基于神经网络方法的碳纤维布加固混凝土梁承载力计算

杨勇新; 王敬; 岳清瑞; 张宁; 阳涛

doi:10.13204/j.gyjz200204001

基于神经网络方法的碳纤维布加固混凝土梁承载力计算

doi: 10.13204/j.gyjz200204001

基金项目:

国家重点基础研究发展计划资助项目(2004CB619105)

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- 文章访问数: 52
- HTML全文浏览量: 8
- PDF下载量: 11
- 被引次数: 0
出版历程
- 收稿日期: 2009-05-18
- 修回日期: 2009-05-18
- 刊出日期: 2002-04-20

Funds:

Supported by National Basic Research Program of China (No.2004CB619105)

摘要

摘要: 通过试验资料分析，建立了基于神经网络方法的碳纤维布加固混凝土梁受弯承载力预测的BP算法结构模型，通过模型预测值与试验结果的比较，证明了该模型的有效性和精度可以用于预测碳纤维布加固混凝土梁的受弯承载力。最后，对其影响因素进行了初步分析

Abstract: Objective To summarize the clinical features and analyze the serologic test results of latent syphilis. Methods The clinical data of 601 patients with latent syphilis who were treated in the sexually transmitted disease centre of Peking Union Medical College Hospital between January 2001 and November 2007 were retrospectively analyzed. Results Of the 601 cases of latent syphilis,there were 174 cases of early latent syphilis(EL),170 cases of late latent syphilis(LL),and 257 cases of unknown latent syphilis. Male to female ratio was 0.74:1（256 males and 345 females,respectively). Patients aged 20-39 years accounted for the largest proportion. Non-marital sexual intercourse was the main route of infection. Forty-six patients (7.65%) were co-infected with other sexually transmitted diseases. A total of 251 cases of latent syphilis (41.76%) were confirmed when the patients were receiving tests for other sexually transmitted diseases or suspected sexually transmitted diseases. Of the 601 patients with EL,LL and unknown latency,the proportion of serum rapid plasma reagin(RPR) titers higher than or equal to 8 were 72.99% (127/174),52.94% (90/170),and 60.31%(155/257),respectively. Compared with the early syphilis,serological negative conversion rate was significantly lower after treatment for l2 months in the early latent syphilis patients (P=0.044). Conclusion Education and awareness raising on syphilis should be strengthened to lower the prevalence of latent syphilis.

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参考文献(12)

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