搜索结果: 16-30 共查到“知识库 材料检测与分杂技技术”相关记录122条 . 查询时间(2.056 秒)
Effect of eddy current frequency on measuring properties of devices used in non- destructive measurements of non-ferromagnetic metal plates
Non-destructive testing Eddy currents Flaw detection Conductometry
2009/12/2
Purpose: To determine optimal frequency of the electromagnetic field that raises eddy currents during the search
for surface defects in non-ferromagnetic materials or conductivity measurements by mea...
A model of heat transfer in composites subjected to thermographic testing
Polymer composite Thermovision Diagnostics Degradation
2009/12/2
Purpose: The aim of the paper is to present a model of heat transfer taking place during thermovision testing of
polymer composites. The purpose of thermographic tests was to identify thermal propert...
The determination of the thickness of composite layer
Casting Composite Surfacing alloy layer
2009/12/2
Purpose: In this article the thermal simulation of formation composite layer on steel model casting and real casts
were presented and described. There is also shown a computer program to determine th...
Detecting of defects in polymeric materials using pulsed infrared thermography
Non-destructive testing (NDT) Thermography Defect
2009/12/2
Purpose: The aim of this paper was to determine the possibility of the use of non-destructive thermographic
testing to detect defects in polymeric materials and steel in compare purpose. To use the t...
Superplasticity studies in a beta titanium alloy
Superplasticity Dynamic recrystallization Beta titanium
2009/12/1
Purpose: In the present study, the Superplastic Forming and deformation behavior as well as related mechanisms
of this titanium alloy were investigated.
Design/methodology/approach: The high tempera...
Diagnostics of crack formation in castings using the logic of plausible reasoning
Mechanical properties Casting defects Cracks
2009/12/1
Purpose: Cold cracks are the defect often encountered in castings. Quick diagnosis of the cause of crack
formation enables preventing the formation of other cracks in the next casting process and ena...
Ultrasonic methods in diagnostics of polyethylene
Engineering polymers Properties Mechanical properties
2009/12/1
Purpose: The aim of the work was to find relationship between the ultrasonic wave velocity and the strenght
and stess in a polyethylene specimens.
Design/methodology/approach: The experiments have b...
Fractional gas analysis procedure for determining the contents of oxide and nitride phases in ALNICO alloys
Alnico fractional gas analysis oxide inclusions
2009/10/23
Fractional gas analysis procedure for estimating the contents of oxide and nitride inclusions in Alnico alloys produced from wastes of production is developed. The effect of the temperature and time o...
Modification of oxygen and sulphur inclusions in steel by calcium treatment
modification oxygen and sulphur inclusions calcium treatment
2009/10/23
In the article, the results of examinations of changes in deformability of oxygen and sulphur inclusions in structural steel processed with calcium are discussed. The results obtained imply the positi...
氧含量测定方法及在人造金刚石用触媒质量控制中的应用
人造金刚石 氧含量 测定
2009/10/21
目前人工合成金刚石主要采用有触媒合金参与的高温高压静压法,触媒合金中的氧对金刚石的形核长大以及晶体质量影响很大,尤其是采用易氧化的铁基合金作触媒更为明显.阐明合金中氧对金刚石形核生长以及质量影响机理研究,已经成为国内外金刚石工作者关注的重点.本文综述了几种常用的测定氧含量的方法,在阐述机理的基础上对其进行了分类比较,同时对铁基触媒中氧含量的红外定量检测以及氧含量在触媒制备过程中的变化规律进行了探讨...
顶空气相色谱法测定盐酸氮卓斯汀中残留溶剂
盐酸氮卓斯汀 顶空气相色谱法 残留溶剂
2009/9/30
建立毛细管气相色谱法测定盐酸氮卓斯汀中残留溶剂。采用DB-624毛细管色谱柱，FID检测器，二甲基甲酰胺为溶剂，程序升温，外标法同时检测盐酸氮卓斯汀中乙醇、丙酮、二氯甲烷、正己烷4种有机溶剂残留量。各待测组分完全分离，线性关系良好，检测限分别为3.51μg/mL、0.35μg/mL、2.12μg/mL、0.11μg/mL，精密度RSD<5%，平均回收率99.1%~102.4%。本法操作简单，结果准...
固相微萃取技术在农药残留检测中的应用进展
固相微萃取 SPME 农残
2009/9/30
本文主要研究固相微萃取技术在农药残留检测中的应用进展，对固相微萃取技术的特点、重要部件的选择进行总结，针对不同萃取方式和萃取条件对测试结果的影响进行综述，并介绍近年来固相微萃取与其他分析仪器联用在农药残留检测领域的应用与展望。
古文物的拉曼光谱分析
拉曼光谱 古文物 无损检测
2009/9/29
利用拉曼光谱对云南腾冲出土的新石期的石斧和北京古玩市场上的古玉器进行成分分析. 样品未作任何特殊处理,用显微共焦拉曼光谱仪对样品不同部位进行分析. 实验发现石斧为蓝晶石矿物而非硬玉; 翡翠制品中含有环氧树脂谱线. 这一研究工作表明,拉曼光谱作为现代技术非常适合于不允许取样的珍贵艺术品的无损辨识成分分析.
BPC和AlCl3-BPC离子液体的制备及性能研究
AlCl3-BPC离子液体 电位窗 电导率
2009/9/28
合成了氯化正丁基吡啶(BPC)和三氯化铝－氯化正丁基吡啶(AlCl3-BPC)离子液体,通过1H NMR和Raman光谱对BPC进行了结构检测.测定了酸性、中性和碱性3种AlCl3-BPC离子液体的电位窗和电导率.中性AlCl3-BPC离子液体的电位窗最宽.在一定的温度范围内,三种离子液体的电导率均随温度的升高而增大,并符合Arrhenius方程.酸性AlCl3-BPC离子液体的电导率最大,碱性次...
纳米粉体的结构表征方法研究
纳米粉体 表征
2009/9/7
主要介绍纳米粉体的测试与表征方法，对现阶段各种先进的测试方法进行了相关的研究说明，包括纳米材料的成分分析，晶体结构分析，表面与介面分析，形貌分析等几大类。成分分析主要使用的是原子吸收光谱法、ICP和红外光谱等方法；用XRD、XPS、拉曼光谱等方法分析纳米粉体晶体结构；表面与界面分析包括粒径大小、比表面积测定和表面电荷的研究方法。介绍了应用各种显微镜进行形貌分析的方法。