COMPLEX FORMATION AND LIQUID-LIQUID EXTRACTION OF SILVER WITH CYCLIC AND OPEN-CHAIN OXATHIA ALKANES

The complex forming and extraction properties of various open-chain and two cyclic oxathia alkanes towards silver have been studied. The investigations confirm the direct proportionality between extraction constants and related complex stability constants.The extraction of silver by open-chain oxethie alkenee is greeter than by structurally analogoue thicacrown compounds. This fact and the determined stability constants show an absence of a macrocyclic effect during complex formation. The differences of extraction power between the various open-chain compounds can be interpreted on the basic o f the coordinative saturation and stereochemiatry of the silver ion, on the size o f the poesible chelate rings, and on the complexing capability o f the ether oxygen atoms.     

羧酸型减水剂与水泥的相容性研究

选用含有亲水性羧基、酸酐基、磺酸基、聚环氧乙烷侧链的单体共聚合成了3种羧酸型减水剂,针对4种不同产地的P.O 42.5水泥,测定了在较低水灰比（mw/mc=0.29）下水泥净浆流动度及30 min经时变化,混凝土坍落度及180 min经时变化.净浆流动度30 min损失小于13.8%,混凝土坍落度60 min损失小于15%.3种羧酸型减水剂与不同水泥均具有良好的相容性.     

正负离子表面活性剂混合系统双水相的萃取作用

通过偏光实验及一定浓度双水相吸光度的测定 ,研究了 SDS/ CTAB/ H2 O/ Na Br混合系统双水相对罗丹明 B和亚甲基蓝的萃取作用。结果表明 :被萃取物的电性对分配系数有重要影响 ,阴离子双水相易萃取带正电的物质 ,阳离子双水相易萃取带负电的物质     

曲梁的单元刚度矩阵和节点荷载列阵

建筑物中预应力混凝土曲梁的应用越来越广泛，由此对圆弧形曲杆进行单元分析。本文根据结构力学基本原理导得圆弧形曲杆的单元刚度矩阵，采用相类似的方法以最一般的线性非均布集中荷载为例推得弧形曲杆的节点荷载列阵。     

M55大稠度补偿收缩砂浆配合比的设计研究及其应用

结合M55大稠度收缩砂浆在工程的应用实例,介绍了介绍利用现有材料及技术来满足高层建筑及某些特殊部位（或构件）中对大稠度补偿收缩砂浆的需要,并对配合比进行了设计,研究和分析。     

Spatially resolved positron annihilation spectroscopy on friction stir weld induced defects

A friction stir welded (FSW) Al alloy sample was investigated by Doppler broadening spectroscopy (DBS) of the positron annihilation line. The spatially resolved defect distribution showed that the material in the joint zone becomes completely annealed during the welding process at the shoulder of the FSW tool, whereas at the tip, annealing is prevailed by the deterioration of the material due to the tool movement. This might be responsible for the increased probability of cracking in the heat affected zone of friction stir welds. Examination of a material pairing of steel S235 and the Al alloy Silafont36 by coincident Doppler broadening spectroscopy (CDBS) indicates the formation of annealed steel clusters in the Al alloy component of the sample. The clear visibility of Fe in the CDB spectra is explained by the very efficient trapping at the interface between steel cluster and bulk.     

基于模糊的核医学心脏门控图像左心室边缘自动检测

提出一种自动检测心脏门控图像左心室边缘的算法. 该算法依据核医学心脏门控图像灰度分布的特点, 采用模糊增强的方法增强图像的左心室区域, 利用增强后的图像实现左心室边缘自动检测. 该算法对于左右心室分得不开的核医学心脏门控图像也能正确检测出左心室的边缘.     

Trainable blotch detection on high resolution archive films minimizing the human interaction

Film archives are continuously in need of automatic restoration tools to accelerate the correction of film artifacts and to decrease the costs. Blotches are a common type of film degradation and their correction needs a lot of manual interaction in traditional systems due to high false detection rates and the huge amount of data of high resolution images. Blotch detectors need reliable motion estimation to avoid the false detection of uncorrupted regions. In case of erroneous detection, usually an operator has to remove the false alarms manually, which significantly decreases the efficiency of the restoration process. To reduce manual intervention, we developed a two-step false alarm reduction technique including pixel- and object-based methods as post-processing. The proposed pixel-based algorithm compensates motion, decreasing false alarms at low computational cost, while the following object based method further reduces the residual false alarms by machine learning techniques. We introduced a new quality metric for detection methods by measuring the required amount of manual work after the automatic detection. In our novel evaluation technique, the ground truth is collected from digitized archive sequences where defective pixel positions are detected in an interactive process.