学生科学探究的自主性辨析

我国基础教育各门课程均强调科学探究,但对科学探究的界定却不甚明了,以致一些研究者片面强调学生与科学家的相似性以及学生的自主探究。通过国际研究发现,受学生认知水平、班额大小和课时等内外因素的影响,学生的科学探究需要在教师指导下进行,其指导程度应根据实际情况进行调整。     

大型压水堆核电厂给水泵配置及选型分析

根据大型核电厂的技术特点,对汽动给水泵、定速电动给水泵和带液偶变速电动给水泵进行综合技术经济分析,给出了4×33.3%带液偶变速电动给水泵作为大型核电机组的主给水系统推荐方案。     

科技进步对金融创新活动促进研究

科技与经济的协调发展,科技进步和创新已经成为世界各国推动经济可持续发展,创造最大资源配置效率的必由之路;同时科技进步在新型工业化道路中所起的作用也越来越显著。当代经济在提高实体经济效率同时,以金融创新活动为主的金融服务业对经济发展施加的影响逐渐深入。金融创新需要科技应用,金融产品需要科技及技术成果转化。文章基于以上目的,较深入地分析科技进步和金融创新活动的内在经济联系机理,并得出金融创新投资活动与科技进步互动数量关系。     

Smart responsive organic microlasers with multiple emission states for high-security optical encryption

Modern high-security cryptography and optical communication call for covert bit sequences with high coding capacity and efficient authentication. Stimuli-responsive lasing emissions with easily distinguishable readout are promising in the coding field as a novel cryptographic primitive, while the application is frequently restricted by the limited number of emission states. Here, we report a strategy of achieving multiple competitive lasing signals in responsive organic microspheres where a donor–acceptor pair was introduced. The competitive lasing from the donor and acceptor was reversibly switched by modulating the competition between the radiative rate of the donor and the rate of energy transfer, and the generated multiple lasing signals enabled a quaternary coding for recognizable cryptographic implementation. Data encryption and extraction were demonstrated using a 4 × 4 microlaser array, showing vast prospects in avoiding the disclosure of security information. The results offer a comprehensive understanding of excited-state dynamics in organic composite materials, which may play a major role in high-security optical recording and information encryption.     

议信息时代图书馆员的角色转变及素质要求

指出信息时代图书馆员的角色定位由传统的图书馆员向具有时代特色的现代化信息馆员角色的转变,并重点阐述了信息馆员应具备的信息素质,以及提高信息素质的途径。     

分众传播时代个性媒介的视觉创新

分布传播时代,新的媒体生态逐渐形成,传统媒体不再满足消费者需求,选择个性化的媒介成为一种趋势。文章通过五种意识阐述个性媒介带给我们新的视觉感受,从媒介出发进行信息沟通,利用其个性魅力传达品牌的个性。     

A CRISPR/Cas12a-empowered surface plasmon resonance platform for rapid and specific diagnosis of the Omicron variant of SARS-CoV-2

The outbreak of the COVID-19 pandemic was partially due to the challenge of identifying asymptomatic and presymptomatic carriers of the virus, and thus highlights a strong motivation for diagnostics with high sensitivity that can be rapidly deployed. On the other hand, several concerning SARS-CoV-2 variants, including Omicron, are required to be identified as soon as the samples are identified as ‘positive’. Unfortunately, a traditional PCR test does not allow their specific identification. Herein, for the first time, we have developed MOPCS (Methodologies of Photonic CRISPR Sensing), which combines an optical sensing technology-surface plasmon resonance (SPR) with the ‘gene scissors’ clustered regularly interspaced short palindromic repeat (CRISPR) technique to achieve both high sensitivity and specificity when it comes to measurement of viral variants. MOPCS is a low-cost, CRISPR/Cas12a-system-empowered SPR gene-detecting platform that can analyze viral RNA, without the need for amplification, within 38 min from sample input to results output, and achieve a limit of detection of 15 fM. MOPCS achieves a highly sensitive analysis of SARS-CoV-2, and mutations appear in variants B.1.617.2 (Delta), B.1.1.529 (Omicron) and BA.1 (a subtype of Omicron). This platform was also used to analyze some recently collected patient samples from a local outbreak in China, identified by the Centers for Disease Control and Prevention. This innovative CRISPR-empowered SPR platform will further contribute to the fast, sensitive and accurate detection of target nucleic acid sequences with single-base mutations.     

教学生活"辨

教学生活作为教学论研究的重要议题,是指教学主体在特定的时空环境中,为了生命发展和完善,以及提升生命质量、实现生命价值与意义,借助一定的中介所进行的各种生命活动。教学生活是一种特殊的社会生活,与日常生活、其他社会生活、精神生活等生活形态存在着区剐和联系,和教学实践、教学活动等相关范畴亦有所不同。     

合作素养:21世纪核心素养5C模型之五

合作是21世纪公民的必备素养,关注合作素养具有重要的现实意义。合作素养是一系列合作技能与态度的集合,涵盖愿景认同、责任分担与协商共进三个要素。愿景认同是基础,责任分担是关键,协商共进是保障。三要素相辅相成,有机融合。合作素养可以培养,如何结合中国语境,深入推进合作素养培养与评价是当前和今后的重要研究任务。