钢丝绯缠绕高压胶管截面经线负荷变形特性

高压胶管由含于橡胶层的螺纹状钢丝增强。该钢丝一橡胶复合层在其垂直于钢丝缠绕方向上具有有正交各向异性的弹性。以前，Ｂｒｅｉｇ对螺旋状缠绕钢丝的变形特性进行过理论和实验研究。但他未考虑橡胶层的影响，本文采用橡胶复合体理论，对于沿着由钢丝－橡胶复合层单层构成的复合园筒截面周边，给予同样压缩线负荷时变形进行了解析。对波状变形，伸长，旋转耦合变形解析得出的结果与实验结果基本一致。在此应注意橡胶层对提高高压胶     

梅州山樱花与台湾樱花花部性状的比较研究

以梅州明山自然生长的山樱花和从台湾引进并种植于明山樱花园的绯寒樱、八重樱和吉野樱为试材,对其花形、花色和花粉活力等花部性状进行了观测。结果表明,梅州山樱花的花梗较短,花瓣较小;花萼长于绯寒樱和八重樱,但明显短于吉野樱;花朵短于吉野樱而长于八重樱;山樱花与其他3种樱花的花萼、花瓣、花丝和花柱颜色有不同程度的差异。野生山樱花、绯寒樱和吉野樱的花粉活力没有明显差异;八重樱的花粉活力显著低于野生樱(p<0.01)和绯寒樱(p<0.05),而与吉野樱相比则没有显著性差异。     

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随着牙科合金在临床上使用日益广泛,其腐蚀引起的一些不良反应也日渐引起人们的重视。牙科合金的腐蚀主要为各种形式的电化学腐蚀,其主要影响因素包括合金的成分、pH值、介质的成分和异种金属等。关于提高牙科合金耐腐蚀性能的研究众多,主要为改变牙科合金的成分和表面改性。     

闭上你的嘴

“听说了吗？每个人的心里都住着一个小人。” 蔡雅偏头对我说这句话的时候,我正在纸上胡乱地勾画着。     

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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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��[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.     

桃全红型早熟新品种‘中桃绯玉’的选育

‘中桃绯玉’平均单果重150g,果面着鲜红色,全红。果肉红色素多,花青苷含量高,肉质硬,风味甜,可溶性固形物含量12.00%。果实较耐运输。花芽抗晚霜能力强,丰产稳产。在河南省郑州市,‘中桃绯玉’果实6月上旬成熟。需冷量600 h。