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1.
《淮北师范大学学报》2017,(2):55-59
为高效、准确检测离子迁移谱中离子峰的峰位、峰宽和峰高等信息,确定离子峰对应的物质种类和浓度,研究基于小波的离子迁移谱信号的去噪方法和基于高斯拟合方法的离子迁移谱信号的重构技术,给出在离子迁移谱检测爆炸物的应用中的测试结果.实验表明,基于高斯拟合结合小波降噪的方法来分析离子迁移谱信号,能够准确还原因为信号峰的重叠而消失的离子峰,提高应用离子迁移谱定性分析物质种类的能力. 相似文献
2.
MIG焊接过程中电弧电压和电流直接影响电弧稳定性、熔滴过渡行为、熔池几何形状等,同时焊接过程将产生声、光、磁、热等信号.本文主要研究焊接过程将产生声信号. 相似文献
3.
利用光谱技术研究了高电荷态离子40Ar 17离子入射金属Au表面产生的X射线谱。分析结果表明,特征X射线发射,与离子最初的电子组态有关,Ar的Kα-X射线是离子在与固体表面相互作用过程中在固体表面之下形成的空心原子发射的。 相似文献
4.
报道了用ECR离子源的高电荷态离子~(40)Ar~(10 )入射到p型Si表面的实验研究,通过实验测量到的Si原子和Si~(2 )离子的200nm-1000nm光谱,研究了谱线产生的机理。实验结果表明:低速高电荷态离子与固体表面相互作用中,可有效地激发原子和离子的特征谱线,分析了这一现象和相互作用过程的发光机理。 相似文献
5.
植物根系丛枝菌根共生体形成的信号途径 总被引：1，自引：0，他引：1
以植物根系丛枝菌根共生体形成的信号途径为主线,对菌丝接触根系前共生信号的产生和传导、附着胞的形成和菌丝的侵入以及丛枝菌根建立过程中的信号传导作了分析和讨论。 相似文献
6.
报道了用ECR离子源的高电荷态离子^40Ar^10 入射到P型Si表面的实验研究，通过实验测量到的Si原子和Si^2 离子的200nm-1000nm光谱，研究了谱线产生的机理，实验结果表明：低速高电荷态离子与固体表面相互作用中，可有效地激发原子和离子的特征谱线，分析了这一现象和相互作用过程的发光机理。 相似文献
7.
在重离子与靶原子直接碰撞导致原子内壳层空穴产额与离子入射动能关系的基础上,计算了单离子入射引起的原子间碰撞产生的原子内壳层空穴产额。给出了低能重离子与靶原子碰撞过程,原子内壳层X射线单离子产额与离子动能的关系。较好地解释了动能300~600 ke V的Xe^27＋离子入射Mo靶,激发的Mo的L X射线的实验结果。 相似文献
8.
离子在外电场的作用下,核和核外电子发生相对位移的过程,叫做离子极化。极化的结果,使原来没有偶极的“离子”产生了偶极,原来有偶极的偶极加大。一种离子既能充当电场,使相反电荷的离子发生极化,亦受其他离子电场的作用而被极化。离子充当电场作用的大小叫离子的极化能力,受电子作用而发生极化叫变形性。显然离子的极化是相互的,但是,对于阳离子来说极化能力是主要的,变形性是次要的;对阴离子来说变形性则是主要的,极化能力是次要的。下面,就离子的极化能力,变形性及 相似文献
9.
论文叙述了用C++语言设计一个相对简单的轻量级编程框架库的过程,该框架库设计为应用于音乐领域作曲软件的开发,具有如C++标准库的灵活性,扩展性,伸缩性.库设计基于一个简单的模型.在抽象的最高层次,模型由两个基本的功能组成:音乐信号产生部份和音乐信号绘制部份.信号产生部分连接音乐数据处理部分,最后把数据作为音乐信号绘制出来. 相似文献
10.
硫酸根离子的检验,从教材内容来看,是通过对比,得出"用可溶性钡盐溶液和盐酸(或稀硝酸)可以检验硫酸根离子的存在"这一结论.检验中使用盐酸(或稀硝酸)可排除某些阳离子的干扰,但是不能排除象银离子这样的金属离子的干扰.如果仅仅依照教材内容进行教学,学生容易产生机械的模仿,以为向任何一种被检溶液中加入氯化钡溶液后产生不溶于盐酸(或稀硝酸)的白色沉淀便得出存在硫酸根离子这样不可靠的结论.为了避免学生产生错觉,提高学生全面分析问题的能力和加强基本实验技能的训练,设计了下面的实验教学过程: 相似文献
11.
在可见光区测得了掺杂Clˉ离子和BFˉ4离子聚苯胺电极的光电响应 ,并利用光电流谱外推得到各自的平带电势 .对于同一种电极 ,重现性良好 ,光电化学方法可做为一种研究有机聚合物的有利手段 . 相似文献
12.
Phenolic formaldehyde(PF)and epoxy(EP)resins are commonly used in electronic packaging. In this paper, high-ohmic resistors(2.2 M?, ±0.5%,)with Cr-Si film were coated by PF/EP paint, and the resulting coated resistors were used for heat and humid(HH)experiments. The experimental results show that the corrosion of bandlike resistive films is selective and isotropic, and that the corrosion spots in resistive films all form along grooves and extend in the same direction. It is revealed that OH~- ions are generated due to the electrochemical reactions of resistive film in HH experiments, so a NaOH aqueous solution with pH about 10 was used to study the effects of absorbed water and OH~- ions on PF/EP polymer film. The results indicates that the color of some part on PF/EP polymer film changes due to corrosion, and that the corrosion part of the polymer film is easy to be peeled off. It can be inferred that OH~- ions generated in HH experiments may play a catalytic role in the chemical reactions between polymer film and the absorbed water, which accelerates the degradation of PF/EP protection film for a resistor. 相似文献
13.
Imprinted polymers were prepared for selective removal of Cu（Ⅱ） ions from metal solutions. Three ion-imprinted polymers were synthesized with methacrylic acid （MAA）, acrylamide （AA） and N,N＇-methylenebisacrylamide （MBAA） respectively as the functional monomers, ethleneglycoldimethacrylate （EGDMA） as the cross-linking agent, 2,2＇- azobisisobutyronitrile （AIBN） as the initiator and Cu （Ⅱ） ion as the imprint ion. The template Cu （Ⅱ） ion was removed from the polymer by leaching with a liquid of a 1：1 volumetric ratio of HCl to ethylenediaminetetraacetic acid （EDTA）. The capacity and selectivity of Cu（Ⅱ） ion adsorption were investigated with the three imprinted polymers and their non-imprinted counterparts. The polymers have a maximum adsorption capacity at pH 7.0. The isotherm of their batch adsorption of Cu（Ⅱ） ions shows a Langmuir adsorption pattern. Imprinted polymers all have a much higher capacity and higher selectivity of Cu（Ⅱ） adsorption than nonimprinted ones. MAA polymer benefits the most from imprinting. Imprinted MAA polymer has the highest selectivity when used to rebind Cu （Ⅱ） ion from an aqueous solution in the presence of other metal ions. Ion imprinting can be a promising technique of preparing selective adsorbents to separate and preconcentrate metal in a medium of multiple competitive metal ions through solid phase extraction （SPE）. 相似文献
14.
Imprinted polymers were prepared for selective removal of Cu(II) ions from metal solutions. Three ion-imprinted polymers were synthesized with methacrylic acid (MAA), acrylamide (AA) and N,N'-methylenebisacrylamide (MBAA) respectively as the functional monomers, ethleneglycoldimethacrylate (EGDMA) as the cross-linking agent, 2,2'-azobisisobutyronitrile (AIBN) as the initiator and Cu (II) ion as the imprint ion. The template Cu (II) ion was removed from the polymer by leaching with a liquid of a 1:1 volumetric ratio of HCl to ethylenediaminetetraacetic acid (EDTA). The capacity and selectivity of Cu(II) ion adsorption were investigated with the three imprinted polymers and their non-imprinted counterparts. The polymers have a maximum adsorption capacity at pH 7.0. The isotherm of their batch adsorption of Cu(II) ions shows a Langmuir adsorption pattern. Imprinted polymers all have a much higher capacity and higher selectivity of Cu(II) adsorption than non-imprinted ones. MAA polymer benefits the most from imprinting. Imprinted MAA polymer has the highest selectivity when used to rebind Cu (II) ion from an aqueous solution in the presence of other metal ions. Ion imprinting can be a promising technique of preparing selective adsorbents to separate and preconcentrate metal in a medium of multiple competitive metal ions through solid phase extraction (SPE). 相似文献
15.
徐冬东 《齐齐哈尔师范高等专科学校学报》2010,(4):112-115
本研究的目的是探讨同伴互评作文对中国非英语专业本科生写作能力的影响。为了达到研究目的,进行了一项准实验研究。实验组在写作中采用同伴互评作文的方法,控制组采用自评作文的方法。本实验发现：除了两组学生都不能对作文的宏观方面进行有效的修改外,同伴互评作文在其它方面显著优于自评作文。 相似文献
16.
To investigate the effects of salt concentration and freeze-thaw （FT） on the first hydration shell of Zn2+ ions in Zn（NO3）2 aqueous solutions, extended X-ray absorption fine structure （EXAFS） spectroscopy was used to examine Zn K-edge EXAFS spectra of Zn（NO3）2 aqueous solutions with various concentrations before and after FT treatment. The influences of salt concentration and freeze-thaw on the structural parameters of the first hydration shell of Zn2+ ions, including hydration number, Zn-O distance and thermal disorder, were analyzed. The results show that Zn2+ ions have 3.2―6.8 nearest oxygen neighbors with the Zn-O distance being 0.202―0.207 nm. In highly concen-trated solutions, Zn2+ ions are hydrated with four water molecules in a tetrahedral form. The dilution of Zn（NO3）2 aqueous solutions increases the number of water molecules in the first hydration shell of Zn2+ ions to six with their octahedral arrangement. Both the hydration number in the first hydration shell of Zn2+ ions and the degree of thermal disorder increase when the FT treatment is operated in Zn（NO3）2 aqueous solutions. 相似文献
17.
王丽华 《雁北师范学院学报》2006,(2)
在中国原子能科学研究院用HI-13串列加速器提供的80Mev和110Mev的Cu离子,用束箔技术,测量了波长在11-38nm范围内Cu的束箔光谱．新识别出Cu的16条跃迁谱线,首次给出实验观测值． 相似文献
18.
研究了火焰原子吸收光谱法测定云冈石窟降尘中钾、钙、锌、锶含量的方法。将样品研磨．过200目筛后用微波消解仪消解,在原子吸收分光光度计上测定消解液中钾、钙、锌、锶的吸光度,采用标准曲线法计算其含量。样品处理过程快速准确,方法简单。 相似文献
19.
利用离子注入技术掺杂制作光电子器件时,需要了解离子注入材料的射程分布、射程离散和横向离散．介绍了用400keV能量的Nd离子分别垂直和倾斜60°角注入两块相同的Si晶体样品中,利用卢瑟福背散射技术研究了400keV,5×10^15ions／cm^2Nd离子注入Si晶体的横向射程离散．测出的实验值和TRIM’98得到的理论模拟值进行了比较,发现实验值跟TRIM’98模拟计算的理论值能较好地符合． 相似文献
20.
Jean Kelly 《Gender and education》1991,3(2):137-143
This article attempts to determine whether men dominate the language in the mixed‐gender adult classroom. Form‐based and activity‐based research methods were used with a group of adults on a training project at Cranford Community School in the London Borough of Hounslow. The findings were related to some of the relevant literature on the linguistic domination of boys in the school classroom and an attempt was made to establish whether men use the same devices to control the language in adult learning situations. 相似文献