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Relection of elastic waves at the elastically supported boundary of a couple stress elastic half-space
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作者 Changda Wang Xuejun Chen +1 位作者 Peijun Wei Yueqiu Li 《固体力学学报:英文版》 SCIE EI CSCD 2017年第2期154-164,共11页
The relection elastic waves at the elastically supported boundary of a couple stress elastic half-space are studied in this paper. Different from the classical elastic solid, there are three kinds of elastic waves in ... The relection elastic waves at the elastically supported boundary of a couple stress elastic half-space are studied in this paper. Different from the classical elastic solid, there are three kinds of elastic waves in the couple stress elastic solid, and two of them are dispersive. The boundary conditions of a couple stress elastic half-space include the couple stress vector and the rotation vector which disappear in the classical elastic solids. These boundary conditions are used to obtain a linear algebraic equation set, from which the amplitude ratios of relection waves to the incident wave can be determined. Then, the relection coeficients in terms of energy lux ratios are calculated numerically, and the normal energy lux conservation is used to validate the numerical results. Based on these numerical results,the inluences of the boundary parameters, which relect the mechanical behavior of elastic support, on the relection energy partition are discussed. Both the incident longitudinal wave(the P wave) and incident transverse wave(the SV wave) are considered. 展开更多
关键词 弹性半空间 边界条件 弹性支承 反射波 弹性波 偶应力 线性代数方程组 弹性固体
The effective propagation constants of SH wave in composites reinforced by dispersive parallel nanofibers
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作者 QIANG FangWei WEI PeiJun LI Li 《中国科学:物理学、力学、天文学英文版》 SCIE EI CAS 2012年第7期1172-1177,共6页
在现在的纸,橡皮的有效繁殖常数嘘,在有随机分布式的平行圆柱的 nanofibers 的 composites 的波浪被学习。表面压力效果基于在 nanofiber 之间的表面弹性理论和非古典的界面的条件被考虑,主人被导出。从在一位无限的有弹性的主人嵌... 在现在的纸,橡皮的有效繁殖常数嘘,在有随机分布式的平行圆柱的 nanofibers 的 composites 的波浪被学习。表面压力效果基于在 nanofiber 之间的表面弹性理论和非古典的界面的条件被考虑,主人被导出。从在一位无限的有弹性的主人嵌入的单个 nanofibers 的散布波浪被飞机波浪扩大方法获得。从所有纤维的散布波浪被总结获得多重散布波浪。在随机的散 nanofibers 之中的相互作用被有效领域近似考虑。有效繁殖常数被多重散布波浪的 configurational 一般水准获得。平均波浪的有效速度和变细并且联系动态有效砍 composites 的模量数字地被计算。基于数字结果,有效繁殖常数和有效模量上的 nanofibers 的尺寸效果被讨论。 展开更多
关键词 纤维增强复合材料 传播常数 平行 SH波 平面波展开方法 分散 纳米复合材料 纳米纤维
INFLUENCES OF ANISOTROPY ON BAND GAPS OF 2D PHONONIC CRYSTAL 预览 被引量:3
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作者 Zhengqiang Zhan Peijun Wei 《固体力学学报:英文版》 SCIE EI 2010年第2期181-188,共8页
Band gaps of 2D phononic crystal with orthotropic cylindrical fillers embedded in the isotropic host are studied in this paper.Two kinds of periodic structures,namely,the square lattice and the triangle lattice,are co... Band gaps of 2D phononic crystal with orthotropic cylindrical fillers embedded in the isotropic host are studied in this paper.Two kinds of periodic structures,namely,the square lattice and the triangle lattice,are considered.For anisotropic phononic crystal,band gaps not only depend on the periodic lattice but also the angle between the symmetry axis of orthotropic material and that of the periodic structure.Rotating these cylindrical fillers makes the angle changing continuously;as a result,pass bands and forbidden bands of the phononic crystal are changed.The plane wave expansion method is used to reduce the band gap problem to an eigenvalue problem.The numerical example is given for YBCO/Epoxy composites.The location and the width of band gaps are estimated for different rotating angles.The influence of anisotropy on band gaps is discussed based on numerical results. 展开更多
关键词 声子晶体 各向异性 带隙 二维 正交异性材料 三角晶格 平面波展开法 环氧复合材料
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Frequency-dependent dynamic effective properties of porous materials 预览
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作者 PeijunWei ZhupingHuang 《北京科技大学学报:英文版》 CSCD 2005年第3期 236-242,共7页
The frequency-dependent dynamic effective properties (phase velocity, attenuation and elastic modulus) of porous materials are studied numerically. The coherent plane longitudinal and shear wave equations, which are o... The frequency-dependent dynamic effective properties (phase velocity, attenuation and elastic modulus) of porous materials are studied numerically. The coherent plane longitudinal and shear wave equations, which are obtained by averaging on the multiple scattering fields, are used to evaluate the frequency-dependent dynamic effective properties of a porous material. It is found that the prediction of the dynamic effective properties includes the size effects of voids which are not included in most prediction of the traditional static effective properties. The prediction of the dynamic effective elastic modulus at a relatively low frequency range is compared with that of the traditional static effective elastic modulus, and the dynamic effective elastic modulus is found to be very close to the Hashin-Shtrikman upper bound. 展开更多
关键词 多孔渗水材料 动态分析 多次散射 弹性系数
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中草药饲料添加剂在猪生产上应用的研究进展 预览 被引量:1
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作者 丁培君 于华玲 尉玉杰 《中国饲料添加剂》 2012年第10期13-15,共3页
中草药饲料添加剂能够促进畜禽生长发育,提高生产性能,同时还能增强机体的抗病能力,且无耐药性,无毒副作用或毒副作用小等,因而越来越多的在畜牧生产中被广泛应用。本文主要阐述了中草药饲料添加剂在猪生产上应用的研究进展。
关键词 中草药 生产
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人工湿地中氨化细菌去除有机氮的效果 预览 被引量:25
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作者 李辉 徐新阳 +2 位作者 李培军 尹炜 V.A.Verkhozina 《环境工程学报》 CAS CSCD 北大核心 2008年第8期 1044-1047,共4页
人工湿地去除有机氮主要由于氨化细菌的作用。为了了解人工湿地中氨化细菌去除有机氮的效果,对人工湿地基质中5株氨化细菌进行了初步鉴定,比较了不同氨化细菌去除有机氮的效果,氨化细菌去除有机氮的量通过其生成的NH^+4-N来衡量。... 人工湿地去除有机氮主要由于氨化细菌的作用。为了了解人工湿地中氨化细菌去除有机氮的效果,对人工湿地基质中5株氨化细菌进行了初步鉴定,比较了不同氨化细菌去除有机氮的效果,氨化细菌去除有机氮的量通过其生成的NH^+4-N来衡量。结果表明,芽孢杆菌属(Bacillus)、假单胞菌属(Pseudomonas)为人工湿地中氨化细菌的优势菌属;氨化细菌-1、氨化细菌-2及氨化细菌-5对有机氮的去除效果相对较好,分别达到46.2%、49.4%和52.6%。添加沸石对去除氨氮有明显效果,从而能够提高有机氮的去除率。 展开更多
关键词 人工湿地 有机氮 氨化细菌 去除效果 基质
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