“齿形”结构EPS材料的等效厚度及静态缓冲性能研究

为解决缓冲衬垫对产品外形不规则、不平整的适应性,研究发泡聚苯乙烯(EPS)材料“齿形”结构的静态缓冲性能。对不同个数的“齿形”结构EPS材料以及普通块状EPS材料进行静态压缩试验,并采用origin软件对应力-应变曲线进行分析,进而研究EPS材料“齿形”结构的等效厚度以及缓冲系数之间的关系。“齿形”结构EPS材料缓冲系数与“齿形”结构个数相关,“齿形”结构个数越小,“齿形”结构EPS材料缓冲系数越小。由于“齿形”结构个数越多,静态压缩试验的缓冲面积越大,该结构EPS材料缓冲能力越好,且“齿形”结构的EPS材料的静态缓冲系数与“齿形”结构个数呈现一次函数线性关系:C 1=3.67n-0.12和C2=3.89n-0.13;“齿形”结构EPS材料的等效厚度与普通块状结构的厚度同样存在一次函数线性关系:t1=45.44n-1.54和t2=47.49n-1.62。

The Morphology and Structure of GABAergic Neurons in BARREL and VPM

To understand the structure of GABAergic neurons in the VMP and ＂barrel＂, the distribution of GABAergic neurons in the two areas were studied through immunohistochemistry and Laser Scanning Confocal Microscope. The results show that the distribution of GABAergic neurons in VMP and barrel are different, and the coding of information transmission in the two areas are also dissimilar; GABAergic neurons mainly distribute among the lines asymmetrically in VMP, the somata, dendrite and axon of GABAergic neurons are restricted in the ＂barrel＂, rarely having synaptic connections with other ＂barrel＂ around. Therefore, VMP and barrel may have different roles in transmission and on processing of informatiton.

Synthesis and Crystal Structure of an Infinite 1D Zigzag Chain Compound (dimbH^+)(ClO_4^-) and Its Comparison with (dimb)2H_2O (dimb = 1,3-Di(imidazol-1-ylmethyl)-5-methylbenzene)

A new imidazolium compound, C15H17N4ClO4, was prepared from a flexible bidentate ligand of 1,3-di(imidazol-1-ylmethyl)-5-methylbenzene, and characterized by X-ray analysis. It is of orthorhombic, space group Pnma with a = 8.182(2), b = 12.874(3), c = 15.611(4) ? V = 1644.4(7) 3, Dc = 1.425 g/cm3, Z = 4, Mr = 352.78, m(MoKa) = 0.944 mm-1, F(000) = 736, S = 1.036, the final R = 0.0521 and wR = 0.1187 for 1128 observed reflections (I > 2s(I)). An infinite one-dimensional zigzag chain is formed by NH…N hydrogen bonding interactions between the imidazolium salt cations.