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基于最小均方算法的破片测速信号处理方法 被引量:2
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作者 李佳潞 赵冬娥 刘吉 《探测与控制学报》 CSCD 北大核心 2015年第4期97-100,共4页
针对激光光幕战斗部破片测速中信号噪声大的问题,提出了基于最小均方(LMS)算法的破片测速信号处理方法。该方法将变步长与变换域结合,变步长LMS算法通过合理调整步长因子有效解决了传统LMS算法收敛速度和稳态误差之间的矛盾;变换域LMS... 针对激光光幕战斗部破片测速中信号噪声大的问题,提出了基于最小均方(LMS)算法的破片测速信号处理方法。该方法将变步长与变换域结合,变步长LMS算法通过合理调整步长因子有效解决了传统LMS算法收敛速度和稳态误差之间的矛盾;变换域LMS算法通过多尺度小波变换降低输入信号矩阵相关性,提高传统LMS算法的收敛速度。仿真验证表明,新算法收敛速度加快35.04%,稳态误差改善27.12%,信噪比差值提高0.72倍,测速精度提高了0.54%。 展开更多
关键词 激光光幕 破片信号 小波变换 变步长自适应算法 速度
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高校数字化校园信息门户的设计与实现 被引量:5
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作者 程罗德 刘成安 《电脑知识与技术》 2008年第5期689-692,696,共5页
数字化校园建设是推动教育信息化的重要的系统工程,本文对数字化校园信息门户建设过程中所需要的关键技术进行了详细的阐述,论述了校园信息门户的具体工作方式以及Portlet技术的具体实现。并设计出了信息门户的总体框架、软件实现架... 数字化校园建设是推动教育信息化的重要的系统工程,本文对数字化校园信息门户建设过程中所需要的关键技术进行了详细的阐述,论述了校园信息门户的具体工作方式以及Portlet技术的具体实现。并设计出了信息门户的总体框架、软件实现架构以及内容连接。最后通过信息集成与整合给出了一种高校信息门户实现的解决方案。 展开更多
关键词 数字化校园 信息门户 门户组件 单点登陆 页面分割
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3D22—10/260—320型压缩机活塞杆断裂原因探讨
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作者 邢万坤 马殿举 +1 位作者 孙东 朱洪江 《吉林化工学院学报》 CAS 1993年第1期47-53,共7页
本文针对大型氮氢气压缩机活塞杆断裂的断口,在常规机械性能检查的基础上利用电子显微镜进行分析研究.特别是在微观检查中,证明了氢裂纹的存在.并发现了晶界腐蚀、凹坑、白斑等明显的氢脆特征.得出了断口属于疲劳性质环境断裂的结论。... 本文针对大型氮氢气压缩机活塞杆断裂的断口,在常规机械性能检查的基础上利用电子显微镜进行分析研究.特别是在微观检查中,证明了氢裂纹的存在.并发现了晶界腐蚀、凹坑、白斑等明显的氢脆特征.得出了断口属于疲劳性质环境断裂的结论。同时对初始裂纹及裂纹生成过程等方面也进行了探讨. 展开更多
关键词 压缩机 活塞杆 断裂
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A Contrastive Analysis of Three English Translation of Camel Xiangzi from the Perspective of Functional Equivalence
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作者 王凯 《International English Education Research》 2017年第2期111-114,共4页
Nida' s Functional Equivalence Theory has made a great contribution to the translation industry, which means the translation should reach the functional equivalence between two languages rather than the rigid corresp... Nida' s Functional Equivalence Theory has made a great contribution to the translation industry, which means the translation should reach the functional equivalence between two languages rather than the rigid correspondence of the texts. Functional Equivalence Theory includes stylistic equivalence, glossary equivalence and passage equivalence. The literary work selected in this paper is a famous classic novel, Camel Xiangzi, in which the features of the language employed by author are fizll of"Chinese characteristics." Just because of the characteristics, the task is more difficult in the process of the wanslating. In this paper, it makes a contrastive analysis of the translations to the fourth chapter of Camel Xiangzi by using Nida's Functional Equivalence Theory. There are three kinds of English versions, which were selected from a Chinese-American translator Shi Xiaojing's translation Camel Xiangzi, American translator Evan King' s translation Rickshaw Boy and American translator Jean M.James' s translation Richshaw: the Novel Lo-t'o Hsinang Tz~ Due to limited words, this paper mainly analyzes the novel from the glossary, the stylistic and the passage equivalence. The result is that Jean M.James' s translation maximizes to achieve Functional Equivalence Theory, it also tries to reach formal equivalence, and her Wanslafion compensates for lack of the theory. What' s more, it verifies the feasibility and directive significance in translation of functional equivalence. 展开更多
关键词 Functional Equivalence English Translation of Camel Xiangzi fragrnent
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RFLP OF HLA CLASS I GENES IN CHINESE POPULATION AND ITS CORRELATION WITH SEROLOGICALLY DEFINED ANTIGEN SPECIFICITIES
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作者 王亚新 林性玉 +4 位作者 孙婕 张来仪 陈诗书 王福庆 徐静娟 《Medical Bulletin of Shanghai Jiaotong University》 CAS 1991年第1期1-5,共5页
The restriction fragnent length polymorphisms (RFLPs) of HLA class I genes in 104 unrelated healthy Chinese individuals were analyzed with Southern blot assay. The DNAs from peripheral blood leucocytes were digested... The restriction fragnent length polymorphisms (RFLPs) of HLA class I genes in 104 unrelated healthy Chinese individuals were analyzed with Southern blot assay. The DNAs from peripheral blood leucocytes were digested with EcoRI, EcoRV and XbaI respectively, and hybridized with <sup>32</sup>P-labeled HLA class I probe ( 1.4Kb, B7 cDNA ). The results showed that 3 EcoRI fragments (13.7, 8.1 and 5.2 Kb ), 3 EcoR V fragments (11.3, 7.8 and 4.1 Kb) and 7 Xbal fragmnents (21.9, 19.2, 16.3, 6.0, 3.8, 1.8 and 1.5 Kb) were polymorphic. Ten of the fragments were found to be correlated significantly with the serologically de fined antigen specificities. The significance of this kind of correlation is discussed. 展开更多
关键词 HLA class I gene RESTRICTION fragrnent length POLYMORPHISM Chinese population
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