碳纤维布加固超役混凝土电杆的破坏机理及力学性能

以某电网某路段超过服役期的钢筋混凝土电杆为研究对象,选取电杆杆身与跨中带钢圈接头的杆身试件各6根,其中各取3根试件采用碳纤维布（CFRP）沿杆件纵向进行加固,并对其进行抗弯承载力试验,对比研究在不同的碳纤维布黏贴层数下加固电杆的受力性能和破坏机理。基于试验实测数据,对强度及刚度计算方法进行了研究,并提出了刚度退化的数学表达式。研究结果表明：采用碳纤维布加固电杆后,其破坏表现为混凝土与碳纤维布的表面粘脱失效所致,纵向碳纤维布被拉断作为最终破坏形态,破坏过程迅速,脆性明显;试件的截面应变分布符合平截面假定。加固前杆身试件的承载力退化严重,加固后混凝土电杆的承载能力和刚度均有显著提高,但加固电杆的损伤发展较加固前提早,且快而集中,综合多方面考虑,建议在混凝土电杆接头附近的一定距离内采取双层、杆身其余部位采用单层的碳纤维布加固方法。     

豆类低聚糖的开发应用

本文对有关豆类低聚糖的分布，生理功能，分离纯化途径及食品加工性能等方面进行了分析和论述，认为豆类低聚糖是一类有利于人体健康的新型低聚糖，值得开发利用。     

The Effect of Asymmetric Heterocyclic Units on the Microstructure and the Improvement of Mechanical Properties of Three Rigid‐Rod co‐PI Fibers

Three kinds of rigid‐rod copolyimide (co‐PI) fibers are prepared by wet‐spinning of their precursor poly(amic acid)s, which are copolymerized from 3,3′,4,4′‐biphenyltetracarboxylic dianhydride (BPDA), p‐phenylenediamine (PDA), and the third asymmetric heterocyclic diamines, including 2‐(4‐aminophenyl)‐5‐aminobenzoxazole (BOA), 2‐(4‐aminophenyl)‐5‐aminobenzimidazole (PABZ), and 2,5‐bis(4‐aminophenyl)‐pyrimidine (PRM), respectively. The asymmetry is increasing in the order PRM < BOA ≈ PABZ. The introduction of asymmetric heterocyclic units results in mesomorphic order structure and decreases the size of microvoid of PI fiber, which apparently improves the toughness of PI fiber and shows positive effects on mechanical properties. The tensile strength and initial modulus of co‐PI fibers are in the ranges of 2.6–3.2 GPa and 91.8–133.5 GPa, respectively. The lowest asymmetry leads to the highest lateral order, crystal orientation, and initial modulus of BPDA/PDA/PRM co‐PI. Moreover, the introduction of asymmetric heterocyclic units can effectively improve compressive properties. BPDA/PDA/PABZ co‐PI fiber shows the highest loop strength and recoil compressive strength due to hydrogen bonding interactions. The highest orientation leads to the lowest transverse strength of BPDA/PDA/PRM co‐PI fibers, reducing the recoil compressive strength.

     

飞机管道加油系统加油过程的数值模拟

介绍了飞机管道加油系统的特点,应用排队论建立了加油过程的单队多列排队模型。设计了求解等待时间等参数的仿真算法和流程框图。采用面向事件法,用VFP语言编制了计算机软件,实现了加油过程的数值模拟。最后给出了一个实例,结果表明上述方法的正确性。     

石油库稳高压消防给水系统电动消防泵出口阀门开度调节分析

石油库由于火灾危险性高,要求其消防系统能在事故状态下快速自动投入运行,因此消防水泵出口阀必须保持一定开度。出口阀开度过大将影响消防泵电机安全,开度过小将严重影响消防泵的工作效率。文章根据理论分析及试验,证明石油库消防水泵出口阀开度设置应根据其最近用水点进行设置,事故状态下由消防值班人员根据泵的电流开大出口阀门开度。     

嘉陵成都电厂经济运行方式探讨

嘉陵成都电厂经过锅炉、汽轮机的经济运行工况优化和启停协调优化,于2005年底实现了“四炉三机”机组的经济运行方式。     

Fabrication and photocatalytic performance of one-dimensional Ag3PO4 sensitized SrTiO3 nanowire

The 1D Ag₃PO₄ sensitized SrTiO₃ nanowires are prepared by simple route of electrospinning-in situ deposition technique. The results of the thermogravimetry (TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive Spectrometer (EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–Visible diffuse reflectance spectroscopy (UV–Vis) indicate that the Ag₃PO₄ nanoparticles has been deposited on the surface of the SrTiO₃ nanowires successfully. Experimental results showed that compared with pure SrTiO₃, the as-prepared 1D Ag₃PO₄ sensitized SrTiO₃ nanowires exhibit obvious enhancement of photocatalytic performance and stability. Especially, the Ag₃PO₄/SrTiO₃ (3AS sample) had a satisfactory photocatalytic activity for degrading methylene blue (MB) more than 98% under visible light irradiation. As to pure SrTiO₃ and Ag₃PO₄, only 9.8% and 49% of MB was decomposed after 35?min irradiation respectively. Furthermore, the mechanism of the enhancing photocatalytic activity could be ascribed to the nano-heterojunction of the Ag₃PO₄/SrTiO₃, the visible light response of the Ag₃PO₄, and the 1D structure of the nanowires.     

新型高精度光纤微调装置的设计

本文介绍了新型高精度光纤微调装置的设计,通过确定最佳设计指标,使其结构更合理,成本更低廉；每一维自由度的调节在其空间上正交独立,操作方便；径向微调量可以达到0.1μm以下,具有较高调节精度。     

一种新型带轴向进气预旋调节器的离心式高炉鼓风机

介绍了一种新型的带轴向进气预旋调节器的离心式高炉鼓风机，指出了进气预旋调节具有与变速调节类似的优越性，通过应用实例说明了这两种调节方法节能效果显著，具有很高的应用推广价值。