Properties of Soda Aluminosilicate Glasses: II, Internal Friction

Internal friction measurements of soda aluminosilicate glasses, the physical properties of which were reported in Part I of this series, are discussed. The low- and intermediate-temperature internal friction peaks were studied in detail and are shown to be due to the stress-controlled movement of the sodium and nonbridging oxygen ions, respectively. A close correlation was found between the temperature shift of the low-temperature peak and the activation energy for electrical conduction in the soda aluminosilicate glasses. The magnitude of the low-temperature peak was found to depend more on the structural environment of the sodium ions than on the actual soda content. Changes in the intermediate-temperature peak are explained on the basis of the structural model proposed for these glasses.     

DESIGNING 2 POLE AND 2/4 POLE WINDINGS BY THE SIMULATED ANNEALING METHOD

ABSTRACT

The object of the present paper is to explore the possibility of using simulated annealing procedures to determine multi-speed three phase windings. It is limited to the very simple case of p/2p polarities. The program has yielded the very well known solutions; thus, research may proceed towards more difficult problems.     

Hydration behaviour of synthetic saponite at variable relative humidity

Hydration behaviour of synthetic saponite was examined by X-ray powder diffraction simulation at various relative humidities (RH). The basal spacing of the Ca-saponite increased stepwise with increase in RH. The (00l) reflections observed reflect single or dual hydration states of smectite. Quasi-rational, intermediate, or asymmetrical reflections were observed for all XRD patterns and reflecting heterogeneity of the samples, especially along the transition between two hydration states.     

Effect of Acetylation on Composition of Phenolic Acids and Proteolysis of Rapeseed Flour

Rapeseed flour was treated with various levels of acetic anhydride to produce flours with 35, 70, and 90% of the ε-amino groups of lysine acetylated. With the extent of acetylation, free phenolic acids ranged from 86 to 35 mg/100g, phenolic acids from hydrolyzed esters ranged from 1.51 to 340 mg/100g, and no insoluble-bound phenolic acid was found. With the extent of acetylation, an increase in rapeseed flour was less susceptible to tryptic and peptic hydrolysis and an increament of water- soluble protein fragments corresponding to molecular weights of 3700–4500 and 1600–2100 daltons was observed. However, these peptides were devoid of phenolic constituents. Acetylated rapeseed flours were less susceptible to tryptic and peptic hydrolysis.     

遥感图像配准中的块效应模拟

提出和实现了一种随机遥感图像模拟新方法,该方法集成了PROSAIL模型、随机地物类别生成和尺度扩展机制,实现了随机点图像模拟和随机块图像模拟.实验中定量模拟了HJ-1 CCD传感器近红外成像光谱波段图像及具有不同平移、旋转、尺度变化影响的实验图像.利用模拟图像研究了平移、旋转、尺度变化等多种因素对近红外图像配准的影响,通过模拟地物随机分布及尺度变化的随机块图像分析了块效应在图像配准中的作用,并试验将随机模拟图像用于对图像配准算法进行适宜性分析.模拟实验结果表明图像块效应对图像配准处理具有重要影响.     

一种新的补偿硅电阻率/掺杂浓度模型(英文)

硅片或硅块的电阻率与掺杂浓度的关系模型不适用于补偿硅,如精纯冶金级硅(UMG-Si)。目前尚无合适的理论模型可以准确解释补偿硅实验和观测结果间存在的差异。基于电解液理论提出一种包含电离平衡常数的新方法,可以得到单掺杂硅的电荷载子迁移率Thurber曲线。当掺杂硅中包含一种以上掺杂物质时,需要采用数值算法来解决多重平衡系统。研究表明这类系统表现出一种缓冲溶液的特定行为。通过计算化合物的热力学参数获得平衡常数,并利用现有的电化学知识(Nerust方程和Butler-Volmer方程)提出一个普遍理论。因为硅/掺杂物系统构成一个弱电解质固溶体,电解质溶液理论为太阳能电池行为的认知提供了一个很好的物理模型和数学框架。