运用数学运算技巧突破学习物理的数学障碍

1单位换算及幂的运算单位换算,依据的是等量代换的思想。较大或较小的数常用科学计数法的形式表示,这需要熟练运用幂的运算。例152km=cm。常见的错误是:①52km=52×106km=…。②52km=52km×105cm=…。上面式子中,52km与52×105km和52km×105cm是不相等的。违反了等量代换的原则。在×105之后,单位不该是km,应该是cm。正确的过程是:因为1km=105cm,所以52km=52×1km=52×105cm=5.2×108cm。例26.4×105g=kg。常见的错误是:6.4×105g=640000×0.001kg=…由此可见,有的同学非常不习惯科学计数法的运用,很容易出现计算错误。其实掌握科学计数法的…     

高师英语专业口语教学中学生跨文化交际能力的培养

培养英语专业学生的跨文化交际能力是高等师范院校英语专业的一项重要任务。口语课作为高师英语专业的一门基础课程,在学生跨文化交际能力的培养方面具有举足轻重的作用。我们应重视文化差异对跨文化交际的影响,深入探讨在口语教学中培养学习者跨文化交际能力的方法和途径。     

Cyclic-anion salt for high-voltage stable potassium-metal batteries

Electrolyte anions are critical for achieving high-voltage stable potassium-metal batteries (PMBs). However, the common anions cannot simultaneously prevent the formation of ‘dead K’ and the corrosion of Al current collector, resulting in poor cycling stability. Here, we demonstrate cyclic anion of hexafluoropropane-1,3-disulfonimide-based electrolytes that can mitigate the ‘dead K’ and remarkably enhance the high-voltage stability of PMBs. Particularly, even using low salt concentration (0.8 M) and additive-free carbonate-based electrolytes, the PMBs with a high-voltage polyanion cathode (4.4 V) also exhibit excellent cycling stability of 200 cycles with a good capacity retention of 83%. This noticeable electrochemical performance is due to the highly efficient passivation ability of the cyclic anions on both anode and cathode surfaces. This cyclic-anion-based electrolyte design strategy is also suitable for lithium and sodium-metal battery technologies.     

土地整理后海宁市农田土壤养分空间分布格局研究

将GIS和地统计学方法相结合,以浙江省海宁市为例,分析了土地整理之后水稻田土壤pH、有机质、全氮、有效磷和速效钾的空间格局现状,绘制各要素的空间分布图.研究结果可以为了解土地整理项目实施环境影响评价以及当地的精确农业管理和防治农业非点源污染提供科学的决策咨询.     

虚拟企业的知识共享

分析虚拟企业的特点,指出了虚拟企业知识共享存在的风险,并对其如何进行知识共享进行了探讨。     

论公共图书馆的展览服务

提出了展览是当前公共图书馆服务的重要手段之一。指出公共图书馆要有展览服务意识,要树立精品意识,突出办展品位。并对图书馆如何实现社会效益与经济效益的“名利双收”进行了思考。     

试析我校评估前图书资料资产清点工作

介绍了作者所在图书馆的图书资料资产清点工作的一些经验,意在为其他馆提供借鉴。     

电气控制与PLC课程教学模式与考核体系改革的研究

以电气控制与PLC课程为研究对象,针对目前授课模式单一、教学组织形式有限、考核体系陈旧、学生动手实践少、考核体系不科学等弊端,提出了线上线下混合式教学模式和基于泛雅平台构建考核体系.阐述了混合式教学的教学方法和考核体系的改革方案.     

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.