《中国图书馆学报》大印象          下载免费PDF全文

张欣毅 《中国图书馆学报》2007,33(5)

《中国图书馆学报》创刊50周年了。50年可分为三个时期,每个时期都为本行业做出了可贵贡献。希望它不断进步,创造新业绩。  相似文献   

油菜汇油50稀植栽培研究     

李孟良  马坤  颜军 《安徽科技学院学报》2000,(4)

本文研究了汇油 5 0不同密度下的生育特性、产量表现及产量构成。在每公顷 30 0kg左右纯氮 ,密度4.5～ 7.5万株 /公顷稀植条件下 ,每公顷产量可达 2 90 0kg左右 ,比对照增产 1 1 .9%～ 1 6 .2 %。  相似文献   

Production of carotenoid sarcinaxanthin by Kocuria palustris isolated from Northeastern Brazil Caatinga soil and their antioxidant and photoprotective activities     

《Electronic Journal of Biotechnology》2021

BackgroundThis study aimed to produce carotenoids of two bacterial strains obtained and isolated from Caatinga soil in Northeastern Brazil and to evaluate their antioxidant and photoprotective activities. The morphological identification of bacteria was performed by Gram staining and molecularly confirmed through the 16S rRNA gene. The production of carotenoids was performed on two 2³ factorial designs to analyze the influence of independent variables (temperature range, luminosity, agitation, spiral presence, and bacterial isolate type) for maximum carotenoid yield. The selected condition has been transferred to a bioreactor (10L). The identification of carotenoids was performed by liquid chromatography (HPLC) and mass spectrometry (LC-MS). Antioxidant activity was determined by inhibiting the β-carotene/linoleic acid system and the effectiveness as sunscreen was measured through its sun protection factor (SPF).ResultsThe results revealed that the isolates FT-7.22 and FT-5.12 were identified as Kocuria palustris; producers of a rare C50 carotenoid sarcinaxanthin. This is the first report on the production of carotenoids by this species from the Caatinga Domain. The pigment that was obtained from the Tryptic Soy Broth (TSB) medium in the best conditions of the factorial designs (increased agitation, aeration, and light exposure) exhibited a significant increase in the carotenoid production. The isolated FT-7.22 reached a higher sarcinaxanthin concentration (112,480 μg/L), and it exhibited promising antioxidant (76.53 ± 0.09%) and photoprotective activities (SPF = 9.36 ± 0.52).ConclusionsThis study demonstrated the ability of K. palustris to produce carotenoid sarcinaxanthin with antioxidant and photoprotective activities so that it can be applied in cosmetic formulations.How to cite: Mendes-Silva TCD, Vidal EE, de Souza RFR, et al. Production of carotenoid sarcinaxanthin by Kocuria palustris isolated from Northeastern Brazil Caatinga soil and their antioxidant and photoprotective activities. Electron J Biotechnol 2021;53. https://doi.org/10.1016/j.ejbt.2021.05.004  相似文献   

一种确定神经网络最优结构的新算法     

吕晓丽  张瑞  王博  崔新月 《西安文理学院学报》2014,(4):4-8

从神经网络结构设计问题出发,提出一种确定神经网络最优隐节点个数的新方法.该算法首先按照等差数列增加隐节点,确定最优隐节点个数的范围;然后利用折半删减法确定最优隐节点个数.数值实验表明该算法在保持良好泛化能力的同时能自适应地、快速有效地确定网络最小隐神经元数目.  相似文献   

我国20km竞走项目体能训练现况及未来训练走向研究     

王传平  胡好  翟波宇 《河北体育学院学报》2011,25(2):56-61

从20 km竞走项目的本质属性、特点及其训练理念入手,对我国20 km竞走的体能训练进行研究。认为,我国20km竞走项目体能训练问题表现在理论研究与训练行为两个层面。具体表现为：聚焦局部者多,整体探究者少;坐而论道者多,注重实证者少;训练行为抓小放大,缺乏系统观念;训练理念各异,负荷安排无章可循。在此基础上指出,突出体能属性,统一训练理念;细化体能结构,把握整体规律;贴近训练实践,注重实证分析;加强制度建设,促进沟通协作是我国20 km竞走项目体能训练的发展走向。  相似文献   

浅谈五十音图的趣味教学法     

刘许旭 《科教文汇》2011,(10):150-150,152

学英语从ABC字母开始学,学日语从＂あいうえお＂也就是五十音图开始学。那么,怎样才能又快又好地掌握五十音图呢？很显然,只靠死记硬背肯定是不行的,因为死记硬背忘得太快,事倍功半。因此,本文提出趣味教学法,使原本枯燥乏味的日语假名学习,变得生动有趣。  相似文献   

Z39.50/Web网关系统的设计与实现原则   总被引：7，自引：2，他引：5  

祝忠明  沈英 《现代图书情报技术》2001,17(4):3-5

Z39.50 协议在异构系统之间的信息检索方面具有独特的优势, 而Z39.50/Web 网关的目的在于利用Web 的简单易用性和易接近性, 使Z39.50 应用得到更广泛的利用。本文首先介绍了Z39.50 协议的主要内容, 然后讨论了基于Web 的Z39.50 应用的机制, 最后着重阐述了在书目信息的检索应用方面, 设计和实现一个实用的Z39.50/Web 网关系统应该遵循的原则。  相似文献   

近50年《聊斋志异》在日本的传播和研究     

王枝忠 《福建师范大学学报(哲学社会科学版)》2006,(6):109-113,130

二战以后的50年里，《聊斋志异》在日本的传播和研究获得新的巨大发展。表现在翻译方面．不但数量大大超过此前，尤其有以各种版本的《聊斋志异》为底本的译作先后问世。其次是改编的成绩前所未有。不但各种文艺形式都有，而且时日本文学产生了积极影响。最引人注目的还是对蒲松龄厦其著作（主要是《聊斋志异》）的研究得到了长足发展，并且持续近半个世纪之久，涌现出一批出色的硕儒新进。取得了丰硕的成果。  相似文献   

Pygmalion at 50: harnessing its power and application in schooling     

Rhona S. Weinstein 《Educational Research and Evaluation》2018,24(3-5):346-365

ABSTRACT

This special issue marks the 50th anniversary of the landmark Pygmalion experiment (Rosenthal & Jacobson, 1968). It offers contributions from across the globe, attesting to universal features of teacher expectancy effects. Reviews of this history underscore controversy, advances, and few intervention studies. Empirical studies emphasise teacher expectancy effects at group, classroom, and school levels, contrast expectation measures, and explore longitudinal and developmental perspectives, advancing the field. Despite headway, I argue that the field’s contested history has stifled its fullest investigation. Conclusions drawn – not replicable, small and dissipating effects, and largely accurate teacher expectations – have underestimated Pygmalion’s power and limited investment in intervention research to promote positive educational prophecies, especially for students placed at the margins. It is time for a greater articulation of the conditions under which expectancy effects are most powerful. It is also time to apply our tremendous knowledge towards the design and evaluation of positive expectancy interventions.  相似文献   

跨库检索系统的实施与研究   总被引：1，自引：0，他引：1  

杨武健  李军艳 《现代情报》2005,25(11):158-161

本文借鉴元搜索引擎的原理，采用web检索的方式，建立了一个基于java技术的可跨平台的跨库检索系统模型，并就其设计思想、系统结构和实现要点进行了详细介绍。能满足用户对数据库跨库检索和并发检索的需要。通过它能同时检索到多个数据库中的内容。弥补目前大多数搜索引擎达不到的功能。  相似文献