Visualization and quantification of water movement in porous cement-based materials by real time thermal neutron radiography:Theoretical analysis and experimental study

Water movement in porous cement-based materials is of great importance when studying their deterioration processes and durability.Many traditional methods based on mass changes,electricity or nuclear magnetic resonances are available for studying water transport in cement-based materials.In this research,an advanced technique i.e.thermal neutron radiography was utilized to achieve visualization and quantification of time dependent water movement including water penetration and moisture vapor in porous cemen...     

Current Status of Education of Deseriptive Geometry in Europe

In this paper the importance of eometry?and raphics?for the advancement of science and knowledge in 19th century is pointed out. Klein and Müller reform of geometry syllabus in 19th century and the education situation of Geometry and Graphics in Europe during the last third of 20th century are introduced. The problems of geometry and graphics education during the next decedes and six proposals are presented.     

Combining Contactless Inductive Flow Tomography and Mutual Inductance Tomography for Two-Phase Flow Measurements at a Continuous Casting Model

The flow structure in the mould of a continuous caster is of key importance for the quality of the final product.The use of most conventional flow measurement techniques is prevented by the high temperature of the liquid steel.For a downscaled physical model of the continuous casting process,we present combined measurements of the flow in the mould by Contacfless Inductive Flow Tomography(CIFT),and of the conductivity distribution in the submerged entry nozzle by Mutual Inductance Tomograpliy(MIT).In addition,we summarize an experiment with a magnetic stirrer around the submerged entry nozzle and its effects on the flow in the mould.Some new developments towards a robust implementation of CIFT at a real caster,including the use of pickup coils and gradiometric probes,are also discussed.     

利用酵母双杂交体系筛选拟南芥ABA信号新元件

酵母双杂交体系是用活体研究蛋白质间相互作用的有效途径.利用这一体系,从拟南芥的一cDNA表达文库中筛选出了与同源框蛋白AtHB6有相互作用的两蛋白质AtHB7和AtGluRS,提示这两个蛋白有可能是脱落酸(ABA)信号传导途径中的新元件.     

一种克服电磁流量计中交直流干扰的方法

】用方波磁场和内插法不仅可以有效地消除交流磁场法电磁流量计中的变压器交流干扰电压,而且可以有效地减小直流磁场法电磁流量计中的电化学直流干扰电压及其变化的影响,从而使电磁流量计的测量精度大大提高。     

聚间—芳酰胺纤维染色的现状与展望

对聚间芳酰胺纤维的染色性能,染色机理进行了研究,通过对三种Ｎｏｍｅｘ类型纤维参数进行比较,在改善这类纺织品的上染率方面做进一步探讨。     

以更快的速度获取更好的产品：怎样实现整体开发方案？

对产品开发和制造作整体考虑,提出了在创造价值链中进行思考的要求。除了产品开发之外,三维ＣＡＤ建模方式的普遍使用使得生产准备和制造的水平有了较大提高。在已改进的快速原型成型技术、材料和后续过程的基础上,产品开发有加强转向快速制造的趋势。     

Microstructure Evolution during Friction Stir Welding of Aluminum Alloy AA2219

The characterization of microstructure evolution in friction stir welded aluminum alloy was carried out by optical microscopy (OM) and transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). The weld nugget consisted of very fine equiaxed grains and experienced dissolution of nearly half of metastable precipitates into the matrix during welding. Thermomechanically affected zone (TMAZ) also experienced dissolution of precipitates but to a lesser extent whereas coarsening of precip...     

ITMA回顾：针织

新型纬编机生产效率高、品种变换灵活，即花型和纤维原料交换快速可靠。同样减少品种变换时间来增加灵活性和机器生产范围是经编机的发展目标。