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 矩形横截面试样最大弯曲应变的测量方法一般较多使用四点测量方式。但三点测量方式也有其优点,只有三测量通道。结构得以大大简化,实现自动化测量相对简单。通过推导,国家标准GB/T1040.4－2006和国际标准ISO527－4：1997附录B给出的三点式测定方法的计算公式有错误。     

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��[Purpose/significance] By using corpus-based sentiment analysis, opinion word polarity can be predicted in accordance with its context. The method is significant in applications oriented to specific-domains sentiment analysis tasks since it can improve the prediction accuracy.[Method/process] In the paper, context-oriented sentiment polarity identification for emotion expressions was investigated. A Pointwise Mutual Information(PMI) based algorithm was proposed to solve the problem. In terms of PMI, polarity of an emotion expression "feature-opinion" was inferred according to the co-occurrence of the expression with contextual opinion seed words. Furthermore, employing dependence relation analysis to detect sentimental reverse in context; with the modified PMI algorithm, we can predict polarity of emotion expressions in a sentence more accurately.[Result/conclusion] The results indicate, compared with the Lexicon-based method and the classical PMI, the modified method performs better. With it, opinion-words unlisted in lexicons can be identified, and context-specific sentimental orientation of an expression can be detected precisely as well. Modifying the macro F1 value to 0.827 and 0.878 in cater-review corpus and electronic-product review corpus separately. The algorithm, supported by large-scale domain-specific corpus and based on statistics and dependency analysis, is efficient due to convenience for data acquisition, which make it easier be applied in other domain-specific sentimental analysis tasks.     

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 金属板材的成形极限是板材成形领域中的重要性能指标和工艺参数。目前,国内外均已开展以厚度减薄率作为成形极限判据的成形极限试验模拟研究,其厚度减薄率的测试过程较为复杂,不适合实验室大批量检验工作。提出了2种金属板材拉伸厚度减薄率的测试方法,一种为人工测试断后试样断口附近厚度分布,得到厚度减薄率变化曲线;另一种方法是通过公式推导,将厚度减薄率与试样纵向应变联系起来,通过测试纵向应变,得到集中性失稳前的厚度减薄率变化规律。     

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In order to understand the effects of various iron oxides on the properties of melts, viscosity, density as well as sulphide capacities of slag system containing FeOx were summarized and discussed. It is indicated that either thermophysical or thermochemical properties would be modified accordingly with the valence change of iron oxides. Fe2+ and Fe3+ have different functions in slag. Fe2+ existed as a network-breaker, which resulted in the decreasing of viscosity and increasing of sulphide capacities with increasing addition of FeO. However, Fe3+ commonly would occupy the tetrahedron and octahedron positions, and play a network-former role, consequently, cause the viscosity of melts increasing etc. Direct investigations of slag structure or valence state of iron in the melt also support the regular patterns derived indirectly from the various physical-chemical properties. Meanwhile, these patterns of slag system including iron oxides also offer a good reference to the study of other transition melt oxides in slag system.     

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 对碟形弹簧裂纹件和原材料,采用金相检验、化学分析、硬度试验、扫描电镜等手段进行综合分析,结果表明：原材料硫化物较多,加工成碟形弹簧后,在其表面形成很多缺陷,磷化、酸洗后,在缺陷处产生氢腐蚀,长时间受力时产生裂纹。     

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 实验研究了超低碳Ti IF钢性能和析出相,结果表明：超低碳Ti IF钢具有低的屈强比、高塑性、高应变硬化性能和高成形性能,其屈强比约为0.5,抗拉强度为310 MPa,屈服强度为155 MPa,伸长率47%～50%,应变硬化指数n值为0.26～0.28,塑性应变比r值均在2.0左右,最高r值达2.25。退火织构特征均表现为较强的γ纤维织构和较弱的α纤维织构,γ纤维织构主要为{111}<110>和{111}<112>,最强点在{111}<110>处,有利的{111}取向织构使Ti IF钢具有优异的深冲性能。在超低碳钢中加入微量的Ti,形成碳化物、氮化物和氮碳化物,可以固定间隙原子（如C、N原子）,获得无间隙原子钢,同时,适量固溶Ti,能显著提高钢的深冲性能。析出相主要有Ti(N,C)及TiC ,Ti2CS, Ti3S4及很少量的AlN,而粗大稀疏的Ti2CS等析出相对晶界的钉扎力小,相应的促进了{111}再结晶织构的发展,从而获得较高的r值。     

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??OBJECTIVE To compare the in vitro dissolution of ursodeoxycholic acid capsules prepared by different grinding METHODS and screen the best grinding method. METHODS Using the large cup method, HPLC was used to investigate the similarity of dissolution behaviors between the reference preparation Ursofalk^? (the original drug) and the self-made ursodeoxycholic acid capsules in four dissolution media. The grinding method which obtained product with qualified similarity factor f₂ was determined as the best technology. RESULTS The ursodeoxycholic acid capsules made with raw material micronized by ball grinder for 3 min had similar dissolution curve to the original drug. CONCLUSION Rational preparation process is established for ursodeoxycholic acid capsules.