Ill-conditioned problems of dam safety monitoring models and their processing methods

来源 :Science China(Technological Sciences) | 被引量 : 0次 | 上传用户:Rosa1201
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The focus of this paper is the ill-conditioned problems in the dam safety monitoring model. The reasons to give rise to the ill-conditioned problems in statistical models,deterministic models and hybrid models are analyzed in detail,and the criterions for ill-conditioned models are investigated. It is shown that safety monitoring models are not easy to be ill-conditioned if the number of influence factors is less than seven. Moreover,the models have a high accuracy and can meet the engineering requirements. Another frequently encountered problem in establishing a safety monitoring model is the existence of inflection points,which are often present in the mathematical model for the hydraulic components in deterministic models and hybrid models. The conditions for inflection points are studied and their treatments are suggested. Numerical example indicates that the treatments proposed in this paper are effective in removing the ill-conditioned problems. The focus of this paper is the ill-conditioned problems in the dam safety monitoring model. The reasons to give rise to the ill-conditioned problems in statistical models, deterministic models and hybrid models are analyzed in detail, and the criterions for ill-conditioned models are investigated. It is shown that safety monitoring models are not easy to be ill-conditioned if the number of influence factors is less than seven. Moreover, the models have a high accuracy and can meet the engineering requirements. Another frequently encountered problem in establishing a safety monitoring model is the existence of inflection points, which are often present in the mathematical model for the hydraulic components in deterministic models and hybrid models. The conditions for inflection points are studied and their treatments are suggested. proposed in this paper are effective in removing the ill-conditioned problems.
其他文献
腺苷酸激酶是一个包含三个结构域(LID结构域、NMP结构域和CORE结构域)的蛋白质分子,其主要作用是催化化学反应Mg~(2+)+ATP+AMP(?)2ADP+Mg~(2+)进而将细胞内ATP分子的浓度维持
节奏是文学作品中很重要的衔接手段,如果这种节奏的创作技巧没能翻译出来,不仅有损文学文本的主题意义,还会影响文学语言的美学效果。相比诗歌的节奏讨论,翻译界对小说节奏的
目的:探讨中枢神经系统非典型畸胎样/横纹肌样瘤(CNS AT/RT)的临床病理特征。方法:分析9例外科治疗的中枢神经系统AT/RT患者临床病理和影像学检查资料,对手术切除的肿瘤标本
2009年以来,我们济南市工商局通过组织开展“拒绝传销,建设平安校园(社区、村)”主题宣传活动,探索创新多层次、多题材、多领域的打传防传宣传方式,建立立体化的“防控宣传”
随着医学科技的快速发展,医学教学要想与国际接轨,提高医学生的整体素质,就要在课堂教学中积极开展双语教学,使学生的英语水平和医学知识水平得到全面提高,达到促进医学教学
1978年Steptoe和Edwards利用体外受精-胚胎移植技术(IVF-ET)成功治疗不孕症,诞生了世界首例试管婴儿。二十多年来,辅助生殖技术得到了不断发展。80年代试管婴儿技术主要解决
我们自 1997— 2 0 0 1年收治的黄疸病人中 ,有 2 6例最后诊断为吉尔伯 (Gilbert)综合征 ,现总结如下。1 临床资料1.1 一般资料 :所有病例均为男性患者 ,年龄 18~ 3 5岁 ,平
目的探讨微波子宫内膜去除术(MEA)治疗异常子宫出血的疗效、适应证和并发症。方法应用MEA治疗良性病变所致异常子宫出血患者168例,术前行刮宫术薄化子宫内膜,然后“Z”字形烧
以DMF为溶剂,氨基硫脲和CS2环化生成2-氨基-5-巯基-1,3,4-噻二唑;该化合物与苄氯反应,生成2-氨基-5-巯基(苯甲基)-1,3,4-噻二唑。2-氨基-5-巯基(苯甲基)-1,3,4-噻二唑与芳酰
  不孕症定义、发病率、病因学、预后、治疗目的和评价指标等背景知识见本刊 2005年第 1期第590页。1 选择性输卵管造影加输卵管插管  我们没有查阅到选择性输卵管造影