搜索结果: 31-45 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(2.977 秒)
基于偏振光的棉纤维成熟度仪系统
棉纤维 成熟度 偏振光
2009/8/6
开发基于偏振光的棉纤维成熟度仪系统。利用单片机的集成度高、功能强、可靠性高、结构简单、应用灵活和价格低等特点，以偏振光成熟度检测原理为基础，运用单片机实现检测的自动化、智能化。通过光学电路将棉纤维成熟度以光电信号形式输出，用A/D转换通道进行模数转换，完成对成熟度各个参数的计算，与标准值比较并输出相对偏差。
在分析改性碳纤维和镍粉的复介电常数和复磁导率的基础上,进行复合电磁屏蔽涂层结构的设计,以实现频率小于1.5GHz的电磁波屏蔽效能的提高.制备了改性碳纤维/丙烯酸酯类树脂和镍粉/丙烯酸酯类树脂的电磁屏蔽涂料.实验表明:对填料基本电磁参数的分析能优化多层屏蔽涂层的设计,依据电磁参数来调整各层屏蔽涂料所用填料,可实现逐层阻抗匹配和提高屏蔽效能.在频率小于1.5GHz的低频区域,多层屏蔽涂层的最大电磁屏蔽...
Proeutectic crystallisation in hypereutectic silumins modified with Al-CuP-Me master alloys
Theoretical fundamentals of the crystallisation process Modification Proeutectic crystallisation Silumins
2009/6/30
Using thermal analyses TA and ATD,within a narrow range of the crystallisation period, i.e. until reaching an equilibrium temperature,the occurrence of exothermic effect was stated. Most probably, the...
电爆炸方法合成纳米材料研究及表征
电爆炸 微波吸收
2009/6/23
电爆炸方法是一种合成纳米材料的高效方法。合成的纳米材料具有高内能，部分材料的纳米晶呈现高温高压相等特点和微晶内部具有极高的缺陷密度（位错、空穴、孪晶等）。本文介绍两种不同的放电方法：采用金属丝放电合成纳米Al粉和纳米Cu粉，通过扫描电镜分析其形貌为球形。铝粉颗粒粒度分布在10~100 nm，平均尺寸在30nm；铜粉颗粒粒度分布在10~200 nm，平均尺寸为50nm。用液体中尖端放电方法，分别用二...
High-aluminium zinc alloy (ZnAl27Cu2) modified with titanium and boron
Zn alloys Modification Structure Mechanical properties
2009/6/19
The paper presents the results of investigations concerning the influence of the titanium-boron modifier quantity on the structure and mechanical properties of ZnAl27Cu2 alloy. The modification has be...
Determination of Weibull Analysis of the Hypereutectic Silumins Reliability in Failure Time Respect
Computer-aided casting production Weibull analysis Reliability Analysis of fault occurrence time
2009/4/20
The results of dynamic evaluation of the reliability of hypereutectic AlSi17Cu3NiMg silumin under the effect of symmetrical cyclic tensile-compressive stresses were presented. Studies were carried out...
Determination of Weibull Analysis of the Hypereutectic Silumins Reliability in Failure Time Respect
Computer-aided casting production Weibull analysis Reliability Analysis of fault occurrence time
2009/4/20
The results of dynamic evaluation of the reliability of hypereutectic AlSi17Cu3NiMg silumin under the effect of symmetrical cyclic tensile-compressive stresses were presented. Studies were carried out...
An attempt of assessing the production perspectives concerning malleable iron castings
Ductile iron Nodular cast iron Production
2009/4/20
The paper presents a historical outline of production of the malleable cast iron castings on the territory of Poland during the past over a hundred years. There have been also gathered data concerning...
An attempt of assessing the production perspectives concerning malleable iron castings
Ductile iron Nodular cast iron Production
2009/4/20
The paper presents a historical outline of production of the malleable cast iron castings on the territory of Poland during the past over a hundred years. There have been also gathered data concerning...
Effect of modification and cooling rate on the macrostructure of IN-713C alloy
Nickel superalloys Macrostructure Cooling rate Modification Equiaxial grains Shape factor
2009/4/17
The results of investigations of the effect of modification and cooling rate on the macrostructure of castings made from IN-713C nickel superalloy were described. As a modifier, cobalt aluminate CoAl2...
Effect of modification and cooling rate on the macrostructure of IN-713C alloy
Nickel superalloys Macrostructure Cooling rate Modification Equiaxial grains Shape factor
2009/4/17
The results of investigations of the effect of modification and cooling rate on the macrostructure of castings made from IN-713C nickel superalloy were described. As a modifier, cobalt aluminate CoAl2...
以基于Cr系催化剂、不同己烯含量的管材用乙烯己烯共聚物为研究对象, 应用1H固体NMR技术测定了其室温下的相结构参数以及不同温度下的相结构变化. 研究发现, 随着共聚单体含量的增加, NMR结晶相组分的含量降低, 界面区和无定形区组分含量增加, 且两者在NMR测定的长周期中所占的比例也增加. 提出了以界面区含量和无定形区含量的比例随温度的变化作为定性判断非晶区中链段运动受限程度的依据. 此外, ...
The analysis of carbon attendance in copper alloys as reason of gas porosity
Carbon Copper alloy Porosity
2009/4/6
In the work show, that opinions the leaning on it dissolubilities of carbon can be recognized (and only in approximation) only for copper out large purity. They do not concern it her mostly multiple a...
The analysis of carbon attendance in copper alloys as reason of gas porosity
Carbon Copper alloy Porosity
2009/4/6
In the work show, that opinions the leaning on it dissolubilities of carbon can be recognized (and only in approximation) only for copper out large purity. They do not concern it her mostly multiple a...