质量弹簧模型在外科模拟中的实现与应用

近些年来．对用于外科手术实时仿真算法的研究得到了飞速的发展。本文中作者首先简单地介绍和比较了目前得到广泛应用的两种用于模拟形变物体的建模方法。然后通过具体实例，笔者介绍了如何建立基于质量弹簧方法的模型以及模型的网格化。接着笔者给出了一个用于系统实时仿真的类静态模拟器的算法，包括如何对模型进行假设，以及用于简化计算的重要算法：QSS算法。最后笔者对本文做了总结，并展望了这种算法的应用前景。     

An investigation of X-ray and radio isotope energy absorption of heavyweight concretes containing barite

This study investigated the X-ray and radioisotope energy absorption capacity of heavyweight concrete containing barite aggregate. Concrete plates were prepared using differing amounts of barite aggregate instead of normal aggregate. Density–thickness–energy variations of these concretes for 85 keV, 118 keV, 164 keV, 662 keV and 1250 keV ray energies were recorded. It was observed that the concretes with greater barite content had a higher density and energy absorption capacity.     

SEGMENTATION OF OFF-LINE CURSIVE HANDWRITING USING LINEAR PROGRAMMING

Segmentation of cursive words into letters has been one of the major problems in handwriting recognition. We introduce a new segmentation algorithm, guided in part by the global characteristics of the handwriting. We find the successive segmentation points by evaluating a cost function at each point along the baseline. The cost of segmenting at a point is a weighted sum of four feature values at that point. The weights of the features are determined using linear programming.In our tests with 750 words written by 10 writers, 97% of the letter boundaries were correctly located.     

Inhibition of yeasts isolated from traditional Turkish cheeses by Lactobacillus spp.

Antifungal activity of some Lactobacillus strains was determined. Yeasts were isolated and identified as Saccharomyces cerevisiae (10 of 17) and one each of Candida pseudotropicalis, C. krusei, C. lipolytica, C. lusitaniae, C. ciferrii, Torulopsis glabrata and Rhodotorula rubra . Lactobacillus strains were found to have fairly strong antifungal activity against S. cerevisiae . Of the 19 bacteria tested, L. plantarum Lp 21 seemed to have the most inhibitory effect against all of the S. cerevisiae strains except for S. cerevisiae 13. We suggest that L. plantarum Lp 21 can be used with starter cultures for cheese production.