基于回归树与衰减函数的在线负面口碑影响力预测

影响力预测是企业在线负面口碑处理的关键环节.论文通过综合考虑信息发布者特征和信息内容特征两个维度形成特征空间,采用影响力衰减函数描述负面口碑影响力的多变趋势,提出了一种基于回归树与衰减函数的IMM-RTDF模型来预测在线负面口碑的影响力.实验结果表明,考虑信息内容特征有助于提高预测精度,同时发现用不同的衰减函数能更好地描述异质负面口碑影响力的变化趋势,进而能提高模型性能.基于此方法的在线负面口碑处理策略为企业进行客户关系管理和资源配置提供了决策支持.     

浅析实现单相异步电动机正反转的三种电路

单相异步电动机在家用电器中运用非常广泛,有些电器设备需要其电机可正反转,这就需要我们了解实现单相异步电动机正反转的原理及实现电机正反转的外部接线图,文章就该问题展开论述。     

非线性时滞系统的随机稳定化

本文讨论非线性时滞系统的随机稳定化问题。对于给定的非线性时滞系统，通过引入一个随机噪音项，可得到一个新的非线性随机时滞系统。在给定条件下，对于任意给定初值，可保证该非线性随机时滞系统具有唯一整体解，且该精确解以一般衰减速度几乎处处稳定。     

一种利用霍尔效应测量螺线磁场的新方法

给出了一种利用霍尔效应测量螺线管磁场的新方法：用数字电压表取代电位差计等诸多仪器测量霍尔电热差，进而计算出通电长直螺线管内轴向磁场的分布，实验证明，该方法测量精度高、稳定性好，克服了以往测量方法的缺点，极大地提高了实验精度和实验效率。     

一维线性Vlasov-Poisson方程组的衰减估计

研究了一类带异种电荷无碰撞的等离子体运动模型(Vlasov-Poisson方程组),在一维情况下得到了线性Vlasov-Poisson方程组的一个重要不等式,同时利用此不等式研究其解的长时间行为,并给出了相应的衰减估计.     

汉语词汇隐喻的英译策略

隐喻作为一种思维方式,体现人类的认知和文化。汉语词汇丰富的隐喻在英译时需要灵活处理,可以根据不同语境、文化内涵和隐喻的凸显程度,对其进行直译、意译、转换目标域或直译加释义。     

Three new species of free‐living marine nematodes from the Bohai Sea and Yellow Sea,China

Three new species of marine nematodes belonging to the genera Paranticoma (family Anticomidae) and Parodontophora (family Axonolaimidae) are described from the Bohai Sea and Yellow Sea. Paranticoma tricerviseta sp. nov. is similar to P. bandaenseMicoletzky and Kreis, in the spicules, but can be distinguished by the presence of a ventral projection on the spicules, three regularly arranged cervical setae in both the male and female, and two distinct ventral setae behind the anus. Parodontophora deltensis sp. nov. is close to P. paragranulifera (Timm, ) in the length of the amphids, with the ventral arm of the amphid extending past the base of the stoma, but can be separated by the ratio of dorsal arm length to ventral arm (0.36–0.55 versus 0.20–0.25) and the position of the excretory pore (at the middle level versus top level of the stoma), distinctive cervical setae arrangement and a longer renette cell. Parodontophora wuleidaowanensis sp. nov. is close to P. danker Belogurov and Kartavtseva, in the form of the amphids, but can be distinguished by the longer length of the ventral arm of the amphids and the distinctive arrangement of cervical setae.     

具阻尼和动态边界的热弹性板的指数衰减性

文章研究一个具有阻尼和动态边界条件的热弹性板的指数衰减性,运用频域方法和偏微分方程的技巧证明了所考虑弹性系统的能量是指数衰减的.     

Radioprotectors from pyrodextrins

Cornstarch heated in the range of 230–280°C depolymerized into pyrodextrins characterized by two-component EPR signals of relatively stable free radicals. These thermally generated radicals could serve as efficient scavengers for free radicals generated from pyrodextrins with the 200 Gy dose of γ-radiation. The most efficient traps/scavengers were produced from cornstarch at 250–280°C. IR data indicated incorporation of the OH groups to the pyrodextrins. These groups most probably originated from the OH· radicals formed by the radiolysis of water. EPR spectra provided evidence for trapping free radicals generated by γ-irradiation and for their subsequent annihilation on contact with pyrodextrins. Water affected radical processes occurring in pyrodextrins caused by γ-irradiation.     

自由能-氧化态图及其应用

比较详细的介绍了自由能-氧化态图的构筑及应用。