MOOCs offer solutions to traditional constraints faced in chemistry experimental teaching,such as limited lab space,insufficient equipment,and rigid scheduling,However,challenges like underutilization,reluctance from students,and faculty unfamiliarity can undermine these efforts.To address these issues,the National Demonstration Center for Experimental Chemistry and Chemical Engineering Education(Beijing University of Chemical Technology)has explored how to effectively use MOOCs to enhance teaching quality.The team has established an extensive array of online experimental teaching resources,implemented a synergistic blended learning model,and developed both a faculty skill enhancement program and a comprehensive system for tracking and feedback on teaching quality.These initiatives have significantly improved educational effects.

以秸秆、煤混合制成生物质燃料,用燃烧热测定装置测定不同掺混比下混合燃料的发热量,通过改变秸秆和煤的种类,探究二者混合燃烧的协同效应及在不同氧气量下的燃烧情况.结果表明,在富氧和贫氧条件下,混合燃料在特定掺混比下都会产生有利的助燃作用.红外光谱分析表明,在煤中掺混秸秆可以提高羟基和含氧官能团的含量进而促进燃烧放热.差热及热重分析表明,秸秆对于煤的燃烧具有双重作用,其DTA曲线的热效应峰面积与煤、秸秆各掺混比下的燃烧热呈正相关.

A kind of new mesoporous hydroxyapatite (noted as mesoHA) with about 2.4 nm average porous diameter was successfully prepared by casting Ca2+ and H2PO4- ions on the inner channel surface of Si-MCM-41 and dissolving the Si-MCM-41 in alkali soluble, and the porous material was used as a pH-responsive platform to adsorb and release ciprofloxacin molecules. A maximum mass of 0.51 mg of ciprofloxacin (noted as Cip) was loaded on 1.00 mg of the host, and the release rate of the drug was found increasing with the acidic increase of the external solution environment (based on the stability of mesoHA) that simulated basic composition to human plasma. About 88.5% of Cip was released from the platform when environmental pH value was about 4.8, which provides a new method on utilizing antibiotics drugs efficiently, for the host mesoHA is friendly to human body.

Laboratory safety is an important part in the process of chemistry laboratory teaching, and it is also one of the key tasks of every school at all levels.A five-in-one laboratory safety mechanism, including laboratory technology lecture, laboratory safety and environmental protection class, safety explanation and demonstration in the process of experimental project implementation, emergency evacuation drill in laboratory accidents and laboratory fire drill, has been gradually formed after many years of teaching and exploration at the Experimental Teaching Center of Chemistry, Beijing University of Chemical Engineering.These measures greatly improve the safety awareness of students in the lab class, ensure the experiment proceeded in safely and stably, and ensure a good order of campus teaching effectively.This paper analyzes the above "five-in-one" chemistry laboratory safety education teaching mode, hoping to explore how to ensure the safety of chemistry laboratory teaching with all colleagues.

How to remove excessive F- ions from water effectively is always a hot issue in academia and industry because it is very harmful to human body. In this paper, hydroxyapatite (HAP) nanoparticles with an average particle size about 10 nm, synthesized by the reaction between CaCl2 and (NH4)2HPO4 solutions under the existence of glucose as restricted domain reagent, were used as adsorbent to adsorb F-from waste water, and excellent adsorption capacity to F- of the adsorbent was possibly from its super strong surface polarity. Maximum adsorption capacity of the nanoparticles to F-in neutral aqueous solution is about 86.43 mg/g at 25℃, more than twice of HAP with average diameter about 100 nm (34.01 mg/g). 86.43 mg/g ranks the second adsorption capacity among all data reported. The adsorbent has a good application prospect in the removal of F- in aqueous solution due to its simple synthesis method, environmentally friendly characteristics and super large adsorption capacity.

<正>开展大学生学习指导,有利于提高大学生的学习成绩,实现近期学业目标和远期人生目标,也有助于提高学校的教学质量和社会声誉。在国外发达国家,作为一种专职化和专业化的制度,学习指导已经逐渐发展成较为完善的学习指导体系,对国内高校的大学生学习指导工作有很好的借鉴之处。目前,我国很多高校在学习指导方面虽然有过一些实践探索,但还没有形成一个完善的指导体系,对发达国家高等教育学习指导的内容和方法进行探索,形成适用于我国国情的学习指导体系,对我国高校大学生学习习惯的养成有重要影响,对推进我国学校教育教学改革具有促进作用。

加强对大学生学习和发展的指导,已成为国内教育界研究和探讨的一个热点.广泛开展大学生学习指导,有助于实现大学生学习目标和人生目标,也有助于提高大学的教学质量.通过分析国内大学生学习指导的主要形成和存在的问题,进而探讨我国大学生学习指导的实施策略.