用平面波法计算光子晶体光纤

本文讨论了平面波法在光子晶体光纤中的应用,在光子晶体光纤的横截面内选取包含芯层的一个大晶格,形成一个假想的二维周期结构,用平面波将模式磁场展开．就可以求解任意横截面光纤中的麦克斯韦方程。     

[Bmim]BF4离子液体中微波辅助制备TiO2催化剂及活性研究

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%。     

政府补贴对制造业企业绩效的影响 ——基于高技术产业和一般制造业中介效用比较研究

现有研究对于政府对制造业补贴能否提高制造业绩效存有争议。通过理论分析认为,研发投入是提高制造业绩效的有效途径,而且相比于一般制造业研发投入对高技术产业的绩效提高效果更为明显。同时研发投入需要大量资金,如果一味增加研发投入,可能挤占其他部门资金。因此,政府补贴能够通过提高企业的研发投入促进企业绩效提升,而且对于高技术产业企业绩效提升的正面影响要大于对一般制造业;并通过A股上市企业的数据进行实证研究,证明以上研究结论。这意味着政府应该对企业进行补贴,而且应该重点补贴高技术产业。     

浅析广播融媒体直播车的系统构成及功能实现

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。     

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

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].     

NiCo_2O_4纳米结构阵列的水热合成与氧析出特性研究

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。     

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

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.     

北京冬奥会推动京津冀冰雪旅游发展效应及协同推进策略研究

摘要：以冬奥会进入“北京周期”后为契机,采用文献资料和实地调查等研究方法,对北京冬奥会推动京津冀冰雪旅游发展效应及协同推进策略进行了研究。研究认为：北京冬奥会推动京津冀冰雪旅游发展的效应明显,主要表现在北京市冰雪场馆建设数量明显增加、连续举办的国际冰雪赛事和国内冰雪赛事促进冰雪旅游发展的影响力明显提升、冰雪旅游融合效应显著;天津市冰雪旅游协同发展目标明确深耕细作释放新活力效果显著、冰雪旅游民生工程建设落实有声、“冰雪旅游+文化”深度融合带来红利;河北省在滑雪场和滑冰场数量逐年提升、以张家口为核心的冰雪旅游发展区位优势明显、生态冰雪旅游发展成效显著。据此提出构建京津冀冰雪体育产业链,促进京津冀冰雪旅游产业经济生态圈建设的可持续发展;以全域旅游发展理念为引领,构建多元化的京津冀冰雪旅游公共服务体系;构建完善的京津冀生态冰雪旅游资源开发与环境保障体系的北京冬奥会推动京津冀冰雪旅游发展效应的协同推进策略。     

文化、制度与功能——武举制度的嬗变及其对武术的影响

摘要：武举制度作为封建社会统治阶级的政治工具,其兴衰存废,利弊并存。主要以文献资料法,对武举制度的历史演进进行透视和分析,反映不同时代的思想观念、文化观念和价值观念。研究表明：武举制度的创立,改变了选文不选武做官的做法,完善和发展了古代科举制度,为后世提供先例;武举选拔人才的失败,已经显示出武官选拔体制失去活力,严重影响民族身体素质的提升,阻碍武术的发展;追本溯源,我们看到历史上武人社会地位的低下,文武分途没有走向理性化,中华尚武精神由此丧失;近代民族危机加深,武举变革高涨,军事学堂的出现,直接削弱了武举制度的社会影响,导致武举制度走向终结。对当今武术发展的启示：追根溯源,打练结合,回归本真的武术,符合社会前行的基本规律,重视本土文化的积累性和变革性,在此基础上去伪存真,增砖添瓦,丰富中国武术理论体系,创新推广模式,才能应对全球化带来的挑战,实现中华武术的可持续发展。     

金属离子对UV协同过硫酸盐降解结晶紫的影响

以结晶紫为目标污染物,研究了其在UV/过硫酸盐体系中的降解动力学和机理,以及不同金属离子（Fe 0、Fe2+、Cu2+和Zn2+）对其降解动力学速率的影响。结果表明：零价铁、二价铁离子、铜离子、锌离子等金属离子对结晶紫的降解反应均有促进作用,且光降解过程遵循拟一级动力学方程;但不同金属离子对结晶紫的氧化效果不同,添加不同质量浓度的零价铁、二价铁离子、铜离子及锌离子时,其促进率的最大值分别出现在150 mg/L、10 mg/L、5 mg/L及30 mg/L,而后再增大各种金属离子的质量浓度,促进率均降低。