高校德育可行性实效性途径研究

德育途径是为了实现一定的德育目标,通过一定的渠道和德育方法、内容实现的。根据高校德育特点,采用综合性多途径的德育方法和措施,使高校德育工作更加贴近实际、贴近学生,从而提高德育可行性、实效性。     

大学生信息检索能力调查分析

以大学本科生为研究对象,通过对他们在信息检索过程中使用工具和检索结果判断依据的调查探寻现今本科生信息素养的状态及其改善手段。通过实地问卷调查的方法,最终在北京大学回收了259份有效问卷。经过严格的数据清洗,使用描述统计和拟合优度分析的结果显示:本科生检索方法手段单一;使用搜索引擎查找生活、娱乐类信息,对搜索引擎的易用性的判断高于OPAC和数据库;无论是检索字段的使用还是对检索结果的判定,其所凭借和依据的字段或内容均很少。针对信息检索教育培训的力度不足的现状,提出从搜索引擎的使用入手,在日常的教学中引导学生养成良好的信息获取习惯并辅以一定的教育和训练是改善这种现状的可能手段。为了解大学生信息素养的现状提供了一手分析结果,同时为改善大学生信息素养现状提出了建设性的意见。     

大学图书馆知识挖掘及其流程的研究

本文以实用性、创新性、科学性、时效性为原则,立足于大学图书馆的未来发展,探讨大学图书馆知识管理与知识服务中的知识挖掘及其流程;结合图书馆实际情况提出了双库协同机制,并对双库协同机制的具体实现进行了说明。     

国外学者对三星堆文化的研究

本文从三星堆文化的起源、三星堆祭礼坑的年代与功用和三星堆文化来源三个方面详细论述了国外学者进行三星堆文化研究的现状及存在的不足,同时也指出国外学者在三星堆文化研究上可供国内学者借鉴和参考的方面.     

Mobility in China, 2020: a tale of four phases

2020 was an unprecedented year, with rapid and drastic changes in human mobility due to the COVID-19 pandemic. To understand the variation in commuting patterns among the Chinese population across stable and unstable periods, we used nationwide mobility data from 318 million mobile phone users in China to examine the extreme fluctuations of population movements in 2020, ranging from the Lunar New Year travel season (chunyun), to the exceptional calm of COVID-19 lockdown, and then to the recovery period. We observed that cross-city movements, which increased substantially in chunyun and then dropped sharply during the lockdown, are primarily dependent on travel distance and the socio-economic development of cities. Following the Lunar New Year holiday, national mobility remained low until mid-February, and COVID-19 interventions delayed more than 72.89 million people returning to large cities. Mobility network analysis revealed clusters of highly connected cities, conforming to the social-economic division of urban agglomerations in China. While the mass migration back to large cities was delayed, smaller cities connected more densely to form new clusters. During the recovery period after travel restrictions were lifted, the netflows of over 55% city pairs reversed in direction compared to before the lockdown. These findings offer the most comprehensive picture of Chinese mobility at fine resolution across various scenarios in China and are of critical importance for decision making regarding future public-health-emergency response, transportation planning and regional economic development, among others.     

Making mobile knowledges. The educational cruises of the Revue Générale des Sciences Pures et Appliquées, 1897-1914

Over the past few years there has been an increasing acknowledgment that all knowledge is "sited knowledge." While place, mobility, and travel have become central issues in the history (and geography) of science, much of the discussion has nevertheless revolved around "formal scientific knowledge." This essay focuses on a specific type of popular "mobile" scientific knowledge making that emerged in the last decades of the nineteenth century: the educational cruise. In particular, it considers a series of voyages d'etude organized by the French scientific periodical Revue Générale des Sciences Pures et Appliquées between 1897 and 1914 that were open to the general public. It examines both the ways and the spaces in which knowledge was produced and the type of knowledge that was produced.     

Simultaneous measurement of concentrations and velocities of submicron species using multicolor imaging and microparticle image velocimetry

We propose a novel approach to resolve simultaneously the distributions of velocities and concentration of multiple, submicron species in microfluidic devices using microparticle image velocimetry, and particle counting. Both two-dimensional measurement and three-dimensional analysis of flow fields, from the stacked images, are achieved on applying a confocal fluorescence microscope. The displacements of all seeding particles are monitored to determine the overall velocity field, whereas the multicolor particles are counted and analyzed individually for each color to reveal the distributions of concentration and velocity of each species. A particle-counting algorithm is developed to determine quantitatively the spatially resolved concentration. This simultaneous measurement is performed on a typical T-shaped channel to investigate the mixing of fluids. The results are verified with numerical simulation; satisfactory agreement is achieved. This measurement technique possesses reliability appropriate for a powerful tool to analyze multispecies mixing flows, two-phase flows, and biofluids in microfluidic devices.     

WSMO理论框架与应用研究

WSMO作为W3C的成员报告,为语义网络服务提供了一个建模本体。文章全面系统的介绍WSMO的整体理论框架,包括理论模型(WSMO)、建模语言(WSML)和执行环境(WSMX)的构建,在此基础上,对WSMO和OWL-S两种描述网络服务的本体语言进行比较分析,并深入剖析了应用范例VTA。     

利用茶籽制取液体肥皂的研究

阐述了从茶籽中提取茶油和茶皂素的方法以及利人茶油和茶皂素制作液体肥皂的过程．将茶油脱色皂化后配入茶皂素便可制成一种新型纯天然洗涤剂．对其性质测试,结果满意     

鸡腿蘑的营养成分研究

报导了对鸡腿蘑所含营养成分氨基酸和游离脂肪酸的研究,结果表明其含有8种人体必需的氨基酸和不饱和脂肪酸．