Envir:Sci.dept. Loyola Marymount Univ.Los AngelesCaliforniaU.S.A.Associate Professor civil & Envir.eng.dept. Univ.of Southern CaliforniaLos AngelesCaliforniaU.S.A. Research Associate

The problem on the dynamic response of a rigid embedded foundation in the presence of an underground rigid tunnel and subjected to excitation of incident anti-plane SH waves is *** using the exact analytical solution for the two-dimensional SH-wave propagation in and around both the surface rigid foundation and subsurface rigid tunnel,those aspects of the resulting ground motions that are of special interest and importance for seismic resistant design in earthquake analyses have been *** computed amplitudes of the resulting periodic ground motions display a very complicated wave-interference between the surface foundation and underground tunnel that lead to observed standing wave patterns, together with abrupt changes in the wave amplitudes and large amplification of the incident motions.

关键词： SH waves wave-interference embedded foundation underground tunnel analytical solution

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resource Partitioning and Routing Optimization in Relay Enhanced Cellular Network

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Journal of Shanghai Jiaotong university(Science) 2007年第4期12卷 486-491页

作者：刘涛戎蒙恬史宏逵薛义生 dept.of Electronic eng. Shanghai Jiaotong Univ. Siemens Ltd.China Corporate TechnologyRadio Communications

A joint routing and resource partitioning scheme were proposed to improve cell capacity and user throughput of cellular network enhanced with two-hop fixed relay nodes (FRNs). Radio resources are partitioned under a reuse partitioning based framework, which guarantees effective and efficient inter-cell interference management. At the same time, each mobile terminal was assigned a channel-dependent route by the routing controller, which tries to maximize the cell capacity under the constraint imposed by reuse partitioning. Intensive computer simulations demonstrate the performance superiority of the FRN enhanced cellular network employing this scheme in comparison with conventional network, as well as the validity of the channel-dependent routing mechanism.

关键词： resource partitioning routing relay enhanced cellular network

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Settling basin design in a constructed wetland using TSS removal efficiency and hydraulic retention time

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Journal of Environmental Sciences 2014年第9期26卷 1791-1796页

作者： Soyoung Lee Marla C.Maniquiz-Redillas Lee-Hyung Kim Water Environment Research dept. National Institute of Environmental ResearchHwangyeong-ro 42Seo-guIncheon 404-708Korea dept.of civil & Envi.eng.g. Kongju National University275 BudaedongSeobukguCheonanChungnamdo 331-717Korea

Using total suspended solid （TSS） removal efficiency and hydraulic retention time （HRT） as design parameters a design guideline of a settling basin in a constructed wetland （CW） was suggested; as well as management of sediment and particle in the settling basin. The CW was desiEned to treat the piggery wastewater effluent from a wastewater treatment plant during dry days and stonnwater runoff from the surrounding paved area during wet days. The first settling basin （FSB） in the CVV was theoretically designed with a total storage volume （TSV） of 453 ms and HRT of 5.5 hr. The amount of sediment and particles settled at the FSB was high due to the sedimentation and interception of plants in the CVV. Dredging of sediments was performed when the retention rate at the FSB decreased to approximately 80%. Findings showed that the mean flow rate was 21.8 m3/hr less than the designed flow rate of 82.8 m3/hr indicating that the FSB was oversize and operated with longer HRT （20.7 hr） compared to the design HRT. An empirical model to estimate the leng.h of the settling basin in the CW was developed as a function of HRT and desired TSS removal efficiency. Using the minimum tolerable TSS removal efficiency of 30%, the leng.h of the FSB was estimated to be 31.2 m with 11.8 hr HRT.

关键词： Constructed wetlandHydraulic retention timeParticle size distributionSettling basin designTSS removal efficiency

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Study on the characteristics of ground pressure behaviors in working face with great mining height at different advance speeds by similarity model experiment

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Journal of Coal Science & eng.neering(China) 2007年第1期13卷 28-31页

作者：华心祝张金龙谢广祥 dept. of resource Exploitation and Management Anhui University of Science and Technology Huainan 232001 China College of civil eng.neering Hohai University Nanjing 210098 China

Presently most of research results on strata behaviors were concluded under the normal （moderate） advance rate conditions. Comparing with normal advance rate, fast advance rate and slow advance rate may cause some new changes of strata behaviors. The characteristics of ground pressure behaviors in working face with great mining height at different forward speeds were studied by similarity model experiment in laboratory. Its conclusion provides a theoretic basis for ground pressure controlling.

关键词： similarity simulation advance rate working face with great mining height ground pressure

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RESEARCH ON BUILT ENVIRONMENT FORM IN CITY AND TOWN

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Journal of Shanghai Jiaotong university(Science) 2001年第1期6卷 113-116页

作者：孙洪刚 dept. of civil eng Shanghai Jiaotong Univ.

Aimed at the fading environment characteristics with globalization, this paper provided a new solution based on the conclusion of practical survey. The following steps are emphasized in the new methods:① the idea of ... 详细信息

关键词： rehabilitation quantitative analysis mixed development

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Data Migration for Ontology Evolution

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Journal of Shanghai Jiaotong university(Science) 2004年第4期9卷 1-6页

作者：赵彦张雷林晨曦张卓俞勇 dept. of Computer Science and eng. Shanghai Jiaotong Univ. Shanghai 200030 China

Ontology is the conceptual backbone that provides meaning to data on the semantic web. However, ontology is not a static resource and may evolve over time, which often leaves the meaning of data in an undefined or inconsistent state. It is thus very important to have a method to preserve the data and its meaning when ontology changes. This paper proposed a general method that solves the problem using data migration. It analyzed some of the issues in the method including separation of ontology and data, migration specification, migration result and migration algorithm. The paper also instantiates the general mothod in RDF(S) as an example. The RDF(S) example itself is a simple but complete method for migrating RDF data when RDFS ontology changes.

关键词： data migration ontology semantic web

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Considerations in thermal behavior of rock mass around openings due to storage of heated water

Considerations in thermal behavior of rock mass around openi...

引用

The 2001 ISRM International Symposium-2nd Asian Rock Mechanics Symposium(ISRM 2001-2nd ARMS)

作者： Y.INADA N.KINOSHITA dept.of civil ＆ Environmental eng. Ehime UniversityJapan

＜正＞The authors have proposed and discussed temporary storage of heated water in openings excavated in rock mountains. Heated water,produced by surplus heat from garbage burning plants,should be used for many purposes such as district heating,heated water supply,green houses,*** this case,the rock mass around openings will receive the affect of thermal hysteresis of high temperatures as the storage quantity of heated water continually changes according to its *** this study,streng.h and deformation characteristics of some types of rocks were examined after receiving thermal hysteresis of high *** effects of the amount of thermal hysteresis,atmospheric temperature,porosity,*** streng.h and deformation characteristics of rocks were discussed. The results of the tests mentioned above were used for analyzing temperature and stress distribution around openings by using the Finite Divided Element Method and *** the effect of thermal hysteresis of high temperatures on thermal behavior of some types of rock mass around openings was discussed.

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纳米碳纤维自密实混凝土的电阻特性

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四川大学学报（工程科学版） 2011年第5期43卷 52-58页

作者：高迪彭立敏莫诒隆中南大学土木建筑学院 dept.of civil and Environmental eng. Univ.of HoustonHoustonTexas 77004USA

为了探讨纳米碳纤维自密实混凝土的导电特性及功能化的可行性,对其静态电阻进行了观测。在此基础上,测量纳米碳纤维自密实混凝土试件在单轴抗压试验、劈裂试验和抗弯试验中的实时电阻变化,分析讨论了在受力(拉压)情况下试件的电阻变化... 详细信息

为了探讨纳米碳纤维自密实混凝土的导电特性及功能化的可行性,对其静态电阻进行了观测。在此基础上,测量纳米碳纤维自密实混凝土试件在单轴抗压试验、劈裂试验和抗弯试验中的实时电阻变化,分析讨论了在受力(拉压)情况下试件的电阻变化规律。试验结果表明,掺量适当的纳米碳纤维自密实混凝土的电阻率在半导体范围之内;在受拉、压作用时电阻变化率与应力(应变)具有良好的线性关系,其作为一种新型智能混凝土材料是非常具有潜力的。

关键词：纳米碳纤维混凝土电阻电阻测量

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