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141.
为提高人们在测量距离时的方便性和准确性,现介绍一种基于单片机控制的超声测距系统的构成、工作原理和硬软件设计,利用该系统及其设计方法可以作为机器人的辅助视觉系统,也可用于其他的检测系统中. 相似文献
142.
Probabilistic Visual Cryptography Schemes 总被引:1,自引:0,他引:1
143.
This study examines the presence of dental caries in a large sample of adult skeletons from the 19th century cemetery of St. Thomas' Anglican Church in Belleville, Ontario. The cemetery was used from 1821 to 1874. Caries prevalence and frequencies of diseased and missing teeth were calculated both by observing summary statistics of individual rates and by the total sample of teeth. Postmortem tooth loss is low in this sample and antemortem tooth loss is highest in first mandibular molars, all other molars and then premolars. Age at death, but not sex, was found to be significantly related to the overall Caries Rate while both age and sex were significantly associated with the Diseased-Missing Index. The increase in diseased and missing teeth in older individuals is expected while the sex difference is not explained by simple dietary factors. When compared to reports on British and American samples, caries and antemortem tooth loss in the St. Thomas' sample is most similar to a pre-1850 British group and higher than American samples. Although there is undoubtedly a complex of factors contributing to caries prevalence in this sample, more data are required from large historic samples, particularly from the American northeast and late 19th century Britain, to have a clearer understanding of the influence of diet, cultural, and environmental factors affecting caries rates in historic populations. 相似文献
144.
145.
YM Graus JJ Verschuuren NA Bos PJ van Breda Vriesman MH De Baets 《Canadian Metallurgical Quarterly》1993,43(1-2):113-124
The immunoglobulin heavy chain (VH) gene family usage in experimental autoimmune myasthenia gravis (EAMG) model was investigated by RNA slot blot hybridization using VH gene family specific probes. Anti-acetylcholine receptor (AChR) monoclonal antibodies (mAbs) isolated from susceptible C57BL/6 and resistant BALB/c mice were found to be encoded by VH genes from at least six different families. The Vgam3.8 family was overrepresented in alpha-bungarotoxin blocking mAbs. Expression of cross-reactive idiotypes by anti-AChR mAbs was irrespective of the VH gene family usage. Strain dependent differences in susceptibility for EAMG were not reflected in an aberrant VH gene family usage of anti-AChR mAbs. 相似文献
146.
147.
BM Van den Hout P Eken D Van der Linden D Wittebol-Post S Aleman A Jennekens-Schinkel YT Van der Schouw LS De Vries O Van Nieuwenhuizen 《Canadian Metallurgical Quarterly》1998,40(12):820-828
To determine predictive values of early visual and neurocognitive assessment in children with perinatally acquired haemorrhagic or ischaemic brain lesions selected on the basis of ultrasound, 63 children (37 boys, 26 girls), who had been followed and examined until the age of 18 months, were reexamined at 5 1/2 years. Good correlations between visual and neurodevelopmental assessments at 18 months and at 5 1/2 years were found. When ultrasound abnormalities were combined with early visual and neurocognitive assessment data, good predictive values, especially for the group of children who had grade 2 to 4 leukomalacia, were found for visual acuity and neurodevelopment. 相似文献
148.
C. A. Hall L. E. De Carlo M. L. Wenner N. L. Troyani 《International journal for numerical methods in engineering》1993,36(21):3617-3627
The computational method for large deformation plasticity called differential equations on a manifold (DEM) has previously been shown to be effective for axisymmetric and plane strain sheet metal forming problems. The method has now been formulated for in-plane stretching problems, incorporated into a computer code, and applied to several problems. The code's performance is robust and accurate, as evidenced by a comparison with other published results. Incorporation of an automatic mesh generator significantly reduces data preparation time. 相似文献
149.
150.
The granular ceramic materials corundum and mullite are potential filter bed materials for electrically enhanced filtration
at elevated temperatures. The dielectric response of the granular ceramics has been determined at temperatures between 420
and 920 K. It is shown that the response of these materials can be described by one equivalent circuit over the whole temperature
and frequency (0.1 Hz–10 kHz) range. Thermally activated conduction in parallel with a dipole relaxation with a symmetrical
logarithmic distribution of relaxation times (Cole-Cole relaxation) is the mechanism which determines the response at not
too low frequencies. 相似文献