辽西河道堤防护坡方法分析

从护坡措施的基本理论出发确立防护措施的关键问题,结合阜新地区建设和管理的实践经验,归纳出3个方面,6种措施。     

Robustness analysis of responses of vibration control structures with uncertain parameters using interval algorithm

Variations in system parameters due to uncertainties may result in system performance deterioration. Uncertainties in modeling of structures are often considered to ensure that control system is robust with respect to response errors. Hence, the uncertain concept plays an important role in vibration control of the engineering structures. The paper discusses the robustness of responses of vibration control systems with the uncertain parameters. The vibration control problem of an uncertain system is approximated by a deterministic one. The uncertain parameters are described by interval variables. The uncertain state matrix is constructed directly using system physical parameters and avoided to use bounds in Euclidean norm. The feedback gain matrix is determined based on the deterministic systems, and then it is applied to the actual uncertain systems. A method to calculate the upper and lower bounds of responses of the closed-loop system with uncertain parameters is presented. The upper bounds of responses can be used to estimate the robustness of responses of the controlled system with uncertain parameters. Two numerical examples are given to illustrate the applications of the present approach.     

石化装置检修的安全管理

针对石化装置的检修特点,阐述装置检修的安全管理和技术工作,对检修时的高风险作业提出明确的要求和注意事项.     

Pattern search algorithms for nonlinear inversion of high-frequency Rayleigh-wave dispersion curves

Inversion of Rayleigh wave dispersion curves is challenging for most local-search methods due to its high nonlinearity and to its multimodality. In this paper, we implemented and tested a Rayleigh wave dispersion curve inversion scheme based on GPS Positive Basis 2N, a commonly used pattern search algorithm. Incorporating complete poll and complete search strategies based on GPS Positive Basis 2N into the inverse procedure greatly enhances the performance of pattern search algorithms because the two steps can effectively locate the promising areas in the solution space containing the global minima and significantly reduce the computation cost, respectively.The proposed inverse procedure was applied to nonlinear inversion of fundamental-mode Rayleigh wave dispersion curves for a near-surface shear (S)-wave velocity profile. The calculation efficiency and stability of the inversion scheme are tested on three synthetic models and a real example from a roadbed survey in Henan, China. Effects of the number of data points, the reduction of the frequency range of the considered dispersion curve, errors in P-wave velocities and density, the initial S-wave velocity profile as well as the number of layers and their thicknesses on inversion results are also investigated in the present study to further evaluate the performance of the proposed approach.Results demonstrate that pattern search algorithms applied to nonlinear inversion of high-frequency surface wave data should be considered good not only in terms of accuracy but also in terms of the computation effort due to their global and deterministic search process.     

Fabrication of Functional Nanofibrous Ammonia Sensor

A nanofibrous sensor for ammonia gas is fabricated by electrospinning the composite of poly(diphenylamine) (PDPA) with poly(methyl methacrylate) (PMMA) onto the patterned interdigit electrode. The composite electrospun membrane shows interconnected fibrous morphology. Functional groups in PDPA and the high active surface area of the fibrous membrane make the device detect a lower concentration of ammonia with a good reproducibility. The sensing capability of the device is studied by monitoring the changes in resistance of the membrane with different concentrations of ammonia. The changes in resistance of the membrane shows linearity with the concentration of ammonia in the limit of 10 and 300 ppm. UV-visible spectroscopy reveals the mechanism of sensing ammonia by the membrane.     

减四线馏分油的热容测定及热力学性质研究

测试了减四线馏分油低温热容 ,并进行了热重 /微分热重 (TG/DTG)和差示扫描量热 (DSC)分析。在 80～ 373K温区 ,用高精度全自动绝热量热仪测定了热容值 ,用最小二乘法对实验测量值进行拟合 ,建立了热容随温度变化的多项式方程。从减四线馏分油的热容曲线 ,发现该样品从固相变为液相 ,存在着两个熔化峰 ,分别为 2 94 .17K和 331.5 7K ,后者为熔化主峰。以此为熔点 ,计算出熔化焓、熔化熵分别为 88.19J/g和0 .2 6 6 0J/ (K·g)。从TG/DTG分析曲线发现该油样在 5 73K开始失重 ,到 6 6 3K失重速度达到最大 ,可能是由于样品蒸发引起。从DSC分析曲线 ,发现样品除 333K附近出现熔化吸热峰外 ,在 5 73K到 873K范围还出现一系列吸热峰 ,可能与样品的蒸发和热分解有关。     

Palogue油田复合油藏动态响应及特征描述

以简单的复合油藏模型理论和方法为基础,以Palogue油田的实际测试井为例,介绍了复合油藏模型的试井动态识别与模型拟合,及与地质静态资料相结合的油藏综合描述过程.该描述方法将会对实际试井解释和油藏综合描述工作有所借鉴和帮助.     

套管钻井用套管外表面磨损后剩余强度分析

在分析讨论套管钻井管柱磨损形态的基础上,结合API5C5实物试验尺寸要求,通过有限元计算分析方法,对钻井套管完钻后含有外表面磨损缺陷的套管柱的极限剩余抗挤强度和极限剩余抗拉强度进行了研究,分别获得了均匀磨损和偏磨条件下,套管钻井套管柱外表面磨损缺陷的临界长度尺寸数值,以及不同破坏失效准则条件下的剩余抗挤强度和剩余抗拉强度的计算方程,为套管钻井中套管柱的设计、计算奠定了理论基础。     

特低渗透油气藏成岩储集相的定量评价方法

针对陕北斜坡东部特低渗透储层受沉积作用和成岩作用两大因素控制的特点，利用灰色系统理论对成岩储集相进行了研究。分析了成岩作用综合效应及其相应的视压实率、视肢结率、视微孔率、成岩综合系数等定量指标和岩心分析数据，建立了成岩储集相综合评价参数、指标和分析方法。通过在安塞油田低孔隙度特低渗透长6。油藏储层的实际应用，对目的层段开展了Ⅰ，Ⅱ，Ⅲ和Ⅳ类成岩储集相的定量评价和油气富集描述，有机地集成和综合了多种信息，实现了成岩储集相对沉积学、岩石学和成岩作用等特征的综合表征，并划分出有利成岩储集相区域，为指导油田有利含油区块的筛选和开发决策提供了重要依据。