共找到 1,259,866 条论著文献

1、Characterization of viral RNA splicing using whole-transcriptome datasets from host specie 2018

2、Evaluation of light extraction efficiency for the light-emitting diodes based on the transfer matrix formalism and ray-tracing method*Project supported by the National Natural Science Foundation of China (Nos.11574306, 61334009), the China International S 2016

摘要:1 online resource Abstract: The internal quantum efficiency (IQE) of the light-emitting diodes can be calculated by the ratio of the external quantum efficiency (EQE) and the light extraction efficiency (LEE). The EQE can be measured experimentally, but the LEE is difficult to calculate due to the complicated LED structures. In this work, a model was established to calculate the LEE by combining the transfer matrix formalism and an in-plane ray tracing method. With the calculated LEE, the IQE was determined and made a good agreement with that obtained by the ABC model and temperature-dependent photoluminescence method. The proposed method makes the determination of the IQE more practical and conventional.
展开
选择 引用 收藏

3、Global financial crisis and China’s pawnbroking industry

摘要:In most countries, pawnbroking is an intermediate financial instrument to help private households or individuals meet their short-term and urgent consumption needs. In China, due to market imperfection and institutional discrimination against the small and medium-sized enterprises (SMEs) by commercial banks and other formal financial institutions, pawnbroking has been used as a supplementary financing source for SMEs and private entrepreneurs when they cannot get access to bank credits or other financial sources such as usury (underground money shops). This paper uses first-hand survey data in 2009 in Zhejiang Province, China’s pioneering region for pawn business, and secondary data for the whole country during 2004-12, to understand the special characteristics of the pawnbroking industry and explain why it has become a viable and useful financing instrument in China. It also explains the puzzle of a serious setback and widespread losses in the industry during the world financial crisis. A corporate financing model of SMEs is developed to explain the substitution relationship between formal bank credits and pawnbroking. It suggests that the stimulus plan implemented by the central government of China during the global financial crisis reduced the borrowing cost and lowered the access barrier of bank credits to SMEs, leading to a temporary setback of an otherwise rapidly growing pawnbroking business in 2008 and 2009. However, as quantitative easing is gradually phased out after the global financial crisis, pawnbroking activities recover rapidly, implying that the industry will continue to play an important role in China’s economic development given its current financial system which is still unfriendly to the SME sector.
展开
选择 引用 收藏

4、火车来了要注意些啥 1952/9

5、煤直接液化制混合芳烃 2018/7

6、New Digital Infrastructure, Cross-Border E-Commerce and Global Vision of Creating Electronic World Trade Platform 2018

7、液压传动 聚氨酯密封件尺寸系列 2018/7

8、龙宫借宝 1953/4

9、同步测试卷 2018/12

摘要:本选题内容与现行教材同步,切合中学生各阶段的知识与能力水平,突出基础性、针对性和拓展提高性。选题内容与教材单元同步设置,每个单元分四套试卷:前三套试卷以本单元的相应话题为编写单位,着重体现课本上的基础知识;第四套试卷是对该单元整体内容的检测和系统知识的提升。除此之外,各设置一套期中、期末测试卷,让学生在整体把握相关单元知识的基础上,进一步巩固和提升对所学知识的理解和掌握程度。题目上由易到难,层层递进,题型上严格依据中考模式编写,让学生既能在巩固所学课时的基础上科学检测知识水平,又能为中招考试打下基础,提高应试能力。
展开
选择 引用 收藏

10、我们身边的变变变 2018/12

摘要:书稿以改革开放以来中山市民身边的30多个小侧面切入,以小见大折射了中山以至珠江三角洲40年发生的巨变,包括衣、食、住、行、通讯、教育、工农业及第三产业发展、社会福利等方方面面的成就,图文并茂,把改革开放带给人民群众的获得感形象化地跃然纸上,热情讴歌了党的英明领导和富民政策。
展开
选择 引用 收藏

11、美学基础 2018

摘要:本书为艺术设计系列。《美学原理》着重介绍了什么是美学、西方美学史上对美的本质的探讨、中国美学史上对美的本质的探讨、美的本质的初步探索等内容,并强调理论与实践、历史与逻辑、抽象与实证、概念与形象的统一,旨在通过系统的理论学习,使学生掌握必要的美学知识,并在此基础上形成一定的审美分析能力,以益于学生的审美实践发展。
展开
选择 引用 收藏

12、Promotion of electron confinement and hole injection in GaN-based green light-emitting diodes with a hybrid electron blocking layer 2015

摘要:1 online resource Abstract: The InGaN/GaN green light-emitting diode (LED) with a hybrid electron blocking layer (HEBL) formed by partially incorporating a small amount of indium in the AlGaN conventional electron blocking layer is proposed. Influence of the HEBL is investigated both experimentally and theoretically. By fitting the quantum efficiency with the modified ABCD model, these coefficients' values are obtained and the reduced value of D suggests that the HEBL can weaken the carrier leakage. Subsequent simulation shows that the proposed design builds up two higher potential barriers for electrons and one lower potential barrier for holes, which could effectively enhance electron confinement and hole injection. Therefore more carriers could be restricted in multiple quantum wells and participate in radiative recombination. As a result, the measured light output power of the proposed LED is 80% higher than that of the reference LED at a current of 150 mA and its external quantum efficiency droop ratio is also smaller.
展开
选择 引用 收藏

13、一轮复习单元滚动双测卷 2019/2

摘要:本书针对高三一轮复习备考使用,全书共分为32套专项卷,16套单元卷,单元内设专项突破卷、基础达标卷和滚动提升卷,通过“专项+双测”模式,使解题能力从基础到综合分层稳步提升,再通过2套终结卷达到综合测试和拔高的要求。按照专项卷→基础卷→提升卷→终结卷,考点从基础到综合。并配备标准答案与评分标准。
展开
选择 引用 收藏

14、慕名而来 2018/12

摘要:老字号对一些经营理念的注重、对一些细节的坚守,在百年的时光中沉淀为某种气质,成为城市文化的一部分,消费者品味的是产品和服务,同时这是一种文化、一种记忆。同时,这种商业文化连同它对消费者的影响力,也会对今天的年轻企业形成一种示范作用。2006年,北京有67家企业(品牌)入选国际商务部认定的首批中华老字号。时隔十余年,这些被命名的“老字号”企业在品牌的“承前启后”方面坚守着哪些老传统、开创了哪些新做法?特别是在互联网对经济模式和商业文化产生深刻影响的这一时期,根植于北京的历史文化之中,而今面临着古老与现代、东方与西方文化的交融与碰撞,“中华老字号”经营理念的传承、品牌文化的传播为我们提供了一个近距离观察文化流动的视角。 本书即对上述内容加以阐释,让读者更深入地了解北京老字号。
展开
选择 引用 收藏

15、国家管辖外海域生物多样性养护与可持续利用 2018/12

摘要:根据《联合国海洋法公约》的规定,国家管辖范围以外区域在地理范围上包括公海和国际海底区域,但不包括南极条约体系规定的范围,占全球海洋面积的64%,攸关各国的生存和发展空间,是当前各国竞相竞争的战略新疆域。国家管辖范围以外区域海洋生物多样性(BBNJ)国际文书谈判是当前海洋法领域最重要的国际立法进程。该国际文书被视为《公约》第三个执行协定,涉及海洋遗传资源的获取和惠益分享、海洋保护区等划区管理工具、环境影响评价、能力建设和海洋技术转让等重要问题,攸关海洋新资源和海洋活动空间等战略利益,牵动国际海洋秩序的调整和变革,各国对文书谈判予以高度重视。 为了帮助学界和管理部门及时了解BBNJ问题相关情况,推动相关研究不断深入,有关研究人员编写本书旨在反映阶段性研究成果。相信本书对于国内学者进一步研究BBNJ问题具有重要的参考价值。
展开
选择 引用 收藏

16、邢台非遗文化 2018/12

摘要:邢台位于太行山前台地,域内各县市区保存着丰富的非物质文化,这些文化是一个地域特有的文化现象,有传统的音乐、还有舞蹈和体育,及传统技艺等等。《邢台非遗文化》是一部全面介绍邢台非物质文化遗产的普及性读物,本书图文并茂,系统的叙述邢台区域的非遗文化历史及传承发展,是了解、推介邢台非物质文化遗产的普及性读物,具有一定的收藏和区域文化研究等方面的价值。
展开
选择 引用 收藏

17、海葬 : 台湾作家王拓小说选 1983

18、情趣二重奏的训练与演奏 2018/12

摘要:本书针对琴童在小提琴学习过程中,每个阶段需要解决的技术难点而编写。在练习方式上,有突破性的选择了两位琴童共同配合,共同练习的方式,在互动中提高演奏技巧。在小提琴学习的过程中,互相配合的方式既增加了练习的趣味性,同时还能以他人为鉴,从而更好的认识到自己的问题所在,更为重要的是:不断增强与人协同演奏的能力,将有助于提高学习者的节奏、音准、音乐感受力等方方面面的音乐基本素养。
展开
选择 引用 收藏

19、不忘初心 牢记使命 水惠民生 2018/11

摘要:笔墨春秋写华章,书画气韵歌盛世。为深入学习宣传贯彻党的十九大精神,推进水利系统精神文明建设和文化建设,展示水利人文化自信,激发广大水利干部职工凝神聚力、锐意进取、奋力前行的积极性,助力新时代中国特色水利现代化事业新发展,2017年11月20日,在水利部文明办的指导下,水利政研会与水利文协联合启动了“不忘初心、牢记使命、水惠民生”——全国水利系统学习贯彻党的十九大精神主题美术书法摄影作品征集活动。
展开
选择 引用 收藏

20、Taiwan wenxuejia cidian 1991

结果集较大,只显示前20,000条数据。修改检索词或筛选条件获取更精准结果。