巨厚强非均质性砂岩储层酸化技术

以最大程度解堵、最小程度对岩心破坏、最优化酸液置放为目标对巨厚强非均质性砂岩储层酸液体系和酸化工艺进行了探索。采用钻井液伤害实验与酸化解堵实验相结合、长岩心实验与短岩心实验相结合,宏观测试与微观分析相结合的思路。进行研究结果表明,对于泥质含量高、胶结疏松的储层可适当增加前置酸浓度(HCl浓度增加到15%),同时降低主体酸HF浓度(降低到1%)。岩心切片结合电镜扫描分析确定伤害深度和解堵半径,为用酸规模优化提供依据。对于巨厚的孔隙型储层,可以通过封隔器分隔+变密度射孔+转向酸的组合模式实现储层均匀改造,而对于裂缝发育段应该坚持"大排量、大液量、高泵压"的改造模式以实现储层深度解堵。     

基于数值模拟的厚板精冲挤压过程分析

针对厚板精密冲裁过程存在的缺陷(塌角与毛刺等),基于Deformed2D分析了10mm厚钢板精密冲裁过程中双齿V形压料板对冲裁质量的影响.采用V形压料板可在一定程度上减小塌角的高度,但不能完全消除.随后采用精冲挤压方法对这一厚板的成形过程进行了分析,结果表明:采用精冲挤压成形工艺后,厚板零件表面塌角得到了完全消除,零件...     

Experimental investigation on the effect of top electrode diameter in PZT thick films

We report the effect of top electrode diameter size in aerosol deposited Pb(Zr_0.52Ti_0.48)O₃ thick films (~ 10 μm-thick) with Pt top and bottom electrode. Dielectric and ferroelectric results showed that top electrode diameter of 0.5-1 mm provides reasonable performance with 1 mm being the most suitable dimension in wide range of AC electric field and frequency. The results were discussed based on the surface microstructure and Debye relaxation. The dielectric analysis showed that the properties variation was mainly due to average grain size and defect density. Debye relaxation modeling exhibited that the result is because of materials characteristic not measurement artifact. We believe the results of this study will find immediate application in design of aerosol deposition process.     

Investigation into real-time pressure sensing properties of SnO2, TiO2, and TiO2/ZnO thick films with interdigitated electrodes

The pressure sensing properties of nanocomposite SnO₂, TiO₂, and TiO₂/ZnO thick film capacitors with interdigitated electrodes are investigated. To form the dielectric layers, the metal oxides powders were respectively mixed with isopropanol, wet ball milled for 24 h, then the mixtures were dried at 120 °C and further the powders were placed under 2 tonnes of pressure to form pellets, which were fired at 1250 °C (rate of 5 °C/min) in a vacuum of 6 × 10⁻³ mbar for 5 h, followed by cooling (rate of 3 °C/min). After firing, the resultant nanopowders were mixed with 7 wt.% of polyvinyl butyral (binder) and suitable amount of ethylenglycolmonobutylether (solvent) to form the pastes. These were screen-printed over the Ag electrodes on alumina substrates to form SnO₂, TiO₂, and TiO₂/ZnO capacitor pressure sensors accordingly. The evaluation of pressure sensing properties of these sensors was performed using a HP 4192A Impedance Analyser, which recorded the changes in the values of the capacitances under different mechanical stresses. At the applied load of 5 kPa, the response times of 2.5 s, 5.6 s and 4 s were recorded for SnO₂, TiO₂, and TiO₂/ZnO sensors, respectively. In addition to instant response times, these pressure sensors have the advantage of being reusable, as their electrical properties were restored to the original value after annealing for 2 h at 80 °C. Moreover, one year later after the initial testing, the sensors were still operational and produced similar time responses to pressure.     

Determination of the Dill parameters of thick positive resist for use in modeling applications

The determination of Dill parameters of thick resist is very important to improve simulation models of resist exposure and real world processes. A new extraction technique of Dill parameters based on spectroscopic ellipsometry in combination with an advanced resist exposure model is proposed for thick resist analysis. The complex refractive index of the resist is related to the relative concentration of the photoactive compound in the resist in order to describe the vertical distribution of the refractive index and the extinction coefficient. Moreover, Dill parameters are extracted by directly fitting the bleaching curves to the measured ellipsometry data. The new approach was investigated experimentally by spectroscopic ellipsometry measurements on AZ5214E resist with two moderate layer thickness values in order to verify the accuracy of the new method. Dill parameters were extracted by using this new technique and by applying resist samples subjected to different exposure doses. Possible reasons for the variation of Dill parameters depending on resist thickness are explained. Furthermore, advantages, limitations and potential improvements of the model are discussed. Finally, the impact of Dill parameter variation on image formation in the resist is demonstrated by applying the spectroscopic ellipsometer analysis results as input parameters to the lithography simulator Dr.LiTHO.     

厚PTFE陶瓷基板钻孔参数的优化探讨

厚PTFE陶瓷基板是陶瓷粉填充的高频材料,其材料内含有大量陶瓷粉,且有聚四氟乙烯（PTFE）树脂,在钻孔参数设置不当时极易产生孔口披峰、崩孔或铜瘤等问题。结合厚PTFE陶瓷基板板材的特性,从钻孔参数上进行优化试验,以解决此类厚PTFE陶瓷材料的钻孔加工过程中出现的披峰、铜瘤问题。     

潭口稠油热采实践及认识

潭口稠油为浅层特稠油油藏,通过对潭口南区、北区注汽吞吐采油开发,认识不同井区注汽周期的生产特点。结合井网加密、注氮工艺配套生产,探索潭口稠油油田合理的注汽采油模式,提高蒸汽吞吐的有效性,提高其开发效果。     

Tangential cover for thick digital curves

The recognition of digital shapes is a deeply studied problem. The arithmetical framework, initiated by Reveillès [Géométrie discrète, calcul en nombres entiers et algorithmique, Thèse d’Etat, 1991], provides a powerful theoretical basis, as well as many algorithms to deal with digital objects. The tangential cover, first presented in Feschet and Tougne [Optimal time computation of the tangent of a discrete curve: application to the curvature, in: G. Bertrand, M. Couprie, L. Perroton (Eds.), 8th Discrete Geometry for Computer Imagery, Lecture Notes in Computer Science, vol. 1568, Springer, Berlin, 1999, pp. 31-40] and Feschet [Canonical representations of discrete curves, Pattern Anal. Appl. 8(1-2) (2005) 84-94] is a useful tool for representing geometric digital primitives. It computes the set of all maximal segments of a digital curve and permits either to obtain minimal length polygonalization or asymptotic convergence of tangents estimations. Nevertheless, the arithmetical approach does not tolerate the introduction of irregularities, which are however inherent to the acquisition of digital shapes. The present paper is an extension of Faure and Feschet [Tangential cover for thick digital curves, in: D. Coeurjolly, I. Sivignon, L. Tougne, F. Dupont (Eds.), DGCI 2008, Lecture Notes in Computer Science, vol. 4992, Springer, Berlin, 2008, pp. 358-369], in which we propose a new definition for a class of the so-called “thick digital curves” that applies well to a large class of digital object boundaries. We then propose an extension of the tangential cover to thick digital curves and provide an algorithm with an O(nlogn) time complexity, where n denotes the number of points of specific subparts of the thick digital curve. In order to keep up with this low complexity, some critical points must be taken into account. We describe all required implementation details in this paper.     

钢筋混凝土厚板楼盖的裂缝及处理

本文介绍了钢筋混凝土厚板楼盖的破坏形态 ,用PK PM软件计算了结构的承载力 ,本文还用ANSYS有限元软件分析了结构的破坏状态 ,并讨论了加固方法     

Comparison between titania thick films obtained through sol-gel and hydrothermal synthetic processes

Titania films were obtained through two synthetic processes, a traditional sol-gel method and a hydrothermal route. In SG synthesis, thermal decomposition of the precursor in oven at 400 °C for 2 h led to pure anatase TiO₂; in HY synthesis, instead, crystalline anatase grains were obtained in autoclave at 200 °C for 1 h. To investigate the microstructural evolution of SG and HY titania with temperature, each powder was annealed at 650, 750, 850 °C for 1 h and subjected to XRD analysis. Surprisingly, HY titania, contrary to SG, maintained the anatase phase, up to 850 °C, without any introduction of foreign elements. The sensing layers, obtained from as grown powders, were fired at 650, 750 or 850 °C and tested vs. methane and carbon monoxide. Both types of films fired at 850 °C yield insignificant responses to both CO and CH4, demonstrating the lack of influence of the crystalline phase on the gas response. Moreover, as regards the films fired at 650 and 750 °C, the gas responses are higher for SG than for HY samples, despite larger particle size.