电感耦合等离子体质谱法在稀土分析中的应用进展研究     

龚兴芳 《科技广场》2014,(9)

本文对ICP-MS法的原理进行了论述,并对其在稀土元素测试中的应用进行了介绍。电感耦合等离子体质谱法能够对多个稀土含量进行测定,检出限低,灵敏度高,在痕量稀土测量方面极具优势。ICP-MS在稀土分析中的应用日益广泛,已经成为稀土分析的重要手段之一。  相似文献   

磁共振成像仿真平台设计与实现     

水力 《人天科学研究》2014,(6):147-150

为了更好地研究MRI成像技术和图像重建算法,采用Matlab图形用户界面创建了MRI仿真平台。该平台模拟了线性、螺旋及并行扫描3种成像方式,可以导入不同模型图像,设计K空间扫描轨迹,模拟K空间数据采集过程,显示采集信号的波形。对这3种成像方式的图像重建加以实现,并对重建误差进行了分析。该平台为其它各种MRI数据采集和图像重建新算法的研究提供了一种有效工具。  相似文献   

题目：采用纳米压痕及动态模量图研究 C-S-H 凝胶/水泥颗粒界面的纳米力学性能     

Jing XU  David J.CORR  Surendra P.SHAH 《浙江大学学报(A卷英文版)》2015,(1):38-46

目的：揭示水泥基材料中 C-S-H 凝胶/水泥颗粒界面的尺寸及微观力学特性,为从纳米尺度理解水泥基材料的性能提供依据。创新点：采用动态模量图技术对 C-S-H 凝胶/水泥颗粒界面微区的尺度及力学行为进行研究,借助动态模量图的高分辨性,可获得该微区精确且有效的信息。方法：对比利用纳米压痕及动态模量图对 C-S-H 凝胶/水泥颗粒界面进行研究。结论：纳米压痕仅能粗略估计界面微区的尺寸及力学参量,相比之下,动态模量图的分辨率要高出2个数量级（表2）,因此可获得更精确的测量值。C-S-H凝胶/水泥颗粒界面的尺寸在250 nm左右,模量值介于60 GPa和70 GPa之间。此界面区可认为是包覆水泥颗粒周围的一层紧密的水化层结构,其致密性将阻止内部水泥的进一步水化。  相似文献   

一种工业DR检测产品软件的开发     

乔立强 《喀什师范学院学报》2014,(6):33-34

在简单介绍了所研制的DR检测产品的系统组成和产品类型基础上,给出了该产品的配套软件.其主要有四个组成模块——图像采集模块、图像处理模块、图像存储和权限管理模块、评片工具模块.详细分析了这四个模块的功能,介绍了软件的快捷工具条,并给出了其外部接口设计.实际使用证明,该软件简洁适用,能够配合所研制的DR产品完成工件的探伤工作.  相似文献   

顾客参与对企业自主创新能力的影响研究——界面管理的调节效应     

来尧静  徐宇  宋秀林 《科技管理研究》2017,(16)

近年来,自主创新的浪潮席卷全国,以顾客需求为导向的超强竞争时代也随之来临。以此为契机,拟从维度层面探索顾客参与通过界面管理对企业自主创新能力各维度的的影响机制,采用层次回归法检验界面管理在顾客参与和企业自主创新能力间的调节效应,从而为学者和企业家对企业自主创新过程中顾客参与的重要性提供指导。  相似文献   

企业界面管理实证研究   总被引：20，自引：0，他引：20  

郭斌 《科研管理》1999,20(5):73-79

界面管理对于提高企业创新活动效率和绩效是一个重要的问题。本文从企业间界面、企业内职能间界面和企业职能内亚界面三个层次对界面问题的产生原因、界面的信息过程、特性及影响因素进行了实证性分析和探讨。最后,本文指出了企业界面过程存在的规模差异性  相似文献   

Collaboration in a Virtual World: Support for Conceptual Learning?     

Paul Brna  Rob Aspin 《Education and Information Technologies》1998,3(3-4):247-259

Immersive and semi-immersive Virtual Reality (VR) systems have been used for training in the execution of procedures, in exploring (often static) 3D structures such as architectural designs or geographical features, and in designing buildings or constructing molecules. In a separate line of technological development, the availability of distributed computing capabilities has led to VR systems that provide facilities for groups of students that are geographically separated to learn together in a collaborative manner. However, relatively little work has been done to investigate the advantages of such Collaborative Virtual Environments (CVEs) for learning the underlying conceptual content.A pilot study is described which features several worlds designed as part of the Distributed Extensible Virtual Reality Laboratory (DEVRL). The basic results are presented along with a discussion as to how the research could be moved forward to provide improved support for conceptua l learning. The discussion also raises the issues of how the interfaces design affects conceptual learning; of navigation and conceptual learning; of the role of collaboration in learning; and of the difficulties associated with constructing dynamic VR worlds. © IFIP, published by Kluwer Academic Publishers  相似文献   

User Interfaces for a Virtual Learning Environment: Two Study Cases     

Krassen Stefanov  Darina Dicheva  Roumen Nikolov  Ivanka Djakova 《Education and Information Technologies》1998,3(3-4):307-319

A recent powerful idea in the design of Web-based learning environments is the usage of virtual places. The employment of interface metaphors is one of the approaches enabling inexperienced users to feel comfortable in such virtual environments. We have designed a Virtual Environment for Distance Education and Training (VEDET), which provides basic virtual spaces, resources, and services. In this paper we discuss the user interface of two Web-based distance learning courses Business on the Internet and Business English, developed on the basis of VEDET. A web-based learning environment has been implemented to support the delivery of these courses. Two examples of interface metaphors have been developed and adopted, each presenting a coherent image of the environment. © IFIP, published by Kluwer Academic Publishers  相似文献