热塑性聚烯烃弹性体技术及市场分析

介绍热塑性聚烯烃弹性体的特性、生产技术及其发展趋势，对国内外市场需求进行了分析和预测。     

含时滞和Ih流的神经元的同步放电行为

本文研究了时滞和超极化激活的阳离子流Ih对抑制耦合的水蛭神经元的同步放电行为的调控.通过数值仿真揭示了时滞、耦合强度和Ih流都能诱发丰富的同步转迁行为,如从同步的周期-6簇放电到同步的周期-1簇放电.借助ISI分岔和快慢变量分离方法获得了Ih流诱导同步转迁行为的动力学原因.研究结果表明,时滞和Ih流都是影响水蛭神经元同步行为的重要因素.     

位场转换的抽样分组法

在重磁资料解释中，为了突出有用的异常，区分不同的异常源，往往要在频率域进行位场转换处理。由于转换因子具有的高频放大作用，造成了位场处理的不稳定性，因此要附加滤波器压制高频干扰。我们通过研究发现，采样点距也是决定位场处理稳定的一个重要因素。为此，提出了抽样分组法，即对离散数据进行等间距抽样重新分组，每一组作为独立的部分进行转换处理，最后将每组的结果合成，还原为要转换的结果。该法在不损失原始观测信息的     

变径烟囱的滑升模板施工技术

论述使用滑升模板的烟囱施工技术。应用这一技术使烟囱施工过程达到最佳效果。     

Feature article - Development of RTV Silicone Coatings in China: Overview and Bibliography

The development of room temperature vulcanized (RTV) silicone coatings in China began in early 1985. Over the course of time, they have come to be widely used in China. At present, nearly 800,000 kg of RTV coatings are used every year. They have successfully prevented serious pollution flashover of traditional glass and porcelain insulators and radically reduced the costs of maintaining transmission lines in polluted areas. RTV silicone coatings have been extensively studied in China. The main aspects of the research include improvements in the properties of the formula for better adhesion to porcelain and control of leakage current, the hydrophobicity transference mechanism, and aging. These decades of research have successfully promoted the development of RTV silicone coatings in China. The history of the development and research of RTV silicone coatings in China are discussed in this article.     

Influence of high-temperature air pre-exposure on mechanical strength of a directionally solidified cobalt-base superalloy

The present work investigated the influence of air pre-exposure at 850°C for 1000 h on the mechanical properties and microstructures of the directionally solidified cobalt-base alloy DZ40M. The results show that the air pre-exposure did not embrittle the alloy, but resulted in a marked strengthening. Microstructural observations and energy dispersive X-ray spectroscopy (EDS) indicates that the air pre-exposure caused a substantial external and internal oxidation, which is assumed to protect the alloy from being oxidized further and make a significant contribution to alloy strengthening, respectively. The immunity of the alloy to air embrittlement is attributed to elimination of transverse grain boundaries by directional solidification.     

固井洗井液临界密度设计方法研究

针对目前现场固井洗井液密度设计过高,严重污染地层的实际.采用固井洗井液临界密度的计算方法,降低现场固井洗井液密度,减少高密度洗井液对地层造成的伤害。固井洗井液,临界密度设计方法改变了水泥浆在失重后有效压力相当于静水柱压力的理论,综合水泥浆液柱压力和胶凝强度的影响.重新计算了水泥策候凝期间对地层的有效作用力.并通过压稳原理确定了固井洗井液临界密度计算方法。该计算方法考虑到水泥浆胶凝强度的影响.通过统计回归方法确定了理论公式.具有较强的科学依据。应用洗井液临界密度固井.能够在保证固井质量的前提下,减少由于钻井压差造成的地层伤害,又具有较强的实际操作性。便于现场监理对固井洗井液密度监督检查。     

S1240维护经验两则

介绍了S1240计费带制作失败的处理方法及S1240人机命令的跟踪方法。     

Speaker identification for security systems usingreinforcement-trained pRAM neural network architectures

Speaker identification may be employed as part of a security system requiring user authentication. In this case, the claimed identity of the user is known from a magnetic card and PIN number, for example, and an utterance is requested to confirm the identity of the user. A fast response is necessary in the confirmation phase and a fast registration process for new users is desirable. The time encoded signal processing and recognition (TESPAR) digital language is used to preprocess the speech signal. A speaker cannot be identified directly from the single TESPAR vector since there is a highly nonlinear relationship between the vector's components such that vectors are not linearly separable. Therefore the vector and its characteristics suggest that classification using a neural network will provide an effective solution. Good classification performance has been achieved using a probabilistic RAM (pRAM) neuron. Four probabilistic pRAM neural network architectures are presented. A performance of approximately 97% correct classifications has been obtained, which is similar to results obtained elsewhere (M. Sharma and R.J. Mammone, 1996), and slightly better than a MLP network. No speech recognition stage was used in obtaining these results, so the performance relates only to identifying a speaker's voice and is therefore independent of the spoken phrase. This has been achieved in a hardware-realizable system which may be incorporated into a smart-card or similar application     

现代家具结构讲座第一讲：现代实木家具结构——接合方法与技术要求

家具产品体积大、易受损，所以注重家具结构和装配方式的创新是家具设计．制造的重要内容。同时家具结构的创新也利于家具的部件化．从而实施现代化生产。 近几年来随着技术创新．家具业大量采用新材料、新配件．使家具的结构朝着更简洁、更坚固、更符合现代生产和快速物流的方向转变。根据家具结构在传统基础上创新变化的现状．本刊在今年组织了《现代家具结构讲座》．对现代实木家具、人造板家具、软体家具、其他家具的结构逐一进行介绍．以飨读者。