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1. chinaXiv:202001.00075 [pdf]

基于大规模古文语料库的词典构建及分词技术研究

邢付贵; 朱廷劭
Subjects: Psychology >> Applied Psychology

古文献的研究有助于传统文化的继承与发扬,而古文分词则是利用自然语言处理技术对古文献进行分析的重要环节,但由于缺少规范的数据资料而没有像现代汉语分词取得突破性进展。当前互联网拥有大量古汉语文本和词典方面的数据资料,但是这些数据分散,没有得到有效地整合。本文提出采集互联网非结构化古汉语数据,经过数据清洗和预处理抽取出一个古汉语基础词典,然后再利用互信息、信息熵、位置成词概率相结合的新词发现方法从大规模古籍文本中抽取古汉语候补词典,最终将基础词典与候补词典融合,利用正向最大匹配实现对古文的分词。与开源的分词器甲言在基于词典的分词方面比较后F值提高了14%,取得了良好的效果,结果证明本文构建的分词器可以应用在古汉语文本分词上。

submitted time 2020-01-07 Hits1069Downloads106 Comment 0

2. chinaXiv:202001.00046 [pdf]

A general self-consistent framework for studying cumulative displacement damage in nanostructured metals based on parameter passing and structural feedback between atomic and coarse-grained techniques

Xiangyan Li; Yange Zhang; Yichun Xu; Xuebang Wu; Xianping Wang; B.C. Pan; C.S. Liu; Q.F. Fang; Jun-Ling Chen; G.-N. Luo; Zhiguang Wang; X. Liu
Subjects: Materials Science >> Materials Science (General)

Nano-crystalline metals (NCs) exhibit radiation-tolerance due to the sink of grain boundaries (GBs) for radiation-induced defects such as self-interstitial atoms (SIAs) and vacancies (Vs). However, the relevant mechanisms for the radiation damage accumulation and GB structural relaxation under high radiation field in NCs are still not well understood due to the lack of self-consistent across-scale techniques for simulating radiation-induced microstructures evolution. In this article, by combining coarse-grained and atomistic simulations, we proposed a coupling method to investigate the evolution of the microstructure and SIA/V-GB interaction under cumulative irradiation in NC iron. The SIA overloaded effect was revealed in iron GBs at a high radiation dose rate and/or low temperature. Two types of GB structural response were observed to cumulative irradiation. With the SIA accumulated at the GB, the new GB phase formed and then a critical concentration of the SIA at the GB transited to the small quantity of the V during the GB structural recovery, accompanied by the local GB motion. Consequently, the GB’s role for Vs nearby alternated between the trapping and annihilation center with radiation dose. Alternatively, GB developed to a disordered structure after trapping abundant SIAs. The GB response pattern to cumulative irradiation that is related to the SIA formation energy at the GB or the GB thermal stability is well manifested in the cumulative distribution function of the defects formation energy and its energy level density. The present work reveals the dynamic healing picture for radiation damage near the GB under cumulative irradiation.

submitted time 2020-01-07 Hits937Downloads59 Comment 0

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