Adapting to supernormal auditory localization cues. I. Bias and resolution

Head-related transfer functions (HRTFs) were used to create spatialized stimuli for presentation through earphones. Subjects performed forced-choice, identification tests during which allowed response directions were indicated visually. In each experimental session, subjects were first presented with auditory stimuli in which the stimulus HRTFs corresponded to the allowed response directions. The correspondence between the HRTFs used to generate the stimuli and the directions was then changed so that response directions no longer corresponded to the HRTFs in the natural way. Feedback was used to train subjects as to which spatial cues corresponded to which of the allowed responses. Finally, the normal correspondence between direction and HRTFs was reinstated. This basic experimental paradigm was used to explore the effects of the type of feedback provided, the complexity of the stimulated acoustic scene, the number of allowed response positions, and the magnitude of the HRTF transformation subjects had to learn. Data showed that (1) although subjects may not adapt completely to a new relationship between physical stimuli and direction, response bias decreases substantially with training, and (2) the ability to resolve different HRTFs depends both on the stimuli presented and on the state of adaptation of the subject.     

Effects of chronic U50,488H treatment on binding and mechanical responses of the rat hearts

The effects of chronic injection of U50,488H (trans-3,4-dichloro-N-[2-(1-pyrrolidinyl)cyclohexyl]benzeacetamidel++ +), a selective kappa opioid agonist, on the properties of the binding sites of tritiated U69593 [(5 alpha,7 alpha,8 beta)-(-)-N-methyl-N-(7-(1-pyrrolidinyl)-1-oxaspiro (4,5)dec-8-yl)benzeneacetamide], another selective kappa opioid agonist, and mechanical responses to U50,488H of the heart were studied. Rats received injection twice a day with U50,488H for 4 days. Binding studies on the crude membrane homogenates revealed that there was no change in maximum binding, but a significant increase in Kd after the treatment, indicating that the number of kappa binding sites remained unchanged whereas the affinity of the binding sites to kappa-agonist decreased. The study on the mechanical responses to U50,488H in the isolated perfused heart preparation showed that although the agonist at 10(-6) M caused MR2266 reversible reductions in heart rate and force of contraction as well as ventricular ectopic beat in the heart of rats in the control group, its effects were absent in the U50,488H-treated group, indicating the development of tolerance to the mechanical effects of U50,488H on the heart. The results indicate that the development of tolerance to the mechanical effects of a kappa-agonist after chronic treatment with the agonist was not accompanied by down-regulation, but only a slight and significant reduction in affinity of kappa binding sites in the rat heart.     

姑山矿空心砖厂原料处理工艺线的实际应用探讨

文章结合制砖行业原料处理工艺的特点,阐述了姑山矿空心砖厂原料制备过程中所存在的主要问题及相应解决办法.通过对改造前后原料处理工艺的使用效果进行对比,改造后的原料处理工艺更适合于生产线的要求,并且在生产中取得了较好的实际应用效果.     

多属性神经网络地震反演在NB油田水平井钻探中的应用

NB油田位于渤海海域,为新近系河流相稠油油田,储层横向分布不稳定,砂体厚度薄、连通性较差,油水关系复杂,开发设计部署了大量水平井。选择神经网络反演方法,建立地震属性与储层参数的非线性关系,进而根据其关系反演得到储层参数数据体,利用该数据体沿层切片提取储层预测信息,研究储层发育规律,指导该油田水平井的部署和钻探,取得了较好的效果,降低了钻探风险。用神经网络地震反演方法进行储层预测研究,指导水平井钻探,在渤海海域尚属首次。     

CSP工艺生产微钛钢中的碳氮化物析出相

在钢中添加一定量的Ti可以提高钢的力学性能。细小的TiN弥散粒子可起到一些有利作用。例如，TiN粒子可以细化钢的铸态组织；减少有害夹杂物的析出；提高奥氏体粗化温度；防止形成过大的奥氏体晶粒等。     

高层建筑结构设计特点与剪力墙设计

围绕高层建筑结构，总结了高层建筑结构设计的特点，提出了剪力墙设计的几个问题，以及高层建筑结构分析和各种体系相对应的方法。     

电子机箱小环境换热器设计

提出了一种应用于电子机箱小环境散热的换热器结构,通过温度实验对该结构换热器的性能进行了分析.实验结果表明,换热器正常工作时具有一定的换热能力,环境温度的大小对其换热效果影响较小,输入空气的压力大小对换热效果没有影响.     

基于地震道时频分析的地层结构解析原理和方法

 地震时频分析是通过对地震信号采用多种数学变换，实现从时频域角度对信号的局部特征进行分解，剖析信号细微特征所对应的地层结构。在应用地震时频分析技术过程中，人们对于这项技术能否真正有效地解决实际地质问题存在许多争论。本文从时频原理综合分析的角度出发，对地震道时频谱中各种频率特性参数和时频旋回直接转化成对地层结构逐级、分步的解析方法进行了较深入的探讨。研究认为时频分析原理不仅是对地震数据进行特殊数学变换，实现对信号的分解，而且充分利用了地层厚度的调谐效应及岩性调谐效应；时频谱与地质结构特征之间的良好响应关系为地震地质精细解释提供了直观的依据。     

MPLS交换路由器的设计与实现

MPLS是目前Internet核心网上最看好的技术，基于Crossbar的高速交换技术的发展也很快，但是如何实现2种技术的有机结合以到达最优的性能却有一系列问题需要考虑。本文结合某MPLS路由器的设计项目，综合考虑了当前MPLS的标准以及有关交换结构的最新技术，对实现MPLS交换路由器进行了深入研究，并详细探讨了高速接口、排除和调度以及Crossbar等关键模块的设计和实现方案。