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1 引言
小波分析是结合泛函分析、应用数学、逼近论、调和分析、广义函数论等数学知识的结晶,具有深刻的理论意义和广泛的应用范围,被称为”数学显微镜”.基于其多分辨分析的特点以及在时、频两域都具有表征信号局部特征的功能,应用它可以解决许多Fourier变换不能解决的难题,为工程应用提供了一种新的、更有效的分析工具[1],由... 相似文献
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Horseradish peroxidase catalyzed grafting of acrylamide (AM) onto Kevlar fibers has been studied. The modified fiber has been characterized with scanning electron microscopy (SEM), elemental analysis and the grafting yield. From the SEM micrographs, the surface of the grafted Kevlar fiber is rougher than that of the untreated fiber, and the elemental analysis indicated that the nitrogen content of the treated fibers is higher than that of the untreated fiber. All the results suggested that AM must have been grafted onto the Kevlar surface through HRP-mediated radical initiated grafting reaction. The probably mechanism of HRP catalyzed grafting of AM onto Kevlar surface is proposed. 相似文献
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IntroductionTheclassicalconhnuummechanicshasbeenusedtosolvemanyproblemsinmacrofracturemechanics,butencountersdifficulheswhentheeffectofITilcrocharacteristicdimensionshouldbetakenintoaccount.Thestressfieldverynearthecracktipisstillnotclear.Somephenomenaofshortcrackscannotbeexplained["']andsomemechanismoffracturehasnotbeensolvedyet.Thenon-localelashcitytheoryseemsattractivetotheseproblems.Thetheoryofnon-localelasticity,establishedanddevelopedbyEringenetal[3),connectstheclassicalcontinuummechan… 相似文献
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Huixian Yang Yanmei Guo Guoning Liu Ruowei Song Jinxi Chen Yongbing Lou Yixin Zhao 《中国化学快报》2022,33(1):537-540
Near UV highly luminescent colloidal Cs2NaBiCl6 nanocrystals(NCs) were synthesized by a simple lowcost ligand-assisted reprecipitation method. In our strategy, metal chloride precursors were added to the mixture of anti-solvent and ligand at room-temperature. The obtained Cs2NaBiCl6 NCs exhibited a bright blue emission with significantly improved photoluminescence quantum yield(PLQY) of 39.05%. The optical properties and stability were greatly enhanced... 相似文献
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借助压力测试系统,在自由场及地面布置压力传感器,分别测量了熔铸TNT、一次云爆药剂和二次云爆药剂在自由场和地面的爆炸场冲击波超压,经分析处理后拟合得到适用于3种炸药的自由场和空中爆炸超压发展公式,并计算云爆药剂的TNT当量。实验结果表明:实验选用的二次云爆药剂的自由场和地面平均TNT当量相比一次云爆药剂分别提高了60%和69%,说明二次云爆药剂比一次云爆药剂具有更大的超压作用效果;3种药剂的自由场超压峰值都比地面小10%左右,说明地面的反射效应依旧存在,在实际超压威力评估时应采用一定的修正系数。实验结果可丰富云爆药剂和传统炸药的小当量实验对比数据,为云爆药剂爆炸场参数的研究和威力评估提供参考。 相似文献
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本文揭示了单洞 Cata 型六角系统的共振多项式与广义冠的匹配多项式的关系、将1977年 Gutman 提出的方法推广应用到有洞的六角系统,并得到一些共振多项式的比较定理. 相似文献
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本文研究了一类非紧致的特殊拉格朗日子轨形的形变.通过结合一类强渐近锥形特殊拉格朗日子流形形变以及紧致的特殊拉格朗日子轨形形变理论,证明了一类非紧致特殊拉格朗日子轨形形变的模空间是一个光滑流形. 相似文献
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三维非局部弹性场中裂纹问题的分析方法 总被引:2,自引:0,他引:2
通过求解得到了三维非局部弹性力学对称情形的单位集中不连续位移基本解·基于该基本解和三维局部(经典)弹性力学的不连续位移边界积分方程———边界元方法·提出了三维非局部弹性力学中的平片裂纹Ⅰ型问题的通用解法,并给出了算例 相似文献