论输油站及阀室防雷装置检测

输油站防雷检测主要包括站控室检测、金属储罐与罐前阀室检测、输油泵房与阀组间检测、输油管道检测、生活区与办公区检测等。而输油站外阀室的检测主要包括阀室检测、发电机组检测与太阳能设备检测等。该文简要介绍了各类基础装置防雷检测的基本流程与方法,旨在为业内人士提供有价值的参考意见。     

桥梁检测新技术

本文介绍了桥梁检测的工作内容、测试仪器及方法、国内外桥梁检测技术的现状与发展,着重论述了桥梁检测新技术中的光纤传感技术,及其检测原理和在国内外桥梁检测中的研究与应用,并指出了桥梁检测中光纤传感技术的发展方向,最后介绍了桥梁损伤识别与无损检测的新方法。     

基于C8051F020多通道食品安全速测仪设计

为能快速筛选出市场上有害食品,本文研发了一种基于C8051F020单片机的多通道食品安全速测仪.采用定波长光源替代分光方法,与固化在仪器中的标准曲线比对,从而实现各检测项的定量与定性检测.系统成功实现了在线滤波、有线与无线的数据传输、检测数据及相关检测信息的打印等功能.检测结果表明,该仪器检测精度较高、响应快,各个检测项在检测范围内,RSD<2.5%,检测分析时间不超过5s.     

汽车伞齿轮多目视觉检测系统与算法

针对人工检测汽车伞齿轮表面缺陷与尺寸参数存在成本高、工作量大、检测速度慢且产品一致性差等问题,利用机器视觉技术进行研究,开发了一种集缺陷检测和尺寸测量于一体的伞齿轮多目视觉检测装置。通过构建的邻域均差缺陷提取、圆逼近和快速旋转定位3种高效图像处理算法,解决了伞齿轮齿面多、外形结构复杂、缺陷种类多样等复杂条件下的齿轮缺陷与尺寸检测难题。可检测缺陷包括磕碰伤、裂纹、充填不满、划痕、凹陷与凸起、麻点、花键重复拉削等,可检测最小缺陷尺寸为0.4mm×0.4mm,测量精度为40~50μm,单次检测耗时小于1.3s,检测精度与速度均满足伞齿轮高速自动化生产线的实时在线检测需求。     

基于子空间分解的线性多用户检测算法及其泛散度

讨论了基于子空间分解线性多用户检测算法的原理,重点对解相关检测算法、最小均方误差检测算法、最小输出能量检测算法的基于子空间分解的检测算子的形式、性能进行了讨论.定义了一个称谓"泛散度"的量,来量度基于子空间分解的检测算子与传统检测算子的拟合距离,这个泛散度不但与数据长度有关,而且特别与在线用户的功率强度及分散度有关.笔者还对理论分析的结果进行了计算机模拟,实验结果与理论分析结果吻合.     

旋转构件动态参数的在线检测技术

基于电磁检测原理,研究了一种用磁晶格法动态检测旋转构件的角速度、剪应变、剪应力、扭矩及轴功率等动态物理参数的新的检测技术与方法。阐明该检测方法的原理及检测信号的处理与转换技术,推导出时间域的检测量与旋转构件动参数之间的数学关系式;并用单片机实现了旋转构件动态物理参数的实时在线定量检测。     

基于应力波的锚杆锚固质量无损检测研究进展

施工工艺、材料特性、环境与荷载长期耦合作用等因素导致岩土体中锚杆锚固结构产生锚固缺陷,对工程安全构成潜在威胁。对在役锚杆锚固结构开展无损检测是进行锚固质量评估、锚杆质量补强的重要环节。应力波法适应强、发展快,是锚杆锚固质量无损检测技术采用的主要方法。从基于应力波法的锚杆锚固质量无损检测理论、室内模型试验、应力波激振与接收、信号处理与分析、数值模拟方面对国内外锚杆锚固质量无损检测技术研究现状进行了综述。研究表明：中国锚杆锚固质量无损检测技术研究起步晚,但发展迅速;现有锚杆锚固质量无损检测技术较为成熟,可实现黏结型锚杆杆体长度及灌浆密实度检测,但其中仍存在不足,限制了锚杆检测精度与检测长度;针对老旧锚杆服役状态的无损检测方法也较少报道,仍需开展研究。最后结合未来发展趋势对未来可能发展的方向进行了展望,后续研究中,应进一步改进与完善现有理论,研发与升级无损检测技术与设备,拓展锚杆锚固质量无损检测技术适用范围。同时,应构建基于无损检测技术的锚杆服役状态智能评价体系并提出锚杆剩余寿命预测方法。     

入侵检测系统的研究综述

入侵检测系统是网络系统重要的安全保障之一。 为明确入侵检测系统的研究方向, 总结了入侵检测系统的研究现状, 包括概念、 模型、 发展历史及分类, 分析了目前入侵检测的主要技术。 结果表明, 开发具有灵活分配角色机制的协作智能入侵检测系统, 将其他安全技术与入侵检测技术集成、 将计算机取证与入侵检测融合, 研究面向应用层和面向 IPv6 的入侵检测系统将成为该领域的发展趋势。     

面向科研机构的数字化试验检测管理系统的研究与设计

简要介绍了试验检测管理系统的建设意义和目标,提出了数字化试验检测管理系统（TDM）的解决方案。通过构建试验检测管理系统、电子智能看板系统、试验检测管理系统与其他应用系统的集成及与试验检测设备的集成,解决了试验检测业务中涉及的各方面要素的一体化管理问题,有效提高试验检测管理的业务水平。     

无损检测在三峡大坝混凝土质量检查中的应用

无损检测技术是一种新型的混凝土质量检测方法,与传统钻孔检查方式相比,具有快速、准确、费用低等特点.在三峡工程泄洪坝混凝土质量检查中,首次大规模采用了无损检测技术,在检测出的缺陷区域内,通过灌浆孔检查资料与无损检测成果验证分析表明,无损检测技术能有效地查清混凝土缺陷性状及范围,说明混凝土无损检测技术是检测大体积混凝土质量的有效方法,可作为混凝土质量检测的一种手段.     

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.     

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.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the