[Bmim]BF₄离子液体中微波辅助制备TiO₂催化剂及活性研究     

杨艳琼  徐成东 《楚雄师范学院学报》2011,26(9):61-66

采用微波加热合成离子液体[Bmim]BF4,以该离子液体为反应介质,在微波辐射条件下制备TiO2光催化剂,在高压汞灯下用甲基橙溶液测试其光催化降解性能;并用XRD,IR,TG对其进行测试和表征。结果表明,制备TiO2光催化剂的较佳条件是:离子液体2.0mL,微波辐射功率600W、反应温度70℃、反应时间35min。并且用[Bmim]BF4作为反应介质,能够显著提高TiO2的光催化活性,所制备的TiO2不需要经过高温煅烧,就表现出极高的光催化活性。该催化剂对甲基橙的降解率在1.5h就可达到93.7%。  相似文献   

浅析广播融媒体直播车的系统构成及功能实现     

王君媚 《演艺科技》2020,(1):83-86

江苏省广播电视总台新建广播融媒体直播车,集成音视频系统,并运用无线自组网、4G传输及卫星“动中通”等通信技术组成稳定可靠的传输系统,实现可移动的融媒体直播。  相似文献   

Olivine-norite rock detected by the lunar rover Yutu-2 likely crystallized from the SPA-impact melt pool     

Honglei Lin  Zhiping He  Wei Yang  Yangting Lin  Rui Xu  Chi Zhang  Meng-Hua Zhu  Rui Chang  Jinhai Zhang  Chunlai Li  Hongyu Lin  Yang Liu  Sheng Gou  Yong Wei  Sen Hu  Changbin Xue  Jianfeng Yang  Jie Zhong  Xiaohui Fu  Weixing Wan  Yongliao Zou 《国家科学评论(英文版)》2020,7(5):913

Chang’E-4 landed in the South Pole-Aitken (SPA) basin, providing a unique chance to probe the composition of the lunar interior. Its landing site is located on ejecta strips in Von Kármán crater that possibly originate from the neighboring Finsen crater. A surface rock and the lunar regolith at 10 sites along the rover Yutu-2 track were measured by the onboard Visible and Near-Infrared Imaging Spectrometer in the first three lunar days of mission operations. In situ spectra of the regolith have peak band positions at 1 and 2 μm, similar to the spectral data of Finsen ejecta from the Moon Mineralogy Mapper, which confirms that the regolith''s composition of the landing area is mostly similar to that of Finsen ejecta. The rock spectrum shows similar band peak positions, but stronger absorptions, suggesting relatively fresh exposure. The rock may consist of 38.1 ± 5.4% low-Ca pyroxene, 13.9 ± 5.1% olivine and 48.0 ± 3.1% plagioclase, referred to as olivine-norite. The plagioclase-abundant and olivine-poor modal composition of the rock is inconsistent with the origin of the mantle, but representative of the lunar lower crust. Alternatively, the rock crystallized from the impact-derived melt pool formed by the SPA-impact event via mixing the lunar crust and mantle materials. This scenario is consistent with fast-cooling thermal conditions of a shallow melt pool, indicated by the fine to medium-sized texture (<3 mm) of the rock and the SPA-impact melting model [Icarus 2012; 220: 730–43].  相似文献   

NiCo_2O_4纳米结构阵列的水热合成与氧析出特性研究     

陈传胜  张作胜  陈伟杰  乔浏 《安徽职业技术学院学报》2020,(1):16-19,41

钴酸镍纳米材料具有良好的电催化氧析出反应(Oxygen Evolution Reaction,OER)活性,是一种很有发展潜力的非贵金属电催化材料。文章以碳纤维纸为基底,采用水热合成的方法对纳米结构钴酸镍的生长进行了系统的研究,分别考察了生长温度、前驱体浓度和配比、生长时间对产物的形貌、尺寸、物相结构、OER电化学性能的影响,通过对比分析后发现在生长温度100℃、生长时间5h、镍钴比为2:1时所获得的多孔片状钴酸镍纳米结构具有最佳的OER特性。  相似文献   

Leveraging microgrants to support capacity-building workshops in low- and middle-income countries for meeting the Sustainable Development Goals     

Karin J. Saric  Masimba Muziringa  Erin R. B. Eldermire  Sarah Young  Israel M. Dabengwa 《Journal of the Medical Library Association》2022,110(1):126

Twenty fifteen marked the year of assessment for the Millennium Development Goals (MDGs). The MDGs that achieved the greatest success were those where evidence-based practice (EBP) interventions were implemented. The ability to practice evidence-based medicine is grounded in the creation of and access to medical literature that synthesizes research findings. The role that global health literature played in the success of the MDGs demonstrates that medical libraries and librarians have a role to play in achieving the Sustainable Development Goals (SDGs).Librarians can hold capacity-building workshops that provide instruction on how to access evidence-based literature and also train health professionals to conduct synthesis research. Research findings conducted by in-country health professionals are more likely to address issues being faced by local communities and will afford the possibility of obtaining the necessary evidence-based answers that can then be used to implement policies to resolve public health issues identified in the SDGs.This paper discusses how an international team of librarians leveraged funding from a Medical Library Association/Librarians without Borders/Elsevier Foundation/Research4Life grant to hold a capacity-building workshop in Zimbabwe and follow-up online trainings. The workshop focused on accessing evidence-based resources and conducting synthesis research. Outcomes included the creation and policy implementation of evidence-based knowledge products in alignment with local needs and galvanizing a multisectoral group of key individuals who have gone on to collaborate toward the vision of creating a Zimbabwe innovation hub. Looking ahead, such grants can be leveraged to conduct capacity-building to support knowledge translation and other local training needs.  相似文献   

无线传感器网络研究   总被引：1，自引：0，他引：1  

陈员义 《科技广场》2006,(2):26-28

无线传感器网络集成了传感器、微机电系统和网络三大技术而形成的传感器网络是一种全新的信息获取和处理技术,已经成为当今的热门研究领域之一,在国防安全、工农业领域各种控制、城市管理、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等许多领域都有重要的科研价值和实用价值,具有十分广阔的应用前景。本文讨论了无线传感器网络的基本概念和一些重要研究领域,并且介绍了无线传感器网络与IPv6的可能的一些契合点,它是无线传感器网络进行大规模就用的重要议题。  相似文献   

浅论CET-4改革后大学英语听力第二课堂的开展     

蒋婷 《考试周刊》2009,(39):17-18

随着《大学英语课程教学要求》的制定和CET-4题型的改革,原有的听力教学模式已不能完全满足学生的学习需要和考试要求。大学英语听力第二课堂以其丰富的内容和灵活的形式,遂成为听力教学不可或缺的组成部分。本文重点探讨了开展大学英语听力第二课堂教学的必要性、紧迫性及具体形式。  相似文献   

QoS技术框架发展的趋势探析     

冯小欧 《河南广播电视大学学报》2012,(2):111-112

伴随网络技术、多媒体技术的飞速发展,IP网在承载现有WWW、FTP、E-mail等服务的基础上,开始越来越多地承载VoIP以及交互式多媒体通信业务,而每种业务要求的传输时延和抖动等服务参数不尽相同。因此,为用户提供服务质量(QoS)成为Internet发展的重要挑战。网络QoS技术作为公认的新一代网络的核心技术之一,是当前网络研究和开发的热点。IP QoS的研究涉及许多内容,IETF已经提供了许多服务模型与机制来满足QoS需求,典型的有:集成服务(IntServ)/RSVP模型、区分服务(DiffServ)模型、多协议标签交换(MPLS)与流量工程(Traffic Engineering)等,而ITU-T则更偏重于QoS整体框架的制定和IP性能指标体系的构建。此外,MSF(城域网交换论坛)、Internet Ⅱ和IPCablecom也提供了多种的端到端IP QoS解决方案。  相似文献   

本三院校CET4后大学英语教学现状以及后续课程设置研究——以宿迁学院为例     

霍晓静 《湖北广播电视大学学报》2013,33(2):110-111

大学英语四级后的教学到底该如何进行一直是困扰大学英语教师的一个问题。本文从一项对宿迁学院学生的问卷调查入手,对四级后学生的学习现状进行了调查分析。从后续课程设置角度看,目前的四级后大学英语教学己经不能很好的满足学生的学习需求。而多样化的四级后续课程设置既能满足学生的学习需求,也能很大程度上提高学生的语言应用能力。  相似文献   

第4届世界杯散打比赛决赛男子运动员技术特征分析     

余自华  汪海洪  杜少武 《体育科技文献通报》2009,17(9):50-52

运用文献资料、录像观察、信息技术和数理统计等研究方法,对第4届世界杯武术散打比赛决赛中男子运动员技术动作的运用情况进行统计与分析。得出结论：拳法技术使用最为频繁,但多用于试探性进攻及搂抱情况下的无效攻击,成功率较低;腿法、摔法成功率较高,是运动员得分的主要技术手段;有方向性的发展拳法技术,重点发展腿法、摔法技术,使各项技术协调发展才能真正提高取胜几率。  相似文献