Proximal advantage in knowledge diffusion: The time dimension

This paper intends to explore the impact of geographic proximity on the diffusion of knowledge in the form of publication citations, and argues that codified knowledge is transmitted faster in proximity and is subject to similar geographic constraints as tacit knowledge. The geographic proximity advantage would be particularly relevant in the early stage of dissemination. We collected three sets of research articles published in 1990, 2000 and 2010 and compared the longitudinal citations they received domestically and from abroad. The study found that domestic citations accumulate faster and reach their peak much earlier than foreign citations, and the difference is most evident in the first few years after publication. The result shows that geographic proximity does play a role in the speed of knowledge diffusion and points to the network effect for citations. Those located closer to the knowledge origin would be exposed and react to publications faster due to the additional opportunities of research exchange and network.     

光合作用与诺贝尔奖

光合作用（photosynthesis）是绿色植物吸收阳光的能量,同化CO2和水,制造有机物并释放氧的过程.可用下面的方程式简单表示：[第一段]     

加强大学生的科学素质教育

在国家大力实施科教兴国战略、建设创新型国家的宏观背景下,如何把科学素质教育切实地贯穿到高校素质教育的实践之中,促进大学生的全面发展,是一个值得深入研究和探讨的重要课题.     

Rollback,scissor-like closure of the Mongol-Okhotsk Ocean and formation of an orocline:magmatic migration based on a large archive of age dataOA

Tracing the closure of oceans with irregular margins and the formation of an orocline are crucial for understanding plate reconstruction and continental assembly.The eastern Central Asian Orogenic Belt,where the Mongol-Okhotsk orocline is situated,is one of the world’s largest magmatic provinces.Using a large data set of U-Pb zircon ages,we updated the timing of many published igneous rocks,which allowed us to recognize tightly ’folded’ linear Carboniferous-Jurassic magmatic belts that wrap arou...     

High-entropy-alloy nanoparticles with 21 ultra-mixed elements for efficient photothermal conversionOA

Multi-metallic nanoparticles have been proven to be an efficient photothermal conversion material, for which the optical absorption can be broadened through the interband transitions(IBTs), but it remains a challenge due to the strong immiscibility among the repelling combinations. Here, assisted by an extremely high evaporation temperature, ultra-fast cooling and vapor-pressure strategy, the arc-discharged plasma method was employed to synthesize ultra-mixed multi-metallic nanoparticles compose...     

Identification of twist-angle-dependent excitons in WS2/WSe2 heterobilayersOA

Stacking atomically thin films enables artificial construction of van der Waals heterostructures with exotic functionalities such as superconductivity, the quantum Hall effect, and engineered light-matter interactions.In particular, heterobilayers composed of monolayer transition metal dichalcogenides have attracted significant interest due to their controllable interlayer coupling and trapped valley excitons in moiré superlattices. However, the identification of twist-angle-modulated optical tr...     

基于供需双向服务的共享仓储配送路径优化

共享仓储是"制造业+互联网+共享经济"智能制造大背景下,通过集成智能仓库产品与专业化的"集中采购+智能存储+JIT配送"服务于工业园区.针对园区企业与共享仓储之间的供需双向服务的物流特征,需要考虑在交货硬时间窗、运输小车承载量和小车数量等约束条件下较优的配送路径问题.首先,建立了共享仓储配送路径优化数学模型,并采用车辆...     

现代科技期刊的稿流

稿流是物流在知识创新和传播领域中的特殊形式,而现代稿流则是基于信息化网络平台,全面集纳稿件挖掘、编辑出版、发行推广等多目标的办刊思想、稿件处理体系及新型出版机制.针对科技期刊,阐述现代稿流所具备的开放性系统、个性化服务、标准化生产、信息共享等特点,以及稿源挖掘、文稿供应、稿件管理、审查与商修、整理加工、数字出版与推介、学习型组织平台等7大功能.现代稿流将办刊活动纳入整个社会科技传播的大范畴之中,将推动科技成果的生产与传播.     

基于浏览行为和浏览内容的用户兴趣建模

面对因特网的海量信息，为了更好地实现基于用户兴趣的个性化信息服务，提出一种隐式地获取用户兴趣模型和更新用户兴趣模型的方法。这种方法不需要用户显式地提供兴趣信息，只需要用户浏览页面时的动作和浏览的内容来获取有用的信息，随后利用这些信息建立和更新用户兴趣模型。该模型能较好地描述用户的兴趣类型及兴趣度，提高个性化信息服务的效率。     

新时期对图书馆学研究方法的创新探索——学科外延与内涵深入的整合研究法

随着科学技术的发展,网络环境的变化,传统的图书馆学理论思想已经不适应当今的图书馆发展模式,原有的研究方法也不适用于新形势下的图书馆学研究。因此,图书馆学的研究方法必须突破传统的束缚,将图书馆学理论外延化和内涵深入性两方面进行有机整合研究,将是未来图书馆学理论研究的发展导向,这样才能更好地推动图书馆学的理论观点不断发展创新。