谈大跨度桥梁结构的健康监测

本文阐述了大跨度桥梁结构健康监测的必要性,介绍了国内外桥梁结构健康监测技术的研究与应用现状,指出了健康监测的概念系统的组成以及主要监测内容,分析了桥梁结构健康监测技术的不足和发展趋势。     

无线通信在结构健康监测系统的应用研究综述

高速率、强稳定性的通信技术是保障结构健康监测系统数据传输有效和可靠的基础,近些年无线通信技术凭借组网灵活、成本低廉、运维简单的优势广泛应用于结构健康监测系统中。在对结构健康监测系统组成和功能分析的基础上,结合常见的无线通信技术的原理技术特点,着重分析了ZigBee、WiFi、4G/5G、LoRa和NB-IoT 5种典型无线通信技术在结构健康监测系统中的应用,并探讨了目前无线通信技术在应用中面临的挑战和未来的研究方向,为无线通信技术在结构监测中的推广应用提供了一定的技术参考。     

桥梁健康监测系统概念设计

针对目前国内外桥梁健康监测系统的研究现状,深入总结和思考了目前桥梁健康监测研究存在的问题并且从概念意义上指出了诸如桥梁安全预警和桥梁损伤识别等关键问题可能的解决思路.根据桥梁不同状况及经济因素,梳理了三个等级的桥梁健康监测系统的框架,给出了每一等级健康监测系统设计的方法和应用条件.最后,初步探讨了桥梁健康监测系统设计的准则和设计步骤.取得的研究成果为桥梁健康监测系统的实用化研究提供了参考.     

桥梁振动远程监测系统的研究

桥梁振动监测是桥梁健康监测的重要内容,桥梁的振动状态是反映桥梁健康状况的重要参数。本文采用先进的传感监测技术和远程通信技术,开发了基于虚拟仪器的桥梁振动远程监测与预报系统,为桥梁结构健康监测系统的进一步发展应用提供更加丰富的理论成果。     

光纤光栅传感器在土木工程结构健康监测中的应用

在土木工程领域，光纤智能检测方法是结构健康监测中一种新的方法。本文首先系统阐述了光纤光栅传感器的独特优点，然后，对光纤光栅传感器的结构和工作原理进行详细介绍,回顾了目前光纤光栅传感器在国际上和国内用于健康监测研究和应用的现状，及其光纤健康监测系统的构成、信号处理、安装等方面问题；最后，展望了光纤光栅传感器在结构健康监测领域中的前景。     

光纤光栅传感器及其在结构健康监测中的应用

依据结构健康监测的基本概念,阐述了光纤光栅的构造和传感原理,列举了采用光纤光栅封装传感器的三种工艺,介绍光纤光栅传感网络系统原理以及光纤光栅传感器发展历程和在健康监测中的应用。     

基于云平台的智能健康监测系统及应用

设计了一种基于云平台的智能健康监测系统,实现人体体征参数的检测、监护和健康干预,为慢性病防治和不良生活习惯纠正提供了积极有效的解决途径。系统以"智能感知终端+数据处理中转站+健康云平台+多模态应用终端"为架构,基于云计算和传感器技术,设计了数据处理前端(含健康监测传感器集群阵列、数据处理中转站)、云平台数据分析存储单元和客户应用终端三个部分。通过监测血压、血氧、体温、心电、血常规、尿常规等体征参数,运用云平台成熟的数据传输技术、强大的数据计算能力以及实时动态更新的云端数据分析算法,完成数据的分析计算、异地存储、同步显示、多元分发和远程推送功能。该系统监测参数多、精度高,可实现数据的远程传输、处理和展示,有助于建立健康监测新模式。     

适用于遗产建筑的结构健康监测系统

遗产建筑具有极其宝贵的历史、文化、艺术和科学研究价值,结构安全是保证其价值存在的重要基础.结构健康监测系统目前广泛应用于土木工程的重大或复杂结构,以辅助对结构安全状况进行判断.文中分析了适用于遗产建筑的结构健康监测系统的构架、基本技术及国内外应用情况.通过在某藏式古建筑上的监测试验,验证了遗产建筑的结构健康监测系统,并对其在遗产建筑上应用的特殊性及存在的问题进行了讨论.     

基于无线传感器网络的结构健康监测系统远程工作站软件设计

该文基于无线传感器网络的结构健康监测系统远程工作站软件的设计与开发,实现传感器数据在工作站中的存储、显示、分析和查询等,满足了无线传感器网络在结构健康监测系统中的应用,具有较高的实用价值。     

城市高架桥健康监测方案设计

高架桥作为解决交通拥堵的一个方法在城市道路桥梁建设中应用越来越多,其安全性已经引起人们重视。而国内专门针对城市高架桥的健康监测研究还比较少,通过本方案以达到对城市高架桥健康监测的作用。结合工程项目对高架桥结构进行健康监测方案设计,首先对健康监测系统的总体构架进行了设计,具体分析了高架桥结构特点及传感器布设要求,对高架桥不同结构进行传感器布设,最后指出高架桥结构健康监测需要考虑的一些问题,对城市高架桥健康监测做了初步探讨。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-