共查询到20条相似文献,搜索用时 46 毫秒
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基于数据结构的程序递归算法设计是当前软件设计中比较的常用的一种方法和技术。由于递归程序算法省略程序设计中的很多操作细节,大大简化程序的设计过程,而且递归程序算法的结构看起来非常清晰,并且程序的易读性也很好,最重要的是递归程序算法的正确性可以比较容易得到验证。总之,递归程序算法在程序设计中的地位非常重要。从对递归算法的介绍谈起,然后对递归算法的实现策略进行系统的分析,最后就递归算法的设计方法及其应用进行深刻的阐述。 相似文献
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本文首先提出了用极不稳定混沌系统来实现稳定的A/D变换,由于混沌系统的初值敏感性特点,使这种变换器的精度十分高,根据实验表明,这种A/D变换器精度可以按需要灵敏调节,这是一个截然不同原理下的A/D变换,是一个很有前途的新方法。 相似文献
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液体火箭发动机涡轮泵振动信号在变工况情况下表现出非平稳和强噪声特性,为特征频率分量提取带来困难。针对该问题,首先,提出二阶多重同步挤压变换(second-order multisynchrosqueezing transform, SMSST)时频分析方法,完成了数学推导并证明了其收敛性。在此基础上,提出基于自适应带通滤波与脊线提取的转频分量提取方法。用仿真信号对SMSST方法进行验证并与传统方法比较。最后,将基于SMSST的转频特征提取方法应用于发动机转速辨识和故障诊断,并用实际数据进行验证。结果表明,与传统时频分析方法相比,SMSST具有更高的时频分析精度。提出的方法可以提供有效、可靠、冗余的转速测量手段,并且该方法可以支撑故障早期预警。 相似文献
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吴伟民 《广东工业大学高等工程教育研究》2007,7(B06):156-157,161
程序设计是一种抽象严谨的工程活动,需要可视化的编程环境.可以率先在软件基础课程的编程环境实现可视化.作者研发了一系列的支持程序设计和数据结构相关课程教学的可视化软件,形成了相应的教学模式. 相似文献
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与传统的面向过程的设计方法相比,使用面向对象的设计方法可以使软件的整体结构更稳定、更清晰、更灵活、提高软件设计过程的质量。 相似文献
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本文介绍了近年来新兴的小波理论及其在电力谐波检测中的应用,同时通过MATLAB软件对分析的理论进行仿真和综合性能分析,说明小波变换对于谐波检测的优越性及广泛的应用前景。 相似文献
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本文讨论两元件冷储备系统和热储备系统。证明了如果在线工作的元件的寿命分别具有指数分布、NBU分布、NBUE分布和NBUC分布,则冷储备系统的寿命长度随机等于、随机大于、平均大于和依递增凸序大于热储备系统的寿命长度。 相似文献
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结合参数化设计和机械工程的实际,提出并深入研究了从静态草图到参数化绘图程序的自动转换问题。在建立图形转换模型的基础上,用AutoLISP编制了图形信息提取程序,用C 编制了转换程序。该转换程序能输出参数化的AutoLISP绘图程序,实现了从静态草图到参数化绘图程序的自动转换。实验结果表明:解决思路是可行的,在机械工程设计中有较大的使用价值。 相似文献
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阐述了用图形化编程语言LabVIEW对旧式圆度仪数字化改造的基本原理,并实现了轮廓检测的实时性图形显示,提出了解决仪器老化问题的一般性方法,实现了对陈旧设备简单、实用、高效的再度利用。 相似文献
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改进的Hough变换在多传感器数据融合中的应用 总被引:2,自引:0,他引:2
提出了用一种改进的Hough变换来解决多传感器数据融合的问题,与多传感器数据融合中常用的统计或几何方法相比,该方法具有计算速度快、存储要求小和容易实施等优点,简要分析了该方法和数据融合的几何方法之间内在的联系。 相似文献
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Shixi ZHAO Hanxing LIU Qiang LI Shixi OUYANG)Department of Chemistry Tsinghua University Beijing China)State Key Laboratory of Advanced Technology for Materials Synthesis Processing Wuhan University of Technology Wuhan China 《材料科学技术学报》2004,20(1):46-48
Orthorhombic LiMnO2 cathode materials were synthesized successfully at lower temperature by sol-gel method. When LiMnO2 precursor prepared by sol-gel method was fired in air, the product was a mixture of spinel structure LiMn2O4 and rock-salt structure Li2MnO3, whereas in argon single-phase orthorhombic LiMnO2 could obtain at the range of 750℃ to 920℃. The substitution of Mn by Zn2+ or Co3+ in LiMnO2 led to the structure of LiMnO2 transiting to Qα-LiFeO2. The results of electrochemical cycles indicated that the discharged capacity of orthorhombic-LiMnO2 was smaller at the initial stages, then gradually increased with the increasing of cycle number, finally the capacity stabilized to certain value after about 10th cycles. This phenomenon reveals that there is an activation process for orthorhombic LiMnO2 cathode materials during electrochemical cycles, which is a phase transition process from orthorhombic LiMnO2 to tetragonal spinel Li2Mn2O4. The capacity of orthorhombic LiMnO2 synthesized at lower te 相似文献
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系统测量了不同颗粒尺度纳米 SnO_2固体的内耗和模量,发现60℃附近存在一个内耗峰,对应的模量出现异常.烧结温度升高,峰高变化不明显,模量异常减弱.当烧结温度高于400℃时,模量曲线在-15℃附近出现异常,这种模量异常随烧结温度升高而加强,对应的内耗曲线出现一小峰.初步认为,60℃附近内耗峰和模量异常与纳米固体中的结构再有序有关,而-15℃处的模量异常为结构相变引起. 相似文献
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Theoretical Comparison,Equivalent Transformation,and Conjunction Operations of Electromagnetic Induction Generator and Triboelectric Nanogenerator for Harvesting Mechanical Energy 下载免费PDF全文
Chi Zhang Wei Tang Changbao Han Fengru Fan Zhong Lin Wang 《Advanced materials (Deerfield Beach, Fla.)》2014,26(22):3580-3591
Triboelectric nanogenerator (TENG) is a newly invented technology that is effective using conventional organic materials with functionalized surfaces for converting mechanical energy into electricity, which is light weight, cost‐effective and easy scalable. Here, we present the first systematic analysis and comparison of EMIG and TENG from their working mechanisms, governing equations and output characteristics, aiming at establishing complementary applications of the two technologies for harvesting various mechanical energies. The equivalent transformation and conjunction operations of the two power sources for the external circuit are also explored, which provide appropriate evidences that the TENG can be considered as a current source with a large internal resistance, while the EMIG is equivalent to a voltage source with a small internal resistance. The theoretical comparison and experimental validations presented in this paper establish the basis of using the TENG as a new energy technology that could be parallel or possibly equivalently important as the EMIG for general power application at large‐scale. It opens a field of organic nanogenerator for chemists and materials scientists who can be first time using conventional organic materials for converting mechanical energy into electricity at a high efficiency. 相似文献
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Based on multiphase field conception and integrated with the idea of vectorvalued phase field, a phase field model for typical allotropic transformation of solid solution is proposed. The model takes the non-uniform distribution of grain boundaries of parent phase and crystal orientation into account in proper way, as being illustrated by the simulation of austenite to ferrite transformation in low carbon steel. It is found that the misorientation dependent grain boundary mobility shows strong influence on the formation of ferrite morphology comparing with the weak effect exerted by misorientation dependent grain boundary energy. The evolution of various types of grain boundaries are quantitatively characterized in terms of its respective grain boundary energy dissipation. The simulated ferrite fraction agrees well with the expectation from phase diagram, which verifies this model. 相似文献