无尾两栖类听觉中脑对声音时相信息的神经处理

时相特征处理是动物重要的听觉功能．介绍了关于无尾两栖类动物的听中脑（半环隆枕）神经元在声时相特征处理中的选择性反应的研究结果,阐明了这些选择性反应对动物个体进行声辨别进而维持物种的生存、繁衍具有的重要意义,提出了在半环隆枕处理时相特征研究中需要进一步解决的一些问题及研究方向．     

调频声频率变化率对大鼠听皮层神经元声反应的影响

采用在体细胞外单细胞记录方法,研究调频声频率变化率及时程对调频声所诱发的听皮层神经元反应的影响.实验在34只乌拉坦麻醉的SD大鼠上进行,在皮层41区记录了113个对调频声有反应的细胞电活动.观察发现,调频声刺激的时程和频率变化率发生改变,可对诱发的听皮层神经元反应的反应型式和放电频数产生影响.这种影响表明,听皮层在复杂声上传信息的处理过程中可能存在复杂的编码机制.     

果蝇内含子和编码序列的信息参数D_2沿染色体分布

本文以果蝇染色体的内含子和编码序列作为研究对象,用信息参数D2分析两类序列沿着染色体的分布规律,并用多项式拟合分析染色体各类序列沿染色体的统计分布特征,分析D2参数的平均值在不同的染色体臂的分布特征.     

纯态纠缠源条件下密集编码的信道容量比较

依据量子纠缠能被用来实现量子密集编码，从而增加量子信道的经典信息容量的理论，讨论并比较了在无噪信道中利用纯态纠缠源进行直积态密集编码和纠缠密集编码两种情况下的信道容量上限，得到了应用纠缠编码方式的信道容量不大于应用直积态编码方式的信道容量的结果．     

安徽省就业结构时空演变分析

把就业弹性和信息熵作为测度就业结构均衡度的指标,并将其运用于安徽省就业结构变化特征的分析中.分析结果显示,就业弹性方面:经济增长相对稳定时,第一产业就业弹性总体为负值,二三产业就业弹性同向变化且为正值.行业就业结构方面:安徽省就业结构的熵值变化反映出全省多数行业仍然处于扩大规模的加速发展阶段,就业结构均衡性增强;安徽省17个地市行业就业结构信息熵在时间维和空间维上具有区域分异规律.     

视皮层假体中的视觉信息编码方法研究

视皮层假体的研究对眼科医学具有重要的意义;设计了一种视皮层假体的结构,提出了一种基于视觉机理的图像信息编码策略;实际图像的仿真结果表明,本方法在保证图像质量的前提下,能采用更少的神经元来表征自然图像中的重要信息,为减少植入皮层刺激电极的数量提供了理论参考.     

铸铁中第三组元的偏析参数

本文从schiel方程推导出在给定冷却速度下铸铁枝晶奥氏体及共晶奥氏体中第三组元的偏析参数KS和偏析梯度KR的计算式,并讨论了计算值与实测值之间的差别。     

不同传感器安装方式对隧道现场声发射参数监测结果的影响

为研究不同传感器安装方式对隧道现场声发射监测结果的影响,以渝广高速华蓥山隧道掘进爆破中的声发射响应试验为依托,通过隧道现场试验的方法对比了原岩表面安装、初衬表面安装、锚杆端部安装等3种声发射传感器安装方式下的声发射参数监测结果。从参数分析结果来看,不同的传感器安装与耦合方式对声发射监测结果有较大的影响,尤其是锚杆端部安装方法的声发射参数监测结果与前两者差异较大,这种差异主要源于波传播过程中穿过的交界面数量及介质截面积变化等,因此在现场监测过程中应当重点关注监测点附近的结构特征,选择合理安装方式,或充分利用监测点附近结构对信号的放大效应,削弱衰减与环境噪声的影响。     

掘进巷道瓦斯涌出规律及通风机参数优选

利用巷道测定法对新安煤矿3上201运输巷掘进期间煤壁和落煤瓦斯涌出规律进行了现场实测,并通过理论分析建立了掘进煤巷瓦斯涌出量与巷道掘进长度和掘进速度的关系式,测定了煤巷瓦斯排放极限长度并据此计算出掘进巷道在掘进过程中的最大瓦斯涌出量,进而确定了巷道最大需风量,以此为依据进行了巷道局部通风机通风参数的优选.     

基于TerraSAR-X图像的北部湾海浪要素提取方法研究

【目的】研究如何从TerraSAR-X图像中获取实时、准确的海浪信息。【方法】基于海面风场反演的地球物理模型和海浪的参数化初猜谱反演模式来获取海浪要素信息,并使用HH极化方式在北部湾海域成像的TerraSAR-X进行实例验证,再把反演结果与WaveWatchⅢ模式运算结果进行对比。【结果】有效波高的绝对误差为0.8m,平均周期的绝对误差为1.9s。【结论】本文的方法能有效的从TerraSAR-X中提取海浪要素的信息。     

Temporal properties of pattern adaptation of relay cells in the lateral geniculate nucleus of cats

The temporal properties of pattern adaptation of relay cells induced by repeated sinusoidal drifting grating were investigated in the dorsal lateral geniculate nucleus (dLGN) of cats. The results showed that the response amplitude declined and the response latency prolonged when relay cells were pattern-adapted in dLGN, like the similar findings in visual cortex. However, in contrast to the result in cortex, the response phase of relay cells advanced. This implies that an inhibition with relatively long latency may participate in the pattern adaptation of dLGN cells and the adaptation in dLGN may be via a mechanism different from that of visual cortex.     

Temporal and spatial variabilities of sea surface heights in the northeastern South China Sea

Analyses of sea surface height anomalies (SSHA) from Jan. 1993 to Dec. 2001 measured by TOPEX/Poseidon (T/P) satellite altimetry indicate that there are two energy highs of SSHA fluctuations on both sides of the Luzon Strait. The highs centered at (19.5°N, 119.5°E) and (22.0°N, 124.0°E) respectively, are separated by a low energy band in the Strait. Empirical Orthogonal Function (EOF) analysis on the "Far Field" suggests that fluctuations of these two areas are mutually independent. EOF analysis on the "Near Field" shows that SSHA oscillation in the northeastern South China Sea (SCS) is dominated by seasonal variations accompanied with significant intra-seasonal and inter-annual fluctuations. Among which, EOFI and EOF2 reflect 66.7% of the total variance. They are both seasonal but showing three months difference in phase. The basic pattern of EOFI appears to be the seasonal SSHA oscillation centered at (18.0°N, 119.0°E) northwest off Luzon Island, which shows maximums (minimums) in August/Septemb     

负二项分布参数的线性组合之估计的非容许性

本文考虑负二项分布参数的线性组合之估计的非容许性,证实了DasGupta和Sinha的猜测,并讨论了Hudson中一个分布的情形,得到了类似的结果。     

腐蚀过程电化学动力学参数的估算

利用单纯形推移法,对三参数和四参数极化方程式求取电化学动力学参数拟合,然后将拟合结果作为高斯－牛顿法的初值,解决了后者初值选择限制问题。将其应用于实测数据与模拟数据的拟合,取得比较好的效果。     

Effect of D-allethrin on proteinase activity in the midgut of the spider Pardosa pseudoannulata detected by bulk acoustic wave impedance technique

The piezoelectric bulk acoustic wave (BAW) impedance analysis method was employed to monitor in situ the proteinase-catalyzed hydrolyzation of casein and the effect of pesticide D-allethrin on the proteinase activity in the midgut of the spider Pardosa pseudoannulata, and the results obtained were verified by ultraviolet spectroscopy. The hydrolyzation was significantly increased in the presence of low-dose D-allethrin, whereas significantly inhibited in the presence of high-dose D-allethrin, and a correlation was found precisely between the enzyme activity reflected by the final frequency shift after the hydrolyzation and the concentration of D-allethrin, with a significant frequency response observed even at a 1.5×10^-5 volume ratio of D-allethrin to distilled water. The present work may have presented a novel method feasible for study on the mechanism of excitability of spiders under low-dose D-allethrin pesticide and quick detection of proteinase activity.