摘要：Discovering highly selective catalysts is key to achieve effective CO_(2) photoreduction to hydrocarbon *** this work,we construct an ultrathin dimension-matched S-scheme Bi_(3)NbO_(7)/g-C_(3)N_(4) heterostructure,which permits the highly selective photocatalytic reduction of CO_(2) to CH_(4),as shown by 13C isotopic *** functional theory calculations combined with solid-state characterization confirm the electron transfer from g-C_(3)N_(4) nanosheets to Bi_(3)NbO_(7),establishing an internal electric *** internal electric field drives photogenerated electrons from Bi_(3)NbO_(7) to g-C_(3)N_(4),as revealed by in-situ X-ray photoelectron spectroscopy,demonstrating the presence of an S-scheme charge transfer path in Bi_(3)NbO_(7)/g-C_(3)N_(4) heterostructures allowing efficient and selective CO2 *** a result,the optimized sample achieved a CH_(4) evolution rate of 37.59μmol·g^(-1)·h^(-1),a ca.15-fold enhancement compared to ultrathin g-C_(3)N_(4) nanosheets,and also retained stability after 10 reaction cycles and 40 h of simulated solar irradiation with no sacrificial *** optimized Bi3 Nb O7/g-C_(3)N_(4) composites achieve almost 90%selectivity for CH_(4) production over CO.

摘要：随着社会的快速发展,建筑设计中的噪声控制问题越来越受到人们的广泛关注。建筑设计中的噪声控制与环保是当今社会发展的大趋势,在国家大力推进噪声控制的背景下,解决噪声问题已经成为实现和谐社会可持续发展的重要环节。本文就噪声控制在建筑设计中的几种技术方法进行了探讨,以期对建筑噪声控制和实际操作具有实用价值。

摘要：提升学生医学英语素质是当前医学院校“双一流”建设的重要路径之一。本研究以福建某医学院校医学英语教学实践为基础,聚焦内容依托式与项目依托式相融合的医学英语教学模式,分析了其教学效果。本研究提出以学科知识为核心优化教学内容、针对医学生设计以内容为依托的项目、使用真实的语言材料构建项目情境和采用内容依托式测试材料评价项目与课程效果等四个实施路径。研究通过问卷调查和半结构访谈,发现该课程教学对学生的知识获得、能力提升和素养提高等三个方面具有积极的影响。期望本研究能为我国的医学英语课程教学提供参考。

摘要：针对电主轴在实际使用、维护和维修中的测试需求,搭建适用于不同型号的油气润滑电主轴测试平台。该测试平台由电主轴辅助功能模块(电主轴支撑固定单元、电主轴控制单元、电主轴油气供给单元和松拉刀单元)和电主轴测试模块组成,结合基于VC编程的数据采集和处理等功能,可实现对不同型号、不同直径油气润滑电主轴的温度、振动、噪声等的测试,为数控机床电主轴的维护保养和维修提供了实验条件。

摘要：SECRAL (Superconducting ECR Ion Source with Advanced design in Lanzhou) is a next generation ECR ion source, and aims at developing a very compact superconducting ECR ion source with an innovative magnet design, which realizes a minimum-B trap by means of six sextupole coils external to the three axial solenoidal coils, i. e. contrary to what is usually done in any ECR ion sources. In this way, the

摘要：LECR2 (Lanzhou Electron Cyclotron Resonance ion source No.2), which was built in 1997, has been running for more than 30 000 h and provided more than one hundred kinds of ion beams for HIRFL. This ion source was considered to be one of the best ECRISs in the world when it was under commissioning because of its

摘要：LECR2 (Lanzhou ECR ion source No. 2) has been used to provide multiply charged ion beams for HIRFL cyclotron for many years. This source works at 14.5 GHz and is designed according to the high-B mode theory. Optimum design, good enough vacuum condition and the other favored conditions make this source be performed reliably and highly. Till now, the controlling of the source is still working under the long-distance manual analog controlling status.

摘要：The atomic phyiscs experimental platform was desigend based on a high performance ECR ion source and is taking the responsibility for series of experimental research concerning multiple charge state ion beams, such as atomic and material phyiscs research, study on ECR ion source and working mechanism as well as the responsibility to provide reliable experimental data of required ion beams for HIRFL accelera-