中国研究型大学的未来：领导者还是追随者？

中国扩大高等教育规模、提升高等教育质量包括建设一批世界一流大学的雄心似乎所向披靡.然而,到目前为止,中国大学受政府主导的政治文化制约,在世界舞台上主要是追随者.全球化正使得中国学术领导们日益形成共识,即大学需要不断提升独立的水平,包括学术自由水平和促进院校由内部驱动的质量控制的水平,才可能完全成熟起来,成为社会进程的领导者.只要条件允许,中国大学,尤其985院校,在未来十年可以对中国社会和经济发挥更大影响.     

Past,present, and future of WCG technology in display

We will introduce the development trend of colorant and color technology along the grown of display industry. Wide color gamut (WCG) technology with high contrast ratio and transmittance has been developed from colorant design to color filter process, product reliability, and performance enhancement. In this paper, WCG technology for liquid crystal display (LCD) and organic light emitting diode (OLED) and trend of colorant, which is including color conversion material (CCM), were discussed. We hope that it will help you to understand the development flow of colorant in the display industry.     

基于模糊控制算法电动车跷跷板的设计与实现

本文采用飞思卡尔16位单片机MC9S12DG128为核心,辅以直流电机驱动、LCD显示、加速度传感器MXD2020M、光电传感器数据采集等电路组成,实现了电动车通过黑线引导驶上跷跷板并在板上能自行调节平衡.电机控制采用了PID的控制算法,有效的减小超调量和静态误差,缩短调节时间.该模型在当代汽车行业中具有一定的实用性.     

火花放电原子发射光谱法分析镍基合金标准的对比和解析

近年来,美国材料与测试协会(ASTM)和日本工业标准(JIS)紧跟火花放电原子发射光谱分析镍基合金技术的发展,制定了该方法的分析标准。为适应发展需要,我国国家标准GB/T 38939—2020《镍基合金 多元素含量的测定 火花放电原子发射光谱分析法(常规法)》于2020年12月1日正式实施。通过对比上述3个标准的异同点,对新发布国家标准的内容进行解析,有助于标准使用者加深对标准的理解和认识。结果表明,与ASTM和JIS相应的标准相比,国家标准在仪器类型标准化和测量结果准确度方面规范更加详尽和全面;国家标准和JIS标准在仪器和分析条件的控制方面更加严谨;在样品制备和激发方面,建议国家标准尽快制定镍基合金的取样、制样标准方法;在各元素适用范围和使用波长以及对应干扰元素方面,国家标准和ASTM标准的规定各有千秋。     

A/B Architecture: Publicly Augmented Design

Architects are sometimes criticised for prioritising aesthetics over functionality; but attempts to involve end users in building design all too often encounter apathy. Is a successful participatory design process possible? Carlo Ratti and Matthew Claudel of MIT's Senseable City Lab have been researching ways to make it so. Their solutions include an adaptation of the A/B testing method used in software development, together with means from questionnaires to immersive virtual systems that can draw both conscious and unconscious public feedback while maintaining architects' central role.     

中美欧2020后减缓气候变化行动目标比较研究

作为温室气体排放量最大的三个经济体,中、美、欧2020年后应对气候变化的行动目标备受国际社会关注。本文从排放现状、目标情景、排放轨迹、累积排放、GDP碳强度、非化石能源发展等不同角度对中、美、欧的目标进行了比较,分析了中、美、欧目标和所需行动的异同。本文旨在通过比较分析更好地理解中、美、欧的目标和行动,而并非评价中、美、欧行动目标力度的相对大小。应对气候变化是一个迭代的决策过程,每个国家目标的制定需要综合考虑多方面的因素,都有一个结合具体实践不断调整和加强的过程。中、美、欧的新目标将应对气候变化的努力推到了一个更高的起点而并非行动的终点。     

基于MAD2020E加速度的0°-360°倾角传感器设计

介绍了基于MAD2020E型加速度计的0°-360°倾角传感器的基本原理,并结合实际加速度传感的特性,采用双轴无温度补偿方法进行了硬件和软件的设计。实验验证该倾角加速度传感器实现了外形小巧、精度高、智能化。     

5G应用场景与可能的技术

Fast growth of mobile internet and internet-of-things has propelled the concept formation and research on 5G wireless communications systems which are to be standardized around 2020 （IMT-2020）. There will be diverse application scenarios expected for 5G networks. Hence, key performance indicators （KPIs） of 5G systems would be very diverse, not just the peak data rate and average/edge spectral efficiency requirements as in previous generations. For each typical scenario, multiple technologies may be used independently or jointly to improve the transmission efficiency, to lower the cost, and to increase the number of connections, etc. Key enabling technologies are discussed which include massive MIMO, ultradense deployment specific techniques, nonorthogonal transmission, high frequency communications, etc.