水及饮料中铜含量测定研究──巯基棉分离富集、离子选择电极法     

甄宝勤  聂峰  闫英桃 《陕西理工学院学报(社会科学版)》1999,(3)

采用巯基棉分离富集痕量铜,用3mol．L-1HCl作洗脱剂洗脱富集在巯基棉上的铜,结合离子选择电权法建立了水饮料中痕量铜的离子选择电极分析方法．该法简单、分析灵敏度高,选择性好,检出限量8．30×10－8mol·L－1铜。相对标准偏差为3．8％（n＝7;Cs＝7．2×10－7mol．L－1Cu2＋）．  相似文献   

新工科和专业认证背景下地方高校的科技特派员制度建设          下载免费PDF全文

聂小武  蔡明灯 《上海教育评估研究》2021,10(4):35-39

工程教育认证和新工科建设对人才培养及产教融合提出了新的要求,需要地方高校加大力度、拓宽产教融合体系。科技特派员制度有助于地方高校开展工程教育认证和新工科建设。文章探讨了新时代地方高校科技特派员制度存在的问题,如宣传力度不够、教师本人不够重视、信息化管理水平低、考评体系不完善等,指出地方高校应主动与科技局建立科技特派员顶层计划、提高教师认识积极投身于科技特派员工作、与当地政府打造科技特派员工作站、建章立制地加强科技特派员的考核与激励。  相似文献   

对Y-△起动控制电路的探讨   总被引：1，自引：0，他引：1  

徐祥征  聂国星 《科技广场》2005,(3):116-117

本文对电工学教材中比较常见的Y-△起动控制电路工作的可靠性进行了分析,并阐述了提高Y-△起动控制电路工作可靠性的方法。  相似文献   

一种基于径向基网络的读者流失分析模型     

聂珍 《现代情报》2010,30(6):27-30

大量而频繁的读者流失导致了图书馆知识服务范围的减少,降低了图书馆信息服务的质量。本文根据读者资料和借阅行为及其相关数据等历史信息,将径向基神经网络应用于读者流失分析中,针对目前图书借阅中存在的问题,给出了读者流失预测模型,利用训练后的模型对读者的流失率进行预测并生成读者列表。该模型通过试验运行,取得了良好的效果,对大学图书馆的服务策略实施具有现实的指导意义。  相似文献   

面向多视点的商品本体建模     

张博  聂规划 《情报杂志》2010,29(4)

提出了商品流通中存在视点认知差异和商品视点知识的观点,分析了多视点背景下商品认知差异的表现,建立了多视点商品认知模型;在该认知模型的基础上,运用本体工程学中本体的建设的标准技术,构建了多视点商品本体的元模型,实践证明该模型更加拟合实际电子商务环境的需要.  相似文献   

文旅融合环境下图书馆服务创新发展研究     

王欢  聂慧英  郭春阳 《河北科技图苑》2022,35(2):3-9,52

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Double lock of a potent human therapeutic monoclonal antibody against SARS-CoV-2     

Ling Zhu  Yong-Qiang Deng  Rong-Rong Zhang  Zhen Cui  Chun-Yun Sun  Chang-Fa Fan  Xiaorui Xing  Weijin Huang  Qi Chen  Na-Na Zhang  Qing Ye  Tian-Shu Cao  Nan Wang  Lei Wang  Lei Cao  Huiyu Wang  Desheng Kong  Juan Ma  Chunxia Luo  Yanjing Zhang  Jianhui Nie  Yao Sun  Zhe Lv  Neil Shaw  Qianqian Li  Xiao-Feng Li  Junjie Hu  Liangzhi Xie  Zihe Rao  Youchun Wang  Xiangxi Wang  Cheng-Feng Qin 《国家科学评论(英文版)》2021,8(3)

Receptor recognition and subsequent membrane fusion are essential for the establishment of successful infection by SARS-CoV-2. Halting these steps can cure COVID-19. Here we have identified and characterized a potent human monoclonal antibody, HB27, that blocks SARS-CoV-2 attachment to its cellular receptor at sub-nM concentrations. Remarkably, HB27 can also prevent SARS-CoV-2 membrane fusion. Consequently, a single dose of HB27 conferred effective protection against SARS-CoV-2 in two established mouse models. Rhesus macaques showed no obvious adverse events when administrated with 10 times the effective dose of HB27. Cryo-EM studies on complex of SARS-CoV-2 trimeric S with HB27 Fab reveal that three Fab fragments work synergistically to occlude SARS-CoV-2 from binding to the ACE2 receptor. Binding of the antibody also restrains any further conformational changes of the receptor binding domain, possibly interfering with progression from the prefusion to the postfusion stage. These results suggest that HB27 is a promising candidate for immuno-therapies against COVID-19.  相似文献   

Machine Learning Literacy for Measurement Professionals: A Practical Tutorial     

Rui Nie  Qi Guo  Maxim Morin 《Educational Measurement》2023,42(1):9-23

The COVID-19 pandemic has accelerated the digitalization of assessment, creating new challenges for measurement professionals, including big data management, test security, and analyzing new validity evidence. In response to these challenges, Machine Learning (ML) emerges as an increasingly important skill in the toolbox of measurement professionals in this new era. However, most ML tutorials are technical and conceptual-focused. Therefore, this tutorial aims to provide a practical introduction to ML in the context of educational measurement. We also supplement our tutorial with several examples of supervised and unsupervised ML techniques applied to marking a short-answer question. Python codes are available on GitHub. In the end, common misconceptions about ML are discussed.  相似文献   

新时代高职院校构建劳动教育实施体系的策略探索     

聂勇  陈思 《高校辅导员学刊》2022,14(2):95-100

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