论新闻报道题材与表现方式

一在任何一个新闻传播过程中,都包含着“写(报道)什么”与“怎么写(报道)”的问题。“写什么”涉及报道题材,“怎么写”涉及表现方式。在对论题展开正式讨论之前,有必要首先对几个相关概念进行辨析、界定。现今,业界和学界一些人士在论及报道题材时,     

社会制作发展探略

电视社会制作经过十年的发展，已经初步形成了一定的规模．仅北京就有超过1000家影视制作机构在从事节目制作和销售工作．并且出现了如光线、嘉实、银汉、唐龙、星美、欢乐、赛迪等颇具规模和实力的公司。而电视剧制作许可证和广播电视节目制作经营许可证的发放也为电视社会制作机构最终确立合法身份开了一个颇有希望的好头。     

博士学位论文匿名评审的成效与挑战

匿名评审已经逐渐成为中国博士学位论文评价的主流方式。由于匿名制度规避了评审的人情因素和偏见因素,总体来讲是有效的。但匿名评审也存在系统性缺陷,包括完全匿名不现实、专家遴选不匹配、评价过程不稳定、评价结果不确切、评价导向不合理等,当前很多学校实施的一票否决制又极大地放大了匿名评审的缺陷。因此,一方面要完善博士学位论文的匿名评审制度,规范盲审结果的使用,完善评审的复审程序,建立权责匹配的评审机制,加强匿名评审与公开评审的结合;另一方面,还要全面构建系统的质量保障体系,前移质量关口,完善博士培养的全过程。     

Dynamic confinement of SAPO-17 cages on the selectivity control of syngas conversion

The OXZEO (oxide−zeolite) bifunctional catalyst concept has enabled selective syngas conversion to a series of value-added chemicals and fuels such as light olefins, aromatics and gasoline. Herein we report for the first time a dynamic confinement of SAPO-17 cages on the selectivity control of syngas conversion observed during an induction period. Structured illumination microscopy, intelligent gravimetric analysis, UV-Raman, X-ray diffraction, thermogravimetry and gas chromatography-mass spectrometer analysis indicate that this is attributed to the evolution of carbonaceous species as the reaction proceeds, which gradually reduces the effective space inside the cage. Consequently, the diffusion of molecules is hindered and the hindering is much more prominent for larger molecules such as C₄₊. As a result, the selectivity of ethylene is enhanced whereas that of C₄₊ is suppressed. Beyond the induction period, the product selectivity levels off. For instance, ethylene selectivity levels off at 44% and propylene selectivity at 31%, as well as CO conversion at 27%. The findings here bring a new fundamental understanding that will guide further development of selective catalysts for olefin synthesis based on the OXZEO concept.     

Magnetically encoded 3D mesostructure with high-order shape morphing and high-frequency actuation

Inspired by origami/kirigami, three-dimensional (3D) mesostructures assembled via a mechanics-guided approach, with reversible and maneuverable shape-morphing capabilities, have attracted great interest with regard to a broad range of applications. Despite intensive studies, the development of morphable 3D mesostructures with high-order (multi-degree-of-freedom) deformation and untethered high-frequency actuation remains challenging. This work introduces a scheme for a magnetically encoded transferable 3D mesostructure, with polyethylene terephthalate (PET) film as the skeleton and discrete magnetic domains as actuation units, to address this challenge. The high-order deformation, including hierarchical, multidirectional and blending shape morphing, is realized by encoding 3D discrete magnetization profiles on the architecture through ultraviolet curing. Reconfigurable 3D mesostructures with a modest structural modulus (∼3 GPa) enable both high-frequency (∼55 Hz) and large-deformation (∼66.8%) actuation under an alternating magnetic field. Additionally, combined with the shape-retention and adhesion property of PET, these 3D mesostructures can be readily transferred and attached to many solid substrates. On this basis, diverse functional devices, including a switchable colour letter display, liquid mixer, sequential flashlight and biomimetic sliding robot, are demonstrated to offer new perspectives for robotics and microelectronics.     

电能计量装置在线故障诊断系统设计

电能计量装置运行的稳定性和可靠性,对于电力行业的发展至关重要,智能电网的建设过程中对电能表计量装置具有在线故障诊断功能的需求成为必然趋势.文中针对电能计量装置在线故障诊断系统中典型的故障诊断模型进行了研究,同时设计了在线故障诊断系统,详述了电能计量装置在线故障诊断系统硬件结构、软件框架以及系统方案,并针对在线故障诊断系...     

模糊层次分析法在电信客户满意度评价中的应用

随着经济的发展,客户的核心地位逐步显现出来。如何更好地提高客户的满意度,已成为当前商业界必须面临的问题。本文将三角模糊概念引入到层次分析法中用以确定各指标的权重,建立了客户满意度评价模型,实现了对客户满意度的评价。对商业实施有一定的指导作用。     

一种基于视频的DEW水印算法

采用差分能量水印(DEW)算法,对视频数字作品进行了数字水印的嵌入、检测和提取研究。实验结果表明,该算法计算简单、速度快、易于实现,视频信号里可编码的数据量大,可以隐藏较多的信息,并且还可以满足水印的实时嵌入和提取。     

“四史”教育融入高校思想政治工作的时代意蕴与实践指向

“四史”教育融入高校思想政治工作,具有推进高校立德树人根本任务落地落实,理想信念教育有的放矢,思想政治工作更具实效的价值意蕴。从将“四史”教育作为理想信念教育的重要内容,培养“大历史观”的有效途径,激发爱国力行的有益助推的逻辑建构出发,厘清“四史”教育融入高校思想政治工作的现实困境。高校应该结合大学生的主体特征和需求,“四史”与思政教学的内在逻辑,高校思想政治工作的目标要求,将“四史”教育融入理论武装体系、学科教学体系并构建“四史”教育制度保障体系。     

"首问责任制"与图书馆服务创新

“首问责任制”是新形势下出现的一种服务制度,文章阐述了图书馆推行“首问责任制”的意义,提出了实行该制度的措施。