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随着近年来桌面端性能的提升以及Web前端技术的快速发展,已涌现出多种重量级的前端框架。这些前端框架将促进应用架构的前后端分离,同时在一定程度上也减轻了后台的处理压力。当下主流的重量级前端框架有Vue,Angular,React,ExtJS等。其中ExtJS更是企业前端开发的一站式解决方案。它包含了上百种现成的前端组件,并且使用统一的外观风格能够快速地构建出复杂的B/S或者单页(SPA)应用。就针对ExtJS开发工具SenchaArchitect在企业应用中对前端页面开发效率的提升与优化进行讨论。 相似文献
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Laser-induced breakdown spectroscopy(LIBS) is a promising analytical spectroscopy technology based on spectroscopic analysis of the radiation emitted by laser-produced plasma.However, for quantitative analysis by LIBS, the so-called self-absorption effects on the spectral lines, which affect plasma characteristics, emission line shapes, calibration curves, etc, can no longer be neglected. Hence, understanding and determining the self-absorption effects are of utmost importance to LIBS research. The purpose of this review is to provide a global overview of self-absorption in LIBS on the issues of experimental observations and adverse effects,physical mechanisms, correction or elimination approaches, and utilizations in the past century.We believe that better understanding and effective solving the self-absorption effect will further enhance the development and maturity of LIBS. 相似文献
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为考察热管间的排列方式对热管传热效果的影响,用Fluent软件模拟不同气速及不同排列方式下热管式空气预热器热管间的温度场,结果表明,热管间正三角形排列更有利于热管传热. 相似文献
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The chemical composition of alloys directly determines their mechanical behaviors and application fields.Accurate and rapid analysis of both major and minor elements in alloys plays a key role in metallurgy quality control and material classification processes.A quantitative calibration-free laser-induced breakdown spectroscopy (CF-LIBS) analysis method,which carries out combined correction of plasma temperature and spectral intensity by using a secondorder iterative algorithm and two boundary standard samples,is proposed to realize accurate composition measurements.Experimental results show that,compared to conventional CF-LIBS analysis,the relative errors for major elements Cu and Zn and minor element Pb in the copperlead alloys has been reduced from 12%,26% and 32% to 1.8%,2.7% and 13.4%,respectively.The measurement accuracy for all elements has been improved substantially. 相似文献
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在冶金工业生产中,快速检测产品的化学元素组成对生产过程和产品质量的实时、现场控制具有重要意义。激光诱导击穿光谱(LIBS)技术具有无需制样、快速、无接触测量等优势,适合高温、振动等复杂环境下的冶金工业生产线上产品的在线原位监测。实验利用自主研发的共轴远程双脉冲LIBS测量装置对20 m处的6种合金钢标准样品进行探测,并采用内标法和偏最小二乘法对标准样品中的Cr、Mn、V 3种元素进行定量分析。采用内标法分析时,为提高定量分析的精度,选取合金钢的基体元素Fe作为内标元素,得到3种元素的定标曲线的相对标准偏差为4%~5%,决定系数均大于0.98,预测相对误差分别为7.64%、7.86%、9.09%。采用偏最小二乘法分析时,3种元素预测模型的决定系数均大于0.99,预测相对误差分别为15.79%、8.12%、8.53%。与偏最小二乘法相比,内标法获得了更加精确的定量结果。结果表明,共轴远程双脉冲LIBS测量装置具有远距离高精度探测能力。 相似文献