基于“固结词串”实例的中文分词研究

近几年的中文分词研究中,基于条件随机场(CRF)模型的中文分词方法得到了广泛的关注。但是这种分词方法在处理歧义切分方面存在一定的问题。CRF虽然可以消除大部分原有的分词歧义,却会带来更多新的错误切分。该文尝试找到一种简单的、基于“固结词串”实例的机器学习方法解决分词歧义问题。实验结果表明,该方法可以简单有效的解决原有的分词歧义问题,并且不会产生更多新的歧义切分。     

An all-optical 2R regenerator using a compact self-seeded Fabry-Pe/spl acute/rot laser diode incorporated in a bidirectional EDFA

An all-optical 2R regenerator, based on a compact self-seeded Fabry-Pe/spl acute/rot laser diode with a 10-mm-long embedded fiber Bragg grating cavity, and a bidirectional erbium-doped fiber amplifier, is proposed and experimentally demonstrated to execute all-optical 2R regeneration at 10 Gb/s. Compared with the conventional 1R regeneration, the proposed scheme has achieved significant 6.4-dB improvement of power penalty at bit-error ratio =10/sup -9/ in the transmission experiment over 100-km standard single-mode fiber.     

基于MC9S12DP256的AMT系统的设计

AMT(机械式自动变速器)是在机械式变速器的基础上发展起来的一种自动变速器,文章对其工作原理及结构组成进行了简要介绍,并且完成了以MC9S12DP256微控制器为核心的电子控制单元的硬件系统设计,通过在AMT中应用MC9S12DP256来实现对AMT系统的控制。同时系统中采用Freescale公司的高端驱动芯片MC33289来实现对电磁阀的驱动,系统结合自身CAN模块,选用Philips公司的PCA82C250设置了CAN的接口电路,用于故障码的传输以及与其他系统之间进行CAN通讯。     

分布式光纤温度传感器的设计

分布光纤温度传感器是一种比较新型的传感器系统,它可以实时测量空间温度场的分布。在对功率调制型光频域喇曼反射光纤温度传感器的研制过程中,利用直接数字合成芯片AD9859作信号源,通过测量激光功率波形和反斯托克斯喇曼反射信号波形的振幅和相位,经过优化设计,在6KM的系统中空间分辨率达到了1米。     

Existing State and Partitioning of Rare Earth on Weathered Ores

The existing state and partitioning of rare earth （RE） on weathered ores in Longnan County（LN）, Xingfeng County（XF） and Ninghua County（NH） were characterized systematically by standard geological analytical methods. It is found that RE in the weathered rare earth ores exist as four phases： （a） water soluble, （b） ion-exchangeable, （c） colloidal sediment （oxides）, （d） minerals, in which mainly as ion exchangeable phase, accounting for nearly 80% of total RE, with about 20% in the form of colloid sediment phase and mineral phase, but very little as aqueous soluble phase. These rare earth partitioning were mainly chosen mid-heavy RE elements, occupying above 60%, but not equal in the four phases. The mid-heavy RE elements were primarily enriched in the ion exchangeable phase up to 40%, while the containment of cerium dioxide is below 2 %. The cerium deficiency occurs in the ion exchangeable phase in weathered ore. It results from that the Ce^3＋ is oxidized into Ce^4＋ and changes into CeO2. For LN ore, the containment of Y is high in weathered ore because Y-minerals are abundant in original rock.     

Attachment, Self-Esteem, Worldviews, and Terror Management: Evidence for a Tripartite Security System.

On the basis of prior work integrating attachment theory and terror management theory, the authors propose a model of a tripartite security system consisting of dynamically interrelated attachment, self-esteem, and worldview processes. Four studies are presented that, combined with existing evidence, support the prediction derived from the model that threats to one component of the security system result in compensatory defensive activation of other components. Further, the authors predicted and found that individual differences in attachment style moderate the defenses. In Studies 1 and 2, attachment threats motivated worldview defense among anxiously attached participants and motivated self-enhancement (especially among avoidant participants), effects similar to those caused by mortality salience. In Studies 3 and 4, a worldview threat and a self-esteem threat caused attachment-related proximity seeking among fearful participants and avoidance of proximity among dismissing participants. The authors' model provides an overarching framework within which to study attachment, self-esteem, and worldviews. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

硅纳米管的研究进展

元素硅是sp3杂化,而不是易于形成石墨管状结构的sp2杂化,所以具有这种sp3杂化键的物质难于形成中空一维硅纳米材料,即硅纳米管.综述了硅纳米管及性能的理论研究,同时论述了采用模板法合成硅纳米管的最新实验进展情况,指出了目前硅纳米管的研究中需要解决的一些问题,并展望了发展.     

热能表检测中对热水流量装置的要求

本文结合自行研制的热能表检测装置,详细论述了热能表检测过程中用到的标准设备———热水流量标准装置所需计量设备的内容、要求、以及工艺细节。针对实际使用中的热能表检测装置存在的问题进行了分析,并给出了测量不确定度的分析方法。