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一种抗高温暂堵剂的研制 被引量:5
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作者 陈彬 金勇 +2 位作者 张伟 狄明利 苗海龙 《当代化工》 CAS 2022年第3期505-508,512,共5页
随着油气资源勘探开发程度的不断提高,勘探领域逐渐走向陆地深层超深层、海洋深水深层、高温地热以及干热岩等复杂高温地层。目前常用堵漏材料抗高温性能较差、酸溶或降解性能较差,极易对高温储层造成永久伤害,无法满足高温储层酸化解... 随着油气资源勘探开发程度的不断提高,勘探领域逐渐走向陆地深层超深层、海洋深水深层、高温地热以及干热岩等复杂高温地层。目前常用堵漏材料抗高温性能较差、酸溶或降解性能较差,极易对高温储层造成永久伤害,无法满足高温储层酸化解堵的技术需要。为此,基于所研选的抗高温刚性颗粒、高强度片状材料及抗高温可酸溶纤维,研制出适用于不同裂缝开度的抗高温暂堵剂FRACSEAL,其抗温能力可达210℃,可有效封堵裂缝开度达10 mm裂缝,承压能力可达20 MPa,酸溶率可达94%以上,适用于高温储层裂缝。 展开更多
关键词 高温储层漏失 堵漏材料特性参数化表征 抗高温暂堵剂 高酸溶
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钢箱梁受弯屈曲的磁记忆参数表征 被引量:2
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作者 韦璐茜 苏三庆 +1 位作者 王威 严敏嘉 《振动与冲击》 EI CSCD 北大核心 2022年第16期142-148,共7页
为了探究金属磁记忆检测技术对桥梁钢构件屈曲部位的损伤预测,采用金属磁记忆技术检测了Q345qC四点受弯波纹腹板钢箱梁表面的磁场强度法向分量H_(p)(y),提取磁表征量并对其与荷载之间的关系进行了分析。研究结果表明:金属磁记忆检测技... 为了探究金属磁记忆检测技术对桥梁钢构件屈曲部位的损伤预测,采用金属磁记忆技术检测了Q345qC四点受弯波纹腹板钢箱梁表面的磁场强度法向分量H_(p)(y),提取磁表征量并对其与荷载之间的关系进行了分析。研究结果表明:金属磁记忆检测技术可用于对施工阶段桥梁钢构件表面的失稳监测,易屈曲位置可以通过磁表征量H_(con)的变化规律反映。研究分析认为,易屈曲位置的磁表征量H_(con)随荷载的变化呈现先上升,临近构件屈服时下降的规律。通过H_(con)变化的规律性可以判别易屈曲位置,通过H_(con)开始下降的时间可以对屈曲进行预警,防范灾害的发生。该研究为施工阶段钢结构的失稳监测提供了一种有效方法。 展开更多
关键词 结构健康监测 屈曲参数表征 金属磁记忆 波纹腹板钢箱梁 无损检测
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一种会聚区声场基于参数化表征的方法研究 被引量:1
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作者 吕琳 冯达 《舰船电子工程》 2018年第5期134-137,共4页
针对会聚区目标判定缺乏有效的特征判据问题,论文给出了一种利用参数a、b、c作为会聚区声场特征因子表征会聚区声场的方法,通过理论分析及仿真计算,当用a,b,c三参数来描述声场的水平特征时,a,b,c三参数有明确的物理意义,计算出的声场传... 针对会聚区目标判定缺乏有效的特征判据问题,论文给出了一种利用参数a、b、c作为会聚区声场特征因子表征会聚区声场的方法,通过理论分析及仿真计算,当用a,b,c三参数来描述声场的水平特征时,a,b,c三参数有明确的物理意义,计算出的声场传播损失和用kraken软件计算出的结果吻合良好,说明声场参数化表征方法可很好地描述会聚区声场特征。在实际应用中,如能够根据实际会聚区声场特征,获得特征因子a、b、c,表征会聚区与非会聚区声场特征差异,可为会聚区的判定提供参考标准。 展开更多
关键词 会聚区 声场 声场参数化表征
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Characterization and analysis of coded excitation ultrasound parameters for rock properties 被引量:2
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作者 ZHU Wei WU Hezhen 《Chinese Journal of Acoustics》 CSCD 2017年第1期29-42,共14页
Coded excitation technology (CET) can effectively enhance the penetration and resolution of ultrasonic testing. To analyze the influence of rock properties on pulse compression performance (PCP) of coded excitatio... Coded excitation technology (CET) can effectively enhance the penetration and resolution of ultrasonic testing. To analyze the influence of rock properties on pulse compression performance (PCP) of coded excitation signals (CES), a numerical simulation, and an ultrasonic experiment on different rock samples are performed; and the detection ability of several CESs are also investigated and compared. The results of experiments showed that the loss of the signal-to-noise ratio (SNR) of Barker coded signal with tapered linear frequency modulated carrier (BTLFM) is always less than Barker coded signal with sine carrier (BS), while the resolution loss of BTLFM is lower than tapered linear frequency modulated signal (TLFM). In sum, the results not only verifiy the effectiveness of CET, but also provide a basis for the parameter settings of coded signals used in rock ultrasonic testing. 展开更多
关键词 ROCK characterization and analysis of coded excitation ultrasound parameters for rock properties
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Fluid-dynamics evaluation in a conical spouted bed and characterization of foxtail millet seeds 被引量:1
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作者 Lidiane Diniz do.Nascimento Lorena Gomes Corumba +3 位作者 Sandra Cristina dos Santos Rocha Osvaldir Pereira Taranto Cristiane Maria Leal Costa Lenio Jose Guerreiro de Faria 《Particuology》 SCIE EI CAS CSCD 2015年第6期75-81,共7页
Foxtail millet (Setaria italica) is one of the most valuable species in economic terms in the genus Setaria and plays an important role in human nutrition, animal feed, and agriculture. The present study described c... Foxtail millet (Setaria italica) is one of the most valuable species in economic terms in the genus Setaria and plays an important role in human nutrition, animal feed, and agriculture. The present study described chemical, physical, and quality aspects of seeds of foxtail millet. Furthermore, the fluid-dynamic behavior of the seeds was evaluated in a conical spouted bed, which has advantages in terms of promoting the cyclic and regular movement of the seed particles. Dynamic parameters of spouting (minimum spouting veloc- ity, stable and peak pressure drop) were determined and compared with those obtained from empirical correlations available in the literature. The results obtained from physical characterization showed that the seeds can be classified as belonging to Group D of Geldart, having a non-rough surface, mean diameter of 1.75 mm, and sphericity of 0.74. Fluid-dynamics analysis showed that the seeds are suitable for processing in a spouted bed, which is in agreement with the results of particle physical characterization. 展开更多
关键词 Foxtail millet parameters of spouting characterization Conical spouted bed
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A Method for Minimization Design of Two-Level Logic Networks Using Multiplexer Universal Logic Modules 被引量:2
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作者 姜文彬 《Journal of Computer Science & Technology》 SCIE EI CSCD 1994年第1期92-96,共5页
A decomposition approach of the combinational functions is discussed. A design method, by which the minimization or near minimization of two-level combinational network can be obtained, is presented for a combinationa... A decomposition approach of the combinational functions is discussed. A design method, by which the minimization or near minimization of two-level combinational network can be obtained, is presented for a combinational function realized by using multiplexer universal logic modules. Using the method, the automated synthesis of the combinational functions can be accomplished on a computer. 展开更多
关键词 Function decomposition characterizing parameter multiplexer realization logic design minimization design
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