甲基丙烯酸

The latest experimental results of the focusing perfermance of the compound high-energy X-ray lens is designed with PMMA with the parameters of 40 plano-concave elementary lenses positioned in line with axial symmetry, 200 μm radius of the concave surface, 0.15 nm working wavelength, 0.5 mm geometrical aperture and 8 mm length of the compound lens and 1.3 m focus length, are briefly introduced.

报道了这种新型X射线光学元件聚焦性能的最新实验结果。设计的高能X射线组合透镜为聚甲基丙烯酸甲酯材料，包括40个相同的、顺序排布的平凹折射单元，折射单元的球面半径为200 μm，组合透镜的几何口径约为500 μm，长度约为8 mm，焦距约为1.3 m。简要描述了PMMA材料X射线组合透镜的制作技术和制作过程。并给出了X射线组合透镜聚焦性能测试实验系统和实验条件。

The method of emulsion polymerization was used to synthesize polyvinyl acetate resin by adding hard monomer_methyl methacrylate to modify it.

本论文采用乳液聚合的方法合成了聚醋酸乙烯树脂，并通过加入硬单体―甲基丙烯酸甲酯对其进行改性。

Department of Chemistry; Huazhong University of Science and Technology; Wuhan; Post code : 430074

用红外光谱追踪表明，聚氨酯的生成快于甲基丙烯酸甲酯的聚合。

Compared with organic modifications by propyl methacrylate and vinyl groups, the octyl-modification can improve the oxygen sensing properties most efficiently.

与甲基丙烯酸丙酯基和乙烯基相比，在凝胶载体中引入辛基修饰能够最有效地改善薄膜体系的发光氧气传感性能。

In this paper,natural pyrethrum nano-capsule with a wall of the copolymer of styrene and methyl methactylate was prepared by means of microemulsion polymerization .

研究用微乳液聚合法制备以甲基丙烯酸甲酯和苯乙烯共聚体为囊壁，以天然除虫菊酯为囊芯的纳米胶囊。

The system propazine: methacrylic acid was used as a model for the preparation of molecularly imprinted fibers, and its ability to selectively rebind triazines was evaluated.

2-氯-4，6-二-1，3，5-三嗪系统：用甲基丙烯酸做模型制备分子印迹纤维，并对其选择性吸附三嗪化合物的能力进行评估。

The system propazine: methacrylic acid was used as a model for the preparation of molecularly imprinted fibers, and its ability to selectiely rebind triazines was ealuated.

2-氯-4，6-二-1，3，5-三嗪系统：用甲基丙烯酸做模型制备分子印迹纤维，并对其选择性吸附三嗪化合物的能力进行评估。

Such a strategy is based on the direct synthesis of molecularly imprinted polymeric fibers using silica capillaries as molds, with silica being etched away after polymerization. The system propazine: methacrylic acid was used as a model for the preparation of molecularly imprinted fibers, and its ability to selectively rebind triazines was evaluated.

这种技术以二氧化硅毛细管为模型直接合成分子印迹聚合纤维，聚合完成后除去二氧化硅。2-氯-4，6-二-1，3，5-三嗪系统：用甲基丙烯酸做模型制备分子印迹纤维，并对其选择性吸附三嗪化合物的能力进行评估。

Polymethyl methacrylate is the most used filling materials at present; There is not significant difference between unipedicular and bipedicular vertebroplasty; Using vertebral body venography and appropriate dense bone cement can reduce leakage of bone cement; Bolster for self-replacement can rebound vertebral body height, and balloon kyphoplasty and sky bone expander kyphoplasty can be avoided; In order to reduce refracture of vertebral body, anti-osteoporosis drugs should be used in the treatment of percutaneous vertebroplasty.

聚甲基丙烯酸甲酯是目前最常用的填充物；单侧注射和双侧注射疗效没有明显差别；应用对比剂及掌握合适的骨水泥黏稠度可以减少骨水泥的渗漏率；成形前腰部垫枕自身复位可以恢复椎体的高度，避免采用操作复杂及价格昂贵的球囊后凸成形及骨膨胀椎体后凸成形；进行经皮椎体成形时应该配合应用抗骨质疏松药物，以减少椎体再骨折的发生。

The relationship between water tree growth speed and its influence factors, such as aging time, frequency of electrical field, and relative permittivity, was studied in this paper.

按照建立的水树枝老化试验装置和方法标准，本文对低密度聚乙烯和聚甲基丙烯酸甲酯两种固体片状材料进行了水树枝老化规律的试验研究，重点研究了低密度聚乙烯材料中水树枝引发和发展的影响因素和规律，包括盐溶液的浓度对低密度聚乙烯中水树枝形态的影响，老化时间、外施电压频率、盐溶液的电容率与水树枝生长速度的关系。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。