直流电源技术的发展方向

通过讨论直流电源技术中线性电源与开关电源的各方面特点和开关电源的发展情况，指出了开关电源是直流电源技术的发展方向．     

对提高国内银行与外资银行竞争力的思考

2001年12月11日，我国取消外资金融机构外汇业务服务对象的限制，允许设在上海、深圳、天津、大连的外资金融机构正式经营人民币业务，拉开了中国银行业正式加入世贸组织的序幕。同时，外资银行的正式进入，也为中国银行业带来了空前的竞争。本文首先分析了外资银行进入中国金融市场的主要分布特征，及其与国内银行业的主要竞争状况及竞争趋势，进而提出了国内银行业面对外资银行的冲击应采取的对策。     

自由心证与民事认证制度改革

民事认证就是法庭审查判断民事证据材料能否成为证据的过程。本从分析民事认证的概念入手．简析了民事认证制度的历史发展,并将最高人民法院《关于民事诉讼证据的若干规定》确立的认证制度总结为“证据能力判断上的法定证据制度,证明力判断上的有限心证制度”。     

论当代大学生道德建构

在中国传统教育中,我们一直强调儒家以“仁”为核心的礼乐文化的教育理念和重要作用。但是时代在变化,当代大学生道德建构还需要从其他思想中寻求工具和方法,比如道家的人格理想。     

澜沧县糯扎渡乡境内建设大型水电站给当地少数民族带来的影响

随着经济的快速发展,大湄公河次区域澜沧等地区少数民族社会、文化和经济正经历着显著变化。本文主要对国家即将兴建的澜沧江第一大电站———糯扎渡电站,可能给当地少数民族带来的影响为主线,结合思澜公路的开通,国家一级口岸思茅港等一系列重大项目的建设,在迅速地改变着已有上百年历史的传统文化。通过即将被水库淹没的几个村寨的实地调查了解,提出这种全球化的冲击和影响在给该地带来发展机遇的同时也带来了诸多问题,并就如何解决和应对这些问题作了探讨和建议。     

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．     

郭沫若早期理想人格及其内在欠缺

郭沫若在诗论的基础上提出对现代人格建设的构想。他在《三叶集》中对理想人格做了初步描述，并展现于《女神》中。但是这种理想人格无论是在诗论中还是在作品中都有肤泛之嫌。而根深蒂固的传统化的影响是造成这一现象的内在原因。     

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.