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By using poled-polymer/silicon slot waveguides in the active region and the Pockels effect of the poled-polymer, we propose a kind of Mach-Zehnder interferometer (MZI) electro-optic (EO) switch operated at 1 550 nm. Structural parameters are optimized for realizing normal switching function. Dependencies of switching characteristics on the slot waveguide parameters are investigated. For the silicon strip with dimension of 170 nm×300 nm, as the slot width varies from 50 nm to 100 nm, the switching voltage can be as low as 1.0 V with active region length of only 0.17–0.35 mm, and the length of the whole device is only about 770–950 μm. The voltage-length product of this switching structure is only 0.17–0.35 V.mm, and it is at least 19–40 times smaller than that of the traditional polymer MZI EO switch, which is 6.69 V.mm. Compared with our previously reported MZI EO switches, this switch exhibits some superior characteristics, including low switching voltage, compact device size and small wavelength dependency. 相似文献
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基于CO2气藏开发过程中,不同的驱动类型的影响,同时考虑CO2在地层水中的溶解的特殊性,增加溶解气的影响分析.根据地下体积平衡原理,建立定容CO2气藏和水驱CO2气藏的物质平衡方程,并以实例分析证明该物质平衡方程的实用性. 相似文献
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鉴于现有气相阈压梯度预测模型不能准确描述气相阈压梯度随气相连续性的变化规律,在改进气相阈压梯度实验流程的基础上,选取四川盆地普光气田下三叠统飞仙关组碳酸盐岩储层标准岩心,开展了气相阈压梯度实验,建立了综合考虑岩石渗透率和气相连续性的气相阈压梯度预测模型,对比分析了基于不同气相连续性表征参数建立的气相阈压梯度预测模型的预测结果。然后,根据该气藏气井的测井解释成果,采用基于相对可动气饱和度建立的气相阈压梯度预测模型,预测了不同类型储层的气相阈压梯度。研究结果表明:①相对可动气饱和度考虑了束缚水饱和度和残余气饱和度对气相连续性的影响,较之于含水饱和度而言,相对可动气饱和度能够更好地表征气相在多孔介质中的连续性;②气相阈压梯度随岩石渗透率、相对可动气饱和度的降低而增大,在渗透率、相对可动气饱和度较低时,气相阈压梯度随渗透率、相对可动气饱和度的降低而急剧增大;③普光气田主体气藏Ⅰ类储层的气相阈压梯度较小,其数量级在0.01 MPa/m,Ⅱ类储层的气相阈压梯度较Ⅰ类储层有所增大,Ⅲ类储层的气相阈压梯度则急剧增大。结论认为,基于相对可动气饱和度建立的气相阈压梯度预测模型能够更加准确地描述气相阈压梯度随岩石渗透率和气相连续性的变化规律,所取得的研究成果可以为准确认识水驱气藏气—水两相渗流规律奠定基础。 相似文献
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