电源变压器优化设计及应用

本文建立了电源变压器以体积最小为优化目标的优化设计数学模型，并对其优化方法给予了探讨和实例计算。从实例中揭示了优化设计给电源变压器设计的技术性、经济性所带来的深刻变化和重要意义。     

论宋代枢密使之势衰

枢密使一职始置于唐后期,以宦官充任,五代时改由士人充任,后又逐渐被武臣所掌握,办事机构也日益完善。为适应连年战争的局面,枢密使把军政大权握于一己之手以便宜从事,枢密使的职掌范围扩大到了极限,枢密使的地位迅速上升,"权侔于宰相"。但到了宋代,枢密使制又发生了变化,其任职者由五代时的武将逐渐转为以文官担任,职权范围逐步缩小。文章试图厘清宋代枢密使权势变化及其原因。     

BCH-代数元素的幂与周期

在BCH-代数中引入元素幂与周期的概念，并对元素幂与周期的性质进行了研究，得到了一些结果．     

论西方自由心证制度的理念与基础 ——兼论我国认证制度的现状和改革方向

文章从自由心证的涵义入手,探讨了自由心证的基本理念和基础,分析了我国学者对自由心证制度的评价。并结合我国的证据规则,指出我国目前的认证制度符合我国的国情,但同时要把建立自由心证制度作为认证制度改革的目标。     

降低干式变压器噪声的措施

分析了引起干式变压器噪声的主要因素 ,提出了降低干式变压器噪声的有效措施     

论"知识就是力量"

分析了知识为什么是力量,知识是什么力量,什么知识才是力量,知识怎样才能转化为力量;论述了应该如何辩证地理解"知识就是力量"并在行动中实践这句名言.     

快速分解算法的电力系统状态估计软件研究

电力系统状态估计作为一种高级应用软件,在整个能量管理系统中起着非常重要的作用。本文采用了基于加权最小二乘法的快速分解状态估计算法,并建立了相应的数学模型,该模型具有简便快速的特点,经实例计算表明,该方法是可行的。     

Study on EEG power and coherence in patients with mild cognitive impairment during working memory task

To investigate the features of electroencephalography (EEG) power and coherence at rest and during a working memory task of patients with mild cognitive impairment (MCI). Thirty-five patients (17 males, 18 females; 52～71 years old) and 34 sex- and age-matched controls (17 males, 17 females; 51～63 years old) were recruited in the present study. Mini-Mental State Examination (MMSE) of 35 patients with MCI and 34 normal controls revealed that the scores of MCI patients did not differ significantly from those of normal controls (P＞0.05). Then, EEGs at rest and during working memory task with three levels of working memory load were recorded. The EEG power was computed over 10 channels: right and left frontal (F3, F4), central (C3,C4), parietal (P3, P4), temporal (TS, T6) and occipital (O1, O2); inter-hemispheric coherences were computed from five electrode pairs of F3-F4, C3-C4, P3-P4, T5-T6 and O1-O2 for delta (1.0～3.5 Hz), theta (4.0～7.5 Hz), alpha-1 (8.0～10.0 Hz), alpha-2 (10.5～13.0 Hz), beta-1 (13.5～18.0 Hz) and beta-2 (18.5～30.0 Hz) frequency bands. All values of the EEG power of MCI patients were found to be higher than those of normal controls at rest and during working memory tasks. Furthermore, the values of EEG power in the theta, alpha-1, alpha-2 and beta-1 bands of patients with MCI were significantly high (P＜0.05) in comparison with those of normal controls. Correlation analysis indicated a significant negative correlation between the EEG powers and MMSE scores. In addition, during working memory tasks, the EEG coherences in all bands were significantly higher in the MCI group in comparison with those in the control group (P＜0.05). However, there was no significant difference in EEG coherences between two groups at rest. These findings comprise evidence that MCI patients have higher EEG power at rest, and higher EEG power and coherence during working conditions. It suggests that MCI may be associated with compensatory processes at rest and during working memory tasks. Moreover, failure of normal cortical connections may be exist in MCI patients.     

深化高等教育改革的动力分析

任何改革都需要动力，只有认真分析和探讨高等教育改革的动力，寻求对策，才能将高等教育的改革与发展顺利推向前进。     

夫妻权力分配模式对青少年发展的影响研究

以核心家庭为研究对象,分析丈夫主导、妻子主导和夫妻平权三种夫妻权力分配模式对青少年发展的影响。研究发现夫妻平权模式更加普遍,家庭事务决策方面“男主外、女主内”的二元模式仍清晰存在。不同家庭特征下夫妻权力模式存在差异:当子女性别为女且为京户,妻子受教育程度不低于丈夫时,妻子在家庭权力分配中具有更高地位;反之,则丈夫具有更高权力地位。学业方面,丈夫主导型家庭更易出现学业成绩领先的青少年,但也容易出现学业落后的情况;妻子主导型家庭中成长的青少年表现出中下等学业成绩的概率较大。在社会适应和人格方面,平权家庭中青少年较妻权家庭往往伴随更高的社会适应水平,在谨慎性、开放性人格维度上显著高于夫权家庭。