市政道路桥梁工程中沉降段路基路面施工技术分析

市政道路桥梁工程是城市建设的重要组成部分,但随着时间的延长,现有的道路桥梁逐渐出现沉降,对道路桥梁的使用带来不利影响。为提高市政道路桥梁施工质量,针对沉降路段的路基路面施工技术展开研究就成为业内关注的重点。</jats:p

Investigating neurodegeneration in the retina of tau P301L mice

Neurodegeneration is a collective term for the progressive loss of structure, function or even death of neurons. This includes diseases like Alzheimer’s disease, frontotemporal dementia, Parkinson’s disease and motor neuron disease. Recent researches have shown great interest in the role of tau proteins, which have versatile functions including microtubule stabilization and signal relay in the central nervous system. Retina and optic nerve, being part of the central nervous system, can also be affected by similar processes. In neurodegenerative diseases visual disturbances including difficulties in reading and finding object, depth perception, perceiving structure from motion, color recognition and impairment in spatial contrast sensitivity have all been observed. Some of these defects may be attributed to changes at ocular level. The effect of tau mutation was investigated in this study utilizing a transgenic P301L tau mice model. Morphometric analysis has been utilized to quatify the neurodegenerative changes, including the thickness of inner nuclear layer(INL), density of retinal ganglion cells(RGCs) and size of RGCs. Retinal sections stained by hematoxylin and eosin(H&E) were analyzed. Comparisons were made between the P301L tau mice and the control mice in addition to comparisons between different age groups. The study found that there was a significant decrease of thickness of INL of P301L tau mice when compared with control mice. The effect was more pronounced in the peripheral area and the effect increased with age. Regarding density of RGCs, P301L tau mice showed a similar age-related decline as control mice. And regarding the size of RGCs, the RGCs from P301L tau mice increased in size with age and the RGCs from control mice decreased in size with age.published_or_final_versionAnatomyMasterMaster of Medical Science

一种含丙烯酰氧基的液态超支化聚碳硅烷的制备方法

本发明提供了一种含丙烯酰氧基的液态超支化聚碳硅烷的制备方法，包括：以含Si‑H键的液态超支化聚碳硅烷和含羟基或巯基的丙烯酰氧基化合物为原料，在没有催化剂或者在金属Zn、Al、B、Sn、Cr、Co或Pd的卤化物、碱金属的氧化物、碱金属的氢氧化物、有机碱的催化下进行反应制得。本发明的制备方法简单且产物中的丙烯酰氧基含量可控，从而提高产物的陶瓷产率

纳米硅薄膜的光致发光特性

用等离子体增强化学汽相淀积法系统制备了发光纳米硅(nc-Si:H)薄膜。讨论了晶粒尺寸和表面结构对光致发光(PL)谱的影响。用量子限制-发光中心模型解释了nc-Si:H的PL。研究了PL谱的温度特性。温度从10K上升到250K，PL峰值红移了54meV，且PL强度衰减了两个数量级

一种光固化材料及其应用

本发明涉及一种光固化材料，包括如下组分：超支化聚碳硅烷60-98wt％；活性稀释剂0-35wt％；光引发剂0.1-8wt％；添加剂0-10wt％；超支化聚碳硅烷是含不饱和双键的超支化聚碳硅烷，超支化聚碳硅烷的数均分子量介于300-15000；不饱和双键为丙烯酰氧基、甲基丙烯酰氧基、乙烯基或烯丙基，超支化聚碳硅烷中不饱和双键的含量为1-30wt％。本发明还涉及光固化材料用于光固化3D打印的应用以及制备SiC构件的应用。本发明所述的光固化材料黏度较低，便于从3D打印设备的喷头中喷射出来，并且固化速度快，固化时收缩率很小

基于Grignard偶合法合成液态超支化聚碳硅烷

液态超支化聚碳硅烷(Liquid Hyperbranched Polycarbosilane,LHBPCS)作为一种纤维增强Si C陶瓷基复合材料的先驱体,因具有流动性好、可自交联、陶瓷产率高以及热解产物接近Si C化学计量比等优点而备受关注。在多种制备LHBPCS的方法中,Grignard偶合法因操作简单、中间产物不需要提纯、原料成本较低且可以采用多种原料混合的方法对LHBPCS的组成和结构进行调控以得到性能优越的Si C陶瓷先驱体而成为研究的热点和方向。论文对基于Grignard偶合法合成LHBPCS以及LHBPCS后续的交联和陶瓷化等工艺的主要研究进行综述,并展望今后的发展