Analysis of Laser Surface Hardened Layers of Automobile Engine Cylinder Liner

 The effects of rare earth (RE) on the microstructures and properties of high carbon high speed steel (HCHSS) were investigated. The results show that when suitable RE is added to the HCHSS, the effect of RE on the austenite and eutectic carbides is obvious. The austenite grain and coarse eutectic structure are refined, and flake carbides in the eutectic structures become short and fine. After heat treatment, most of the eutectic carbides are spheroidized and distributed in a uniform manner. The hardness and red hardness of modified HCHSS are slightly increased; impact toughness is greatly increased by 3781% and reaches 1017 J/cm2. The mechanism by which RE improves the structures and properties of HCHSS is also analyzed.     

淀粉-丙烯酸接枝共聚物的合成及产物结构表征

以木薯淀粉为主要原料,采用反相乳液聚合方法合成淀粉-丙烯酸接枝共聚物,通过正交设计对主要影响因素及反应条件进行研究,并用红外光谱、X射线衍射、热重分析等方法表征产物结构。实验结果显示,最佳合成工艺条件为丙烯酸:淀粉=3.5,丙烯酸中和度=83.3%,过硫酸钾和N,N-亚甲基双丙烯酰胺分别为淀粉用量的3.0%和0.3%,反应温度70℃,反应时间3 h,产物吸水率>800g/g。聚合过程中淀粉与丙烯酸发生了接枝共聚反应,并且接枝反应破坏了淀粉颗粒结晶结构,接枝产物趋于无定型结构。     

A nanosystem of copper(II)-disulfiram for cancer treatment with high efficacy and few side effects

Developing chemotherapy drugs with high efficacy and few side effects has been a bottleneck problem that requires an efficient solution. The active cancer treatment ingredient disulfiram (DSF), inspired by the copper(II) diethyldithiocarbamate complex (CuET), can be used in a one-pot synthesis method to construct a CuET delivery nanosystem (CuET-ZIF_Cu@HA). Due to the high biocompatibility, targeting of CD44 overexpressed cancer cells, and acid response of zeolitic imidazolate framework (ZIF) materials of hyaluronic acid (HA), we realized that CuET-ZIF_Cu@HA could become an effective and highly selective cancer treatment. Both in vivo and in vitro experiments have demonstrated that CuET-ZIF_Cu@HA has robust anti-tumor properties without evident side effects. This research provided a promising strategy for DSF nanosystems that involves simple preparation and high efficacy, both of which are key to reusing DSF in cancer treatment.     

输电杆塔接地新材料应用

对渭南市各地级市、县110 kV线路部分接地电阻不合格的输电杆塔进行石墨烯材料施工改造.就该地输电线路石墨烯接地新材料应用展开讨论,介绍其稳定性及耐腐蚀性,以供同行参考.     

大型注塑机拉杆卧式电镀硬铬夹具的改进

为改变大型注塑机拉杆径面镀铬层深分布不均匀状况,以及提升大型拉杆在卧镀过程中的工作效率,通过分析研究,开发了新型双导电结构的卧镀设备.对4项技术难点进行创新设计并有效组合,最终打破了大型圆杆卧镀技术瓶颈,设备实际应用4a,生产效果显著.     

pH 偏移处理对猪肝蛋白乳化特性的影响

为探究猪肝蛋白（porcine liver protein,PLP）的pH 偏移诱导重折叠改性方法与机制。猪肝蛋白溶液经pH 偏移处理（pH3～11）后再将pH 值调整到中性,经过冻干处理后再测定改性猪肝蛋白的溶解度、乳化活性与稳定性、表面疏水性、乳液粒径与Zeta 电位、活性巯基及内源荧光光谱、红外光谱。结果表明,在pH 酸性偏移条件下,PLP 的溶解度、乳化活性及乳化稳定性均有所下降,乳液粒径增大、Zeta 电位绝对值下降,而pH 碱性偏移处理会使PLP 的溶解度和乳化活性、乳化稳定性提高,乳液粒径减小、Zeta 电位绝对值上升;改性后PLP 的荧光强度及活性巯基含量降低,表明pH 偏移处理对蛋白质三级结构产生显著影响,而根据红外光谱结果显示,其对蛋白质二级结构影响较小。因此,pH 碱性偏移处理可作为提高猪肝蛋白的乳化性、溶解性等功能特性的有效手段。     

径向磁液轴承定子温升及热变形研究

提出一种新型的磁液轴承,以电磁悬浮支承为主、静压支承为辅,实现双重支承,并可以实时调控。通过建立磁液轴承的有限元分析模型,对其进行流-固-热耦合求解,得到轴承的流场、温度、应力及应变分布云图。通过调整轴承系统的结构参数（进油孔直径和线圈匝数）及运行参数（输入电流、进油流量、转子转速）分别进行有限元建模,利用ANSYS软件进行仿真分析,求解不同参数对轴承温升及定子热变形的影响规律。结果表明：流体造成的压力在进油孔内最高为1 MPa,流体在油膜处流速最高为0.8 m/s;轴承定子温度分布对称,有利于散热。研究结果为磁液轴承系统的优化设计提供理论依据。     

不同藜麦粉添加量对海绵蛋糕面糊特性及烘焙特性的影响

为提高无麸质蛋糕的品质,通过测定不同藜麦粉添加量的面糊的流变特性和密度;蛋糕的比容、烘焙损失率、色差、感官评分以及贮藏7 d后蛋糕的质构特性、水分分布和老化焓值等指标,探究藜麦粉对无麸质面糊特性及蛋糕品质的影响。结果表明,面糊的弹性模量（G′）、黏性模量（G″）和密度与藜麦粉添加量呈正相关,进而增大了蛋糕比容并降低烘焙损失率,蛋糕气孔分布更加均匀。高比例的藜麦粉（30%～50%）能有效延缓蛋糕的老化。在贮藏7 d后,对照组和50%藜麦粉老化焓值分别增加至1.42 J/g和0.92 J/g。综上,添加藜麦粉能够显著提高面糊的流变特性和蛋糕的烘焙特性,延缓蛋糕老化。综合蛋糕感官评分和老化特性,藜麦粉添加量为30%时较为适宜,可以赋予无麸质海绵蛋糕更好的品质。