夹钢球钢纤维混凝土的抗侵彻试验研究

夹钢球钢纤维砼是一种新型的遮弹防护材料。抗侵彻模拟试验表明,与常规的钢筋砼比较,夹钢球钢纤维砼抗侵彻能力有了很大的提高     

鎓盐的固液相转移平衡研究(Ⅰ)——溴化四丁铵和羧酸钾的平衡常数测定

目前广泛应用的液-液相转移催化反应有两个主要的缺点:一是有一些水分子会随着离子对一起萃入有机相并在其周围形成水化膜[1,2],这不仅会降低反应速度有时还会引起种种副反应[3,4]。     

基于等效刚度的矩形孔蜂窝梁钢框架结构内力计算方法

蜂窝梁钢框架结构因梁截面沿长度周期性变化,不能直接采用普通钢框架结构矩阵位移法计算框架内力和位移．本文基于等效刚度法推导了矩形孔蜂窝梁的等效抗弯刚度、抗剪刚度和轴向刚度,建立了矩形孔蜂窝梁的单元刚度方程,提出了矩形孔蜂窝梁钢框架内力和位移计算方法．算例理论计算结果与有限元分析结果表明,两种方法计算结果非常接近．本文提出的等效刚度法概念清晰,准确性好,适用于计算蜂窝梁钢框架结构的内力和位移．     

Tamura纹理特征在水下目标分类中的应用

水下高速目标的功率谱图与非高速目标存在一定的差异性。本文介绍了Tamura纹理特征中粗糙度、对比度和方向度的计算方法。而后分别计算了非高速目标和高速目标的Tamura纹理特征量的三个特征量,通过比较发现其在对比度上存在较为明显的差异性。根据支持向量机分类结果进行了特征量选择分析研究,从分类结果来看,利用粗糙度和对比度两个特征量可以较好的分辨高速目标与非高速目标。     

Supramolecular Copolymers Under Kinetic,Thermodynamic, or Pathway-Switching Control

Supramolecular copolymers have attracted much attention due to their potential functionalities. However, the co-assembly strategies to construct co-assemblies of small molecules with well-defined sequence structures are still limited, especially for more complex crystalline block co-assemblies. Herein, we target this challenge by designing Ir^III complexes 1 and 2 , which possess unique self-assembly pathways and are capable of forming crystalline assemblies in aqueous systems. Specifically, block and random co-assemblies of 1 and 2 can be synthesized by kinetic and thermodynamic control, respectively. Meanwhile, by adjusting the water content to orthogonalize the on-pathway and the off-pathway, an unprecedented pathway-switching approach is realized to synthesize block and random co-assemblies. By coupling the kinetic pathways, the present co-assembly strategies are expected to pave the way for the synthesis of crystalline co-assemblies of small molecules and the construction of organic heterostructures.     

A Diode-Like Dye-Cu Anisotropic Junction in a Coordination Polymer as a Logic State Ratchet for Intratumor Redox Photomodulation

Redox logic materials offer new avenues to modulate intracellular pathologic redox environment area-specifically, but the unambiguity of redox logic states and their unidirectional and repetitive switchability are challenging to realize. By merging a bistable diisophthalic phenazine dye ligand with Cu^II salt, a multistable coordination polymer (CP) was constructed, of which the dye-Cu anisotropic junction achieved the diode-like unidirectional electron transfer and logic state ratchet for the first time. Radical cationic CP maintained OFF status with low toxicity in healthy tissues, but was reduced to the neutral SERVO state by the overexpressed glutathione (GSH) in hypoxic tumors. After photoirradiation, the stabilized charge-separated ON status promoted photo-Fenton reaction for reactive oxygen species (ROS) signal transduction, and simultaneously recovered the initial state for catalytic signal amplification of ROS, furnishing intratumor redox photomodulation for therapy.