Attentional negativity bias moderated by positive mood arousal

Automatically allocation of more attention to negative stimuli is called emotional negativity bias. An event-related potentials (ERPs) experiment investigated whether or not this bias was altered by positive mood arousal. The results suggested that the attention bias towards negative stimuli was attenuated when positive information was accessible.     

地方高校“播音与主持艺术专业热”透视

新世纪以来,伴随着“艺考”的升温,中国高等教育出现了前所未有的“播音与主持艺术专业热”.具体表现在开设高校增多、报考学生数量庞大、专业规模迅速膨胀和专业培训红火等方面.专业门槛相对较低、专业收费相对较高、传媒业的迅猛发展、播音与主持人的明星效应等是导致“播音与主持艺术专业热”的主要原因.只有政府、学校、家长、学生共同面对,才能使“播音与主持艺术专业热”降温,从而回归正常轨道.     

Teeming stream protection using an argon shroud during casting of steel ingots

Two kinds of argon shroud protection devices with two different basic structures were designed and investigated. Industrial experiments and numerical simulations were used to examine the protection effect, and the mechanism of air entrapment during the casting of steel ingots was analyzed. The influence of the structure of the argon shroud protection device on the protection effect was investigated. An argon shroud protection device mounted to the nozzle holder on the bottom of the ladle does not provide a good protection effect because air can easily flow into the teeming system and cause reoxidation of molten steel during teeming. By contrast, an argon shroud protection device seated on the top of the central trumpet provides an excellent protection effect, where air has little chance of flowing into the teeming system during casting. The feasibilities of the argon shroud protection devices are discussed.     

T-S 模型输入饱和扰动抑制及在Lurie 系统中的应用

研究了一类输入饱和T-S 模糊系统的扰动抑制问题。采用分区讨论与大中取大综合方法处理饱和项，利用Lyapunov 稳定性理论，提出了非线性系统的执行器饱和控制器存在的充分条件，进一步对控制器进行了优化，以实现扰动抑制要求。通过简单变换，将该条件转化为Matlab 易于求解的线性矩阵不等式。最后对鲁里叶(Lurie)系统的控制仿真验证了方法的有效性。     

电磁感应浮力演示装置实验分析

通过交流电电磁感应浮力演示装置实验,定性地测试出电磁感应浮力演示装置的磁场分布。运用楞次定律和法拉第电磁感应定律,从电磁学知识角度对电磁感应浮力实验现象进行理论上的分析。运用力学知识,对电磁感应环进行受力分析、速度分析、位移分析、影像记录比较分析和材料特性比较分析等。比较全面地探索了电磁感应浮力的规律,明确地提出了优化＂磁悬浮＂效果的设想。研究的成果可供教学、科研及技术应用参考。     

西归中阿魏酸和佛手柑内酯提取工艺研究

目的:优选西归中阿魏酸和佛手柑内酯的提取工艺。方法:采用超声提取,分别通过单因素试验和L(934)正交试验,研究了提取次数、提取时间、提取温度和固液比四个因素对阿魏酸和佛手柑内酯含量的影响。结果:最佳提取工艺为A3B2C1D2,即提取次数为3次,提取时间为50 min,提取温度为55℃,固液比为1∶5。结论:该工艺简便、可靠,可为西归的进一步开发利用提供参考。     

楚调“唐音”歌吟源流及其基本特点

楚凋“唐音”歌吟是我国传统吟诵众多流派中的一个重要分支，文章阐述了楚调“唐音”歌吟（江西省级非物质文化遗产）的源流，并对其基本特点进行归纳与总结。楚调“唐音”歌吟可吟多种诗词体裁，且在同一首诗（词）中可分别采用如歌、如诉、如泣三种吟唱模式，为丰富吟诵音乐形态的地域研究提供参考。     

T611型卧式镗床精化改造分析

国产60—70年代的T611型卧式镗床大多因原结构性能和多年使用的原因，有必要进行精化改造。本文分析了T611型卧式镗床存在的一些弊端，并从数显改造等方面有针对性的介绍了一些精化改造的措施和方法，同时分析了改造后所具有的性能特点。     

Research on catalysis of sodium-metallochlorophylls in Ni/MH battery

The effects of sodium-metallochlorophylls including sodium-iron chlorophyllin, sodium-copper chlorophyllin and sodium-magnesium chlorophyllin on performance of Ni/MH battery were investigated. The results show that sodium-iron chlorophyllin can effectively activate the gases produced during charge in Ni/MH battery, therefore reducing the reduction potential of oxygen and the oxidation potential of hydrogen, and the increased speed of inner pressure of battery is decreased significantly. With the aid of DMol3 software, the activation process of oxygen and hydrogen by sodiummetallochlorophylls was simulated and analyzed. It was found that the catalysis behavior is in agreement with the experimental results, and the activation process also gets a reasonable explanation from the calculated results.     

耶鲁大学图书馆信息服务最新进展及启示

耶鲁大学图书馆是仅次于哈佛大学的美国第二大大学图书馆。对耶鲁大学图书馆信息服务的最新进展进行了分析和研究,借鉴耶鲁大学图书馆的经验,指出了我国大学图书馆信息服务发展的4个方向。