外加直流电场对PdSnOx MIS型氧探测器氧吸附行为影响的研究

研制成了一种新型的Pd-SnOx MIS结构型氧探测器。这种探测器能在室温下探测小于0.1乇的氧分压。本文简扼报告了这种器件的结构、制造工艺和氧吸附与消吸附特性,着重阐述外加直流偏压对器件氧吸附行为的影响。实验结果表明:在实验氧分压范围内,正向直流偏压会抑制器件的氧吸附响应,负向直流偏压会增加器件氧吸附响应。文中还对这种电吸附行为进行了讨论。     

热波在多层膜中的传导模型及其应用

利用动态辐射引起的热波多层膜中的传导的一维模型，讨论了复合结构薄膜热释电探测器的性能。结果表明：在衬底与热释电薄膜之间加入绝热层，是提高多层薄膜热电探测器性能的有效手段；绝热层性能对热释电性能有决定性的影响。     

SMA同轴封装高速光电探测器

采用自制ＳＭＡ同轴管壳和普通ＴＯ－１８管过对同型同批的ＩｎＧａＡｓＰＩＮ光电探测器芯片进行了封装并用自建测试系统对其Ｃ－Ｖ特性进行了测试比较，结果表明：与普通ＴＯ－１８管壳封装相比，ＳＭＡ同轴管壳封装器件电容减少～０．４ｐＦ，上升时间ｔｒ由８５ｐｓ减至２５ｐｓ以下，半高全宽ＦＷＨＭ由２１０ｐｓ减至８５ｐｓ，等效－３ｄＢ带宽增至６ＧＨｚ以上，瞬态特性显著改善。     

非晶硅光位敏探测器的开发

以横向光伏效应为工作模式,采用全非晶硅的Pin结构,研制了一维可见光波段的光位敏探测器(PSD_s).测试结果表明,该探测器的光位敏度可达9.7mV/mm,光讯号—位移的线性探测区占有效探测总面积的65％,而最大有效光敏面积约为2cm~2.     

高速Ge光电探测器脉冲和频率响应的特性测量

本文用电光采样技术测量了高速Ge雪崩光电二极管的脉冲响应特性,利用计算机进行快速傅里叶变换(FFT)运算,得到了探测器的频率响应曲线。     

Preliminary study of microscale zircon oxygen isotopes for Dabie-Sulu metamorphic rocks： Ion probe in situ analyses

151 in situ analyses of oxygen isotopes were carried out by ion micro-probe for zircons from 8 localities of HP-UHP metamorphic rocks including eclogites in the Dabie-Sulu terrane. The results show significant heterogeneity in δ^18O values, with variation in different rocks from -8.5‰ to 9.7‰ and within one sample from 2‰ to 12‰. No measurable difference in δ^18O was observed between protolith magmatic (detrital) zircons and metamorphic recrystallized zircons within analytical uncertainties from the ion micro-probe measurements. This indicates that the metamorphic zircons have inherited the oxygen isotopic compositions of protolith zircons despite the HP to UHP metamorphism. According to their protolith ages from zircon U-Pb in situ dating by the same ion micro-probe, two groups of oxygen isotope composition are recognized, with one having δ^18O values of 6‰-7‰ for old protolith of 1.9-2.5 Ga ages and the other 0‰-2‰ for young protolith of 0.7-0.8 Ga ages. The latter anomalously low δ^18O values of zircons indicate that the magma has had the obvious involvement of meteoric water when forming the young protolith of high-grade metamorphic rocks. This may be correlated with the snowball Earth event occurring in South China and the world elsewhere during the Neoproterozoic.     

Immune Based Intrusion Detector Generating Algorithm

Immune-based intrusion detection approaches are studied. The methods of constructing self set and generating mature detectors are researched and improved. A binary encoding based self set construction method is applied. First, the traditional mature detector generating algorithm is improved to generate mature detectors and detect intrusions faster. Then, a novel mature detector generating algorithm is proposed based on the negative selection mechanism. According to the algorithm, less mature detectors are needed to detect the abnormal activities in the network. Therefore, the speed of generating mature detectors and intrusion detection is improved. By comparing with those based on existing algorithms, the intrusion detection system based on the algorithm has higher speed and accuracy.     

Effects of forward masking on the responses of the inferior collicular neurons in the big brown bats, Eptesicus fuscus

The present study explores the forward masking of the two-tone stimuli in sequence that evoked responses in the inferior colliculns (IC) of the echolocating bats. The results indicate that forward masking is obvious in the acoustic responses of the IC neurons to the two-tone stimuli.Meanwhile the intensity sensitivity of the neurons responding to the probe increases with the inter-tone interval decreasing. The effects of forward masking are correlated with the relative intensity and the interval between the masker and probe. That is, the effects of forward masking are reduced with the masker intensity decreasing and enhanced with the probe intensity decreasing and the inter-tone interval shortened. The present study suggests that there is a correlation between the characteristics of the response to the probe and the dynamic conditions of the postsynaptic currents in the IC neurons.