排序方式: 共有15条查询结果,搜索用时 15 毫秒
1.
孙立立 《计算机光盘软件与应用》2013,(6)
近日,美国出台拨款法案《2013年综合持续拨款法案》禁止美国3个政府部门采购我国信息技术和系统,引发各界广泛关注。本文概述了该法案的主要内容、背景和各界的反应,分析了可能给我国带来的影响,并提出了保护我国安全和利益的相关建议。 相似文献
2.
3.
A single-mode-few-mode-thin-core-single-mode (SFTS) structure based optical fiber sensor is fabricated and experimentally studied. The sensing principle relies on the inter-modal interference. Since the core diameter of few-mode fiber (FMF) is larger than that of single-mode fiber (SMF), the FMF helps to allow more light to enter the cladding of thin-core fiber (TCF), which helps TCF to excite cladding modes. The interference between core and cladding modes in TCF occurs at the joint of lead-out SMF and TCF. Experimental results demonstrate a refractive index (RI) sensitivity of ?103.34 nm/RIU and a temperature sensitivity of 0.05 nm/°C. The proposed sensor not only can measure temperature, but also can measure RI. In addition, the proposed sensor is simple for without complicated fabrication process. 相似文献
4.
5.
6.
7.
8.
9.
10.
采用偏光显微镜和原子力显微镜研究了在特定温度下聚对苯二甲酸丙二酯的晶体形态和熔融行为。结果表明,聚对苯二甲酸丙二酯(PTT)的结晶形态依赖于结晶温度,在不同等温结晶温度下球晶依照无环带→规则环带→锯齿形环带→无环带的规律逐渐改变;环带宽度也随结晶温度的升高而增加。环带球晶在加热过程中熔融并伴随着环带的变化,由于晶片的熔融再结晶,环带形态经历了清晰→模糊→清晰→融化的渐变过程。 相似文献