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101.
102.
偏振控制的光折变开关 总被引:5,自引:3,他引:2
提出了两种模式偏振控制的光折变开关,推导了用非常偏振和寻常偏振光读出时的全息光栅的衍射效率比公式,该公式表明全息的衍射效率与偏振有关,衍射效率比可达80%~90%,利用这种特性可以实现光开关。 相似文献
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背景在直线l上摆放着三个正方形.(1)如图1,已知水平放置的两个正方形的边长依次是a,b.斜着放置的正方形的面积S=____,两个直角三角形的面积和为____;(均用a,b表示)(2)如图2,小正方形的面积S1=1,斜着放置的正方形的面积S=4,求图中两个钝角三角形的面积m1和m2,并给出图中四个三角形的面积关系; 相似文献
105.
Physical and chemical effects of phosphorus-containing compounds on laminar premixed flame 下载免费PDF全文
Phosphorus-containing compounds are the promising halon alternatives for flame inhibitions. However, some literatures suggested that the phosphorus-related inhibitors may behave as the unfavorable ones that will increase the burning velocity under lean-burn conditions, and this indeed posed potential threats to the fire prevention and fighting. To seek deeper insights into the reaction process, a numerical investigation was actualized to study the phosphorus-related effects on methane-air flames. By replacing a phosphorus-related inhibitor with the corresponding decomposed molecules, the detailed promoting and inhibiting effects of combustion were separated from the general chemical effect. A comparative study was carried out to identify the interaction between the two effects under different combustion conditions. It is observed that the promoting effect becomes the dominant factor during the reaction process when the equivalence ratio is smaller than 0.60. In this lean-burn condition, the exothermic reactions were faster than the others within the reaction chains due to the reduction of radical recombination in hydrocarbon oxidation. The results are believed to be useful for the further application and improvement of flame inhibitors. 相似文献
106.
Influences of total ionizing dose on single event effect sensitivity in floating gate cells 下载免费PDF全文
The influences of total ionizing dose(TID) on the single event effect(SEE) sensitivity of 34-nm and 25-nm NAND flash memories are investigated in this paper. The increase in the cross section of heavy-ion single event upset(SEU) in memories that have ever been exposed to TID is observed, which is attributed to the combination of the threshold voltage shifts induced by γ-rays and heavy ions. Retention errors in floating gate(FG) cells after heavy ion irradiation are observed.Moreover, the cross section of retention error increases if the memory has ever been exposed to TID. This effect is more evident at a low linear energy transfer(LET) value. The underlying mechanism is identified as the combination of the defects induced by γ-rays and heavy ions, which increases the possibility to constitute a multi-trap assisted tunneling(mTAT) path across the tunnel oxide. 相似文献
107.
We propose a new image encryption algorithm on a basis of the fractional-order hyperchaotic Lorenz system. While in the process of generating a key stream, the system parameters and the derivative order are embedded in the proposed algorithm to enhance the security. Such an algorithm is detailed in terms of security analyses, including correlation analysis, information entropy analysis, run statistic analysis, mean-variance gray value analysis, and key sensitivity analysis. The experimental results demonstrate that the proposed image encryption scheme has the advantages of large key space and high security for practical image encryption. 相似文献
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聚合物光纤辐照特性的实验研究 总被引:2,自引:1,他引:2
分析了聚合物受辐照后发生物理化学变化的机理,实验研究了聚苯乙烯(PS)、聚碳酸脂(PC)、聚甲级丙烯酸甲脂(PMMA)三种聚合物光纤在不同辐照剂量下光传输性能的变化以及其恢复特性.在各种辐照剂量下,光透过率有不同程度的下降,经过一段时间后也有不同程度的回复,并且恢复主要发生在停止辐照后的较短时间内.在102 Gy以下,辐照造成的光损伤经过一段时间基本可以恢复,在更高剂量的辐照下(超过5*103 Gy),辐照对光纤造成了永久损伤,经过很长时间也只能恢复一部分.实验结果表明,PS光纤的抗辐照特性最好,PC光纤优于PMMA光纤. 相似文献
110.