冲击地压粘滑失稳的混沌特性

为探讨冲击地压发生的非线性特征,在分析断层型或构造型冲击地压粘滑失稳的原因和特点基础上,引入了模拟粘滑失稳的双滑块模型.理论分析表明,双滑块模型在对称情况下,完全相同的2个滑块可以造成空间上不相同的滑块运动,但其动力学行为只表现出周期性的特点;在非对称的情况下,滑块的粘滑失稳表现出复杂的混沌行为.通过适当考虑模型参数物理意义以及对参数值进行选取,该模型可用于解释断层型或构造型冲击地压粘滑失稳机理,描述其动力学行为复杂的非线性混沌特性.     

棒状微细碳酸锂粉体的合成

研究了棒状微细碳酸锂粉体的制备方法,最佳的合成工艺条件为:以LiOH和CO2为原料,LiOH的质量百分浓度9%、CO2流量1L.min-1,反应温度30℃、干燥温度200℃、干燥时间2h,制得长约5μm、径约1μm、视密度为2.9g.ml-1的棒状微细碳酸锂粉体,粉体的颜色极白,均匀性和流动性较好.     

压电长棒弯曲振动模式研究

根据弯曲振动的特性,建立了压电陶瓷长棒的弯曲振动方程,给出振动解．结果表明,所建立的模型对压电棒的应用具有一定理论指导作用     

昆虫翼粘弹性特性及其本构模型

通过蜻蜓翅脉的应力松弛实验,验证了昆虫翼的粘弹性特性.并且通过数值拟合,发现可以用标准线性固体模型对其进行描述.通过理论推导,证明昆虫翼粘弹性特性对于昆虫实际高频飞行中提升翼刚度、控制变形幅度、稳定飞行起到很关键的作用.     

Mechanism of silk processing in insects and spiders

Silk spinning by insects and spiders leads to the formation of fibres that exhibit high strength and toughness. The lack of understanding of the protein processing in silk glands has prevented the recapitulation of these properties in vitro from reconstituted or genetically engineered silks. Here we report the identification of emulsion formation and micellar structures from aqueous solutions of reconstituted silkworm silk fibroin as a first step in the process to control water and protein-protein interactions. The sizes (100-200 nm diameter) of these structures could be predicted from hydrophobicity plots of silk protein primary sequence. These micelles subsequently aggregated into larger 'globules' and gel-like states as the concentration of silk fibroin increased, while maintaining solubility owing to the hydrophilic regions of the protein interspersed among the larger hydrophobic regions. Upon physical shearing or stretching structural transitions, increased birefringence and morphological alignment were demonstrated, indicating that this process mimics the behaviour of similar native silk proteins in vivo. Final morphological features of these silk materials are similar to those observed in native silkworm fibres.     

Fabrication of superhydrophobic AAO-Ag multilayer mimicking dragonfly wings

Inspired by the co-coupling of the non-smooth structure and the waxy layer inducing the hydrophobicity of dragonfly wing surface,we developed a simple and versatile method to fabricate a superhydrophobic surface with the dragonfly wing structures.In this work,Ag nanorods grew on highly ordered anodic aluminum oxide(AAO) surface via a galvanic reduction approach.Then the AAO-Ag multilayer was fabricated.Furthermore,the surface free energy of AAO-Ag multilayer was reduced by modifying with perfluorodecanethiol.The modified AAO-Ag multilayer was superhydrophobic and the static contact angle reached as high as 168°.X-ray photoelectron spectra(XPS) were used to characterize the chemical structure of the obtained products.The morphologies of AAO-Ag multilayer was similar to microstructure of dragonfly wing surface and presented hierarchical rough structure.The results showed that the co-coupling of the rough structure and low surface free energy induced the superhydrophobic performance of the AAO-Ag multilayer surface.     

棒式文丘里除尘器气液两相流阻力特性

为了掌握棒式文丘里除尘器内气液两相流的阻力特性,基于多相流理论,建立其三维CFD模型,研究分析棒间距、除尘风量和液气比对棒式文丘里除尘器阻力特性的影响,并建立了阻力预测公式以及三者之间的关系式.结果表明:文丘里棒层与下筒体的压力损失随着棒间距的减小和风量的增大呈幂指数关系增大,随着液气比的增大呈近线性增大;上筒体的压力损失与风量呈近平方关系;通过与实验数据对比,关系式最大误差为16.88%,验证了其有效性.     

碳纤维布补强和贴钢板补强在工业建筑中的应用

以上海某工业厂房结构加固为例,文章阐述了该加固工程的施工组织方法、设计计算方法,着重介绍碳纤维布补强和贴钢板补强两种加固方法的主要施工工艺,并针对易出现的质量问题,提出施工要点,为同类问题的解决提供参考.     

药用昆虫药理活性研究进展

昆虫作为防治疾病的药物,在我国已有2 000多年的历史。随着我国中医药事业的发展,药用昆虫的应用愈来愈广泛。近年的研究表明,药用昆虫具有更广泛的药理活性,在抗恶性肿瘤、免疫调节、神经性疾病、心脑血管疾病等具有独特的疗效。本研究主要综述近年来有关药用昆虫药理活性的最新研究进展,为有效利用药用昆虫资源、发掘药用昆虫新临床适应症,继承和发扬我国医药遗产提供参考。     

泰山药用昆虫的研究及应用

择要介绍了13个目、16个科、44种分布于泰山的药用昆虫的形态特征、生物学习性、药用价值,为药用昆虫的开发提供了生物学依据,使泰山昆虫资源研究得以持续发展和利用.